Skip to content

Commit

Permalink
sctp: check cached dst before using it
Browse files Browse the repository at this point in the history
dst_check() will take care of SA (and obsolete field), hence
IPsec rekeying scenario is taken into account.

Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Acked-by: Vlad Yaseivch <vyasevich@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
  • Loading branch information
Nicolas Dichtel authored and David S. Miller committed May 11, 2012
1 parent c57b546 commit e026886
Show file tree
Hide file tree
Showing 3 changed files with 14 additions and 20 deletions.
13 changes: 13 additions & 0 deletions include/net/sctp/sctp.h
Original file line number Diff line number Diff line change
Expand Up @@ -704,4 +704,17 @@ static inline void sctp_v4_map_v6(union sctp_addr *addr)
addr->v6.sin6_addr.s6_addr32[2] = htonl(0x0000ffff);
}

/* The cookie is always 0 since this is how it's used in the
* pmtu code.
*/
static inline struct dst_entry *sctp_transport_dst_check(struct sctp_transport *t)
{
if (t->dst && !dst_check(t->dst, 0)) {
dst_release(t->dst);
t->dst = NULL;
}

return t->dst;
}

#endif /* __net_sctp_h__ */
4 changes: 1 addition & 3 deletions net/sctp/output.c
Original file line number Diff line number Diff line change
Expand Up @@ -377,9 +377,7 @@ int sctp_packet_transmit(struct sctp_packet *packet)
*/
skb_set_owner_w(nskb, sk);

/* The 'obsolete' field of dst is set to 2 when a dst is freed. */
if (!dst || (dst->obsolete > 1)) {
dst_release(dst);
if (!sctp_transport_dst_check(tp)) {
sctp_transport_route(tp, NULL, sctp_sk(sk));
if (asoc && (asoc->param_flags & SPP_PMTUD_ENABLE)) {
sctp_assoc_sync_pmtu(asoc);
Expand Down
17 changes: 0 additions & 17 deletions net/sctp/transport.c
Original file line number Diff line number Diff line change
Expand Up @@ -226,23 +226,6 @@ void sctp_transport_pmtu(struct sctp_transport *transport, struct sock *sk)
transport->pathmtu = SCTP_DEFAULT_MAXSEGMENT;
}

/* this is a complete rip-off from __sk_dst_check
* the cookie is always 0 since this is how it's used in the
* pmtu code
*/
static struct dst_entry *sctp_transport_dst_check(struct sctp_transport *t)
{
struct dst_entry *dst = t->dst;

if (dst && dst->obsolete && dst->ops->check(dst, 0) == NULL) {
dst_release(t->dst);
t->dst = NULL;
return NULL;
}

return dst;
}

void sctp_transport_update_pmtu(struct sctp_transport *t, u32 pmtu)
{
struct dst_entry *dst;
Expand Down

0 comments on commit e026886

Please sign in to comment.