/* * Copyright (c) 2016 Cisco and/or its affiliates. * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at: * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ #include #include #include #include #include /** * @file * @brief IPv4 Source and Port Range Checking. * * This file contains the source code for IPv4 source and port range * checking. */ /** * @brief The pool of range chack DPOs */ static protocol_port_range_dpo_t *ppr_dpo_pool; /** * @brief Dynamically registered DPO type */ static dpo_type_t ppr_dpo_type; vlib_node_registration_t ip4_source_port_and_range_check_rx; vlib_node_registration_t ip4_source_port_and_range_check_tx; #define foreach_ip4_source_and_port_range_check_error \ _(CHECK_FAIL, "ip4 source and port range check bad packets") \ _(CHECK_OK, "ip4 source and port range check good packets") typedef enum { #define _(sym,str) IP4_SOURCE_AND_PORT_RANGE_CHECK_ERROR_##sym, foreach_ip4_source_and_port_range_check_error #undef _ IP4_SOURCE_AND_PORT_RANGE_CHECK_N_ERROR, } ip4_source_and_port_range_check_error_t; static char *ip4_source_and_port_range_check_error_strings[] = { #define _(sym,string) string, foreach_ip4_source_and_port_range_check_error #undef _ }; typedef struct { u32 pass; u32 bypass; u32 is_tcp; ip4_address_t src_addr; u16 port; u32 fib_index; } ip4_source_and_port_range_check_trace_t; static u8 * format_ip4_source_and_port_range_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_and_port_range_check_trace_t *t = va_arg (*va, ip4_source_and_port_range_check_trace_t *); if (t->bypass) s = format (s, "PASS (bypass case)"); else s = format (s, "fib %d src ip %U %s dst port %d: %s", t->fib_index, format_ip4_address, &t->src_addr, t->is_tcp ? "TCP" : "UDP", (u32) t->port, (t->pass == 1) ? "PASS" : "FAIL"); return s; } typedef enum { IP4_SOURCE_AND_PORT_RANGE_CHECK_NEXT_DROP, IP4_SOURCE_AND_PORT_RANGE_CHECK_N_NEXT, } ip4_source_and_port_range_check_next_t; static inline u32 check_adj_port_range_x1 (const protocol_port_range_dpo_t * ppr_dpo, u16 dst_port, u32 next) { u16x8vec_t key; u16x8vec_t diff1; u16x8vec_t diff2; u16x8vec_t sum, sum_equal_diff2; u16 sum_nonzero, sum_equal, winner_mask; int i; if (NULL == ppr_dpo || dst_port == 0) return IP4_SOURCE_AND_PORT_RANGE_CHECK_NEXT_DROP; /* Make the obvious screw-case work. A variant also works w/ no MMX */ if (PREDICT_FALSE (dst_port == 65535)) { int j; for (i = 0; i < VLIB_BUFFER_PRE_DATA_SIZE / sizeof (protocol_port_range_t); i++) { for (j = 0; j < 8; j++) if (ppr_dpo->blocks[i].low.as_u16[j] == 65535) return next; } return IP4_SOURCE_AND_PORT_RANGE_CHECK_NEXT_DROP; } key.as_u16x8 = u16x8_splat (dst_port); for (i = 0; i < ppr_dpo->n_used_blocks; i++) { diff1.as_u16x8 = u16x8_sub_saturate (ppr_dpo->blocks[i].low.as_u16x8, key.as_u16x8); diff2.as_u16x8 = u16x8_sub_saturate (ppr_dpo->blocks[i].hi.as_u16x8, key.as_u16x8); sum.as_u16x8 = u16x8_add (diff1.as_u16x8, diff2.as_u16x8); sum_equal_diff2.as_u16x8 = u16x8_is_equal (sum.as_u16x8, diff2.as_u16x8); sum_nonzero = ~u16x8_zero_byte_mask (sum.as_u16x8); sum_equal = ~u16x8_zero_byte_mask (sum_equal_diff2.as_u16x8); winner_mask = sum_nonzero & sum_equal; if (winner_mask) return next; } return IP4_SOURCE_AND_PORT_RANGE_CHECK_NEXT_DROP; } always_inline protocol_port_range_dpo_t * protocol_port_range_dpo_get (index_t index) { return (pool_elt_at_index (ppr_dpo_pool, index)); } always_inline uword ip4_source_and_port_range_check_inline (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame, int is_tx) { ip4_main_t *im = &ip4_main; u32 n_left_from, *from, *to_next; u32 next_index; vlib_node_runtime_t *error_node = node; u32 good_packets = 0; int i; from = vlib_frame_vector_args (frame); n_left_from = frame->n_vectors; next_index = node->cached_next_index; 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 *b0, *b1; */ /* ip4_header_t *ip0, *ip1; */ /* ip4_fib_mtrie_t *mtrie0, *mtrie1; */ /* ip4_fib_mtrie_leaf_t leaf0, leaf1; */ /* ip_source_and_port_range_check_config_t *c0, *c1; */ /* ip_adjacency_t *adj0 = 0, *adj1 = 0; */ /* u32 bi0, next0, adj_index0, pass0, save_next0, fib_index0; */ /* u32 bi1, next1, adj_index1, pass1, save_next1, fib_index1; */ /* udp_header_t *udp0, *udp1; */ /* /\* 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); */ /* } */ /* bi0 = to_next[0] = from[0]; */ /* bi1 = to_next[1] = from[1]; */ /* from += 2; */ /* to_next += 2; */ /* n_left_from -= 2; */ /* n_left_to_next -= 2; */ /* b0 = vlib_get_buffer (vm, bi0); */ /* b1 = vlib_get_buffer (vm, bi1); */ /* fib_index0 = */ /* vec_elt (im->fib_index_by_sw_if_index, */ /* vnet_buffer (b0)->sw_if_index[VLIB_RX]); */ /* fib_index1 = */ /* vec_elt (im->fib_index_by_sw_if_index, */ /* vnet_buffer (b1)->sw_if_index[VLIB_RX]); */ /* ip0 = vlib_buffer_get_current (b0); */ /* ip1 = vlib_buffer_get_current (b1); */ /* if (is_tx) */ /* { */ /* c0 = vnet_get_config_data (&tx_cm->config_main, */ /* &b0->current_config_index, */ /* &next0, sizeof (c0[0])); */ /* c1 = vnet_get_config_data (&tx_cm->config_main, */ /* &b1->current_config_index, */ /* &next1, sizeof (c1[0])); */ /* } */ /* else */ /* { */ /* c0 = vnet_get_config_data (&rx_cm->config_main, */ /* &b0->current_config_index, */ /* &next0, sizeof (c0[0])); */ /* c1 = vnet_get_config_data (&rx_cm->config_main, */ /* &b1->current_config_index, */ /* &next1, sizeof (c1[0])); */ /* } */ /* /\* we can't use the default VRF here... *\/ */ /* for (i = 0; i < IP_SOURCE_AND_PORT_RANGE_CHECK_N_PROTOCOLS; i++) */ /* { */ /* ASSERT (c0->fib_index[i] && c1->fib_index[i]); */ /* } */ /* if (is_tx) */ /* { */ /* if (ip0->protocol == IP_PROTOCOL_UDP) */ /* fib_index0 = */ /* c0->fib_index */ /* [IP_SOURCE_AND_PORT_RANGE_CHECK_PROTOCOL_UDP_IN]; */ /* if (ip0->protocol == IP_PROTOCOL_TCP) */ /* fib_index0 = */ /* c0->fib_index */ /* [IP_SOURCE_AND_PORT_RANGE_CHECK_PROTOCOL_TCP_IN]; */ /* } */ /* else */ /* { */ /* if (ip0->protocol == IP_PROTOCOL_UDP) */ /* fib_index0 = */ /* c0->fib_index */ /* [IP_SOURCE_AND_PORT_RANGE_CHECK_PROTOCOL_UDP_OUT]; */ /* if (ip0->protocol == IP_PROTOCOL_TCP) */ /* fib_index0 = */ /* c0->fib_index */ /* [IP_SOURCE_AND_PORT_RANGE_CHECK_PROTOCOL_TCP_OUT]; */ /* } */ /* if (PREDICT_TRUE (fib_index0 != ~0)) */ /* { */ /* mtrie0 = &vec_elt_at_index (im->fibs, fib_index0)->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, fib_index0, */ /* &ip0->src_address, */ /* 0 */ /* /\* use dflt rt *\/ */ /* )); */ /* adj0 = ip_get_adjacency (lm, adj_index0); */ /* } */ /* if (is_tx) */ /* { */ /* if (ip1->protocol == IP_PROTOCOL_UDP) */ /* fib_index1 = */ /* c1->fib_index */ /* [IP_SOURCE_AND_PORT_RANGE_CHECK_PROTOCOL_UDP_IN]; */ /* if (ip1->protocol == IP_PROTOCOL_TCP) */ /* fib_index1 = */ /* c1->fib_index */ /* [IP_SOURCE_AND_PORT_RANGE_CHECK_PROTOCOL_TCP_IN]; */ /* } */ /* else */ /* { */ /* if (ip1->protocol == IP_PROTOCOL_UDP) */ /* fib_index1 = */ /* c1->fib_index */ /* [IP_SOURCE_AND_PORT_RANGE_CHECK_PROTOCOL_UDP_OUT]; */ /* if (ip1->protocol == IP_PROTOCOL_TCP) */ /* fib_index1 = */ /* c1->fib_index */ /* [IP_SOURCE_AND_PORT_RANGE_CHECK_PROTOCOL_TCP_OUT]; */ /* } */ /* if (PREDICT_TRUE (fib_index1 != ~0)) */ /* { */ /* mtrie1 = &vec_elt_at_index (im->fibs, fib_index1)->mtrie; */ /* leaf1 = IP4_FIB_MTRIE_LEAF_ROOT; */ /* leaf1 = ip4_fib_mtrie_lookup_step (mtrie1, leaf1, */ /* &ip1->src_address, 0); */ /* leaf1 = ip4_fib_mtrie_lookup_step (mtrie1, leaf1, */ /* &ip1->src_address, 1); */ /* leaf1 = ip4_fib_mtrie_lookup_step (mtrie1, leaf1, */ /* &ip1->src_address, 2); */ /* leaf1 = ip4_fib_mtrie_lookup_step (mtrie1, leaf1, */ /* &ip1->src_address, 3); */ /* adj_index1 = ip4_fib_mtrie_leaf_get_adj_index (leaf1); */ /* ASSERT (adj_index1 == ip4_fib_lookup_with_table (im, fib_index1, */ /* &ip1->src_address, */ /* 0)); */ /* adj1 = ip_get_adjacency (lm, adj_index1); */ /* } */ /* pass0 = 0; */ /* pass0 |= adj0 == 0; */ /* pass0 |= ip4_address_is_multicast (&ip0->src_address); */ /* pass0 |= */ /* ip0->src_address.as_u32 == clib_host_to_net_u32 (0xFFFFFFFF); */ /* pass0 |= (ip0->protocol != IP_PROTOCOL_UDP) */ /* && (ip0->protocol != IP_PROTOCOL_TCP); */ /* pass1 = 0; */ /* pass1 |= adj1 == 0; */ /* pass1 |= ip4_address_is_multicast (&ip1->src_address); */ /* pass1 |= */ /* ip1->src_address.as_u32 == clib_host_to_net_u32 (0xFFFFFFFF); */ /* pass1 |= (ip1->protocol != IP_PROTOCOL_UDP) */ /* && (ip1->protocol != IP_PROTOCOL_TCP); */ /* save_next0 = next0; */ /* udp0 = ip4_next_header (ip0); */ /* save_next1 = next1; */ /* udp1 = ip4_next_header (ip1); */ /* if (PREDICT_TRUE (pass0 == 0)) */ /* { */ /* good_packets++; */ /* next0 = check_adj_port_range_x1 */ /* (adj0, clib_net_to_host_u16 (udp0->dst_port), next0); */ /* good_packets -= (save_next0 != next0); */ /* b0->error = error_node->errors */ /* [IP4_SOURCE_AND_PORT_RANGE_CHECK_ERROR_CHECK_FAIL]; */ /* } */ /* if (PREDICT_TRUE (pass1 == 0)) */ /* { */ /* good_packets++; */ /* next1 = check_adj_port_range_x1 */ /* (adj1, clib_net_to_host_u16 (udp1->dst_port), next1); */ /* good_packets -= (save_next1 != next1); */ /* b1->error = error_node->errors */ /* [IP4_SOURCE_AND_PORT_RANGE_CHECK_ERROR_CHECK_FAIL]; */ /* } */ /* if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) */ /* && (b0->flags & VLIB_BUFFER_IS_TRACED))) */ /* { */ /* ip4_source_and_port_range_check_trace_t *t = */ /* vlib_add_trace (vm, node, b0, sizeof (*t)); */ /* t->pass = next0 == save_next0; */ /* t->bypass = pass0; */ /* t->fib_index = fib_index0; */ /* t->src_addr.as_u32 = ip0->src_address.as_u32; */ /* t->port = (pass0 == 0) ? */ /* clib_net_to_host_u16 (udp0->dst_port) : 0; */ /* t->is_tcp = ip0->protocol == IP_PROTOCOL_TCP; */ /* } */ /* if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) */ /* && (b1->flags & VLIB_BUFFER_IS_TRACED))) */ /* { */ /* ip4_source_and_port_range_check_trace_t *t = */ /* vlib_add_trace (vm, node, b1, sizeof (*t)); */ /* t->pass = next1 == save_next1; */ /* t->bypass = pass1; */ /* t->fib_index = fib_index1; */ /* t->src_addr.as_u32 = ip1->src_address.as_u32; */ /* t->port = (pass1 == 0) ? */ /* clib_net_to_host_u16 (udp1->dst_port) : 0; */ /* t->is_tcp = ip1->protocol == IP_PROTOCOL_TCP; */ /* } */ /* vlib_validate_buffer_enqueue_x2 (vm, node, next_index, */ /* to_next, n_left_to_next, */ /* bi0, bi1, next0, next1); */ /* } */ while (n_left_from > 0 && n_left_to_next > 0) { vlib_buffer_t *b0; ip4_header_t *ip0; ip_source_and_port_range_check_config_t *c0; u32 bi0, next0, lb_index0, pass0, save_next0, fib_index0; udp_header_t *udp0; const protocol_port_range_dpo_t *ppr_dpo0 = NULL; const dpo_id_t *dpo; u32 sw_if_index0; bi0 = from[0]; to_next[0] = bi0; from += 1; to_next += 1; n_left_from -= 1; n_left_to_next -= 1; b0 = vlib_get_buffer (vm, bi0); sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX]; fib_index0 = vec_elt (im->fib_index_by_sw_if_index, sw_if_index0); if (is_tx) vlib_buffer_advance (b0, sizeof (ethernet_header_t)); ip0 = vlib_buffer_get_current (b0); c0 = vnet_feature_next_with_data (sw_if_index0, &next0, b0, sizeof (c0[0])); /* we can't use the default VRF here... */ for (i = 0; i < IP_SOURCE_AND_PORT_RANGE_CHECK_N_PROTOCOLS; i++) { ASSERT (c0->fib_index[i]); } if (is_tx) { if (ip0->protocol == IP_PROTOCOL_UDP) fib_index0 = c0->fib_index [IP_SOURCE_AND_PORT_RANGE_CHECK_PROTOCOL_UDP_IN]; if (ip0->protocol == IP_PROTOCOL_TCP) fib_index0 = c0->fib_index [IP_SOURCE_AND_PORT_RANGE_CHECK_PROTOCOL_TCP_IN]; } else { if (ip0->protocol == IP_PROTOCOL_UDP) fib_index0 = c0->fib_index [IP_SOURCE_AND_PORT_RANGE_CHECK_PROTOCOL_UDP_OUT]; if (ip0->protocol == IP_PROTOCOL_TCP) fib_index0 = c0->fib_index [IP_SOURCE_AND_PORT_RANGE_CHECK_PROTOCOL_TCP_OUT]; } if (fib_index0 != ~0) { lb_index0 = ip4_fib_forwarding_lookup (fib_index0, &ip0->src_address); dpo = load_balance_get_bucket_i (load_balance_get (lb_index0), 0); if (ppr_dpo_type == dpo->dpoi_type) { ppr_dpo0 = protocol_port_range_dpo_get (dpo->dpoi_index); } /* * else the lookup hit an enty that was no inserted * by this range checker, which is the default route */ } /* * $$$ which (src,dst) categories should we always pass? */ pass0 = 0; pass0 |= ip4_address_is_multicast (&ip0->src_address); pass0 |= ip0->src_address.as_u32 == clib_host_to_net_u32 (0xFFFFFFFF); pass0 |= (ip0->protocol != IP_PROTOCOL_UDP) && (ip0->protocol != IP_PROTOCOL_TCP); save_next0 = next0; udp0 = ip4_next_header (ip0); if (PREDICT_TRUE (pass0 == 0)) { good_packets++; next0 = check_adj_port_range_x1 (ppr_dpo0, clib_net_to_host_u16 (udp0->dst_port), next0); good_packets -= (save_next0 != next0); b0->error = error_node->errors [IP4_SOURCE_AND_PORT_RANGE_CHECK_ERROR_CHECK_FAIL]; } if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) && (b0->flags & VLIB_BUFFER_IS_TRACED))) { ip4_source_and_port_range_check_trace_t *t = vlib_add_trace (vm, node, b0, sizeof (*t)); t->pass = next0 == save_next0; t->bypass = pass0; t->fib_index = fib_index0; t->src_addr.as_u32 = ip0->src_address.as_u32; t->port = (pass0 == 0) ? clib_net_to_host_u16 (udp0->dst_port) : 0; t->is_tcp = ip0->protocol == IP_PROTOCOL_TCP; } if (is_tx) vlib_buffer_advance (b0, -sizeof (ethernet_header_t)); vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next, n_left_to_next, bi0, next0); } vlib_put_next_frame (vm, node, next_index, n_left_to_next); } if (is_tx) vlib_node_increment_counter (vm, ip4_source_port_and_range_check_tx.index, IP4_SOURCE_AND_PORT_RANGE_CHECK_ERROR_CHECK_OK, good_packets); else vlib_node_increment_counter (vm, ip4_source_port_and_range_check_rx.index, IP4_SOURCE_AND_PORT_RANGE_CHECK_ERROR_CHECK_OK, good_packets); return frame->n_vectors; } static uword ip4_source_and_port_range_check_rx (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame) { return ip4_source_and_port_range_check_inline (vm, node, frame, 0 /* !is_tx */ ); } static uword ip4_source_and_port_range_check_tx (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame) { return ip4_source_and_port_range_check_inline (vm, node, frame, 1 /* is_tx */ ); } /* Note: Calling same function for both RX and TX nodes as always checking dst_port, although if this changes can easily make new function */ /* *INDENT-OFF* */ VLIB_REGISTER_NODE (ip4_source_port_and_range_check_rx) = { .function = ip4_source_and_port_range_check_rx, .name = "ip4-source-and-port-range-check-rx", .vector_size = sizeof (u32), .n_errors = ARRAY_LEN(ip4_source_and_port_range_check_error_strings), .error_strings = ip4_source_and_port_range_check_error_strings, .n_next_nodes = IP4_SOURCE_AND_PORT_RANGE_CHECK_N_NEXT, .next_nodes = { [IP4_SOURCE_AND_PORT_RANGE_CHECK_NEXT_DROP] = "error-drop", }, .format_buffer = format_ip4_header, .format_trace = format_ip4_source_and_port_range_check_trace, }; /* *INDENT-ON* */ /* *INDENT-OFF* */ VLIB_REGISTER_NODE (ip4_source_port_and_range_check_tx) = { .function = ip4_source_and_port_range_check_tx, .name = "ip4-source-and-port-range-check-tx", .vector_size = sizeof (u32), .n_errors = ARRAY_LEN(ip4_source_and_port_range_check_error_strings), .error_strings = ip4_source_and_port_range_check_error_strings, .n_next_nodes = IP4_SOURCE_AND_PORT_RANGE_CHECK_N_NEXT, .next_nodes = { [IP4_SOURCE_AND_PORT_RANGE_CHECK_NEXT_DROP] = "error-drop", }, .format_buffer = format_ip4_header, .format_trace = format_ip4_source_and_port_range_check_trace, }; /* *INDENT-ON* */ int set_ip_source_and_port_range_check (vlib_main_t * vm, u32 * fib_index, u32 sw_if_index, u32 is_add) { ip_source_and_port_range_check_config_t config; int rv = 0; int i; for (i = 0; i < IP_SOURCE_AND_PORT_RANGE_CHECK_N_PROTOCOLS; i++) { config.fib_index[i] = fib_index[i]; } /* For OUT we are in the RX path */ if ((fib_index[IP_SOURCE_AND_PORT_RANGE_CHECK_PROTOCOL_TCP_OUT] != ~0) || (fib_index[IP_SOURCE_AND_PORT_RANGE_CHECK_PROTOCOL_UDP_OUT] != ~0)) { vnet_feature_enable_disable ("ip4-unicast", "ip4-source-and-port-range-check-rx", sw_if_index, is_add, &config, sizeof (config)); } /* For IN we are in the TX path */ if ((fib_index[IP_SOURCE_AND_PORT_RANGE_CHECK_PROTOCOL_TCP_IN] != ~0) || (fib_index[IP_SOURCE_AND_PORT_RANGE_CHECK_PROTOCOL_UDP_IN] != ~0)) { vnet_feature_enable_disable ("ip4-output", "ip4-source-and-port-range-check-tx", sw_if_index, is_add, &config, sizeof (config)); } return rv; } static clib_error_t * set_ip_source_and_port_range_check_fn (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; clib_error_t *error = 0; u8 is_add = 1; u32 sw_if_index = ~0; u32 vrf_id[IP_SOURCE_AND_PORT_RANGE_CHECK_N_PROTOCOLS]; u32 fib_index[IP_SOURCE_AND_PORT_RANGE_CHECK_N_PROTOCOLS]; int vrf_set = 0; uword *p; int rv = 0; int i; sw_if_index = ~0; for (i = 0; i < IP_SOURCE_AND_PORT_RANGE_CHECK_N_PROTOCOLS; i++) { fib_index[i] = ~0; vrf_id[i] = ~0; } while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT) { if (unformat (input, "%U", unformat_vnet_sw_interface, vnm, &sw_if_index)) ; else if (unformat (input, "tcp-out-vrf %d", &vrf_id[IP_SOURCE_AND_PORT_RANGE_CHECK_PROTOCOL_TCP_OUT])) vrf_set = 1; else if (unformat (input, "udp-out-vrf %d", &vrf_id[IP_SOURCE_AND_PORT_RANGE_CHECK_PROTOCOL_UDP_OUT])) vrf_set = 1; else if (unformat (input, "tcp-in-vrf %d", &vrf_id[IP_SOURCE_AND_PORT_RANGE_CHECK_PROTOCOL_TCP_IN])) vrf_set = 1; else if (unformat (input, "udp-in-vrf %d", &vrf_id[IP_SOURCE_AND_PORT_RANGE_CHECK_PROTOCOL_UDP_IN])) vrf_set = 1; else if (unformat (input, "del")) is_add = 0; else break; } if (sw_if_index == ~0) return clib_error_return (0, "Interface required but not specified"); if (!vrf_set) return clib_error_return (0, "TCP or UDP VRF ID required but not specified"); for (i = 0; i < IP_SOURCE_AND_PORT_RANGE_CHECK_N_PROTOCOLS; i++) { if (vrf_id[i] == 0) return clib_error_return (0, "TCP, UDP VRF ID should not be 0 (default). Should be distinct VRF for this purpose. "); if (vrf_id[i] != ~0) { p = hash_get (im->fib_index_by_table_id, vrf_id[i]); if (p == 0) return clib_error_return (0, "Invalid VRF ID %d", vrf_id[i]); fib_index[i] = p[0]; } } rv = set_ip_source_and_port_range_check (vm, fib_index, sw_if_index, is_add); switch (rv) { case 0: break; default: return clib_error_return (0, "set source and port-range on interface returned an unexpected value: %d", rv); } return error; } /*? * Add the 'ip4-source-and-port-range-check-rx' or * 'ip4-source-and-port-range-check-tx' graph node for a given * interface. 'tcp-out-vrf' and 'udp-out-vrf' will add to * the RX path. 'tcp-in-vrf' and 'udp-in-vrf' will add to * the TX path. A graph node will be inserted into the chain when * the range check is added to the first interface. It will not * be removed from when range check is removed from the last * interface. * * By adding the range check graph node to the interface, incoming * or outgoing TCP/UDP packets will be validated using the * provided IPv4 FIB table (VRF). * * @note 'ip4-source-and-port-range-check-rx' and * 'ip4-source-and-port-range-check-tx' strings are too long, so * they are truncated on the 'show vlib graph' output. * * @todo This content needs to be validated and potentially more detail added. * * @cliexpar * @parblock * Example of graph node before range checking is enabled: * @cliexstart{show vlib graph ip4-source-and-port-range-check-tx} * Name Next Previous * ip4-source-and-port-range- error-drop [0] * @cliexend * * Example of how to enable range checking on TX: * @cliexcmd{set interface ip source-and-port-range-check GigabitEthernet2/0/0 udp-in-vrf 7} * * Example of graph node after range checking is enabled: * @cliexstart{show vlib graph ip4-source-and-port-range-check-tx} * Name Next Previous * ip4-source-and-port-range- error-drop [0] ip4-rewrite * interface-output [1] * @cliexend * * Example of how to display the features enabed on an interface: * @cliexstart{show ip interface features GigabitEthernet2/0/0} * IP feature paths configured on GigabitEthernet2/0/0... * * ipv4 unicast: * ip4-source-and-port-range-check-rx * ip4-lookup * * ipv4 multicast: * ip4-lookup-multicast * * ipv4 multicast: * interface-output * * ipv6 unicast: * ip6-lookup * * ipv6 multicast: * ip6-lookup * * ipv6 multicast: * interface-output * @cliexend * @endparblock ?*/ /* *INDENT-OFF* */ VLIB_CLI_COMMAND (set_interface_ip_source_and_port_range_check_command, static) = { .path = "set interface ip source-and-port-range-check", .function = set_ip_source_and_port_range_check_fn, .short_help = "set interface ip source-and-port-range-check [tcp-out-vrf ] [udp-out-vrf ] [tcp-in-vrf ] [udp-in-vrf ] [del]", }; /* *INDENT-ON* */ static u8 * format_ppr_dpo (u8 * s, va_list * args) { index_t index = va_arg (*args, index_t); CLIB_UNUSED (u32 indent) = va_arg (*args, u32); protocol_port_range_dpo_t *ppr_dpo; int i, j; int printed = 0; ppr_dpo = protocol_port_range_dpo_get (index); s = format (s, "allow "); for (i = 0; i < ppr_dpo->n_used_blocks; i++) { for (j = 0; j < 8; j++) { if (ppr_dpo->blocks[i].low.as_u16[j]) { if (printed) s = format (s, ", "); if (ppr_dpo->blocks[i].hi.as_u16[j] > (ppr_dpo->blocks[i].low.as_u16[j] + 1)) s = format (s, "%d-%d", (u32) ppr_dpo->blocks[i].low.as_u16[j], (u32) ppr_dpo->blocks[i].hi.as_u16[j] - 1); else s = format (s, "%d", ppr_dpo->blocks[i].low.as_u16[j]); printed = 1; } } } return s; } static void ppr_dpo_lock (dpo_id_t * dpo) { } static void ppr_dpo_unlock (dpo_id_t * dpo) { } const static dpo_vft_t ppr_vft = { .dv_lock = ppr_dpo_lock, .dv_unlock = ppr_dpo_unlock, .dv_format = format_ppr_dpo, }; const static char *const ppr_ip4_nodes[] = { "ip4-source-and-port-range-check-rx", NULL, }; const static char *const *const ppr_nodes[DPO_PROTO_NUM] = { [DPO_PROTO_IP4] = ppr_ip4_nodes, }; clib_error_t * ip4_source_and_port_range_check_init (vlib_main_t * vm) { source_range_check_main_t *srm = &source_range_check_main; srm->vlib_main = vm; srm->vnet_main = vnet_get_main (); ppr_dpo_type = dpo_register_new_type (&ppr_vft, ppr_nodes); return 0; } VLIB_INIT_FUNCTION (ip4_source_and_port_range_check_init); protocol_port_range_dpo_t * protocol_port_range_dpo_alloc (void) { protocol_port_range_dpo_t *ppr_dpo; pool_get_aligned (ppr_dpo_pool, ppr_dpo, CLIB_CACHE_LINE_BYTES); memset (ppr_dpo, 0, sizeof (*ppr_dpo)); ppr_dpo->n_free_ranges = N_PORT_RANGES_PER_DPO; return (ppr_dpo); } static int add_port_range_adjacency (u32 fib_index, ip4_address_t * address, u32 length, u16 * low_ports, u16 * high_ports) { protocol_port_range_dpo_t *ppr_dpo; dpo_id_t dpop = DPO_INVALID; int i, j, k; fib_node_index_t fei; fib_prefix_t pfx = { .fp_proto = FIB_PROTOCOL_IP4, .fp_len = length, .fp_addr = { .ip4 = *address, }, }; /* * check to see if we have already sourced this prefix */ fei = fib_table_lookup_exact_match (fib_index, &pfx); if (FIB_NODE_INDEX_INVALID == fei) { /* * this is a first time add for this prefix. */ ppr_dpo = protocol_port_range_dpo_alloc (); } else { /* * the prefix is already there. * check it was sourced by us, and if so get the ragne DPO from it. */ dpo_id_t dpo = DPO_INVALID; const dpo_id_t *bucket; if (fib_entry_get_dpo_for_source (fei, FIB_SOURCE_SPECIAL, &dpo)) { /* * there is existing state. we'll want to add the new ranges to it */ bucket = load_balance_get_bucket_i (load_balance_get (dpo.dpoi_index), 0); ppr_dpo = protocol_port_range_dpo_get (bucket->dpoi_index); dpo_reset (&dpo); } else { /* * there is no PPR state associated with this prefix, * so we'll need a new DPO */ ppr_dpo = protocol_port_range_dpo_alloc (); } } if (vec_len (low_ports) > ppr_dpo->n_free_ranges) return VNET_API_ERROR_EXCEEDED_NUMBER_OF_RANGES_CAPACITY; j = k = 0; for (i = 0; i < vec_len (low_ports); i++) { for (; j < N_BLOCKS_PER_DPO; j++) { for (; k < 8; k++) { if (ppr_dpo->blocks[j].low.as_u16[k] == 0) { ppr_dpo->blocks[j].low.as_u16[k] = low_ports[i]; ppr_dpo->blocks[j].hi.as_u16[k] = high_ports[i]; goto doublebreak; } } } doublebreak:; } ppr_dpo->n_used_blocks = j + 1; /* * add or update the entry in the FIB */ dpo_set (&dpop, ppr_dpo_type, DPO_PROTO_IP4, (ppr_dpo - ppr_dpo_pool)); if (FIB_NODE_INDEX_INVALID == fei) { fib_table_entry_special_dpo_add (fib_index, &pfx, FIB_SOURCE_SPECIAL, FIB_ENTRY_FLAG_NONE, &dpop); } else { fib_entry_special_update (fei, FIB_SOURCE_SPECIAL, FIB_ENTRY_FLAG_NONE, &dpop); } return 0; } static int remove_port_range_adjacency (u32 fib_index, ip4_address_t * address, u32 length, u16 * low_ports, u16 * high_ports) { protocol_port_range_dpo_t *ppr_dpo; fib_node_index_t fei; int i, j, k; fib_prefix_t pfx = { .fp_proto = FIB_PROTOCOL_IP4, .fp_len = length, .fp_addr = { .ip4 = *address, }, }; /* * check to see if we have sourced this prefix */ fei = fib_table_lookup_exact_match (fib_index, &pfx); if (FIB_NODE_INDEX_INVALID == fei) { /* * not one of ours */ return VNET_API_ERROR_INCORRECT_ADJACENCY_TYPE; } else { /* * the prefix is already there. * check it was sourced by us */ dpo_id_t dpo = DPO_INVALID; const dpo_id_t *bucket; if (fib_entry_get_dpo_for_source (fei, FIB_SOURCE_SPECIAL, &dpo)) { /* * there is existing state. we'll want to add the new ranges to it */ bucket = load_balance_get_bucket_i (load_balance_get (dpo.dpoi_index), 0); ppr_dpo = protocol_port_range_dpo_get (bucket->dpoi_index); dpo_reset (&dpo); } else { /* * not one of ours */ return VNET_API_ERROR_INCORRECT_ADJACENCY_TYPE; } } for (i = 0; i < vec_len (low_ports); i++) { for (j = 0; j < N_BLOCKS_PER_DPO; j++) { for (k = 0; k < 8; k++) { if (low_ports[i] == ppr_dpo->blocks[j].low.as_u16[k] && high_ports[i] == ppr_dpo->blocks[j].hi.as_u16[k]) { ppr_dpo->blocks[j].low.as_u16[k] = ppr_dpo->blocks[j].hi.as_u16[k] = 0; goto doublebreak; } } } doublebreak:; } ppr_dpo->n_free_ranges = 0; /* Have we deleted all ranges yet? */ for (i = 0; i < N_BLOCKS_PER_DPO; i++) { for (j = 0; j < 8; j++) { if (ppr_dpo->blocks[j].low.as_u16[i] == 0) ppr_dpo->n_free_ranges++; } } if (N_PORT_RANGES_PER_DPO == ppr_dpo->n_free_ranges) { /* Yes, lose the adjacency... */ fib_table_entry_special_remove (fib_index, &pfx, FIB_SOURCE_SPECIAL); } else { /* * compact the ranges down to a contiguous block */ // FIXME. TODO. } return 0; } // This will be moved to another file and implemented post API freeze. int ip6_source_and_port_range_check_add_del (ip6_address_t * address, u32 length, u32 vrf_id, u16 * low_ports, u16 * high_ports, int is_add) { u32 fib_index; fib_index = fib_table_find (FIB_PROTOCOL_IP4, vrf_id); ASSERT (~0 != fib_index); fib_table_unlock (fib_index, FIB_PROTOCOL_IP4, FIB_SOURCE_CLASSIFY); return 0; } int ip4_source_and_port_range_check_add_del (ip4_address_t * address, u32 length, u32 vrf_id, u16 * low_ports, u16 * high_ports, int is_add) { u32 fib_index; fib_index = fib_table_find_or_create_and_lock (FIB_PROTOCOL_IP4, vrf_id, FIB_SOURCE_CLASSIFY); if (is_add == 0) { remove_port_range_adjacency (fib_index, address, length, low_ports, high_ports); } else { add_port_range_adjacency (fib_index, address, length, low_ports, high_ports); } return 0; } static clib_error_t * ip_source_and_port_range_check_command_fn (vlib_main_t * vm, unformat_input_t * input, vlib_cli_command_t * cmd) { u16 *low_ports = 0; u16 *high_ports = 0; u16 this_low; u16 this_hi; ip4_address_t ip4_addr; ip6_address_t ip6_addr; //This function will be moved to generic impl when v6 done. u32 length; u32 tmp, tmp2; u32 vrf_id = ~0; int is_add = 1, ip_ver = ~0; int rv; while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT) { if (unformat (input, "%U/%d", unformat_ip4_address, &ip4_addr, &length)) ip_ver = 4; else if (unformat (input, "%U/%d", unformat_ip6_address, &ip6_addr, &length)) ip_ver = 6; else if (unformat (input, "vrf %d", &vrf_id)) ; else if (unformat (input, "del")) is_add = 0; else if (unformat (input, "port %d", &tmp)) { if (tmp == 0 || tmp > 65535) return clib_error_return (0, "port %d out of range", tmp); this_low = tmp; this_hi = this_low + 1; vec_add1 (low_ports, this_low); vec_add1 (high_ports, this_hi); } else if (unformat (input, "range %d - %d", &tmp, &tmp2)) { if (tmp > tmp2) return clib_error_return (0, "ports %d and %d out of order", tmp, tmp2); if (tmp == 0 || tmp > 65535) return clib_error_return (0, "low port %d out of range", tmp); if (tmp2 == 0 || tmp2 > 65535) return clib_error_return (0, "high port %d out of range", tmp2); this_low = tmp; this_hi = tmp2 + 1; vec_add1 (low_ports, this_low); vec_add1 (high_ports, this_hi); } else break; } if (ip_ver == ~0) return clib_error_return (0, "
/ not specified"); if (vrf_id == ~0) return clib_error_return (0, " VRF ID required, not specified"); if (vec_len (low_ports) == 0) return clib_error_return (0, " Both VRF ID and range/port must be set for a protocol."); if (vrf_id == 0) return clib_error_return (0, " VRF ID can not be 0 (default)."); if (ip_ver == 4) rv = ip4_source_and_port_range_check_add_del (&ip4_addr, length, vrf_id, low_ports, high_ports, is_add); else return clib_error_return (0, " IPv6 in subsequent patch"); switch (rv) { case 0: break; case VNET_API_ERROR_INCORRECT_ADJACENCY_TYPE: return clib_error_return (0, " Incorrect adjacency for add/del operation"); case VNET_API_ERROR_EXCEEDED_NUMBER_OF_PORTS_CAPACITY: return clib_error_return (0, " Too many ports in add/del operation"); case VNET_API_ERROR_EXCEEDED_NUMBER_OF_RANGES_CAPACITY: return clib_error_return (0, " Too many ranges requested for add operation"); default: return clib_error_return (0, " returned an unexpected value: %d", rv); } return 0; } /*? * This command adds an IP Subnet and range of ports to be validated * by an IP FIB table (VRF). * * @todo This is incomplete. This needs a detailed description and a * practical example. * * @cliexpar * Example of how to add an IPv4 subnet and single port to an IPv4 FIB table: * @cliexcmd{set ip source-and-port-range-check vrf 7 172.16.1.0/24 port 23} * Example of how to add an IPv4 subnet and range of ports to an IPv4 FIB table: * @cliexcmd{set ip source-and-port-range-check vrf 7 172.16.1.0/24 range 23 - 100} * Example of how to delete an IPv4 subnet and single port from an IPv4 FIB table: * @cliexcmd{set ip source-and-port-range-check vrf 7 172.16.1.0/24 port 23 del} * Example of how to delete an IPv4 subnet and range of ports from an IPv4 FIB table: * @cliexcmd{set ip source-and-port-range-check vrf 7 172.16.1.0/24 range 23 - 100 del} ?*/ /* *INDENT-OFF* */ VLIB_CLI_COMMAND (ip_source_and_port_range_check_command, static) = { .path = "set ip source-and-port-range-check", .function = ip_source_and_port_range_check_command_fn, .short_help = "set ip source-and-port-range-check vrf / {port nn | range - } [del]", }; /* *INDENT-ON* */ static clib_error_t * show_source_and_port_range_check_fn (vlib_main_t * vm, unformat_input_t * input, vlib_cli_command_t * cmd) { protocol_port_range_dpo_t *ppr_dpo; u32 fib_index; u8 addr_set = 0; u32 vrf_id = ~0; int rv, i, j; u32 port = 0; fib_prefix_t pfx = { .fp_proto = FIB_PROTOCOL_IP4, .fp_len = 32, }; while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT) { if (unformat (input, "%U", unformat_ip4_address, &pfx.fp_addr.ip4)) addr_set = 1; else if (unformat (input, "vrf %d", &vrf_id)) ; else if (unformat (input, "port %d", &port)) ; else break; } if (addr_set == 0) return clib_error_return (0, "
not specified"); if (vrf_id == ~0) return clib_error_return (0, "VRF ID required, not specified"); fib_index = fib_table_find (FIB_PROTOCOL_IP4, vrf_id); if (~0 == fib_index) return clib_error_return (0, "VRF %d not found", vrf_id); /* * find the longest prefix match on the address requested, * check it was sourced by us */ dpo_id_t dpo = DPO_INVALID; const dpo_id_t *bucket; if (!fib_entry_get_dpo_for_source (fib_table_lookup (fib_index, &pfx), FIB_SOURCE_SPECIAL, &dpo)) { /* * not one of ours */ vlib_cli_output (vm, "%U: src address drop", format_ip4_address, &pfx.fp_addr.ip4); return 0; } bucket = load_balance_get_bucket_i (load_balance_get (dpo.dpoi_index), 0); ppr_dpo = protocol_port_range_dpo_get (bucket->dpoi_index); dpo_reset (&dpo); if (port) { rv = check_adj_port_range_x1 (ppr_dpo, (u16) port, 1234); if (rv == 1234) vlib_cli_output (vm, "%U port %d PASS", format_ip4_address, &pfx.fp_addr.ip4, port); else vlib_cli_output (vm, "%U port %d FAIL", format_ip4_address, &pfx.fp_addr.ip4, port); return 0; } else { u8 *s; s = format (0, "%U: ", format_ip4_address, &pfx.fp_addr.ip4); for (i = 0; i < N_BLOCKS_PER_DPO; i++) { for (j = 0; j < 8; j++) { if (ppr_dpo->blocks[i].low.as_u16[j]) s = format (s, "%d - %d ", (u32) ppr_dpo->blocks[i].low.as_u16[j], (u32) ppr_dpo->blocks[i].hi.as_u16[j]); } } vlib_cli_output (vm, "%s", s); vec_free (s); } return 0; } /*? * Display the range of ports being validated by an IPv4 FIB for a given * IP or subnet, or test if a given IP and port are being validated. * * @todo This is incomplete. This needs a detailed description and a * practical example. * * @cliexpar * Example of how to display the set of ports being validated for a given * IPv4 subnet: * @cliexstart{show ip source-and-port-range-check vrf 7 172.16.2.0} * 172.16.2.0: 23 - 101 * @cliexend * Example of how to test to determine of a given Pv4 address and port * are being validated: * @cliexstart{show ip source-and-port-range-check vrf 7 172.16.2.2 port 23} * 172.16.2.2 port 23 PASS * @cliexend * @cliexstart{show ip source-and-port-range-check vrf 7 172.16.2.2 port 250} * 172.16.2.2 port 250 FAIL * @cliexend ?*/ /* *INDENT-OFF* */ VLIB_CLI_COMMAND (show_source_and_port_range_check, static) = { .path = "show ip source-and-port-range-check", .function = show_source_and_port_range_check_fn, .short_help = "show ip source-and-port-range-check vrf [port ]", }; /* *INDENT-ON* */ /* * fd.io coding-style-patch-verification: ON * * Local Variables: * eval: (c-set-style "gnu") * End: */