2 * esp_encrypt.c : IPSec ESP encrypt node using DPDK Cryptodev
4 * Copyright (c) 2017 Intel and/or its affiliates.
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at:
9 * http://www.apache.org/licenses/LICENSE-2.0
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
18 #include <vnet/vnet.h>
19 #include <vnet/api_errno.h>
20 #include <vnet/ip/ip.h>
22 #include <vnet/ipsec/ipsec.h>
23 #include <vnet/ipsec/esp.h>
24 #include <dpdk/ipsec/ipsec.h>
25 #include <dpdk/device/dpdk.h>
26 #include <dpdk/device/dpdk_priv.h>
28 #define foreach_esp_encrypt_next \
29 _(DROP, "error-drop") \
30 _(IP4_LOOKUP, "ip4-lookup") \
31 _(IP6_LOOKUP, "ip6-lookup") \
32 _(INTERFACE_OUTPUT, "interface-output")
34 #define _(v, s) ESP_ENCRYPT_NEXT_##v,
37 foreach_esp_encrypt_next
42 #define foreach_esp_encrypt_error \
43 _(RX_PKTS, "ESP pkts received") \
44 _(SEQ_CYCLED, "Sequence number cycled") \
45 _(ENQ_FAIL, "Enqueue failed to crypto device") \
46 _(DISCARD, "Not enough crypto operations, discarding frame") \
47 _(SESSION, "Failed to get crypto session") \
48 _(NOSUP, "Cipher/Auth not supported")
53 #define _(sym,str) ESP_ENCRYPT_ERROR_##sym,
54 foreach_esp_encrypt_error
57 } esp_encrypt_error_t;
59 static char *esp_encrypt_error_strings[] = {
60 #define _(sym,string) string,
61 foreach_esp_encrypt_error
65 vlib_node_registration_t dpdk_esp_encrypt_node;
69 ipsec_crypto_alg_t crypto_alg;
70 ipsec_integ_alg_t integ_alg;
72 } esp_encrypt_trace_t;
74 /* packet trace format function */
76 format_esp_encrypt_trace (u8 * s, va_list * args)
78 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
79 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
80 esp_encrypt_trace_t *t = va_arg (*args, esp_encrypt_trace_t *);
81 ip4_header_t *ih4 = (ip4_header_t *) t->packet_data;
82 uword indent = format_get_indent (s), offset;
84 s = format (s, "cipher %U auth %U\n",
85 format_ipsec_crypto_alg, t->crypto_alg,
86 format_ipsec_integ_alg, t->integ_alg);
88 if ((ih4->ip_version_and_header_length & 0xF0) == 0x60)
90 s = format (s, "%U%U", format_white_space, indent,
91 format_ip6_header, ih4);
92 offset = sizeof (ip6_header_t);
96 s = format (s, "%U%U", format_white_space, indent,
97 format_ip4_header, ih4);
98 offset = ip4_header_bytes (ih4);
101 s = format (s, "\n%U%U", format_white_space, indent,
102 format_esp_header, t->packet_data + offset);
108 dpdk_esp_encrypt_node_fn (vlib_main_t * vm,
109 vlib_node_runtime_t * node,
110 vlib_frame_t * from_frame)
112 u32 n_left_from, *from, *to_next, next_index;
113 ipsec_main_t *im = &ipsec_main;
114 u32 thread_idx = vlib_get_thread_index ();
115 dpdk_crypto_main_t *dcm = &dpdk_crypto_main;
116 crypto_resource_t *res = 0;
118 crypto_alg_t *cipher_alg = 0, *auth_alg = 0;
119 struct rte_cryptodev_sym_session *session = 0;
120 u32 ret, last_sa_index = ~0;
121 u8 numa = rte_socket_id ();
123 crypto_worker_main_t *cwm =
124 vec_elt_at_index (dcm->workers_main, thread_idx);
125 struct rte_crypto_op **ops = cwm->ops;
127 from = vlib_frame_vector_args (from_frame);
128 n_left_from = from_frame->n_vectors;
130 ret = crypto_alloc_ops (numa, ops, n_left_from);
133 vlib_node_increment_counter (vm, dpdk_esp_encrypt_node.index,
134 ESP_ENCRYPT_ERROR_DISCARD, 1);
135 /* Discard whole frame */
139 next_index = ESP_ENCRYPT_NEXT_DROP;
141 while (n_left_from > 0)
145 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
147 while (n_left_from > 0 && n_left_to_next > 0)
151 vlib_buffer_t *b0 = 0;
153 ip4_and_esp_header_t *ih0, *oh0 = 0;
154 ip6_and_esp_header_t *ih6_0, *oh6_0 = 0;
157 u8 is_ipv6, next_hdr_type;
161 struct rte_mbuf *mb0 = 0;
162 struct rte_crypto_op *op;
169 b0 = vlib_get_buffer (vm, bi0);
170 ih0 = vlib_buffer_get_current (b0);
171 mb0 = rte_mbuf_from_vlib_buffer (b0);
174 CLIB_PREFETCH (ih0, sizeof (ih6_0[0]), LOAD);
176 CLIB_PREFETCH (vlib_buffer_get_tail (b0), 20, STORE);
178 CLIB_PREFETCH (mb0, CLIB_CACHE_LINE_BYTES, STORE);
182 ASSERT (op->status == RTE_CRYPTO_OP_STATUS_NOT_PROCESSED);
184 dpdk_op_priv_t *priv = crypto_op_get_priv (op);
187 sizeof (op[0]) + sizeof (op[0].sym[0]) + sizeof (priv[0]);
188 CLIB_PREFETCH (op, op_len, STORE);
190 sa_index0 = vnet_buffer (b0)->ipsec.sad_index;
192 if (sa_index0 != last_sa_index)
194 sa0 = pool_elt_at_index (im->sad, sa_index0);
197 vec_elt_at_index (dcm->cipher_algs, sa0->crypto_alg);
198 auth_alg = vec_elt_at_index (dcm->auth_algs, sa0->integ_alg);
201 is_aead = ((sa0->crypto_alg == IPSEC_CRYPTO_ALG_AES_GCM_128) ||
202 (sa0->crypto_alg == IPSEC_CRYPTO_ALG_AES_GCM_192) ||
203 (sa0->crypto_alg == IPSEC_CRYPTO_ALG_AES_GCM_256));
205 is_aead = (cipher_alg->type == RTE_CRYPTO_SYM_XFORM_AEAD);
209 auth_alg = cipher_alg;
211 res_idx = get_resource (cwm, sa0);
213 if (PREDICT_FALSE (res_idx == (u16) ~ 0))
215 clib_warning ("unsupported SA by thread index %u",
217 vlib_node_increment_counter (vm,
218 dpdk_esp_encrypt_node.index,
219 ESP_ENCRYPT_ERROR_NOSUP, 1);
225 res = vec_elt_at_index (dcm->resource, res_idx);
227 error = crypto_get_session (&session, sa_index0, res, cwm, 1);
228 if (PREDICT_FALSE (error || !session))
230 clib_warning ("failed to get crypto session");
231 vlib_node_increment_counter (vm,
232 dpdk_esp_encrypt_node.index,
233 ESP_ENCRYPT_ERROR_SESSION, 1);
240 last_sa_index = sa_index0;
243 if (PREDICT_FALSE (esp_seq_advance (sa0)))
245 clib_warning ("sequence number counter has cycled SPI %u",
247 vlib_node_increment_counter (vm, dpdk_esp_encrypt_node.index,
248 ESP_ENCRYPT_ERROR_SEQ_CYCLED, 1);
256 orig_sz = b0->current_length;
258 /* TODO multi-seg support - total_length_not_including_first_buffer */
259 sa0->total_data_size += b0->current_length;
261 res->ops[res->n_ops] = op;
262 res->bi[res->n_ops] = bi0;
265 dpdk_gcm_cnt_blk *icb = &priv->cb;
267 crypto_set_icb (icb, sa0->salt, sa0->seq, sa0->seq_hi);
269 is_ipv6 = (ih0->ip4.ip_version_and_header_length & 0xF0) == 0x60;
271 iv_size = cipher_alg->iv_len;
272 trunc_size = auth_alg->trunc_size;
276 if (!is_ipv6 && !sa0->is_tunnel_ip6) /* ip4inip4 */
278 /* in tunnel mode send it back to FIB */
279 priv->next = DPDK_CRYPTO_INPUT_NEXT_IP4_LOOKUP;
281 sizeof (ip4_header_t) + sizeof (esp_header_t) + iv_size;
282 vlib_buffer_advance (b0, -adv);
283 oh0 = vlib_buffer_get_current (b0);
284 next_hdr_type = IP_PROTOCOL_IP_IN_IP;
286 * oh0->ip4.ip_version_and_header_length = 0x45;
287 * oh0->ip4.tos = ih0->ip4.tos;
288 * oh0->ip4.fragment_id = 0;
289 * oh0->ip4.flags_and_fragment_offset = 0;
291 oh0->ip4.checksum_data_64[0] =
292 clib_host_to_net_u64 (0x45ULL << 56);
294 * oh0->ip4.ttl = 254;
295 * oh0->ip4.protocol = IP_PROTOCOL_IPSEC_ESP;
297 oh0->ip4.checksum_data_32[2] =
298 clib_host_to_net_u32 (0xfe320000);
300 oh0->ip4.src_address.as_u32 =
301 sa0->tunnel_src_addr.ip4.as_u32;
302 oh0->ip4.dst_address.as_u32 =
303 sa0->tunnel_dst_addr.ip4.as_u32;
305 oh0->esp.spi = clib_host_to_net_u32 (sa0->spi);
306 oh0->esp.seq = clib_host_to_net_u32 (sa0->seq);
308 else if (is_ipv6 && sa0->is_tunnel_ip6) /* ip6inip6 */
310 /* in tunnel mode send it back to FIB */
311 priv->next = DPDK_CRYPTO_INPUT_NEXT_IP6_LOOKUP;
314 sizeof (ip6_header_t) + sizeof (esp_header_t) + iv_size;
315 vlib_buffer_advance (b0, -adv);
316 ih6_0 = (ip6_and_esp_header_t *) ih0;
317 oh6_0 = vlib_buffer_get_current (b0);
319 next_hdr_type = IP_PROTOCOL_IPV6;
321 oh6_0->ip6.ip_version_traffic_class_and_flow_label =
322 ih6_0->ip6.ip_version_traffic_class_and_flow_label;
324 oh6_0->ip6.protocol = IP_PROTOCOL_IPSEC_ESP;
325 oh6_0->ip6.hop_limit = 254;
326 oh6_0->ip6.src_address.as_u64[0] =
327 sa0->tunnel_src_addr.ip6.as_u64[0];
328 oh6_0->ip6.src_address.as_u64[1] =
329 sa0->tunnel_src_addr.ip6.as_u64[1];
330 oh6_0->ip6.dst_address.as_u64[0] =
331 sa0->tunnel_dst_addr.ip6.as_u64[0];
332 oh6_0->ip6.dst_address.as_u64[1] =
333 sa0->tunnel_dst_addr.ip6.as_u64[1];
335 oh6_0->esp.spi = clib_host_to_net_u32 (sa0->spi);
336 oh6_0->esp.seq = clib_host_to_net_u32 (sa0->seq);
338 else /* unsupported ip4inip6, ip6inip4 */
340 vlib_node_increment_counter (vm,
341 dpdk_esp_encrypt_node.index,
342 ESP_ENCRYPT_ERROR_NOSUP, 1);
348 vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
350 else /* transport mode */
352 priv->next = DPDK_CRYPTO_INPUT_NEXT_INTERFACE_OUTPUT;
353 u16 rewrite_len = vnet_buffer (b0)->ip.save_rewrite_length;
354 u16 adv = sizeof (esp_header_t) + iv_size;
355 vlib_buffer_advance (b0, -rewrite_len - adv);
356 u8 *src = ((u8 *) ih0) - rewrite_len;
357 u8 *dst = vlib_buffer_get_current (b0);
358 oh0 = (ip4_and_esp_header_t *) (dst + rewrite_len);
362 orig_sz -= sizeof (ip6_header_t);
363 ih6_0 = (ip6_and_esp_header_t *) ih0;
364 next_hdr_type = ih6_0->ip6.protocol;
365 memmove (dst, src, rewrite_len + sizeof (ip6_header_t));
366 oh6_0 = (ip6_and_esp_header_t *) oh0;
367 oh6_0->ip6.protocol = IP_PROTOCOL_IPSEC_ESP;
372 orig_sz -= ip4_header_bytes (&ih0->ip4);
373 next_hdr_type = ih0->ip4.protocol;
375 rewrite_len + ip4_header_bytes (&ih0->ip4));
376 oh0->ip4.protocol = IP_PROTOCOL_IPSEC_ESP;
378 (esp_header_t *) (oh0 + ip4_header_bytes (&ih0->ip4));
380 esp0->spi = clib_host_to_net_u32 (sa0->spi);
381 esp0->seq = clib_host_to_net_u32 (sa0->seq);
384 ASSERT (is_pow2 (cipher_alg->boundary));
385 u16 mask = cipher_alg->boundary - 1;
386 u16 pad_payload_len = ((orig_sz + 2) + mask) & ~mask;
387 u8 pad_bytes = pad_payload_len - 2 - orig_sz;
390 vlib_buffer_put_uninit (b0, pad_bytes + 2 + trunc_size);
393 clib_memcpy (padding, pad_data, 16);
395 f0 = (esp_footer_t *) (padding + pad_bytes);
396 f0->pad_length = pad_bytes;
397 f0->next_header = next_hdr_type;
401 u16 len = b0->current_length - sizeof (ip6_header_t);
402 oh6_0->ip6.payload_length = clib_host_to_net_u16 (len);
406 oh0->ip4.length = clib_host_to_net_u16 (b0->current_length);
407 oh0->ip4.checksum = ip4_header_checksum (&oh0->ip4);
410 vnet_buffer (b0)->sw_if_index[VLIB_RX] =
411 vnet_buffer (b0)->sw_if_index[VLIB_RX];
412 b0->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID;
414 /* mbuf packet starts at ESP header */
415 mb0->data_len = vlib_buffer_get_tail (b0) - ((u8 *) esp0);
416 mb0->pkt_len = vlib_buffer_get_tail (b0) - ((u8 *) esp0);
417 mb0->data_off = ((void *) esp0) - mb0->buf_addr;
419 u32 cipher_off, cipher_len;
420 u32 auth_len = 0, aad_size = 0;
422 u8 *digest = vlib_buffer_get_tail (b0) - trunc_size;
424 if (!is_aead && cipher_alg->alg == RTE_CRYPTO_CIPHER_AES_CBC)
426 cipher_off = sizeof (esp_header_t);
427 cipher_len = iv_size + pad_payload_len;
431 u32 *esp_iv = (u32 *) (esp0 + 1);
432 esp_iv[0] = sa0->seq;
433 esp_iv[1] = sa0->seq_hi;
435 cipher_off = sizeof (esp_header_t) + iv_size;
436 cipher_len = pad_payload_len;
438 iv_size = 12; /* CTR/GCM IV size, not ESP IV size */
443 aad = (u32 *) priv->aad;
444 aad[0] = clib_host_to_net_u32 (sa0->spi);
445 aad[1] = clib_host_to_net_u32 (sa0->seq);
449 aad[2] = clib_host_to_net_u32 (sa0->seq_hi);
458 vlib_buffer_get_tail (b0) - ((u8 *) esp0) - trunc_size;
461 *((u32 *) digest) = sa0->seq_hi;
466 crypto_op_setup (is_aead, mb0, op, session,
467 cipher_off, cipher_len, (u8 *) icb, iv_size,
468 0, auth_len, (u8 *) aad, aad_size,
469 digest, 0, trunc_size);
472 if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
474 esp_encrypt_trace_t *tr =
475 vlib_add_trace (vm, node, b0, sizeof (*tr));
476 tr->crypto_alg = sa0->crypto_alg;
477 tr->integ_alg = sa0->integ_alg;
478 u8 *p = vlib_buffer_get_current (b0);
480 p += vnet_buffer (b0)->ip.save_rewrite_length;
481 clib_memcpy (tr->packet_data, p, sizeof (tr->packet_data));
484 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
486 vlib_node_increment_counter (vm, dpdk_esp_encrypt_node.index,
487 ESP_ENCRYPT_ERROR_RX_PKTS,
488 from_frame->n_vectors);
490 crypto_enqueue_ops (vm, cwm, 1, dpdk_esp_encrypt_node.index,
491 ESP_ENCRYPT_ERROR_ENQ_FAIL, numa);
493 crypto_free_ops (numa, ops, cwm->ops + from_frame->n_vectors - ops);
495 return from_frame->n_vectors;
499 VLIB_REGISTER_NODE (dpdk_esp_encrypt_node) = {
500 .function = dpdk_esp_encrypt_node_fn,
501 .name = "dpdk-esp-encrypt",
502 .flags = VLIB_NODE_FLAG_IS_OUTPUT,
503 .vector_size = sizeof (u32),
504 .format_trace = format_esp_encrypt_trace,
505 .n_errors = ARRAY_LEN (esp_encrypt_error_strings),
506 .error_strings = esp_encrypt_error_strings,
510 [ESP_ENCRYPT_NEXT_DROP] = "error-drop",
515 VLIB_NODE_FUNCTION_MULTIARCH (dpdk_esp_encrypt_node, dpdk_esp_encrypt_node_fn)
517 * fd.io coding-style-patch-verification: ON
520 * eval: (c-set-style "gnu")