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authorVlad Yasevich <vladislav.yasevich@hp.com>2009-09-05 02:21:00 +0400
committerVlad Yasevich <vladislav.yasevich@hp.com>2009-09-05 02:21:00 +0400
commitf68b2e05f326971cd76c65aa91a1a41771dd7485 (patch)
tree2940d83f3787570cc030791378ee23b89b941662 /include
parentcb95ea32a457871f72752164de8d94fa20f4703c (diff)
downloadlinux-f68b2e05f326971cd76c65aa91a1a41771dd7485.tar.xz
sctp: Fix SCTP_MAXSEG socket option to comply to spec.
We had a bug that we never stored the user-defined value for MAXSEG when setting the value on an association. Thus future PMTU events ended up re-writing the frag point and increasing it past user limit. Additionally, when setting the option on the socket/endpoint, we effect all current associations, which is against spec. Now, we store the user 'maxseg' value along with the computed 'frag_point'. We inherit 'maxseg' from the socket at association creation and use it as an upper limit for 'frag_point' when its set. Signed-off-by: Vlad Yasevich <vladislav.yasevich@hp.com>
Diffstat (limited to 'include')
-rw-r--r--include/net/sctp/sctp.h7
-rw-r--r--include/net/sctp/structs.h1
2 files changed, 5 insertions, 3 deletions
diff --git a/include/net/sctp/sctp.h b/include/net/sctp/sctp.h
index d16a304cbed4..8a6d5297de16 100644
--- a/include/net/sctp/sctp.h
+++ b/include/net/sctp/sctp.h
@@ -486,15 +486,16 @@ static inline __s32 sctp_jitter(__u32 rto)
}
/* Break down data chunks at this point. */
-static inline int sctp_frag_point(const struct sctp_sock *sp, int pmtu)
+static inline int sctp_frag_point(const struct sctp_association *asoc, int pmtu)
{
+ struct sctp_sock *sp = sctp_sk(asoc->base.sk);
int frag = pmtu;
frag -= sp->pf->af->net_header_len;
frag -= sizeof(struct sctphdr) + sizeof(struct sctp_data_chunk);
- if (sp->user_frag)
- frag = min_t(int, frag, sp->user_frag);
+ if (asoc->user_frag)
+ frag = min_t(int, frag, asoc->user_frag);
frag = min_t(int, frag, SCTP_MAX_CHUNK_LEN);
diff --git a/include/net/sctp/structs.h b/include/net/sctp/structs.h
index df4c6321996d..b10612810f56 100644
--- a/include/net/sctp/structs.h
+++ b/include/net/sctp/structs.h
@@ -1763,6 +1763,7 @@ struct sctp_association {
/* The message size at which SCTP fragmentation will occur. */
__u32 frag_point;
+ __u32 user_frag;
/* Counter used to count INIT errors. */
int init_err_counter;