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authorDavid S. Miller <davem@davemloft.net>2011-05-09 01:34:22 +0400
committerDavid S. Miller <davem@davemloft.net>2011-05-09 01:34:22 +0400
commit77357a95522ba645bbfd65253b34317c824103f9 (patch)
tree63eb29d2efad915add7693445a215eef890c4191 /net/ipv4/inet_connection_sock.c
parent8663c938ceb72f47941c95ff0ea491ebbdd68f26 (diff)
downloadlinux-77357a95522ba645bbfd65253b34317c824103f9.tar.xz
ipv4: Create inet_csk_route_child_sock().
This is just like inet_csk_route_req() except that it operates after we've created the new child socket. In this way we can use the new socket's cork flow for proper route key storage. This will be used by DCCP and TCP child socket creation handling. Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/inet_connection_sock.c')
-rw-r--r--net/ipv4/inet_connection_sock.c33
1 files changed, 33 insertions, 0 deletions
diff --git a/net/ipv4/inet_connection_sock.c b/net/ipv4/inet_connection_sock.c
index 54944da2f794..3a2ba5632dff 100644
--- a/net/ipv4/inet_connection_sock.c
+++ b/net/ipv4/inet_connection_sock.c
@@ -379,6 +379,39 @@ no_route:
}
EXPORT_SYMBOL_GPL(inet_csk_route_req);
+struct dst_entry *inet_csk_route_child_sock(struct sock *sk,
+ struct sock *newsk,
+ const struct request_sock *req)
+{
+ const struct inet_request_sock *ireq = inet_rsk(req);
+ struct inet_sock *newinet = inet_sk(newsk);
+ struct ip_options_rcu *opt = ireq->opt;
+ struct net *net = sock_net(sk);
+ struct flowi4 *fl4;
+ struct rtable *rt;
+
+ fl4 = &newinet->cork.fl.u.ip4;
+ 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),
+ (opt && opt->opt.srr) ? opt->opt.faddr : ireq->rmt_addr,
+ ireq->loc_addr, ireq->rmt_port, inet_sk(sk)->inet_sport);
+ security_req_classify_flow(req, flowi4_to_flowi(fl4));
+ rt = ip_route_output_flow(net, fl4, sk);
+ if (IS_ERR(rt))
+ goto no_route;
+ if (opt && opt->opt.is_strictroute && fl4->daddr != rt->rt_gateway)
+ goto route_err;
+ return &rt->dst;
+
+route_err:
+ ip_rt_put(rt);
+no_route:
+ IP_INC_STATS_BH(net, IPSTATS_MIB_OUTNOROUTES);
+ return NULL;
+}
+EXPORT_SYMBOL_GPL(inet_csk_route_child_sock);
+
static inline u32 inet_synq_hash(const __be32 raddr, const __be16 rport,
const u32 rnd, const u32 synq_hsize)
{