mirror of
https://github.com/torvalds/linux.git
synced 2024-11-21 19:41:42 +00:00
Merge branch 'ipv6-lockless-dump-addrs'
Eric Dumazet says: ==================== ipv6: lockless inet6_dump_addr() This series removes RTNL locking to dump ipv6 addresses. ==================== Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller
commit
570c86ed60
@ -717,7 +717,7 @@ errout:
|
||||
static u32 inet6_base_seq(const struct net *net)
|
||||
{
|
||||
u32 res = atomic_read(&net->ipv6.dev_addr_genid) +
|
||||
net->dev_base_seq;
|
||||
READ_ONCE(net->dev_base_seq);
|
||||
|
||||
/* Must not return 0 (see nl_dump_check_consistent()).
|
||||
* Chose a value far away from 0.
|
||||
@ -2728,7 +2728,7 @@ int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
|
||||
if (update_lft) {
|
||||
ifp->valid_lft = valid_lft;
|
||||
ifp->prefered_lft = prefered_lft;
|
||||
ifp->tstamp = now;
|
||||
WRITE_ONCE(ifp->tstamp, now);
|
||||
flags = ifp->flags;
|
||||
ifp->flags &= ~IFA_F_DEPRECATED;
|
||||
spin_unlock_bh(&ifp->lock);
|
||||
@ -4896,13 +4896,13 @@ static int inet6_addr_modify(struct net *net, struct inet6_ifaddr *ifp,
|
||||
IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
|
||||
IFA_F_NOPREFIXROUTE);
|
||||
ifp->flags |= cfg->ifa_flags;
|
||||
ifp->tstamp = jiffies;
|
||||
ifp->valid_lft = cfg->valid_lft;
|
||||
ifp->prefered_lft = cfg->preferred_lft;
|
||||
ifp->ifa_proto = cfg->ifa_proto;
|
||||
WRITE_ONCE(ifp->tstamp, jiffies);
|
||||
WRITE_ONCE(ifp->valid_lft, cfg->valid_lft);
|
||||
WRITE_ONCE(ifp->prefered_lft, cfg->preferred_lft);
|
||||
WRITE_ONCE(ifp->ifa_proto, cfg->ifa_proto);
|
||||
|
||||
if (cfg->rt_priority && cfg->rt_priority != ifp->rt_priority)
|
||||
ifp->rt_priority = cfg->rt_priority;
|
||||
WRITE_ONCE(ifp->rt_priority, cfg->rt_priority);
|
||||
|
||||
if (new_peer)
|
||||
ifp->peer_addr = *cfg->peer_pfx;
|
||||
@ -5123,17 +5123,21 @@ struct inet6_fill_args {
|
||||
enum addr_type_t type;
|
||||
};
|
||||
|
||||
static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
|
||||
static int inet6_fill_ifaddr(struct sk_buff *skb,
|
||||
const struct inet6_ifaddr *ifa,
|
||||
struct inet6_fill_args *args)
|
||||
{
|
||||
struct nlmsghdr *nlh;
|
||||
struct nlmsghdr *nlh;
|
||||
u32 preferred, valid;
|
||||
u32 flags, priority;
|
||||
u8 proto;
|
||||
|
||||
nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
|
||||
sizeof(struct ifaddrmsg), args->flags);
|
||||
if (!nlh)
|
||||
return -EMSGSIZE;
|
||||
|
||||
flags = READ_ONCE(ifa->flags);
|
||||
put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
|
||||
ifa->idev->dev->ifindex);
|
||||
|
||||
@ -5141,13 +5145,14 @@ static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
|
||||
nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid))
|
||||
goto error;
|
||||
|
||||
spin_lock_bh(&ifa->lock);
|
||||
if (!((ifa->flags&IFA_F_PERMANENT) &&
|
||||
(ifa->prefered_lft == INFINITY_LIFE_TIME))) {
|
||||
preferred = ifa->prefered_lft;
|
||||
valid = ifa->valid_lft;
|
||||
preferred = READ_ONCE(ifa->prefered_lft);
|
||||
valid = READ_ONCE(ifa->valid_lft);
|
||||
|
||||
if (!((flags & IFA_F_PERMANENT) &&
|
||||
(preferred == INFINITY_LIFE_TIME))) {
|
||||
if (preferred != INFINITY_LIFE_TIME) {
|
||||
long tval = (jiffies - ifa->tstamp)/HZ;
|
||||
long tval = (jiffies - READ_ONCE(ifa->tstamp)) / HZ;
|
||||
|
||||
if (preferred > tval)
|
||||
preferred -= tval;
|
||||
else
|
||||
@ -5163,28 +5168,29 @@ static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
|
||||
preferred = INFINITY_LIFE_TIME;
|
||||
valid = INFINITY_LIFE_TIME;
|
||||
}
|
||||
spin_unlock_bh(&ifa->lock);
|
||||
|
||||
if (!ipv6_addr_any(&ifa->peer_addr)) {
|
||||
if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
|
||||
nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
|
||||
goto error;
|
||||
} else
|
||||
} else {
|
||||
if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
|
||||
goto error;
|
||||
}
|
||||
|
||||
if (ifa->rt_priority &&
|
||||
nla_put_u32(skb, IFA_RT_PRIORITY, ifa->rt_priority))
|
||||
priority = READ_ONCE(ifa->rt_priority);
|
||||
if (priority && nla_put_u32(skb, IFA_RT_PRIORITY, priority))
|
||||
goto error;
|
||||
|
||||
if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
|
||||
if (put_cacheinfo(skb, ifa->cstamp, READ_ONCE(ifa->tstamp),
|
||||
preferred, valid) < 0)
|
||||
goto error;
|
||||
|
||||
if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
|
||||
if (nla_put_u32(skb, IFA_FLAGS, flags) < 0)
|
||||
goto error;
|
||||
|
||||
if (ifa->ifa_proto &&
|
||||
nla_put_u8(skb, IFA_PROTO, ifa->ifa_proto))
|
||||
proto = READ_ONCE(ifa->ifa_proto);
|
||||
if (proto && nla_put_u8(skb, IFA_PROTO, proto))
|
||||
goto error;
|
||||
|
||||
nlmsg_end(skb, nlh);
|
||||
@ -5195,12 +5201,13 @@ error:
|
||||
return -EMSGSIZE;
|
||||
}
|
||||
|
||||
static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
|
||||
static int inet6_fill_ifmcaddr(struct sk_buff *skb,
|
||||
const struct ifmcaddr6 *ifmca,
|
||||
struct inet6_fill_args *args)
|
||||
{
|
||||
struct nlmsghdr *nlh;
|
||||
u8 scope = RT_SCOPE_UNIVERSE;
|
||||
int ifindex = ifmca->idev->dev->ifindex;
|
||||
u8 scope = RT_SCOPE_UNIVERSE;
|
||||
struct nlmsghdr *nlh;
|
||||
|
||||
if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
|
||||
scope = RT_SCOPE_SITE;
|
||||
@ -5218,7 +5225,7 @@ static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
|
||||
|
||||
put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
|
||||
if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
|
||||
put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
|
||||
put_cacheinfo(skb, ifmca->mca_cstamp, READ_ONCE(ifmca->mca_tstamp),
|
||||
INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
|
||||
nlmsg_cancel(skb, nlh);
|
||||
return -EMSGSIZE;
|
||||
@ -5228,13 +5235,14 @@ static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
|
||||
static int inet6_fill_ifacaddr(struct sk_buff *skb,
|
||||
const struct ifacaddr6 *ifaca,
|
||||
struct inet6_fill_args *args)
|
||||
{
|
||||
struct net_device *dev = fib6_info_nh_dev(ifaca->aca_rt);
|
||||
int ifindex = dev ? dev->ifindex : 1;
|
||||
struct nlmsghdr *nlh;
|
||||
u8 scope = RT_SCOPE_UNIVERSE;
|
||||
struct nlmsghdr *nlh;
|
||||
|
||||
if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
|
||||
scope = RT_SCOPE_SITE;
|
||||
@ -5252,7 +5260,7 @@ static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
|
||||
|
||||
put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
|
||||
if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
|
||||
put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
|
||||
put_cacheinfo(skb, ifaca->aca_cstamp, READ_ONCE(ifaca->aca_tstamp),
|
||||
INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
|
||||
nlmsg_cancel(skb, nlh);
|
||||
return -EMSGSIZE;
|
||||
@ -5263,24 +5271,23 @@ static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
|
||||
}
|
||||
|
||||
/* called with rcu_read_lock() */
|
||||
static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
|
||||
struct netlink_callback *cb, int s_ip_idx,
|
||||
static int in6_dump_addrs(const struct inet6_dev *idev, struct sk_buff *skb,
|
||||
struct netlink_callback *cb, int *s_ip_idx,
|
||||
struct inet6_fill_args *fillargs)
|
||||
{
|
||||
struct ifmcaddr6 *ifmca;
|
||||
struct ifacaddr6 *ifaca;
|
||||
const struct ifmcaddr6 *ifmca;
|
||||
const struct ifacaddr6 *ifaca;
|
||||
int ip_idx = 0;
|
||||
int err = 1;
|
||||
int err = 0;
|
||||
|
||||
read_lock_bh(&idev->lock);
|
||||
switch (fillargs->type) {
|
||||
case UNICAST_ADDR: {
|
||||
struct inet6_ifaddr *ifa;
|
||||
const struct inet6_ifaddr *ifa;
|
||||
fillargs->event = RTM_NEWADDR;
|
||||
|
||||
/* unicast address incl. temp addr */
|
||||
list_for_each_entry(ifa, &idev->addr_list, if_list) {
|
||||
if (ip_idx < s_ip_idx)
|
||||
list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
|
||||
if (ip_idx < *s_ip_idx)
|
||||
goto next;
|
||||
err = inet6_fill_ifaddr(skb, ifa, fillargs);
|
||||
if (err < 0)
|
||||
@ -5292,27 +5299,25 @@ next:
|
||||
break;
|
||||
}
|
||||
case MULTICAST_ADDR:
|
||||
read_unlock_bh(&idev->lock);
|
||||
fillargs->event = RTM_GETMULTICAST;
|
||||
|
||||
/* multicast address */
|
||||
for (ifmca = rcu_dereference(idev->mc_list);
|
||||
ifmca;
|
||||
ifmca = rcu_dereference(ifmca->next), ip_idx++) {
|
||||
if (ip_idx < s_ip_idx)
|
||||
if (ip_idx < *s_ip_idx)
|
||||
continue;
|
||||
err = inet6_fill_ifmcaddr(skb, ifmca, fillargs);
|
||||
if (err < 0)
|
||||
break;
|
||||
}
|
||||
read_lock_bh(&idev->lock);
|
||||
break;
|
||||
case ANYCAST_ADDR:
|
||||
fillargs->event = RTM_GETANYCAST;
|
||||
/* anycast address */
|
||||
for (ifaca = rcu_dereference(idev->ac_list); ifaca;
|
||||
ifaca = rcu_dereference(ifaca->aca_next), ip_idx++) {
|
||||
if (ip_idx < s_ip_idx)
|
||||
if (ip_idx < *s_ip_idx)
|
||||
continue;
|
||||
err = inet6_fill_ifacaddr(skb, ifaca, fillargs);
|
||||
if (err < 0)
|
||||
@ -5322,8 +5327,7 @@ next:
|
||||
default:
|
||||
break;
|
||||
}
|
||||
read_unlock_bh(&idev->lock);
|
||||
cb->args[2] = ip_idx;
|
||||
*s_ip_idx = err ? ip_idx : 0;
|
||||
return err;
|
||||
}
|
||||
|
||||
@ -5386,6 +5390,7 @@ static int inet6_valid_dump_ifaddr_req(const struct nlmsghdr *nlh,
|
||||
static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
|
||||
enum addr_type_t type)
|
||||
{
|
||||
struct net *tgt_net = sock_net(skb->sk);
|
||||
const struct nlmsghdr *nlh = cb->nlh;
|
||||
struct inet6_fill_args fillargs = {
|
||||
.portid = NETLINK_CB(cb->skb).portid,
|
||||
@ -5394,72 +5399,52 @@ static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
|
||||
.netnsid = -1,
|
||||
.type = type,
|
||||
};
|
||||
struct net *tgt_net = sock_net(skb->sk);
|
||||
int idx, s_idx, s_ip_idx;
|
||||
int h, s_h;
|
||||
struct {
|
||||
unsigned long ifindex;
|
||||
int ip_idx;
|
||||
} *ctx = (void *)cb->ctx;
|
||||
struct net_device *dev;
|
||||
struct inet6_dev *idev;
|
||||
struct hlist_head *head;
|
||||
int err = 0;
|
||||
|
||||
s_h = cb->args[0];
|
||||
s_idx = idx = cb->args[1];
|
||||
s_ip_idx = cb->args[2];
|
||||
|
||||
rcu_read_lock();
|
||||
if (cb->strict_check) {
|
||||
err = inet6_valid_dump_ifaddr_req(nlh, &fillargs, &tgt_net,
|
||||
skb->sk, cb);
|
||||
if (err < 0)
|
||||
goto put_tgt_net;
|
||||
goto done;
|
||||
|
||||
err = 0;
|
||||
if (fillargs.ifindex) {
|
||||
dev = __dev_get_by_index(tgt_net, fillargs.ifindex);
|
||||
if (!dev) {
|
||||
err = -ENODEV;
|
||||
goto put_tgt_net;
|
||||
}
|
||||
err = -ENODEV;
|
||||
dev = dev_get_by_index_rcu(tgt_net, fillargs.ifindex);
|
||||
if (!dev)
|
||||
goto done;
|
||||
idev = __in6_dev_get(dev);
|
||||
if (idev) {
|
||||
err = in6_dump_addrs(idev, skb, cb, s_ip_idx,
|
||||
if (idev)
|
||||
err = in6_dump_addrs(idev, skb, cb,
|
||||
&ctx->ip_idx,
|
||||
&fillargs);
|
||||
if (err > 0)
|
||||
err = 0;
|
||||
}
|
||||
goto put_tgt_net;
|
||||
goto done;
|
||||
}
|
||||
}
|
||||
|
||||
cb->seq = inet6_base_seq(tgt_net);
|
||||
for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
|
||||
idx = 0;
|
||||
head = &tgt_net->dev_index_head[h];
|
||||
hlist_for_each_entry_rcu(dev, head, index_hlist) {
|
||||
if (idx < s_idx)
|
||||
goto cont;
|
||||
if (h > s_h || idx > s_idx)
|
||||
s_ip_idx = 0;
|
||||
idev = __in6_dev_get(dev);
|
||||
if (!idev)
|
||||
goto cont;
|
||||
|
||||
if (in6_dump_addrs(idev, skb, cb, s_ip_idx,
|
||||
&fillargs) < 0)
|
||||
goto done;
|
||||
cont:
|
||||
idx++;
|
||||
}
|
||||
for_each_netdev_dump(tgt_net, dev, ctx->ifindex) {
|
||||
idev = __in6_dev_get(dev);
|
||||
if (!idev)
|
||||
continue;
|
||||
err = in6_dump_addrs(idev, skb, cb, &ctx->ip_idx,
|
||||
&fillargs);
|
||||
if (err < 0)
|
||||
goto done;
|
||||
}
|
||||
done:
|
||||
cb->args[0] = h;
|
||||
cb->args[1] = idx;
|
||||
put_tgt_net:
|
||||
rcu_read_unlock();
|
||||
if (fillargs.netnsid >= 0)
|
||||
put_net(tgt_net);
|
||||
|
||||
return skb->len ? : err;
|
||||
return err;
|
||||
}
|
||||
|
||||
static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
|
||||
@ -7469,15 +7454,18 @@ int __init addrconf_init(void)
|
||||
goto errout;
|
||||
err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETADDR,
|
||||
inet6_rtm_getaddr, inet6_dump_ifaddr,
|
||||
RTNL_FLAG_DOIT_UNLOCKED);
|
||||
RTNL_FLAG_DOIT_UNLOCKED |
|
||||
RTNL_FLAG_DUMP_UNLOCKED);
|
||||
if (err < 0)
|
||||
goto errout;
|
||||
err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETMULTICAST,
|
||||
NULL, inet6_dump_ifmcaddr, 0);
|
||||
NULL, inet6_dump_ifmcaddr,
|
||||
RTNL_FLAG_DUMP_UNLOCKED);
|
||||
if (err < 0)
|
||||
goto errout;
|
||||
err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETANYCAST,
|
||||
NULL, inet6_dump_ifacaddr, 0);
|
||||
NULL, inet6_dump_ifacaddr,
|
||||
RTNL_FLAG_DUMP_UNLOCKED);
|
||||
if (err < 0)
|
||||
goto errout;
|
||||
err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETNETCONF,
|
||||
|
||||
Loading…
Reference in New Issue
Block a user