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

Browse source 
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

7
tcp.c
View file

@ -469,6 +469,7 @@ struct tcp_tap_conn {
uint32_t seq_from_tap;
uint32_t seq_ack_to_tap;
uint32_t seq_init_from_tap;
uint32_t seq_init_to_tap;
uint64_t tcpi_acked_last;
int ws_allowed;
@ -934,7 +935,8 @@ static int tcp_send_to_tap(struct ctx *c, struct tcp_tap_conn *conn,
memcpy(data, in, len);
tap_ip_send(c, &conn->a.a6, IPPROTO_TCP, buf, th->doff * 4 + len);
tap_ip_send(c, &conn->a.a6, IPPROTO_TCP, buf, th->doff * 4 + len,
conn->seq_init_to_tap);
return 0;
}
@ -1116,6 +1118,7 @@ static void tcp_conn_from_tap(struct ctx *c, int af, void *addr,
conn->seq_ack_to_tap = conn->seq_from_tap;
conn->seq_to_tap = tcp_seq_init(c, af, addr, th->dest, th->source, now);
conn->seq_init_to_tap = conn->seq_to_tap;
conn->seq_ack_from_tap = conn->seq_to_tap + 1;
tcp_hash_insert(c, conn, af, addr);
@ -1828,6 +1831,7 @@ static void tcp_conn_from_sock(struct ctx *c, union epoll_ref ref,
conn->sock_port,
conn->tap_port,
now);
conn->seq_init_to_tap = conn->seq_to_tap;
tcp_hash_insert(c, conn, AF_INET6, &sa6->sin6_addr);
} else {
@ -1850,6 +1854,7 @@ static void tcp_conn_from_sock(struct ctx *c, union epoll_ref ref,
conn->sock_port,
conn->tap_port,
now);
conn->seq_init_to_tap = conn->seq_to_tap;
tcp_hash_insert(c, conn, AF_INET, &sa4->sin_addr);
}