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9f0ea7d4f2
Zebra: Add route-map support for Next Hop Tracking It is sometimes useful to restrict the resolution of recursive routes to only specific via's. For example, in some configurations resolving a route through a default route is not acceptable. This patch adds a new route-map attach point, to zebra's next-hop-tracking server. Whenever NHT is considering sending notification of a route resolution, it applies a specified route-map and only if it passes, is the NHT reachable message sent to the appropriate client protocol (BGP, OSPF etc.). If the route-map filters the resolution, then a withdraw is sent to the client protocol. The route-map is sent the ip address of the route via which the resolution is happening as well as the valid NHs associated with that route. We also add support for matching on IP addr prefix len and source protocol to ensure that resolution happens only via a very specific route.
136 lines
3.9 KiB
C
136 lines
3.9 KiB
C
/* Zebra daemon server header.
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* Copyright (C) 1997, 98 Kunihiro Ishiguro
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*
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* This file is part of GNU Zebra.
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*
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* GNU Zebra is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2, or (at your option) any
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* later version.
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*
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* GNU Zebra is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GNU Zebra; see the file COPYING. If not, write to the Free
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* Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
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* 02111-1307, USA.
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*/
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#ifndef _ZEBRA_ZSERV_H
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#define _ZEBRA_ZSERV_H
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#include "rib.h"
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#include "if.h"
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#include "workqueue.h"
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#include "routemap.h"
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/* Default port information. */
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#define ZEBRA_VTY_PORT 2601
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/* Default configuration filename. */
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#define DEFAULT_CONFIG_FILE "zebra.conf"
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#define ZEBRA_RMAP_DEFAULT_UPDATE_TIMER 5 /* disabled by default */
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/* Client structure. */
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struct zserv
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{
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/* Client file descriptor. */
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int sock;
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/* Input/output buffer to the client. */
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struct stream *ibuf;
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struct stream *obuf;
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/* Buffer of data waiting to be written to client. */
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struct buffer *wb;
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/* Threads for read/write. */
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struct thread *t_read;
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struct thread *t_write;
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/* Thread for delayed close. */
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struct thread *t_suicide;
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/* default routing table this client munges */
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int rtm_table;
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/* This client's redistribute flag. */
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u_char redist[ZEBRA_ROUTE_MAX];
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/* Redistribute default route flag. */
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u_char redist_default;
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/* Interface information. */
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u_char ifinfo;
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/* Router-id information. */
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u_char ridinfo;
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/* client's protocol */
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u_char proto;
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};
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/* Zebra instance */
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struct zebra_t
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{
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/* Thread master */
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struct thread_master *master;
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struct list *client_list;
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/* default table */
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int rtm_table_default;
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/* rib work queue */
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struct work_queue *ribq;
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struct meta_queue *mq;
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};
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/* Count prefix size from mask length */
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#define PSIZE(a) (((a) + 7) / (8))
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/* Prototypes. */
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extern void zebra_init (void);
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extern void zebra_if_init (void);
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extern void zebra_zserv_socket_init (char *path);
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extern void hostinfo_get (void);
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extern void rib_init (void);
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extern void interface_list (void);
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extern void kernel_init (void);
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extern void route_read (void);
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extern void zebra_route_map_init (void);
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extern void zebra_snmp_init (void);
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extern void zebra_vty_init (void);
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extern int zsend_interface_add (struct zserv *, struct interface *);
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extern int zsend_interface_delete (struct zserv *, struct interface *);
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extern int zsend_interface_address (int, struct zserv *, struct interface *,
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struct connected *);
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extern void nbr_connected_replacement_add_ipv6 (struct interface *,
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struct in6_addr *, u_char);
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extern void nbr_connected_delete_ipv6 (struct interface *, struct in6_addr *, u_char);
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extern int zsend_interface_update (int, struct zserv *, struct interface *);
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extern int zsend_route_multipath (int, struct zserv *, struct prefix *,
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struct rib *);
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extern int zsend_router_id_update(struct zserv *, struct prefix *);
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extern pid_t pid;
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extern void zserv_create_header(struct stream *s, uint16_t cmd);
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extern int zebra_server_send_message(struct zserv *client);
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extern void zebra_route_map_write_delay_timer(struct vty *);
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extern route_map_result_t zebra_route_map_check (int family, int rib_type,
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struct prefix *p,
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struct nexthop *nexthop);
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extern route_map_result_t zebra_nht_route_map_check (int family,
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int client_proto,
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struct prefix *p,
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struct rib *,
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struct nexthop *nexthop);
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#endif /* _ZEBRA_ZEBRA_H */
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