Date: Wed, 10 Jan 2024 18:44:37 GMT From: Ed Maste <emaste@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-branches@FreeBSD.org Subject: git: 3159e314f194 - stable/14 - Fix udp IPv4-mapped address Message-ID: <202401101844.40AIibCk093670@gitrepo.freebsd.org>
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The branch stable/14 has been updated by emaste: URL: https://cgit.FreeBSD.org/src/commit/?id=3159e314f194bd8db98dd4516f46350b2fbe44f0 commit 3159e314f194bd8db98dd4516f46350b2fbe44f0 Author: Richard Kümmel <R.Kuemmel@beckhoff.com> AuthorDate: 2023-12-15 11:49:45 +0000 Commit: Ed Maste <emaste@FreeBSD.org> CommitDate: 2024-01-10 16:37:44 +0000 Fix udp IPv4-mapped address Do not use the cached route if the destination isn't the same. This fix a problem where an UDP packet will be sent via the wrong route and interface if a previous one was sent via them. PR: 275774 Reviewed by: glebius, tuexen Sponsored by: Beckhoff Automation GmbH & Co. KG (cherry picked from commit 7df9da47e8f04267330e1baa751f07c0c4aaf2ac) --- sys/netinet/udp_usrreq.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/sys/netinet/udp_usrreq.c b/sys/netinet/udp_usrreq.c index 708a4e6b730d..75dec9d5f5aa 100644 --- a/sys/netinet/udp_usrreq.c +++ b/sys/netinet/udp_usrreq.c @@ -1055,6 +1055,7 @@ udp_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr, uint16_t cscov = 0; uint32_t flowid = 0; uint8_t flowtype = M_HASHTYPE_NONE; + bool use_cached_route; inp = sotoinpcb(so); KASSERT(inp != NULL, ("udp_send: inp == NULL")); @@ -1091,9 +1092,8 @@ udp_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr, * We will need network epoch in either case, to safely lookup into * pcb hash. */ - if (sin == NULL || - (inp->inp_laddr.s_addr == INADDR_ANY && inp->inp_lport == 0) || - (flags & PRUS_IPV6) != 0) + use_cached_route = sin == NULL || (inp->inp_laddr.s_addr == INADDR_ANY && inp->inp_lport == 0); + if (use_cached_route || (flags & PRUS_IPV6) != 0) INP_WLOCK(inp); else INP_RLOCK(inp); @@ -1443,7 +1443,7 @@ udp_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr, else UDP_PROBE(send, NULL, inp, &ui->ui_i, inp, &ui->ui_u); error = ip_output(m, inp->inp_options, - INP_WLOCKED(inp) ? &inp->inp_route : NULL, ipflags, + use_cached_route ? &inp->inp_route : NULL, ipflags, inp->inp_moptions, inp); INP_UNLOCK(inp); NET_EPOCH_EXIT(et);
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