diff options
Diffstat (limited to 'sys/netinet/tcp_input.c')
| -rw-r--r-- | sys/netinet/tcp_input.c | 19 |
1 files changed, 11 insertions, 8 deletions
diff --git a/sys/netinet/tcp_input.c b/sys/netinet/tcp_input.c index 1a31c5e..7c8310f 100644 --- a/sys/netinet/tcp_input.c +++ b/sys/netinet/tcp_input.c @@ -3288,22 +3288,19 @@ tcp_xmit_timer(struct tcpcb *tp, int rtt) * are present. Store the upper limit of the length of options plus * data in maxopd. * - * In case of T/TCP, we call this routine during implicit connection - * setup as well (offer = -1), to initialize maxseg from the cached - * MSS of our peer. - * * NOTE that this routine is only called when we process an incoming - * segment. Outgoing SYN/ACK MSS settings are handled in tcp_mssopt(). + * segment, or an ICMP need fragmentation datagram. Outgoing SYN/ACK MSS + * settings are handled in tcp_mssopt(). */ void -tcp_mss_update(struct tcpcb *tp, int offer, +tcp_mss_update(struct tcpcb *tp, int offer, int mtuoffer, struct hc_metrics_lite *metricptr, int *mtuflags) { int mss = 0; u_long maxmtu = 0; struct inpcb *inp = tp->t_inpcb; struct hc_metrics_lite metrics; - int origoffer = offer; + int origoffer; #ifdef INET6 int isipv6 = ((inp->inp_vflag & INP_IPV6) != 0) ? 1 : 0; size_t min_protoh = isipv6 ? @@ -3315,6 +3312,12 @@ tcp_mss_update(struct tcpcb *tp, int offer, INP_WLOCK_ASSERT(tp->t_inpcb); + if (mtuoffer != -1) { + KASSERT(offer == -1, ("%s: conflict", __func__)); + offer = mtuoffer - min_protoh; + } + origoffer = offer; + /* Initialize. */ #ifdef INET6 if (isipv6) { @@ -3473,7 +3476,7 @@ tcp_mss(struct tcpcb *tp, int offer) KASSERT(tp != NULL, ("%s: tp == NULL", __func__)); - tcp_mss_update(tp, offer, &metrics, &mtuflags); + tcp_mss_update(tp, offer, -1, &metrics, &mtuflags); mss = tp->t_maxseg; inp = tp->t_inpcb; |
