diff options
author | silby <silby@FreeBSD.org> | 2002-06-14 03:08:05 +0000 |
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committer | silby <silby@FreeBSD.org> | 2002-06-14 03:08:05 +0000 |
commit | 86950bb1f4b520cb14150be632a047ba2d686a46 (patch) | |
tree | a4075c16821c9689076b925a0c7b200573f3ca7d /sys/netinet/tcp_syncache.c | |
parent | 0bbc7c9dc50832c581f689991f9b7d5fa84ba9f9 (diff) | |
download | FreeBSD-src-86950bb1f4b520cb14150be632a047ba2d686a46.zip FreeBSD-src-86950bb1f4b520cb14150be632a047ba2d686a46.tar.gz |
Re-commit w/fix:
Ensure that the syn cache's syn-ack packets contain the same
ip_tos, ip_ttl, and DF bits as all other tcp packets.
PR: 39141
MFC after: 2 weeks
This time, make sure that ipv4 specific code (aka all of the above)
is only run in the ipv4 case.
Diffstat (limited to 'sys/netinet/tcp_syncache.c')
-rw-r--r-- | sys/netinet/tcp_syncache.c | 18 |
1 files changed, 16 insertions, 2 deletions
diff --git a/sys/netinet/tcp_syncache.c b/sys/netinet/tcp_syncache.c index 40defbe..0ef2f3d 100644 --- a/sys/netinet/tcp_syncache.c +++ b/sys/netinet/tcp_syncache.c @@ -1116,15 +1116,29 @@ syncache_respond(sc, m) ip = mtod(m, struct ip *); ip->ip_v = IPVERSION; ip->ip_hl = sizeof(struct ip) >> 2; - ip->ip_tos = 0; ip->ip_len = tlen; ip->ip_id = 0; ip->ip_off = 0; - ip->ip_ttl = ip_defttl; ip->ip_sum = 0; ip->ip_p = IPPROTO_TCP; ip->ip_src = sc->sc_inc.inc_laddr; ip->ip_dst = sc->sc_inc.inc_faddr; + ip->ip_ttl = sc->sc_tp->t_inpcb->inp_ip_ttl; /* XXX */ + ip->ip_tos = sc->sc_tp->t_inpcb->inp_ip_tos; /* XXX */ + + /* + * See if we should do MTU discovery. We do it only if the following + * are true: + * 1) we have a valid route to the destination + * 2) the MTU is not locked (if it is, then discovery has been + * disabled) + */ + if (path_mtu_discovery + && (rt != NULL) + && rt->rt_flags & RTF_UP + && !(rt->rt_rmx.rmx_locks & RTV_MTU)) { + ip->ip_off |= IP_DF; + } th = (struct tcphdr *)(ip + 1); } |