/*
 * esp_encrypt.c : IPSec ESP encrypt node
 *
 * Copyright (c) 2015 Cisco and/or its affiliates.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at:
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include <vnet/vnet.h>
#include <vnet/api_errno.h>
#include <vnet/ip/ip.h>
#include <vnet/udp/udp.h>

#include <vnet/crypto/crypto.h>

#include <vnet/ipsec/ipsec.h>
#include <vnet/ipsec/esp.h>

#define foreach_esp_encrypt_next                   \
_(DROP, "error-drop")                              \
_(IP4_LOOKUP, "ip4-lookup")                        \
_(IP6_LOOKUP, "ip6-lookup")                        \
_(INTERFACE_OUTPUT, "interface-output")

#define _(v, s) ESP_ENCRYPT_NEXT_##v,
typedef enum
{
  foreach_esp_encrypt_next
#undef _
    ESP_ENCRYPT_N_NEXT,
} esp_encrypt_next_t;

#define foreach_esp_encrypt_error                               \
 _(RX_PKTS, "ESP pkts received")                                \
 _(SEQ_CYCLED, "sequence number cycled (packet dropped)")       \
 _(CRYPTO_ENGINE_ERROR, "crypto engine error (packet dropped)") \
 _(CHAINED_BUFFER, "chained buffers (packet dropped)")          \
 _(NO_TRAILER_SPACE, "no trailer space (packet dropped)")

typedef enum
{
#define _(sym,str) ESP_ENCRYPT_ERROR_##sym,
  foreach_esp_encrypt_error
#undef _
    ESP_ENCRYPT_N_ERROR,
} esp_encrypt_error_t;

static char *esp_encrypt_error_strings[] = {
#define _(sym,string) string,
  foreach_esp_encrypt_error
#undef _
};

typedef struct
{
  u32 sa_index;
  u32 spi;
  u32 seq;
  u8 udp_encap;
  ipsec_crypto_alg_t crypto_alg;
  ipsec_integ_alg_t integ_alg;
} esp_encrypt_trace_t;

/* packet trace format function */
static u8 *
format_esp_encrypt_trace (u8 * s, va_list * args)
{
  CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
  CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
  esp_encrypt_trace_t *t = va_arg (*args, esp_encrypt_trace_t *);

  s = format (s, "esp: sa-index %d spi %u seq %u crypto %U integrity %U%s",
	      t->sa_index, t->spi, t->seq,
	      format_ipsec_crypto_alg, t->crypto_alg,
	      format_ipsec_integ_alg, t->integ_alg,
	      t->udp_encap ? " udp-encap-enabled" : "");
  return s;
}

/* pad packet in input buffer */
static_always_inline u8 *
esp_add_footer_and_icv (vlib_buffer_t * b, u8 block_size, u8 icv_sz)
{
  static const u8 pad_data[ESP_MAX_BLOCK_SIZE] = {
    0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08,
    0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x00, 0x00,
  };

  u16 min_length = b->current_length + sizeof (esp_footer_t);
  u16 new_length = round_pow2 (min_length, block_size);
  u8 pad_bytes = new_length - min_length;
  esp_footer_t *f = (esp_footer_t *) (vlib_buffer_get_current (b) +
				      new_length - sizeof (esp_footer_t));

  if (pad_bytes)
    clib_memcpy_fast ((u8 *) f - pad_bytes, pad_data, ESP_MAX_BLOCK_SIZE);

  f->pad_length = pad_bytes;
  b->current_length = new_length + icv_sz;
  return &f->next_header;
}

static_always_inline void
esp_update_ip4_hdr (ip4_header_t * ip4, u16 len, int is_transport, int is_udp)
{
  ip_csum_t sum;
  u16 old_len;

  len = clib_net_to_host_u16 (len);
  old_len = ip4->length;

  if (is_transport)
    {
      u8 prot = is_udp ? IP_PROTOCOL_UDP : IP_PROTOCOL_IPSEC_ESP;

      sum = ip_csum_update (ip4->checksum, ip4->protocol,
			    prot, ip4_header_t, protocol);
      ip4->protocol = prot;

      sum = ip_csum_update (sum, old_len, len, ip4_header_t, length);
    }
  else
    sum = ip_csum_update (ip4->checksum, old_len, len, ip4_header_t, length);

  ip4->length = len;
  ip4->checksum = ip_csum_fold (sum);
}

static_always_inline void
esp_fill_udp_hdr (ipsec_sa_t * sa, udp_header_t * udp, u16 len)
{
  clib_memcpy_fast (udp, &sa->udp_hdr, sizeof (udp_header_t));
  udp->length = clib_net_to_host_u16 (len);
}

static_always_inline u8
ext_hdr_is_pre_esp (u8 nexthdr)
{
#ifdef CLIB_HAVE_VEC128
  static const u8x16 ext_hdr_types = {
    IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS,
    IP_PROTOCOL_IPV6_ROUTE,
    IP_PROTOCOL_IPV6_FRAGMENTATION,
  };

  return !u8x16_is_all_zero (ext_hdr_types == u8x16_splat (nexthdr));
#else
  return ((nexthdr ^ IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS) |
	  (nexthdr ^ IP_PROTOCOL_IPV6_ROUTE) |
	  (nexthdr ^ IP_PROTOCOL_IPV6_FRAGMENTATION) != 0);
#endif
}

static_always_inline u8
esp_get_ip6_hdr_len (ip6_header_t * ip6)
{
  /* this code assumes that HbH, route and frag headers will be before
     others, if that is not the case, they will end up encrypted */

  u8 len = sizeof (ip6_header_t);
  ip6_ext_header_t *p;

  /* if next packet doesn't have ext header */
  if (ext_hdr_is_pre_esp (ip6->protocol) == 0)
    return len;

  p = (void *) (ip6 + 1);
  len += ip6_ext_header_len (p);

  while (ext_hdr_is_pre_esp (p->next_hdr))
    {
      len += ip6_ext_header_len (p);
      p = ip6_ext_next_header (p);
    }

  return len;
}

static_always_inline int
esp_trailer_icv_overflow (vlib_node_runtime_t * node, vlib_buffer_t * b,
			  u16 * next, u16 buffer_data_size)
{
  if (b->current_data + b->current_length <= buffer_data_size)
    return 0;

  b->current_length -= buffer_data_size - b->current_data;
  b->error = node->errors[ESP_ENCRYPT_ERROR_NO_TRAILER_SPACE];
  next[0] = ESP_ENCRYPT_NEXT_DROP;
  return 1;
}

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)
{
  u32 n_fail, n_ops = vec_len (ops);
  vnet_crypto_op_t *op = ops;

  if (n_ops == 0)
    return;

  n_fail = n_ops - vnet_crypto_process_ops (vm, op, n_ops);

  while (n_fail)
    {
      ASSERT (op - ops < n_ops);

      if (op->status != VNET_CRYPTO_OP_STATUS_COMPLETED)
	{
	  u32 bi = op->user_data;
	  b[bi]->error = node->errors[ESP_ENCRYPT_ERROR_CRYPTO_ENGINE_ERROR];
	  nexts[bi] = ESP_ENCRYPT_NEXT_DROP;
	  n_fail--;
	}
      op++;
    }
}

typedef struct
{
  u32 salt;
  u64 iv;
} __clib_packed esp_gcm_nonce_t;

STATIC_ASSERT_SIZEOF (esp_gcm_nonce_t, 12);

always_inline uword
esp_encrypt_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
		    vlib_frame_t * frame, int is_ip6, int is_tun)
{
  ipsec_main_t *im = &ipsec_main;
  ipsec_per_thread_data_t *ptd = vec_elt_at_index (im->ptd, vm->thread_index);
  u32 *from = vlib_frame_vector_args (frame);
  u32 n_left = frame->n_vectors;
  vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b = bufs;
  u16 nexts[VLIB_FRAME_SIZE], *next = nexts;
  esp_gcm_nonce_t nonces[VLIB_FRAME_SIZE], *nonce = nonces;
  u32 thread_index = vm->thread_index;
  u16 buffer_data_size = vlib_buffer_get_default_data_size (vm);
  u32 current_sa_index = ~0, current_sa_packets = 0;
  u32 current_sa_bytes = 0, spi = 0;
  u8 block_sz = 0, iv_sz = 0, icv_sz = 0;
  ipsec_sa_t *sa0 = 0;

  vlib_get_buffers (vm, from, b, n_left);
  vec_reset_length (ptd->crypto_ops);
  vec_reset_length (ptd->integ_ops);

  while (n_left > 0)
    {
      u32 sa_index0;
      dpo_id_t *dpo;
      esp_header_t *esp;
      u8 *payload, *next_hdr_ptr;
      u16 payload_len;
      u32 hdr_len;

      if (n_left > 2)
	{
	  u8 *p;
	  vlib_prefetch_buffer_header (b[2], LOAD);
	  p = vlib_buffer_get_current (b[1]);
	  CLIB_PREFETCH (p, CLIB_CACHE_LINE_BYTES, LOAD);
	  p -= CLIB_CACHE_LINE_BYTES;
	  CLIB_PREFETCH (p, CLIB_CACHE_LINE_BYTES, LOAD);
	}

      if (is_tun)
	{
	  /* we are on a ipsec tunnel's feature arc */
	  u32 next0;
	  sa_index0 = *(u32 *) vnet_feature_next_with_data (&next0, b[0],
							    sizeof
							    (sa_index0));
	  next[0] = next0;
	}
      else
	sa_index0 = vnet_buffer (b[0])->ipsec.sad_index;

      if (sa_index0 != current_sa_index)
	{
	  sa0 = pool_elt_at_index (im->sad, sa_index0);
	  current_sa_index = sa_index0;
	  vlib_increment_combined_counter (&ipsec_sa_counters, thread_index,
					   sa_index0, current_sa_packets,
					   current_sa_bytes);
	  current_sa_packets = current_sa_bytes = 0;
	  spi = clib_net_to_host_u32 (sa0->spi);
	  block_sz = sa0->crypto_block_size;
	  icv_sz = sa0->integ_icv_size;
	  iv_sz = sa0->crypto_iv_size;
	}

      if (vlib_buffer_chain_linearize (vm, b[0]) != 1)
	{
	  b[0]->error = node->errors[ESP_ENCRYPT_ERROR_CHAINED_BUFFER];
	  next[0] = ESP_ENCRYPT_NEXT_DROP;
	  goto trace;
	}

      if (PREDICT_FALSE (esp_seq_advance (sa0)))
	{
	  b[0]->error = node->errors[ESP_ENCRYPT_ERROR_SEQ_CYCLED];
	  next[0] = ESP_ENCRYPT_NEXT_DROP;
	  goto trace;
	}

      /* space for IV */
      hdr_len = iv_sz;

      if (ipsec_sa_is_set_IS_TUNNEL (sa0))
	{
	  payload = vlib_buffer_get_current (b[0]);
	  next_hdr_ptr = esp_add_footer_and_icv (b[0], block_sz, icv_sz);
	  payload_len = b[0]->current_length;

	  if (esp_trailer_icv_overflow (node, b[0], next, buffer_data_size))
	    goto trace;

	  /* ESP header */
	  hdr_len += sizeof (*esp);
	  esp = (esp_header_t *) (payload - hdr_len);

	  /* optional UDP header */
	  if (ipsec_sa_is_set_UDP_ENCAP (sa0))
	    {
	      hdr_len += sizeof (udp_header_t);
	      esp_fill_udp_hdr (sa0, (udp_header_t *) (payload - hdr_len),
				payload_len + hdr_len);
	    }

	  /* IP header */
	  if (ipsec_sa_is_set_IS_TUNNEL_V6 (sa0))
	    {
	      ip6_header_t *ip6;
	      u16 len = sizeof (ip6_header_t);
	      hdr_len += len;
	      ip6 = (ip6_header_t *) (payload - hdr_len);
	      clib_memcpy_fast (ip6, &sa0->ip6_hdr, len);
	      *next_hdr_ptr = (is_ip6 ?
			       IP_PROTOCOL_IPV6 : IP_PROTOCOL_IP_IN_IP);
	      len = payload_len + hdr_len - len;
	      ip6->payload_length = clib_net_to_host_u16 (len);
	    }
	  else
	    {
	      ip4_header_t *ip4;
	      u16 len = sizeof (ip4_header_t);
	      hdr_len += len;
	      ip4 = (ip4_header_t *) (payload - hdr_len);
	      clib_memcpy_fast (ip4, &sa0->ip4_hdr, len);
	      *next_hdr_ptr = (is_ip6 ?
			       IP_PROTOCOL_IPV6 : IP_PROTOCOL_IP_IN_IP);
	      len = payload_len + hdr_len;
	      esp_update_ip4_hdr (ip4, len, /* is_transport */ 0, 0);
	    }

	  dpo = sa0->dpo + IPSEC_PROTOCOL_ESP;
	  if (!is_tun)
	    {
	      next[0] = dpo->dpoi_next_node;
	      vnet_buffer (b[0])->ip.adj_index[VLIB_TX] = dpo->dpoi_index;
	    }
	}
      else			/* transport mode */
	{
	  u8 *l2_hdr, l2_len, *ip_hdr, ip_len;
	  udp_header_t *udp = 0;
	  u8 *old_ip_hdr = vlib_buffer_get_current (b[0]);

	  ip_len = is_ip6 ?
	    esp_get_ip6_hdr_len ((ip6_header_t *) old_ip_hdr) :
	    ip4_header_bytes ((ip4_header_t *) old_ip_hdr);

	  vlib_buffer_advance (b[0], ip_len);
	  payload = vlib_buffer_get_current (b[0]);
	  next_hdr_ptr = esp_add_footer_and_icv (b[0], block_sz, icv_sz);
	  payload_len = b[0]->current_length;

	  if (esp_trailer_icv_overflow (node, b[0], next, buffer_data_size))
	    goto trace;

	  /* ESP header */
	  hdr_len += sizeof (*esp);
	  esp = (esp_header_t *) (payload - hdr_len);

	  /* optional UDP header */
	  if (ipsec_sa_is_set_UDP_ENCAP (sa0))
	    {
	      hdr_len += sizeof (udp_header_t);
	      udp = (udp_header_t *) (payload - hdr_len);
	    }

	  /* IP header */
	  hdr_len += ip_len;
	  ip_hdr = payload - hdr_len;

	  /* L2 header */
	  l2_len = vnet_buffer (b[0])->ip.save_rewrite_length;
	  hdr_len += l2_len;
	  l2_hdr = payload - hdr_len;

	  /* copy l2 and ip header */
	  clib_memcpy_le32 (l2_hdr, old_ip_hdr - l2_len, l2_len);
	  clib_memcpy_le64 (ip_hdr, old_ip_hdr, ip_len);

	  if (is_ip6)
	    {
	      ip6_header_t *ip6 = (ip6_header_t *) (ip_hdr);
	      *next_hdr_ptr = ip6->protocol;
	      ip6->protocol = IP_PROTOCOL_IPSEC_ESP;
	      ip6->payload_length =
		clib_host_to_net_u16 (payload_len + hdr_len - l2_len -
				      ip_len);
	    }
	  else
	    {
	      u16 len;
	      ip4_header_t *ip4 = (ip4_header_t *) (ip_hdr);
	      *next_hdr_ptr = ip4->protocol;
	      len = payload_len + hdr_len - l2_len;
	      if (udp)
		{
		  esp_update_ip4_hdr (ip4, len, /* is_transport */ 1, 1);
		  esp_fill_udp_hdr (sa0, udp, len - ip_len);
		}
	      else
		esp_update_ip4_hdr (ip4, len, /* is_transport */ 1, 0);
	    }

	  next[0] = ESP_ENCRYPT_NEXT_INTERFACE_OUTPUT;
	}

      esp->spi = spi;
      esp->seq = clib_net_to_host_u32 (sa0->seq);

      if (sa0->crypto_enc_op_id)
	{
	  vnet_crypto_op_t *op;
	  vec_add2_aligned (ptd->crypto_ops, op, 1, CLIB_CACHE_LINE_BYTES);
	  vnet_crypto_op_init (op, sa0->crypto_enc_op_id);
	  op->src = op->dst = payload;
	  op->key_index = sa0->crypto_key_index;
	  op->len = payload_len - icv_sz;
	  op->user_data = b - bufs;

	  if (ipsec_sa_is_set_IS_AEAD (sa0))
	    {
	      /*
	       * construct the AAD in a scratch space in front
	       * of the IP header.
	       */
	      op->aad = payload - hdr_len - sizeof (esp_aead_t);

	      esp_aad_fill (op, esp, sa0);

	      op->tag = payload + op->len;
	      op->tag_len = 16;

	      u64 *iv = (u64 *) (payload - iv_sz);
	      nonce->salt = sa0->salt;
	      nonce->iv = *iv = clib_host_to_net_u64 (sa0->gcm_iv_counter++);
	      op->iv = (u8 *) nonce;
	      nonce++;
	    }
	  else
	    {
	      op->iv = payload - iv_sz;
	      op->flags = VNET_CRYPTO_OP_FLAG_INIT_IV;
	    }
	}

      if (sa0->integ_op_id)
	{
	  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->src = payload - iv_sz - sizeof (esp_header_t);
	  op->digest = payload + payload_len - icv_sz;
	  op->key_index = sa0->integ_key_index;
	  op->digest_len = icv_sz;
	  op->len = payload_len - icv_sz + iv_sz + sizeof (esp_header_t);
	  op->user_data = b - bufs;
	  if (ipsec_sa_is_set_USE_ESN (sa0))
	    {
	      u32 seq_hi = clib_net_to_host_u32 (sa0->seq_hi);
	      clib_memcpy_fast (op->digest, &seq_hi, sizeof (seq_hi));
	      op->len += sizeof (seq_hi);
	    }
	}

      vlib_buffer_advance (b[0], 0LL - hdr_len);

      current_sa_packets += 1;
      current_sa_bytes += payload_len;

    trace:
      if (PREDICT_FALSE (b[0]->flags & VLIB_BUFFER_IS_TRACED))
	{
	  esp_encrypt_trace_t *tr = vlib_add_trace (vm, node, b[0],
						    sizeof (*tr));
	  tr->sa_index = sa_index0;
	  tr->spi = sa0->spi;
	  tr->seq = sa0->seq - 1;
	  tr->udp_encap = ipsec_sa_is_set_UDP_ENCAP (sa0);
	  tr->crypto_alg = sa0->crypto_alg;
	  tr->integ_alg = sa0->integ_alg;
	}
      /* next */
      n_left -= 1;
      next += 1;
      b += 1;
    }

  vlib_increment_combined_counter (&ipsec_sa_counters, thread_index,
				   current_sa_index, current_sa_packets,
				   current_sa_bytes);
  esp_process_ops (vm, node, ptd->crypto_ops, bufs, nexts);
  esp_process_ops (vm, node, ptd->integ_ops, bufs, nexts);

  vlib_node_increment_counter (vm, node->node_index,
			       ESP_ENCRYPT_ERROR_RX_PKTS, frame->n_vectors);

  vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors);
  return frame->n_vectors;
}

VLIB_NODE_FN (esp4_encrypt_node) (vlib_main_t * vm,
				  vlib_node_runtime_t * node,
				  vlib_frame_t * from_frame)
{
  return esp_encrypt_inline (vm, node, from_frame, 0 /* is_ip6 */ , 0);
}

/* *INDENT-OFF* */
VLIB_REGISTER_NODE (esp4_encrypt_node) = {
  .name = "esp4-encrypt",
  .vector_size = sizeof (u32),
  .format_trace = format_esp_encrypt_trace,
  .type = VLIB_NODE_TYPE_INTERNAL,

  .n_errors = ARRAY_LEN(esp_encrypt_error_strings),
  .error_strings = esp_encrypt_error_strings,

  .n_next_nodes = ESP_ENCRYPT_N_NEXT,
  .next_nodes = {
#define _(s,n) [ESP_ENCRYPT_NEXT_##s] = n,
    foreach_esp_encrypt_next
#undef _
  },
};
/* *INDENT-ON* */

VLIB_NODE_FN (esp6_encrypt_node) (vlib_main_t * vm,
				  vlib_node_runtime_t * node,
				  vlib_frame_t * from_frame)
{
  return esp_encrypt_inline (vm, node, from_frame, 1 /* is_ip6 */ , 0);
}

/* *INDENT-OFF* */
VLIB_REGISTER_NODE (esp6_encrypt_node) = {
  .name = "esp6-encrypt",
  .vector_size = sizeof (u32),
  .format_trace = format_esp_encrypt_trace,
  .type = VLIB_NODE_TYPE_INTERNAL,

  .n_errors = ARRAY_LEN(esp_encrypt_error_strings),
  .error_strings = esp_encrypt_error_strings,

  .n_next_nodes = ESP_ENCRYPT_N_NEXT,
  .next_nodes = {
#define _(s,n) [ESP_ENCRYPT_NEXT_##s] = n,
    foreach_esp_encrypt_next
#undef _
  },
};
/* *INDENT-ON* */

VLIB_NODE_FN (esp4_encrypt_tun_node) (vlib_main_t * vm,
				      vlib_node_runtime_t * node,
				      vlib_frame_t * from_frame)
{
  return esp_encrypt_inline (vm, node, from_frame, 0 /* is_ip6 */ , 1);
}

/* *INDENT-OFF* */
VLIB_REGISTER_NODE (esp4_encrypt_tun_node) = {
  .name = "esp4-encrypt-tun",
  .vector_size = sizeof (u32),
  .format_trace = format_esp_encrypt_trace,
  .type = VLIB_NODE_TYPE_INTERNAL,

  .n_errors = ARRAY_LEN(esp_encrypt_error_strings),
  .error_strings = esp_encrypt_error_strings,

  .n_next_nodes = 1,
  .next_nodes = {
    [ESP_ENCRYPT_NEXT_DROP] = "ip4-drop",
  },
};

VNET_FEATURE_INIT (esp4_encrypt_tun_feat_node, static) =
{
  .arc_name = "ip4-output",
  .node_name = "esp4-encrypt-tun",
  .runs_before = VNET_FEATURES ("adj-midchain-tx"),
};
/* *INDENT-ON* */

VLIB_NODE_FN (esp6_encrypt_tun_node) (vlib_main_t * vm,
				      vlib_node_runtime_t * node,
				      vlib_frame_t * from_frame)
{
  return esp_encrypt_inline (vm, node, from_frame, 1 /* is_ip6 */ , 1);
}

/* *INDENT-OFF* */
VLIB_REGISTER_NODE (esp6_encrypt_tun_node) = {
  .name = "esp6-encrypt-tun",
  .vector_size = sizeof (u32),
  .format_trace = format_esp_encrypt_trace,
  .type = VLIB_NODE_TYPE_INTERNAL,

  .n_errors = ARRAY_LEN(esp_encrypt_error_strings),
  .error_strings = esp_encrypt_error_strings,

  .n_next_nodes = 1,
  .next_nodes = {
    [ESP_ENCRYPT_NEXT_DROP] = "ip6-drop",
  },
};

VNET_FEATURE_INIT (esp6_encrypt_tun_feat_node, static) =
{
  .arc_name = "ip6-output",
  .node_name = "esp6-encrypt-tun",
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};
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