// SPDX-License-Identifier: GPL-2.0-or-later /* * Address linked list routine. * Copyright (C) 1997, 98 Kunihiro Ishiguro */ #include #include "prefix.h" #include "linklist.h" #include "if.h" #include "table.h" #include "rib.h" #include "table.h" #include "log.h" #include "memory.h" #include "vty.h" #include "zebra/debug.h" #include "zebra/zserv.h" #include "zebra/redistribute.h" #include "zebra/interface.h" #include "zebra/connected.h" #include "zebra/rtadv.h" #include "zebra/zebra_mpls.h" #include "zebra/zebra_errors.h" #include "zebra/zebra_router.h" /* communicate the withdrawal of a connected address */ static void connected_withdraw(struct connected *ifc) { if (!ifc) return; /* Update interface address information to protocol daemon. */ if (CHECK_FLAG(ifc->conf, ZEBRA_IFC_REAL)) { zebra_interface_address_delete_update(ifc->ifp, ifc); if (ifc->address->family == AF_INET) if_subnet_delete(ifc->ifp, ifc); connected_down(ifc->ifp, ifc); UNSET_FLAG(ifc->conf, ZEBRA_IFC_REAL); } /* The address is not in the kernel anymore, so clear the flag */ UNSET_FLAG(ifc->conf, ZEBRA_IFC_QUEUED); if (!CHECK_FLAG(ifc->conf, ZEBRA_IFC_CONFIGURED)) { listnode_delete(ifc->ifp->connected, ifc); connected_free(&ifc); } } static void connected_announce(struct interface *ifp, struct connected *ifc) { if (!ifc) return; if (!if_is_loopback(ifp) && ifc->address->family == AF_INET) { if (ifc->address->prefixlen == IPV4_MAX_BITLEN) SET_FLAG(ifc->flags, ZEBRA_IFA_UNNUMBERED); else UNSET_FLAG(ifc->flags, ZEBRA_IFA_UNNUMBERED); } listnode_add(ifp->connected, ifc); /* Update interface address information to protocol daemon. */ if (ifc->address->family == AF_INET) if_subnet_add(ifp, ifc); zebra_interface_address_add_update(ifp, ifc); if (if_is_operative(ifp)) { connected_up(ifp, ifc); } } /* If same interface address is already exist... */ struct connected *connected_check(struct interface *ifp, union prefixconstptr pu) { const struct prefix *p = pu.p; struct connected *ifc; struct listnode *node; for (ALL_LIST_ELEMENTS_RO(ifp->connected, node, ifc)) if (prefix_same(ifc->address, p)) return ifc; return NULL; } /* same, but with peer address */ struct connected *connected_check_ptp(struct interface *ifp, union prefixconstptr pu, union prefixconstptr du) { const struct prefix *p = pu.p; const struct prefix *d = du.p; struct connected *ifc; struct listnode *node; for (ALL_LIST_ELEMENTS_RO(ifp->connected, node, ifc)) { if (!prefix_same(ifc->address, p)) continue; if (!CONNECTED_PEER(ifc) && !d) return ifc; if (CONNECTED_PEER(ifc) && d && prefix_same(ifc->destination, d)) return ifc; } return NULL; } /* Check if two ifc's describe the same address in the same state */ static int connected_same(struct connected *ifc1, struct connected *ifc2) { if (ifc1->ifp != ifc2->ifp) return 0; if (ifc1->flags != ifc2->flags) return 0; if (ifc1->conf != ifc2->conf) return 0; if (ifc1->destination) if (!ifc2->destination) return 0; if (ifc2->destination) if (!ifc1->destination) return 0; if (ifc1->destination && ifc2->destination) if (!prefix_same(ifc1->destination, ifc2->destination)) return 0; return 1; } /* Handle changes to addresses and send the neccesary announcements * to clients. */ static void connected_update(struct interface *ifp, struct connected *ifc) { struct connected *current; /* Check same connected route. */ current = connected_check_ptp(ifp, ifc->address, ifc->destination); if (current) { if (CHECK_FLAG(current->conf, ZEBRA_IFC_CONFIGURED)) SET_FLAG(ifc->conf, ZEBRA_IFC_CONFIGURED); /* Avoid spurious withdraws, this might be just the kernel * 'reflecting' * back an address we have already added. */ if (connected_same(current, ifc)) { /* nothing to do */ connected_free(&ifc); return; } /* Clear the configured flag on the old ifc, so it will be freed * by * connected withdraw. */ UNSET_FLAG(current->conf, ZEBRA_IFC_CONFIGURED); connected_withdraw( current); /* implicit withdraw - freebsd does this */ } /* If the connected is new or has changed, announce it, if it is usable */ if (CHECK_FLAG(ifc->conf, ZEBRA_IFC_REAL)) connected_announce(ifp, ifc); } /* Called from if_up(). */ void connected_up(struct interface *ifp, struct connected *ifc) { afi_t afi; struct prefix p; struct nexthop nh = { .type = NEXTHOP_TYPE_IFINDEX, .ifindex = ifp->ifindex, .vrf_id = ifp->vrf->vrf_id, }; struct zebra_vrf *zvrf; uint32_t metric; uint32_t flags = 0; uint32_t count = 0; struct listnode *cnode; struct connected *c; zvrf = ifp->vrf->info; if (!zvrf) { flog_err( EC_ZEBRA_VRF_NOT_FOUND, "%s: Received Up for interface but no associated zvrf: %s(%d)", __func__, ifp->vrf->name, ifp->vrf->vrf_id); return; } if (!CHECK_FLAG(ifc->conf, ZEBRA_IFC_REAL)) return; /* Ensure 'down' flag is cleared */ UNSET_FLAG(ifc->conf, ZEBRA_IFC_DOWN); prefix_copy(&p, CONNECTED_PREFIX(ifc)); /* Apply mask to the network. */ apply_mask(&p); afi = family2afi(p.family); switch (afi) { case AFI_IP: /* * In case of connected address is 0.0.0.0/0 we treat it tunnel * address. */ if (prefix_ipv4_any((struct prefix_ipv4 *)&p)) return; break; case AFI_IP6: #ifndef GNU_LINUX /* XXX: It is already done by rib_bogus_ipv6 within rib_add */ if (IN6_IS_ADDR_UNSPECIFIED(&p.u.prefix6)) return; #endif break; case AFI_UNSPEC: case AFI_L2VPN: case AFI_MAX: flog_warn(EC_ZEBRA_CONNECTED_AFI_UNKNOWN, "Received unknown AFI: %s", afi2str(afi)); return; break; } metric = (ifc->metric < (uint32_t)METRIC_MAX) ? ifc->metric : ifp->metric; /* * Since we are hand creating the connected routes * in our main routing table, *if* we are working * in an offloaded environment then we need to * pretend like the route is offloaded so everything * else will work */ if (zrouter.asic_offloaded) flags |= ZEBRA_FLAG_OFFLOADED; /* * It's possible to add the same network and mask * to an interface over and over. This would * result in an equivalent number of connected * routes. Just add one connected route in * for all the addresses on an interface that * resolve to the same network and mask */ for (ALL_LIST_ELEMENTS_RO(ifp->connected, cnode, c)) { struct prefix cp; prefix_copy(&cp, CONNECTED_PREFIX(c)); apply_mask(&cp); if (prefix_same(&cp, &p) && !CHECK_FLAG(c->conf, ZEBRA_IFC_DOWN)) count++; if (count >= 2) return; } rib_add(afi, SAFI_UNICAST, zvrf->vrf->vrf_id, ZEBRA_ROUTE_CONNECT, 0, flags, &p, NULL, &nh, 0, zvrf->table_id, metric, 0, 0, 0, false); rib_add(afi, SAFI_MULTICAST, zvrf->vrf->vrf_id, ZEBRA_ROUTE_CONNECT, 0, flags, &p, NULL, &nh, 0, zvrf->table_id, metric, 0, 0, 0, false); /* Schedule LSP forwarding entries for processing, if appropriate. */ if (zvrf->vrf->vrf_id == VRF_DEFAULT) { if (IS_ZEBRA_DEBUG_MPLS) zlog_debug( "%u: IF %s IP %pFX address add/up, scheduling MPLS processing", zvrf->vrf->vrf_id, ifp->name, &p); mpls_mark_lsps_for_processing(zvrf, &p); } } /* Add connected IPv4 route to the interface. */ void connected_add_ipv4(struct interface *ifp, int flags, const struct in_addr *addr, uint16_t prefixlen, const struct in_addr *dest, const char *label, uint32_t metric) { struct prefix_ipv4 *p; struct connected *ifc; if (ipv4_martian(addr)) return; /* Make connected structure. */ ifc = connected_new(); ifc->ifp = ifp; ifc->flags = flags; ifc->metric = metric; /* If we get a notification from the kernel, * we can safely assume the address is known to the kernel */ SET_FLAG(ifc->conf, ZEBRA_IFC_QUEUED); if (!if_is_operative(ifp)) SET_FLAG(ifc->conf, ZEBRA_IFC_DOWN); /* Allocate new connected address. */ p = prefix_ipv4_new(); p->family = AF_INET; p->prefix = *addr; p->prefixlen = CHECK_FLAG(flags, ZEBRA_IFA_PEER) ? IPV4_MAX_BITLEN : prefixlen; ifc->address = (struct prefix *)p; /* If there is a peer address. */ if (CONNECTED_PEER(ifc)) { /* validate the destination address */ if (dest) { p = prefix_ipv4_new(); p->family = AF_INET; p->prefix = *dest; p->prefixlen = prefixlen; ifc->destination = (struct prefix *)p; if (IPV4_ADDR_SAME(addr, dest)) flog_warn( EC_ZEBRA_IFACE_SAME_LOCAL_AS_PEER, "interface %s has same local and peer address %pI4, routing protocols may malfunction", ifp->name, addr); } else { zlog_debug( "%s called for interface %s with peer flag set, but no peer address supplied", __func__, ifp->name); UNSET_FLAG(ifc->flags, ZEBRA_IFA_PEER); } } /* no destination address was supplied */ if (!dest && (prefixlen == IPV4_MAX_BITLEN) && if_is_pointopoint(ifp)) zlog_debug( "PtP interface %s with addr %pI4/%d needs a peer address", ifp->name, addr, prefixlen); /* Label of this address. */ if (label) ifc->label = XSTRDUP(MTYPE_CONNECTED_LABEL, label); /* For all that I know an IPv4 address is always ready when we receive * the notification. So it should be safe to set the REAL flag here. */ SET_FLAG(ifc->conf, ZEBRA_IFC_REAL); connected_update(ifp, ifc); } void connected_down(struct interface *ifp, struct connected *ifc) { afi_t afi; struct prefix p; struct nexthop nh = { .type = NEXTHOP_TYPE_IFINDEX, .ifindex = ifp->ifindex, .vrf_id = ifp->vrf->vrf_id, }; struct zebra_vrf *zvrf; uint32_t count = 0; struct listnode *cnode; struct connected *c; zvrf = ifp->vrf->info; if (!zvrf) { flog_err( EC_ZEBRA_VRF_NOT_FOUND, "%s: Received Down for interface but no associated zvrf: %s(%d)", __func__, ifp->vrf->name, ifp->vrf->vrf_id); return; } if (!CHECK_FLAG(ifc->conf, ZEBRA_IFC_REAL)) return; /* Skip if we've already done this; this can happen if we have a * config change that takes an interface down, then we receive kernel * notifications about the downed interface and its addresses. */ if (CHECK_FLAG(ifc->conf, ZEBRA_IFC_DOWN)) { if (IS_ZEBRA_DEBUG_RIB) zlog_debug("%s: ifc %p, %pFX already DOWN", __func__, ifc, ifc->address); return; } prefix_copy(&p, CONNECTED_PREFIX(ifc)); /* Apply mask to the network. */ apply_mask(&p); afi = family2afi(p.family); switch (afi) { case AFI_IP: /* * In case of connected address is 0.0.0.0/0 we treat it tunnel * address. */ if (prefix_ipv4_any((struct prefix_ipv4 *)&p)) return; break; case AFI_IP6: if (IN6_IS_ADDR_UNSPECIFIED(&p.u.prefix6)) return; break; case AFI_UNSPEC: case AFI_L2VPN: case AFI_MAX: zlog_warn("Unknown AFI: %s", afi2str(afi)); break; } /* Mark the address as 'down' */ SET_FLAG(ifc->conf, ZEBRA_IFC_DOWN); /* * It's possible to have X number of addresses * on a interface that all resolve to the same * network and mask. Find them and just * allow the deletion when are removing the last * one. */ for (ALL_LIST_ELEMENTS_RO(ifp->connected, cnode, c)) { struct prefix cp; prefix_copy(&cp, CONNECTED_PREFIX(c)); apply_mask(&cp); if (prefix_same(&p, &cp) && !CHECK_FLAG(c->conf, ZEBRA_IFC_DOWN)) count++; if (count >= 1) return; } /* * Same logic as for connected_up(): push the changes into the * head. */ rib_delete(afi, SAFI_UNICAST, zvrf->vrf->vrf_id, ZEBRA_ROUTE_CONNECT, 0, 0, &p, NULL, &nh, 0, zvrf->table_id, 0, 0, false); rib_delete(afi, SAFI_MULTICAST, zvrf->vrf->vrf_id, ZEBRA_ROUTE_CONNECT, 0, 0, &p, NULL, &nh, 0, zvrf->table_id, 0, 0, false); /* Schedule LSP forwarding entries for processing, if appropriate. */ if (zvrf->vrf->vrf_id == VRF_DEFAULT) { if (IS_ZEBRA_DEBUG_MPLS) zlog_debug( "%u: IF %s IP %pFX address down, scheduling MPLS processing", zvrf->vrf->vrf_id, ifp->name, &p); mpls_mark_lsps_for_processing(zvrf, &p); } } static void connected_delete_helper(struct connected *ifc, struct prefix *p) { struct interface *ifp; if (!ifc) return; ifp = ifc->ifp; connected_withdraw(ifc); /* Schedule LSP forwarding entries for processing, if appropriate. */ if (ifp->vrf->vrf_id == VRF_DEFAULT) { if (IS_ZEBRA_DEBUG_MPLS) zlog_debug( "%u: IF %s IP %pFX address delete, scheduling MPLS processing", ifp->vrf->vrf_id, ifp->name, p); mpls_mark_lsps_for_processing(ifp->vrf->info, p); } } /* Delete connected IPv4 route to the interface. */ void connected_delete_ipv4(struct interface *ifp, int flags, const struct in_addr *addr, uint16_t prefixlen, const struct in_addr *dest) { struct prefix p, d; struct connected *ifc; memset(&p, 0, sizeof(p)); p.family = AF_INET; p.u.prefix4 = *addr; p.prefixlen = CHECK_FLAG(flags, ZEBRA_IFA_PEER) ? IPV4_MAX_BITLEN : prefixlen; if (dest) { memset(&d, 0, sizeof(d)); d.family = AF_INET; d.u.prefix4 = *dest; d.prefixlen = prefixlen; ifc = connected_check_ptp(ifp, &p, &d); } else ifc = connected_check_ptp(ifp, &p, NULL); connected_delete_helper(ifc, &p); } /* Add connected IPv6 route to the interface. */ void connected_add_ipv6(struct interface *ifp, int flags, const struct in6_addr *addr, const struct in6_addr *dest, uint16_t prefixlen, const char *label, uint32_t metric) { struct prefix_ipv6 *p; struct connected *ifc; if (ipv6_martian(addr)) return; /* Make connected structure. */ ifc = connected_new(); ifc->ifp = ifp; ifc->flags = flags; ifc->metric = metric; /* If we get a notification from the kernel, * we can safely assume the address is known to the kernel */ SET_FLAG(ifc->conf, ZEBRA_IFC_QUEUED); if (!if_is_operative(ifp)) SET_FLAG(ifc->conf, ZEBRA_IFC_DOWN); /* Allocate new connected address. */ p = prefix_ipv6_new(); p->family = AF_INET6; IPV6_ADDR_COPY(&p->prefix, addr); p->prefixlen = prefixlen; ifc->address = (struct prefix *)p; /* Add global ipv6 address to the RA prefix list */ if (!IN6_IS_ADDR_LINKLOCAL(&p->prefix)) rtadv_add_prefix(ifp->info, p); if (dest) { p = prefix_ipv6_new(); p->family = AF_INET6; IPV6_ADDR_COPY(&p->prefix, dest); p->prefixlen = prefixlen; ifc->destination = (struct prefix *)p; } else { if (CHECK_FLAG(ifc->flags, ZEBRA_IFA_PEER)) { zlog_debug( "%s called for interface %s with peer flag set, but no peer address supplied", __func__, ifp->name); UNSET_FLAG(ifc->flags, ZEBRA_IFA_PEER); } } /* Label of this address. */ if (label) ifc->label = XSTRDUP(MTYPE_CONNECTED_LABEL, label); /* On Linux, we only get here when DAD is complete, therefore we can set * ZEBRA_IFC_REAL. * * On BSD, there currently doesn't seem to be a way to check for * completion of * DAD, so we replicate the old behaviour and set ZEBRA_IFC_REAL, * although DAD * might still be running. */ SET_FLAG(ifc->conf, ZEBRA_IFC_REAL); connected_update(ifp, ifc); } void connected_delete_ipv6(struct interface *ifp, const struct in6_addr *address, const struct in6_addr *dest, uint16_t prefixlen) { struct prefix p, d; struct connected *ifc; memset(&p, 0, sizeof(p)); p.family = AF_INET6; memcpy(&p.u.prefix6, address, sizeof(struct in6_addr)); p.prefixlen = prefixlen; /* Delete global ipv6 address from RA prefix list */ if (!IN6_IS_ADDR_LINKLOCAL(&p.u.prefix6)) rtadv_delete_prefix(ifp->info, &p); if (dest) { memset(&d, 0, sizeof(d)); d.family = AF_INET6; IPV6_ADDR_COPY(&d.u.prefix6, dest); d.prefixlen = prefixlen; ifc = connected_check_ptp(ifp, &p, &d); } else ifc = connected_check_ptp(ifp, &p, NULL); connected_delete_helper(ifc, &p); } int connected_is_unnumbered(struct interface *ifp) { struct connected *connected; struct listnode *node; for (ALL_LIST_ELEMENTS_RO(ifp->connected, node, connected)) { if (CHECK_FLAG(connected->conf, ZEBRA_IFC_REAL) && connected->address->family == AF_INET) return CHECK_FLAG(connected->flags, ZEBRA_IFA_UNNUMBERED); } return 0; }