Date: Fri, 07 Nov 2025 18:39:20 +0000 From: bugzilla-noreply@freebsd.org To: net@FreeBSD.org Subject: [Bug 290768] if_wg(4): handshake response has src and dst reverse Message-ID: <bug-290768-7501-QxYiO1VToM@https.bugs.freebsd.org/bugzilla/> In-Reply-To: <bug-290768-7501@https.bugs.freebsd.org/bugzilla/> References: <bug-290768-7501@https.bugs.freebsd.org/bugzilla/>
next in thread | previous in thread | raw e-mail | index | archive | help
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=290768 Kyle Evans <kevans@freebsd.org> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |glebius@FreeBSD.org, | |kevans@freebsd.org --- Comment #4 from Kyle Evans <kevans@freebsd.org> --- What's unclear is where CARP might be breaking an assumption that wg(4) is making. The source address is set with IP_SENDSRCADDR using udp_in[1] that we got via udp_input() -> udp_append() -> tunnel func -- is that address wrong, or is it getting dorked up on udp_send()? Actually, I'm kind of eyeballing this commit[0] by glebius and wondering if it's still a problem in 15.0 / main. The wg(4) socket has previously been sobind() to 0.0.0.0:<port>, which presumably takes us into this branch: if (inp->inp_laddr.s_addr == INADDR_ANY || inp->inp_lport == 0 || sin->sin_addr.s_addr == INADDR_ANY || sin->sin_addr.s_addr == INADDR_BROADCAST) { So we call in_pcbconnect_setup(), which at a minimum probably clobbers our specified src address in laddr.s_addr. I don't know where CARP comes in or if this ends up somehow clobbering in this precise way, but finding a way to test this on main or stable/15 would be a good start towards working on a resolution -- at the very least, if udp_send() wasn't wreaking some havoc there, we can try a custom kernel with more diagnostics to figure out if it's messing up on the way *in* to if_wg(4) or on the way out. [0] https://cgit.freebsd.org/src/commit/?id=69c05f42871406b4b2b2dac00a268d1da0cacd3e -- You are receiving this mail because: You are the assignee for the bug.
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?bug-290768-7501-QxYiO1VToM>