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8a92a8a00c
mirror_frr/lib/zclient.h
Donald Sharp 8a92a8a00c bgpd, zebra: rfc-5549-generic.patch 
This adds support for BGP RFC 5549 (Extended Next Hop Encoding capability)

     * send and receive of the capability
     * processing of IPv4->IPv6 next-hops
     * for resolving these IPv6 next-hops, itsworks with the current
       next-hop-tracking support
     * added a new message type between BGP and Zebra for such route
       install/uninstall
     * zserv side of changes to process IPv4 prefix ->IPv6 next-hops
     * required show command changes for IPv4 prefix having IPv6 next-hops

Few points to note about the implementation:

     * It does an implicit next-hop-self when a [IPv4 prefix -> IPv6 LL next-hop]
       is to be considered for advertisement to IPv4 peering (or IPv6 peering
       without Extended next-hop capability negotiated)

     * Currently feature is off by default, enable it by configuring
       'neighbor <> capability extended-nexthop'

     * Current support is for IPv4 Unicast prefixes only.

IMPORTANT NOTE:

     This patch alone isn't enough to have IPv4->IPv6 routes installed into
     the kernel. A separate patch is needed for that to work for the netlink
     interface.

Signed-off-by: Vipin Kumar <vipin@cumulusnetworks.com>
Reviewed-by: Daniel Walton <dwalton@cumulusnetworks.com>
             Vivek Venkatraman <vivek@cumulusnetworks.com>
             Donald Sharp <sharpd@cumulusnetworks.com>
2015-06-11 09:19:12 -07:00

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/* Zebra's client header.
* Copyright (C) 1999 Kunihiro Ishiguro
*
* This file is part of GNU Zebra.
*
* GNU Zebra is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* GNU Zebra is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GNU Zebra; see the file COPYING. If not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#ifndef _ZEBRA_ZCLIENT_H
#define _ZEBRA_ZCLIENT_H
/* For struct zapi_ipv{4,6}. */
#include "prefix.h"
/* For struct interface and struct connected. */
#include "if.h"
/* For input/output buffer to zebra. */
#define ZEBRA_MAX_PACKET_SIZ 4096
/* Zebra header size. */
#define ZEBRA_HEADER_SIZE 6
struct redist_proto
{
u_char enabled;
struct list *instances;
};
/* Structure for the zebra client. */
struct zclient
{
/* Socket to zebra daemon. */
int sock;
/* Flag of communication to zebra is enabled or not. Default is on.
This flag is disabled by `no router zebra' statement. */
int enable;
/* Connection failure count. */
int fail;
/* Input buffer for zebra message. */
struct stream *ibuf;
/* Output buffer for zebra message. */
struct stream *obuf;
/* Buffer of data waiting to be written to zebra. */
struct buffer *wb;
/* Read and connect thread. */
struct thread *t_read;
struct thread *t_connect;
/* Thread to write buffered data to zebra. */
struct thread *t_write;
/* Redistribute information. */
u_char redist_default; /* clients protocol */
u_short instance;
struct redist_proto redist[AFI_MAX][ZEBRA_ROUTE_MAX];
/* Redistribute defauilt. */
u_char default_information;
/* Pointer to the callback functions. */
int (*router_id_update) (int, struct zclient *, uint16_t);
int (*interface_add) (int, struct zclient *, uint16_t);
int (*interface_delete) (int, struct zclient *, uint16_t);
int (*interface_up) (int, struct zclient *, uint16_t);
int (*interface_down) (int, struct zclient *, uint16_t);
int (*interface_address_add) (int, struct zclient *, uint16_t);
int (*interface_address_delete) (int, struct zclient *, uint16_t);
int (*interface_bfd_dest_down) (int, struct zclient *, uint16_t);
int (*interface_nbr_address_add) (int, struct zclient *, uint16_t);
int (*interface_nbr_address_delete) (int, struct zclient *, uint16_t);
int (*ipv4_route_add) (int, struct zclient *, uint16_t);
int (*ipv4_route_delete) (int, struct zclient *, uint16_t);
int (*ipv6_route_add) (int, struct zclient *, uint16_t);
int (*ipv6_route_delete) (int, struct zclient *, uint16_t);
int (*nexthop_update) (int, struct zclient *, uint16_t);
int (*import_check_update) (int, struct zclient *, uint16_t);
};
/* Zebra API message flag. */
#define ZAPI_MESSAGE_NEXTHOP 0x01
#define ZAPI_MESSAGE_IFINDEX 0x02
#define ZAPI_MESSAGE_DISTANCE 0x04
#define ZAPI_MESSAGE_METRIC 0x08
#define ZAPI_MESSAGE_TAG 0x10
#define ZAPI_MESSAGE_ONLINK 0x20
/* Zserv protocol message header */
struct zserv_header
{
uint16_t length;
uint8_t marker; /* corresponds to command field in old zserv
* always set to 255 in new zserv.
*/
uint8_t version;
#define ZSERV_VERSION 2
uint16_t command;
};
/* Zebra IPv4 route message API. */
struct zapi_ipv4
{
u_char type;
u_short instance;
u_char flags;
u_char message;
safi_t safi;
u_char nexthop_num;
struct in_addr **nexthop;
u_char ifindex_num;
unsigned int *ifindex;
u_char distance;
u_int32_t metric;
u_short tag;
};
/* Prototypes of zebra client service functions. */
extern struct zclient *zclient_new (void);
extern void zclient_init (struct zclient *, int, u_short);
extern int zclient_start (struct zclient *);
extern void zclient_stop (struct zclient *);
extern void zclient_reset (struct zclient *);
extern void zclient_free (struct zclient *);
extern int zclient_socket_connect (struct zclient *);
extern void zclient_serv_path_set (char *path);
extern int redist_check_instance (struct redist_proto *, u_short);
extern void redist_add_instance (struct redist_proto *, u_short);
extern void redist_del_instance (struct redist_proto *, u_short);
/* Send redistribute command to zebra daemon. Do not update zclient state. */
extern int zebra_redistribute_send (int command, struct zclient *, afi_t, int type, u_short instance);
/* If state has changed, update state and call zebra_redistribute_send. */
extern void zclient_redistribute (int command, struct zclient *, afi_t, int type,
u_short instance);
/* If state has changed, update state and send the command to zebra. */
extern void zclient_redistribute_default (int command, struct zclient *);
/* Send the message in zclient->obuf to the zebra daemon (or enqueue it).
Returns 0 for success or -1 on an I/O error. */
extern int zclient_send_message(struct zclient *);
/* create header for command, length to be filled in by user later */
extern void zclient_create_header (struct stream *, uint16_t);
extern struct interface *zebra_interface_add_read (struct stream *);
extern struct interface *zebra_interface_state_read (struct stream *s);
extern struct connected *zebra_interface_address_read (int, struct stream *);
extern struct interface *zebra_interface_bfd_read (struct stream *s, struct prefix *);
extern struct nbr_connected *zebra_interface_nbr_address_read (int, struct stream *);
extern void zebra_interface_if_set_value (struct stream *, struct interface *);
extern void zebra_router_id_update_read (struct stream *s, struct prefix *rid);
extern int zapi_ipv4_route (u_char, struct zclient *, struct prefix_ipv4 *,
struct zapi_ipv4 *);
#ifdef HAVE_IPV6
/* IPv6 prefix add and delete function prototype. */
struct zapi_ipv6
{
u_char type;
u_short instance;
u_char flags;
u_char message;
safi_t safi;
u_char nexthop_num;
struct in6_addr **nexthop;
u_char ifindex_num;
unsigned int *ifindex;
u_char distance;
u_int32_t metric;
u_short tag;
};
extern int zapi_ipv6_route (u_char cmd, struct zclient *zclient,
struct prefix_ipv6 *p, struct zapi_ipv6 *api);
extern int zapi_ipv4_route_ipv6_nexthop (u_char, struct zclient *,
struct prefix_ipv4 *, struct zapi_ipv6 *);
#endif /* HAVE_IPV6 */
#endif /* _ZEBRA_ZCLIENT_H */
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