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-rw-r--r--include/net/inet_connection_sock.h3
-rw-r--r--net/ipv4/inet_connection_sock.c33
2 files changed, 36 insertions, 0 deletions
diff --git a/include/net/inet_connection_sock.h b/include/net/inet_connection_sock.h
index 6ac4e3b5007f..4367d913c0e2 100644
--- a/include/net/inet_connection_sock.h
+++ b/include/net/inet_connection_sock.h
@@ -250,6 +250,9 @@ extern int inet_csk_get_port(struct sock *sk, unsigned short snum);
extern struct dst_entry* inet_csk_route_req(struct sock *sk,
const struct request_sock *req);
+extern struct dst_entry* inet_csk_route_child_sock(struct sock *sk,
+ struct sock *newsk,
+ const struct request_sock *req);
static inline void inet_csk_reqsk_queue_add(struct sock *sk,
struct request_sock *req,
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)
{