diff options
Diffstat (limited to 'vnet/vnet/ip/ip4_source_check.c')
| -rw-r--r-- | vnet/vnet/ip/ip4_source_check.c | 369 |
1 files changed, 369 insertions, 0 deletions
diff --git a/vnet/vnet/ip/ip4_source_check.c b/vnet/vnet/ip/ip4_source_check.c new file mode 100644 index 00000000000..47e22f2392e --- /dev/null +++ b/vnet/vnet/ip/ip4_source_check.c @@ -0,0 +1,369 @@ +/* + * 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_source_check.c: IP v4 check source address (unicast RPF check) + * + * 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/ip/ip.h> + +typedef struct { + u8 packet_data[64]; +} ip4_source_check_trace_t; + +static u8 * format_ip4_source_check_trace (u8 * s, va_list * va) +{ + CLIB_UNUSED (vlib_main_t * vm) = va_arg (*va, vlib_main_t *); + CLIB_UNUSED (vlib_node_t * node) = va_arg (*va, vlib_node_t *); + ip4_source_check_trace_t * t = va_arg (*va, ip4_source_check_trace_t *); + + s = format (s, "%U", + format_ip4_header, + t->packet_data, sizeof (t->packet_data)); + + return s; +} + +typedef enum { + IP4_SOURCE_CHECK_NEXT_DROP, + IP4_SOURCE_CHECK_N_NEXT, +} ip4_source_check_next_t; + +typedef enum { + IP4_SOURCE_CHECK_REACHABLE_VIA_RX, + IP4_SOURCE_CHECK_REACHABLE_VIA_ANY, +} ip4_source_check_type_t; + +typedef union { + struct { + u32 no_default_route : 1; + u32 fib_index : 31; + }; + u32 as_u32[1]; +} ip4_source_check_config_t; + +always_inline uword +ip4_source_check_inline (vlib_main_t * vm, + vlib_node_runtime_t * node, + vlib_frame_t * frame, + ip4_source_check_type_t source_check_type) +{ + ip4_main_t * im = &ip4_main; + ip_lookup_main_t * lm = &im->lookup_main; + ip_config_main_t * cm = &lm->rx_config_mains[VNET_UNICAST]; + u32 n_left_from, * from, * to_next; + u32 next_index; + vlib_node_runtime_t * error_node = vlib_node_get_runtime (vm, ip4_input_node.index); + + from = vlib_frame_vector_args (frame); + n_left_from = frame->n_vectors; + next_index = node->cached_next_index; + + if (node->flags & VLIB_NODE_FLAG_TRACE) + vlib_trace_frame_buffers_only (vm, node, from, frame->n_vectors, + /* stride */ 1, + sizeof (ip4_source_check_trace_t)); + + while (n_left_from > 0) + { + u32 n_left_to_next; + + vlib_get_next_frame (vm, node, next_index, + to_next, n_left_to_next); + + while (n_left_from >= 4 && n_left_to_next >= 2) + { + vlib_buffer_t * p0, * p1; + ip4_header_t * ip0, * ip1; + ip4_fib_mtrie_t * mtrie0, * mtrie1; + ip4_fib_mtrie_leaf_t leaf0, leaf1; + ip4_source_check_config_t * c0, * c1; + ip_adjacency_t * adj0, * adj1; + u32 pi0, next0, pass0, adj_index0; + u32 pi1, next1, pass1, adj_index1; + + /* 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, LOAD); + vlib_prefetch_buffer_header (p3, LOAD); + + CLIB_PREFETCH (p2->data, sizeof (ip0[0]), LOAD); + CLIB_PREFETCH (p3->data, sizeof (ip1[0]), LOAD); + } + + pi0 = to_next[0] = from[0]; + pi1 = to_next[1] = from[1]; + from += 2; + to_next += 2; + n_left_from -= 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); + + c0 = vnet_get_config_data (&cm->config_main, + &vnet_buffer (p0)->ip.current_config_index, + &next0, + sizeof (c0[0])); + c1 = vnet_get_config_data (&cm->config_main, + &vnet_buffer (p1)->ip.current_config_index, + &next1, + sizeof (c1[0])); + + mtrie0 = &vec_elt_at_index (im->fibs, c0->fib_index)->mtrie; + mtrie1 = &vec_elt_at_index (im->fibs, c1->fib_index)->mtrie; + + leaf0 = leaf1 = IP4_FIB_MTRIE_LEAF_ROOT; + + leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, &ip0->src_address, 0); + leaf1 = ip4_fib_mtrie_lookup_step (mtrie1, leaf1, &ip1->src_address, 0); + + leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, &ip0->src_address, 1); + leaf1 = ip4_fib_mtrie_lookup_step (mtrie1, leaf1, &ip1->src_address, 1); + + leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, &ip0->src_address, 2); + leaf1 = ip4_fib_mtrie_lookup_step (mtrie1, leaf1, &ip1->src_address, 2); + + leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, &ip0->src_address, 3); + leaf1 = ip4_fib_mtrie_lookup_step (mtrie1, leaf1, &ip1->src_address, 3); + + adj_index0 = ip4_fib_mtrie_leaf_get_adj_index (leaf0); + adj_index1 = ip4_fib_mtrie_leaf_get_adj_index (leaf1); + + ASSERT (adj_index0 == ip4_fib_lookup_with_table (im, c0->fib_index, + &ip0->src_address, + c0->no_default_route)); + ASSERT (adj_index1 == ip4_fib_lookup_with_table (im, c1->fib_index, + &ip1->src_address, + c1->no_default_route)); + + adj0 = ip_get_adjacency (lm, adj_index0); + adj1 = ip_get_adjacency (lm, adj_index1); + + /* Pass multicast. */ + pass0 = ip4_address_is_multicast (&ip0->src_address) || ip0->src_address.as_u32 == clib_host_to_net_u32(0xFFFFFFFF); + pass1 = ip4_address_is_multicast (&ip1->src_address) || ip1->src_address.as_u32 == clib_host_to_net_u32(0xFFFFFFFF); + + pass0 |= (adj0->lookup_next_index == IP_LOOKUP_NEXT_REWRITE + && (source_check_type == IP4_SOURCE_CHECK_REACHABLE_VIA_ANY + || vnet_buffer (p0)->sw_if_index[VLIB_RX] == adj0->rewrite_header.sw_if_index)); + pass1 |= (adj1->lookup_next_index == IP_LOOKUP_NEXT_REWRITE + && (source_check_type == IP4_SOURCE_CHECK_REACHABLE_VIA_ANY + || vnet_buffer (p1)->sw_if_index[VLIB_RX] == adj1->rewrite_header.sw_if_index)); + + next0 = (pass0 ? next0 : IP4_SOURCE_CHECK_NEXT_DROP); + next1 = (pass1 ? next1 : IP4_SOURCE_CHECK_NEXT_DROP); + + p0->error = error_node->errors[IP4_ERROR_UNICAST_SOURCE_CHECK_FAILS]; + p1->error = error_node->errors[IP4_ERROR_UNICAST_SOURCE_CHECK_FAILS]; + + vlib_validate_buffer_enqueue_x2 (vm, node, next_index, + to_next, n_left_to_next, + pi0, pi1, next0, next1); + } + + while (n_left_from > 0 && n_left_to_next > 0) + { + vlib_buffer_t * p0; + ip4_header_t * ip0; + ip4_fib_mtrie_t * mtrie0; + ip4_fib_mtrie_leaf_t leaf0; + ip4_source_check_config_t * c0; + ip_adjacency_t * adj0; + u32 pi0, next0, pass0, adj_index0; + + pi0 = from[0]; + to_next[0] = pi0; + from += 1; + to_next += 1; + n_left_from -= 1; + n_left_to_next -= 1; + + p0 = vlib_get_buffer (vm, pi0); + ip0 = vlib_buffer_get_current (p0); + + c0 = vnet_get_config_data (&cm->config_main, + &vnet_buffer (p0)->ip.current_config_index, + &next0, + sizeof (c0[0])); + + mtrie0 = &vec_elt_at_index (im->fibs, c0->fib_index)->mtrie; + + leaf0 = IP4_FIB_MTRIE_LEAF_ROOT; + + leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, &ip0->src_address, 0); + + leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, &ip0->src_address, 1); + + leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, &ip0->src_address, 2); + + leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, &ip0->src_address, 3); + + adj_index0 = ip4_fib_mtrie_leaf_get_adj_index (leaf0); + + ASSERT (adj_index0 == ip4_fib_lookup_with_table (im, c0->fib_index, + &ip0->src_address, + c0->no_default_route)); + adj0 = ip_get_adjacency (lm, adj_index0); + + /* Pass multicast. */ + pass0 = ip4_address_is_multicast (&ip0->src_address) || ip0->src_address.as_u32 == clib_host_to_net_u32(0xFFFFFFFF); + + pass0 |= (adj0->lookup_next_index == IP_LOOKUP_NEXT_REWRITE + && (source_check_type == IP4_SOURCE_CHECK_REACHABLE_VIA_ANY + || vnet_buffer (p0)->sw_if_index[VLIB_RX] == adj0->rewrite_header.sw_if_index)); + + next0 = (pass0 ? next0 : IP4_SOURCE_CHECK_NEXT_DROP); + p0->error = error_node->errors[IP4_ERROR_UNICAST_SOURCE_CHECK_FAILS]; + + vlib_validate_buffer_enqueue_x1 (vm, node, next_index, + to_next, n_left_to_next, + pi0, next0); + } + + vlib_put_next_frame (vm, node, next_index, n_left_to_next); + } + + return frame->n_vectors; +} + +static uword +ip4_source_check_reachable_via_any (vlib_main_t * vm, + vlib_node_runtime_t * node, + vlib_frame_t * frame) +{ + return ip4_source_check_inline (vm, node, frame, IP4_SOURCE_CHECK_REACHABLE_VIA_ANY); +} + +static uword +ip4_source_check_reachable_via_rx (vlib_main_t * vm, + vlib_node_runtime_t * node, + vlib_frame_t * frame) +{ + return ip4_source_check_inline (vm, node, frame, IP4_SOURCE_CHECK_REACHABLE_VIA_RX); +} + +VLIB_REGISTER_NODE (ip4_check_source_reachable_via_any) = { + .function = ip4_source_check_reachable_via_any, + .name = "ip4-source-check-via-any", + .vector_size = sizeof (u32), + + .n_next_nodes = IP4_SOURCE_CHECK_N_NEXT, + .next_nodes = { + [IP4_SOURCE_CHECK_NEXT_DROP] = "error-drop", + }, + + .format_buffer = format_ip4_header, + .format_trace = format_ip4_source_check_trace, +}; + +VLIB_REGISTER_NODE (ip4_check_source_reachable_via_rx) = { + .function = ip4_source_check_reachable_via_rx, + .name = "ip4-source-check-via-rx", + .vector_size = sizeof (u32), + + .n_next_nodes = IP4_SOURCE_CHECK_N_NEXT, + .next_nodes = { + [IP4_SOURCE_CHECK_NEXT_DROP] = "error-drop", + }, + + .format_buffer = format_ip4_header, + .format_trace = format_ip4_source_check_trace, +}; + +static clib_error_t * +set_ip_source_check (vlib_main_t * vm, + unformat_input_t * input, + vlib_cli_command_t * cmd) +{ + vnet_main_t * vnm = vnet_get_main(); + ip4_main_t * im = &ip4_main; + ip_lookup_main_t * lm = &im->lookup_main; + ip_config_main_t * rx_cm = &lm->rx_config_mains[VNET_UNICAST]; + clib_error_t * error = 0; + u32 sw_if_index, is_del, ci; + ip4_source_check_config_t config; + ip4_rx_feature_type_t type; + + sw_if_index = ~0; + + if (! unformat_user (input, unformat_vnet_sw_interface, vnm, &sw_if_index)) + { + error = clib_error_return (0, "unknown interface `%U'", + format_unformat_error, input); + goto done; + } + + is_del = 0; + config.no_default_route = 0; + config.fib_index = im->fib_index_by_sw_if_index[sw_if_index]; + type = IP4_RX_FEATURE_SOURCE_CHECK_REACHABLE_VIA_RX; + if (unformat (input, "del")) + is_del = 1; + + ci = rx_cm->config_index_by_sw_if_index[sw_if_index]; + ci = (is_del + ? vnet_config_del_feature + : vnet_config_add_feature) + (vm, &rx_cm->config_main, + ci, + type, + &config, + sizeof (config)); + rx_cm->config_index_by_sw_if_index[sw_if_index] = ci; + + done: + return error; +} + +VLIB_CLI_COMMAND (set_interface_ip_source_check_command, static) = { + .path = "set interface ip source-check", + .function = set_ip_source_check, + .short_help = "Set IP4/IP6 interface unicast source check", +}; + +/* Dummy init function to get us linked in. */ +clib_error_t * ip4_source_check_init (vlib_main_t * vm) +{ return 0; } + +VLIB_INIT_FUNCTION (ip4_source_check_init); |