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| author | Nicolas Dichtel <nicolas.dichtel@6wind.com> | 2012-05-04 05:24:54 +0000 |
|---|---|---|
| committer | Ben Hutchings <ben@decadent.org.uk> | 2012-06-10 14:42:06 +0100 |
| commit | ba9ee5eb730f20bab874ba91d3dfec7816459dad (patch) | |
| tree | 0c757c9ddb80d61efea1432d8f0cd7d1448f2410 | |
| parent | 0fc2cf738f345db9798e546a70810c5984aed214 (diff) | |
| download | lwn-ba9ee5eb730f20bab874ba91d3dfec7816459dad.tar.gz lwn-ba9ee5eb730f20bab874ba91d3dfec7816459dad.zip | |
sctp: check cached dst before using it
[ Upstream commit e0268868ba064980488fc8c194db3d8e9fb2959c ]
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>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
| -rw-r--r-- | include/net/sctp/sctp.h | 13 | ||||
| -rw-r--r-- | net/sctp/output.c | 4 | ||||
| -rw-r--r-- | net/sctp/transport.c | 17 |
3 files changed, 14 insertions, 20 deletions
diff --git a/include/net/sctp/sctp.h b/include/net/sctp/sctp.h index 6a72a58cde59..ad0398815045 100644 --- a/include/net/sctp/sctp.h +++ b/include/net/sctp/sctp.h @@ -703,4 +703,17 @@ 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__ */ diff --git a/net/sctp/output.c b/net/sctp/output.c index 817174eb5f41..8fc4dcd294ab 100644 --- a/net/sctp/output.c +++ b/net/sctp/output.c @@ -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); diff --git a/net/sctp/transport.c b/net/sctp/transport.c index 394c57ca2f54..8da4481ed30a 100644 --- a/net/sctp/transport.c +++ b/net/sctp/transport.c @@ -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; |