提交 f39925db 编写于 作者: D David S. Miller

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: NDavid S. Miller <davem@davemloft.net>
上级 2c8cec5c
......@@ -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));
rthp = &rt_hash_table[hash].chain;
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;
}
peer = inet_getpeer_v4(daddr, 1);
if (peer) {
peer->redirect_learned.a4 = new_gw;
netevent.old = &rth->dst;
netevent.new = &rt->dst;
call_netevent_notifiers(NETEVENT_REDIRECT,
&netevent);
inet_putpeer(peer);
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;
......
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