From: Guillaume Subiron <maet...@subiron.org>
This patch adds IPv6 case in TCP functions refactored by the last
patches.
This also adds IPv6 pseudo-header in tcpiphdr structure.
Finally, tcp_input() is called by ip6_input().
Signed-off-by: Guillaume Subiron <maet...@subiron.org>
Signed-off-by: Samuel Thibault <samuel.thiba...@ens-lyon.org>
Reviewed-by: Thomas Huth <th...@redhat.com>
---
slirp/ip6_input.c | 3 ++-
slirp/tcp.h | 2 ++
slirp/tcp_input.c | 58 +++++++++++++++++++++++++++++++++++++++++++-----------
slirp/tcp_output.c | 16 +++++++++++++++
slirp/tcp_subr.c | 32 ++++++++++++++++++++++++++++--
slirp/tcpip.h | 9 +++++++++
6 files changed, 106 insertions(+), 14 deletions(-)
diff --git a/slirp/ip6_input.c b/slirp/ip6_input.c
index 9ca6d32..c0b11e7 100644
--- a/slirp/ip6_input.c
+++ b/slirp/ip6_input.c
@@ -55,7 +55,8 @@ void ip6_input(struct mbuf *m)
*/
switch (ip6->ip_nh) {
case IPPROTO_TCP:
- icmp6_send_error(m, ICMP6_UNREACH, ICMP6_UNREACH_NO_ROUTE);
+ NTOHS(ip6->ip_pl);
+ tcp_input(m, sizeof(struct ip6), (struct socket *)NULL, AF_INET6);
break;
case IPPROTO_UDP:
udp6_input(m);
diff --git a/slirp/tcp.h b/slirp/tcp.h
index 2e2b403..61befcd 100644
--- a/slirp/tcp.h
+++ b/slirp/tcp.h
@@ -106,6 +106,8 @@ struct tcphdr {
*/
#undef TCP_MSS
#define TCP_MSS 1460
+#undef TCP6_MSS
+#define TCP6_MSS 1440
#undef TCP_MAXWIN
#define TCP_MAXWIN 65535 /* largest value for (unscaled) window
*/
diff --git a/slirp/tcp_input.c b/slirp/tcp_input.c
index 6427c90..76f719d 100644
--- a/slirp/tcp_input.c
+++ b/slirp/tcp_input.c
@@ -216,7 +216,8 @@ present:
void
tcp_input(struct mbuf *m, int iphlen, struct socket *inso, unsigned short af)
{
- struct ip save_ip, *ip;
+ struct ip save_ip, *ip;
+ struct ip6 save_ip6, *ip6;
register struct tcpiphdr *ti;
caddr_t optp = NULL;
int optlen = 0;
@@ -230,6 +231,7 @@ tcp_input(struct mbuf *m, int iphlen, struct socket *inso,
unsigned short af)
int ret;
struct sockaddr_storage lhost, fhost;
struct sockaddr_in *lhost4, *fhost4;
+ struct sockaddr_in6 *lhost6, *fhost6;
struct ex_list *ex_ptr;
Slirp *slirp;
@@ -256,6 +258,9 @@ tcp_input(struct mbuf *m, int iphlen, struct socket *inso,
unsigned short af)
}
slirp = m->slirp;
+ ip = mtod(m, struct ip *);
+ ip6 = mtod(m, struct ip6 *);
+
switch (af) {
case AF_INET:
if (iphlen > sizeof(struct ip)) {
@@ -264,12 +269,6 @@ tcp_input(struct mbuf *m, int iphlen, struct socket *inso,
unsigned short af)
}
/* XXX Check if too short */
-
- /*
- * Save a copy of the IP header in case we want restore it
- * for sending an ICMP error message in response.
- */
- ip = mtod(m, struct ip *);
save_ip = *ip;
save_ip.ip_len += iphlen;
@@ -295,16 +294,36 @@ tcp_input(struct mbuf *m, int iphlen, struct socket
*inso, unsigned short af)
ti->ti_dst = save_ip.ip_dst;
ti->ti_pr = save_ip.ip_p;
ti->ti_len = htons((uint16_t)tlen);
- len = ((sizeof(struct tcpiphdr) - sizeof(struct tcphdr)) + tlen);
- if (cksum(m, len)) {
- goto drop;
- }
+ break;
+
+ case AF_INET6:
+ save_ip6 = *ip6;
+ m->m_data -= sizeof(struct tcpiphdr) - (sizeof(struct ip6)
+ + sizeof(struct tcphdr));
+ m->m_len += sizeof(struct tcpiphdr) - (sizeof(struct ip6)
+ + sizeof(struct tcphdr));
+ ti = mtod(m, struct tcpiphdr *);
+
+ tlen = ip6->ip_pl;
+ tcpiphdr2qlink(ti)->next = tcpiphdr2qlink(ti)->prev = NULL;
+ memset(&ti->ih_mbuf, 0 , sizeof(struct mbuf_ptr));
+ memset(&ti->ti, 0, sizeof(ti->ti));
+ ti->ti_x0 = 0;
+ ti->ti_src6 = save_ip6.ip_src;
+ ti->ti_dst6 = save_ip6.ip_dst;
+ ti->ti_nh6 = save_ip6.ip_nh;
+ ti->ti_len = htons((uint16_t)tlen);
break;
default:
g_assert_not_reached();
}
+ len = ((sizeof(struct tcpiphdr) - sizeof(struct tcphdr)) + tlen);
+ if (cksum(m, len)) {
+ goto drop;
+ }
+
/*
* Check that TCP offset makes sense,
* pull out TCP options and adjust length. XXX
@@ -350,6 +369,14 @@ findso:
fhost4->sin_addr = ti->ti_dst;
fhost4->sin_port = ti->ti_dport;
break;
+ case AF_INET6:
+ lhost6 = (struct sockaddr_in6 *) &lhost;
+ lhost6->sin6_addr = ti->ti_src6;
+ lhost6->sin6_port = ti->ti_sport;
+ fhost6 = (struct sockaddr_in6 *) &fhost;
+ fhost6->sin6_addr = ti->ti_dst6;
+ fhost6->sin6_port = ti->ti_dport;
+ break;
default:
g_assert_not_reached();
}
@@ -408,6 +435,8 @@ findso:
case AF_INET:
so->so_iptos = ((struct ip *)ti)->ip_tos;
break;
+ case AF_INET6:
+ break;
default:
g_assert_not_reached();
}
@@ -642,6 +671,9 @@ findso:
case AF_INET:
*ip = save_ip;
break;
+ case AF_INET6:
+ *ip6 = save_ip6;
+ break;
default:
g_assert_not_reached();
}
@@ -1517,6 +1549,10 @@ tcp_mss(struct tcpcb *tp, u_int offer)
mss = min(IF_MTU, IF_MRU) - sizeof(struct tcphdr)
+ sizeof(struct ip);
break;
+ case AF_INET6:
+ mss = min(IF_MTU, IF_MRU) - sizeof(struct tcphdr)
+ + sizeof(struct ip6);
+ break;
default:
g_assert_not_reached();
}
diff --git a/slirp/tcp_output.c b/slirp/tcp_output.c
index eec8902..99b0a9b 100644
--- a/slirp/tcp_output.c
+++ b/slirp/tcp_output.c
@@ -63,6 +63,7 @@ tcp_output(struct tcpcb *tp)
register struct mbuf *m;
register struct tcpiphdr *ti, tcpiph_save;
struct ip *ip;
+ struct ip6 *ip6;
u_char opt[MAX_TCPOPTLEN];
unsigned optlen, hdrlen;
int idle, sendalot;
@@ -468,6 +469,21 @@ send:
error = ip_output(so, m);
break;
+ case AF_INET6:
+ m->m_data += sizeof(struct tcpiphdr) - sizeof(struct tcphdr)
+ - sizeof(struct ip6);
+ m->m_len -= sizeof(struct tcpiphdr) - sizeof(struct tcphdr)
+ - sizeof(struct ip6);
+ ip6 = mtod(m, struct ip6 *);
+
+ 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;
+
+ error = ip6_output(so, m, 0);
+ break;
+
default:
g_assert_not_reached();
}
diff --git a/slirp/tcp_subr.c b/slirp/tcp_subr.c
index c16b29d..dbfd2c6 100644
--- a/slirp/tcp_subr.c
+++ b/slirp/tcp_subr.c
@@ -88,6 +88,15 @@ tcp_template(struct tcpcb *tp)
n->ti_dport = so->so_lport;
break;
+ case AF_INET6:
+ n->ti_nh6 = IPPROTO_TCP;
+ n->ti_len = htons(sizeof(struct tcphdr));
+ n->ti_src6 = so->so_faddr6;
+ n->ti_dst6 = so->so_laddr6;
+ n->ti_sport = so->so_fport6;
+ n->ti_dport = so->so_lport6;
+ break;
+
default:
g_assert_not_reached();
}
@@ -156,6 +165,10 @@ tcp_respond(struct tcpcb *tp, struct tcpiphdr *ti, struct
mbuf *m,
xchg(ti->ti_dst.s_addr, ti->ti_src.s_addr, uint32_t);
xchg(ti->ti_dport, ti->ti_sport, uint16_t);
break;
+ case AF_INET6:
+ xchg(ti->ti_dst6, ti->ti_src6, struct in6_addr);
+ xchg(ti->ti_dport, ti->ti_sport, uint16_t);
+ break;
default:
g_assert_not_reached();
}
@@ -182,6 +195,7 @@ tcp_respond(struct tcpcb *tp, struct tcpiphdr *ti, struct
mbuf *m,
struct tcpiphdr tcpiph_save = *(mtod(m, struct tcpiphdr *));
struct ip *ip;
+ struct ip6 *ip6;
switch (af) {
case AF_INET:
@@ -201,7 +215,21 @@ tcp_respond(struct tcpcb *tp, struct tcpiphdr *ti, struct
mbuf *m,
ip->ip_ttl = IPDEFTTL;
}
- (void) ip_output((struct socket *)0, m);
+ ip_output(NULL, m);
+ break;
+
+ case AF_INET6:
+ m->m_data += sizeof(struct tcpiphdr) - sizeof(struct tcphdr)
+ - sizeof(struct ip6);
+ m->m_len -= sizeof(struct tcpiphdr) - sizeof(struct tcphdr)
+ - sizeof(struct ip6);
+ ip6 = mtod(m, struct ip6 *);
+ ip6->ip_pl = tlen;
+ ip6->ip_dst = tcpiph_save.ti_dst6;
+ ip6->ip_src = tcpiph_save.ti_src6;
+ ip6->ip_nh = tcpiph_save.ti_nh6;
+
+ ip6_output(NULL, m, 0);
break;
default:
@@ -225,7 +253,7 @@ tcp_newtcpcb(struct socket *so)
memset((char *) tp, 0, sizeof(struct tcpcb));
tp->seg_next = tp->seg_prev = (struct tcpiphdr*)tp;
- tp->t_maxseg = TCP_MSS;
+ tp->t_maxseg = (so->so_ffamily == AF_INET) ? TCP_MSS : TCP6_MSS;
tp->t_flags = TCP_DO_RFC1323 ? (TF_REQ_SCALE|TF_REQ_TSTMP) : 0;
tp->t_socket = so;
diff --git a/slirp/tcpip.h b/slirp/tcpip.h
index 3c5d127..124b4a9 100644
--- a/slirp/tcpip.h
+++ b/slirp/tcpip.h
@@ -45,6 +45,12 @@ struct tcpiphdr {
uint8_t ih_x1; /* (unused) */
uint8_t ih_pr; /* protocol */
} ti_i4;
+ struct {
+ struct in6_addr ih_src;
+ struct in6_addr ih_dst;
+ uint8_t ih_x1;
+ uint8_t ih_nh;
+ } ti_i6;
} ti;
uint16_t ti_x0;
uint16_t ti_len; /* protocol length */
@@ -54,6 +60,9 @@ struct tcpiphdr {
#define ti_pr ti.ti_i4.ih_pr
#define ti_src ti.ti_i4.ih_src
#define ti_dst ti.ti_i4.ih_dst
+#define ti_src6 ti.ti_i6.ih_src
+#define ti_dst6 ti.ti_i6.ih_dst
+#define ti_nh6 ti.ti_i6.ih_nh
#define ti_sport ti_t.th_sport
#define ti_dport ti_t.th_dport
#define ti_seq ti_t.th_seq
--
2.7.0
