d/freebsd-dev
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

netinet: allow UDP tunnels to be removed

Browse Source 
udp_set_kernel_tunneling() rejects new callbacks if one is already set.
Allow callbacks to be cleared. The use case for this is OpenVPN DCO,
where the socket is opened by userspace and then adopted by the kernel
to run the tunnel. If the DCO interface is removed but userspace does
not close the socket (something the kernel cannot prevent) the installed
callbacks could be called with an invalidated context.

Allow new functions to be set, but only if they're NULL (i.e. allow the
callback functions to be cleared).

Reviewed by:	tuexen
MFC after:	3 weeks
Sponsored by:	Rubicon Communications, LLC ("Netgate")
Differential Revision:	https://reviews.freebsd.org/D34288
This commit is contained in:
Kristof Provost 2022-02-15 11:49:39 +01:00
parent c4f52f71de
commit 995cba5a0c
1 changed files with 2 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
sys/netinet/udp_usrreq.c
View File

@ -1555,8 +1555,8 @@ udp_set_kernel_tunneling(struct socket *so, udp_tun_func_t f, udp_tun_icmp_t i,
KASSERT(inp != NULL, ("udp_set_kernel_tunneling: inp == NULL"));
INP_WLOCK(inp);
up = intoudpcb(inp);
if ((up->u_tun_func != NULL) ||
(up->u_icmp_func != NULL)) {
if ((f != NULL || i != NULL) && ((up->u_tun_func != NULL) ||
(up->u_icmp_func != NULL))) {
INP_WUNLOCK(inp);
return (EBUSY);
}