Set the MTU of an path to an approriate value if the interface MTU
can't be determined. MFC after: 3 days.
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parent
1249ba5fc6
commit
a62e467ac3
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=227540
@ -4064,13 +4064,8 @@ sctp_add_remote_addr(struct sctp_tcb *stcb, struct sockaddr *newaddr,
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/* Now get the interface MTU */
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if (net->ro._s_addr && net->ro._s_addr->ifn_p) {
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net->mtu = SCTP_GATHER_MTU_FROM_INTFC(net->ro._s_addr->ifn_p);
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} else {
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net->mtu = 0;
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}
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if (net->mtu == 0) {
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/* Huh ?? */
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net->mtu = SCTP_DEFAULT_MTU;
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} else {
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if (net->mtu > 0) {
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uint32_t rmtu;
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rmtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, net->ro.ro_rt);
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@ -4090,11 +4085,31 @@ sctp_add_remote_addr(struct sctp_tcb *stcb, struct sockaddr *newaddr,
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net->mtu = rmtu;
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}
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}
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if (from == SCTP_ALLOC_ASOC) {
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stcb->asoc.smallest_mtu = net->mtu;
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}
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if (net->mtu == 0) {
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switch (newaddr->sa_family) {
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#ifdef INET
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case AF_INET:
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net->mtu = SCTP_DEFAULT_MTU;
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break;
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#endif
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#ifdef INET6
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case AF_INET6:
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net->mtu = 1280;
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break;
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#endif
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default:
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break;
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}
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} else {
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net->mtu = stcb->asoc.smallest_mtu;
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}
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if (net->port) {
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net->mtu -= (uint32_t) sizeof(struct udphdr);
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}
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if (from == SCTP_ALLOC_ASOC) {
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stcb->asoc.smallest_mtu = net->mtu;
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}
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if (stcb->asoc.smallest_mtu > net->mtu) {
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stcb->asoc.smallest_mtu = net->mtu;
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}
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#ifdef INET6
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if (newaddr->sa_family == AF_INET6) {
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@ -4104,12 +4119,7 @@ sctp_add_remote_addr(struct sctp_tcb *stcb, struct sockaddr *newaddr,
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(void)sa6_recoverscope(sin6);
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}
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#endif
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if (net->port) {
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net->mtu -= sizeof(struct udphdr);
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}
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if (stcb->asoc.smallest_mtu > net->mtu) {
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stcb->asoc.smallest_mtu = net->mtu;
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}
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/* JRS - Use the congestion control given in the CC module */
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if (stcb->asoc.cc_functions.sctp_set_initial_cc_param != NULL)
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(*stcb->asoc.cc_functions.sctp_set_initial_cc_param) (stcb, net);
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