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sctp: Fix SCTP_MAXSEG socket option to comply to spec.

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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>
This commit is contained in:
Vlad Yasevich 2009-09-04 18:21:00 -04:00
parent cb95ea32a4
commit f68b2e05f3
4 changed files with 11 additions and 14 deletions
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7
include/net/sctp/sctp.h
View file

@ -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);

1
include/net/sctp/structs.h
View file

@ -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;

6
net/sctp/associola.c
View file

@ -112,6 +112,7 @@ static struct sctp_association *sctp_association_init(struct sctp_association *a
asoc->cookie_life.tv_usec = (sp->assocparams.sasoc_cookie_life % 1000)
* 1000;
asoc->frag_point = 0;
asoc->user_frag = sp->user_frag;
/* Set the association max_retrans and RTO values from the
* socket values.
@ -674,7 +675,7 @@ struct sctp_transport *sctp_assoc_add_peer(struct sctp_association *asoc,
"%d\n", asoc, asoc->pathmtu);
peer->pmtu_pending = 0;
asoc->frag_point = sctp_frag_point(sp, asoc->pathmtu);
asoc->frag_point = sctp_frag_point(asoc, asoc->pathmtu);
/* The asoc->peer.port might not be meaningful yet, but
* initialize the packet structure anyway.
@ -1330,9 +1331,8 @@ void sctp_assoc_sync_pmtu(struct sctp_association *asoc)
}
if (pmtu) {
struct sctp_sock *sp = sctp_sk(asoc->base.sk);
asoc->pathmtu = pmtu;
asoc->frag_point = sctp_frag_point(sp, pmtu);
asoc->frag_point = sctp_frag_point(asoc, pmtu);
}
SCTP_DEBUG_PRINTK("%s: asoc:%p, pmtu:%d, frag_point:%d\n",

11
net/sctp/socket.c
View file

@ -2243,7 +2243,7 @@ static int sctp_apply_peer_addr_params(struct sctp_paddrparams *params,
sctp_assoc_sync_pmtu(asoc);
} else if (asoc) {
asoc->pathmtu = params->spp_pathmtu;
sctp_frag_point(sp, params->spp_pathmtu);
sctp_frag_point(asoc, params->spp_pathmtu);
} else {
sp->pathmtu = params->spp_pathmtu;
}
@ -2880,15 +2880,10 @@ static int sctp_setsockopt_maxseg(struct sock *sk, char __user *optval, int optl
val -= sizeof(struct sctphdr) +
sizeof(struct sctp_data_chunk);
}
asoc->frag_point = val;
asoc->user_frag = val;
asoc->frag_point = sctp_frag_point(asoc, asoc->pathmtu);
} else {
sp->user_frag = val;
/* Update the frag_point of the existing associations. */
list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
asoc->frag_point = sctp_frag_point(sp, asoc->pathmtu);
}
}
return 0;