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tcp, udp: Replace loopback source address by gateway address

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

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.zero, 0, sizeof(tc[s].a.a4.zero));
memset(&tc[s].a.a4.one, 0xff, sizeof(tc[s].a.a4.one)); 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)); memcpy(&tc[s].a.a4.a, &sa4->sin_addr, sizeof(tc[s].a.a4.a));
tc[s].sock_port = sa4->sin_port; 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) { } else if (sa_l.ss_family == AF_INET6) {
struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *)&sa_r; 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)); memcpy(&tc[s].a.a6, &sa6->sin6_addr, sizeof(tc[s].a.a6));
tc[s].sock_port = sa6->sin6_port; 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 *sr4 = (struct sockaddr_in *)&sr;
struct sockaddr_in *sl4 = (struct sockaddr_in *)&sl; 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)); memcpy(&a6.s6_addr[12], &sr4->sin_addr, sizeof(sr4->sin_addr));
uh->source = sr4->sin_port; uh->source = sr4->sin_port;
uh->dest = sl4->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 *sr6 = (struct sockaddr_in6 *)&sr;
struct sockaddr_in6 *sl6 = (struct sockaddr_in6 *)&sl; 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->source = sr6->sin6_port;
uh->dest = sl6->sin6_port; uh->dest = sl6->sin6_port;
uh->len = htons(n + sizeof(*uh)); uh->len = htons(n + sizeof(*uh));