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mirror_frr/ripd/ripd.h
Lu Feng 6a7cff75c6 ripd: use only one constant for derivation 
RIP_MAX_RTE is defined in ripd.h as 25 but is in fact the
result of a formula. More over it is not used in the code:
the code itself includes the fomula. This makes it un-clear
for maintenance.

Signed-off-by: Feng Lu <lu.feng@6wind.com>
Reviewed-by: Alain Ritoux <alain.ritoux@6wind.com>
Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
(cherry picked from commit 342a31bfda)
2016-05-26 01:06:37 +00:00

442 lines
12 KiB
C
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/* RIP related values and structures.
* Copyright (C) 1997, 1998, 1999 Kunihiro Ishiguro <kunihiro@zebra.org>
*
* 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_RIP_H
#define _ZEBRA_RIP_H
/* RIP version number. */
#define RIPv1 1
#define RIPv2 2
/* N.B. stuff will break if
(RIPv1 != RI_RIP_VERSION_1) || (RIPv2 != RI_RIP_VERSION_2) */
/* RIP command list. */
#define RIP_REQUEST 1
#define RIP_RESPONSE 2
#define RIP_TRACEON 3 /* Obsolete */
#define RIP_TRACEOFF 4 /* Obsolete */
#define RIP_POLL 5
#define RIP_POLL_ENTRY 6
#define RIP_COMMAND_MAX 7
/* RIP metric infinity value.*/
#define RIP_METRIC_INFINITY 16
/* Normal RIP packet min and max size. */
#define RIP_PACKET_MINSIZ 4
#define RIP_PACKET_MAXSIZ 512
#define RIP_HEADER_SIZE 4
#define RIP_RTE_SIZE 20
/* Max count of routing table entry in one rip packet. */
#define RIP_MAX_RTE ((RIP_PACKET_MAXSIZ - RIP_HEADER_SIZE) / RIP_RTE_SIZE)
/* RIP version 2 multicast address. */
#ifndef INADDR_RIP_GROUP
#define INADDR_RIP_GROUP 0xe0000009 /* 224.0.0.9 */
#endif
/* RIP timers */
#define RIP_UPDATE_TIMER_DEFAULT 30
#define RIP_TIMEOUT_TIMER_DEFAULT 180
#define RIP_GARBAGE_TIMER_DEFAULT 120
/* RIP peer timeout value. */
#define RIP_PEER_TIMER_DEFAULT 180
/* RIP port number. */
#define RIP_PORT_DEFAULT 520
#define RIP_VTY_PORT 2602
/* Default configuration file name. */
#define RIPD_DEFAULT_CONFIG "ripd.conf"
/* RIP route types. */
#define RIP_ROUTE_RTE 0
#define RIP_ROUTE_STATIC 1
#define RIP_ROUTE_DEFAULT 2
#define RIP_ROUTE_REDISTRIBUTE 3
#define RIP_ROUTE_INTERFACE 4
/* RIPv2 special RTE family types */
#define RIP_FAMILY_AUTH 0xffff
/* RIPv2 authentication types, for RIP_FAMILY_AUTH RTE's */
#define RIP_NO_AUTH 0
#define RIP_AUTH_DATA 1
#define RIP_AUTH_SIMPLE_PASSWORD 2
#define RIP_AUTH_MD5 3
/* RIPv2 Simple authentication */
#define RIP_AUTH_SIMPLE_SIZE 16
/* RIPv2 MD5 authentication. */
#define RIP_AUTH_MD5_SIZE 16
#define RIP_AUTH_MD5_COMPAT_SIZE RIP_RTE_SIZE
/* RIP structure. */
struct rip
{
/* RIP socket. */
int sock;
/* Default version of rip instance. */
int version_send; /* version 1 or 2 (but not both) */
int version_recv; /* version 1 or 2 or both */
/* Output buffer of RIP. */
struct stream *obuf;
/* RIP routing information base. */
struct route_table *table;
/* RIP only static routing information. */
struct route_table *route;
/* RIP neighbor. */
struct route_table *neighbor;
/* RIP threads. */
struct thread *t_read;
/* Update and garbage timer. */
struct thread *t_update;
/* Triggered update hack. */
int trigger;
struct thread *t_triggered_update;
struct thread *t_triggered_interval;
/* RIP timer values. */
unsigned long update_time;
unsigned long timeout_time;
unsigned long garbage_time;
/* RIP default metric. */
int default_metric;
/* RIP default-information originate. */
u_char default_information;
char *default_information_route_map;
/* RIP default distance. */
u_char distance;
struct route_table *distance_table;
/* For redistribute route map. */
struct
{
char *name;
struct route_map *map;
int metric_config;
u_int32_t metric;
} route_map[ZEBRA_ROUTE_MAX];
};
/* RIP routing table entry which belong to rip_packet. */
struct rte
{
u_int16_t family; /* Address family of this route. */
u_int16_t tag; /* Route Tag which included in RIP2 packet. */
struct in_addr prefix; /* Prefix of rip route. */
struct in_addr mask; /* Netmask of rip route. */
struct in_addr nexthop; /* Next hop of rip route. */
u_int32_t metric; /* Metric value of rip route. */
};
/* RIP packet structure. */
struct rip_packet
{
unsigned char command; /* Command type of RIP packet. */
unsigned char version; /* RIP version which coming from peer. */
unsigned char pad1; /* Padding of RIP packet header. */
unsigned char pad2; /* Same as above. */
struct rte rte[1]; /* Address structure. */
};
/* Buffer to read RIP packet. */
union rip_buf
{
struct rip_packet rip_packet;
char buf[RIP_PACKET_MAXSIZ];
};
/* RIP route information. */
struct rip_info
{
/* This route's type. */
int type;
/* Sub type. */
int sub_type;
/* RIP nexthop. */
struct in_addr nexthop;
struct in_addr from;
/* Which interface does this route come from. */
unsigned int ifindex;
/* Metric of this route. */
u_int32_t metric;
/* External metric of this route.
if learnt from an externalm proto */
u_int32_t external_metric;
/* Tag information of this route. */
u_int16_t tag;
/* Flags of RIP route. */
#define RIP_RTF_FIB 1
#define RIP_RTF_CHANGED 2
u_char flags;
/* Garbage collect timer. */
struct thread *t_timeout;
struct thread *t_garbage_collect;
/* Route-map futures - this variables can be changed. */
struct in_addr nexthop_out;
u_char metric_set;
u_int32_t metric_out;
u_short tag_out;
unsigned int ifindex_out;
struct route_node *rp;
u_char distance;
#ifdef NEW_RIP_TABLE
struct rip_info *next;
struct rip_info *prev;
#endif /* NEW_RIP_TABLE */
};
typedef enum {
RIP_NO_SPLIT_HORIZON = 0,
RIP_SPLIT_HORIZON,
RIP_SPLIT_HORIZON_POISONED_REVERSE
} split_horizon_policy_t;
/* RIP specific interface configuration. */
struct rip_interface
{
/* RIP is enabled on this interface. */
int enable_network;
int enable_interface;
/* RIP is running on this interface. */
int running;
/* RIP version control. */
int ri_send;
int ri_receive;
/* RIPv2 authentication type. */
int auth_type;
/* RIPv2 authentication string. */
char *auth_str;
/* RIPv2 authentication key chain. */
char *key_chain;
/* value to use for md5->auth_len */
u_int8_t md5_auth_len;
/* Split horizon flag. */
split_horizon_policy_t split_horizon;
split_horizon_policy_t split_horizon_default;
/* For filter type slot. */
#define RIP_FILTER_IN 0
#define RIP_FILTER_OUT 1
#define RIP_FILTER_MAX 2
/* Access-list. */
struct access_list *list[RIP_FILTER_MAX];
/* Prefix-list. */
struct prefix_list *prefix[RIP_FILTER_MAX];
/* Route-map. */
struct route_map *routemap[RIP_FILTER_MAX];
/* Wake up thread. */
struct thread *t_wakeup;
/* Interface statistics. */
int recv_badpackets;
int recv_badroutes;
int sent_updates;
/* Passive interface. */
int passive;
};
/* RIP peer information. */
struct rip_peer
{
/* Peer address. */
struct in_addr addr;
/* Peer RIP tag value. */
int domain;
/* Last update time. */
time_t uptime;
/* Peer RIP version. */
u_char version;
/* Statistics. */
int recv_badpackets;
int recv_badroutes;
/* Timeout thread. */
struct thread *t_timeout;
};
struct rip_md5_info
{
u_int16_t family;
u_int16_t type;
u_int16_t packet_len;
u_char keyid;
u_char auth_len;
u_int32_t sequence;
u_int32_t reserv1;
u_int32_t reserv2;
};
struct rip_md5_data
{
u_int16_t family;
u_int16_t type;
u_char digest[16];
};
/* RIP accepet/announce methods. */
#define RI_RIP_UNSPEC 0
#define RI_RIP_VERSION_1 1
#define RI_RIP_VERSION_2 2
#define RI_RIP_VERSION_1_AND_2 3
/* N.B. stuff will break if
(RIPv1 != RI_RIP_VERSION_1) || (RIPv2 != RI_RIP_VERSION_2) */
/* Default value for "default-metric" command. */
#define RIP_DEFAULT_METRIC_DEFAULT 1
/* RIP event. */
enum rip_event
{
RIP_READ,
RIP_UPDATE_EVENT,
RIP_TRIGGERED_UPDATE,
};
/* Macro for timer turn on. */
#define RIP_TIMER_ON(T,F,V) \
do { \
if (!(T)) \
(T) = thread_add_timer (master, (F), rinfo, (V)); \
} while (0)
/* Macro for timer turn off. */
#define RIP_TIMER_OFF(X) \
do { \
if (X) \
{ \
thread_cancel (X); \
(X) = NULL; \
} \
} while (0)
/* Prototypes. */
extern void rip_init (void);
extern void rip_reset (void);
extern void rip_clean (void);
extern void rip_clean_network (void);
extern void rip_interface_clean (void);
extern void rip_interface_reset (void);
extern void rip_passive_nondefault_clean (void);
extern void rip_if_init (void);
extern void rip_if_down_all (void);
extern void rip_route_map_init (void);
extern void rip_route_map_reset (void);
extern void rip_snmp_init (void);
extern void rip_zclient_init(struct thread_master *);
extern void rip_zclient_start (void);
extern void rip_zclient_reset (void);
extern void rip_offset_init (void);
extern int if_check_address (struct in_addr addr);
extern int rip_request_send (struct sockaddr_in *, struct interface *, u_char,
struct connected *);
extern int rip_neighbor_lookup (struct sockaddr_in *);
extern int rip_redistribute_check (int);
extern void rip_redistribute_add (int, int, struct prefix_ipv4 *, unsigned int,
struct in_addr *, unsigned int, unsigned char);
extern void rip_redistribute_delete (int, int, struct prefix_ipv4 *, unsigned int);
extern void rip_redistribute_withdraw (int);
extern void rip_zebra_ipv4_add (struct prefix_ipv4 *, struct in_addr *, u_int32_t, u_char);
extern void rip_zebra_ipv4_delete (struct prefix_ipv4 *, struct in_addr *, u_int32_t);
extern void rip_interface_multicast_set (int, struct connected *);
extern void rip_distribute_update_interface (struct interface *);
extern void rip_if_rmap_update_interface (struct interface *);
extern int config_write_rip_network (struct vty *, int);
extern int config_write_rip_offset_list (struct vty *);
extern int config_write_rip_redistribute (struct vty *, int);
extern void rip_peer_init (void);
extern void rip_peer_update (struct sockaddr_in *, u_char);
extern void rip_peer_bad_route (struct sockaddr_in *);
extern void rip_peer_bad_packet (struct sockaddr_in *);
extern void rip_peer_display (struct vty *);
extern struct rip_peer *rip_peer_lookup (struct in_addr *);
extern struct rip_peer *rip_peer_lookup_next (struct in_addr *);
extern int rip_offset_list_apply_in (struct prefix_ipv4 *, struct interface *, u_int32_t *);
extern int rip_offset_list_apply_out (struct prefix_ipv4 *, struct interface *, u_int32_t *);
extern void rip_offset_clean (void);
extern void rip_info_free (struct rip_info *);
extern u_char rip_distance_apply (struct rip_info *);
extern void rip_redistribute_clean (void);
extern void rip_ifaddr_add (struct interface *, struct connected *);
extern void rip_ifaddr_delete (struct interface *, struct connected *);
/* There is only one rip strucutre. */
extern struct rip *rip;
/* Master thread strucutre. */
extern struct thread_master *master;
/* RIP statistics for SNMP. */
extern long rip_global_route_changes;
extern long rip_global_queries;
#endif /* _ZEBRA_RIP_H */
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