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tcp, udp: Split IPv4 and IPv6 bound port sets

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Allow to bind IPv4 and IPv6 ports to tap, namespace or init separately.

Port numbers of TCP ports that are bound in a namespace are also bound
for UDP for convenience (e.g. iperf3), and IPv4 ports are always bound
if the corresponding IPv6 port is bound (socket might not have the
IPV6_V6ONLY option set). This will also be configurable later.

Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
This commit is contained in:
Stefano Brivio 2021-07-21 17:44:39 +02:00
parent b508079c4c
commit 49631a38a6
5 changed files with 131 additions and 79 deletions

61
tcp.c
View file

@ -1770,7 +1770,8 @@ static int tcp_splice_new(struct ctx *c, struct tcp_splice_conn *conn,
struct tcp_splice_connect_ns_arg ns_arg = { c, conn, v6, port, 0 };
char ns_fn_stack[NS_FN_STACK_SIZE];
if (bitmap_isset(c->tcp.port_to_ns, port)) {
if ((!v6 && bitmap_isset(c->tcp.port4_to_ns, port)) ||
(v6 && bitmap_isset(c->tcp.port6_to_ns, port))) {
clone(tcp_splice_connect_ns,
ns_fn_stack + sizeof(ns_fn_stack) / 2,
CLONE_VM | CLONE_VFORK | CLONE_FILES | SIGCHLD,
@ -2082,19 +2083,24 @@ static int tcp_sock_init_ns(void *arg)
ns_enter(c->pasta_pid);
for (port = 0; !PORT_IS_EPHEMERAL(port); port++) {
if (!bitmap_isset(c->tcp.port_to_init, port))
continue;
if (c->v4) {
tref.v6 = 0;
for (port = 0; port < USHRT_MAX; port++) {
if (!bitmap_isset(c->tcp.port4_to_init, port))
continue;
tref.index = port;
if (c->v4) {
tref.v6 = 0;
tref.index = port;
sock_l4(c, AF_INET, IPPROTO_TCP, port, 1, tref.u32);
}
}
if (c->v6) {
tref.v6 = 1;
if (c->v6) {
tref.v6 = 1;
for (port = 0; port < USHRT_MAX; port++) {
if (!bitmap_isset(c->tcp.port6_to_init, port))
continue;
tref.index = port;
sock_l4(c, AF_INET6, IPPROTO_TCP, port, 1, tref.u32);
}
}
@ -2116,24 +2122,33 @@ int tcp_sock_init(struct ctx *c)
getrandom(&c->tcp.hash_secret, sizeof(c->tcp.hash_secret), GRND_RANDOM);
for (port = 0; !PORT_IS_EPHEMERAL(port); port++) {
if (bitmap_isset(c->tcp.port_to_ns, port))
tref.splice = 1;
else if (bitmap_isset(c->tcp.port_to_tap, port))
tref.splice = 0;
else
continue;
if (c->v4) {
tref.v6 = 0;
for (port = 0; port < USHRT_MAX; port++) {
if (bitmap_isset(c->tcp.port4_to_ns, port))
tref.splice = 1;
else if (bitmap_isset(c->tcp.port4_to_tap, port))
tref.splice = 0;
else
continue;
tref.index = port;
if (c->v4) {
tref.v6 = 0;
tref.index = port;
sock_l4(c, AF_INET, IPPROTO_TCP, port, tref.splice,
tref.u32);
}
}
if (c->v6) {
tref.v6 = 1;
if (c->v6) {
tref.v6 = 1;
for (port = 0; port < USHRT_MAX; port++) {
if (bitmap_isset(c->tcp.port6_to_ns, port))
tref.splice = 1;
else if (bitmap_isset(c->tcp.port6_to_tap, port))
tref.splice = 0;
else
continue;
tref.index = port;
sock_l4(c, AF_INET6, IPPROTO_TCP, port, tref.splice,
tref.u32);
}