forked from Minki/linux
1ba9a89517
Change rt6_check_neigh to take a fib6_nh instead of a fib entry. Move the check on fib_flags and whether the nexthop has a gateway up to the one caller. Remove the inline from the definition as well. Not necessary. Signed-off-by: David Ahern <dsahern@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
5483 lines
134 KiB
C
5483 lines
134 KiB
C
/*
|
|
* Linux INET6 implementation
|
|
* FIB front-end.
|
|
*
|
|
* Authors:
|
|
* Pedro Roque <roque@di.fc.ul.pt>
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version
|
|
* 2 of the License, or (at your option) any later version.
|
|
*/
|
|
|
|
/* Changes:
|
|
*
|
|
* YOSHIFUJI Hideaki @USAGI
|
|
* reworked default router selection.
|
|
* - respect outgoing interface
|
|
* - select from (probably) reachable routers (i.e.
|
|
* routers in REACHABLE, STALE, DELAY or PROBE states).
|
|
* - always select the same router if it is (probably)
|
|
* reachable. otherwise, round-robin the list.
|
|
* Ville Nuorvala
|
|
* Fixed routing subtrees.
|
|
*/
|
|
|
|
#define pr_fmt(fmt) "IPv6: " fmt
|
|
|
|
#include <linux/capability.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/export.h>
|
|
#include <linux/types.h>
|
|
#include <linux/times.h>
|
|
#include <linux/socket.h>
|
|
#include <linux/sockios.h>
|
|
#include <linux/net.h>
|
|
#include <linux/route.h>
|
|
#include <linux/netdevice.h>
|
|
#include <linux/in6.h>
|
|
#include <linux/mroute6.h>
|
|
#include <linux/init.h>
|
|
#include <linux/if_arp.h>
|
|
#include <linux/proc_fs.h>
|
|
#include <linux/seq_file.h>
|
|
#include <linux/nsproxy.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/jhash.h>
|
|
#include <net/net_namespace.h>
|
|
#include <net/snmp.h>
|
|
#include <net/ipv6.h>
|
|
#include <net/ip6_fib.h>
|
|
#include <net/ip6_route.h>
|
|
#include <net/ndisc.h>
|
|
#include <net/addrconf.h>
|
|
#include <net/tcp.h>
|
|
#include <linux/rtnetlink.h>
|
|
#include <net/dst.h>
|
|
#include <net/dst_metadata.h>
|
|
#include <net/xfrm.h>
|
|
#include <net/netevent.h>
|
|
#include <net/netlink.h>
|
|
#include <net/nexthop.h>
|
|
#include <net/lwtunnel.h>
|
|
#include <net/ip_tunnels.h>
|
|
#include <net/l3mdev.h>
|
|
#include <net/ip.h>
|
|
#include <linux/uaccess.h>
|
|
|
|
#ifdef CONFIG_SYSCTL
|
|
#include <linux/sysctl.h>
|
|
#endif
|
|
|
|
static int ip6_rt_type_to_error(u8 fib6_type);
|
|
|
|
#define CREATE_TRACE_POINTS
|
|
#include <trace/events/fib6.h>
|
|
EXPORT_TRACEPOINT_SYMBOL_GPL(fib6_table_lookup);
|
|
#undef CREATE_TRACE_POINTS
|
|
|
|
enum rt6_nud_state {
|
|
RT6_NUD_FAIL_HARD = -3,
|
|
RT6_NUD_FAIL_PROBE = -2,
|
|
RT6_NUD_FAIL_DO_RR = -1,
|
|
RT6_NUD_SUCCEED = 1
|
|
};
|
|
|
|
static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie);
|
|
static unsigned int ip6_default_advmss(const struct dst_entry *dst);
|
|
static unsigned int ip6_mtu(const struct dst_entry *dst);
|
|
static struct dst_entry *ip6_negative_advice(struct dst_entry *);
|
|
static void ip6_dst_destroy(struct dst_entry *);
|
|
static void ip6_dst_ifdown(struct dst_entry *,
|
|
struct net_device *dev, int how);
|
|
static int ip6_dst_gc(struct dst_ops *ops);
|
|
|
|
static int ip6_pkt_discard(struct sk_buff *skb);
|
|
static int ip6_pkt_discard_out(struct net *net, struct sock *sk, struct sk_buff *skb);
|
|
static int ip6_pkt_prohibit(struct sk_buff *skb);
|
|
static int ip6_pkt_prohibit_out(struct net *net, struct sock *sk, struct sk_buff *skb);
|
|
static void ip6_link_failure(struct sk_buff *skb);
|
|
static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
|
|
struct sk_buff *skb, u32 mtu);
|
|
static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk,
|
|
struct sk_buff *skb);
|
|
static int rt6_score_route(struct fib6_info *rt, int oif, int strict);
|
|
static size_t rt6_nlmsg_size(struct fib6_info *rt);
|
|
static int rt6_fill_node(struct net *net, struct sk_buff *skb,
|
|
struct fib6_info *rt, struct dst_entry *dst,
|
|
struct in6_addr *dest, struct in6_addr *src,
|
|
int iif, int type, u32 portid, u32 seq,
|
|
unsigned int flags);
|
|
static struct rt6_info *rt6_find_cached_rt(struct fib6_info *rt,
|
|
struct in6_addr *daddr,
|
|
struct in6_addr *saddr);
|
|
|
|
#ifdef CONFIG_IPV6_ROUTE_INFO
|
|
static struct fib6_info *rt6_add_route_info(struct net *net,
|
|
const struct in6_addr *prefix, int prefixlen,
|
|
const struct in6_addr *gwaddr,
|
|
struct net_device *dev,
|
|
unsigned int pref);
|
|
static struct fib6_info *rt6_get_route_info(struct net *net,
|
|
const struct in6_addr *prefix, int prefixlen,
|
|
const struct in6_addr *gwaddr,
|
|
struct net_device *dev);
|
|
#endif
|
|
|
|
struct uncached_list {
|
|
spinlock_t lock;
|
|
struct list_head head;
|
|
};
|
|
|
|
static DEFINE_PER_CPU_ALIGNED(struct uncached_list, rt6_uncached_list);
|
|
|
|
void rt6_uncached_list_add(struct rt6_info *rt)
|
|
{
|
|
struct uncached_list *ul = raw_cpu_ptr(&rt6_uncached_list);
|
|
|
|
rt->rt6i_uncached_list = ul;
|
|
|
|
spin_lock_bh(&ul->lock);
|
|
list_add_tail(&rt->rt6i_uncached, &ul->head);
|
|
spin_unlock_bh(&ul->lock);
|
|
}
|
|
|
|
void rt6_uncached_list_del(struct rt6_info *rt)
|
|
{
|
|
if (!list_empty(&rt->rt6i_uncached)) {
|
|
struct uncached_list *ul = rt->rt6i_uncached_list;
|
|
struct net *net = dev_net(rt->dst.dev);
|
|
|
|
spin_lock_bh(&ul->lock);
|
|
list_del(&rt->rt6i_uncached);
|
|
atomic_dec(&net->ipv6.rt6_stats->fib_rt_uncache);
|
|
spin_unlock_bh(&ul->lock);
|
|
}
|
|
}
|
|
|
|
static void rt6_uncached_list_flush_dev(struct net *net, struct net_device *dev)
|
|
{
|
|
struct net_device *loopback_dev = net->loopback_dev;
|
|
int cpu;
|
|
|
|
if (dev == loopback_dev)
|
|
return;
|
|
|
|
for_each_possible_cpu(cpu) {
|
|
struct uncached_list *ul = per_cpu_ptr(&rt6_uncached_list, cpu);
|
|
struct rt6_info *rt;
|
|
|
|
spin_lock_bh(&ul->lock);
|
|
list_for_each_entry(rt, &ul->head, rt6i_uncached) {
|
|
struct inet6_dev *rt_idev = rt->rt6i_idev;
|
|
struct net_device *rt_dev = rt->dst.dev;
|
|
|
|
if (rt_idev->dev == dev) {
|
|
rt->rt6i_idev = in6_dev_get(loopback_dev);
|
|
in6_dev_put(rt_idev);
|
|
}
|
|
|
|
if (rt_dev == dev) {
|
|
rt->dst.dev = loopback_dev;
|
|
dev_hold(rt->dst.dev);
|
|
dev_put(rt_dev);
|
|
}
|
|
}
|
|
spin_unlock_bh(&ul->lock);
|
|
}
|
|
}
|
|
|
|
static inline const void *choose_neigh_daddr(const struct in6_addr *p,
|
|
struct sk_buff *skb,
|
|
const void *daddr)
|
|
{
|
|
if (!ipv6_addr_any(p))
|
|
return (const void *) p;
|
|
else if (skb)
|
|
return &ipv6_hdr(skb)->daddr;
|
|
return daddr;
|
|
}
|
|
|
|
struct neighbour *ip6_neigh_lookup(const struct in6_addr *gw,
|
|
struct net_device *dev,
|
|
struct sk_buff *skb,
|
|
const void *daddr)
|
|
{
|
|
struct neighbour *n;
|
|
|
|
daddr = choose_neigh_daddr(gw, skb, daddr);
|
|
n = __ipv6_neigh_lookup(dev, daddr);
|
|
if (n)
|
|
return n;
|
|
|
|
n = neigh_create(&nd_tbl, daddr, dev);
|
|
return IS_ERR(n) ? NULL : n;
|
|
}
|
|
|
|
static struct neighbour *ip6_dst_neigh_lookup(const struct dst_entry *dst,
|
|
struct sk_buff *skb,
|
|
const void *daddr)
|
|
{
|
|
const struct rt6_info *rt = container_of(dst, struct rt6_info, dst);
|
|
|
|
return ip6_neigh_lookup(&rt->rt6i_gateway, dst->dev, skb, daddr);
|
|
}
|
|
|
|
static void ip6_confirm_neigh(const struct dst_entry *dst, const void *daddr)
|
|
{
|
|
struct net_device *dev = dst->dev;
|
|
struct rt6_info *rt = (struct rt6_info *)dst;
|
|
|
|
daddr = choose_neigh_daddr(&rt->rt6i_gateway, NULL, daddr);
|
|
if (!daddr)
|
|
return;
|
|
if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
|
|
return;
|
|
if (ipv6_addr_is_multicast((const struct in6_addr *)daddr))
|
|
return;
|
|
__ipv6_confirm_neigh(dev, daddr);
|
|
}
|
|
|
|
static struct dst_ops ip6_dst_ops_template = {
|
|
.family = AF_INET6,
|
|
.gc = ip6_dst_gc,
|
|
.gc_thresh = 1024,
|
|
.check = ip6_dst_check,
|
|
.default_advmss = ip6_default_advmss,
|
|
.mtu = ip6_mtu,
|
|
.cow_metrics = dst_cow_metrics_generic,
|
|
.destroy = ip6_dst_destroy,
|
|
.ifdown = ip6_dst_ifdown,
|
|
.negative_advice = ip6_negative_advice,
|
|
.link_failure = ip6_link_failure,
|
|
.update_pmtu = ip6_rt_update_pmtu,
|
|
.redirect = rt6_do_redirect,
|
|
.local_out = __ip6_local_out,
|
|
.neigh_lookup = ip6_dst_neigh_lookup,
|
|
.confirm_neigh = ip6_confirm_neigh,
|
|
};
|
|
|
|
static unsigned int ip6_blackhole_mtu(const struct dst_entry *dst)
|
|
{
|
|
unsigned int mtu = dst_metric_raw(dst, RTAX_MTU);
|
|
|
|
return mtu ? : dst->dev->mtu;
|
|
}
|
|
|
|
static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, struct sock *sk,
|
|
struct sk_buff *skb, u32 mtu)
|
|
{
|
|
}
|
|
|
|
static void ip6_rt_blackhole_redirect(struct dst_entry *dst, struct sock *sk,
|
|
struct sk_buff *skb)
|
|
{
|
|
}
|
|
|
|
static struct dst_ops ip6_dst_blackhole_ops = {
|
|
.family = AF_INET6,
|
|
.destroy = ip6_dst_destroy,
|
|
.check = ip6_dst_check,
|
|
.mtu = ip6_blackhole_mtu,
|
|
.default_advmss = ip6_default_advmss,
|
|
.update_pmtu = ip6_rt_blackhole_update_pmtu,
|
|
.redirect = ip6_rt_blackhole_redirect,
|
|
.cow_metrics = dst_cow_metrics_generic,
|
|
.neigh_lookup = ip6_dst_neigh_lookup,
|
|
};
|
|
|
|
static const u32 ip6_template_metrics[RTAX_MAX] = {
|
|
[RTAX_HOPLIMIT - 1] = 0,
|
|
};
|
|
|
|
static const struct fib6_info fib6_null_entry_template = {
|
|
.fib6_flags = (RTF_REJECT | RTF_NONEXTHOP),
|
|
.fib6_protocol = RTPROT_KERNEL,
|
|
.fib6_metric = ~(u32)0,
|
|
.fib6_ref = ATOMIC_INIT(1),
|
|
.fib6_type = RTN_UNREACHABLE,
|
|
.fib6_metrics = (struct dst_metrics *)&dst_default_metrics,
|
|
};
|
|
|
|
static const struct rt6_info ip6_null_entry_template = {
|
|
.dst = {
|
|
.__refcnt = ATOMIC_INIT(1),
|
|
.__use = 1,
|
|
.obsolete = DST_OBSOLETE_FORCE_CHK,
|
|
.error = -ENETUNREACH,
|
|
.input = ip6_pkt_discard,
|
|
.output = ip6_pkt_discard_out,
|
|
},
|
|
.rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
|
|
};
|
|
|
|
#ifdef CONFIG_IPV6_MULTIPLE_TABLES
|
|
|
|
static const struct rt6_info ip6_prohibit_entry_template = {
|
|
.dst = {
|
|
.__refcnt = ATOMIC_INIT(1),
|
|
.__use = 1,
|
|
.obsolete = DST_OBSOLETE_FORCE_CHK,
|
|
.error = -EACCES,
|
|
.input = ip6_pkt_prohibit,
|
|
.output = ip6_pkt_prohibit_out,
|
|
},
|
|
.rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
|
|
};
|
|
|
|
static const struct rt6_info ip6_blk_hole_entry_template = {
|
|
.dst = {
|
|
.__refcnt = ATOMIC_INIT(1),
|
|
.__use = 1,
|
|
.obsolete = DST_OBSOLETE_FORCE_CHK,
|
|
.error = -EINVAL,
|
|
.input = dst_discard,
|
|
.output = dst_discard_out,
|
|
},
|
|
.rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
|
|
};
|
|
|
|
#endif
|
|
|
|
static void rt6_info_init(struct rt6_info *rt)
|
|
{
|
|
struct dst_entry *dst = &rt->dst;
|
|
|
|
memset(dst + 1, 0, sizeof(*rt) - sizeof(*dst));
|
|
INIT_LIST_HEAD(&rt->rt6i_uncached);
|
|
}
|
|
|
|
/* allocate dst with ip6_dst_ops */
|
|
struct rt6_info *ip6_dst_alloc(struct net *net, struct net_device *dev,
|
|
int flags)
|
|
{
|
|
struct rt6_info *rt = dst_alloc(&net->ipv6.ip6_dst_ops, dev,
|
|
1, DST_OBSOLETE_FORCE_CHK, flags);
|
|
|
|
if (rt) {
|
|
rt6_info_init(rt);
|
|
atomic_inc(&net->ipv6.rt6_stats->fib_rt_alloc);
|
|
}
|
|
|
|
return rt;
|
|
}
|
|
EXPORT_SYMBOL(ip6_dst_alloc);
|
|
|
|
static void ip6_dst_destroy(struct dst_entry *dst)
|
|
{
|
|
struct rt6_info *rt = (struct rt6_info *)dst;
|
|
struct fib6_info *from;
|
|
struct inet6_dev *idev;
|
|
|
|
ip_dst_metrics_put(dst);
|
|
rt6_uncached_list_del(rt);
|
|
|
|
idev = rt->rt6i_idev;
|
|
if (idev) {
|
|
rt->rt6i_idev = NULL;
|
|
in6_dev_put(idev);
|
|
}
|
|
|
|
rcu_read_lock();
|
|
from = rcu_dereference(rt->from);
|
|
rcu_assign_pointer(rt->from, NULL);
|
|
fib6_info_release(from);
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
|
|
int how)
|
|
{
|
|
struct rt6_info *rt = (struct rt6_info *)dst;
|
|
struct inet6_dev *idev = rt->rt6i_idev;
|
|
struct net_device *loopback_dev =
|
|
dev_net(dev)->loopback_dev;
|
|
|
|
if (idev && idev->dev != loopback_dev) {
|
|
struct inet6_dev *loopback_idev = in6_dev_get(loopback_dev);
|
|
if (loopback_idev) {
|
|
rt->rt6i_idev = loopback_idev;
|
|
in6_dev_put(idev);
|
|
}
|
|
}
|
|
}
|
|
|
|
static bool __rt6_check_expired(const struct rt6_info *rt)
|
|
{
|
|
if (rt->rt6i_flags & RTF_EXPIRES)
|
|
return time_after(jiffies, rt->dst.expires);
|
|
else
|
|
return false;
|
|
}
|
|
|
|
static bool rt6_check_expired(const struct rt6_info *rt)
|
|
{
|
|
struct fib6_info *from;
|
|
|
|
from = rcu_dereference(rt->from);
|
|
|
|
if (rt->rt6i_flags & RTF_EXPIRES) {
|
|
if (time_after(jiffies, rt->dst.expires))
|
|
return true;
|
|
} else if (from) {
|
|
return rt->dst.obsolete != DST_OBSOLETE_FORCE_CHK ||
|
|
fib6_check_expired(from);
|
|
}
|
|
return false;
|
|
}
|
|
|
|
struct fib6_info *fib6_multipath_select(const struct net *net,
|
|
struct fib6_info *match,
|
|
struct flowi6 *fl6, int oif,
|
|
const struct sk_buff *skb,
|
|
int strict)
|
|
{
|
|
struct fib6_info *sibling, *next_sibling;
|
|
|
|
/* We might have already computed the hash for ICMPv6 errors. In such
|
|
* case it will always be non-zero. Otherwise now is the time to do it.
|
|
*/
|
|
if (!fl6->mp_hash)
|
|
fl6->mp_hash = rt6_multipath_hash(net, fl6, skb, NULL);
|
|
|
|
if (fl6->mp_hash <= atomic_read(&match->fib6_nh.fib_nh_upper_bound))
|
|
return match;
|
|
|
|
list_for_each_entry_safe(sibling, next_sibling, &match->fib6_siblings,
|
|
fib6_siblings) {
|
|
int nh_upper_bound;
|
|
|
|
nh_upper_bound = atomic_read(&sibling->fib6_nh.fib_nh_upper_bound);
|
|
if (fl6->mp_hash > nh_upper_bound)
|
|
continue;
|
|
if (rt6_score_route(sibling, oif, strict) < 0)
|
|
break;
|
|
match = sibling;
|
|
break;
|
|
}
|
|
|
|
return match;
|
|
}
|
|
|
|
/*
|
|
* Route lookup. rcu_read_lock() should be held.
|
|
*/
|
|
|
|
static inline struct fib6_info *rt6_device_match(struct net *net,
|
|
struct fib6_info *rt,
|
|
const struct in6_addr *saddr,
|
|
int oif,
|
|
int flags)
|
|
{
|
|
struct fib6_info *sprt;
|
|
|
|
if (!oif && ipv6_addr_any(saddr) &&
|
|
!(rt->fib6_nh.fib_nh_flags & RTNH_F_DEAD))
|
|
return rt;
|
|
|
|
for (sprt = rt; sprt; sprt = rcu_dereference(sprt->fib6_next)) {
|
|
const struct net_device *dev = sprt->fib6_nh.fib_nh_dev;
|
|
|
|
if (sprt->fib6_nh.fib_nh_flags & RTNH_F_DEAD)
|
|
continue;
|
|
|
|
if (oif) {
|
|
if (dev->ifindex == oif)
|
|
return sprt;
|
|
} else {
|
|
if (ipv6_chk_addr(net, saddr, dev,
|
|
flags & RT6_LOOKUP_F_IFACE))
|
|
return sprt;
|
|
}
|
|
}
|
|
|
|
if (oif && flags & RT6_LOOKUP_F_IFACE)
|
|
return net->ipv6.fib6_null_entry;
|
|
|
|
return rt->fib6_nh.fib_nh_flags & RTNH_F_DEAD ? net->ipv6.fib6_null_entry : rt;
|
|
}
|
|
|
|
#ifdef CONFIG_IPV6_ROUTER_PREF
|
|
struct __rt6_probe_work {
|
|
struct work_struct work;
|
|
struct in6_addr target;
|
|
struct net_device *dev;
|
|
};
|
|
|
|
static void rt6_probe_deferred(struct work_struct *w)
|
|
{
|
|
struct in6_addr mcaddr;
|
|
struct __rt6_probe_work *work =
|
|
container_of(w, struct __rt6_probe_work, work);
|
|
|
|
addrconf_addr_solict_mult(&work->target, &mcaddr);
|
|
ndisc_send_ns(work->dev, &work->target, &mcaddr, NULL, 0);
|
|
dev_put(work->dev);
|
|
kfree(work);
|
|
}
|
|
|
|
static void rt6_probe(struct fib6_info *rt)
|
|
{
|
|
struct __rt6_probe_work *work = NULL;
|
|
const struct in6_addr *nh_gw;
|
|
struct neighbour *neigh;
|
|
struct net_device *dev;
|
|
struct inet6_dev *idev;
|
|
|
|
/*
|
|
* Okay, this does not seem to be appropriate
|
|
* for now, however, we need to check if it
|
|
* is really so; aka Router Reachability Probing.
|
|
*
|
|
* Router Reachability Probe MUST be rate-limited
|
|
* to no more than one per minute.
|
|
*/
|
|
if (!rt || !rt->fib6_nh.fib_nh_gw_family)
|
|
return;
|
|
|
|
nh_gw = &rt->fib6_nh.fib_nh_gw6;
|
|
dev = rt->fib6_nh.fib_nh_dev;
|
|
rcu_read_lock_bh();
|
|
idev = __in6_dev_get(dev);
|
|
neigh = __ipv6_neigh_lookup_noref(dev, nh_gw);
|
|
if (neigh) {
|
|
if (neigh->nud_state & NUD_VALID)
|
|
goto out;
|
|
|
|
write_lock(&neigh->lock);
|
|
if (!(neigh->nud_state & NUD_VALID) &&
|
|
time_after(jiffies,
|
|
neigh->updated + idev->cnf.rtr_probe_interval)) {
|
|
work = kmalloc(sizeof(*work), GFP_ATOMIC);
|
|
if (work)
|
|
__neigh_set_probe_once(neigh);
|
|
}
|
|
write_unlock(&neigh->lock);
|
|
} else if (time_after(jiffies, rt->last_probe +
|
|
idev->cnf.rtr_probe_interval)) {
|
|
work = kmalloc(sizeof(*work), GFP_ATOMIC);
|
|
}
|
|
|
|
if (work) {
|
|
rt->last_probe = jiffies;
|
|
INIT_WORK(&work->work, rt6_probe_deferred);
|
|
work->target = *nh_gw;
|
|
dev_hold(dev);
|
|
work->dev = dev;
|
|
schedule_work(&work->work);
|
|
}
|
|
|
|
out:
|
|
rcu_read_unlock_bh();
|
|
}
|
|
#else
|
|
static inline void rt6_probe(struct fib6_info *rt)
|
|
{
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Default Router Selection (RFC 2461 6.3.6)
|
|
*/
|
|
static inline int rt6_check_dev(struct fib6_info *rt, int oif)
|
|
{
|
|
const struct net_device *dev = rt->fib6_nh.fib_nh_dev;
|
|
|
|
if (!oif || dev->ifindex == oif)
|
|
return 2;
|
|
return 0;
|
|
}
|
|
|
|
static enum rt6_nud_state rt6_check_neigh(const struct fib6_nh *fib6_nh)
|
|
{
|
|
enum rt6_nud_state ret = RT6_NUD_FAIL_HARD;
|
|
struct neighbour *neigh;
|
|
|
|
rcu_read_lock_bh();
|
|
neigh = __ipv6_neigh_lookup_noref(fib6_nh->fib_nh_dev,
|
|
&fib6_nh->fib_nh_gw6);
|
|
if (neigh) {
|
|
read_lock(&neigh->lock);
|
|
if (neigh->nud_state & NUD_VALID)
|
|
ret = RT6_NUD_SUCCEED;
|
|
#ifdef CONFIG_IPV6_ROUTER_PREF
|
|
else if (!(neigh->nud_state & NUD_FAILED))
|
|
ret = RT6_NUD_SUCCEED;
|
|
else
|
|
ret = RT6_NUD_FAIL_PROBE;
|
|
#endif
|
|
read_unlock(&neigh->lock);
|
|
} else {
|
|
ret = IS_ENABLED(CONFIG_IPV6_ROUTER_PREF) ?
|
|
RT6_NUD_SUCCEED : RT6_NUD_FAIL_DO_RR;
|
|
}
|
|
rcu_read_unlock_bh();
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int rt6_score_route(struct fib6_info *rt, int oif, int strict)
|
|
{
|
|
struct fib6_nh *nh = &rt->fib6_nh;
|
|
int m;
|
|
|
|
m = rt6_check_dev(rt, oif);
|
|
if (!m && (strict & RT6_LOOKUP_F_IFACE))
|
|
return RT6_NUD_FAIL_HARD;
|
|
#ifdef CONFIG_IPV6_ROUTER_PREF
|
|
m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->fib6_flags)) << 2;
|
|
#endif
|
|
if ((strict & RT6_LOOKUP_F_REACHABLE) &&
|
|
!(rt->fib6_flags & RTF_NONEXTHOP) && nh->fib_nh_gw_family) {
|
|
int n = rt6_check_neigh(nh);
|
|
if (n < 0)
|
|
return n;
|
|
}
|
|
return m;
|
|
}
|
|
|
|
static struct fib6_info *find_match(struct fib6_info *rt, int oif, int strict,
|
|
int *mpri, struct fib6_info *match,
|
|
bool *do_rr)
|
|
{
|
|
int m;
|
|
bool match_do_rr = false;
|
|
|
|
if (rt->fib6_nh.fib_nh_flags & RTNH_F_DEAD)
|
|
goto out;
|
|
|
|
if (ip6_ignore_linkdown(rt->fib6_nh.fib_nh_dev) &&
|
|
rt->fib6_nh.fib_nh_flags & RTNH_F_LINKDOWN &&
|
|
!(strict & RT6_LOOKUP_F_IGNORE_LINKSTATE))
|
|
goto out;
|
|
|
|
if (fib6_check_expired(rt))
|
|
goto out;
|
|
|
|
m = rt6_score_route(rt, oif, strict);
|
|
if (m == RT6_NUD_FAIL_DO_RR) {
|
|
match_do_rr = true;
|
|
m = 0; /* lowest valid score */
|
|
} else if (m == RT6_NUD_FAIL_HARD) {
|
|
goto out;
|
|
}
|
|
|
|
if (strict & RT6_LOOKUP_F_REACHABLE)
|
|
rt6_probe(rt);
|
|
|
|
/* note that m can be RT6_NUD_FAIL_PROBE at this point */
|
|
if (m > *mpri) {
|
|
*do_rr = match_do_rr;
|
|
*mpri = m;
|
|
match = rt;
|
|
}
|
|
out:
|
|
return match;
|
|
}
|
|
|
|
static struct fib6_info *find_rr_leaf(struct fib6_node *fn,
|
|
struct fib6_info *leaf,
|
|
struct fib6_info *rr_head,
|
|
u32 metric, int oif, int strict,
|
|
bool *do_rr)
|
|
{
|
|
struct fib6_info *rt, *match, *cont;
|
|
int mpri = -1;
|
|
|
|
match = NULL;
|
|
cont = NULL;
|
|
for (rt = rr_head; rt; rt = rcu_dereference(rt->fib6_next)) {
|
|
if (rt->fib6_metric != metric) {
|
|
cont = rt;
|
|
break;
|
|
}
|
|
|
|
match = find_match(rt, oif, strict, &mpri, match, do_rr);
|
|
}
|
|
|
|
for (rt = leaf; rt && rt != rr_head;
|
|
rt = rcu_dereference(rt->fib6_next)) {
|
|
if (rt->fib6_metric != metric) {
|
|
cont = rt;
|
|
break;
|
|
}
|
|
|
|
match = find_match(rt, oif, strict, &mpri, match, do_rr);
|
|
}
|
|
|
|
if (match || !cont)
|
|
return match;
|
|
|
|
for (rt = cont; rt; rt = rcu_dereference(rt->fib6_next))
|
|
match = find_match(rt, oif, strict, &mpri, match, do_rr);
|
|
|
|
return match;
|
|
}
|
|
|
|
static struct fib6_info *rt6_select(struct net *net, struct fib6_node *fn,
|
|
int oif, int strict)
|
|
{
|
|
struct fib6_info *leaf = rcu_dereference(fn->leaf);
|
|
struct fib6_info *match, *rt0;
|
|
bool do_rr = false;
|
|
int key_plen;
|
|
|
|
if (!leaf || leaf == net->ipv6.fib6_null_entry)
|
|
return net->ipv6.fib6_null_entry;
|
|
|
|
rt0 = rcu_dereference(fn->rr_ptr);
|
|
if (!rt0)
|
|
rt0 = leaf;
|
|
|
|
/* Double check to make sure fn is not an intermediate node
|
|
* and fn->leaf does not points to its child's leaf
|
|
* (This might happen if all routes under fn are deleted from
|
|
* the tree and fib6_repair_tree() is called on the node.)
|
|
*/
|
|
key_plen = rt0->fib6_dst.plen;
|
|
#ifdef CONFIG_IPV6_SUBTREES
|
|
if (rt0->fib6_src.plen)
|
|
key_plen = rt0->fib6_src.plen;
|
|
#endif
|
|
if (fn->fn_bit != key_plen)
|
|
return net->ipv6.fib6_null_entry;
|
|
|
|
match = find_rr_leaf(fn, leaf, rt0, rt0->fib6_metric, oif, strict,
|
|
&do_rr);
|
|
|
|
if (do_rr) {
|
|
struct fib6_info *next = rcu_dereference(rt0->fib6_next);
|
|
|
|
/* no entries matched; do round-robin */
|
|
if (!next || next->fib6_metric != rt0->fib6_metric)
|
|
next = leaf;
|
|
|
|
if (next != rt0) {
|
|
spin_lock_bh(&leaf->fib6_table->tb6_lock);
|
|
/* make sure next is not being deleted from the tree */
|
|
if (next->fib6_node)
|
|
rcu_assign_pointer(fn->rr_ptr, next);
|
|
spin_unlock_bh(&leaf->fib6_table->tb6_lock);
|
|
}
|
|
}
|
|
|
|
return match ? match : net->ipv6.fib6_null_entry;
|
|
}
|
|
|
|
static bool rt6_is_gw_or_nonexthop(const struct fib6_info *rt)
|
|
{
|
|
return (rt->fib6_flags & RTF_NONEXTHOP) || rt->fib6_nh.fib_nh_gw_family;
|
|
}
|
|
|
|
#ifdef CONFIG_IPV6_ROUTE_INFO
|
|
int rt6_route_rcv(struct net_device *dev, u8 *opt, int len,
|
|
const struct in6_addr *gwaddr)
|
|
{
|
|
struct net *net = dev_net(dev);
|
|
struct route_info *rinfo = (struct route_info *) opt;
|
|
struct in6_addr prefix_buf, *prefix;
|
|
unsigned int pref;
|
|
unsigned long lifetime;
|
|
struct fib6_info *rt;
|
|
|
|
if (len < sizeof(struct route_info)) {
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* Sanity check for prefix_len and length */
|
|
if (rinfo->length > 3) {
|
|
return -EINVAL;
|
|
} else if (rinfo->prefix_len > 128) {
|
|
return -EINVAL;
|
|
} else if (rinfo->prefix_len > 64) {
|
|
if (rinfo->length < 2) {
|
|
return -EINVAL;
|
|
}
|
|
} else if (rinfo->prefix_len > 0) {
|
|
if (rinfo->length < 1) {
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
pref = rinfo->route_pref;
|
|
if (pref == ICMPV6_ROUTER_PREF_INVALID)
|
|
return -EINVAL;
|
|
|
|
lifetime = addrconf_timeout_fixup(ntohl(rinfo->lifetime), HZ);
|
|
|
|
if (rinfo->length == 3)
|
|
prefix = (struct in6_addr *)rinfo->prefix;
|
|
else {
|
|
/* this function is safe */
|
|
ipv6_addr_prefix(&prefix_buf,
|
|
(struct in6_addr *)rinfo->prefix,
|
|
rinfo->prefix_len);
|
|
prefix = &prefix_buf;
|
|
}
|
|
|
|
if (rinfo->prefix_len == 0)
|
|
rt = rt6_get_dflt_router(net, gwaddr, dev);
|
|
else
|
|
rt = rt6_get_route_info(net, prefix, rinfo->prefix_len,
|
|
gwaddr, dev);
|
|
|
|
if (rt && !lifetime) {
|
|
ip6_del_rt(net, rt);
|
|
rt = NULL;
|
|
}
|
|
|
|
if (!rt && lifetime)
|
|
rt = rt6_add_route_info(net, prefix, rinfo->prefix_len, gwaddr,
|
|
dev, pref);
|
|
else if (rt)
|
|
rt->fib6_flags = RTF_ROUTEINFO |
|
|
(rt->fib6_flags & ~RTF_PREF_MASK) | RTF_PREF(pref);
|
|
|
|
if (rt) {
|
|
if (!addrconf_finite_timeout(lifetime))
|
|
fib6_clean_expires(rt);
|
|
else
|
|
fib6_set_expires(rt, jiffies + HZ * lifetime);
|
|
|
|
fib6_info_release(rt);
|
|
}
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Misc support functions
|
|
*/
|
|
|
|
/* called with rcu_lock held */
|
|
static struct net_device *ip6_rt_get_dev_rcu(struct fib6_info *rt)
|
|
{
|
|
struct net_device *dev = rt->fib6_nh.fib_nh_dev;
|
|
|
|
if (rt->fib6_flags & (RTF_LOCAL | RTF_ANYCAST)) {
|
|
/* for copies of local routes, dst->dev needs to be the
|
|
* device if it is a master device, the master device if
|
|
* device is enslaved, and the loopback as the default
|
|
*/
|
|
if (netif_is_l3_slave(dev) &&
|
|
!rt6_need_strict(&rt->fib6_dst.addr))
|
|
dev = l3mdev_master_dev_rcu(dev);
|
|
else if (!netif_is_l3_master(dev))
|
|
dev = dev_net(dev)->loopback_dev;
|
|
/* last case is netif_is_l3_master(dev) is true in which
|
|
* case we want dev returned to be dev
|
|
*/
|
|
}
|
|
|
|
return dev;
|
|
}
|
|
|
|
static const int fib6_prop[RTN_MAX + 1] = {
|
|
[RTN_UNSPEC] = 0,
|
|
[RTN_UNICAST] = 0,
|
|
[RTN_LOCAL] = 0,
|
|
[RTN_BROADCAST] = 0,
|
|
[RTN_ANYCAST] = 0,
|
|
[RTN_MULTICAST] = 0,
|
|
[RTN_BLACKHOLE] = -EINVAL,
|
|
[RTN_UNREACHABLE] = -EHOSTUNREACH,
|
|
[RTN_PROHIBIT] = -EACCES,
|
|
[RTN_THROW] = -EAGAIN,
|
|
[RTN_NAT] = -EINVAL,
|
|
[RTN_XRESOLVE] = -EINVAL,
|
|
};
|
|
|
|
static int ip6_rt_type_to_error(u8 fib6_type)
|
|
{
|
|
return fib6_prop[fib6_type];
|
|
}
|
|
|
|
static unsigned short fib6_info_dst_flags(struct fib6_info *rt)
|
|
{
|
|
unsigned short flags = 0;
|
|
|
|
if (rt->dst_nocount)
|
|
flags |= DST_NOCOUNT;
|
|
if (rt->dst_nopolicy)
|
|
flags |= DST_NOPOLICY;
|
|
if (rt->dst_host)
|
|
flags |= DST_HOST;
|
|
|
|
return flags;
|
|
}
|
|
|
|
static void ip6_rt_init_dst_reject(struct rt6_info *rt, struct fib6_info *ort)
|
|
{
|
|
rt->dst.error = ip6_rt_type_to_error(ort->fib6_type);
|
|
|
|
switch (ort->fib6_type) {
|
|
case RTN_BLACKHOLE:
|
|
rt->dst.output = dst_discard_out;
|
|
rt->dst.input = dst_discard;
|
|
break;
|
|
case RTN_PROHIBIT:
|
|
rt->dst.output = ip6_pkt_prohibit_out;
|
|
rt->dst.input = ip6_pkt_prohibit;
|
|
break;
|
|
case RTN_THROW:
|
|
case RTN_UNREACHABLE:
|
|
default:
|
|
rt->dst.output = ip6_pkt_discard_out;
|
|
rt->dst.input = ip6_pkt_discard;
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void ip6_rt_init_dst(struct rt6_info *rt, struct fib6_info *ort)
|
|
{
|
|
if (ort->fib6_flags & RTF_REJECT) {
|
|
ip6_rt_init_dst_reject(rt, ort);
|
|
return;
|
|
}
|
|
|
|
rt->dst.error = 0;
|
|
rt->dst.output = ip6_output;
|
|
|
|
if (ort->fib6_type == RTN_LOCAL || ort->fib6_type == RTN_ANYCAST) {
|
|
rt->dst.input = ip6_input;
|
|
} else if (ipv6_addr_type(&ort->fib6_dst.addr) & IPV6_ADDR_MULTICAST) {
|
|
rt->dst.input = ip6_mc_input;
|
|
} else {
|
|
rt->dst.input = ip6_forward;
|
|
}
|
|
|
|
if (ort->fib6_nh.fib_nh_lws) {
|
|
rt->dst.lwtstate = lwtstate_get(ort->fib6_nh.fib_nh_lws);
|
|
lwtunnel_set_redirect(&rt->dst);
|
|
}
|
|
|
|
rt->dst.lastuse = jiffies;
|
|
}
|
|
|
|
/* Caller must already hold reference to @from */
|
|
static void rt6_set_from(struct rt6_info *rt, struct fib6_info *from)
|
|
{
|
|
rt->rt6i_flags &= ~RTF_EXPIRES;
|
|
rcu_assign_pointer(rt->from, from);
|
|
ip_dst_init_metrics(&rt->dst, from->fib6_metrics);
|
|
}
|
|
|
|
/* Caller must already hold reference to @ort */
|
|
static void ip6_rt_copy_init(struct rt6_info *rt, struct fib6_info *ort)
|
|
{
|
|
struct net_device *dev = fib6_info_nh_dev(ort);
|
|
|
|
ip6_rt_init_dst(rt, ort);
|
|
|
|
rt->rt6i_dst = ort->fib6_dst;
|
|
rt->rt6i_idev = dev ? in6_dev_get(dev) : NULL;
|
|
rt->rt6i_flags = ort->fib6_flags;
|
|
if (ort->fib6_nh.fib_nh_gw_family) {
|
|
rt->rt6i_gateway = ort->fib6_nh.fib_nh_gw6;
|
|
rt->rt6i_flags |= RTF_GATEWAY;
|
|
}
|
|
rt6_set_from(rt, ort);
|
|
#ifdef CONFIG_IPV6_SUBTREES
|
|
rt->rt6i_src = ort->fib6_src;
|
|
#endif
|
|
}
|
|
|
|
static struct fib6_node* fib6_backtrack(struct fib6_node *fn,
|
|
struct in6_addr *saddr)
|
|
{
|
|
struct fib6_node *pn, *sn;
|
|
while (1) {
|
|
if (fn->fn_flags & RTN_TL_ROOT)
|
|
return NULL;
|
|
pn = rcu_dereference(fn->parent);
|
|
sn = FIB6_SUBTREE(pn);
|
|
if (sn && sn != fn)
|
|
fn = fib6_node_lookup(sn, NULL, saddr);
|
|
else
|
|
fn = pn;
|
|
if (fn->fn_flags & RTN_RTINFO)
|
|
return fn;
|
|
}
|
|
}
|
|
|
|
static bool ip6_hold_safe(struct net *net, struct rt6_info **prt)
|
|
{
|
|
struct rt6_info *rt = *prt;
|
|
|
|
if (dst_hold_safe(&rt->dst))
|
|
return true;
|
|
if (net) {
|
|
rt = net->ipv6.ip6_null_entry;
|
|
dst_hold(&rt->dst);
|
|
} else {
|
|
rt = NULL;
|
|
}
|
|
*prt = rt;
|
|
return false;
|
|
}
|
|
|
|
/* called with rcu_lock held */
|
|
static struct rt6_info *ip6_create_rt_rcu(struct fib6_info *rt)
|
|
{
|
|
unsigned short flags = fib6_info_dst_flags(rt);
|
|
struct net_device *dev = rt->fib6_nh.fib_nh_dev;
|
|
struct rt6_info *nrt;
|
|
|
|
if (!fib6_info_hold_safe(rt))
|
|
goto fallback;
|
|
|
|
nrt = ip6_dst_alloc(dev_net(dev), dev, flags);
|
|
if (!nrt) {
|
|
fib6_info_release(rt);
|
|
goto fallback;
|
|
}
|
|
|
|
ip6_rt_copy_init(nrt, rt);
|
|
return nrt;
|
|
|
|
fallback:
|
|
nrt = dev_net(dev)->ipv6.ip6_null_entry;
|
|
dst_hold(&nrt->dst);
|
|
return nrt;
|
|
}
|
|
|
|
static struct rt6_info *ip6_pol_route_lookup(struct net *net,
|
|
struct fib6_table *table,
|
|
struct flowi6 *fl6,
|
|
const struct sk_buff *skb,
|
|
int flags)
|
|
{
|
|
struct fib6_info *f6i;
|
|
struct fib6_node *fn;
|
|
struct rt6_info *rt;
|
|
|
|
if (fl6->flowi6_flags & FLOWI_FLAG_SKIP_NH_OIF)
|
|
flags &= ~RT6_LOOKUP_F_IFACE;
|
|
|
|
rcu_read_lock();
|
|
fn = fib6_node_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
|
|
restart:
|
|
f6i = rcu_dereference(fn->leaf);
|
|
if (!f6i) {
|
|
f6i = net->ipv6.fib6_null_entry;
|
|
} else {
|
|
f6i = rt6_device_match(net, f6i, &fl6->saddr,
|
|
fl6->flowi6_oif, flags);
|
|
if (f6i->fib6_nsiblings && fl6->flowi6_oif == 0)
|
|
f6i = fib6_multipath_select(net, f6i, fl6,
|
|
fl6->flowi6_oif, skb,
|
|
flags);
|
|
}
|
|
if (f6i == net->ipv6.fib6_null_entry) {
|
|
fn = fib6_backtrack(fn, &fl6->saddr);
|
|
if (fn)
|
|
goto restart;
|
|
}
|
|
|
|
trace_fib6_table_lookup(net, f6i, table, fl6);
|
|
|
|
/* Search through exception table */
|
|
rt = rt6_find_cached_rt(f6i, &fl6->daddr, &fl6->saddr);
|
|
if (rt) {
|
|
if (ip6_hold_safe(net, &rt))
|
|
dst_use_noref(&rt->dst, jiffies);
|
|
} else if (f6i == net->ipv6.fib6_null_entry) {
|
|
rt = net->ipv6.ip6_null_entry;
|
|
dst_hold(&rt->dst);
|
|
} else {
|
|
rt = ip6_create_rt_rcu(f6i);
|
|
}
|
|
|
|
rcu_read_unlock();
|
|
|
|
return rt;
|
|
}
|
|
|
|
struct dst_entry *ip6_route_lookup(struct net *net, struct flowi6 *fl6,
|
|
const struct sk_buff *skb, int flags)
|
|
{
|
|
return fib6_rule_lookup(net, fl6, skb, flags, ip6_pol_route_lookup);
|
|
}
|
|
EXPORT_SYMBOL_GPL(ip6_route_lookup);
|
|
|
|
struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr,
|
|
const struct in6_addr *saddr, int oif,
|
|
const struct sk_buff *skb, int strict)
|
|
{
|
|
struct flowi6 fl6 = {
|
|
.flowi6_oif = oif,
|
|
.daddr = *daddr,
|
|
};
|
|
struct dst_entry *dst;
|
|
int flags = strict ? RT6_LOOKUP_F_IFACE : 0;
|
|
|
|
if (saddr) {
|
|
memcpy(&fl6.saddr, saddr, sizeof(*saddr));
|
|
flags |= RT6_LOOKUP_F_HAS_SADDR;
|
|
}
|
|
|
|
dst = fib6_rule_lookup(net, &fl6, skb, flags, ip6_pol_route_lookup);
|
|
if (dst->error == 0)
|
|
return (struct rt6_info *) dst;
|
|
|
|
dst_release(dst);
|
|
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL(rt6_lookup);
|
|
|
|
/* ip6_ins_rt is called with FREE table->tb6_lock.
|
|
* It takes new route entry, the addition fails by any reason the
|
|
* route is released.
|
|
* Caller must hold dst before calling it.
|
|
*/
|
|
|
|
static int __ip6_ins_rt(struct fib6_info *rt, struct nl_info *info,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
int err;
|
|
struct fib6_table *table;
|
|
|
|
table = rt->fib6_table;
|
|
spin_lock_bh(&table->tb6_lock);
|
|
err = fib6_add(&table->tb6_root, rt, info, extack);
|
|
spin_unlock_bh(&table->tb6_lock);
|
|
|
|
return err;
|
|
}
|
|
|
|
int ip6_ins_rt(struct net *net, struct fib6_info *rt)
|
|
{
|
|
struct nl_info info = { .nl_net = net, };
|
|
|
|
return __ip6_ins_rt(rt, &info, NULL);
|
|
}
|
|
|
|
static struct rt6_info *ip6_rt_cache_alloc(struct fib6_info *ort,
|
|
const struct in6_addr *daddr,
|
|
const struct in6_addr *saddr)
|
|
{
|
|
struct net_device *dev;
|
|
struct rt6_info *rt;
|
|
|
|
/*
|
|
* Clone the route.
|
|
*/
|
|
|
|
if (!fib6_info_hold_safe(ort))
|
|
return NULL;
|
|
|
|
dev = ip6_rt_get_dev_rcu(ort);
|
|
rt = ip6_dst_alloc(dev_net(dev), dev, 0);
|
|
if (!rt) {
|
|
fib6_info_release(ort);
|
|
return NULL;
|
|
}
|
|
|
|
ip6_rt_copy_init(rt, ort);
|
|
rt->rt6i_flags |= RTF_CACHE;
|
|
rt->dst.flags |= DST_HOST;
|
|
rt->rt6i_dst.addr = *daddr;
|
|
rt->rt6i_dst.plen = 128;
|
|
|
|
if (!rt6_is_gw_or_nonexthop(ort)) {
|
|
if (ort->fib6_dst.plen != 128 &&
|
|
ipv6_addr_equal(&ort->fib6_dst.addr, daddr))
|
|
rt->rt6i_flags |= RTF_ANYCAST;
|
|
#ifdef CONFIG_IPV6_SUBTREES
|
|
if (rt->rt6i_src.plen && saddr) {
|
|
rt->rt6i_src.addr = *saddr;
|
|
rt->rt6i_src.plen = 128;
|
|
}
|
|
#endif
|
|
}
|
|
|
|
return rt;
|
|
}
|
|
|
|
static struct rt6_info *ip6_rt_pcpu_alloc(struct fib6_info *rt)
|
|
{
|
|
unsigned short flags = fib6_info_dst_flags(rt);
|
|
struct net_device *dev;
|
|
struct rt6_info *pcpu_rt;
|
|
|
|
if (!fib6_info_hold_safe(rt))
|
|
return NULL;
|
|
|
|
rcu_read_lock();
|
|
dev = ip6_rt_get_dev_rcu(rt);
|
|
pcpu_rt = ip6_dst_alloc(dev_net(dev), dev, flags);
|
|
rcu_read_unlock();
|
|
if (!pcpu_rt) {
|
|
fib6_info_release(rt);
|
|
return NULL;
|
|
}
|
|
ip6_rt_copy_init(pcpu_rt, rt);
|
|
pcpu_rt->rt6i_flags |= RTF_PCPU;
|
|
return pcpu_rt;
|
|
}
|
|
|
|
/* It should be called with rcu_read_lock() acquired */
|
|
static struct rt6_info *rt6_get_pcpu_route(struct fib6_info *rt)
|
|
{
|
|
struct rt6_info *pcpu_rt, **p;
|
|
|
|
p = this_cpu_ptr(rt->rt6i_pcpu);
|
|
pcpu_rt = *p;
|
|
|
|
if (pcpu_rt)
|
|
ip6_hold_safe(NULL, &pcpu_rt);
|
|
|
|
return pcpu_rt;
|
|
}
|
|
|
|
static struct rt6_info *rt6_make_pcpu_route(struct net *net,
|
|
struct fib6_info *rt)
|
|
{
|
|
struct rt6_info *pcpu_rt, *prev, **p;
|
|
|
|
pcpu_rt = ip6_rt_pcpu_alloc(rt);
|
|
if (!pcpu_rt) {
|
|
dst_hold(&net->ipv6.ip6_null_entry->dst);
|
|
return net->ipv6.ip6_null_entry;
|
|
}
|
|
|
|
dst_hold(&pcpu_rt->dst);
|
|
p = this_cpu_ptr(rt->rt6i_pcpu);
|
|
prev = cmpxchg(p, NULL, pcpu_rt);
|
|
BUG_ON(prev);
|
|
|
|
return pcpu_rt;
|
|
}
|
|
|
|
/* exception hash table implementation
|
|
*/
|
|
static DEFINE_SPINLOCK(rt6_exception_lock);
|
|
|
|
/* Remove rt6_ex from hash table and free the memory
|
|
* Caller must hold rt6_exception_lock
|
|
*/
|
|
static void rt6_remove_exception(struct rt6_exception_bucket *bucket,
|
|
struct rt6_exception *rt6_ex)
|
|
{
|
|
struct fib6_info *from;
|
|
struct net *net;
|
|
|
|
if (!bucket || !rt6_ex)
|
|
return;
|
|
|
|
net = dev_net(rt6_ex->rt6i->dst.dev);
|
|
net->ipv6.rt6_stats->fib_rt_cache--;
|
|
|
|
/* purge completely the exception to allow releasing the held resources:
|
|
* some [sk] cache may keep the dst around for unlimited time
|
|
*/
|
|
from = rcu_dereference_protected(rt6_ex->rt6i->from,
|
|
lockdep_is_held(&rt6_exception_lock));
|
|
rcu_assign_pointer(rt6_ex->rt6i->from, NULL);
|
|
fib6_info_release(from);
|
|
dst_dev_put(&rt6_ex->rt6i->dst);
|
|
|
|
hlist_del_rcu(&rt6_ex->hlist);
|
|
dst_release(&rt6_ex->rt6i->dst);
|
|
kfree_rcu(rt6_ex, rcu);
|
|
WARN_ON_ONCE(!bucket->depth);
|
|
bucket->depth--;
|
|
}
|
|
|
|
/* Remove oldest rt6_ex in bucket and free the memory
|
|
* Caller must hold rt6_exception_lock
|
|
*/
|
|
static void rt6_exception_remove_oldest(struct rt6_exception_bucket *bucket)
|
|
{
|
|
struct rt6_exception *rt6_ex, *oldest = NULL;
|
|
|
|
if (!bucket)
|
|
return;
|
|
|
|
hlist_for_each_entry(rt6_ex, &bucket->chain, hlist) {
|
|
if (!oldest || time_before(rt6_ex->stamp, oldest->stamp))
|
|
oldest = rt6_ex;
|
|
}
|
|
rt6_remove_exception(bucket, oldest);
|
|
}
|
|
|
|
static u32 rt6_exception_hash(const struct in6_addr *dst,
|
|
const struct in6_addr *src)
|
|
{
|
|
static u32 seed __read_mostly;
|
|
u32 val;
|
|
|
|
net_get_random_once(&seed, sizeof(seed));
|
|
val = jhash(dst, sizeof(*dst), seed);
|
|
|
|
#ifdef CONFIG_IPV6_SUBTREES
|
|
if (src)
|
|
val = jhash(src, sizeof(*src), val);
|
|
#endif
|
|
return hash_32(val, FIB6_EXCEPTION_BUCKET_SIZE_SHIFT);
|
|
}
|
|
|
|
/* Helper function to find the cached rt in the hash table
|
|
* and update bucket pointer to point to the bucket for this
|
|
* (daddr, saddr) pair
|
|
* Caller must hold rt6_exception_lock
|
|
*/
|
|
static struct rt6_exception *
|
|
__rt6_find_exception_spinlock(struct rt6_exception_bucket **bucket,
|
|
const struct in6_addr *daddr,
|
|
const struct in6_addr *saddr)
|
|
{
|
|
struct rt6_exception *rt6_ex;
|
|
u32 hval;
|
|
|
|
if (!(*bucket) || !daddr)
|
|
return NULL;
|
|
|
|
hval = rt6_exception_hash(daddr, saddr);
|
|
*bucket += hval;
|
|
|
|
hlist_for_each_entry(rt6_ex, &(*bucket)->chain, hlist) {
|
|
struct rt6_info *rt6 = rt6_ex->rt6i;
|
|
bool matched = ipv6_addr_equal(daddr, &rt6->rt6i_dst.addr);
|
|
|
|
#ifdef CONFIG_IPV6_SUBTREES
|
|
if (matched && saddr)
|
|
matched = ipv6_addr_equal(saddr, &rt6->rt6i_src.addr);
|
|
#endif
|
|
if (matched)
|
|
return rt6_ex;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
/* Helper function to find the cached rt in the hash table
|
|
* and update bucket pointer to point to the bucket for this
|
|
* (daddr, saddr) pair
|
|
* Caller must hold rcu_read_lock()
|
|
*/
|
|
static struct rt6_exception *
|
|
__rt6_find_exception_rcu(struct rt6_exception_bucket **bucket,
|
|
const struct in6_addr *daddr,
|
|
const struct in6_addr *saddr)
|
|
{
|
|
struct rt6_exception *rt6_ex;
|
|
u32 hval;
|
|
|
|
WARN_ON_ONCE(!rcu_read_lock_held());
|
|
|
|
if (!(*bucket) || !daddr)
|
|
return NULL;
|
|
|
|
hval = rt6_exception_hash(daddr, saddr);
|
|
*bucket += hval;
|
|
|
|
hlist_for_each_entry_rcu(rt6_ex, &(*bucket)->chain, hlist) {
|
|
struct rt6_info *rt6 = rt6_ex->rt6i;
|
|
bool matched = ipv6_addr_equal(daddr, &rt6->rt6i_dst.addr);
|
|
|
|
#ifdef CONFIG_IPV6_SUBTREES
|
|
if (matched && saddr)
|
|
matched = ipv6_addr_equal(saddr, &rt6->rt6i_src.addr);
|
|
#endif
|
|
if (matched)
|
|
return rt6_ex;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static unsigned int fib6_mtu(const struct fib6_info *rt)
|
|
{
|
|
unsigned int mtu;
|
|
|
|
if (rt->fib6_pmtu) {
|
|
mtu = rt->fib6_pmtu;
|
|
} else {
|
|
struct net_device *dev = fib6_info_nh_dev(rt);
|
|
struct inet6_dev *idev;
|
|
|
|
rcu_read_lock();
|
|
idev = __in6_dev_get(dev);
|
|
mtu = idev->cnf.mtu6;
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
mtu = min_t(unsigned int, mtu, IP6_MAX_MTU);
|
|
|
|
return mtu - lwtunnel_headroom(rt->fib6_nh.fib_nh_lws, mtu);
|
|
}
|
|
|
|
static int rt6_insert_exception(struct rt6_info *nrt,
|
|
struct fib6_info *ort)
|
|
{
|
|
struct net *net = dev_net(nrt->dst.dev);
|
|
struct rt6_exception_bucket *bucket;
|
|
struct in6_addr *src_key = NULL;
|
|
struct rt6_exception *rt6_ex;
|
|
int err = 0;
|
|
|
|
spin_lock_bh(&rt6_exception_lock);
|
|
|
|
if (ort->exception_bucket_flushed) {
|
|
err = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
bucket = rcu_dereference_protected(ort->rt6i_exception_bucket,
|
|
lockdep_is_held(&rt6_exception_lock));
|
|
if (!bucket) {
|
|
bucket = kcalloc(FIB6_EXCEPTION_BUCKET_SIZE, sizeof(*bucket),
|
|
GFP_ATOMIC);
|
|
if (!bucket) {
|
|
err = -ENOMEM;
|
|
goto out;
|
|
}
|
|
rcu_assign_pointer(ort->rt6i_exception_bucket, bucket);
|
|
}
|
|
|
|
#ifdef CONFIG_IPV6_SUBTREES
|
|
/* rt6i_src.plen != 0 indicates ort is in subtree
|
|
* and exception table is indexed by a hash of
|
|
* both rt6i_dst and rt6i_src.
|
|
* Otherwise, the exception table is indexed by
|
|
* a hash of only rt6i_dst.
|
|
*/
|
|
if (ort->fib6_src.plen)
|
|
src_key = &nrt->rt6i_src.addr;
|
|
#endif
|
|
/* rt6_mtu_change() might lower mtu on ort.
|
|
* Only insert this exception route if its mtu
|
|
* is less than ort's mtu value.
|
|
*/
|
|
if (dst_metric_raw(&nrt->dst, RTAX_MTU) >= fib6_mtu(ort)) {
|
|
err = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
rt6_ex = __rt6_find_exception_spinlock(&bucket, &nrt->rt6i_dst.addr,
|
|
src_key);
|
|
if (rt6_ex)
|
|
rt6_remove_exception(bucket, rt6_ex);
|
|
|
|
rt6_ex = kzalloc(sizeof(*rt6_ex), GFP_ATOMIC);
|
|
if (!rt6_ex) {
|
|
err = -ENOMEM;
|
|
goto out;
|
|
}
|
|
rt6_ex->rt6i = nrt;
|
|
rt6_ex->stamp = jiffies;
|
|
hlist_add_head_rcu(&rt6_ex->hlist, &bucket->chain);
|
|
bucket->depth++;
|
|
net->ipv6.rt6_stats->fib_rt_cache++;
|
|
|
|
if (bucket->depth > FIB6_MAX_DEPTH)
|
|
rt6_exception_remove_oldest(bucket);
|
|
|
|
out:
|
|
spin_unlock_bh(&rt6_exception_lock);
|
|
|
|
/* Update fn->fn_sernum to invalidate all cached dst */
|
|
if (!err) {
|
|
spin_lock_bh(&ort->fib6_table->tb6_lock);
|
|
fib6_update_sernum(net, ort);
|
|
spin_unlock_bh(&ort->fib6_table->tb6_lock);
|
|
fib6_force_start_gc(net);
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
void rt6_flush_exceptions(struct fib6_info *rt)
|
|
{
|
|
struct rt6_exception_bucket *bucket;
|
|
struct rt6_exception *rt6_ex;
|
|
struct hlist_node *tmp;
|
|
int i;
|
|
|
|
spin_lock_bh(&rt6_exception_lock);
|
|
/* Prevent rt6_insert_exception() to recreate the bucket list */
|
|
rt->exception_bucket_flushed = 1;
|
|
|
|
bucket = rcu_dereference_protected(rt->rt6i_exception_bucket,
|
|
lockdep_is_held(&rt6_exception_lock));
|
|
if (!bucket)
|
|
goto out;
|
|
|
|
for (i = 0; i < FIB6_EXCEPTION_BUCKET_SIZE; i++) {
|
|
hlist_for_each_entry_safe(rt6_ex, tmp, &bucket->chain, hlist)
|
|
rt6_remove_exception(bucket, rt6_ex);
|
|
WARN_ON_ONCE(bucket->depth);
|
|
bucket++;
|
|
}
|
|
|
|
out:
|
|
spin_unlock_bh(&rt6_exception_lock);
|
|
}
|
|
|
|
/* Find cached rt in the hash table inside passed in rt
|
|
* Caller has to hold rcu_read_lock()
|
|
*/
|
|
static struct rt6_info *rt6_find_cached_rt(struct fib6_info *rt,
|
|
struct in6_addr *daddr,
|
|
struct in6_addr *saddr)
|
|
{
|
|
struct rt6_exception_bucket *bucket;
|
|
struct in6_addr *src_key = NULL;
|
|
struct rt6_exception *rt6_ex;
|
|
struct rt6_info *res = NULL;
|
|
|
|
bucket = rcu_dereference(rt->rt6i_exception_bucket);
|
|
|
|
#ifdef CONFIG_IPV6_SUBTREES
|
|
/* rt6i_src.plen != 0 indicates rt is in subtree
|
|
* and exception table is indexed by a hash of
|
|
* both rt6i_dst and rt6i_src.
|
|
* Otherwise, the exception table is indexed by
|
|
* a hash of only rt6i_dst.
|
|
*/
|
|
if (rt->fib6_src.plen)
|
|
src_key = saddr;
|
|
#endif
|
|
rt6_ex = __rt6_find_exception_rcu(&bucket, daddr, src_key);
|
|
|
|
if (rt6_ex && !rt6_check_expired(rt6_ex->rt6i))
|
|
res = rt6_ex->rt6i;
|
|
|
|
return res;
|
|
}
|
|
|
|
/* Remove the passed in cached rt from the hash table that contains it */
|
|
static int rt6_remove_exception_rt(struct rt6_info *rt)
|
|
{
|
|
struct rt6_exception_bucket *bucket;
|
|
struct in6_addr *src_key = NULL;
|
|
struct rt6_exception *rt6_ex;
|
|
struct fib6_info *from;
|
|
int err;
|
|
|
|
from = rcu_dereference(rt->from);
|
|
if (!from ||
|
|
!(rt->rt6i_flags & RTF_CACHE))
|
|
return -EINVAL;
|
|
|
|
if (!rcu_access_pointer(from->rt6i_exception_bucket))
|
|
return -ENOENT;
|
|
|
|
spin_lock_bh(&rt6_exception_lock);
|
|
bucket = rcu_dereference_protected(from->rt6i_exception_bucket,
|
|
lockdep_is_held(&rt6_exception_lock));
|
|
#ifdef CONFIG_IPV6_SUBTREES
|
|
/* rt6i_src.plen != 0 indicates 'from' is in subtree
|
|
* and exception table is indexed by a hash of
|
|
* both rt6i_dst and rt6i_src.
|
|
* Otherwise, the exception table is indexed by
|
|
* a hash of only rt6i_dst.
|
|
*/
|
|
if (from->fib6_src.plen)
|
|
src_key = &rt->rt6i_src.addr;
|
|
#endif
|
|
rt6_ex = __rt6_find_exception_spinlock(&bucket,
|
|
&rt->rt6i_dst.addr,
|
|
src_key);
|
|
if (rt6_ex) {
|
|
rt6_remove_exception(bucket, rt6_ex);
|
|
err = 0;
|
|
} else {
|
|
err = -ENOENT;
|
|
}
|
|
|
|
spin_unlock_bh(&rt6_exception_lock);
|
|
return err;
|
|
}
|
|
|
|
/* Find rt6_ex which contains the passed in rt cache and
|
|
* refresh its stamp
|
|
*/
|
|
static void rt6_update_exception_stamp_rt(struct rt6_info *rt)
|
|
{
|
|
struct rt6_exception_bucket *bucket;
|
|
struct in6_addr *src_key = NULL;
|
|
struct rt6_exception *rt6_ex;
|
|
struct fib6_info *from;
|
|
|
|
rcu_read_lock();
|
|
from = rcu_dereference(rt->from);
|
|
if (!from || !(rt->rt6i_flags & RTF_CACHE))
|
|
goto unlock;
|
|
|
|
bucket = rcu_dereference(from->rt6i_exception_bucket);
|
|
|
|
#ifdef CONFIG_IPV6_SUBTREES
|
|
/* rt6i_src.plen != 0 indicates 'from' is in subtree
|
|
* and exception table is indexed by a hash of
|
|
* both rt6i_dst and rt6i_src.
|
|
* Otherwise, the exception table is indexed by
|
|
* a hash of only rt6i_dst.
|
|
*/
|
|
if (from->fib6_src.plen)
|
|
src_key = &rt->rt6i_src.addr;
|
|
#endif
|
|
rt6_ex = __rt6_find_exception_rcu(&bucket,
|
|
&rt->rt6i_dst.addr,
|
|
src_key);
|
|
if (rt6_ex)
|
|
rt6_ex->stamp = jiffies;
|
|
|
|
unlock:
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
static bool rt6_mtu_change_route_allowed(struct inet6_dev *idev,
|
|
struct rt6_info *rt, int mtu)
|
|
{
|
|
/* If the new MTU is lower than the route PMTU, this new MTU will be the
|
|
* lowest MTU in the path: always allow updating the route PMTU to
|
|
* reflect PMTU decreases.
|
|
*
|
|
* If the new MTU is higher, and the route PMTU is equal to the local
|
|
* MTU, this means the old MTU is the lowest in the path, so allow
|
|
* updating it: if other nodes now have lower MTUs, PMTU discovery will
|
|
* handle this.
|
|
*/
|
|
|
|
if (dst_mtu(&rt->dst) >= mtu)
|
|
return true;
|
|
|
|
if (dst_mtu(&rt->dst) == idev->cnf.mtu6)
|
|
return true;
|
|
|
|
return false;
|
|
}
|
|
|
|
static void rt6_exceptions_update_pmtu(struct inet6_dev *idev,
|
|
struct fib6_info *rt, int mtu)
|
|
{
|
|
struct rt6_exception_bucket *bucket;
|
|
struct rt6_exception *rt6_ex;
|
|
int i;
|
|
|
|
bucket = rcu_dereference_protected(rt->rt6i_exception_bucket,
|
|
lockdep_is_held(&rt6_exception_lock));
|
|
|
|
if (!bucket)
|
|
return;
|
|
|
|
for (i = 0; i < FIB6_EXCEPTION_BUCKET_SIZE; i++) {
|
|
hlist_for_each_entry(rt6_ex, &bucket->chain, hlist) {
|
|
struct rt6_info *entry = rt6_ex->rt6i;
|
|
|
|
/* For RTF_CACHE with rt6i_pmtu == 0 (i.e. a redirected
|
|
* route), the metrics of its rt->from have already
|
|
* been updated.
|
|
*/
|
|
if (dst_metric_raw(&entry->dst, RTAX_MTU) &&
|
|
rt6_mtu_change_route_allowed(idev, entry, mtu))
|
|
dst_metric_set(&entry->dst, RTAX_MTU, mtu);
|
|
}
|
|
bucket++;
|
|
}
|
|
}
|
|
|
|
#define RTF_CACHE_GATEWAY (RTF_GATEWAY | RTF_CACHE)
|
|
|
|
static void rt6_exceptions_clean_tohost(struct fib6_info *rt,
|
|
struct in6_addr *gateway)
|
|
{
|
|
struct rt6_exception_bucket *bucket;
|
|
struct rt6_exception *rt6_ex;
|
|
struct hlist_node *tmp;
|
|
int i;
|
|
|
|
if (!rcu_access_pointer(rt->rt6i_exception_bucket))
|
|
return;
|
|
|
|
spin_lock_bh(&rt6_exception_lock);
|
|
bucket = rcu_dereference_protected(rt->rt6i_exception_bucket,
|
|
lockdep_is_held(&rt6_exception_lock));
|
|
|
|
if (bucket) {
|
|
for (i = 0; i < FIB6_EXCEPTION_BUCKET_SIZE; i++) {
|
|
hlist_for_each_entry_safe(rt6_ex, tmp,
|
|
&bucket->chain, hlist) {
|
|
struct rt6_info *entry = rt6_ex->rt6i;
|
|
|
|
if ((entry->rt6i_flags & RTF_CACHE_GATEWAY) ==
|
|
RTF_CACHE_GATEWAY &&
|
|
ipv6_addr_equal(gateway,
|
|
&entry->rt6i_gateway)) {
|
|
rt6_remove_exception(bucket, rt6_ex);
|
|
}
|
|
}
|
|
bucket++;
|
|
}
|
|
}
|
|
|
|
spin_unlock_bh(&rt6_exception_lock);
|
|
}
|
|
|
|
static void rt6_age_examine_exception(struct rt6_exception_bucket *bucket,
|
|
struct rt6_exception *rt6_ex,
|
|
struct fib6_gc_args *gc_args,
|
|
unsigned long now)
|
|
{
|
|
struct rt6_info *rt = rt6_ex->rt6i;
|
|
|
|
/* we are pruning and obsoleting aged-out and non gateway exceptions
|
|
* even if others have still references to them, so that on next
|
|
* dst_check() such references can be dropped.
|
|
* EXPIRES exceptions - e.g. pmtu-generated ones are pruned when
|
|
* expired, independently from their aging, as per RFC 8201 section 4
|
|
*/
|
|
if (!(rt->rt6i_flags & RTF_EXPIRES)) {
|
|
if (time_after_eq(now, rt->dst.lastuse + gc_args->timeout)) {
|
|
RT6_TRACE("aging clone %p\n", rt);
|
|
rt6_remove_exception(bucket, rt6_ex);
|
|
return;
|
|
}
|
|
} else if (time_after(jiffies, rt->dst.expires)) {
|
|
RT6_TRACE("purging expired route %p\n", rt);
|
|
rt6_remove_exception(bucket, rt6_ex);
|
|
return;
|
|
}
|
|
|
|
if (rt->rt6i_flags & RTF_GATEWAY) {
|
|
struct neighbour *neigh;
|
|
__u8 neigh_flags = 0;
|
|
|
|
neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway);
|
|
if (neigh)
|
|
neigh_flags = neigh->flags;
|
|
|
|
if (!(neigh_flags & NTF_ROUTER)) {
|
|
RT6_TRACE("purging route %p via non-router but gateway\n",
|
|
rt);
|
|
rt6_remove_exception(bucket, rt6_ex);
|
|
return;
|
|
}
|
|
}
|
|
|
|
gc_args->more++;
|
|
}
|
|
|
|
void rt6_age_exceptions(struct fib6_info *rt,
|
|
struct fib6_gc_args *gc_args,
|
|
unsigned long now)
|
|
{
|
|
struct rt6_exception_bucket *bucket;
|
|
struct rt6_exception *rt6_ex;
|
|
struct hlist_node *tmp;
|
|
int i;
|
|
|
|
if (!rcu_access_pointer(rt->rt6i_exception_bucket))
|
|
return;
|
|
|
|
rcu_read_lock_bh();
|
|
spin_lock(&rt6_exception_lock);
|
|
bucket = rcu_dereference_protected(rt->rt6i_exception_bucket,
|
|
lockdep_is_held(&rt6_exception_lock));
|
|
|
|
if (bucket) {
|
|
for (i = 0; i < FIB6_EXCEPTION_BUCKET_SIZE; i++) {
|
|
hlist_for_each_entry_safe(rt6_ex, tmp,
|
|
&bucket->chain, hlist) {
|
|
rt6_age_examine_exception(bucket, rt6_ex,
|
|
gc_args, now);
|
|
}
|
|
bucket++;
|
|
}
|
|
}
|
|
spin_unlock(&rt6_exception_lock);
|
|
rcu_read_unlock_bh();
|
|
}
|
|
|
|
/* must be called with rcu lock held */
|
|
struct fib6_info *fib6_table_lookup(struct net *net, struct fib6_table *table,
|
|
int oif, struct flowi6 *fl6, int strict)
|
|
{
|
|
struct fib6_node *fn, *saved_fn;
|
|
struct fib6_info *f6i;
|
|
|
|
fn = fib6_node_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
|
|
saved_fn = fn;
|
|
|
|
if (fl6->flowi6_flags & FLOWI_FLAG_SKIP_NH_OIF)
|
|
oif = 0;
|
|
|
|
redo_rt6_select:
|
|
f6i = rt6_select(net, fn, oif, strict);
|
|
if (f6i == net->ipv6.fib6_null_entry) {
|
|
fn = fib6_backtrack(fn, &fl6->saddr);
|
|
if (fn)
|
|
goto redo_rt6_select;
|
|
else if (strict & RT6_LOOKUP_F_REACHABLE) {
|
|
/* also consider unreachable route */
|
|
strict &= ~RT6_LOOKUP_F_REACHABLE;
|
|
fn = saved_fn;
|
|
goto redo_rt6_select;
|
|
}
|
|
}
|
|
|
|
trace_fib6_table_lookup(net, f6i, table, fl6);
|
|
|
|
return f6i;
|
|
}
|
|
|
|
struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table,
|
|
int oif, struct flowi6 *fl6,
|
|
const struct sk_buff *skb, int flags)
|
|
{
|
|
struct fib6_info *f6i;
|
|
struct rt6_info *rt;
|
|
int strict = 0;
|
|
|
|
strict |= flags & RT6_LOOKUP_F_IFACE;
|
|
strict |= flags & RT6_LOOKUP_F_IGNORE_LINKSTATE;
|
|
if (net->ipv6.devconf_all->forwarding == 0)
|
|
strict |= RT6_LOOKUP_F_REACHABLE;
|
|
|
|
rcu_read_lock();
|
|
|
|
f6i = fib6_table_lookup(net, table, oif, fl6, strict);
|
|
if (f6i->fib6_nsiblings)
|
|
f6i = fib6_multipath_select(net, f6i, fl6, oif, skb, strict);
|
|
|
|
if (f6i == net->ipv6.fib6_null_entry) {
|
|
rt = net->ipv6.ip6_null_entry;
|
|
rcu_read_unlock();
|
|
dst_hold(&rt->dst);
|
|
return rt;
|
|
}
|
|
|
|
/*Search through exception table */
|
|
rt = rt6_find_cached_rt(f6i, &fl6->daddr, &fl6->saddr);
|
|
if (rt) {
|
|
if (ip6_hold_safe(net, &rt))
|
|
dst_use_noref(&rt->dst, jiffies);
|
|
|
|
rcu_read_unlock();
|
|
return rt;
|
|
} else if (unlikely((fl6->flowi6_flags & FLOWI_FLAG_KNOWN_NH) &&
|
|
!f6i->fib6_nh.fib_nh_gw_family)) {
|
|
/* Create a RTF_CACHE clone which will not be
|
|
* owned by the fib6 tree. It is for the special case where
|
|
* the daddr in the skb during the neighbor look-up is different
|
|
* from the fl6->daddr used to look-up route here.
|
|
*/
|
|
struct rt6_info *uncached_rt;
|
|
|
|
uncached_rt = ip6_rt_cache_alloc(f6i, &fl6->daddr, NULL);
|
|
|
|
rcu_read_unlock();
|
|
|
|
if (uncached_rt) {
|
|
/* Uncached_rt's refcnt is taken during ip6_rt_cache_alloc()
|
|
* No need for another dst_hold()
|
|
*/
|
|
rt6_uncached_list_add(uncached_rt);
|
|
atomic_inc(&net->ipv6.rt6_stats->fib_rt_uncache);
|
|
} else {
|
|
uncached_rt = net->ipv6.ip6_null_entry;
|
|
dst_hold(&uncached_rt->dst);
|
|
}
|
|
|
|
return uncached_rt;
|
|
} else {
|
|
/* Get a percpu copy */
|
|
|
|
struct rt6_info *pcpu_rt;
|
|
|
|
local_bh_disable();
|
|
pcpu_rt = rt6_get_pcpu_route(f6i);
|
|
|
|
if (!pcpu_rt)
|
|
pcpu_rt = rt6_make_pcpu_route(net, f6i);
|
|
|
|
local_bh_enable();
|
|
rcu_read_unlock();
|
|
|
|
return pcpu_rt;
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(ip6_pol_route);
|
|
|
|
static struct rt6_info *ip6_pol_route_input(struct net *net,
|
|
struct fib6_table *table,
|
|
struct flowi6 *fl6,
|
|
const struct sk_buff *skb,
|
|
int flags)
|
|
{
|
|
return ip6_pol_route(net, table, fl6->flowi6_iif, fl6, skb, flags);
|
|
}
|
|
|
|
struct dst_entry *ip6_route_input_lookup(struct net *net,
|
|
struct net_device *dev,
|
|
struct flowi6 *fl6,
|
|
const struct sk_buff *skb,
|
|
int flags)
|
|
{
|
|
if (rt6_need_strict(&fl6->daddr) && dev->type != ARPHRD_PIMREG)
|
|
flags |= RT6_LOOKUP_F_IFACE;
|
|
|
|
return fib6_rule_lookup(net, fl6, skb, flags, ip6_pol_route_input);
|
|
}
|
|
EXPORT_SYMBOL_GPL(ip6_route_input_lookup);
|
|
|
|
static void ip6_multipath_l3_keys(const struct sk_buff *skb,
|
|
struct flow_keys *keys,
|
|
struct flow_keys *flkeys)
|
|
{
|
|
const struct ipv6hdr *outer_iph = ipv6_hdr(skb);
|
|
const struct ipv6hdr *key_iph = outer_iph;
|
|
struct flow_keys *_flkeys = flkeys;
|
|
const struct ipv6hdr *inner_iph;
|
|
const struct icmp6hdr *icmph;
|
|
struct ipv6hdr _inner_iph;
|
|
struct icmp6hdr _icmph;
|
|
|
|
if (likely(outer_iph->nexthdr != IPPROTO_ICMPV6))
|
|
goto out;
|
|
|
|
icmph = skb_header_pointer(skb, skb_transport_offset(skb),
|
|
sizeof(_icmph), &_icmph);
|
|
if (!icmph)
|
|
goto out;
|
|
|
|
if (icmph->icmp6_type != ICMPV6_DEST_UNREACH &&
|
|
icmph->icmp6_type != ICMPV6_PKT_TOOBIG &&
|
|
icmph->icmp6_type != ICMPV6_TIME_EXCEED &&
|
|
icmph->icmp6_type != ICMPV6_PARAMPROB)
|
|
goto out;
|
|
|
|
inner_iph = skb_header_pointer(skb,
|
|
skb_transport_offset(skb) + sizeof(*icmph),
|
|
sizeof(_inner_iph), &_inner_iph);
|
|
if (!inner_iph)
|
|
goto out;
|
|
|
|
key_iph = inner_iph;
|
|
_flkeys = NULL;
|
|
out:
|
|
if (_flkeys) {
|
|
keys->addrs.v6addrs.src = _flkeys->addrs.v6addrs.src;
|
|
keys->addrs.v6addrs.dst = _flkeys->addrs.v6addrs.dst;
|
|
keys->tags.flow_label = _flkeys->tags.flow_label;
|
|
keys->basic.ip_proto = _flkeys->basic.ip_proto;
|
|
} else {
|
|
keys->addrs.v6addrs.src = key_iph->saddr;
|
|
keys->addrs.v6addrs.dst = key_iph->daddr;
|
|
keys->tags.flow_label = ip6_flowlabel(key_iph);
|
|
keys->basic.ip_proto = key_iph->nexthdr;
|
|
}
|
|
}
|
|
|
|
/* if skb is set it will be used and fl6 can be NULL */
|
|
u32 rt6_multipath_hash(const struct net *net, const struct flowi6 *fl6,
|
|
const struct sk_buff *skb, struct flow_keys *flkeys)
|
|
{
|
|
struct flow_keys hash_keys;
|
|
u32 mhash;
|
|
|
|
switch (ip6_multipath_hash_policy(net)) {
|
|
case 0:
|
|
memset(&hash_keys, 0, sizeof(hash_keys));
|
|
hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
|
|
if (skb) {
|
|
ip6_multipath_l3_keys(skb, &hash_keys, flkeys);
|
|
} else {
|
|
hash_keys.addrs.v6addrs.src = fl6->saddr;
|
|
hash_keys.addrs.v6addrs.dst = fl6->daddr;
|
|
hash_keys.tags.flow_label = (__force u32)flowi6_get_flowlabel(fl6);
|
|
hash_keys.basic.ip_proto = fl6->flowi6_proto;
|
|
}
|
|
break;
|
|
case 1:
|
|
if (skb) {
|
|
unsigned int flag = FLOW_DISSECTOR_F_STOP_AT_ENCAP;
|
|
struct flow_keys keys;
|
|
|
|
/* short-circuit if we already have L4 hash present */
|
|
if (skb->l4_hash)
|
|
return skb_get_hash_raw(skb) >> 1;
|
|
|
|
memset(&hash_keys, 0, sizeof(hash_keys));
|
|
|
|
if (!flkeys) {
|
|
skb_flow_dissect_flow_keys(skb, &keys, flag);
|
|
flkeys = &keys;
|
|
}
|
|
hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
|
|
hash_keys.addrs.v6addrs.src = flkeys->addrs.v6addrs.src;
|
|
hash_keys.addrs.v6addrs.dst = flkeys->addrs.v6addrs.dst;
|
|
hash_keys.ports.src = flkeys->ports.src;
|
|
hash_keys.ports.dst = flkeys->ports.dst;
|
|
hash_keys.basic.ip_proto = flkeys->basic.ip_proto;
|
|
} else {
|
|
memset(&hash_keys, 0, sizeof(hash_keys));
|
|
hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
|
|
hash_keys.addrs.v6addrs.src = fl6->saddr;
|
|
hash_keys.addrs.v6addrs.dst = fl6->daddr;
|
|
hash_keys.ports.src = fl6->fl6_sport;
|
|
hash_keys.ports.dst = fl6->fl6_dport;
|
|
hash_keys.basic.ip_proto = fl6->flowi6_proto;
|
|
}
|
|
break;
|
|
}
|
|
mhash = flow_hash_from_keys(&hash_keys);
|
|
|
|
return mhash >> 1;
|
|
}
|
|
|
|
void ip6_route_input(struct sk_buff *skb)
|
|
{
|
|
const struct ipv6hdr *iph = ipv6_hdr(skb);
|
|
struct net *net = dev_net(skb->dev);
|
|
int flags = RT6_LOOKUP_F_HAS_SADDR;
|
|
struct ip_tunnel_info *tun_info;
|
|
struct flowi6 fl6 = {
|
|
.flowi6_iif = skb->dev->ifindex,
|
|
.daddr = iph->daddr,
|
|
.saddr = iph->saddr,
|
|
.flowlabel = ip6_flowinfo(iph),
|
|
.flowi6_mark = skb->mark,
|
|
.flowi6_proto = iph->nexthdr,
|
|
};
|
|
struct flow_keys *flkeys = NULL, _flkeys;
|
|
|
|
tun_info = skb_tunnel_info(skb);
|
|
if (tun_info && !(tun_info->mode & IP_TUNNEL_INFO_TX))
|
|
fl6.flowi6_tun_key.tun_id = tun_info->key.tun_id;
|
|
|
|
if (fib6_rules_early_flow_dissect(net, skb, &fl6, &_flkeys))
|
|
flkeys = &_flkeys;
|
|
|
|
if (unlikely(fl6.flowi6_proto == IPPROTO_ICMPV6))
|
|
fl6.mp_hash = rt6_multipath_hash(net, &fl6, skb, flkeys);
|
|
skb_dst_drop(skb);
|
|
skb_dst_set(skb,
|
|
ip6_route_input_lookup(net, skb->dev, &fl6, skb, flags));
|
|
}
|
|
|
|
static struct rt6_info *ip6_pol_route_output(struct net *net,
|
|
struct fib6_table *table,
|
|
struct flowi6 *fl6,
|
|
const struct sk_buff *skb,
|
|
int flags)
|
|
{
|
|
return ip6_pol_route(net, table, fl6->flowi6_oif, fl6, skb, flags);
|
|
}
|
|
|
|
struct dst_entry *ip6_route_output_flags(struct net *net, const struct sock *sk,
|
|
struct flowi6 *fl6, int flags)
|
|
{
|
|
bool any_src;
|
|
|
|
if (ipv6_addr_type(&fl6->daddr) &
|
|
(IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL)) {
|
|
struct dst_entry *dst;
|
|
|
|
dst = l3mdev_link_scope_lookup(net, fl6);
|
|
if (dst)
|
|
return dst;
|
|
}
|
|
|
|
fl6->flowi6_iif = LOOPBACK_IFINDEX;
|
|
|
|
any_src = ipv6_addr_any(&fl6->saddr);
|
|
if ((sk && sk->sk_bound_dev_if) || rt6_need_strict(&fl6->daddr) ||
|
|
(fl6->flowi6_oif && any_src))
|
|
flags |= RT6_LOOKUP_F_IFACE;
|
|
|
|
if (!any_src)
|
|
flags |= RT6_LOOKUP_F_HAS_SADDR;
|
|
else if (sk)
|
|
flags |= rt6_srcprefs2flags(inet6_sk(sk)->srcprefs);
|
|
|
|
return fib6_rule_lookup(net, fl6, NULL, flags, ip6_pol_route_output);
|
|
}
|
|
EXPORT_SYMBOL_GPL(ip6_route_output_flags);
|
|
|
|
struct dst_entry *ip6_blackhole_route(struct net *net, struct dst_entry *dst_orig)
|
|
{
|
|
struct rt6_info *rt, *ort = (struct rt6_info *) dst_orig;
|
|
struct net_device *loopback_dev = net->loopback_dev;
|
|
struct dst_entry *new = NULL;
|
|
|
|
rt = dst_alloc(&ip6_dst_blackhole_ops, loopback_dev, 1,
|
|
DST_OBSOLETE_DEAD, 0);
|
|
if (rt) {
|
|
rt6_info_init(rt);
|
|
atomic_inc(&net->ipv6.rt6_stats->fib_rt_alloc);
|
|
|
|
new = &rt->dst;
|
|
new->__use = 1;
|
|
new->input = dst_discard;
|
|
new->output = dst_discard_out;
|
|
|
|
dst_copy_metrics(new, &ort->dst);
|
|
|
|
rt->rt6i_idev = in6_dev_get(loopback_dev);
|
|
rt->rt6i_gateway = ort->rt6i_gateway;
|
|
rt->rt6i_flags = ort->rt6i_flags & ~RTF_PCPU;
|
|
|
|
memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key));
|
|
#ifdef CONFIG_IPV6_SUBTREES
|
|
memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key));
|
|
#endif
|
|
}
|
|
|
|
dst_release(dst_orig);
|
|
return new ? new : ERR_PTR(-ENOMEM);
|
|
}
|
|
|
|
/*
|
|
* Destination cache support functions
|
|
*/
|
|
|
|
static bool fib6_check(struct fib6_info *f6i, u32 cookie)
|
|
{
|
|
u32 rt_cookie = 0;
|
|
|
|
if (!fib6_get_cookie_safe(f6i, &rt_cookie) || rt_cookie != cookie)
|
|
return false;
|
|
|
|
if (fib6_check_expired(f6i))
|
|
return false;
|
|
|
|
return true;
|
|
}
|
|
|
|
static struct dst_entry *rt6_check(struct rt6_info *rt,
|
|
struct fib6_info *from,
|
|
u32 cookie)
|
|
{
|
|
u32 rt_cookie = 0;
|
|
|
|
if ((from && !fib6_get_cookie_safe(from, &rt_cookie)) ||
|
|
rt_cookie != cookie)
|
|
return NULL;
|
|
|
|
if (rt6_check_expired(rt))
|
|
return NULL;
|
|
|
|
return &rt->dst;
|
|
}
|
|
|
|
static struct dst_entry *rt6_dst_from_check(struct rt6_info *rt,
|
|
struct fib6_info *from,
|
|
u32 cookie)
|
|
{
|
|
if (!__rt6_check_expired(rt) &&
|
|
rt->dst.obsolete == DST_OBSOLETE_FORCE_CHK &&
|
|
fib6_check(from, cookie))
|
|
return &rt->dst;
|
|
else
|
|
return NULL;
|
|
}
|
|
|
|
static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie)
|
|
{
|
|
struct dst_entry *dst_ret;
|
|
struct fib6_info *from;
|
|
struct rt6_info *rt;
|
|
|
|
rt = container_of(dst, struct rt6_info, dst);
|
|
|
|
rcu_read_lock();
|
|
|
|
/* All IPV6 dsts are created with ->obsolete set to the value
|
|
* DST_OBSOLETE_FORCE_CHK which forces validation calls down
|
|
* into this function always.
|
|
*/
|
|
|
|
from = rcu_dereference(rt->from);
|
|
|
|
if (from && (rt->rt6i_flags & RTF_PCPU ||
|
|
unlikely(!list_empty(&rt->rt6i_uncached))))
|
|
dst_ret = rt6_dst_from_check(rt, from, cookie);
|
|
else
|
|
dst_ret = rt6_check(rt, from, cookie);
|
|
|
|
rcu_read_unlock();
|
|
|
|
return dst_ret;
|
|
}
|
|
|
|
static struct dst_entry *ip6_negative_advice(struct dst_entry *dst)
|
|
{
|
|
struct rt6_info *rt = (struct rt6_info *) dst;
|
|
|
|
if (rt) {
|
|
if (rt->rt6i_flags & RTF_CACHE) {
|
|
rcu_read_lock();
|
|
if (rt6_check_expired(rt)) {
|
|
rt6_remove_exception_rt(rt);
|
|
dst = NULL;
|
|
}
|
|
rcu_read_unlock();
|
|
} else {
|
|
dst_release(dst);
|
|
dst = NULL;
|
|
}
|
|
}
|
|
return dst;
|
|
}
|
|
|
|
static void ip6_link_failure(struct sk_buff *skb)
|
|
{
|
|
struct rt6_info *rt;
|
|
|
|
icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0);
|
|
|
|
rt = (struct rt6_info *) skb_dst(skb);
|
|
if (rt) {
|
|
rcu_read_lock();
|
|
if (rt->rt6i_flags & RTF_CACHE) {
|
|
rt6_remove_exception_rt(rt);
|
|
} else {
|
|
struct fib6_info *from;
|
|
struct fib6_node *fn;
|
|
|
|
from = rcu_dereference(rt->from);
|
|
if (from) {
|
|
fn = rcu_dereference(from->fib6_node);
|
|
if (fn && (rt->rt6i_flags & RTF_DEFAULT))
|
|
fn->fn_sernum = -1;
|
|
}
|
|
}
|
|
rcu_read_unlock();
|
|
}
|
|
}
|
|
|
|
static void rt6_update_expires(struct rt6_info *rt0, int timeout)
|
|
{
|
|
if (!(rt0->rt6i_flags & RTF_EXPIRES)) {
|
|
struct fib6_info *from;
|
|
|
|
rcu_read_lock();
|
|
from = rcu_dereference(rt0->from);
|
|
if (from)
|
|
rt0->dst.expires = from->expires;
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
dst_set_expires(&rt0->dst, timeout);
|
|
rt0->rt6i_flags |= RTF_EXPIRES;
|
|
}
|
|
|
|
static void rt6_do_update_pmtu(struct rt6_info *rt, u32 mtu)
|
|
{
|
|
struct net *net = dev_net(rt->dst.dev);
|
|
|
|
dst_metric_set(&rt->dst, RTAX_MTU, mtu);
|
|
rt->rt6i_flags |= RTF_MODIFIED;
|
|
rt6_update_expires(rt, net->ipv6.sysctl.ip6_rt_mtu_expires);
|
|
}
|
|
|
|
static bool rt6_cache_allowed_for_pmtu(const struct rt6_info *rt)
|
|
{
|
|
return !(rt->rt6i_flags & RTF_CACHE) &&
|
|
(rt->rt6i_flags & RTF_PCPU || rcu_access_pointer(rt->from));
|
|
}
|
|
|
|
static void __ip6_rt_update_pmtu(struct dst_entry *dst, const struct sock *sk,
|
|
const struct ipv6hdr *iph, u32 mtu)
|
|
{
|
|
const struct in6_addr *daddr, *saddr;
|
|
struct rt6_info *rt6 = (struct rt6_info *)dst;
|
|
|
|
if (dst_metric_locked(dst, RTAX_MTU))
|
|
return;
|
|
|
|
if (iph) {
|
|
daddr = &iph->daddr;
|
|
saddr = &iph->saddr;
|
|
} else if (sk) {
|
|
daddr = &sk->sk_v6_daddr;
|
|
saddr = &inet6_sk(sk)->saddr;
|
|
} else {
|
|
daddr = NULL;
|
|
saddr = NULL;
|
|
}
|
|
dst_confirm_neigh(dst, daddr);
|
|
mtu = max_t(u32, mtu, IPV6_MIN_MTU);
|
|
if (mtu >= dst_mtu(dst))
|
|
return;
|
|
|
|
if (!rt6_cache_allowed_for_pmtu(rt6)) {
|
|
rt6_do_update_pmtu(rt6, mtu);
|
|
/* update rt6_ex->stamp for cache */
|
|
if (rt6->rt6i_flags & RTF_CACHE)
|
|
rt6_update_exception_stamp_rt(rt6);
|
|
} else if (daddr) {
|
|
struct fib6_info *from;
|
|
struct rt6_info *nrt6;
|
|
|
|
rcu_read_lock();
|
|
from = rcu_dereference(rt6->from);
|
|
nrt6 = ip6_rt_cache_alloc(from, daddr, saddr);
|
|
if (nrt6) {
|
|
rt6_do_update_pmtu(nrt6, mtu);
|
|
if (rt6_insert_exception(nrt6, from))
|
|
dst_release_immediate(&nrt6->dst);
|
|
}
|
|
rcu_read_unlock();
|
|
}
|
|
}
|
|
|
|
static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
|
|
struct sk_buff *skb, u32 mtu)
|
|
{
|
|
__ip6_rt_update_pmtu(dst, sk, skb ? ipv6_hdr(skb) : NULL, mtu);
|
|
}
|
|
|
|
void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu,
|
|
int oif, u32 mark, kuid_t uid)
|
|
{
|
|
const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
|
|
struct dst_entry *dst;
|
|
struct flowi6 fl6 = {
|
|
.flowi6_oif = oif,
|
|
.flowi6_mark = mark ? mark : IP6_REPLY_MARK(net, skb->mark),
|
|
.daddr = iph->daddr,
|
|
.saddr = iph->saddr,
|
|
.flowlabel = ip6_flowinfo(iph),
|
|
.flowi6_uid = uid,
|
|
};
|
|
|
|
dst = ip6_route_output(net, NULL, &fl6);
|
|
if (!dst->error)
|
|
__ip6_rt_update_pmtu(dst, NULL, iph, ntohl(mtu));
|
|
dst_release(dst);
|
|
}
|
|
EXPORT_SYMBOL_GPL(ip6_update_pmtu);
|
|
|
|
void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu)
|
|
{
|
|
int oif = sk->sk_bound_dev_if;
|
|
struct dst_entry *dst;
|
|
|
|
if (!oif && skb->dev)
|
|
oif = l3mdev_master_ifindex(skb->dev);
|
|
|
|
ip6_update_pmtu(skb, sock_net(sk), mtu, oif, sk->sk_mark, sk->sk_uid);
|
|
|
|
dst = __sk_dst_get(sk);
|
|
if (!dst || !dst->obsolete ||
|
|
dst->ops->check(dst, inet6_sk(sk)->dst_cookie))
|
|
return;
|
|
|
|
bh_lock_sock(sk);
|
|
if (!sock_owned_by_user(sk) && !ipv6_addr_v4mapped(&sk->sk_v6_daddr))
|
|
ip6_datagram_dst_update(sk, false);
|
|
bh_unlock_sock(sk);
|
|
}
|
|
EXPORT_SYMBOL_GPL(ip6_sk_update_pmtu);
|
|
|
|
void ip6_sk_dst_store_flow(struct sock *sk, struct dst_entry *dst,
|
|
const struct flowi6 *fl6)
|
|
{
|
|
#ifdef CONFIG_IPV6_SUBTREES
|
|
struct ipv6_pinfo *np = inet6_sk(sk);
|
|
#endif
|
|
|
|
ip6_dst_store(sk, dst,
|
|
ipv6_addr_equal(&fl6->daddr, &sk->sk_v6_daddr) ?
|
|
&sk->sk_v6_daddr : NULL,
|
|
#ifdef CONFIG_IPV6_SUBTREES
|
|
ipv6_addr_equal(&fl6->saddr, &np->saddr) ?
|
|
&np->saddr :
|
|
#endif
|
|
NULL);
|
|
}
|
|
|
|
/* Handle redirects */
|
|
struct ip6rd_flowi {
|
|
struct flowi6 fl6;
|
|
struct in6_addr gateway;
|
|
};
|
|
|
|
static struct rt6_info *__ip6_route_redirect(struct net *net,
|
|
struct fib6_table *table,
|
|
struct flowi6 *fl6,
|
|
const struct sk_buff *skb,
|
|
int flags)
|
|
{
|
|
struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl6;
|
|
struct rt6_info *ret = NULL, *rt_cache;
|
|
struct fib6_info *rt;
|
|
struct fib6_node *fn;
|
|
|
|
/* Get the "current" route for this destination and
|
|
* check if the redirect has come from appropriate router.
|
|
*
|
|
* RFC 4861 specifies that redirects should only be
|
|
* accepted if they come from the nexthop to the target.
|
|
* Due to the way the routes are chosen, this notion
|
|
* is a bit fuzzy and one might need to check all possible
|
|
* routes.
|
|
*/
|
|
|
|
rcu_read_lock();
|
|
fn = fib6_node_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
|
|
restart:
|
|
for_each_fib6_node_rt_rcu(fn) {
|
|
if (rt->fib6_nh.fib_nh_flags & RTNH_F_DEAD)
|
|
continue;
|
|
if (fib6_check_expired(rt))
|
|
continue;
|
|
if (rt->fib6_flags & RTF_REJECT)
|
|
break;
|
|
if (!rt->fib6_nh.fib_nh_gw_family)
|
|
continue;
|
|
if (fl6->flowi6_oif != rt->fib6_nh.fib_nh_dev->ifindex)
|
|
continue;
|
|
/* rt_cache's gateway might be different from its 'parent'
|
|
* in the case of an ip redirect.
|
|
* So we keep searching in the exception table if the gateway
|
|
* is different.
|
|
*/
|
|
if (!ipv6_addr_equal(&rdfl->gateway, &rt->fib6_nh.fib_nh_gw6)) {
|
|
rt_cache = rt6_find_cached_rt(rt,
|
|
&fl6->daddr,
|
|
&fl6->saddr);
|
|
if (rt_cache &&
|
|
ipv6_addr_equal(&rdfl->gateway,
|
|
&rt_cache->rt6i_gateway)) {
|
|
ret = rt_cache;
|
|
break;
|
|
}
|
|
continue;
|
|
}
|
|
break;
|
|
}
|
|
|
|
if (!rt)
|
|
rt = net->ipv6.fib6_null_entry;
|
|
else if (rt->fib6_flags & RTF_REJECT) {
|
|
ret = net->ipv6.ip6_null_entry;
|
|
goto out;
|
|
}
|
|
|
|
if (rt == net->ipv6.fib6_null_entry) {
|
|
fn = fib6_backtrack(fn, &fl6->saddr);
|
|
if (fn)
|
|
goto restart;
|
|
}
|
|
|
|
out:
|
|
if (ret)
|
|
ip6_hold_safe(net, &ret);
|
|
else
|
|
ret = ip6_create_rt_rcu(rt);
|
|
|
|
rcu_read_unlock();
|
|
|
|
trace_fib6_table_lookup(net, rt, table, fl6);
|
|
return ret;
|
|
};
|
|
|
|
static struct dst_entry *ip6_route_redirect(struct net *net,
|
|
const struct flowi6 *fl6,
|
|
const struct sk_buff *skb,
|
|
const struct in6_addr *gateway)
|
|
{
|
|
int flags = RT6_LOOKUP_F_HAS_SADDR;
|
|
struct ip6rd_flowi rdfl;
|
|
|
|
rdfl.fl6 = *fl6;
|
|
rdfl.gateway = *gateway;
|
|
|
|
return fib6_rule_lookup(net, &rdfl.fl6, skb,
|
|
flags, __ip6_route_redirect);
|
|
}
|
|
|
|
void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark,
|
|
kuid_t uid)
|
|
{
|
|
const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
|
|
struct dst_entry *dst;
|
|
struct flowi6 fl6 = {
|
|
.flowi6_iif = LOOPBACK_IFINDEX,
|
|
.flowi6_oif = oif,
|
|
.flowi6_mark = mark,
|
|
.daddr = iph->daddr,
|
|
.saddr = iph->saddr,
|
|
.flowlabel = ip6_flowinfo(iph),
|
|
.flowi6_uid = uid,
|
|
};
|
|
|
|
dst = ip6_route_redirect(net, &fl6, skb, &ipv6_hdr(skb)->saddr);
|
|
rt6_do_redirect(dst, NULL, skb);
|
|
dst_release(dst);
|
|
}
|
|
EXPORT_SYMBOL_GPL(ip6_redirect);
|
|
|
|
void ip6_redirect_no_header(struct sk_buff *skb, struct net *net, int oif)
|
|
{
|
|
const struct ipv6hdr *iph = ipv6_hdr(skb);
|
|
const struct rd_msg *msg = (struct rd_msg *)icmp6_hdr(skb);
|
|
struct dst_entry *dst;
|
|
struct flowi6 fl6 = {
|
|
.flowi6_iif = LOOPBACK_IFINDEX,
|
|
.flowi6_oif = oif,
|
|
.daddr = msg->dest,
|
|
.saddr = iph->daddr,
|
|
.flowi6_uid = sock_net_uid(net, NULL),
|
|
};
|
|
|
|
dst = ip6_route_redirect(net, &fl6, skb, &iph->saddr);
|
|
rt6_do_redirect(dst, NULL, skb);
|
|
dst_release(dst);
|
|
}
|
|
|
|
void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk)
|
|
{
|
|
ip6_redirect(skb, sock_net(sk), sk->sk_bound_dev_if, sk->sk_mark,
|
|
sk->sk_uid);
|
|
}
|
|
EXPORT_SYMBOL_GPL(ip6_sk_redirect);
|
|
|
|
static unsigned int ip6_default_advmss(const struct dst_entry *dst)
|
|
{
|
|
struct net_device *dev = dst->dev;
|
|
unsigned int mtu = dst_mtu(dst);
|
|
struct net *net = dev_net(dev);
|
|
|
|
mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr);
|
|
|
|
if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss)
|
|
mtu = net->ipv6.sysctl.ip6_rt_min_advmss;
|
|
|
|
/*
|
|
* Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and
|
|
* corresponding MSS is IPV6_MAXPLEN - tcp_header_size.
|
|
* IPV6_MAXPLEN is also valid and means: "any MSS,
|
|
* rely only on pmtu discovery"
|
|
*/
|
|
if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr))
|
|
mtu = IPV6_MAXPLEN;
|
|
return mtu;
|
|
}
|
|
|
|
static unsigned int ip6_mtu(const struct dst_entry *dst)
|
|
{
|
|
struct inet6_dev *idev;
|
|
unsigned int mtu;
|
|
|
|
mtu = dst_metric_raw(dst, RTAX_MTU);
|
|
if (mtu)
|
|
goto out;
|
|
|
|
mtu = IPV6_MIN_MTU;
|
|
|
|
rcu_read_lock();
|
|
idev = __in6_dev_get(dst->dev);
|
|
if (idev)
|
|
mtu = idev->cnf.mtu6;
|
|
rcu_read_unlock();
|
|
|
|
out:
|
|
mtu = min_t(unsigned int, mtu, IP6_MAX_MTU);
|
|
|
|
return mtu - lwtunnel_headroom(dst->lwtstate, mtu);
|
|
}
|
|
|
|
/* MTU selection:
|
|
* 1. mtu on route is locked - use it
|
|
* 2. mtu from nexthop exception
|
|
* 3. mtu from egress device
|
|
*
|
|
* based on ip6_dst_mtu_forward and exception logic of
|
|
* rt6_find_cached_rt; called with rcu_read_lock
|
|
*/
|
|
u32 ip6_mtu_from_fib6(struct fib6_info *f6i, struct in6_addr *daddr,
|
|
struct in6_addr *saddr)
|
|
{
|
|
struct rt6_exception_bucket *bucket;
|
|
struct rt6_exception *rt6_ex;
|
|
struct in6_addr *src_key;
|
|
struct inet6_dev *idev;
|
|
u32 mtu = 0;
|
|
|
|
if (unlikely(fib6_metric_locked(f6i, RTAX_MTU))) {
|
|
mtu = f6i->fib6_pmtu;
|
|
if (mtu)
|
|
goto out;
|
|
}
|
|
|
|
src_key = NULL;
|
|
#ifdef CONFIG_IPV6_SUBTREES
|
|
if (f6i->fib6_src.plen)
|
|
src_key = saddr;
|
|
#endif
|
|
|
|
bucket = rcu_dereference(f6i->rt6i_exception_bucket);
|
|
rt6_ex = __rt6_find_exception_rcu(&bucket, daddr, src_key);
|
|
if (rt6_ex && !rt6_check_expired(rt6_ex->rt6i))
|
|
mtu = dst_metric_raw(&rt6_ex->rt6i->dst, RTAX_MTU);
|
|
|
|
if (likely(!mtu)) {
|
|
struct net_device *dev = fib6_info_nh_dev(f6i);
|
|
|
|
mtu = IPV6_MIN_MTU;
|
|
idev = __in6_dev_get(dev);
|
|
if (idev && idev->cnf.mtu6 > mtu)
|
|
mtu = idev->cnf.mtu6;
|
|
}
|
|
|
|
mtu = min_t(unsigned int, mtu, IP6_MAX_MTU);
|
|
out:
|
|
return mtu - lwtunnel_headroom(fib6_info_nh_lwt(f6i), mtu);
|
|
}
|
|
|
|
struct dst_entry *icmp6_dst_alloc(struct net_device *dev,
|
|
struct flowi6 *fl6)
|
|
{
|
|
struct dst_entry *dst;
|
|
struct rt6_info *rt;
|
|
struct inet6_dev *idev = in6_dev_get(dev);
|
|
struct net *net = dev_net(dev);
|
|
|
|
if (unlikely(!idev))
|
|
return ERR_PTR(-ENODEV);
|
|
|
|
rt = ip6_dst_alloc(net, dev, 0);
|
|
if (unlikely(!rt)) {
|
|
in6_dev_put(idev);
|
|
dst = ERR_PTR(-ENOMEM);
|
|
goto out;
|
|
}
|
|
|
|
rt->dst.flags |= DST_HOST;
|
|
rt->dst.input = ip6_input;
|
|
rt->dst.output = ip6_output;
|
|
rt->rt6i_gateway = fl6->daddr;
|
|
rt->rt6i_dst.addr = fl6->daddr;
|
|
rt->rt6i_dst.plen = 128;
|
|
rt->rt6i_idev = idev;
|
|
dst_metric_set(&rt->dst, RTAX_HOPLIMIT, 0);
|
|
|
|
/* Add this dst into uncached_list so that rt6_disable_ip() can
|
|
* do proper release of the net_device
|
|
*/
|
|
rt6_uncached_list_add(rt);
|
|
atomic_inc(&net->ipv6.rt6_stats->fib_rt_uncache);
|
|
|
|
dst = xfrm_lookup(net, &rt->dst, flowi6_to_flowi(fl6), NULL, 0);
|
|
|
|
out:
|
|
return dst;
|
|
}
|
|
|
|
static int ip6_dst_gc(struct dst_ops *ops)
|
|
{
|
|
struct net *net = container_of(ops, struct net, ipv6.ip6_dst_ops);
|
|
int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval;
|
|
int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size;
|
|
int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity;
|
|
int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout;
|
|
unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc;
|
|
int entries;
|
|
|
|
entries = dst_entries_get_fast(ops);
|
|
if (time_after(rt_last_gc + rt_min_interval, jiffies) &&
|
|
entries <= rt_max_size)
|
|
goto out;
|
|
|
|
net->ipv6.ip6_rt_gc_expire++;
|
|
fib6_run_gc(net->ipv6.ip6_rt_gc_expire, net, true);
|
|
entries = dst_entries_get_slow(ops);
|
|
if (entries < ops->gc_thresh)
|
|
net->ipv6.ip6_rt_gc_expire = rt_gc_timeout>>1;
|
|
out:
|
|
net->ipv6.ip6_rt_gc_expire -= net->ipv6.ip6_rt_gc_expire>>rt_elasticity;
|
|
return entries > rt_max_size;
|
|
}
|
|
|
|
static struct rt6_info *ip6_nh_lookup_table(struct net *net,
|
|
struct fib6_config *cfg,
|
|
const struct in6_addr *gw_addr,
|
|
u32 tbid, int flags)
|
|
{
|
|
struct flowi6 fl6 = {
|
|
.flowi6_oif = cfg->fc_ifindex,
|
|
.daddr = *gw_addr,
|
|
.saddr = cfg->fc_prefsrc,
|
|
};
|
|
struct fib6_table *table;
|
|
struct rt6_info *rt;
|
|
|
|
table = fib6_get_table(net, tbid);
|
|
if (!table)
|
|
return NULL;
|
|
|
|
if (!ipv6_addr_any(&cfg->fc_prefsrc))
|
|
flags |= RT6_LOOKUP_F_HAS_SADDR;
|
|
|
|
flags |= RT6_LOOKUP_F_IGNORE_LINKSTATE;
|
|
rt = ip6_pol_route(net, table, cfg->fc_ifindex, &fl6, NULL, flags);
|
|
|
|
/* if table lookup failed, fall back to full lookup */
|
|
if (rt == net->ipv6.ip6_null_entry) {
|
|
ip6_rt_put(rt);
|
|
rt = NULL;
|
|
}
|
|
|
|
return rt;
|
|
}
|
|
|
|
static int ip6_route_check_nh_onlink(struct net *net,
|
|
struct fib6_config *cfg,
|
|
const struct net_device *dev,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
u32 tbid = l3mdev_fib_table(dev) ? : RT_TABLE_MAIN;
|
|
const struct in6_addr *gw_addr = &cfg->fc_gateway;
|
|
u32 flags = RTF_LOCAL | RTF_ANYCAST | RTF_REJECT;
|
|
struct fib6_info *from;
|
|
struct rt6_info *grt;
|
|
int err;
|
|
|
|
err = 0;
|
|
grt = ip6_nh_lookup_table(net, cfg, gw_addr, tbid, 0);
|
|
if (grt) {
|
|
rcu_read_lock();
|
|
from = rcu_dereference(grt->from);
|
|
if (!grt->dst.error &&
|
|
/* ignore match if it is the default route */
|
|
from && !ipv6_addr_any(&from->fib6_dst.addr) &&
|
|
(grt->rt6i_flags & flags || dev != grt->dst.dev)) {
|
|
NL_SET_ERR_MSG(extack,
|
|
"Nexthop has invalid gateway or device mismatch");
|
|
err = -EINVAL;
|
|
}
|
|
rcu_read_unlock();
|
|
|
|
ip6_rt_put(grt);
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
static int ip6_route_check_nh(struct net *net,
|
|
struct fib6_config *cfg,
|
|
struct net_device **_dev,
|
|
struct inet6_dev **idev)
|
|
{
|
|
const struct in6_addr *gw_addr = &cfg->fc_gateway;
|
|
struct net_device *dev = _dev ? *_dev : NULL;
|
|
struct rt6_info *grt = NULL;
|
|
int err = -EHOSTUNREACH;
|
|
|
|
if (cfg->fc_table) {
|
|
int flags = RT6_LOOKUP_F_IFACE;
|
|
|
|
grt = ip6_nh_lookup_table(net, cfg, gw_addr,
|
|
cfg->fc_table, flags);
|
|
if (grt) {
|
|
if (grt->rt6i_flags & RTF_GATEWAY ||
|
|
(dev && dev != grt->dst.dev)) {
|
|
ip6_rt_put(grt);
|
|
grt = NULL;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (!grt)
|
|
grt = rt6_lookup(net, gw_addr, NULL, cfg->fc_ifindex, NULL, 1);
|
|
|
|
if (!grt)
|
|
goto out;
|
|
|
|
if (dev) {
|
|
if (dev != grt->dst.dev) {
|
|
ip6_rt_put(grt);
|
|
goto out;
|
|
}
|
|
} else {
|
|
*_dev = dev = grt->dst.dev;
|
|
*idev = grt->rt6i_idev;
|
|
dev_hold(dev);
|
|
in6_dev_hold(grt->rt6i_idev);
|
|
}
|
|
|
|
if (!(grt->rt6i_flags & RTF_GATEWAY))
|
|
err = 0;
|
|
|
|
ip6_rt_put(grt);
|
|
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
static int ip6_validate_gw(struct net *net, struct fib6_config *cfg,
|
|
struct net_device **_dev, struct inet6_dev **idev,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
const struct in6_addr *gw_addr = &cfg->fc_gateway;
|
|
int gwa_type = ipv6_addr_type(gw_addr);
|
|
bool skip_dev = gwa_type & IPV6_ADDR_LINKLOCAL ? false : true;
|
|
const struct net_device *dev = *_dev;
|
|
bool need_addr_check = !dev;
|
|
int err = -EINVAL;
|
|
|
|
/* if gw_addr is local we will fail to detect this in case
|
|
* address is still TENTATIVE (DAD in progress). rt6_lookup()
|
|
* will return already-added prefix route via interface that
|
|
* prefix route was assigned to, which might be non-loopback.
|
|
*/
|
|
if (dev &&
|
|
ipv6_chk_addr_and_flags(net, gw_addr, dev, skip_dev, 0, 0)) {
|
|
NL_SET_ERR_MSG(extack, "Gateway can not be a local address");
|
|
goto out;
|
|
}
|
|
|
|
if (gwa_type != (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_UNICAST)) {
|
|
/* IPv6 strictly inhibits using not link-local
|
|
* addresses as nexthop address.
|
|
* Otherwise, router will not able to send redirects.
|
|
* It is very good, but in some (rare!) circumstances
|
|
* (SIT, PtP, NBMA NOARP links) it is handy to allow
|
|
* some exceptions. --ANK
|
|
* We allow IPv4-mapped nexthops to support RFC4798-type
|
|
* addressing
|
|
*/
|
|
if (!(gwa_type & (IPV6_ADDR_UNICAST | IPV6_ADDR_MAPPED))) {
|
|
NL_SET_ERR_MSG(extack, "Invalid gateway address");
|
|
goto out;
|
|
}
|
|
|
|
if (cfg->fc_flags & RTNH_F_ONLINK)
|
|
err = ip6_route_check_nh_onlink(net, cfg, dev, extack);
|
|
else
|
|
err = ip6_route_check_nh(net, cfg, _dev, idev);
|
|
|
|
if (err)
|
|
goto out;
|
|
}
|
|
|
|
/* reload in case device was changed */
|
|
dev = *_dev;
|
|
|
|
err = -EINVAL;
|
|
if (!dev) {
|
|
NL_SET_ERR_MSG(extack, "Egress device not specified");
|
|
goto out;
|
|
} else if (dev->flags & IFF_LOOPBACK) {
|
|
NL_SET_ERR_MSG(extack,
|
|
"Egress device can not be loopback device for this route");
|
|
goto out;
|
|
}
|
|
|
|
/* if we did not check gw_addr above, do so now that the
|
|
* egress device has been resolved.
|
|
*/
|
|
if (need_addr_check &&
|
|
ipv6_chk_addr_and_flags(net, gw_addr, dev, skip_dev, 0, 0)) {
|
|
NL_SET_ERR_MSG(extack, "Gateway can not be a local address");
|
|
goto out;
|
|
}
|
|
|
|
err = 0;
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
static bool fib6_is_reject(u32 flags, struct net_device *dev, int addr_type)
|
|
{
|
|
if ((flags & RTF_REJECT) ||
|
|
(dev && (dev->flags & IFF_LOOPBACK) &&
|
|
!(addr_type & IPV6_ADDR_LOOPBACK) &&
|
|
!(flags & RTF_LOCAL)))
|
|
return true;
|
|
|
|
return false;
|
|
}
|
|
|
|
int fib6_nh_init(struct net *net, struct fib6_nh *fib6_nh,
|
|
struct fib6_config *cfg, gfp_t gfp_flags,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
struct net_device *dev = NULL;
|
|
struct inet6_dev *idev = NULL;
|
|
int addr_type;
|
|
int err;
|
|
|
|
fib6_nh->fib_nh_family = AF_INET6;
|
|
|
|
err = -ENODEV;
|
|
if (cfg->fc_ifindex) {
|
|
dev = dev_get_by_index(net, cfg->fc_ifindex);
|
|
if (!dev)
|
|
goto out;
|
|
idev = in6_dev_get(dev);
|
|
if (!idev)
|
|
goto out;
|
|
}
|
|
|
|
if (cfg->fc_flags & RTNH_F_ONLINK) {
|
|
if (!dev) {
|
|
NL_SET_ERR_MSG(extack,
|
|
"Nexthop device required for onlink");
|
|
goto out;
|
|
}
|
|
|
|
if (!(dev->flags & IFF_UP)) {
|
|
NL_SET_ERR_MSG(extack, "Nexthop device is not up");
|
|
err = -ENETDOWN;
|
|
goto out;
|
|
}
|
|
|
|
fib6_nh->fib_nh_flags |= RTNH_F_ONLINK;
|
|
}
|
|
|
|
fib6_nh->fib_nh_weight = 1;
|
|
|
|
/* We cannot add true routes via loopback here,
|
|
* they would result in kernel looping; promote them to reject routes
|
|
*/
|
|
addr_type = ipv6_addr_type(&cfg->fc_dst);
|
|
if (fib6_is_reject(cfg->fc_flags, dev, addr_type)) {
|
|
/* hold loopback dev/idev if we haven't done so. */
|
|
if (dev != net->loopback_dev) {
|
|
if (dev) {
|
|
dev_put(dev);
|
|
in6_dev_put(idev);
|
|
}
|
|
dev = net->loopback_dev;
|
|
dev_hold(dev);
|
|
idev = in6_dev_get(dev);
|
|
if (!idev) {
|
|
err = -ENODEV;
|
|
goto out;
|
|
}
|
|
}
|
|
goto set_dev;
|
|
}
|
|
|
|
if (cfg->fc_flags & RTF_GATEWAY) {
|
|
err = ip6_validate_gw(net, cfg, &dev, &idev, extack);
|
|
if (err)
|
|
goto out;
|
|
|
|
fib6_nh->fib_nh_gw6 = cfg->fc_gateway;
|
|
fib6_nh->fib_nh_gw_family = AF_INET6;
|
|
}
|
|
|
|
err = -ENODEV;
|
|
if (!dev)
|
|
goto out;
|
|
|
|
if (idev->cnf.disable_ipv6) {
|
|
NL_SET_ERR_MSG(extack, "IPv6 is disabled on nexthop device");
|
|
err = -EACCES;
|
|
goto out;
|
|
}
|
|
|
|
if (!(dev->flags & IFF_UP) && !cfg->fc_ignore_dev_down) {
|
|
NL_SET_ERR_MSG(extack, "Nexthop device is not up");
|
|
err = -ENETDOWN;
|
|
goto out;
|
|
}
|
|
|
|
if (!(cfg->fc_flags & (RTF_LOCAL | RTF_ANYCAST)) &&
|
|
!netif_carrier_ok(dev))
|
|
fib6_nh->fib_nh_flags |= RTNH_F_LINKDOWN;
|
|
|
|
err = fib_nh_common_init(&fib6_nh->nh_common, cfg->fc_encap,
|
|
cfg->fc_encap_type, cfg, gfp_flags, extack);
|
|
if (err)
|
|
goto out;
|
|
set_dev:
|
|
fib6_nh->fib_nh_dev = dev;
|
|
fib6_nh->fib_nh_oif = dev->ifindex;
|
|
err = 0;
|
|
out:
|
|
if (idev)
|
|
in6_dev_put(idev);
|
|
|
|
if (err) {
|
|
lwtstate_put(fib6_nh->fib_nh_lws);
|
|
fib6_nh->fib_nh_lws = NULL;
|
|
if (dev)
|
|
dev_put(dev);
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
void fib6_nh_release(struct fib6_nh *fib6_nh)
|
|
{
|
|
fib_nh_common_release(&fib6_nh->nh_common);
|
|
}
|
|
|
|
static struct fib6_info *ip6_route_info_create(struct fib6_config *cfg,
|
|
gfp_t gfp_flags,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
struct net *net = cfg->fc_nlinfo.nl_net;
|
|
struct fib6_info *rt = NULL;
|
|
struct fib6_table *table;
|
|
int err = -EINVAL;
|
|
int addr_type;
|
|
|
|
/* RTF_PCPU is an internal flag; can not be set by userspace */
|
|
if (cfg->fc_flags & RTF_PCPU) {
|
|
NL_SET_ERR_MSG(extack, "Userspace can not set RTF_PCPU");
|
|
goto out;
|
|
}
|
|
|
|
/* RTF_CACHE is an internal flag; can not be set by userspace */
|
|
if (cfg->fc_flags & RTF_CACHE) {
|
|
NL_SET_ERR_MSG(extack, "Userspace can not set RTF_CACHE");
|
|
goto out;
|
|
}
|
|
|
|
if (cfg->fc_type > RTN_MAX) {
|
|
NL_SET_ERR_MSG(extack, "Invalid route type");
|
|
goto out;
|
|
}
|
|
|
|
if (cfg->fc_dst_len > 128) {
|
|
NL_SET_ERR_MSG(extack, "Invalid prefix length");
|
|
goto out;
|
|
}
|
|
if (cfg->fc_src_len > 128) {
|
|
NL_SET_ERR_MSG(extack, "Invalid source address length");
|
|
goto out;
|
|
}
|
|
#ifndef CONFIG_IPV6_SUBTREES
|
|
if (cfg->fc_src_len) {
|
|
NL_SET_ERR_MSG(extack,
|
|
"Specifying source address requires IPV6_SUBTREES to be enabled");
|
|
goto out;
|
|
}
|
|
#endif
|
|
|
|
err = -ENOBUFS;
|
|
if (cfg->fc_nlinfo.nlh &&
|
|
!(cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_CREATE)) {
|
|
table = fib6_get_table(net, cfg->fc_table);
|
|
if (!table) {
|
|
pr_warn("NLM_F_CREATE should be specified when creating new route\n");
|
|
table = fib6_new_table(net, cfg->fc_table);
|
|
}
|
|
} else {
|
|
table = fib6_new_table(net, cfg->fc_table);
|
|
}
|
|
|
|
if (!table)
|
|
goto out;
|
|
|
|
err = -ENOMEM;
|
|
rt = fib6_info_alloc(gfp_flags);
|
|
if (!rt)
|
|
goto out;
|
|
|
|
rt->fib6_metrics = ip_fib_metrics_init(net, cfg->fc_mx, cfg->fc_mx_len,
|
|
extack);
|
|
if (IS_ERR(rt->fib6_metrics)) {
|
|
err = PTR_ERR(rt->fib6_metrics);
|
|
/* Do not leave garbage there. */
|
|
rt->fib6_metrics = (struct dst_metrics *)&dst_default_metrics;
|
|
goto out;
|
|
}
|
|
|
|
if (cfg->fc_flags & RTF_ADDRCONF)
|
|
rt->dst_nocount = true;
|
|
|
|
if (cfg->fc_flags & RTF_EXPIRES)
|
|
fib6_set_expires(rt, jiffies +
|
|
clock_t_to_jiffies(cfg->fc_expires));
|
|
else
|
|
fib6_clean_expires(rt);
|
|
|
|
if (cfg->fc_protocol == RTPROT_UNSPEC)
|
|
cfg->fc_protocol = RTPROT_BOOT;
|
|
rt->fib6_protocol = cfg->fc_protocol;
|
|
|
|
rt->fib6_table = table;
|
|
rt->fib6_metric = cfg->fc_metric;
|
|
rt->fib6_type = cfg->fc_type;
|
|
rt->fib6_flags = cfg->fc_flags & ~RTF_GATEWAY;
|
|
|
|
ipv6_addr_prefix(&rt->fib6_dst.addr, &cfg->fc_dst, cfg->fc_dst_len);
|
|
rt->fib6_dst.plen = cfg->fc_dst_len;
|
|
if (rt->fib6_dst.plen == 128)
|
|
rt->dst_host = true;
|
|
|
|
#ifdef CONFIG_IPV6_SUBTREES
|
|
ipv6_addr_prefix(&rt->fib6_src.addr, &cfg->fc_src, cfg->fc_src_len);
|
|
rt->fib6_src.plen = cfg->fc_src_len;
|
|
#endif
|
|
err = fib6_nh_init(net, &rt->fib6_nh, cfg, gfp_flags, extack);
|
|
if (err)
|
|
goto out;
|
|
|
|
/* We cannot add true routes via loopback here,
|
|
* they would result in kernel looping; promote them to reject routes
|
|
*/
|
|
addr_type = ipv6_addr_type(&cfg->fc_dst);
|
|
if (fib6_is_reject(cfg->fc_flags, rt->fib6_nh.fib_nh_dev, addr_type))
|
|
rt->fib6_flags = RTF_REJECT | RTF_NONEXTHOP;
|
|
|
|
if (!ipv6_addr_any(&cfg->fc_prefsrc)) {
|
|
struct net_device *dev = fib6_info_nh_dev(rt);
|
|
|
|
if (!ipv6_chk_addr(net, &cfg->fc_prefsrc, dev, 0)) {
|
|
NL_SET_ERR_MSG(extack, "Invalid source address");
|
|
err = -EINVAL;
|
|
goto out;
|
|
}
|
|
rt->fib6_prefsrc.addr = cfg->fc_prefsrc;
|
|
rt->fib6_prefsrc.plen = 128;
|
|
} else
|
|
rt->fib6_prefsrc.plen = 0;
|
|
|
|
return rt;
|
|
out:
|
|
fib6_info_release(rt);
|
|
return ERR_PTR(err);
|
|
}
|
|
|
|
int ip6_route_add(struct fib6_config *cfg, gfp_t gfp_flags,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
struct fib6_info *rt;
|
|
int err;
|
|
|
|
rt = ip6_route_info_create(cfg, gfp_flags, extack);
|
|
if (IS_ERR(rt))
|
|
return PTR_ERR(rt);
|
|
|
|
err = __ip6_ins_rt(rt, &cfg->fc_nlinfo, extack);
|
|
fib6_info_release(rt);
|
|
|
|
return err;
|
|
}
|
|
|
|
static int __ip6_del_rt(struct fib6_info *rt, struct nl_info *info)
|
|
{
|
|
struct net *net = info->nl_net;
|
|
struct fib6_table *table;
|
|
int err;
|
|
|
|
if (rt == net->ipv6.fib6_null_entry) {
|
|
err = -ENOENT;
|
|
goto out;
|
|
}
|
|
|
|
table = rt->fib6_table;
|
|
spin_lock_bh(&table->tb6_lock);
|
|
err = fib6_del(rt, info);
|
|
spin_unlock_bh(&table->tb6_lock);
|
|
|
|
out:
|
|
fib6_info_release(rt);
|
|
return err;
|
|
}
|
|
|
|
int ip6_del_rt(struct net *net, struct fib6_info *rt)
|
|
{
|
|
struct nl_info info = { .nl_net = net };
|
|
|
|
return __ip6_del_rt(rt, &info);
|
|
}
|
|
|
|
static int __ip6_del_rt_siblings(struct fib6_info *rt, struct fib6_config *cfg)
|
|
{
|
|
struct nl_info *info = &cfg->fc_nlinfo;
|
|
struct net *net = info->nl_net;
|
|
struct sk_buff *skb = NULL;
|
|
struct fib6_table *table;
|
|
int err = -ENOENT;
|
|
|
|
if (rt == net->ipv6.fib6_null_entry)
|
|
goto out_put;
|
|
table = rt->fib6_table;
|
|
spin_lock_bh(&table->tb6_lock);
|
|
|
|
if (rt->fib6_nsiblings && cfg->fc_delete_all_nh) {
|
|
struct fib6_info *sibling, *next_sibling;
|
|
|
|
/* prefer to send a single notification with all hops */
|
|
skb = nlmsg_new(rt6_nlmsg_size(rt), gfp_any());
|
|
if (skb) {
|
|
u32 seq = info->nlh ? info->nlh->nlmsg_seq : 0;
|
|
|
|
if (rt6_fill_node(net, skb, rt, NULL,
|
|
NULL, NULL, 0, RTM_DELROUTE,
|
|
info->portid, seq, 0) < 0) {
|
|
kfree_skb(skb);
|
|
skb = NULL;
|
|
} else
|
|
info->skip_notify = 1;
|
|
}
|
|
|
|
list_for_each_entry_safe(sibling, next_sibling,
|
|
&rt->fib6_siblings,
|
|
fib6_siblings) {
|
|
err = fib6_del(sibling, info);
|
|
if (err)
|
|
goto out_unlock;
|
|
}
|
|
}
|
|
|
|
err = fib6_del(rt, info);
|
|
out_unlock:
|
|
spin_unlock_bh(&table->tb6_lock);
|
|
out_put:
|
|
fib6_info_release(rt);
|
|
|
|
if (skb) {
|
|
rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE,
|
|
info->nlh, gfp_any());
|
|
}
|
|
return err;
|
|
}
|
|
|
|
static int ip6_del_cached_rt(struct rt6_info *rt, struct fib6_config *cfg)
|
|
{
|
|
int rc = -ESRCH;
|
|
|
|
if (cfg->fc_ifindex && rt->dst.dev->ifindex != cfg->fc_ifindex)
|
|
goto out;
|
|
|
|
if (cfg->fc_flags & RTF_GATEWAY &&
|
|
!ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway))
|
|
goto out;
|
|
|
|
rc = rt6_remove_exception_rt(rt);
|
|
out:
|
|
return rc;
|
|
}
|
|
|
|
static int ip6_route_del(struct fib6_config *cfg,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
struct rt6_info *rt_cache;
|
|
struct fib6_table *table;
|
|
struct fib6_info *rt;
|
|
struct fib6_node *fn;
|
|
int err = -ESRCH;
|
|
|
|
table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table);
|
|
if (!table) {
|
|
NL_SET_ERR_MSG(extack, "FIB table does not exist");
|
|
return err;
|
|
}
|
|
|
|
rcu_read_lock();
|
|
|
|
fn = fib6_locate(&table->tb6_root,
|
|
&cfg->fc_dst, cfg->fc_dst_len,
|
|
&cfg->fc_src, cfg->fc_src_len,
|
|
!(cfg->fc_flags & RTF_CACHE));
|
|
|
|
if (fn) {
|
|
for_each_fib6_node_rt_rcu(fn) {
|
|
struct fib6_nh *nh;
|
|
|
|
if (cfg->fc_flags & RTF_CACHE) {
|
|
int rc;
|
|
|
|
rt_cache = rt6_find_cached_rt(rt, &cfg->fc_dst,
|
|
&cfg->fc_src);
|
|
if (rt_cache) {
|
|
rc = ip6_del_cached_rt(rt_cache, cfg);
|
|
if (rc != -ESRCH) {
|
|
rcu_read_unlock();
|
|
return rc;
|
|
}
|
|
}
|
|
continue;
|
|
}
|
|
|
|
nh = &rt->fib6_nh;
|
|
if (cfg->fc_ifindex &&
|
|
(!nh->fib_nh_dev ||
|
|
nh->fib_nh_dev->ifindex != cfg->fc_ifindex))
|
|
continue;
|
|
if (cfg->fc_flags & RTF_GATEWAY &&
|
|
!ipv6_addr_equal(&cfg->fc_gateway, &nh->fib_nh_gw6))
|
|
continue;
|
|
if (cfg->fc_metric && cfg->fc_metric != rt->fib6_metric)
|
|
continue;
|
|
if (cfg->fc_protocol && cfg->fc_protocol != rt->fib6_protocol)
|
|
continue;
|
|
if (!fib6_info_hold_safe(rt))
|
|
continue;
|
|
rcu_read_unlock();
|
|
|
|
/* if gateway was specified only delete the one hop */
|
|
if (cfg->fc_flags & RTF_GATEWAY)
|
|
return __ip6_del_rt(rt, &cfg->fc_nlinfo);
|
|
|
|
return __ip6_del_rt_siblings(rt, cfg);
|
|
}
|
|
}
|
|
rcu_read_unlock();
|
|
|
|
return err;
|
|
}
|
|
|
|
static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_buff *skb)
|
|
{
|
|
struct netevent_redirect netevent;
|
|
struct rt6_info *rt, *nrt = NULL;
|
|
struct ndisc_options ndopts;
|
|
struct inet6_dev *in6_dev;
|
|
struct neighbour *neigh;
|
|
struct fib6_info *from;
|
|
struct rd_msg *msg;
|
|
int optlen, on_link;
|
|
u8 *lladdr;
|
|
|
|
optlen = skb_tail_pointer(skb) - skb_transport_header(skb);
|
|
optlen -= sizeof(*msg);
|
|
|
|
if (optlen < 0) {
|
|
net_dbg_ratelimited("rt6_do_redirect: packet too short\n");
|
|
return;
|
|
}
|
|
|
|
msg = (struct rd_msg *)icmp6_hdr(skb);
|
|
|
|
if (ipv6_addr_is_multicast(&msg->dest)) {
|
|
net_dbg_ratelimited("rt6_do_redirect: destination address is multicast\n");
|
|
return;
|
|
}
|
|
|
|
on_link = 0;
|
|
if (ipv6_addr_equal(&msg->dest, &msg->target)) {
|
|
on_link = 1;
|
|
} else if (ipv6_addr_type(&msg->target) !=
|
|
(IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) {
|
|
net_dbg_ratelimited("rt6_do_redirect: target address is not link-local unicast\n");
|
|
return;
|
|
}
|
|
|
|
in6_dev = __in6_dev_get(skb->dev);
|
|
if (!in6_dev)
|
|
return;
|
|
if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects)
|
|
return;
|
|
|
|
/* RFC2461 8.1:
|
|
* The IP source address of the Redirect MUST be the same as the current
|
|
* first-hop router for the specified ICMP Destination Address.
|
|
*/
|
|
|
|
if (!ndisc_parse_options(skb->dev, msg->opt, optlen, &ndopts)) {
|
|
net_dbg_ratelimited("rt6_redirect: invalid ND options\n");
|
|
return;
|
|
}
|
|
|
|
lladdr = NULL;
|
|
if (ndopts.nd_opts_tgt_lladdr) {
|
|
lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr,
|
|
skb->dev);
|
|
if (!lladdr) {
|
|
net_dbg_ratelimited("rt6_redirect: invalid link-layer address length\n");
|
|
return;
|
|
}
|
|
}
|
|
|
|
rt = (struct rt6_info *) dst;
|
|
if (rt->rt6i_flags & RTF_REJECT) {
|
|
net_dbg_ratelimited("rt6_redirect: source isn't a valid nexthop for redirect target\n");
|
|
return;
|
|
}
|
|
|
|
/* Redirect received -> path was valid.
|
|
* Look, redirects are sent only in response to data packets,
|
|
* so that this nexthop apparently is reachable. --ANK
|
|
*/
|
|
dst_confirm_neigh(&rt->dst, &ipv6_hdr(skb)->saddr);
|
|
|
|
neigh = __neigh_lookup(&nd_tbl, &msg->target, skb->dev, 1);
|
|
if (!neigh)
|
|
return;
|
|
|
|
/*
|
|
* We have finally decided to accept it.
|
|
*/
|
|
|
|
ndisc_update(skb->dev, neigh, lladdr, NUD_STALE,
|
|
NEIGH_UPDATE_F_WEAK_OVERRIDE|
|
|
NEIGH_UPDATE_F_OVERRIDE|
|
|
(on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
|
|
NEIGH_UPDATE_F_ISROUTER)),
|
|
NDISC_REDIRECT, &ndopts);
|
|
|
|
rcu_read_lock();
|
|
from = rcu_dereference(rt->from);
|
|
/* This fib6_info_hold() is safe here because we hold reference to rt
|
|
* and rt already holds reference to fib6_info.
|
|
*/
|
|
fib6_info_hold(from);
|
|
rcu_read_unlock();
|
|
|
|
nrt = ip6_rt_cache_alloc(from, &msg->dest, NULL);
|
|
if (!nrt)
|
|
goto out;
|
|
|
|
nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE;
|
|
if (on_link)
|
|
nrt->rt6i_flags &= ~RTF_GATEWAY;
|
|
|
|
nrt->rt6i_gateway = *(struct in6_addr *)neigh->primary_key;
|
|
|
|
/* No need to remove rt from the exception table if rt is
|
|
* a cached route because rt6_insert_exception() will
|
|
* takes care of it
|
|
*/
|
|
if (rt6_insert_exception(nrt, from)) {
|
|
dst_release_immediate(&nrt->dst);
|
|
goto out;
|
|
}
|
|
|
|
netevent.old = &rt->dst;
|
|
netevent.new = &nrt->dst;
|
|
netevent.daddr = &msg->dest;
|
|
netevent.neigh = neigh;
|
|
call_netevent_notifiers(NETEVENT_REDIRECT, &netevent);
|
|
|
|
out:
|
|
fib6_info_release(from);
|
|
neigh_release(neigh);
|
|
}
|
|
|
|
#ifdef CONFIG_IPV6_ROUTE_INFO
|
|
static struct fib6_info *rt6_get_route_info(struct net *net,
|
|
const struct in6_addr *prefix, int prefixlen,
|
|
const struct in6_addr *gwaddr,
|
|
struct net_device *dev)
|
|
{
|
|
u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_INFO;
|
|
int ifindex = dev->ifindex;
|
|
struct fib6_node *fn;
|
|
struct fib6_info *rt = NULL;
|
|
struct fib6_table *table;
|
|
|
|
table = fib6_get_table(net, tb_id);
|
|
if (!table)
|
|
return NULL;
|
|
|
|
rcu_read_lock();
|
|
fn = fib6_locate(&table->tb6_root, prefix, prefixlen, NULL, 0, true);
|
|
if (!fn)
|
|
goto out;
|
|
|
|
for_each_fib6_node_rt_rcu(fn) {
|
|
if (rt->fib6_nh.fib_nh_dev->ifindex != ifindex)
|
|
continue;
|
|
if (!(rt->fib6_flags & RTF_ROUTEINFO) ||
|
|
!rt->fib6_nh.fib_nh_gw_family)
|
|
continue;
|
|
if (!ipv6_addr_equal(&rt->fib6_nh.fib_nh_gw6, gwaddr))
|
|
continue;
|
|
if (!fib6_info_hold_safe(rt))
|
|
continue;
|
|
break;
|
|
}
|
|
out:
|
|
rcu_read_unlock();
|
|
return rt;
|
|
}
|
|
|
|
static struct fib6_info *rt6_add_route_info(struct net *net,
|
|
const struct in6_addr *prefix, int prefixlen,
|
|
const struct in6_addr *gwaddr,
|
|
struct net_device *dev,
|
|
unsigned int pref)
|
|
{
|
|
struct fib6_config cfg = {
|
|
.fc_metric = IP6_RT_PRIO_USER,
|
|
.fc_ifindex = dev->ifindex,
|
|
.fc_dst_len = prefixlen,
|
|
.fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO |
|
|
RTF_UP | RTF_PREF(pref),
|
|
.fc_protocol = RTPROT_RA,
|
|
.fc_type = RTN_UNICAST,
|
|
.fc_nlinfo.portid = 0,
|
|
.fc_nlinfo.nlh = NULL,
|
|
.fc_nlinfo.nl_net = net,
|
|
};
|
|
|
|
cfg.fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_INFO,
|
|
cfg.fc_dst = *prefix;
|
|
cfg.fc_gateway = *gwaddr;
|
|
|
|
/* We should treat it as a default route if prefix length is 0. */
|
|
if (!prefixlen)
|
|
cfg.fc_flags |= RTF_DEFAULT;
|
|
|
|
ip6_route_add(&cfg, GFP_ATOMIC, NULL);
|
|
|
|
return rt6_get_route_info(net, prefix, prefixlen, gwaddr, dev);
|
|
}
|
|
#endif
|
|
|
|
struct fib6_info *rt6_get_dflt_router(struct net *net,
|
|
const struct in6_addr *addr,
|
|
struct net_device *dev)
|
|
{
|
|
u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_DFLT;
|
|
struct fib6_info *rt;
|
|
struct fib6_table *table;
|
|
|
|
table = fib6_get_table(net, tb_id);
|
|
if (!table)
|
|
return NULL;
|
|
|
|
rcu_read_lock();
|
|
for_each_fib6_node_rt_rcu(&table->tb6_root) {
|
|
struct fib6_nh *nh = &rt->fib6_nh;
|
|
|
|
if (dev == nh->fib_nh_dev &&
|
|
((rt->fib6_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) &&
|
|
ipv6_addr_equal(&nh->fib_nh_gw6, addr))
|
|
break;
|
|
}
|
|
if (rt && !fib6_info_hold_safe(rt))
|
|
rt = NULL;
|
|
rcu_read_unlock();
|
|
return rt;
|
|
}
|
|
|
|
struct fib6_info *rt6_add_dflt_router(struct net *net,
|
|
const struct in6_addr *gwaddr,
|
|
struct net_device *dev,
|
|
unsigned int pref)
|
|
{
|
|
struct fib6_config cfg = {
|
|
.fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_DFLT,
|
|
.fc_metric = IP6_RT_PRIO_USER,
|
|
.fc_ifindex = dev->ifindex,
|
|
.fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT |
|
|
RTF_UP | RTF_EXPIRES | RTF_PREF(pref),
|
|
.fc_protocol = RTPROT_RA,
|
|
.fc_type = RTN_UNICAST,
|
|
.fc_nlinfo.portid = 0,
|
|
.fc_nlinfo.nlh = NULL,
|
|
.fc_nlinfo.nl_net = net,
|
|
};
|
|
|
|
cfg.fc_gateway = *gwaddr;
|
|
|
|
if (!ip6_route_add(&cfg, GFP_ATOMIC, NULL)) {
|
|
struct fib6_table *table;
|
|
|
|
table = fib6_get_table(dev_net(dev), cfg.fc_table);
|
|
if (table)
|
|
table->flags |= RT6_TABLE_HAS_DFLT_ROUTER;
|
|
}
|
|
|
|
return rt6_get_dflt_router(net, gwaddr, dev);
|
|
}
|
|
|
|
static void __rt6_purge_dflt_routers(struct net *net,
|
|
struct fib6_table *table)
|
|
{
|
|
struct fib6_info *rt;
|
|
|
|
restart:
|
|
rcu_read_lock();
|
|
for_each_fib6_node_rt_rcu(&table->tb6_root) {
|
|
struct net_device *dev = fib6_info_nh_dev(rt);
|
|
struct inet6_dev *idev = dev ? __in6_dev_get(dev) : NULL;
|
|
|
|
if (rt->fib6_flags & (RTF_DEFAULT | RTF_ADDRCONF) &&
|
|
(!idev || idev->cnf.accept_ra != 2) &&
|
|
fib6_info_hold_safe(rt)) {
|
|
rcu_read_unlock();
|
|
ip6_del_rt(net, rt);
|
|
goto restart;
|
|
}
|
|
}
|
|
rcu_read_unlock();
|
|
|
|
table->flags &= ~RT6_TABLE_HAS_DFLT_ROUTER;
|
|
}
|
|
|
|
void rt6_purge_dflt_routers(struct net *net)
|
|
{
|
|
struct fib6_table *table;
|
|
struct hlist_head *head;
|
|
unsigned int h;
|
|
|
|
rcu_read_lock();
|
|
|
|
for (h = 0; h < FIB6_TABLE_HASHSZ; h++) {
|
|
head = &net->ipv6.fib_table_hash[h];
|
|
hlist_for_each_entry_rcu(table, head, tb6_hlist) {
|
|
if (table->flags & RT6_TABLE_HAS_DFLT_ROUTER)
|
|
__rt6_purge_dflt_routers(net, table);
|
|
}
|
|
}
|
|
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
static void rtmsg_to_fib6_config(struct net *net,
|
|
struct in6_rtmsg *rtmsg,
|
|
struct fib6_config *cfg)
|
|
{
|
|
*cfg = (struct fib6_config){
|
|
.fc_table = l3mdev_fib_table_by_index(net, rtmsg->rtmsg_ifindex) ?
|
|
: RT6_TABLE_MAIN,
|
|
.fc_ifindex = rtmsg->rtmsg_ifindex,
|
|
.fc_metric = rtmsg->rtmsg_metric ? : IP6_RT_PRIO_USER,
|
|
.fc_expires = rtmsg->rtmsg_info,
|
|
.fc_dst_len = rtmsg->rtmsg_dst_len,
|
|
.fc_src_len = rtmsg->rtmsg_src_len,
|
|
.fc_flags = rtmsg->rtmsg_flags,
|
|
.fc_type = rtmsg->rtmsg_type,
|
|
|
|
.fc_nlinfo.nl_net = net,
|
|
|
|
.fc_dst = rtmsg->rtmsg_dst,
|
|
.fc_src = rtmsg->rtmsg_src,
|
|
.fc_gateway = rtmsg->rtmsg_gateway,
|
|
};
|
|
}
|
|
|
|
int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg)
|
|
{
|
|
struct fib6_config cfg;
|
|
struct in6_rtmsg rtmsg;
|
|
int err;
|
|
|
|
switch (cmd) {
|
|
case SIOCADDRT: /* Add a route */
|
|
case SIOCDELRT: /* Delete a route */
|
|
if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
|
|
return -EPERM;
|
|
err = copy_from_user(&rtmsg, arg,
|
|
sizeof(struct in6_rtmsg));
|
|
if (err)
|
|
return -EFAULT;
|
|
|
|
rtmsg_to_fib6_config(net, &rtmsg, &cfg);
|
|
|
|
rtnl_lock();
|
|
switch (cmd) {
|
|
case SIOCADDRT:
|
|
err = ip6_route_add(&cfg, GFP_KERNEL, NULL);
|
|
break;
|
|
case SIOCDELRT:
|
|
err = ip6_route_del(&cfg, NULL);
|
|
break;
|
|
default:
|
|
err = -EINVAL;
|
|
}
|
|
rtnl_unlock();
|
|
|
|
return err;
|
|
}
|
|
|
|
return -EINVAL;
|
|
}
|
|
|
|
/*
|
|
* Drop the packet on the floor
|
|
*/
|
|
|
|
static int ip6_pkt_drop(struct sk_buff *skb, u8 code, int ipstats_mib_noroutes)
|
|
{
|
|
int type;
|
|
struct dst_entry *dst = skb_dst(skb);
|
|
switch (ipstats_mib_noroutes) {
|
|
case IPSTATS_MIB_INNOROUTES:
|
|
type = ipv6_addr_type(&ipv6_hdr(skb)->daddr);
|
|
if (type == IPV6_ADDR_ANY) {
|
|
IP6_INC_STATS(dev_net(dst->dev),
|
|
__in6_dev_get_safely(skb->dev),
|
|
IPSTATS_MIB_INADDRERRORS);
|
|
break;
|
|
}
|
|
/* FALLTHROUGH */
|
|
case IPSTATS_MIB_OUTNOROUTES:
|
|
IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
|
|
ipstats_mib_noroutes);
|
|
break;
|
|
}
|
|
icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0);
|
|
kfree_skb(skb);
|
|
return 0;
|
|
}
|
|
|
|
static int ip6_pkt_discard(struct sk_buff *skb)
|
|
{
|
|
return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES);
|
|
}
|
|
|
|
static int ip6_pkt_discard_out(struct net *net, struct sock *sk, struct sk_buff *skb)
|
|
{
|
|
skb->dev = skb_dst(skb)->dev;
|
|
return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES);
|
|
}
|
|
|
|
static int ip6_pkt_prohibit(struct sk_buff *skb)
|
|
{
|
|
return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES);
|
|
}
|
|
|
|
static int ip6_pkt_prohibit_out(struct net *net, struct sock *sk, struct sk_buff *skb)
|
|
{
|
|
skb->dev = skb_dst(skb)->dev;
|
|
return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES);
|
|
}
|
|
|
|
/*
|
|
* Allocate a dst for local (unicast / anycast) address.
|
|
*/
|
|
|
|
struct fib6_info *addrconf_f6i_alloc(struct net *net,
|
|
struct inet6_dev *idev,
|
|
const struct in6_addr *addr,
|
|
bool anycast, gfp_t gfp_flags)
|
|
{
|
|
struct fib6_config cfg = {
|
|
.fc_table = l3mdev_fib_table(idev->dev) ? : RT6_TABLE_LOCAL,
|
|
.fc_ifindex = idev->dev->ifindex,
|
|
.fc_flags = RTF_UP | RTF_ADDRCONF | RTF_NONEXTHOP,
|
|
.fc_dst = *addr,
|
|
.fc_dst_len = 128,
|
|
.fc_protocol = RTPROT_KERNEL,
|
|
.fc_nlinfo.nl_net = net,
|
|
.fc_ignore_dev_down = true,
|
|
};
|
|
|
|
if (anycast) {
|
|
cfg.fc_type = RTN_ANYCAST;
|
|
cfg.fc_flags |= RTF_ANYCAST;
|
|
} else {
|
|
cfg.fc_type = RTN_LOCAL;
|
|
cfg.fc_flags |= RTF_LOCAL;
|
|
}
|
|
|
|
return ip6_route_info_create(&cfg, gfp_flags, NULL);
|
|
}
|
|
|
|
/* remove deleted ip from prefsrc entries */
|
|
struct arg_dev_net_ip {
|
|
struct net_device *dev;
|
|
struct net *net;
|
|
struct in6_addr *addr;
|
|
};
|
|
|
|
static int fib6_remove_prefsrc(struct fib6_info *rt, void *arg)
|
|
{
|
|
struct net_device *dev = ((struct arg_dev_net_ip *)arg)->dev;
|
|
struct net *net = ((struct arg_dev_net_ip *)arg)->net;
|
|
struct in6_addr *addr = ((struct arg_dev_net_ip *)arg)->addr;
|
|
|
|
if (((void *)rt->fib6_nh.fib_nh_dev == dev || !dev) &&
|
|
rt != net->ipv6.fib6_null_entry &&
|
|
ipv6_addr_equal(addr, &rt->fib6_prefsrc.addr)) {
|
|
spin_lock_bh(&rt6_exception_lock);
|
|
/* remove prefsrc entry */
|
|
rt->fib6_prefsrc.plen = 0;
|
|
spin_unlock_bh(&rt6_exception_lock);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
void rt6_remove_prefsrc(struct inet6_ifaddr *ifp)
|
|
{
|
|
struct net *net = dev_net(ifp->idev->dev);
|
|
struct arg_dev_net_ip adni = {
|
|
.dev = ifp->idev->dev,
|
|
.net = net,
|
|
.addr = &ifp->addr,
|
|
};
|
|
fib6_clean_all(net, fib6_remove_prefsrc, &adni);
|
|
}
|
|
|
|
#define RTF_RA_ROUTER (RTF_ADDRCONF | RTF_DEFAULT)
|
|
|
|
/* Remove routers and update dst entries when gateway turn into host. */
|
|
static int fib6_clean_tohost(struct fib6_info *rt, void *arg)
|
|
{
|
|
struct in6_addr *gateway = (struct in6_addr *)arg;
|
|
|
|
if (((rt->fib6_flags & RTF_RA_ROUTER) == RTF_RA_ROUTER) &&
|
|
rt->fib6_nh.fib_nh_gw_family &&
|
|
ipv6_addr_equal(gateway, &rt->fib6_nh.fib_nh_gw6)) {
|
|
return -1;
|
|
}
|
|
|
|
/* Further clean up cached routes in exception table.
|
|
* This is needed because cached route may have a different
|
|
* gateway than its 'parent' in the case of an ip redirect.
|
|
*/
|
|
rt6_exceptions_clean_tohost(rt, gateway);
|
|
|
|
return 0;
|
|
}
|
|
|
|
void rt6_clean_tohost(struct net *net, struct in6_addr *gateway)
|
|
{
|
|
fib6_clean_all(net, fib6_clean_tohost, gateway);
|
|
}
|
|
|
|
struct arg_netdev_event {
|
|
const struct net_device *dev;
|
|
union {
|
|
unsigned int nh_flags;
|
|
unsigned long event;
|
|
};
|
|
};
|
|
|
|
static struct fib6_info *rt6_multipath_first_sibling(const struct fib6_info *rt)
|
|
{
|
|
struct fib6_info *iter;
|
|
struct fib6_node *fn;
|
|
|
|
fn = rcu_dereference_protected(rt->fib6_node,
|
|
lockdep_is_held(&rt->fib6_table->tb6_lock));
|
|
iter = rcu_dereference_protected(fn->leaf,
|
|
lockdep_is_held(&rt->fib6_table->tb6_lock));
|
|
while (iter) {
|
|
if (iter->fib6_metric == rt->fib6_metric &&
|
|
rt6_qualify_for_ecmp(iter))
|
|
return iter;
|
|
iter = rcu_dereference_protected(iter->fib6_next,
|
|
lockdep_is_held(&rt->fib6_table->tb6_lock));
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static bool rt6_is_dead(const struct fib6_info *rt)
|
|
{
|
|
if (rt->fib6_nh.fib_nh_flags & RTNH_F_DEAD ||
|
|
(rt->fib6_nh.fib_nh_flags & RTNH_F_LINKDOWN &&
|
|
ip6_ignore_linkdown(rt->fib6_nh.fib_nh_dev)))
|
|
return true;
|
|
|
|
return false;
|
|
}
|
|
|
|
static int rt6_multipath_total_weight(const struct fib6_info *rt)
|
|
{
|
|
struct fib6_info *iter;
|
|
int total = 0;
|
|
|
|
if (!rt6_is_dead(rt))
|
|
total += rt->fib6_nh.fib_nh_weight;
|
|
|
|
list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings) {
|
|
if (!rt6_is_dead(iter))
|
|
total += iter->fib6_nh.fib_nh_weight;
|
|
}
|
|
|
|
return total;
|
|
}
|
|
|
|
static void rt6_upper_bound_set(struct fib6_info *rt, int *weight, int total)
|
|
{
|
|
int upper_bound = -1;
|
|
|
|
if (!rt6_is_dead(rt)) {
|
|
*weight += rt->fib6_nh.fib_nh_weight;
|
|
upper_bound = DIV_ROUND_CLOSEST_ULL((u64) (*weight) << 31,
|
|
total) - 1;
|
|
}
|
|
atomic_set(&rt->fib6_nh.fib_nh_upper_bound, upper_bound);
|
|
}
|
|
|
|
static void rt6_multipath_upper_bound_set(struct fib6_info *rt, int total)
|
|
{
|
|
struct fib6_info *iter;
|
|
int weight = 0;
|
|
|
|
rt6_upper_bound_set(rt, &weight, total);
|
|
|
|
list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings)
|
|
rt6_upper_bound_set(iter, &weight, total);
|
|
}
|
|
|
|
void rt6_multipath_rebalance(struct fib6_info *rt)
|
|
{
|
|
struct fib6_info *first;
|
|
int total;
|
|
|
|
/* In case the entire multipath route was marked for flushing,
|
|
* then there is no need to rebalance upon the removal of every
|
|
* sibling route.
|
|
*/
|
|
if (!rt->fib6_nsiblings || rt->should_flush)
|
|
return;
|
|
|
|
/* During lookup routes are evaluated in order, so we need to
|
|
* make sure upper bounds are assigned from the first sibling
|
|
* onwards.
|
|
*/
|
|
first = rt6_multipath_first_sibling(rt);
|
|
if (WARN_ON_ONCE(!first))
|
|
return;
|
|
|
|
total = rt6_multipath_total_weight(first);
|
|
rt6_multipath_upper_bound_set(first, total);
|
|
}
|
|
|
|
static int fib6_ifup(struct fib6_info *rt, void *p_arg)
|
|
{
|
|
const struct arg_netdev_event *arg = p_arg;
|
|
struct net *net = dev_net(arg->dev);
|
|
|
|
if (rt != net->ipv6.fib6_null_entry &&
|
|
rt->fib6_nh.fib_nh_dev == arg->dev) {
|
|
rt->fib6_nh.fib_nh_flags &= ~arg->nh_flags;
|
|
fib6_update_sernum_upto_root(net, rt);
|
|
rt6_multipath_rebalance(rt);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
void rt6_sync_up(struct net_device *dev, unsigned int nh_flags)
|
|
{
|
|
struct arg_netdev_event arg = {
|
|
.dev = dev,
|
|
{
|
|
.nh_flags = nh_flags,
|
|
},
|
|
};
|
|
|
|
if (nh_flags & RTNH_F_DEAD && netif_carrier_ok(dev))
|
|
arg.nh_flags |= RTNH_F_LINKDOWN;
|
|
|
|
fib6_clean_all(dev_net(dev), fib6_ifup, &arg);
|
|
}
|
|
|
|
static bool rt6_multipath_uses_dev(const struct fib6_info *rt,
|
|
const struct net_device *dev)
|
|
{
|
|
struct fib6_info *iter;
|
|
|
|
if (rt->fib6_nh.fib_nh_dev == dev)
|
|
return true;
|
|
list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings)
|
|
if (iter->fib6_nh.fib_nh_dev == dev)
|
|
return true;
|
|
|
|
return false;
|
|
}
|
|
|
|
static void rt6_multipath_flush(struct fib6_info *rt)
|
|
{
|
|
struct fib6_info *iter;
|
|
|
|
rt->should_flush = 1;
|
|
list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings)
|
|
iter->should_flush = 1;
|
|
}
|
|
|
|
static unsigned int rt6_multipath_dead_count(const struct fib6_info *rt,
|
|
const struct net_device *down_dev)
|
|
{
|
|
struct fib6_info *iter;
|
|
unsigned int dead = 0;
|
|
|
|
if (rt->fib6_nh.fib_nh_dev == down_dev ||
|
|
rt->fib6_nh.fib_nh_flags & RTNH_F_DEAD)
|
|
dead++;
|
|
list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings)
|
|
if (iter->fib6_nh.fib_nh_dev == down_dev ||
|
|
iter->fib6_nh.fib_nh_flags & RTNH_F_DEAD)
|
|
dead++;
|
|
|
|
return dead;
|
|
}
|
|
|
|
static void rt6_multipath_nh_flags_set(struct fib6_info *rt,
|
|
const struct net_device *dev,
|
|
unsigned int nh_flags)
|
|
{
|
|
struct fib6_info *iter;
|
|
|
|
if (rt->fib6_nh.fib_nh_dev == dev)
|
|
rt->fib6_nh.fib_nh_flags |= nh_flags;
|
|
list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings)
|
|
if (iter->fib6_nh.fib_nh_dev == dev)
|
|
iter->fib6_nh.fib_nh_flags |= nh_flags;
|
|
}
|
|
|
|
/* called with write lock held for table with rt */
|
|
static int fib6_ifdown(struct fib6_info *rt, void *p_arg)
|
|
{
|
|
const struct arg_netdev_event *arg = p_arg;
|
|
const struct net_device *dev = arg->dev;
|
|
struct net *net = dev_net(dev);
|
|
|
|
if (rt == net->ipv6.fib6_null_entry)
|
|
return 0;
|
|
|
|
switch (arg->event) {
|
|
case NETDEV_UNREGISTER:
|
|
return rt->fib6_nh.fib_nh_dev == dev ? -1 : 0;
|
|
case NETDEV_DOWN:
|
|
if (rt->should_flush)
|
|
return -1;
|
|
if (!rt->fib6_nsiblings)
|
|
return rt->fib6_nh.fib_nh_dev == dev ? -1 : 0;
|
|
if (rt6_multipath_uses_dev(rt, dev)) {
|
|
unsigned int count;
|
|
|
|
count = rt6_multipath_dead_count(rt, dev);
|
|
if (rt->fib6_nsiblings + 1 == count) {
|
|
rt6_multipath_flush(rt);
|
|
return -1;
|
|
}
|
|
rt6_multipath_nh_flags_set(rt, dev, RTNH_F_DEAD |
|
|
RTNH_F_LINKDOWN);
|
|
fib6_update_sernum(net, rt);
|
|
rt6_multipath_rebalance(rt);
|
|
}
|
|
return -2;
|
|
case NETDEV_CHANGE:
|
|
if (rt->fib6_nh.fib_nh_dev != dev ||
|
|
rt->fib6_flags & (RTF_LOCAL | RTF_ANYCAST))
|
|
break;
|
|
rt->fib6_nh.fib_nh_flags |= RTNH_F_LINKDOWN;
|
|
rt6_multipath_rebalance(rt);
|
|
break;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
void rt6_sync_down_dev(struct net_device *dev, unsigned long event)
|
|
{
|
|
struct arg_netdev_event arg = {
|
|
.dev = dev,
|
|
{
|
|
.event = event,
|
|
},
|
|
};
|
|
struct net *net = dev_net(dev);
|
|
|
|
if (net->ipv6.sysctl.skip_notify_on_dev_down)
|
|
fib6_clean_all_skip_notify(net, fib6_ifdown, &arg);
|
|
else
|
|
fib6_clean_all(net, fib6_ifdown, &arg);
|
|
}
|
|
|
|
void rt6_disable_ip(struct net_device *dev, unsigned long event)
|
|
{
|
|
rt6_sync_down_dev(dev, event);
|
|
rt6_uncached_list_flush_dev(dev_net(dev), dev);
|
|
neigh_ifdown(&nd_tbl, dev);
|
|
}
|
|
|
|
struct rt6_mtu_change_arg {
|
|
struct net_device *dev;
|
|
unsigned int mtu;
|
|
};
|
|
|
|
static int rt6_mtu_change_route(struct fib6_info *rt, void *p_arg)
|
|
{
|
|
struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg;
|
|
struct inet6_dev *idev;
|
|
|
|
/* In IPv6 pmtu discovery is not optional,
|
|
so that RTAX_MTU lock cannot disable it.
|
|
We still use this lock to block changes
|
|
caused by addrconf/ndisc.
|
|
*/
|
|
|
|
idev = __in6_dev_get(arg->dev);
|
|
if (!idev)
|
|
return 0;
|
|
|
|
/* For administrative MTU increase, there is no way to discover
|
|
IPv6 PMTU increase, so PMTU increase should be updated here.
|
|
Since RFC 1981 doesn't include administrative MTU increase
|
|
update PMTU increase is a MUST. (i.e. jumbo frame)
|
|
*/
|
|
if (rt->fib6_nh.fib_nh_dev == arg->dev &&
|
|
!fib6_metric_locked(rt, RTAX_MTU)) {
|
|
u32 mtu = rt->fib6_pmtu;
|
|
|
|
if (mtu >= arg->mtu ||
|
|
(mtu < arg->mtu && mtu == idev->cnf.mtu6))
|
|
fib6_metric_set(rt, RTAX_MTU, arg->mtu);
|
|
|
|
spin_lock_bh(&rt6_exception_lock);
|
|
rt6_exceptions_update_pmtu(idev, rt, arg->mtu);
|
|
spin_unlock_bh(&rt6_exception_lock);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
void rt6_mtu_change(struct net_device *dev, unsigned int mtu)
|
|
{
|
|
struct rt6_mtu_change_arg arg = {
|
|
.dev = dev,
|
|
.mtu = mtu,
|
|
};
|
|
|
|
fib6_clean_all(dev_net(dev), rt6_mtu_change_route, &arg);
|
|
}
|
|
|
|
static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = {
|
|
[RTA_GATEWAY] = { .len = sizeof(struct in6_addr) },
|
|
[RTA_PREFSRC] = { .len = sizeof(struct in6_addr) },
|
|
[RTA_OIF] = { .type = NLA_U32 },
|
|
[RTA_IIF] = { .type = NLA_U32 },
|
|
[RTA_PRIORITY] = { .type = NLA_U32 },
|
|
[RTA_METRICS] = { .type = NLA_NESTED },
|
|
[RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) },
|
|
[RTA_PREF] = { .type = NLA_U8 },
|
|
[RTA_ENCAP_TYPE] = { .type = NLA_U16 },
|
|
[RTA_ENCAP] = { .type = NLA_NESTED },
|
|
[RTA_EXPIRES] = { .type = NLA_U32 },
|
|
[RTA_UID] = { .type = NLA_U32 },
|
|
[RTA_MARK] = { .type = NLA_U32 },
|
|
[RTA_TABLE] = { .type = NLA_U32 },
|
|
[RTA_IP_PROTO] = { .type = NLA_U8 },
|
|
[RTA_SPORT] = { .type = NLA_U16 },
|
|
[RTA_DPORT] = { .type = NLA_U16 },
|
|
};
|
|
|
|
static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh,
|
|
struct fib6_config *cfg,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
struct rtmsg *rtm;
|
|
struct nlattr *tb[RTA_MAX+1];
|
|
unsigned int pref;
|
|
int err;
|
|
|
|
err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy,
|
|
extack);
|
|
if (err < 0)
|
|
goto errout;
|
|
|
|
err = -EINVAL;
|
|
rtm = nlmsg_data(nlh);
|
|
|
|
*cfg = (struct fib6_config){
|
|
.fc_table = rtm->rtm_table,
|
|
.fc_dst_len = rtm->rtm_dst_len,
|
|
.fc_src_len = rtm->rtm_src_len,
|
|
.fc_flags = RTF_UP,
|
|
.fc_protocol = rtm->rtm_protocol,
|
|
.fc_type = rtm->rtm_type,
|
|
|
|
.fc_nlinfo.portid = NETLINK_CB(skb).portid,
|
|
.fc_nlinfo.nlh = nlh,
|
|
.fc_nlinfo.nl_net = sock_net(skb->sk),
|
|
};
|
|
|
|
if (rtm->rtm_type == RTN_UNREACHABLE ||
|
|
rtm->rtm_type == RTN_BLACKHOLE ||
|
|
rtm->rtm_type == RTN_PROHIBIT ||
|
|
rtm->rtm_type == RTN_THROW)
|
|
cfg->fc_flags |= RTF_REJECT;
|
|
|
|
if (rtm->rtm_type == RTN_LOCAL)
|
|
cfg->fc_flags |= RTF_LOCAL;
|
|
|
|
if (rtm->rtm_flags & RTM_F_CLONED)
|
|
cfg->fc_flags |= RTF_CACHE;
|
|
|
|
cfg->fc_flags |= (rtm->rtm_flags & RTNH_F_ONLINK);
|
|
|
|
if (tb[RTA_GATEWAY]) {
|
|
cfg->fc_gateway = nla_get_in6_addr(tb[RTA_GATEWAY]);
|
|
cfg->fc_flags |= RTF_GATEWAY;
|
|
}
|
|
if (tb[RTA_VIA]) {
|
|
NL_SET_ERR_MSG(extack, "IPv6 does not support RTA_VIA attribute");
|
|
goto errout;
|
|
}
|
|
|
|
if (tb[RTA_DST]) {
|
|
int plen = (rtm->rtm_dst_len + 7) >> 3;
|
|
|
|
if (nla_len(tb[RTA_DST]) < plen)
|
|
goto errout;
|
|
|
|
nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen);
|
|
}
|
|
|
|
if (tb[RTA_SRC]) {
|
|
int plen = (rtm->rtm_src_len + 7) >> 3;
|
|
|
|
if (nla_len(tb[RTA_SRC]) < plen)
|
|
goto errout;
|
|
|
|
nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen);
|
|
}
|
|
|
|
if (tb[RTA_PREFSRC])
|
|
cfg->fc_prefsrc = nla_get_in6_addr(tb[RTA_PREFSRC]);
|
|
|
|
if (tb[RTA_OIF])
|
|
cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]);
|
|
|
|
if (tb[RTA_PRIORITY])
|
|
cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]);
|
|
|
|
if (tb[RTA_METRICS]) {
|
|
cfg->fc_mx = nla_data(tb[RTA_METRICS]);
|
|
cfg->fc_mx_len = nla_len(tb[RTA_METRICS]);
|
|
}
|
|
|
|
if (tb[RTA_TABLE])
|
|
cfg->fc_table = nla_get_u32(tb[RTA_TABLE]);
|
|
|
|
if (tb[RTA_MULTIPATH]) {
|
|
cfg->fc_mp = nla_data(tb[RTA_MULTIPATH]);
|
|
cfg->fc_mp_len = nla_len(tb[RTA_MULTIPATH]);
|
|
|
|
err = lwtunnel_valid_encap_type_attr(cfg->fc_mp,
|
|
cfg->fc_mp_len, extack);
|
|
if (err < 0)
|
|
goto errout;
|
|
}
|
|
|
|
if (tb[RTA_PREF]) {
|
|
pref = nla_get_u8(tb[RTA_PREF]);
|
|
if (pref != ICMPV6_ROUTER_PREF_LOW &&
|
|
pref != ICMPV6_ROUTER_PREF_HIGH)
|
|
pref = ICMPV6_ROUTER_PREF_MEDIUM;
|
|
cfg->fc_flags |= RTF_PREF(pref);
|
|
}
|
|
|
|
if (tb[RTA_ENCAP])
|
|
cfg->fc_encap = tb[RTA_ENCAP];
|
|
|
|
if (tb[RTA_ENCAP_TYPE]) {
|
|
cfg->fc_encap_type = nla_get_u16(tb[RTA_ENCAP_TYPE]);
|
|
|
|
err = lwtunnel_valid_encap_type(cfg->fc_encap_type, extack);
|
|
if (err < 0)
|
|
goto errout;
|
|
}
|
|
|
|
if (tb[RTA_EXPIRES]) {
|
|
unsigned long timeout = addrconf_timeout_fixup(nla_get_u32(tb[RTA_EXPIRES]), HZ);
|
|
|
|
if (addrconf_finite_timeout(timeout)) {
|
|
cfg->fc_expires = jiffies_to_clock_t(timeout * HZ);
|
|
cfg->fc_flags |= RTF_EXPIRES;
|
|
}
|
|
}
|
|
|
|
err = 0;
|
|
errout:
|
|
return err;
|
|
}
|
|
|
|
struct rt6_nh {
|
|
struct fib6_info *fib6_info;
|
|
struct fib6_config r_cfg;
|
|
struct list_head next;
|
|
};
|
|
|
|
static int ip6_route_info_append(struct net *net,
|
|
struct list_head *rt6_nh_list,
|
|
struct fib6_info *rt,
|
|
struct fib6_config *r_cfg)
|
|
{
|
|
struct rt6_nh *nh;
|
|
int err = -EEXIST;
|
|
|
|
list_for_each_entry(nh, rt6_nh_list, next) {
|
|
/* check if fib6_info already exists */
|
|
if (rt6_duplicate_nexthop(nh->fib6_info, rt))
|
|
return err;
|
|
}
|
|
|
|
nh = kzalloc(sizeof(*nh), GFP_KERNEL);
|
|
if (!nh)
|
|
return -ENOMEM;
|
|
nh->fib6_info = rt;
|
|
memcpy(&nh->r_cfg, r_cfg, sizeof(*r_cfg));
|
|
list_add_tail(&nh->next, rt6_nh_list);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void ip6_route_mpath_notify(struct fib6_info *rt,
|
|
struct fib6_info *rt_last,
|
|
struct nl_info *info,
|
|
__u16 nlflags)
|
|
{
|
|
/* if this is an APPEND route, then rt points to the first route
|
|
* inserted and rt_last points to last route inserted. Userspace
|
|
* wants a consistent dump of the route which starts at the first
|
|
* nexthop. Since sibling routes are always added at the end of
|
|
* the list, find the first sibling of the last route appended
|
|
*/
|
|
if ((nlflags & NLM_F_APPEND) && rt_last && rt_last->fib6_nsiblings) {
|
|
rt = list_first_entry(&rt_last->fib6_siblings,
|
|
struct fib6_info,
|
|
fib6_siblings);
|
|
}
|
|
|
|
if (rt)
|
|
inet6_rt_notify(RTM_NEWROUTE, rt, info, nlflags);
|
|
}
|
|
|
|
static int ip6_route_multipath_add(struct fib6_config *cfg,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
struct fib6_info *rt_notif = NULL, *rt_last = NULL;
|
|
struct nl_info *info = &cfg->fc_nlinfo;
|
|
struct fib6_config r_cfg;
|
|
struct rtnexthop *rtnh;
|
|
struct fib6_info *rt;
|
|
struct rt6_nh *err_nh;
|
|
struct rt6_nh *nh, *nh_safe;
|
|
__u16 nlflags;
|
|
int remaining;
|
|
int attrlen;
|
|
int err = 1;
|
|
int nhn = 0;
|
|
int replace = (cfg->fc_nlinfo.nlh &&
|
|
(cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_REPLACE));
|
|
LIST_HEAD(rt6_nh_list);
|
|
|
|
nlflags = replace ? NLM_F_REPLACE : NLM_F_CREATE;
|
|
if (info->nlh && info->nlh->nlmsg_flags & NLM_F_APPEND)
|
|
nlflags |= NLM_F_APPEND;
|
|
|
|
remaining = cfg->fc_mp_len;
|
|
rtnh = (struct rtnexthop *)cfg->fc_mp;
|
|
|
|
/* Parse a Multipath Entry and build a list (rt6_nh_list) of
|
|
* fib6_info structs per nexthop
|
|
*/
|
|
while (rtnh_ok(rtnh, remaining)) {
|
|
memcpy(&r_cfg, cfg, sizeof(*cfg));
|
|
if (rtnh->rtnh_ifindex)
|
|
r_cfg.fc_ifindex = rtnh->rtnh_ifindex;
|
|
|
|
attrlen = rtnh_attrlen(rtnh);
|
|
if (attrlen > 0) {
|
|
struct nlattr *nla, *attrs = rtnh_attrs(rtnh);
|
|
|
|
nla = nla_find(attrs, attrlen, RTA_GATEWAY);
|
|
if (nla) {
|
|
r_cfg.fc_gateway = nla_get_in6_addr(nla);
|
|
r_cfg.fc_flags |= RTF_GATEWAY;
|
|
}
|
|
r_cfg.fc_encap = nla_find(attrs, attrlen, RTA_ENCAP);
|
|
nla = nla_find(attrs, attrlen, RTA_ENCAP_TYPE);
|
|
if (nla)
|
|
r_cfg.fc_encap_type = nla_get_u16(nla);
|
|
}
|
|
|
|
r_cfg.fc_flags |= (rtnh->rtnh_flags & RTNH_F_ONLINK);
|
|
rt = ip6_route_info_create(&r_cfg, GFP_KERNEL, extack);
|
|
if (IS_ERR(rt)) {
|
|
err = PTR_ERR(rt);
|
|
rt = NULL;
|
|
goto cleanup;
|
|
}
|
|
if (!rt6_qualify_for_ecmp(rt)) {
|
|
err = -EINVAL;
|
|
NL_SET_ERR_MSG(extack,
|
|
"Device only routes can not be added for IPv6 using the multipath API.");
|
|
fib6_info_release(rt);
|
|
goto cleanup;
|
|
}
|
|
|
|
rt->fib6_nh.fib_nh_weight = rtnh->rtnh_hops + 1;
|
|
|
|
err = ip6_route_info_append(info->nl_net, &rt6_nh_list,
|
|
rt, &r_cfg);
|
|
if (err) {
|
|
fib6_info_release(rt);
|
|
goto cleanup;
|
|
}
|
|
|
|
rtnh = rtnh_next(rtnh, &remaining);
|
|
}
|
|
|
|
/* for add and replace send one notification with all nexthops.
|
|
* Skip the notification in fib6_add_rt2node and send one with
|
|
* the full route when done
|
|
*/
|
|
info->skip_notify = 1;
|
|
|
|
err_nh = NULL;
|
|
list_for_each_entry(nh, &rt6_nh_list, next) {
|
|
err = __ip6_ins_rt(nh->fib6_info, info, extack);
|
|
fib6_info_release(nh->fib6_info);
|
|
|
|
if (!err) {
|
|
/* save reference to last route successfully inserted */
|
|
rt_last = nh->fib6_info;
|
|
|
|
/* save reference to first route for notification */
|
|
if (!rt_notif)
|
|
rt_notif = nh->fib6_info;
|
|
}
|
|
|
|
/* nh->fib6_info is used or freed at this point, reset to NULL*/
|
|
nh->fib6_info = NULL;
|
|
if (err) {
|
|
if (replace && nhn)
|
|
NL_SET_ERR_MSG_MOD(extack,
|
|
"multipath route replace failed (check consistency of installed routes)");
|
|
err_nh = nh;
|
|
goto add_errout;
|
|
}
|
|
|
|
/* Because each route is added like a single route we remove
|
|
* these flags after the first nexthop: if there is a collision,
|
|
* we have already failed to add the first nexthop:
|
|
* fib6_add_rt2node() has rejected it; when replacing, old
|
|
* nexthops have been replaced by first new, the rest should
|
|
* be added to it.
|
|
*/
|
|
cfg->fc_nlinfo.nlh->nlmsg_flags &= ~(NLM_F_EXCL |
|
|
NLM_F_REPLACE);
|
|
nhn++;
|
|
}
|
|
|
|
/* success ... tell user about new route */
|
|
ip6_route_mpath_notify(rt_notif, rt_last, info, nlflags);
|
|
goto cleanup;
|
|
|
|
add_errout:
|
|
/* send notification for routes that were added so that
|
|
* the delete notifications sent by ip6_route_del are
|
|
* coherent
|
|
*/
|
|
if (rt_notif)
|
|
ip6_route_mpath_notify(rt_notif, rt_last, info, nlflags);
|
|
|
|
/* Delete routes that were already added */
|
|
list_for_each_entry(nh, &rt6_nh_list, next) {
|
|
if (err_nh == nh)
|
|
break;
|
|
ip6_route_del(&nh->r_cfg, extack);
|
|
}
|
|
|
|
cleanup:
|
|
list_for_each_entry_safe(nh, nh_safe, &rt6_nh_list, next) {
|
|
if (nh->fib6_info)
|
|
fib6_info_release(nh->fib6_info);
|
|
list_del(&nh->next);
|
|
kfree(nh);
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
static int ip6_route_multipath_del(struct fib6_config *cfg,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
struct fib6_config r_cfg;
|
|
struct rtnexthop *rtnh;
|
|
int remaining;
|
|
int attrlen;
|
|
int err = 1, last_err = 0;
|
|
|
|
remaining = cfg->fc_mp_len;
|
|
rtnh = (struct rtnexthop *)cfg->fc_mp;
|
|
|
|
/* Parse a Multipath Entry */
|
|
while (rtnh_ok(rtnh, remaining)) {
|
|
memcpy(&r_cfg, cfg, sizeof(*cfg));
|
|
if (rtnh->rtnh_ifindex)
|
|
r_cfg.fc_ifindex = rtnh->rtnh_ifindex;
|
|
|
|
attrlen = rtnh_attrlen(rtnh);
|
|
if (attrlen > 0) {
|
|
struct nlattr *nla, *attrs = rtnh_attrs(rtnh);
|
|
|
|
nla = nla_find(attrs, attrlen, RTA_GATEWAY);
|
|
if (nla) {
|
|
nla_memcpy(&r_cfg.fc_gateway, nla, 16);
|
|
r_cfg.fc_flags |= RTF_GATEWAY;
|
|
}
|
|
}
|
|
err = ip6_route_del(&r_cfg, extack);
|
|
if (err)
|
|
last_err = err;
|
|
|
|
rtnh = rtnh_next(rtnh, &remaining);
|
|
}
|
|
|
|
return last_err;
|
|
}
|
|
|
|
static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
struct fib6_config cfg;
|
|
int err;
|
|
|
|
err = rtm_to_fib6_config(skb, nlh, &cfg, extack);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
if (cfg.fc_mp)
|
|
return ip6_route_multipath_del(&cfg, extack);
|
|
else {
|
|
cfg.fc_delete_all_nh = 1;
|
|
return ip6_route_del(&cfg, extack);
|
|
}
|
|
}
|
|
|
|
static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
struct fib6_config cfg;
|
|
int err;
|
|
|
|
err = rtm_to_fib6_config(skb, nlh, &cfg, extack);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
if (cfg.fc_metric == 0)
|
|
cfg.fc_metric = IP6_RT_PRIO_USER;
|
|
|
|
if (cfg.fc_mp)
|
|
return ip6_route_multipath_add(&cfg, extack);
|
|
else
|
|
return ip6_route_add(&cfg, GFP_KERNEL, extack);
|
|
}
|
|
|
|
static size_t rt6_nlmsg_size(struct fib6_info *rt)
|
|
{
|
|
int nexthop_len = 0;
|
|
|
|
if (rt->fib6_nsiblings) {
|
|
nexthop_len = nla_total_size(0) /* RTA_MULTIPATH */
|
|
+ NLA_ALIGN(sizeof(struct rtnexthop))
|
|
+ nla_total_size(16) /* RTA_GATEWAY */
|
|
+ lwtunnel_get_encap_size(rt->fib6_nh.fib_nh_lws);
|
|
|
|
nexthop_len *= rt->fib6_nsiblings;
|
|
}
|
|
|
|
return NLMSG_ALIGN(sizeof(struct rtmsg))
|
|
+ nla_total_size(16) /* RTA_SRC */
|
|
+ nla_total_size(16) /* RTA_DST */
|
|
+ nla_total_size(16) /* RTA_GATEWAY */
|
|
+ nla_total_size(16) /* RTA_PREFSRC */
|
|
+ nla_total_size(4) /* RTA_TABLE */
|
|
+ nla_total_size(4) /* RTA_IIF */
|
|
+ nla_total_size(4) /* RTA_OIF */
|
|
+ nla_total_size(4) /* RTA_PRIORITY */
|
|
+ RTAX_MAX * nla_total_size(4) /* RTA_METRICS */
|
|
+ nla_total_size(sizeof(struct rta_cacheinfo))
|
|
+ nla_total_size(TCP_CA_NAME_MAX) /* RTAX_CC_ALGO */
|
|
+ nla_total_size(1) /* RTA_PREF */
|
|
+ lwtunnel_get_encap_size(rt->fib6_nh.fib_nh_lws)
|
|
+ nexthop_len;
|
|
}
|
|
|
|
static int rt6_fill_node(struct net *net, struct sk_buff *skb,
|
|
struct fib6_info *rt, struct dst_entry *dst,
|
|
struct in6_addr *dest, struct in6_addr *src,
|
|
int iif, int type, u32 portid, u32 seq,
|
|
unsigned int flags)
|
|
{
|
|
struct rt6_info *rt6 = (struct rt6_info *)dst;
|
|
struct rt6key *rt6_dst, *rt6_src;
|
|
u32 *pmetrics, table, rt6_flags;
|
|
struct nlmsghdr *nlh;
|
|
struct rtmsg *rtm;
|
|
long expires = 0;
|
|
|
|
nlh = nlmsg_put(skb, portid, seq, type, sizeof(*rtm), flags);
|
|
if (!nlh)
|
|
return -EMSGSIZE;
|
|
|
|
if (rt6) {
|
|
rt6_dst = &rt6->rt6i_dst;
|
|
rt6_src = &rt6->rt6i_src;
|
|
rt6_flags = rt6->rt6i_flags;
|
|
} else {
|
|
rt6_dst = &rt->fib6_dst;
|
|
rt6_src = &rt->fib6_src;
|
|
rt6_flags = rt->fib6_flags;
|
|
}
|
|
|
|
rtm = nlmsg_data(nlh);
|
|
rtm->rtm_family = AF_INET6;
|
|
rtm->rtm_dst_len = rt6_dst->plen;
|
|
rtm->rtm_src_len = rt6_src->plen;
|
|
rtm->rtm_tos = 0;
|
|
if (rt->fib6_table)
|
|
table = rt->fib6_table->tb6_id;
|
|
else
|
|
table = RT6_TABLE_UNSPEC;
|
|
rtm->rtm_table = table < 256 ? table : RT_TABLE_COMPAT;
|
|
if (nla_put_u32(skb, RTA_TABLE, table))
|
|
goto nla_put_failure;
|
|
|
|
rtm->rtm_type = rt->fib6_type;
|
|
rtm->rtm_flags = 0;
|
|
rtm->rtm_scope = RT_SCOPE_UNIVERSE;
|
|
rtm->rtm_protocol = rt->fib6_protocol;
|
|
|
|
if (rt6_flags & RTF_CACHE)
|
|
rtm->rtm_flags |= RTM_F_CLONED;
|
|
|
|
if (dest) {
|
|
if (nla_put_in6_addr(skb, RTA_DST, dest))
|
|
goto nla_put_failure;
|
|
rtm->rtm_dst_len = 128;
|
|
} else if (rtm->rtm_dst_len)
|
|
if (nla_put_in6_addr(skb, RTA_DST, &rt6_dst->addr))
|
|
goto nla_put_failure;
|
|
#ifdef CONFIG_IPV6_SUBTREES
|
|
if (src) {
|
|
if (nla_put_in6_addr(skb, RTA_SRC, src))
|
|
goto nla_put_failure;
|
|
rtm->rtm_src_len = 128;
|
|
} else if (rtm->rtm_src_len &&
|
|
nla_put_in6_addr(skb, RTA_SRC, &rt6_src->addr))
|
|
goto nla_put_failure;
|
|
#endif
|
|
if (iif) {
|
|
#ifdef CONFIG_IPV6_MROUTE
|
|
if (ipv6_addr_is_multicast(&rt6_dst->addr)) {
|
|
int err = ip6mr_get_route(net, skb, rtm, portid);
|
|
|
|
if (err == 0)
|
|
return 0;
|
|
if (err < 0)
|
|
goto nla_put_failure;
|
|
} else
|
|
#endif
|
|
if (nla_put_u32(skb, RTA_IIF, iif))
|
|
goto nla_put_failure;
|
|
} else if (dest) {
|
|
struct in6_addr saddr_buf;
|
|
if (ip6_route_get_saddr(net, rt, dest, 0, &saddr_buf) == 0 &&
|
|
nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf))
|
|
goto nla_put_failure;
|
|
}
|
|
|
|
if (rt->fib6_prefsrc.plen) {
|
|
struct in6_addr saddr_buf;
|
|
saddr_buf = rt->fib6_prefsrc.addr;
|
|
if (nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf))
|
|
goto nla_put_failure;
|
|
}
|
|
|
|
pmetrics = dst ? dst_metrics_ptr(dst) : rt->fib6_metrics->metrics;
|
|
if (rtnetlink_put_metrics(skb, pmetrics) < 0)
|
|
goto nla_put_failure;
|
|
|
|
if (nla_put_u32(skb, RTA_PRIORITY, rt->fib6_metric))
|
|
goto nla_put_failure;
|
|
|
|
/* For multipath routes, walk the siblings list and add
|
|
* each as a nexthop within RTA_MULTIPATH.
|
|
*/
|
|
if (rt6) {
|
|
if (rt6_flags & RTF_GATEWAY &&
|
|
nla_put_in6_addr(skb, RTA_GATEWAY, &rt6->rt6i_gateway))
|
|
goto nla_put_failure;
|
|
|
|
if (dst->dev && nla_put_u32(skb, RTA_OIF, dst->dev->ifindex))
|
|
goto nla_put_failure;
|
|
} else if (rt->fib6_nsiblings) {
|
|
struct fib6_info *sibling, *next_sibling;
|
|
struct nlattr *mp;
|
|
|
|
mp = nla_nest_start(skb, RTA_MULTIPATH);
|
|
if (!mp)
|
|
goto nla_put_failure;
|
|
|
|
if (fib_add_nexthop(skb, &rt->fib6_nh.nh_common,
|
|
rt->fib6_nh.fib_nh_weight) < 0)
|
|
goto nla_put_failure;
|
|
|
|
list_for_each_entry_safe(sibling, next_sibling,
|
|
&rt->fib6_siblings, fib6_siblings) {
|
|
if (fib_add_nexthop(skb, &sibling->fib6_nh.nh_common,
|
|
sibling->fib6_nh.fib_nh_weight) < 0)
|
|
goto nla_put_failure;
|
|
}
|
|
|
|
nla_nest_end(skb, mp);
|
|
} else {
|
|
if (fib_nexthop_info(skb, &rt->fib6_nh.nh_common,
|
|
&rtm->rtm_flags, false) < 0)
|
|
goto nla_put_failure;
|
|
}
|
|
|
|
if (rt6_flags & RTF_EXPIRES) {
|
|
expires = dst ? dst->expires : rt->expires;
|
|
expires -= jiffies;
|
|
}
|
|
|
|
if (rtnl_put_cacheinfo(skb, dst, 0, expires, dst ? dst->error : 0) < 0)
|
|
goto nla_put_failure;
|
|
|
|
if (nla_put_u8(skb, RTA_PREF, IPV6_EXTRACT_PREF(rt6_flags)))
|
|
goto nla_put_failure;
|
|
|
|
|
|
nlmsg_end(skb, nlh);
|
|
return 0;
|
|
|
|
nla_put_failure:
|
|
nlmsg_cancel(skb, nlh);
|
|
return -EMSGSIZE;
|
|
}
|
|
|
|
static bool fib6_info_uses_dev(const struct fib6_info *f6i,
|
|
const struct net_device *dev)
|
|
{
|
|
if (f6i->fib6_nh.fib_nh_dev == dev)
|
|
return true;
|
|
|
|
if (f6i->fib6_nsiblings) {
|
|
struct fib6_info *sibling, *next_sibling;
|
|
|
|
list_for_each_entry_safe(sibling, next_sibling,
|
|
&f6i->fib6_siblings, fib6_siblings) {
|
|
if (sibling->fib6_nh.fib_nh_dev == dev)
|
|
return true;
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
int rt6_dump_route(struct fib6_info *rt, void *p_arg)
|
|
{
|
|
struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg;
|
|
struct fib_dump_filter *filter = &arg->filter;
|
|
unsigned int flags = NLM_F_MULTI;
|
|
struct net *net = arg->net;
|
|
|
|
if (rt == net->ipv6.fib6_null_entry)
|
|
return 0;
|
|
|
|
if ((filter->flags & RTM_F_PREFIX) &&
|
|
!(rt->fib6_flags & RTF_PREFIX_RT)) {
|
|
/* success since this is not a prefix route */
|
|
return 1;
|
|
}
|
|
if (filter->filter_set) {
|
|
if ((filter->rt_type && rt->fib6_type != filter->rt_type) ||
|
|
(filter->dev && !fib6_info_uses_dev(rt, filter->dev)) ||
|
|
(filter->protocol && rt->fib6_protocol != filter->protocol)) {
|
|
return 1;
|
|
}
|
|
flags |= NLM_F_DUMP_FILTERED;
|
|
}
|
|
|
|
return rt6_fill_node(net, arg->skb, rt, NULL, NULL, NULL, 0,
|
|
RTM_NEWROUTE, NETLINK_CB(arg->cb->skb).portid,
|
|
arg->cb->nlh->nlmsg_seq, flags);
|
|
}
|
|
|
|
static int inet6_rtm_valid_getroute_req(struct sk_buff *skb,
|
|
const struct nlmsghdr *nlh,
|
|
struct nlattr **tb,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
struct rtmsg *rtm;
|
|
int i, err;
|
|
|
|
if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*rtm))) {
|
|
NL_SET_ERR_MSG_MOD(extack,
|
|
"Invalid header for get route request");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (!netlink_strict_get_check(skb))
|
|
return nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX,
|
|
rtm_ipv6_policy, extack);
|
|
|
|
rtm = nlmsg_data(nlh);
|
|
if ((rtm->rtm_src_len && rtm->rtm_src_len != 128) ||
|
|
(rtm->rtm_dst_len && rtm->rtm_dst_len != 128) ||
|
|
rtm->rtm_table || rtm->rtm_protocol || rtm->rtm_scope ||
|
|
rtm->rtm_type) {
|
|
NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for get route request");
|
|
return -EINVAL;
|
|
}
|
|
if (rtm->rtm_flags & ~RTM_F_FIB_MATCH) {
|
|
NL_SET_ERR_MSG_MOD(extack,
|
|
"Invalid flags for get route request");
|
|
return -EINVAL;
|
|
}
|
|
|
|
err = nlmsg_parse_strict(nlh, sizeof(*rtm), tb, RTA_MAX,
|
|
rtm_ipv6_policy, extack);
|
|
if (err)
|
|
return err;
|
|
|
|
if ((tb[RTA_SRC] && !rtm->rtm_src_len) ||
|
|
(tb[RTA_DST] && !rtm->rtm_dst_len)) {
|
|
NL_SET_ERR_MSG_MOD(extack, "rtm_src_len and rtm_dst_len must be 128 for IPv6");
|
|
return -EINVAL;
|
|
}
|
|
|
|
for (i = 0; i <= RTA_MAX; i++) {
|
|
if (!tb[i])
|
|
continue;
|
|
|
|
switch (i) {
|
|
case RTA_SRC:
|
|
case RTA_DST:
|
|
case RTA_IIF:
|
|
case RTA_OIF:
|
|
case RTA_MARK:
|
|
case RTA_UID:
|
|
case RTA_SPORT:
|
|
case RTA_DPORT:
|
|
case RTA_IP_PROTO:
|
|
break;
|
|
default:
|
|
NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in get route request");
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
struct net *net = sock_net(in_skb->sk);
|
|
struct nlattr *tb[RTA_MAX+1];
|
|
int err, iif = 0, oif = 0;
|
|
struct fib6_info *from;
|
|
struct dst_entry *dst;
|
|
struct rt6_info *rt;
|
|
struct sk_buff *skb;
|
|
struct rtmsg *rtm;
|
|
struct flowi6 fl6 = {};
|
|
bool fibmatch;
|
|
|
|
err = inet6_rtm_valid_getroute_req(in_skb, nlh, tb, extack);
|
|
if (err < 0)
|
|
goto errout;
|
|
|
|
err = -EINVAL;
|
|
rtm = nlmsg_data(nlh);
|
|
fl6.flowlabel = ip6_make_flowinfo(rtm->rtm_tos, 0);
|
|
fibmatch = !!(rtm->rtm_flags & RTM_F_FIB_MATCH);
|
|
|
|
if (tb[RTA_SRC]) {
|
|
if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr))
|
|
goto errout;
|
|
|
|
fl6.saddr = *(struct in6_addr *)nla_data(tb[RTA_SRC]);
|
|
}
|
|
|
|
if (tb[RTA_DST]) {
|
|
if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr))
|
|
goto errout;
|
|
|
|
fl6.daddr = *(struct in6_addr *)nla_data(tb[RTA_DST]);
|
|
}
|
|
|
|
if (tb[RTA_IIF])
|
|
iif = nla_get_u32(tb[RTA_IIF]);
|
|
|
|
if (tb[RTA_OIF])
|
|
oif = nla_get_u32(tb[RTA_OIF]);
|
|
|
|
if (tb[RTA_MARK])
|
|
fl6.flowi6_mark = nla_get_u32(tb[RTA_MARK]);
|
|
|
|
if (tb[RTA_UID])
|
|
fl6.flowi6_uid = make_kuid(current_user_ns(),
|
|
nla_get_u32(tb[RTA_UID]));
|
|
else
|
|
fl6.flowi6_uid = iif ? INVALID_UID : current_uid();
|
|
|
|
if (tb[RTA_SPORT])
|
|
fl6.fl6_sport = nla_get_be16(tb[RTA_SPORT]);
|
|
|
|
if (tb[RTA_DPORT])
|
|
fl6.fl6_dport = nla_get_be16(tb[RTA_DPORT]);
|
|
|
|
if (tb[RTA_IP_PROTO]) {
|
|
err = rtm_getroute_parse_ip_proto(tb[RTA_IP_PROTO],
|
|
&fl6.flowi6_proto, AF_INET6,
|
|
extack);
|
|
if (err)
|
|
goto errout;
|
|
}
|
|
|
|
if (iif) {
|
|
struct net_device *dev;
|
|
int flags = 0;
|
|
|
|
rcu_read_lock();
|
|
|
|
dev = dev_get_by_index_rcu(net, iif);
|
|
if (!dev) {
|
|
rcu_read_unlock();
|
|
err = -ENODEV;
|
|
goto errout;
|
|
}
|
|
|
|
fl6.flowi6_iif = iif;
|
|
|
|
if (!ipv6_addr_any(&fl6.saddr))
|
|
flags |= RT6_LOOKUP_F_HAS_SADDR;
|
|
|
|
dst = ip6_route_input_lookup(net, dev, &fl6, NULL, flags);
|
|
|
|
rcu_read_unlock();
|
|
} else {
|
|
fl6.flowi6_oif = oif;
|
|
|
|
dst = ip6_route_output(net, NULL, &fl6);
|
|
}
|
|
|
|
|
|
rt = container_of(dst, struct rt6_info, dst);
|
|
if (rt->dst.error) {
|
|
err = rt->dst.error;
|
|
ip6_rt_put(rt);
|
|
goto errout;
|
|
}
|
|
|
|
if (rt == net->ipv6.ip6_null_entry) {
|
|
err = rt->dst.error;
|
|
ip6_rt_put(rt);
|
|
goto errout;
|
|
}
|
|
|
|
skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
|
|
if (!skb) {
|
|
ip6_rt_put(rt);
|
|
err = -ENOBUFS;
|
|
goto errout;
|
|
}
|
|
|
|
skb_dst_set(skb, &rt->dst);
|
|
|
|
rcu_read_lock();
|
|
from = rcu_dereference(rt->from);
|
|
|
|
if (fibmatch)
|
|
err = rt6_fill_node(net, skb, from, NULL, NULL, NULL, iif,
|
|
RTM_NEWROUTE, NETLINK_CB(in_skb).portid,
|
|
nlh->nlmsg_seq, 0);
|
|
else
|
|
err = rt6_fill_node(net, skb, from, dst, &fl6.daddr,
|
|
&fl6.saddr, iif, RTM_NEWROUTE,
|
|
NETLINK_CB(in_skb).portid, nlh->nlmsg_seq,
|
|
0);
|
|
rcu_read_unlock();
|
|
|
|
if (err < 0) {
|
|
kfree_skb(skb);
|
|
goto errout;
|
|
}
|
|
|
|
err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
|
|
errout:
|
|
return err;
|
|
}
|
|
|
|
void inet6_rt_notify(int event, struct fib6_info *rt, struct nl_info *info,
|
|
unsigned int nlm_flags)
|
|
{
|
|
struct sk_buff *skb;
|
|
struct net *net = info->nl_net;
|
|
u32 seq;
|
|
int err;
|
|
|
|
err = -ENOBUFS;
|
|
seq = info->nlh ? info->nlh->nlmsg_seq : 0;
|
|
|
|
skb = nlmsg_new(rt6_nlmsg_size(rt), gfp_any());
|
|
if (!skb)
|
|
goto errout;
|
|
|
|
err = rt6_fill_node(net, skb, rt, NULL, NULL, NULL, 0,
|
|
event, info->portid, seq, nlm_flags);
|
|
if (err < 0) {
|
|
/* -EMSGSIZE implies BUG in rt6_nlmsg_size() */
|
|
WARN_ON(err == -EMSGSIZE);
|
|
kfree_skb(skb);
|
|
goto errout;
|
|
}
|
|
rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE,
|
|
info->nlh, gfp_any());
|
|
return;
|
|
errout:
|
|
if (err < 0)
|
|
rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err);
|
|
}
|
|
|
|
static int ip6_route_dev_notify(struct notifier_block *this,
|
|
unsigned long event, void *ptr)
|
|
{
|
|
struct net_device *dev = netdev_notifier_info_to_dev(ptr);
|
|
struct net *net = dev_net(dev);
|
|
|
|
if (!(dev->flags & IFF_LOOPBACK))
|
|
return NOTIFY_OK;
|
|
|
|
if (event == NETDEV_REGISTER) {
|
|
net->ipv6.fib6_null_entry->fib6_nh.fib_nh_dev = dev;
|
|
net->ipv6.ip6_null_entry->dst.dev = dev;
|
|
net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev);
|
|
#ifdef CONFIG_IPV6_MULTIPLE_TABLES
|
|
net->ipv6.ip6_prohibit_entry->dst.dev = dev;
|
|
net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev);
|
|
net->ipv6.ip6_blk_hole_entry->dst.dev = dev;
|
|
net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev);
|
|
#endif
|
|
} else if (event == NETDEV_UNREGISTER &&
|
|
dev->reg_state != NETREG_UNREGISTERED) {
|
|
/* NETDEV_UNREGISTER could be fired for multiple times by
|
|
* netdev_wait_allrefs(). Make sure we only call this once.
|
|
*/
|
|
in6_dev_put_clear(&net->ipv6.ip6_null_entry->rt6i_idev);
|
|
#ifdef CONFIG_IPV6_MULTIPLE_TABLES
|
|
in6_dev_put_clear(&net->ipv6.ip6_prohibit_entry->rt6i_idev);
|
|
in6_dev_put_clear(&net->ipv6.ip6_blk_hole_entry->rt6i_idev);
|
|
#endif
|
|
}
|
|
|
|
return NOTIFY_OK;
|
|
}
|
|
|
|
/*
|
|
* /proc
|
|
*/
|
|
|
|
#ifdef CONFIG_PROC_FS
|
|
static int rt6_stats_seq_show(struct seq_file *seq, void *v)
|
|
{
|
|
struct net *net = (struct net *)seq->private;
|
|
seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n",
|
|
net->ipv6.rt6_stats->fib_nodes,
|
|
net->ipv6.rt6_stats->fib_route_nodes,
|
|
atomic_read(&net->ipv6.rt6_stats->fib_rt_alloc),
|
|
net->ipv6.rt6_stats->fib_rt_entries,
|
|
net->ipv6.rt6_stats->fib_rt_cache,
|
|
dst_entries_get_slow(&net->ipv6.ip6_dst_ops),
|
|
net->ipv6.rt6_stats->fib_discarded_routes);
|
|
|
|
return 0;
|
|
}
|
|
#endif /* CONFIG_PROC_FS */
|
|
|
|
#ifdef CONFIG_SYSCTL
|
|
|
|
static
|
|
int ipv6_sysctl_rtcache_flush(struct ctl_table *ctl, int write,
|
|
void __user *buffer, size_t *lenp, loff_t *ppos)
|
|
{
|
|
struct net *net;
|
|
int delay;
|
|
int ret;
|
|
if (!write)
|
|
return -EINVAL;
|
|
|
|
net = (struct net *)ctl->extra1;
|
|
delay = net->ipv6.sysctl.flush_delay;
|
|
ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
|
|
if (ret)
|
|
return ret;
|
|
|
|
fib6_run_gc(delay <= 0 ? 0 : (unsigned long)delay, net, delay > 0);
|
|
return 0;
|
|
}
|
|
|
|
static int zero;
|
|
static int one = 1;
|
|
|
|
static struct ctl_table ipv6_route_table_template[] = {
|
|
{
|
|
.procname = "flush",
|
|
.data = &init_net.ipv6.sysctl.flush_delay,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0200,
|
|
.proc_handler = ipv6_sysctl_rtcache_flush
|
|
},
|
|
{
|
|
.procname = "gc_thresh",
|
|
.data = &ip6_dst_ops_template.gc_thresh,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec,
|
|
},
|
|
{
|
|
.procname = "max_size",
|
|
.data = &init_net.ipv6.sysctl.ip6_rt_max_size,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec,
|
|
},
|
|
{
|
|
.procname = "gc_min_interval",
|
|
.data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_jiffies,
|
|
},
|
|
{
|
|
.procname = "gc_timeout",
|
|
.data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_jiffies,
|
|
},
|
|
{
|
|
.procname = "gc_interval",
|
|
.data = &init_net.ipv6.sysctl.ip6_rt_gc_interval,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_jiffies,
|
|
},
|
|
{
|
|
.procname = "gc_elasticity",
|
|
.data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec,
|
|
},
|
|
{
|
|
.procname = "mtu_expires",
|
|
.data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_jiffies,
|
|
},
|
|
{
|
|
.procname = "min_adv_mss",
|
|
.data = &init_net.ipv6.sysctl.ip6_rt_min_advmss,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec,
|
|
},
|
|
{
|
|
.procname = "gc_min_interval_ms",
|
|
.data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_ms_jiffies,
|
|
},
|
|
{
|
|
.procname = "skip_notify_on_dev_down",
|
|
.data = &init_net.ipv6.sysctl.skip_notify_on_dev_down,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec,
|
|
.extra1 = &zero,
|
|
.extra2 = &one,
|
|
},
|
|
{ }
|
|
};
|
|
|
|
struct ctl_table * __net_init ipv6_route_sysctl_init(struct net *net)
|
|
{
|
|
struct ctl_table *table;
|
|
|
|
table = kmemdup(ipv6_route_table_template,
|
|
sizeof(ipv6_route_table_template),
|
|
GFP_KERNEL);
|
|
|
|
if (table) {
|
|
table[0].data = &net->ipv6.sysctl.flush_delay;
|
|
table[0].extra1 = net;
|
|
table[1].data = &net->ipv6.ip6_dst_ops.gc_thresh;
|
|
table[2].data = &net->ipv6.sysctl.ip6_rt_max_size;
|
|
table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
|
|
table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout;
|
|
table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval;
|
|
table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity;
|
|
table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires;
|
|
table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss;
|
|
table[9].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
|
|
table[10].data = &net->ipv6.sysctl.skip_notify_on_dev_down;
|
|
|
|
/* Don't export sysctls to unprivileged users */
|
|
if (net->user_ns != &init_user_ns)
|
|
table[0].procname = NULL;
|
|
}
|
|
|
|
return table;
|
|
}
|
|
#endif
|
|
|
|
static int __net_init ip6_route_net_init(struct net *net)
|
|
{
|
|
int ret = -ENOMEM;
|
|
|
|
memcpy(&net->ipv6.ip6_dst_ops, &ip6_dst_ops_template,
|
|
sizeof(net->ipv6.ip6_dst_ops));
|
|
|
|
if (dst_entries_init(&net->ipv6.ip6_dst_ops) < 0)
|
|
goto out_ip6_dst_ops;
|
|
|
|
net->ipv6.fib6_null_entry = kmemdup(&fib6_null_entry_template,
|
|
sizeof(*net->ipv6.fib6_null_entry),
|
|
GFP_KERNEL);
|
|
if (!net->ipv6.fib6_null_entry)
|
|
goto out_ip6_dst_entries;
|
|
|
|
net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template,
|
|
sizeof(*net->ipv6.ip6_null_entry),
|
|
GFP_KERNEL);
|
|
if (!net->ipv6.ip6_null_entry)
|
|
goto out_fib6_null_entry;
|
|
net->ipv6.ip6_null_entry->dst.ops = &net->ipv6.ip6_dst_ops;
|
|
dst_init_metrics(&net->ipv6.ip6_null_entry->dst,
|
|
ip6_template_metrics, true);
|
|
|
|
#ifdef CONFIG_IPV6_MULTIPLE_TABLES
|
|
net->ipv6.fib6_has_custom_rules = false;
|
|
net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template,
|
|
sizeof(*net->ipv6.ip6_prohibit_entry),
|
|
GFP_KERNEL);
|
|
if (!net->ipv6.ip6_prohibit_entry)
|
|
goto out_ip6_null_entry;
|
|
net->ipv6.ip6_prohibit_entry->dst.ops = &net->ipv6.ip6_dst_ops;
|
|
dst_init_metrics(&net->ipv6.ip6_prohibit_entry->dst,
|
|
ip6_template_metrics, true);
|
|
|
|
net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template,
|
|
sizeof(*net->ipv6.ip6_blk_hole_entry),
|
|
GFP_KERNEL);
|
|
if (!net->ipv6.ip6_blk_hole_entry)
|
|
goto out_ip6_prohibit_entry;
|
|
net->ipv6.ip6_blk_hole_entry->dst.ops = &net->ipv6.ip6_dst_ops;
|
|
dst_init_metrics(&net->ipv6.ip6_blk_hole_entry->dst,
|
|
ip6_template_metrics, true);
|
|
#endif
|
|
|
|
net->ipv6.sysctl.flush_delay = 0;
|
|
net->ipv6.sysctl.ip6_rt_max_size = 4096;
|
|
net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2;
|
|
net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ;
|
|
net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ;
|
|
net->ipv6.sysctl.ip6_rt_gc_elasticity = 9;
|
|
net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ;
|
|
net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40;
|
|
net->ipv6.sysctl.skip_notify_on_dev_down = 0;
|
|
|
|
net->ipv6.ip6_rt_gc_expire = 30*HZ;
|
|
|
|
ret = 0;
|
|
out:
|
|
return ret;
|
|
|
|
#ifdef CONFIG_IPV6_MULTIPLE_TABLES
|
|
out_ip6_prohibit_entry:
|
|
kfree(net->ipv6.ip6_prohibit_entry);
|
|
out_ip6_null_entry:
|
|
kfree(net->ipv6.ip6_null_entry);
|
|
#endif
|
|
out_fib6_null_entry:
|
|
kfree(net->ipv6.fib6_null_entry);
|
|
out_ip6_dst_entries:
|
|
dst_entries_destroy(&net->ipv6.ip6_dst_ops);
|
|
out_ip6_dst_ops:
|
|
goto out;
|
|
}
|
|
|
|
static void __net_exit ip6_route_net_exit(struct net *net)
|
|
{
|
|
kfree(net->ipv6.fib6_null_entry);
|
|
kfree(net->ipv6.ip6_null_entry);
|
|
#ifdef CONFIG_IPV6_MULTIPLE_TABLES
|
|
kfree(net->ipv6.ip6_prohibit_entry);
|
|
kfree(net->ipv6.ip6_blk_hole_entry);
|
|
#endif
|
|
dst_entries_destroy(&net->ipv6.ip6_dst_ops);
|
|
}
|
|
|
|
static int __net_init ip6_route_net_init_late(struct net *net)
|
|
{
|
|
#ifdef CONFIG_PROC_FS
|
|
proc_create_net("ipv6_route", 0, net->proc_net, &ipv6_route_seq_ops,
|
|
sizeof(struct ipv6_route_iter));
|
|
proc_create_net_single("rt6_stats", 0444, net->proc_net,
|
|
rt6_stats_seq_show, NULL);
|
|
#endif
|
|
return 0;
|
|
}
|
|
|
|
static void __net_exit ip6_route_net_exit_late(struct net *net)
|
|
{
|
|
#ifdef CONFIG_PROC_FS
|
|
remove_proc_entry("ipv6_route", net->proc_net);
|
|
remove_proc_entry("rt6_stats", net->proc_net);
|
|
#endif
|
|
}
|
|
|
|
static struct pernet_operations ip6_route_net_ops = {
|
|
.init = ip6_route_net_init,
|
|
.exit = ip6_route_net_exit,
|
|
};
|
|
|
|
static int __net_init ipv6_inetpeer_init(struct net *net)
|
|
{
|
|
struct inet_peer_base *bp = kmalloc(sizeof(*bp), GFP_KERNEL);
|
|
|
|
if (!bp)
|
|
return -ENOMEM;
|
|
inet_peer_base_init(bp);
|
|
net->ipv6.peers = bp;
|
|
return 0;
|
|
}
|
|
|
|
static void __net_exit ipv6_inetpeer_exit(struct net *net)
|
|
{
|
|
struct inet_peer_base *bp = net->ipv6.peers;
|
|
|
|
net->ipv6.peers = NULL;
|
|
inetpeer_invalidate_tree(bp);
|
|
kfree(bp);
|
|
}
|
|
|
|
static struct pernet_operations ipv6_inetpeer_ops = {
|
|
.init = ipv6_inetpeer_init,
|
|
.exit = ipv6_inetpeer_exit,
|
|
};
|
|
|
|
static struct pernet_operations ip6_route_net_late_ops = {
|
|
.init = ip6_route_net_init_late,
|
|
.exit = ip6_route_net_exit_late,
|
|
};
|
|
|
|
static struct notifier_block ip6_route_dev_notifier = {
|
|
.notifier_call = ip6_route_dev_notify,
|
|
.priority = ADDRCONF_NOTIFY_PRIORITY - 10,
|
|
};
|
|
|
|
void __init ip6_route_init_special_entries(void)
|
|
{
|
|
/* Registering of the loopback is done before this portion of code,
|
|
* the loopback reference in rt6_info will not be taken, do it
|
|
* manually for init_net */
|
|
init_net.ipv6.fib6_null_entry->fib6_nh.fib_nh_dev = init_net.loopback_dev;
|
|
init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev;
|
|
init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
|
|
#ifdef CONFIG_IPV6_MULTIPLE_TABLES
|
|
init_net.ipv6.ip6_prohibit_entry->dst.dev = init_net.loopback_dev;
|
|
init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
|
|
init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev;
|
|
init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
|
|
#endif
|
|
}
|
|
|
|
int __init ip6_route_init(void)
|
|
{
|
|
int ret;
|
|
int cpu;
|
|
|
|
ret = -ENOMEM;
|
|
ip6_dst_ops_template.kmem_cachep =
|
|
kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0,
|
|
SLAB_HWCACHE_ALIGN, NULL);
|
|
if (!ip6_dst_ops_template.kmem_cachep)
|
|
goto out;
|
|
|
|
ret = dst_entries_init(&ip6_dst_blackhole_ops);
|
|
if (ret)
|
|
goto out_kmem_cache;
|
|
|
|
ret = register_pernet_subsys(&ipv6_inetpeer_ops);
|
|
if (ret)
|
|
goto out_dst_entries;
|
|
|
|
ret = register_pernet_subsys(&ip6_route_net_ops);
|
|
if (ret)
|
|
goto out_register_inetpeer;
|
|
|
|
ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep;
|
|
|
|
ret = fib6_init();
|
|
if (ret)
|
|
goto out_register_subsys;
|
|
|
|
ret = xfrm6_init();
|
|
if (ret)
|
|
goto out_fib6_init;
|
|
|
|
ret = fib6_rules_init();
|
|
if (ret)
|
|
goto xfrm6_init;
|
|
|
|
ret = register_pernet_subsys(&ip6_route_net_late_ops);
|
|
if (ret)
|
|
goto fib6_rules_init;
|
|
|
|
ret = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWROUTE,
|
|
inet6_rtm_newroute, NULL, 0);
|
|
if (ret < 0)
|
|
goto out_register_late_subsys;
|
|
|
|
ret = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELROUTE,
|
|
inet6_rtm_delroute, NULL, 0);
|
|
if (ret < 0)
|
|
goto out_register_late_subsys;
|
|
|
|
ret = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETROUTE,
|
|
inet6_rtm_getroute, NULL,
|
|
RTNL_FLAG_DOIT_UNLOCKED);
|
|
if (ret < 0)
|
|
goto out_register_late_subsys;
|
|
|
|
ret = register_netdevice_notifier(&ip6_route_dev_notifier);
|
|
if (ret)
|
|
goto out_register_late_subsys;
|
|
|
|
for_each_possible_cpu(cpu) {
|
|
struct uncached_list *ul = per_cpu_ptr(&rt6_uncached_list, cpu);
|
|
|
|
INIT_LIST_HEAD(&ul->head);
|
|
spin_lock_init(&ul->lock);
|
|
}
|
|
|
|
out:
|
|
return ret;
|
|
|
|
out_register_late_subsys:
|
|
rtnl_unregister_all(PF_INET6);
|
|
unregister_pernet_subsys(&ip6_route_net_late_ops);
|
|
fib6_rules_init:
|
|
fib6_rules_cleanup();
|
|
xfrm6_init:
|
|
xfrm6_fini();
|
|
out_fib6_init:
|
|
fib6_gc_cleanup();
|
|
out_register_subsys:
|
|
unregister_pernet_subsys(&ip6_route_net_ops);
|
|
out_register_inetpeer:
|
|
unregister_pernet_subsys(&ipv6_inetpeer_ops);
|
|
out_dst_entries:
|
|
dst_entries_destroy(&ip6_dst_blackhole_ops);
|
|
out_kmem_cache:
|
|
kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
|
|
goto out;
|
|
}
|
|
|
|
void ip6_route_cleanup(void)
|
|
{
|
|
unregister_netdevice_notifier(&ip6_route_dev_notifier);
|
|
unregister_pernet_subsys(&ip6_route_net_late_ops);
|
|
fib6_rules_cleanup();
|
|
xfrm6_fini();
|
|
fib6_gc_cleanup();
|
|
unregister_pernet_subsys(&ipv6_inetpeer_ops);
|
|
unregister_pernet_subsys(&ip6_route_net_ops);
|
|
dst_entries_destroy(&ip6_dst_blackhole_ops);
|
|
kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
|
|
}
|