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udp: Remove socket from udp_{tap,splice}_map when timed out

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We save sockets bound to particular ports in udp_{tap,splice}_map for
reuse later.  If they're not used for a time, we time them out and close
them. However, when that happened, we weren't actually removing the fds
from the relevant map.  That meant that later interactions on the same port
could get a stale fd from the map.

The stale fd might be closed, leading to unexpected EBADF errors, or it
could have been re-used by a completely different socket bound to a
different port, which could lead to us incorrectly forwarding packets.

Reported-by: Chris Kuhn <kuhnchris@kuhnchris.eu>
Reported-by: Jay <bugs.passt.top@bitsbetwixt.com>
Link: https://bugs.passt.top/show_bug.cgi?id=57
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 2023-11-06 13:17:09 +11:00 committed by Stefano Brivio
parent 480aa4a108
commit de974f0cf1
1 changed files with 7 additions and 5 deletions
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12
udp.c
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@ -1147,14 +1147,14 @@ static void udp_timer_one(struct ctx *c, int v6, enum udp_act_type type,
{
struct udp_splice_port *sp;
struct udp_tap_port *tp;
int s = -1;
int *sockp = NULL;
switch (type) {
case UDP_ACT_TAP:
tp = &udp_tap_map[v6 ? V6 : V4][port];
if (ts->tv_sec - tp->ts > UDP_CONN_TIMEOUT) {
s = tp->sock;
sockp = &tp->sock;
tp->flags = 0;
}
@ -1163,21 +1163,23 @@ static void udp_timer_one(struct ctx *c, int v6, enum udp_act_type type,
sp = &udp_splice_init[v6 ? V6 : V4][port];
if (ts->tv_sec - sp->ts > UDP_CONN_TIMEOUT)
s = sp->sock;
sockp = &sp->sock;
break;
case UDP_ACT_SPLICE_NS:
sp = &udp_splice_ns[v6 ? V6 : V4][port];
if (ts->tv_sec - sp->ts > UDP_CONN_TIMEOUT)
s = sp->sock;
sockp = &sp->sock;
break;
default:
return;
}
if (s >= 0) {
if (sockp && *sockp >= 0) {
int s = *sockp;
*sockp = -1;
epoll_ctl(c->epollfd, EPOLL_CTL_DEL, s, NULL);
close(s);
bitmap_clear(udp_act[v6 ? V6 : V4][type], port);