forked from mirrors/linux
ipv4: Cache learned redirect information in inetpeer.
Note that we do not generate the redirect netevent any longer, because we don't create a new cached route. Instead, once the new neighbour is bound to the cached route, we emit a neigh update event instead. Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller
parent
2c8cec5c10
commit
f39925dbde
1 changed files with 42 additions and 94 deletions
136
net/ipv4/route.c
136
net/ipv4/route.c
|
|
@ -1294,13 +1294,8 @@ static void rt_del(unsigned hash, struct rtable *rt)
|
|||
void ip_rt_redirect(__be32 old_gw, __be32 daddr, __be32 new_gw,
|
||||
__be32 saddr, struct net_device *dev)
|
||||
{
|
||||
int i, k;
|
||||
struct in_device *in_dev = __in_dev_get_rcu(dev);
|
||||
struct rtable *rth;
|
||||
struct rtable __rcu **rthp;
|
||||
__be32 skeys[2] = { saddr, 0 };
|
||||
int ikeys[2] = { dev->ifindex, 0 };
|
||||
struct netevent_redirect netevent;
|
||||
struct inet_peer *peer;
|
||||
struct net *net;
|
||||
|
||||
if (!in_dev)
|
||||
|
|
@ -1312,9 +1307,6 @@ void ip_rt_redirect(__be32 old_gw, __be32 daddr, __be32 new_gw,
|
|||
ipv4_is_zeronet(new_gw))
|
||||
goto reject_redirect;
|
||||
|
||||
if (!rt_caching(net))
|
||||
goto reject_redirect;
|
||||
|
||||
if (!IN_DEV_SHARED_MEDIA(in_dev)) {
|
||||
if (!inet_addr_onlink(in_dev, new_gw, old_gw))
|
||||
goto reject_redirect;
|
||||
|
|
@ -1325,93 +1317,13 @@ void ip_rt_redirect(__be32 old_gw, __be32 daddr, __be32 new_gw,
|
|||
goto reject_redirect;
|
||||
}
|
||||
|
||||
for (i = 0; i < 2; i++) {
|
||||
for (k = 0; k < 2; k++) {
|
||||
unsigned hash = rt_hash(daddr, skeys[i], ikeys[k],
|
||||
rt_genid(net));
|
||||
peer = inet_getpeer_v4(daddr, 1);
|
||||
if (peer) {
|
||||
peer->redirect_learned.a4 = new_gw;
|
||||
|
||||
rthp = &rt_hash_table[hash].chain;
|
||||
inet_putpeer(peer);
|
||||
|
||||
while ((rth = rcu_dereference(*rthp)) != NULL) {
|
||||
struct rtable *rt;
|
||||
|
||||
if (rth->fl.fl4_dst != daddr ||
|
||||
rth->fl.fl4_src != skeys[i] ||
|
||||
rth->fl.oif != ikeys[k] ||
|
||||
rt_is_input_route(rth) ||
|
||||
rt_is_expired(rth) ||
|
||||
!net_eq(dev_net(rth->dst.dev), net)) {
|
||||
rthp = &rth->dst.rt_next;
|
||||
continue;
|
||||
}
|
||||
|
||||
if (rth->rt_dst != daddr ||
|
||||
rth->rt_src != saddr ||
|
||||
rth->dst.error ||
|
||||
rth->rt_gateway != old_gw ||
|
||||
rth->dst.dev != dev)
|
||||
break;
|
||||
|
||||
dst_hold(&rth->dst);
|
||||
|
||||
rt = dst_alloc(&ipv4_dst_ops);
|
||||
if (rt == NULL) {
|
||||
ip_rt_put(rth);
|
||||
return;
|
||||
}
|
||||
|
||||
/* Copy all the information. */
|
||||
*rt = *rth;
|
||||
rt->dst.__use = 1;
|
||||
atomic_set(&rt->dst.__refcnt, 1);
|
||||
rt->dst.child = NULL;
|
||||
if (rt->dst.dev)
|
||||
dev_hold(rt->dst.dev);
|
||||
rt->dst.obsolete = -1;
|
||||
rt->dst.lastuse = jiffies;
|
||||
rt->dst.path = &rt->dst;
|
||||
rt->dst.neighbour = NULL;
|
||||
rt->dst.hh = NULL;
|
||||
#ifdef CONFIG_XFRM
|
||||
rt->dst.xfrm = NULL;
|
||||
#endif
|
||||
rt->rt_genid = rt_genid(net);
|
||||
rt->rt_flags |= RTCF_REDIRECTED;
|
||||
|
||||
/* Gateway is different ... */
|
||||
rt->rt_gateway = new_gw;
|
||||
|
||||
/* Redirect received -> path was valid */
|
||||
dst_confirm(&rth->dst);
|
||||
|
||||
if (rt->peer)
|
||||
atomic_inc(&rt->peer->refcnt);
|
||||
if (rt->fi)
|
||||
atomic_inc(&rt->fi->fib_clntref);
|
||||
|
||||
if (arp_bind_neighbour(&rt->dst) ||
|
||||
!(rt->dst.neighbour->nud_state &
|
||||
NUD_VALID)) {
|
||||
if (rt->dst.neighbour)
|
||||
neigh_event_send(rt->dst.neighbour, NULL);
|
||||
ip_rt_put(rth);
|
||||
rt_drop(rt);
|
||||
goto do_next;
|
||||
}
|
||||
|
||||
netevent.old = &rth->dst;
|
||||
netevent.new = &rt->dst;
|
||||
call_netevent_notifiers(NETEVENT_REDIRECT,
|
||||
&netevent);
|
||||
|
||||
rt_del(hash, rth);
|
||||
if (!rt_intern_hash(hash, rt, &rt, NULL, rt->fl.oif))
|
||||
ip_rt_put(rt);
|
||||
goto do_next;
|
||||
}
|
||||
do_next:
|
||||
;
|
||||
}
|
||||
atomic_inc(&__rt_peer_genid);
|
||||
}
|
||||
return;
|
||||
|
||||
|
|
@ -1678,6 +1590,31 @@ static void ip_rt_update_pmtu(struct dst_entry *dst, u32 mtu)
|
|||
}
|
||||
}
|
||||
|
||||
static int check_peer_redir(struct dst_entry *dst, struct inet_peer *peer)
|
||||
{
|
||||
struct rtable *rt = (struct rtable *) dst;
|
||||
__be32 orig_gw = rt->rt_gateway;
|
||||
|
||||
dst_confirm(&rt->dst);
|
||||
|
||||
neigh_release(rt->dst.neighbour);
|
||||
rt->dst.neighbour = NULL;
|
||||
|
||||
rt->rt_gateway = peer->redirect_learned.a4;
|
||||
if (arp_bind_neighbour(&rt->dst) ||
|
||||
!(rt->dst.neighbour->nud_state & NUD_VALID)) {
|
||||
if (rt->dst.neighbour)
|
||||
neigh_event_send(rt->dst.neighbour, NULL);
|
||||
rt->rt_gateway = orig_gw;
|
||||
return -EAGAIN;
|
||||
} else {
|
||||
rt->rt_flags |= RTCF_REDIRECTED;
|
||||
call_netevent_notifiers(NETEVENT_NEIGH_UPDATE,
|
||||
rt->dst.neighbour);
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
static struct dst_entry *ipv4_dst_check(struct dst_entry *dst, u32 cookie)
|
||||
{
|
||||
struct rtable *rt = (struct rtable *) dst;
|
||||
|
|
@ -1694,6 +1631,12 @@ static struct dst_entry *ipv4_dst_check(struct dst_entry *dst, u32 cookie)
|
|||
if (peer && peer->pmtu_expires)
|
||||
check_peer_pmtu(dst, peer);
|
||||
|
||||
if (peer && peer->redirect_learned.a4 &&
|
||||
peer->redirect_learned.a4 != rt->rt_gateway) {
|
||||
if (check_peer_redir(dst, peer))
|
||||
return NULL;
|
||||
}
|
||||
|
||||
rt->rt_peer_genid = rt_peer_genid();
|
||||
}
|
||||
return dst;
|
||||
|
|
@ -1830,6 +1773,11 @@ static void rt_init_metrics(struct rtable *rt, struct fib_info *fi)
|
|||
|
||||
if (peer->pmtu_expires)
|
||||
check_peer_pmtu(&rt->dst, peer);
|
||||
if (peer->redirect_learned.a4 &&
|
||||
peer->redirect_learned.a4 != rt->rt_gateway) {
|
||||
rt->rt_gateway = peer->redirect_learned.a4;
|
||||
rt->rt_flags |= RTCF_REDIRECTED;
|
||||
}
|
||||
} else {
|
||||
if (fi->fib_metrics != (u32 *) dst_default_metrics) {
|
||||
rt->fi = fi;
|
||||
|
|
|
|||
Loading…
Reference in a new issue