/* * 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 /* Statistics (not really errors) */ #define foreach_ipsec_if_input_error \ _(RX, "good packets received") \ _(DISABLED, "ipsec packets received on disabled interface") 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; 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; ipsec_proto_main_t *em = &ipsec_proto_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; u8 icv_len; ipsec_tunnel_if_t *last_t = NULL; ipsec_sa_t *sa0; vlib_combined_counter_main_t *rx_counter; vlib_combined_counter_main_t *drop_counter; u32 n_disabled = 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 > 0 && n_left_to_next > 0) { u32 bi0, next0, sw_if_index0; vlib_buffer_t *b0; ip4_header_t *ip0; esp_header_t *esp0; uword *p; u32 len0; bi0 = to_next[0] = from[0]; from += 1; n_left_from -= 1; to_next += 1; n_left_to_next -= 1; b0 = vlib_get_buffer (vm, bi0); ip0 = vlib_buffer_get_current (b0); esp0 = (esp_header_t *) ((u8 *) ip0 + ip4_header_bytes (ip0)); next0 = IPSEC_INPUT_NEXT_DROP; u64 key = (u64) ip0->src_address.as_u32 << 32 | (u64) clib_net_to_host_u32 (esp0->spi); p = hash_get (im->ipsec_if_pool_index_by_key, key); len0 = vlib_buffer_length_in_chain (vm, b0); if (p) { ipsec_tunnel_if_t *t; t = pool_elt_at_index (im->tunnel_interfaces, p[0]); vnet_buffer (b0)->ipsec.sad_index = t->input_sa_index; if (t->hw_if_index != ~0) { vnet_hw_interface_t *hi; vnet_buffer (b0)->ipsec.flags = 0; hi = vnet_get_hw_interface (vnm, t->hw_if_index); sw_if_index0 = hi->sw_if_index; vnet_buffer (b0)->sw_if_index[VLIB_RX] = sw_if_index0; if (PREDICT_FALSE (!(hi->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 trace; } if (PREDICT_TRUE (sw_if_index0 == last_sw_if_index)) { n_packets++; n_bytes += len0; } else { sa0 = pool_elt_at_index (im->sad, t->input_sa_index); icv_len = em->ipsec_proto_main_integ_algs[sa0-> integ_alg].trunc_size; /* length = packet length - ESP/tunnel overhead */ n_bytes -= n_packets * (sizeof (ip4_header_t) + sizeof (esp_header_t) + sizeof (esp_footer_t) + 16 /* aes-cbc IV */ + icv_len); 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 = t; n_packets = 1; n_bytes = len0; } } else { vnet_buffer (b0)->ipsec.flags = IPSEC_FLAG_IPSEC_GRE_TUNNEL; } vlib_buffer_advance (b0, ip4_header_bytes (ip0)); next0 = im->esp4_decrypt_next_index; } trace: if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED)) { ipsec_if_input_trace_t *tr = vlib_add_trace (vm, node, b0, sizeof (*tr)); tr->spi = clib_host_to_net_u32 (esp0->spi); tr->seq = clib_host_to_net_u32 (esp0->seq); } vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next, n_left_to_next, bi0, next0); } vlib_put_next_frame (vm, node, next_index, n_left_to_next); } if (last_t) { sa0 = pool_elt_at_index (im->sad, last_t->input_sa_index); icv_len = em->ipsec_proto_main_integ_algs[sa0->integ_alg].trunc_size; n_bytes -= n_packets * (sizeof (ip4_header_t) + sizeof (esp_header_t) + sizeof (esp_footer_t) + 16 /* aes-cbc IV */ + icv_len); vlib_increment_combined_counter (rx_counter, thread_index, last_sw_if_index, n_packets, n_bytes); } vlib_node_increment_counter (vm, ipsec_if_input_node.index, IPSEC_IF_INPUT_ERROR_RX, from_frame->n_vectors - n_disabled); vlib_node_increment_counter (vm, ipsec_if_input_node.index, IPSEC_IF_INPUT_ERROR_DISABLED, n_disabled); return from_frame->n_vectors; } /* *INDENT-OFF* */ VLIB_REGISTER_NODE (ipsec_if_input_node) = { .name = "ipsec-if-input", .vector_size = sizeof (u32), .format_trace = format_ipsec_if_input_trace, .type = VLIB_NODE_TYPE_INTERNAL, .n_errors = ARRAY_LEN(ipsec_if_input_error_strings), .error_strings = ipsec_if_input_error_strings, .sibling_of = "ipsec4-input", }; /* *INDENT-ON* */ /* * fd.io coding-style-patch-verification: ON * * Local Variables: * eval: (c-set-style "gnu") * End: */