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udp: Rework udp_listen_sock_data() into udp_sock_fwd()

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udp_listen_sock_data() forwards datagrams from a "listening" socket until
there are no more (for now).  We have an upcoming use case where we want
to do that for a socket that's not a "listening" socket, and uses a
different epoll reference.  So, adjust the function to take the pieces it
needs from the reference as direct parameters and rename to udp_sock_fwd().

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
This commit is contained in:
David Gibson 2025-04-04 21:15:40 +11:00 • committed by Stefano Brivio
parent 159beefa36
commit bd6a41ee76
1 changed files with 14 additions and 15 deletions

29
udp.c
View file

@ -716,37 +716,36 @@ static void udp_buf_sock_to_tap(const struct ctx *c, int s, int n,
}
/**
* udp_listen_sock_data() - Handle new data from listening socket
* udp_sock_fwd() - Forward datagrams from a possibly unconnected socket
* @c: Execution context
* @ref: epoll reference
* @s: Socket to forward from
* @frompif: Interface to which @s belongs
* @port: Our (local) port number of @s
* @now: Current timestamp
*/
static void udp_listen_sock_data(const struct ctx *c, union epoll_ref ref,
const struct timespec *now)
static void udp_sock_fwd(const struct ctx *c, int s, uint8_t frompif,
in_port_t port, const struct timespec *now)
{
union sockaddr_inany src;
while (udp_peek_addr(ref.fd, &src) == 0) {
flow_sidx_t tosidx = udp_flow_from_sock(c, ref.udp.pif,
ref.udp.port, &src,
now);
while (udp_peek_addr(s, &src) == 0) {
flow_sidx_t tosidx = udp_flow_from_sock(c, frompif, port,
&src, now);
uint8_t topif = pif_at_sidx(tosidx);
if (pif_is_socket(topif)) {
udp_sock_to_sock(c, ref.fd, 1, tosidx);
udp_sock_to_sock(c, s, 1, tosidx);
} else if (topif == PIF_TAP) {
if (c->mode == MODE_VU)
udp_vu_sock_to_tap(c, ref.fd, 1, tosidx);
udp_vu_sock_to_tap(c, s, 1, tosidx);
else
udp_buf_sock_to_tap(c, ref.fd, 1, tosidx);
udp_buf_sock_to_tap(c, s, 1, tosidx);
} else if (flow_sidx_valid(tosidx)) {
flow_sidx_t fromsidx = flow_sidx_opposite(tosidx);
struct udp_flow *uflow = udp_at_sidx(tosidx);
flow_err(uflow,
"No support for forwarding UDP from %s to %s",
pif_name(pif_at_sidx(fromsidx)),
pif_name(topif));
pif_name(frompif), pif_name(topif));
} else {
debug("Discarding datagram without flow");
}
@ -774,7 +773,7 @@ void udp_listen_sock_handler(const struct ctx *c,
}
if (events & EPOLLIN)
udp_listen_sock_data(c, ref, now);
udp_sock_fwd(c, ref.fd, ref.udp.pif, ref.udp.port, now);
}
/**