/* * ipsec_if_in.c : IPSec interface input node * * Copyright (c) 2015 Cisco and/or its affiliates. * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at: * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ #include #include #include #include #include #include /* Statistics (not really errors) */ #define foreach_ipsec_if_input_error \ _(RX, "good packets received") \ _(DISABLED, "ipsec packets received on disabled interface") \ _(NO_TUNNEL, "no matching tunnel") static char *ipsec_if_input_error_strings[] = { #define _(sym,string) string, foreach_ipsec_if_input_error #undef _ }; typedef enum { #define _(sym,str) IPSEC_IF_INPUT_ERROR_##sym, foreach_ipsec_if_input_error #undef _ IPSEC_IF_INPUT_N_ERROR, } ipsec_if_input_error_t; typedef struct { u32 spi; u32 seq; } ipsec_if_input_trace_t; static u8 * format_ipsec_if_input_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 *); ipsec_if_input_trace_t *t = va_arg (*args, ipsec_if_input_trace_t *); s = format (s, "IPSec: spi %u seq %u", t->spi, t->seq); return s; } VLIB_NODE_FN (ipsec_if_input_node) (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * from_frame) { ipsec_main_t *im = &ipsec_main; vnet_main_t *vnm = im->vnet_main; vnet_interface_main_t *vim = &vnm->interface_main; u32 *from, *to_next = 0, next_index; u32 n_left_from, last_sw_if_index = ~0; u32 thread_index = vm->thread_index; u64 n_bytes = 0, n_packets = 0; const ipsec_tunnel_if_t *last_t = NULL; vlib_combined_counter_main_t *rx_counter; vlib_combined_counter_main_t *drop_counter; u32 n_disabled = 0, n_no_tunnel = 0; rx_counter = vim->combined_sw_if_counters + VNET_INTERFACE_COUNTER_RX; drop_counter = vim->combined_sw_if_counters + VNET_INTERFACE_COUNTER_DROP; from = vlib_frame_vector_args (from_frame); n_left_from = 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, next0, next1, sw_if_index0, sw_if_index1; const esp_header_t *esp0, *esp1; const ip4_header_t *ip0, *ip1; vlib_buffer_t *b0, *b1; uword *p0, *p1; u32 len0, len1; u64 key0, key1; /* 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); } bi0 = to_next[0] = from[0]; bi1 = to_next[1] = from[1]; from += 2; n_left_from -= 2; to_next += 2; n_left_to_next -= 2; next0 = next1 = IPSEC_INPUT_NEXT_DROP; b0 = vlib_get_buffer (vm, bi0); b1 = vlib_get_buffer (vm, bi1); ip0 = vlib_buffer_get_current (b0); ip1 = vlib_buffer_get_current (b1); esp0 = (const esp_header_t *) ((u8 *) ip0 + ip4_header_bytes (ip0)); esp1 = (const esp_header_t *) ((u8 *) ip1 + ip4_header_bytes (ip1)); key0 = (u64) ip0->src_address.as_u32 << 32 | (u64) esp0->spi; key1 = (u64) ip1->src_address.as_u32 << 32 | (u64) esp1->spi; p0 = hash_get (im->ipsec_if_pool_index_by_key, key0); p1 = hash_get (im->ipsec_if_pool_index_by_key, key1); /* stats for the tunnel include all the data after the IP header just like a norml IP-IP tunnel */ vlib_buffer_advance (b0, ip4_header_bytes (ip0)); vlib_buffer_advance (b1, ip4_header_bytes (ip1)); len0 = vlib_buffer_length_in_chain (vm, b0); len1 = vlib_buffer_length_in_chain (vm, b1); if (PREDICT_TRUE (NULL != p0)) { const ipsec_tunnel_if_t *t0; t0 = pool_elt_at_index (im->tunnel_interfaces, p0[0]); vnet_buffer (b0)->ipsec.sad_index = t0->input_sa_index; if (PREDICT_TRUE (t0->hw_if_index != ~0)) { vnet_buffer (b0)->ipsec.flags = 0; sw_if_index0 = t0->sw_if_index; vnet_buffer (b0)->sw_if_index[VLIB_RX] = sw_if_index0; if (PREDICT_FALSE (!(t0->flags & VNET_HW_INTERFACE_FLAG_LINK_UP))) { vlib_increment_combined_counter (drop_counter, thread_index, sw_if_index0, 1, len0); b0->error = node->errors[IPSEC_IF_INPUT_ERROR_DISABLED]; n_disabled++; goto pkt1; } if (PREDICT_TRUE (sw_if_index0 == last_sw_if_index)) { n_packets++; n_bytes += len0; } else { if (last_t) { vlib_increment_combined_counter (rx_counter, thread_index, sw_if_index0, n_packets, n_bytes); } last_sw_if_index = sw_if_index0; last_t = t0; n_packets = 1; n_bytes = len0; } } else { vnet_buffer (b0)->ipsec.flags = IPSEC_FLAG_IPSEC_GRE_TUNNEL; } next0 = im->esp4_decrypt_next_index; } else { b0->error = node->errors[IPSEC_IF_INPUT_ERROR_NO_TUNNEL]; n_no_tu