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conf, tcp, udp: Allow address specification for forwarded ports

Browse source 
This feature is available in slirp4netns but was missing in passt and
pasta.

Given that we don't do dynamic memory allocation, we need to bind
sockets while parsing port configuration. This means we need to
process all other options first, as they might affect addressing and
IP version support. It also implies a minor rework of how TCP and UDP
implementations bind sockets.

Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
This commit is contained in:
Stefano Brivio 2022-05-01 06:36:34 +02:00
parent df69be379e
commit 3c6ae62510
10 changed files with 274 additions and 156 deletions

22
passt.c
View file

@ -370,20 +370,13 @@ int main(int argc, char **argv)
__setlogmask(LOG_MASK(LOG_EMERG));
conf(&c, argc, argv);
trace_init(c.trace);
if (!c.debug && (c.stderr || isatty(fileno(stdout))))
__openlog(log_name, LOG_PERROR, LOG_DAEMON);
c.epollfd = epoll_create1(c.foreground ? O_CLOEXEC : 0);
/* NOLINTNEXTLINE(android-cloexec-epoll-create1): forking in a moment */
c.epollfd = epoll_create1(0);
if (c.epollfd == -1) {
perror("epoll_create1");
exit(EXIT_FAILURE);
}
quit_fd = pasta_netns_quit_init(&c);
if (getrlimit(RLIMIT_NOFILE, &limit)) {
perror("getrlimit");
exit(EXIT_FAILURE);
@ -395,13 +388,20 @@ int main(int argc, char **argv)
}
sock_probe_mem(&c);
conf(&c, argc, argv);
trace_init(c.trace);
if (!c.debug && (c.stderr || isatty(fileno(stdout))))
__openlog(log_name, LOG_PERROR, LOG_DAEMON);
quit_fd = pasta_netns_quit_init(&c);
c.fd_tap = c.fd_tap_listen = -1;
tap_sock_init(&c);
clock_gettime(CLOCK_MONOTONIC, &now);
if ((!c.no_udp && udp_sock_init(&c)) ||
(!c.no_tcp && tcp_sock_init(&c)))
if ((!c.no_udp && udp_init(&c)) || (!c.no_tcp && tcp_init(&c)))
exit(EXIT_FAILURE);
proto_update_l2_buf(c.mac_guest, c.mac, &c.addr4);