diff options
Diffstat (limited to 'src/plugins/dpdk/ipsec/esp_decrypt.c')
| -rw-r--r-- | src/plugins/dpdk/ipsec/esp_decrypt.c | 569 |
1 files changed, 569 insertions, 0 deletions
diff --git a/src/plugins/dpdk/ipsec/esp_decrypt.c b/src/plugins/dpdk/ipsec/esp_decrypt.c new file mode 100644 index 00000000..20936b36 --- /dev/null +++ b/src/plugins/dpdk/ipsec/esp_decrypt.c @@ -0,0 +1,569 @@ +/* + * esp_decrypt.c : IPSec ESP Decrypt node using DPDK Cryptodev + * + * Copyright (c) 2016 Intel 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 <dpdk/ipsec/ipsec.h> +#include <dpdk/ipsec/esp.h> +#include <dpdk/device/dpdk.h> +#include <dpdk/device/dpdk_priv.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") \ + _(DECRYPTION_FAILED, "ESP decryption failed") \ + _(REPLAY, "SA replayed packet") \ + _(NOT_IP, "Not IP packet (dropped)") \ + _(ENQ_FAIL, "Enqueue failed (buffer full)") \ + _(NO_CRYPTODEV, "Cryptodev not configured") \ + _(BAD_LEN, "Invalid ciphertext length") + + +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 _ +}; + +vlib_node_registration_t dpdk_esp_decrypt_node; + +typedef struct { + ipsec_crypto_alg_t crypto_alg; + ipsec_integ_alg_t integ_alg; +} esp_decrypt_trace_t; + +/* 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, "esp: crypto %U integrity %U", + format_ipsec_crypto_alg, t->crypto_alg, + format_ipsec_integ_alg, t->integ_alg); + return s; +} + +static uword +dpdk_esp_decrypt_node_fn (vlib_main_t * vm, + vlib_node_runtime_t * node, + vlib_frame_t * from_frame) +{ + u32 n_left_from, *from, *to_next, next_index; + ipsec_main_t *im = &ipsec_main; + u32 thread_index = vlib_get_thread_index(); + dpdk_crypto_main_t * dcm = &dpdk_crypto_main; + dpdk_esp_main_t * em = &dpdk_esp_main; + u32 i; + + from = vlib_frame_vector_args (from_frame); + n_left_from = from_frame->n_vectors; + + crypto_worker_main_t *cwm = + vec_elt_at_index(dcm->workers_main, thread_index); + u32 n_qps = vec_len(cwm->qp_data); + struct rte_crypto_op ** cops_to_enq[n_qps]; + u32 n_cop_qp[n_qps], * bi_to_enq[n_qps]; + + for (i = 0; i < n_qps; i++) + { + bi_to_enq[i] = cwm->qp_data[i].bi; + cops_to_enq[i] = cwm->qp_data[i].cops; + } + + memset(n_cop_qp, 0, n_qps * sizeof(u32)); + + crypto_alloc_cops(); + + next_index = ESP_DECRYPT_NEXT_DROP; + + 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, sa_index0 = ~0, seq, trunc_size, iv_size; + vlib_buffer_t * b0; + esp_header_t * esp0; + ipsec_sa_t * sa0; + struct rte_mbuf * mb0 = 0; + const int BLOCK_SIZE = 16; + crypto_sa_session_t * sa_sess; + void * sess; + u16 qp_index; + struct rte_crypto_op * cop = 0; + + bi0 = from[0]; + from += 1; + n_left_from -= 1; + + b0 = vlib_get_buffer (vm, bi0); + esp0 = vlib_buffer_get_current (b0); + + sa_index0 = vnet_buffer(b0)->ipsec.sad_index; + sa0 = pool_elt_at_index (im->sad, sa_index0); + + seq = clib_host_to_net_u32(esp0->seq); + + /* anti-replay check */ + if (sa0->use_anti_replay) + { + int rv = 0; + + if (PREDICT_TRUE(sa0->use_esn)) + rv = esp_replay_check_esn(sa0, seq); + else + rv = esp_replay_check(sa0, seq); + + if (PREDICT_FALSE(rv)) + { + clib_warning ("anti-replay SPI %u seq %u", sa0->spi, seq); + vlib_node_increment_counter (vm, dpdk_esp_decrypt_node.index, + ESP_DECRYPT_ERROR_REPLAY, 1); + to_next[0] = bi0; + to_next += 1; + n_left_to_next -= 1; + goto trace; + } + } + + sa0->total_data_size += b0->current_length; + + sa_sess = pool_elt_at_index(cwm->sa_sess_d[0], sa_index0); + + if (PREDICT_FALSE(!sa_sess->sess)) + { + int ret = create_sym_sess(sa0, sa_sess, 0); + + if (PREDICT_FALSE (ret)) + { + to_next[0] = bi0; + to_next += 1; + n_left_to_next -= 1; + goto trace; + } + } + + sess = sa_sess->sess; + qp_index = sa_sess->qp_index; + + ASSERT (vec_len (vec_elt (cwm->qp_data, qp_index).free_cops) > 0); + cop = vec_pop (vec_elt (cwm->qp_data, qp_index).free_cops); + ASSERT (cop->status == RTE_CRYPTO_OP_STATUS_NOT_PROCESSED); + + cops_to_enq[qp_index][0] = cop; + cops_to_enq[qp_index] += 1; + n_cop_qp[qp_index] += 1; + bi_to_enq[qp_index][0] = bi0; + bi_to_enq[qp_index] += 1; + + rte_crypto_op_attach_sym_session(cop, sess); + + if (sa0->crypto_alg == IPSEC_CRYPTO_ALG_AES_GCM_128) + trunc_size = 16; + else + trunc_size = em->esp_integ_algs[sa0->integ_alg].trunc_size; + iv_size = em->esp_crypto_algs[sa0->crypto_alg].iv_len; + + /* Convert vlib buffer to mbuf */ + mb0 = rte_mbuf_from_vlib_buffer(b0); + mb0->data_len = b0->current_length; + mb0->pkt_len = b0->current_length; + mb0->data_off = RTE_PKTMBUF_HEADROOM + b0->current_data; + + /* Outer IP header has already been stripped */ + u16 payload_len = rte_pktmbuf_pkt_len(mb0) - sizeof (esp_header_t) - + iv_size - trunc_size; + + if ((payload_len & (BLOCK_SIZE - 1)) || (payload_len <= 0)) + { + clib_warning ("payload %u not multiple of %d\n", + payload_len, BLOCK_SIZE); + vlib_node_increment_counter (vm, dpdk_esp_decrypt_node.index, + ESP_DECRYPT_ERROR_BAD_LEN, 1); + vec_add (vec_elt (cwm->qp_data, qp_index).free_cops, &cop, 1); + bi_to_enq[qp_index] -= 1; + cops_to_enq[qp_index] -= 1; + n_cop_qp[qp_index] -= 1; + to_next[0] = bi0; + to_next += 1; + n_left_to_next -= 1; + goto trace; + } + + struct rte_crypto_sym_op *sym_cop = (struct rte_crypto_sym_op *)(cop + 1); + + u8 is_aead = sa0->crypto_alg == IPSEC_CRYPTO_ALG_AES_GCM_128; + u32 cipher_off, cipher_len; + u32 auth_off = 0, auth_len = 0, aad_size = 0; + u8 *aad = NULL, *digest = NULL; + u64 digest_paddr; + + u8 *iv = rte_pktmbuf_mtod_offset(mb0, void*, sizeof (esp_header_t)); + dpdk_cop_priv_t *priv = (dpdk_cop_priv_t *)(sym_cop + 1); + dpdk_gcm_cnt_blk *icb = &priv->cb; + + cipher_off = sizeof (esp_header_t) + iv_size; + cipher_len = payload_len; + + digest = + vlib_buffer_get_current (b0) + sizeof(esp_header_t) + + iv_size + payload_len; + + digest_paddr = mb0->buf_physaddr + (digest - (u8 *) mb0->buf_addr); + + if (is_aead) + { + u32 *_iv = (u32 *) iv; + + crypto_set_icb (icb, sa0->salt, _iv[0], _iv[1]); + iv_size = 16; + + aad = priv->aad; + clib_memcpy(aad, esp0, 8); + aad_size = 8; + if (sa0->use_esn) + { + *((u32*)&aad[8]) = sa0->seq_hi; + aad_size = 12; + } + } + else + { + clib_memcpy(icb, iv, 16); + + auth_off = 0; + auth_len = sizeof(esp_header_t) + iv_size + payload_len; + + if (sa0->use_esn) + { + dpdk_cop_priv_t* priv = (dpdk_cop_priv_t*) (sym_cop + 1); + + clib_memcpy (priv->icv, digest, trunc_size); + *((u32*) digest) = sa0->seq_hi; + auth_len += sizeof(sa0->seq_hi); + + digest = priv->icv; + digest_paddr = + cop->phys_addr + (uintptr_t) priv->icv - (uintptr_t) cop; + } + } + + crypto_op_setup (is_aead, mb0, cop, sess, + cipher_off, cipher_len, (u8 *) icb, iv_size, + auth_off, auth_len, aad, aad_size, + digest, digest_paddr, trunc_size); +trace: + if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED)) + { + esp_decrypt_trace_t *tr = vlib_add_trace (vm, node, b0, sizeof (*tr)); + tr->crypto_alg = sa0->crypto_alg; + tr->integ_alg = sa0->integ_alg; + } + } + vlib_put_next_frame (vm, node, next_index, n_left_to_next); + } + vlib_node_increment_counter (vm, dpdk_esp_decrypt_node.index, + ESP_DECRYPT_ERROR_RX_PKTS, + from_frame->n_vectors); + crypto_qp_data_t *qpd; + /* *INDENT-OFF* */ + vec_foreach_index (i, cwm->qp_data) + { + u32 enq; + + if (!n_cop_qp[i]) + continue; + + qpd = vec_elt_at_index(cwm->qp_data, i); + enq = rte_cryptodev_enqueue_burst(qpd->dev_id, qpd->qp_id, + qpd->cops, n_cop_qp[i]); + qpd->inflights += enq; + + if (PREDICT_FALSE(enq < n_cop_qp[i])) + { + crypto_free_cop (qpd, &qpd->cops[enq], n_cop_qp[i] - enq); + vlib_buffer_free (vm, &qpd->bi[enq], n_cop_qp[i] - enq); + + vlib_node_increment_counter (vm, dpdk_esp_decrypt_node.index, + ESP_DECRYPT_ERROR_ENQ_FAIL, + n_cop_qp[i] - enq); + } + } + /* *INDENT-ON* */ + + return from_frame->n_vectors; +} + +/* *INDENT-OFF* */ +VLIB_REGISTER_NODE (dpdk_esp_decrypt_node) = { + .function = dpdk_esp_decrypt_node_fn, + .name = "dpdk-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* */ + +VLIB_NODE_FUNCTION_MULTIARCH (dpdk_esp_decrypt_node, dpdk_esp_decrypt_node_fn) + +/* + * Decrypt Post Node + */ + +#define foreach_esp_decrypt_post_error \ + _(PKTS, "ESP post pkts") + +typedef enum { +#define _(sym,str) ESP_DECRYPT_POST_ERROR_##sym, + foreach_esp_decrypt_post_error +#undef _ + ESP_DECRYPT_POST_N_ERROR, +} esp_decrypt_post_error_t; + +static char * esp_decrypt_post_error_strings[] = { +#define _(sym,string) string, + foreach_esp_decrypt_post_error +#undef _ +}; + +vlib_node_registration_t dpdk_esp_decrypt_post_node; + +static u8 * format_esp_decrypt_post_trace (u8 * s, va_list * args) +{ + return s; +} + +static uword +dpdk_esp_decrypt_post_node_fn (vlib_main_t * vm, + vlib_node_runtime_t * node, + vlib_frame_t * from_frame) +{ + u32 n_left_from, *from, *to_next = 0, next_index; + ipsec_sa_t * sa0; + u32 sa_index0 = ~0; + ipsec_main_t *im = &ipsec_main; + dpdk_esp_main_t *em = &dpdk_esp_main; + + 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) + { + esp_footer_t * f0; + u32 bi0, next0, trunc_size, iv_size; + vlib_buffer_t * b0 = 0; + ip4_header_t *ih4 = 0, *oh4 = 0; + ip6_header_t *ih6 = 0, *oh6 = 0; + u8 tunnel_mode = 1; + u8 transport_ip6 = 0; + + next0 = ESP_DECRYPT_NEXT_DROP; + + bi0 = from[0]; + from += 1; + n_left_from -= 1; + n_left_to_next -= 1; + + b0 = vlib_get_buffer (vm, bi0); + + sa_index0 = vnet_buffer(b0)->ipsec.sad_index; + sa0 = pool_elt_at_index (im->sad, sa_index0); + + to_next[0] = bi0; + to_next += 1; + + if (sa0->crypto_alg == IPSEC_CRYPTO_ALG_AES_GCM_128) + trunc_size = 16; + else + trunc_size = em->esp_integ_algs[sa0->integ_alg].trunc_size; + iv_size = em->esp_crypto_algs[sa0->crypto_alg].iv_len; + + if (sa0->use_anti_replay) + { + esp_header_t * esp0 = vlib_buffer_get_current (b0); + u32 seq; + seq = clib_host_to_net_u32(esp0->seq); + if (PREDICT_TRUE(sa0->use_esn)) + esp_replay_advance_esn(sa0, seq); + else + esp_replay_advance(sa0, seq); + } + + ih4 = (ip4_header_t *) (b0->data + sizeof(ethernet_header_t)); + vlib_buffer_advance (b0, sizeof (esp_header_t) + iv_size); + + b0->current_length -= (trunc_size + 2); + b0->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID; + f0 = (esp_footer_t *) ((u8 *) vlib_buffer_get_current (b0) + + b0->current_length); + b0->current_length -= f0->pad_length; + + /* transport mode */ + if (PREDICT_FALSE(!sa0->is_tunnel && !sa0->is_tunnel_ip6)) + { + tunnel_mode = 0; + + if (PREDICT_TRUE((ih4->ip_version_and_header_length & 0xF0) != 0x40)) + { + if (PREDICT_TRUE((ih4->ip_version_and_header_length & 0xF0) == 0x60)) + transport_ip6 = 1; + else + { + clib_warning("next header: 0x%x", f0->next_header); + vlib_node_increment_counter (vm, dpdk_esp_decrypt_node.index, + ESP_DECRYPT_ERROR_NOT_IP, 1); + goto trace; + } + } + } + + if (PREDICT_TRUE (tunnel_mode)) + { + if (PREDICT_TRUE(f0->next_header == IP_PROTOCOL_IP_IN_IP)) + next0 = ESP_DECRYPT_NEXT_IP4_INPUT; + else if (f0->next_header == IP_PROTOCOL_IPV6) + next0 = ESP_DECRYPT_NEXT_IP6_INPUT; + else + { + clib_warning("next header: 0x%x", f0->next_header); + vlib_node_increment_counter (vm, dpdk_esp_decrypt_node.index, + ESP_DECRYPT_ERROR_DECRYPTION_FAILED, + 1); + goto trace; + } + } + /* transport mode */ + else + { + if (PREDICT_FALSE(transport_ip6)) + { + ih6 = (ip6_header_t *) (b0->data + sizeof(ethernet_header_t)); + vlib_buffer_advance (b0, -sizeof(ip6_header_t)); + oh6 = vlib_buffer_get_current (b0); + memmove(oh6, ih6, sizeof(ip6_header_t)); + + next0 = ESP_DECRYPT_NEXT_IP6_INPUT; + oh6->protocol = f0->next_header; + oh6->payload_length = + clib_host_to_net_u16 ( + vlib_buffer_length_in_chain(vm, b0) - + sizeof (ip6_header_t)); + } + else + { + vlib_buffer_advance (b0, -sizeof(ip4_header_t)); + oh4 = vlib_buffer_get_current (b0); + memmove(oh4, ih4, sizeof(ip4_header_t)); + + next0 = ESP_DECRYPT_NEXT_IP4_INPUT; + oh4->ip_version_and_header_length = 0x45; + oh4->fragment_id = 0; + oh4->flags_and_fragment_offset = 0; + oh4->protocol = f0->next_header; + oh4->length = clib_host_to_net_u16 ( + vlib_buffer_length_in_chain (vm, b0)); + oh4->checksum = ip4_header_checksum (oh4); + } + } + + vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32)~0; + +trace: + if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED)) + { + esp_decrypt_trace_t *tr = vlib_add_trace (vm, node, 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); + } + vlib_put_next_frame (vm, node, next_index, n_left_to_next); + } + vlib_node_increment_counter (vm, dpdk_esp_decrypt_post_node.index, + ESP_DECRYPT_POST_ERROR_PKTS, + from_frame->n_vectors); + + return from_frame->n_vectors; +} + +/* *INDENT-OFF* */ +VLIB_REGISTER_NODE (dpdk_esp_decrypt_post_node) = { + .function = dpdk_esp_decrypt_post_node_fn, + .name = "dpdk-esp-decrypt-post", + .vector_size = sizeof (u32), + .format_trace = format_esp_decrypt_post_trace, + .type = VLIB_NODE_TYPE_INTERNAL, + + .n_errors = ARRAY_LEN(esp_decrypt_post_error_strings), + .error_strings = esp_decrypt_post_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* */ + +VLIB_NODE_FUNCTION_MULTIARCH (dpdk_esp_decrypt_post_node, dpdk_esp_decrypt_post_node_fn) |