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Makefile.depend
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Makefile.inc
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defs.h
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if.c
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parms.c
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radix.c
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radix.h
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routed.8
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rtquery
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trace.c
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Editing: defs.h
/*- * SPDX-License-Identifier: BSD-3-Clause * * Copyright (c) 1983, 1988, 1993 * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * @(#)defs.h 8.1 (Berkeley) 6/5/93 * * $FreeBSD$ */ /* Definitions for RIPv2 routing process. * * This code is based on the 4.4BSD `routed` daemon, with extensions to * support: * RIPv2, including variable length subnet masks. * Router Discovery * aggregate routes in the kernel tables. * aggregate advertised routes. * maintain spare routes for faster selection of another gateway * when the current gateway dies. * timers on routes with second granularity so that selection * of a new route does not wait 30-60 seconds. * tolerance of static routes. * tell the kernel hop counts * do not advertise if ipforwarding=0 * * The vestigial support for other protocols has been removed. There * is no likelihood that IETF RIPv1 or RIPv2 will ever be used with * other protocols. The result is far smaller, faster, cleaner, and * perhaps understandable. * * The accumulation of special flags and kludges added over the many * years have been simplified and integrated. */ #include <assert.h> #include <stdio.h> #include <netdb.h> #include <stdlib.h> #include <unistd.h> #include <errno.h> #include <string.h> #include <stdarg.h> #include <syslog.h> #include <time.h> #include <sys/cdefs.h> #include <sys/time.h> #include <sys/types.h> #include <sys/param.h> #include <sys/ioctl.h> #include <sys/sysctl.h> #include <sys/socket.h> #include <sys/queue.h> #include "radix.h" #define UNUSED __attribute__((unused)) #define PATTRIB(f,l) __attribute__((format (printf,f,l))) #include <net/if.h> #include <net/route.h> #include <net/if_dl.h> #include <netinet/in.h> #include <arpa/inet.h> #define RIPVERSION RIPv2 #include <protocols/routed.h> #ifndef __RCSID #define __RCSID(_s) static const char rcsid[] UNUSED = _s #endif #ifndef __COPYRIGHT #define __COPYRIGHT(_s) static const char copyright[] UNUSED = _s #endif /* Type of an IP address. * Some systems do not like to pass structures, so do not use in_addr. * Some systems think a long has 64 bits, which would be a gross waste. * So define it here so it can be changed for the target system. * It should be defined somewhere netinet/in.h, but it is not. */ #define naddr u_long #define _HAVE_SA_LEN #define _HAVE_SIN_LEN #define DAY (24*60*60) #define NEVER DAY /* a long time */ #define EPOCH NEVER /* bias time by this to avoid <0 */ /* Scan the kernel regularly to see if any interfaces have appeared or been * turned off. These must be less than STALE_TIME. */ #define CHECK_BAD_INTERVAL 5 /* when an interface is known bad */ #define CHECK_ACT_INTERVAL 30 /* when advertising */ #define CHECK_QUIET_INTERVAL 300 /* when not */ #define LIM_SEC(s,l) ((s).tv_sec = MIN((s).tv_sec, (l))) /* Metric used for fake default routes. It ought to be 15, but when * processing advertised routes, previous versions of `routed` added * to the received metric and discarded the route if the total was 16 * or larger. */ #define FAKE_METRIC (HOPCNT_INFINITY-2) /* Router Discovery parameters */ #define INADDR_ALLROUTERS_GROUP 0xe0000002 /* 224.0.0.2 */ #define MaxMaxAdvertiseInterval 1800 #define MinMaxAdvertiseInterval 4 #define DefMaxAdvertiseInterval 600 #define MIN_PreferenceLevel 0x80000000 #define MAX_INITIAL_ADVERT_INTERVAL 16 #define MAX_INITIAL_ADVERTS 3 #define MAX_SOLICITATION_DELAY 1 #define SOLICITATION_INTERVAL 3 #define MAX_SOLICITATIONS 3 /* Bloated packet size for systems that simply add authentication to * full-sized packets */ #define OVER_MAXPACKETSIZE (MAXPACKETSIZE+sizeof(struct netinfo)*2) /* typical packet buffers */ union pkt_buf { char packet[OVER_MAXPACKETSIZE*2]; struct rip rip; }; #define GNAME_LEN 64 /* assumed=64 in parms.c */ /* bigger than IFNAMSIZ, with room for "external()" or "remote()" */ #define IF_NAME_LEN (GNAME_LEN+15) /* No more routes than this, to protect ourself in case something goes * whacko and starts broadcasting zillions of bogus routes. */ #define MAX_ROUTES (128*1024) extern int total_routes; /* Main, daemon routing table structure */ struct rt_entry { struct radix_node rt_nodes[2]; /* radix tree glue */ u_int rt_state; # define RS_IF 0x001 /* for network interface */ # define RS_NET_INT 0x002 /* authority route */ # define RS_NET_SYN 0x004 /* fake net route for subnet */ # define RS_NO_NET_SYN (RS_LOCAL | RS_LOCAL | RS_IF) # define RS_SUBNET 0x008 /* subnet route from any source */ # define RS_LOCAL 0x010 /* loopback for pt-to-pt */ # define RS_MHOME 0x020 /* from -m */ # define RS_STATIC 0x040 /* from the kernel */ # define RS_RDISC 0x080 /* from router discovery */ struct sockaddr_in rt_dst_sock; naddr rt_mask; struct rt_spare { struct interface *rts_ifp; naddr rts_gate; /* forward packets here */ naddr rts_router; /* on the authority of this router */ char rts_metric; u_short rts_tag; time_t rts_time; /* timer to junk stale routes */ u_int rts_de_ag; /* de-aggregation level */ #define NUM_SPARES 4 } rt_spares[NUM_SPARES]; u_int rt_seqno; /* when last changed */ char rt_poison_metric; /* to notice maximum recently */ time_t rt_poison_time; /* advertised metric */ }; #define rt_dst rt_dst_sock.sin_addr.s_addr #define rt_ifp rt_spares[0].rts_ifp #define rt_gate rt_spares[0].rts_gate #define rt_router rt_spares[0].rts_router #define rt_metric rt_spares[0].rts_metric #define rt_tag rt_spares[0].rts_tag #define rt_time rt_spares[0].rts_time #define rt_de_ag rt_spares[0].rts_de_ag #define HOST_MASK 0xffffffff #define RT_ISHOST(rt) ((rt)->rt_mask == HOST_MASK) /* age all routes that * are not from -g, -m, or static routes from the kernel * not unbroken interface routes * but not broken interfaces * nor non-passive, remote interfaces that are not aliases * (i.e. remote & metric=0) */ #define AGE_RT(rt_state,ifp) (0 == ((rt_state) & (RS_MHOME | RS_STATIC \ | RS_NET_SYN | RS_RDISC)) \ && (!((rt_state) & RS_IF) \ || (ifp) == 0 \ || (((ifp)->int_state & IS_REMOTE) \ && !((ifp)->int_state & IS_PASSIVE)))) /* true if A is better than B * Better if * - A is not a poisoned route * - and A is not stale * - and A has a shorter path * - or is the router speaking for itself * - or the current route is equal but stale * - or it is a host route advertised by a system for itself */ #define BETTER_LINK(rt,A,B) ((A)->rts_metric < HOPCNT_INFINITY \ && now_stale <= (A)->rts_time \ && ((A)->rts_metric < (B)->rts_metric \ || ((A)->rts_gate == (A)->rts_router \ && (B)->rts_gate != (B)->rts_router) \ || ((A)->rts_metric == (B)->rts_metric \ && now_stale > (B)->rts_time) \ || (RT_ISHOST(rt) \ && (rt)->rt_dst == (A)->rts_router \ && (A)->rts_metric == (B)->rts_metric))) /* An "interface" is similar to a kernel ifnet structure, except it also * handles "logical" or "IS_REMOTE" interfaces (remote gateways). */ struct interface { LIST_ENTRY(interface) int_list; LIST_ENTRY(interface) remote_list; struct interface *int_ahash, **int_ahash_prev; struct interface *int_bhash, **int_bhash_prev; struct interface *int_nhash, **int_nhash_prev; char int_name[IF_NAME_LEN+1]; u_short int_index; naddr int_addr; /* address on this host (net order) */ naddr int_brdaddr; /* broadcast address (n) */ naddr int_dstaddr; /* other end of pt-to-pt link (n) */ naddr int_net; /* working network # (host order)*/ naddr int_mask; /* working net mask (host order) */ naddr int_ripv1_mask; /* for inferring a mask (n) */ naddr int_std_addr; /* class A/B/C address (n) */ naddr int_std_net; /* class A/B/C network (h) */ naddr int_std_mask; /* class A/B/C netmask (h) */ int int_rip_sock; /* for queries */ int int_if_flags; /* some bits copied from kernel */ u_int int_state; time_t int_act_time; /* last thought healthy */ time_t int_query_time; u_short int_transitions; /* times gone up-down */ char int_metric; u_char int_d_metric; /* for faked default route */ u_char int_adj_inmetric; /* adjust advertised metrics */ u_char int_adj_outmetric; /* instead of interface metric */ struct int_data { u_int ipackets; /* previous network stats */ u_int ierrors; u_int opackets; u_int oerrors; time_t ts; /* timestamp on network stats */ } int_data; # define MAX_AUTH_KEYS 5 struct auth { /* authentication info */ u_int16_t type; u_char key[RIP_AUTH_PW_LEN]; u_char keyid; time_t start, end; } int_auth[MAX_AUTH_KEYS]; /* router discovery parameters */ int int_rdisc_pref; /* signed preference to advertise */ int int_rdisc_int; /* MaxAdvertiseInterval */ int int_rdisc_cnt; struct timeval int_rdisc_timer; }; /* bits in int_state */ #define IS_ALIAS 0x0000001 /* interface alias */ #define IS_SUBNET 0x0000002 /* interface on subnetted network */ #define IS_REMOTE 0x0000004 /* interface is not on this machine */ #define IS_PASSIVE 0x0000008 /* remote and does not do RIP */ #define IS_EXTERNAL 0x0000010 /* handled by EGP or something */ #define IS_CHECKED 0x0000020 /* still exists */ #define IS_ALL_HOSTS 0x0000040 /* in INADDR_ALLHOSTS_GROUP */ #define IS_ALL_ROUTERS 0x0000080 /* in INADDR_ALLROUTERS_GROUP */ #define IS_DISTRUST 0x0000100 /* ignore untrusted routers */ #define IS_REDIRECT_OK 0x0000200 /* accept ICMP redirects */ #define IS_BROKE 0x0000400 /* seems to be broken */ #define IS_SICK 0x0000800 /* seems to be broken */ #define IS_DUP 0x0001000 /* has a duplicate address */ #define IS_NEED_NET_SYN 0x0002000 /* need RS_NET_SYN route */ #define IS_NO_AG 0x0004000 /* do not aggregate subnets */ #define IS_NO_SUPER_AG 0x0008000 /* do not aggregate networks */ #define IS_NO_RIPV1_IN 0x0010000 /* no RIPv1 input at all */ #define IS_NO_RIPV2_IN 0x0020000 /* no RIPv2 input at all */ #define IS_NO_RIP_IN (IS_NO_RIPV1_IN | IS_NO_RIPV2_IN) #define IS_RIP_IN_OFF(s) (((s) & IS_NO_RIP_IN) == IS_NO_RIP_IN) #define IS_NO_RIPV1_OUT 0x0040000 /* no RIPv1 output at all */ #define IS_NO_RIPV2_OUT 0x0080000 /* no RIPv2 output at all */ #define IS_NO_RIP_OUT (IS_NO_RIPV1_OUT | IS_NO_RIPV2_OUT) #define IS_NO_RIP (IS_NO_RIP_OUT | IS_NO_RIP_IN) #define IS_RIP_OUT_OFF(s) (((s) & IS_NO_RIP_OUT) == IS_NO_RIP_OUT) #define IS_RIP_OFF(s) (((s) & IS_NO_RIP) == IS_NO_RIP) #define IS_NO_RIP_MCAST 0x0100000 /* broadcast RIPv2 */ #define IS_NO_ADV_IN 0x0200000 /* do not listen to advertisements */ #define IS_NO_SOL_OUT 0x0400000 /* send no solicitations */ #define IS_SOL_OUT 0x0800000 /* send solicitations */ #define GROUP_IS_SOL_OUT (IS_SOL_OUT | IS_NO_SOL_OUT) #define IS_NO_ADV_OUT 0x1000000 /* do not advertise rdisc */ #define IS_ADV_OUT 0x2000000 /* advertise rdisc */ #define GROUP_IS_ADV_OUT (IS_NO_ADV_OUT | IS_ADV_OUT) #define IS_BCAST_RDISC 0x4000000 /* broadcast instead of multicast */ #define IS_NO_RDISC (IS_NO_ADV_IN | IS_NO_SOL_OUT | IS_NO_ADV_OUT) #define IS_PM_RDISC 0x8000000 /* poor-man's router discovery */ #define iff_up(f) ((f) & IFF_UP) LIST_HEAD(ifhead, interface); /* Information for aggregating routes */ #define NUM_AG_SLOTS 32 struct ag_info { struct ag_info *ag_fine; /* slot with finer netmask */ struct ag_info *ag_cors; /* more coarse netmask */ naddr ag_dst_h; /* destination in host byte order */ naddr ag_mask; naddr ag_gate; naddr ag_nhop; char ag_metric; /* metric to be advertised */ char ag_pref; /* aggregate based on this */ u_int ag_seqno; u_short ag_tag; u_short ag_state; #define AGS_SUPPRESS 0x001 /* combine with coarser mask */ #define AGS_AGGREGATE 0x002 /* synthesize combined routes */ #define AGS_REDUN0 0x004 /* redundant, finer routes output */ #define AGS_REDUN1 0x008 #define AG_IS_REDUN(state) (((state) & (AGS_REDUN0 | AGS_REDUN1)) \ == (AGS_REDUN0 | AGS_REDUN1)) #define AGS_GATEWAY 0x010 /* tell kernel RTF_GATEWAY */ #define AGS_IF 0x020 /* for an interface */ #define AGS_RIPV2 0x040 /* send only as RIPv2 */ #define AGS_FINE_GATE 0x080 /* ignore differing ag_gate when this * has the finer netmask */ #define AGS_CORS_GATE 0x100 /* ignore differing gate when this * has the coarser netmasks */ #define AGS_SPLIT_HZ 0x200 /* suppress for split horizon */ /* some bits are set if they are set on either route */ #define AGS_AGGREGATE_EITHER (AGS_RIPV2 | AGS_GATEWAY | \ AGS_SUPPRESS | AGS_CORS_GATE) }; /* parameters for interfaces */ struct parm { struct parm *parm_next; char parm_name[IF_NAME_LEN+1]; naddr parm_net; naddr parm_mask; u_char parm_d_metric; u_char parm_adj_inmetric; char parm_adj_outmetric; u_int parm_int_state; int parm_rdisc_pref; /* signed IRDP preference */ int parm_rdisc_int; /* IRDP advertising interval */ struct auth parm_auth[MAX_AUTH_KEYS]; }; /* authority for internal networks */ extern struct intnet { struct intnet *intnet_next; naddr intnet_addr; /* network byte order */ naddr intnet_mask; char intnet_metric; } *intnets; /* defined RIPv1 netmasks */ extern struct r1net { struct r1net *r1net_next; naddr r1net_net; /* host order */ naddr r1net_match; naddr r1net_mask; } *r1nets; /* trusted routers */ extern struct tgate { struct tgate *tgate_next; naddr tgate_addr; #define MAX_TGATE_NETS 32 struct tgate_net { naddr net; /* host order */ naddr mask; } tgate_nets[MAX_TGATE_NETS]; } *tgates; enum output_type {OUT_QUERY, OUT_UNICAST, OUT_BROADCAST, OUT_MULTICAST, NO_OUT_MULTICAST, NO_OUT_RIPV2}; /* common output buffers */ extern struct ws_buf { struct rip *buf; struct netinfo *n; struct netinfo *base; struct netinfo *lim; enum output_type type; } v12buf; extern pid_t mypid; extern naddr myaddr; /* main address of this system */ extern int stopint; /* !=0 to stop */ extern int rip_sock; /* RIP socket */ extern const struct interface *rip_sock_mcast; /* current multicast interface */ extern int rt_sock; /* routing socket */ extern int rt_sock_seqno; extern int rdisc_sock; /* router-discovery raw socket */ extern int supplier; /* process should supply updates */ extern int supplier_set; /* -s or -q requested */ extern int ridhosts; /* 1=reduce host routes */ extern int mhome; /* 1=want multi-homed host route */ extern int advertise_mhome; /* 1=must continue advertising it */ extern int auth_ok; /* 1=ignore auth if we do not care */ extern int insecure; /* Reply to special queries or not */ extern struct timeval clk; /* system clock's idea of time */ extern struct timeval epoch; /* system clock when started */ extern struct timeval now; /* current idea of time */ extern time_t now_stale; extern time_t now_expire; extern time_t now_garbage; extern struct timeval age_timer; /* next check of old routes */ extern struct timeval no_flash; /* inhibit flash update until then */ extern struct timeval rdisc_timer; /* next advert. or solicitation */ extern int rdisc_ok; /* using solicited route */ extern struct timeval ifinit_timer; /* time to check interfaces */ extern naddr loopaddr; /* our address on loopback */ extern int tot_interfaces; /* # of remote and local interfaces */ extern int rip_interfaces; /* # of interfaces doing RIP */ extern struct ifhead ifnet; /* all interfaces */ extern struct ifhead remote_if; /* remote interfaces */ extern int have_ripv1_out; /* have a RIPv1 interface */ extern int need_flash; /* flash update needed */ extern struct timeval need_kern; /* need to update kernel table */ extern u_int update_seqno; /* a route has changed */ extern int tracelevel, new_tracelevel; #define MAX_TRACELEVEL 4 #define TRACEKERNEL (tracelevel >= 4) /* log kernel changes */ #define TRACECONTENTS (tracelevel >= 3) /* display packet contents */ #define TRACEPACKETS (tracelevel >= 2) /* note packets */ #define TRACEACTIONS (tracelevel != 0) extern FILE *ftrace; /* output trace file */ extern char inittracename[PATH_MAX]; extern struct radix_node_head *rhead; void fix_sock(int, const char *); void fix_select(void); void rip_off(void); void rip_on(struct interface *); void bufinit(void); int output(enum output_type, struct sockaddr_in *, struct interface *, struct rip *, int); void clr_ws_buf(struct ws_buf *, struct auth *); void rip_query(void); void rip_bcast(int); void supply(struct sockaddr_in *, struct interface *, enum output_type, int, int, int); void msglog(const char *, ...) PATTRIB(1,2); struct msg_limit { time_t reuse; struct msg_sub { naddr addr; time_t until; # define MSG_SUBJECT_N 8 } subs[MSG_SUBJECT_N]; }; void msglim(struct msg_limit *, naddr, const char *, ...) PATTRIB(3,4); #define LOGERR(msg) msglog(msg ": %s", strerror(errno)) void logbad(int, const char *, ...) PATTRIB(2,3); #define BADERR(dump,msg) logbad(dump,msg ": %s", strerror(errno)) #ifdef DEBUG #define DBGERR(dump,msg) BADERR(dump,msg) #else #define DBGERR(dump,msg) LOGERR(msg) #endif char *naddr_ntoa(naddr); const char *saddr_ntoa(struct sockaddr *); void *rtmalloc(size_t, const char *); void timevaladd(struct timeval *, struct timeval *); void intvl_random(struct timeval *, u_long, u_long); int getnet(char *, naddr *, naddr *); int gethost(char *, naddr *); void gwkludge(void); const char *parse_parms(char *, int); const char *check_parms(struct parm *); void get_parms(struct interface *); void lastlog(void); void trace_close(int); void set_tracefile(const char *, const char *, int); void tracelevel_msg(const char *, int); void trace_off(const char*, ...) PATTRIB(1,2); void set_tracelevel(void); void trace_flush(void); void trace_misc(const char *, ...) PATTRIB(1,2); void trace_act(const char *, ...) PATTRIB(1,2); void trace_pkt(const char *, ...) PATTRIB(1,2); void trace_add_del(const char *, struct rt_entry *); void trace_change(struct rt_entry *, u_int, struct rt_spare *, const char *); void trace_if(const char *, struct interface *); void trace_upslot(struct rt_entry *, struct rt_spare *, struct rt_spare *); void trace_rip(const char*, const char*, struct sockaddr_in *, struct interface *, struct rip *, int); char *addrname(naddr, naddr, int); char *rtname(naddr, naddr, naddr); void rdisc_age(naddr); void set_rdisc_mg(struct interface *, int); void set_supplier(void); void if_bad_rdisc(struct interface *); void if_ok_rdisc(struct interface *); void read_rip(int, struct interface *); void read_rt(void); void read_d(void); void rdisc_adv(void); void rdisc_sol(void); void sigtrace_on(int); void sigtrace_off(int); void flush_kern(void); void age(naddr); void ag_flush(naddr, naddr, void (*)(struct ag_info *)); void ag_check(naddr, naddr, naddr, naddr, char, char, u_int, u_short, u_short, void (*)(struct ag_info *)); void del_static(naddr, naddr, naddr, int); void del_redirects(naddr, time_t); struct rt_entry *rtget(naddr, naddr); struct rt_entry *rtfind(naddr); void rtinit(void); void rtadd(naddr, naddr, u_int, struct rt_spare *); void rtchange(struct rt_entry *, u_int, struct rt_spare *, char *); void rtdelete(struct rt_entry *); void rts_delete(struct rt_entry *, struct rt_spare *); void rtbad_sub(struct rt_entry *); void rtswitch(struct rt_entry *, struct rt_spare *); #define S_ADDR(x) (((struct sockaddr_in *)(x))->sin_addr.s_addr) #define INFO_DST(I) ((I)->rti_info[RTAX_DST]) #define INFO_GATE(I) ((I)->rti_info[RTAX_GATEWAY]) #define INFO_MASK(I) ((I)->rti_info[RTAX_NETMASK]) #define INFO_IFA(I) ((I)->rti_info[RTAX_IFA]) #define INFO_AUTHOR(I) ((I)->rti_info[RTAX_AUTHOR]) #define INFO_BRD(I) ((I)->rti_info[RTAX_BRD]) void rt_xaddrs(struct rt_addrinfo *, struct sockaddr *, struct sockaddr *, int); naddr std_mask(naddr); naddr ripv1_mask_net(naddr, struct interface *); naddr ripv1_mask_host(naddr,struct interface *); #define on_net(a,net,mask) (((ntohl(a) ^ (net)) & (mask)) == 0) int check_dst(naddr); struct interface *check_dup(naddr, naddr, naddr, int); int check_remote(struct interface *); void ifinit(void); int walk_bad(struct radix_node *, struct walkarg *); int if_ok(struct interface *, const char *); void if_sick(struct interface *); void if_link(struct interface *); struct interface *ifwithaddr(naddr addr, int bcast, int remote); struct interface *ifwithindex(u_short, int); struct interface *iflookup(naddr); struct auth *find_auth(struct interface *); void end_md5_auth(struct ws_buf *, struct auth *); #include <md5.h>
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