70e212f913
Interfaces for OSPF and RIP could be configured to use (and request) TTL 255 for traffic to direct neighbors. Thanks to Simon Dickhoven for the original patch for RIPng.
187 lines
4 KiB
C
187 lines
4 KiB
C
/*
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* Structures for RIP protocol
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*
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FIXME: in V6, they insert additional entry whenever next hop differs. Such entry is identified by 0xff in metric.
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*/
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#include "nest/route.h"
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#include "nest/password.h"
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#include "nest/locks.h"
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#define EA_RIP_TAG EA_CODE(EAP_RIP, 0)
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#define EA_RIP_METRIC EA_CODE(EAP_RIP, 1)
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#define PACKET_MAX 25
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#define PACKET_MD5_MAX 18 /* FIXME */
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#define RIP_V1 1
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#define RIP_V2 2
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#define RIP_NG 1 /* A new version numbering */
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#ifndef IPV6
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#define RIP_PORT 520 /* RIP for IPv4 */
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#else
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#define RIP_PORT 521 /* RIPng */
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#endif
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struct rip_connection {
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node n;
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int num;
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struct proto *proto;
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ip_addr addr;
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sock *send;
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struct rip_interface *rif;
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struct fib_iterator iter;
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ip_addr daddr;
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int dport;
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int done;
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};
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struct rip_packet_heading { /* 4 bytes */
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u8 command;
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#define RIPCMD_REQUEST 1 /* want info */
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#define RIPCMD_RESPONSE 2 /* responding to request */
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#define RIPCMD_TRACEON 3 /* turn tracing on */
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#define RIPCMD_TRACEOFF 4 /* turn it off */
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#define RIPCMD_MAX 5
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u8 version;
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#define RIP_V1 1
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#define RIP_V2 2
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#define RIP_NG 1 /* this is verion 1 of RIPng */
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u16 unused;
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};
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#ifndef IPV6
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struct rip_block { /* 20 bytes */
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u16 family; /* 0xffff on first message means this is authentication */
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u16 tag;
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ip_addr network;
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ip_addr netmask;
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ip_addr nexthop;
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u32 metric;
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};
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#else
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struct rip_block { /* IPv6 version!, 20 bytes, too */
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ip_addr network;
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u16 tag;
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u8 pxlen;
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u8 metric;
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};
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#endif
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struct rip_block_auth { /* 20 bytes */
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u16 mustbeFFFF;
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u16 authtype;
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u16 packetlen;
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u8 keyid;
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u8 authlen;
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u32 seq;
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u32 zero0;
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u32 zero1;
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};
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struct rip_md5_tail { /* 20 bytes */
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u16 mustbeFFFF;
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u16 mustbe0001;
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char md5[16];
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};
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struct rip_entry {
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struct fib_node n;
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ip_addr whotoldme;
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ip_addr nexthop;
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int metric;
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u16 tag;
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bird_clock_t updated, changed;
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int flags;
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};
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struct rip_packet {
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struct rip_packet_heading heading;
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struct rip_block block[PACKET_MAX];
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};
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struct rip_interface {
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node n;
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struct proto *proto;
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struct iface *iface;
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sock *sock;
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struct rip_connection *busy;
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int metric; /* You don't want to put struct rip_patt *patt here -- think about reconfigure */
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int mode;
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int check_ttl; /* Check incoming packets for TTL 255 */
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int triggered;
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struct object_lock *lock;
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int multicast;
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};
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struct rip_patt {
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struct iface_patt i;
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int metric; /* If you add entries here, don't forget to modify patt_compare! */
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int mode;
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#define IM_BROADCAST 2
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#define IM_QUIET 4
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#define IM_NOLISTEN 8
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#define IM_VERSION1 16
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int tx_tos;
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int tx_priority;
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int ttl_security; /* bool + 2 for TX only (send, but do not check on RX) */
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};
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struct rip_proto_config {
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struct proto_config c;
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list iface_list; /* Patterns configured -- keep it first; see rip_reconfigure why */
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list *passwords; /* Passwords, keep second */
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int infinity; /* User configurable data; must be comparable with memcmp */
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int port;
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int period;
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int garbage_time;
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int timeout_time;
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int authtype;
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#define AT_NONE 0
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#define AT_PLAINTEXT 2
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#define AT_MD5 3
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int honor;
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#define HO_NEVER 0
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#define HO_NEIGHBOR 1
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#define HO_ALWAYS 2
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};
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struct rip_proto {
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struct proto inherited;
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timer *timer;
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list connections;
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struct fib rtable;
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list garbage;
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list interfaces; /* Interfaces we really know about */
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#ifdef LOCAL_DEBUG
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int magic;
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#endif
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int tx_count; /* Do one regular update once in a while */
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int rnd_count; /* Randomize sending time */
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};
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#ifdef LOCAL_DEBUG
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#define RIP_MAGIC 81861253
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#define CHK_MAGIC do { if (P->magic != RIP_MAGIC) bug( "Not enough magic" ); } while (0)
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#else
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#define CHK_MAGIC do { } while (0)
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#endif
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void rip_init_instance(struct proto *p);
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void rip_init_config(struct rip_proto_config *c);
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/* Authentication functions */
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int rip_incoming_authentication( struct proto *p, struct rip_block_auth *block, struct rip_packet *packet, int num, ip_addr whotoldme );
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int rip_outgoing_authentication( struct proto *p, struct rip_block_auth *block, struct rip_packet *packet, int num );
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