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Fix total IP header length in forwarded TCP packets 

When forwarding TCP packets, the internal tcpiphdr struct length was wrongly
used inside the IP header. This commit changes the behaviour to what is used
by tcp_output.c, using the correct full IP header + payload length.

Signed-off-by: Sjors Gielen <sjors@sjorsgielen.nl>
Signed-off-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
This commit is contained in:
Sjors Gielen 2017-05-24 17:51:12 +00:00 committed by Samuel Thibault
parent 7d8246960e
commit 2e30230aa9
1 changed files with 2 additions and 2 deletions
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4
slirp/tcp_subr.c
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@ -204,7 +204,7 @@ tcp_respond(struct tcpcb *tp, struct tcpiphdr *ti, struct mbuf *m,
m->m_len -= sizeof(struct tcpiphdr) - sizeof(struct tcphdr)
- sizeof(struct ip);
ip = mtod(m, struct ip *);
ip->ip_len = tlen;
ip->ip_len = m->m_len;
ip->ip_dst = tcpiph_save.ti_dst;
ip->ip_src = tcpiph_save.ti_src;
ip->ip_p = tcpiph_save.ti_pr;
@ -224,7 +224,7 @@ tcp_respond(struct tcpcb *tp, struct tcpiphdr *ti, struct mbuf *m,
m->m_len -= sizeof(struct tcpiphdr) - sizeof(struct tcphdr)
- sizeof(struct ip6);
ip6 = mtod(m, struct ip6 *);
ip6->ip_pl = tlen;
ip6->ip_pl = tcpiph_save.ti_len;
ip6->ip_dst = tcpiph_save.ti_dst6;
ip6->ip_src = tcpiph_save.ti_src6;
ip6->ip_nh = tcpiph_save.ti_nh6;