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tcp, udp: Replace loopback source address by gateway address

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This is symmetric with tap operation and addressing model, and
allows again to reach the guest behind the tap interface by
contacting the local address.

Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
This commit is contained in:
Stefano Brivio 2021-04-22 17:03:43 +02:00
parent 9ffb317cf9
commit 6488c3e848
2 changed files with 15 additions and 0 deletions
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8
tcp.c
View file

@ -1008,6 +1008,11 @@ static void tcp_conn_from_sock(struct ctx *c, int fd)
memset(&tc[s].a.a4.zero, 0, sizeof(tc[s].a.a4.zero));
memset(&tc[s].a.a4.one, 0xff, sizeof(tc[s].a.a4.one));
if (ntohl(sa4->sin_addr.s_addr) == INADDR_LOOPBACK ||
ntohl(sa4->sin_addr.s_addr) == INADDR_ANY)
sa4->sin_addr.s_addr = c->gw4;
memcpy(&tc[s].a.a4.a, &sa4->sin_addr, sizeof(tc[s].a.a4.a));
tc[s].sock_port = sa4->sin_port;
@ -1022,6 +1027,9 @@ static void tcp_conn_from_sock(struct ctx *c, int fd)
} else if (sa_l.ss_family == AF_INET6) {
struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *)&sa_r;
if (IN6_IS_ADDR_LOOPBACK(&sa6->sin6_addr))
memcpy(&sa6->sin6_addr, &c->gw6, sizeof(c->gw6));
memcpy(&tc[s].a.a6, &sa6->sin6_addr, sizeof(tc[s].a.a6));
tc[s].sock_port = sa6->sin6_port;

7
udp.c
View file

@ -84,6 +84,10 @@ void udp_sock_handler(struct ctx *c, int s, uint32_t events)
struct sockaddr_in *sr4 = (struct sockaddr_in *)&sr;
struct sockaddr_in *sl4 = (struct sockaddr_in *)&sl;
if (ntohl(sr4->sin_addr.s_addr) == INADDR_LOOPBACK ||
ntohl(sr4->sin_addr.s_addr) == INADDR_ANY)
sr4->sin_addr.s_addr = c->gw4;
memcpy(&a6.s6_addr[12], &sr4->sin_addr, sizeof(sr4->sin_addr));
uh->source = sr4->sin_port;
uh->dest = sl4->sin_port;
@ -94,6 +98,9 @@ void udp_sock_handler(struct ctx *c, int s, uint32_t events)
struct sockaddr_in6 *sr6 = (struct sockaddr_in6 *)&sr;
struct sockaddr_in6 *sl6 = (struct sockaddr_in6 *)&sl;
if (IN6_IS_ADDR_LOOPBACK(&sr6->sin6_addr))
memcpy(&sr6->sin6_addr, &c->gw6, sizeof(c->gw6));
uh->source = sr6->sin6_port;
uh->dest = sl6->sin6_port;
uh->len = htons(n + sizeof(*uh));