Date: Mon, 20 Feb 2023 14:30:21 GMT From: "Alexander V. Chernikov" <melifaro@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-main@FreeBSD.org Subject: git: c7c348162101 - main - netlink: fix IPv6 route addition with link-local gateway Message-ID: <202302201430.31KEUL0E000503@gitrepo.freebsd.org>
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The branch main has been updated by melifaro: URL: https://cgit.FreeBSD.org/src/commit/?id=c7c348162101a70b1f99299578dabe1d3b100e48 commit c7c348162101a70b1f99299578dabe1d3b100e48 Author: Alexander V. Chernikov <melifaro@FreeBSD.org> AuthorDate: 2023-02-20 14:24:01 +0000 Commit: Alexander V. Chernikov <melifaro@FreeBSD.org> CommitDate: 2023-02-20 14:29:48 +0000 netlink: fix IPv6 route addition with link-local gateway Currently kernel assumes that IPv6 gateway address is in "embedded" form - that is, for the link-local IPv6 addresses, interface index is embedded in bytes 2 and 3 of the address. Fix address embedding in netlink by wrapping nhop_set_gw() in the netlink-specific nl_set_nexthop_gw(), which does such embedding automatically. Reported by: Marek Zarychta <zarychtam@plan-b.pwste.edu.pl> MFC after: 3 days --- sys/netlink/route/nexthop.c | 42 ++++++++++++++++++++++++++++++++++++------ sys/netlink/route/route_var.h | 2 ++ sys/netlink/route/rt.c | 15 ++++++++++++--- 3 files changed, 50 insertions(+), 9 deletions(-) diff --git a/sys/netlink/route/nexthop.c b/sys/netlink/route/nexthop.c index e9f008842644..63e491687249 100644 --- a/sys/netlink/route/nexthop.c +++ b/sys/netlink/route/nexthop.c @@ -741,8 +741,34 @@ newnhg(struct unhop_ctl *ctl, struct nl_parsed_nhop *attrs, struct user_nhop *un return (0); } +/* + * Sets nexthop @nh gateway specified by @gw. + * If gateway is IPv6 link-local, alters @gw to include scopeid equal to + * @ifp ifindex. + * Returns 0 on success or errno. + */ +int +nl_set_nexthop_gw(struct nhop_object *nh, struct sockaddr *gw, struct ifnet *ifp, + struct nl_pstate *npt) +{ +#ifdef INET6 + if (gw->sa_family == AF_INET6) { + struct sockaddr_in6 *gw6 = (struct sockaddr_in6 *)gw; + if (IN6_IS_ADDR_LINKLOCAL(&gw6->sin6_addr)) { + if (ifp == NULL) { + NLMSG_REPORT_ERR_MSG(npt, "interface not set"); + return (EINVAL); + } + in6_set_unicast_scopeid(&gw6->sin6_addr, ifp->if_index); + } + } +#endif + nhop_set_gw(nh, gw, true); + return (0); +} + static int -newnhop(struct nl_parsed_nhop *attrs, struct user_nhop *unhop) +newnhop(struct nl_parsed_nhop *attrs, struct user_nhop *unhop, struct nl_pstate *npt) { struct ifaddr *ifa = NULL; struct nhop_object *nh; @@ -750,17 +776,17 @@ newnhop(struct nl_parsed_nhop *attrs, struct user_nhop *unhop) if (!attrs->nha_blackhole) { if (attrs->nha_gw == NULL) { - NL_LOG(LOG_DEBUG, "missing NHA_GATEWAY"); + NLMSG_REPORT_ERR_MSG(npt, "missing NHA_GATEWAY"); return (EINVAL); } if (attrs->nha_oif == NULL) { - NL_LOG(LOG_DEBUG, "missing NHA_OIF"); + NLMSG_REPORT_ERR_MSG(npt, "missing NHA_OIF"); return (EINVAL); } if (ifa == NULL) ifa = ifaof_ifpforaddr(attrs->nha_gw, attrs->nha_oif); if (ifa == NULL) { - NL_LOG(LOG_DEBUG, "Unable to determine default source IP"); + NLMSG_REPORT_ERR_MSG(npt, "Unable to determine default source IP"); return (EINVAL); } } @@ -777,7 +803,11 @@ newnhop(struct nl_parsed_nhop *attrs, struct user_nhop *unhop) if (attrs->nha_blackhole) nhop_set_blackhole(nh, NHF_BLACKHOLE); else { - nhop_set_gw(nh, attrs->nha_gw, true); + error = nl_set_nexthop_gw(nh, attrs->nha_gw, attrs->nha_oif, npt); + if (error != 0) { + nhop_free(nh); + return (error); + } nhop_set_transmit_ifp(nh, attrs->nha_oif); nhop_set_src(nh, ifa); } @@ -839,7 +869,7 @@ rtnl_handle_newnhop(struct nlmsghdr *hdr, struct nlpcb *nlp, if (attrs.nha_group) error = newnhg(ctl, &attrs, unhop); else - error = newnhop(&attrs, unhop); + error = newnhop(&attrs, unhop, npt); if (error != 0) { free(unhop, M_NETLINK); diff --git a/sys/netlink/route/route_var.h b/sys/netlink/route/route_var.h index f1e522c7ae05..f3b1d7d929a5 100644 --- a/sys/netlink/route/route_var.h +++ b/sys/netlink/route/route_var.h @@ -104,6 +104,8 @@ void rtnl_iface_drivers_register(void); void rtnl_nexthops_init(void); struct nhop_object *nl_find_nhop(uint32_t fibnum, int family, uint32_t uidx, int nh_flags, int *perror); +int nl_set_nexthop_gw(struct nhop_object *nh, struct sockaddr *gw, + struct ifnet *ifp, struct nl_pstate *npt); #endif diff --git a/sys/netlink/route/rt.c b/sys/netlink/route/rt.c index aca69e75fea8..534186447b4d 100644 --- a/sys/netlink/route/rt.c +++ b/sys/netlink/route/rt.c @@ -736,7 +736,11 @@ create_nexthop_one(struct nl_parsed_route *attrs, struct rta_mpath_nh *mpnh, if (nh == NULL) return (ENOMEM); - nhop_set_gw(nh, mpnh->gw, true); + error = nl_set_nexthop_gw(nh, mpnh->gw, mpnh->ifp, npt); + if (error != 0) { + nhop_free(nh); + return (error); + } if (mpnh->ifp != NULL) nhop_set_transmit_ifp(nh, mpnh->ifp); nhop_set_rtflags(nh, attrs->rta_rtflags); @@ -800,8 +804,13 @@ create_nexthop_from_attrs(struct nl_parsed_route *attrs, *perror = ENOMEM; return (NULL); } - if (attrs->rta_gw != NULL) - nhop_set_gw(nh, attrs->rta_gw, true); + if (attrs->rta_gw != NULL) { + *perror = nl_set_nexthop_gw(nh, attrs->rta_gw, attrs->rta_oif, npt); + if (*perror != 0) { + nhop_free(nh); + return (NULL); + } + } if (attrs->rta_oif != NULL) nhop_set_transmit_ifp(nh, attrs->rta_oif); if (attrs->rtax_mtu != 0)
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