| /* |
| * Copyright (c) 2015 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. |
| */ |
| /* |
| * ip/ip4_forward.c: IP v4 forwarding |
| * |
| * Copyright (c) 2008 Eliot Dresselhaus |
| * |
| * Permission is hereby granted, free of charge, to any person obtaining |
| * a copy of this software and associated documentation files (the |
| * "Software"), to deal in the Software without restriction, including |
| * without limitation the rights to use, copy, modify, merge, publish, |
| * distribute, sublicense, and/or sell copies of the Software, and to |
| * permit persons to whom the Software is furnished to do so, subject to |
| * the following conditions: |
| * |
| * The above copyright notice and this permission notice shall be |
| * included in all copies or substantial portions of the Software. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
| * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
| * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND |
| * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE |
| * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION |
| * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION |
| * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
| */ |
| |
| #include <vnet/vnet.h> |
| #include <vnet/ip/ip.h> |
| #include <vnet/ip/ip_frag.h> |
| #include <vnet/ethernet/ethernet.h> /* for ethernet_header_t */ |
| #include <vnet/ethernet/arp_packet.h> /* for ethernet_arp_header_t */ |
| #include <vnet/ppp/ppp.h> |
| #include <vnet/srp/srp.h> /* for srp_hw_interface_class */ |
| #include <vnet/api_errno.h> /* for API error numbers */ |
| #include <vnet/fib/fib_table.h> /* for FIB table and entry creation */ |
| #include <vnet/fib/fib_entry.h> /* for FIB table and entry creation */ |
| #include <vnet/fib/fib_urpf_list.h> /* for FIB uRPF check */ |
| #include <vnet/fib/ip4_fib.h> |
| #include <vnet/dpo/load_balance.h> |
| #include <vnet/dpo/load_balance_map.h> |
| #include <vnet/dpo/classify_dpo.h> |
| #include <vnet/mfib/mfib_table.h> /* for mFIB table and entry creation */ |
| |
| #include <vnet/ip/ip4_forward.h> |
| |
| /** @brief IPv4 lookup node. |
| @node ip4-lookup |
| |
| This is the main IPv4 lookup dispatch node. |
| |
| @param vm vlib_main_t corresponding to the current thread |
| @param node vlib_node_runtime_t |
| @param frame vlib_frame_t whose contents should be dispatched |
| |
| @par Graph mechanics: buffer metadata, next index usage |
| |
| @em Uses: |
| - <code>vnet_buffer(b)->sw_if_index[VLIB_RX]</code> |
| - Indicates the @c sw_if_index value of the interface that the |
| packet was received on. |
| - <code>vnet_buffer(b)->sw_if_index[VLIB_TX]</code> |
| - When the value is @c ~0 then the node performs a longest prefix |
| match (LPM) for the packet destination address in the FIB attached |
| to the receive interface. |
| - Otherwise perform LPM for the packet destination address in the |
| indicated FIB. In this case <code>[VLIB_TX]</code> is a FIB index |
| value (0, 1, ...) and not a VRF id. |
| |
| @em Sets: |
| - <code>vnet_buffer(b)->ip.adj_index[VLIB_TX]</code> |
| - The lookup result adjacency index. |
| |
| <em>Next Index:</em> |
| - Dispatches the packet to the node index found in |
| ip_adjacency_t @c adj->lookup_next_index |
| (where @c adj is the lookup result adjacency). |
| */ |
| VLIB_NODE_FN (ip4_lookup_node) (vlib_main_t * vm, vlib_node_runtime_t * node, |
| vlib_frame_t * frame) |
| { |
| return ip4_lookup_inline (vm, node, frame, |
| /* lookup_for_responses_to_locally_received_packets */ |
| 0); |
| |
| } |
| |
| static u8 *format_ip4_lookup_trace (u8 * s, va_list * args); |
| |
| /* *INDENT-OFF* */ |
| VLIB_REGISTER_NODE (ip4_lookup_node) = |
| { |
| .name = "ip4-lookup", |
| .vector_size = sizeof (u32), |
| .format_trace = format_ip4_lookup_trace, |
| .n_next_nodes = IP_LOOKUP_N_NEXT, |
| .next_nodes = IP4_LOOKUP_NEXT_NODES, |
| }; |
| /* *INDENT-ON* */ |
| |
| VLIB_NODE_FN (ip4_load_balance_node) (vlib_main_t * vm, |
| vlib_node_runtime_t * node, |
| vlib_frame_t * frame) |
| { |
| vlib_combined_counter_main_t *cm = &load_balance_main.lbm_via_counters; |
| u32 n_left_from, n_left_to_next, *from, *to_next; |
| ip_lookup_next_t next; |
| u32 thread_index = vm->thread_index; |
| |
| from = vlib_frame_vector_args (frame); |
| n_left_from = frame->n_vectors; |
| next = node->cached_next_index; |
| |
| while (n_left_from > 0) |
| { |
| vlib_get_next_frame (vm, node, next, to_next, n_left_to_next); |
| |
| |
| while (n_left_from >= 4 && n_left_to_next >= 2) |
| { |
| ip_lookup_next_t next0, next1; |
| const load_balance_t *lb0, *lb1; |
| vlib_buffer_t *p0, *p1; |
| u32 pi0, lbi0, hc0, pi1, lbi1, hc1; |
| const ip4_header_t *ip0, *ip1; |
| const dpo_id_t *dpo0, *dpo1; |
| |
| /* Prefetch next iteration. */ |
| { |
| vlib_buffer_t *p2, *p3; |
| |
| p2 = vlib_get_buffer (vm, from[2]); |
| p3 = vlib_get_buffer (vm, from[3]); |
| |
| vlib_prefetch_buffer_header (p2, STORE); |
| vlib_prefetch_buffer_header (p3, STORE); |
| |
| CLIB_PREFETCH (p2->data, sizeof (ip0[0]), STORE); |
| CLIB_PREFETCH (p3->data, sizeof (ip0[0]), STORE); |
| } |
| |
| pi0 = to_next[0] = from[0]; |
| pi1 = to_next[1] = from[1]; |
| |
| from += 2; |
| n_left_from -= 2; |
| to_next += 2; |
| n_left_to_next -= 2; |
| |
| p0 = vlib_get_buffer (vm, pi0); |
| p1 = vlib_get_buffer (vm, pi1); |
| |
| ip0 = vlib_buffer_get_current (p0); |
| ip1 = vlib_buffer_get_current (p1); |
| lbi0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX]; |
| lbi1 = vnet_buffer (p1)->ip.adj_index[VLIB_TX]; |
| |
| lb0 = load_balance_get (lbi0); |
| lb1 = load_balance_get (lbi1); |
| |
| /* |
| * this node is for via FIBs we can re-use the hash value from the |
| * to node if present. |
| * We don't want to use the same hash value at each level in the recursion |
| * graph as that would lead to polarisation |
| */ |
| hc0 = hc1 = 0; |
| |
| if (PREDICT_FALSE (lb0->lb_n_buckets > 1)) |
| { |
| if (PREDICT_TRUE (vnet_buffer (p0)->ip.flow_hash)) |
| { |
| hc0 = vnet_buffer (p0)->ip.flow_hash = |
| vnet_buffer (p0)->ip.flow_hash >> 1; |
| } |
| else |
| { |
| hc0 = vnet_buffer (p0)->ip.flow_hash = |
| ip4_compute_flow_hash (ip0, lb0->lb_hash_config); |
| } |
| dpo0 = load_balance_get_fwd_bucket |
| (lb0, (hc0 & (lb0->lb_n_buckets_minus_1))); |
| } |
| else |
| { |
| dpo0 = load_balance_get_bucket_i (lb0, 0); |
| } |
| if (PREDICT_FALSE (lb1->lb_n_buckets > 1)) |
| { |
| if (PREDICT_TRUE (vnet_buffer (p1)->ip.flow_hash)) |
| { |
| hc1 = vnet_buffer (p1)->ip.flow_hash = |
| vnet_buffer (p1)->ip.flow_hash >> 1; |
| } |
| else |
| { |
| hc1 = vnet_buffer (p1)->ip.flow_hash = |
| ip4_compute_flow_hash (ip1, lb1->lb_hash_config); |
| } |
| dpo1 = load_balance_get_fwd_bucket |
| (lb1, (hc1 & (lb1->lb_n_buckets_minus_1))); |
| } |
| else |
| { |
| dpo1 = load_balance_get_bucket_i (lb1, 0); |
| } |
| |
| next0 = dpo0->dpoi_next_node; |
| next1 = dpo1->dpoi_next_node; |
| |
| vnet_buffer (p0)->ip.adj_index[VLIB_TX] = dpo0->dpoi_index; |
| vnet_buffer (p1)->ip.adj_index[VLIB_TX] = dpo1->dpoi_index; |
| |
| vlib_increment_combined_counter |
| (cm, thread_index, lbi0, 1, vlib_buffer_length_in_chain (vm, p0)); |
| vlib_increment_combined_counter |
| (cm, thread_index, lbi1, 1, vlib_buffer_length_in_chain (vm, p1)); |
| |
| vlib_validate_buffer_enqueue_x2 (vm, node, next, |
| to_next, n_left_to_next, |
| pi0, pi1, next0, next1); |
| } |
| |
| while (n_left_from > 0 && n_left_to_next > 0) |
| { |
| ip_lookup_next_t next0; |
| const load_balance_t *lb0; |
| vlib_buffer_t *p0; |
| u32 pi0, lbi0, hc0; |
| const ip4_header_t *ip0; |
| const dpo_id_t *dpo0; |
| |
| pi0 = from[0]; |
| to_next[0] = pi0; |
| from += 1; |
| to_next += 1; |
| n_left_to_next -= 1; |
| n_left_from -= 1; |
| |
| p0 = vlib_get_buffer (vm, pi0); |
| |
| ip0 = vlib_buffer_get_current (p0); |
| lbi0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX]; |
| |
| lb0 = load_balance_get (lbi0); |
| |
| hc0 = 0; |
| if (PREDICT_FALSE (lb0->lb_n_buckets > 1)) |
| { |
| if (PREDICT_TRUE (vnet_buffer (p0)->ip.flow_hash)) |
| { |
| hc0 = vnet_buffer (p0)->ip.flow_hash = |
| vnet_buffer (p0)->ip.flow_hash >> 1; |
| } |
| else |
| { |
| hc0 = vnet_buffer (p0)->ip.flow_hash = |
| ip4_compute_flow_hash (ip0, lb0->lb_hash_config); |
| } |
| dpo0 = load_balance_get_fwd_bucket |
| (lb0, (hc0 & (lb0->lb_n_buckets_minus_1))); |
| } |
| else |
| { |
| dpo0 = load_balance_get_bucket_i (lb0, 0); |
| } |
| |
| next0 = dpo0->dpoi_next_node; |
| vnet_buffer (p0)->ip.adj_index[VLIB_TX] = dpo0->dpoi_index; |
| |
| vlib_increment_combined_counter |
| (cm, thread_index, lbi0, 1, vlib_buffer_length_in_chain (vm, p0)); |
| |
| vlib_validate_buffer_enqueue_x1 (vm, node, next, |
| to_next, n_left_to_next, |
| pi0, next0); |
| } |
| |
| vlib_put_next_frame (vm, node, next, n_left_to_next); |
| } |
| |
| if (node->flags & VLIB_NODE_FLAG_TRACE) |
| ip4_forward_next_trace (vm, node, frame, VLIB_TX); |
| |
| return frame->n_vectors; |
| } |
| |
| /* *INDENT-OFF* */ |
| VLIB_REGISTER_NODE (ip4_load_balance_node) = |
| { |
| .name = "ip4-load-balance", |
| .vector_size = sizeof (u32), |
| .sibling_of = "ip4-lookup", |
| .format_trace = format_ip4_lookup_trace, |
| }; |
| /* *INDENT-ON* */ |
| |
| #ifndef CLIB_MARCH_VARIANT |
| /* get first interface address */ |
| ip4_address_t * |
| ip4_interface_first_address (ip4_main_t * im, u32 sw_if_index, |
| ip_interface_address_t ** result_ia) |
| { |
| ip_lookup_main_t *lm = &im->lookup_main; |
| ip_interface_address_t *ia = 0; |
| ip4_address_t *result = 0; |
| |
| /* *INDENT-OFF* */ |
| foreach_ip_interface_address |
| (lm, ia, sw_if_index, |
| 1 /* honor unnumbered */ , |
| ({ |
| ip4_address_t * a = |
| ip_interface_address_get_address (lm, ia); |
| result = a; |
| break; |
| })); |
| /* *INDENT-OFF* */ |
| if (result_ia) |
| *result_ia = result ? ia : 0; |
| return result; |
| } |
| |
| static void |
| ip4_add_subnet_bcast_route (u32 fib_index, |
| fib_prefix_t *pfx, |
| u32 sw_if_index) |
| { |
| vnet_sw_interface_flags_t iflags; |
| |
| iflags = vnet_sw_interface_get_flags(vnet_get_main(), sw_if_index); |
| |
| fib_table_entry_special_remove(fib_index, |
| pfx, |
| FIB_SOURCE_INTERFACE); |
| |
| if (iflags & VNET_SW_INTERFACE_FLAG_DIRECTED_BCAST) |
| { |
| fib_table_entry_update_one_path (fib_index, pfx, |
| FIB_SOURCE_INTERFACE, |
| FIB_ENTRY_FLAG_NONE, |
| DPO_PROTO_IP4, |
| /* No next-hop address */ |
| &ADJ_BCAST_ADDR, |
| sw_if_index, |
| // invalid FIB index |
| ~0, |
| 1, |
| // no out-label stack |
| NULL, |
| FIB_ROUTE_PATH_FLAG_NONE); |
| } |
| else |
| { |
| fib_table_entry_special_add(fib_index, |
| pfx, |
| FIB_SOURCE_INTERFACE, |
| (FIB_ENTRY_FLAG_DROP | |
| FIB_ENTRY_FLAG_LOOSE_URPF_EXEMPT)); |
| } |
| } |
| |
| static void |
| ip4_add_interface_routes (u32 sw_if_index, |
| ip4_main_t * im, u32 fib_index, |
| ip_interface_address_t * a) |
| { |
| ip_lookup_main_t *lm = &im->lookup_main; |
| ip4_address_t *address = ip_interface_address_get_address (lm, a); |
| fib_prefix_t pfx = { |
| .fp_len = a->address_length, |
| .fp_proto = FIB_PROTOCOL_IP4, |
| .fp_addr.ip4 = *address, |
| }; |
| |
| if (pfx.fp_len <= 30) |
| { |
| /* a /30 or shorter - add a glean for the network address */ |
| fib_table_entry_update_one_path (fib_index, &pfx, |
| FIB_SOURCE_INTERFACE, |
| (FIB_ENTRY_FLAG_CONNECTED | |
| FIB_ENTRY_FLAG_ATTACHED), |
| DPO_PROTO_IP4, |
| /* No next-hop address */ |
| NULL, |
| sw_if_index, |
| // invalid FIB index |
| ~0, |
| 1, |
| // no out-label stack |
| NULL, |
| FIB_ROUTE_PATH_FLAG_NONE); |
| |
| /* Add the two broadcast addresses as drop */ |
| fib_prefix_t net_pfx = { |
| .fp_len = 32, |
| .fp_proto = FIB_PROTOCOL_IP4, |
| .fp_addr.ip4.as_u32 = address->as_u32 & im->fib_masks[pfx.fp_len], |
| }; |
| if (net_pfx.fp_addr.ip4.as_u32 != pfx.fp_addr.ip4.as_u32) |
| fib_table_entry_special_add(fib_index, |
| &net_pfx, |
| FIB_SOURCE_INTERFACE, |
| (FIB_ENTRY_FLAG_DROP | |
| FIB_ENTRY_FLAG_LOOSE_URPF_EXEMPT)); |
| net_pfx.fp_addr.ip4.as_u32 |= ~im->fib_masks[pfx.fp_len]; |
| if (net_pfx.fp_addr.ip4.as_u32 != pfx.fp_addr.ip4.as_u32) |
| ip4_add_subnet_bcast_route(fib_index, &net_pfx, sw_if_index); |
| } |
| else if (pfx.fp_len == 31) |
| { |
| u32 mask = clib_host_to_net_u32(1); |
| fib_prefix_t net_pfx = pfx; |
| |
| net_pfx.fp_len = 32; |
| net_pfx.fp_addr.ip4.as_u32 ^= mask; |
| |
| /* a /31 - add the other end as an attached host */ |
| fib_table_entry_update_one_path (fib_index, &net_pfx, |
| FIB_SOURCE_INTERFACE, |
| (FIB_ENTRY_FLAG_ATTACHED), |
| DPO_PROTO_IP4, |
| &net_pfx.fp_addr, |
| sw_if_index, |
| // invalid FIB index |
| ~0, |
| 1, |
| NULL, |
| FIB_ROUTE_PATH_FLAG_NONE); |
| } |
| pfx.fp_len = 32; |
| |
| if (sw_if_index < vec_len (lm->classify_table_index_by_sw_if_index)) |
| { |
| u32 classify_table_index = |
| lm->classify_table_index_by_sw_if_index[sw_if_index]; |
| if (classify_table_index != (u32) ~ 0) |
| { |
| dpo_id_t dpo = DPO_INVALID; |
| |
| dpo_set (&dpo, |
| DPO_CLASSIFY, |
| DPO_PROTO_IP4, |
| classify_dpo_create (DPO_PROTO_IP4, classify_table_index)); |
| |
| fib_table_entry_special_dpo_add (fib_index, |
| &pfx, |
| FIB_SOURCE_CLASSIFY, |
| FIB_ENTRY_FLAG_NONE, &dpo); |
| dpo_reset (&dpo); |
| } |
| } |
| |
| fib_table_entry_update_one_path (fib_index, &pfx, |
| FIB_SOURCE_INTERFACE, |
| (FIB_ENTRY_FLAG_CONNECTED | |
| FIB_ENTRY_FLAG_LOCAL), |
| DPO_PROTO_IP4, |
| &pfx.fp_addr, |
| sw_if_index, |
| // invalid FIB index |
| ~0, |
| 1, NULL, |
| FIB_ROUTE_PATH_FLAG_NONE); |
| } |
| |
| static void |
| ip4_del_interface_routes (ip4_main_t * im, |
| u32 fib_index, |
| ip4_address_t * address, u32 address_length) |
| { |
| fib_prefix_t pfx = { |
| .fp_len = address_length, |
| .fp_proto = FIB_PROTOCOL_IP4, |
| .fp_addr.ip4 = *address, |
| }; |
| |
| if (pfx.fp_len <= 30) |
| { |
| fib_prefix_t net_pfx = { |
| .fp_len = 32, |
| .fp_proto = FIB_PROTOCOL_IP4, |
| .fp_addr.ip4.as_u32 = address->as_u32 & im->fib_masks[pfx.fp_len], |
| }; |
| if (net_pfx.fp_addr.ip4.as_u32 != pfx.fp_addr.ip4.as_u32) |
| fib_table_entry_special_remove(fib_index, |
| &net_pfx, |
| FIB_SOURCE_INTERFACE); |
| net_pfx.fp_addr.ip4.as_u32 |= ~im->fib_masks[pfx.fp_len]; |
| if (net_pfx.fp_addr.ip4.as_u32 != pfx.fp_addr.ip4.as_u32) |
| fib_table_entry_special_remove(fib_index, |
| &net_pfx, |
| FIB_SOURCE_INTERFACE); |
| fib_table_entry_delete (fib_index, &pfx, FIB_SOURCE_INTERFACE); |
| } |
| else if (pfx.fp_len == 31) |
| { |
| u32 mask = clib_host_to_net_u32(1); |
| fib_prefix_t net_pfx = pfx; |
| |
| net_pfx.fp_len = 32; |
| net_pfx.fp_addr.ip4.as_u32 ^= mask; |
| |
| fib_table_entry_delete (fib_index, &net_pfx, FIB_SOURCE_INTERFACE); |
| } |
| |
| pfx.fp_len = 32; |
| fib_table_entry_delete (fib_index, &pfx, FIB_SOURCE_INTERFACE); |
| } |
| |
| void |
| ip4_sw_interface_enable_disable (u32 sw_if_index, u32 is_enable) |
| { |
| ip4_main_t *im = &ip4_main; |
| |
| vec_validate_init_empty (im->ip_enabled_by_sw_if_index, sw_if_index, 0); |
| |
| /* |
| * enable/disable only on the 1<->0 transition |
| */ |
| if (is_enable) |
| { |
| if (1 != ++im->ip_enabled_by_sw_if_index[sw_if_index]) |
| return; |
| } |
| else |
| { |
| ASSERT (im->ip_enabled_by_sw_if_index[sw_if_index] > 0); |
| if (0 != --im->ip_enabled_by_sw_if_index[sw_if_index]) |
| return; |
| } |
| vnet_feature_enable_disable ("ip4-unicast", "ip4-not-enabled", sw_if_index, |
| !is_enable, 0, 0); |
| |
| |
| vnet_feature_enable_disable ("ip4-multicast", "ip4-not-enabled", |
| sw_if_index, !is_enable, 0, 0); |
| } |
| |
| static clib_error_t * |
| ip4_add_del_interface_address_internal (vlib_main_t * vm, |
| u32 sw_if_index, |
| ip4_address_t * address, |
| u32 address_length, u32 is_del) |
| { |
| vnet_main_t *vnm = vnet_get_main (); |
| ip4_main_t *im = &ip4_main; |
| ip_lookup_main_t *lm = &im->lookup_main; |
| clib_error_t *error = 0; |
| u32 if_address_index, elts_before; |
| ip4_address_fib_t ip4_af, *addr_fib = 0; |
| |
| /* local0 interface doesn't support IP addressing */ |
| if (sw_if_index == 0) |
| { |
| return |
| clib_error_create ("local0 interface doesn't support IP addressing"); |
| } |
| |
| vec_validate (im->fib_index_by_sw_if_index, sw_if_index); |
| ip4_addr_fib_init (&ip4_af, address, |
| vec_elt (im->fib_index_by_sw_if_index, sw_if_index)); |
| vec_add1 (addr_fib, ip4_af); |
| |
| /* |
| * there is no support for adj-fib handling in the presence of overlapping |
| * subnets on interfaces. Easy fix - disallow overlapping subnets, like |
| * most routers do. |
| */ |
| /* *INDENT-OFF* */ |
| if (!is_del) |
| { |
| /* When adding an address check that it does not conflict |
| with an existing address on any interface in this table. */ |
| ip_interface_address_t *ia; |
| vnet_sw_interface_t *sif; |
| |
| pool_foreach(sif, vnm->interface_main.sw_interfaces, |
| ({ |
| if (im->fib_index_by_sw_if_index[sw_if_index] == |
| im->fib_index_by_sw_if_index[sif->sw_if_index]) |
| { |
| foreach_ip_interface_address |
| (&im->lookup_main, ia, sif->sw_if_index, |
| 0 /* honor unnumbered */ , |
| ({ |
| ip4_address_t * x = |
| ip_interface_address_get_address |
| (&im->lookup_main, ia); |
| if (ip4_destination_matches_route |
| (im, address, x, ia->address_length) || |
| ip4_destination_matches_route (im, |
| x, |
| address, |
| address_length)) |
| { |
| vnm->api_errno = VNET_API_ERROR_DUPLICATE_IF_ADDRESS; |
| |
| return |
| clib_error_create |
| ("failed to add %U which conflicts with %U for interface %U", |
| format_ip4_address_and_length, address, |
| address_length, |
| format_ip4_address_and_length, x, |
| ia->address_length, |
| format_vnet_sw_if_index_name, vnm, |
| sif->sw_if_index); |
| } |
| })); |
| } |
| })); |
| } |
| /* *INDENT-ON* */ |
| |
| elts_before = pool_elts (lm->if_address_pool); |
| |
| error = ip_interface_address_add_del |
| (lm, sw_if_index, addr_fib, address_length, is_del, &if_address_index); |
| if (error) |
| goto done; |
| |
| ip4_sw_interface_enable_disable (sw_if_index, !is_del); |
| |
| if (is_del) |
| ip4_del_interface_routes (im, ip4_af.fib_index, address, address_length); |
| else |
| ip4_add_interface_routes (sw_if_index, |
| im, ip4_af.fib_index, |
| pool_elt_at_index |
| (lm->if_address_pool, if_address_index)); |
| |
| /* If pool did not grow/shrink: add duplicate address. */ |
| if (elts_before != pool_elts (lm->if_address_pool)) |
| { |
| ip4_add_del_interface_address_callback_t *cb; |
| vec_foreach (cb, im->add_del_interface_address_callbacks) |
| cb->function (im, cb->function_opaque, sw_if_index, |
| address, address_length, if_address_index, is_del); |
| } |
| |
| done: |
| vec_free (addr_fib); |
| return error; |
| } |
| |
| clib_error_t * |
| ip4_add_del_interface_address (vlib_main_t * vm, |
| u32 sw_if_index, |
| ip4_address_t * address, |
| u32 address_length, u32 is_del) |
| { |
| return ip4_add_del_interface_address_internal |
| (vm, sw_if_index, address, address_length, is_del); |
| } |
| |
| void |
| ip4_directed_broadcast (u32 sw_if_index, u8 enable) |
| { |
| ip_interface_address_t *ia; |
| ip4_main_t *im; |
| |
| im = &ip4_main; |
| |
| /* |
| * when directed broadcast is enabled, the subnet braodcast route will forward |
| * packets using an adjacency with a broadcast MAC. otherwise it drops |
| */ |
| /* *INDENT-OFF* */ |
| foreach_ip_interface_address(&im->lookup_main, ia, |
| sw_if_index, 0, |
| ({ |
| if (ia->address_length <= 30) |
| { |
| ip4_address_t *ipa; |
| |
| ipa = ip_interface_address_get_address (&im->lookup_main, ia); |
| |
| fib_prefix_t pfx = { |
| .fp_len = 32, |
| .fp_proto = FIB_PROTOCOL_IP4, |
| .fp_addr = { |
| .ip4.as_u32 = (ipa->as_u32 | ~im->fib_masks[ia->address_length]), |
| }, |
| }; |
| |
| ip4_add_subnet_bcast_route |
| (fib_table_get_index_for_sw_if_index(FIB_PROTOCOL_IP4, |
| sw_if_index), |
| &pfx, sw_if_index); |
| } |
| })); |
| /* *INDENT-ON* */ |
| } |
| #endif |
| |
| /* Built-in ip4 unicast rx feature path definition */ |
| /* *INDENT-OFF* */ |
| VNET_FEATURE_ARC_INIT (ip4_unicast, static) = |
| { |
| .arc_name = "ip4-unicast", |
| .start_nodes = VNET_FEATURES ("ip4-input", "ip4-input-no-checksum"), |
| .last_in_arc = "ip4-lookup", |
| .arc_index_ptr = &ip4_main.lookup_main.ucast_feature_arc_index, |
| }; |
| |
| VNET_FEATURE_INIT (ip4_flow_classify, static) = |
| { |
| .arc_name = "ip4-unicast", |
| .node_name = "ip4-flow-classify", |
| .runs_before = VNET_FEATURES ("ip4-inacl"), |
| }; |
| |
| VNET_FEATURE_INIT (ip4_inacl, static) = |
| { |
| .arc_name = "ip4-unicast", |
| .node_name = "ip4-inacl", |
| .runs_before = VNET_FEATURES ("ip4-source-check-via-rx"), |
| }; |
| |
| VNET_FEATURE_INIT (ip4_source_check_1, static) = |
| { |
| .arc_name = "ip4-unicast", |
| .node_name = "ip4-source-check-via-rx", |
| .runs_before = VNET_FEATURES ("ip4-source-check-via-any"), |
| }; |
| |
| VNET_FEATURE_INIT (ip4_source_check_2, static) = |
| { |
| .arc_name = "ip4-unicast", |
| .node_name = "ip4-source-check-via-any", |
| .runs_before = VNET_FEATURES ("ip4-policer-classify"), |
| }; |
| |
| VNET_FEATURE_INIT (ip4_source_and_port_range_check_rx, static) = |
| { |
| .arc_name = "ip4-unicast", |
| .node_name = "ip4-source-and-port-range-check-rx", |
| .runs_before = VNET_FEATURES ("ip4-policer-classify"), |
| }; |
| |
| VNET_FEATURE_INIT (ip4_policer_classify, static) = |
| { |
| .arc_name = "ip4-unicast", |
| .node_name = "ip4-policer-classify", |
| .runs_before = VNET_FEATURES ("ipsec4-input-feature"), |
| }; |
| |
| VNET_FEATURE_INIT (ip4_ipsec, static) = |
| { |
| .arc_name = "ip4-unicast", |
| .node_name = "ipsec4-input-feature", |
| .runs_before = VNET_FEATURES ("vpath-input-ip4"), |
| }; |
| |
| VNET_FEATURE_INIT (ip4_vpath, static) = |
| { |
| .arc_name = "ip4-unicast", |
| .node_name = "vpath-input-ip4", |
| .runs_before = VNET_FEATURES ("ip4-vxlan-bypass"), |
| }; |
| |
| VNET_FEATURE_INIT (ip4_vxlan_bypass, static) = |
| { |
| .arc_name = "ip4-unicast", |
| .node_name = "ip4-vxlan-bypass", |
| .runs_before = VNET_FEATURES ("ip4-lookup"), |
| }; |
| |
| VNET_FEATURE_INIT (ip4_not_enabled, static) = |
| { |
| .arc_name = "ip4-unicast", |
| .node_name = "ip4-not-enabled", |
| .runs_before = VNET_FEATURES ("ip4-lookup"), |
| }; |
| |
| VNET_FEATURE_INIT (ip4_lookup, static) = |
| { |
| .arc_name = "ip4-unicast", |
| .node_name = "ip4-lookup", |
| .runs_before = 0, /* not before any other features */ |
| }; |
| |
| /* Built-in ip4 multicast rx feature path definition */ |
| VNET_FEATURE_ARC_INIT (ip4_multicast, static) = |
| { |
| .arc_name = "ip4-multicast", |
| .start_nodes = VNET_FEATURES ("ip4-input", "ip4-input-no-checksum"), |
| .last_in_arc = "ip4-mfib-forward-lookup", |
| .arc_index_ptr = &ip4_main.lookup_main.mcast_feature_arc_index, |
| }; |
| |
| VNET_FEATURE_INIT (ip4_vpath_mc, static) = |
| { |
| .arc_name = "ip4-multicast", |
| .node_name = "vpath-input-ip4", |
| .runs_before = VNET_FEATURES ("ip4-mfib-forward-lookup"), |
| }; |
| |
| VNET_FEATURE_INIT (ip4_mc_not_enabled, static) = |
| { |
| .arc_name = "ip4-multicast", |
| .node_name = "ip4-not-enabled", |
| .runs_before = VNET_FEATURES ("ip4-mfib-forward-lookup"), |
| }; |
| |
| VNET_FEATURE_INIT (ip4_lookup_mc, static) = |
| { |
| .arc_name = "ip4-multicast", |
| .node_name = "ip4-mfib-forward-lookup", |
| .runs_before = 0, /* last feature */ |
| }; |
| |
| /* Source and port-range check ip4 tx feature path definition */ |
| VNET_FEATURE_ARC_INIT (ip4_output, static) = |
| { |
| .arc_name = "ip4-output", |
| .start_nodes = VNET_FEATURES ("ip4-rewrite", "ip4-midchain", "ip4-dvr-dpo"), |
| .last_in_arc = "interface-output", |
| .arc_index_ptr = &ip4_main.lookup_main.output_feature_arc_index, |
| }; |
| |
| VNET_FEATURE_INIT (ip4_source_and_port_range_check_tx, static) = |
| { |
| .arc_name = "ip4-output", |
| .node_name = "ip4-source-and-port-range-check-tx", |
| .runs_before = VNET_FEATURES ("ip4-outacl"), |
| }; |
| |
| VNET_FEATURE_INIT (ip4_outacl, static) = |
| { |
| .arc_name = "ip4-output", |
| .node_name = "ip4-outacl", |
| .runs_before = VNET_FEATURES ("ipsec4-output-feature"), |
| }; |
| |
| VNET_FEATURE_INIT (ip4_ipsec_output, static) = |
| { |
| .arc_name = "ip4-output", |
| .node_name = "ipsec4-output-feature", |
| .runs_before = VNET_FEATURES ("interface-output"), |
| }; |
| |
| /* Built-in ip4 tx feature path definition */ |
| VNET_FEATURE_INIT (ip4_interface_output, static) = |
| { |
| .arc_name = "ip4-output", |
| .node_name = "interface-output", |
| .runs_before = 0, /* not before any other features */ |
| }; |
| /* *INDENT-ON* */ |
| |
| static clib_error_t * |
| ip4_sw_interface_add_del (vnet_main_t * vnm, u32 sw_if_index, u32 is_add) |
| { |
| ip4_main_t *im = &ip4_main; |
| |
| /* Fill in lookup tables with default table (0). */ |
| vec_validate (im->fib_index_by_sw_if_index, sw_if_index); |
| vec_validate (im->mfib_index_by_sw_if_index, sw_if_index); |
| |
| if (!is_add) |
| { |
| ip4_main_t *im4 = &ip4_main; |
| ip_lookup_main_t *lm4 = &im4->lookup_main; |
| ip_interface_address_t *ia = 0; |
| ip4_address_t *address; |
| vlib_main_t *vm = vlib_get_main (); |
| |
| vnet_sw_interface_update_unnumbered (sw_if_index, ~0, 0); |
| /* *INDENT-OFF* */ |
| foreach_ip_interface_address (lm4, ia, sw_if_index, 0, |
| ({ |
| address = ip_interface_address_get_address (lm4, ia); |
| ip4_add_del_interface_address(vm, sw_if_index, address, ia->address_length, 1); |
| })); |
| /* *INDENT-ON* */ |
| } |
| |
| vnet_feature_enable_disable ("ip4-unicast", "ip4-not-enabled", sw_if_index, |
| is_add, 0, 0); |
| |
| vnet_feature_enable_disable ("ip4-multicast", "ip4-not-enabled", |
| sw_if_index, is_add, 0, 0); |
| |
| return /* no error */ 0; |
| } |
| |
| VNET_SW_INTERFACE_ADD_DEL_FUNCTION (ip4_sw_interface_add_del); |
| |
| /* Global IP4 main. */ |
| ip4_main_t ip4_main; |
| |
| static clib_error_t * |
| ip4_lookup_init (vlib_main_t * vm) |
| { |
| ip4_main_t *im = &ip4_main; |
| clib_error_t *error; |
| uword i; |
| |
| if ((error = vlib_call_init_function (vm, vnet_feature_init))) |
| return error; |
| if ((error = vlib_call_init_function (vm, ip4_mtrie_module_init))) |
| return (error); |
| if ((error = vlib_call_init_function (vm, fib_module_init))) |
| return error; |
| if ((error = vlib_call_init_function (vm, mfib_module_init))) |
| return error; |
| |
| for (i = 0; i < ARRAY_LEN (im->fib_masks); i++) |
| { |
| u32 m; |
| |
| if (i < 32) |
| m = pow2_mask (i) << (32 - i); |
| else |
| m = ~0; |
| im->fib_masks[i] = clib_host_to_net_u32 (m); |
| } |
| |
| ip_lookup_init (&im->lookup_main, /* is_ip6 */ 0); |
| |
| /* Create FIB with index 0 and table id of 0. */ |
| fib_table_find_or_create_and_lock (FIB_PROTOCOL_IP4, 0, |
| FIB_SOURCE_DEFAULT_ROUTE); |
| mfib_table_find_or_create_and_lock (FIB_PROTOCOL_IP4, 0, |
| MFIB_SOURCE_DEFAULT_ROUTE); |
| |
| { |
| pg_node_t *pn; |
| pn = pg_get_node (ip4_lookup_node.index); |
| pn->unformat_edit = unformat_pg_ip4_header; |
| } |
| |
| { |
| ethernet_arp_header_t h; |
| |
| clib_memset (&h, 0, sizeof (h)); |
| |
| #define _16(f,v) h.f = clib_host_to_net_u16 (v); |
| #define _8(f,v) h.f = v; |
| _16 (l2_type, ETHERNET_ARP_HARDWARE_TYPE_ethernet); |
| _16 (l3_type, ETHERNET_TYPE_IP4); |
| _8 (n_l2_address_bytes, 6); |
| _8 (n_l3_address_bytes, 4); |
| _16 (opcode, ETHERNET_ARP_OPCODE_request); |
| #undef _16 |
| #undef _8 |
| |
| vlib_packet_template_init (vm, &im->ip4_arp_request_packet_template, |
| /* data */ &h, |
| sizeof (h), |
| /* alloc chunk size */ 8, |
| "ip4 arp"); |
| } |
| |
| return error; |
| } |
| |
| VLIB_INIT_FUNCTION (ip4_lookup_init); |
| |
| typedef struct |
| { |
| /* Adjacency taken. */ |
| u32 dpo_index; |
| u32 flow_hash; |
| u32 fib_index; |
| |
| /* Packet data, possibly *after* rewrite. */ |
| u8 packet_data[64 - 1 * sizeof (u32)]; |
| } |
| ip4_forward_next_trace_t; |
| |
| #ifndef CLIB_MARCH_VARIANT |
| u8 * |
| format_ip4_forward_next_trace (u8 * s, va_list * args) |
| { |
| CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *); |
| CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *); |
| ip4_forward_next_trace_t *t = va_arg (*args, ip4_forward_next_trace_t *); |
| u32 indent = format_get_indent (s); |
| s = format (s, "%U%U", |
| format_white_space, indent, |
| format_ip4_header, t->packet_data, sizeof (t->packet_data)); |
| return s; |
| } |
| #endif |
| |
| static u8 * |
| format_ip4_lookup_trace (u8 * s, va_list * args) |
| { |
| CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *); |
| CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *); |
| ip4_forward_next_trace_t *t = va_arg (*args, ip4_forward_next_trace_t *); |
| u32 indent = format_get_indent (s); |
| |
| s = format (s, "fib %d dpo-idx %d flow hash: 0x%08x", |
| t->fib_index, t->dpo_index, t->flow_hash); |
| s = format (s, "\n%U%U", |
| format_white_space, indent, |
| format_ip4_header, t->packet_data, sizeof (t->packet_data)); |
| return s; |
| } |
| |
| static u8 * |
| format_ip4_rewrite_trace (u8 * s, va_list * args) |
| { |
| CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *); |
| CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *); |
| ip4_forward_next_trace_t *t = va_arg (*args, ip4_forward_next_trace_t *); |
| u32 indent = format_get_indent (s); |
| |
| s = format (s, "tx_sw_if_index %d dpo-idx %d : %U flow hash: 0x%08x", |
| t->fib_index, t->dpo_index, format_ip_adjacency, |
| t->dpo_index, FORMAT_IP_ADJACENCY_NONE, t->flow_hash); |
| s = format (s, "\n%U%U", |
| format_white_space, indent, |
| format_ip_adjacency_packet_data, |
| t->dpo_index, t->packet_data, sizeof (t->packet_data)); |
| return s; |
| } |
| |
| #ifndef CLIB_MARCH_VARIANT |
| /* Common trace function for all ip4-forward next nodes. */ |
| void |
| ip4_forward_next_trace (vlib_main_t * vm, |
| vlib_node_runtime_t * node, |
| vlib_frame_t * frame, vlib_rx_or_tx_t which_adj_index) |
| { |
| u32 *from, n_left; |
| ip4_main_t *im = &ip4_main; |
| |
| n_left = frame->n_vectors; |
| from = vlib_frame_vector_args (frame); |
| |
| while (n_left >= 4) |
| { |
| u32 bi0, bi1; |
| vlib_buffer_t *b0, *b1; |
| ip4_forward_next_trace_t *t0, *t1; |
| |
| /* Prefetch next iteration. */ |
| vlib_prefetch_buffer_with_index (vm, from[2], LOAD); |
| vlib_prefetch_buffer_with_index (vm, from[3], LOAD); |
| |
| bi0 = from[0]; |
| bi1 = from[1]; |
| |
| b0 = vlib_get_buffer (vm, bi0); |
| b1 = vlib_get_buffer (vm, bi1); |
| |
| if (b0->flags & VLIB_BUFFER_IS_TRACED) |
| { |
| t0 = vlib_add_trace (vm, node, b0, sizeof (t0[0])); |
| t0->dpo_index = vnet_buffer (b0)->ip.adj_index[which_adj_index]; |
| t0->flow_hash = vnet_buffer (b0)->ip.flow_hash; |
| t0->fib_index = |
| (vnet_buffer (b0)->sw_if_index[VLIB_TX] != |
| (u32) ~ 0) ? vnet_buffer (b0)->sw_if_index[VLIB_TX] : |
| vec_elt (im->fib_index_by_sw_if_index, |
| vnet_buffer (b0)->sw_if_index[VLIB_RX]); |
| |
| clib_memcpy_fast (t0->packet_data, |
| vlib_buffer_get_current (b0), |
| sizeof (t0->packet_data)); |
| } |
| if (b1->flags & VLIB_BUFFER_IS_TRACED) |
| { |
| t1 = vlib_add_trace (vm, node, b1, sizeof (t1[0])); |
| t1->dpo_index = vnet_buffer (b1)->ip.adj_index[which_adj_index]; |
| t1->flow_hash = vnet_buffer (b1)->ip.flow_hash; |
| t1->fib_index = |
| (vnet_buffer (b1)->sw_if_index[VLIB_TX] != |
| (u32) ~ 0) ? vnet_buffer (b1)->sw_if_index[VLIB_TX] : |
| vec_elt (im->fib_index_by_sw_if_index, |
| vnet_buffer (b1)->sw_if_index[VLIB_RX]); |
| clib_memcpy_fast (t1->packet_data, vlib_buffer_get_current (b1), |
| sizeof (t1->packet_data)); |
| } |
| from += 2; |
| n_left -= 2; |
| } |
| |
| while (n_left >= 1) |
| { |
| u32 bi0; |
| vlib_buffer_t *b0; |
| ip4_forward_next_trace_t *t0; |
| |
| bi0 = from[0]; |
| |
| b0 = vlib_get_buffer (vm, bi0); |
| |
| if (b0->flags & VLIB_BUFFER_IS_TRACED) |
| { |
| t0 = vlib_add_trace (vm, node, b0, sizeof (t0[0])); |
| t0->dpo_index = vnet_buffer (b0)->ip.adj_index[which_adj_index]; |
| t0->flow_hash = vnet_buffer (b0)->ip.flow_hash; |
| t0->fib_index = |
| (vnet_buffer (b0)->sw_if_index[VLIB_TX] != |
| (u32) ~ 0) ? vnet_buffer (b0)->sw_if_index[VLIB_TX] : |
| vec_elt (im->fib_index_by_sw_if_index, |
| vnet_buffer (b0)->sw_if_index[VLIB_RX]); |
| clib_memcpy_fast (t0->packet_data, vlib_buffer_get_current (b0), |
| sizeof (t0->packet_data)); |
| } |
| from += 1; |
| n_left -= 1; |
| } |
| } |
| |
| /* Compute TCP/UDP/ICMP4 checksum in software. */ |
| u16 |
| ip4_tcp_udp_compute_checksum (vlib_main_t * vm, vlib_buffer_t * p0, |
| ip4_header_t * ip0) |
| { |
| ip_csum_t sum0; |
| u32 ip_header_length, payload_length_host_byte_order; |
| u32 n_this_buffer, n_bytes_left, n_ip_bytes_this_buffer; |
| u16 sum16; |
| void *data_this_buffer; |
| |
| /* Initialize checksum with ip header. */ |
| ip_header_length = ip4_header_bytes (ip0); |
| payload_length_host_byte_order = |
| clib_net_to_host_u16 (ip0->length) - ip_header_length; |
| sum0 = |
| clib_host_to_net_u32 (payload_length_host_byte_order + |
| (ip0->protocol << 16)); |
| |
| if (BITS (uword) == 32) |
| { |
| sum0 = |
| ip_csum_with_carry (sum0, |
| clib_mem_unaligned (&ip0->src_address, u32)); |
| sum0 = |
| ip_csum_with_carry (sum0, |
| clib_mem_unaligned (&ip0->dst_address, u32)); |
| } |
| else |
| sum0 = |
| ip_csum_with_carry (sum0, clib_mem_unaligned (&ip0->src_address, u64)); |
| |
| n_bytes_left = n_this_buffer = payload_length_host_byte_order; |
| data_this_buffer = (void *) ip0 + ip_header_length; |
| n_ip_bytes_this_buffer = |
| p0->current_length - (((u8 *) ip0 - p0->data) - p0->current_data); |
| if (n_this_buffer + ip_header_length > n_ip_bytes_this_buffer) |
| { |
| n_this_buffer = n_ip_bytes_this_buffer > ip_header_length ? |
| n_ip_bytes_this_buffer - ip_header_length : 0; |
| } |
| while (1) |
| { |
| sum0 = ip_incremental_checksum (sum0, data_this_buffer, n_this_buffer); |
| n_bytes_left -= n_this_buffer; |
| if (n_bytes_left == 0) |
| break; |
| |
| ASSERT (p0->flags & VLIB_BUFFER_NEXT_PRESENT); |
| p0 = vlib_get_buffer (vm, p0->next_buffer); |
| data_this_buffer = vlib_buffer_get_current (p0); |
| n_this_buffer = p0->current_length; |
| } |
| |
| sum16 = ~ip_csum_fold (sum0); |
| |
| return sum16; |
| } |
| |
| u32 |
| ip4_tcp_udp_validate_checksum (vlib_main_t * vm, vlib_buffer_t * p0) |
| { |
| ip4_header_t *ip0 = vlib_buffer_get_current (p0); |
| udp_header_t *udp0; |
| u16 sum16; |
| |
| ASSERT (ip0->protocol == IP_PROTOCOL_TCP |
| || ip0->protocol == IP_PROTOCOL_UDP); |
| |
| udp0 = (void *) (ip0 + 1); |
| if (ip0->protocol == IP_PROTOCOL_UDP && udp0->checksum == 0) |
| { |
| p0->flags |= (VNET_BUFFER_F_L4_CHECKSUM_COMPUTED |
| | VNET_BUFFER_F_L4_CHECKSUM_CORRECT); |
| return p0->flags; |
| } |
| |
| sum16 = ip4_tcp_udp_compute_checksum (vm, p0, ip0); |
| |
| p0->flags |= (VNET_BUFFER_F_L4_CHECKSUM_COMPUTED |
| | ((sum16 == 0) << VNET_BUFFER_F_LOG2_L4_CHECKSUM_CORRECT)); |
| |
| return p0->flags; |
| } |
| #endif |
| |
| /* *INDENT-OFF* */ |
| VNET_FEATURE_ARC_INIT (ip4_local) = |
| { |
| .arc_name = "ip4-local", |
| .start_nodes = VNET_FEATURES ("ip4-local"), |
| .last_in_arc = "ip4-local-end-of-arc", |
| }; |
| /* *INDENT-ON* */ |
| |
| static inline void |
| ip4_local_l4_csum_validate (vlib_main_t * vm, vlib_buffer_t * p, |
| ip4_header_t * ip, u8 is_udp, u8 * error, |
| u8 * good_tcp_udp) |
| { |
| u32 flags0; |
| flags0 = ip4_tcp_udp_validate_checksum (vm, p); |
| *good_tcp_udp = (flags0 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0; |
| if (is_udp) |
| { |
| udp_header_t *udp; |
| u32 ip_len, udp_len; |
| i32 len_diff; |
| udp = ip4_next_header (ip); |
| /* Verify UDP length. */ |
| ip_len = clib_net_to_host_u16 (ip->length); |
| udp_len = clib_net_to_host_u16 (udp->length); |
| |
| len_diff = ip_len - udp_len; |
| *good_tcp_udp &= len_diff >= 0; |
| *error = len_diff < 0 ? IP4_ERROR_UDP_LENGTH : *error; |
| } |
| } |
| |
| #define ip4_local_csum_is_offloaded(_b) \ |
| _b->flags & VNET_BUFFER_F_OFFLOAD_TCP_CKSUM \ |
| || _b->flags & VNET_BUFFER_F_OFFLOAD_UDP_CKSUM |
| |
| #define ip4_local_need_csum_check(is_tcp_udp, _b) \ |
| (is_tcp_udp && !(_b->flags & VNET_BUFFER_F_L4_CHECKSUM_COMPUTED \ |
| || ip4_local_csum_is_offloaded (_b))) |
| |
| #define ip4_local_csum_is_valid(_b) \ |
| (_b->flags & VNET_BUFFER_F_L4_CHECKSUM_CORRECT \ |
| || (ip4_local_csum_is_offloaded (_b))) != 0 |
| |
| static inline void |
| ip4_local_check_l4_csum (vlib_main_t * vm, vlib_buffer_t * b, |
| ip4_header_t * ih, u8 * error) |
| { |
| u8 is_udp, is_tcp_udp, good_tcp_udp; |
| |
| is_udp = ih->protocol == IP_PROTOCOL_UDP; |
| is_tcp_udp = is_udp || ih->protocol == IP_PROTOCOL_TCP; |
| |
| if (PREDICT_FALSE (ip4_local_need_csum_check (is_tcp_udp, b))) |
| ip4_local_l4_csum_validate (vm, b, ih, is_udp, error, &good_tcp_udp); |
| else |
| good_tcp_udp = ip4_local_csum_is_valid (b); |
| |
| ASSERT (IP4_ERROR_TCP_CHECKSUM + 1 == IP4_ERROR_UDP_CHECKSUM); |
| *error = (is_tcp_udp && !good_tcp_udp |
| ? IP4_ERROR_TCP_CHECKSUM + is_udp : *error); |
| } |
| |
| static inline void |
| ip4_local_check_l4_csum_x2 (vlib_main_t * vm, vlib_buffer_t ** b, |
| ip4_header_t ** ih, u8 * error) |
| { |
| u8 is_udp[2], is_tcp_udp[2], good_tcp_udp[2]; |
| |
| is_udp[0] = ih[0]->protocol == IP_PROTOCOL_UDP; |
| is_udp[1] = ih[1]->protocol == IP_PROTOCOL_UDP; |
| |
| is_tcp_udp[0] = is_udp[0] || ih[0]->protocol == IP_PROTOCOL_TCP; |
| is_tcp_udp[1] = is_udp[1] || ih[1]->protocol == IP_PROTOCOL_TCP; |
| |
| good_tcp_udp[0] = ip4_local_csum_is_valid (b[0]); |
| good_tcp_udp[1] = ip4_local_csum_is_valid (b[1]); |
| |
| if (PREDICT_FALSE (ip4_local_need_csum_check (is_tcp_udp[0], b[0]) |
| || ip4_local_need_csum_check (is_tcp_udp[1], b[1]))) |
| { |
| if (is_tcp_udp[0]) |
| ip4_local_l4_csum_validate (vm, b[0], ih[0], is_udp[0], &error[0], |
| &good_tcp_udp[0]); |
| if (is_tcp_udp[1]) |
| ip4_local_l4_csum_validate (vm, b[1], ih[1], is_udp[1], &error[1], |
| &good_tcp_udp[1]); |
| } |
| |
| error[0] = (is_tcp_udp[0] && !good_tcp_udp[0] ? |
| IP4_ERROR_TCP_CHECKSUM + is_udp[0] : error[0]); |
| error[1] = (is_tcp_udp[1] && !good_tcp_udp[1] ? |
| IP4_ERROR_TCP_CHECKSUM + is_udp[1] : error[1]); |
| } |
| |
| static inline void |
| ip4_local_set_next_and_error (vlib_node_runtime_t * error_node, |
| vlib_buffer_t * b, u16 * next, u8 error, |
| u8 head_of_feature_arc) |
| { |
| u8 arc_index = vnet_feat_arc_ip4_local.feature_arc_index; |
| u32 next_index; |
| |
| *next = error != IP4_ERROR_UNKNOWN_PROTOCOL ? IP_LOCAL_NEXT_DROP : *next; |
| b->error = error ? error_node->errors[error] : 0; |
| if (head_of_feature_arc) |
| { |
| next_index = *next; |
| if (PREDICT_TRUE (error == (u8) IP4_ERROR_UNKNOWN_PROTOCOL)) |
| { |
| vnet_feature_arc_start (arc_index, |
| vnet_buffer (b)->sw_if_index[VLIB_RX], |
| &next_index, b); |
| *next = next_index; |
| } |
| } |
| } |
| |
| typedef struct |
| { |
| ip4_address_t src; |
| u32 lbi; |
| u8 error; |
| u8 first; |
| } ip4_local_last_check_t; |
| |
| static inline void |
| ip4_local_check_src (vlib_buffer_t * b, ip4_header_t * ip0, |
| ip4_local_last_check_t * last_check, u8 * error0) |
| { |
| ip4_fib_mtrie_leaf_t leaf0; |
| ip4_fib_mtrie_t *mtrie0; |
| const dpo_id_t *dpo0; |
| load_balance_t *lb0; |
| u32 lbi0; |
| |
| vnet_buffer (b)->ip.fib_index = |
| vnet_buffer (b)->sw_if_index[VLIB_TX] != ~0 ? |
| vnet_buffer (b)->sw_if_index[VLIB_TX] : vnet_buffer (b)->ip.fib_index; |
| |
| if (PREDICT_FALSE (last_check->first || |
| (last_check->src.as_u32 != ip0->src_address.as_u32))) |
| { |
| mtrie0 = &ip4_fib_get (vnet_buffer (b)->ip.fib_index)->mtrie; |
| leaf0 = ip4_fib_mtrie_lookup_step_one (mtrie0, &ip0->src_address); |
| leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, &ip0->src_address, 2); |
| leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, &ip0->src_address, 3); |
| lbi0 = ip4_fib_mtrie_leaf_get_adj_index (leaf0); |
| |
| vnet_buffer (b)->ip.adj_index[VLIB_TX] = lbi0; |
| vnet_buffer (b)->ip.adj_index[VLIB_RX] = lbi0; |
| |
| lb0 = load_balance_get (lbi0); |
| dpo0 = load_balance_get_bucket_i (lb0, 0); |
| |
| /* |
| * Must have a route to source otherwise we drop the packet. |
| * ip4 broadcasts are accepted, e.g. to make dhcp client work |
| * |
| * The checks are: |
| * - the source is a recieve => it's from us => bogus, do this |
| * first since it sets a different error code. |
| * - uRPF check for any route to source - accept if passes. |
| * - allow packets destined to the broadcast address from unknown sources |
| */ |
| |
| *error0 = ((*error0 == IP4_ERROR_UNKNOWN_PROTOCOL |
| && dpo0->dpoi_type == DPO_RECEIVE) ? |
| IP4_ERROR_SPOOFED_LOCAL_PACKETS : *error0); |
| *error0 = ((*error0 == IP4_ERROR_UNKNOWN_PROTOCOL |
| && !fib_urpf_check_size (lb0->lb_urpf) |
| && ip0->dst_address.as_u32 != 0xFFFFFFFF) ? |
| IP4_ERROR_SRC_LOOKUP_MISS : *error0); |
| |
| last_check->src.as_u32 = ip0->src_address.as_u32; |
| last_check->lbi = lbi0; |
| last_check->error = *error0; |
| } |
| else |
| { |
| vnet_buffer (b)->ip.adj_index[VLIB_TX] = last_check->lbi; |
| vnet_buffer (b)->ip.adj_index[VLIB_RX] = last_check->lbi; |
| *error0 = last_check->error; |
| last_check->first = 0; |
| } |
| } |
| |
| static inline void |
| ip4_local_check_src_x2 (vlib_buffer_t ** b, ip4_header_t ** ip, |
| ip4_local_last_check_t * last_check, u8 * error) |
| { |
| ip4_fib_mtrie_leaf_t leaf[2]; |
| ip4_fib_mtrie_t *mtrie[2]; |
| const dpo_id_t *dpo[2]; |
| load_balance_t *lb[2]; |
| u32 not_last_hit; |
| u32 lbi[2]; |
| |
| not_last_hit = last_check->first; |
| not_last_hit |= ip[0]->src_address.as_u32 ^ last_check->src.as_u32; |
| not_last_hit |= ip[1]->src_address.as_u32 ^ last_check->src.as_u32; |
| |
| vnet_buffer (b[0])->ip.fib_index = |
| vnet_buffer (b[0])->sw_if_index[VLIB_TX] != ~0 ? |
| vnet_buffer (b[0])->sw_if_index[VLIB_TX] : |
| vnet_buffer (b[0])->ip.fib_index; |
| |
| vnet_buffer (b[1])->ip.fib_index = |
| vnet_buffer (b[1])->sw_if_index[VLIB_TX] != ~0 ? |
| vnet_buffer (b[1])->sw_if_index[VLIB_TX] : |
| vnet_buffer (b[1])->ip.fib_index; |
| |
| if (PREDICT_FALSE (not_last_hit)) |
| { |
| mtrie[0] = &ip4_fib_get (vnet_buffer (b[0])->ip.fib_index)->mtrie; |
| mtrie[1] = &ip4_fib_get (vnet_buffer (b[1])->ip.fib_index)->mtrie; |
| |
| leaf[0] = ip4_fib_mtrie_lookup_step_one (mtrie[0], &ip[0]->src_address); |
| leaf[1] = ip4_fib_mtrie_lookup_step_one (mtrie[1], &ip[1]->src_address); |
| |
| leaf[0] = ip4_fib_mtrie_lookup_step (mtrie[0], leaf[0], |
| &ip[0]->src_address, 2); |
| leaf[1] = ip4_fib_mtrie_lookup_step (mtrie[1], leaf[1], |
| &ip[1]->src_address, 2); |
| |
| leaf[0] = ip4_fib_mtrie_lookup_step (mtrie[0], leaf[0], |
| &ip[0]->src_address, 3); |
| leaf[1] = ip4_fib_mtrie_lookup_step (mtrie[1], leaf[1], |
| &ip[1]->src_address, 3); |
| |
| lbi[0] = ip4_fib_mtrie_leaf_get_adj_index (leaf[0]); |
| lbi[1] = ip4_fib_mtrie_leaf_get_adj_index (leaf[1]); |
| |
| vnet_buffer (b[0])->ip.adj_index[VLIB_TX] = lbi[0]; |
| vnet_buffer (b[0])->ip.adj_index[VLIB_RX] = lbi[0]; |
| |
| vnet_buffer (b[1])->ip.adj_index[VLIB_TX] = lbi[1]; |
| vnet_buffer (b[1])->ip.adj_index[VLIB_RX] = lbi[1]; |
| |
| lb[0] = load_balance_get (lbi[0]); |
| lb[1] = load_balance_get (lbi[1]); |
| |
| dpo[0] = load_balance_get_bucket_i (lb[0], 0); |
| dpo[1] = load_balance_get_bucket_i (lb[1], 0); |
| |
| error[0] = ((error[0] == IP4_ERROR_UNKNOWN_PROTOCOL && |
| dpo[0]->dpoi_type == DPO_RECEIVE) ? |
| IP4_ERROR_SPOOFED_LOCAL_PACKETS : error[0]); |
| error[0] = ((error[0] == IP4_ERROR_UNKNOWN_PROTOCOL && |
| !fib_urpf_check_size (lb[0]->lb_urpf) && |
| ip[0]->dst_address.as_u32 != 0xFFFFFFFF) |
| ? IP4_ERROR_SRC_LOOKUP_MISS : error[0]); |
| |
| error[1] = ((error[1] == IP4_ERROR_UNKNOWN_PROTOCOL && |
| dpo[1]->dpoi_type == DPO_RECEIVE) ? |
| IP4_ERROR_SPOOFED_LOCAL_PACKETS : error[1]); |
| error[1] = ((error[1] == IP4_ERROR_UNKNOWN_PROTOCOL && |
| !fib_urpf_check_size (lb[1]->lb_urpf) && |
| ip[1]->dst_address.as_u32 != 0xFFFFFFFF) |
| ? IP4_ERROR_SRC_LOOKUP_MISS : error[1]); |
| |
| last_check->src.as_u32 = ip[1]->src_address.as_u32; |
| last_check->lbi = lbi[1]; |
| last_check->error = error[1]; |
| } |
| else |
| { |
| vnet_buffer (b[0])->ip.adj_index[VLIB_TX] = last_check->lbi; |
| vnet_buffer (b[0])->ip.adj_index[VLIB_RX] = last_check->lbi; |
| |
| vnet_buffer (b[1])->ip.adj_index[VLIB_TX] = last_check->lbi; |
| vnet_buffer (b[1])->ip.adj_index[VLIB_RX] = last_check->lbi; |
| |
| error[0] = last_check->error; |
| error[1] = last_check->error; |
| last_check->first = 0; |
| } |
| } |
| |
| enum ip_local_packet_type_e |
| { |
| IP_LOCAL_PACKET_TYPE_L4, |
| IP_LOCAL_PACKET_TYPE_NAT, |
| IP_LOCAL_PACKET_TYPE_FRAG, |
| }; |
| |
| /** |
| * Determine packet type and next node. |
| * |
| * The expectation is that all packets that are not L4 will skip |
| * checksums and source checks. |
| */ |
| always_inline u8 |
| ip4_local_classify (vlib_buffer_t * b, ip4_header_t * ip, u16 * next) |
| { |
| ip_lookup_main_t *lm = &ip4_main.lookup_main; |
| |
| if (PREDICT_FALSE (ip4_is_fragment (ip))) |
| { |
| *next = IP_LOCAL_NEXT_REASSEMBLY; |
| return IP_LOCAL_PACKET_TYPE_FRAG; |
| } |
| if (PREDICT_FALSE (b->flags & VNET_BUFFER_F_IS_NATED)) |
| { |
| *next = lm->local_next_by_ip_protocol[ip->protocol]; |
| return IP_LOCAL_PACKET_TYPE_NAT; |
| } |
| |
| *next = lm->local_next_by_ip_protocol[ip->protocol]; |
| return IP_LOCAL_PACKET_TYPE_L4; |
| } |
| |
| static inline uword |
| ip4_local_inline (vlib_main_t * vm, |
| vlib_node_runtime_t * node, |
| vlib_frame_t * frame, int head_of_feature_arc) |
| { |
| u32 *from, n_left_from; |
| vlib_node_runtime_t *error_node = |
| vlib_node_get_runtime (vm, ip4_input_node.index); |
| u16 nexts[VLIB_FRAME_SIZE], *next; |
| vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b; |
| ip4_header_t *ip[2]; |
| u8 error[2], pt[2]; |
| |
| ip4_local_last_check_t last_check = { |
| /* |
| * 0.0.0.0 can appear as the source address of an IP packet, |
| * as can any other address, hence the need to use the 'first' |
| * member to make sure the .lbi is initialised for the first |
| * packet. |
| */ |
| .src = {.as_u32 = 0}, |
| .lbi = ~0, |
| .error = IP4_ERROR_UNKNOWN_PROTOCOL, |
| .first = 1, |
| }; |
| |
| from = vlib_frame_vector_args (frame); |
| n_left_from = frame->n_vectors; |
| |
| if (node->flags & VLIB_NODE_FLAG_TRACE) |
| ip4_forward_next_trace (vm, node, frame, VLIB_TX); |
| |
| vlib_get_buffers (vm, from, bufs, n_left_from); |
| b = bufs; |
| next = nexts; |
| |
| while (n_left_from >= 6) |
| { |
| u8 not_batch = 0; |
| |
| /* Prefetch next iteration. */ |
| { |
| vlib_prefetch_buffer_header (b[4], LOAD); |
| vlib_prefetch_buffer_header (b[5], LOAD); |
| |
| CLIB_PREFETCH (b[4]->data, CLIB_CACHE_LINE_BYTES, LOAD); |
| CLIB_PREFETCH (b[5]->data, CLIB_CACHE_LINE_BYTES, LOAD); |
| } |
| |
| error[0] = error[1] = IP4_ERROR_UNKNOWN_PROTOCOL; |
| |
| ip[0] = vlib_buffer_get_current (b[0]); |
| ip[1] = vlib_buffer_get_current (b[1]); |
| |
| vnet_buffer (b[0])->l3_hdr_offset = b[0]->current_data; |
| vnet_buffer (b[1])->l3_hdr_offset = b[1]->current_data; |
| |
| pt[0] = ip4_local_classify (b[0], ip[0], &next[0]); |
| pt[1] = ip4_local_classify (b[1], ip[1], &next[1]); |
| |
| not_batch = pt[0] ^ pt[1]; |
| |
| if (head_of_feature_arc == 0 || (pt[0] && not_batch == 0)) |
| goto skip_checks; |
| |
| if (PREDICT_TRUE (not_batch == 0)) |
| { |
| ip4_local_check_l4_csum_x2 (vm, b, ip, error); |
| ip4_local_check_src_x2 (b, ip, &last_check, error); |
| } |
| else |
| { |
| if (!pt[0]) |
| { |
| ip4_local_check_l4_csum (vm, b[0], ip[0], &error[0]); |
| ip4_local_check_src (b[0], ip[0], &last_check, &error[0]); |
| } |
| if (!pt[1]) |
| { |
| ip4_local_check_l4_csum (vm, b[1], ip[1], &error[1]); |
| ip4_local_check_src (b[1], ip[1], &last_check, &error[1]); |
| } |
| } |
| |
| skip_checks: |
| |
| ip4_local_set_next_and_error (error_node, b[0], &next[0], error[0], |
| head_of_feature_arc); |
| ip4_local_set_next_and_error (error_node, b[1], &next[1], error[1], |
| head_of_feature_arc); |
| |
| b += 2; |
| next += 2; |
| n_left_from -= 2; |
| } |
| |
| while (n_left_from > 0) |
| { |
| error[0] = IP4_ERROR_UNKNOWN_PROTOCOL; |
| |
| ip[0] = vlib_buffer_get_current (b[0]); |
| vnet_buffer (b[0])->l3_hdr_offset = b[0]->current_data; |
| pt[0] = ip4_local_classify (b[0], ip[0], &next[0]); |
| |
| if (head_of_feature_arc == 0 || pt[0]) |
| goto skip_check; |
| |
| ip4_local_check_l4_csum (vm, b[0], ip[0], &error[0]); |
| ip4_local_check_src (b[0], ip[0], &last_check, &error[0]); |
| |
| skip_check: |
| |
| ip4_local_set_next_and_error (error_node, b[0], &next[0], error[0], |
| head_of_feature_arc); |
| |
| b += 1; |
| next += 1; |
| n_left_from -= 1; |
| } |
| |
| vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors); |
| return frame->n_vectors; |
| } |
| |
| VLIB_NODE_FN (ip4_local_node) (vlib_main_t * vm, vlib_node_runtime_t * node, |
| vlib_frame_t * frame) |
| { |
| return ip4_local_inline (vm, node, frame, 1 /* head of feature arc */ ); |
| } |
| |
| /* *INDENT-OFF* */ |
| VLIB_REGISTER_NODE (ip4_local_node) = |
| { |
| .name = "ip4-local", |
| .vector_size = sizeof (u32), |
| .format_trace = format_ip4_forward_next_trace, |
| .n_next_nodes = IP_LOCAL_N_NEXT, |
| .next_nodes = |
| { |
| [IP_LOCAL_NEXT_DROP] = "ip4-drop", |
| [IP_LOCAL_NEXT_PUNT] = "ip4-punt", |
| [IP_LOCAL_NEXT_UDP_LOOKUP] = "ip4-udp-lookup", |
| [IP_LOCAL_NEXT_ICMP] = "ip4-icmp-input", |
| [IP_LOCAL_NEXT_REASSEMBLY] = "ip4-reassembly", |
| }, |
| }; |
| /* *INDENT-ON* */ |
| |
| |
| VLIB_NODE_FN (ip4_local_end_of_arc_node) (vlib_main_t * vm, |
| vlib_node_runtime_t * node, |
| vlib_frame_t * frame) |
| { |
| return ip4_local_inline (vm, node, frame, 0 /* head of feature arc */ ); |
| } |
| |
| /* *INDENT-OFF* */ |
| VLIB_REGISTER_NODE (ip4_local_end_of_arc_node) = { |
| .name = "ip4-local-end-of-arc", |
| .vector_size = sizeof (u32), |
| |
| .format_trace = format_ip4_forward_next_trace, |
| .sibling_of = "ip4-local", |
| }; |
| |
| VNET_FEATURE_INIT (ip4_local_end_of_arc, static) = { |
| .arc_name = "ip4-local", |
| .node_name = "ip4-local-end-of-arc", |
| .runs_before = 0, /* not before any other features */ |
| }; |
| /* *INDENT-ON* */ |
| |
| #ifndef CLIB_MARCH_VARIANT |
| void |
| ip4_register_protocol (u32 protocol, u32 node_index) |
| { |
| vlib_main_t *vm = vlib_get_main (); |
| ip4_main_t *im = &ip4_main; |
| ip_lookup_main_t *lm = &im->lookup_main; |
| |
| ASSERT (protocol < ARRAY_LEN (lm->local_next_by_ip_protocol)); |
| lm->local_next_by_ip_protocol[protocol] = |
| vlib_node_add_next (vm, ip4_local_node.index, node_index); |
| } |
| #endif |
| |
| static clib_error_t * |
| show_ip_local_command_fn (vlib_main_t * vm, |
| unformat_input_t * input, vlib_cli_command_t * cmd) |
| { |
| ip4_main_t *im = &ip4_main; |
| ip_lookup_main_t *lm = &im->lookup_main; |
| int i; |
| |
| vlib_cli_output (vm, "Protocols handled by ip4_local"); |
| for (i = 0; i < ARRAY_LEN (lm->local_next_by_ip_protocol); i++) |
| { |
| if (lm->local_next_by_ip_protocol[i] != IP_LOCAL_NEXT_PUNT) |
| { |
| u32 node_index = vlib_get_node (vm, |
| ip4_local_node.index)-> |
| next_nodes[lm->local_next_by_ip_protocol[i]]; |
| vlib_cli_output (vm, "%d: %U", i, format_vlib_node_name, vm, |
| node_index); |
| } |
| } |
| return 0; |
| } |
| |
| |
| |
| /*? |
| * Display the set of protocols handled by the local IPv4 stack. |
| * |
| * @cliexpar |
| * Example of how to display local protocol table: |
| * @cliexstart{show ip local} |
| * Protocols handled by ip4_local |
| * 1 |
| * 17 |
| * 47 |
| * @cliexend |
| ?*/ |
| /* *INDENT-OFF* */ |
| VLIB_CLI_COMMAND (show_ip_local, static) = |
| { |
| .path = "show ip local", |
| .function = show_ip_local_command_fn, |
| .short_help = "show ip local", |
| }; |
| /* *INDENT-ON* */ |
| |
| always_inline uword |
| ip4_arp_inline (vlib_main_t * vm, |
| vlib_node_runtime_t * node, |
| vlib_frame_t * frame, int is_glean) |
| { |
| vnet_main_t *vnm = vnet_get_main (); |
| ip4_main_t *im = &ip4_main; |
| ip_lookup_main_t *lm = &im->lookup_main; |
| u32 *from, *to_next_drop; |
| uword n_left_from, n_left_to_next_drop, next_index; |
| u32 thread_index = vm->thread_index; |
| u64 seed; |
| |
| if (node->flags & VLIB_NODE_FLAG_TRACE) |
| ip4_forward_next_trace (vm, node, frame, VLIB_TX); |
| |
| seed = throttle_seed (&im->arp_throttle, thread_index, vlib_time_now (vm)); |
| |
| from = vlib_frame_vector_args (frame); |
| n_left_from = frame->n_vectors; |
| next_index = node->cached_next_index; |
| if (next_index == IP4_ARP_NEXT_DROP) |
| next_index = IP4_ARP_N_NEXT; /* point to first interface */ |
| |
| while (n_left_from > 0) |
| { |
| vlib_get_next_frame (vm, node, IP4_ARP_NEXT_DROP, |
| to_next_drop, n_left_to_next_drop); |
| |
| while (n_left_from > 0 && n_left_to_next_drop > 0) |
| { |
| u32 pi0, bi0, adj_index0, sw_if_index0; |
| ip_adjacency_t *adj0; |
| vlib_buffer_t *p0, *b0; |
| ip4_address_t resolve0; |
| ethernet_arp_header_t *h0; |
| vnet_hw_interface_t *hw_if0; |
| u64 r0; |
| |
| pi0 = from[0]; |
| p0 = vlib_get_buffer (vm, pi0); |
| |
| from += 1; |
| n_left_from -= 1; |
| to_next_drop[0] = pi0; |
| to_next_drop += 1; |
| n_left_to_next_drop -= 1; |
| |
| adj_index0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX]; |
| adj0 = adj_get (adj_index0); |
| |
| if (is_glean) |
| { |
| /* resolve the packet's destination */ |
| ip4_header_t *ip0 = vlib_buffer_get_current (p0); |
| resolve0 = ip0->dst_address; |
| } |
| else |
| { |
| /* resolve the incomplete adj */ |
| resolve0 = adj0->sub_type.nbr.next_hop.ip4; |
| } |
| |
| /* combine the address and interface for the hash key */ |
| sw_if_index0 = adj0->rewrite_header.sw_if_index; |
| r0 = (u64) resolve0.data_u32 << 32; |
| r0 |= sw_if_index0; |
| |
| if (throttle_check (&im->arp_throttle, thread_index, r0, seed)) |
| { |
| p0->error = node->errors[IP4_ARP_ERROR_THROTTLED]; |
| continue; |
| } |
| |
| /* |
| * the adj has been updated to a rewrite but the node the DPO that got |
| * us here hasn't - yet. no big deal. we'll drop while we wait. |
| */ |
| if (IP_LOOKUP_NEXT_REWRITE == adj0->lookup_next_index) |
| { |
| p0->error = node->errors[IP4_ARP_ERROR_RESOLVED]; |
| continue; |
| } |
| |
| /* |
| * Can happen if the control-plane is programming tables |
| * with traffic flowing; at least that's today's lame excuse. |
| */ |
| if ((is_glean && adj0->lookup_next_index != IP_LOOKUP_NEXT_GLEAN) |
| || (!is_glean && adj0->lookup_next_index != IP_LOOKUP_NEXT_ARP)) |
| { |
| p0->error = node->errors[IP4_ARP_ERROR_NON_ARP_ADJ]; |
| continue; |
| } |
| /* Send ARP request. */ |
| h0 = |
| vlib_packet_template_get_packet (vm, |
| &im->ip4_arp_request_packet_template, |
| &bi0); |
| b0 = vlib_get_buffer (vm, bi0); |
| |
| /* copy the persistent fields from the original */ |
| clib_memcpy_fast (b0->opaque2, p0->opaque2, sizeof (p0->opaque2)); |
| |
| /* Seems we're out of buffers */ |
| if (PREDICT_FALSE (!h0)) |
| { |
| p0->error = node->errors[IP4_ARP_ERROR_NO_BUFFERS]; |
| continue; |
| } |
| |
| /* Add rewrite/encap string for ARP packet. */ |
| vnet_rewrite_one_header (adj0[0], h0, sizeof (ethernet_header_t)); |
| |
| hw_if0 = vnet_get_sup_hw_interface (vnm, sw_if_index0); |
| |
| /* Src ethernet address in ARP header. */ |
| mac_address_from_bytes (&h0->ip4_over_ethernet[0].mac, |
| hw_if0->hw_address); |
| if (is_glean) |
| { |
| /* The interface's source address is stashed in the Glean Adj */ |
| h0->ip4_over_ethernet[0].ip4 = |
| adj0->sub_type.glean.receive_addr.ip4; |
| } |
| else |
| { |
| /* Src IP address in ARP header. */ |
| if (ip4_src_address_for_packet (lm, sw_if_index0, |
| &h0->ip4_over_ethernet[0].ip4)) |
| { |
| /* No source address available */ |
| p0->error = node->errors[IP4_ARP_ERROR_NO_SOURCE_ADDRESS]; |
| vlib_buffer_free (vm, &bi0, 1); |
| continue; |
| } |
| } |
| h0->ip4_over_ethernet[1].ip4 = resolve0; |
| |
| p0->error = node->errors[IP4_ARP_ERROR_REQUEST_SENT]; |
| |
| vlib_buffer_copy_trace_flag (vm, p0, bi0); |
| VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b0); |
| vnet_buffer (b0)->sw_if_index[VLIB_TX] = sw_if_index0; |
| |
| vlib_buffer_advance (b0, -adj0->rewrite_header.data_bytes); |
| |
| vlib_set_next_frame_buffer (vm, node, |
| adj0->rewrite_header.next_index, bi0); |
| } |
| |
| vlib_put_next_frame (vm, node, IP4_ARP_NEXT_DROP, n_left_to_next_drop); |
| } |
| |
| return frame->n_vectors; |
| } |
| |
| VLIB_NODE_FN (ip4_arp_node) (vlib_main_t * vm, vlib_node_runtime_t * node, |
| vlib_frame_t * frame) |
| { |
| return (ip4_arp_inline (vm, node, frame, 0)); |
| } |
| |
| VLIB_NODE_FN (ip4_glean_node) (vlib_main_t * vm, vlib_node_runtime_t * node, |
| vlib_frame_t * frame) |
| { |
| return (ip4_arp_inline (vm, node, frame, 1)); |
| } |
| |
| static char *ip4_arp_error_strings[] = { |
| [IP4_ARP_ERROR_THROTTLED] = "ARP requests throttled", |
| [IP4_ARP_ERROR_RESOLVED] = "ARP requests resolved", |
| [IP4_ARP_ERROR_NO_BUFFERS] = "ARP requests out of buffer", |
| [IP4_ARP_ERROR_REQUEST_SENT] = "ARP requests sent", |
| [IP4_ARP_ERROR_NON_ARP_ADJ] = "ARPs to non-ARP adjacencies", |
| [IP4_ARP_ERROR_NO_SOURCE_ADDRESS] = "no source address for ARP request", |
| }; |
| |
| /* *INDENT-OFF* */ |
| VLIB_REGISTER_NODE (ip4_arp_node) = |
| { |
| .name = "ip4-arp", |
| .vector_size = sizeof (u32), |
| .format_trace = format_ip4_forward_next_trace, |
| .n_errors = ARRAY_LEN (ip4_arp_error_strings), |
| .error_strings = ip4_arp_error_strings, |
| .n_next_nodes = IP4_ARP_N_NEXT, |
| .next_nodes = |
| { |
| [IP4_ARP_NEXT_DROP] = "error-drop", |
| }, |
| }; |
| |
| VLIB_REGISTER_NODE (ip4_glean_node) = |
| { |
| .name = "ip4-glean", |
| .vector_size = sizeof (u32), |
| .format_trace = format_ip4_forward_next_trace, |
| .n_errors = ARRAY_LEN (ip4_arp_error_strings), |
| .error_strings = ip4_arp_error_strings, |
| .n_next_nodes = IP4_ARP_N_NEXT, |
| .next_nodes = { |
| [IP4_ARP_NEXT_DROP] = "error-drop", |
| }, |
| }; |
| /* *INDENT-ON* */ |
| |
| #define foreach_notrace_ip4_arp_error \ |
| _(THROTTLED) \ |
| _(RESOLVED) \ |
| _(NO_BUFFERS) \ |
| _(REQUEST_SENT) \ |
| _(NON_ARP_ADJ) \ |
| _(NO_SOURCE_ADDRESS) |
| |
| static clib_error_t * |
| arp_notrace_init (vlib_main_t * vm) |
| { |
| vlib_node_runtime_t *rt = vlib_node_get_runtime (vm, ip4_arp_node.index); |
| |
| /* don't trace ARP request packets */ |
| #define _(a) \ |
| vnet_pcap_drop_trace_filter_add_del \ |
| (rt->errors[IP4_ARP_ERROR_##a], \ |
| 1 /* is_add */); |
| foreach_notrace_ip4_arp_error; |
| #undef _ |
| return 0; |
| } |
| |
| VLIB_INIT_FUNCTION (arp_notrace_init); |
| |
| |
| #ifndef CLIB_MARCH_VARIANT |
| /* Send an ARP request to see if given destination is reachable on given interface. */ |
| clib_error_t * |
| ip4_probe_neighbor (vlib_main_t * vm, ip4_address_t * dst, u32 sw_if_index, |
| u8 refresh) |
| { |
| vnet_main_t *vnm = vnet_get_main (); |
| ip4_main_t *im = &ip4_main; |
| ethernet_arp_header_t *h; |
| ip4_address_t *src; |
| ip_interface_address_t *ia; |
| ip_adjacency_t *adj; |
| vnet_hw_interface_t *hi; |
| vnet_sw_interface_t *si; |
| vlib_buffer_t *b; |
| adj_index_t ai; |
| u32 bi = 0; |
| u8 unicast_rewrite = 0; |
| |
| si = vnet_get_sw_interface (vnm, sw_if_index); |
| |
| if (!(si->flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP)) |
| { |
| return clib_error_return (0, "%U: interface %U down", |
| format_ip4_address, dst, |
| format_vnet_sw_if_index_name, vnm, |
| sw_if_index); |
| } |
| |
| src = |
| ip4_interface_address_matching_destination (im, dst, sw_if_index, &ia); |
| if (!src) |
| { |
| vnm->api_errno = VNET_API_ERROR_NO_MATCHING_INTERFACE; |
| return clib_error_return |
| (0, |
| "no matching interface address for destination %U (interface %U)", |
| format_ip4_address, dst, format_vnet_sw_if_index_name, vnm, |
| sw_if_index); |
| } |
| |
| h = vlib_packet_template_get_packet (vm, |
| &im->ip4_arp_request_packet_template, |
| &bi); |
| |
| if (!h) |
| return clib_error_return (0, "ARP request packet allocation failed"); |
| |
| hi = vnet_get_sup_hw_interface (vnm, sw_if_index); |
| if (PREDICT_FALSE (!hi->hw_address)) |
| { |
| return clib_error_return (0, "%U: interface %U do not support ip probe", |
| format_ip4_address, dst, |
| format_vnet_sw_if_index_name, vnm, |
| sw_if_index); |
| } |
| |
| mac_address_from_bytes (&h->ip4_over_ethernet[0].mac, hi->hw_address); |
| |
| h->ip4_over_ethernet[0].ip4 = src[0]; |
| h->ip4_over_ethernet[1].ip4 = dst[0]; |
| |
| b = vlib_get_buffer (vm, bi); |
| vnet_buffer (b)->sw_if_index[VLIB_RX] = |
| vnet_buffer (b)->sw_if_index[VLIB_TX] = sw_if_index; |
| |
| ip46_address_t nh = { |
| .ip4 = *dst, |
| }; |
| |
| ai = adj_nbr_add_or_lock (FIB_PROTOCOL_IP4, |
| VNET_LINK_IP4, &nh, sw_if_index); |
| adj = adj_get (ai); |
| |
| /* Peer has been previously resolved, retrieve glean adj instead */ |
| if (adj->lookup_next_index == IP_LOOKUP_NEXT_REWRITE) |
| { |
| if (refresh) |
| unicast_rewrite = 1; |
| else |
| { |
| adj_unlock (ai); |
| ai = adj_glean_add_or_lock (FIB_PROTOCOL_IP4, |
| VNET_LINK_IP4, sw_if_index, &nh); |
| adj = adj_get (ai); |
| } |
| } |
| |
| /* Add encapsulation string for software interface (e.g. ethernet header). */ |
| vnet_rewrite_one_header (adj[0], h, sizeof (ethernet_header_t)); |
| if (unicast_rewrite) |
| { |
| u16 *etype = vlib_buffer_get_current (b) - 2; |
| etype[0] = clib_host_to_net_u16 (ETHERNET_TYPE_ARP); |
| } |
| vlib_buffer_advance (b, -adj->rewrite_header.data_bytes); |
| |
| { |
| vlib_frame_t *f = vlib_get_frame_to_node (vm, hi->output_node_index); |
| u32 *to_next = vlib_frame_vector_args (f); |
| to_next[0] = bi; |
| f->n_vectors = 1; |
| vlib_put_frame_to_node (vm, hi->output_node_index, f); |
| } |
| |
| adj_unlock (ai); |
| return /* no error */ 0; |
| } |
| #endif |
| |
| typedef enum |
| { |
| IP4_REWRITE_NEXT_DROP, |
| IP4_REWRITE_NEXT_ICMP_ERROR, |
| IP4_REWRITE_NEXT_FRAGMENT, |
| IP4_REWRITE_N_NEXT /* Last */ |
| } ip4_rewrite_next_t; |
| |
| /** |
| * This bits of an IPv4 address to mask to construct a multicast |
| * MAC address |
| */ |
| #if CLIB_ARCH_IS_BIG_ENDIAN |
| #define IP4_MCAST_ADDR_MASK 0x007fffff |
| #else |
| #define IP4_MCAST_ADDR_MASK 0xffff7f00 |
| #endif |
| |
| always_inline void |
| ip4_mtu_check (vlib_buffer_t * b, u16 packet_len, |
| u16 adj_packet_bytes, bool df, u16 * next, u32 * error) |
| { |
| if (packet_len > adj_packet_bytes) |
| { |
| *error = IP4_ERROR_MTU_EXCEEDED; |
| if (df) |
| { |
| icmp4_error_set_vnet_buffer |
| (b, ICMP4_destination_unreachable, |
| ICMP4_destination_unreachable_fragmentation_needed_and_dont_fragment_set, |
| adj_packet_bytes); |
| *next = IP4_REWRITE_NEXT_ICMP_ERROR; |
| } |
| else |
| { |
| /* IP fragmentation */ |
| ip_frag_set_vnet_buffer (b, adj_packet_bytes, |
| IP4_FRAG_NEXT_IP4_REWRITE, 0); |
| *next = IP4_REWRITE_NEXT_FRAGMENT; |
| } |
| } |
| } |
| |
| /* Decrement TTL & update checksum. |
| Works either endian, so no need for byte swap. */ |
| static_always_inline void |
| ip4_ttl_and_checksum_check (vlib_buffer_t * b, ip4_header_t * ip, u16 * next, |
| u32 * error) |
| { |
| i32 ttl; |
| u32 checksum; |
| if (PREDICT_FALSE (b->flags & VNET_BUFFER_F_LOCALLY_ORIGINATED)) |
| { |
| b->flags &= ~VNET_BUFFER_F_LOCALLY_ORIGINATED; |
| return; |
| } |
| |
| ttl = ip->ttl; |
| |
| /* Input node should have reject packets with ttl 0. */ |
| ASSERT (ip->ttl > 0); |
| |
| checksum = ip->checksum + clib_host_to_net_u16 (0x0100); |
| checksum += checksum >= 0xffff; |
| |
| ip->checksum = checksum; |
| ttl -= 1; |
| ip->ttl = ttl; |
| |
| /* |
| * If the ttl drops below 1 when forwarding, generate |
| * an ICMP response. |
| */ |
| if (PREDICT_FALSE (ttl <= 0)) |
| { |
| *error = IP4_ERROR_TIME_EXPIRED; |
| vnet_buffer (b)->sw_if_index[VLIB_TX] = (u32) ~ 0; |
| icmp4_error_set_vnet_buffer (b, ICMP4_time_exceeded, |
| ICMP4_time_exceeded_ttl_exceeded_in_transit, |
| 0); |
| *next = IP4_REWRITE_NEXT_ICMP_ERROR; |
| } |
| |
| /* Verify checksum. */ |
| ASSERT ((ip->checksum == ip4_header_checksum (ip)) || |
| (b->flags & VNET_BUFFER_F_OFFLOAD_IP_CKSUM)); |
| } |
| |
| |
| always_inline uword |
| ip4_rewrite_inline (vlib_main_t * vm, |
| vlib_node_runtime_t * node, |
| vlib_frame_t * frame, |
| int do_counters, int is_midchain, int is_mcast) |
| { |
| ip_lookup_main_t *lm = &ip4_main.lookup_main; |
| u32 *from = vlib_frame_vector_args (frame); |
| vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b; |
| u16 nexts[VLIB_FRAME_SIZE], *next; |
| u32 n_left_from; |
| vlib_node_runtime_t *error_node = |
| vlib_node_get_runtime (vm, ip4_input_node.index); |
| |
| n_left_from = frame->n_vectors; |
| u32 thread_index = vm->thread_index; |
| |
| vlib_get_buffers (vm, from, bufs, n_left_from); |
| clib_memset_u16 (nexts, IP4_REWRITE_NEXT_DROP, n_left_from); |
| |
| if (n_left_from >= 6) |
| { |
| int i; |
| for (i = 2; i < 6; i++) |
| vlib_prefetch_buffer_header (bufs[i], LOAD); |
| } |
| |
| next = nexts; |
| b = bufs; |
| while (n_left_from >= 8) |
| { |
| ip_adjacency_t *adj0, *adj1; |
| ip4_header_t *ip0, *ip1; |
| u32 rw_len0, error0, adj_index0; |
| u32 rw_len1, error1, adj_index1; |
| u32 tx_sw_if_index0, tx_sw_if_index1; |
| u8 *p; |
| |
| vlib_prefetch_buffer_header (b[6], LOAD); |
| vlib_prefetch_buffer_header (b[7], LOAD); |
| |
| adj_index0 = vnet_buffer (b[0])->ip.adj_index[VLIB_TX]; |
| adj_index1 = vnet_buffer (b[1])->ip.adj_index[VLIB_TX]; |
| |
| /* |
| * pre-fetch the per-adjacency counters |
| */ |
| if (do_counters) |
| { |
| vlib_prefetch_combined_counter (&adjacency_counters, |
| thread_index, adj_index0); |
| vlib_prefetch_combined_counter (&adjacency_counters, |
| thread_index, adj_index1); |
| } |
| |
| ip0 = vlib_buffer_get_current (b[0]); |
| ip1 = vlib_buffer_get_current (b[1]); |
| |
| error0 = error1 = IP4_ERROR_NONE; |
| |
| ip4_ttl_and_checksum_check (b[0], ip0, next + 0, &error0); |
| ip4_ttl_and_checksum_check (b[1], ip1, next + 1, &error1); |
| |
| /* Rewrite packet header and updates lengths. */ |
| adj0 = adj_get (adj_index0); |
| adj1 = adj_get (adj_index1); |
| |
| /* Worth pipelining. No guarantee that adj0,1 are hot... */ |
| rw_len0 = adj0[0].rewrite_header.data_bytes; |
| rw_len1 = adj1[0].rewrite_header.data_bytes; |
| vnet_buffer (b[0])->ip.save_rewrite_length = rw_len0; |
| vnet_buffer (b[1])->ip.save_rewrite_length = rw_len1; |
| |
| p = vlib_buffer_get_current (b[2]); |
| CLIB_PREFETCH (p - CLIB_CACHE_LINE_BYTES, CLIB_CACHE_LINE_BYTES, STORE); |
| CLIB_PREFETCH (p, CLIB_CACHE_LINE_BYTES, LOAD); |
| |
| p = vlib_buffer_get_current (b[3]); |
| CLIB_PREFETCH (p - CLIB_CACHE_LINE_BYTES, CLIB_CACHE_LINE_BYTES, STORE); |
| CLIB_PREFETCH (p, CLIB_CACHE_LINE_BYTES, LOAD); |
| |
| /* Check MTU of outgoing interface. */ |
| ip4_mtu_check (b[0], clib_net_to_host_u16 (ip0->length), |
| adj0[0].rewrite_header.max_l3_packet_bytes, |
| ip0->flags_and_fragment_offset & |
| clib_host_to_net_u16 (IP4_HEADER_FLAG_DONT_FRAGMENT), |
| next + 0, &error0); |
| ip4_mtu_check (b[1], clib_net_to_host_u16 (ip1->length), |
| adj1[0].rewrite_header.max_l3_packet_bytes, |
| ip1->flags_and_fragment_offset & |
| clib_host_to_net_u16 (IP4_HEADER_FLAG_DONT_FRAGMENT), |
| next + 1, &error1); |
| |
| if (is_mcast) |
| { |
| error0 = ((adj0[0].rewrite_header.sw_if_index == |
| vnet_buffer (b[0])->sw_if_index[VLIB_RX]) ? |
| IP4_ERROR_SAME_INTERFACE : error0); |
| error1 = ((adj1[0].rewrite_header.sw_if_index == |
| vnet_buffer (b[1])->sw_if_index[VLIB_RX]) ? |
| IP4_ERROR_SAME_INTERFACE : error1); |
| } |
| |
| b[0]->error = error_node->errors[error0]; |
| b[1]->error = error_node->errors[error1]; |
| /* Don't adjust the buffer for ttl issue; icmp-error node wants |
| * to see the IP headerr */ |
| if (PREDICT_TRUE (error0 == IP4_ERROR_NONE)) |
| { |
| u32 next_index = adj0[0].rewrite_header.next_index; |
| b[0]->current_data -= rw_len0; |
| b[0]->current_length += rw_len0; |
| tx_sw_if_index0 = adj0[0].rewrite_header.sw_if_index; |
| vnet_buffer (b[0])->sw_if_index[VLIB_TX] = tx_sw_if_index0; |
| |
| if (PREDICT_FALSE |
| (adj0[0].rewrite_header.flags & VNET_REWRITE_HAS_FEATURES)) |
| vnet_feature_arc_start (lm->output_feature_arc_index, |
| tx_sw_if_index0, &next_index, b[0]); |
| next[0] = next_index; |
| } |
| if (PREDICT_TRUE (error1 == IP4_ERROR_NONE)) |
| { |
| u32 next_index = adj1[0].rewrite_header.next_index; |
| b[1]->current_data -= rw_len1; |
| b[1]->current_length += rw_len1; |
| |
| tx_sw_if_index1 = adj1[0].rewrite_header.sw_if_index; |
| vnet_buffer (b[1])->sw_if_index[VLIB_TX] = tx_sw_if_index1; |
| |
| if (PREDICT_FALSE |
| (adj1[0].rewrite_header.flags & VNET_REWRITE_HAS_FEATURES)) |
| vnet_feature_arc_start (lm->output_feature_arc_index, |
| tx_sw_if_index1, &next_index, b[1]); |
| next[1] = next_index; |
| } |
| |
| /* Guess we are only writing on simple Ethernet header. */ |
| vnet_rewrite_two_headers (adj0[0], adj1[0], |
| ip0, ip1, sizeof (ethernet_header_t)); |
| |
| /* |
| * Bump the per-adjacency counters |
| */ |
| if (do_counters) |
| { |
| vlib_increment_combined_counter |
| (&adjacency_counters, |
| thread_index, |
| adj_index0, 1, vlib_buffer_length_in_chain (vm, b[0]) + rw_len0); |
| |
| vlib_increment_combined_counter |
| (&adjacency_counters, |
| thread_index, |
| adj_index1, 1, vlib_buffer_length_in_chain (vm, b[1]) + rw_len1); |
| } |
| |
| if (is_midchain) |
| { |
| adj0->sub_type.midchain.fixup_func |
| (vm, adj0, b[0], adj0->sub_type.midchain.fixup_data); |
| adj1->sub_type.midchain.fixup_func |
| (vm, adj1, b[1], adj1->sub_type.midchain.fixup_data); |
| } |
| |
| if (is_mcast) |
| { |
| /* |
| * copy bytes from the IP address into the MAC rewrite |
| */ |
| vnet_ip_mcast_fixup_header (IP4_MCAST_ADDR_MASK, |
| adj0->rewrite_header.dst_mcast_offset, |
| &ip0->dst_address.as_u32, (u8 *) ip0); |
| vnet_ip_mcast_fixup_header (IP4_MCAST_ADDR_MASK, |
| adj1->rewrite_header.dst_mcast_offset, |
| &ip1->dst_address.as_u32, (u8 *) ip1); |
| } |
| |
| next += 2; |
| b += 2; |
| n_left_from -= 2; |
| } |
| |
| while (n_left_from > 0) |
| { |
| ip_adjacency_t *adj0; |
| ip4_header_t *ip0; |
| u32 rw_len0, adj_index0, error0; |
| u32 tx_sw_if_index0; |
| |
| adj_index0 = vnet_buffer (b[0])->ip.adj_index[VLIB_TX]; |
| |
| adj0 = adj_get (adj_index0); |
| |
| if (do_counters) |
| vlib_prefetch_combined_counter (&adjacency_counters, |
| thread_index, adj_index0); |
| |
| ip0 = vlib_buffer_get_current (b[0]); |
| |
| error0 = IP4_ERROR_NONE; |
| |
| ip4_ttl_and_checksum_check (b[0], ip0, next + 0, &error0); |
| |
| |
| /* Update packet buffer attributes/set output interface. */ |
| rw_len0 = adj0[0].rewrite_header.data_bytes; |
| vnet_buffer (b[0])->ip.save_rewrite_length = rw_len0; |
| |
| /* Check MTU of outgoing interface. */ |
| ip4_mtu_check (b[0], clib_net_to_host_u16 (ip0->length), |
| adj0[0].rewrite_header.max_l3_packet_bytes, |
| ip0->flags_and_fragment_offset & |
| clib_host_to_net_u16 (IP4_HEADER_FLAG_DONT_FRAGMENT), |
| next + 0, &error0); |
| |
| if (is_mcast) |
| { |
| error0 = ((adj0[0].rewrite_header.sw_if_index == |
| vnet_buffer (b[0])->sw_if_index[VLIB_RX]) ? |
| IP4_ERROR_SAME_INTERFACE : error0); |
| } |
| b[0]->error = error_node->errors[error0]; |
| |
| /* Don't adjust the buffer for ttl issue; icmp-error node wants |
| * to see the IP headerr */ |
| if (PREDICT_TRUE (error0 == IP4_ERROR_NONE)) |
| { |
| u32 next_index = adj0[0].rewrite_header.next_index; |
| b[0]->current_data -= rw_len0; |
| b[0]->current_length += rw_len0; |
| tx_sw_if_index0 = adj0[0].rewrite_header.sw_if_index; |
| vnet_buffer (b[0])->sw_if_index[VLIB_TX] = tx_sw_if_index0; |
| |
| if (PREDICT_FALSE |
| (adj0[0].rewrite_header.flags & VNET_REWRITE_HAS_FEATURES)) |
| vnet_feature_arc_start (lm->output_feature_arc_index, |
| tx_sw_if_index0, &next_index, b[0]); |
| next[0] = next_index; |
| } |
| |
| /* Guess we are only writing on simple Ethernet header. */ |
| vnet_rewrite_one_header (adj0[0], ip0, sizeof (ethernet_header_t)); |
| |
| if (do_counters) |
| vlib_increment_combined_counter |
| (&adjacency_counters, |
| thread_index, adj_index0, 1, |
| vlib_buffer_length_in_chain (vm, b[0]) + rw_len0); |
| |
| if (is_midchain) |
| { |
| adj0->sub_type.midchain.fixup_func |
| (vm, adj0, b[0], adj0->sub_type.midchain.fixup_data); |
| } |
| |
| if (is_mcast) |
| { |
| /* |
| * copy bytes from the IP address into the MAC rewrite |
| */ |
| vnet_ip_mcast_fixup_header (IP4_MCAST_ADDR_MASK, |
| adj0->rewrite_header.dst_mcast_offset, |
| &ip0->dst_address.as_u32, (u8 *) ip0); |
| } |
| |
| next += 1; |
| b += 1; |
| n_left_from -= 1; |
| } |
| |
| |
| /* Need to do trace after rewrites to pick up new packet data. */ |
| if (node->flags & VLIB_NODE_FLAG_TRACE) |
| ip4_forward_next_trace (vm, node, frame, VLIB_TX); |
| |
| vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors); |
| return frame->n_vectors; |
| } |
| |
| |
| /** @brief IPv4 rewrite node. |
| @node ip4-rewrite |
| |
| This is the IPv4 transit-rewrite node: decrement TTL, fix the ipv4 |
| header checksum, fetch the ip adjacency, check the outbound mtu, |
| apply the adjacency rewrite, and send pkts to the adjacency |
| rewrite header's rewrite_next_index. |
| |
| @param vm vlib_main_t corresponding to the current thread |
| @param node vlib_node_runtime_t |
| @param frame vlib_frame_t whose contents should be dispatched |
| |
| @par Graph mechanics: buffer metadata, next index usage |
| |
| @em Uses: |
| - <code>vnet_buffer(b)->ip.adj_index[VLIB_TX]</code> |
| - the rewrite adjacency index |
| - <code>adj->lookup_next_index</code> |
| - Must be IP_LOOKUP_NEXT_REWRITE or IP_LOOKUP_NEXT_ARP, otherwise |
| the packet will be dropped. |
| - <code>adj->rewrite_header</code> |
| - Rewrite string length, rewrite string, next_index |
| |
| @em Sets: |
| - <code>b->current_data, b->current_length</code> |
| - Updated net of applying the rewrite string |
| |
| <em>Next Indices:</em> |
| - <code> adj->rewrite_header.next_index </code> |
| or @c ip4-drop |
| */ |
| |
| VLIB_NODE_FN (ip4_rewrite_node) (vlib_main_t * vm, vlib_node_runtime_t * node, |
| vlib_frame_t * frame) |
| { |
| if (adj_are_counters_enabled ()) |
| return ip4_rewrite_inline (vm, node, frame, 1, 0, 0); |
| else |
| return ip4_rewrite_inline (vm, node, frame, 0, 0, 0); |
| } |
| |
| VLIB_NODE_FN (ip4_rewrite_bcast_node) (vlib_main_t * vm, |
| vlib_node_runtime_t * node, |
| vlib_frame_t * frame) |
| { |
| if (adj_are_counters_enabled ()) |
| return ip4_rewrite_inline (vm, node, frame, 1, 0, 0); |
| else |
| return ip4_rewrite_inline (vm, node, frame, 0, 0, 0); |
| } |
| |
| VLIB_NODE_FN (ip4_midchain_node) (vlib_main_t * vm, |
| vlib_node_runtime_t * node, |
| vlib_frame_t * frame) |
| { |
| if (adj_are_counters_enabled ()) |
| return ip4_rewrite_inline (vm, node, frame, 1, 1, 0); |
| else |
| return ip4_rewrite_inline (vm, node, frame, 0, 1, 0); |
| } |
| |
| VLIB_NODE_FN (ip4_rewrite_mcast_node) (vlib_main_t * vm, |
| vlib_node_runtime_t * node, |
| vlib_frame_t * frame) |
| { |
| if (adj_are_counters_enabled ()) |
| return ip4_rewrite_inline (vm, node, frame, 1, 0, 1); |
| else |
| return ip4_rewrite_inline (vm, node, frame, 0, 0, 1); |
| } |
| |
| VLIB_NODE_FN (ip4_mcast_midchain_node) (vlib_main_t * vm, |
| vlib_node_runtime_t * node, |
| vlib_frame_t * frame) |
| { |
| if (adj_are_counters_enabled ()) |
| return ip4_rewrite_inline (vm, node, frame, 1, 1, 1); |
| else |
| return ip4_rewrite_inline (vm, node, frame, 0, 1, 1); |
| } |
| |
| /* *INDENT-OFF* */ |
| VLIB_REGISTER_NODE (ip4_rewrite_node) = { |
| .name = "ip4-rewrite", |
| .vector_size = sizeof (u32), |
| |
| .format_trace = format_ip4_rewrite_trace, |
| |
| .n_next_nodes = IP4_REWRITE_N_NEXT, |
| .next_nodes = { |
| [IP4_REWRITE_NEXT_DROP] = "ip4-drop", |
| [IP4_REWRITE_NEXT_ICMP_ERROR] = "ip4-icmp-error", |
| [IP4_REWRITE_NEXT_FRAGMENT] = "ip4-frag", |
| }, |
| }; |
| |
| VLIB_REGISTER_NODE (ip4_rewrite_bcast_node) = { |
| .name = "ip4-rewrite-bcast", |
| .vector_size = sizeof (u32), |
| |
| .format_trace = format_ip4_rewrite_trace, |
| .sibling_of = "ip4-rewrite", |
| }; |
| |
| VLIB_REGISTER_NODE (ip4_rewrite_mcast_node) = { |
| .name = "ip4-rewrite-mcast", |
| .vector_size = sizeof (u32), |
| |
| .format_trace = format_ip4_rewrite_trace, |
| .sibling_of = "ip4-rewrite", |
| }; |
| |
| VLIB_REGISTER_NODE (ip4_mcast_midchain_node) = { |
| .name = "ip4-mcast-midchain", |
| .vector_size = sizeof (u32), |
| |
| .format_trace = format_ip4_rewrite_trace, |
| .sibling_of = "ip4-rewrite", |
| }; |
| |
| VLIB_REGISTER_NODE (ip4_midchain_node) = { |
| .name = "ip4-midchain", |
| .vector_size = sizeof (u32), |
| .format_trace = format_ip4_forward_next_trace, |
| .sibling_of = "ip4-rewrite", |
| }; |
| /* *INDENT-ON */ |
| |
| static int |
| ip4_lookup_validate (ip4_address_t * a, u32 fib_index0) |
| { |
| ip4_fib_mtrie_t *mtrie0; |
| ip4_fib_mtrie_leaf_t leaf0; |
| u32 lbi0; |
| |
| mtrie0 = &ip4_fib_get (fib_index0)->mtrie; |
| |
| leaf0 = ip4_fib_mtrie_lookup_step_one (mtrie0, a); |
| leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, a, 2); |
| leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, a, 3); |
| |
| lbi0 = ip4_fib_mtrie_leaf_get_adj_index (leaf0); |
| |
| return lbi0 == ip4_fib_table_lookup_lb (ip4_fib_get (fib_index0), a); |
| } |
| |
| static clib_error_t * |
| test_lookup_command_fn (vlib_main_t * vm, |
| unformat_input_t * input, vlib_cli_command_t * cmd) |
| { |
| ip4_fib_t *fib; |
| u32 table_id = 0; |
| f64 count = 1; |
| u32 n; |
| int i; |
| ip4_address_t ip4_base_address; |
| u64 errors = 0; |
| |
| while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT) |
| { |
| if (unformat (input, "table %d", &table_id)) |
| { |
| /* Make sure the entry exists. */ |
| fib = ip4_fib_get (table_id); |
| if ((fib) && (fib->index != table_id)) |
| return clib_error_return (0, "<fib-index> %d does not exist", |
| table_id); |
| } |
| else if (unformat (input, "count %f", &count)) |
| ; |
| |
| else if (unformat (input, "%U", |
| unformat_ip4_address, &ip4_base_address)) |
| ; |
| else |
| return clib_error_return (0, "unknown input `%U'", |
| format_unformat_error, input); |
| } |
| |
| n = count; |
| |
| for (i = 0; i < n; i++) |
| { |
| if (!ip4_lookup_validate (&ip4_base_address, table_id)) |
| errors++; |
| |
| ip4_base_address.as_u32 = |
| clib_host_to_net_u32 (1 + |
| clib_net_to_host_u32 (ip4_base_address.as_u32)); |
| } |
| |
| if (errors) |
| vlib_cli_output (vm, "%llu errors out of %d lookups\n", errors, n); |
| else |
| vlib_cli_output (vm, "No errors in %d lookups\n", n); |
| |
| return 0; |
| } |
| |
| /*? |
| * Perform a lookup of an IPv4 Address (or range of addresses) in the |
| * given FIB table to determine if there is a conflict with the |
| * adjacency table. The fib-id can be determined by using the |
| * '<em>show ip fib</em>' command. If fib-id is not entered, default value |
| * of 0 is used. |
| * |
| * @todo This command uses fib-id, other commands use table-id (not |
| * just a name, they are different indexes). Would like to change this |
| * to table-id for consistency. |
| * |
| * @cliexpar |
| * Example of how to run the test lookup command: |
| * @cliexstart{test lookup 172.16.1.1 table 1 count 2} |
| * No errors in 2 lookups |
| * @cliexend |
| ?*/ |
| /* *INDENT-OFF* */ |
| VLIB_CLI_COMMAND (lookup_test_command, static) = |
| { |
| .path = "test lookup", |
| .short_help = "test lookup <ipv4-addr> [table <fib-id>] [count <nn>]", |
| .function = test_lookup_command_fn, |
| }; |
| /* *INDENT-ON* */ |
| |
| #ifndef CLIB_MARCH_VARIANT |
| int |
| vnet_set_ip4_flow_hash (u32 table_id, u32 flow_hash_config) |
| { |
| u32 fib_index; |
| |
| fib_index = fib_table_find (FIB_PROTOCOL_IP4, table_id); |
| |
| if (~0 == fib_index) |
| return VNET_API_ERROR_NO_SUCH_FIB; |
| |
| fib_table_set_flow_hash_config (fib_index, FIB_PROTOCOL_IP4, |
| flow_hash_config); |
| |
| return 0; |
| } |
| #endif |
| |
| static clib_error_t * |
| set_ip_flow_hash_command_fn (vlib_main_t * vm, |
| unformat_input_t * input, |
| vlib_cli_command_t * cmd) |
| { |
| int matched = 0; |
| u32 table_id = 0; |
| u32 flow_hash_config = 0; |
| int rv; |
| |
| while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT) |
| { |
| if (unformat (input, "table %d", &table_id)) |
| matched = 1; |
| #define _(a,v) \ |
| else if (unformat (input, #a)) { flow_hash_config |= v; matched=1;} |
| foreach_flow_hash_bit |
| #undef _ |
| else |
| break; |
| } |
| |
| if (matched == 0) |
| return clib_error_return (0, "unknown input `%U'", |
| format_unformat_error, input); |
| |
| rv = vnet_set_ip4_flow_hash (table_id, flow_hash_config); |
| switch (rv) |
| { |
| case 0: |
| break; |
| |
| case VNET_API_ERROR_NO_SUCH_FIB: |
| return clib_error_return (0, "no such FIB table %d", table_id); |
| |
| default: |
| clib_warning ("BUG: illegal flow hash config 0x%x", flow_hash_config); |
| break; |
| } |
| |
| return 0; |
| } |
| |
| /*? |
| * Configure the set of IPv4 fields used by the flow hash. |
| * |
| * @cliexpar |
| * Example of how to set the flow hash on a given table: |
| * @cliexcmd{set ip flow-hash table 7 dst sport dport proto} |
| * Example of display the configured flow hash: |
| * @cliexstart{show ip fib} |
| * ipv4-VRF:0, fib_index 0, flow hash: src dst sport dport proto |
| * 0.0.0.0/0 |
| * unicast-ip4-chain |
| * [@0]: dpo-load-balance: [index:0 buckets:1 uRPF:0 to:[0:0]] |
| * [0] [@0]: dpo-drop ip6 |
| * 0.0.0.0/32 |
| * unicast-ip4-chain |
| * [@0]: dpo-load-balance: [index:1 buckets:1 uRPF:1 to:[0:0]] |
| * [0] [@0]: dpo-drop ip6 |
| * 224.0.0.0/8 |
| * unicast-ip4-chain |
| * [@0]: dpo-load-balance: [index:3 buckets:1 uRPF:3 to:[0:0]] |
| * [0] [@0]: dpo-drop ip6 |
| * 6.0.1.2/32 |
| * unicast-ip4-chain |
| * [@0]: dpo-load-balance: [index:30 buckets:1 uRPF:29 to:[0:0]] |
| * [0] [@3]: arp-ipv4: via 6.0.0.1 af_packet0 |
| * 7.0.0.1/32 |
| * unicast-ip4-chain |
| * [@0]: dpo-load-balance: [index:31 buckets:4 uRPF:30 to:[0:0]] |
| * [0] [@3]: arp-ipv4: via 6.0.0.2 af_packet0 |
| * [1] [@3]: arp-ipv4: via 6.0.0.2 af_packet0 |
| * [2] [@3]: arp-ipv4: via 6.0.0.2 af_packet0 |
| * [3] [@3]: arp-ipv4: via 6.0.0.1 af_packet0 |
| * 240.0.0.0/8 |
| * unicast-ip4-chain |
| * [@0]: dpo-load-balance: [index:2 buckets:1 uRPF:2 to:[0:0]] |
| * [0] [@0]: dpo-drop ip6 |
| * 255.255.255.255/32 |
| * unicast-ip4-chain |
| * [@0]: dpo-load-balance: [index:4 buckets:1 uRPF:4 to:[0:0]] |
| * [0] [@0]: dpo-drop ip6 |
| * ipv4-VRF:7, fib_index 1, flow hash: dst sport dport proto |
| * 0.0.0.0/0 |
| * unicast-ip4-chain |
| * [@0]: dpo-load-balance: [index:12 buckets:1 uRPF:11 to:[0:0]] |
| * [0] [@0]: dpo-drop ip6 |
| * 0.0.0.0/32 |
| * unicast-ip4-chain |
| * [@0]: dpo-load-balance: [index:13 buckets:1 uRPF:12 to:[0:0]] |
| * [0] [@0]: dpo-drop ip6 |
| * 172.16.1.0/24 |
| * unicast-ip4-chain |
| * [@0]: dpo-load-balance: [index:17 buckets:1 uRPF:16 to:[0:0]] |
| * [0] [@4]: ipv4-glean: af_packet0 |
| * 172.16.1.1/32 |
| * unicast-ip4-chain |
| * [@0]: dpo-load-balance: [index:18 buckets:1 uRPF:17 to:[1:84]] |
| * [0] [@2]: dpo-receive: 172.16.1.1 on af_packet0 |
| * 172.16.1.2/32 |
| * unicast-ip4-chain |
| * [@0]: dpo-load-balance: [index:21 buckets:1 uRPF:20 to:[0:0]] |
| * [0] [@5]: ipv4 via 172.16.1.2 af_packet0: IP4: 02:fe:9e:70:7a:2b -> 26:a5:f6:9c:3a:36 |
| * 172.16.2.0/24 |
| * unicast-ip4-chain |
| * [@0]: dpo-load-balance: [index:19 buckets:1 uRPF:18 to:[0:0]] |
| * [0] [@4]: ipv4-glean: af_packet1 |
| * 172.16.2.1/32 |
| * unicast-ip4-chain |
| * [@0]: dpo-load-balance: [index:20 buckets:1 uRPF:19 to:[0:0]] |
| * [0] [@2]: dpo-receive: 172.16.2.1 on af_packet1 |
| * 224.0.0.0/8 |
| * unicast-ip4-chain |
| * [@0]: dpo-load-balance: [index:15 buckets:1 uRPF:14 to:[0:0]] |
| * [0] [@0]: dpo-drop ip6 |
| * 240.0.0.0/8 |
| * unicast-ip4-chain |
| * [@0]: dpo-load-balance: [index:14 buckets:1 uRPF:13 to:[0:0]] |
| * [0] [@0]: dpo-drop ip6 |
| * 255.255.255.255/32 |
| * unicast-ip4-chain |
| * [@0]: dpo-load-balance: [index:16 buckets:1 uRPF:15 to:[0:0]] |
| * [0] [@0]: dpo-drop ip6 |
| * @cliexend |
| ?*/ |
| /* *INDENT-OFF* */ |
| VLIB_CLI_COMMAND (set_ip_flow_hash_command, static) = |
| { |
| .path = "set ip flow-hash", |
| .short_help = |
| "set ip flow-hash table <table-id> [src] [dst] [sport] [dport] [proto] [reverse]", |
| .function = set_ip_flow_hash_command_fn, |
| }; |
| /* *INDENT-ON* */ |
| |
| #ifndef CLIB_MARCH_VARIANT |
| int |
| vnet_set_ip4_classify_intfc (vlib_main_t * vm, u32 sw_if_index, |
| u32 table_index) |
| { |
| vnet_main_t *vnm = vnet_get_main (); |
| vnet_interface_main_t *im = &vnm->interface_main; |
| ip4_main_t *ipm = &ip4_main; |
| ip_lookup_main_t *lm = &ipm->lookup_main; |
| vnet_classify_main_t *cm = &vnet_classify_main; |
| ip4_address_t *if_addr; |
| |
| if (pool_is_free_index (im->sw_interfaces, sw_if_index)) |
| return VNET_API_ERROR_NO_MATCHING_INTERFACE; |
| |
| if (table_index != ~0 && pool_is_free_index (cm->tables, table_index)) |
| return VNET_API_ERROR_NO_SUCH_ENTRY; |
| |
| vec_validate (lm->classify_table_index_by_sw_if_index, sw_if_index); |
| lm->classify_table_index_by_sw_if_index[sw_if_index] = table_index; |
| |
| if_addr = ip4_interface_first_address (ipm, sw_if_index, NULL); |
| |
| if (NULL != if_addr) |
| { |
| fib_prefix_t pfx = { |
| .fp_len = 32, |
| .fp_proto = FIB_PROTOCOL_IP4, |
| .fp_addr.ip4 = *if_addr, |
| }; |
| u32 fib_index; |
| |
| fib_index = fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP4, |
| sw_if_index); |
| |
| |
| if (table_index != (u32) ~ 0) |
| { |
| dpo_id_t dpo = DPO_INVALID; |
| |
| dpo_set (&dpo, |
| DPO_CLASSIFY, |
| DPO_PROTO_IP4, |
| classify_dpo_create (DPO_PROTO_IP4, table_index)); |
| |
| fib_table_entry_special_dpo_add (fib_index, |
| &pfx, |
| FIB_SOURCE_CLASSIFY, |
| FIB_ENTRY_FLAG_NONE, &dpo); |
| dpo_reset (&dpo); |
| } |
| else |
| { |
| fib_table_entry_special_remove (fib_index, |
| &pfx, FIB_SOURCE_CLASSIFY); |
| } |
| } |
| |
| return 0; |
| } |
| #endif |
| |
| static clib_error_t * |
| set_ip_classify_command_fn (vlib_main_t * vm, |
| unformat_input_t * input, |
| vlib_cli_command_t * cmd) |
| { |
| u32 table_index = ~0; |
| int table_index_set = 0; |
| u32 sw_if_index = ~0; |
| int rv; |
| |
| while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT) |
| { |
| if (unformat (input, "table-index %d", &table_index)) |
| table_index_set = 1; |
| else if (unformat (input, "intfc %U", unformat_vnet_sw_interface, |
| vnet_get_main (), &sw_if_index)) |
| ; |
| else |
| break; |
| } |
| |
| if (table_index_set == 0) |
| return clib_error_return (0, "classify table-index must be specified"); |
| |
| if (sw_if_index == ~0) |
| return clib_error_return (0, "interface / subif must be specified"); |
| |
| rv = vnet_set_ip4_classify_intfc (vm, sw_if_index, table_index); |
| |
| switch (rv) |
| { |
| case 0: |
| break; |
| |
| case VNET_API_ERROR_NO_MATCHING_INTERFACE: |
| return clib_error_return (0, "No such interface"); |
| |
| case VNET_API_ERROR_NO_SUCH_ENTRY: |
| return clib_error_return (0, "No such classifier table"); |
| } |
| return 0; |
| } |
| |
| /*? |
| * Assign a classification table to an interface. The classification |
| * table is created using the '<em>classify table</em>' and '<em>classify session</em>' |
| * commands. Once the table is create, use this command to filter packets |
| * on an interface. |
| * |
| * @cliexpar |
| * Example of how to assign a classification table to an interface: |
| * @cliexcmd{set ip classify intfc GigabitEthernet2/0/0 table-index 1} |
| ?*/ |
| /* *INDENT-OFF* */ |
| VLIB_CLI_COMMAND (set_ip_classify_command, static) = |
| { |
| .path = "set ip classify", |
| .short_help = |
| "set ip classify intfc <interface> table-index <classify-idx>", |
| .function = set_ip_classify_command_fn, |
| }; |
| /* *INDENT-ON* */ |
| |
| static clib_error_t * |
| ip4_config (vlib_main_t * vm, unformat_input_t * input) |
| { |
| ip4_main_t *im = &ip4_main; |
| uword heapsize = 0; |
| |
| while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT) |
| { |
| if (unformat (input, "heap-size %U", unformat_memory_size, &heapsize)) |
| ; |
| else |
| return clib_error_return (0, |
| "invalid heap-size parameter `%U'", |
| format_unformat_error, input); |
| } |
| |
| im->mtrie_heap_size = heapsize; |
| |
| return 0; |
| } |
| |
| VLIB_EARLY_CONFIG_FUNCTION (ip4_config, "ip"); |
| |
| /* |
| * fd.io coding-style-patch-verification: ON |
| * |
| * Local Variables: |
| * eval: (c-set-style "gnu") |
| * End: |
| */ |