X-Git-Url: https://gerrit.fd.io/r/gitweb?a=blobdiff_plain;f=src%2Fvnet%2Fipsec%2Fesp_decrypt.c;h=f5b6232dbd811761bec2222076018315bb58d64e;hb=4a58e49cf;hp=fc4a99a873d6d8226f2adb921647d47a607d6729;hpb=21ada3bd7e9bc5cca7c2c8399adcbaa044bf8103;p=vpp.git diff --git a/src/vnet/ipsec/esp_decrypt.c b/src/vnet/ipsec/esp_decrypt.c index fc4a99a873d..f5b6232dbd8 100644 --- a/src/vnet/ipsec/esp_decrypt.c +++ b/src/vnet/ipsec/esp_decrypt.c @@ -18,16 +18,22 @@ #include #include #include +#include #include #include #include +#include -#define foreach_esp_decrypt_next \ -_(DROP, "error-drop") \ -_(IP4_INPUT, "ip4-input-no-checksum") \ -_(IP6_INPUT, "ip6-input") \ -_(IPSEC_GRE_INPUT, "ipsec-gre-input") +#include + +#define foreach_esp_decrypt_next \ + _ (DROP, "error-drop") \ + _ (IP4_INPUT, "ip4-input-no-checksum") \ + _ (IP6_INPUT, "ip6-input") \ + _ (L2_INPUT, "l2-input") \ + _ (MPLS_INPUT, "mpls-input") \ + _ (HANDOFF, "handoff") #define _(v, s) ESP_DECRYPT_NEXT_##v, typedef enum @@ -37,16 +43,34 @@ typedef enum ESP_DECRYPT_N_NEXT, } esp_decrypt_next_t; +#define foreach_esp_decrypt_post_next \ + _ (DROP, "error-drop") \ + _ (IP4_INPUT, "ip4-input-no-checksum") \ + _ (IP6_INPUT, "ip6-input") \ + _ (MPLS_INPUT, "mpls-input") \ + _ (L2_INPUT, "l2-input") + +#define _(v, s) ESP_DECRYPT_POST_NEXT_##v, +typedef enum +{ + foreach_esp_decrypt_post_next +#undef _ + ESP_DECRYPT_POST_N_NEXT, +} esp_decrypt_post_next_t; #define foreach_esp_decrypt_error \ _(RX_PKTS, "ESP pkts received") \ + _(RX_POST_PKTS, "ESP-POST pkts received") \ _(DECRYPTION_FAILED, "ESP decryption failed") \ _(INTEG_ERROR, "Integrity check failed") \ _(CRYPTO_ENGINE_ERROR, "crypto engine error (packet dropped)") \ _(REPLAY, "SA replayed packet") \ - _(CHAINED_BUFFER, "chained buffers (packet dropped)") \ + _(RUNT, "undersized packet") \ + _(NO_BUFFERS, "no buffers (packet dropped)") \ _(OVERSIZED_HEADER, "buffer with oversized header (dropped)") \ - _(NO_TAIL_SPACE, "no enough buffer tail space (dropped)") + _(NO_TAIL_SPACE, "no enough buffer tail space (dropped)") \ + _(TUN_NO_PROTO, "no tunnel protocol") \ + _(UNSUP_PAYLOAD, "unsupported payload") \ typedef enum @@ -66,6 +90,8 @@ static char *esp_decrypt_error_strings[] = { 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; @@ -78,58 +104,962 @@ format_esp_decrypt_trace (u8 * s, va_list * args) 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 seq %u", - format_ipsec_crypto_alg, t->crypto_alg, - format_ipsec_integ_alg, t->integ_alg, t->seq); + 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; } -typedef struct +#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) { - union - { - struct + 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) { - u8 icv_sz; - u8 iv_sz; - ipsec_sa_flags_t flags:8; - u32 sa_index; - }; - u64 sa_data; - }; + 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++; + } +} - i16 current_data; - i16 current_length; - u16 hdr_sz; -} esp_decrypt_packet_data_t; +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) +{ -STATIC_ASSERT_SIZEOF (esp_decrypt_packet_data_t, 2 * sizeof (u64)); + vnet_crypto_op_t *op = ops; + u32 n_fail, n_ops = vec_len (ops); -#define ESP_ENCRYPT_PD_F_FD_TRANSPORT (1 << 2) + 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, + esp_decrypt_packet_data2_t * pd2, u16 icv_sz, u16 * dif) +{ + vlib_buffer_t *before_last, *bp; + u16 last_sz = pd2->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 (pd2->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; + if (before_last == first) + pd->current_length -= first_sz; + clib_memset (vlib_buffer_get_tail (before_last), 0, first_sz); + if (dif) + dif[0] = first_sz; + pd2->lb = before_last; + pd2->icv_removed = 1; + pd2->free_buffer_index = before_last->next_buffer; + before_last->flags &= ~VLIB_BUFFER_NEXT_PRESENT; + return lb_curr; +} + +static_always_inline i16 +esp_insert_esn (vlib_main_t * vm, ipsec_sa_t * sa, + esp_decrypt_packet_data2_t * pd2, u32 * data_len, + u8 ** digest, u16 * len, vlib_buffer_t * b, u8 * payload) +{ + if (!ipsec_sa_is_set_USE_ESN (sa)) + return 0; + + /* shift ICV by 4 bytes to insert ESN */ + u32 seq_hi = clib_host_to_net_u32 (sa->seq_hi); + u8 tmp[ESP_MAX_ICV_SIZE], sz = sizeof (sa->seq_hi); + + if (pd2->icv_removed) + { + u16 space_left = vlib_buffer_space_left_at_end (vm, pd2->lb); + if (space_left >= sz) + { + clib_memcpy_fast (vlib_buffer_get_tail (pd2->lb), &seq_hi, sz); + *data_len += sz; + } + else + return sz; + + len[0] = b->current_length; + } + else + { + clib_memcpy_fast (tmp, payload + len[0], ESP_MAX_ICV_SIZE); + clib_memcpy_fast (payload + len[0], &seq_hi, sz); + clib_memcpy_fast (payload + len[0] + sz, tmp, ESP_MAX_ICV_SIZE); + *data_len += sz; + *digest += sz; + } + return sz; +} + +static_always_inline u8 * +esp_move_icv_esn (vlib_main_t * vm, vlib_buffer_t * first, + esp_decrypt_packet_data_t * pd, + esp_decrypt_packet_data2_t * pd2, u16 icv_sz, + ipsec_sa_t * sa, u8 * extra_esn, u32 * len) +{ + u16 dif = 0; + u8 *digest = esp_move_icv (vm, first, pd, pd2, icv_sz, &dif); + if (dif) + *len -= dif; + + if (ipsec_sa_is_set_USE_ESN (sa)) + { + u8 sz = sizeof (sa->seq_hi); + u32 seq_hi = clib_host_to_net_u32 (sa->seq_hi); + u16 space_left = vlib_buffer_space_left_at_end (vm, pd2->lb); + + if (space_left >= sz) + { + clib_memcpy_fast (vlib_buffer_get_tail (pd2->lb), &seq_hi, sz); + *len += sz; + } + else + { + /* no space for ESN at the tail, use the next buffer + * (with ICV data) */ + ASSERT (pd2->icv_removed); + vlib_buffer_t *tmp = vlib_get_buffer (vm, pd2->free_buffer_index); + clib_memcpy_fast (vlib_buffer_get_current (tmp) - sz, &seq_hi, sz); + extra_esn[0] = 1; + } + } + return digest; +} + +static_always_inline int +esp_decrypt_chain_integ (vlib_main_t * vm, ipsec_per_thread_data_t * ptd, + esp_decrypt_packet_data2_t * pd2, + ipsec_sa_t * sa0, vlib_buffer_t * b, u8 icv_sz, + u8 * start_src, u32 start_len, + u8 ** digest, u16 * n_ch, u32 * integ_total_len) +{ + vnet_crypto_op_chunk_t *ch; + vlib_buffer_t *cb = vlib_get_buffer (vm, b->next_buffer); + u16 n_chunks = 1; + u32 total_len; + vec_add2 (ptd->chunks, ch, 1); + total_len = ch->len = start_len; + ch->src = start_src; + + while (1) + { + vec_add2 (ptd->chunks, ch, 1); + n_chunks += 1; + ch->src = vlib_buffer_get_current (cb); + if (pd2->lb == cb) + { + if (pd2->icv_removed) + ch->len = cb->current_length; + else + ch->len = cb->current_length - 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, pd2->lb); + if (space_left < sz) + { + if (pd2->icv_removed) + { + /* use pre-data area from the last bufer + that was removed from the chain */ + tmp_b = vlib_get_buffer (vm, pd2->free_buffer_index); + esn = tmp_b->data - sz; + } + else + { + /* no space, need to allocate new buffer */ + u32 tmp_bi = 0; + if (vlib_buffer_alloc (vm, &tmp_bi, 1) != 1) + return -1; + tmp_b = vlib_get_buffer (vm, tmp_bi); + esn = tmp_b->data; + pd2->free_buffer_index = tmp_bi; + } + clib_memcpy_fast (esn, &seq_hi, sz); + + vec_add2 (ptd->chunks, ch, 1); + n_chunks += 1; + ch->src = esn; + ch->len = sz; + } + else + { + if (pd2->icv_removed) + { + clib_memcpy_fast (vlib_buffer_get_tail + (pd2->lb), &seq_hi, sz); + } + else + { + clib_memcpy_fast (tmp, *digest, ESP_MAX_ICV_SIZE); + clib_memcpy_fast (*digest, &seq_hi, sz); + clib_memcpy_fast (*digest + sz, tmp, ESP_MAX_ICV_SIZE); + *digest += sz; + } + ch->len += sz; + } + } + total_len += ch->len; + break; + } + else + total_len += ch->len = cb->current_length; + + if (!(cb->flags & VLIB_BUFFER_NEXT_PRESENT)) + break; + + cb = vlib_get_buffer (vm, cb->next_buffer); + } + + if (n_ch) + *n_ch = n_chunks; + if (integ_total_len) + *integ_total_len = total_len; + + return 0; +} + +static_always_inline u32 +esp_decrypt_chain_crypto (vlib_main_t * vm, ipsec_per_thread_data_t * ptd, + esp_decrypt_packet_data_t * pd, + esp_decrypt_packet_data2_t * pd2, + ipsec_sa_t * sa0, vlib_buffer_t * b, u8 icv_sz, + u8 * start, u32 start_len, u8 ** tag, u16 * n_ch) +{ + vnet_crypto_op_chunk_t *ch; + vlib_buffer_t *cb = b; + u16 n_chunks = 1; + u32 total_len; + vec_add2 (ptd->chunks, ch, 1); + total_len = ch->len = start_len; + ch->src = ch->dst = start; + cb = vlib_get_buffer (vm, cb->next_buffer); + n_chunks = 1; + + while (1) + { + vec_add2 (ptd->chunks, ch, 1); + n_chunks += 1; + ch->src = ch->dst = vlib_buffer_get_current (cb); + if (pd2->lb == cb) + { + if (ipsec_sa_is_set_IS_AEAD (sa0)) + { + if (pd2->lb->current_length < icv_sz) + { + u16 dif = 0; + *tag = esp_move_icv (vm, b, pd, pd2, icv_sz, &dif); + + /* this chunk does not contain crypto data */ + n_chunks -= 1; + /* and fix previous chunk's length as it might have + been changed */ + ASSERT (n_chunks > 0); + if (pd2->lb == b) + { + total_len -= dif; + ch[-1].len -= dif; + } + else + { + total_len = total_len + pd2->lb->current_length - + ch[-1].len; + ch[-1].len = pd2->lb->current_length; + } + break; + } + else + *tag = vlib_buffer_get_tail (pd2->lb) - icv_sz; + } + + if (pd2->icv_removed) + total_len += ch->len = cb->current_length; + else + total_len += ch->len = cb->current_length - icv_sz; + } + else + total_len += ch->len = cb->current_length; + + if (!(cb->flags & VLIB_BUFFER_NEXT_PRESENT)) + break; + + cb = vlib_get_buffer (vm, cb->next_buffer); + } + + if (n_ch) + *n_ch = n_chunks; + + return total_len; +} + +static_always_inline void +esp_decrypt_prepare_sync_op (vlib_main_t * vm, vlib_node_runtime_t * node, + ipsec_per_thread_data_t * ptd, + vnet_crypto_op_t *** crypto_ops, + vnet_crypto_op_t *** integ_ops, + vnet_crypto_op_t * op, + ipsec_sa_t * sa0, u8 * payload, + u16 len, u8 icv_sz, u8 iv_sz, + esp_decrypt_packet_data_t * pd, + esp_decrypt_packet_data2_t * pd2, + vlib_buffer_t * b, u16 * next, u32 index) +{ + const u8 esp_sz = sizeof (esp_header_t); + + if (PREDICT_TRUE (sa0->integ_op_id != VNET_CRYPTO_OP_NONE)) + { + 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 = index; + op->digest = payload + len; + op->digest_len = icv_sz; + op->len = len; + + if (pd->is_chain) + { + /* buffer is chained */ + op->len = pd->current_length; + + /* special case when ICV is splitted and needs to be reassembled + * first -> move it to the last buffer. Also take into account + * that ESN needs to be added after encrypted data and may or + * may not fit in the tail.*/ + if (pd2->lb->current_length < icv_sz) + { + u8 extra_esn = 0; + op->digest = + esp_move_icv_esn (vm, b, pd, pd2, icv_sz, sa0, + &extra_esn, &op->len); + + if (extra_esn) + { + /* esn is in the last buffer, that was unlinked from + * the chain */ + op->len = b->current_length; + } + else + { + if (pd2->lb == b) + { + /* we now have a single buffer of crypto data, adjust + * the length (second buffer contains only ICV) */ + *integ_ops = &ptd->integ_ops; + *crypto_ops = &ptd->crypto_ops; + len = b->current_length; + goto out; + } + } + } + else + op->digest = vlib_buffer_get_tail (pd2->lb) - icv_sz; + + op->flags |= VNET_CRYPTO_OP_FLAG_CHAINED_BUFFERS; + op->chunk_index = vec_len (ptd->chunks); + if (esp_decrypt_chain_integ (vm, ptd, pd2, sa0, b, icv_sz, + payload, pd->current_length, + &op->digest, &op->n_chunks, 0) < 0) + { + b->error = node->errors[ESP_DECRYPT_ERROR_NO_BUFFERS]; + next[0] = ESP_DECRYPT_NEXT_DROP; + return; + } + } + else + esp_insert_esn (vm, sa0, pd2, &op->len, &op->digest, &len, b, + payload); + out: + vec_add_aligned (*(integ_ops[0]), op, 1, CLIB_CACHE_LINE_BYTES); + } + + payload += esp_sz; + len -= esp_sz; + + if (sa0->crypto_dec_op_id != VNET_CRYPTO_OP_NONE) + { + 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; + + op->aad_len = esp_aad_fill (op->aad, 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 += iv_sz; + op->len = len - iv_sz; + op->user_data = index; + + if (pd->is_chain && (pd2->lb != b)) + { + /* buffer is chained */ + op->flags |= VNET_CRYPTO_OP_FLAG_CHAINED_BUFFERS; + op->chunk_index = vec_len (ptd->chunks); + esp_decrypt_chain_crypto (vm, ptd, pd, pd2, sa0, b, icv_sz, + payload, len - pd->iv_sz + pd->icv_sz, + &op->tag, &op->n_chunks); + } + + vec_add_aligned (*(crypto_ops[0]), op, 1, CLIB_CACHE_LINE_BYTES); + } +} + +static_always_inline int +esp_decrypt_prepare_async_frame (vlib_main_t * vm, + vlib_node_runtime_t * node, + ipsec_per_thread_data_t * ptd, + vnet_crypto_async_frame_t ** f, + ipsec_sa_t * sa0, u8 * payload, u16 len, + u8 icv_sz, u8 iv_sz, + esp_decrypt_packet_data_t * pd, + esp_decrypt_packet_data2_t * pd2, u32 bi, + vlib_buffer_t * b, u16 * next, + u16 async_next) +{ + const u8 esp_sz = sizeof (esp_header_t); + u32 current_protect_index = vnet_buffer (b)->ipsec.protect_index; + esp_decrypt_packet_data_t *async_pd = &(esp_post_data (b))->decrypt_data; + esp_decrypt_packet_data2_t *async_pd2 = esp_post_data2 (b); + u8 *tag = payload + len, *iv = payload + esp_sz, *aad = 0; + u32 key_index; + u32 crypto_len, integ_len = 0; + i16 crypto_start_offset, integ_start_offset = 0; + u8 flags = 0; + + if (!ipsec_sa_is_set_IS_AEAD (sa0)) + { + /* linked algs */ + key_index = sa0->linked_key_index; + integ_start_offset = payload - b->data; + integ_len = len; + + if (pd->is_chain) + { + /* buffer is chained */ + integ_len = pd->current_length; + + /* special case when ICV is splitted and needs to be reassembled + * first -> move it to the last buffer. Also take into account + * that ESN needs to be added after encrypted data and may or + * may not fit in the tail.*/ + if (pd2->lb->current_length < icv_sz) + { + u8 extra_esn = 0; + tag = esp_move_icv_esn (vm, b, pd, pd2, icv_sz, sa0, + &extra_esn, &integ_len); + + if (extra_esn) + { + /* esn is in the last buffer, that was unlinked from + * the chain */ + integ_len = b->current_length; + } + else + { + if (pd2->lb == b) + { + /* we now have a single buffer of crypto data, adjust + * the length (second buffer contains only ICV) */ + len = b->current_length; + goto out; + } + } + } + else + tag = vlib_buffer_get_tail (pd2->lb) - icv_sz; + + flags |= VNET_CRYPTO_OP_FLAG_CHAINED_BUFFERS; + if (esp_decrypt_chain_integ (vm, ptd, pd2, sa0, b, icv_sz, payload, + pd->current_length, &tag, + 0, &integ_len) < 0) + { + /* allocate buffer failed, will not add to frame and drop */ + b->error = node->errors[ESP_DECRYPT_ERROR_NO_BUFFERS]; + next[0] = ESP_DECRYPT_NEXT_DROP; + return -1; + } + } + else + esp_insert_esn (vm, sa0, pd2, &integ_len, &tag, &len, b, payload); + } + else + key_index = sa0->crypto_key_index; + +out: + /* crypto */ + payload += esp_sz; + len -= esp_sz; + iv = payload; + + if (ipsec_sa_is_set_IS_AEAD (sa0)) + { + esp_header_t *esp0; + 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 (esp_aead_t) + pd->hdr_sz); + aad = scratch; + + esp_aad_fill (aad, 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) + */ + iv -= sizeof (sa0->salt); + clib_memcpy_fast (iv, &sa0->salt, sizeof (sa0->salt)); + + tag = payload + len; + } + + crypto_start_offset = (payload += iv_sz) - b->data; + crypto_len = len - iv_sz; + + if (pd->is_chain && (pd2->lb != b)) + { + /* buffer is chained */ + flags |= VNET_CRYPTO_OP_FLAG_CHAINED_BUFFERS; + + crypto_len = esp_decrypt_chain_crypto (vm, ptd, pd, pd2, sa0, b, icv_sz, + payload, + len - pd->iv_sz + pd->icv_sz, + &tag, 0); + } + + *async_pd = *pd; + *async_pd2 = *pd2; + pd->protect_index = current_protect_index; + + /* for AEAD integ_len - crypto_len will be negative, it is ok since it + * is ignored by the engine. */ + return vnet_crypto_async_add_to_frame (vm, f, key_index, crypto_len, + integ_len - crypto_len, + crypto_start_offset, + integ_start_offset, + bi, async_next, iv, tag, aad, flags); +} + +static_always_inline void +esp_decrypt_post_crypto (vlib_main_t * vm, vlib_node_runtime_t * node, + esp_decrypt_packet_data_t * pd, + esp_decrypt_packet_data2_t * pd2, vlib_buffer_t * b, + u16 * next, int is_ip6, int is_tun, int is_async) +{ + ipsec_main_t *im = &ipsec_main; + ipsec_sa_t *sa0 = vec_elt_at_index (im->sad, pd->sa_index); + vlib_buffer_t *lb = b; + const u8 esp_sz = sizeof (esp_header_t); + const u8 tun_flags = IPSEC_SA_FLAG_IS_TUNNEL | IPSEC_SA_FLAG_IS_TUNNEL_V6; + u8 pad_length = 0, next_header = 0; + u16 icv_sz; + + /* + * 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->error = node->errors[ESP_DECRYPT_ERROR_REPLAY]; + next[0] = ESP_DECRYPT_NEXT_DROP; + return; + } + + ipsec_sa_anti_replay_advance (sa0, pd->seq); + + if (pd->is_chain) + { + lb = pd2->lb; + icv_sz = pd2->icv_removed ? 0 : pd->icv_sz; + if (pd2->free_buffer_index) + { + vlib_buffer_free_one (vm, pd2->free_buffer_index); + lb->next_buffer = 0; + } + if (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, *bp = b; + 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 (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 (lb))[0]; + } + } + else + { + esp_footer_t *f = + (esp_footer_t *) (lb->data + lb->current_data + + lb->current_length - sizeof (esp_footer_t) - + icv_sz); + pad_length = f->pad_length; + next_header = f->next_header; + } + } + else + { + icv_sz = pd->icv_sz; + esp_footer_t *f = + (esp_footer_t *) (lb->data + lb->current_data + 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) + pad_length + icv_sz; + u16 tail_orig = sizeof (esp_footer_t) + pad_length + pd->icv_sz; + b->flags &= ~VLIB_BUFFER_TOTAL_LENGTH_VALID; + + 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->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->current_data = pd->current_data + adv - ip_hdr_sz; + b->current_length += ip_hdr_sz - adv; + esp_remove_tail (vm, b, 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_orig; + ip6->payload_length = clib_host_to_net_u16 (len); + ip6->protocol = next_header; + next[0] = ESP_DECRYPT_NEXT_IP6_INPUT; + } + else + { + 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_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 = next_header; + ip4->length = len; + next[0] = ESP_DECRYPT_NEXT_IP4_INPUT; + } + } + else + { + if (PREDICT_TRUE (next_header == IP_PROTOCOL_IP_IN_IP)) + { + next[0] = ESP_DECRYPT_NEXT_IP4_INPUT; + b->current_data = pd->current_data + adv; + b->current_length = pd->current_length - adv; + esp_remove_tail (vm, b, lb, tail); + } + else if (next_header == IP_PROTOCOL_IPV6) + { + next[0] = ESP_DECRYPT_NEXT_IP6_INPUT; + b->current_data = pd->current_data + adv; + b->current_length = pd->current_length - adv; + esp_remove_tail (vm, b, lb, tail); + } + else if (next_header == IP_PROTOCOL_MPLS_IN_IP) + { + next[0] = ESP_DECRYPT_NEXT_MPLS_INPUT; + b->current_data = pd->current_data + adv; + b->current_length = pd->current_length - adv; + esp_remove_tail (vm, b, lb, tail); + } + else + { + if (is_tun && next_header == IP_PROTOCOL_GRE) + { + gre_header_t *gre; + + b->current_data = pd->current_data + adv; + b->current_length = pd->current_length - adv - tail; + + gre = vlib_buffer_get_current (b); + + vlib_buffer_advance (b, sizeof (*gre)); + + switch (clib_net_to_host_u16 (gre->protocol)) + { + case GRE_PROTOCOL_teb: + vnet_update_l2_len (b); + next[0] = ESP_DECRYPT_NEXT_L2_INPUT; + break; + case GRE_PROTOCOL_ip4: + next[0] = ESP_DECRYPT_NEXT_IP4_INPUT; + break; + case GRE_PROTOCOL_ip6: + next[0] = ESP_DECRYPT_NEXT_IP6_INPUT; + break; + default: + b->error = node->errors[ESP_DECRYPT_ERROR_UNSUP_PAYLOAD]; + next[0] = ESP_DECRYPT_NEXT_DROP; + break; + } + } + else + { + next[0] = ESP_DECRYPT_NEXT_DROP; + b->error = node->errors[ESP_DECRYPT_ERROR_UNSUP_PAYLOAD]; + return; + } + } + if (is_tun) + { + if (ipsec_sa_is_set_IS_PROTECT (sa0)) + { + /* + * There are two encap possibilities + * 1) the tunnel and ths SA are prodiving encap, i.e. it's + * MAC | SA-IP | TUN-IP | ESP | PAYLOAD + * implying the SA is in tunnel mode (on a tunnel interface) + * 2) only the tunnel provides encap + * MAC | TUN-IP | ESP | PAYLOAD + * implying the SA is in transport mode. + * + * For 2) we need only strip the tunnel encap and we're good. + * since the tunnel and crypto ecnap (int the tun=protect + * object) are the same and we verified above that these match + * for 1) we need to strip the SA-IP outer headers, to + * reveal the tunnel IP and then check that this matches + * the configured tunnel. + */ + const ipsec_tun_protect_t *itp; + + if (is_async) + itp = ipsec_tun_protect_get (pd->protect_index); + else + itp = + ipsec_tun_protect_get (vnet_buffer (b)-> + ipsec.protect_index); + + if (PREDICT_TRUE (next_header == IP_PROTOCOL_IP_IN_IP)) + { + const ip4_header_t *ip4; + + ip4 = vlib_buffer_get_current (b); + + 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->error = node->errors[ESP_DECRYPT_ERROR_TUN_NO_PROTO]; + } + } + else if (next_header == IP_PROTOCOL_IPV6) + { + const ip6_header_t *ip6; + + ip6 = vlib_buffer_get_current (b); + + 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->error = node->errors[ESP_DECRYPT_ERROR_TUN_NO_PROTO]; + } + } + } + } + } +} 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, u16 async_next) { ipsec_main_t *im = &ipsec_main; 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; + 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; + esp_decrypt_packet_data2_t pkt_data2[VLIB_FRAME_SIZE], *pd2 = pkt_data2; 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; + vnet_crypto_op_t _op, *op = &_op; + vnet_crypto_op_t **crypto_ops = &ptd->crypto_ops; + vnet_crypto_op_t **integ_ops = &ptd->integ_ops; + vnet_crypto_async_frame_t *async_frame = 0; + int is_async = im->async_mode; + vnet_crypto_async_op_id_t last_async_op = ~0; + u16 n_async_drop = 0; vlib_get_buffers (vm, from, b, n_left); - vec_reset_length (ptd->crypto_ops); - vec_reset_length (ptd->integ_ops); + if (!is_async) + { + 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) @@ -146,155 +1076,191 @@ 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]; + esp_set_next_index (is_async, from, nexts, from[b - bufs], + &n_async_drop, ESP_DECRYPT_NEXT_DROP, next); next[0] = ESP_DECRYPT_NEXT_DROP; goto next; } 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); + + /* fetch the second cacheline ASAP */ + CLIB_PREFETCH (sa0->cacheline1, CLIB_CACHE_LINE_BYTES, LOAD); cpd.icv_sz = sa0->integ_icv_size; cpd.iv_sz = sa0->crypto_iv_size; cpd.flags = sa0->flags; cpd.sa_index = current_sa_index; - vlib_increment_combined_counter (&ipsec_sa_counters, thread_index, - current_sa_index, current_sa_pkts, - current_sa_bytes); + /* submit frame when op_id is different then the old one */ + if (is_async && last_async_op != sa0->crypto_async_dec_op_id) + { + if (async_frame && async_frame->n_elts) + { + if (vnet_crypto_async_submit_open_frame (vm, async_frame)) + esp_async_recycle_failed_submit (async_frame, b, from, + nexts, &n_async_drop, + ESP_DECRYPT_NEXT_DROP, + ESP_DECRYPT_ERROR_CRYPTO_ENGINE_ERROR); + } + async_frame = + vnet_crypto_async_get_frame (vm, sa0->crypto_async_dec_op_id); + last_async_op = sa0->crypto_async_dec_op_id; + } + } - current_sa_bytes = current_sa_pkts = 0; + if (PREDICT_FALSE (~0 == sa0->decrypt_thread_index)) + { + /* this is the first packet to use this SA, claim the SA + * for this thread. this could happen simultaneously on + * another thread */ + clib_atomic_cmp_and_swap (&sa0->decrypt_thread_index, ~0, + ipsec_sa_assign_thread (thread_index)); + } + + if (PREDICT_FALSE (thread_index != sa0->decrypt_thread_index)) + { + esp_set_next_index (is_async, from, nexts, from[b - bufs], + &n_async_drop, ESP_DECRYPT_NEXT_HANDOFF, next); + next[0] = ESP_DECRYPT_NEXT_HANDOFF; + goto next; } /* 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); + pd->is_chain = 0; + pd2->lb = b[0]; + pd2->free_buffer_index = 0; + pd2->icv_removed = 0; - /* we need 4 extra bytes for HMAC calculation when ESN are used */ - if ((sa0->flags & IPSEC_SA_FLAG_USE_ESN) && pd->icv_sz && - (pd->current_data + pd->current_length + 4 > buffer_data_size)) + if (n_bufs > 1) { - b[0]->error = node->errors[ESP_DECRYPT_ERROR_NO_TAIL_SPACE]; - next[0] = ESP_DECRYPT_NEXT_DROP; - goto next; + pd->is_chain = 1; + /* find last buffer in the chain */ + while (pd2->lb->flags & VLIB_BUFFER_NEXT_PRESENT) + pd2->lb = vlib_get_buffer (vm, pd2->lb->next_buffer); + + crypto_ops = &ptd->chained_crypto_ops; + integ_ops = &ptd->chained_integ_ops; } + pd->current_length = b[0]->current_length; + /* anti-reply check */ - if (ipsec_sa_anti_replay_check (sa0, &((esp_header_t *) payload)->seq)) + if (ipsec_sa_anti_replay_check (sa0, pd->seq)) { b[0]->error = node->errors[ESP_DECRYPT_ERROR_REPLAY]; - next[0] = ESP_DECRYPT_NEXT_DROP; + esp_set_next_index (is_async, from, nexts, from[b - bufs], + &n_async_drop, ESP_DECRYPT_NEXT_DROP, next); goto next; } - len = pd->current_length - cpd.icv_sz; - current_sa_pkts += 1; - current_sa_bytes += pd->current_length; - - if (PREDICT_TRUE (cpd.icv_sz > 0)) - { - 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 = sa0->integ_key.data; - op->key_len = sa0->integ_key.len; - 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 (PREDICT_TRUE (sa0->flags & IPSEC_SA_FLAG_USE_ESN)) - { - /* shift ICV for 4 bytes to insert ESN */ - 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, &sa0->seq_hi, sz); - clib_memcpy_fast (payload + len + sz, tmp, ESP_MAX_ICV_SIZE); - op->len += sz; - op->dst += sz; - } + if (pd->current_length < cpd.icv_sz + esp_sz + cpd.iv_sz) + { + b[0]->error = node->errors[ESP_DECRYPT_ERROR_RUNT]; + esp_set_next_index (is_async, from, nexts, from[b - bufs], + &n_async_drop, ESP_DECRYPT_NEXT_DROP, next); + goto next; } - payload += esp_sz; - len -= esp_sz; + len = pd->current_length - cpd.icv_sz; + current_sa_pkts += 1; + current_sa_bytes += vlib_buffer_length_in_chain (vm, b[0]); - if (sa0->crypto_enc_op_id != VNET_CRYPTO_OP_NONE) + if (is_async) { - 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 = sa0->crypto_key.data; - op->iv = payload; - op->src = op->dst = payload += cpd.iv_sz; - op->len = len; - op->user_data = b - bufs; + int ret = esp_decrypt_prepare_async_frame (vm, node, ptd, + &async_frame, + sa0, payload, len, + cpd.icv_sz, + cpd.iv_sz, + pd, pd2, + from[b - bufs], + b[0], next, async_next); + if (PREDICT_FALSE (ret < 0)) + { + b[0]->error = ESP_DECRYPT_ERROR_CRYPTO_ENGINE_ERROR; + esp_set_next_index (1, from, nexts, from[b - bufs], + &n_async_drop, ESP_DECRYPT_NEXT_DROP, next); + /* when next[0] is ESP_DECRYPT_NEXT_DROP we only have to drop + * the current packet. Otherwise it is frame submission error + * thus we have to drop the whole frame. + */ + if (next[0] != ESP_DECRYPT_NEXT_DROP && async_frame->n_elts) + esp_async_recycle_failed_submit (async_frame, b, from, + nexts, &n_async_drop, + ESP_DECRYPT_NEXT_DROP, + ESP_DECRYPT_ERROR_CRYPTO_ENGINE_ERROR); + goto next; + } } - + else + esp_decrypt_prepare_sync_op (vm, node, ptd, &crypto_ops, &integ_ops, + op, sa0, payload, len, cpd.icv_sz, + cpd.iv_sz, pd, pd2, b[0], next, + b - bufs); /* next */ next: n_left -= 1; next += 1; pd += 1; + pd2 += 1; b += 1; } - vlib_increment_combined_counter (&ipsec_sa_counters, thread_index, - current_sa_index, current_sa_pkts, - current_sa_bytes); + if (PREDICT_TRUE (~0 != current_sa_index)) + vlib_increment_combined_counter (&ipsec_sa_counters, thread_index, + current_sa_index, current_sa_pkts, + current_sa_bytes); - if ((n = vec_len (ptd->integ_ops))) + if (is_async) { - vnet_crypto_op_t *op = ptd->integ_ops; - n -= vnet_crypto_process_ops (vm, op, n); - while (n) + if (async_frame && async_frame->n_elts) { - 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 (vnet_crypto_async_submit_open_frame (vm, async_frame) < 0) + esp_async_recycle_failed_submit (async_frame, b, from, nexts, + &n_async_drop, + ESP_DECRYPT_NEXT_DROP, + ESP_DECRYPT_ERROR_CRYPTO_ENGINE_ERROR); } - } - 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; + /* no post process in async */ + vlib_node_increment_counter (vm, node->node_index, + ESP_DECRYPT_ERROR_RX_PKTS, n_left); + if (n_async_drop) + vlib_buffer_enqueue_to_next (vm, node, from, nexts, n_async_drop); - if (op->status == VNET_CRYPTO_OP_STATUS_FAIL_BAD_HMAC) - err = ESP_DECRYPT_ERROR_DECRYPTION_FAILED; - else - err = ESP_DECRYPT_ERROR_CRYPTO_ENGINE_ERROR; - - bufs[bi]->error = node->errors[err]; - nexts[bi] = ESP_DECRYPT_NEXT_DROP; - n--; - } - op++; - } + return n_left; + } + else + { + 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); + + 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 @@ -303,13 +1269,11 @@ esp_decrypt_inline (vlib_main_t * vm, n_left = from_frame->n_vectors; next = nexts; pd = pkt_data; + pd2 = pkt_data2; b = bufs; while (n_left) { - const u8 tun_flags = IPSEC_SA_FLAG_IS_TUNNEL | - IPSEC_SA_FLAG_IS_TUNNEL_V6; - if (n_left >= 2) { void *data = b[1]->data + pd[1].current_data; @@ -326,112 +1290,104 @@ esp_decrypt_inline (vlib_main_t * vm, CLIB_CACHE_LINE_BYTES * 2, LOAD); } - if (next[0] < ESP_DECRYPT_N_NEXT) - goto trace; + /* save the sa_index as GRE_teb post_crypto changes L2 opaque */ + if (PREDICT_FALSE (b[0]->flags & VLIB_BUFFER_IS_TRACED)) + current_sa_index = vnet_buffer (b[0])->ipsec.sad_index; - sa0 = vec_elt_at_index (im->sad, pd->sa_index); - u8 *payload = b[0]->data + pd->current_data; + if (next[0] >= ESP_DECRYPT_N_NEXT) + esp_decrypt_post_crypto (vm, node, pd, pd2, b[0], next, is_ip6, + is_tun, 0); - ipsec_sa_anti_replay_advance (sa0, &((esp_header_t *) payload)->seq); + /* 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, current_sa_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; + } - 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; + /* next */ + n_left -= 1; + next += 1; + pd += 1; + pd2 += 1; + b += 1; + } - if ((pd->flags & tun_flags) == 0) /* 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; + n_left = from_frame->n_vectors; + vlib_node_increment_counter (vm, node->node_index, + ESP_DECRYPT_ERROR_RX_PKTS, n_left); - if (is_ip6 && ip_hdr_sz > 64) - memmove (ip, old_ip, ip_hdr_sz); - else - clib_memcpy_le64 (ip, old_ip, ip_hdr_sz); + vlib_buffer_enqueue_to_next (vm, node, from, nexts, n_left); - b[0]->current_data = pd->current_data + adv - ip_hdr_sz; - b[0]->current_length = pd->current_length + ip_hdr_sz - tail - adv; + return n_left; +} - 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 - { - 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; - } +always_inline uword +esp_decrypt_post_inline (vlib_main_t * vm, + vlib_node_runtime_t * node, + vlib_frame_t * from_frame, int is_ip6, int is_tun) +{ + ipsec_main_t *im = &ipsec_main; + u32 *from = vlib_frame_vector_args (from_frame); + u32 n_left = from_frame->n_vectors; + vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b = bufs; + u16 nexts[VLIB_FRAME_SIZE], *next = nexts; + vlib_get_buffers (vm, from, b, n_left); + + while (n_left > 0) + { + esp_decrypt_packet_data_t *pd = &(esp_post_data (b[0]))->decrypt_data; + + if (n_left > 2) + { + vlib_prefetch_buffer_header (b[2], LOAD); + vlib_prefetch_buffer_header (b[1], LOAD); } + + if (!pd->is_chain) + esp_decrypt_post_crypto (vm, node, pd, 0, b[0], next, is_ip6, is_tun, + 1); 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]; - } + esp_decrypt_packet_data2_t *pd2 = esp_post_data2 (b[0]); + esp_decrypt_post_crypto (vm, node, pd, pd2, b[0], next, is_ip6, + is_tun, 1); } - if (PREDICT_FALSE (ipsec_sa_is_set_IS_GRE (sa0))) - next[0] = ESP_DECRYPT_NEXT_IPSEC_GRE_INPUT; - - trace: + /*trace: */ if (PREDICT_FALSE (b[0]->flags & VLIB_BUFFER_IS_TRACED)) { + ipsec_sa_t *sa0 = pool_elt_at_index (im->sad, pd->sa_index); esp_decrypt_trace_t *tr; - u8 *payload = b[0]->data + pd->current_data; + esp_decrypt_packet_data_t *async_pd = + &(esp_post_data (b[0]))->decrypt_data; tr = vlib_add_trace (vm, node, b[0], sizeof (*tr)); - sa0 = pool_elt_at_index (im->sad, - vnet_buffer (b[0])->ipsec.sad_index); + sa0 = pool_elt_at_index (im->sad, async_pd->sa_index); + tr->crypto_alg = sa0->crypto_alg; tr->integ_alg = sa0->integ_alg; - tr->seq = clib_host_to_net_u32 (((esp_header_t *) payload)->seq); + tr->seq = pd->seq; + tr->sa_seq = sa0->last_seq; + tr->sa_seq_hi = sa0->seq_hi; } - /* next */ - n_left -= 1; - next += 1; - pd += 1; - b += 1; + n_left--; + next++; + b++; } n_left = from_frame->n_vectors; vlib_node_increment_counter (vm, node->node_index, - ESP_DECRYPT_ERROR_RX_PKTS, n_left); + ESP_DECRYPT_ERROR_RX_POST_PKTS, n_left); vlib_buffer_enqueue_to_next (vm, node, from, nexts, n_left); - b = bufs; return n_left; } @@ -439,7 +1395,60 @@ 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, + esp_decrypt_async_next.esp4_post_next); +} + +VLIB_NODE_FN (esp4_decrypt_post_node) (vlib_main_t * vm, + vlib_node_runtime_t * node, + vlib_frame_t * from_frame) +{ + return esp_decrypt_post_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, + esp_decrypt_async_next.esp4_tun_post_next); +} + +VLIB_NODE_FN (esp4_decrypt_tun_post_node) (vlib_main_t * vm, + vlib_node_runtime_t * node, + vlib_frame_t * from_frame) +{ + return esp_decrypt_post_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, + esp_decrypt_async_next.esp6_post_next); +} + +VLIB_NODE_FN (esp6_decrypt_post_node) (vlib_main_t * vm, + vlib_node_runtime_t * node, + vlib_frame_t * from_frame) +{ + return esp_decrypt_post_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, + esp_decrypt_async_next.esp6_tun_post_next); +} + +VLIB_NODE_FN (esp6_decrypt_tun_post_node) (vlib_main_t * vm, + vlib_node_runtime_t * node, + vlib_frame_t * from_frame) +{ + return esp_decrypt_post_inline (vm, node, from_frame, 1, 1); } /* *INDENT-OFF* */ @@ -454,21 +1463,27 @@ VLIB_REGISTER_NODE (esp4_decrypt_node) = { .n_next_nodes = ESP_DECRYPT_N_NEXT, .next_nodes = { -#define _(s,n) [ESP_DECRYPT_NEXT_##s] = n, - foreach_esp_decrypt_next -#undef _ + [ESP_DECRYPT_NEXT_DROP] = "ip4-drop", + [ESP_DECRYPT_NEXT_IP4_INPUT] = "ip4-input-no-checksum", + [ESP_DECRYPT_NEXT_IP6_INPUT] = "ip6-input", + [ESP_DECRYPT_NEXT_MPLS_INPUT] = "mpls-drop", + [ESP_DECRYPT_NEXT_L2_INPUT] = "l2-input", + [ESP_DECRYPT_NEXT_HANDOFF] = "esp4-decrypt-handoff", }, }; -/* *INDENT-ON* */ -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 /* is_ip6 */ ); -} +VLIB_REGISTER_NODE (esp4_decrypt_post_node) = { + .name = "esp4-decrypt-post", + .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", +}; -/* *INDENT-OFF* */ VLIB_REGISTER_NODE (esp6_decrypt_node) = { .name = "esp6-decrypt", .vector_size = sizeof (u32), @@ -480,11 +1495,86 @@ VLIB_REGISTER_NODE (esp6_decrypt_node) = { .n_next_nodes = ESP_DECRYPT_N_NEXT, .next_nodes = { -#define _(s,n) [ESP_DECRYPT_NEXT_##s] = n, - foreach_esp_decrypt_next -#undef _ + [ESP_DECRYPT_NEXT_DROP] = "ip6-drop", + [ESP_DECRYPT_NEXT_IP4_INPUT] = "ip4-input-no-checksum", + [ESP_DECRYPT_NEXT_IP6_INPUT] = "ip6-input", + [ESP_DECRYPT_NEXT_MPLS_INPUT] = "mpls-drop", + [ESP_DECRYPT_NEXT_L2_INPUT] = "l2-input", + [ESP_DECRYPT_NEXT_HANDOFF]= "esp6-decrypt-handoff", + }, +}; + +VLIB_REGISTER_NODE (esp6_decrypt_post_node) = { + .name = "esp6-decrypt-post", + .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", +}; + +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, + .n_next_nodes = ESP_DECRYPT_N_NEXT, + .next_nodes = { + [ESP_DECRYPT_NEXT_DROP] = "ip4-drop", + [ESP_DECRYPT_NEXT_IP4_INPUT] = "ip4-input-no-checksum", + [ESP_DECRYPT_NEXT_IP6_INPUT] = "ip6-input", + [ESP_DECRYPT_NEXT_MPLS_INPUT] = "mpls-input", + [ESP_DECRYPT_NEXT_L2_INPUT] = "l2-input", + [ESP_DECRYPT_NEXT_HANDOFF] = "esp4-decrypt-tun-handoff", + }, +}; + +VLIB_REGISTER_NODE (esp4_decrypt_tun_post_node) = { + .name = "esp4-decrypt-tun-post", + .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-tun", +}; + +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, + .n_next_nodes = ESP_DECRYPT_N_NEXT, + .next_nodes = { + [ESP_DECRYPT_NEXT_DROP] = "ip6-drop", + [ESP_DECRYPT_NEXT_IP4_INPUT] = "ip4-input-no-checksum", + [ESP_DECRYPT_NEXT_IP6_INPUT] = "ip6-input", + [ESP_DECRYPT_NEXT_MPLS_INPUT] = "mpls-input", + [ESP_DECRYPT_NEXT_L2_INPUT] = "l2-input", + [ESP_DECRYPT_NEXT_HANDOFF]= "esp6-decrypt-tun-handoff", }, }; + +VLIB_REGISTER_NODE (esp6_decrypt_tun_post_node) = { + .name = "esp6-decrypt-tun-post", + .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-tun", +}; /* *INDENT-ON* */ /*