diff options
Diffstat (limited to 'src/vnet/ipsec/ipsec_if_in.c')
| -rw-r--r-- | src/vnet/ipsec/ipsec_if_in.c | 221 |
1 files changed, 221 insertions, 0 deletions
diff --git a/src/vnet/ipsec/ipsec_if_in.c b/src/vnet/ipsec/ipsec_if_in.c new file mode 100644 index 00000000..b0761224 --- /dev/null +++ b/src/vnet/ipsec/ipsec_if_in.c @@ -0,0 +1,221 @@ +/* + * 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 <vnet/vnet.h> +#include <vnet/api_errno.h> +#include <vnet/ip/ip.h> + +#include <vnet/ipsec/ipsec.h> +#include <vnet/ipsec/esp.h> + +/* Statistics (not really errors) */ +#define foreach_ipsec_if_input_error \ +_(RX, "good packets received") + +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; +} + +static uword +ipsec_if_input_node_fn (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; + esp_main_t *em = &esp_main; + u32 *from, *to_next = 0, next_index; + u32 n_left_from, last_sw_if_index = ~0; + u32 thread_index = vlib_get_thread_index (); + u64 n_bytes = 0, n_packets = 0; + u8 icv_len; + ipsec_tunnel_if_t *last_t = NULL; + ipsec_sa_t *sa0; + + 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; + + 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); + + 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_TRUE (sw_if_index0 == last_sw_if_index)) + { + n_packets++; + n_bytes += vlib_buffer_length_in_chain (vm, b0); + } + else + { + sa0 = pool_elt_at_index (im->sad, t->input_sa_index); + icv_len = em->esp_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 + (vim->combined_sw_if_counters + + VNET_INTERFACE_COUNTER_RX, + thread_index, sw_if_index0, n_packets, n_bytes); + } + + last_sw_if_index = sw_if_index0; + last_t = t; + n_packets = 1; + n_bytes = vlib_buffer_length_in_chain (vm, b0); + } + } + else + { + vnet_buffer (b0)->ipsec.flags = IPSEC_FLAG_IPSEC_GRE_TUNNEL; + } + + vlib_buffer_advance (b0, ip4_header_bytes (ip0)); + next0 = im->esp_decrypt_next_index; + } + + 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->esp_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 (vim->combined_sw_if_counters + + VNET_INTERFACE_COUNTER_RX, + 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); + + return from_frame->n_vectors; +} + +/* *INDENT-OFF* */ +VLIB_REGISTER_NODE (ipsec_if_input_node) = { + .function = ipsec_if_input_node_fn, + .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 = "ipsec-input-ip4", +}; +/* *INDENT-ON* */ + +VLIB_NODE_FUNCTION_MULTIARCH (ipsec_if_input_node, ipsec_if_input_node_fn) +/* + * fd.io coding-style-patch-verification: ON + * + * Local Variables: + * eval: (c-set-style "gnu") + * End: + */ |