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/*
* Nexthop structure definition.
* Copyright (C) 1997, 98, 99, 2001 Kunihiro Ishiguro
* Copyright (C) 2013 Cumulus Networks, Inc.
*
* This file is part of Quagga.
*
* Quagga 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.
*
* Quagga 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 this program; see the file COPYING; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef _LIB_NEXTHOP_H
#define _LIB_NEXTHOP_H
#include "prefix.h"
#include "mpls.h"
/* Maximum next hop string length - gateway + ifindex */
#define NEXTHOP_STRLEN (INET6_ADDRSTRLEN + 30)
union g_addr {
struct in_addr ipv4;
struct in6_addr ipv6;
};
enum nexthop_types_t
{
NEXTHOP_TYPE_IFINDEX = 1, /* Directly connected. */
NEXTHOP_TYPE_IPV4, /* IPv4 nexthop. */
NEXTHOP_TYPE_IPV4_IFINDEX, /* IPv4 nexthop with ifindex. */
NEXTHOP_TYPE_IPV6, /* IPv6 nexthop. */
NEXTHOP_TYPE_IPV6_IFINDEX, /* IPv6 nexthop with ifindex. */
NEXTHOP_TYPE_BLACKHOLE, /* Null0 nexthop. */
};
/* Nexthop label structure. */
struct nexthop_label
{
u_int8_t num_labels;
u_int8_t reserved[3];
mpls_label_t label[0]; /* 1 or more labels. */
};
/* Nexthop structure. */
struct nexthop
{
struct nexthop *next;
struct nexthop *prev;
/* Interface index. */
ifindex_t ifindex;
enum nexthop_types_t type;
u_char flags;
#define NEXTHOP_FLAG_ACTIVE (1 << 0) /* This nexthop is alive. */
#define NEXTHOP_FLAG_FIB (1 << 1) /* FIB nexthop. */
#define NEXTHOP_FLAG_RECURSIVE (1 << 2) /* Recursive nexthop. */
#define NEXTHOP_FLAG_ONLINK (1 << 3) /* Nexthop should be installed onlink. */
#define NEXTHOP_FLAG_MATCHED (1 << 4) /* Already matched vs a nexthop */
#define NEXTHOP_FLAG_FILTERED (1 << 5) /* rmap filtered, used by static only */
/* Nexthop address */
union g_addr gate;
union g_addr src;
union g_addr rmap_src; /* Src is set via routemap */
/* Nexthops obtained by recursive resolution.
*
* If the nexthop struct needs to be resolved recursively,
* NEXTHOP_FLAG_RECURSIVE will be set in flags and the nexthops
* obtained by recursive resolution will be added to `resolved'.
*/
struct nexthop *resolved;
/* Recursive parent */
struct nexthop *rparent;
/* Type of label(s), if any */
enum lsp_types_t nh_label_type;
/* Label(s) associated with this nexthop. */
struct nexthop_label *nh_label;
};
extern int zebra_rnh_ip_default_route;
extern int zebra_rnh_ipv6_default_route;
static inline int
nh_resolve_via_default(int family)
{
if (((family == AF_INET) && zebra_rnh_ip_default_route) ||
((family == AF_INET6) && zebra_rnh_ipv6_default_route))
return 1;
else
return 0;
}
struct nexthop *nexthop_new (void);
void nexthop_add (struct nexthop **target, struct nexthop *nexthop);
void copy_nexthops (struct nexthop **tnh, struct nexthop *nh, struct nexthop *rparent);
void nexthop_free (struct nexthop *nexthop);
void nexthops_free (struct nexthop *nexthop);
void nexthop_add_labels (struct nexthop *, enum lsp_types_t, u_int8_t, mpls_label_t *);
void nexthop_del_labels (struct nexthop *);
extern const char *nexthop_type_to_str (enum nexthop_types_t nh_type);
extern int nexthop_same_no_recurse (struct nexthop *next1, struct nexthop *next2);
extern int nexthop_labels_match (struct nexthop *nh1, struct nexthop *nh2);
extern const char * nexthop2str (struct nexthop *nexthop, char *str, int size);
#endif /*_LIB_NEXTHOP_H */
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