/* * 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. */ /* * ip/ip6_forward.c: IP v6 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/ip6_neighbor.h> #include <vnet/ethernet/ethernet.h> /* for ethernet_header_t */ #include <vnet/srp/srp.h> /* for srp_hw_interface_class */ #include <vppinfra/cache.h> #include <vnet/fib/fib_urpf_list.h> /* for FIB uRPF check */ #include <vnet/fib/ip6_fib.h> #include <vnet/mfib/ip6_mfib.h> #include <vnet/dpo/load_balance_map.h> #include <vnet/dpo/classify_dpo.h> #include <vppinfra/bihash_template.c> /* Flag used by IOAM code. Classifier sets it pop-hop-by-hop checks it */ #define OI_DECAP 0x80000000 /** * @file * @brief IPv6 Forwarding. * * This file contains the source code for IPv6 forwarding. */ always_inline uword ip6_lookup_inline (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame) { ip6_main_t *im = &ip6_main; vlib_combined_counter_main_t *cm = &load_balance_main.lbm_to_counters; u32 n_left_from, n_left_to_next, *from, *to_next; ip_lookup_next_t next; u32 thread_index = vlib_get_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) { vlib_buffer_t *p0, *p1; u32 pi0, pi1, lbi0, lbi1, wrong_next; ip_lookup_next_t next0, next1; ip6_header_t *ip0, *ip1; ip6_address_t *dst_addr0, *dst_addr1; u32 fib_index0, fib_index1; u32 flow_hash_config0, flow_hash_config1; const dpo_id_t *dpo0, *dpo1; const load_balance_t *lb0, *lb1; /* 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 (ip0[0]), LOAD); } pi0 = to_next[0] = from[0]; pi1 = to_next[1] = from[1]; p0 = vlib_get_buffer (vm, pi0); p1 = vlib_get_buffer (vm, pi1); ip0 = vlib_buffer_get_current (p0); ip1 = vlib_buffer_get_current (p1); dst_addr0 = &ip0->dst_address; dst_addr1 = &ip1->dst_address; fib_index0 = vec_elt (im->fib_index_by_sw_if_index, vnet_buffer (p0)->sw_if_index[VLIB_RX]); fib_index1 = vec_elt (im->fib_index_by_sw_if_index, vnet_buffer (p1)->sw_if_index[VLIB_RX]); fib_index0 = (vnet_buffer (p0)->sw_if_index[VLIB_TX] == (u32) ~ 0) ? fib_index0 : vnet_buffer (p0)->sw_if_index[VLIB_TX]; fib_index1 = (vnet_buffer (p1)->sw_if_index[VLIB_TX] == (u32) ~ 0) ? fib_index1 : vnet_buffer (p1)->sw_if_index[VLIB_TX]; lbi0 = ip6_fib_table_fwding_lookup (im, fib_index0, dst_addr0); lbi1 = ip6_fib_table_fwding_lookup (im, fib_index1, dst_addr1); lb0 = load_balance_get (lbi0); lb1 = load_balance_get (lbi1); ASSERT (lb0->lb_n_buckets > 0); ASSERT (lb1->lb_n_buckets > 0); ASSERT (is_pow2 (lb0->lb_n_buckets)); ASSERT (is_pow2 (lb1->lb_n_buckets)); vnet_buffer (p0)->ip.flow_hash = vnet_buffer (p1)->ip.flow_hash = 0; if (PREDICT_FALSE (lb0->lb_n_buckets > 1)) { flow_hash_config0 = lb0->lb_hash_config; vnet_buffer (p0)->ip.flow_hash = ip6_compute_flow_hash (ip0, flow_hash_config0); dpo0 = load_balance_get_fwd_bucket (lb0, (vnet_buffer (p0)->ip.flow_hash & (lb0->lb_n_buckets_minus_1))); } else { dpo0 = load_balance_get_bucket_i (lb0, 0); } if (PREDICT_FALSE (lb1->lb_n_buckets > 1)) { flow_hash_config1 = lb1->lb_hash_config; vnet_buffer (p1)->ip.flow_hash = ip6_compute_flow_hash (ip1, flow_hash_config1); dpo1 = load_balance_get_fwd_bucket (lb1, (vnet_buffer (p1)->ip.flow_hash & (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; /* Only process the HBH Option Header if explicitly configured to do so */ if (PREDICT_FALSE (ip0->protocol == IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS)) { next0 = (dpo_is_adj (dpo0) && im->hbh_enabled) ? (ip_lookup_next_t) IP6_LOOKUP_NEXT_HOP_BY_HOP : next0; } if (PREDICT_FALSE (ip1->protocol == IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS)) { next1 = (dpo_is_adj (dpo1) && im->hbh_enabled) ? (ip_lookup_next_t) IP6_LOOKUP_NEXT_HOP_BY_HOP : next1; } 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)); from += 2; to_next += 2; n_left_to_next -= 2; n_left_from -= 2; wrong_next = (next0 != next) + 2 * (next1 != next); if (PREDICT_FALSE (wrong_next != 0)) { switch (wrong_next) { case 1: /* A B A */ to_next[-2] = pi1; to_next -= 1; n_left_to_next += 1; vlib_set_next_frame_buffer (vm, node, next0, pi0); break; case 2: /* A A B */ to_next -= 1; n_left_to_next += 1; vlib_set_next_frame_buffer (vm, node, next1, pi1); break; case 3: /* A B C */ to_next -= 2; n_left_to_next += 2; vlib_set_next_frame_buffer (vm, node, next0, pi0); vlib_set_next_frame_buffer (vm, node, next1, pi1); if (next0 == next1) { /* A B B */ vlib_put_next_frame (vm, node, next, n_left_to_next); next = next1; vlib_get_next_frame (vm, node, next, to_next, n_left_to_next); } } } } while (n_left_from > 0 && n_left_to_next > 0) { vlib_buffer_t *p0; ip6_header_t *ip0; u32 pi0, lbi0; ip_lookup_next_t next0; load_balance_t *lb0; ip6_address_t *dst_addr0; u32 fib_index0, flow_hash_config0; const dpo_id_t *dpo0; pi0 = from[0]; to_next[0] = pi0; p0 = vlib_get_buffer (vm, pi0); ip0 = vlib_buffer_get_current (p0); dst_addr0 = &ip0->dst_address; fib_index0 = vec_elt (im->fib_index_by_sw_if_index, vnet_buffer (p0)->sw_if_index[VLIB_RX]); fib_index0 = (vnet_buffer (p0)->sw_if_index[VLIB_TX] == (u32) ~ 0) ? fib_index0 : vnet_buffer (p0)->sw_if_index[VLIB_TX]; lbi0 = ip6_fib_table_fwding_lookup (im, fib_index0, dst_addr0); lb0 = load_balance_get (lbi0); flow_hash_config0 = lb0->lb_hash_config; vnet_buffer (p0)->ip.flow_hash = 0; ASSERT (lb0->lb_n_buckets > 0); ASSERT (is_pow2 (lb0->lb_n_buckets)); if (PREDICT_FALSE (lb0->lb_n_buckets > 1)) { flow_hash_config0 = lb0->lb_hash_config; vnet_buffer (p0)->ip.flow_hash = ip6_compute_flow_hash (ip0, flow_hash_config0); dpo0 = load_balance_get_fwd_bucket (lb0, (vnet_buffer (p0)->ip.flow_hash & (lb0->lb_n_buckets_minus_1))); } else { dpo0 = load_balance_get_bucket_i (lb0, 0); } dpo0 = load_balance_get_bucket_i (lb0, (vnet_buffer (p0)->ip.flow_hash & lb0->lb_n_buckets_minus_1)); next0 = dpo0->dpoi_next_node; /* Only process the HBH Option Header if explicitly configured to do so */ if (PREDICT_FALSE (ip0->protocol == IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS)) { next0 = (dpo_is_adj (dpo0) && im->hbh_enabled) ? (ip_lookup_next_t) IP6_LOOKUP_NEXT_HOP_BY_HOP : next0; } 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)); from += 1; to_next += 1; n_left_to_next -= 1; n_left_from -= 1; if (PREDICT_FALSE (next0 != next)) { n_left_to_next += 1; vlib_put_next_frame (vm, node, next, n_left_to_next); next = next0; vlib_get_next_frame (vm, node, next, to_next, n_left_to_next); to_next[0] = pi0; to_next += 1; n_left_to_next -= 1; } } vlib_put_next_frame (vm, node, next, n_left_to_next); } if (node->flags & VLIB_NODE_FLAG_TRACE) ip6_forward_next_trace (vm, node, frame, VLIB_TX); return frame->n_vectors; } static void ip6_add_interface_routes (vnet_main_t * vnm, u32 sw_if_index, ip6_main_t * im, u32 fib_index, ip_interface_address_t * a) { ip_lookup_main_t *lm = &im->lookup_main; ip6_address_t *address = ip_interface_address_get_address (lm, a); fib_prefix_t pfx = { .fp_len = a->address_length, .fp_proto = FIB_PROTOCOL_IP6, .fp_addr.ip6 = *address, }; if (a->address_length < 128) { fib_table_entry_update_one_path (fib_index, &pfx, FIB_SOURCE_INTERFACE, (FIB_ENTRY_FLAG_CONNECTED | FIB_ENTRY_FLAG_ATTACHED), DPO_PROTO_IP6, /* No next-hop address */ NULL, sw_if_index, /* invalid FIB index */ ~0, 1, /* no label stack */ NULL, FIB_ROUTE_PATH_FLAG_NONE); } pfx.fp_len = 128; 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_IP6, classify_dpo_create (DPO_PROTO_IP6, 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_IP6, &pfx.fp_addr, sw_if_index, ~0, 1, NULL, FIB_ROUTE_PATH_FLAG_NONE); } static void ip6_del_interface_routes (ip6_main_t * im, u32 fib_index, ip6_address_t * address, u32 address_length) { fib_prefix_t pfx = { .fp_len = address_length, .fp_proto = FIB_PROTOCOL_IP6, .fp_addr.ip6 = *address, }; if (pfx.fp_len < 128) { fib_table_entry_delete (fib_index, &pfx, FIB_SOURCE_INTERFACE); } pfx.fp_len = 128; fib_table_entry_delete (fib_index, &pfx, FIB_SOURCE_INTERFACE); } void ip6_sw_interface_enable_disable (u32 sw_if_index, u32 is_enable) { ip6_main_t *im = &ip6_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 { /* The ref count is 0 when an address is removed from an interface that has * no address - this is not a ciritical error */ if (0 == im->ip_enabled_by_sw_if_index[sw_if_index] || 0 != --im->ip_enabled_by_sw_if_index[sw_if_index]) return; } vnet_feature_enable_disable ("ip6-unicast", "ip6-drop", sw_if_index, !is_enable, 0, 0); vnet_feature_enable_disable ("ip6-multicast", "ip6-drop", sw_if_index, !is_enable, 0, 0); } /* get first interface address */ ip6_address_t * ip6_interface_first_address (ip6_main_t * im, u32 sw_if_index) { ip_lookup_main_t *lm = &im->lookup_main; ip_interface_address_t *ia = 0; ip6_address_t *result = 0; /* *INDENT-OFF* */ foreach_ip_interface_address (lm, ia, sw_if_index, 1 /* honor unnumbered */, ({ ip6_address_t * a = ip_interface_address_get_address (lm, ia); result = a; break; })); /* *INDENT-ON* */ return result; } clib_error_t * ip6_add_del_interface_address (vlib_main_t * vm, u32 sw_if_index, ip6_address_t * address, u32 address_length, u32 is_del) { vnet_main_t *vnm = vnet_get_main (); ip6_main_t *im = &ip6_main; ip_lookup_main_t *lm = &im->lookup_main; clib_error_t *error; u32 if_address_index; ip6_address_fib_t ip6_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); vec_validate (im->mfib_index_by_sw_if_index, sw_if_index); ip6_addr_fib_init (&ip6_af, address, vec_elt (im->fib_index_by_sw_if_index, sw_if_index)); vec_add1 (addr_fib, ip6_af); { uword 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; /* Pool did not grow: add duplicate address. */ if (elts_before == pool_elts (lm->if_address_pool)) goto done; } ip6_sw_interface_enable_disable (sw_if_index, !is_del); if (is_del) ip6_del_interface_routes (im, ip6_af.fib_index, address, address_length); else ip6_add_interface_routes (vnm, sw_if_index, im, ip6_af.fib_index, pool_elt_at_index (lm->if_address_pool, if_address_index)); { ip6_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 * ip6_sw_interface_admin_up_down (vnet_main_t * vnm, u32 sw_if_index, u32 flags) { ip6_main_t *im = &ip6_main; ip_interface_address_t *ia; ip6_address_t *a; u32 is_admin_up, fib_index; /* Fill in lookup tables with default table (0). */ vec_validate (im->fib_index_by_sw_if_index, sw_if_index); vec_validate_init_empty (im-> lookup_main.if_address_pool_index_by_sw_if_index, sw_if_index, ~0); is_admin_up = (flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP) != 0; fib_index = vec_elt (im->fib_index_by_sw_if_index, sw_if_index); /* *INDENT-OFF* */ foreach_ip_interface_address (&im->lookup_main, ia, sw_if_index, 0 /* honor unnumbered */, ({ a = ip_interface_address_get_address (&im->lookup_main, ia); if (is_admin_up) ip6_add_interface_routes (vnm, sw_if_index, im, fib_index, ia); else ip6_del_interface_routes (im, fib_index, a, ia->address_length); })); /* *INDENT-ON* */ return 0; } VNET_SW_INTERFACE_ADMIN_UP_DOWN_FUNCTION (ip6_sw_interface_admin_up_down); /* Built-in ip6 unicast rx feature path definition */ /* *INDENT-OFF* */ VNET_FEATURE_ARC_INIT (ip6_unicast, static) = { .arc_name = "ip6-unicast", .start_nodes = VNET_FEATURES ("ip6-input"), .arc_index_ptr = &ip6_main.lookup_main.ucast_feature_arc_index, }; VNET_FEATURE_INIT (ip6_flow_classify, static) = { .arc_name = "ip6-unicast", .node_name = "ip6-flow-classify", .runs_before = VNET_FEATURES ("ip6-inacl"), }; VNET_FEATURE_INIT (ip6_inacl, static) = { .arc_name = "ip6-unicast", .node_name = "ip6-inacl", .runs_before = VNET_FEATURES ("ip6-policer-classify"), }; VNET_FEATURE_INIT (ip6_policer_classify, static) = { .arc_name = "ip6-unicast", .node_name = "ip6-policer-classify", .runs_before = VNET_FEATURES ("ipsec-input-ip6"), }; VNET_FEATURE_INIT (ip6_ipsec, static) = { .arc_name = "ip6-unicast", .node_name = "ipsec-input-ip6", .runs_before = VNET_FEATURES ("l2tp-decap"), }; VNET_FEATURE_INIT (ip6_l2tp, static) = { .arc_name = "ip6-unicast", .node_name = "l2tp-decap", .runs_before = VNET_FEATURES ("vpath-input-ip6"), }; VNET_FEATURE_INIT (ip6_vpath, static) = { .arc_name = "ip6-unicast", .node_name = "vpath-input-ip6", .runs_before = VNET_FEATURES ("ip6-vxlan-bypass"), }; VNET_FEATURE_INIT (ip6_vxlan_bypass, static) = { .arc_name = "ip6-unicast", .node_name = "ip6-vxlan-bypass", .runs_before = VNET_FEATURES ("ip6-lookup"), }; VNET_FEATURE_INIT (ip6_drop, static) = { .arc_name = "ip6-unicast", .node_name = "ip6-drop", .runs_before = VNET_FEATURES ("ip6-lookup"), }; VNET_FEATURE_INIT (ip6_lookup, static) = { .arc_name = "ip6-unicast", .node_name = "ip6-lookup", .runs_before = 0, /*last feature*/ }; /* Built-in ip6 multicast rx feature path definition (none now) */ VNET_FEATURE_ARC_INIT (ip6_multicast, static) = { .arc_name = "ip6-multicast", .start_nodes = VNET_FEATURES ("ip6-input"), .arc_index_ptr = &ip6_main.lookup_main.mcast_feature_arc_index, }; VNET_FEATURE_INIT (ip6_vpath_mc, static) = { .arc_name = "ip6-multicast", .node_name = "vpath-input-ip6", .runs_before = VNET_FEATURES ("ip6-mfib-forward-lookup"), }; VNET_FEATURE_INIT (ip6_drop_mc, static) = { .arc_name = "ip6-multicast", .node_name = "ip6-drop", .runs_before = VNET_FEATURES ("ip6-mfib-forward-lookup"), }; VNET_FEATURE_INIT (ip6_mc_lookup, static) = { .arc_name = "ip6-multicast", .node_name = "ip6-mfib-forward-lookup", .runs_before = 0, /* last feature */ }; /* Built-in ip4 tx feature path definition */ VNET_FEATURE_ARC_INIT (ip6_output, static) = { .arc_name = "ip6-output", .start_nodes = VNET_FEATURES ("ip6-rewrite", "ip6-midchain"), .arc_index_ptr = &ip6_main.lookup_main.output_feature_arc_index, }; VNET_FEATURE_INIT (ip6_ipsec_output, static) = { .arc_name = "ip6-output", .node_name = "ipsec-output-ip6", .runs_before = VNET_FEATURES ("interface-output"), }; VNET_FEATURE_INIT (ip6_interface_output, static) = { .arc_name = "ip6-output", .node_name = "interface-output", .runs_before = 0, /* not before any other features */ }; /* *INDENT-ON* */ clib_error_t * ip6_sw_interface_add_del (vnet_main_t * vnm, u32 sw_if_index, u32 is_add) { ip6_main_t *im = &ip6_main; 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) { /* Ensure that IPv6 is disabled */ ip6_main_t *im6 = &ip6_main; ip_lookup_main_t *lm6 = &im6->lookup_main; ip_interface_address_t *ia = 0; ip6_address_t *address; vlib_main_t *vm = vlib_get_main (); ip6_neighbor_sw_interface_add_del (vnm, sw_if_index, 0 /* is_add */ ); /* *INDENT-OFF* */ foreach_ip_interface_address (lm6, ia, sw_if_index, 1 /* honor unnumbered */, ({ address = ip_interface_address_get_address (lm6, ia); ip6_add_del_interface_address(vm, sw_if_index, address, ia->address_length, 1); })); /* *INDENT-ON* */ ip6_mfib_interface_enable_disable (sw_if_index, 0); } vnet_feature_enable_disable ("ip6-unicast", "ip6-drop", sw_if_index, is_add, 0, 0); vnet_feature_enable_disable ("ip6-multicast", "ip6-drop", sw_if_index, is_add, 0, 0); return /* no error */ 0; } VNET_SW_INTERFACE_ADD_DEL_FUNCTION (ip6_sw_interface_add_del); static uword ip6_lookup (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame) { return ip6_lookup_inline (vm, node, frame); } static u8 *format_ip6_lookup_trace (u8 * s, va_list * args); /* *INDENT-OFF* */ VLIB_REGISTER_NODE (ip6_lookup_node) = { .function = ip6_lookup, .name = "ip6-lookup", .vector_size = sizeof (u32), .format_trace = format_ip6_lookup_trace, .n_next_nodes = IP6_LOOKUP_N_NEXT, .next_nodes = IP6_LOOKUP_NEXT_NODES, }; /* *INDENT-ON* */ VLIB_NODE_FUNCTION_MULTIARCH (ip6_lookup_node, ip6_lookup); always_inline uword ip6_load_balance (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 = vlib_get_thread_index (); ip6_main_t *im = &ip6_main; from = vlib_frame_vector_args (frame); n_left_from = frame->n_vectors; next = node->cached_next_index; if (node->flags & VLIB_NODE_FLAG_TRACE) ip6_forward_next_trace (vm, node, frame, VLIB_TX); 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 ip6_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 = ip6_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 = ip6_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; /* Only process the HBH Option Header if explicitly configured to do so */ if (PREDICT_FALSE (ip0->protocol == IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS)) { next0 = (dpo_is_adj (dpo0) && im->hbh_enabled) ? (ip_lookup_next_t) IP6_LOOKUP_NEXT_HOP_BY_HOP : next0; } /* Only process the HBH Option Header if explicitly configured to do so */ if (PREDICT_FALSE (ip1->protocol == IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS)) { next1 = (dpo_is_adj (dpo1) && im->hbh_enabled) ? (ip_lookup_next_t) IP6_LOOKUP_NEXT_HOP_BY_HOP : next1; } 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 ip6_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 = ip6_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; /* Only process the HBH Option Header if explicitly configured to do so */ if (PREDICT_FALSE (ip0->protocol == IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS)) { next0 = (dpo_is_adj (dpo0) && im->hbh_enabled) ? (ip_lookup_next_t) IP6_LOOKUP_NEXT_HOP_BY_HOP : next0; } 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); } return frame->n_vectors; } /* *INDENT-OFF* */ VLIB_REGISTER_NODE (ip6_load_balance_node) = { .function = ip6_load_balance, .name = "ip6-load-balance", .vector_size = sizeof (u32), .sibling_of = "ip6-lookup", .format_trace = format_ip6_lookup_trace, }; /* *INDENT-ON* */ VLIB_NODE_FUNCTION_MULTIARCH (ip6_load_balance_node, ip6_load_balance); typedef struct { /* Adjacency taken. */ u32 adj_index; u32 flow_hash; u32 fib_index; /* Packet data, possibly *after* rewrite. */ u8 packet_data[128 - 1 * sizeof (u32)]; } ip6_forward_next_trace_t; u8 * format_ip6_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 *); ip6_forward_next_trace_t *t = va_arg (*args, ip6_forward_next_trace_t *); u32 indent = format_get_indent (s); s = format (s, "%U%U", format_white_space, indent, format_ip6_header, t->packet_data, sizeof (t->packet_data)); return s; } static u8 * format_ip6_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 *); ip6_forward_next_trace_t *t = va_arg (*args, ip6_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->adj_index, t->flow_hash); s = format (s, "\n%U%U", format_white_space, indent, format_ip6_header, t->packet_data, sizeof (t->packet_data)); return s; } static u8 * format_ip6_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 *); ip6_forward_next_trace_t *t = va_arg (*args, ip6_forward_next_trace_t *); u32 indent = format_get_indent (s); s = format (s, "tx_sw_if_index %d adj-idx %d : %U flow hash: 0x%08x", t->fib_index, t->adj_index, format_ip_adjacency, t->adj_index, FORMAT_IP_ADJACENCY_NONE, t->flow_hash); s = format (s, "\n%U%U", format_white_space, indent, format_ip_adjacency_packet_data, t->adj_index, t->packet_data, sizeof (t->packet_data)); return s; } /* Common trace function for all ip6-forward next nodes. */ void ip6_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; ip6_main_t *im = &ip6_main; n_left = frame->n_vectors; from = vlib_frame_vector_args (frame); while (n_left >= 4) { u32 bi0, bi1; vlib_buffer_t *b0, *b1; ip6_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->adj_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 (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->adj_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 (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; ip6_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->adj_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 (t0->packet_data, vlib_buffer_get_current (b0), sizeof (t0->packet_data)); } from += 1; n_left -= 1; } } /* Compute TCP/UDP/ICMP6 checksum in software. */ u16 ip6_tcp_udp_icmp_compute_checksum (vlib_main_t * vm, vlib_buffer_t * p0, ip6_header_t * ip0, int *bogus_lengthp) { ip_csum_t sum0; u16 sum16, payload_length_host_byte_order; u32 i, n_this_buffer, n_bytes_left; u32 headers_size = sizeof (ip0[0]); void *data_this_buffer; ASSERT (bogus_lengthp); *bogus_lengthp = 0; /* Initialize checksum with ip header. */ sum0 = ip0->payload_length + clib_host_to_net_u16 (ip0->protocol); payload_length_host_byte_order = clib_net_to_host_u16 (ip0->payload_length); data_this_buffer = (void *) (ip0 + 1); for (i = 0; i < ARRAY_LEN (ip0->src_address.as_uword); i++) { sum0 = ip_csum_with_carry (sum0, clib_mem_unaligned (&ip0-> src_address.as_uword[i], uword)); sum0 = ip_csum_with_carry (sum0, clib_mem_unaligned (&ip0->dst_address.as_uword[i], uword)); } /* some icmp packets may come with a "router alert" hop-by-hop extension header (e.g., mldv2 packets) * or UDP-Ping packets */ if (PREDICT_FALSE (ip0->protocol == IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS)) { u32 skip_bytes; ip6_hop_by_hop_ext_t *ext_hdr = (ip6_hop_by_hop_ext_t *) data_this_buffer; /* validate really icmp6 next */ ASSERT ((ext_hdr->next_hdr == IP_PROTOCOL_ICMP6) || (ext_hdr->next_hdr == IP_PROTOCOL_UDP)); skip_bytes = 8 * (1 + ext_hdr->n_data_u64s); data_this_buffer = (void *) ((u8 *) data_this_buffer + skip_bytes); payload_length_host_byte_order -= skip_bytes; headers_size += skip_bytes; } n_bytes_left = n_this_buffer = payload_length_host_byte_order; if (p0 && n_this_buffer + headers_size > p0->current_length) n_this_buffer = p0->current_length > headers_size ? p0->current_length - headers_size : 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; if (!(p0->flags & VLIB_BUFFER_NEXT_PRESENT)) { *bogus_lengthp = 1; return 0xfefe; } 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 ip6_tcp_udp_icmp_validate_checksum (vlib_main_t * vm, vlib_buffer_t * p0) { ip6_header_t *ip0 = vlib_buffer_get_current (p0); udp_header_t *udp0; u16 sum16; int bogus_length; /* some icmp packets may come with a "router alert" hop-by-hop extension header (e.g., mldv2 packets) */ ASSERT (ip0->protocol == IP_PROTOCOL_TCP || ip0->protocol == IP_PROTOCOL_ICMP6 || ip0->protocol == IP_PROTOCOL_UDP || ip0->protocol == IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS); 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 = ip6_tcp_udp_icmp_compute_checksum (vm, p0, ip0, &bogus_length); p0->flags |= (VNET_BUFFER_F_L4_CHECKSUM_COMPUTED | ((sum16 == 0) << VNET_BUFFER_F_LOG2_L4_CHECKSUM_CORRECT)); return p0->flags; } /** * @brief returns number of links on which src is reachable. */ always_inline int ip6_urpf_loose_check (ip6_main_t * im, vlib_buffer_t * b, ip6_header_t * i) { const load_balance_t *lb0; index_t lbi; lbi = ip6_fib_table_fwding_lookup_with_if_index (im, vnet_buffer (b)->sw_if_index[VLIB_RX], &i->src_address); lb0 = load_balance_get (lbi); return (fib_urpf_check_size (lb0->lb_urpf)); } always_inline u8 ip6_next_proto_is_tcp_udp (vlib_buffer_t * p0, ip6_header_t * ip0, u32 * udp_offset0) { u32 proto0; proto0 = ip6_locate_header (p0, ip0, IP_PROTOCOL_UDP, udp_offset0); if (proto0 != IP_PROTOCOL_UDP) { proto0 = ip6_locate_header (p0, ip0, IP_PROTOCOL_TCP, udp_offset0); proto0 = (proto0 == IP_PROTOCOL_TCP) ? proto0 : 0; } return proto0; } /* *INDENT-OFF* */ VNET_FEATURE_ARC_INIT (ip6_local) = { .arc_name = "ip6-local", .start_nodes = VNET_FEATURES ("ip6-local"), }; /* *INDENT-ON* */ static uword ip6_local_inline (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame, int head_of_feature_arc) { ip6_main_t *im = &ip6_main; ip_lookup_main_t *lm = &im->lookup_main; ip_local_next_t next_index; u32 *from, *to_next, n_left_from, n_left_to_next; vlib_node_runtime_t *error_node = vlib_node_get_runtime (vm, ip6_input_node.index); u8 arc_index = vnet_feat_arc_ip6_local.feature_arc_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) ip6_forward_next_trace (vm, node, frame, VLIB_TX); while (n_left_from > 0) { 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; ip6_header_t *ip0, *ip1; udp_header_t *udp0, *udp1; u32 pi0, ip_len0, udp_len0, flags0, next0; u32 pi1, ip_len1, udp_len1, flags1, next1; i32 len_diff0, len_diff1; u8 error0, type0, good_l4_csum0, is_tcp_udp0; u8 error1, type1, good_l4_csum1, is_tcp_udp1; u32 udp_offset0, udp_offset1; 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; error0 = error1 = IP6_ERROR_UNKNOWN_PROTOCOL; p0 = vlib_get_buffer (vm, pi0); p1 = vlib_get_buffer (vm, pi1); ip0 = vlib_buffer_get_current (p0); ip1 = vlib_buffer_get_current (p1); if (head_of_feature_arc == 0) goto skip_checks; vnet_buffer (p0)->l3_hdr_offset = p0->current_data; vnet_buffer (p1)->l3_hdr_offset = p1->current_data; type0 = lm->builtin_protocol_by_ip_protocol[ip0->protocol]; type1 = lm->builtin_protocol_by_ip_protocol[ip1->protocol]; flags0 = p0->flags; flags1 = p1->flags; is_tcp_udp0 = ip6_next_proto_is_tcp_udp (p0, ip0, &udp_offset0); is_tcp_udp1 = ip6_next_proto_is_tcp_udp (p1, ip1, &udp_offset1); good_l4_csum0 = (flags0 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT && !(flags0 & VNET_BUFFER_F_OFFLOAD_TCP_CKSUM || flags0 & VNET_BUFFER_F_OFFLOAD_UDP_CKSUM)) != 0; good_l4_csum1 = (flags1 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT && !(flags1 & VNET_BUFFER_F_OFFLOAD_TCP_CKSUM || flags1 & VNET_BUFFER_F_OFFLOAD_UDP_CKSUM)) != 0; len_diff0 = 0; len_diff1 = 0; if (PREDICT_TRUE (is_tcp_udp0)) { udp0 = (udp_header_t *) ((u8 *) ip0 + udp_offset0); /* Don't verify UDP checksum for packets with explicit zero checksum. */ good_l4_csum0 |= type0 == IP_BUILTIN_PROTOCOL_UDP && udp0->checksum == 0; /* Verify UDP length. */ if (is_tcp_udp0 == IP_PROTOCOL_UDP) { ip_len0 = clib_net_to_host_u16 (ip0->payload_length); udp_len0 = clib_net_to_host_u16 (udp0->length); len_diff0 = ip_len0 - udp_len0; } } if (PREDICT_TRUE (is_tcp_udp1)) { udp1 = (udp_header_t *) ((u8 *) ip1 + udp_offset1); /* Don't verify UDP checksum for packets with explicit zero checksum. */ good_l4_csum1 |= type1 == IP_BUILTIN_PROTOCOL_UDP && udp1->checksum == 0; /* Verify UDP length. */ if (is_tcp_udp1 == IP_PROTOCOL_UDP) { ip_len1 = clib_net_to_host_u16 (ip1->payload_length); udp_len1 = clib_net_to_host_u16 (udp1->length); len_diff1 = ip_len1 - udp_len1; } } good_l4_csum0 |= type0 == IP_BUILTIN_PROTOCOL_UNKNOWN; good_l4_csum1 |= type1 == IP_BUILTIN_PROTOCOL_UNKNOWN; len_diff0 = type0 == IP_BUILTIN_PROTOCOL_UDP ? len_diff0 : 0; len_diff1 = type1 == IP_BUILTIN_PROTOCOL_UDP ? len_diff1 : 0; if (PREDICT_FALSE (type0 != IP_BUILTIN_PROTOCOL_UNKNOWN && !good_l4_csum0 && !(flags0 & VNET_BUFFER_F_L4_CHECKSUM_COMPUTED))) { flags0 = ip6_tcp_udp_icmp_validate_checksum (vm, p0); good_l4_csum0 = (flags0 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0; } if (PREDICT_FALSE (type1 != IP_BUILTIN_PROTOCOL_UNKNOWN && !good_l4_csum1 && !(flags1 & VNET_BUFFER_F_L4_CHECKSUM_COMPUTED))) { flags1 = ip6_tcp_udp_icmp_validate_checksum (vm, p1); good_l4_csum1 = (flags1 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0; } error0 = error1 = IP6_ERROR_UNKNOWN_PROTOCOL; error0 = len_diff0 < 0 ? IP6_ERROR_UDP_LENGTH : error0; error1 = len_diff1 < 0 ? IP6_ERROR_UDP_LENGTH : error1; ASSERT (IP6_ERROR_UDP_CHECKSUM + IP_BUILTIN_PROTOCOL_UDP == IP6_ERROR_UDP_CHECKSUM); ASSERT (IP6_ERROR_UDP_CHECKSUM + IP_BUILTIN_PROTOCOL_ICMP == IP6_ERROR_ICMP_CHECKSUM); error0 = (!good_l4_csum0 ? IP6_ERROR_UDP_CHECKSUM + type0 : error0); error1 = (!good_l4_csum1 ? IP6_ERROR_UDP_CHECKSUM + type1 : error1); /* Drop packets from unroutable hosts. */ /* If this is a neighbor solicitation (ICMP), skip source RPF check */ if (error0 == IP6_ERROR_UNKNOWN_PROTOCOL && type0 != IP_BUILTIN_PROTOCOL_ICMP && !ip6_address_is_link_local_unicast (&ip0->src_address)) { error0 = (!ip6_urpf_loose_check (im, p0, ip0) ? IP6_ERROR_SRC_LOOKUP_MISS : error0); } if (error1 == IP6_ERROR_UNKNOWN_PROTOCOL && type1 != IP_BUILTIN_PROTOCOL_ICMP && !ip6_address_is_link_local_unicast (&ip1->src_address)) { error1 = (!ip6_urpf_loose_check (im, p1, ip1) ? IP6_ERROR_SRC_LOOKUP_MISS : error1); } /* TODO maybe move to lookup? */ vnet_buffer (p0)->ip.fib_index = vec_elt (im->fib_index_by_sw_if_index, vnet_buffer (p0)->sw_if_index[VLIB_RX]); vnet_buffer (p0)->ip.fib_index = (vnet_buffer (p0)->sw_if_index[VLIB_TX] == (u32) ~ 0) ? vnet_buffer (p0)->ip. fib_index : vnet_buffer (p0)->sw_if_index[VLIB_TX]; vnet_buffer (p1)->ip.fib_index = vec_elt (im->fib_index_by_sw_if_index, vnet_buffer (p1)->sw_if_index[VLIB_RX]); vnet_buffer (p1)->ip.fib_index = (vnet_buffer (p1)->sw_if_index[VLIB_TX] == (u32) ~ 0) ? vnet_buffer (p1)->ip. fib_index : vnet_buffer (p1)->sw_if_index[VLIB_TX]; skip_checks: next0 = lm->local_next_by_ip_protocol[ip0->protocol]; next1 = lm->local_next_by_ip_protocol[ip1->protocol]; next0 = error0 != IP6_ERROR_UNKNOWN_PROTOCOL ? IP_LOCAL_NEXT_DROP : next0; next1 = error1 != IP6_ERROR_UNKNOWN_PROTOCOL ? IP_LOCAL_NEXT_DROP : next1; p0->error = error_node->errors[error0]; p1->error = error_node->errors[error1]; if (head_of_feature_arc) { if (PREDICT_TRUE (error0 == (u8) IP6_ERROR_UNKNOWN_PROTOCOL)) vnet_feature_arc_start (arc_index, vnet_buffer (p0)->sw_if_index [VLIB_RX], &next0, p0); if (PREDICT_TRUE (error1 == (u8) IP6_ERROR_UNKNOWN_PROTOCOL)) vnet_feature_arc_start (arc_index, vnet_buffer (p1)->sw_if_index [VLIB_RX], &next1, p1); } 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; ip6_header_t *ip0; udp_header_t *udp0; u32 pi0, ip_len0, udp_len0, flags0, next0; i32 len_diff0; u8 error0, type0, good_l4_csum0; u32 udp_offset0; u8 is_tcp_udp0; pi0 = to_next[0] = from[0]; from += 1; n_left_from -= 1; to_next += 1; n_left_to_next -= 1; error0 = IP6_ERROR_UNKNOWN_PROTOCOL; p0 = vlib_get_buffer (vm, pi0); ip0 = vlib_buffer_get_current (p0); if (head_of_feature_arc == 0) goto skip_check; vnet_buffer (p0)->l3_hdr_offset = p0->current_data; type0 = lm->builtin_protocol_by_ip_protocol[ip0->protocol]; flags0 = p0->flags; is_tcp_udp0 = ip6_next_proto_is_tcp_udp (p0, ip0, &udp_offset0); good_l4_csum0 = (flags0 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT && !(flags0 & VNET_BUFFER_F_OFFLOAD_TCP_CKSUM || flags0 & VNET_BUFFER_F_OFFLOAD_UDP_CKSUM)) != 0; len_diff0 = 0; if (PREDICT_TRUE (is_tcp_udp0)) { udp0 = (udp_header_t *) ((u8 *) ip0 + udp_offset0); /* Don't verify UDP checksum for packets with explicit zero * checksum. */ good_l4_csum0 |= type0 == IP_BUILTIN_PROTOCOL_UDP && udp0->checksum == 0; /* Verify UDP length. */ if (is_tcp_udp0 == IP_PROTOCOL_UDP) { ip_len0 = clib_net_to_host_u16 (ip0->payload_length); udp_len0 = clib_net_to_host_u16 (udp0->length); len_diff0 = ip_len0 - udp_len0; } } good_l4_csum0 |= type0 == IP_BUILTIN_PROTOCOL_UNKNOWN; len_diff0 = type0 == IP_BUILTIN_PROTOCOL_UDP ? len_diff0 : 0; if (PREDICT_FALSE (type0 != IP_BUILTIN_PROTOCOL_UNKNOWN && !good_l4_csum0 && !(flags0 & VNET_BUFFER_F_L4_CHECKSUM_COMPUTED))) { flags0 = ip6_tcp_udp_icmp_validate_checksum (vm, p0); good_l4_csum0 = (flags0 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0; } error0 = IP6_ERROR_UNKNOWN_PROTOCOL; error0 = len_diff0 < 0 ? IP6_ERROR_UDP_LENGTH : error0; ASSERT (IP6_ERROR_UDP_CHECKSUM + IP_BUILTIN_PROTOCOL_UDP == IP6_ERROR_UDP_CHECKSUM); ASSERT (IP6_ERROR_UDP_CHECKSUM + IP_BUILTIN_PROTOCOL_ICMP == IP6_ERROR_ICMP_CHECKSUM); error0 = (!good_l4_csum0 ? IP6_ERROR_UDP_CHECKSUM + type0 : error0); /* If this is a neighbor solicitation (ICMP), skip src RPF check */ if (error0 == IP6_ERROR_UNKNOWN_PROTOCOL && type0 != IP_BUILTIN_PROTOCOL_ICMP && !ip6_address_is_link_local_unicast (&ip0->src_address)) { error0 = (!ip6_urpf_loose_check (im, p0, ip0) ? IP6_ERROR_SRC_LOOKUP_MISS : error0); } vnet_buffer (p0)->ip.fib_index = vec_elt (im->fib_index_by_sw_if_index, vnet_buffer (p0)->sw_if_index[VLIB_RX]); vnet_buffer (p0)->ip.fib_index = (vnet_buffer (p0)->sw_if_index[VLIB_TX] == (u32) ~ 0) ? vnet_buffer (p0)->ip. fib_index : vnet_buffer (p0)->sw_if_index[VLIB_TX]; skip_check: next0 = lm->local_next_by_ip_protocol[ip0->protocol]; next0 = error0 != IP6_ERROR_UNKNOWN_PROTOCOL ? IP_LOCAL_NEXT_DROP : next0; p0->error = error_node->errors[error0]; if (head_of_feature_arc) { if (PREDICT_TRUE (error0 == (u8) IP6_ERROR_UNKNOWN_PROTOCOL)) vnet_feature_arc_start (arc_index, vnet_buffer (p0)->sw_if_index [VLIB_RX], &next0, p0); } 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 ip6_local (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame) { return ip6_local_inline (vm, node, frame, 1 /* head of feature arc */ ); } /* *INDENT-OFF* */ VLIB_REGISTER_NODE (ip6_local_node, static) = { .function = ip6_local, .name = "ip6-local", .vector_size = sizeof (u32), .format_trace = format_ip6_forward_next_trace, .n_next_nodes = IP_LOCAL_N_NEXT, .next_nodes = { [IP_LOCAL_NEXT_DROP] = "ip6-drop", [IP_LOCAL_NEXT_PUNT] = "ip6-punt", [IP_LOCAL_NEXT_UDP_LOOKUP] = "ip6-udp-lookup", [IP_LOCAL_NEXT_ICMP] = "ip6-icmp-input", }, }; /* *INDENT-ON* */ VLIB_NODE_FUNCTION_MULTIARCH (ip6_local_node, ip6_local); static uword ip6_local_end_of_arc (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame) { return ip6_local_inline (vm, node, frame, 0 /* head of feature arc */ ); } /* *INDENT-OFF* */ VLIB_REGISTER_NODE (ip6_local_end_of_arc_node,static) = { .function = ip6_local_end_of_arc, .name = "ip6-local-end-of-arc", .vector_size = sizeof (u32), .format_trace = format_ip6_forward_next_trace, .sibling_of = "ip6-local", }; VLIB_NODE_FUNCTION_MULTIARCH (ip6_local_end_of_arc_node, ip6_local_end_of_arc) VNET_FEATURE_INIT (ip6_local_end_of_arc, static) = { .arc_name = "ip6-local", .node_name = "ip6-local-end-of-arc", .runs_before = 0, /* not before any other features */ }; /* *INDENT-ON* */ void ip6_register_protocol (u32 protocol, u32 node_index) { vlib_main_t *vm = vlib_get_main (); ip6_main_t *im = &ip6_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, ip6_local_node.index, node_index); } typedef enum { IP6_DISCOVER_NEIGHBOR_NEXT_DROP, IP6_DISCOVER_NEIGHBOR_NEXT_REPLY_TX, IP6_DISCOVER_NEIGHBOR_N_NEXT, } ip6_discover_neighbor_next_t; typedef enum { IP6_DISCOVER_NEIGHBOR_ERROR_DROP, IP6_DISCOVER_NEIGHBOR_ERROR_REQUEST_SENT, IP6_DISCOVER_NEIGHBOR_ERROR_NO_SOURCE_ADDRESS, } ip6_discover_neighbor_error_t; static uword ip6_discover_neighbor_inline (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame, int is_glean) { vnet_main_t *vnm = vnet_get_main (); ip6_main_t *im = &ip6_main; ip_lookup_main_t *lm = &im->lookup_main; u32 *from, *to_next_drop; uword n_left_from, n_left_to_next_drop; static f64 time_last_seed_change = -1e100; static u32 hash_seeds[3]; static uword hash_bitmap[256 / BITS (uword)]; f64 time_now; int bogus_length; if (node->flags & VLIB_NODE_FLAG_TRACE) ip6_forward_next_trace (vm, node, frame, VLIB_TX); time_now = vlib_time_now (vm); if (time_now - time_last_seed_change > 1e-3) { uword i; u32 *r = clib_random_buffer_get_data (&vm->random_buffer, sizeof (hash_seeds)); for (i = 0; i < ARRAY_LEN (hash_seeds); i++) hash_seeds[i] = r[i]; /* Mark all hash keys as been not-seen before. */ for (i = 0; i < ARRAY_LEN (hash_bitmap); i++) hash_bitmap[i] = 0; time_last_seed_change = time_now; } from = vlib_frame_vector_args (frame); n_left_from = frame->n_vectors; while (n_left_from > 0) { vlib_get_next_frame (vm, node, IP6_DISCOVER_NEIGHBOR_NEXT_DROP, to_next_drop, n_left_to_next_drop); while (n_left_from > 0 && n_left_to_next_drop > 0) { vlib_buffer_t *p0; ip6_header_t *ip0; u32 pi0, adj_index0, a0, b0, c0, m0, sw_if_index0, drop0; uword bm0; ip_adjacency_t *adj0; vnet_hw_interface_t *hw_if0; u32 next0; pi0 = from[0]; p0 = vlib_get_buffer (vm, pi0); adj_index0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX]; ip0 = vlib_buffer_get_current (p0); adj0 = adj_get (adj_index0); if (!is_glean) { ip0->dst_address.as_u64[0] = adj0->sub_type.nbr.next_hop.ip6.as_u64[0]; ip0->dst_address.as_u64[1] = adj0->sub_type.nbr.next_hop.ip6.as_u64[1]; } a0 = hash_seeds[0]; b0 = hash_seeds[1]; c0 = hash_seeds[2]; sw_if_index0 = adj0->rewrite_header.sw_if_index; vnet_buffer (p0)->sw_if_index[VLIB_TX] = sw_if_index0; a0 ^= sw_if_index0; b0 ^= ip0->dst_address.as_u32[0]; c0 ^= ip0->dst_address.as_u32[1]; hash_v3_mix32 (a0, b0, c0); b0 ^= ip0->dst_address.as_u32[2]; c0 ^= ip0->dst_address.as_u32[3]; hash_v3_finalize32 (a0, b0, c0); c0 &= BITS (hash_bitmap) - 1; c0 = c0 / BITS (uword); m0 = (uword) 1 << (c0 % BITS (uword)); bm0 = hash_bitmap[c0]; drop0 = (bm0 & m0) != 0; /* Mark it as seen. */ hash_bitmap[c0] = bm0 | m0; from += 1; n_left_from -= 1; to_next_drop[0] = pi0; to_next_drop += 1; n_left_to_next_drop -= 1; hw_if0 = vnet_get_sup_hw_interface (vnm, sw_if_index0); /* If the interface is link-down, drop the pkt */ if (!(hw_if0->flags & VNET_HW_INTERFACE_FLAG_LINK_UP)) drop0 = 1; p0->error = node->errors[drop0 ? IP6_DISCOVER_NEIGHBOR_ERROR_DROP : IP6_DISCOVER_NEIGHBOR_ERROR_REQUEST_SENT]; if (drop0) 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) continue; { u32 bi0 = 0; icmp6_neighbor_solicitation_header_t *h0; vlib_buffer_t *b0; h0 = vlib_packet_template_get_packet (vm, &im->discover_neighbor_packet_template, &bi0); /* * Build ethernet header. * Choose source address based on destination lookup * adjacency. */ if (ip6_src_address_for_packet (lm, sw_if_index0, &h0->ip.src_address)) { /* There is no address on the interface */ p0->error = node->errors[IP6_DISCOVER_NEIGHBOR_ERROR_NO_SOURCE_ADDRESS]; vlib_buffer_free (vm, &bi0, 1); continue; } /* * Destination address is a solicited node multicast address. * We need to fill in * the low 24 bits with low 24 bits of target's address. */ h0->ip.dst_address.as_u8[13] = ip0->dst_address.as_u8[13]; h0->ip.dst_address.as_u8[14] = ip0->dst_address.as_u8[14]; h0->ip.dst_address.as_u8[15] = ip0->dst_address.as_u8[15]; h0->neighbor.target_address = ip0->dst_address; clib_memcpy (h0->link_layer_option.ethernet_address, hw_if0->hw_address, vec_len (hw_if0->hw_address)); /* $$$$ appears we need this; why is the checksum non-zero? */ h0->neighbor.icmp.checksum = 0; h0->neighbor.icmp.checksum = ip6_tcp_udp_icmp_compute_checksum (vm, 0, &h0->ip, &bogus_length); ASSERT (bogus_length == 0); vlib_buffer_copy_trace_flag (vm, p0, bi0); b0 = vlib_get_buffer (vm, bi0); vnet_buffer (b0)->sw_if_index[VLIB_TX] = vnet_buffer (p0)->sw_if_index[VLIB_TX]; /* Add rewrite/encap string. */ vnet_rewrite_one_header (adj0[0], h0, sizeof (ethernet_header_t)); vlib_buffer_advance (b0, -adj0->rewrite_header.data_bytes); next0 = IP6_DISCOVER_NEIGHBOR_NEXT_REPLY_TX; vlib_set_next_frame_buffer (vm, node, next0, bi0); } } vlib_put_next_frame (vm, node, IP6_DISCOVER_NEIGHBOR_NEXT_DROP, n_left_to_next_drop); } return frame->n_vectors; } static uword ip6_discover_neighbor (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame) { return (ip6_discover_neighbor_inline (vm, node, frame, 0)); } static uword ip6_glean (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame) { return (ip6_discover_neighbor_inline (vm, node, frame, 1)); } static char *ip6_discover_neighbor_error_strings[] = { [IP6_DISCOVER_NEIGHBOR_ERROR_DROP] = "address overflow drops", [IP6_DISCOVER_NEIGHBOR_ERROR_REQUEST_SENT] = "neighbor solicitations sent", [IP6_DISCOVER_NEIGHBOR_ERROR_NO_SOURCE_ADDRESS] = "no source address for ND solicitation", }; /* *INDENT-OFF* */ VLIB_REGISTER_NODE (ip6_discover_neighbor_node) = { .function = ip6_discover_neighbor, .name = "ip6-discover-neighbor", .vector_size = sizeof (u32), .format_trace = format_ip6_forward_next_trace, .n_errors = ARRAY_LEN (ip6_discover_neighbor_error_strings), .error_strings = ip6_discover_neighbor_error_strings, .n_next_nodes = IP6_DISCOVER_NEIGHBOR_N_NEXT, .next_nodes = { [IP6_DISCOVER_NEIGHBOR_NEXT_DROP] = "error-drop", [IP6_DISCOVER_NEIGHBOR_NEXT_REPLY_TX] = "interface-output", }, }; /* *INDENT-ON* */ /* *INDENT-OFF* */ VLIB_REGISTER_NODE (ip6_glean_node) = { .function = ip6_glean, .name = "ip6-glean", .vector_size = sizeof (u32), .format_trace = format_ip6_forward_next_trace, .n_errors = ARRAY_LEN (ip6_discover_neighbor_error_strings), .error_strings = ip6_discover_neighbor_error_strings, .n_next_nodes = IP6_DISCOVER_NEIGHBOR_N_NEXT, .next_nodes = { [IP6_DISCOVER_NEIGHBOR_NEXT_DROP] = "error-drop", [IP6_DISCOVER_NEIGHBOR_NEXT_REPLY_TX] = "interface-output", }, }; /* *INDENT-ON* */ clib_error_t * ip6_probe_neighbor (vlib_main_t * vm, ip6_address_t * dst, u32 sw_if_index) { vnet_main_t *vnm = vnet_get_main (); ip6_main_t *im = &ip6_main; icmp6_neighbor_solicitation_header_t *h; ip6_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; int bogus_length; 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_ip6_address, dst, format_vnet_sw_if_index_name, vnm, sw_if_index); } src = ip6_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_ip6_address, dst, format_vnet_sw_if_index_name, vnm, sw_if_index); } h = vlib_packet_template_get_packet (vm, &im->discover_neighbor_packet_template, &bi); hi = vnet_get_sup_hw_interface (vnm, sw_if_index); /* Destination address is a solicited node multicast address. We need to fill in the low 24 bits with low 24 bits of target's address. */ h->ip.dst_address.as_u8[13] = dst->as_u8[13]; h->ip.dst_address.as_u8[14] = dst->as_u8[14]; h->ip.dst_address.as_u8[15] = dst->as_u8[15]; h->ip.src_address = src[0]; h->neighbor.target_address = dst[0]; if (PREDICT_FALSE (!hi->hw_address)) { return clib_error_return (0, "%U: interface %U do not support ip probe", format_ip6_address, dst, format_vnet_sw_if_index_name, vnm, sw_if_index); } clib_memcpy (h->link_layer_option.ethernet_address, hi->hw_address, vec_len (hi->hw_address)); h->neighbor.icmp.checksum = ip6_tcp_udp_icmp_compute_checksum (vm, 0, &h->ip, &bogus_length); ASSERT (bogus_length == 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; /* Add encapsulation string for software interface (e.g. ethernet header). */ ip46_address_t nh = { .ip6 = *dst, }; ai = adj_nbr_add_or_lock (FIB_PROTOCOL_IP6, VNET_LINK_IP6, &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) { adj_unlock (ai); ai = adj_glean_add_or_lock (FIB_PROTOCOL_IP6, sw_if_index, &nh); adj = adj_get (ai); } vnet_rewrite_one_header (adj[0], h, sizeof (ethernet_header_t)); 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; } typedef enum { IP6_REWRITE_NEXT_DROP, IP6_REWRITE_NEXT_ICMP_ERROR, } ip6_rewrite_next_t; always_inline uword ip6_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 = &ip6_main.lookup_main; u32 *from = vlib_frame_vector_args (frame); u32 n_left_from, n_left_to_next, *to_next, next_index; vlib_node_runtime_t *error_node = vlib_node_get_runtime (vm, ip6_input_node.index); n_left_from = frame->n_vectors; next_index = node->cached_next_index; u32 thread_index = vlib_get_thread_index (); while (n_left_from > 0) { vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next); while (n_left_from >= 4 && n_left_to_next >= 2) { ip_adjacency_t *adj0, *adj1; vlib_buffer_t *p0, *p1; ip6_header_t *ip0, *ip1; u32 pi0, rw_len0, next0, error0, adj_index0; u32 pi1, rw_len1, next1, error1, adj_index1; u32 tx_sw_if_index0, tx_sw_if_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->pre_data, 32, STORE); CLIB_PREFETCH (p3->pre_data, 32, 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); adj_index0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX]; adj_index1 = vnet_buffer (p1)->ip.adj_index[VLIB_TX]; ip0 = vlib_buffer_get_current (p0); ip1 = vlib_buffer_get_current (p1); error0 = error1 = IP6_ERROR_NONE; next0 = next1 = IP6_REWRITE_NEXT_DROP; if (PREDICT_TRUE (!(p0->flags & VNET_BUFFER_F_LOCALLY_ORIGINATED))) { i32 hop_limit0 = ip0->hop_limit; /* Input node should have reject packets with hop limit 0. */ ASSERT (ip0->hop_limit > 0); hop_limit0 -= 1; ip0->hop_limit = hop_limit0; /* * If the hop count drops below 1 when forwarding, generate * an ICMP response. */ if (PREDICT_FALSE (hop_limit0 <= 0)) { error0 = IP6_ERROR_TIME_EXPIRED; next0 = IP6_REWRITE_NEXT_ICMP_ERROR; vnet_buffer (p0)->sw_if_index[VLIB_TX] = (u32) ~ 0; icmp6_error_set_vnet_buffer (p0, ICMP6_time_exceeded, ICMP6_time_exceeded_ttl_exceeded_in_transit, 0); } } else { p0->flags &= ~VNET_BUFFER_F_LOCALLY_ORIGINATED; } if (PREDICT_TRUE (!(p1->flags & VNET_BUFFER_F_LOCALLY_ORIGINATED))) { i32 hop_limit1 = ip1->hop_limit; /* Input node should have reject packets with hop limit 0. */ ASSERT (ip1->hop_limit > 0); hop_limit1 -= 1; ip1->hop_limit = hop_limit1; /* * If the hop count drops below 1 when forwarding, generate * an ICMP response. */ if (PREDICT_FALSE (hop_limit1 <= 0)) { error1 = IP6_ERROR_TIME_EXPIRED; next1 = IP6_REWRITE_NEXT_ICMP_ERROR; vnet_buffer (p1)->sw_if_index[VLIB_TX] = (u32) ~ 0; icmp6_error_set_vnet_buffer (p1, ICMP6_time_exceeded, ICMP6_time_exceeded_ttl_exceeded_in_transit, 0); } } else { p1->flags &= ~VNET_BUFFER_F_LOCALLY_ORIGINATED; } adj0 = adj_get (adj_index0); adj1 = adj_get (adj_index1); rw_len0 = adj0[0].rewrite_header.data_bytes; rw_len1 = adj1[0].rewrite_header.data_bytes; vnet_buffer (p0)->ip.save_rewrite_length = rw_len0; vnet_buffer (p1)->ip.save_rewrite_length = rw_len1; if (do_counters) { vlib_increment_combined_counter (&adjacency_counters, thread_index, adj_index0, 1, vlib_buffer_length_in_chain (vm, p0) + rw_len0); vlib_increment_combined_counter (&adjacency_counters, thread_index, adj_index1, 1, vlib_buffer_length_in_chain (vm, p1) + rw_len1); } /* Check MTU of outgoing interface. */ error0 = (vlib_buffer_length_in_chain (vm, p0) > adj0[0]. rewrite_header.max_l3_packet_bytes ? IP6_ERROR_MTU_EXCEEDED : error0); error1 = (vlib_buffer_length_in_chain (vm, p1) > adj1[0]. rewrite_header.max_l3_packet_bytes ? IP6_ERROR_MTU_EXCEEDED : error1); /* Don't adjust the buffer for hop count issue; icmp-error node * wants to see the IP headerr */ if (PREDICT_TRUE (error0 == IP6_ERROR_NONE)) { p0->current_data -= rw_len0; p0->current_length += rw_len0; tx_sw_if_index0 = adj0[0].rewrite_header.sw_if_index; vnet_buffer (p0)->sw_if_index[VLIB_TX] = tx_sw_if_index0; next0 = adj0[0].rewrite_header.next_index; 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, &next0, p0); } if (PREDICT_TRUE (error1 == IP6_ERROR_NONE)) { p1->current_data -= rw_len1; p1->current_length += rw_len1; tx_sw_if_index1 = adj1[0].rewrite_header.sw_if_index; vnet_buffer (p1)->sw_if_index[VLIB_TX] = tx_sw_if_index1; next1 = adj1[0].rewrite_header.next_index; 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, &next1, p1); } /* Guess we are only writing on simple Ethernet header. */ vnet_rewrite_two_headers (adj0[0], adj1[0], ip0, ip1, sizeof (ethernet_header_t)); if (is_midchain) { adj0->sub_type.midchain.fixup_func (vm, adj0, p0); adj1->sub_type.midchain.fixup_func (vm, adj1, p1); } if (is_mcast) { /* * copy bytes from the IP address into the MAC rewrite */ vnet_fixup_one_header (adj0[0], &ip0->dst_address, ip0); vnet_fixup_one_header (adj1[0], &ip1->dst_address, ip1); } 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) { ip_adjacency_t *adj0; vlib_buffer_t *p0; ip6_header_t *ip0; u32 pi0, rw_len0; u32 adj_index0, next0, error0; u32 tx_sw_if_index0; pi0 = to_next[0] = from[0]; p0 = vlib_get_buffer (vm, pi0); adj_index0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX]; adj0 = adj_get (adj_index0); ip0 = vlib_buffer_get_current (p0); error0 = IP6_ERROR_NONE; next0 = IP6_REWRITE_NEXT_DROP; /* Check hop limit */ if (PREDICT_TRUE (!(p0->flags & VNET_BUFFER_F_LOCALLY_ORIGINATED))) { i32 hop_limit0 = ip0->hop_limit; ASSERT (ip0->hop_limit > 0); hop_limit0 -= 1; ip0->hop_limit = hop_limit0; if (PREDICT_FALSE (hop_limit0 <= 0)) { /* * If the hop count drops below 1 when forwarding, generate * an ICMP response. */ error0 = IP6_ERROR_TIME_EXPIRED; next0 = IP6_REWRITE_NEXT_ICMP_ERROR; vnet_buffer (p0)->sw_if_index[VLIB_TX] = (u32) ~ 0; icmp6_error_set_vnet_buffer (p0, ICMP6_time_exceeded, ICMP6_time_exceeded_ttl_exceeded_in_transit, 0); } } else { p0->flags &= ~VNET_BUFFER_F_LOCALLY_ORIGINATED; } /* Guess we are only writing on simple Ethernet header. */ vnet_rewrite_one_header (adj0[0], ip0, sizeof (ethernet_header_t)); /* Update packet buffer attributes/set output interface. */ rw_len0 = adj0[0].rewrite_header.data_bytes; vnet_buffer (p0)->ip.save_rewrite_length = rw_len0; if (do_counters) { vlib_increment_combined_counter (&adjacency_counters, thread_index, adj_index0, 1, vlib_buffer_length_in_chain (vm, p0) + rw_len0); } /* Check MTU of outgoing interface. */ error0 = (vlib_buffer_length_in_chain (vm, p0) > adj0[0]. rewrite_header.max_l3_packet_bytes ? IP6_ERROR_MTU_EXCEEDED : error0); /* Don't adjust the buffer for hop count issue; icmp-error node * wants to see the IP headerr */ if (PREDICT_TRUE (error0 == IP6_ERROR_NONE)) { p0->current_data -= rw_len0; p0->current_length += rw_len0; tx_sw_if_index0 = adj0[0].rewrite_header.sw_if_index; vnet_buffer (p0)->sw_if_index[VLIB_TX] = tx_sw_if_index0; next0 = adj0[0].rewrite_header.next_index; 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, &next0, p0); } if (is_midchain) { adj0->sub_type.midchain.fixup_func (vm, adj0, p0); } if (is_mcast) { vnet_fixup_one_header (adj0[0], &ip0->dst_address, ip0); } p0->error = error_node->errors[error0]; from += 1; n_left_from -= 1; to_next += 1; n_left_to_next -= 1; 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); } /* Need to do trace after rewrites to pick up new packet data. */ if (node->flags & VLIB_NODE_FLAG_TRACE) ip6_forward_next_trace (vm, node, frame, VLIB_TX); return frame->n_vectors; } static uword ip6_rewrite (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame) { if (adj_are_counters_enabled ()) return ip6_rewrite_inline (vm, node, frame, 1, 0, 0); else return ip6_rewrite_inline (vm, node, frame, 0, 0, 0); } static uword ip6_rewrite_mcast (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame) { if (adj_are_counters_enabled ()) return ip6_rewrite_inline (vm, node, frame, 1, 0, 1); else return ip6_rewrite_inline (vm, node, frame, 0, 0, 1); } static uword ip6_midchain (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame) { if (adj_are_counters_enabled ()) return ip6_rewrite_inline (vm, node, frame, 1, 1, 0); else return ip6_rewrite_inline (vm, node, frame, 0, 1, 0); } static uword ip6_mcast_midchain (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame) { if (adj_are_counters_enabled ()) return ip6_rewrite_inline (vm, node, frame, 1, 1, 1); else return ip6_rewrite_inline (vm, node, frame, 0, 1, 1); } /* *INDENT-OFF* */ VLIB_REGISTER_NODE (ip6_midchain_node) = { .function = ip6_midchain, .name = "ip6-midchain", .vector_size = sizeof (u32), .format_trace = format_ip6_forward_next_trace, .sibling_of = "ip6-rewrite", }; /* *INDENT-ON* */ VLIB_NODE_FUNCTION_MULTIARCH (ip6_midchain_node, ip6_midchain); /* *INDENT-OFF* */ VLIB_REGISTER_NODE (ip6_rewrite_node) = { .function = ip6_rewrite, .name = "ip6-rewrite", .vector_size = sizeof (u32), .format_trace = format_ip6_rewrite_trace, .n_next_nodes = 2, .next_nodes = { [IP6_REWRITE_NEXT_DROP] = "error-drop", [IP6_REWRITE_NEXT_ICMP_ERROR] = "ip6-icmp-error", }, }; /* *INDENT-ON* */ VLIB_NODE_FUNCTION_MULTIARCH (ip6_rewrite_node, ip6_rewrite); /* *INDENT-OFF* */ VLIB_REGISTER_NODE (ip6_rewrite_mcast_node) = { .function = ip6_rewrite_mcast, .name = "ip6-rewrite-mcast", .vector_size = sizeof (u32), .format_trace = format_ip6_rewrite_trace, .sibling_of = "ip6-rewrite", }; /* *INDENT-ON* */ VLIB_NODE_FUNCTION_MULTIARCH (ip6_rewrite_mcast_node, ip6_rewrite_mcast); /* *INDENT-OFF* */ VLIB_REGISTER_NODE (ip6_mcast_midchain_node, static) = { .function = ip6_mcast_midchain, .name = "ip6-mcast-midchain", .vector_size = sizeof (u32), .format_trace = format_ip6_rewrite_trace, .sibling_of = "ip6-rewrite", }; /* *INDENT-ON* */ VLIB_NODE_FUNCTION_MULTIARCH (ip6_mcast_midchain_node, ip6_mcast_midchain); /* * Hop-by-Hop handling */ ip6_hop_by_hop_main_t ip6_hop_by_hop_main; #define foreach_ip6_hop_by_hop_error \ _(PROCESSED, "pkts with ip6 hop-by-hop options") \ _(FORMAT, "incorrectly formatted hop-by-hop options") \ _(UNKNOWN_OPTION, "unknown ip6 hop-by-hop options") /* *INDENT-OFF* */ typedef enum { #define _(sym,str) IP6_HOP_BY_HOP_ERROR_##sym, foreach_ip6_hop_by_hop_error #undef _ IP6_HOP_BY_HOP_N_ERROR, } ip6_hop_by_hop_error_t; /* *INDENT-ON* */ /* * Primary h-b-h handler trace support * We work pretty hard on the problem for obvious reasons */ typedef struct { u32 next_index; u32 trace_len; u8 option_data[256]; } ip6_hop_by_hop_trace_t; vlib_node_registration_t ip6_hop_by_hop_node; static char *ip6_hop_by_hop_error_strings[] = { #define _(sym,string) string, foreach_ip6_hop_by_hop_error #undef _ }; u8 * format_ip6_hop_by_hop_ext_hdr (u8 * s, va_list * args) { ip6_hop_by_hop_header_t *hbh0 = va_arg (*args, ip6_hop_by_hop_header_t *); int total_len = va_arg (*args, int); ip6_hop_by_hop_option_t *opt0, *limit0; ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main; u8 type0; s = format (s, "IP6_HOP_BY_HOP: next protocol %d len %d total %d", hbh0->protocol, (hbh0->length + 1) << 3, total_len); opt0 = (ip6_hop_by_hop_option_t *) (hbh0 + 1); limit0 = (ip6_hop_by_hop_option_t *) ((u8 *) hbh0 + total_len); while (opt0 < limit0) { type0 = opt0->type; switch (type0) { case 0: /* Pad, just stop */ opt0 = (ip6_hop_by_hop_option_t *) ((u8 *) opt0 + 1); break; default: if (hm->trace[type0]) { s = (*hm->trace[type0]) (s, opt0); } else { s = format (s, "\n unrecognized option %d length %d", type0, opt0->length); } opt0 = (ip6_hop_by_hop_option_t *) (((u8 *) opt0) + opt0->length + sizeof (ip6_hop_by_hop_option_t)); break; } } return s; } static u8 * format_ip6_hop_by_hop_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 *); ip6_hop_by_hop_trace_t *t = va_arg (*args, ip6_hop_by_hop_trace_t *); ip6_hop_by_hop_header_t *hbh0; ip6_hop_by_hop_option_t *opt0, *limit0; ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main; u8 type0; hbh0 = (ip6_hop_by_hop_header_t *) t->option_data; s = format (s, "IP6_HOP_BY_HOP: next index %d len %d traced %d", t->next_index, (hbh0->length + 1) << 3, t->trace_len); opt0 = (ip6_hop_by_hop_option_t *) (hbh0 + 1); limit0 = (ip6_hop_by_hop_option_t *) ((u8 *) hbh0) + t->trace_len; while (opt0 < limit0) { type0 = opt0->type; switch (type0) { case 0: /* Pad, just stop */ opt0 = (ip6_hop_by_hop_option_t *) ((u8 *) opt0) + 1; break; default: if (hm->trace[type0]) { s = (*hm->trace[type0]) (s, opt0); } else { s = format (s, "\n unrecognized option %d length %d", type0, opt0->length); } opt0 = (ip6_hop_by_hop_option_t *) (((u8 *) opt0) + opt0->length + sizeof (ip6_hop_by_hop_option_t)); break; } } return s; } always_inline u8 ip6_scan_hbh_options (vlib_buffer_t * b0, ip6_header_t * ip0, ip6_hop_by_hop_header_t * hbh0, ip6_hop_by_hop_option_t * opt0, ip6_hop_by_hop_option_t * limit0, u32 * next0) { ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main; u8 type0; u8 error0 = 0; while (opt0 < limit0) { type0 = opt0->type; switch (type0) { case 0: /* Pad1 */ opt0 = (ip6_hop_by_hop_option_t *) ((u8 *) opt0) + 1; continue; case 1: /* PadN */ break; default: if (hm->options[type0]) { if ((*hm->options[type0]) (b0, ip0, opt0) < 0) { error0 = IP6_HOP_BY_HOP_ERROR_FORMAT; return (error0); } } else { /* Unrecognized mandatory option, check the two high order bits */ switch (opt0->type & HBH_OPTION_TYPE_HIGH_ORDER_BITS) { case HBH_OPTION_TYPE_SKIP_UNKNOWN: break; case HBH_OPTION_TYPE_DISCARD_UNKNOWN: error0 = IP6_HOP_BY_HOP_ERROR_UNKNOWN_OPTION; *next0 = IP_LOOKUP_NEXT_DROP; break; case HBH_OPTION_TYPE_DISCARD_UNKNOWN_ICMP: error0 = IP6_HOP_BY_HOP_ERROR_UNKNOWN_OPTION; *next0 = IP_LOOKUP_NEXT_ICMP_ERROR; icmp6_error_set_vnet_buffer (b0, ICMP6_parameter_problem, ICMP6_parameter_problem_unrecognized_option, (u8 *) opt0 - (u8 *) ip0); break; case HBH_OPTION_TYPE_DISCARD_UNKNOWN_ICMP_NOT_MCAST: error0 = IP6_HOP_BY_HOP_ERROR_UNKNOWN_OPTION; if (!ip6_address_is_multicast (&ip0->dst_address)) { *next0 = IP_LOOKUP_NEXT_ICMP_ERROR; icmp6_error_set_vnet_buffer (b0, ICMP6_parameter_problem, ICMP6_parameter_problem_unrecognized_option, (u8 *) opt0 - (u8 *) ip0); } else { *next0 = IP_LOOKUP_NEXT_DROP; } break; } return (error0); } } opt0 = (ip6_hop_by_hop_option_t *) (((u8 *) opt0) + opt0->length + sizeof (ip6_hop_by_hop_option_t)); } return (error0); } /* * Process the Hop-by-Hop Options header */ static uword ip6_hop_by_hop (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame) { vlib_node_runtime_t *error_node = vlib_node_get_runtime (vm, ip6_hop_by_hop_node.index); ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main; u32 n_left_from, *from, *to_next; ip_lookup_next_t next_index; 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) { u32 bi0, bi1; vlib_buffer_t *b0, *b1; u32 next0, next1; ip6_header_t *ip0, *ip1; ip6_hop_by_hop_header_t *hbh0, *hbh1; ip6_hop_by_hop_option_t *opt0, *limit0, *opt1, *limit1; u8 error0 = 0, error1 = 0; /* 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, 2 * CLIB_CACHE_LINE_BYTES, LOAD); CLIB_PREFETCH (p3->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD); } /* Speculatively enqueue b0, b1 to the current next frame */ to_next[0] = bi0 = from[0]; to_next[1] = bi1 = 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); /* Default use the next_index from the adjacency. A HBH option rarely redirects to a different node */ u32 adj_index0 = vnet_buffer (b0)->ip.adj_index[VLIB_TX]; ip_adjacency_t *adj0 = adj_get (adj_index0); u32 adj_index1 = vnet_buffer (b1)->ip.adj_index[VLIB_TX]; ip_adjacency_t *adj1 = adj_get (adj_index1); /* Default use the next_index from the adjacency. A HBH option rarely redirects to a different node */ next0 = adj0->lookup_next_index; next1 = adj1->lookup_next_index; ip0 = vlib_buffer_get_current (b0); ip1 = vlib_buffer_get_current (b1); hbh0 = (ip6_hop_by_hop_header_t *) (ip0 + 1); hbh1 = (ip6_hop_by_hop_header_t *) (ip1 + 1); opt0 = (ip6_hop_by_hop_option_t *) (hbh0 + 1); opt1 = (ip6_hop_by_hop_option_t *) (hbh1 + 1); limit0 = (ip6_hop_by_hop_option_t *) ((u8 *) hbh0 + ((hbh0->length + 1) << 3)); limit1 = (ip6_hop_by_hop_option_t *) ((u8 *) hbh1 + ((hbh1->length + 1) << 3)); /* * Basic validity checks */ if ((hbh0->length + 1) << 3 > clib_net_to_host_u16 (ip0->payload_length)) { error0 = IP6_HOP_BY_HOP_ERROR_FORMAT; next0 = IP_LOOKUP_NEXT_DROP; goto outdual; } /* Scan the set of h-b-h options, process ones that we understand */ error0 = ip6_scan_hbh_options (b0, ip0, hbh0, opt0, limit0, &next0); if ((hbh1->length + 1) << 3 > clib_net_to_host_u16 (ip1->payload_length)) { error1 = IP6_HOP_BY_HOP_ERROR_FORMAT; next1 = IP_LOOKUP_NEXT_DROP; goto outdual; } /* Scan the set of h-b-h options, process ones that we understand */ error1 = ip6_scan_hbh_options (b1, ip1, hbh1, opt1, limit1, &next1); outdual: /* Has the classifier flagged this buffer for special treatment? */ if (PREDICT_FALSE ((error0 == 0) && (vnet_buffer (b0)->l2_classify.opaque_index & OI_DECAP))) next0 = hm->next_override; /* Has the classifier flagged this buffer for special treatment? */ if (PREDICT_FALSE ((error1 == 0) && (vnet_buffer (b1)->l2_classify.opaque_index & OI_DECAP))) next1 = hm->next_override; if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE))) { if (b0->flags & VLIB_BUFFER_IS_TRACED) { ip6_hop_by_hop_trace_t *t = vlib_add_trace (vm, node, b0, sizeof (*t)); u32 trace_len = (hbh0->length + 1) << 3; t->next_index = next0; /* Capture the h-b-h option verbatim */ trace_len = trace_len < ARRAY_LEN (t->option_data) ? trace_len : ARRAY_LEN (t->option_data); t->trace_len = trace_len; clib_memcpy (t->option_data, hbh0, trace_len); } if (b1->flags & VLIB_BUFFER_IS_TRACED) { ip6_hop_by_hop_trace_t *t = vlib_add_trace (vm, node, b1, sizeof (*t)); u32 trace_len = (hbh1->length + 1) << 3; t->next_index = next1; /* Capture the h-b-h option verbatim */ trace_len = trace_len < ARRAY_LEN (t->option_data) ? trace_len : ARRAY_LEN (t->option_data); t->trace_len = trace_len; clib_memcpy (t->option_data, hbh1, trace_len); } } b0->error = error_node->errors[error0]; b1->error = error_node->errors[error1]; /* verify speculative enqueue, maybe switch current next frame */ 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) { u32 bi0; vlib_buffer_t *b0; u32 next0; ip6_header_t *ip0; ip6_hop_by_hop_header_t *hbh0; ip6_hop_by_hop_option_t *opt0, *limit0; u8 error0 = 0; /* Speculatively enqueue b0 to the current next frame */ 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); /* * Default use the next_index from the adjacency. * A HBH option rarely redirects to a different node */ u32 adj_index0 = vnet_buffer (b0)->ip.adj_index[VLIB_TX]; ip_adjacency_t *adj0 = adj_get (adj_index0); next0 = adj0->lookup_next_index; ip0 = vlib_buffer_get_current (b0); hbh0 = (ip6_hop_by_hop_header_t *) (ip0 + 1); opt0 = (ip6_hop_by_hop_option_t *) (hbh0 + 1); limit0 = (ip6_hop_by_hop_option_t *) ((u8 *) hbh0 + ((hbh0->length + 1) << 3)); /* * Basic validity checks */ if ((hbh0->length + 1) << 3 > clib_net_to_host_u16 (ip0->payload_length)) { error0 = IP6_HOP_BY_HOP_ERROR_FORMAT; next0 = IP_LOOKUP_NEXT_DROP; goto out0; } /* Scan the set of h-b-h options, process ones that we understand */ error0 = ip6_scan_hbh_options (b0, ip0, hbh0, opt0, limit0, &next0); out0: /* Has the classifier flagged this buffer for special treatment? */ if (PREDICT_FALSE ((error0 == 0) && (vnet_buffer (b0)->l2_classify.opaque_index & OI_DECAP))) next0 = hm->next_override; if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED)) { ip6_hop_by_hop_trace_t *t = vlib_add_trace (vm, node, b0, sizeof (*t)); u32 trace_len = (hbh0->length + 1) << 3; t->next_index = next0; /* Capture the h-b-h option verbatim */ trace_len = trace_len < ARRAY_LEN (t->option_data) ? trace_len : ARRAY_LEN (t->option_data); t->trace_len = trace_len; clib_memcpy (t->option_data, hbh0, trace_len); } b0->error = error_node->errors[error0]; /* verify speculative enqueue, maybe switch current next frame */ 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); } return frame->n_vectors; } /* *INDENT-OFF* */ VLIB_REGISTER_NODE (ip6_hop_by_hop_node) = { .function = ip6_hop_by_hop, .name = "ip6-hop-by-hop", .sibling_of = "ip6-lookup", .vector_size = sizeof (u32), .format_trace = format_ip6_hop_by_hop_trace, .type = VLIB_NODE_TYPE_INTERNAL, .n_errors = ARRAY_LEN (ip6_hop_by_hop_error_strings), .error_strings = ip6_hop_by_hop_error_strings, .n_next_nodes = 0, }; /* *INDENT-ON* */ VLIB_NODE_FUNCTION_MULTIARCH (ip6_hop_by_hop_node, ip6_hop_by_hop); static clib_error_t * ip6_hop_by_hop_init (vlib_main_t * vm) { ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main; memset (hm->options, 0, sizeof (hm->options)); memset (hm->trace, 0, sizeof (hm->trace)); hm->next_override = IP6_LOOKUP_NEXT_POP_HOP_BY_HOP; return (0); } VLIB_INIT_FUNCTION (ip6_hop_by_hop_init); void ip6_hbh_set_next_override (uword next) { ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main; hm->next_override = next; } int ip6_hbh_register_option (u8 option, int options (vlib_buffer_t * b, ip6_header_t * ip, ip6_hop_by_hop_option_t * opt), u8 * trace (u8 * s, ip6_hop_by_hop_option_t * opt)) { ip6_main_t *im = &ip6_main; ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main; ASSERT (option < ARRAY_LEN (hm->options)); /* Already registered */ if (hm->options[option]) return (-1); hm->options[option] = options; hm->trace[option] = trace; /* Set global variable */ im->hbh_enabled = 1; return (0); } int ip6_hbh_unregister_option (u8 option) { ip6_main_t *im = &ip6_main; ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main; ASSERT (option < ARRAY_LEN (hm->options)); /* Not registered */ if (!hm->options[option]) return (-1); hm->options[option] = NULL; hm->trace[option] = NULL; /* Disable global knob if this was the last option configured */ int i; bool found = false; for (i = 0; i < 256; i++) { if (hm->options[option]) { found = true; break; } } if (!found) im->hbh_enabled = 0; return (0); } /* Global IP6 main. */ ip6_main_t ip6_main; static clib_error_t * ip6_lookup_init (vlib_main_t * vm) { ip6_main_t *im = &ip6_main; clib_error_t *error; uword i; if ((error = vlib_call_init_function (vm, vnet_feature_init))) return error; for (i = 0; i < ARRAY_LEN (im->fib_masks); i++) { u32 j, i0, i1; i0 = i / 32; i1 = i % 32; for (j = 0; j < i0; j++) im->fib_masks[i].as_u32[j] = ~0; if (i1) im->fib_masks[i].as_u32[i0] = clib_host_to_net_u32 (pow2_mask (i1) << (32 - i1)); } ip_lookup_init (&im->lookup_main, /* is_ip6 */ 1); if (im->lookup_table_nbuckets == 0) im->lookup_table_nbuckets = IP6_FIB_DEFAULT_HASH_NUM_BUCKETS; im->lookup_table_nbuckets = 1 << max_log2 (im->lookup_table_nbuckets); if (im->lookup_table_size == 0) im->lookup_table_size = IP6_FIB_DEFAULT_HASH_MEMORY_SIZE; BV (clib_bihash_init) (&(im->ip6_table[IP6_FIB_TABLE_FWDING].ip6_hash), "ip6 FIB fwding table", im->lookup_table_nbuckets, im->lookup_table_size); BV (clib_bihash_init) (&im->ip6_table[IP6_FIB_TABLE_NON_FWDING].ip6_hash, "ip6 FIB non-fwding table", im->lookup_table_nbuckets, im->lookup_table_size); /* Create FIB with index 0 and table id of 0. */ fib_table_find_or_create_and_lock (FIB_PROTOCOL_IP6, 0, FIB_SOURCE_DEFAULT_ROUTE); mfib_table_find_or_create_and_lock (FIB_PROTOCOL_IP6, 0, MFIB_SOURCE_DEFAULT_ROUTE); { pg_node_t *pn; pn = pg_get_node (ip6_lookup_node.index); pn->unformat_edit = unformat_pg_ip6_header; } /* Unless explicitly configured, don't process HBH options */ im->hbh_enabled = 0; { icmp6_neighbor_solicitation_header_t p; memset (&p, 0, sizeof (p)); p.ip.ip_version_traffic_class_and_flow_label = clib_host_to_net_u32 (0x6 << 28); p.ip.payload_length = clib_host_to_net_u16 (sizeof (p) - STRUCT_OFFSET_OF (icmp6_neighbor_solicitation_header_t, neighbor)); p.ip.protocol = IP_PROTOCOL_ICMP6; p.ip.hop_limit = 255; ip6_set_solicited_node_multicast_address (&p.ip.dst_address, 0); p.neighbor.icmp.type = ICMP6_neighbor_solicitation; p.link_layer_option.header.type = ICMP6_NEIGHBOR_DISCOVERY_OPTION_source_link_layer_address; p.link_layer_option.header.n_data_u64s = sizeof (p.link_layer_option) / sizeof (u64); vlib_packet_template_init (vm, &im->discover_neighbor_packet_template, &p, sizeof (p), /* alloc chunk size */ 8, "ip6 neighbor discovery"); } return error; } VLIB_INIT_FUNCTION (ip6_lookup_init); void ip6_link_local_address_from_ethernet_mac_address (ip6_address_t * ip, u8 * mac) { ip->as_u64[0] = clib_host_to_net_u64 (0xFE80000000000000ULL); /* Invert the "u" bit */ ip->as_u8[8] = mac[0] ^ (1 << 1); ip->as_u8[9] = mac[1]; ip->as_u8[10] = mac[2]; ip->as_u8[11] = 0xFF; ip->as_u8[12] = 0xFE; ip->as_u8[13] = mac[3]; ip->as_u8[14] = mac[4]; ip->as_u8[15] = mac[5]; } void ip6_ethernet_mac_address_from_link_local_address (u8 * mac, ip6_address_t * ip) { /* Invert the previously inverted "u" bit */ mac[0] = ip->as_u8[8] ^ (1 << 1); mac[1] = ip->as_u8[9]; mac[2] = ip->as_u8[10]; mac[3] = ip->as_u8[13]; mac[4] = ip->as_u8[14]; mac[5] = ip->as_u8[15]; } static clib_error_t * test_ip6_link_command_fn (vlib_main_t * vm, unformat_input_t * input, vlib_cli_command_t * cmd) { u8 mac[6]; ip6_address_t _a, *a = &_a; if (unformat (input, "%U", unformat_ethernet_address, mac)) { ip6_link_local_address_from_ethernet_mac_address (a, mac); vlib_cli_output (vm, "Link local address: %U", format_ip6_address, a); ip6_ethernet_mac_address_from_link_local_address (mac, a); vlib_cli_output (vm, "Original MAC address: %U", format_ethernet_address, mac); } return 0; } /*? * This command converts the given MAC Address into an IPv6 link-local * address. * * @cliexpar * Example of how to create an IPv6 link-local address: * @cliexstart{test ip6 link 16:d9:e0:91:79:86} * Link local address: fe80::14d9:e0ff:fe91:7986 * Original MAC address: 16:d9:e0:91:79:86 * @cliexend ?*/ /* *INDENT-OFF* */ VLIB_CLI_COMMAND (test_link_command, static) = { .path = "test ip6 link", .function = test_ip6_link_command_fn, .short_help = "test ip6 link <mac-address>", }; /* *INDENT-ON* */ int vnet_set_ip6_flow_hash (u32 table_id, u32 flow_hash_config) { u32 fib_index; fib_index = fib_table_find (FIB_PROTOCOL_IP6, table_id); if (~0 == fib_index) return VNET_API_ERROR_NO_SUCH_FIB; fib_table_set_flow_hash_config (fib_index, FIB_PROTOCOL_IP6, flow_hash_config); return 0; } static clib_error_t * set_ip6_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_ip6_flow_hash (table_id, flow_hash_config); switch (rv) { case 0: break; case -1: 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 IPv6 fields used by the flow hash. * * @cliexpar * @parblock * Example of how to set the flow hash on a given table: * @cliexcmd{set ip6 flow-hash table 8 dst sport dport proto} * * Example of display the configured flow hash: * @cliexstart{show ip6 fib} * ipv6-VRF:0, fib_index 0, flow hash: src dst sport dport proto * @::/0 * unicast-ip6-chain * [@0]: dpo-load-balance: [index:5 buckets:1 uRPF:5 to:[0:0]] * [0] [@0]: dpo-drop ip6 * fe80::/10 * unicast-ip6-chain * [@0]: dpo-load-balance: [index:10 buckets:1 uRPF:10 to:[0:0]] * [0] [@2]: dpo-receive * ff02::1/128 * unicast-ip6-chain * [@0]: dpo-load-balance: [index:8 buckets:1 uRPF:8 to:[0:0]] * [0] [@2]: dpo-receive * ff02::2/128 * unicast-ip6-chain * [@0]: dpo-load-balance: [index:7 buckets:1 uRPF:7 to:[0:0]] * [0] [@2]: dpo-receive * ff02::16/128 * unicast-ip6-chain * [@0]: dpo-load-balance: [index:9 buckets:1 uRPF:9 to:[0:0]] * [0] [@2]: dpo-receive * ff02::1:ff00:0/104 * unicast-ip6-chain * [@0]: dpo-load-balance: [index:6 buckets:1 uRPF:6 to:[0:0]] * [0] [@2]: dpo-receive * ipv6-VRF:8, fib_index 1, flow hash: dst sport dport proto * @::/0 * unicast-ip6-chain * [@0]: dpo-load-balance: [index:21 buckets:1 uRPF:20 to:[0:0]] * [0] [@0]: dpo-drop ip6 * @::a:1:1:0:4/126 * unicast-ip6-chain * [@0]: dpo-load-balance: [index:27 buckets:1 uRPF:26 to:[0:0]] * [0] [@4]: ipv6-glean: af_packet0 * @::a:1:1:0:7/128 * unicast-ip6-chain * [@0]: dpo-load-balance: [index:28 buckets:1 uRPF:27 to:[0:0]] * [0] [@2]: dpo-receive: @::a:1:1:0:7 on af_packet0 * fe80::/10 * unicast-ip6-chain * [@0]: dpo-load-balance: [index:26 buckets:1 uRPF:25 to:[0:0]] * [0] [@2]: dpo-receive * fe80::fe:3eff:fe3e:9222/128 * unicast-ip6-chain * [@0]: dpo-load-balance: [index:29 buckets:1 uRPF:28 to:[0:0]] * [0] [@2]: dpo-receive: fe80::fe:3eff:fe3e:9222 on af_packet0 * ff02::1/128 * unicast-ip6-chain * [@0]: dpo-load-balance: [index:24 buckets:1 uRPF:23 to:[0:0]] * [0] [@2]: dpo-receive * ff02::2/128 * unicast-ip6-chain * [@0]: dpo-load-balance: [index:23 buckets:1 uRPF:22 to:[0:0]] * [0] [@2]: dpo-receive * ff02::16/128 * unicast-ip6-chain * [@0]: dpo-load-balance: [index:25 buckets:1 uRPF:24 to:[0:0]] * [0] [@2]: dpo-receive * ff02::1:ff00:0/104 * unicast-ip6-chain * [@0]: dpo-load-balance: [index:22 buckets:1 uRPF:21 to:[0:0]] * [0] [@2]: dpo-receive * @cliexend * @endparblock ?*/ /* *INDENT-OFF* */ VLIB_CLI_COMMAND (set_ip6_flow_hash_command, static) = { .path = "set ip6 flow-hash", .short_help = "set ip6 flow-hash table <table-id> [src] [dst] [sport] [dport] [proto] [reverse]", .function = set_ip6_flow_hash_command_fn, }; /* *INDENT-ON* */ static clib_error_t * show_ip6_local_command_fn (vlib_main_t * vm, unformat_input_t * input, vlib_cli_command_t * cmd) { ip6_main_t *im = &ip6_main; ip_lookup_main_t *lm = &im->lookup_main; int i; vlib_cli_output (vm, "Protocols handled by ip6_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, ip6_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 IPv6 stack. * * @cliexpar * Example of how to display local protocol table: * @cliexstart{show ip6 local} * Protocols handled by ip6_local * 17 * 43 * 58 * 115 * @cliexend ?*/ /* *INDENT-OFF* */ VLIB_CLI_COMMAND (show_ip6_local, static) = { .path = "show ip6 local", .function = show_ip6_local_command_fn, .short_help = "show ip6 local", }; /* *INDENT-ON* */ int vnet_set_ip6_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; ip6_main_t *ipm = &ip6_main; ip_lookup_main_t *lm = &ipm->lookup_main; vnet_classify_main_t *cm = &vnet_classify_main; ip6_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 = ip6_interface_first_address (ipm, sw_if_index); if (NULL != if_addr) { fib_prefix_t pfx = { .fp_len = 128, .fp_proto = FIB_PROTOCOL_IP6, .fp_addr.ip6 = *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_IP6, classify_dpo_create (DPO_PROTO_IP6, 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; } static clib_error_t * set_ip6_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_ip6_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 ip6 classify intfc GigabitEthernet2/0/0 table-index 1} ?*/ /* *INDENT-OFF* */ VLIB_CLI_COMMAND (set_ip6_classify_command, static) = { .path = "set ip6 classify", .short_help = "set ip6 classify intfc <interface> table-index <classify-idx>", .function = set_ip6_classify_command_fn, }; /* *INDENT-ON* */ static clib_error_t * ip6_config (vlib_main_t * vm, unformat_input_t * input) { ip6_main_t *im = &ip6_main; uword heapsize = 0; u32 tmp; u32 nbuckets = 0; while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT) { if (unformat (input, "hash-buckets %d", &tmp)) nbuckets = tmp; else if (unformat (input, "heap-size %dm", &tmp)) heapsize = ((u64) tmp) << 20; else if (unformat (input, "heap-size %dM", &tmp)) heapsize = ((u64) tmp) << 20; else if (unformat (input, "heap-size %dg", &tmp)) heapsize = ((u64) tmp) << 30; else if (unformat (input, "heap-size %dG", &tmp)) heapsize = ((u64) tmp) << 30; else return clib_error_return (0, "unknown input '%U'", format_unformat_error, input); } im->lookup_table_nbuckets = nbuckets; im->lookup_table_size = heapsize; return 0; } VLIB_EARLY_CONFIG_FUNCTION (ip6_config, "ip6"); /* * fd.io coding-style-patch-verification: ON * * Local Variables: * eval: (c-set-style "gnu") * End: */