diff options
Diffstat (limited to 'src/plugins/odp/ipsec/esp_decrypt_ipsec_api.c')
| -rw-r--r-- | src/plugins/odp/ipsec/esp_decrypt_ipsec_api.c | 262 |
1 files changed, 262 insertions, 0 deletions
diff --git a/src/plugins/odp/ipsec/esp_decrypt_ipsec_api.c b/src/plugins/odp/ipsec/esp_decrypt_ipsec_api.c new file mode 100644 index 00000000..aa9eeec9 --- /dev/null +++ b/src/plugins/odp/ipsec/esp_decrypt_ipsec_api.c @@ -0,0 +1,262 @@ +/* + * esp_decrypt.c : IPSec ESP decrypt 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 <odp/ipsec/ipsec.h> +#include <odp/ipsec/esp.h> +#include <odp/odp_packet.h> + +#include <assert.h> + +#define foreach_esp_decrypt_next \ +_(DROP, "error-drop") \ +_(IP4_INPUT, "ip4-input") \ +_(IP6_INPUT, "ip6-input") + +#define _(v, s) ESP_DECRYPT_NEXT_##v, +typedef enum +{ + foreach_esp_decrypt_next +#undef _ + ESP_DECRYPT_N_NEXT, +} esp_decrypt_next_t; + + +#define foreach_esp_decrypt_error \ + _(RX_PKTS, "ESP pkts received") \ + _(NO_BUFFER, "No buffer (packed dropped)") \ + _(DECRYPTION_FAILED, "ESP decryption failed") \ + _(INTEG_ERROR, "Integrity check failed") \ + _(REPLAY, "SA replayed packet") \ + _(NOT_IP, "Not IP packet (dropped)") + + +typedef enum +{ +#define _(sym,str) ESP_DECRYPT_ERROR_##sym, + foreach_esp_decrypt_error +#undef _ + ESP_DECRYPT_N_ERROR, +} esp_decrypt_error_t; + +static char *esp_decrypt_error_strings[] = { +#define _(sym,string) string, + foreach_esp_decrypt_error +#undef _ +}; + +typedef struct +{ + ipsec_crypto_alg_t crypto_alg; + ipsec_integ_alg_t integ_alg; +} esp_decrypt_trace_t; + +vlib_node_registration_t odp_ipsec_esp_decrypt_node; +vlib_node_registration_t odp_ipsec_esp_decrypt_post_node; + +/* packet trace format function */ +static u8 * +format_esp_decrypt_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 *); + esp_decrypt_trace_t *t = va_arg (*args, esp_decrypt_trace_t *); + + s = format (s, "(ODP IPsec API) esp: crypto %U integrity %U", + format_ipsec_crypto_alg, t->crypto_alg, + format_ipsec_integ_alg, t->integ_alg); + return s; +} + +static uword +esp_decrypt_node_fn (vlib_main_t * vm, + vlib_node_runtime_t * node, vlib_frame_t * from_frame) +{ + u32 n_left_from, *from, next_index, *to_next; + ipsec_main_t *im = &ipsec_main; + from = vlib_frame_vector_args (from_frame); + n_left_from = from_frame->n_vectors; + odp_crypto_main_t *ocm = &odp_crypto_main; + u32 thread_index = vlib_get_thread_index (); + + ipsec_alloc_empty_buffers (vm, im); + + u32 *empty_buffers = im->empty_buffers[thread_index]; + + odp_crypto_worker_main_t *cwm = + vec_elt_at_index (ocm->workers, thread_index); + + if (PREDICT_FALSE (vec_len (empty_buffers) < n_left_from)) + { + vlib_node_increment_counter (vm, odp_ipsec_esp_decrypt_node.index, + ESP_DECRYPT_ERROR_NO_BUFFER, n_left_from); + goto free_buffers_and_exit; + } + + next_index = node->cached_next_index; + + while (n_left_from > 0) + { + u32 n_left_to_next; + u32 buffers_passed = 0; + + 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; + vlib_buffer_t *i_b0, *o_b0; + ipsec_sa_t *sa0; + u32 sa_index0 = ~0; + sa_data_t *sa_sess_data; + u8 ip_hdr_size = sizeof (ip4_header_t); + ip4_header_t *ih4 = 0; + + bi0 = from[0]; + from += 1; + n_left_from -= 1; + n_left_to_next -= 1; + + next0 = ESP_DECRYPT_NEXT_DROP; + + i_b0 = vlib_get_buffer (vm, bi0); + + sa_index0 = vnet_buffer (i_b0)->ipsec.sad_index; + sa0 = pool_elt_at_index (im->sad, sa_index0); + + ih4 = (ip4_header_t *) (i_b0->data + sizeof (ethernet_header_t)); + if (PREDICT_TRUE + ((ih4->ip_version_and_header_length & 0xF0) != 0x40)) + { + ip_hdr_size = sizeof (ip6_header_t); + } + + sa0->total_data_size += i_b0->current_length; + + sa_sess_data = pool_elt_at_index (cwm->sa_sess_d[0], sa_index0); + if (PREDICT_FALSE (!(sa_sess_data->is_odp_sa_present))) + { + int ret = create_odp_sa (sa0, sa_sess_data, 0, 0); + + if (ret) + { + to_next[0] = bi0; + to_next += 1; + goto trace; + } + } + + if (ip_hdr_size == sizeof (ip6_header_t)) + next0 = ESP_DECRYPT_NEXT_IP6_INPUT; + else + next0 = ESP_DECRYPT_NEXT_IP4_INPUT; + + odp_packet_t pkt = odp_packet_from_vlib_buffer (i_b0); + odp_packet_t out_pkt; + + odp_ipsec_in_param_t oiopt; + oiopt.num_sa = 1; + oiopt.sa = &sa_sess_data->odp_sa; + + odp_packet_l3_offset_set (pkt, i_b0->current_data - ip_hdr_size); + + to_next[0] = bi0; + to_next += 1; + + int processed = 1; + + int ret = odp_ipsec_in (&pkt, 1, &out_pkt, &processed, &oiopt); + + o_b0 = vlib_buffer_from_odp_packet (out_pkt); + + if (ret < 1) + { + clib_error ("(in) IPsec packet not processed\n"); + goto trace; + } + + /* add the change of the ODP data offset + and the offset to IP within the packet data */ + o_b0->current_data = + (i16) ((intptr_t) odp_packet_data (out_pkt) - + (intptr_t) o_b0->data + + (intptr_t) odp_packet_l3_offset (out_pkt)); + o_b0->current_length = + odp_packet_len (out_pkt) - sizeof (ethernet_header_t); + + vnet_buffer (o_b0)->sw_if_index[VLIB_TX] = (u32) ~ 0; + + vnet_buffer (o_b0)->unused[0] = next0; + + trace: + if (PREDICT_FALSE (o_b0->flags & VLIB_BUFFER_IS_TRACED)) + { + o_b0->flags |= VLIB_BUFFER_IS_TRACED; + o_b0->trace_index = o_b0->trace_index; + esp_decrypt_trace_t *tr = + vlib_add_trace (vm, node, o_b0, sizeof (*tr)); + tr->crypto_alg = sa0->crypto_alg; + tr->integ_alg = sa0->integ_alg; + } + + vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next, + n_left_to_next, bi0, next0); + buffers_passed += 1; + } + if (buffers_passed > 0) + vlib_put_next_frame (vm, node, next_index, n_left_to_next); + } + vlib_node_increment_counter (vm, odp_ipsec_esp_decrypt_node.index, + ESP_DECRYPT_ERROR_RX_PKTS, + from_frame->n_vectors); + +free_buffers_and_exit: + return from_frame->n_vectors; +} + + +/* *INDENT-OFF* */ +VLIB_REGISTER_NODE (odp_ipsec_esp_decrypt_node) = { + .function = esp_decrypt_node_fn, + .name = "odp-ipsec-esp-decrypt", + .vector_size = sizeof (u32), + .format_trace = format_esp_decrypt_trace, + .type = VLIB_NODE_TYPE_INTERNAL, + + .n_errors = ARRAY_LEN(esp_decrypt_error_strings), + .error_strings = esp_decrypt_error_strings, + + .n_next_nodes = ESP_DECRYPT_N_NEXT, + .next_nodes = { +#define _(s,n) [ESP_DECRYPT_NEXT_##s] = n, + foreach_esp_decrypt_next +#undef _ + }, +}; + +/* *INDENT-ON* */ + +/* + * fd.io coding-style-patch-verification: ON + * + * Local Variables: + * eval: (c-set-style "gnu") + * End: + */ |