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ipv4: Use newinet->inet_opt in inet_csk_route_child_sock()

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Since 0e73441992 ("ipv4: Use inet_csk_route_child_sock() in DCCP and
TCP."), inet_csk_route_child_sock() is called instead of
inet_csk_route_req().

However, after creating the child-sock in tcp/dccp_v4_syn_recv_sock(),
ireq->opt is set to NULL, before calling inet_csk_route_child_sock().
Thus, inside inet_csk_route_child_sock() opt is always NULL and the
SRR-options are not respected anymore.
Packets sent by the server won't have the correct destination-IP.

This patch fixes it by accessing newinet->inet_opt instead of ireq->opt
inside inet_csk_route_child_sock().

Reported-by: Luca Boccassi <luca.boccassi@gmail.com>
Signed-off-by: Christoph Paasch <christoph.paasch@uclouvain.be>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Christoph Paasch 2012-08-20 02:52:09 +00:00 committed by David S. Miller
parent 144d56e910
commit 1a7b27c97c
1 changed files with 6 additions and 1 deletions
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7
net/ipv4/inet_connection_sock.c
View File

@ -404,12 +404,15 @@ struct dst_entry *inet_csk_route_child_sock(struct sock *sk,
{
const struct inet_request_sock *ireq = inet_rsk(req);
struct inet_sock *newinet = inet_sk(newsk);
struct ip_options_rcu *opt = ireq->opt;
struct ip_options_rcu *opt;
struct net *net = sock_net(sk);
struct flowi4 *fl4;
struct rtable *rt;
fl4 = &newinet->cork.fl.u.ip4;
rcu_read_lock();
opt = rcu_dereference(newinet->inet_opt);
flowi4_init_output(fl4, sk->sk_bound_dev_if, sk->sk_mark,
RT_CONN_FLAGS(sk), RT_SCOPE_UNIVERSE,
sk->sk_protocol, inet_sk_flowi_flags(sk),
@ -421,11 +424,13 @@ struct dst_entry *inet_csk_route_child_sock(struct sock *sk,
goto no_route;
if (opt && opt->opt.is_strictroute && rt->rt_gateway)
goto route_err;
rcu_read_unlock();
return &rt->dst;
route_err:
ip_rt_put(rt);
no_route:
rcu_read_unlock();
IP_INC_STATS_BH(net, IPSTATS_MIB_OUTNOROUTES);
return NULL;
}