forked from Minki/linux
00bc0ef588
At present we perform an xfrm_lookup() for each UDPv6 message we send. The lookup involves querying the flow cache (flow_cache_lookup) and, in case of a cache miss, creating an XFRM bundle. If we miss the flow cache, we can end up creating a new bundle and deriving the path MTU (xfrm_init_pmtu) from on an already transformed dst_entry, which we pass from the socket cache (sk->sk_dst_cache) down to xfrm_lookup(). This can happen only if we're caching the dst_entry in the socket, that is when we're using a connected UDP socket. To put it another way, the path MTU shrinks each time we miss the flow cache, which later on leads to incorrectly fragmented payload. It can be observed with ESPv6 in transport mode: 1) Set up a transformation and lower the MTU to trigger fragmentation # ip xfrm policy add dir out src ::1 dst ::1 \ tmpl src ::1 dst ::1 proto esp spi 1 # ip xfrm state add src ::1 dst ::1 \ proto esp spi 1 enc 'aes' 0x0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b # ip link set dev lo mtu 1500 2) Monitor the packet flow and set up an UDP sink # tcpdump -ni lo -ttt & # socat udp6-listen:12345,fork /dev/null & 3) Send a datagram that needs fragmentation with a connected socket # perl -e 'print "@" x 1470 | socat - udp6:[::1]:12345 2016/06/07 18:52:52 socat[724] E read(3, 0x555bb3d5ba00, 8192): Protocol error 00:00:00.000000 IP6 ::1 > ::1: frag (0|1448) ESP(spi=0x00000001,seq=0x2), length 1448 00:00:00.000014 IP6 ::1 > ::1: frag (1448|32) 00:00:00.000050 IP6 ::1 > ::1: ESP(spi=0x00000001,seq=0x3), length 1272 (^ ICMPv6 Parameter Problem) 00:00:00.000022 IP6 ::1 > ::1: ESP(spi=0x00000001,seq=0x5), length 136 4) Compare it to a non-connected socket # perl -e 'print "@" x 1500' | socat - udp6-sendto:[::1]:12345 00:00:40.535488 IP6 ::1 > ::1: frag (0|1448) ESP(spi=0x00000001,seq=0x6), length 1448 00:00:00.000010 IP6 ::1 > ::1: frag (1448|64) What happens in step (3) is: 1) when connecting the socket in __ip6_datagram_connect(), we perform an XFRM lookup, miss the flow cache, create an XFRM bundle, and cache the destination, 2) afterwards, when sending the datagram, we perform an XFRM lookup, again, miss the flow cache (due to mismatch of flowi6_iif and flowi6_oif, which is an issue of its own), and recreate an XFRM bundle based on the cached (and already transformed) destination. To prevent the recreation of an XFRM bundle, avoid an XFRM lookup altogether whenever we already have a destination entry cached in the socket. This prevents the path MTU shrinkage and brings us on par with UDPv4. The fix also benefits connected PINGv6 sockets, another user of ip6_sk_dst_lookup_flow(), who also suffer messages being transformed twice. Joint work with Hannes Frederic Sowa. Reported-by: Jan Tluka <jtluka@redhat.com> Signed-off-by: Jakub Sitnicki <jkbs@redhat.com> Acked-by: Hannes Frederic Sowa <hannes@stressinduktion.org> Signed-off-by: David S. Miller <davem@davemloft.net>
1786 lines
45 KiB
C
1786 lines
45 KiB
C
/*
|
|
* IPv6 output functions
|
|
* Linux INET6 implementation
|
|
*
|
|
* Authors:
|
|
* Pedro Roque <roque@di.fc.ul.pt>
|
|
*
|
|
* Based on linux/net/ipv4/ip_output.c
|
|
*
|
|
* 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:
|
|
* A.N.Kuznetsov : airthmetics in fragmentation.
|
|
* extension headers are implemented.
|
|
* route changes now work.
|
|
* ip6_forward does not confuse sniffers.
|
|
* etc.
|
|
*
|
|
* H. von Brand : Added missing #include <linux/string.h>
|
|
* Imran Patel : frag id should be in NBO
|
|
* Kazunori MIYAZAWA @USAGI
|
|
* : add ip6_append_data and related functions
|
|
* for datagram xmit
|
|
*/
|
|
|
|
#include <linux/errno.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/string.h>
|
|
#include <linux/socket.h>
|
|
#include <linux/net.h>
|
|
#include <linux/netdevice.h>
|
|
#include <linux/if_arp.h>
|
|
#include <linux/in6.h>
|
|
#include <linux/tcp.h>
|
|
#include <linux/route.h>
|
|
#include <linux/module.h>
|
|
#include <linux/slab.h>
|
|
|
|
#include <linux/netfilter.h>
|
|
#include <linux/netfilter_ipv6.h>
|
|
|
|
#include <net/sock.h>
|
|
#include <net/snmp.h>
|
|
|
|
#include <net/ipv6.h>
|
|
#include <net/ndisc.h>
|
|
#include <net/protocol.h>
|
|
#include <net/ip6_route.h>
|
|
#include <net/addrconf.h>
|
|
#include <net/rawv6.h>
|
|
#include <net/icmp.h>
|
|
#include <net/xfrm.h>
|
|
#include <net/checksum.h>
|
|
#include <linux/mroute6.h>
|
|
#include <net/l3mdev.h>
|
|
|
|
static int ip6_finish_output2(struct net *net, struct sock *sk, struct sk_buff *skb)
|
|
{
|
|
struct dst_entry *dst = skb_dst(skb);
|
|
struct net_device *dev = dst->dev;
|
|
struct neighbour *neigh;
|
|
struct in6_addr *nexthop;
|
|
int ret;
|
|
|
|
skb->protocol = htons(ETH_P_IPV6);
|
|
skb->dev = dev;
|
|
|
|
if (ipv6_addr_is_multicast(&ipv6_hdr(skb)->daddr)) {
|
|
struct inet6_dev *idev = ip6_dst_idev(skb_dst(skb));
|
|
|
|
if (!(dev->flags & IFF_LOOPBACK) && sk_mc_loop(sk) &&
|
|
((mroute6_socket(net, skb) &&
|
|
!(IP6CB(skb)->flags & IP6SKB_FORWARDED)) ||
|
|
ipv6_chk_mcast_addr(dev, &ipv6_hdr(skb)->daddr,
|
|
&ipv6_hdr(skb)->saddr))) {
|
|
struct sk_buff *newskb = skb_clone(skb, GFP_ATOMIC);
|
|
|
|
/* Do not check for IFF_ALLMULTI; multicast routing
|
|
is not supported in any case.
|
|
*/
|
|
if (newskb)
|
|
NF_HOOK(NFPROTO_IPV6, NF_INET_POST_ROUTING,
|
|
net, sk, newskb, NULL, newskb->dev,
|
|
dev_loopback_xmit);
|
|
|
|
if (ipv6_hdr(skb)->hop_limit == 0) {
|
|
IP6_INC_STATS(net, idev,
|
|
IPSTATS_MIB_OUTDISCARDS);
|
|
kfree_skb(skb);
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUTMCAST, skb->len);
|
|
|
|
if (IPV6_ADDR_MC_SCOPE(&ipv6_hdr(skb)->daddr) <=
|
|
IPV6_ADDR_SCOPE_NODELOCAL &&
|
|
!(dev->flags & IFF_LOOPBACK)) {
|
|
kfree_skb(skb);
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
rcu_read_lock_bh();
|
|
nexthop = rt6_nexthop((struct rt6_info *)dst, &ipv6_hdr(skb)->daddr);
|
|
neigh = __ipv6_neigh_lookup_noref(dst->dev, nexthop);
|
|
if (unlikely(!neigh))
|
|
neigh = __neigh_create(&nd_tbl, nexthop, dst->dev, false);
|
|
if (!IS_ERR(neigh)) {
|
|
ret = dst_neigh_output(dst, neigh, skb);
|
|
rcu_read_unlock_bh();
|
|
return ret;
|
|
}
|
|
rcu_read_unlock_bh();
|
|
|
|
IP6_INC_STATS(net, ip6_dst_idev(dst), IPSTATS_MIB_OUTNOROUTES);
|
|
kfree_skb(skb);
|
|
return -EINVAL;
|
|
}
|
|
|
|
static int ip6_finish_output(struct net *net, struct sock *sk, struct sk_buff *skb)
|
|
{
|
|
if ((skb->len > ip6_skb_dst_mtu(skb) && !skb_is_gso(skb)) ||
|
|
dst_allfrag(skb_dst(skb)) ||
|
|
(IP6CB(skb)->frag_max_size && skb->len > IP6CB(skb)->frag_max_size))
|
|
return ip6_fragment(net, sk, skb, ip6_finish_output2);
|
|
else
|
|
return ip6_finish_output2(net, sk, skb);
|
|
}
|
|
|
|
int ip6_output(struct net *net, struct sock *sk, struct sk_buff *skb)
|
|
{
|
|
struct net_device *dev = skb_dst(skb)->dev;
|
|
struct inet6_dev *idev = ip6_dst_idev(skb_dst(skb));
|
|
|
|
if (unlikely(idev->cnf.disable_ipv6)) {
|
|
IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
|
|
kfree_skb(skb);
|
|
return 0;
|
|
}
|
|
|
|
return NF_HOOK_COND(NFPROTO_IPV6, NF_INET_POST_ROUTING,
|
|
net, sk, skb, NULL, dev,
|
|
ip6_finish_output,
|
|
!(IP6CB(skb)->flags & IP6SKB_REROUTED));
|
|
}
|
|
|
|
/*
|
|
* xmit an sk_buff (used by TCP, SCTP and DCCP)
|
|
* Note : socket lock is not held for SYNACK packets, but might be modified
|
|
* by calls to skb_set_owner_w() and ipv6_local_error(),
|
|
* which are using proper atomic operations or spinlocks.
|
|
*/
|
|
int ip6_xmit(const struct sock *sk, struct sk_buff *skb, struct flowi6 *fl6,
|
|
struct ipv6_txoptions *opt, int tclass)
|
|
{
|
|
struct net *net = sock_net(sk);
|
|
const struct ipv6_pinfo *np = inet6_sk(sk);
|
|
struct in6_addr *first_hop = &fl6->daddr;
|
|
struct dst_entry *dst = skb_dst(skb);
|
|
struct ipv6hdr *hdr;
|
|
u8 proto = fl6->flowi6_proto;
|
|
int seg_len = skb->len;
|
|
int hlimit = -1;
|
|
u32 mtu;
|
|
|
|
if (opt) {
|
|
unsigned int head_room;
|
|
|
|
/* First: exthdrs may take lots of space (~8K for now)
|
|
MAX_HEADER is not enough.
|
|
*/
|
|
head_room = opt->opt_nflen + opt->opt_flen;
|
|
seg_len += head_room;
|
|
head_room += sizeof(struct ipv6hdr) + LL_RESERVED_SPACE(dst->dev);
|
|
|
|
if (skb_headroom(skb) < head_room) {
|
|
struct sk_buff *skb2 = skb_realloc_headroom(skb, head_room);
|
|
if (!skb2) {
|
|
IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)),
|
|
IPSTATS_MIB_OUTDISCARDS);
|
|
kfree_skb(skb);
|
|
return -ENOBUFS;
|
|
}
|
|
consume_skb(skb);
|
|
skb = skb2;
|
|
/* skb_set_owner_w() changes sk->sk_wmem_alloc atomically,
|
|
* it is safe to call in our context (socket lock not held)
|
|
*/
|
|
skb_set_owner_w(skb, (struct sock *)sk);
|
|
}
|
|
if (opt->opt_flen)
|
|
ipv6_push_frag_opts(skb, opt, &proto);
|
|
if (opt->opt_nflen)
|
|
ipv6_push_nfrag_opts(skb, opt, &proto, &first_hop);
|
|
}
|
|
|
|
skb_push(skb, sizeof(struct ipv6hdr));
|
|
skb_reset_network_header(skb);
|
|
hdr = ipv6_hdr(skb);
|
|
|
|
/*
|
|
* Fill in the IPv6 header
|
|
*/
|
|
if (np)
|
|
hlimit = np->hop_limit;
|
|
if (hlimit < 0)
|
|
hlimit = ip6_dst_hoplimit(dst);
|
|
|
|
ip6_flow_hdr(hdr, tclass, ip6_make_flowlabel(net, skb, fl6->flowlabel,
|
|
np->autoflowlabel, fl6));
|
|
|
|
hdr->payload_len = htons(seg_len);
|
|
hdr->nexthdr = proto;
|
|
hdr->hop_limit = hlimit;
|
|
|
|
hdr->saddr = fl6->saddr;
|
|
hdr->daddr = *first_hop;
|
|
|
|
skb->protocol = htons(ETH_P_IPV6);
|
|
skb->priority = sk->sk_priority;
|
|
skb->mark = sk->sk_mark;
|
|
|
|
mtu = dst_mtu(dst);
|
|
if ((skb->len <= mtu) || skb->ignore_df || skb_is_gso(skb)) {
|
|
IP6_UPD_PO_STATS(net, ip6_dst_idev(skb_dst(skb)),
|
|
IPSTATS_MIB_OUT, skb->len);
|
|
/* hooks should never assume socket lock is held.
|
|
* we promote our socket to non const
|
|
*/
|
|
return NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT,
|
|
net, (struct sock *)sk, skb, NULL, dst->dev,
|
|
dst_output);
|
|
}
|
|
|
|
skb->dev = dst->dev;
|
|
/* ipv6_local_error() does not require socket lock,
|
|
* we promote our socket to non const
|
|
*/
|
|
ipv6_local_error((struct sock *)sk, EMSGSIZE, fl6, mtu);
|
|
|
|
IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_FRAGFAILS);
|
|
kfree_skb(skb);
|
|
return -EMSGSIZE;
|
|
}
|
|
EXPORT_SYMBOL(ip6_xmit);
|
|
|
|
static int ip6_call_ra_chain(struct sk_buff *skb, int sel)
|
|
{
|
|
struct ip6_ra_chain *ra;
|
|
struct sock *last = NULL;
|
|
|
|
read_lock(&ip6_ra_lock);
|
|
for (ra = ip6_ra_chain; ra; ra = ra->next) {
|
|
struct sock *sk = ra->sk;
|
|
if (sk && ra->sel == sel &&
|
|
(!sk->sk_bound_dev_if ||
|
|
sk->sk_bound_dev_if == skb->dev->ifindex)) {
|
|
if (last) {
|
|
struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
|
|
if (skb2)
|
|
rawv6_rcv(last, skb2);
|
|
}
|
|
last = sk;
|
|
}
|
|
}
|
|
|
|
if (last) {
|
|
rawv6_rcv(last, skb);
|
|
read_unlock(&ip6_ra_lock);
|
|
return 1;
|
|
}
|
|
read_unlock(&ip6_ra_lock);
|
|
return 0;
|
|
}
|
|
|
|
static int ip6_forward_proxy_check(struct sk_buff *skb)
|
|
{
|
|
struct ipv6hdr *hdr = ipv6_hdr(skb);
|
|
u8 nexthdr = hdr->nexthdr;
|
|
__be16 frag_off;
|
|
int offset;
|
|
|
|
if (ipv6_ext_hdr(nexthdr)) {
|
|
offset = ipv6_skip_exthdr(skb, sizeof(*hdr), &nexthdr, &frag_off);
|
|
if (offset < 0)
|
|
return 0;
|
|
} else
|
|
offset = sizeof(struct ipv6hdr);
|
|
|
|
if (nexthdr == IPPROTO_ICMPV6) {
|
|
struct icmp6hdr *icmp6;
|
|
|
|
if (!pskb_may_pull(skb, (skb_network_header(skb) +
|
|
offset + 1 - skb->data)))
|
|
return 0;
|
|
|
|
icmp6 = (struct icmp6hdr *)(skb_network_header(skb) + offset);
|
|
|
|
switch (icmp6->icmp6_type) {
|
|
case NDISC_ROUTER_SOLICITATION:
|
|
case NDISC_ROUTER_ADVERTISEMENT:
|
|
case NDISC_NEIGHBOUR_SOLICITATION:
|
|
case NDISC_NEIGHBOUR_ADVERTISEMENT:
|
|
case NDISC_REDIRECT:
|
|
/* For reaction involving unicast neighbor discovery
|
|
* message destined to the proxied address, pass it to
|
|
* input function.
|
|
*/
|
|
return 1;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* The proxying router can't forward traffic sent to a link-local
|
|
* address, so signal the sender and discard the packet. This
|
|
* behavior is clarified by the MIPv6 specification.
|
|
*/
|
|
if (ipv6_addr_type(&hdr->daddr) & IPV6_ADDR_LINKLOCAL) {
|
|
dst_link_failure(skb);
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static inline int ip6_forward_finish(struct net *net, struct sock *sk,
|
|
struct sk_buff *skb)
|
|
{
|
|
return dst_output(net, sk, skb);
|
|
}
|
|
|
|
static unsigned int ip6_dst_mtu_forward(const struct dst_entry *dst)
|
|
{
|
|
unsigned int mtu;
|
|
struct inet6_dev *idev;
|
|
|
|
if (dst_metric_locked(dst, RTAX_MTU)) {
|
|
mtu = dst_metric_raw(dst, RTAX_MTU);
|
|
if (mtu)
|
|
return mtu;
|
|
}
|
|
|
|
mtu = IPV6_MIN_MTU;
|
|
rcu_read_lock();
|
|
idev = __in6_dev_get(dst->dev);
|
|
if (idev)
|
|
mtu = idev->cnf.mtu6;
|
|
rcu_read_unlock();
|
|
|
|
return mtu;
|
|
}
|
|
|
|
static bool ip6_pkt_too_big(const struct sk_buff *skb, unsigned int mtu)
|
|
{
|
|
if (skb->len <= mtu)
|
|
return false;
|
|
|
|
/* ipv6 conntrack defrag sets max_frag_size + ignore_df */
|
|
if (IP6CB(skb)->frag_max_size && IP6CB(skb)->frag_max_size > mtu)
|
|
return true;
|
|
|
|
if (skb->ignore_df)
|
|
return false;
|
|
|
|
if (skb_is_gso(skb) && skb_gso_network_seglen(skb) <= mtu)
|
|
return false;
|
|
|
|
return true;
|
|
}
|
|
|
|
int ip6_forward(struct sk_buff *skb)
|
|
{
|
|
struct dst_entry *dst = skb_dst(skb);
|
|
struct ipv6hdr *hdr = ipv6_hdr(skb);
|
|
struct inet6_skb_parm *opt = IP6CB(skb);
|
|
struct net *net = dev_net(dst->dev);
|
|
u32 mtu;
|
|
|
|
if (net->ipv6.devconf_all->forwarding == 0)
|
|
goto error;
|
|
|
|
if (skb->pkt_type != PACKET_HOST)
|
|
goto drop;
|
|
|
|
if (unlikely(skb->sk))
|
|
goto drop;
|
|
|
|
if (skb_warn_if_lro(skb))
|
|
goto drop;
|
|
|
|
if (!xfrm6_policy_check(NULL, XFRM_POLICY_FWD, skb)) {
|
|
__IP6_INC_STATS(net, ip6_dst_idev(dst),
|
|
IPSTATS_MIB_INDISCARDS);
|
|
goto drop;
|
|
}
|
|
|
|
skb_forward_csum(skb);
|
|
|
|
/*
|
|
* We DO NOT make any processing on
|
|
* RA packets, pushing them to user level AS IS
|
|
* without ane WARRANTY that application will be able
|
|
* to interpret them. The reason is that we
|
|
* cannot make anything clever here.
|
|
*
|
|
* We are not end-node, so that if packet contains
|
|
* AH/ESP, we cannot make anything.
|
|
* Defragmentation also would be mistake, RA packets
|
|
* cannot be fragmented, because there is no warranty
|
|
* that different fragments will go along one path. --ANK
|
|
*/
|
|
if (unlikely(opt->flags & IP6SKB_ROUTERALERT)) {
|
|
if (ip6_call_ra_chain(skb, ntohs(opt->ra)))
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* check and decrement ttl
|
|
*/
|
|
if (hdr->hop_limit <= 1) {
|
|
/* Force OUTPUT device used as source address */
|
|
skb->dev = dst->dev;
|
|
icmpv6_send(skb, ICMPV6_TIME_EXCEED, ICMPV6_EXC_HOPLIMIT, 0);
|
|
__IP6_INC_STATS(net, ip6_dst_idev(dst),
|
|
IPSTATS_MIB_INHDRERRORS);
|
|
|
|
kfree_skb(skb);
|
|
return -ETIMEDOUT;
|
|
}
|
|
|
|
/* XXX: idev->cnf.proxy_ndp? */
|
|
if (net->ipv6.devconf_all->proxy_ndp &&
|
|
pneigh_lookup(&nd_tbl, net, &hdr->daddr, skb->dev, 0)) {
|
|
int proxied = ip6_forward_proxy_check(skb);
|
|
if (proxied > 0)
|
|
return ip6_input(skb);
|
|
else if (proxied < 0) {
|
|
__IP6_INC_STATS(net, ip6_dst_idev(dst),
|
|
IPSTATS_MIB_INDISCARDS);
|
|
goto drop;
|
|
}
|
|
}
|
|
|
|
if (!xfrm6_route_forward(skb)) {
|
|
__IP6_INC_STATS(net, ip6_dst_idev(dst),
|
|
IPSTATS_MIB_INDISCARDS);
|
|
goto drop;
|
|
}
|
|
dst = skb_dst(skb);
|
|
|
|
/* IPv6 specs say nothing about it, but it is clear that we cannot
|
|
send redirects to source routed frames.
|
|
We don't send redirects to frames decapsulated from IPsec.
|
|
*/
|
|
if (skb->dev == dst->dev && opt->srcrt == 0 && !skb_sec_path(skb)) {
|
|
struct in6_addr *target = NULL;
|
|
struct inet_peer *peer;
|
|
struct rt6_info *rt;
|
|
|
|
/*
|
|
* incoming and outgoing devices are the same
|
|
* send a redirect.
|
|
*/
|
|
|
|
rt = (struct rt6_info *) dst;
|
|
if (rt->rt6i_flags & RTF_GATEWAY)
|
|
target = &rt->rt6i_gateway;
|
|
else
|
|
target = &hdr->daddr;
|
|
|
|
peer = inet_getpeer_v6(net->ipv6.peers, &hdr->daddr, 1);
|
|
|
|
/* Limit redirects both by destination (here)
|
|
and by source (inside ndisc_send_redirect)
|
|
*/
|
|
if (inet_peer_xrlim_allow(peer, 1*HZ))
|
|
ndisc_send_redirect(skb, target);
|
|
if (peer)
|
|
inet_putpeer(peer);
|
|
} else {
|
|
int addrtype = ipv6_addr_type(&hdr->saddr);
|
|
|
|
/* This check is security critical. */
|
|
if (addrtype == IPV6_ADDR_ANY ||
|
|
addrtype & (IPV6_ADDR_MULTICAST | IPV6_ADDR_LOOPBACK))
|
|
goto error;
|
|
if (addrtype & IPV6_ADDR_LINKLOCAL) {
|
|
icmpv6_send(skb, ICMPV6_DEST_UNREACH,
|
|
ICMPV6_NOT_NEIGHBOUR, 0);
|
|
goto error;
|
|
}
|
|
}
|
|
|
|
mtu = ip6_dst_mtu_forward(dst);
|
|
if (mtu < IPV6_MIN_MTU)
|
|
mtu = IPV6_MIN_MTU;
|
|
|
|
if (ip6_pkt_too_big(skb, mtu)) {
|
|
/* Again, force OUTPUT device used as source address */
|
|
skb->dev = dst->dev;
|
|
icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
|
|
__IP6_INC_STATS(net, ip6_dst_idev(dst),
|
|
IPSTATS_MIB_INTOOBIGERRORS);
|
|
__IP6_INC_STATS(net, ip6_dst_idev(dst),
|
|
IPSTATS_MIB_FRAGFAILS);
|
|
kfree_skb(skb);
|
|
return -EMSGSIZE;
|
|
}
|
|
|
|
if (skb_cow(skb, dst->dev->hard_header_len)) {
|
|
__IP6_INC_STATS(net, ip6_dst_idev(dst),
|
|
IPSTATS_MIB_OUTDISCARDS);
|
|
goto drop;
|
|
}
|
|
|
|
hdr = ipv6_hdr(skb);
|
|
|
|
/* Mangling hops number delayed to point after skb COW */
|
|
|
|
hdr->hop_limit--;
|
|
|
|
__IP6_INC_STATS(net, ip6_dst_idev(dst), IPSTATS_MIB_OUTFORWDATAGRAMS);
|
|
__IP6_ADD_STATS(net, ip6_dst_idev(dst), IPSTATS_MIB_OUTOCTETS, skb->len);
|
|
return NF_HOOK(NFPROTO_IPV6, NF_INET_FORWARD,
|
|
net, NULL, skb, skb->dev, dst->dev,
|
|
ip6_forward_finish);
|
|
|
|
error:
|
|
__IP6_INC_STATS(net, ip6_dst_idev(dst), IPSTATS_MIB_INADDRERRORS);
|
|
drop:
|
|
kfree_skb(skb);
|
|
return -EINVAL;
|
|
}
|
|
|
|
static void ip6_copy_metadata(struct sk_buff *to, struct sk_buff *from)
|
|
{
|
|
to->pkt_type = from->pkt_type;
|
|
to->priority = from->priority;
|
|
to->protocol = from->protocol;
|
|
skb_dst_drop(to);
|
|
skb_dst_set(to, dst_clone(skb_dst(from)));
|
|
to->dev = from->dev;
|
|
to->mark = from->mark;
|
|
|
|
#ifdef CONFIG_NET_SCHED
|
|
to->tc_index = from->tc_index;
|
|
#endif
|
|
nf_copy(to, from);
|
|
skb_copy_secmark(to, from);
|
|
}
|
|
|
|
int ip6_fragment(struct net *net, struct sock *sk, struct sk_buff *skb,
|
|
int (*output)(struct net *, struct sock *, struct sk_buff *))
|
|
{
|
|
struct sk_buff *frag;
|
|
struct rt6_info *rt = (struct rt6_info *)skb_dst(skb);
|
|
struct ipv6_pinfo *np = skb->sk && !dev_recursion_level() ?
|
|
inet6_sk(skb->sk) : NULL;
|
|
struct ipv6hdr *tmp_hdr;
|
|
struct frag_hdr *fh;
|
|
unsigned int mtu, hlen, left, len;
|
|
int hroom, troom;
|
|
__be32 frag_id;
|
|
int ptr, offset = 0, err = 0;
|
|
u8 *prevhdr, nexthdr = 0;
|
|
|
|
hlen = ip6_find_1stfragopt(skb, &prevhdr);
|
|
nexthdr = *prevhdr;
|
|
|
|
mtu = ip6_skb_dst_mtu(skb);
|
|
|
|
/* We must not fragment if the socket is set to force MTU discovery
|
|
* or if the skb it not generated by a local socket.
|
|
*/
|
|
if (unlikely(!skb->ignore_df && skb->len > mtu))
|
|
goto fail_toobig;
|
|
|
|
if (IP6CB(skb)->frag_max_size) {
|
|
if (IP6CB(skb)->frag_max_size > mtu)
|
|
goto fail_toobig;
|
|
|
|
/* don't send fragments larger than what we received */
|
|
mtu = IP6CB(skb)->frag_max_size;
|
|
if (mtu < IPV6_MIN_MTU)
|
|
mtu = IPV6_MIN_MTU;
|
|
}
|
|
|
|
if (np && np->frag_size < mtu) {
|
|
if (np->frag_size)
|
|
mtu = np->frag_size;
|
|
}
|
|
if (mtu < hlen + sizeof(struct frag_hdr) + 8)
|
|
goto fail_toobig;
|
|
mtu -= hlen + sizeof(struct frag_hdr);
|
|
|
|
frag_id = ipv6_select_ident(net, &ipv6_hdr(skb)->daddr,
|
|
&ipv6_hdr(skb)->saddr);
|
|
|
|
if (skb->ip_summed == CHECKSUM_PARTIAL &&
|
|
(err = skb_checksum_help(skb)))
|
|
goto fail;
|
|
|
|
hroom = LL_RESERVED_SPACE(rt->dst.dev);
|
|
if (skb_has_frag_list(skb)) {
|
|
int first_len = skb_pagelen(skb);
|
|
struct sk_buff *frag2;
|
|
|
|
if (first_len - hlen > mtu ||
|
|
((first_len - hlen) & 7) ||
|
|
skb_cloned(skb) ||
|
|
skb_headroom(skb) < (hroom + sizeof(struct frag_hdr)))
|
|
goto slow_path;
|
|
|
|
skb_walk_frags(skb, frag) {
|
|
/* Correct geometry. */
|
|
if (frag->len > mtu ||
|
|
((frag->len & 7) && frag->next) ||
|
|
skb_headroom(frag) < (hlen + hroom + sizeof(struct frag_hdr)))
|
|
goto slow_path_clean;
|
|
|
|
/* Partially cloned skb? */
|
|
if (skb_shared(frag))
|
|
goto slow_path_clean;
|
|
|
|
BUG_ON(frag->sk);
|
|
if (skb->sk) {
|
|
frag->sk = skb->sk;
|
|
frag->destructor = sock_wfree;
|
|
}
|
|
skb->truesize -= frag->truesize;
|
|
}
|
|
|
|
err = 0;
|
|
offset = 0;
|
|
/* BUILD HEADER */
|
|
|
|
*prevhdr = NEXTHDR_FRAGMENT;
|
|
tmp_hdr = kmemdup(skb_network_header(skb), hlen, GFP_ATOMIC);
|
|
if (!tmp_hdr) {
|
|
IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)),
|
|
IPSTATS_MIB_FRAGFAILS);
|
|
err = -ENOMEM;
|
|
goto fail;
|
|
}
|
|
frag = skb_shinfo(skb)->frag_list;
|
|
skb_frag_list_init(skb);
|
|
|
|
__skb_pull(skb, hlen);
|
|
fh = (struct frag_hdr *)__skb_push(skb, sizeof(struct frag_hdr));
|
|
__skb_push(skb, hlen);
|
|
skb_reset_network_header(skb);
|
|
memcpy(skb_network_header(skb), tmp_hdr, hlen);
|
|
|
|
fh->nexthdr = nexthdr;
|
|
fh->reserved = 0;
|
|
fh->frag_off = htons(IP6_MF);
|
|
fh->identification = frag_id;
|
|
|
|
first_len = skb_pagelen(skb);
|
|
skb->data_len = first_len - skb_headlen(skb);
|
|
skb->len = first_len;
|
|
ipv6_hdr(skb)->payload_len = htons(first_len -
|
|
sizeof(struct ipv6hdr));
|
|
|
|
dst_hold(&rt->dst);
|
|
|
|
for (;;) {
|
|
/* Prepare header of the next frame,
|
|
* before previous one went down. */
|
|
if (frag) {
|
|
frag->ip_summed = CHECKSUM_NONE;
|
|
skb_reset_transport_header(frag);
|
|
fh = (struct frag_hdr *)__skb_push(frag, sizeof(struct frag_hdr));
|
|
__skb_push(frag, hlen);
|
|
skb_reset_network_header(frag);
|
|
memcpy(skb_network_header(frag), tmp_hdr,
|
|
hlen);
|
|
offset += skb->len - hlen - sizeof(struct frag_hdr);
|
|
fh->nexthdr = nexthdr;
|
|
fh->reserved = 0;
|
|
fh->frag_off = htons(offset);
|
|
if (frag->next)
|
|
fh->frag_off |= htons(IP6_MF);
|
|
fh->identification = frag_id;
|
|
ipv6_hdr(frag)->payload_len =
|
|
htons(frag->len -
|
|
sizeof(struct ipv6hdr));
|
|
ip6_copy_metadata(frag, skb);
|
|
}
|
|
|
|
err = output(net, sk, skb);
|
|
if (!err)
|
|
IP6_INC_STATS(net, ip6_dst_idev(&rt->dst),
|
|
IPSTATS_MIB_FRAGCREATES);
|
|
|
|
if (err || !frag)
|
|
break;
|
|
|
|
skb = frag;
|
|
frag = skb->next;
|
|
skb->next = NULL;
|
|
}
|
|
|
|
kfree(tmp_hdr);
|
|
|
|
if (err == 0) {
|
|
IP6_INC_STATS(net, ip6_dst_idev(&rt->dst),
|
|
IPSTATS_MIB_FRAGOKS);
|
|
ip6_rt_put(rt);
|
|
return 0;
|
|
}
|
|
|
|
kfree_skb_list(frag);
|
|
|
|
IP6_INC_STATS(net, ip6_dst_idev(&rt->dst),
|
|
IPSTATS_MIB_FRAGFAILS);
|
|
ip6_rt_put(rt);
|
|
return err;
|
|
|
|
slow_path_clean:
|
|
skb_walk_frags(skb, frag2) {
|
|
if (frag2 == frag)
|
|
break;
|
|
frag2->sk = NULL;
|
|
frag2->destructor = NULL;
|
|
skb->truesize += frag2->truesize;
|
|
}
|
|
}
|
|
|
|
slow_path:
|
|
left = skb->len - hlen; /* Space per frame */
|
|
ptr = hlen; /* Where to start from */
|
|
|
|
/*
|
|
* Fragment the datagram.
|
|
*/
|
|
|
|
*prevhdr = NEXTHDR_FRAGMENT;
|
|
troom = rt->dst.dev->needed_tailroom;
|
|
|
|
/*
|
|
* Keep copying data until we run out.
|
|
*/
|
|
while (left > 0) {
|
|
len = left;
|
|
/* IF: it doesn't fit, use 'mtu' - the data space left */
|
|
if (len > mtu)
|
|
len = mtu;
|
|
/* IF: we are not sending up to and including the packet end
|
|
then align the next start on an eight byte boundary */
|
|
if (len < left) {
|
|
len &= ~7;
|
|
}
|
|
|
|
/* Allocate buffer */
|
|
frag = alloc_skb(len + hlen + sizeof(struct frag_hdr) +
|
|
hroom + troom, GFP_ATOMIC);
|
|
if (!frag) {
|
|
IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)),
|
|
IPSTATS_MIB_FRAGFAILS);
|
|
err = -ENOMEM;
|
|
goto fail;
|
|
}
|
|
|
|
/*
|
|
* Set up data on packet
|
|
*/
|
|
|
|
ip6_copy_metadata(frag, skb);
|
|
skb_reserve(frag, hroom);
|
|
skb_put(frag, len + hlen + sizeof(struct frag_hdr));
|
|
skb_reset_network_header(frag);
|
|
fh = (struct frag_hdr *)(skb_network_header(frag) + hlen);
|
|
frag->transport_header = (frag->network_header + hlen +
|
|
sizeof(struct frag_hdr));
|
|
|
|
/*
|
|
* Charge the memory for the fragment to any owner
|
|
* it might possess
|
|
*/
|
|
if (skb->sk)
|
|
skb_set_owner_w(frag, skb->sk);
|
|
|
|
/*
|
|
* Copy the packet header into the new buffer.
|
|
*/
|
|
skb_copy_from_linear_data(skb, skb_network_header(frag), hlen);
|
|
|
|
/*
|
|
* Build fragment header.
|
|
*/
|
|
fh->nexthdr = nexthdr;
|
|
fh->reserved = 0;
|
|
fh->identification = frag_id;
|
|
|
|
/*
|
|
* Copy a block of the IP datagram.
|
|
*/
|
|
BUG_ON(skb_copy_bits(skb, ptr, skb_transport_header(frag),
|
|
len));
|
|
left -= len;
|
|
|
|
fh->frag_off = htons(offset);
|
|
if (left > 0)
|
|
fh->frag_off |= htons(IP6_MF);
|
|
ipv6_hdr(frag)->payload_len = htons(frag->len -
|
|
sizeof(struct ipv6hdr));
|
|
|
|
ptr += len;
|
|
offset += len;
|
|
|
|
/*
|
|
* Put this fragment into the sending queue.
|
|
*/
|
|
err = output(net, sk, frag);
|
|
if (err)
|
|
goto fail;
|
|
|
|
IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)),
|
|
IPSTATS_MIB_FRAGCREATES);
|
|
}
|
|
IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)),
|
|
IPSTATS_MIB_FRAGOKS);
|
|
consume_skb(skb);
|
|
return err;
|
|
|
|
fail_toobig:
|
|
if (skb->sk && dst_allfrag(skb_dst(skb)))
|
|
sk_nocaps_add(skb->sk, NETIF_F_GSO_MASK);
|
|
|
|
skb->dev = skb_dst(skb)->dev;
|
|
icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
|
|
err = -EMSGSIZE;
|
|
|
|
fail:
|
|
IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)),
|
|
IPSTATS_MIB_FRAGFAILS);
|
|
kfree_skb(skb);
|
|
return err;
|
|
}
|
|
|
|
static inline int ip6_rt_check(const struct rt6key *rt_key,
|
|
const struct in6_addr *fl_addr,
|
|
const struct in6_addr *addr_cache)
|
|
{
|
|
return (rt_key->plen != 128 || !ipv6_addr_equal(fl_addr, &rt_key->addr)) &&
|
|
(!addr_cache || !ipv6_addr_equal(fl_addr, addr_cache));
|
|
}
|
|
|
|
static struct dst_entry *ip6_sk_dst_check(struct sock *sk,
|
|
struct dst_entry *dst,
|
|
const struct flowi6 *fl6)
|
|
{
|
|
struct ipv6_pinfo *np = inet6_sk(sk);
|
|
struct rt6_info *rt;
|
|
|
|
if (!dst)
|
|
goto out;
|
|
|
|
if (dst->ops->family != AF_INET6) {
|
|
dst_release(dst);
|
|
return NULL;
|
|
}
|
|
|
|
rt = (struct rt6_info *)dst;
|
|
/* Yes, checking route validity in not connected
|
|
* case is not very simple. Take into account,
|
|
* that we do not support routing by source, TOS,
|
|
* and MSG_DONTROUTE --ANK (980726)
|
|
*
|
|
* 1. ip6_rt_check(): If route was host route,
|
|
* check that cached destination is current.
|
|
* If it is network route, we still may
|
|
* check its validity using saved pointer
|
|
* to the last used address: daddr_cache.
|
|
* We do not want to save whole address now,
|
|
* (because main consumer of this service
|
|
* is tcp, which has not this problem),
|
|
* so that the last trick works only on connected
|
|
* sockets.
|
|
* 2. oif also should be the same.
|
|
*/
|
|
if (ip6_rt_check(&rt->rt6i_dst, &fl6->daddr, np->daddr_cache) ||
|
|
#ifdef CONFIG_IPV6_SUBTREES
|
|
ip6_rt_check(&rt->rt6i_src, &fl6->saddr, np->saddr_cache) ||
|
|
#endif
|
|
(!(fl6->flowi6_flags & FLOWI_FLAG_SKIP_NH_OIF) &&
|
|
(fl6->flowi6_oif && fl6->flowi6_oif != dst->dev->ifindex))) {
|
|
dst_release(dst);
|
|
dst = NULL;
|
|
}
|
|
|
|
out:
|
|
return dst;
|
|
}
|
|
|
|
static int ip6_dst_lookup_tail(struct net *net, const struct sock *sk,
|
|
struct dst_entry **dst, struct flowi6 *fl6)
|
|
{
|
|
#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
|
|
struct neighbour *n;
|
|
struct rt6_info *rt;
|
|
#endif
|
|
int err;
|
|
int flags = 0;
|
|
|
|
/* The correct way to handle this would be to do
|
|
* ip6_route_get_saddr, and then ip6_route_output; however,
|
|
* the route-specific preferred source forces the
|
|
* ip6_route_output call _before_ ip6_route_get_saddr.
|
|
*
|
|
* In source specific routing (no src=any default route),
|
|
* ip6_route_output will fail given src=any saddr, though, so
|
|
* that's why we try it again later.
|
|
*/
|
|
if (ipv6_addr_any(&fl6->saddr) && (!*dst || !(*dst)->error)) {
|
|
struct rt6_info *rt;
|
|
bool had_dst = *dst != NULL;
|
|
|
|
if (!had_dst)
|
|
*dst = ip6_route_output(net, sk, fl6);
|
|
rt = (*dst)->error ? NULL : (struct rt6_info *)*dst;
|
|
err = ip6_route_get_saddr(net, rt, &fl6->daddr,
|
|
sk ? inet6_sk(sk)->srcprefs : 0,
|
|
&fl6->saddr);
|
|
if (err)
|
|
goto out_err_release;
|
|
|
|
/* If we had an erroneous initial result, pretend it
|
|
* never existed and let the SA-enabled version take
|
|
* over.
|
|
*/
|
|
if (!had_dst && (*dst)->error) {
|
|
dst_release(*dst);
|
|
*dst = NULL;
|
|
}
|
|
|
|
if (fl6->flowi6_oif)
|
|
flags |= RT6_LOOKUP_F_IFACE;
|
|
}
|
|
|
|
if (!*dst)
|
|
*dst = ip6_route_output_flags(net, sk, fl6, flags);
|
|
|
|
err = (*dst)->error;
|
|
if (err)
|
|
goto out_err_release;
|
|
|
|
#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
|
|
/*
|
|
* Here if the dst entry we've looked up
|
|
* has a neighbour entry that is in the INCOMPLETE
|
|
* state and the src address from the flow is
|
|
* marked as OPTIMISTIC, we release the found
|
|
* dst entry and replace it instead with the
|
|
* dst entry of the nexthop router
|
|
*/
|
|
rt = (struct rt6_info *) *dst;
|
|
rcu_read_lock_bh();
|
|
n = __ipv6_neigh_lookup_noref(rt->dst.dev,
|
|
rt6_nexthop(rt, &fl6->daddr));
|
|
err = n && !(n->nud_state & NUD_VALID) ? -EINVAL : 0;
|
|
rcu_read_unlock_bh();
|
|
|
|
if (err) {
|
|
struct inet6_ifaddr *ifp;
|
|
struct flowi6 fl_gw6;
|
|
int redirect;
|
|
|
|
ifp = ipv6_get_ifaddr(net, &fl6->saddr,
|
|
(*dst)->dev, 1);
|
|
|
|
redirect = (ifp && ifp->flags & IFA_F_OPTIMISTIC);
|
|
if (ifp)
|
|
in6_ifa_put(ifp);
|
|
|
|
if (redirect) {
|
|
/*
|
|
* We need to get the dst entry for the
|
|
* default router instead
|
|
*/
|
|
dst_release(*dst);
|
|
memcpy(&fl_gw6, fl6, sizeof(struct flowi6));
|
|
memset(&fl_gw6.daddr, 0, sizeof(struct in6_addr));
|
|
*dst = ip6_route_output(net, sk, &fl_gw6);
|
|
err = (*dst)->error;
|
|
if (err)
|
|
goto out_err_release;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
return 0;
|
|
|
|
out_err_release:
|
|
if (err == -ENETUNREACH)
|
|
IP6_INC_STATS(net, NULL, IPSTATS_MIB_OUTNOROUTES);
|
|
dst_release(*dst);
|
|
*dst = NULL;
|
|
return err;
|
|
}
|
|
|
|
/**
|
|
* ip6_dst_lookup - perform route lookup on flow
|
|
* @sk: socket which provides route info
|
|
* @dst: pointer to dst_entry * for result
|
|
* @fl6: flow to lookup
|
|
*
|
|
* This function performs a route lookup on the given flow.
|
|
*
|
|
* It returns zero on success, or a standard errno code on error.
|
|
*/
|
|
int ip6_dst_lookup(struct net *net, struct sock *sk, struct dst_entry **dst,
|
|
struct flowi6 *fl6)
|
|
{
|
|
*dst = NULL;
|
|
return ip6_dst_lookup_tail(net, sk, dst, fl6);
|
|
}
|
|
EXPORT_SYMBOL_GPL(ip6_dst_lookup);
|
|
|
|
/**
|
|
* ip6_dst_lookup_flow - perform route lookup on flow with ipsec
|
|
* @sk: socket which provides route info
|
|
* @fl6: flow to lookup
|
|
* @final_dst: final destination address for ipsec lookup
|
|
*
|
|
* This function performs a route lookup on the given flow.
|
|
*
|
|
* It returns a valid dst pointer on success, or a pointer encoded
|
|
* error code.
|
|
*/
|
|
struct dst_entry *ip6_dst_lookup_flow(const struct sock *sk, struct flowi6 *fl6,
|
|
const struct in6_addr *final_dst)
|
|
{
|
|
struct dst_entry *dst = NULL;
|
|
int err;
|
|
|
|
err = ip6_dst_lookup_tail(sock_net(sk), sk, &dst, fl6);
|
|
if (err)
|
|
return ERR_PTR(err);
|
|
if (final_dst)
|
|
fl6->daddr = *final_dst;
|
|
if (!fl6->flowi6_oif)
|
|
fl6->flowi6_oif = l3mdev_fib_oif(dst->dev);
|
|
|
|
return xfrm_lookup_route(sock_net(sk), dst, flowi6_to_flowi(fl6), sk, 0);
|
|
}
|
|
EXPORT_SYMBOL_GPL(ip6_dst_lookup_flow);
|
|
|
|
/**
|
|
* ip6_sk_dst_lookup_flow - perform socket cached route lookup on flow
|
|
* @sk: socket which provides the dst cache and route info
|
|
* @fl6: flow to lookup
|
|
* @final_dst: final destination address for ipsec lookup
|
|
*
|
|
* This function performs a route lookup on the given flow with the
|
|
* possibility of using the cached route in the socket if it is valid.
|
|
* It will take the socket dst lock when operating on the dst cache.
|
|
* As a result, this function can only be used in process context.
|
|
*
|
|
* It returns a valid dst pointer on success, or a pointer encoded
|
|
* error code.
|
|
*/
|
|
struct dst_entry *ip6_sk_dst_lookup_flow(struct sock *sk, struct flowi6 *fl6,
|
|
const struct in6_addr *final_dst)
|
|
{
|
|
struct dst_entry *dst = sk_dst_check(sk, inet6_sk(sk)->dst_cookie);
|
|
|
|
dst = ip6_sk_dst_check(sk, dst, fl6);
|
|
if (!dst)
|
|
dst = ip6_dst_lookup_flow(sk, fl6, final_dst);
|
|
|
|
return dst;
|
|
}
|
|
EXPORT_SYMBOL_GPL(ip6_sk_dst_lookup_flow);
|
|
|
|
static inline int ip6_ufo_append_data(struct sock *sk,
|
|
struct sk_buff_head *queue,
|
|
int getfrag(void *from, char *to, int offset, int len,
|
|
int odd, struct sk_buff *skb),
|
|
void *from, int length, int hh_len, int fragheaderlen,
|
|
int exthdrlen, int transhdrlen, int mtu,
|
|
unsigned int flags, const struct flowi6 *fl6)
|
|
|
|
{
|
|
struct sk_buff *skb;
|
|
int err;
|
|
|
|
/* There is support for UDP large send offload by network
|
|
* device, so create one single skb packet containing complete
|
|
* udp datagram
|
|
*/
|
|
skb = skb_peek_tail(queue);
|
|
if (!skb) {
|
|
skb = sock_alloc_send_skb(sk,
|
|
hh_len + fragheaderlen + transhdrlen + 20,
|
|
(flags & MSG_DONTWAIT), &err);
|
|
if (!skb)
|
|
return err;
|
|
|
|
/* reserve space for Hardware header */
|
|
skb_reserve(skb, hh_len);
|
|
|
|
/* create space for UDP/IP header */
|
|
skb_put(skb, fragheaderlen + transhdrlen);
|
|
|
|
/* initialize network header pointer */
|
|
skb_set_network_header(skb, exthdrlen);
|
|
|
|
/* initialize protocol header pointer */
|
|
skb->transport_header = skb->network_header + fragheaderlen;
|
|
|
|
skb->protocol = htons(ETH_P_IPV6);
|
|
skb->csum = 0;
|
|
|
|
__skb_queue_tail(queue, skb);
|
|
} else if (skb_is_gso(skb)) {
|
|
goto append;
|
|
}
|
|
|
|
skb->ip_summed = CHECKSUM_PARTIAL;
|
|
/* Specify the length of each IPv6 datagram fragment.
|
|
* It has to be a multiple of 8.
|
|
*/
|
|
skb_shinfo(skb)->gso_size = (mtu - fragheaderlen -
|
|
sizeof(struct frag_hdr)) & ~7;
|
|
skb_shinfo(skb)->gso_type = SKB_GSO_UDP;
|
|
skb_shinfo(skb)->ip6_frag_id = ipv6_select_ident(sock_net(sk),
|
|
&fl6->daddr,
|
|
&fl6->saddr);
|
|
|
|
append:
|
|
return skb_append_datato_frags(sk, skb, getfrag, from,
|
|
(length - transhdrlen));
|
|
}
|
|
|
|
static inline struct ipv6_opt_hdr *ip6_opt_dup(struct ipv6_opt_hdr *src,
|
|
gfp_t gfp)
|
|
{
|
|
return src ? kmemdup(src, (src->hdrlen + 1) * 8, gfp) : NULL;
|
|
}
|
|
|
|
static inline struct ipv6_rt_hdr *ip6_rthdr_dup(struct ipv6_rt_hdr *src,
|
|
gfp_t gfp)
|
|
{
|
|
return src ? kmemdup(src, (src->hdrlen + 1) * 8, gfp) : NULL;
|
|
}
|
|
|
|
static void ip6_append_data_mtu(unsigned int *mtu,
|
|
int *maxfraglen,
|
|
unsigned int fragheaderlen,
|
|
struct sk_buff *skb,
|
|
struct rt6_info *rt,
|
|
unsigned int orig_mtu)
|
|
{
|
|
if (!(rt->dst.flags & DST_XFRM_TUNNEL)) {
|
|
if (!skb) {
|
|
/* first fragment, reserve header_len */
|
|
*mtu = orig_mtu - rt->dst.header_len;
|
|
|
|
} else {
|
|
/*
|
|
* this fragment is not first, the headers
|
|
* space is regarded as data space.
|
|
*/
|
|
*mtu = orig_mtu;
|
|
}
|
|
*maxfraglen = ((*mtu - fragheaderlen) & ~7)
|
|
+ fragheaderlen - sizeof(struct frag_hdr);
|
|
}
|
|
}
|
|
|
|
static int ip6_setup_cork(struct sock *sk, struct inet_cork_full *cork,
|
|
struct inet6_cork *v6_cork, struct ipcm6_cookie *ipc6,
|
|
struct rt6_info *rt, struct flowi6 *fl6)
|
|
{
|
|
struct ipv6_pinfo *np = inet6_sk(sk);
|
|
unsigned int mtu;
|
|
struct ipv6_txoptions *opt = ipc6->opt;
|
|
|
|
/*
|
|
* setup for corking
|
|
*/
|
|
if (opt) {
|
|
if (WARN_ON(v6_cork->opt))
|
|
return -EINVAL;
|
|
|
|
v6_cork->opt = kzalloc(opt->tot_len, sk->sk_allocation);
|
|
if (unlikely(!v6_cork->opt))
|
|
return -ENOBUFS;
|
|
|
|
v6_cork->opt->tot_len = opt->tot_len;
|
|
v6_cork->opt->opt_flen = opt->opt_flen;
|
|
v6_cork->opt->opt_nflen = opt->opt_nflen;
|
|
|
|
v6_cork->opt->dst0opt = ip6_opt_dup(opt->dst0opt,
|
|
sk->sk_allocation);
|
|
if (opt->dst0opt && !v6_cork->opt->dst0opt)
|
|
return -ENOBUFS;
|
|
|
|
v6_cork->opt->dst1opt = ip6_opt_dup(opt->dst1opt,
|
|
sk->sk_allocation);
|
|
if (opt->dst1opt && !v6_cork->opt->dst1opt)
|
|
return -ENOBUFS;
|
|
|
|
v6_cork->opt->hopopt = ip6_opt_dup(opt->hopopt,
|
|
sk->sk_allocation);
|
|
if (opt->hopopt && !v6_cork->opt->hopopt)
|
|
return -ENOBUFS;
|
|
|
|
v6_cork->opt->srcrt = ip6_rthdr_dup(opt->srcrt,
|
|
sk->sk_allocation);
|
|
if (opt->srcrt && !v6_cork->opt->srcrt)
|
|
return -ENOBUFS;
|
|
|
|
/* need source address above miyazawa*/
|
|
}
|
|
dst_hold(&rt->dst);
|
|
cork->base.dst = &rt->dst;
|
|
cork->fl.u.ip6 = *fl6;
|
|
v6_cork->hop_limit = ipc6->hlimit;
|
|
v6_cork->tclass = ipc6->tclass;
|
|
if (rt->dst.flags & DST_XFRM_TUNNEL)
|
|
mtu = np->pmtudisc >= IPV6_PMTUDISC_PROBE ?
|
|
rt->dst.dev->mtu : dst_mtu(&rt->dst);
|
|
else
|
|
mtu = np->pmtudisc >= IPV6_PMTUDISC_PROBE ?
|
|
rt->dst.dev->mtu : dst_mtu(rt->dst.path);
|
|
if (np->frag_size < mtu) {
|
|
if (np->frag_size)
|
|
mtu = np->frag_size;
|
|
}
|
|
cork->base.fragsize = mtu;
|
|
if (dst_allfrag(rt->dst.path))
|
|
cork->base.flags |= IPCORK_ALLFRAG;
|
|
cork->base.length = 0;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __ip6_append_data(struct sock *sk,
|
|
struct flowi6 *fl6,
|
|
struct sk_buff_head *queue,
|
|
struct inet_cork *cork,
|
|
struct inet6_cork *v6_cork,
|
|
struct page_frag *pfrag,
|
|
int getfrag(void *from, char *to, int offset,
|
|
int len, int odd, struct sk_buff *skb),
|
|
void *from, int length, int transhdrlen,
|
|
unsigned int flags, struct ipcm6_cookie *ipc6,
|
|
const struct sockcm_cookie *sockc)
|
|
{
|
|
struct sk_buff *skb, *skb_prev = NULL;
|
|
unsigned int maxfraglen, fragheaderlen, mtu, orig_mtu;
|
|
int exthdrlen = 0;
|
|
int dst_exthdrlen = 0;
|
|
int hh_len;
|
|
int copy;
|
|
int err;
|
|
int offset = 0;
|
|
__u8 tx_flags = 0;
|
|
u32 tskey = 0;
|
|
struct rt6_info *rt = (struct rt6_info *)cork->dst;
|
|
struct ipv6_txoptions *opt = v6_cork->opt;
|
|
int csummode = CHECKSUM_NONE;
|
|
unsigned int maxnonfragsize, headersize;
|
|
|
|
skb = skb_peek_tail(queue);
|
|
if (!skb) {
|
|
exthdrlen = opt ? opt->opt_flen : 0;
|
|
dst_exthdrlen = rt->dst.header_len - rt->rt6i_nfheader_len;
|
|
}
|
|
|
|
mtu = cork->fragsize;
|
|
orig_mtu = mtu;
|
|
|
|
hh_len = LL_RESERVED_SPACE(rt->dst.dev);
|
|
|
|
fragheaderlen = sizeof(struct ipv6hdr) + rt->rt6i_nfheader_len +
|
|
(opt ? opt->opt_nflen : 0);
|
|
maxfraglen = ((mtu - fragheaderlen) & ~7) + fragheaderlen -
|
|
sizeof(struct frag_hdr);
|
|
|
|
headersize = sizeof(struct ipv6hdr) +
|
|
(opt ? opt->opt_flen + opt->opt_nflen : 0) +
|
|
(dst_allfrag(&rt->dst) ?
|
|
sizeof(struct frag_hdr) : 0) +
|
|
rt->rt6i_nfheader_len;
|
|
|
|
if (cork->length + length > mtu - headersize && ipc6->dontfrag &&
|
|
(sk->sk_protocol == IPPROTO_UDP ||
|
|
sk->sk_protocol == IPPROTO_RAW)) {
|
|
ipv6_local_rxpmtu(sk, fl6, mtu - headersize +
|
|
sizeof(struct ipv6hdr));
|
|
goto emsgsize;
|
|
}
|
|
|
|
if (ip6_sk_ignore_df(sk))
|
|
maxnonfragsize = sizeof(struct ipv6hdr) + IPV6_MAXPLEN;
|
|
else
|
|
maxnonfragsize = mtu;
|
|
|
|
if (cork->length + length > maxnonfragsize - headersize) {
|
|
emsgsize:
|
|
ipv6_local_error(sk, EMSGSIZE, fl6,
|
|
mtu - headersize +
|
|
sizeof(struct ipv6hdr));
|
|
return -EMSGSIZE;
|
|
}
|
|
|
|
/* CHECKSUM_PARTIAL only with no extension headers and when
|
|
* we are not going to fragment
|
|
*/
|
|
if (transhdrlen && sk->sk_protocol == IPPROTO_UDP &&
|
|
headersize == sizeof(struct ipv6hdr) &&
|
|
length < mtu - headersize &&
|
|
!(flags & MSG_MORE) &&
|
|
rt->dst.dev->features & (NETIF_F_IPV6_CSUM | NETIF_F_HW_CSUM))
|
|
csummode = CHECKSUM_PARTIAL;
|
|
|
|
if (sk->sk_type == SOCK_DGRAM || sk->sk_type == SOCK_RAW) {
|
|
sock_tx_timestamp(sk, sockc->tsflags, &tx_flags);
|
|
if (tx_flags & SKBTX_ANY_SW_TSTAMP &&
|
|
sk->sk_tsflags & SOF_TIMESTAMPING_OPT_ID)
|
|
tskey = sk->sk_tskey++;
|
|
}
|
|
|
|
/*
|
|
* Let's try using as much space as possible.
|
|
* Use MTU if total length of the message fits into the MTU.
|
|
* Otherwise, we need to reserve fragment header and
|
|
* fragment alignment (= 8-15 octects, in total).
|
|
*
|
|
* Note that we may need to "move" the data from the tail of
|
|
* of the buffer to the new fragment when we split
|
|
* the message.
|
|
*
|
|
* FIXME: It may be fragmented into multiple chunks
|
|
* at once if non-fragmentable extension headers
|
|
* are too large.
|
|
* --yoshfuji
|
|
*/
|
|
|
|
cork->length += length;
|
|
if (((length > mtu) ||
|
|
(skb && skb_is_gso(skb))) &&
|
|
(sk->sk_protocol == IPPROTO_UDP) &&
|
|
(rt->dst.dev->features & NETIF_F_UFO) &&
|
|
(sk->sk_type == SOCK_DGRAM) && !udp_get_no_check6_tx(sk)) {
|
|
err = ip6_ufo_append_data(sk, queue, getfrag, from, length,
|
|
hh_len, fragheaderlen, exthdrlen,
|
|
transhdrlen, mtu, flags, fl6);
|
|
if (err)
|
|
goto error;
|
|
return 0;
|
|
}
|
|
|
|
if (!skb)
|
|
goto alloc_new_skb;
|
|
|
|
while (length > 0) {
|
|
/* Check if the remaining data fits into current packet. */
|
|
copy = (cork->length <= mtu && !(cork->flags & IPCORK_ALLFRAG) ? mtu : maxfraglen) - skb->len;
|
|
if (copy < length)
|
|
copy = maxfraglen - skb->len;
|
|
|
|
if (copy <= 0) {
|
|
char *data;
|
|
unsigned int datalen;
|
|
unsigned int fraglen;
|
|
unsigned int fraggap;
|
|
unsigned int alloclen;
|
|
alloc_new_skb:
|
|
/* There's no room in the current skb */
|
|
if (skb)
|
|
fraggap = skb->len - maxfraglen;
|
|
else
|
|
fraggap = 0;
|
|
/* update mtu and maxfraglen if necessary */
|
|
if (!skb || !skb_prev)
|
|
ip6_append_data_mtu(&mtu, &maxfraglen,
|
|
fragheaderlen, skb, rt,
|
|
orig_mtu);
|
|
|
|
skb_prev = skb;
|
|
|
|
/*
|
|
* If remaining data exceeds the mtu,
|
|
* we know we need more fragment(s).
|
|
*/
|
|
datalen = length + fraggap;
|
|
|
|
if (datalen > (cork->length <= mtu && !(cork->flags & IPCORK_ALLFRAG) ? mtu : maxfraglen) - fragheaderlen)
|
|
datalen = maxfraglen - fragheaderlen - rt->dst.trailer_len;
|
|
if ((flags & MSG_MORE) &&
|
|
!(rt->dst.dev->features&NETIF_F_SG))
|
|
alloclen = mtu;
|
|
else
|
|
alloclen = datalen + fragheaderlen;
|
|
|
|
alloclen += dst_exthdrlen;
|
|
|
|
if (datalen != length + fraggap) {
|
|
/*
|
|
* this is not the last fragment, the trailer
|
|
* space is regarded as data space.
|
|
*/
|
|
datalen += rt->dst.trailer_len;
|
|
}
|
|
|
|
alloclen += rt->dst.trailer_len;
|
|
fraglen = datalen + fragheaderlen;
|
|
|
|
/*
|
|
* We just reserve space for fragment header.
|
|
* Note: this may be overallocation if the message
|
|
* (without MSG_MORE) fits into the MTU.
|
|
*/
|
|
alloclen += sizeof(struct frag_hdr);
|
|
|
|
if (transhdrlen) {
|
|
skb = sock_alloc_send_skb(sk,
|
|
alloclen + hh_len,
|
|
(flags & MSG_DONTWAIT), &err);
|
|
} else {
|
|
skb = NULL;
|
|
if (atomic_read(&sk->sk_wmem_alloc) <=
|
|
2 * sk->sk_sndbuf)
|
|
skb = sock_wmalloc(sk,
|
|
alloclen + hh_len, 1,
|
|
sk->sk_allocation);
|
|
if (unlikely(!skb))
|
|
err = -ENOBUFS;
|
|
}
|
|
if (!skb)
|
|
goto error;
|
|
/*
|
|
* Fill in the control structures
|
|
*/
|
|
skb->protocol = htons(ETH_P_IPV6);
|
|
skb->ip_summed = csummode;
|
|
skb->csum = 0;
|
|
/* reserve for fragmentation and ipsec header */
|
|
skb_reserve(skb, hh_len + sizeof(struct frag_hdr) +
|
|
dst_exthdrlen);
|
|
|
|
/* Only the initial fragment is time stamped */
|
|
skb_shinfo(skb)->tx_flags = tx_flags;
|
|
tx_flags = 0;
|
|
skb_shinfo(skb)->tskey = tskey;
|
|
tskey = 0;
|
|
|
|
/*
|
|
* Find where to start putting bytes
|
|
*/
|
|
data = skb_put(skb, fraglen);
|
|
skb_set_network_header(skb, exthdrlen);
|
|
data += fragheaderlen;
|
|
skb->transport_header = (skb->network_header +
|
|
fragheaderlen);
|
|
if (fraggap) {
|
|
skb->csum = skb_copy_and_csum_bits(
|
|
skb_prev, maxfraglen,
|
|
data + transhdrlen, fraggap, 0);
|
|
skb_prev->csum = csum_sub(skb_prev->csum,
|
|
skb->csum);
|
|
data += fraggap;
|
|
pskb_trim_unique(skb_prev, maxfraglen);
|
|
}
|
|
copy = datalen - transhdrlen - fraggap;
|
|
|
|
if (copy < 0) {
|
|
err = -EINVAL;
|
|
kfree_skb(skb);
|
|
goto error;
|
|
} else if (copy > 0 && getfrag(from, data + transhdrlen, offset, copy, fraggap, skb) < 0) {
|
|
err = -EFAULT;
|
|
kfree_skb(skb);
|
|
goto error;
|
|
}
|
|
|
|
offset += copy;
|
|
length -= datalen - fraggap;
|
|
transhdrlen = 0;
|
|
exthdrlen = 0;
|
|
dst_exthdrlen = 0;
|
|
|
|
/*
|
|
* Put the packet on the pending queue
|
|
*/
|
|
__skb_queue_tail(queue, skb);
|
|
continue;
|
|
}
|
|
|
|
if (copy > length)
|
|
copy = length;
|
|
|
|
if (!(rt->dst.dev->features&NETIF_F_SG)) {
|
|
unsigned int off;
|
|
|
|
off = skb->len;
|
|
if (getfrag(from, skb_put(skb, copy),
|
|
offset, copy, off, skb) < 0) {
|
|
__skb_trim(skb, off);
|
|
err = -EFAULT;
|
|
goto error;
|
|
}
|
|
} else {
|
|
int i = skb_shinfo(skb)->nr_frags;
|
|
|
|
err = -ENOMEM;
|
|
if (!sk_page_frag_refill(sk, pfrag))
|
|
goto error;
|
|
|
|
if (!skb_can_coalesce(skb, i, pfrag->page,
|
|
pfrag->offset)) {
|
|
err = -EMSGSIZE;
|
|
if (i == MAX_SKB_FRAGS)
|
|
goto error;
|
|
|
|
__skb_fill_page_desc(skb, i, pfrag->page,
|
|
pfrag->offset, 0);
|
|
skb_shinfo(skb)->nr_frags = ++i;
|
|
get_page(pfrag->page);
|
|
}
|
|
copy = min_t(int, copy, pfrag->size - pfrag->offset);
|
|
if (getfrag(from,
|
|
page_address(pfrag->page) + pfrag->offset,
|
|
offset, copy, skb->len, skb) < 0)
|
|
goto error_efault;
|
|
|
|
pfrag->offset += copy;
|
|
skb_frag_size_add(&skb_shinfo(skb)->frags[i - 1], copy);
|
|
skb->len += copy;
|
|
skb->data_len += copy;
|
|
skb->truesize += copy;
|
|
atomic_add(copy, &sk->sk_wmem_alloc);
|
|
}
|
|
offset += copy;
|
|
length -= copy;
|
|
}
|
|
|
|
return 0;
|
|
|
|
error_efault:
|
|
err = -EFAULT;
|
|
error:
|
|
cork->length -= length;
|
|
IP6_INC_STATS(sock_net(sk), rt->rt6i_idev, IPSTATS_MIB_OUTDISCARDS);
|
|
return err;
|
|
}
|
|
|
|
int ip6_append_data(struct sock *sk,
|
|
int getfrag(void *from, char *to, int offset, int len,
|
|
int odd, struct sk_buff *skb),
|
|
void *from, int length, int transhdrlen,
|
|
struct ipcm6_cookie *ipc6, struct flowi6 *fl6,
|
|
struct rt6_info *rt, unsigned int flags,
|
|
const struct sockcm_cookie *sockc)
|
|
{
|
|
struct inet_sock *inet = inet_sk(sk);
|
|
struct ipv6_pinfo *np = inet6_sk(sk);
|
|
int exthdrlen;
|
|
int err;
|
|
|
|
if (flags&MSG_PROBE)
|
|
return 0;
|
|
if (skb_queue_empty(&sk->sk_write_queue)) {
|
|
/*
|
|
* setup for corking
|
|
*/
|
|
err = ip6_setup_cork(sk, &inet->cork, &np->cork,
|
|
ipc6, rt, fl6);
|
|
if (err)
|
|
return err;
|
|
|
|
exthdrlen = (ipc6->opt ? ipc6->opt->opt_flen : 0);
|
|
length += exthdrlen;
|
|
transhdrlen += exthdrlen;
|
|
} else {
|
|
fl6 = &inet->cork.fl.u.ip6;
|
|
transhdrlen = 0;
|
|
}
|
|
|
|
return __ip6_append_data(sk, fl6, &sk->sk_write_queue, &inet->cork.base,
|
|
&np->cork, sk_page_frag(sk), getfrag,
|
|
from, length, transhdrlen, flags, ipc6, sockc);
|
|
}
|
|
EXPORT_SYMBOL_GPL(ip6_append_data);
|
|
|
|
static void ip6_cork_release(struct inet_cork_full *cork,
|
|
struct inet6_cork *v6_cork)
|
|
{
|
|
if (v6_cork->opt) {
|
|
kfree(v6_cork->opt->dst0opt);
|
|
kfree(v6_cork->opt->dst1opt);
|
|
kfree(v6_cork->opt->hopopt);
|
|
kfree(v6_cork->opt->srcrt);
|
|
kfree(v6_cork->opt);
|
|
v6_cork->opt = NULL;
|
|
}
|
|
|
|
if (cork->base.dst) {
|
|
dst_release(cork->base.dst);
|
|
cork->base.dst = NULL;
|
|
cork->base.flags &= ~IPCORK_ALLFRAG;
|
|
}
|
|
memset(&cork->fl, 0, sizeof(cork->fl));
|
|
}
|
|
|
|
struct sk_buff *__ip6_make_skb(struct sock *sk,
|
|
struct sk_buff_head *queue,
|
|
struct inet_cork_full *cork,
|
|
struct inet6_cork *v6_cork)
|
|
{
|
|
struct sk_buff *skb, *tmp_skb;
|
|
struct sk_buff **tail_skb;
|
|
struct in6_addr final_dst_buf, *final_dst = &final_dst_buf;
|
|
struct ipv6_pinfo *np = inet6_sk(sk);
|
|
struct net *net = sock_net(sk);
|
|
struct ipv6hdr *hdr;
|
|
struct ipv6_txoptions *opt = v6_cork->opt;
|
|
struct rt6_info *rt = (struct rt6_info *)cork->base.dst;
|
|
struct flowi6 *fl6 = &cork->fl.u.ip6;
|
|
unsigned char proto = fl6->flowi6_proto;
|
|
|
|
skb = __skb_dequeue(queue);
|
|
if (!skb)
|
|
goto out;
|
|
tail_skb = &(skb_shinfo(skb)->frag_list);
|
|
|
|
/* move skb->data to ip header from ext header */
|
|
if (skb->data < skb_network_header(skb))
|
|
__skb_pull(skb, skb_network_offset(skb));
|
|
while ((tmp_skb = __skb_dequeue(queue)) != NULL) {
|
|
__skb_pull(tmp_skb, skb_network_header_len(skb));
|
|
*tail_skb = tmp_skb;
|
|
tail_skb = &(tmp_skb->next);
|
|
skb->len += tmp_skb->len;
|
|
skb->data_len += tmp_skb->len;
|
|
skb->truesize += tmp_skb->truesize;
|
|
tmp_skb->destructor = NULL;
|
|
tmp_skb->sk = NULL;
|
|
}
|
|
|
|
/* Allow local fragmentation. */
|
|
skb->ignore_df = ip6_sk_ignore_df(sk);
|
|
|
|
*final_dst = fl6->daddr;
|
|
__skb_pull(skb, skb_network_header_len(skb));
|
|
if (opt && opt->opt_flen)
|
|
ipv6_push_frag_opts(skb, opt, &proto);
|
|
if (opt && opt->opt_nflen)
|
|
ipv6_push_nfrag_opts(skb, opt, &proto, &final_dst);
|
|
|
|
skb_push(skb, sizeof(struct ipv6hdr));
|
|
skb_reset_network_header(skb);
|
|
hdr = ipv6_hdr(skb);
|
|
|
|
ip6_flow_hdr(hdr, v6_cork->tclass,
|
|
ip6_make_flowlabel(net, skb, fl6->flowlabel,
|
|
np->autoflowlabel, fl6));
|
|
hdr->hop_limit = v6_cork->hop_limit;
|
|
hdr->nexthdr = proto;
|
|
hdr->saddr = fl6->saddr;
|
|
hdr->daddr = *final_dst;
|
|
|
|
skb->priority = sk->sk_priority;
|
|
skb->mark = sk->sk_mark;
|
|
|
|
skb_dst_set(skb, dst_clone(&rt->dst));
|
|
IP6_UPD_PO_STATS(net, rt->rt6i_idev, IPSTATS_MIB_OUT, skb->len);
|
|
if (proto == IPPROTO_ICMPV6) {
|
|
struct inet6_dev *idev = ip6_dst_idev(skb_dst(skb));
|
|
|
|
ICMP6MSGOUT_INC_STATS(net, idev, icmp6_hdr(skb)->icmp6_type);
|
|
ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
|
|
}
|
|
|
|
ip6_cork_release(cork, v6_cork);
|
|
out:
|
|
return skb;
|
|
}
|
|
|
|
int ip6_send_skb(struct sk_buff *skb)
|
|
{
|
|
struct net *net = sock_net(skb->sk);
|
|
struct rt6_info *rt = (struct rt6_info *)skb_dst(skb);
|
|
int err;
|
|
|
|
err = ip6_local_out(net, skb->sk, skb);
|
|
if (err) {
|
|
if (err > 0)
|
|
err = net_xmit_errno(err);
|
|
if (err)
|
|
IP6_INC_STATS(net, rt->rt6i_idev,
|
|
IPSTATS_MIB_OUTDISCARDS);
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
int ip6_push_pending_frames(struct sock *sk)
|
|
{
|
|
struct sk_buff *skb;
|
|
|
|
skb = ip6_finish_skb(sk);
|
|
if (!skb)
|
|
return 0;
|
|
|
|
return ip6_send_skb(skb);
|
|
}
|
|
EXPORT_SYMBOL_GPL(ip6_push_pending_frames);
|
|
|
|
static void __ip6_flush_pending_frames(struct sock *sk,
|
|
struct sk_buff_head *queue,
|
|
struct inet_cork_full *cork,
|
|
struct inet6_cork *v6_cork)
|
|
{
|
|
struct sk_buff *skb;
|
|
|
|
while ((skb = __skb_dequeue_tail(queue)) != NULL) {
|
|
if (skb_dst(skb))
|
|
IP6_INC_STATS(sock_net(sk), ip6_dst_idev(skb_dst(skb)),
|
|
IPSTATS_MIB_OUTDISCARDS);
|
|
kfree_skb(skb);
|
|
}
|
|
|
|
ip6_cork_release(cork, v6_cork);
|
|
}
|
|
|
|
void ip6_flush_pending_frames(struct sock *sk)
|
|
{
|
|
__ip6_flush_pending_frames(sk, &sk->sk_write_queue,
|
|
&inet_sk(sk)->cork, &inet6_sk(sk)->cork);
|
|
}
|
|
EXPORT_SYMBOL_GPL(ip6_flush_pending_frames);
|
|
|
|
struct sk_buff *ip6_make_skb(struct sock *sk,
|
|
int getfrag(void *from, char *to, int offset,
|
|
int len, int odd, struct sk_buff *skb),
|
|
void *from, int length, int transhdrlen,
|
|
struct ipcm6_cookie *ipc6, struct flowi6 *fl6,
|
|
struct rt6_info *rt, unsigned int flags,
|
|
const struct sockcm_cookie *sockc)
|
|
{
|
|
struct inet_cork_full cork;
|
|
struct inet6_cork v6_cork;
|
|
struct sk_buff_head queue;
|
|
int exthdrlen = (ipc6->opt ? ipc6->opt->opt_flen : 0);
|
|
int err;
|
|
|
|
if (flags & MSG_PROBE)
|
|
return NULL;
|
|
|
|
__skb_queue_head_init(&queue);
|
|
|
|
cork.base.flags = 0;
|
|
cork.base.addr = 0;
|
|
cork.base.opt = NULL;
|
|
v6_cork.opt = NULL;
|
|
err = ip6_setup_cork(sk, &cork, &v6_cork, ipc6, rt, fl6);
|
|
if (err)
|
|
return ERR_PTR(err);
|
|
|
|
if (ipc6->dontfrag < 0)
|
|
ipc6->dontfrag = inet6_sk(sk)->dontfrag;
|
|
|
|
err = __ip6_append_data(sk, fl6, &queue, &cork.base, &v6_cork,
|
|
¤t->task_frag, getfrag, from,
|
|
length + exthdrlen, transhdrlen + exthdrlen,
|
|
flags, ipc6, sockc);
|
|
if (err) {
|
|
__ip6_flush_pending_frames(sk, &queue, &cork, &v6_cork);
|
|
return ERR_PTR(err);
|
|
}
|
|
|
|
return __ip6_make_skb(sk, &queue, &cork, &v6_cork);
|
|
}
|