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Report the MTU consistently as specified in

Browse Source 
https://tools.ietf.org/html/rfc6458
Thanks to Irene Ruengeler for helping me to fix this bug.
MFC after: 3 days
This commit is contained in:
Michael Tuexen 2015-05-28 20:33:28 +00:00
parent 0818979a3c
commit c913390df3
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=283666
1 changed files with 74 additions and 25 deletions
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99
sys/netinet/sctp_usrreq.c
View File

@ -2439,17 +2439,23 @@ sctp_getopt(struct socket *so, int optname, void *optval, size_t *optsize,
/* Applies to the specific association */
paddrp->spp_flags = 0;
if (net != NULL) {
int ovh;
if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
ovh = SCTP_MED_OVERHEAD;
} else {
ovh = SCTP_MED_V4_OVERHEAD;
}
paddrp->spp_hbinterval = net->heart_beat_delay;
paddrp->spp_pathmaxrxt = net->failure_threshold;
paddrp->spp_pathmtu = net->mtu - ovh;
paddrp->spp_pathmtu = net->mtu;
switch (net->ro._l_addr.sa.sa_family) {
#ifdef INET
case AF_INET:
paddrp->spp_pathmtu -= SCTP_MIN_V4_OVERHEAD;
break;
#endif
#ifdef INET6
case AF_INET6:
paddrp->spp_pathmtu -= SCTP_MIN_V4_OVERHEAD;
break;
#endif
default:
break;
}
/* get flags for HB */
if (net->dest_state & SCTP_ADDR_NOHB) {
paddrp->spp_flags |= SPP_HB_DISABLE;
@ -2479,7 +2485,7 @@ sctp_getopt(struct socket *so, int optname, void *optval, size_t *optsize,
* value
*/
paddrp->spp_pathmaxrxt = stcb->asoc.def_net_failure;
paddrp->spp_pathmtu = sctp_get_frag_point(stcb, &stcb->asoc);
paddrp->spp_pathmtu = 0;
if (stcb->asoc.default_dscp & 0x01) {
paddrp->spp_dscp = stcb->asoc.default_dscp & 0xfc;
paddrp->spp_flags |= SPP_DSCP;
@ -2615,6 +2621,20 @@ sctp_getopt(struct socket *so, int optname, void *optval, size_t *optsize,
paddri->spinfo_rto = net->RTO;
paddri->spinfo_assoc_id = sctp_get_associd(stcb);
paddri->spinfo_mtu = net->mtu;
switch (addr->sa_family) {
#if defined(INET)
case AF_INET:
paddri->spinfo_mtu -= SCTP_MIN_V4_OVERHEAD;
break;
#endif
#if defined(INET6)
case AF_INET6:
paddri->spinfo_mtu -= SCTP_MIN_OVERHEAD;
break;
#endif
default:
break;
}
SCTP_TCB_UNLOCK(stcb);
*optsize = sizeof(struct sctp_paddrinfo);
} else {
@ -2691,6 +2711,20 @@ sctp_getopt(struct socket *so, int optname, void *optval, size_t *optsize,
sstat->sstat_primary.spinfo_srtt = net->lastsa >> SCTP_RTT_SHIFT;
sstat->sstat_primary.spinfo_rto = net->RTO;
sstat->sstat_primary.spinfo_mtu = net->mtu;
switch (stcb->asoc.primary_destination->ro._l_addr.sa.sa_family) {
#if defined(INET)
case AF_INET:
sstat->sstat_primary.spinfo_mtu -= SCTP_MIN_V4_OVERHEAD;
break;
#endif
#if defined(INET6)
case AF_INET6:
sstat->sstat_primary.spinfo_mtu -= SCTP_MIN_OVERHEAD;
break;
#endif
default:
break;
}
sstat->sstat_primary.spinfo_assoc_id = sctp_get_associd(stcb);
SCTP_TCB_UNLOCK(stcb);
*optsize = sizeof(struct sctp_status);
@ -5188,19 +5222,6 @@ sctp_setopt(struct socket *so, int optname, void *optval, size_t optsize,
}
if (stcb != NULL) {
/************************TCB SPECIFIC SET ******************/
/*
* do we change the timer for HB, we run
* only one?
*/
int ovh = 0;
if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
ovh = SCTP_MED_OVERHEAD;
} else {
ovh = SCTP_MED_V4_OVERHEAD;
}
/* network sets ? */
if (net != NULL) {
/************************NET SPECIFIC SET ******************/
if (paddrp->spp_flags & SPP_HB_DISABLE) {
@ -5234,7 +5255,21 @@ sctp_setopt(struct socket *so, int optname, void *optval, size_t optsize,
SCTP_FROM_SCTP_USRREQ + SCTP_LOC_11);
}
net->dest_state |= SCTP_ADDR_NO_PMTUD;
net->mtu = paddrp->spp_pathmtu + ovh;
net->mtu = paddrp->spp_pathmtu;
switch (net->ro._l_addr.sa.sa_family) {
#ifdef INET
case AF_INET:
net->mtu += SCTP_MIN_V4_OVERHEAD;
break;
#endif
#ifdef INET6
case AF_INET6:
net->mtu += SCTP_MIN_OVERHEAD;
break;
#endif
default:
break;
}
if (net->mtu < stcb->asoc.smallest_mtu) {
sctp_pathmtu_adjustment(stcb, net->mtu);
}
@ -5362,7 +5397,21 @@ sctp_setopt(struct socket *so, int optname, void *optval, size_t optsize,
SCTP_FROM_SCTP_USRREQ + SCTP_LOC_16);
}
net->dest_state |= SCTP_ADDR_NO_PMTUD;
net->mtu = paddrp->spp_pathmtu + ovh;
net->mtu = paddrp->spp_pathmtu;
switch (net->ro._l_addr.sa.sa_family) {
#ifdef INET
case AF_INET:
net->mtu += SCTP_MIN_V4_OVERHEAD;
break;
#endif
#ifdef INET6
case AF_INET6:
net->mtu += SCTP_MIN_OVERHEAD;
break;
#endif
default:
break;
}
if (net->mtu < stcb->asoc.smallest_mtu) {
sctp_pathmtu_adjustment(stcb, net->mtu);
}