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authorFlorin Coras <fcoras@cisco.com>2021-05-17 19:09:33 -0700
committerDamjan Marion <dmarion@me.com>2021-05-19 19:34:12 +0000
commit46b8b1a4c0743ef91d41db6dea582eb590f5f31b (patch)
treef1af283c36657fdf9a873cdeeb58fb04a61aeed4 /RELEASE.md
parent6e9964e6c0a5d2a7102f22695f796054fd8f2b95 (diff)
session: cleanup event llist usage
Type: refactor Signed-off-by: Florin Coras <fcoras@cisco.com> Change-Id: I750c856ac81d951e8c0e62c710e0f35a0c80d6f9
Diffstat (limited to 'RELEASE.md')
0 files changed, 0 insertions, 0 deletions
*/ .highlight .k { color: #008800; font-weight: bold } /* Keyword */ .highlight .ch { color: #888888 } /* Comment.Hashbang */ .highlight .cm { color: #888888 } /* Comment.Multiline */ .highlight .cp { color: #cc0000; font-weight: bold } /* Comment.Preproc */ .highlight .cpf { color: #888888 } /* Comment.PreprocFile */ .highlight .c1 { color: #888888 } /* Comment.Single */ .highlight .cs { color: #cc0000; font-weight: bold; background-color: #fff0f0 } /* Comment.Special */ .highlight .gd { color: #000000; background-color: #ffdddd } /* Generic.Deleted */ .highlight .ge { font-style: italic } /* Generic.Emph */ .highlight .gr { color: #aa0000 } /* Generic.Error */ .highlight .gh { color: #333333 } /* Generic.Heading */ .highlight .gi { color: #000000; background-color: #ddffdd } /* Generic.Inserted */ .highlight .go { color: #888888 } /* Generic.Output */ .highlight .gp { color: #555555 } /* Generic.Prompt */ .highlight .gs { font-weight: bold } /* Generic.Strong */ .highlight .gu { color: #666666 } /* Generic.Subheading */ .highlight .gt { color: #aa0000 } /* Generic.Traceback */ .highlight .kc { color: #008800; font-weight: bold } /* Keyword.Constant */ .highlight .kd { color: #008800; font-weight: bold } /* Keyword.Declaration */ .highlight .kn { color: #008800; font-weight: bold } /* Keyword.Namespace */ .highlight .kp { color: #008800 } /* Keyword.Pseudo */ .highlight .kr { color: #008800; font-weight: bold } /* Keyword.Reserved */ .highlight .kt { color: #888888; font-weight: bold } /* Keyword.Type */ .highlight .m { color: #0000DD; font-weight: bold } /* Literal.Number */ .highlight .s { color: #dd2200; background-color: #fff0f0 } /* Literal.String */ .highlight .na { color: #336699 } /* Name.Attribute */ .highlight .nb { color: #003388 } /* Name.Builtin */ .highlight .nc { color: #bb0066; font-weight: bold } /* Name.Class */ .highlight .no { color: #003366; font-weight: bold } /* Name.Constant */ .highlight .nd { color: #555555 } /* Name.Decorator */ .highlight .ne { color: #bb0066; font-weight: bold } /* Name.Exception */ .highlight .nf { color: #0066bb; font-weight: bold } /* Name.Function */ .highlight .nl { color: #336699; font-style: italic } /* Name.Label */ .highlight .nn { color: #bb0066; font-weight: bold } /* Name.Namespace */ .highlight .py { color: #336699; font-weight: bold } /* Name.Property */ .highlight .nt { color: #bb0066; font-weight: bold } /* Name.Tag */ .highlight .nv { color: #336699 } /* Name.Variable */ .highlight .ow { color: #008800 } /* Operator.Word */ .highlight .w { color: #bbbbbb } /* Text.Whitespace */ .highlight .mb { color: #0000DD; font-weight: bold } /* Literal.Number.Bin */ .highlight .mf { color: #0000DD; font-weight: bold } /* Literal.Number.Float */ .highlight .mh { color: #0000DD; font-weight: bold } /* Literal.Number.Hex */ .highlight .mi { color: #0000DD; font-weight: bold } /* Literal.Number.Integer */ .highlight .mo { color: #0000DD; font-weight: bold } /* Literal.Number.Oct */ .highlight .sa { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Affix */ .highlight .sb { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Backtick */ .highlight .sc { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Char */ .highlight .dl { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Delimiter */ .highlight .sd { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Doc */ .highlight .s2 { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Double */ .highlight .se { color: #0044dd; background-color: #fff0f0 } /* Literal.String.Escape */ .highlight .sh { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Heredoc */ .highlight .si { color: #3333bb; background-color: #fff0f0 } /* Literal.String.Interpol */ .highlight .sx { color: #22bb22; background-color: #f0fff0 } /* Literal.String.Other */ .highlight .sr { color: #008800; background-color: #fff0ff } /* Literal.String.Regex */ .highlight .s1 { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Single */ .highlight .ss { color: #aa6600; background-color: #fff0f0 } /* Literal.String.Symbol */ .highlight .bp { color: #003388 } /* Name.Builtin.Pseudo */ .highlight .fm { color: #0066bb; font-weight: bold } /* Name.Function.Magic */ .highlight .vc { color: #336699 } /* Name.Variable.Class */ .highlight .vg { color: #dd7700 } /* Name.Variable.Global */ .highlight .vi { color: #3333bb } /* Name.Variable.Instance */ .highlight .vm { color: #336699 } /* Name.Variable.Magic */ .highlight .il { color: #0000DD; font-weight: bold } /* Literal.Number.Integer.Long */
/*
 * 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.
 */
/*
 * trace.h: VLIB trace buffer.
 *
 * Copyright (c) 2008 Eliot Dresselhaus
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 *  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 *  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 *  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
 *  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
 *  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 *  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

#ifndef included_vlib_trace_h
#define included_vlib_trace_h

#include <vppinfra/pool.h>

typedef struct
{
  /* CPU time stamp trace was made. */
  u64 time;

  /* Node which generated this trace. */
  u32 node_index;

  /* Number of data words in this trace. */
  u32 n_data;

  /* Trace data follows. */
  u8 data[0];
} vlib_trace_header_t;

typedef struct
{
  /* Current number of traces in buffer. */
  u32 count;

  /* Max. number of traces to be added to buffer. */
  u32 limit;
} vlib_trace_node_t;

/* Callback type for post-processing the vlib trace buffer */
struct vlib_main_t;
struct vlib_trace_main_t;
typedef void (vlib_trace_buffer_callback_t) (struct vlib_main_t *,
					     struct vlib_trace_main_t *);

/* Callback type for alternate handling of vlib_add_trace internals */
struct vlib_node_runtime_t;
struct vlib_buffer_t;
typedef void *(vlib_add_trace_callback_t) (struct vlib_main_t *,
					   struct vlib_node_runtime_t * r,
					   struct vlib_buffer_t * b,
					   u32 n_data_bytes);

typedef struct
{
  /* Pool of trace buffers. */
  vlib_trace_header_t **trace_buffer_pool;

  u32 last_main_loop_count;
  u32 filter_node_index;
  u32 filter_flag;
#define FILTER_FLAG_NONE    0
#define FILTER_FLAG_INCLUDE 1
#define FILTER_FLAG_EXCLUDE 2
  u32 filter_count;

  /* set on trace add, cleared on clear trace */
  u32 trace_enable;

  /* Per node trace counts. */
  vlib_trace_node_t *nodes;

  /* verbosity */
  int verbose;

  /* a callback to enable customized consumption of the trace buffer content */
  vlib_trace_buffer_callback_t *trace_buffer_callback;

  /* a callback to enable customized addition of a new trace */
  vlib_add_trace_callback_t *add_trace_callback;

} vlib_trace_main_t;

format_function_t format_vlib_trace;

#endif /* included_vlib_trace_h */

/*
 * fd.io coding-style-patch-verification: ON
 *
 * Local Variables:
 * eval: (c-set-style "gnu")
 * End:
 */
#n535'>535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631
/*
 * Copyright (c) 2016 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.
 */
/*
 * ip/ip6.h: ip6 main include file
 *
 * Copyright (c) 2008 Eliot Dresselhaus
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 *  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 *  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 *  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
 *  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
 *  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 *  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

#ifndef included_ip_ip6_h
#define included_ip_ip6_h

#include <vlib/buffer.h>
#include <vnet/ethernet/packet.h>
#include <vnet/ethernet/mac_address.h>
#include <vnet/ip/ip6_packet.h>
#include <vnet/ip/ip46_address.h>
#include <vnet/ip/ip6_hop_by_hop_packet.h>
#include <vnet/ip/lookup.h>
#include <vnet/ip/ip_interface.h>
#include <stdbool.h>
#include <vppinfra/bihash_24_8.h>
#include <vppinfra/bihash_40_8.h>
#include <vppinfra/bihash_template.h>
#include <vnet/util/radix.h>
#include <vnet/util/throttle.h>

/*
 * Default size of the ip6 fib hash table
 */
#define IP6_FIB_DEFAULT_HASH_NUM_BUCKETS (64 * 1024)
#define IP6_FIB_DEFAULT_HASH_MEMORY_SIZE (32<<20)

typedef struct
{
  ip6_address_t addr;
  u32 dst_address_length;
  u32 vrf_index;
} ip6_fib_key_t;

typedef struct
{
  /* required for pool_get_aligned. */
  CLIB_CACHE_LINE_ALIGN_MARK (cacheline0);

  /* Table ID (hash key) for this FIB. */
  u32 table_id;

  /* Index into FIB vector. */
  u32 index;
} ip6_fib_t;

typedef struct ip6_mfib_t
{
  /* required for pool_get_aligned. */
  CLIB_CACHE_LINE_ALIGN_MARK (cacheline0);

  /* Table ID (hash key) for this FIB. */
  u32 table_id;

  /* Index into FIB vector. */
  u32 index;
} ip6_mfib_t;

struct ip6_main_t;

typedef void (ip6_add_del_interface_address_function_t)
  (struct ip6_main_t * im,
   uword opaque,
   u32 sw_if_index,
   ip6_address_t * address,
   u32 address_length, u32 if_address_index, u32 is_del);

typedef struct
{
  ip6_add_del_interface_address_function_t *function;
  uword function_opaque;
} ip6_add_del_interface_address_callback_t;

typedef void (ip6_table_bind_function_t)
  (struct ip6_main_t * im,
   uword opaque, u32 sw_if_index, u32 new_fib_index, u32 old_fib_index);

typedef struct
{
  ip6_table_bind_function_t *function;
  uword function_opaque;
} ip6_table_bind_callback_t;

/**
 * Enumeration of the FIB table instance types
 */
typedef enum ip6_fib_table_instance_type_t_
{
    /**
     * This table stores the routes that are used to forward traffic.
     * The key is the prefix, the result the adjacency to forward on.
     */
  IP6_FIB_TABLE_FWDING,
    /**
     * The table that stores ALL routes learned by the DP.
     * Some of these routes may not be ready to install in forwarding
     * at a given time.
     * The key in this table is the prefix, the result is the fib_entry_t
     */
  IP6_FIB_TABLE_NON_FWDING,
} ip6_fib_table_instance_type_t;

#define IP6_FIB_NUM_TABLES (IP6_FIB_TABLE_NON_FWDING+1)

/**
 * A representation of a single IP6 table
 */
typedef struct ip6_fib_table_instance_t_
{
  /* The hash table */
  clib_bihash_24_8_t ip6_hash;

  /* bitmap / refcounts / vector of mask widths to search */
  uword *non_empty_dst_address_length_bitmap;
  u8 *prefix_lengths_in_search_order;
  i32 dst_address_length_refcounts[129];
} ip6_fib_table_instance_t;

/**
 * A representation of a single IP6 mfib table
 */
typedef struct ip6_mfib_table_instance_t_
{
  /* The hash table */
  clib_bihash_40_8_t ip6_mhash;

  /* bitmap / refcounts / vector of mask widths to search */
  uword *non_empty_dst_address_length_bitmap;
  u16 *prefix_lengths_in_search_order;
  i32 dst_address_length_refcounts[257];
} ip6_mfib_table_instance_t;

typedef struct ip6_main_t
{
  /**
   * The two FIB tables; fwding and non-fwding
   */
  ip6_fib_table_instance_t ip6_table[IP6_FIB_NUM_TABLES];

  /**
   * the single MFIB table
   */
  ip6_mfib_table_instance_t ip6_mtable;

  ip_lookup_main_t lookup_main;

  /* Pool of FIBs. */
  struct fib_table_t_ *fibs;

  /* Pool of V6 FIBs. */
  ip6_fib_t *v6_fibs;

  /** Vector of MFIBs. */
  struct mfib_table_t_ *mfibs;

  /* Network byte orders subnet mask for each prefix length */
  ip6_address_t fib_masks[129];

  /* Table index indexed by software interface. */
  u32 *fib_index_by_sw_if_index;

  /** Table index indexed by software interface. */
  u32 *mfib_index_by_sw_if_index;

  /* IP6 enabled count by software interface */
  u8 *ip_enabled_by_sw_if_index;

  /* Hash table mapping table id to fib index.
     ID space is not necessarily dense; index space is dense. */
  uword *fib_index_by_table_id;

  /** Hash table mapping table id to multicast fib index.
     ID space is not necessarily dense; index space is dense. */
  uword *mfib_index_by_table_id;

  /* Hash table mapping interface rewrite adjacency index by sw if index. */
  uword *interface_route_adj_index_by_sw_if_index;

  /* Functions to call when interface address changes. */
    ip6_add_del_interface_address_callback_t
    * add_del_interface_address_callbacks;

  /** Functions to call when interface to table biding changes. */
  ip6_table_bind_callback_t *table_bind_callbacks;

  /* ip6 lookup table config parameters */
  u32 lookup_table_nbuckets;
  uword lookup_table_size;

  /* Seed for Jenkins hash used to compute ip6 flow hash. */
  u32 flow_hash_seed;

  struct
  {
    /* TTL to use for host generated packets. */
    u8 ttl;

    u8 pad[3];
  } host_config;

  /* HBH processing enabled? */
  u8 hbh_enabled;

  /** ND throttling */
  throttle_t nd_throttle;
} ip6_main_t;

#define ND_THROTTLE_BITS 512

/* Global ip6 main structure. */
extern ip6_main_t ip6_main;

/* Global ip6 input node.  Errors get attached to ip6 input node. */
extern vlib_node_registration_t ip6_input_node;
extern vlib_node_registration_t ip6_rewrite_node;
extern vlib_node_registration_t ip6_rewrite_mcast_node;
extern vlib_node_registration_t ip6_rewrite_local_node;
extern vlib_node_registration_t ip6_discover_neighbor_node;
extern vlib_node_registration_t ip6_glean_node;
extern vlib_node_registration_t ip6_midchain_node;
extern vlib_node_registration_t ip6_punt_node;

extern void ip6_forward_next_trace (vlib_main_t * vm,
				    vlib_node_runtime_t * node,
				    vlib_frame_t * frame,
				    vlib_rx_or_tx_t which_adj_index);

always_inline uword
ip6_destination_matches_route (const ip6_main_t * im,
			       const ip6_address_t * key,
			       const ip6_address_t * dest, uword dest_length)
{
  int i;
  for (i = 0; i < ARRAY_LEN (key->as_uword); i++)
    {
      if ((key->as_uword[i] ^ dest->as_uword[i]) & im->
	  fib_masks[dest_length].as_uword[i])
	return 0;
    }
  return 1;
}

always_inline uword
ip6_destination_matches_interface (ip6_main_t * im,
				   ip6_address_t * key,
				   ip_interface_address_t * ia)
{
  ip6_address_t *a = ip_interface_address_get_address (&im->lookup_main, ia);
  return ip6_destination_matches_route (im, key, a, ia->address_length);
}

/* As above but allows for unaligned destinations (e.g. works right from IP header of packet). */
always_inline uword
ip6_unaligned_destination_matches_route (ip6_main_t * im,
					 ip6_address_t * key,
					 ip6_address_t * dest,
					 uword dest_length)
{
  int i;
  for (i = 0; i < ARRAY_LEN (key->as_uword); i++)
    {
      if ((clib_mem_unaligned (&key->as_uword[i], uword) ^ dest->as_uword[i])
	  & im->fib_masks[dest_length].as_uword[i])
	return 0;
    }
  return 1;
}

/* Find interface address which matches destination. */
always_inline ip6_address_t *
ip6_interface_address_matching_destination (ip6_main_t * im,
					    const ip6_address_t * dst,
					    u32 sw_if_index,
					    ip_interface_address_t **
					    result_ia)
{
  ip_lookup_main_t *lm = &im->lookup_main;
  ip_interface_address_t *ia;
  ip6_address_t *result = 0;

  /* *INDENT-OFF* */
  foreach_ip_interface_address (lm, ia, sw_if_index,
                                1 /* honor unnumbered */,
  ({
    ip6_address_t * a = ip_interface_address_get_address (lm, ia);
    if (ip6_destination_matches_route (im, dst, a, ia->address_length))
      {
	result = a;
	break;
      }
  }));
  /* *INDENT-ON* */
  if (result_ia)
    *result_ia = result ? ia : 0;
  return result;
}

clib_error_t *ip6_add_del_interface_address (vlib_main_t * vm,
					     u32 sw_if_index,
					     ip6_address_t * address,
					     u32 address_length, u32 is_del);
void ip6_sw_interface_enable_disable (u32 sw_if_index, u32 is_enable);

/**
 * @brief get first IPv6 interface address
 */
ip6_address_t *ip6_interface_first_address (ip6_main_t * im, u32 sw_if_index);

int ip6_address_compare (ip6_address_t * a1, ip6_address_t * a2);

uword
ip6_udp_register_listener (vlib_main_t * vm,
			   u16 dst_port, u32 next_node_index);

u16 ip6_tcp_udp_icmp_compute_checksum (vlib_main_t * vm, vlib_buffer_t * p0,
				       ip6_header_t * ip0,
				       int *bogus_lengthp);

void ip6_register_protocol (u32 protocol, u32 node_index);
void ip6_unregister_protocol (u32 protocol);
void ip6_local_hop_by_hop_register_protocol (u32 protocol, u32 node_index);

serialize_function_t serialize_vnet_ip6_main, unserialize_vnet_ip6_main;

int vnet_set_ip6_flow_hash (u32 table_id,
			    flow_hash_config_t flow_hash_config);

u8 *format_ip6_forward_next_trace (u8 * s, va_list * args);

u32 ip6_tcp_udp_icmp_validate_checksum (vlib_main_t * vm, vlib_buffer_t * p0);

void ip6_punt_policer_add_del (u8 is_add, u32 policer_index);
void ip6_punt_redirect_add (u32 rx_sw_if_index,
			    u32 tx_sw_if_index, ip46_address_t * nh);
void ip6_punt_redirect_add_paths (u32 rx_sw_if_index,
				  fib_route_path_t * paths);
void ip6_punt_redirect_del (u32 rx_sw_if_index);

int vnet_set_ip6_classify_intfc (vlib_main_t * vm, u32 sw_if_index,
				 u32 table_index);
extern vlib_node_registration_t ip6_lookup_node;

/* Compute flow hash.  We'll use it to select which Sponge to use for this
   flow.  And other things. */
always_inline u32
ip6_compute_flow_hash (const ip6_header_t * ip,
		       flow_hash_config_t flow_hash_config)
{
  tcp_header_t *tcp;
  u64 a, b, c;
  u64 t1, t2;
  uword is_tcp_udp = 0;
  u8 protocol = ip->protocol;

  if (PREDICT_TRUE
      ((ip->protocol == IP_PROTOCOL_TCP)
       || (ip->protocol == IP_PROTOCOL_UDP)))
    {
      is_tcp_udp = 1;
      tcp = (void *) (ip + 1);
    }
  else if (ip->protocol == IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS)
    {
      ip6_hop_by_hop_header_t *hbh = (ip6_hop_by_hop_header_t *) (ip + 1);
      if ((hbh->protocol == IP_PROTOCOL_TCP) ||
	  (hbh->protocol == IP_PROTOCOL_UDP))
	{
	  is_tcp_udp = 1;
	  tcp = (tcp_header_t *) ((u8 *) hbh + ((hbh->length + 1) << 3));
	}
      protocol = hbh->protocol;
    }

  t1 = (ip->src_address.as_u64[0] ^ ip->src_address.as_u64[1]);
  t1 = (flow_hash_config & IP_FLOW_HASH_SRC_ADDR) ? t1 : 0;

  t2 = (ip->dst_address.as_u64[0] ^ ip->dst_address.as_u64[1]);
  t2 = (flow_hash_config & IP_FLOW_HASH_DST_ADDR) ? t2 : 0;

  a = (flow_hash_config & IP_FLOW_HASH_REVERSE_SRC_DST) ? t2 : t1;
  b = (flow_hash_config & IP_FLOW_HASH_REVERSE_SRC_DST) ? t1 : t2;

  t1 = is_tcp_udp ? tcp->src : 0;
  t2 = is_tcp_udp ? tcp->dst : 0;

  t1 = (flow_hash_config & IP_FLOW_HASH_SRC_PORT) ? t1 : 0;
  t2 = (flow_hash_config & IP_FLOW_HASH_DST_PORT) ? t2 : 0;

  if (flow_hash_config & IP_FLOW_HASH_SYMMETRIC)
    {
      if (b < a)
	{
	  c = a;
	  a = b;
	  b = c;
	}
      if (t2 < t1)
	{
	  t2 += t1;
	  t1 = t2 - t1;
	  t2 = t2 - t1;
	}
    }

  b ^= (flow_hash_config & IP_FLOW_HASH_PROTO) ? protocol : 0;
  c = (flow_hash_config & IP_FLOW_HASH_REVERSE_SRC_DST) ?
    ((t1 << 16) | t2) : ((t2 << 16) | t1);

  hash_mix64 (a, b, c);
  return (u32) c;
}

/* ip6_locate_header
 *
 * This function is to search for the header specified by the protocol number
 * in find_hdr_type.
 * This is used to locate a specific IPv6 extension header
 * or to find transport layer header.
 *   1. If the find_hdr_type < 0 then it finds and returns the protocol number and
 *   offset stored in *offset of the transport or ESP header in the chain if
 *   found.
 *   2. If a header with find_hdr_type > 0 protocol number is found then the
 *      offset is stored in *offset and protocol number of the header is
 *      returned.
 *   3. If find_hdr_type is not found or packet is malformed or
 *      it is a non-first fragment -1 is returned.
 */
always_inline int
ip6_locate_header (vlib_buffer_t * p0,
		   ip6_header_t * ip0, int find_hdr_type, u32 * offset)
{
  u8 next_proto = ip0->protocol;
  u8 *next_header;
  u8 done = 0;
  u32 cur_offset;
  u8 *temp_nxthdr = 0;
  u32 exthdr_len = 0;

  next_header = ip6_next_header (ip0);
  cur_offset = sizeof (ip6_header_t);
  while (1)
    {
      done = (next_proto == find_hdr_type);
      if (PREDICT_FALSE
	  (next_header >=
	   (u8 *) vlib_buffer_get_current (p0) + p0->current_length))
	{
	  //A malicious packet could set an extension header with a too big size
	  return (-1);
	}
      if (done)
	break;
      if ((!ip6_ext_hdr (next_proto)) || next_proto == IP_PROTOCOL_IP6_NONXT)
	{
	  if (find_hdr_type < 0)
	    break;
	  return -1;
	}
      if (next_proto == IP_PROTOCOL_IPV6_FRAGMENTATION)
	{
	  ip6_frag_hdr_t *frag_hdr = (ip6_frag_hdr_t *) next_header;
	  u16 frag_off = ip6_frag_hdr_offset (frag_hdr);
	  /* Non first fragment return -1 */
	  if (frag_off)
	    return (-1);
	  exthdr_len = sizeof (ip6_frag_hdr_t);
	  temp_nxthdr = next_header + exthdr_len;
	}
      else if (next_proto == IP_PROTOCOL_IPSEC_AH)
	{
	  exthdr_len =
	    ip6_ext_authhdr_len (((ip6_ext_header_t *) next_header));
	  temp_nxthdr = next_header + exthdr_len;
	}
      else
	{
	  exthdr_len =
	    ip6_ext_header_len (((ip6_ext_header_t *) next_header));
	  temp_nxthdr = next_header + exthdr_len;
	}
      next_proto = ((ip6_ext_header_t *) next_header)->next_hdr;
      next_header = temp_nxthdr;
      cur_offset += exthdr_len;
    }

  *offset = cur_offset;
  return (next_proto);
}

u8 *format_ip6_hop_by_hop_ext_hdr (u8 * s, va_list * args);
/*
 * Hop-by-Hop handling
 */
typedef struct
{
  /* Array of function pointers to HBH option handling routines */
  int (*options[256]) (vlib_buffer_t * b, ip6_header_t * ip,
		       ip6_hop_by_hop_option_t * opt);
  u8 *(*trace[256]) (u8 * s, ip6_hop_by_hop_option_t * opt);
  uword next_override;
} ip6_hop_by_hop_main_t;

extern ip6_hop_by_hop_main_t ip6_hop_by_hop_main;

int ip6_hbh_register_option (u8 option,
			     int options (vlib_buffer_t * b,
					  ip6_header_t * ip,
					  ip6_hop_by_hop_option_t * opt),
			     u8 * trace (u8 * s,
					 ip6_hop_by_hop_option_t * opt));
int ip6_hbh_unregister_option (u8 option);
void ip6_hbh_set_next_override (uword next);

/**
 * Push IPv6 header to buffer
 *
 * @param vm - vlib_main
 * @param b - buffer to write the header to
 * @param src - source IP
 * @param dst - destination IP
 * @param prot - payload proto
 * @param flow_label - flow label
 *
 * @return - pointer to start of IP header
 */
always_inline void *
vlib_buffer_push_ip6_custom (vlib_main_t * vm, vlib_buffer_t * b,
			     ip6_address_t * src, ip6_address_t * dst,
			     int proto, u32 flow_label)
{
  ip6_header_t *ip6h;
  u16 payload_length;

  /* make some room */
  ip6h = vlib_buffer_push_uninit (b, sizeof (ip6_header_t));
  ASSERT (flow_label < 1 << 20);
  ip6h->ip_version_traffic_class_and_flow_label =
    clib_host_to_net_u32 ((0x6 << 28) | flow_label);

  /* calculate ip6 payload length */
  payload_length = vlib_buffer_length_in_chain (vm, b);
  payload_length -= sizeof (*ip6h);

  ip6h->payload_length = clib_host_to_net_u16 (payload_length);

  ip6h->hop_limit = 0xff;
  ip6h->protocol = proto;
  clib_memcpy_fast (ip6h->src_address.as_u8, src->as_u8,
		    sizeof (ip6h->src_address));
  clib_memcpy_fast (ip6h->dst_address.as_u8, dst->as_u8,
		    sizeof (ip6h->src_address));
  vnet_buffer (b)->l3_hdr_offset = (u8 *) ip6h - b->data;
  b->flags |= VNET_BUFFER_F_IS_IP6 | VNET_BUFFER_F_L3_HDR_OFFSET_VALID;

  return ip6h;
}

/**
 * Push IPv6 header to buffer
 *
 * @param vm - vlib_main
 * @param b - buffer to write the header to
 * @param src - source IP
 * @param dst - destination IP
 * @param prot - payload proto
 *
 * @return - pointer to start of IP header
 */
always_inline void *
vlib_buffer_push_ip6 (vlib_main_t * vm, vlib_buffer_t * b,
		      ip6_address_t * src, ip6_address_t * dst, int proto)
{
  return vlib_buffer_push_ip6_custom (vm, b, src, dst, proto,
				      0 /* flow label */ );

}

always_inline u32
vlib_buffer_get_ip6_fib_index (vlib_buffer_t * b)
{
  u32 fib_index, sw_if_index;
  sw_if_index = vnet_buffer (b)->sw_if_index[VLIB_RX];
  fib_index = vnet_buffer (b)->sw_if_index[VLIB_TX];
  return (fib_index == (u32) ~ 0) ?
    vec_elt (ip6_main.fib_index_by_sw_if_index, sw_if_index) : fib_index;
}
#endif /* included_ip_ip6_h */

/*
 * fd.io coding-style-patch-verification: ON
 *
 * Local Variables:
 * eval: (c-set-style "gnu")
 * End:
 */