sctp: Inherit all socket options from parent correctly.

During peeloff/accept() sctp needs to save the parent socket state
into the new socket so that any options set on the parent are
inherited by the child socket.  This was found when the
parent/listener socket issues SO_BINDTODEVICE, but the
data was misrouted after a route cache flush.

Signed-off-by: Vlad Yasevich <vladislav.yasevich@hp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 2 insertions, 27 deletions

diff --git a/net/sctp/protocol.c b/net/sctp/protocol.c
index cc0b592698f9..c1e316ee7155 100644
--- a/net/sctp/protocol.c
+++ b/net/sctp/protocol.c
@@ -589,46 +589,21 @@ static int sctp_v4_is_ce(const struct sk_buff *skb)
 static struct sock *sctp_v4_create_accept_sk(struct sock *sk,
                                              struct sctp_association *asoc)
 {
-        struct inet_sock *inet = inet_sk(sk);
-        struct inet_sock *newinet;
         struct sock *newsk = sk_alloc(sock_net(sk), PF_INET, GFP_KERNEL,
                         sk->sk_prot);
+        struct inet_sock *newinet;
 
         if (!newsk)
                 goto out;
 
         sock_init_data(NULL, newsk);
 
-        newsk->sk_type = SOCK_STREAM;
-
-        newsk->sk_no_check = sk->sk_no_check;
-        newsk->sk_reuse = sk->sk_reuse;
-        newsk->sk_shutdown = sk->sk_shutdown;
-
-        newsk->sk_destruct = inet_sock_destruct;
-        newsk->sk_family = PF_INET;
-        newsk->sk_protocol = IPPROTO_SCTP;
-        newsk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
+        sctp_copy_sock(newsk, sk, asoc);
         sock_reset_flag(newsk, SOCK_ZAPPED);
 
         newinet = inet_sk(newsk);
 
-        /* Initialize sk's sport, dport, rcv_saddr and daddr for
-         * getsockname() and getpeername()
-         */
-        newinet->sport = inet->sport;
-        newinet->saddr = inet->saddr;
-        newinet->rcv_saddr = inet->rcv_saddr;
-        newinet->dport = htons(asoc->peer.port);
         newinet->daddr = asoc->peer.primary_addr.v4.sin_addr.s_addr;
-        newinet->pmtudisc = inet->pmtudisc;
-        newinet->id = asoc->next_tsn ^ jiffies;
-
-        newinet->uc_ttl = -1;
-        newinet->mc_loop = 1;
-        newinet->mc_ttl = 1;
-        newinet->mc_index = 0;
-        newinet->mc_list = NULL;
 
         sk_refcnt_debug_inc(newsk);