IABSD.fr/src/usr.sbin/bgpctl/mrtparser.h

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• Author : claudio
  Date : 2021-07-27 07:42:37
  Hash : 9e59dee7
  Message : Implemnt the RFC8050 in the MRT parser. With this MRT dumps containing add-path information will be dumped properly. There is one bit where this implementation is not in line with the RFC. The encoding of DUMP_V2_RIB_GENERIC_ADDPATH for non IPv4 or IPv6 prefixes is implemented the way gobgp did it (which seems to be the only other BGP implementation that supports generic encoding). The RFC puts the path_id in the NLRI for generic encoding instead of adding it to RIB entry struct like in the IPv4 and IPv6 encoding. This is an open discussion point with the RFC author. OK benno@

• usr.sbin/bgpctl/mrtparser.h

• /*	$OpenBSD: mrtparser.h,v 1.4 2021/07/27 07:42:37 claudio Exp $ */
  /*
   * Copyright (c) 2011 Claudio Jeker <claudio@openbsd.org>
   *
   * Permission to use, copy, modify, and distribute this software for any
   * purpose with or without fee is hereby granted, provided that the above
   * copyright notice and this permission notice appear in all copies.
   *
   * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
   * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
   * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
   * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
   * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
   * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
   */
  
  #include "bgpd.h"
  
  /* data structures for the MSG_TABLE_DUMP_V2 format */
  struct mrt_peer_entry {
  	struct bgpd_addr	addr;
  	u_int32_t		bgp_id;
  	u_int32_t		asnum;
  };
  
  struct mrt_peer {
  	char			*view;
  	struct mrt_peer_entry	*peers;
  	u_int32_t		 bgp_id;
  	u_int16_t		 npeers;
  };
  
  struct mrt_attr {
  	void	*attr;
  	size_t	 attr_len;
  };
  
  struct mrt_rib_entry {
  	void		*aspath;
  	struct mrt_attr	*attrs;
  	struct bgpd_addr nexthop;
  	time_t		 originated;
  	u_int32_t	 local_pref;
  	u_int32_t	 med;
  	u_int32_t	 path_id;
  	u_int16_t	 peer_idx;
  	u_int16_t	 aspath_len;
  	u_int16_t	 nattrs;
  	u_int8_t	 origin;
  };
  
  struct mrt_rib {
  	struct mrt_rib_entry	*entries;
  	struct bgpd_addr	 prefix;
  	u_int32_t		 seqnum;
  	u_int16_t		 nentries;
  	u_int8_t		 prefixlen;
  	u_int8_t	 	 add_path;
  };
  
  /* data structures for the BGP4MP MESSAGE and STATE types */
  struct mrt_bgp_state {
  	struct timespec		time;
  	struct bgpd_addr	src;
  	struct bgpd_addr	dst;
  	u_int32_t		src_as;
  	u_int32_t		dst_as;
  	u_int16_t		old_state;
  	u_int16_t		new_state;
  };
  
  struct mrt_bgp_msg {
  	struct timespec	 time;
  	struct bgpd_addr src;
  	struct bgpd_addr dst;
  	u_int32_t	 src_as;
  	u_int32_t	 dst_as;
  	u_int16_t	 msg_len;
  	u_int8_t	 add_path;
  	void		*msg;
  };
  
  #define MRT_ATTR_ORIGIN		1
  #define MRT_ATTR_ASPATH		2
  #define MRT_ATTR_NEXTHOP	3
  #define MRT_ATTR_MED		4
  #define MRT_ATTR_LOCALPREF	5
  #define MRT_ATTR_MP_REACH_NLRI	14
  #define MRT_ATTR_AS4PATH	17
  #define MRT_ATTR_EXTLEN		0x10
  
  #define MRT_PREFIX_LEN(x)	((((u_int)x) + 7) / 8)
  
  struct mrt_parser {
  	void	(*dump)(struct mrt_rib *, struct mrt_peer *, void *);
  	void	(*state)(struct mrt_bgp_state *, void *);
  	void	(*message)(struct mrt_bgp_msg *, void *);
  	void	*arg;
  };
  
  void	mrt_parse(int, struct mrt_parser *, int);