#include <vnet/ipsec/ipsec.h>
#include <vnet/ipsec/esp.h>
+#include <vnet/ipsec/ipsec_io.h>
+#include <vnet/ipsec/ipsec_tun.h>
#define foreach_esp_decrypt_next \
_(DROP, "error-drop") \
-_(IP4_INPUT, "ip4-input") \
-_(IP6_INPUT, "ip6-input") \
-_(IPSEC_GRE_INPUT, "ipsec-gre-input")
+_(IP4_INPUT, "ip4-input-no-checksum") \
+_(IP6_INPUT, "ip6-input")
#define _(v, s) ESP_DECRYPT_NEXT_##v,
typedef enum
} 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)")
+#define foreach_esp_decrypt_error \
+ _(RX_PKTS, "ESP pkts received") \
+ _(DECRYPTION_FAILED, "ESP decryption failed") \
+ _(INTEG_ERROR, "Integrity check failed") \
+ _(CRYPTO_ENGINE_ERROR, "crypto engine error (packet dropped)") \
+ _(REPLAY, "SA replayed packet") \
+ _(RUNT, "undersized packet") \
+ _(CHAINED_BUFFER, "chained buffers (packet dropped)") \
+ _(OVERSIZED_HEADER, "buffer with oversized header (dropped)") \
+ _(NO_TAIL_SPACE, "no enough buffer tail space (dropped)") \
+ _(TUN_NO_PROTO, "no tunnel protocol") \
typedef enum
typedef struct
{
+ u32 seq;
+ u32 sa_seq;
+ u32 sa_seq_hi;
ipsec_crypto_alg_t crypto_alg;
ipsec_integ_alg_t integ_alg;
} esp_decrypt_trace_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);
+ s =
+ format (s,
+ "esp: crypto %U integrity %U pkt-seq %d sa-seq %u sa-seq-hi %u",
+ format_ipsec_crypto_alg, t->crypto_alg, format_ipsec_integ_alg,
+ t->integ_alg, t->seq, t->sa_seq, t->sa_seq_hi);
return s;
}
-always_inline void
-esp_decrypt_cbc (ipsec_crypto_alg_t alg,
- u8 * in, u8 * out, size_t in_len, u8 * key, u8 * iv)
+typedef struct
{
- ipsec_proto_main_t *em = &ipsec_proto_main;
- u32 thread_index = vlib_get_thread_index ();
-#if OPENSSL_VERSION_NUMBER >= 0x10100000L
- EVP_CIPHER_CTX *ctx = em->per_thread_data[thread_index].decrypt_ctx;
-#else
- EVP_CIPHER_CTX *ctx = &(em->per_thread_data[thread_index].decrypt_ctx);
-#endif
- const EVP_CIPHER *cipher = NULL;
- int out_len;
-
- ASSERT (alg < IPSEC_CRYPTO_N_ALG);
-
- if (PREDICT_FALSE (em->ipsec_proto_main_crypto_algs[alg].type == 0))
- return;
-
- if (PREDICT_FALSE
- (alg != em->per_thread_data[thread_index].last_decrypt_alg))
+ union
+ {
+ struct
{
- cipher = em->ipsec_proto_main_crypto_algs[alg].type;
- em->per_thread_data[thread_index].last_decrypt_alg = alg;
- }
+ u8 icv_sz;
+ u8 iv_sz;
+ ipsec_sa_flags_t flags;
+ u32 sa_index;
+ };
+ u64 sa_data;
+ };
- EVP_DecryptInit_ex (ctx, cipher, NULL, key, iv);
+ u32 seq;
+ i16 current_data;
+ i16 current_length;
+ u16 hdr_sz;
+} esp_decrypt_packet_data_t;
- EVP_DecryptUpdate (ctx, out, &out_len, in, in_len);
- EVP_DecryptFinal_ex (ctx, out + out_len, &out_len);
-}
+STATIC_ASSERT_SIZEOF (esp_decrypt_packet_data_t, 3 * sizeof (u64));
+
+#define ESP_ENCRYPT_PD_F_FD_TRANSPORT (1 << 2)
always_inline uword
esp_decrypt_inline (vlib_main_t * vm,
vlib_node_runtime_t * node, vlib_frame_t * from_frame,
- int is_ip6)
+ int is_ip6, int is_tun)
{
- u32 n_left_from, *from, next_index, *to_next;
ipsec_main_t *im = &ipsec_main;
- ipsec_proto_main_t *em = &ipsec_proto_main;
- u32 *recycle = 0;
- from = vlib_frame_vector_args (from_frame);
- n_left_from = from_frame->n_vectors;
- u32 thread_index = vlib_get_thread_index ();
+ u32 thread_index = vm->thread_index;
+ u16 buffer_data_size = vlib_buffer_get_default_data_size (vm);
+ u16 len;
+ ipsec_per_thread_data_t *ptd = vec_elt_at_index (im->ptd, thread_index);
+ u32 *from = vlib_frame_vector_args (from_frame);
+ u32 n, n_left = from_frame->n_vectors;
+ vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b = bufs;
+ u16 nexts[VLIB_FRAME_SIZE], *next = nexts;
+ esp_decrypt_packet_data_t pkt_data[VLIB_FRAME_SIZE], *pd = pkt_data;
+ esp_decrypt_packet_data_t cpd = { };
+ u32 current_sa_index = ~0, current_sa_bytes = 0, current_sa_pkts = 0;
+ const u8 esp_sz = sizeof (esp_header_t);
+ ipsec_sa_t *sa0 = 0;
+
+ vlib_get_buffers (vm, from, b, n_left);
+ vec_reset_length (ptd->crypto_ops);
+ vec_reset_length (ptd->integ_ops);
+ clib_memset_u16 (nexts, -1, n_left);
+
+ while (n_left > 0)
+ {
+ u8 *payload;
- ipsec_alloc_empty_buffers (vm, im);
+ if (n_left > 2)
+ {
+ u8 *p;
+ vlib_prefetch_buffer_header (b[2], LOAD);
+ p = vlib_buffer_get_current (b[1]);
+ CLIB_PREFETCH (p, CLIB_CACHE_LINE_BYTES, LOAD);
+ p -= CLIB_CACHE_LINE_BYTES;
+ CLIB_PREFETCH (p, CLIB_CACHE_LINE_BYTES, LOAD);
+ }
- u32 *empty_buffers = im->empty_buffers[thread_index];
+ if (vlib_buffer_chain_linearize (vm, b[0]) != 1)
+ {
+ b[0]->error = node->errors[ESP_DECRYPT_ERROR_CHAINED_BUFFER];
+ next[0] = ESP_DECRYPT_NEXT_DROP;
+ goto next;
+ }
- if (PREDICT_FALSE (vec_len (empty_buffers) < n_left_from))
- {
- if (is_ip6)
- vlib_node_increment_counter (vm, esp6_decrypt_node.index,
- ESP_DECRYPT_ERROR_NO_BUFFER,
- n_left_from);
- else
- vlib_node_increment_counter (vm, esp4_decrypt_node.index,
- ESP_DECRYPT_ERROR_NO_BUFFER,
- n_left_from);
- goto free_buffers_and_exit;
- }
+ if (vnet_buffer (b[0])->ipsec.sad_index != current_sa_index)
+ {
+ if (current_sa_pkts)
+ vlib_increment_combined_counter (&ipsec_sa_counters, thread_index,
+ current_sa_index,
+ current_sa_pkts,
+ current_sa_bytes);
+ current_sa_bytes = current_sa_pkts = 0;
+
+ current_sa_index = vnet_buffer (b[0])->ipsec.sad_index;
+ sa0 = pool_elt_at_index (im->sad, current_sa_index);
+ cpd.icv_sz = sa0->integ_icv_size;
+ cpd.iv_sz = sa0->crypto_iv_size;
+ cpd.flags = sa0->flags;
+ cpd.sa_index = current_sa_index;
+ }
- next_index = node->cached_next_index;
+ /* store packet data for next round for easier prefetch */
+ pd->sa_data = cpd.sa_data;
+ pd->current_data = b[0]->current_data;
+ pd->current_length = b[0]->current_length;
+ pd->hdr_sz = pd->current_data - vnet_buffer (b[0])->l3_hdr_offset;
+ payload = b[0]->data + pd->current_data;
+ pd->seq = clib_host_to_net_u32 (((esp_header_t *) payload)->seq);
+
+ /* we need 4 extra bytes for HMAC calculation when ESN are used */
+ if (ipsec_sa_is_set_USE_ESN (sa0) && pd->icv_sz &&
+ (pd->current_data + pd->current_length + 4 > buffer_data_size))
+ {
+ b[0]->error = node->errors[ESP_DECRYPT_ERROR_NO_TAIL_SPACE];
+ next[0] = ESP_DECRYPT_NEXT_DROP;
+ goto next;
+ }
- while (n_left_from > 0)
- {
- u32 n_left_to_next;
+ /* anti-reply check */
+ if (ipsec_sa_anti_replay_check (sa0, pd->seq))
+ {
+ b[0]->error = node->errors[ESP_DECRYPT_ERROR_REPLAY];
+ next[0] = ESP_DECRYPT_NEXT_DROP;
+ goto next;
+ }
+
+ if (pd->current_length < cpd.icv_sz + esp_sz + cpd.iv_sz)
+ {
+ b[0]->error = node->errors[ESP_DECRYPT_ERROR_RUNT];
+ next[0] = ESP_DECRYPT_NEXT_DROP;
+ goto next;
+ }
- vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
+ len = pd->current_length - cpd.icv_sz;
+ current_sa_pkts += 1;
+ current_sa_bytes += pd->current_length;
- while (n_left_from > 0 && n_left_to_next > 0)
+ if (PREDICT_TRUE (sa0->integ_op_id != VNET_CRYPTO_OP_NONE))
{
- u32 i_bi0, o_bi0 = (u32) ~ 0, next0;
- vlib_buffer_t *i_b0;
- vlib_buffer_t *o_b0 = 0;
- esp_header_t *esp0;
- ipsec_sa_t *sa0;
- u32 sa_index0 = ~0;
- u32 seq;
- ip4_header_t *ih4 = 0, *oh4 = 0;
- ip6_header_t *ih6 = 0, *oh6 = 0;
- u8 tunnel_mode = 1;
-
- i_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, i_bi0);
- esp0 = vlib_buffer_get_current (i_b0);
-
- sa_index0 = vnet_buffer (i_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)
+ vnet_crypto_op_t *op;
+ vec_add2_aligned (ptd->integ_ops, op, 1, CLIB_CACHE_LINE_BYTES);
+
+ vnet_crypto_op_init (op, sa0->integ_op_id);
+ op->key_index = sa0->integ_key_index;
+ op->src = payload;
+ op->flags = VNET_CRYPTO_OP_FLAG_HMAC_CHECK;
+ op->user_data = b - bufs;
+ op->digest = payload + len;
+ op->digest_len = cpd.icv_sz;
+ op->len = len;
+ if (ipsec_sa_is_set_USE_ESN (sa0))
{
- int rv = 0;
+ /* shift ICV by 4 bytes to insert ESN */
+ u32 seq_hi = clib_host_to_net_u32 (sa0->seq_hi);
+ u8 tmp[ESP_MAX_ICV_SIZE], sz = sizeof (sa0->seq_hi);
+ clib_memcpy_fast (tmp, payload + len, ESP_MAX_ICV_SIZE);
+ clib_memcpy_fast (payload + len, &seq_hi, sz);
+ clib_memcpy_fast (payload + len + sz, tmp, ESP_MAX_ICV_SIZE);
+ op->len += sz;
+ op->digest += sz;
+ }
+ }
- if (PREDICT_TRUE (sa0->use_esn))
- rv = esp_replay_check_esn (sa0, seq);
- else
- rv = esp_replay_check (sa0, seq);
+ payload += esp_sz;
+ len -= esp_sz;
- if (PREDICT_FALSE (rv))
- {
- clib_warning ("anti-replay SPI %u seq %u", sa0->spi, seq);
- if (is_ip6)
- vlib_node_increment_counter (vm,
- esp6_decrypt_node.index,
- ESP_DECRYPT_ERROR_REPLAY, 1);
- else
- vlib_node_increment_counter (vm,
- esp4_decrypt_node.index,
- ESP_DECRYPT_ERROR_REPLAY, 1);
- o_bi0 = i_bi0;
- to_next[0] = o_bi0;
- to_next += 1;
- goto trace;
- }
+ if (sa0->crypto_enc_op_id != VNET_CRYPTO_OP_NONE)
+ {
+ vnet_crypto_op_t *op;
+ vec_add2_aligned (ptd->crypto_ops, op, 1, CLIB_CACHE_LINE_BYTES);
+ vnet_crypto_op_init (op, sa0->crypto_dec_op_id);
+ op->key_index = sa0->crypto_key_index;
+ op->iv = payload;
+
+ if (ipsec_sa_is_set_IS_AEAD (sa0))
+ {
+ esp_header_t *esp0;
+ esp_aead_t *aad;
+ u8 *scratch;
+
+ /*
+ * construct the AAD and the nonce (Salt || IV) in a scratch
+ * space in front of the IP header.
+ */
+ scratch = payload - esp_sz;
+ esp0 = (esp_header_t *) (scratch);
+
+ scratch -= (sizeof (*aad) + pd->hdr_sz);
+ op->aad = scratch;
+
+ esp_aad_fill (op, esp0, sa0);
+
+ /*
+ * we don't need to refer to the ESP header anymore so we
+ * can overwrite it with the salt and use the IV where it is
+ * to form the nonce = (Salt + IV)
+ */
+ op->iv -= sizeof (sa0->salt);
+ clib_memcpy_fast (op->iv, &sa0->salt, sizeof (sa0->salt));
+
+ op->tag = payload + len;
+ op->tag_len = 16;
}
+ op->src = op->dst = payload += cpd.iv_sz;
+ op->len = len - cpd.iv_sz;
+ op->user_data = b - bufs;
+ }
+
+ /* next */
+ next:
+ n_left -= 1;
+ next += 1;
+ pd += 1;
+ b += 1;
+ }
- sa0->total_data_size += i_b0->current_length;
+ vlib_increment_combined_counter (&ipsec_sa_counters, thread_index,
+ current_sa_index, current_sa_pkts,
+ current_sa_bytes);
- if (PREDICT_TRUE (sa0->integ_alg != IPSEC_INTEG_ALG_NONE))
+ if ((n = vec_len (ptd->integ_ops)))
+ {
+ vnet_crypto_op_t *op = ptd->integ_ops;
+ n -= vnet_crypto_process_ops (vm, op, n);
+ while (n)
+ {
+ ASSERT (op - ptd->integ_ops < vec_len (ptd->integ_ops));
+ if (op->status != VNET_CRYPTO_OP_STATUS_COMPLETED)
{
- u8 sig[64];
- int icv_size =
- em->ipsec_proto_main_integ_algs[sa0->integ_alg].trunc_size;
- memset (sig, 0, sizeof (sig));
- u8 *icv =
- vlib_buffer_get_current (i_b0) + i_b0->current_length -
- icv_size;
- i_b0->current_length -= icv_size;
-
- hmac_calc (sa0->integ_alg, sa0->integ_key, sa0->integ_key_len,
- (u8 *) esp0, i_b0->current_length, sig, sa0->use_esn,
- sa0->seq_hi);
-
- if (PREDICT_FALSE (memcmp (icv, sig, icv_size)))
- {
- if (is_ip6)
- vlib_node_increment_counter (vm,
- esp6_decrypt_node.index,
- ESP_DECRYPT_ERROR_INTEG_ERROR,
- 1);
- else
- vlib_node_increment_counter (vm,
- esp4_decrypt_node.index,
- ESP_DECRYPT_ERROR_INTEG_ERROR,
- 1);
- o_bi0 = i_bi0;
- to_next[0] = o_bi0;
- to_next += 1;
- goto trace;
- }
+ u32 err, bi = op->user_data;
+ if (op->status == VNET_CRYPTO_OP_STATUS_FAIL_BAD_HMAC)
+ err = ESP_DECRYPT_ERROR_INTEG_ERROR;
+ else
+ err = ESP_DECRYPT_ERROR_CRYPTO_ENGINE_ERROR;
+ bufs[bi]->error = node->errors[err];
+ nexts[bi] = ESP_DECRYPT_NEXT_DROP;
+ n--;
}
-
- if (PREDICT_TRUE (sa0->use_anti_replay))
+ op++;
+ }
+ }
+ if ((n = vec_len (ptd->crypto_ops)))
+ {
+ vnet_crypto_op_t *op = ptd->crypto_ops;
+ n -= vnet_crypto_process_ops (vm, op, n);
+ while (n)
+ {
+ ASSERT (op - ptd->crypto_ops < vec_len (ptd->crypto_ops));
+ if (op->status != VNET_CRYPTO_OP_STATUS_COMPLETED)
{
- if (PREDICT_TRUE (sa0->use_esn))
- esp_replay_advance_esn (sa0, seq);
+ u32 err, bi;
+
+ bi = op->user_data;
+
+ if (op->status == VNET_CRYPTO_OP_STATUS_FAIL_BAD_HMAC)
+ err = ESP_DECRYPT_ERROR_DECRYPTION_FAILED;
else
- esp_replay_advance (sa0, seq);
+ err = ESP_DECRYPT_ERROR_CRYPTO_ENGINE_ERROR;
+
+ bufs[bi]->error = node->errors[err];
+ nexts[bi] = ESP_DECRYPT_NEXT_DROP;
+ n--;
}
+ op++;
+ }
+ }
- /* grab free buffer */
- uword last_empty_buffer = vec_len (empty_buffers) - 1;
- o_bi0 = empty_buffers[last_empty_buffer];
- to_next[0] = o_bi0;
- to_next += 1;
- o_b0 = vlib_get_buffer (vm, o_bi0);
- vlib_prefetch_buffer_with_index (vm,
- empty_buffers[last_empty_buffer -
- 1], STORE);
- _vec_len (empty_buffers) = last_empty_buffer;
-
- /* add old buffer to the recycle list */
- vec_add1 (recycle, i_bi0);
-
- if ((sa0->crypto_alg >= IPSEC_CRYPTO_ALG_AES_CBC_128 &&
- sa0->crypto_alg <= IPSEC_CRYPTO_ALG_AES_CBC_256) ||
- (sa0->crypto_alg >= IPSEC_CRYPTO_ALG_DES_CBC &&
- sa0->crypto_alg <= IPSEC_CRYPTO_ALG_3DES_CBC))
- {
- const int BLOCK_SIZE =
- em->ipsec_proto_main_crypto_algs[sa0->crypto_alg].block_size;;
- const int IV_SIZE =
- em->ipsec_proto_main_crypto_algs[sa0->crypto_alg].iv_size;
- esp_footer_t *f0;
- u8 ip_hdr_size = 0;
+ /* Post decryption ronud - adjust packet data start and length and next
+ node */
- int blocks =
- (i_b0->current_length - sizeof (esp_header_t) -
- IV_SIZE) / BLOCK_SIZE;
+ n_left = from_frame->n_vectors;
+ next = nexts;
+ pd = pkt_data;
+ b = bufs;
- o_b0->current_data = sizeof (ethernet_header_t);
+ while (n_left)
+ {
+ const u8 tun_flags = IPSEC_SA_FLAG_IS_TUNNEL |
+ IPSEC_SA_FLAG_IS_TUNNEL_V6;
- /* transport mode */
- if (PREDICT_FALSE (!sa0->is_tunnel && !sa0->is_tunnel_ip6))
- {
- tunnel_mode = 0;
+ if (n_left >= 2)
+ {
+ void *data = b[1]->data + pd[1].current_data;
- if (is_ip6)
- {
- ih6 =
- (ip6_header_t *) ((u8 *) esp0 -
- sizeof (ip6_header_t));
- ip_hdr_size = sizeof (ip6_header_t);
- oh6 = vlib_buffer_get_current (o_b0);
- }
- else
- {
- ih4 =
- (ip4_header_t *) ((u8 *) esp0 -
- sizeof (ip4_header_t));
- oh4 = vlib_buffer_get_current (o_b0);
- ip_hdr_size = sizeof (ip4_header_t);
- }
- }
+ /* buffer metadata */
+ vlib_prefetch_buffer_header (b[1], LOAD);
- esp_decrypt_cbc (sa0->crypto_alg,
- esp0->data + IV_SIZE,
- (u8 *) vlib_buffer_get_current (o_b0) +
- ip_hdr_size, BLOCK_SIZE * blocks,
- sa0->crypto_key, esp0->data);
-
- o_b0->current_length = (blocks * BLOCK_SIZE) - 2 + ip_hdr_size;
- o_b0->flags = VLIB_BUFFER_TOTAL_LENGTH_VALID;
- f0 =
- (esp_footer_t *) ((u8 *) vlib_buffer_get_current (o_b0) +
- o_b0->current_length);
- o_b0->current_length -= f0->pad_length;
-
- /* tunnel mode */
- if (PREDICT_TRUE (tunnel_mode))
- {
- if (PREDICT_TRUE (f0->next_header == IP_PROTOCOL_IP_IN_IP))
- {
- next0 = ESP_DECRYPT_NEXT_IP4_INPUT;
- oh4 = vlib_buffer_get_current (o_b0);
- }
- else if (f0->next_header == IP_PROTOCOL_IPV6)
- next0 = ESP_DECRYPT_NEXT_IP6_INPUT;
- else
- {
- clib_warning ("next header: 0x%x", f0->next_header);
- if (is_ip6)
- vlib_node_increment_counter (vm,
- esp6_decrypt_node.index,
- ESP_DECRYPT_ERROR_DECRYPTION_FAILED,
- 1);
- else
- vlib_node_increment_counter (vm,
- esp4_decrypt_node.index,
- ESP_DECRYPT_ERROR_DECRYPTION_FAILED,
- 1);
- o_b0 = 0;
- goto trace;
- }
- }
- /* transport mode */
- else
- {
- if (is_ip6)
- {
- next0 = ESP_DECRYPT_NEXT_IP6_INPUT;
- oh6->ip_version_traffic_class_and_flow_label =
- ih6->ip_version_traffic_class_and_flow_label;
- oh6->protocol = f0->next_header;
- oh6->hop_limit = ih6->hop_limit;
- oh6->src_address.as_u64[0] = ih6->src_address.as_u64[0];
- oh6->src_address.as_u64[1] = ih6->src_address.as_u64[1];
- oh6->dst_address.as_u64[0] = ih6->dst_address.as_u64[0];
- oh6->dst_address.as_u64[1] = ih6->dst_address.as_u64[1];
- oh6->payload_length =
- clib_host_to_net_u16 (vlib_buffer_length_in_chain
- (vm,
- o_b0) - sizeof (ip6_header_t));
- }
- else
- {
- next0 = ESP_DECRYPT_NEXT_IP4_INPUT;
- oh4->ip_version_and_header_length = 0x45;
- oh4->tos = ih4->tos;
- oh4->fragment_id = 0;
- oh4->flags_and_fragment_offset = 0;
- oh4->ttl = ih4->ttl;
- oh4->protocol = f0->next_header;
- oh4->src_address.as_u32 = ih4->src_address.as_u32;
- oh4->dst_address.as_u32 = ih4->dst_address.as_u32;
- oh4->length =
- clib_host_to_net_u16 (vlib_buffer_length_in_chain
- (vm, o_b0));
- oh4->checksum = ip4_header_checksum (oh4);
- }
- }
+ /* esp_footer_t */
+ CLIB_PREFETCH (data + pd[1].current_length - pd[1].icv_sz - 2,
+ CLIB_CACHE_LINE_BYTES, LOAD);
- /* for IPSec-GRE tunnel next node is ipsec-gre-input */
- if (PREDICT_FALSE
- ((vnet_buffer (i_b0)->ipsec.flags) &
- IPSEC_FLAG_IPSEC_GRE_TUNNEL))
- next0 = ESP_DECRYPT_NEXT_IPSEC_GRE_INPUT;
+ /* packet headers */
+ CLIB_PREFETCH (data - CLIB_CACHE_LINE_BYTES,
+ CLIB_CACHE_LINE_BYTES * 2, LOAD);
+ }
- vnet_buffer (o_b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
- vnet_buffer (o_b0)->sw_if_index[VLIB_RX] =
- vnet_buffer (i_b0)->sw_if_index[VLIB_RX];
- }
+ if (next[0] < ESP_DECRYPT_N_NEXT)
+ goto trace;
+
+ sa0 = vec_elt_at_index (im->sad, pd->sa_index);
+
+ /*
+ * redo the anti-reply check
+ * in this frame say we have sequence numbers, s, s+1, s+1, s+1
+ * and s and s+1 are in the window. When we did the anti-replay
+ * check above we did so against the state of the window (W),
+ * after packet s-1. So each of the packets in the sequence will be
+ * accepted.
+ * This time s will be cheked against Ws-1, s+1 chceked against Ws
+ * (i.e. the window state is updated/advnaced)
+ * so this time the successive s+! packet will be dropped.
+ * This is a consequence of batching the decrypts. If the
+ * check-dcrypt-advance process was done for each packet it would
+ * be fine. But we batch the decrypts because it's much more efficient
+ * to do so in SW and if we offload to HW and the process is async.
+ *
+ * You're probably thinking, but this means an attacker can send the
+ * above sequence and cause VPP to perform decrpyts that will fail,
+ * and that's true. But if the attacker can determine s (a valid
+ * sequence number in the window) which is non-trivial, it can generate
+ * a sequence s, s+1, s+2, s+3, ... s+n and nothing will prevent any
+ * implementation, sequential or batching, from decrypting these.
+ */
+ if (ipsec_sa_anti_replay_check (sa0, pd->seq))
+ {
+ b[0]->error = node->errors[ESP_DECRYPT_ERROR_REPLAY];
+ next[0] = ESP_DECRYPT_NEXT_DROP;
+ goto trace;
+ }
+
+ ipsec_sa_anti_replay_advance (sa0, pd->seq);
- trace:
- if (PREDICT_FALSE (i_b0->flags & VLIB_BUFFER_IS_TRACED))
+ esp_footer_t *f = (esp_footer_t *) (b[0]->data + pd->current_data +
+ pd->current_length - sizeof (*f) -
+ pd->icv_sz);
+ u16 adv = pd->iv_sz + esp_sz;
+ u16 tail = sizeof (esp_footer_t) + f->pad_length + pd->icv_sz;
+
+ if ((pd->flags & tun_flags) == 0 && !is_tun) /* transport mode */
+ {
+ u8 udp_sz = (is_ip6 == 0 && pd->flags & IPSEC_SA_FLAG_UDP_ENCAP) ?
+ sizeof (udp_header_t) : 0;
+ u16 ip_hdr_sz = pd->hdr_sz - udp_sz;
+ u8 *old_ip = b[0]->data + pd->current_data - ip_hdr_sz - udp_sz;
+ u8 *ip = old_ip + adv + udp_sz;
+
+ if (is_ip6 && ip_hdr_sz > 64)
+ memmove (ip, old_ip, ip_hdr_sz);
+ else
+ clib_memcpy_le64 (ip, old_ip, ip_hdr_sz);
+
+ b[0]->current_data = pd->current_data + adv - ip_hdr_sz;
+ b[0]->current_length = pd->current_length + ip_hdr_sz - tail - adv;
+
+ if (is_ip6)
+ {
+ ip6_header_t *ip6 = (ip6_header_t *) ip;
+ u16 len = clib_net_to_host_u16 (ip6->payload_length);
+ len -= adv + tail;
+ ip6->payload_length = clib_host_to_net_u16 (len);
+ ip6->protocol = f->next_header;
+ next[0] = ESP_DECRYPT_NEXT_IP6_INPUT;
+ }
+ else
{
- if (o_b0)
+ ip4_header_t *ip4 = (ip4_header_t *) ip;
+ ip_csum_t sum = ip4->checksum;
+ u16 len = clib_net_to_host_u16 (ip4->length);
+ len = clib_host_to_net_u16 (len - adv - tail - udp_sz);
+ sum = ip_csum_update (sum, ip4->protocol, f->next_header,
+ ip4_header_t, protocol);
+ sum = ip_csum_update (sum, ip4->length, len,
+ ip4_header_t, length);
+ ip4->checksum = ip_csum_fold (sum);
+ ip4->protocol = f->next_header;
+ ip4->length = len;
+ next[0] = ESP_DECRYPT_NEXT_IP4_INPUT;
+ }
+ }
+ else
+ {
+ if (PREDICT_TRUE (f->next_header == IP_PROTOCOL_IP_IN_IP))
+ {
+ next[0] = ESP_DECRYPT_NEXT_IP4_INPUT;
+ b[0]->current_data = pd->current_data + adv;
+ b[0]->current_length = pd->current_length - adv - tail;
+ }
+ else if (f->next_header == IP_PROTOCOL_IPV6)
+ {
+ next[0] = ESP_DECRYPT_NEXT_IP6_INPUT;
+ b[0]->current_data = pd->current_data + adv;
+ b[0]->current_length = pd->current_length - adv - tail;
+ }
+ else
+ {
+ next[0] = ESP_DECRYPT_NEXT_DROP;
+ b[0]->error = node->errors[ESP_DECRYPT_ERROR_DECRYPTION_FAILED];
+ goto trace;
+ }
+ if (is_tun)
+ {
+ if (ipsec_sa_is_set_IS_PROTECT (sa0))
{
- o_b0->flags |= VLIB_BUFFER_IS_TRACED;
- o_b0->trace_index = i_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;
+ /*
+ * Check that the reveal IP header matches that
+ * of the tunnel we are protecting
+ */
+ const ipsec_tun_protect_t *itp;
+
+ itp =
+ ipsec_tun_protect_get (vnet_buffer (b[0])->
+ ipsec.protect_index);
+ if (PREDICT_TRUE (f->next_header == IP_PROTOCOL_IP_IN_IP))
+ {
+ const ip4_header_t *ip4;
+
+ ip4 = vlib_buffer_get_current (b[0]);
+
+ if (!ip46_address_is_equal_v4 (&itp->itp_tun.src,
+ &ip4->dst_address) ||
+ !ip46_address_is_equal_v4 (&itp->itp_tun.dst,
+ &ip4->src_address))
+ {
+ next[0] = ESP_DECRYPT_NEXT_DROP;
+ b[0]->error =
+ node->errors[ESP_DECRYPT_ERROR_TUN_NO_PROTO];
+ }
+ }
+ else if (f->next_header == IP_PROTOCOL_IPV6)
+ {
+ const ip6_header_t *ip6;
+
+ ip6 = vlib_buffer_get_current (b[0]);
+
+ if (!ip46_address_is_equal_v6 (&itp->itp_tun.src,
+ &ip6->dst_address) ||
+ !ip46_address_is_equal_v6 (&itp->itp_tun.dst,
+ &ip6->src_address))
+ {
+ next[0] = ESP_DECRYPT_NEXT_DROP;
+ b[0]->error =
+ node->errors[ESP_DECRYPT_ERROR_TUN_NO_PROTO];
+ }
+ }
}
}
+ }
- vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
- n_left_to_next, o_bi0, next0);
+ trace:
+ if (PREDICT_FALSE (b[0]->flags & VLIB_BUFFER_IS_TRACED))
+ {
+ esp_decrypt_trace_t *tr;
+ tr = vlib_add_trace (vm, node, b[0], sizeof (*tr));
+ sa0 = pool_elt_at_index (im->sad,
+ vnet_buffer (b[0])->ipsec.sad_index);
+ tr->crypto_alg = sa0->crypto_alg;
+ tr->integ_alg = sa0->integ_alg;
+ tr->seq = pd->seq;
+ tr->sa_seq = sa0->last_seq;
+ tr->sa_seq_hi = sa0->seq_hi;
}
- vlib_put_next_frame (vm, node, next_index, n_left_to_next);
+
+ /* next */
+ n_left -= 1;
+ next += 1;
+ pd += 1;
+ b += 1;
}
- if (is_ip6)
- vlib_node_increment_counter (vm, esp6_decrypt_node.index,
- ESP_DECRYPT_ERROR_RX_PKTS,
- from_frame->n_vectors);
- else
- vlib_node_increment_counter (vm, esp4_decrypt_node.index,
- ESP_DECRYPT_ERROR_RX_PKTS,
- from_frame->n_vectors);
-
-
-free_buffers_and_exit:
- if (recycle)
- vlib_buffer_free (vm, recycle, vec_len (recycle));
- vec_free (recycle);
- return from_frame->n_vectors;
+
+ n_left = from_frame->n_vectors;
+ vlib_node_increment_counter (vm, node->node_index,
+ ESP_DECRYPT_ERROR_RX_PKTS, n_left);
+
+ vlib_buffer_enqueue_to_next (vm, node, from, nexts, n_left);
+
+ b = bufs;
+ return n_left;
}
-static uword
-esp4_decrypt_node_fn (vlib_main_t * vm,
- vlib_node_runtime_t * node, vlib_frame_t * from_frame)
+VLIB_NODE_FN (esp4_decrypt_node) (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * from_frame)
{
- return esp_decrypt_inline (vm, node, from_frame, 0 /* is_ip6 */ );
+ return esp_decrypt_inline (vm, node, from_frame, 0, 0);
+}
+
+VLIB_NODE_FN (esp4_decrypt_tun_node) (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * from_frame)
+{
+ return esp_decrypt_inline (vm, node, from_frame, 0, 1);
+}
+
+VLIB_NODE_FN (esp6_decrypt_node) (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * from_frame)
+{
+ return esp_decrypt_inline (vm, node, from_frame, 1, 0);
+}
+
+VLIB_NODE_FN (esp6_decrypt_tun_node) (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * from_frame)
+{
+ return esp_decrypt_inline (vm, node, from_frame, 1, 1);
}
/* *INDENT-OFF* */
VLIB_REGISTER_NODE (esp4_decrypt_node) = {
- .function = esp4_decrypt_node_fn,
.name = "esp4-decrypt",
.vector_size = sizeof (u32),
.format_trace = format_esp_decrypt_trace,
#undef _
},
};
-/* *INDENT-ON* */
-
-VLIB_NODE_FUNCTION_MULTIARCH (esp4_decrypt_node, esp4_decrypt_node_fn);
-static uword
-esp6_decrypt_node_fn (vlib_main_t * vm,
- vlib_node_runtime_t * node, vlib_frame_t * from_frame)
-{
- return esp_decrypt_inline (vm, node, from_frame, 1 /* is_ip6 */ );
-}
-
-/* *INDENT-OFF* */
VLIB_REGISTER_NODE (esp6_decrypt_node) = {
- .function = esp6_decrypt_node_fn,
.name = "esp6-decrypt",
.vector_size = sizeof (u32),
.format_trace = format_esp_decrypt_trace,
#undef _
},
};
+
+VLIB_REGISTER_NODE (esp4_decrypt_tun_node) = {
+ .name = "esp4-decrypt-tun",
+ .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,
+ .sibling_of = "esp4-decrypt",
+};
+
+VLIB_REGISTER_NODE (esp6_decrypt_tun_node) = {
+ .name = "esp6-decrypt-tun",
+ .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,
+ .sibling_of = "esp6-decrypt",
+};
/* *INDENT-ON* */
-VLIB_NODE_FUNCTION_MULTIARCH (esp6_decrypt_node, esp6_decrypt_node_fn);
/*
* fd.io coding-style-patch-verification: ON
*
Code Review / vpp.git / blobdiff