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tap: Fill the IPv6 flow label field to represent flow association

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This isn't optional: TCP streams must carry a unique, hard-to-guess,
non-zero label for each direction. Linux, probably among others,
will otherwise refuse to associate packets in a given stream to the
same connection.

Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
This commit is contained in:
Stefano Brivio
2021-07-26 07:30:57 +02:00
parent 17765f8de0
commit 16b08367a5
5 changed files with 25 additions and 10 deletions
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4
icmp.c
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@@ -98,7 +98,7 @@ void icmp_sock_handler(struct ctx *c, union epoll_ref ref, uint32_t events,
icmp_id_map[V6][id].seq = seq;
}
tap_ip_send(c, &sr6->sin6_addr, IPPROTO_ICMPV6, buf, n);
tap_ip_send(c, &sr6->sin6_addr, IPPROTO_ICMPV6, buf, n, 0);
} else {
struct sockaddr_in *sr4 = (struct sockaddr_in *)&sr;
struct icmphdr *ih = (struct icmphdr *)buf;
@@ -115,7 +115,7 @@ void icmp_sock_handler(struct ctx *c, union epoll_ref ref, uint32_t events,
memcpy(&a6.s6_addr[12], &sr4->sin_addr, sizeof(sr4->sin_addr));
tap_ip_send(c, &a6, IPPROTO_ICMP, buf, n);
tap_ip_send(c, &a6, IPPROTO_ICMP, buf, n, 0);
}
}