/* * Copyright (c) 2016 Cisco and/or its affiliates. * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at: * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ #include <vlib/vlib.h> #include <vnet/vnet.h> #include <vnet/ip/format.h> #include <vnet/ip/ip.h> #include <vnet/dpo/drop_dpo.h> #include <vnet/dpo/receive_dpo.h> #include <vnet/dpo/load_balance_map.h> #include <vnet/dpo/lookup_dpo.h> #include <vnet/dpo/interface_dpo.h> #include <vnet/dpo/mpls_disposition.h> #include <vnet/adj/adj.h> #include <vnet/adj/adj_mcast.h> #include <vnet/fib/fib_path.h> #include <vnet/fib/fib_node.h> #include <vnet/fib/fib_table.h> #include <vnet/fib/fib_entry.h> #include <vnet/fib/fib_path_list.h> #include <vnet/fib/fib_internal.h> #include <vnet/fib/fib_urpf_list.h> #include <vnet/fib/mpls_fib.h> /** * Enurmeration of path types */ typedef enum fib_path_type_t_ { /** * Marker. Add new types after this one. */ FIB_PATH_TYPE_FIRST = 0, /** * Attached-nexthop. An interface and a nexthop are known. */ FIB_PATH_TYPE_ATTACHED_NEXT_HOP = FIB_PATH_TYPE_FIRST, /** * attached. Only the interface is known. */ FIB_PATH_TYPE_ATTACHED, /** * recursive. Only the next-hop is known. */ FIB_PATH_TYPE_RECURSIVE, /** * special. nothing is known. so we drop. */ FIB_PATH_TYPE_SPECIAL, /** * exclusive. user provided adj. */ FIB_PATH_TYPE_EXCLUSIVE, /** * deag. Link to a lookup adj in the next table */ FIB_PATH_TYPE_DEAG, /** * interface receive. */ FIB_PATH_TYPE_INTF_RX, /** * receive. it's for-us. */ FIB_PATH_TYPE_RECEIVE, /** * Marker. Add new types before this one, then update it. */ FIB_PATH_TYPE_LAST = FIB_PATH_TYPE_RECEIVE, } __attribute__ ((packed)) fib_path_type_t; /** * The maximum number of path_types */ #define FIB_PATH_TYPE_MAX (FIB_PATH_TYPE_LAST + 1) #define FIB_PATH_TYPES { \ [FIB_PATH_TYPE_ATTACHED_NEXT_HOP] = "attached-nexthop", \ [FIB_PATH_TYPE_ATTACHED] = "attached", \ [FIB_PATH_TYPE_RECURSIVE] = "recursive", \ [FIB_PATH_TYPE_SPECIAL] = "special", \ [FIB_PATH_TYPE_EXCLUSIVE] = "exclusive", \ [FIB_PATH_TYPE_DEAG] = "deag", \ [FIB_PATH_TYPE_INTF_RX] = "intf-rx", \ [FIB_PATH_TYPE_RECEIVE] = "receive", \ } #define FOR_EACH_FIB_PATH_TYPE(_item) \ for (_item = FIB_PATH_TYPE_FIRST; _item <= FIB_PATH_TYPE_LAST; _item++) /** * Enurmeration of path operational (i.e. derived) attributes */ typedef enum fib_path_oper_attribute_t_ { /** * Marker. Add new types after this one. */ FIB_PATH_OPER_ATTRIBUTE_FIRST = 0, /** * The path forms part of a recursive loop. */ FIB_PATH_OPER_ATTRIBUTE_RECURSIVE_LOOP = FIB_PATH_OPER_ATTRIBUTE_FIRST, /** * The path is resolved */ FIB_PATH_OPER_ATTRIBUTE_RESOLVED, /** * The path is attached, despite what the next-hop may say. */ FIB_PATH_OPER_ATTRIBUTE_ATTACHED, /** * The path has become a permanent drop. */ FIB_PATH_OPER_ATTRIBUTE_DROP, /** * Marker. Add new types before this one, then update it. */ FIB_PATH_OPER_ATTRIBUTE_LAST = FIB_PATH_OPER_ATTRIBUTE_DROP, } __attribute__ ((packed)) fib_path_oper_attribute_t; /** * The maximum number of path operational attributes */ #define FIB_PATH_OPER_ATTRIBUTE_MAX (FIB_PATH_OPER_ATTRIBUTE_LAST + 1) #define FIB_PATH_OPER_ATTRIBUTES { \ [FIB_PATH_OPER_ATTRIBUTE_RECURSIVE_LOOP] = "recursive-loop", \ [FIB_PATH_OPER_ATTRIBUTE_RESOLVED] = "resolved", \ [FIB_PATH_OPER_ATTRIBUTE_DROP] = "drop", \ } #define FOR_EACH_FIB_PATH_OPER_ATTRIBUTE(_item) \ for (_item = FIB_PATH_OPER_ATTRIBUTE_FIRST; \ _item <= FIB_PATH_OPER_ATTRIBUTE_LAST; \ _item++) /** * Path flags from the attributes */ typedef enum fib_path_oper_flags_t_ { FIB_PATH_OPER_FLAG_NONE = 0, FIB_PATH_OPER_FLAG_RECURSIVE_LOOP = (1 << FIB_PATH_OPER_ATTRIBUTE_RECURSIVE_LOOP), FIB_PATH_OPER_FLAG_DROP = (1 << FIB_PATH_OPER_ATTRIBUTE_DROP), FIB_PATH_OPER_FLAG_RESOLVED = (1 << FIB_PATH_OPER_ATTRIBUTE_RESOLVED), FIB_PATH_OPER_FLAG_ATTACHED = (1 << FIB_PATH_OPER_ATTRIBUTE_ATTACHED), } __attribute__ ((packed)) fib_path_oper_flags_t; /** * A FIB path */ typedef struct fib_path_t_ { /** * A path is a node in the FIB graph. */ fib_node_t fp_node; /** * The index of the path-list to which this path belongs */ u32 fp_pl_index; /** * This marks the start of the memory area used to hash * the path */ STRUCT_MARK(path_hash_start); /** * Configuration Flags */ fib_path_cfg_flags_t fp_cfg_flags; /** * The type of the path. This is the selector for the union */ fib_path_type_t fp_type; /** * The protocol of the next-hop, i.e. the address family of the * next-hop's address. We can't derive this from the address itself * since the address can be all zeros */ fib_protocol_t fp_nh_proto; /** * UCMP [unnormalised] weigt */ u32 fp_weight; /** * per-type union of the data required to resolve the path */ union { struct { /** * The next-hop */ ip46_address_t fp_nh; /** * The interface */ u32 fp_interface; } attached_next_hop; struct { /** * The interface */ u32 fp_interface; } attached; struct { union { /** * The next-hop */ ip46_address_t fp_ip; struct { /** * The local label to resolve through. */ mpls_label_t fp_local_label; /** * The EOS bit of the resolving label */ mpls_eos_bit_t fp_eos; }; } fp_nh; /** * The FIB table index in which to find the next-hop. */ fib_node_index_t fp_tbl_id; } recursive; struct { /** * The FIB index in which to perfom the next lookup */ fib_node_index_t fp_tbl_id; /** * The RPF-ID to tag the packets with */ fib_rpf_id_t fp_rpf_id; } deag; struct { } special; struct { /** * The user provided 'exclusive' DPO */ dpo_id_t fp_ex_dpo; } exclusive; struct { /** * The interface on which the local address is configured */ u32 fp_interface; /** * The next-hop */ ip46_address_t fp_addr; } receive; struct { /** * The interface on which the packets will be input. */ u32 fp_interface; } intf_rx; }; STRUCT_MARK(path_hash_end); /** * Memebers in this last section represent information that is * dervied during resolution. It should not be copied to new paths * nor compared. */ /** * Operational Flags */ fib_path_oper_flags_t fp_oper_flags; /** * the resolving via fib. not part of the union, since it it not part * of the path's hash. */ fib_node_index_t fp_via_fib; /** * The Data-path objects through which this path resolves for IP. */ dpo_id_t fp_dpo; /** * the index of this path in the parent's child list. */ u32 fp_sibling; } fib_path_t; /* * Array of strings/names for the path types and attributes */ static const char *fib_path_type_names[] = FIB_PATH_TYPES; static const char *fib_path_oper_attribute_names[] = FIB_PATH_OPER_ATTRIBUTES; static const char *fib_path_cfg_attribute_names[] = FIB_PATH_CFG_ATTRIBUTES; /* * The memory pool from which we allocate all the paths */ static fib_path_t *fib_path_pool; /* * Debug macro */ #ifdef FIB_DEBUG #define FIB_PATH_DBG(_p, _fmt, _args...) \ { \ u8 *_tmp = NULL; \ _tmp = fib_path_format(fib_path_get_index(_p), _tmp); \ clib_warning("path:[%d:%s]:" _fmt, \ fib_path_get_index(_p), _tmp, \ ##_args); \ vec_free(_tmp); \ } #else #define FIB_PATH_DBG(_p, _fmt, _args...) #endif static fib_path_t * fib_path_get (fib_node_index_t index) { return (pool_elt_at_index(fib_path_pool, index)); } static fib_node_index_t fib_path_get_index (fib_path_t *path) { return (path - fib_path_pool); } static fib_node_t * fib_path_get_node (fib_node_index_t index) { return ((fib_node_t*)fib_path_get(index)); } static fib_path_t* fib_path_from_fib_node (fib_node_t *node) { #if CLIB_DEBUG > 0 ASSERT(FIB_NODE_TYPE_PATH == node->fn_type); #endif return ((fib_path_t*)node); } u8 * format_fib_path (u8 * s, va_list * args) { fib_path_t *path = va_arg (*args, fib_path_t *); vnet_main_t * vnm = vnet_get_main(); fib_path_oper_attribute_t oattr; fib_path_cfg_attribute_t cattr; s = format (s, " index:%d ", fib_path_get_index(path)); s = format (s, "pl-index:%d ", path->fp_pl_index); s = format (s, "%U ", format_fib_protocol, path->fp_nh_proto); s = format (s, "weight=%d ", path->fp_weight); s = format (s, "%s: ", fib_path_type_names[path->fp_type]); if (FIB_PATH_OPER_FLAG_NONE != path->fp_oper_flags) { s = format(s, " oper-flags:"); FOR_EACH_FIB_PATH_OPER_ATTRIBUTE(oattr) { if ((1<<oattr) & path->fp_oper_flags) { s = format (s, "%s,", fib_path_oper_attribute_names[oattr]); } } } if (FIB_PATH_CFG_FLAG_NONE != path->fp_cfg_flags) { s = format(s, " cfg-flags:"); FOR_EACH_FIB_PATH_CFG_ATTRIBUTE(cattr) { if ((1<<cattr) & path->fp_cfg_flags) { s = format (s, "%s,", fib_path_cfg_attribute_names[cattr]); } } } s = format(s, "\n "); switch (path->fp_type) { case FIB_PATH_TYPE_ATTACHED_NEXT_HOP: s = format (s, "%U", format_ip46_address, &path->attached_next_hop.fp_nh, IP46_TYPE_ANY); if (path->fp_oper_flags & FIB_PATH_OPER_FLAG_DROP) { s = format (s, " if_index:%d", path->attached_next_hop.fp_interface); } else { s = format (s, " %U", format_vnet_sw_interface_name, vnm, vnet_get_sw_interface( vnm, path->attached_next_hop.fp_interface)); if (vnet_sw_interface_is_p2p(vnet_get_main(), path->attached_next_hop.fp_interface)) { s = format (s, " (p2p)"); } } if (!dpo_id_is_valid(&path->fp_dpo)) { s = format(s, "\n unresolved"); } else { s = format(s, "\n %U", format_dpo_id, &path->fp_dpo, 13); } break; case FIB_PATH_TYPE_ATTACHED: if (path->fp_oper_flags & FIB_PATH_OPER_FLAG_DROP) { s = format (s, " if_index:%d", path->attached_next_hop.fp_interface); } else { s = format (s, " %U", format_vnet_sw_interface_name, vnm, vnet_get_sw_interface( vnm, path->attached.fp_interface)); } break; case FIB_PATH_TYPE_RECURSIVE: if (FIB_PROTOCOL_MPLS == path->fp_nh_proto) { s = format (s, "via %U %U", format_mpls_unicast_label, path->recursive.fp_nh.fp_local_label, format_mpls_eos_bit, path->recursive.fp_nh.fp_eos); } else { s = format (s, "via %U", format_ip46_address, &path->recursive.fp_nh.fp_ip, IP46_TYPE_ANY); } s = format (s, " in fib:%d", path->recursive.fp_tbl_id, path->fp_via_fib); s = format (s, " via-fib:%d", path->fp_via_fib); s = format (s, " via-dpo:[%U:%d]", format_dpo_type, path->fp_dpo.dpoi_type, path->fp_dpo.dpoi_index); break; case FIB_PATH_TYPE_RECEIVE: case FIB_PATH_TYPE_INTF_RX: case FIB_PATH_TYPE_SPECIAL: case FIB_PATH_TYPE_DEAG: case FIB_PATH_TYPE_EXCLUSIVE: if (dpo_id_is_valid(&path->fp_dpo)) { s = format(s, "%U", format_dpo_id, &path->fp_dpo, 2); } break; } return (s); } u8 * fib_path_format (fib_node_index_t pi, u8 *s) { fib_path_t *path; path = fib_path_get(pi); ASSERT(NULL != path); return (format (s, "%U", format_fib_path, path)); } u8 * fib_path_adj_format (fib_node_index_t pi, u32 indent, u8 *s) { fib_path_t *path; path = fib_path_get(pi); ASSERT(NULL != path); if (!dpo_id_is_valid(&path->fp_dpo)) { s = format(s, " unresolved"); } else { s = format(s, "%U", format_dpo_id, &path->fp_dpo, 2); } return (s); } /* * fib_path_last_lock_gone * * We don't share paths, we share path lists, so the [un]lock functions * are no-ops */ static void fib_path_last_lock_gone (fib_node_t *node) { ASSERT(0); } static const adj_index_t fib_path_attached_next_hop_get_adj (fib_path_t *path, vnet_link_t link) { if (vnet_sw_interface_is_p2p(vnet_get_main(), path->attached_next_hop.fp_interface)) { /* * if the interface is p2p then the adj for the specific * neighbour on that link will never exist. on p2p links * the subnet address (the attached route) links to the * auto-adj (see below), we want that adj here too. */ return (adj_nbr_add_or_lock(path->fp_nh_proto, link, &zero_addr, path->attached_next_hop.fp_interface)); } else { return (adj_nbr_add_or_lock(path->fp_nh_proto, link, &path->attached_next_hop.fp_nh, path->attached_next_hop.fp_interface)); } } static void fib_path_attached_next_hop_set (fib_path_t *path) { /* * resolve directly via the adjacnecy discribed by the * interface and next-hop */ dpo_set(&path->fp_dpo, DPO_ADJACENCY, fib_proto_to_dpo(path->fp_nh_proto), fib_path_attached_next_hop_get_adj( path, fib_proto_to_link(path->fp_nh_proto))); /* * become a child of the adjacency so we receive updates * when its rewrite changes */ path->fp_sibling = adj_child_add(path->fp_dpo.dpoi_index, FIB_NODE_TYPE_PATH, fib_path_get_index(path)); if (!vnet_sw_interface_is_admin_up(vnet_get_main(), path->attached_next_hop.fp_interface) || !adj_is_up(path->fp_dpo.dpoi_index)) { path->fp_oper_flags &= ~FIB_PATH_OPER_FLAG_RESOLVED; } } static const adj_index_t fib_path_attached_get_adj (fib_path_t *path, vnet_link_t link) { if (vnet_sw_interface_is_p2p(vnet_get_main(), path->attached.fp_interface)) { /* * point-2-point interfaces do not require a glean, since * there is nothing to ARP. Install a rewrite/nbr adj instead */ return (adj_nbr_add_or_lock(path->fp_nh_proto, link, &zero_addr, path->attached.fp_interface)); } else { return (adj_glean_add_or_lock(path->fp_nh_proto, path->attached.fp_interface, NULL)); } } /* * create of update the paths recursive adj */ static void fib_path_recursive_adj_update (fib_path_t *path, fib_forward_chain_type_t fct, dpo_id_t *dpo) { dpo_id_t via_dpo = DPO_INVALID; /* * get the DPO to resolve through from the via-entry */ fib_entry_contribute_forwarding(path->fp_via_fib, fct, &via_dpo); /* * hope for the best - clear if restrictions apply. */ path->fp_oper_flags |= FIB_PATH_OPER_FLAG_RESOLVED; /* * Validate any recursion constraints and over-ride the via * adj if not met */ if (path->fp_oper_flags & FIB_PATH_OPER_FLAG_RECURSIVE_LOOP) { path->fp_oper_flags &= ~FIB_PATH_OPER_FLAG_RESOLVED; dpo_copy(&via_dpo, drop_dpo_get(fib_proto_to_dpo(path->fp_nh_proto))); } else if (path->fp_cfg_flags & FIB_PATH_CFG_FLAG_RESOLVE_HOST) { /* * the via FIB must be a host route. * note the via FIB just added will always be a host route * since it is an RR source added host route. So what we need to * check is whether the route has other sources. If it does then * some other source has added it as a host route. If it doesn't * then it was added only here and inherits forwarding from a cover. * the cover is not a host route. * The RR source is the lowest priority source, so we check if it * is the best. if it is there are no other sources. */ if (fib_entry_get_best_source(path->fp_via_fib) >= FIB_SOURCE_RR) { path->fp_oper_flags &= ~FIB_PATH_OPER_FLAG_RESOLVED; dpo_copy(&via_dpo, drop_dpo_get(fib_proto_to_dpo(path->fp_nh_proto))); /* * PIC edge trigger. let the load-balance maps know */ load_balance_map_path_state_change(fib_path_get_index(path)); } } else if (path->fp_cfg_flags & FIB_PATH_CFG_FLAG_RESOLVE_ATTACHED) { /* * RR source entries inherit the flags from the cover, so * we can check the via directly */ if (!(FIB_ENTRY_FLAG_ATTACHED & fib_entry_get_flags(path->fp_via_fib))) { path->fp_oper_flags &= ~FIB_PATH_OPER_FLAG_RESOLVED; dpo_copy(&via_dpo, drop_dpo_get(fib_proto_to_dpo(path->fp_nh_proto))); /* * PIC edge trigger. let the load-balance maps know */ load_balance_map_path_state_change(fib_path_get_index(path)); } } /* * check for over-riding factors on the FIB entry itself */ if (!fib_entry_is_resolved(path->fp_via_fib)) { path->fp_oper_flags &= ~FIB_PATH_OPER_FLAG_RESOLVED; dpo_copy(&via_dpo, drop_dpo_get(fib_proto_to_dpo(path->fp_nh_proto))); /* * PIC edge trigger. let the load-balance maps know */ load_balance_map_path_state_change(fib_path_get_index(path)); } /* * update the path's contributed DPO */ dpo_copy(dpo, &via_dpo); FIB_PATH_DBG(path, "recursive update: %U", fib_get_lookup_main(path->fp_nh_proto), &path->fp_dpo, 2); dpo_reset(&via_dpo); } /* * fib_path_is_permanent_drop * * Return !0 if the path is configured to permanently drop, * despite other attributes. */ static int fib_path_is_permanent_drop (fib_path_t *path) { return ((path->fp_cfg_flags & FIB_PATH_CFG_FLAG_DROP) || (path->fp_oper_flags & FIB_PATH_OPER_FLAG_DROP)); } /* * fib_path_unresolve * * Remove our dependency on the resolution target */ static void fib_path_unresolve (fib_path_t *path) { /* * the forced drop path does not need unresolving */ if (fib_path_is_permanent_drop(path)) { return; } switch (path->fp_type) { case FIB_PATH_TYPE_RECURSIVE: if (FIB_NODE_INDEX_INVALID != path->fp_via_fib) { fib_prefix_t pfx; fib_entry_get_prefix(path->fp_via_fib, &pfx); fib_entry_child_remove(path->fp_via_fib, path->fp_sibling); fib_table_entry_special_remove(path->recursive.fp_tbl_id, &pfx, FIB_SOURCE_RR); path->fp_via_fib = FIB_NODE_INDEX_INVALID; } break; case FIB_PATH_TYPE_ATTACHED_NEXT_HOP: case FIB_PATH_TYPE_ATTACHED: adj_child_remove(path->fp_dpo.dpoi_index, path->fp_sibling); adj_unlock(path->fp_dpo.dpoi_index); break; case FIB_PATH_TYPE_EXCLUSIVE: dpo_reset(&path->exclusive.fp_ex_dpo); break; case FIB_PATH_TYPE_SPECIAL: case FIB_PATH_TYPE_RECEIVE: case FIB_PATH_TYPE_INTF_RX: case FIB_PATH_TYPE_DEAG: /* * these hold only the path's DPO, which is reset below. */ break; } /* * release the adj we were holding and pick up the * drop just in case. */ dpo_reset(&path->fp_dpo); path->fp_oper_flags &= ~FIB_PATH_OPER_FLAG_RESOLVED; return; } static fib_forward_chain_type_t fib_path_to_chain_type (const fib_path_t *path) { switch (path->fp_nh_proto) { case FIB_PROTOCOL_IP4: return (FIB_FORW_CHAIN_TYPE_UNICAST_IP4); case FIB_PROTOCOL_IP6: return (FIB_FORW_CHAIN_TYPE_UNICAST_IP6); case FIB_PROTOCOL_MPLS: if (FIB_PATH_TYPE_RECURSIVE == path->fp_type && MPLS_EOS == path->recursive.fp_nh.fp_eos) { return (FIB_FORW_CHAIN_TYPE_MPLS_EOS); } else { return (FIB_FORW_CHAIN_TYPE_MPLS_NON_EOS); } } return (FIB_FORW_CHAIN_TYPE_UNICAST_IP4); } /* * fib_path_back_walk_notify * * A back walk has reach this path. */ static fib_node_back_walk_rc_t fib_path_back_walk_notify (fib_node_t *node, fib_node_back_walk_ctx_t *ctx) { fib_path_t *path; path = fib_path_from_fib_node(node); switch (path->fp_type) { case FIB_PATH_TYPE_RECURSIVE: if (FIB_NODE_BW_REASON_FLAG_EVALUATE & ctx->fnbw_reason) { /* * modify the recursive adjacency to use the new forwarding * of the via-fib. * this update is visible to packets in flight in the DP. */ fib_path_recursive_adj_update( path, fib_path_to_chain_type(path), &path->fp_dpo); } if ((FIB_NODE_BW_REASON_FLAG_ADJ_UPDATE & ctx->fnbw_reason) || (FIB_NODE_BW_REASON_FLAG_ADJ_DOWN & ctx->fnbw_reason)) { /* * ADJ updates (complete<->incomplete) do not need to propagate to * recursive entries. * The only reason its needed as far back as here, is that the adj * and the incomplete adj are a different DPO type, so the LBs need * to re-stack. * If this walk was quashed in the fib_entry, then any non-fib_path * children (like tunnels that collapse out the LB when they stack) * would not see the update. */ return (FIB_NODE_BACK_WALK_CONTINUE); } break; case FIB_PATH_TYPE_ATTACHED_NEXT_HOP: /* FIXME comment * ADJ_UPDATE backwalk pass silently through here and up to * the path-list when the multipath adj collapse occurs. * The reason we do this is that the assumtption is that VPP * runs in an environment where the Control-Plane is remote * and hence reacts slowly to link up down. In order to remove * this down link from the ECMP set quickly, we back-walk. * VPP also has dedicated CPUs, so we are not stealing resources * from the CP to do so. */ if (FIB_NODE_BW_REASON_FLAG_INTERFACE_UP & ctx->fnbw_reason) { if (path->fp_oper_flags & FIB_PATH_OPER_FLAG_RESOLVED) { /* * alreday resolved. no need to walk back again */ return (FIB_NODE_BACK_WALK_CONTINUE); } path->fp_oper_flags |= FIB_PATH_OPER_FLAG_RESOLVED; } if (FIB_NODE_BW_REASON_FLAG_INTERFACE_DOWN & ctx->fnbw_reason) { if (!(path->fp_oper_flags & FIB_PATH_OPER_FLAG_RESOLVED)) { /* * alreday unresolved. no need to walk back again */ return (FIB_NODE_BACK_WALK_CONTINUE); } path->fp_oper_flags &= ~FIB_PATH_OPER_FLAG_RESOLVED; } if (FIB_NODE_BW_REASON_FLAG_INTERFACE_DELETE & ctx->fnbw_reason) { /* * The interface this path resolves through has been deleted. * This will leave the path in a permanent drop state. The route * needs to be removed and readded (and hence the path-list deleted) * before it can forward again. */ fib_path_unresolve(path); path->fp_oper_flags |= FIB_PATH_OPER_FLAG_DROP; } if (FIB_NODE_BW_REASON_FLAG_ADJ_UPDATE & ctx->fnbw_reason) { /* * restack the DPO to pick up the correct DPO sub-type */ uword if_is_up; adj_index_t ai; if_is_up = vnet_sw_interface_is_admin_up( vnet_get_main(), path->attached_next_hop.fp_interface); ai = fib_path_attached_next_hop_get_adj( path, fib_proto_to_link(path->fp_nh_proto)); path->fp_oper_flags &= ~FIB_PATH_OPER_FLAG_RESOLVED; if (if_is_up && adj_is_up(ai)) { path->fp_oper_flags |= FIB_PATH_OPER_FLAG_RESOLVED; } dpo_set(&path->fp_dpo, DPO_ADJACENCY, fib_proto_to_dpo(path->fp_nh_proto), ai); adj_unlock(ai); if (!if_is_up) { /* * If the interface is not up there is no reason to walk * back to children. if we did they would only evalute * that this path is unresolved and hence it would * not contribute the adjacency - so it would be wasted * CPU time. */ return (FIB_NODE_BACK_WALK_CONTINUE); } } if (FIB_NODE_BW_REASON_FLAG_ADJ_DOWN & ctx->fnbw_reason) { if (!(path->fp_oper_flags & FIB_PATH_OPER_FLAG_RESOLVED)) { /* * alreday unresolved. no need to walk back again */ return (FIB_NODE_BACK_WALK_CONTINUE); } /* * the adj has gone down. the path is no longer resolved. */ path->fp_oper_flags &= ~FIB_PATH_OPER_FLAG_RESOLVED; } break; case FIB_PATH_TYPE_ATTACHED: /* * FIXME; this could schedule a lower priority walk, since attached * routes are not usually in ECMP configurations so the backwalk to * the FIB entry does not need to be high priority */ if (FIB_NODE_BW_REASON_FLAG_INTERFACE_UP & ctx->fnbw_reason) { path->fp_oper_flags |= FIB_PATH_OPER_FLAG_RESOLVED; } if (FIB_NODE_BW_REASON_FLAG_INTERFACE_DOWN & ctx->fnbw_reason) { path->fp_oper_flags &= ~FIB_PATH_OPER_FLAG_RESOLVED; } if (FIB_NODE_BW_REASON_FLAG_INTERFACE_DELETE & ctx->fnbw_reason) { fib_path_unresolve(path); path->fp_oper_flags |= FIB_PATH_OPER_FLAG_DROP; } break; case FIB_PATH_TYPE_INTF_RX: ASSERT(0); case FIB_PATH_TYPE_DEAG: /* * FIXME When VRF delete is allowed this will need a poke. */ case FIB_PATH_TYPE_SPECIAL: case FIB_PATH_TYPE_RECEIVE: case FIB_PATH_TYPE_EXCLUSIVE: /* * these path types have no parents. so to be * walked from one is unexpected. */ ASSERT(0); break; } /* * propagate the backwalk further to the path-list */ fib_path_list_back_walk(path->fp_pl_index, ctx); return (FIB_NODE_BACK_WALK_CONTINUE); } static void fib_path_memory_show (void) { fib_show_memory_usage("Path", pool_elts(fib_path_pool), pool_len(fib_path_pool), sizeof(fib_path_t)); } /* * The FIB path's graph node virtual function table */ static const fib_node_vft_t fib_path_vft = { .fnv_get = fib_path_get_node, .fnv_last_lock = fib_path_last_lock_gone, .fnv_back_walk = fib_path_back_walk_notify, .fnv_mem_show = fib_path_memory_show, }; static fib_path_cfg_flags_t fib_path_route_flags_to_cfg_flags (const fib_route_path_t *rpath) { fib_path_cfg_flags_t cfg_flags = FIB_PATH_CFG_FLAG_NONE; if (rpath->frp_flags & FIB_ROUTE_PATH_RESOLVE_VIA_HOST) cfg_flags |= FIB_PATH_CFG_FLAG_RESOLVE_HOST; if (rpath->frp_flags & FIB_ROUTE_PATH_RESOLVE_VIA_ATTACHED) cfg_flags |= FIB_PATH_CFG_FLAG_RESOLVE_ATTACHED; if (rpath->frp_flags & FIB_ROUTE_PATH_LOCAL) cfg_flags |= FIB_PATH_CFG_FLAG_LOCAL; if (rpath->frp_flags & FIB_ROUTE_PATH_ATTACHED) cfg_flags |= FIB_PATH_CFG_FLAG_ATTACHED; if (rpath->frp_flags & FIB_ROUTE_PATH_INTF_RX) cfg_flags |= FIB_PATH_CFG_FLAG_INTF_RX; if (rpath->frp_flags & FIB_ROUTE_PATH_RPF_ID) cfg_flags |= FIB_PATH_CFG_FLAG_RPF_ID; if (rpath->frp_flags & FIB_ROUTE_PATH_EXCLUSIVE) cfg_flags |= FIB_PATH_CFG_FLAG_EXCLUSIVE; if (rpath->frp_flags & FIB_ROUTE_PATH_DROP) cfg_flags |= FIB_PATH_CFG_FLAG_DROP; return (cfg_flags); } /* * fib_path_create * * Create and initialise a new path object. * return the index of the path. */ fib_node_index_t fib_path_create (fib_node_index_t pl_index, const fib_route_path_t *rpath) { fib_path_t *path; pool_get(fib_path_pool, path); memset(path, 0, sizeof(*path)); fib_node_init(&path->fp_node, FIB_NODE_TYPE_PATH); dpo_reset(&path->fp_dpo); path->fp_pl_index = pl_index; path->fp_nh_proto = rpath->frp_proto; path->fp_via_fib = FIB_NODE_INDEX_INVALID; path->fp_weight = rpath->frp_weight; if (0 == path->fp_weight) { /* * a weight of 0 is a meaningless value. We could either reject it, and thus force * clients to always use 1, or we can accept it and fixup approrpiately. */ path->fp_weight = 1; } path->fp_cfg_flags = fib_path_route_flags_to_cfg_flags(rpath); /* * deduce the path's tpye from the parementers and save what is needed. */ if (path->fp_cfg_flags & FIB_PATH_CFG_FLAG_LOCAL) { path->fp_type = FIB_PATH_TYPE_RECEIVE; path->receive.fp_interface = rpath->frp_sw_if_index; path->receive.fp_addr = rpath->frp_addr; } else if (path->fp_cfg_flags & FIB_PATH_CFG_FLAG_INTF_RX) { path->fp_type = FIB_PATH_TYPE_INTF_RX; path->intf_rx.fp_interface = rpath->frp_sw_if_index; } else if (path->fp_cfg_flags & FIB_PATH_CFG_FLAG_RPF_ID) { path->fp_type = FIB_PATH_TYPE_DEAG; path->deag.fp_tbl_id = rpath->frp_fib_index; path->deag.fp_rpf_id = rpath->frp_rpf_id; } else if (~0 != rpath->frp_sw_if_index) { if (ip46_address_is_zero(&rpath->frp_addr)) { path->fp_type = FIB_PATH_TYPE_ATTACHED; path->attached.fp_interface = rpath->frp_sw_if_index; } else { path->fp_type = FIB_PATH_TYPE_ATTACHED_NEXT_HOP; path->attached_next_hop.fp_interface = rpath->frp_sw_if_index; path->attached_next_hop.fp_nh = rpath->frp_addr; } } else { if (ip46_address_is_zero(&rpath->frp_addr)) { if (~0 == rpath->frp_fib_index) { path->fp_type = FIB_PATH_TYPE_SPECIAL; } else { path->fp_type = FIB_PATH_TYPE_DEAG; path->deag.fp_tbl_id = rpath->frp_fib_index; } } else { path->fp_type = FIB_PATH_TYPE_RECURSIVE; if (FIB_PROTOCOL_MPLS == path->fp_nh_proto) { path->recursive.fp_nh.fp_local_label = rpath->frp_local_label; path->recursive.fp_nh.fp_eos = rpath->frp_eos; } else { path->recursive.fp_nh.fp_ip = rpath->frp_addr; } path->recursive.fp_tbl_id = rpath->frp_fib_index; } } FIB_PATH_DBG(path, "create"); return (fib_path_get_index(path)); } /* * fib_path_create_special * * Create and initialise a new path object. * return the index of the path. */ fib_node_index_t fib_path_create_special (fib_node_index_t pl_index, fib_protocol_t nh_proto, fib_path_cfg_flags_t flags, const dpo_id_t *dpo) { fib_path_t *path; pool_get(fib_path_pool, path); memset(path, 0, sizeof(*path)); fib_node_init(&path->fp_node, FIB_NODE_TYPE_PATH); dpo_reset(&path->fp_dpo); path->fp_pl_index = pl_index; path->fp_weight = 1; path->fp_nh_proto = nh_proto; path->fp_via_fib = FIB_NODE_INDEX_INVALID; path->fp_cfg_flags = flags; if (FIB_PATH_CFG_FLAG_DROP & flags) { path->fp_type = FIB_PATH_TYPE_SPECIAL; } else if (FIB_PATH_CFG_FLAG_LOCAL & flags) { path->fp_type = FIB_PATH_TYPE_RECEIVE; path->attached.fp_interface = FIB_NODE_INDEX_INVALID; } else { path->fp_type = FIB_PATH_TYPE_EXCLUSIVE; ASSERT(NULL != dpo); dpo_copy(&path->exclusive.fp_ex_dpo, dpo); } return (fib_path_get_index(path)); } /* * fib_path_copy * * Copy a path. return index of new path. */ fib_node_index_t fib_path_copy (fib_node_index_t path_index, fib_node_index_t path_list_index) { fib_path_t *path, *orig_path; pool_get(fib_path_pool, path); orig_path = fib_path_get(path_index); ASSERT(NULL != orig_path); memcpy(path, orig_path, sizeof(*path)); FIB_PATH_DBG(path, "create-copy:%d", path_index); /* * reset the dynamic section */ fib_node_init(&path->fp_node, FIB_NODE_TYPE_PATH); path->fp_oper_flags = FIB_PATH_OPER_FLAG_NONE; path->fp_pl_index = path_list_index; path->fp_via_fib = FIB_NODE_INDEX_INVALID; memset(&path->fp_dpo, 0, sizeof(path->fp_dpo)); dpo_reset(&path->fp_dpo); return (fib_path_get_index(path)); } /* * fib_path_destroy * * destroy a path that is no longer required */ void fib_path_destroy (fib_node_index_t path_index) { fib_path_t *path; path = fib_path_get(path_index); ASSERT(NULL != path); FIB_PATH_DBG(path, "destroy"); fib_path_unresolve(path); fib_node_deinit(&path->fp_node); pool_put(fib_path_pool, path); } /* * fib_path_destroy * * destroy a path that is no longer required */ uword fib_path_hash (fib_node_index_t path_index) { fib_path_t *path; path = fib_path_get(path_index); return (hash_memory(STRUCT_MARK_PTR(path, path_hash_start), (STRUCT_OFFSET_OF(fib_path_t, path_hash_end) - STRUCT_OFFSET_OF(fib_path_t, path_hash_start)), 0)); } /* * fib_path_cmp_i * * Compare two paths for equivalence. */ static int fib_path_cmp_i (const fib_path_t *path1, const fib_path_t *path2) { int res; res = 1; /* * paths of different types and protocol are not equal. * different weights only are the same path. */ if (path1->fp_type != path2->fp_type) { res = (path1->fp_type - path2->fp_type); } else if (path1->fp_nh_proto != path2->fp_nh_proto) { res = (path1->fp_nh_proto - path2->fp_nh_proto); } else { /* * both paths are of the same type. * consider each type and its attributes in turn. */ switch (path1->fp_type) { case FIB_PATH_TYPE_ATTACHED_NEXT_HOP: res = ip46_address_cmp(&path1->attached_next_hop.fp_nh, &path2->attached_next_hop.fp_nh); if (0 == res) { res = (path1->attached_next_hop.fp_interface - path2->attached_next_hop.fp_interface); } break; case FIB_PATH_TYPE_ATTACHED: res = (path1->attached.fp_interface - path2->attached.fp_interface); break; case FIB_PATH_TYPE_RECURSIVE: res = ip46_address_cmp(&path1->recursive.fp_nh, &path2->recursive.fp_nh); if (0 == res) { res = (path1->recursive.fp_tbl_id - path2->recursive.fp_tbl_id); } break; case FIB_PATH_TYPE_DEAG: res = (path1->deag.fp_tbl_id - path2->deag.fp_tbl_id); if (0 == res) { res = (path1->deag.fp_rpf_id - path2->deag.fp_rpf_id); } break; case FIB_PATH_TYPE_INTF_RX: res = (path1->intf_rx.fp_interface - path2->intf_rx.fp_interface); break; case FIB_PATH_TYPE_SPECIAL: case FIB_PATH_TYPE_RECEIVE: case FIB_PATH_TYPE_EXCLUSIVE: res = 0; break; } } return (res); } /* * fib_path_cmp_for_sort * * Compare two paths for equivalence. Used during path sorting. * As usual 0 means equal. */ int fib_path_cmp_for_sort (void * v1, void * v2) { fib_node_index_t *pi1 = v1, *pi2 = v2; fib_path_t *path1, *path2; path1 = fib_path_get(*pi1); path2 = fib_path_get(*pi2); return (fib_path_cmp_i(path1, path2)); } /* * fib_path_cmp * * Compare two paths for equivalence. */ int fib_path_cmp (fib_node_index_t pi1, fib_node_index_t pi2) { fib_path_t *path1, *path2; path1 = fib_path_get(pi1); path2 = fib_path_get(pi2); return (fib_path_cmp_i(path1, path2)); } int fib_path_cmp_w_route_path (fib_node_index_t path_index, const fib_route_path_t *rpath) { fib_path_t *path; int res; path = fib_path_get(path_index); res = 1; if (path->fp_weight != rpath->frp_weight) { res = (path->fp_weight - rpath->frp_weight); } else { /* * both paths are of the same type. * consider each type and its attributes in turn. */ switch (path->fp_type) { case FIB_PATH_TYPE_ATTACHED_NEXT_HOP: res = ip46_address_cmp(&path->attached_next_hop.fp_nh, &rpath->frp_addr); if (0 == res) { res = (path->attached_next_hop.fp_interface - rpath->frp_sw_if_index); } break; case FIB_PATH_TYPE_ATTACHED: res = (path->attached.fp_interface - rpath->frp_sw_if_index); break; case FIB_PATH_TYPE_RECURSIVE: if (FIB_PROTOCOL_MPLS == path->fp_nh_proto) { res = path->recursive.fp_nh.fp_local_label - rpath->frp_local_label; if (res == 0) { res = path->recursive.fp_nh.fp_eos - rpath->frp_eos; } } else { res = ip46_address_cmp(&path->recursive.fp_nh.fp_ip, &rpath->frp_addr); } if (0 == res) { res = (path->recursive.fp_tbl_id - rpath->frp_fib_index); } break; case FIB_PATH_TYPE_INTF_RX: res = (path->intf_rx.fp_interface - rpath->frp_sw_if_index); break; case FIB_PATH_TYPE_DEAG: res = (path->deag.fp_tbl_id - rpath->frp_fib_index); if (0 == res) { res = (path->deag.fp_rpf_id - rpath->frp_rpf_id); } break; case FIB_PATH_TYPE_SPECIAL: case FIB_PATH_TYPE_RECEIVE: case FIB_PATH_TYPE_EXCLUSIVE: res = 0; break; } } return (res); } /* * fib_path_recursive_loop_detect * * A forward walk of the FIB object graph to detect for a cycle/loop. This * walk is initiated when an entry is linking to a new path list or from an old. * The entry vector passed contains all the FIB entrys that are children of this * path (it is all the entries encountered on the walk so far). If this vector * contains the entry this path resolve via, then a loop is about to form. * The loop must be allowed to form, since we need the dependencies in place * so that we can track when the loop breaks. * However, we MUST not produce a loop in the forwarding graph (else packets * would loop around the switch path until the loop breaks), so we mark recursive * paths as looped so that they do not contribute forwarding information. * By marking the path as looped, an etry such as; * X/Y * via a.a.a.a (looped) * via b.b.b.b (not looped) * can still forward using the info provided by b.b.b.b only */ int fib_path_recursive_loop_detect (fib_node_index_t path_index, fib_node_index_t **entry_indicies) { fib_path_t *path; path = fib_path_get(path_index); /* * the forced drop path is never looped, cos it is never resolved. */ if (fib_path_is_permanent_drop(path)) { return (0); } switch (path->fp_type) { case FIB_PATH_TYPE_RECURSIVE: { fib_node_index_t *entry_index, *entries; int looped = 0; entries = *entry_indicies; vec_foreach(entry_index, entries) { if (*entry_index == path->fp_via_fib) { /* * the entry that is about to link to this path-list (or * one of this path-list's children) is the same entry that * this recursive path resolves through. this is a cycle. * abort the walk. */ looped = 1; break; } } if (looped) { FIB_PATH_DBG(path, "recursive loop formed"); path->fp_oper_flags |= FIB_PATH_OPER_FLAG_RECURSIVE_LOOP; dpo_copy(&path->fp_dpo, drop_dpo_get(fib_proto_to_dpo(path->fp_nh_proto))); } else { /* * no loop here yet. keep forward walking the graph. */ if (fib_entry_recursive_loop_detect(path->fp_via_fib, entry_indicies)) { FIB_PATH_DBG(path, "recursive loop formed"); path->fp_oper_flags |= FIB_PATH_OPER_FLAG_RECURSIVE_LOOP; } else { FIB_PATH_DBG(path, "recursive loop cleared"); path->fp_oper_flags &= ~FIB_PATH_OPER_FLAG_RECURSIVE_LOOP; } } break; } case FIB_PATH_TYPE_ATTACHED_NEXT_HOP: case FIB_PATH_TYPE_ATTACHED: case FIB_PATH_TYPE_SPECIAL: case FIB_PATH_TYPE_DEAG: case FIB_PATH_TYPE_RECEIVE: case FIB_PATH_TYPE_INTF_RX: case FIB_PATH_TYPE_EXCLUSIVE: /* * these path types cannot be part of a loop, since they are the leaves * of the graph. */ break; } return (fib_path_is_looped(path_index)); } int fib_path_resolve (fib_node_index_t path_index) { fib_path_t *path; path = fib_path_get(path_index); /* * hope for the best. */ path->fp_oper_flags |= FIB_PATH_OPER_FLAG_RESOLVED; /* * the forced drop path resolves via the drop adj */ if (fib_path_is_permanent_drop(path)) { dpo_copy(&path->fp_dpo, drop_dpo_get(fib_proto_to_dpo(path->fp_nh_proto))); path->fp_oper_flags &= ~FIB_PATH_OPER_FLAG_RESOLVED; return (fib_path_is_resolved(path_index)); } switch (path->fp_type) { case FIB_PATH_TYPE_ATTACHED_NEXT_HOP: fib_path_attached_next_hop_set(path); break; case FIB_PATH_TYPE_ATTACHED: /* * path->attached.fp_interface */ if (!vnet_sw_interface_is_admin_up(vnet_get_main(), path->attached.fp_interface)) { path->fp_oper_flags &= ~FIB_PATH_OPER_FLAG_RESOLVED; } dpo_set(&path->fp_dpo, DPO_ADJACENCY, fib_proto_to_dpo(path->fp_nh_proto), fib_path_attached_get_adj(path, fib_proto_to_link(path->fp_nh_proto))); /* * become a child of the adjacency so we receive updates * when the interface state changes */ path->fp_sibling = adj_child_add(path->fp_dpo.dpoi_index, FIB_NODE_TYPE_PATH, fib_path_get_index(path)); break; case FIB_PATH_TYPE_RECURSIVE: { /* * Create a RR source entry in the table for the address * that this path recurses through. * This resolve action is recursive, hence we may create * more paths in the process. more creates mean maybe realloc * of this path. */ fib_node_index_t fei; fib_prefix_t pfx; ASSERT(FIB_NODE_INDEX_INVALID == path->fp_via_fib); if (FIB_PROTOCOL_MPLS == path->fp_nh_proto) { fib_prefix_from_mpls_label(path->recursive.fp_nh.fp_local_label, path->recursive.fp_nh.fp_eos, &pfx); } else { fib_prefix_from_ip46_addr(&path->recursive.fp_nh.fp_ip, &pfx); } fei = fib_table_entry_special_add(path->recursive.fp_tbl_id, &pfx, FIB_SOURCE_RR, FIB_ENTRY_FLAG_NONE); path = fib_path_get(path_index); path->fp_via_fib = fei; /* * become a dependent child of the entry so the path is * informed when the forwarding for the entry changes. */ path->fp_sibling = fib_entry_child_add(path->fp_via_fib, FIB_NODE_TYPE_PATH, fib_path_get_index(path)); /* * create and configure the IP DPO */ fib_path_recursive_adj_update( path, fib_path_to_chain_type(path), &path->fp_dpo); break; } case FIB_PATH_TYPE_SPECIAL: /* * Resolve via the drop */ dpo_copy(&path->fp_dpo, drop_dpo_get(fib_proto_to_dpo(path->fp_nh_proto))); break; case FIB_PATH_TYPE_DEAG: { /* * Resolve via a lookup DPO. * FIXME. control plane should add routes with a table ID */ lookup_cast_t cast; cast = (path->fp_cfg_flags & FIB_PATH_CFG_FLAG_RPF_ID ? LOOKUP_MULTICAST : LOOKUP_UNICAST); lookup_dpo_add_or_lock_w_fib_index(path->deag.fp_tbl_id, fib_proto_to_dpo(path->fp_nh_proto), cast, LOOKUP_INPUT_DST_ADDR, LOOKUP_TABLE_FROM_CONFIG, &path->fp_dpo); break; } case FIB_PATH_TYPE_RECEIVE: /* * Resolve via a receive DPO. */ receive_dpo_add_or_lock(fib_proto_to_dpo(path->fp_nh_proto), path->receive.fp_interface, &path->receive.fp_addr, &path->fp_dpo); break; case FIB_PATH_TYPE_INTF_RX: { /* * Resolve via a receive DPO. */ interface_dpo_add_or_lock(fib_proto_to_dpo(path->fp_nh_proto), path->intf_rx.fp_interface, &path->fp_dpo); break; } case FIB_PATH_TYPE_EXCLUSIVE: /* * Resolve via the user provided DPO */ dpo_copy(&path->fp_dpo, &path->exclusive.fp_ex_dpo); break; } return (fib_path_is_resolved(path_index)); } u32 fib_path_get_resolving_interface (fib_node_index_t path_index) { fib_path_t *path; path = fib_path_get(path_index); switch (path->fp_type) { case FIB_PATH_TYPE_ATTACHED_NEXT_HOP: return (path->attached_next_hop.fp_interface); case FIB_PATH_TYPE_ATTACHED: return (path->attached.fp_interface); case FIB_PATH_TYPE_RECEIVE: return (path->receive.fp_interface); case FIB_PATH_TYPE_RECURSIVE: if (fib_path_is_resolved(path_index)) { return (fib_entry_get_resolving_interface(path->fp_via_fib)); } break; case FIB_PATH_TYPE_INTF_RX: case FIB_PATH_TYPE_SPECIAL: case FIB_PATH_TYPE_DEAG: case FIB_PATH_TYPE_EXCLUSIVE: break; } return (~0); } adj_index_t fib_path_get_adj (fib_node_index_t path_index) { fib_path_t *path; path = fib_path_get(path_index); ASSERT(dpo_is_adj(&path->fp_dpo)); if (dpo_is_adj(&path->fp_dpo)) { return (path->fp_dpo.dpoi_index); } return (ADJ_INDEX_INVALID); } int fib_path_get_weight (fib_node_index_t path_index) { fib_path_t *path; path = fib_path_get(path_index); ASSERT(path); return (path->fp_weight); } /** * @brief Contribute the path's adjacency to the list passed. * By calling this function over all paths, recursively, a child * can construct its full set of forwarding adjacencies, and hence its * uRPF list. */ void fib_path_contribute_urpf (fib_node_index_t path_index, index_t urpf) { fib_path_t *path; path = fib_path_get(path_index); /* * resolved and unresolved paths contribute to the RPF list. */ switch (path->fp_type) { case FIB_PATH_TYPE_ATTACHED_NEXT_HOP: fib_urpf_list_append(urpf, path->attached_next_hop.fp_interface); break; case FIB_PATH_TYPE_ATTACHED: fib_urpf_list_append(urpf, path->attached.fp_interface); break; case FIB_PATH_TYPE_RECURSIVE: if (FIB_NODE_INDEX_INVALID != path->fp_via_fib && !fib_path_is_looped(path_index)) { /* * there's unresolved due to constraints, and there's unresolved * due to ain't got no via. can't do nowt w'out via. */ fib_entry_contribute_urpf(path->fp_via_fib, urpf); } break; case FIB_PATH_TYPE_EXCLUSIVE: case FIB_PATH_TYPE_SPECIAL: /* * these path types may link to an adj, if that's what * the clinet gave */ if (dpo_is_adj(&path->fp_dpo)) { ip_adjacency_t *adj; adj = adj_get(path->fp_dpo.dpoi_index); fib_urpf_list_append(urpf, adj->rewrite_header.sw_if_index); } break; case FIB_PATH_TYPE_DEAG: case FIB_PATH_TYPE_RECEIVE: case FIB_PATH_TYPE_INTF_RX: /* * these path types don't link to an adj */ break; } } void fib_path_stack_mpls_disp (fib_node_index_t path_index, dpo_proto_t payload_proto, dpo_id_t *dpo) { fib_path_t *path; path = fib_path_get(path_index); ASSERT(path); switch (path->fp_type) { case FIB_PATH_TYPE_DEAG: { dpo_id_t tmp = DPO_INVALID; dpo_copy(&tmp, dpo); dpo_set(dpo, DPO_MPLS_DISPOSITION, payload_proto, mpls_disp_dpo_create(payload_proto, path->deag.fp_rpf_id, &tmp)); dpo_reset(&tmp); break; } case FIB_PATH_TYPE_RECEIVE: case FIB_PATH_TYPE_ATTACHED: case FIB_PATH_TYPE_ATTACHED_NEXT_HOP: case FIB_PATH_TYPE_RECURSIVE: case FIB_PATH_TYPE_INTF_RX: case FIB_PATH_TYPE_EXCLUSIVE: case FIB_PATH_TYPE_SPECIAL: break; } } void fib_path_contribute_forwarding (fib_node_index_t path_index, fib_forward_chain_type_t fct, dpo_id_t *dpo) { fib_path_t *path; path = fib_path_get(path_index); ASSERT(path); ASSERT(FIB_FORW_CHAIN_TYPE_MPLS_EOS != fct); FIB_PATH_DBG(path, "contribute"); /* * The DPO stored in the path was created when the path was resolved. * This then represents the path's 'native' protocol; IP. * For all others will need to go find something else. */ if (fib_path_to_chain_type(path) == fct) { dpo_copy(dpo, &path->fp_dpo); } else { switch (path->fp_type) { case FIB_PATH_TYPE_ATTACHED_NEXT_HOP: switch (fct) { case FIB_FORW_CHAIN_TYPE_UNICAST_IP4: case FIB_FORW_CHAIN_TYPE_UNICAST_IP6: case FIB_FORW_CHAIN_TYPE_MPLS_EOS: case FIB_FORW_CHAIN_TYPE_MPLS_NON_EOS: case FIB_FORW_CHAIN_TYPE_ETHERNET: case FIB_FORW_CHAIN_TYPE_NSH: { adj_index_t ai; /* * get a appropriate link type adj. */ ai = fib_path_attached_next_hop_get_adj( path, fib_forw_chain_type_to_link_type(fct)); dpo_set(dpo, DPO_ADJACENCY, fib_forw_chain_type_to_dpo_proto(fct), ai); adj_unlock(ai); break; } case FIB_FORW_CHAIN_TYPE_MCAST_IP4: case FIB_FORW_CHAIN_TYPE_MCAST_IP6: break; } break; case FIB_PATH_TYPE_RECURSIVE: switch (fct) { case FIB_FORW_CHAIN_TYPE_MPLS_EOS: case FIB_FORW_CHAIN_TYPE_UNICAST_IP4: case FIB_FORW_CHAIN_TYPE_UNICAST_IP6: case FIB_FORW_CHAIN_TYPE_MPLS_NON_EOS: case FIB_FORW_CHAIN_TYPE_MCAST_IP4: case FIB_FORW_CHAIN_TYPE_MCAST_IP6: fib_path_recursive_adj_update(path, fct, dpo); break; case FIB_FORW_CHAIN_TYPE_ETHERNET: case FIB_FORW_CHAIN_TYPE_NSH: ASSERT(0); break; } break; case FIB_PATH_TYPE_DEAG: switch (fct) { case FIB_FORW_CHAIN_TYPE_MPLS_NON_EOS: lookup_dpo_add_or_lock_w_table_id(MPLS_FIB_DEFAULT_TABLE_ID, DPO_PROTO_MPLS, LOOKUP_UNICAST, LOOKUP_INPUT_DST_ADDR, LOOKUP_TABLE_FROM_CONFIG, dpo); break; case FIB_FORW_CHAIN_TYPE_MPLS_EOS: case FIB_FORW_CHAIN_TYPE_UNICAST_IP4: case FIB_FORW_CHAIN_TYPE_UNICAST_IP6: dpo_copy(dpo, &path->fp_dpo); break; case FIB_FORW_CHAIN_TYPE_MCAST_IP4: case FIB_FORW_CHAIN_TYPE_MCAST_IP6: case FIB_FORW_CHAIN_TYPE_ETHERNET: case FIB_FORW_CHAIN_TYPE_NSH: ASSERT(0); break; } break; case FIB_PATH_TYPE_EXCLUSIVE: dpo_copy(dpo, &path->exclusive.fp_ex_dpo); break; case FIB_PATH_TYPE_ATTACHED: switch (fct) { case FIB_FORW_CHAIN_TYPE_MPLS_NON_EOS: case FIB_FORW_CHAIN_TYPE_UNICAST_IP4: case FIB_FORW_CHAIN_TYPE_UNICAST_IP6: case FIB_FORW_CHAIN_TYPE_MPLS_EOS: case FIB_FORW_CHAIN_TYPE_ETHERNET: case FIB_FORW_CHAIN_TYPE_NSH: { adj_index_t ai; /* * get a appropriate link type adj. */ ai = fib_path_attached_get_adj( path, fib_forw_chain_type_to_link_type(fct)); dpo_set(dpo, DPO_ADJACENCY, fib_forw_chain_type_to_dpo_proto(fct), ai); adj_unlock(ai); break; } case FIB_FORW_CHAIN_TYPE_MCAST_IP4: case FIB_FORW_CHAIN_TYPE_MCAST_IP6: { adj_index_t ai; /* * Create the adj needed for sending IP multicast traffic */ ai = adj_mcast_add_or_lock(path->fp_nh_proto, fib_forw_chain_type_to_link_type(fct), path->attached.fp_interface); dpo_set(dpo, DPO_ADJACENCY, fib_forw_chain_type_to_dpo_proto(fct), ai); adj_unlock(ai); } break; } break; case FIB_PATH_TYPE_INTF_RX: /* * Create the adj needed for sending IP multicast traffic */ interface_dpo_add_or_lock(fib_forw_chain_type_to_dpo_proto(fct), path->attached.fp_interface, dpo); break; case FIB_PATH_TYPE_RECEIVE: case FIB_PATH_TYPE_SPECIAL: dpo_copy(dpo, &path->fp_dpo); break; } } } load_balance_path_t * fib_path_append_nh_for_multipath_hash (fib_node_index_t path_index, fib_forward_chain_type_t fct, load_balance_path_t *hash_key) { load_balance_path_t *mnh; fib_path_t *path; path = fib_path_get(path_index); ASSERT(path); if (fib_path_is_resolved(path_index)) { vec_add2(hash_key, mnh, 1); mnh->path_weight = path->fp_weight; mnh->path_index = path_index; fib_path_contribute_forwarding(path_index, fct, &mnh->path_dpo); } return (hash_key); } int fib_path_is_recursive_constrained (fib_node_index_t path_index) { fib_path_t *path; path = fib_path_get(path_index); return ((FIB_PATH_TYPE_RECURSIVE == path->fp_type) && ((path->fp_cfg_flags & FIB_PATH_CFG_FLAG_RESOLVE_ATTACHED) || (path->fp_cfg_flags & FIB_PATH_CFG_FLAG_RESOLVE_HOST))); } int fib_path_is_exclusive (fib_node_index_t path_index) { fib_path_t *path; path = fib_path_get(path_index); return (FIB_PATH_TYPE_EXCLUSIVE == path->fp_type); } int fib_path_is_deag (fib_node_index_t path_index) { fib_path_t *path; path = fib_path_get(path_index); return (FIB_PATH_TYPE_DEAG == path->fp_type); } int fib_path_is_resolved (fib_node_index_t path_index) { fib_path_t *path; path = fib_path_get(path_index); return (dpo_id_is_valid(&path->fp_dpo) && (path->fp_oper_flags & FIB_PATH_OPER_FLAG_RESOLVED) && !fib_path_is_looped(path_index) && !fib_path_is_permanent_drop(path)); } int fib_path_is_looped (fib_node_index_t path_index) { fib_path_t *path; path = fib_path_get(path_index); return (path->fp_oper_flags & FIB_PATH_OPER_FLAG_RECURSIVE_LOOP); } fib_path_list_walk_rc_t fib_path_encode (fib_node_index_t path_list_index, fib_node_index_t path_index, void *ctx) { fib_route_path_encode_t **api_rpaths = ctx; fib_route_path_encode_t *api_rpath; fib_path_t *path; path = fib_path_get(path_index); if (!path) return (FIB_PATH_LIST_WALK_CONTINUE); vec_add2(*api_rpaths, api_rpath, 1); api_rpath->rpath.frp_weight = path->fp_weight; api_rpath->rpath.frp_proto = path->fp_nh_proto; api_rpath->rpath.frp_sw_if_index = ~0; api_rpath->dpo = path->exclusive.fp_ex_dpo; switch (path->fp_type) { case FIB_PATH_TYPE_RECEIVE: api_rpath->rpath.frp_addr = path->receive.fp_addr; api_rpath->rpath.frp_sw_if_index = path->receive.fp_interface; break; case FIB_PATH_TYPE_ATTACHED: api_rpath->rpath.frp_sw_if_index = path->attached.fp_interface; break; case FIB_PATH_TYPE_ATTACHED_NEXT_HOP: api_rpath->rpath.frp_sw_if_index = path->attached_next_hop.fp_interface; api_rpath->rpath.frp_addr = path->attached_next_hop.fp_nh; break; case FIB_PATH_TYPE_SPECIAL: break; case FIB_PATH_TYPE_DEAG: break; case FIB_PATH_TYPE_RECURSIVE: api_rpath->rpath.frp_addr = path->recursive.fp_nh.fp_ip; break; default: break; } return (FIB_PATH_LIST_WALK_CONTINUE); } fib_protocol_t fib_path_get_proto (fib_node_index_t path_index) { fib_path_t *path; path = fib_path_get(path_index); return (path->fp_nh_proto); } void fib_path_module_init (void) { fib_node_register_type (FIB_NODE_TYPE_PATH, &fib_path_vft); } static clib_error_t * show_fib_path_command (vlib_main_t * vm, unformat_input_t * input, vlib_cli_command_t * cmd) { fib_node_index_t pi; fib_path_t *path; if (unformat (input, "%d", &pi)) { /* * show one in detail */ if (!pool_is_free_index(fib_path_pool, pi)) { path = fib_path_get(pi); u8 *s = fib_path_format(pi, NULL); s = format(s, "children:"); s = fib_node_children_format(path->fp_node.fn_children, s); vlib_cli_output (vm, "%s", s); vec_free(s); } else { vlib_cli_output (vm, "path %d invalid", pi); } } else { vlib_cli_output (vm, "FIB Paths"); pool_foreach(path, fib_path_pool, ({ vlib_cli_output (vm, "%U", format_fib_path, path); })); } return (NULL); } VLIB_CLI_COMMAND (show_fib_path, static) = { .path = "show fib paths", .function = show_fib_path_command, .short_help = "show fib paths", };