diff options
Diffstat (limited to 'src/vnet/ipsec/esp_decrypt.c')
| -rw-r--r-- | src/vnet/ipsec/esp_decrypt.c | 444 |
1 files changed, 369 insertions, 75 deletions
diff --git a/src/vnet/ipsec/esp_decrypt.c b/src/vnet/ipsec/esp_decrypt.c index 56724c00239..f29dacb3dc7 100644 --- a/src/vnet/ipsec/esp_decrypt.c +++ b/src/vnet/ipsec/esp_decrypt.c @@ -50,7 +50,7 @@ typedef enum _(CRYPTO_ENGINE_ERROR, "crypto engine error (packet dropped)") \ _(REPLAY, "SA replayed packet") \ _(RUNT, "undersized packet") \ - _(CHAINED_BUFFER, "chained buffers (packet dropped)") \ + _(NO_BUFFERS, "no 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") \ @@ -114,12 +114,130 @@ typedef struct i16 current_data; i16 current_length; u16 hdr_sz; + vlib_buffer_t *lb; + u32 free_buffer_index; + u8 icv_removed; } esp_decrypt_packet_data_t; -STATIC_ASSERT_SIZEOF (esp_decrypt_packet_data_t, 3 * sizeof (u64)); +STATIC_ASSERT_SIZEOF (esp_decrypt_packet_data_t, 5 * sizeof (u64)); #define ESP_ENCRYPT_PD_F_FD_TRANSPORT (1 << 2) +static_always_inline void +esp_process_ops (vlib_main_t * vm, vlib_node_runtime_t * node, + vnet_crypto_op_t * ops, vlib_buffer_t * b[], u16 * nexts, + int e) +{ + vnet_crypto_op_t *op = ops; + u32 n_fail, n_ops = vec_len (ops); + + if (n_ops == 0) + return; + + n_fail = n_ops - vnet_crypto_process_ops (vm, op, n_ops); + + while (n_fail) + { + ASSERT (op - ops < n_ops); + if (op->status != VNET_CRYPTO_OP_STATUS_COMPLETED) + { + u32 err, bi = op->user_data; + if (op->status == VNET_CRYPTO_OP_STATUS_FAIL_BAD_HMAC) + err = e; + else + err = ESP_DECRYPT_ERROR_CRYPTO_ENGINE_ERROR; + b[bi]->error = node->errors[err]; + nexts[bi] = ESP_DECRYPT_NEXT_DROP; + n_fail--; + } + op++; + } +} + +static_always_inline void +esp_process_chained_ops (vlib_main_t * vm, vlib_node_runtime_t * node, + vnet_crypto_op_t * ops, vlib_buffer_t * b[], + u16 * nexts, vnet_crypto_op_chunk_t * chunks, int e) +{ + + vnet_crypto_op_t *op = ops; + u32 n_fail, n_ops = vec_len (ops); + + if (n_ops == 0) + return; + + n_fail = n_ops - vnet_crypto_process_chained_ops (vm, op, chunks, n_ops); + + while (n_fail) + { + ASSERT (op - ops < n_ops); + if (op->status != VNET_CRYPTO_OP_STATUS_COMPLETED) + { + u32 err, bi = op->user_data; + if (op->status == VNET_CRYPTO_OP_STATUS_FAIL_BAD_HMAC) + err = e; + else + err = ESP_DECRYPT_ERROR_CRYPTO_ENGINE_ERROR; + b[bi]->error = node->errors[err]; + nexts[bi] = ESP_DECRYPT_NEXT_DROP; + n_fail--; + } + op++; + } +} + +always_inline void +esp_remove_tail (vlib_main_t * vm, vlib_buffer_t * b, vlib_buffer_t * last, + u16 tail) +{ + vlib_buffer_t *before_last = b; + + if (last->current_length > tail) + { + last->current_length -= tail; + return; + } + ASSERT (b->flags & VLIB_BUFFER_NEXT_PRESENT); + + while (b->flags & VLIB_BUFFER_NEXT_PRESENT) + { + before_last = b; + b = vlib_get_buffer (vm, b->next_buffer); + } + before_last->current_length -= tail - last->current_length; + vlib_buffer_free_one (vm, before_last->next_buffer); + before_last->flags &= ~VLIB_BUFFER_NEXT_PRESENT; +} + +/* ICV is splitted in last two buffers so move it to the last buffer and + return pointer to it */ +static_always_inline u8 * +esp_move_icv (vlib_main_t * vm, vlib_buffer_t * first, + esp_decrypt_packet_data_t * pd, u16 icv_sz) +{ + vlib_buffer_t *before_last, *bp; + u16 last_sz = pd->lb->current_length; + u16 first_sz = icv_sz - last_sz; + + bp = before_last = first; + while (bp->flags & VLIB_BUFFER_NEXT_PRESENT) + { + before_last = bp; + bp = vlib_get_buffer (vm, bp->next_buffer); + } + + u8 *lb_curr = vlib_buffer_get_current (pd->lb); + memmove (lb_curr + first_sz, lb_curr, last_sz); + clib_memcpy_fast (lb_curr, vlib_buffer_get_tail (before_last) - first_sz, + first_sz); + before_last->current_length -= first_sz; + pd->lb = before_last; + pd->icv_removed = 1; + pd->free_buffer_index = before_last->next_buffer; + before_last->flags &= ~VLIB_BUFFER_NEXT_PRESENT; + return lb_curr; +} + always_inline uword esp_decrypt_inline (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * from_frame, @@ -131,7 +249,7 @@ esp_decrypt_inline (vlib_main_t * 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; + u32 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; @@ -139,10 +257,16 @@ esp_decrypt_inline (vlib_main_t * vm, 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; + vnet_crypto_op_chunk_t *ch; + vnet_crypto_op_t **crypto_ops = &ptd->crypto_ops; + vnet_crypto_op_t **integ_ops = &ptd->integ_ops; vlib_get_buffers (vm, from, b, n_left); vec_reset_length (ptd->crypto_ops); vec_reset_length (ptd->integ_ops); + vec_reset_length (ptd->chained_crypto_ops); + vec_reset_length (ptd->chained_integ_ops); + vec_reset_length (ptd->chunks); clib_memset_u16 (nexts, -1, n_left); while (n_left > 0) @@ -159,9 +283,10 @@ esp_decrypt_inline (vlib_main_t * vm, CLIB_PREFETCH (p, CLIB_CACHE_LINE_BYTES, LOAD); } - if (vlib_buffer_chain_linearize (vm, b[0]) != 1) + u32 n_bufs = vlib_buffer_chain_linearize (vm, b[0]); + if (n_bufs == 0) { - b[0]->error = node->errors[ESP_DECRYPT_ERROR_CHAINED_BUFFER]; + b[0]->error = node->errors[ESP_DECRYPT_ERROR_NO_BUFFERS]; next[0] = ESP_DECRYPT_NEXT_DROP; goto next; } @@ -205,10 +330,26 @@ esp_decrypt_inline (vlib_main_t * vm, 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); + pd->free_buffer_index = 0; + pd->icv_removed = 0; + + pd->lb = b[0]; + if (n_bufs > 1) + { + /* find last buffer in the chain */ + while (pd->lb->flags & VLIB_BUFFER_NEXT_PRESENT) + pd->lb = vlib_get_buffer (vm, pd->lb->next_buffer); + + crypto_ops = &ptd->chained_crypto_ops; + integ_ops = &ptd->chained_integ_ops; + } + pd->current_length = b[0]->current_length; /* 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)) + /* Chained buffers can process ESN as a separate chunk */ + if (pd->lb == b[0] && ipsec_sa_is_set_USE_ESN (sa0) && cpd.icv_sz && + (pd->lb->current_data + pd->lb->current_length + 4 + > buffer_data_size)) { b[0]->error = node->errors[ESP_DECRYPT_ERROR_NO_TAIL_SPACE]; next[0] = ESP_DECRYPT_NEXT_DROP; @@ -232,12 +373,12 @@ esp_decrypt_inline (vlib_main_t * vm, len = pd->current_length - cpd.icv_sz; current_sa_pkts += 1; - current_sa_bytes += pd->current_length; + current_sa_bytes += vlib_buffer_length_in_chain (vm, b[0]); if (PREDICT_TRUE (sa0->integ_op_id != VNET_CRYPTO_OP_NONE)) { vnet_crypto_op_t *op; - vec_add2_aligned (ptd->integ_ops, op, 1, CLIB_CACHE_LINE_BYTES); + vec_add2_aligned (integ_ops[0], op, 1, CLIB_CACHE_LINE_BYTES); vnet_crypto_op_init (op, sa0->integ_op_id); op->key_index = sa0->integ_key_index; @@ -247,7 +388,100 @@ esp_decrypt_inline (vlib_main_t * vm, op->digest = payload + len; op->digest_len = cpd.icv_sz; op->len = len; - if (ipsec_sa_is_set_USE_ESN (sa0)) + + if (pd->lb != b[0]) + { + /* buffer is chained */ + vlib_buffer_t *cb = b[0]; + op->flags |= VNET_CRYPTO_OP_FLAG_CHAINED_BUFFERS; + op->chunk_index = vec_len (ptd->chunks); + + if (pd->lb->current_length < cpd.icv_sz) + op->digest = esp_move_icv (vm, b[0], pd, cpd.icv_sz); + else + op->digest = vlib_buffer_get_tail (pd->lb) - cpd.icv_sz; + + vec_add2 (ptd->chunks, ch, 1); + ch->len = pd->current_length; + ch->src = payload; + cb = vlib_get_buffer (vm, cb->next_buffer); + op->n_chunks = 1; + while (1) + { + vec_add2 (ptd->chunks, ch, 1); + op->n_chunks += 1; + ch->src = vlib_buffer_get_current (cb); + if (pd->lb == cb) + { + if (pd->icv_removed) + ch->len = cb->current_length; + else + ch->len = cb->current_length - cpd.icv_sz; + if (ipsec_sa_is_set_USE_ESN (sa0)) + { + u32 seq_hi = clib_host_to_net_u32 (sa0->seq_hi); + u8 tmp[ESP_MAX_ICV_SIZE], sz = sizeof (sa0->seq_hi); + u8 *esn; + vlib_buffer_t *tmp_b; + u16 space_left = vlib_buffer_space_left_at_end + (vm, pd->lb); + if (space_left < sz) + { + if (pd->icv_removed) + { + /* use pre-data area from the last bufer + that was removed from the chain */ + tmp_b = + vlib_get_buffer (vm, + pd->free_buffer_index); + esn = tmp_b->data - sz; + } + else + { + /* no space, need to allocate new buffer */ + u32 tmp_bi = 0; + vlib_buffer_alloc (vm, &tmp_bi, 1); + tmp_b = vlib_get_buffer (vm, tmp_bi); + esn = tmp_b->data; + pd->free_buffer_index = tmp_bi; + } + clib_memcpy_fast (esn, &seq_hi, sz); + + vec_add2 (ptd->chunks, ch, 1); + op->n_chunks += 1; + ch->src = esn; + ch->len = sz; + } + else + { + if (pd->icv_removed) + { + clib_memcpy_fast (vlib_buffer_get_tail + (pd->lb), &seq_hi, sz); + } + else + { + clib_memcpy_fast (tmp, op->digest, + ESP_MAX_ICV_SIZE); + clib_memcpy_fast (op->digest, &seq_hi, sz); + clib_memcpy_fast (op->digest + sz, tmp, + ESP_MAX_ICV_SIZE); + op->digest += sz; + } + ch->len += sz; + } + } + } + else + ch->len = cb->current_length; + + if (!(cb->flags & VLIB_BUFFER_NEXT_PRESENT)) + break; + + cb = vlib_get_buffer (vm, cb->next_buffer); + } + } + else if (ipsec_sa_is_set_USE_ESN (sa0)) { /* shift ICV by 4 bytes to insert ESN */ u32 seq_hi = clib_host_to_net_u32 (sa0->seq_hi); @@ -263,10 +497,10 @@ esp_decrypt_inline (vlib_main_t * vm, payload += esp_sz; len -= esp_sz; - if (sa0->crypto_enc_op_id != VNET_CRYPTO_OP_NONE) + if (sa0->crypto_dec_op_id != VNET_CRYPTO_OP_NONE) { vnet_crypto_op_t *op; - vec_add2_aligned (ptd->crypto_ops, op, 1, CLIB_CACHE_LINE_BYTES); + vec_add2_aligned (crypto_ops[0], 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; @@ -303,6 +537,61 @@ esp_decrypt_inline (vlib_main_t * vm, op->src = op->dst = payload += cpd.iv_sz; op->len = len - cpd.iv_sz; op->user_data = b - bufs; + + if (pd->lb != b[0]) + { + /* buffer is chained */ + vlib_buffer_t *cb = b[0]; + op->flags |= VNET_CRYPTO_OP_FLAG_CHAINED_BUFFERS; + op->chunk_index = vec_len (ptd->chunks); + vec_add2 (ptd->chunks, ch, 1); + ch->len = len - cpd.iv_sz + cpd.icv_sz; + ch->src = ch->dst = payload; + cb = vlib_get_buffer (vm, cb->next_buffer); + op->n_chunks = 1; + + while (1) + { + vec_add2 (ptd->chunks, ch, 1); + op->n_chunks += 1; + ch->src = ch->dst = vlib_buffer_get_current (cb); + if (pd->lb == cb) + { + if (ipsec_sa_is_set_IS_AEAD (sa0)) + { + if (pd->lb->current_length < cpd.icv_sz) + { + op->tag = + esp_move_icv (vm, b[0], pd, cpd.icv_sz); + + /* this chunk does not contain crypto data */ + op->n_chunks -= 1; + + /* and fix previous chunk's length as it might have + been changed */ + ASSERT (op->n_chunks > 0); + ch[-1].len = pd->lb->current_length; + break; + } + else + op->tag = + vlib_buffer_get_tail (pd->lb) - cpd.icv_sz; + } + + if (pd->icv_removed) + ch->len = cb->current_length; + else + ch->len = cb->current_length - cpd.icv_sz; + } + else + ch->len = cb->current_length; + + if (!(cb->flags & VLIB_BUFFER_NEXT_PRESENT)) + break; + + cb = vlib_get_buffer (vm, cb->next_buffer); + } + } } /* next */ @@ -318,52 +607,15 @@ esp_decrypt_inline (vlib_main_t * vm, current_sa_index, current_sa_pkts, current_sa_bytes); - 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) - { - 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--; - } - 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) - { - u32 err, bi; - - bi = op->user_data; - - if (op->status == VNET_CRYPTO_OP_STATUS_FAIL_BAD_HMAC) - err = ESP_DECRYPT_ERROR_DECRYPTION_FAILED; - else - err = ESP_DECRYPT_ERROR_CRYPTO_ENGINE_ERROR; + esp_process_ops (vm, node, ptd->integ_ops, bufs, nexts, + ESP_DECRYPT_ERROR_INTEG_ERROR); + esp_process_chained_ops (vm, node, ptd->chained_integ_ops, bufs, nexts, + ptd->chunks, ESP_DECRYPT_ERROR_INTEG_ERROR); - bufs[bi]->error = node->errors[err]; - nexts[bi] = ESP_DECRYPT_NEXT_DROP; - n--; - } - op++; - } - } + esp_process_ops (vm, node, ptd->crypto_ops, bufs, nexts, + ESP_DECRYPT_ERROR_DECRYPTION_FAILED); + esp_process_chained_ops (vm, node, ptd->chained_crypto_ops, bufs, nexts, + ptd->chunks, ESP_DECRYPT_ERROR_DECRYPTION_FAILED); /* Post decryption ronud - adjust packet data start and length and next node */ @@ -430,11 +682,51 @@ esp_decrypt_inline (vlib_main_t * vm, ipsec_sa_anti_replay_advance (sa0, pd->seq); - esp_footer_t *f = (esp_footer_t *) (b[0]->data + pd->current_data + - pd->current_length - sizeof (*f) - - pd->icv_sz); + u8 pad_length = 0, next_header = 0; + u16 icv_sz = pd->icv_removed ? 0 : pd->icv_sz; + + if (pd->free_buffer_index) + vlib_buffer_free_one (vm, pd->free_buffer_index); + + if (pd->lb->current_length < sizeof (esp_footer_t) + icv_sz) + { + /* esp footer is either splitted in two buffers or in the before + * last buffer */ + + vlib_buffer_t *before_last = b[0], *bp = b[0]; + while (bp->flags & VLIB_BUFFER_NEXT_PRESENT) + { + before_last = bp; + bp = vlib_get_buffer (vm, bp->next_buffer); + } + u8 *bt = vlib_buffer_get_tail (before_last); + + if (pd->lb->current_length == icv_sz) + { + esp_footer_t *f = (esp_footer_t *) (bt - sizeof (*f)); + pad_length = f->pad_length; + next_header = f->next_header; + } + else + { + pad_length = (bt - 1)[0]; + next_header = ((u8 *) vlib_buffer_get_current (pd->lb))[0]; + } + } + else + { + esp_footer_t *f = + (esp_footer_t *) (pd->lb->data + pd->lb->current_data + + pd->lb->current_length - sizeof (esp_footer_t) - + icv_sz); + pad_length = f->pad_length; + next_header = f->next_header; + } + u16 adv = pd->iv_sz + esp_sz; - u16 tail = sizeof (esp_footer_t) + f->pad_length + pd->icv_sz; + u16 tail = sizeof (esp_footer_t) + pad_length + icv_sz; + u16 tail_orig = sizeof (esp_footer_t) + pad_length + pd->icv_sz; + b[0]->flags &= ~VLIB_BUFFER_TOTAL_LENGTH_VALID; if ((pd->flags & tun_flags) == 0 && !is_tun) /* transport mode */ { @@ -450,15 +742,16 @@ esp_decrypt_inline (vlib_main_t * vm, 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; + b[0]->current_length = pd->current_length + ip_hdr_sz - adv; + esp_remove_tail (vm, b[0], pd->lb, tail); if (is_ip6) { ip6_header_t *ip6 = (ip6_header_t *) ip; u16 len = clib_net_to_host_u16 (ip6->payload_length); - len -= adv + tail; + len -= adv + tail_orig; ip6->payload_length = clib_host_to_net_u16 (len); - ip6->protocol = f->next_header; + ip6->protocol = next_header; next[0] = ESP_DECRYPT_NEXT_IP6_INPUT; } else @@ -466,34 +759,36 @@ esp_decrypt_inline (vlib_main_t * vm, 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, + len = clib_host_to_net_u16 (len - adv - tail_orig - udp_sz); + sum = ip_csum_update (sum, ip4->protocol, 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->protocol = next_header; ip4->length = len; next[0] = ESP_DECRYPT_NEXT_IP4_INPUT; } } else { - if (PREDICT_TRUE (f->next_header == IP_PROTOCOL_IP_IN_IP)) + if (PREDICT_TRUE (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; + b[0]->current_length = pd->current_length - adv; + esp_remove_tail (vm, b[0], pd->lb, tail); } - else if (f->next_header == IP_PROTOCOL_IPV6) + else if (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; + b[0]->current_length = pd->current_length - adv; + esp_remove_tail (vm, b[0], pd->lb, tail); } else { - if (is_tun && f->next_header == IP_PROTOCOL_GRE) + if (is_tun && next_header == IP_PROTOCOL_GRE) { gre_header_t *gre; @@ -555,7 +850,7 @@ esp_decrypt_inline (vlib_main_t * vm, itp = ipsec_tun_protect_get (vnet_buffer (b[0])->ipsec.protect_index); - if (PREDICT_TRUE (f->next_header == IP_PROTOCOL_IP_IN_IP)) + if (PREDICT_TRUE (next_header == IP_PROTOCOL_IP_IN_IP)) { const ip4_header_t *ip4; @@ -571,7 +866,7 @@ esp_decrypt_inline (vlib_main_t * vm, node->errors[ESP_DECRYPT_ERROR_TUN_NO_PROTO]; } } - else if (f->next_header == IP_PROTOCOL_IPV6) + else if (next_header == IP_PROTOCOL_IPV6) { const ip6_header_t *ip6; @@ -618,7 +913,6 @@ esp_decrypt_inline (vlib_main_t * vm, vlib_buffer_enqueue_to_next (vm, node, from, nexts, n_left); - b = bufs; return n_left; } |