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slirp: Factorizing address translation 

This patch factorizes some duplicate code into a new function,
sotranslate_out(). This function perform the address translation when a
packet is transmitted to the host network. If the packet is destinated
to the host, the loopback address is used, and if the packet is
destinated to the virtual DNS, the real DNS address is used. This code
is just a copy of the existent, but factorized and ready to manage the
IPv6 case.

On the same model, the major part of udp_output() code is moved into a
new sotranslate_in(). This function is directly used in sorecvfrom(),
like sotranslate_out() in sosendto().
udp_output() becoming useless, it is removed and udp_output2() is
renamed into udp_output(). This adds consistency with the udp6_output()
function introduced by further patches.

Lastly, this factorizes some duplicate code into sotranslate_accept(), which
performs the address translation when a connection is established on the host
for port forwarding: if it comes from localhost, the host virtual address is
used instead.

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>
Signed-off-by: Jason Wang <jasowang@redhat.com>
This commit is contained in:
Guillaume Subiron 2015-12-19 22:24:59 +01:00 committed by Jason Wang
parent eae303ff23
commit 5379229a27
8 changed files with 115 additions and 102 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
slirp/bootp.c
View File

@ -325,7 +325,7 @@ static void bootp_reply(Slirp *slirp, const struct bootp_t *bp)
m->m_len = sizeof(struct bootp_t) -
sizeof(struct ip) - sizeof(struct udphdr);
udp_output2(NULL, m, &saddr, &daddr, IPTOS_LOWDELAY);
udp_output(NULL, m, &saddr, &daddr, IPTOS_LOWDELAY);
}
void bootp_input(struct mbuf *m)

19
slirp/ip_icmp.c
View File

@ -157,7 +157,7 @@ icmp_input(struct mbuf *m, int hlen)
goto freeit;
} else {
struct socket *so;
struct sockaddr_in addr;
struct sockaddr_storage addr;
if ((so = socreate(slirp)) == NULL) goto freeit;
if (icmp_send(so, m, hlen) == 0) {
return;
@ -181,20 +181,9 @@ icmp_input(struct mbuf *m, int hlen)
so->so_state = SS_ISFCONNECTED;
/* Send the packet */
addr.sin_family = AF_INET;
if ((so->so_faddr.s_addr & slirp->vnetwork_mask.s_addr) ==
slirp->vnetwork_addr.s_addr) {
/* It's an alias */
if (so->so_faddr.s_addr == slirp->vnameserver_addr.s_addr) {
if (get_dns_addr(&addr.sin_addr) < 0)
addr.sin_addr = loopback_addr;
} else {
addr.sin_addr = loopback_addr;
}
} else {
addr.sin_addr = so->so_faddr;
}
addr.sin_port = so->so_fport;
addr = so->fhost.ss;
sotranslate_out(so, &addr);
if(sendto(so->s, icmp_ping_msg, strlen(icmp_ping_msg), 0,
(struct sockaddr *)&addr, sizeof(addr)) == -1) {
DEBUG_MISC((dfd,"icmp_input udp sendto tx errno = %d-%s\n",

112
slirp/socket.c
View File

@ -438,6 +438,7 @@ void
sorecvfrom(struct socket *so)
{
struct sockaddr_storage addr;
struct sockaddr_storage saddr, daddr;
socklen_t addrlen = sizeof(struct sockaddr_storage);
DEBUG_CALL("sorecvfrom");
@ -525,11 +526,17 @@ 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
* make it look like that's where it came from
*/
saddr = addr;
sotranslate_in(so, &saddr);
daddr = so->lhost.ss;
switch (so->so_ffamily) {
case AF_INET:
udp_output(so, m, (struct sockaddr_in *) &addr);
udp_output(so, m, (struct sockaddr_in *) &saddr,
(struct sockaddr_in *) &daddr,
so->so_iptos);
break;
default:
break;
@ -544,33 +551,20 @@ sorecvfrom(struct socket *so)
int
sosendto(struct socket *so, struct mbuf *m)
{
Slirp *slirp = so->slirp;
int ret;
struct sockaddr_in addr;
struct sockaddr_storage addr;
DEBUG_CALL("sosendto");
DEBUG_ARG("so = %p", so);
DEBUG_ARG("m = %p", m);
addr.sin_family = AF_INET;
if ((so->so_faddr.s_addr & slirp->vnetwork_mask.s_addr) ==
slirp->vnetwork_addr.s_addr) {
/* It's an alias */
if (so->so_faddr.s_addr == slirp->vnameserver_addr.s_addr) {
if (get_dns_addr(&addr.sin_addr) < 0)
addr.sin_addr = loopback_addr;
} else {
addr.sin_addr = loopback_addr;
}
} else
addr.sin_addr = so->so_faddr;
addr.sin_port = so->so_fport;
DEBUG_MISC((dfd, " sendto()ing, addr.sin_port=%d, addr.sin_addr.s_addr=%.16s\n", ntohs(addr.sin_port), inet_ntoa(addr.sin_addr)));
addr = so->fhost.ss;
DEBUG_CALL(" sendto()ing)");
sotranslate_out(so, &addr);
/* Don't care what port we get */
ret = sendto(so->s, m->m_data, m->m_len, 0,
(struct sockaddr *)&addr, sizeof (struct sockaddr));
(struct sockaddr *)&addr, sizeof(addr));
if (ret < 0)
return -1;
@ -726,3 +720,81 @@ sofwdrain(struct socket *so)
else
sofcantsendmore(so);
}
/*
* Translate addr in host addr when it is a virtual address
*/
void sotranslate_out(struct socket *so, struct sockaddr_storage *addr)
{
Slirp *slirp = so->slirp;
struct sockaddr_in *sin = (struct sockaddr_in *)addr;
switch (addr->ss_family) {
case AF_INET:
if ((so->so_faddr.s_addr & slirp->vnetwork_mask.s_addr) ==
slirp->vnetwork_addr.s_addr) {
/* It's an alias */
if (so->so_faddr.s_addr == slirp->vnameserver_addr.s_addr) {
if (get_dns_addr(&sin->sin_addr) < 0) {
sin->sin_addr = loopback_addr;
}
} else {
sin->sin_addr = loopback_addr;
}
}
DEBUG_MISC((dfd, " addr.sin_port=%d, "
"addr.sin_addr.s_addr=%.16s\n",
ntohs(sin->sin_port), inet_ntoa(sin->sin_addr)));
break;
default:
break;
}
}
void sotranslate_in(struct socket *so, struct sockaddr_storage *addr)
{
Slirp *slirp = so->slirp;
struct sockaddr_in *sin = (struct sockaddr_in *)addr;
switch (addr->ss_family) {
case AF_INET:
if ((so->so_faddr.s_addr & slirp->vnetwork_mask.s_addr) ==
slirp->vnetwork_addr.s_addr) {
uint32_t inv_mask = ~slirp->vnetwork_mask.s_addr;
if ((so->so_faddr.s_addr & inv_mask) == inv_mask) {
sin->sin_addr = slirp->vhost_addr;
} else if (sin->sin_addr.s_addr == loopback_addr.s_addr ||
so->so_faddr.s_addr != slirp->vhost_addr.s_addr) {
sin->sin_addr = so->so_faddr;
}
}
break;
default:
break;
}
}
/*
* Translate connections from localhost to the real hostname
*/
void sotranslate_accept(struct socket *so)
{
Slirp *slirp = so->slirp;
switch (so->so_ffamily) {
case AF_INET:
if (so->so_faddr.s_addr == INADDR_ANY ||
(so->so_faddr.s_addr & loopback_mask) ==
(loopback_addr.s_addr & loopback_mask)) {
so->so_faddr = slirp->vhost_addr;
}
break;
default:
break;
}
}

5
slirp/socket.h
View File

@ -105,4 +105,9 @@ struct iovec; /* For win32 */
size_t sopreprbuf(struct socket *so, struct iovec *iov, int *np);
int soreadbuf(struct socket *so, const char *buf, int size);
void sotranslate_out(struct socket *, struct sockaddr_storage *);
void sotranslate_in(struct socket *, struct sockaddr_storage *);
void sotranslate_accept(struct socket *);
#endif /* _SOCKET_H_ */

33
slirp/tcp_subr.c
View File

@ -326,7 +326,6 @@ tcp_sockclosed(struct tcpcb *tp)
*/
int tcp_fconnect(struct socket *so)
{
Slirp *slirp = so->slirp;
int ret=0;
DEBUG_CALL("tcp_fconnect");
@ -334,30 +333,17 @@ int tcp_fconnect(struct socket *so)
if( (ret = so->s = qemu_socket(AF_INET,SOCK_STREAM,0)) >= 0) {
int opt, s=so->s;
struct sockaddr_in addr;
struct sockaddr_storage addr;
qemu_set_nonblock(s);
socket_set_fast_reuse(s);
opt = 1;
qemu_setsockopt(s, SOL_SOCKET, SO_OOBINLINE, &opt, sizeof(opt));
addr.sin_family = AF_INET;
if ((so->so_faddr.s_addr & slirp->vnetwork_mask.s_addr) ==
slirp->vnetwork_addr.s_addr) {
/* It's an alias */
if (so->so_faddr.s_addr == slirp->vnameserver_addr.s_addr) {
if (get_dns_addr(&addr.sin_addr) < 0)
addr.sin_addr = loopback_addr;
} else {
addr.sin_addr = loopback_addr;
}
} else
addr.sin_addr = so->so_faddr;
addr.sin_port = so->so_fport;
addr = so->fhost.ss;
DEBUG_CALL(" connect()ing")
sotranslate_out(so, &addr);
DEBUG_MISC((dfd, " connect()ing, addr.sin_port=%d, "
"addr.sin_addr.s_addr=%.16s\n",
ntohs(addr.sin_port), inet_ntoa(addr.sin_addr)));
/* We don't care what port we get */
ret = connect(s,(struct sockaddr *)&addr,sizeof (addr));
@ -431,15 +417,8 @@ 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 */
if (so->so_faddr.s_addr == 0 ||
(so->so_faddr.s_addr & loopback_mask) ==
(loopback_addr.s_addr & loopback_mask)) {
so->so_faddr = slirp->vhost_addr;
}
so->fhost.sin = addr;
sotranslate_accept(so);
/* Close the accept() socket, set right state */
if (inso->so_state & SS_FACCEPTONCE) {

6
slirp/tftp.c
View File

@ -155,7 +155,7 @@ static int tftp_send_oack(struct tftp_session *spt,
m->m_len = sizeof(struct tftp_t) - 514 + n -
sizeof(struct ip) - sizeof(struct udphdr);
udp_output2(NULL, m, &saddr, &daddr, IPTOS_LOWDELAY);
udp_output(NULL, m, &saddr, &daddr, IPTOS_LOWDELAY);
return 0;
}
@ -193,7 +193,7 @@ static void tftp_send_error(struct tftp_session *spt,
m->m_len = sizeof(struct tftp_t) - 514 + 3 + strlen(msg) -
sizeof(struct ip) - sizeof(struct udphdr);
udp_output2(NULL, m, &saddr, &daddr, IPTOS_LOWDELAY);
udp_output(NULL, m, &saddr, &daddr, IPTOS_LOWDELAY);
out:
tftp_session_terminate(spt);
@ -243,7 +243,7 @@ static void tftp_send_next_block(struct tftp_session *spt,
m->m_len = sizeof(struct tftp_t) - (512 - nobytes) -
sizeof(struct ip) - sizeof(struct udphdr);
udp_output2(NULL, m, &saddr, &daddr, IPTOS_LOWDELAY);
udp_output(NULL, m, &saddr, &daddr, IPTOS_LOWDELAY);
if (nobytes == 512) {
tftp_session_update(spt);

37
slirp/udp.c
View File

@ -236,7 +236,7 @@ bad:
m_free(m);
}
int udp_output2(struct socket *so, struct mbuf *m,
int udp_output(struct socket *so, struct mbuf *m,
struct sockaddr_in *saddr, struct sockaddr_in *daddr,
int iptos)
{
@ -287,31 +287,6 @@ int udp_output2(struct socket *so, struct mbuf *m,
return (error);
}
int udp_output(struct socket *so, struct mbuf *m,
struct sockaddr_in *addr)
{
Slirp *slirp = so->slirp;
struct sockaddr_in saddr, daddr;
saddr = *addr;
if ((so->so_faddr.s_addr & slirp->vnetwork_mask.s_addr) ==
slirp->vnetwork_addr.s_addr) {
uint32_t inv_mask = ~slirp->vnetwork_mask.s_addr;
if ((so->so_faddr.s_addr & inv_mask) == inv_mask) {
saddr.sin_addr = slirp->vhost_addr;
} else if (addr->sin_addr.s_addr == loopback_addr.s_addr ||
so->so_faddr.s_addr != slirp->vhost_addr.s_addr) {
saddr.sin_addr = so->so_faddr;
}
}
daddr.sin_addr = so->so_laddr;
daddr.sin_port = so->so_lport;
return udp_output2(so, m, &saddr, &daddr, so->so_iptos);
}
int
udp_attach(struct socket *so)
{
@ -378,14 +353,8 @@ 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) {
so->so_faddr = slirp->vhost_addr;
} else {
so->so_faddr = addr.sin_addr;
}
so->fhost.sin = addr;
sotranslate_accept(so);
so->so_lfamily = AF_INET;
so->so_lport = lport;
so->so_laddr.s_addr = laddr;

3
slirp/udp.h
View File

@ -76,12 +76,11 @@ struct mbuf;
void udp_init(Slirp *);
void udp_cleanup(Slirp *);
void udp_input(register struct mbuf *, int);
int udp_output(struct socket *, struct mbuf *, struct sockaddr_in *);
int udp_attach(struct socket *);
void udp_detach(struct socket *);
struct socket * udp_listen(Slirp *, uint32_t, u_int, uint32_t, u_int,
int);
int udp_output2(struct socket *so, struct mbuf *m,
int udp_output(struct socket *so, struct mbuf *m,
struct sockaddr_in *saddr, struct sockaddr_in *daddr,
int iptos);
#endif