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If path mtu discovery is enabled set the DF bit in all cases we

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send packets on a tcp connection.

PR:		kern/60889
Tested by:	Richard Wendland <richard@wendland.org.uk>
Approved by:	re (scottl)
This commit is contained in:
Andre Oppermann 2004-01-08 11:17:11 +00:00
parent e0f630ea7a
commit bf87c82ebb
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=124248
2 changed files with 8 additions and 0 deletions
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4
sys/netinet/tcp_subr.c
View File

@ -459,6 +459,8 @@ tcp_respond(tp, ipgen, th, m, ack, seq, flags)
tlen += sizeof (struct tcpiphdr);
ip->ip_len = tlen;
ip->ip_ttl = ip_defttl;
if (path_mtu_discovery)
ip->ip_off |= IP_DF;
}
m->m_len = tlen;
m->m_pkthdr.len = tlen;
@ -1733,6 +1735,8 @@ tcp_twrespond(struct tcptw *tw, struct socket *so, struct mbuf *msrc,
m->m_pkthdr.csum_flags = CSUM_TCP;
m->m_pkthdr.csum_data = offsetof(struct tcphdr, th_sum);
ip->ip_len = m->m_pkthdr.len;
if (path_mtu_discovery)
ip->ip_off |= IP_DF;
error = ip_output(m, inp->inp_options, NULL,
(tw->tw_so_options & SO_DONTROUTE), NULL, inp);
}

4
sys/netinet/tcp_timewait.c
View File

@ -459,6 +459,8 @@ tcp_respond(tp, ipgen, th, m, ack, seq, flags)
tlen += sizeof (struct tcpiphdr);
ip->ip_len = tlen;
ip->ip_ttl = ip_defttl;
if (path_mtu_discovery)
ip->ip_off |= IP_DF;
}
m->m_len = tlen;
m->m_pkthdr.len = tlen;
@ -1733,6 +1735,8 @@ tcp_twrespond(struct tcptw *tw, struct socket *so, struct mbuf *msrc,
m->m_pkthdr.csum_flags = CSUM_TCP;
m->m_pkthdr.csum_data = offsetof(struct tcphdr, th_sum);
ip->ip_len = m->m_pkthdr.len;
if (path_mtu_discovery)
ip->ip_off |= IP_DF;
error = ip_output(m, inp->inp_options, NULL,
(tw->tw_so_options & SO_DONTROUTE), NULL, inp);
}