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tcp: Replace source address also if it's the same as the guest address

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...not just for loopback addresses, with the address of the default
gateway. Otherwise, the guest might receive packets with source and
destination set to the same address.

Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
This commit is contained in:
Stefano Brivio 2021-07-21 12:05:58 +02:00
parent 1642a04f48
commit b508079c4c
1 changed files with 4 additions and 2 deletions
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6
tcp.c
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@ -1814,7 +1814,8 @@ static void tcp_conn_from_sock(struct ctx *c, union epoll_ref ref,
if (ref.tcp.v6) {
struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *)&sa;
if (IN6_IS_ADDR_LOOPBACK(&sa6->sin6_addr))
if (IN6_IS_ADDR_LOOPBACK(&sa6->sin6_addr) ||
!memcmp(&sa6->sin6_addr, &c->addr6_seen, sizeof(c->addr6)))
memcpy(&sa6->sin6_addr, &c->gw6, sizeof(c->gw6));
memcpy(&conn->a.a6, &sa6->sin6_addr, sizeof(conn->a.a6));
@ -1835,7 +1836,8 @@ static void tcp_conn_from_sock(struct ctx *c, union epoll_ref ref,
memset(&conn->a.a4.one, 0xff, sizeof(conn->a.a4.one));
if (ntohl(sa4->sin_addr.s_addr) == INADDR_LOOPBACK ||
ntohl(sa4->sin_addr.s_addr) == INADDR_ANY)
ntohl(sa4->sin_addr.s_addr) == INADDR_ANY ||
sa4->sin_addr.s_addr == c->addr4_seen)
sa4->sin_addr.s_addr = c->gw4;
memcpy(&conn->a.a4.a, &sa4->sin_addr, sizeof(conn->a.a4.a));