2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (c) 1983, 1988, 1993
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31 * @(#)defs.h 8.1 (Berkeley) 6/5/93
37 /* Definitions for RIPv2 routing process.
39 * This code is based on the 4.4BSD `routed` daemon, with extensions to
41 * RIPv2, including variable length subnet masks.
43 * aggregate routes in the kernel tables.
44 * aggregate advertised routes.
45 * maintain spare routes for faster selection of another gateway
46 * when the current gateway dies.
47 * timers on routes with second granularity so that selection
48 * of a new route does not wait 30-60 seconds.
49 * tolerance of static routes.
50 * tell the kernel hop counts
51 * do not advertise if ipforwarding=0
53 * The vestigial support for other protocols has been removed. There
54 * is no likelihood that IETF RIPv1 or RIPv2 will ever be used with
55 * other protocols. The result is far smaller, faster, cleaner, and
56 * perhaps understandable.
58 * The accumulation of special flags and kludges added over the many
59 * years have been simplified and integrated.
72 #include <sys/cdefs.h>
74 #include <sys/types.h>
75 #include <sys/param.h>
76 #include <sys/ioctl.h>
77 #include <sys/sysctl.h>
78 #include <sys/socket.h>
79 #include <sys/queue.h>
81 #define UNUSED __attribute__((unused))
82 #define PATTRIB(f,l) __attribute__((format (printf,f,l)))
84 #include <net/route.h>
85 #include <net/if_dl.h>
86 #include <netinet/in.h>
87 #include <arpa/inet.h>
88 #define RIPVERSION RIPv2
89 #include <protocols/routed.h>
92 #define __RCSID(_s) static const char rcsid[] UNUSED = _s
95 #define __COPYRIGHT(_s) static const char copyright[] UNUSED = _s
98 /* Type of an IP address.
99 * Some systems do not like to pass structures, so do not use in_addr.
100 * Some systems think a long has 64 bits, which would be a gross waste.
101 * So define it here so it can be changed for the target system.
102 * It should be defined somewhere netinet/in.h, but it is not.
106 #define _HAVE_SIN_LEN
108 #define DAY (24*60*60)
109 #define NEVER DAY /* a long time */
110 #define EPOCH NEVER /* bias time by this to avoid <0 */
112 /* Scan the kernel regularly to see if any interfaces have appeared or been
113 * turned off. These must be less than STALE_TIME.
115 #define CHECK_BAD_INTERVAL 5 /* when an interface is known bad */
116 #define CHECK_ACT_INTERVAL 30 /* when advertising */
117 #define CHECK_QUIET_INTERVAL 300 /* when not */
119 #define LIM_SEC(s,l) ((s).tv_sec = MIN((s).tv_sec, (l)))
121 /* Metric used for fake default routes. It ought to be 15, but when
122 * processing advertised routes, previous versions of `routed` added
123 * to the received metric and discarded the route if the total was 16
126 #define FAKE_METRIC (HOPCNT_INFINITY-2)
129 /* Router Discovery parameters */
130 #define INADDR_ALLROUTERS_GROUP 0xe0000002 /* 224.0.0.2 */
131 #define MaxMaxAdvertiseInterval 1800
132 #define MinMaxAdvertiseInterval 4
133 #define DefMaxAdvertiseInterval 600
134 #define MIN_PreferenceLevel 0x80000000
136 #define MAX_INITIAL_ADVERT_INTERVAL 16
137 #define MAX_INITIAL_ADVERTS 3
139 #define MAX_SOLICITATION_DELAY 1
140 #define SOLICITATION_INTERVAL 3
141 #define MAX_SOLICITATIONS 3
144 /* Bloated packet size for systems that simply add authentication to
147 #define OVER_MAXPACKETSIZE (MAXPACKETSIZE+sizeof(struct netinfo)*2)
148 /* typical packet buffers */
150 char packet[OVER_MAXPACKETSIZE*2];
154 #define GNAME_LEN 64 /* assumed=64 in parms.c */
155 /* bigger than IFNAMSIZ, with room for "external()" or "remote()" */
156 #define IF_NAME_LEN (GNAME_LEN+15)
158 /* No more routes than this, to protect ourself in case something goes
159 * whacko and starts broadcasting zillions of bogus routes.
161 #define MAX_ROUTES (128*1024)
162 extern int total_routes;
164 /* Main, daemon routing table structure
167 struct radix_node rt_nodes[2]; /* radix tree glue */
169 # define RS_IF 0x001 /* for network interface */
170 # define RS_NET_INT 0x002 /* authority route */
171 # define RS_NET_SYN 0x004 /* fake net route for subnet */
172 # define RS_NO_NET_SYN (RS_LOCAL | RS_LOCAL | RS_IF)
173 # define RS_SUBNET 0x008 /* subnet route from any source */
174 # define RS_LOCAL 0x010 /* loopback for pt-to-pt */
175 # define RS_MHOME 0x020 /* from -m */
176 # define RS_STATIC 0x040 /* from the kernel */
177 # define RS_RDISC 0x080 /* from router discovery */
178 struct sockaddr_in rt_dst_sock;
181 struct interface *rts_ifp;
182 naddr rts_gate; /* forward packets here */
183 naddr rts_router; /* on the authority of this router */
186 time_t rts_time; /* timer to junk stale routes */
187 u_int rts_de_ag; /* de-aggregation level */
189 } rt_spares[NUM_SPARES];
190 u_int rt_seqno; /* when last changed */
191 char rt_poison_metric; /* to notice maximum recently */
192 time_t rt_poison_time; /* advertised metric */
194 #define rt_dst rt_dst_sock.sin_addr.s_addr
195 #define rt_ifp rt_spares[0].rts_ifp
196 #define rt_gate rt_spares[0].rts_gate
197 #define rt_router rt_spares[0].rts_router
198 #define rt_metric rt_spares[0].rts_metric
199 #define rt_tag rt_spares[0].rts_tag
200 #define rt_time rt_spares[0].rts_time
201 #define rt_de_ag rt_spares[0].rts_de_ag
203 #define HOST_MASK 0xffffffff
204 #define RT_ISHOST(rt) ((rt)->rt_mask == HOST_MASK)
206 /* age all routes that
207 * are not from -g, -m, or static routes from the kernel
208 * not unbroken interface routes
209 * but not broken interfaces
210 * nor non-passive, remote interfaces that are not aliases
211 * (i.e. remote & metric=0)
213 #define AGE_RT(rt_state,ifp) (0 == ((rt_state) & (RS_MHOME | RS_STATIC \
214 | RS_NET_SYN | RS_RDISC)) \
215 && (!((rt_state) & RS_IF) \
217 || (((ifp)->int_state & IS_REMOTE) \
218 && !((ifp)->int_state & IS_PASSIVE))))
220 /* true if A is better than B
222 * - A is not a poisoned route
223 * - and A is not stale
224 * - and A has a shorter path
225 * - or is the router speaking for itself
226 * - or the current route is equal but stale
227 * - or it is a host route advertised by a system for itself
229 #define BETTER_LINK(rt,A,B) ((A)->rts_metric < HOPCNT_INFINITY \
230 && now_stale <= (A)->rts_time \
231 && ((A)->rts_metric < (B)->rts_metric \
232 || ((A)->rts_gate == (A)->rts_router \
233 && (B)->rts_gate != (B)->rts_router) \
234 || ((A)->rts_metric == (B)->rts_metric \
235 && now_stale > (B)->rts_time) \
237 && (rt)->rt_dst == (A)->rts_router \
238 && (A)->rts_metric == (B)->rts_metric)))
241 /* An "interface" is similar to a kernel ifnet structure, except it also
242 * handles "logical" or "IS_REMOTE" interfaces (remote gateways).
245 LIST_ENTRY(interface) int_list;
246 LIST_ENTRY(interface) remote_list;
247 struct interface *int_ahash, **int_ahash_prev;
248 struct interface *int_bhash, **int_bhash_prev;
249 struct interface *int_nhash, **int_nhash_prev;
250 char int_name[IF_NAME_LEN+1];
252 naddr int_addr; /* address on this host (net order) */
253 naddr int_brdaddr; /* broadcast address (n) */
254 naddr int_dstaddr; /* other end of pt-to-pt link (n) */
255 naddr int_net; /* working network # (host order)*/
256 naddr int_mask; /* working net mask (host order) */
257 naddr int_ripv1_mask; /* for inferring a mask (n) */
258 naddr int_std_addr; /* class A/B/C address (n) */
259 naddr int_std_net; /* class A/B/C network (h) */
260 naddr int_std_mask; /* class A/B/C netmask (h) */
261 int int_rip_sock; /* for queries */
262 int int_if_flags; /* some bits copied from kernel */
264 time_t int_act_time; /* last thought healthy */
265 time_t int_query_time;
266 u_short int_transitions; /* times gone up-down */
268 u_char int_d_metric; /* for faked default route */
269 u_char int_adj_inmetric; /* adjust advertised metrics */
270 u_char int_adj_outmetric; /* instead of interface metric */
272 u_int ipackets; /* previous network stats */
276 time_t ts; /* timestamp on network stats */
278 # define MAX_AUTH_KEYS 5
279 struct auth { /* authentication info */
281 u_char key[RIP_AUTH_PW_LEN];
284 } int_auth[MAX_AUTH_KEYS];
285 /* router discovery parameters */
286 int int_rdisc_pref; /* signed preference to advertise */
287 int int_rdisc_int; /* MaxAdvertiseInterval */
289 struct timeval int_rdisc_timer;
292 /* bits in int_state */
293 #define IS_ALIAS 0x0000001 /* interface alias */
294 #define IS_SUBNET 0x0000002 /* interface on subnetted network */
295 #define IS_REMOTE 0x0000004 /* interface is not on this machine */
296 #define IS_PASSIVE 0x0000008 /* remote and does not do RIP */
297 #define IS_EXTERNAL 0x0000010 /* handled by EGP or something */
298 #define IS_CHECKED 0x0000020 /* still exists */
299 #define IS_ALL_HOSTS 0x0000040 /* in INADDR_ALLHOSTS_GROUP */
300 #define IS_ALL_ROUTERS 0x0000080 /* in INADDR_ALLROUTERS_GROUP */
301 #define IS_DISTRUST 0x0000100 /* ignore untrusted routers */
302 #define IS_REDIRECT_OK 0x0000200 /* accept ICMP redirects */
303 #define IS_BROKE 0x0000400 /* seems to be broken */
304 #define IS_SICK 0x0000800 /* seems to be broken */
305 #define IS_DUP 0x0001000 /* has a duplicate address */
306 #define IS_NEED_NET_SYN 0x0002000 /* need RS_NET_SYN route */
307 #define IS_NO_AG 0x0004000 /* do not aggregate subnets */
308 #define IS_NO_SUPER_AG 0x0008000 /* do not aggregate networks */
309 #define IS_NO_RIPV1_IN 0x0010000 /* no RIPv1 input at all */
310 #define IS_NO_RIPV2_IN 0x0020000 /* no RIPv2 input at all */
311 #define IS_NO_RIP_IN (IS_NO_RIPV1_IN | IS_NO_RIPV2_IN)
312 #define IS_RIP_IN_OFF(s) (((s) & IS_NO_RIP_IN) == IS_NO_RIP_IN)
313 #define IS_NO_RIPV1_OUT 0x0040000 /* no RIPv1 output at all */
314 #define IS_NO_RIPV2_OUT 0x0080000 /* no RIPv2 output at all */
315 #define IS_NO_RIP_OUT (IS_NO_RIPV1_OUT | IS_NO_RIPV2_OUT)
316 #define IS_NO_RIP (IS_NO_RIP_OUT | IS_NO_RIP_IN)
317 #define IS_RIP_OUT_OFF(s) (((s) & IS_NO_RIP_OUT) == IS_NO_RIP_OUT)
318 #define IS_RIP_OFF(s) (((s) & IS_NO_RIP) == IS_NO_RIP)
319 #define IS_NO_RIP_MCAST 0x0100000 /* broadcast RIPv2 */
320 #define IS_NO_ADV_IN 0x0200000 /* do not listen to advertisements */
321 #define IS_NO_SOL_OUT 0x0400000 /* send no solicitations */
322 #define IS_SOL_OUT 0x0800000 /* send solicitations */
323 #define GROUP_IS_SOL_OUT (IS_SOL_OUT | IS_NO_SOL_OUT)
324 #define IS_NO_ADV_OUT 0x1000000 /* do not advertise rdisc */
325 #define IS_ADV_OUT 0x2000000 /* advertise rdisc */
326 #define GROUP_IS_ADV_OUT (IS_NO_ADV_OUT | IS_ADV_OUT)
327 #define IS_BCAST_RDISC 0x4000000 /* broadcast instead of multicast */
328 #define IS_NO_RDISC (IS_NO_ADV_IN | IS_NO_SOL_OUT | IS_NO_ADV_OUT)
329 #define IS_PM_RDISC 0x8000000 /* poor-man's router discovery */
331 #define iff_up(f) ((f) & IFF_UP)
333 LIST_HEAD(ifhead, interface);
335 /* Information for aggregating routes */
336 #define NUM_AG_SLOTS 32
338 struct ag_info *ag_fine; /* slot with finer netmask */
339 struct ag_info *ag_cors; /* more coarse netmask */
340 naddr ag_dst_h; /* destination in host byte order */
344 char ag_metric; /* metric to be advertised */
345 char ag_pref; /* aggregate based on this */
349 #define AGS_SUPPRESS 0x001 /* combine with coarser mask */
350 #define AGS_AGGREGATE 0x002 /* synthesize combined routes */
351 #define AGS_REDUN0 0x004 /* redundant, finer routes output */
352 #define AGS_REDUN1 0x008
353 #define AG_IS_REDUN(state) (((state) & (AGS_REDUN0 | AGS_REDUN1)) \
354 == (AGS_REDUN0 | AGS_REDUN1))
355 #define AGS_GATEWAY 0x010 /* tell kernel RTF_GATEWAY */
356 #define AGS_IF 0x020 /* for an interface */
357 #define AGS_RIPV2 0x040 /* send only as RIPv2 */
358 #define AGS_FINE_GATE 0x080 /* ignore differing ag_gate when this
359 * has the finer netmask */
360 #define AGS_CORS_GATE 0x100 /* ignore differing gate when this
361 * has the coarser netmasks */
362 #define AGS_SPLIT_HZ 0x200 /* suppress for split horizon */
364 /* some bits are set if they are set on either route */
365 #define AGS_AGGREGATE_EITHER (AGS_RIPV2 | AGS_GATEWAY | \
366 AGS_SUPPRESS | AGS_CORS_GATE)
370 /* parameters for interfaces */
372 struct parm *parm_next;
373 char parm_name[IF_NAME_LEN+1];
377 u_char parm_d_metric;
378 u_char parm_adj_inmetric;
379 char parm_adj_outmetric;
380 u_int parm_int_state;
381 int parm_rdisc_pref; /* signed IRDP preference */
382 int parm_rdisc_int; /* IRDP advertising interval */
383 struct auth parm_auth[MAX_AUTH_KEYS];
386 /* authority for internal networks */
387 extern struct intnet {
388 struct intnet *intnet_next;
389 naddr intnet_addr; /* network byte order */
394 /* defined RIPv1 netmasks */
395 extern struct r1net {
396 struct r1net *r1net_next;
397 naddr r1net_net; /* host order */
402 /* trusted routers */
403 extern struct tgate {
404 struct tgate *tgate_next;
406 #define MAX_TGATE_NETS 32
408 naddr net; /* host order */
410 } tgate_nets[MAX_TGATE_NETS];
413 enum output_type {OUT_QUERY, OUT_UNICAST, OUT_BROADCAST, OUT_MULTICAST,
414 NO_OUT_MULTICAST, NO_OUT_RIPV2};
416 /* common output buffers */
417 extern struct ws_buf {
420 struct netinfo *base;
422 enum output_type type;
426 extern naddr myaddr; /* main address of this system */
428 extern int stopint; /* !=0 to stop */
430 extern int rip_sock; /* RIP socket */
431 extern const struct interface *rip_sock_mcast; /* current multicast interface */
432 extern int rt_sock; /* routing socket */
433 extern int rt_sock_seqno;
434 extern int rdisc_sock; /* router-discovery raw socket */
436 extern int supplier; /* process should supply updates */
437 extern int supplier_set; /* -s or -q requested */
438 extern int ridhosts; /* 1=reduce host routes */
439 extern int mhome; /* 1=want multi-homed host route */
440 extern int advertise_mhome; /* 1=must continue advertising it */
441 extern int auth_ok; /* 1=ignore auth if we do not care */
442 extern int insecure; /* Reply to special queries or not */
444 extern struct timeval clk; /* system clock's idea of time */
445 extern struct timeval epoch; /* system clock when started */
446 extern struct timeval now; /* current idea of time */
447 extern time_t now_stale;
448 extern time_t now_expire;
449 extern time_t now_garbage;
451 extern struct timeval age_timer; /* next check of old routes */
452 extern struct timeval no_flash; /* inhibit flash update until then */
453 extern struct timeval rdisc_timer; /* next advert. or solicitation */
454 extern int rdisc_ok; /* using solicited route */
456 extern struct timeval ifinit_timer; /* time to check interfaces */
458 extern naddr loopaddr; /* our address on loopback */
459 extern int tot_interfaces; /* # of remote and local interfaces */
460 extern int rip_interfaces; /* # of interfaces doing RIP */
461 extern struct ifhead ifnet; /* all interfaces */
462 extern struct ifhead remote_if; /* remote interfaces */
463 extern int have_ripv1_out; /* have a RIPv1 interface */
464 extern int need_flash; /* flash update needed */
465 extern struct timeval need_kern; /* need to update kernel table */
466 extern u_int update_seqno; /* a route has changed */
468 extern int tracelevel, new_tracelevel;
469 #define MAX_TRACELEVEL 4
470 #define TRACEKERNEL (tracelevel >= 4) /* log kernel changes */
471 #define TRACECONTENTS (tracelevel >= 3) /* display packet contents */
472 #define TRACEPACKETS (tracelevel >= 2) /* note packets */
473 #define TRACEACTIONS (tracelevel != 0)
474 extern FILE *ftrace; /* output trace file */
475 extern char inittracename[PATH_MAX];
477 extern struct radix_node_head *rhead;
481 void fix_sock(int, const char *);
482 void fix_select(void);
484 void rip_on(struct interface *);
487 int output(enum output_type, struct sockaddr_in *,
488 struct interface *, struct rip *, int);
489 void clr_ws_buf(struct ws_buf *, struct auth *);
490 void rip_query(void);
492 void supply(struct sockaddr_in *, struct interface *,
493 enum output_type, int, int, int);
495 void msglog(const char *, ...) PATTRIB(1,2);
501 # define MSG_SUBJECT_N 8
502 } subs[MSG_SUBJECT_N];
504 void msglim(struct msg_limit *, naddr,
505 const char *, ...) PATTRIB(3,4);
506 #define LOGERR(msg) msglog(msg ": %s", strerror(errno))
507 void logbad(int, const char *, ...) PATTRIB(2,3);
508 #define BADERR(dump,msg) logbad(dump,msg ": %s", strerror(errno))
510 #define DBGERR(dump,msg) BADERR(dump,msg)
512 #define DBGERR(dump,msg) LOGERR(msg)
514 char *naddr_ntoa(naddr);
515 const char *saddr_ntoa(struct sockaddr *);
517 void *rtmalloc(size_t, const char *);
518 void timevaladd(struct timeval *, struct timeval *);
519 void intvl_random(struct timeval *, u_long, u_long);
520 int getnet(char *, naddr *, naddr *);
521 int gethost(char *, naddr *);
523 const char *parse_parms(char *, int);
524 const char *check_parms(struct parm *);
525 void get_parms(struct interface *);
528 void trace_close(int);
529 void set_tracefile(const char *, const char *, int);
530 void tracelevel_msg(const char *, int);
531 void trace_off(const char*, ...) PATTRIB(1,2);
532 void set_tracelevel(void);
533 void trace_flush(void);
534 void trace_misc(const char *, ...) PATTRIB(1,2);
535 void trace_act(const char *, ...) PATTRIB(1,2);
536 void trace_pkt(const char *, ...) PATTRIB(1,2);
537 void trace_add_del(const char *, struct rt_entry *);
538 void trace_change(struct rt_entry *, u_int, struct rt_spare *,
540 void trace_if(const char *, struct interface *);
541 void trace_upslot(struct rt_entry *, struct rt_spare *,
543 void trace_rip(const char*, const char*, struct sockaddr_in *,
544 struct interface *, struct rip *, int);
545 char *addrname(naddr, naddr, int);
546 char *rtname(naddr, naddr, naddr);
548 void rdisc_age(naddr);
549 void set_rdisc_mg(struct interface *, int);
550 void set_supplier(void);
551 void if_bad_rdisc(struct interface *);
552 void if_ok_rdisc(struct interface *);
553 void read_rip(int, struct interface *);
556 void rdisc_adv(void);
557 void rdisc_sol(void);
559 void sigtrace_on(int);
560 void sigtrace_off(int);
562 void flush_kern(void);
565 void ag_flush(naddr, naddr, void (*)(struct ag_info *));
566 void ag_check(naddr, naddr, naddr, naddr, char, char, u_int,
567 u_short, u_short, void (*)(struct ag_info *));
568 void del_static(naddr, naddr, naddr, int);
569 void del_redirects(naddr, time_t);
570 struct rt_entry *rtget(naddr, naddr);
571 struct rt_entry *rtfind(naddr);
573 void rtadd(naddr, naddr, u_int, struct rt_spare *);
574 void rtchange(struct rt_entry *, u_int, struct rt_spare *, char *);
575 void rtdelete(struct rt_entry *);
576 void rts_delete(struct rt_entry *, struct rt_spare *);
577 void rtbad_sub(struct rt_entry *);
578 void rtswitch(struct rt_entry *, struct rt_spare *);
580 #define S_ADDR(x) (((struct sockaddr_in *)(x))->sin_addr.s_addr)
581 #define INFO_DST(I) ((I)->rti_info[RTAX_DST])
582 #define INFO_GATE(I) ((I)->rti_info[RTAX_GATEWAY])
583 #define INFO_MASK(I) ((I)->rti_info[RTAX_NETMASK])
584 #define INFO_IFA(I) ((I)->rti_info[RTAX_IFA])
585 #define INFO_AUTHOR(I) ((I)->rti_info[RTAX_AUTHOR])
586 #define INFO_BRD(I) ((I)->rti_info[RTAX_BRD])
587 void rt_xaddrs(struct rt_addrinfo *, struct sockaddr *, struct sockaddr *,
590 naddr std_mask(naddr);
591 naddr ripv1_mask_net(naddr, struct interface *);
592 naddr ripv1_mask_host(naddr,struct interface *);
593 #define on_net(a,net,mask) (((ntohl(a) ^ (net)) & (mask)) == 0)
594 int check_dst(naddr);
595 struct interface *check_dup(naddr, naddr, naddr, int);
596 int check_remote(struct interface *);
598 int walk_bad(struct radix_node *, struct walkarg *);
599 int if_ok(struct interface *, const char *);
600 void if_sick(struct interface *);
601 void if_link(struct interface *);
602 struct interface *ifwithaddr(naddr addr, int bcast, int remote);
603 struct interface *ifwithindex(u_short, int);
604 struct interface *iflookup(naddr);
606 struct auth *find_auth(struct interface *);
607 void end_md5_auth(struct ws_buf *, struct auth *);