[Qemu-devel] [PATCH 4/9] slirp: Make Socket structure IPv6 compatible

[Samuel Thibault <samuel.thibault@ens-lyon.org>]

From: Guillaume Subiron <maethor@subiron.org>

This patch replaces foreign and local address/port couples in Socket
structure by 2 sockaddr_storage which can be casted in sockaddr_in.
Direct access to address and port is still possible thanks to some
\#define, so retrocompatibility of the existing code is assured.

The ss_family field of sockaddr_storage is declared after each socket
creation.

The whole structure is also saved/restored when a Qemu session is
saved/restored.

This prepares for IPv6 support.

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>
---
 slirp/ip_icmp.c   |  2 ++
 slirp/slirp.c     | 51 ++++++++++++++++++++++++++++++++++++++++++---------
 slirp/socket.c    | 14 +++++++++++---
 slirp/socket.h    | 19 +++++++++++++++----
 slirp/tcp_input.c |  2 ++
 slirp/tcp_subr.c  |  2 ++
 slirp/udp.c       |  4 ++++
 7 files changed, 78 insertions(+), 16 deletions(-)

diff --git a/slirp/ip_icmp.c b/slirp/ip_icmp.c
index 23b9f0f..58b7ceb 100644
--- a/slirp/ip_icmp.c
+++ b/slirp/ip_icmp.c
@@ -170,8 +170,10 @@ icmp_input(struct mbuf *m, int hlen)
 	goto end_error;
       }
       so->so_m = m;
+      so->so_ffamily = AF_INET;
       so->so_faddr = ip->ip_dst;
       so->so_fport = htons(7);
+      so->so_lfamily = AF_INET;
       so->so_laddr = ip->ip_src;
       so->so_lport = htons(9);
       so->so_iptos = ip->ip_tos;
diff --git a/slirp/slirp.c b/slirp/slirp.c
index f8dc505..b900775 100644
--- a/slirp/slirp.c
+++ b/slirp/slirp.c
@@ -23,6 +23,7 @@
  */
 #include "qemu-common.h"
 #include "qemu/timer.h"
+#include "qemu/error-report.h"
 #include "sysemu/char.h"
 #include "slirp.h"
 #include "hw/hw.h"
@@ -234,7 +235,7 @@ Slirp *slirp_init(int restricted, struct in_addr vnetwork,
 
     slirp->opaque = opaque;
 
-    register_savevm(NULL, "slirp", 0, 3,
+    register_savevm(NULL, "slirp", 0, 4,
                     slirp_state_save, slirp_state_load, slirp);
 
     QTAILQ_INSERT_TAIL(&slirp_instances, slirp, entry);
@@ -1046,10 +1047,26 @@ static void slirp_sbuf_save(QEMUFile *f, struct sbuf *sbuf)
 static void slirp_socket_save(QEMUFile *f, struct socket *so)
 {
     qemu_put_be32(f, so->so_urgc);
-    qemu_put_be32(f, so->so_faddr.s_addr);
-    qemu_put_be32(f, so->so_laddr.s_addr);
-    qemu_put_be16(f, so->so_fport);
-    qemu_put_be16(f, so->so_lport);
+    qemu_put_be16(f, so->so_ffamily);
+    switch (so->so_ffamily) {
+    case AF_INET:
+        qemu_put_be32(f, so->so_faddr.s_addr);
+        qemu_put_be16(f, so->so_fport);
+        break;
+    default:
+        error_report(
+                "so_ffamily unknown, unable to save so_faddr and so_fport\n");
+    }
+    qemu_put_be16(f, so->so_lfamily);
+    switch (so->so_lfamily) {
+    case AF_INET:
+        qemu_put_be32(f, so->so_laddr.s_addr);
+        qemu_put_be16(f, so->so_lport);
+        break;
+    default:
+        error_report(
+                "so_ffamily unknown, unable to save so_laddr and so_lport\n");
+    }
     qemu_put_byte(f, so->so_iptos);
     qemu_put_byte(f, so->so_emu);
     qemu_put_byte(f, so->so_type);
@@ -1169,10 +1186,26 @@ static int slirp_socket_load(QEMUFile *f, struct socket *so)
         return -ENOMEM;
 
     so->so_urgc = qemu_get_be32(f);
-    so->so_faddr.s_addr = qemu_get_be32(f);
-    so->so_laddr.s_addr = qemu_get_be32(f);
-    so->so_fport = qemu_get_be16(f);
-    so->so_lport = qemu_get_be16(f);
+    so->so_ffamily = qemu_get_be16(f);
+    switch (so->so_ffamily) {
+    case AF_INET:
+        so->so_faddr.s_addr = qemu_get_be32(f);
+        so->so_fport = qemu_get_be16(f);
+        break;
+    default:
+        error_report(
+                "so_ffamily unknown, unable to restore so_faddr and so_lport\n");
+    }
+    so->so_lfamily = qemu_get_be16(f);
+    switch (so->so_lfamily) {
+    case AF_INET:
+        so->so_laddr.s_addr = qemu_get_be32(f);
+        so->so_lport = qemu_get_be16(f);
+        break;
+    default:
+        error_report(
+                "so_ffamily unknown, unable to restore so_laddr and so_lport\n");
+    }
     so->so_iptos = qemu_get_byte(f);
     so->so_emu = qemu_get_byte(f);
     so->so_type = qemu_get_byte(f);
diff --git a/slirp/socket.c b/slirp/socket.c
index 1673e3a..bf603c9 100644
--- a/slirp/socket.c
+++ b/slirp/socket.c
@@ -437,8 +437,8 @@ sowrite(struct socket *so)
 void
 sorecvfrom(struct socket *so)
 {
-	struct sockaddr_in addr;
-	socklen_t addrlen = sizeof(struct sockaddr_in);
+	struct sockaddr_storage addr;
+	socklen_t addrlen = sizeof(struct sockaddr_storage);
 
 	DEBUG_CALL("sorecvfrom");
 	DEBUG_ARG("so = %p", so);
@@ -527,7 +527,13 @@ sorecvfrom(struct socket *so)
 	     * If this packet was destined for CTL_ADDR,
 	     * make it look like that's where it came from, done by udp_output
 	     */
-	    udp_output(so, m, &addr);
+	    switch (so->so_ffamily) {
+	    case AF_INET:
+	        udp_output(so, m, (struct sockaddr_in *) &addr);
+	        break;
+	    default:
+	        break;
+	    }
 	  } /* rx error */
 	} /* if ping packet */
 }
@@ -619,6 +625,7 @@ tcp_listen(Slirp *slirp, uint32_t haddr, u_int hport, uint32_t laddr,
 
 	so->so_state &= SS_PERSISTENT_MASK;
 	so->so_state |= (SS_FACCEPTCONN | flags);
+	so->so_lfamily = AF_INET;
 	so->so_lport = lport; /* Kept in network format */
 	so->so_laddr.s_addr = laddr; /* Ditto */
 
@@ -645,6 +652,7 @@ tcp_listen(Slirp *slirp, uint32_t haddr, u_int hport, uint32_t laddr,
 	qemu_setsockopt(s, SOL_SOCKET, SO_OOBINLINE, &opt, sizeof(int));
 
 	getsockname(s,(struct sockaddr *)&addr,&addrlen);
+	so->so_ffamily = AF_INET;
 	so->so_fport = addr.sin_port;
 	if (addr.sin_addr.s_addr == 0 || addr.sin_addr.s_addr == loopback_addr.s_addr)
 	   so->so_faddr = slirp->vhost_addr;
diff --git a/slirp/socket.h b/slirp/socket.h
index 57e0407..e854903 100644
--- a/slirp/socket.h
+++ b/slirp/socket.h
@@ -31,10 +31,21 @@ struct socket {
   struct tcpiphdr *so_ti;	   /* Pointer to the original ti within
 				    * so_mconn, for non-blocking connections */
   int so_urgc;
-  struct in_addr so_faddr;	   /* foreign host table entry */
-  struct in_addr so_laddr;	   /* local host table entry */
-  uint16_t so_fport;		   /* foreign port */
-  uint16_t so_lport;		   /* local port */
+  union {   /* foreign host */
+      struct sockaddr_storage ss;
+      struct sockaddr_in sin;
+  } fhost;
+#define so_faddr fhost.sin.sin_addr
+#define so_fport fhost.sin.sin_port
+#define so_ffamily fhost.ss.ss_family
+
+  union {   /* local host */
+      struct sockaddr_storage ss;
+      struct sockaddr_in sin;
+  } lhost;
+#define so_laddr lhost.sin.sin_addr
+#define so_lport lhost.sin.sin_port
+#define so_lfamily lhost.ss.ss_family
 
   uint8_t	so_iptos;	/* Type of service */
   uint8_t	so_emu;		/* Is the socket emulated? */
diff --git a/slirp/tcp_input.c b/slirp/tcp_input.c
index 6b096ec..4c3191d 100644
--- a/slirp/tcp_input.c
+++ b/slirp/tcp_input.c
@@ -374,8 +374,10 @@ findso:
 	  sbreserve(&so->so_snd, TCP_SNDSPACE);
 	  sbreserve(&so->so_rcv, TCP_RCVSPACE);
 
+	  so->so_lfamily = AF_INET;
 	  so->so_laddr = ti->ti_src;
 	  so->so_lport = ti->ti_sport;
+	  so->so_ffamily = AF_INET;
 	  so->so_faddr = ti->ti_dst;
 	  so->so_fport = ti->ti_dport;
 
diff --git a/slirp/tcp_subr.c b/slirp/tcp_subr.c
index e161ed2..47262db 100644
--- a/slirp/tcp_subr.c
+++ b/slirp/tcp_subr.c
@@ -413,6 +413,7 @@ void tcp_connect(struct socket *inso)
             free(so); /* NOT sofree */
             return;
         }
+        so->so_lfamily = AF_INET;
         so->so_laddr = inso->so_laddr;
         so->so_lport = inso->so_lport;
     }
@@ -430,6 +431,7 @@ void tcp_connect(struct socket *inso)
     qemu_setsockopt(s, SOL_SOCKET, SO_OOBINLINE, &opt, sizeof(int));
     socket_set_nodelay(s);
 
+    so->so_ffamily = AF_INET;
     so->so_fport = addr.sin_port;
     so->so_faddr = addr.sin_addr;
     /* Translate connections from localhost to the real hostname */
diff --git a/slirp/udp.c b/slirp/udp.c
index ce63414..7a5c95b 100644
--- a/slirp/udp.c
+++ b/slirp/udp.c
@@ -190,6 +190,7 @@ udp_input(register struct mbuf *m, int iphlen)
 	  /*
 	   * Setup fields
 	   */
+	  so->so_lfamily = AF_INET;
 	  so->so_laddr = ip->ip_src;
 	  so->so_lport = uh->uh_sport;
 
@@ -202,6 +203,7 @@ udp_input(register struct mbuf *m, int iphlen)
 	   */
 	}
 
+        so->so_ffamily = AF_INET;
         so->so_faddr = ip->ip_dst; /* XXX */
         so->so_fport = uh->uh_dport; /* XXX */
 
@@ -376,6 +378,7 @@ udp_listen(Slirp *slirp, uint32_t haddr, u_int hport, uint32_t laddr,
 	socket_set_fast_reuse(so->s);
 
 	getsockname(so->s,(struct sockaddr *)&addr,&addrlen);
+	so->so_ffamily = AF_INET;
 	so->so_fport = addr.sin_port;
 	if (addr.sin_addr.s_addr == 0 ||
 	    addr.sin_addr.s_addr == loopback_addr.s_addr) {
@@ -383,6 +386,7 @@ udp_listen(Slirp *slirp, uint32_t haddr, u_int hport, uint32_t laddr,
 	} else {
 	   so->so_faddr = addr.sin_addr;
 	}
+	so->so_lfamily = AF_INET;
 	so->so_lport = lport;
 	so->so_laddr.s_addr = laddr;
 	if (flags != SS_FACCEPTONCE)
-- 
2.6.2