diff options
| author | Guillaume Subiron <maethor@subiron.org> | 2016-03-15 10:31:20 +0100 |
|---|---|---|
| committer | Samuel Thibault <samuel.thibault@ens-lyon.org> | 2016-03-15 10:35:11 +0100 |
| commit | 98c63057d2144fb81681580cd84c13c93794c96e (patch) | |
| tree | 6f8ae513422d915b55210f4bf350c3a051daf1c4 /slirp/tcp_subr.c | |
| parent | 15d62af4b6068d1bac1806ca4625b6d4c475eb09 (diff) | |
slirp: Factorizing tcpiphdr structure with an union
This patch factorizes the tcpiphdr structure to put the IPv4 fields in
an union, for addition of version 6 in further patch.
Using some macros, retrocompatibility of the existing code is assured.
This patch also fixes the SLIRP_MSIZE and margin computation in various
functions, and makes them compatible with the new tcpiphdr structure,
whose size will be bigger than sizeof(struct tcphdr) + sizeof(struct ip)
Signed-off-by: Guillaume Subiron <maethor@subiron.org>
Signed-off-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Diffstat (limited to 'slirp/tcp_subr.c')
| -rw-r--r-- | slirp/tcp_subr.c | 31 |
1 files changed, 22 insertions, 9 deletions
diff --git a/slirp/tcp_subr.c b/slirp/tcp_subr.c index b1aa1f23f4..cd021dffcf 100644 --- a/slirp/tcp_subr.c +++ b/slirp/tcp_subr.c @@ -76,9 +76,10 @@ tcp_template(struct tcpcb *tp) register struct tcpiphdr *n = &tp->t_template; n->ti_mbuf = NULL; - n->ti_x1 = 0; + memset(&n->ti, 0, sizeof(n->ti)); + n->ti_x0 = 0; n->ti_pr = IPPROTO_TCP; - n->ti_len = htons(sizeof (struct tcpiphdr) - sizeof (struct ip)); + n->ti_len = htons(sizeof(struct tcphdr)); n->ti_src = so->so_faddr; n->ti_dst = so->so_laddr; n->ti_sport = so->so_fport; @@ -131,6 +132,7 @@ tcp_respond(struct tcpcb *tp, struct tcpiphdr *ti, struct mbuf *m, m->m_data += IF_MAXLINKHDR; *mtod(m, struct tcpiphdr *) = *ti; ti = mtod(m, struct tcpiphdr *); + memset(&ti->ti, 0, sizeof(ti->ti)); flags = TH_ACK; } else { /* @@ -150,8 +152,8 @@ tcp_respond(struct tcpcb *tp, struct tcpiphdr *ti, struct mbuf *m, tlen += sizeof (struct tcpiphdr); m->m_len = tlen; - ti->ti_mbuf = NULL; - ti->ti_x1 = 0; + ti->ti_mbuf = NULL; + ti->ti_x0 = 0; ti->ti_seq = htonl(seq); ti->ti_ack = htonl(ack); ti->ti_x2 = 0; @@ -164,12 +166,23 @@ tcp_respond(struct tcpcb *tp, struct tcpiphdr *ti, struct mbuf *m, ti->ti_urp = 0; ti->ti_sum = 0; ti->ti_sum = cksum(m, tlen); - ((struct ip *)ti)->ip_len = tlen; - if(flags & TH_RST) - ((struct ip *)ti)->ip_ttl = MAXTTL; - else - ((struct ip *)ti)->ip_ttl = IPDEFTTL; + struct tcpiphdr tcpiph_save = *(mtod(m, struct tcpiphdr *)); + m->m_data += sizeof(struct tcpiphdr) - sizeof(struct tcphdr) + - sizeof(struct ip); + m->m_len -= sizeof(struct tcpiphdr) - sizeof(struct tcphdr) + - sizeof(struct ip); + struct ip *ip = mtod(m, struct ip *); + ip->ip_len = tlen; + ip->ip_dst = tcpiph_save.ti_dst; + ip->ip_src = tcpiph_save.ti_src; + ip->ip_p = tcpiph_save.ti_pr; + + if (flags & TH_RST) { + ip->ip_ttl = MAXTTL; + } else { + ip->ip_ttl = IPDEFTTL; + } (void) ip_output((struct socket *)0, m); } |