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Set the MTU of an path to an approriate value if the interface MTU

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can't be determined.

MFC after: 3 days.
This commit is contained in:
Michael Tuexen 2011-11-15 20:41:50 +00:00
parent 1249ba5fc6
commit a62e467ac3
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=227540
1 changed files with 26 additions and 16 deletions
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42
sys/netinet/sctp_pcb.c
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@ -4064,13 +4064,8 @@ sctp_add_remote_addr(struct sctp_tcb *stcb, struct sockaddr *newaddr,
/* Now get the interface MTU */
if (net->ro._s_addr && net->ro._s_addr->ifn_p) {
net->mtu = SCTP_GATHER_MTU_FROM_INTFC(net->ro._s_addr->ifn_p);
} else {
net->mtu = 0;
}
if (net->mtu == 0) {
/* Huh ?? */
net->mtu = SCTP_DEFAULT_MTU;
} else {
if (net->mtu > 0) {
uint32_t rmtu;
rmtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, net->ro.ro_rt);
@ -4090,11 +4085,31 @@ sctp_add_remote_addr(struct sctp_tcb *stcb, struct sockaddr *newaddr,
net->mtu = rmtu;
}
}
if (from == SCTP_ALLOC_ASOC) {
stcb->asoc.smallest_mtu = net->mtu;
}
if (net->mtu == 0) {
switch (newaddr->sa_family) {
#ifdef INET
case AF_INET:
net->mtu = SCTP_DEFAULT_MTU;
break;
#endif
#ifdef INET6
case AF_INET6:
net->mtu = 1280;
break;
#endif
default:
break;
}
} else {
net->mtu = stcb->asoc.smallest_mtu;
}
if (net->port) {
net->mtu -= (uint32_t) sizeof(struct udphdr);
}
if (from == SCTP_ALLOC_ASOC) {
stcb->asoc.smallest_mtu = net->mtu;
}
if (stcb->asoc.smallest_mtu > net->mtu) {
stcb->asoc.smallest_mtu = net->mtu;
}
#ifdef INET6
if (newaddr->sa_family == AF_INET6) {
@ -4104,12 +4119,7 @@ sctp_add_remote_addr(struct sctp_tcb *stcb, struct sockaddr *newaddr,
(void)sa6_recoverscope(sin6);
}
#endif
if (net->port) {
net->mtu -= sizeof(struct udphdr);
}
if (stcb->asoc.smallest_mtu > net->mtu) {
stcb->asoc.smallest_mtu = net->mtu;
}
/* JRS - Use the congestion control given in the CC module */
if (stcb->asoc.cc_functions.sctp_set_initial_cc_param != NULL)
(*stcb->asoc.cc_functions.sctp_set_initial_cc_param) (stcb, net);