#include <vnet/ipsec/ipsec_io.h>
#include <vnet/ipsec/ipsec_tun.h>
-#include <vnet/gre/gre.h>
+#include <vnet/gre/packet.h>
-#define foreach_esp_decrypt_next \
-_(DROP, "error-drop") \
-_(IP4_INPUT, "ip4-input-no-checksum") \
-_(IP6_INPUT, "ip6-input") \
-_(L2_INPUT, "l2-input") \
-_(HANDOFF, "handoff")
+#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
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)") \
return s;
}
-typedef struct
-{
- vlib_buffer_t *lb;
- union
- {
- struct
- {
- u8 icv_sz;
- u8 iv_sz;
- ipsec_sa_flags_t flags;
- u32 sa_index;
- };
- u64 sa_data;
- };
-
- u32 seq;
- u32 free_buffer_index;
- i16 current_data;
- i16 current_length;
- u16 hdr_sz;
- u8 icv_removed;
- u8 __unused;
-} esp_decrypt_packet_data_t;
-
-STATIC_ASSERT_SIZEOF (esp_decrypt_packet_data_t, 4 * sizeof (u64));
-
#define ESP_ENCRYPT_PD_F_FD_TRANSPORT (1 << 2)
static_always_inline void
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, u16 * dif)
+ 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 = pd->lb->current_length;
+ u16 last_sz = pd2->lb->current_length;
u16 first_sz = icv_sz - last_sz;
bp = before_last = first;
bp = vlib_get_buffer (vm, bp->next_buffer);
}
- u8 *lb_curr = vlib_buffer_get_current (pd->lb);
+ 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;
- pd->lb = before_last;
- pd->icv_removed = 1;
- pd->free_buffer_index = before_last->next_buffer;
+ 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 int
+static_always_inline i16
esp_insert_esn (vlib_main_t * vm, ipsec_sa_t * sa,
- esp_decrypt_packet_data_t * pd, vnet_crypto_op_t * op,
- u16 * len, vlib_buffer_t * b, u8 * payload)
+ 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 1;
+ 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 (pd->icv_removed)
+ if (pd2->icv_removed)
{
- u16 space_left = vlib_buffer_space_left_at_end (vm, pd->lb);
+ u16 space_left = vlib_buffer_space_left_at_end (vm, pd2->lb);
if (space_left >= sz)
{
- clib_memcpy_fast (vlib_buffer_get_tail (pd->lb), &seq_hi, sz);
- op->len += sz;
+ clib_memcpy_fast (vlib_buffer_get_tail (pd2->lb), &seq_hi, sz);
+ *data_len += sz;
}
else
- return 0;
+ return sz;
len[0] = b->current_length;
}
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);
- op->len += sz;
- op->digest += sz;
+ *data_len += sz;
+ *digest += sz;
}
- return 1;
+ return sz;
}
static_always_inline u8 *
esp_move_icv_esn (vlib_main_t * vm, vlib_buffer_t * first,
- esp_decrypt_packet_data_t * pd, u16 icv_sz, ipsec_sa_t * sa,
- u8 * extra_esn, vnet_crypto_op_t * op)
+ 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, icv_sz, &dif);
+ u8 *digest = esp_move_icv (vm, first, pd, pd2, icv_sz, &dif);
if (dif)
- op->len -= 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, pd->lb);
+ u16 space_left = vlib_buffer_space_left_at_end (vm, pd2->lb);
if (space_left >= sz)
{
- clib_memcpy_fast (vlib_buffer_get_tail (pd->lb), &seq_hi, sz);
- op->len += 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 (pd->icv_removed);
- vlib_buffer_t *tmp = vlib_get_buffer (vm, pd->free_buffer_index);
+ 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_tun)
+ int is_ip6, int is_tun, u16 async_next)
{
ipsec_main_t *im = &ipsec_main;
u32 thread_index = vm->thread_index;
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_chunk_t *ch;
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);
- vec_reset_length (ptd->chained_crypto_ops);
- vec_reset_length (ptd->chained_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);
if (n_bufs == 0)
{
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;
}
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;
+
+ /* 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;
+ }
}
if (PREDICT_FALSE (~0 == sa0->decrypt_thread_index))
ipsec_sa_assign_thread (thread_index));
}
- if (PREDICT_TRUE (thread_index != sa0->decrypt_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;
}
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->is_chain = 0;
+ pd2->lb = b[0];
+ pd2->free_buffer_index = 0;
+ pd2->icv_removed = 0;
- pd->lb = b[0];
if (n_bufs > 1)
{
+ pd->is_chain = 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);
+ 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, 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;
}
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;
+ esp_set_next_index (is_async, from, nexts, from[b - bufs],
+ &n_async_drop, ESP_DECRYPT_NEXT_DROP, next);
goto next;
}
current_sa_pkts += 1;
current_sa_bytes += vlib_buffer_length_in_chain (vm, b[0]);
- if (PREDICT_TRUE (sa0->integ_op_id != VNET_CRYPTO_OP_NONE))
+ if (is_async)
{
- 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 (pd->lb != b[0])
+ 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))
{
- /* buffer is chained */
- vlib_buffer_t *cb = b[0];
- 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 (pd->lb->current_length < cpd.icv_sz)
- {
- u8 extra_esn = 0;
- op->digest =
- esp_move_icv_esn (vm, b[0], pd, cpd.icv_sz, sa0,
- &extra_esn, op);
-
- if (extra_esn)
- {
- /* esn is in the last buffer, that was unlinked from
- * the chain */
- op->len = b[0]->current_length;
- }
- else
- {
- if (pd->lb == b[0])
- {
- /* 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[0]->current_length;
- goto out;
- }
- }
- }
- else
- op->digest = vlib_buffer_get_tail (pd->lb) - cpd.icv_sz;
-
- op->flags |= VNET_CRYPTO_OP_FLAG_CHAINED_BUFFERS;
- op->chunk_index = vec_len (ptd->chunks);
- 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;
- }
- }
- break;
- }
- else
- ch->len = cb->current_length;
-
- if (!(cb->flags & VLIB_BUFFER_NEXT_PRESENT))
- break;
-
- cb = vlib_get_buffer (vm, cb->next_buffer);
- }
- }
- else
- esp_insert_esn (vm, sa0, pd, op, &len, b[0], 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.
+ 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.
*/
- 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;
+ 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;
}
- 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)
- {
- u16 dif = 0;
- op->tag =
- esp_move_icv (vm, b[0], pd, cpd.icv_sz, &dif);
-
- /* 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);
- if (pd->lb == b[0])
- ch[-1].len -= dif;
- else
- 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);
- }
- }
-
- vec_add_aligned (crypto_ops[0], op, 1, CLIB_CACHE_LINE_BYTES);
}
-
+ 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;
}
current_sa_index, current_sa_pkts,
current_sa_bytes);
- 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);
+ if (is_async)
+ {
+ if (async_frame && async_frame->n_elts)
+ {
+ 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);
+ }
+
+ /* 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);
- 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);
+ 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
node */
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;
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);
+ if (next[0] >= ESP_DECRYPT_N_NEXT)
+ esp_decrypt_post_crypto (vm, node, pd, pd2, b[0], next, is_ip6,
+ is_tun, 0);
- /*
- * 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))
+ /* trace: */
+ if (PREDICT_FALSE (b[0]->flags & VLIB_BUFFER_IS_TRACED))
{
- b[0]->error = node->errors[ESP_DECRYPT_ERROR_REPLAY];
- next[0] = ESP_DECRYPT_NEXT_DROP;
- goto trace;
+ 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;
}
- ipsec_sa_anti_replay_advance (sa0, pd->seq);
-
- u8 pad_length = 0, next_header = 0;
- u16 icv_sz = pd->icv_removed ? 0 : pd->icv_sz;
+ /* next */
+ n_left -= 1;
+ next += 1;
+ pd += 1;
+ pd2 += 1;
+ b += 1;
+ }
- if (pd->free_buffer_index)
- vlib_buffer_free_one (vm, pd->free_buffer_index);
+ n_left = from_frame->n_vectors;
+ vlib_node_increment_counter (vm, node->node_index,
+ ESP_DECRYPT_ERROR_RX_PKTS, n_left);
- 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_enqueue_to_next (vm, node, from, nexts, n_left);
- 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);
+ return n_left;
+}
- 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;
- }
+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);
- 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[0]->flags &= ~VLIB_BUFFER_TOTAL_LENGTH_VALID;
+ while (n_left > 0)
+ {
+ esp_decrypt_packet_data_t *pd = &(esp_post_data (b[0]))->decrypt_data;
- if ((pd->flags & tun_flags) == 0 && !is_tun) /* transport mode */
+ if (n_left > 2)
{
- 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 += 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_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;
- }
+ 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 (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;
- esp_remove_tail (vm, b[0], pd->lb, tail);
- }
- 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;
- esp_remove_tail (vm, b[0], pd->lb, tail);
- }
- else
- {
- if (is_tun && next_header == IP_PROTOCOL_GRE)
- {
- gre_header_t *gre;
-
- b[0]->current_data = pd->current_data + adv;
- b[0]->current_length = pd->current_length - adv - tail;
-
- gre = vlib_buffer_get_current (b[0]);
-
- vlib_buffer_advance (b[0], sizeof (*gre));
-
- switch (clib_net_to_host_u16 (gre->protocol))
- {
- case GRE_PROTOCOL_teb:
- vnet_update_l2_len (b[0]);
- 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[0]->error =
- node->errors[ESP_DECRYPT_ERROR_UNSUP_PAYLOAD];
- next[0] = ESP_DECRYPT_NEXT_DROP;
- break;
- }
- }
- else
- {
- next[0] = ESP_DECRYPT_NEXT_DROP;
- b[0]->error = node->errors[ESP_DECRYPT_ERROR_UNSUP_PAYLOAD];
- goto trace;
- }
- }
- 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;
-
- itp = ipsec_tun_protect_get
- (vnet_buffer (b[0])->ipsec.protect_index);
-
- if (PREDICT_TRUE (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 (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];
- }
- }
- }
- }
+ 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);
}
- 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;
+ 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 = pd->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);
vlib_node_runtime_t * node,
vlib_frame_t * from_frame)
{
- return esp_decrypt_inline (vm, node, from_frame, 0, 0);
+ 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);
+ 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);
+ 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);
+ 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* */
[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",
},
};
+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",
+};
+
VLIB_REGISTER_NODE (esp6_decrypt_node) = {
.name = "esp6-decrypt",
.vector_size = sizeof (u32),
[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),
[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),
[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* */
/*
Code Review / vpp.git / blobdiff