git: d2e24c54ef83 - stable/13 - nd6: use CARP link level address in SLLAO for NS sent out
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Date: Mon, 07 Feb 2022 18:56:39 UTC
The branch stable/13 has been updated by glebius: URL: https://cgit.FreeBSD.org/src/commit/?id=d2e24c54ef8311a053eddb05a0ce336daf890abb commit d2e24c54ef8311a053eddb05a0ce336daf890abb Author: Thomas Steen Rasmussen <thomas@gibfest.dk> AuthorDate: 2022-01-25 05:02:47 +0000 Commit: Gleb Smirnoff <glebius@FreeBSD.org> CommitDate: 2022-02-07 18:55:54 +0000 nd6: use CARP link level address in SLLAO for NS sent out When sending an NS, check if we are using a IPv6 CARP address and if we do, then put proper CARP link level address into ND_OPT_SOURCE_LINKADDR option and also put PACKET_TAG_CARP tag on the packet. The latter will enforce CARP link level address at the data link layer too, which might be necessary for broken implementations. The code really follows what NA sending code has been doing since introduction of carp(4). While here, bring to style(9) the whole block of code. PR: 193280 Differential revision: https://reviews.freebsd.org/D33858 (cherry picked from commit bc6abdd97e951b54294d331698317a607246255d) --- sys/netinet6/nd6_nbr.c | 38 ++++++++++++++++++++++++-------------- 1 file changed, 24 insertions(+), 14 deletions(-) diff --git a/sys/netinet6/nd6_nbr.c b/sys/netinet6/nd6_nbr.c index 2100700733ad..0c6dd9e0361f 100644 --- a/sys/netinet6/nd6_nbr.c +++ b/sys/netinet6/nd6_nbr.c @@ -411,7 +411,6 @@ nd6_ns_output_fib(struct ifnet *ifp, const struct in6_addr *saddr6, struct ip6_moptions im6o; int icmp6len; int maxlen; - caddr_t mac; NET_EPOCH_ASSERT(); @@ -534,19 +533,30 @@ nd6_ns_output_fib(struct ifnet *ifp, const struct in6_addr *saddr6, * Multicast NS MUST add one add the option * Unicast NS SHOULD add one add the option */ - if (nonce == NULL && (mac = nd6_ifptomac(ifp))) { - int optlen = sizeof(struct nd_opt_hdr) + ifp->if_addrlen; - struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)(nd_ns + 1); - /* 8 byte alignments... */ - optlen = (optlen + 7) & ~7; - - m->m_pkthdr.len += optlen; - m->m_len += optlen; - icmp6len += optlen; - bzero((caddr_t)nd_opt, optlen); - nd_opt->nd_opt_type = ND_OPT_SOURCE_LINKADDR; - nd_opt->nd_opt_len = optlen >> 3; - bcopy(mac, (caddr_t)(nd_opt + 1), ifp->if_addrlen); + if (nonce == NULL) { + struct nd_opt_hdr *nd_opt; + char *mac; + int optlen; + + mac = NULL; + if (ifp->if_carp) + mac = (*carp_macmatch6_p)(ifp, m, &ip6->ip6_src); + if (mac == NULL) + mac = nd6_ifptomac(ifp); + + if (mac != NULL) { + nd_opt = (struct nd_opt_hdr *)(nd_ns + 1); + optlen = sizeof(struct nd_opt_hdr) + ifp->if_addrlen; + /* 8 byte alignments... */ + optlen = (optlen + 7) & ~7; + m->m_pkthdr.len += optlen; + m->m_len += optlen; + icmp6len += optlen; + bzero(nd_opt, optlen); + nd_opt->nd_opt_type = ND_OPT_SOURCE_LINKADDR; + nd_opt->nd_opt_len = optlen >> 3; + bcopy(mac, nd_opt + 1, ifp->if_addrlen); + } } /* * Add a Nonce option (RFC 3971) to detect looped back NS messages.