17b6ab19dSGarrett Wollman /* 27b6ab19dSGarrett Wollman * Copyright (c) 1983, 1988, 1993 37b6ab19dSGarrett Wollman * The Regents of the University of California. All rights reserved. 47b6ab19dSGarrett Wollman * 57b6ab19dSGarrett Wollman * Redistribution and use in source and binary forms, with or without 67b6ab19dSGarrett Wollman * modification, are permitted provided that the following conditions 77b6ab19dSGarrett Wollman * are met: 87b6ab19dSGarrett Wollman * 1. Redistributions of source code must retain the above copyright 97b6ab19dSGarrett Wollman * notice, this list of conditions and the following disclaimer. 107b6ab19dSGarrett Wollman * 2. Redistributions in binary form must reproduce the above copyright 117b6ab19dSGarrett Wollman * notice, this list of conditions and the following disclaimer in the 127b6ab19dSGarrett Wollman * documentation and/or other materials provided with the distribution. 137b6ab19dSGarrett Wollman * 3. All advertising materials mentioning features or use of this software 147b6ab19dSGarrett Wollman * must display the following acknowledgement: 157b6ab19dSGarrett Wollman * This product includes software developed by the University of 167b6ab19dSGarrett Wollman * California, Berkeley and its contributors. 177b6ab19dSGarrett Wollman * 4. Neither the name of the University nor the names of its contributors 187b6ab19dSGarrett Wollman * may be used to endorse or promote products derived from this software 197b6ab19dSGarrett Wollman * without specific prior written permission. 207b6ab19dSGarrett Wollman * 217b6ab19dSGarrett Wollman * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 227b6ab19dSGarrett Wollman * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 237b6ab19dSGarrett Wollman * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 247b6ab19dSGarrett Wollman * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 257b6ab19dSGarrett Wollman * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 267b6ab19dSGarrett Wollman * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 277b6ab19dSGarrett Wollman * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 287b6ab19dSGarrett Wollman * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 297b6ab19dSGarrett Wollman * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 307b6ab19dSGarrett Wollman * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 317b6ab19dSGarrett Wollman * SUCH DAMAGE. 327b6ab19dSGarrett Wollman */ 337b6ab19dSGarrett Wollman 3490100551SPhilippe Charnier #ifndef lint 3590100551SPhilippe Charnier #if 0 367b6ab19dSGarrett Wollman static char sccsid[] = "@(#)tables.c 8.1 (Berkeley) 6/5/93"; 377b6ab19dSGarrett Wollman #endif 3890100551SPhilippe Charnier static const char rcsid[] = 3990100551SPhilippe Charnier "$Id$"; 4090100551SPhilippe Charnier #endif /* not lint */ 417b6ab19dSGarrett Wollman 427b6ab19dSGarrett Wollman #include "defs.h" 437b6ab19dSGarrett Wollman 447b6ab19dSGarrett Wollman static struct rt_spare *rts_better(struct rt_entry *); 457b6ab19dSGarrett Wollman 467b6ab19dSGarrett Wollman struct radix_node_head *rhead; /* root of the radix tree */ 477b6ab19dSGarrett Wollman 487b6ab19dSGarrett Wollman int need_flash = 1; /* flash update needed 497b6ab19dSGarrett Wollman * start =1 to suppress the 1st 507b6ab19dSGarrett Wollman */ 517b6ab19dSGarrett Wollman 527b6ab19dSGarrett Wollman struct timeval age_timer; /* next check of old routes */ 537b6ab19dSGarrett Wollman struct timeval need_kern = { /* need to update kernel table */ 547b6ab19dSGarrett Wollman EPOCH+MIN_WAITTIME-1 557b6ab19dSGarrett Wollman }; 567b6ab19dSGarrett Wollman 577b6ab19dSGarrett Wollman int stopint; 587b6ab19dSGarrett Wollman 597b6ab19dSGarrett Wollman int total_routes; 607b6ab19dSGarrett Wollman 6152ad6021SGarrett Wollman /* zap any old routes through this gateway */ 627b6ab19dSGarrett Wollman naddr age_bad_gate; 637b6ab19dSGarrett Wollman 647b6ab19dSGarrett Wollman 657b6ab19dSGarrett Wollman /* It is desirable to "aggregate" routes, to combine differing routes of 667b6ab19dSGarrett Wollman * the same metric and next hop into a common route with a smaller netmask 677b6ab19dSGarrett Wollman * or to suppress redundant routes, routes that add no information to 687b6ab19dSGarrett Wollman * routes with smaller netmasks. 697b6ab19dSGarrett Wollman * 707b6ab19dSGarrett Wollman * A route is redundant if and only if any and all routes with smaller 717b6ab19dSGarrett Wollman * but matching netmasks and nets are the same. Since routes are 727b6ab19dSGarrett Wollman * kept sorted in the radix tree, redundant routes always come second. 737b6ab19dSGarrett Wollman * 747b6ab19dSGarrett Wollman * There are two kinds of aggregations. First, two routes of the same bit 757b6ab19dSGarrett Wollman * mask and differing only in the least significant bit of the network 767b6ab19dSGarrett Wollman * number can be combined into a single route with a coarser mask. 777b6ab19dSGarrett Wollman * 787b6ab19dSGarrett Wollman * Second, a route can be suppressed in favor of another route with a more 797b6ab19dSGarrett Wollman * coarse mask provided no incompatible routes with intermediate masks 807b6ab19dSGarrett Wollman * are present. The second kind of aggregation involves suppressing routes. 817b6ab19dSGarrett Wollman * A route must not be suppressed if an incompatible route exists with 827b6ab19dSGarrett Wollman * an intermediate mask, since the suppressed route would be covered 837b6ab19dSGarrett Wollman * by the intermediate. 847b6ab19dSGarrett Wollman * 857b6ab19dSGarrett Wollman * This code relies on the radix tree walk encountering routes 867b6ab19dSGarrett Wollman * sorted first by address, with the smallest address first. 877b6ab19dSGarrett Wollman */ 887b6ab19dSGarrett Wollman 897b6ab19dSGarrett Wollman struct ag_info ag_slots[NUM_AG_SLOTS], *ag_avail, *ag_corsest, *ag_finest; 907b6ab19dSGarrett Wollman 917b6ab19dSGarrett Wollman /* #define DEBUG_AG */ 927b6ab19dSGarrett Wollman #ifdef DEBUG_AG 937b6ab19dSGarrett Wollman #define CHECK_AG() {int acnt = 0; struct ag_info *cag; \ 947b6ab19dSGarrett Wollman for (cag = ag_avail; cag != 0; cag = cag->ag_fine) \ 957b6ab19dSGarrett Wollman acnt++; \ 967b6ab19dSGarrett Wollman for (cag = ag_corsest; cag != 0; cag = cag->ag_fine) \ 977b6ab19dSGarrett Wollman acnt++; \ 987b6ab19dSGarrett Wollman if (acnt != NUM_AG_SLOTS) { \ 997b6ab19dSGarrett Wollman (void)fflush(stderr); \ 1007b6ab19dSGarrett Wollman abort(); \ 1017b6ab19dSGarrett Wollman } \ 1027b6ab19dSGarrett Wollman } 1037b6ab19dSGarrett Wollman #else 1047b6ab19dSGarrett Wollman #define CHECK_AG() 1057b6ab19dSGarrett Wollman #endif 1067b6ab19dSGarrett Wollman 1077b6ab19dSGarrett Wollman 1087b6ab19dSGarrett Wollman /* Output the contents of an aggregation table slot. 1097b6ab19dSGarrett Wollman * This function must always be immediately followed with the deletion 1107b6ab19dSGarrett Wollman * of the target slot. 1117b6ab19dSGarrett Wollman */ 1127b6ab19dSGarrett Wollman static void 1137b6ab19dSGarrett Wollman ag_out(struct ag_info *ag, 1147b6ab19dSGarrett Wollman void (*out)(struct ag_info *)) 1157b6ab19dSGarrett Wollman { 1167b6ab19dSGarrett Wollman struct ag_info *ag_cors; 1177b6ab19dSGarrett Wollman naddr bit; 1187b6ab19dSGarrett Wollman 1197b6ab19dSGarrett Wollman 1207b6ab19dSGarrett Wollman /* If we output both the even and odd twins, then the immediate parent, 1217b6ab19dSGarrett Wollman * if it is present, is redundant, unless the parent manages to 1227b6ab19dSGarrett Wollman * aggregate into something coarser. 1237b6ab19dSGarrett Wollman * On successive calls, this code detects the even and odd twins, 1247b6ab19dSGarrett Wollman * and marks the parent. 1257b6ab19dSGarrett Wollman * 1267b6ab19dSGarrett Wollman * Note that the order in which the radix tree code emits routes 1277b6ab19dSGarrett Wollman * ensures that the twins are seen before the parent is emitted. 1287b6ab19dSGarrett Wollman */ 1297b6ab19dSGarrett Wollman ag_cors = ag->ag_cors; 1307b6ab19dSGarrett Wollman if (ag_cors != 0 1317b6ab19dSGarrett Wollman && ag_cors->ag_mask == ag->ag_mask<<1 1327b6ab19dSGarrett Wollman && ag_cors->ag_dst_h == (ag->ag_dst_h & ag_cors->ag_mask)) { 1337b6ab19dSGarrett Wollman ag_cors->ag_state |= ((ag_cors->ag_dst_h == ag->ag_dst_h) 1347b6ab19dSGarrett Wollman ? AGS_REDUN0 1357b6ab19dSGarrett Wollman : AGS_REDUN1); 1367b6ab19dSGarrett Wollman } 1377b6ab19dSGarrett Wollman 1387b6ab19dSGarrett Wollman /* Skip it if this route is itself redundant. 1397b6ab19dSGarrett Wollman * 1407b6ab19dSGarrett Wollman * It is ok to change the contents of the slot here, since it is 1417b6ab19dSGarrett Wollman * always deleted next. 1427b6ab19dSGarrett Wollman */ 1437b6ab19dSGarrett Wollman if (ag->ag_state & AGS_REDUN0) { 1447b6ab19dSGarrett Wollman if (ag->ag_state & AGS_REDUN1) 1457b6ab19dSGarrett Wollman return; 1467b6ab19dSGarrett Wollman bit = (-ag->ag_mask) >> 1; 1477b6ab19dSGarrett Wollman ag->ag_dst_h |= bit; 1487b6ab19dSGarrett Wollman ag->ag_mask |= bit; 1497b6ab19dSGarrett Wollman 1507b6ab19dSGarrett Wollman } else if (ag->ag_state & AGS_REDUN1) { 1517b6ab19dSGarrett Wollman bit = (-ag->ag_mask) >> 1; 1527b6ab19dSGarrett Wollman ag->ag_mask |= bit; 1537b6ab19dSGarrett Wollman } 1547b6ab19dSGarrett Wollman out(ag); 1557b6ab19dSGarrett Wollman } 1567b6ab19dSGarrett Wollman 1577b6ab19dSGarrett Wollman 1587b6ab19dSGarrett Wollman static void 1597b6ab19dSGarrett Wollman ag_del(struct ag_info *ag) 1607b6ab19dSGarrett Wollman { 1617b6ab19dSGarrett Wollman CHECK_AG(); 1627b6ab19dSGarrett Wollman 1637b6ab19dSGarrett Wollman if (ag->ag_cors == 0) 1647b6ab19dSGarrett Wollman ag_corsest = ag->ag_fine; 1657b6ab19dSGarrett Wollman else 1667b6ab19dSGarrett Wollman ag->ag_cors->ag_fine = ag->ag_fine; 1677b6ab19dSGarrett Wollman 1687b6ab19dSGarrett Wollman if (ag->ag_fine == 0) 1697b6ab19dSGarrett Wollman ag_finest = ag->ag_cors; 1707b6ab19dSGarrett Wollman else 1717b6ab19dSGarrett Wollman ag->ag_fine->ag_cors = ag->ag_cors; 1727b6ab19dSGarrett Wollman 1737b6ab19dSGarrett Wollman ag->ag_fine = ag_avail; 1747b6ab19dSGarrett Wollman ag_avail = ag; 1757b6ab19dSGarrett Wollman 1767b6ab19dSGarrett Wollman CHECK_AG(); 1777b6ab19dSGarrett Wollman } 1787b6ab19dSGarrett Wollman 1797b6ab19dSGarrett Wollman 18090100551SPhilippe Charnier /* Flush routes waiting for aggregation. 1817b6ab19dSGarrett Wollman * This must not suppress a route unless it is known that among all 1827b6ab19dSGarrett Wollman * routes with coarser masks that match it, the one with the longest 1837b6ab19dSGarrett Wollman * mask is appropriate. This is ensured by scanning the routes 18490100551SPhilippe Charnier * in lexical order, and with the most restrictive mask first 1857b6ab19dSGarrett Wollman * among routes to the same destination. 1867b6ab19dSGarrett Wollman */ 1877b6ab19dSGarrett Wollman void 1887b6ab19dSGarrett Wollman ag_flush(naddr lim_dst_h, /* flush routes to here */ 1897b6ab19dSGarrett Wollman naddr lim_mask, /* matching this mask */ 1907b6ab19dSGarrett Wollman void (*out)(struct ag_info *)) 1917b6ab19dSGarrett Wollman { 1927b6ab19dSGarrett Wollman struct ag_info *ag, *ag_cors; 1937b6ab19dSGarrett Wollman naddr dst_h; 1947b6ab19dSGarrett Wollman 1957b6ab19dSGarrett Wollman 1967b6ab19dSGarrett Wollman for (ag = ag_finest; 1977b6ab19dSGarrett Wollman ag != 0 && ag->ag_mask >= lim_mask; 1987b6ab19dSGarrett Wollman ag = ag_cors) { 1997b6ab19dSGarrett Wollman ag_cors = ag->ag_cors; 2007b6ab19dSGarrett Wollman 2017b6ab19dSGarrett Wollman /* work on only the specified routes */ 2027b6ab19dSGarrett Wollman dst_h = ag->ag_dst_h; 2037b6ab19dSGarrett Wollman if ((dst_h & lim_mask) != lim_dst_h) 2047b6ab19dSGarrett Wollman continue; 2057b6ab19dSGarrett Wollman 2067b6ab19dSGarrett Wollman if (!(ag->ag_state & AGS_SUPPRESS)) 2077b6ab19dSGarrett Wollman ag_out(ag, out); 2087b6ab19dSGarrett Wollman 2097b6ab19dSGarrett Wollman else for ( ; ; ag_cors = ag_cors->ag_cors) { 2107b6ab19dSGarrett Wollman /* Look for a route that can suppress the 2117b6ab19dSGarrett Wollman * current route */ 2127b6ab19dSGarrett Wollman if (ag_cors == 0) { 2137b6ab19dSGarrett Wollman /* failed, so output it and look for 2147b6ab19dSGarrett Wollman * another route to work on 2157b6ab19dSGarrett Wollman */ 2167b6ab19dSGarrett Wollman ag_out(ag, out); 2177b6ab19dSGarrett Wollman break; 2187b6ab19dSGarrett Wollman } 2197b6ab19dSGarrett Wollman 2207b6ab19dSGarrett Wollman if ((dst_h & ag_cors->ag_mask) == ag_cors->ag_dst_h) { 2217b6ab19dSGarrett Wollman /* We found a route with a coarser mask that 2227b6ab19dSGarrett Wollman * aggregates the current target. 2237b6ab19dSGarrett Wollman * 2247b6ab19dSGarrett Wollman * If it has a different next hop, it 2257b6ab19dSGarrett Wollman * cannot replace the target, so output 2267b6ab19dSGarrett Wollman * the target. 2277b6ab19dSGarrett Wollman */ 2287b6ab19dSGarrett Wollman if (ag->ag_gate != ag_cors->ag_gate 2297b6ab19dSGarrett Wollman && !(ag->ag_state & AGS_FINE_GATE) 2307b6ab19dSGarrett Wollman && !(ag_cors->ag_state & AGS_CORS_GATE)) { 2317b6ab19dSGarrett Wollman ag_out(ag, out); 2327b6ab19dSGarrett Wollman break; 2337b6ab19dSGarrett Wollman } 2347b6ab19dSGarrett Wollman 2357b6ab19dSGarrett Wollman /* If the coarse route has a good enough 2367b6ab19dSGarrett Wollman * metric, it suppresses the target. 2377b6ab19dSGarrett Wollman */ 2387b6ab19dSGarrett Wollman if (ag_cors->ag_pref <= ag->ag_pref) { 2397b6ab19dSGarrett Wollman if (ag_cors->ag_seqno > ag->ag_seqno) 2407b6ab19dSGarrett Wollman ag_cors->ag_seqno = ag->ag_seqno; 2417b6ab19dSGarrett Wollman if (AG_IS_REDUN(ag->ag_state) 2427b6ab19dSGarrett Wollman && ag_cors->ag_mask==ag->ag_mask<<1) { 2437b6ab19dSGarrett Wollman if (ag_cors->ag_dst_h == dst_h) 2447b6ab19dSGarrett Wollman ag_cors->ag_state |= AGS_REDUN0; 2457b6ab19dSGarrett Wollman else 2467b6ab19dSGarrett Wollman ag_cors->ag_state |= AGS_REDUN1; 2477b6ab19dSGarrett Wollman } 2487b6ab19dSGarrett Wollman if (ag->ag_tag != ag_cors->ag_tag) 2497b6ab19dSGarrett Wollman ag_cors->ag_tag = 0; 2507b6ab19dSGarrett Wollman if (ag->ag_nhop != ag_cors->ag_nhop) 2517b6ab19dSGarrett Wollman ag_cors->ag_nhop = 0; 2527b6ab19dSGarrett Wollman break; 2537b6ab19dSGarrett Wollman } 2547b6ab19dSGarrett Wollman } 2557b6ab19dSGarrett Wollman } 2567b6ab19dSGarrett Wollman 2577b6ab19dSGarrett Wollman /* That route has either been output or suppressed */ 2587b6ab19dSGarrett Wollman ag_cors = ag->ag_cors; 2597b6ab19dSGarrett Wollman ag_del(ag); 2607b6ab19dSGarrett Wollman } 2617b6ab19dSGarrett Wollman 2627b6ab19dSGarrett Wollman CHECK_AG(); 2637b6ab19dSGarrett Wollman } 2647b6ab19dSGarrett Wollman 2657b6ab19dSGarrett Wollman 2667b6ab19dSGarrett Wollman /* Try to aggregate a route with previous routes. 2677b6ab19dSGarrett Wollman */ 2687b6ab19dSGarrett Wollman void 2697b6ab19dSGarrett Wollman ag_check(naddr dst, 2707b6ab19dSGarrett Wollman naddr mask, 2717b6ab19dSGarrett Wollman naddr gate, 2727b6ab19dSGarrett Wollman naddr nhop, 2737b6ab19dSGarrett Wollman char metric, 2747b6ab19dSGarrett Wollman char pref, 2757b6ab19dSGarrett Wollman u_int seqno, 2767b6ab19dSGarrett Wollman u_short tag, 2777b6ab19dSGarrett Wollman u_short state, 2787b6ab19dSGarrett Wollman void (*out)(struct ag_info *)) /* output using this */ 2797b6ab19dSGarrett Wollman { 2807b6ab19dSGarrett Wollman struct ag_info *ag, *nag, *ag_cors; 2817b6ab19dSGarrett Wollman naddr xaddr; 2827b6ab19dSGarrett Wollman int x; 2837b6ab19dSGarrett Wollman 2847b6ab19dSGarrett Wollman NTOHL(dst); 2857b6ab19dSGarrett Wollman 2867b6ab19dSGarrett Wollman /* Punt non-contiguous subnet masks. 2877b6ab19dSGarrett Wollman * 2887b6ab19dSGarrett Wollman * (X & -X) contains a single bit if and only if X is a power of 2. 2897b6ab19dSGarrett Wollman * (X + (X & -X)) == 0 if and only if X is a power of 2. 2907b6ab19dSGarrett Wollman */ 2917b6ab19dSGarrett Wollman if ((mask & -mask) + mask != 0) { 2927b6ab19dSGarrett Wollman struct ag_info nc_ag; 2937b6ab19dSGarrett Wollman 2947b6ab19dSGarrett Wollman nc_ag.ag_dst_h = dst; 2957b6ab19dSGarrett Wollman nc_ag.ag_mask = mask; 2967b6ab19dSGarrett Wollman nc_ag.ag_gate = gate; 2977b6ab19dSGarrett Wollman nc_ag.ag_nhop = nhop; 2987b6ab19dSGarrett Wollman nc_ag.ag_metric = metric; 2997b6ab19dSGarrett Wollman nc_ag.ag_pref = pref; 3007b6ab19dSGarrett Wollman nc_ag.ag_tag = tag; 3017b6ab19dSGarrett Wollman nc_ag.ag_state = state; 3027b6ab19dSGarrett Wollman nc_ag.ag_seqno = seqno; 3037b6ab19dSGarrett Wollman out(&nc_ag); 3047b6ab19dSGarrett Wollman return; 3057b6ab19dSGarrett Wollman } 3067b6ab19dSGarrett Wollman 3077b6ab19dSGarrett Wollman /* Search for the right slot in the aggregation table. 3087b6ab19dSGarrett Wollman */ 3097b6ab19dSGarrett Wollman ag_cors = 0; 3107b6ab19dSGarrett Wollman ag = ag_corsest; 3117b6ab19dSGarrett Wollman while (ag != 0) { 3127b6ab19dSGarrett Wollman if (ag->ag_mask >= mask) 3137b6ab19dSGarrett Wollman break; 3147b6ab19dSGarrett Wollman 3157b6ab19dSGarrett Wollman /* Suppress old routes (i.e. combine with compatible routes 3167b6ab19dSGarrett Wollman * with coarser masks) as we look for the right slot in the 3177b6ab19dSGarrett Wollman * aggregation table for the new route. 3187b6ab19dSGarrett Wollman * A route to an address less than the current destination 3197b6ab19dSGarrett Wollman * will not be affected by the current route or any route 3207b6ab19dSGarrett Wollman * seen hereafter. That means it is safe to suppress it. 32190100551SPhilippe Charnier * This check keeps poor routes (e.g. with large hop counts) 32290100551SPhilippe Charnier * from preventing suppression of finer routes. 3237b6ab19dSGarrett Wollman */ 3247b6ab19dSGarrett Wollman if (ag_cors != 0 3257b6ab19dSGarrett Wollman && ag->ag_dst_h < dst 3267b6ab19dSGarrett Wollman && (ag->ag_state & AGS_SUPPRESS) 3277b6ab19dSGarrett Wollman && ag_cors->ag_pref <= ag->ag_pref 3287b6ab19dSGarrett Wollman && (ag->ag_dst_h & ag_cors->ag_mask) == ag_cors->ag_dst_h 3297b6ab19dSGarrett Wollman && (ag_cors->ag_gate == ag->ag_gate 3307b6ab19dSGarrett Wollman || (ag->ag_state & AGS_FINE_GATE) 3317b6ab19dSGarrett Wollman || (ag_cors->ag_state & AGS_CORS_GATE))) { 3327b6ab19dSGarrett Wollman if (ag_cors->ag_seqno > ag->ag_seqno) 3337b6ab19dSGarrett Wollman ag_cors->ag_seqno = ag->ag_seqno; 3347b6ab19dSGarrett Wollman if (AG_IS_REDUN(ag->ag_state) 3357b6ab19dSGarrett Wollman && ag_cors->ag_mask==ag->ag_mask<<1) { 3367b6ab19dSGarrett Wollman if (ag_cors->ag_dst_h == dst) 3377b6ab19dSGarrett Wollman ag_cors->ag_state |= AGS_REDUN0; 3387b6ab19dSGarrett Wollman else 3397b6ab19dSGarrett Wollman ag_cors->ag_state |= AGS_REDUN1; 3407b6ab19dSGarrett Wollman } 3417b6ab19dSGarrett Wollman if (ag->ag_tag != ag_cors->ag_tag) 3427b6ab19dSGarrett Wollman ag_cors->ag_tag = 0; 3437b6ab19dSGarrett Wollman if (ag->ag_nhop != ag_cors->ag_nhop) 3447b6ab19dSGarrett Wollman ag_cors->ag_nhop = 0; 3457b6ab19dSGarrett Wollman ag_del(ag); 3467b6ab19dSGarrett Wollman CHECK_AG(); 3477b6ab19dSGarrett Wollman } else { 3487b6ab19dSGarrett Wollman ag_cors = ag; 3497b6ab19dSGarrett Wollman } 3507b6ab19dSGarrett Wollman ag = ag_cors->ag_fine; 3517b6ab19dSGarrett Wollman } 3527b6ab19dSGarrett Wollman 3537b6ab19dSGarrett Wollman /* If we find the even/odd twin of the new route, and if the 3547b6ab19dSGarrett Wollman * masks and so forth are equal, we can aggregate them. 3557b6ab19dSGarrett Wollman * We can probably promote one of the pair. 3567b6ab19dSGarrett Wollman * 3577b6ab19dSGarrett Wollman * Since the routes are encountered in lexical order, 3587b6ab19dSGarrett Wollman * the new route must be odd. However, the second or later 3597b6ab19dSGarrett Wollman * times around this loop, it could be the even twin promoted 3607b6ab19dSGarrett Wollman * from the even/odd pair of twins of the finer route. 3617b6ab19dSGarrett Wollman */ 3627b6ab19dSGarrett Wollman while (ag != 0 3637b6ab19dSGarrett Wollman && ag->ag_mask == mask 3647b6ab19dSGarrett Wollman && ((ag->ag_dst_h ^ dst) & (mask<<1)) == 0) { 3657b6ab19dSGarrett Wollman 3667b6ab19dSGarrett Wollman /* Here we know the target route and the route in the current 3677b6ab19dSGarrett Wollman * slot have the same netmasks and differ by at most the 3687b6ab19dSGarrett Wollman * last bit. They are either for the same destination, or 3697b6ab19dSGarrett Wollman * for an even/odd pair of destinations. 3707b6ab19dSGarrett Wollman */ 3717b6ab19dSGarrett Wollman if (ag->ag_dst_h == dst) { 3727b6ab19dSGarrett Wollman /* We have two routes to the same destination. 3737b6ab19dSGarrett Wollman * Routes are encountered in lexical order, so a 3747b6ab19dSGarrett Wollman * route is never promoted until the parent route is 3757b6ab19dSGarrett Wollman * already present. So we know that the new route is 3767b6ab19dSGarrett Wollman * a promoted pair and the route already in the slot 3777b6ab19dSGarrett Wollman * is the explicit route. 3787b6ab19dSGarrett Wollman * 3797b6ab19dSGarrett Wollman * Prefer the best route if their metrics differ, 3807b6ab19dSGarrett Wollman * or the promoted one if not, following a sort 3817b6ab19dSGarrett Wollman * of longest-match rule. 3827b6ab19dSGarrett Wollman */ 3837b6ab19dSGarrett Wollman if (pref <= ag->ag_pref) { 3847b6ab19dSGarrett Wollman ag->ag_gate = gate; 3857b6ab19dSGarrett Wollman ag->ag_nhop = nhop; 3867b6ab19dSGarrett Wollman ag->ag_tag = tag; 3877b6ab19dSGarrett Wollman ag->ag_metric = metric; 3887b6ab19dSGarrett Wollman ag->ag_pref = pref; 3897b6ab19dSGarrett Wollman x = ag->ag_state; 3907b6ab19dSGarrett Wollman ag->ag_state = state; 3917b6ab19dSGarrett Wollman state = x; 3927b6ab19dSGarrett Wollman } 3937b6ab19dSGarrett Wollman 3947b6ab19dSGarrett Wollman /* The sequence number controls flash updating, 3957b6ab19dSGarrett Wollman * and should be the smaller of the two. 3967b6ab19dSGarrett Wollman */ 3977b6ab19dSGarrett Wollman if (ag->ag_seqno > seqno) 3987b6ab19dSGarrett Wollman ag->ag_seqno = seqno; 3997b6ab19dSGarrett Wollman 4007b6ab19dSGarrett Wollman /* some bits are set if they are set on either route */ 4017b6ab19dSGarrett Wollman ag->ag_state |= (state & (AGS_PROMOTE_EITHER 4027b6ab19dSGarrett Wollman | AGS_REDUN0 | AGS_REDUN1)); 4037b6ab19dSGarrett Wollman return; 4047b6ab19dSGarrett Wollman } 4057b6ab19dSGarrett Wollman 4067b6ab19dSGarrett Wollman /* If one of the routes can be promoted and the other can 4077b6ab19dSGarrett Wollman * be suppressed, it may be possible to combine them or 4087b6ab19dSGarrett Wollman * worthwhile to promote one. 4097b6ab19dSGarrett Wollman * 4107b6ab19dSGarrett Wollman * Note that any route that can be promoted is always 4117b6ab19dSGarrett Wollman * marked to be eligible to be suppressed. 4127b6ab19dSGarrett Wollman */ 4137b6ab19dSGarrett Wollman if (!((state & AGS_PROMOTE) 4147b6ab19dSGarrett Wollman && (ag->ag_state & AGS_SUPPRESS)) 4157b6ab19dSGarrett Wollman && !((ag->ag_state & AGS_PROMOTE) 4167b6ab19dSGarrett Wollman && (state & AGS_SUPPRESS))) 4177b6ab19dSGarrett Wollman break; 4187b6ab19dSGarrett Wollman 4197b6ab19dSGarrett Wollman /* A pair of even/odd twin routes can be combined 4207b6ab19dSGarrett Wollman * if either is redundant, or if they are via the 4217b6ab19dSGarrett Wollman * same gateway and have the same metric. 4227b6ab19dSGarrett Wollman */ 4237b6ab19dSGarrett Wollman if (AG_IS_REDUN(ag->ag_state) 4247b6ab19dSGarrett Wollman || AG_IS_REDUN(state) 4257b6ab19dSGarrett Wollman || (ag->ag_gate == gate 4267b6ab19dSGarrett Wollman && ag->ag_pref == pref 4277b6ab19dSGarrett Wollman && (state & ag->ag_state & AGS_PROMOTE) != 0)) { 4287b6ab19dSGarrett Wollman 4297b6ab19dSGarrett Wollman /* We have both the even and odd pairs. 4307b6ab19dSGarrett Wollman * Since the routes are encountered in order, 4317b6ab19dSGarrett Wollman * the route in the slot must be the even twin. 4327b6ab19dSGarrett Wollman * 4337b6ab19dSGarrett Wollman * Combine and promote the pair of routes. 4347b6ab19dSGarrett Wollman */ 4357b6ab19dSGarrett Wollman if (seqno > ag->ag_seqno) 4367b6ab19dSGarrett Wollman seqno = ag->ag_seqno; 4377b6ab19dSGarrett Wollman if (!AG_IS_REDUN(state)) 4387b6ab19dSGarrett Wollman state &= ~AGS_REDUN1; 4397b6ab19dSGarrett Wollman if (AG_IS_REDUN(ag->ag_state)) 4407b6ab19dSGarrett Wollman state |= AGS_REDUN0; 4417b6ab19dSGarrett Wollman else 4427b6ab19dSGarrett Wollman state &= ~AGS_REDUN0; 4437b6ab19dSGarrett Wollman state |= (ag->ag_state & AGS_PROMOTE_EITHER); 4447b6ab19dSGarrett Wollman if (ag->ag_tag != tag) 4457b6ab19dSGarrett Wollman tag = 0; 4467b6ab19dSGarrett Wollman if (ag->ag_nhop != nhop) 4477b6ab19dSGarrett Wollman nhop = 0; 4487b6ab19dSGarrett Wollman 4497b6ab19dSGarrett Wollman /* Get rid of the even twin that was already 4507b6ab19dSGarrett Wollman * in the slot. 4517b6ab19dSGarrett Wollman */ 4527b6ab19dSGarrett Wollman ag_del(ag); 4537b6ab19dSGarrett Wollman 4547b6ab19dSGarrett Wollman } else if (ag->ag_pref >= pref 4557b6ab19dSGarrett Wollman && (ag->ag_state & AGS_PROMOTE)) { 4567b6ab19dSGarrett Wollman /* If we cannot combine the pair, maybe the route 4577b6ab19dSGarrett Wollman * with the worse metric can be promoted. 4587b6ab19dSGarrett Wollman * 4597b6ab19dSGarrett Wollman * Promote the old, even twin, by giving its slot 4607b6ab19dSGarrett Wollman * in the table to the new, odd twin. 4617b6ab19dSGarrett Wollman */ 4627b6ab19dSGarrett Wollman ag->ag_dst_h = dst; 4637b6ab19dSGarrett Wollman 4647b6ab19dSGarrett Wollman xaddr = ag->ag_gate; 4657b6ab19dSGarrett Wollman ag->ag_gate = gate; 4667b6ab19dSGarrett Wollman gate = xaddr; 4677b6ab19dSGarrett Wollman 4687b6ab19dSGarrett Wollman xaddr = ag->ag_nhop; 4697b6ab19dSGarrett Wollman ag->ag_nhop = nhop; 4707b6ab19dSGarrett Wollman nhop = xaddr; 4717b6ab19dSGarrett Wollman 4727b6ab19dSGarrett Wollman x = ag->ag_tag; 4737b6ab19dSGarrett Wollman ag->ag_tag = tag; 4747b6ab19dSGarrett Wollman tag = x; 4757b6ab19dSGarrett Wollman 4767b6ab19dSGarrett Wollman x = ag->ag_state; 4777b6ab19dSGarrett Wollman ag->ag_state = state; 4787b6ab19dSGarrett Wollman state = x; 4797b6ab19dSGarrett Wollman if (!AG_IS_REDUN(state)) 4807b6ab19dSGarrett Wollman state &= ~AGS_REDUN0; 4817b6ab19dSGarrett Wollman 4827b6ab19dSGarrett Wollman x = ag->ag_metric; 4837b6ab19dSGarrett Wollman ag->ag_metric = metric; 4847b6ab19dSGarrett Wollman metric = x; 4857b6ab19dSGarrett Wollman 4867b6ab19dSGarrett Wollman x = ag->ag_pref; 4877b6ab19dSGarrett Wollman ag->ag_pref = pref; 4887b6ab19dSGarrett Wollman pref = x; 4897b6ab19dSGarrett Wollman 4907b6ab19dSGarrett Wollman if (seqno >= ag->ag_seqno) 4917b6ab19dSGarrett Wollman seqno = ag->ag_seqno; 4927b6ab19dSGarrett Wollman else 4937b6ab19dSGarrett Wollman ag->ag_seqno = seqno; 4947b6ab19dSGarrett Wollman 4957b6ab19dSGarrett Wollman } else { 4967b6ab19dSGarrett Wollman if (!(state & AGS_PROMOTE)) 4977b6ab19dSGarrett Wollman break; /* cannot promote either twin */ 4987b6ab19dSGarrett Wollman 4997b6ab19dSGarrett Wollman /* promote the new, odd twin by shaving its 5007b6ab19dSGarrett Wollman * mask and address. 5017b6ab19dSGarrett Wollman */ 5027b6ab19dSGarrett Wollman if (seqno > ag->ag_seqno) 5037b6ab19dSGarrett Wollman seqno = ag->ag_seqno; 5047b6ab19dSGarrett Wollman else 5057b6ab19dSGarrett Wollman ag->ag_seqno = seqno; 5067b6ab19dSGarrett Wollman if (!AG_IS_REDUN(state)) 5077b6ab19dSGarrett Wollman state &= ~AGS_REDUN1; 5087b6ab19dSGarrett Wollman } 5097b6ab19dSGarrett Wollman 5107b6ab19dSGarrett Wollman mask <<= 1; 5117b6ab19dSGarrett Wollman dst &= mask; 5127b6ab19dSGarrett Wollman 5137b6ab19dSGarrett Wollman if (ag_cors == 0) { 5147b6ab19dSGarrett Wollman ag = ag_corsest; 5157b6ab19dSGarrett Wollman break; 5167b6ab19dSGarrett Wollman } 5177b6ab19dSGarrett Wollman ag = ag_cors; 5187b6ab19dSGarrett Wollman ag_cors = ag->ag_cors; 5197b6ab19dSGarrett Wollman } 5207b6ab19dSGarrett Wollman 5217b6ab19dSGarrett Wollman /* When we can no longer promote and combine routes, 5227b6ab19dSGarrett Wollman * flush the old route in the target slot. Also flush 5237b6ab19dSGarrett Wollman * any finer routes that we know will never be aggregated by 5247b6ab19dSGarrett Wollman * the new route. 5257b6ab19dSGarrett Wollman * 5267b6ab19dSGarrett Wollman * In case we moved toward coarser masks, 5277b6ab19dSGarrett Wollman * get back where we belong 5287b6ab19dSGarrett Wollman */ 5297b6ab19dSGarrett Wollman if (ag != 0 5307b6ab19dSGarrett Wollman && ag->ag_mask < mask) { 5317b6ab19dSGarrett Wollman ag_cors = ag; 5327b6ab19dSGarrett Wollman ag = ag->ag_fine; 5337b6ab19dSGarrett Wollman } 5347b6ab19dSGarrett Wollman 5357b6ab19dSGarrett Wollman /* Empty the target slot 5367b6ab19dSGarrett Wollman */ 5377b6ab19dSGarrett Wollman if (ag != 0 && ag->ag_mask == mask) { 5387b6ab19dSGarrett Wollman ag_flush(ag->ag_dst_h, ag->ag_mask, out); 5397b6ab19dSGarrett Wollman ag = (ag_cors == 0) ? ag_corsest : ag_cors->ag_fine; 5407b6ab19dSGarrett Wollman } 5417b6ab19dSGarrett Wollman 5427b6ab19dSGarrett Wollman #ifdef DEBUG_AG 5437b6ab19dSGarrett Wollman (void)fflush(stderr); 5447b6ab19dSGarrett Wollman if (ag == 0 && ag_cors != ag_finest) 5457b6ab19dSGarrett Wollman abort(); 5467b6ab19dSGarrett Wollman if (ag_cors == 0 && ag != ag_corsest) 5477b6ab19dSGarrett Wollman abort(); 5487b6ab19dSGarrett Wollman if (ag != 0 && ag->ag_cors != ag_cors) 5497b6ab19dSGarrett Wollman abort(); 5507b6ab19dSGarrett Wollman if (ag_cors != 0 && ag_cors->ag_fine != ag) 5517b6ab19dSGarrett Wollman abort(); 5527b6ab19dSGarrett Wollman CHECK_AG(); 5537b6ab19dSGarrett Wollman #endif 5547b6ab19dSGarrett Wollman 5557b6ab19dSGarrett Wollman /* Save the new route on the end of the table. 5567b6ab19dSGarrett Wollman */ 5577b6ab19dSGarrett Wollman nag = ag_avail; 5587b6ab19dSGarrett Wollman ag_avail = nag->ag_fine; 5597b6ab19dSGarrett Wollman 5607b6ab19dSGarrett Wollman nag->ag_dst_h = dst; 5617b6ab19dSGarrett Wollman nag->ag_mask = mask; 5627b6ab19dSGarrett Wollman nag->ag_gate = gate; 5637b6ab19dSGarrett Wollman nag->ag_nhop = nhop; 5647b6ab19dSGarrett Wollman nag->ag_metric = metric; 5657b6ab19dSGarrett Wollman nag->ag_pref = pref; 5667b6ab19dSGarrett Wollman nag->ag_tag = tag; 5677b6ab19dSGarrett Wollman nag->ag_state = state; 5687b6ab19dSGarrett Wollman nag->ag_seqno = seqno; 5697b6ab19dSGarrett Wollman 5707b6ab19dSGarrett Wollman nag->ag_fine = ag; 5717b6ab19dSGarrett Wollman if (ag != 0) 5727b6ab19dSGarrett Wollman ag->ag_cors = nag; 5737b6ab19dSGarrett Wollman else 5747b6ab19dSGarrett Wollman ag_finest = nag; 5757b6ab19dSGarrett Wollman nag->ag_cors = ag_cors; 5767b6ab19dSGarrett Wollman if (ag_cors == 0) 5777b6ab19dSGarrett Wollman ag_corsest = nag; 5787b6ab19dSGarrett Wollman else 5797b6ab19dSGarrett Wollman ag_cors->ag_fine = nag; 5807b6ab19dSGarrett Wollman CHECK_AG(); 5817b6ab19dSGarrett Wollman } 5827b6ab19dSGarrett Wollman 5837b6ab19dSGarrett Wollman 5847b6ab19dSGarrett Wollman static char * 5857b6ab19dSGarrett Wollman rtm_type_name(u_char type) 5867b6ab19dSGarrett Wollman { 5877b6ab19dSGarrett Wollman static char *rtm_types[] = { 5887b6ab19dSGarrett Wollman "RTM_ADD", 5897b6ab19dSGarrett Wollman "RTM_DELETE", 5907b6ab19dSGarrett Wollman "RTM_CHANGE", 5917b6ab19dSGarrett Wollman "RTM_GET", 5927b6ab19dSGarrett Wollman "RTM_LOSING", 5937b6ab19dSGarrett Wollman "RTM_REDIRECT", 5947b6ab19dSGarrett Wollman "RTM_MISS", 5957b6ab19dSGarrett Wollman "RTM_LOCK", 5967b6ab19dSGarrett Wollman "RTM_OLDADD", 5977b6ab19dSGarrett Wollman "RTM_OLDDEL", 5987b6ab19dSGarrett Wollman "RTM_RESOLVE", 5997b6ab19dSGarrett Wollman "RTM_NEWADDR", 6007b6ab19dSGarrett Wollman "RTM_DELADDR", 6017b6ab19dSGarrett Wollman "RTM_IFINFO" 6027b6ab19dSGarrett Wollman }; 6037b6ab19dSGarrett Wollman static char name0[10]; 6047b6ab19dSGarrett Wollman 6057b6ab19dSGarrett Wollman 6067b6ab19dSGarrett Wollman if (type > sizeof(rtm_types)/sizeof(rtm_types[0]) 6077b6ab19dSGarrett Wollman || type == 0) { 6087b6ab19dSGarrett Wollman sprintf(name0, "RTM type %#x", type); 6097b6ab19dSGarrett Wollman return name0; 6107b6ab19dSGarrett Wollman } else { 6117b6ab19dSGarrett Wollman return rtm_types[type-1]; 6127b6ab19dSGarrett Wollman } 6137b6ab19dSGarrett Wollman } 6147b6ab19dSGarrett Wollman 6157b6ab19dSGarrett Wollman 6167b6ab19dSGarrett Wollman /* Trim a mask in a sockaddr 617a455644fSJulian Elischer * Produce the index of the first zero byte. 618a455644fSJulian Elischer * i.e. Produce a index of 4 for an mask of 0. (default route) 6197b6ab19dSGarrett Wollman */ 6207b6ab19dSGarrett Wollman void 6217b6ab19dSGarrett Wollman #ifdef _HAVE_SIN_LEN 6227b6ab19dSGarrett Wollman masktrim(struct sockaddr_in *ap) 6237b6ab19dSGarrett Wollman #else 6247b6ab19dSGarrett Wollman masktrim(struct sockaddr_in_new *ap) 6257b6ab19dSGarrett Wollman #endif 6267b6ab19dSGarrett Wollman { 6277b6ab19dSGarrett Wollman register char *cp; 6287b6ab19dSGarrett Wollman 629a455644fSJulian Elischer ap->sin_port = 0xffff; /* buffer zone for default route */ 6307b6ab19dSGarrett Wollman cp = (char *)(&ap->sin_addr.s_addr+1); 6317b6ab19dSGarrett Wollman while (*--cp == 0) 6327b6ab19dSGarrett Wollman continue; 633a455644fSJulian Elischer /*ap->sin_port = 0x0;*/ /* may not be needed (who cares?)*/ 6347b6ab19dSGarrett Wollman ap->sin_len = cp - (char*)ap + 1; 6357b6ab19dSGarrett Wollman } 6367b6ab19dSGarrett Wollman 6377b6ab19dSGarrett Wollman 6387b6ab19dSGarrett Wollman /* Tell the kernel to add, delete or change a route 6397b6ab19dSGarrett Wollman */ 6407b6ab19dSGarrett Wollman static void 6417b6ab19dSGarrett Wollman rtioctl(int action, /* RTM_DELETE, etc */ 6427b6ab19dSGarrett Wollman naddr dst, 6437b6ab19dSGarrett Wollman naddr gate, 6447b6ab19dSGarrett Wollman naddr mask, 6457b6ab19dSGarrett Wollman int metric, 6467b6ab19dSGarrett Wollman int flags) 6477b6ab19dSGarrett Wollman { 6487b6ab19dSGarrett Wollman struct { 6497b6ab19dSGarrett Wollman struct rt_msghdr w_rtm; 6507b6ab19dSGarrett Wollman struct sockaddr_in w_dst; 6517b6ab19dSGarrett Wollman struct sockaddr_in w_gate; 6527b6ab19dSGarrett Wollman #ifdef _HAVE_SA_LEN 6537b6ab19dSGarrett Wollman struct sockaddr_in w_mask; 6547b6ab19dSGarrett Wollman #else 6557b6ab19dSGarrett Wollman struct sockaddr_in_new w_mask; 6567b6ab19dSGarrett Wollman #endif 6577b6ab19dSGarrett Wollman } w; 6587b6ab19dSGarrett Wollman long cc; 6597b6ab19dSGarrett Wollman 6607b6ab19dSGarrett Wollman again: 6617b6ab19dSGarrett Wollman bzero(&w, sizeof(w)); 6627b6ab19dSGarrett Wollman w.w_rtm.rtm_msglen = sizeof(w); 6637b6ab19dSGarrett Wollman w.w_rtm.rtm_version = RTM_VERSION; 6647b6ab19dSGarrett Wollman w.w_rtm.rtm_type = action; 6657b6ab19dSGarrett Wollman w.w_rtm.rtm_flags = flags; 6667b6ab19dSGarrett Wollman w.w_rtm.rtm_seq = ++rt_sock_seqno; 6677b6ab19dSGarrett Wollman w.w_rtm.rtm_addrs = RTA_DST|RTA_GATEWAY; 6687b6ab19dSGarrett Wollman if (metric != 0) { 6697b6ab19dSGarrett Wollman w.w_rtm.rtm_rmx.rmx_hopcount = metric; 6707b6ab19dSGarrett Wollman w.w_rtm.rtm_inits |= RTV_HOPCOUNT; 6717b6ab19dSGarrett Wollman } 6727b6ab19dSGarrett Wollman w.w_dst.sin_family = AF_INET; 6737b6ab19dSGarrett Wollman w.w_dst.sin_addr.s_addr = dst; 6747b6ab19dSGarrett Wollman w.w_gate.sin_family = AF_INET; 6757b6ab19dSGarrett Wollman w.w_gate.sin_addr.s_addr = gate; 6767b6ab19dSGarrett Wollman #ifdef _HAVE_SA_LEN 6777b6ab19dSGarrett Wollman w.w_dst.sin_len = sizeof(w.w_dst); 6787b6ab19dSGarrett Wollman w.w_gate.sin_len = sizeof(w.w_gate); 6797b6ab19dSGarrett Wollman #endif 6807b6ab19dSGarrett Wollman if (mask == HOST_MASK) { 6817b6ab19dSGarrett Wollman w.w_rtm.rtm_flags |= RTF_HOST; 6827b6ab19dSGarrett Wollman w.w_rtm.rtm_msglen -= sizeof(w.w_mask); 6837b6ab19dSGarrett Wollman } else { 6847b6ab19dSGarrett Wollman w.w_rtm.rtm_addrs |= RTA_NETMASK; 6857b6ab19dSGarrett Wollman w.w_mask.sin_addr.s_addr = htonl(mask); 6867b6ab19dSGarrett Wollman #ifdef _HAVE_SA_LEN 6877b6ab19dSGarrett Wollman masktrim(&w.w_mask); 6887b6ab19dSGarrett Wollman w.w_rtm.rtm_msglen -= (sizeof(w.w_mask) - w.w_mask.sin_len); 6897b6ab19dSGarrett Wollman #endif 6907b6ab19dSGarrett Wollman } 6917b6ab19dSGarrett Wollman 6927b6ab19dSGarrett Wollman if (TRACEKERNEL) 6937b6ab19dSGarrett Wollman trace_kernel("write kernel %s %s->%s metric=%d flags=%#x\n", 6947b6ab19dSGarrett Wollman rtm_type_name(action), 6957b6ab19dSGarrett Wollman addrname(dst, mask, 0), naddr_ntoa(gate), 6967b6ab19dSGarrett Wollman metric, flags); 6977b6ab19dSGarrett Wollman 6987b6ab19dSGarrett Wollman #ifndef NO_INSTALL 6997b6ab19dSGarrett Wollman cc = write(rt_sock, &w, w.w_rtm.rtm_msglen); 7007b6ab19dSGarrett Wollman if (cc == w.w_rtm.rtm_msglen) 7017b6ab19dSGarrett Wollman return; 7027b6ab19dSGarrett Wollman if (cc < 0) { 7037b6ab19dSGarrett Wollman if (errno == ESRCH 7047b6ab19dSGarrett Wollman && (action == RTM_CHANGE || action == RTM_DELETE)) { 70552ad6021SGarrett Wollman trace_act("route to %s disappeared before %s", 7067b6ab19dSGarrett Wollman addrname(dst, mask, 0), 7077b6ab19dSGarrett Wollman rtm_type_name(action)); 7087b6ab19dSGarrett Wollman if (action == RTM_CHANGE) { 7097b6ab19dSGarrett Wollman action = RTM_ADD; 7107b6ab19dSGarrett Wollman goto again; 7117b6ab19dSGarrett Wollman } 7127b6ab19dSGarrett Wollman return; 7137b6ab19dSGarrett Wollman } 7147b6ab19dSGarrett Wollman msglog("write(rt_sock) %s %s --> %s: %s", 7157b6ab19dSGarrett Wollman rtm_type_name(action), 7167b6ab19dSGarrett Wollman addrname(dst, mask, 0), naddr_ntoa(gate), 7177b6ab19dSGarrett Wollman strerror(errno)); 7187b6ab19dSGarrett Wollman } else { 7197b6ab19dSGarrett Wollman msglog("write(rt_sock) wrote %d instead of %d", 7207b6ab19dSGarrett Wollman cc, w.w_rtm.rtm_msglen); 7217b6ab19dSGarrett Wollman } 7227b6ab19dSGarrett Wollman #endif 7237b6ab19dSGarrett Wollman } 7247b6ab19dSGarrett Wollman 7257b6ab19dSGarrett Wollman 7267b6ab19dSGarrett Wollman #define KHASH_SIZE 71 /* should be prime */ 7277b6ab19dSGarrett Wollman #define KHASH(a,m) khash_bins[((a) ^ (m)) % KHASH_SIZE] 7287b6ab19dSGarrett Wollman static struct khash { 7297b6ab19dSGarrett Wollman struct khash *k_next; 7307b6ab19dSGarrett Wollman naddr k_dst; 7317b6ab19dSGarrett Wollman naddr k_mask; 7327b6ab19dSGarrett Wollman naddr k_gate; 7337b6ab19dSGarrett Wollman short k_metric; 7347b6ab19dSGarrett Wollman u_short k_state; 7357b6ab19dSGarrett Wollman #define KS_NEW 0x001 7367b6ab19dSGarrett Wollman #define KS_DELETE 0x002 7377b6ab19dSGarrett Wollman #define KS_ADD 0x004 /* add to the kernel */ 7387b6ab19dSGarrett Wollman #define KS_CHANGE 0x008 /* tell kernel to change the route */ 7397b6ab19dSGarrett Wollman #define KS_DEL_ADD 0x010 /* delete & add to change the kernel */ 7407b6ab19dSGarrett Wollman #define KS_STATIC 0x020 /* Static flag in kernel */ 7417b6ab19dSGarrett Wollman #define KS_GATEWAY 0x040 /* G flag in kernel */ 7427b6ab19dSGarrett Wollman #define KS_DYNAMIC 0x080 /* result of redirect */ 7437b6ab19dSGarrett Wollman #define KS_DELETED 0x100 /* already deleted */ 7447b6ab19dSGarrett Wollman time_t k_keep; 7457b6ab19dSGarrett Wollman #define K_KEEP_LIM 30 746a30febecSGarrett Wollman time_t k_redirect_time; /* when redirected route 1st seen */ 7477b6ab19dSGarrett Wollman } *khash_bins[KHASH_SIZE]; 7487b6ab19dSGarrett Wollman 7497b6ab19dSGarrett Wollman 7507b6ab19dSGarrett Wollman static struct khash* 7517b6ab19dSGarrett Wollman kern_find(naddr dst, naddr mask, struct khash ***ppk) 7527b6ab19dSGarrett Wollman { 7537b6ab19dSGarrett Wollman struct khash *k, **pk; 7547b6ab19dSGarrett Wollman 7557b6ab19dSGarrett Wollman for (pk = &KHASH(dst,mask); (k = *pk) != 0; pk = &k->k_next) { 7567b6ab19dSGarrett Wollman if (k->k_dst == dst && k->k_mask == mask) 7577b6ab19dSGarrett Wollman break; 7587b6ab19dSGarrett Wollman } 7597b6ab19dSGarrett Wollman if (ppk != 0) 7607b6ab19dSGarrett Wollman *ppk = pk; 7617b6ab19dSGarrett Wollman return k; 7627b6ab19dSGarrett Wollman } 7637b6ab19dSGarrett Wollman 7647b6ab19dSGarrett Wollman 7657b6ab19dSGarrett Wollman static struct khash* 7667b6ab19dSGarrett Wollman kern_add(naddr dst, naddr mask) 7677b6ab19dSGarrett Wollman { 7687b6ab19dSGarrett Wollman struct khash *k, **pk; 7697b6ab19dSGarrett Wollman 7707b6ab19dSGarrett Wollman k = kern_find(dst, mask, &pk); 7717b6ab19dSGarrett Wollman if (k != 0) 7727b6ab19dSGarrett Wollman return k; 7737b6ab19dSGarrett Wollman 77490100551SPhilippe Charnier k = (struct khash *)rtmalloc(sizeof(*k), "kern_add"); 7757b6ab19dSGarrett Wollman 7767b6ab19dSGarrett Wollman bzero(k, sizeof(*k)); 7777b6ab19dSGarrett Wollman k->k_dst = dst; 7787b6ab19dSGarrett Wollman k->k_mask = mask; 7797b6ab19dSGarrett Wollman k->k_state = KS_NEW; 7807b6ab19dSGarrett Wollman k->k_keep = now.tv_sec; 7817b6ab19dSGarrett Wollman *pk = k; 7827b6ab19dSGarrett Wollman 7837b6ab19dSGarrett Wollman return k; 7847b6ab19dSGarrett Wollman } 7857b6ab19dSGarrett Wollman 7867b6ab19dSGarrett Wollman 7877b6ab19dSGarrett Wollman /* If a kernel route has a non-zero metric, check that it is still in the 7887b6ab19dSGarrett Wollman * daemon table, and not deleted by interfaces coming and going. 7897b6ab19dSGarrett Wollman */ 7907b6ab19dSGarrett Wollman static void 7917b6ab19dSGarrett Wollman kern_check_static(struct khash *k, 7927b6ab19dSGarrett Wollman struct interface *ifp) 7937b6ab19dSGarrett Wollman { 7947b6ab19dSGarrett Wollman struct rt_entry *rt; 7957b6ab19dSGarrett Wollman naddr int_addr; 7967b6ab19dSGarrett Wollman 7977b6ab19dSGarrett Wollman if (k->k_metric == 0) 7987b6ab19dSGarrett Wollman return; 7997b6ab19dSGarrett Wollman 8007b6ab19dSGarrett Wollman int_addr = (ifp != 0) ? ifp->int_addr : loopaddr; 8017b6ab19dSGarrett Wollman 8027b6ab19dSGarrett Wollman rt = rtget(k->k_dst, k->k_mask); 8037b6ab19dSGarrett Wollman if (rt != 0) { 8047b6ab19dSGarrett Wollman if (!(rt->rt_state & RS_STATIC)) 8057b6ab19dSGarrett Wollman rtchange(rt, rt->rt_state | RS_STATIC, 8067b6ab19dSGarrett Wollman k->k_gate, int_addr, 8077b6ab19dSGarrett Wollman k->k_metric, 0, ifp, now.tv_sec, 0); 8087b6ab19dSGarrett Wollman } else { 8097b6ab19dSGarrett Wollman rtadd(k->k_dst, k->k_mask, k->k_gate, int_addr, 8107b6ab19dSGarrett Wollman k->k_metric, 0, RS_STATIC, ifp); 8117b6ab19dSGarrett Wollman } 8127b6ab19dSGarrett Wollman } 8137b6ab19dSGarrett Wollman 8147b6ab19dSGarrett Wollman 8157b6ab19dSGarrett Wollman /* add a route the kernel told us 8167b6ab19dSGarrett Wollman */ 8177b6ab19dSGarrett Wollman static void 8187b6ab19dSGarrett Wollman rtm_add(struct rt_msghdr *rtm, 8197b6ab19dSGarrett Wollman struct rt_addrinfo *info, 8207b6ab19dSGarrett Wollman time_t keep) 8217b6ab19dSGarrett Wollman { 8227b6ab19dSGarrett Wollman struct khash *k; 8237b6ab19dSGarrett Wollman struct interface *ifp; 8247b6ab19dSGarrett Wollman naddr mask; 8257b6ab19dSGarrett Wollman 8267b6ab19dSGarrett Wollman 8277b6ab19dSGarrett Wollman if (rtm->rtm_flags & RTF_HOST) { 8287b6ab19dSGarrett Wollman mask = HOST_MASK; 8297b6ab19dSGarrett Wollman } else if (INFO_MASK(info) != 0) { 8307b6ab19dSGarrett Wollman mask = ntohl(S_ADDR(INFO_MASK(info))); 8317b6ab19dSGarrett Wollman } else { 832a30febecSGarrett Wollman msglog("ignore %s without mask", rtm_type_name(rtm->rtm_type)); 8337b6ab19dSGarrett Wollman return; 8347b6ab19dSGarrett Wollman } 8357b6ab19dSGarrett Wollman 8367b6ab19dSGarrett Wollman if (INFO_GATE(info) == 0 8377b6ab19dSGarrett Wollman || INFO_GATE(info)->sa_family != AF_INET) { 83852ad6021SGarrett Wollman msglog("ignore %s without gateway", 8397b6ab19dSGarrett Wollman rtm_type_name(rtm->rtm_type)); 8407b6ab19dSGarrett Wollman return; 8417b6ab19dSGarrett Wollman } 8427b6ab19dSGarrett Wollman 8437b6ab19dSGarrett Wollman k = kern_add(S_ADDR(INFO_DST(info)), mask); 8447b6ab19dSGarrett Wollman if (k->k_state & KS_NEW) 8457b6ab19dSGarrett Wollman k->k_keep = now.tv_sec+keep; 8467b6ab19dSGarrett Wollman k->k_gate = S_ADDR(INFO_GATE(info)); 8477b6ab19dSGarrett Wollman k->k_metric = rtm->rtm_rmx.rmx_hopcount; 8487b6ab19dSGarrett Wollman if (k->k_metric < 0) 8497b6ab19dSGarrett Wollman k->k_metric = 0; 8507b6ab19dSGarrett Wollman else if (k->k_metric > HOPCNT_INFINITY) 8517b6ab19dSGarrett Wollman k->k_metric = HOPCNT_INFINITY; 8527b6ab19dSGarrett Wollman k->k_state &= ~(KS_DELETED | KS_GATEWAY | KS_STATIC | KS_NEW); 8537b6ab19dSGarrett Wollman if (rtm->rtm_flags & RTF_GATEWAY) 8547b6ab19dSGarrett Wollman k->k_state |= KS_GATEWAY; 8557b6ab19dSGarrett Wollman if (rtm->rtm_flags & RTF_STATIC) 8567b6ab19dSGarrett Wollman k->k_state |= KS_STATIC; 8577b6ab19dSGarrett Wollman 8587b6ab19dSGarrett Wollman if (0 != (rtm->rtm_flags & (RTF_DYNAMIC | RTF_MODIFIED))) { 859a30febecSGarrett Wollman if (INFO_AUTHOR(info) != 0 860a30febecSGarrett Wollman && INFO_AUTHOR(info)->sa_family == AF_INET) 861a30febecSGarrett Wollman ifp = iflookup(S_ADDR(INFO_AUTHOR(info))); 862a30febecSGarrett Wollman else 863a30febecSGarrett Wollman ifp = 0; 864a30febecSGarrett Wollman if (supplier 865a30febecSGarrett Wollman && (ifp == 0 || !(ifp->int_state & IS_REDIRECT_OK))) { 8667b6ab19dSGarrett Wollman /* Routers are not supposed to listen to redirects, 867a30febecSGarrett Wollman * so delete it if it came via an unknown interface 868a30febecSGarrett Wollman * or the interface does not have special permission. 8697b6ab19dSGarrett Wollman */ 8707b6ab19dSGarrett Wollman k->k_state &= ~KS_DYNAMIC; 8717b6ab19dSGarrett Wollman k->k_state |= KS_DELETE; 8727b6ab19dSGarrett Wollman LIM_SEC(need_kern, 0); 873a30febecSGarrett Wollman trace_act("mark for deletion redirected %s --> %s" 874a30febecSGarrett Wollman " via %s", 8757b6ab19dSGarrett Wollman addrname(k->k_dst, k->k_mask, 0), 876a30febecSGarrett Wollman naddr_ntoa(k->k_gate), 877a30febecSGarrett Wollman ifp ? ifp->int_name : "unknown interface"); 8787b6ab19dSGarrett Wollman } else { 8797b6ab19dSGarrett Wollman k->k_state |= KS_DYNAMIC; 8807b6ab19dSGarrett Wollman k->k_redirect_time = now.tv_sec; 881a30febecSGarrett Wollman trace_act("accept redirected %s --> %s via %s", 882a30febecSGarrett Wollman addrname(k->k_dst, k->k_mask, 0), 883a30febecSGarrett Wollman naddr_ntoa(k->k_gate), 884a30febecSGarrett Wollman ifp ? ifp->int_name : "unknown interface"); 8857b6ab19dSGarrett Wollman } 8867b6ab19dSGarrett Wollman return; 8877b6ab19dSGarrett Wollman } 8887b6ab19dSGarrett Wollman 8897b6ab19dSGarrett Wollman /* If it is not a static route, quit until the next comparison 8907b6ab19dSGarrett Wollman * between the kernel and daemon tables, when it will be deleted. 8917b6ab19dSGarrett Wollman */ 8927b6ab19dSGarrett Wollman if (!(k->k_state & KS_STATIC)) { 8937b6ab19dSGarrett Wollman k->k_state |= KS_DELETE; 8947b6ab19dSGarrett Wollman LIM_SEC(need_kern, k->k_keep); 8957b6ab19dSGarrett Wollman return; 8967b6ab19dSGarrett Wollman } 8977b6ab19dSGarrett Wollman 8987b6ab19dSGarrett Wollman /* Put static routes with real metrics into the daemon table so 8997b6ab19dSGarrett Wollman * they can be advertised. 9007b6ab19dSGarrett Wollman * 90152ad6021SGarrett Wollman * Find the interface toward the gateway. 9027b6ab19dSGarrett Wollman */ 9037b6ab19dSGarrett Wollman ifp = iflookup(k->k_gate); 9047b6ab19dSGarrett Wollman if (ifp == 0) 9057b6ab19dSGarrett Wollman msglog("static route %s --> %s impossibly lacks ifp", 9067b6ab19dSGarrett Wollman addrname(S_ADDR(INFO_DST(info)), mask, 0), 9077b6ab19dSGarrett Wollman naddr_ntoa(k->k_gate)); 9087b6ab19dSGarrett Wollman 9097b6ab19dSGarrett Wollman kern_check_static(k, ifp); 9107b6ab19dSGarrett Wollman } 9117b6ab19dSGarrett Wollman 9127b6ab19dSGarrett Wollman 9137b6ab19dSGarrett Wollman /* deal with packet loss 9147b6ab19dSGarrett Wollman */ 9157b6ab19dSGarrett Wollman static void 9167b6ab19dSGarrett Wollman rtm_lose(struct rt_msghdr *rtm, 9177b6ab19dSGarrett Wollman struct rt_addrinfo *info) 9187b6ab19dSGarrett Wollman { 9197b6ab19dSGarrett Wollman if (INFO_GATE(info) == 0 9207b6ab19dSGarrett Wollman || INFO_GATE(info)->sa_family != AF_INET) { 921a30febecSGarrett Wollman trace_act("ignore %s without gateway", 9227b6ab19dSGarrett Wollman rtm_type_name(rtm->rtm_type)); 9237b6ab19dSGarrett Wollman return; 9247b6ab19dSGarrett Wollman } 9257b6ab19dSGarrett Wollman 9267b6ab19dSGarrett Wollman if (!supplier) 9277b6ab19dSGarrett Wollman rdisc_age(S_ADDR(INFO_GATE(info))); 9287b6ab19dSGarrett Wollman 9297b6ab19dSGarrett Wollman age(S_ADDR(INFO_GATE(info))); 9307b6ab19dSGarrett Wollman } 9317b6ab19dSGarrett Wollman 9327b6ab19dSGarrett Wollman 9337b6ab19dSGarrett Wollman /* Clean the kernel table by copying it to the daemon image. 9347b6ab19dSGarrett Wollman * Eventually the daemon will delete any extra routes. 9357b6ab19dSGarrett Wollman */ 9367b6ab19dSGarrett Wollman void 9377b6ab19dSGarrett Wollman flush_kern(void) 9387b6ab19dSGarrett Wollman { 9397b6ab19dSGarrett Wollman size_t needed; 9407b6ab19dSGarrett Wollman int mib[6]; 9417b6ab19dSGarrett Wollman char *buf, *next, *lim; 9427b6ab19dSGarrett Wollman struct rt_msghdr *rtm; 9437b6ab19dSGarrett Wollman struct interface *ifp; 9447b6ab19dSGarrett Wollman static struct sockaddr_in gate_sa; 9457b6ab19dSGarrett Wollman struct rt_addrinfo info; 9467b6ab19dSGarrett Wollman 9477b6ab19dSGarrett Wollman 9487b6ab19dSGarrett Wollman mib[0] = CTL_NET; 9497b6ab19dSGarrett Wollman mib[1] = PF_ROUTE; 9507b6ab19dSGarrett Wollman mib[2] = 0; /* protocol */ 9517b6ab19dSGarrett Wollman mib[3] = 0; /* wildcard address family */ 9527b6ab19dSGarrett Wollman mib[4] = NET_RT_DUMP; 9537b6ab19dSGarrett Wollman mib[5] = 0; /* no flags */ 9547b6ab19dSGarrett Wollman if (sysctl(mib, 6, 0, &needed, 0, 0) < 0) { 9557b6ab19dSGarrett Wollman DBGERR(1,"RT_DUMP-sysctl-estimate"); 9567b6ab19dSGarrett Wollman return; 9577b6ab19dSGarrett Wollman } 95890100551SPhilippe Charnier buf = (char *)rtmalloc(needed, "flush_kern"); 9597b6ab19dSGarrett Wollman if (sysctl(mib, 6, buf, &needed, 0, 0) < 0) 9607b6ab19dSGarrett Wollman BADERR(1,"RT_DUMP"); 9617b6ab19dSGarrett Wollman lim = buf + needed; 9627b6ab19dSGarrett Wollman for (next = buf; next < lim; next += rtm->rtm_msglen) { 9637b6ab19dSGarrett Wollman rtm = (struct rt_msghdr *)next; 9647b6ab19dSGarrett Wollman 9657b6ab19dSGarrett Wollman rt_xaddrs(&info, 9667b6ab19dSGarrett Wollman (struct sockaddr *)(rtm+1), 9677b6ab19dSGarrett Wollman (struct sockaddr *)(next + rtm->rtm_msglen), 9687b6ab19dSGarrett Wollman rtm->rtm_addrs); 9697b6ab19dSGarrett Wollman 9707b6ab19dSGarrett Wollman if (INFO_DST(&info) == 0 9717b6ab19dSGarrett Wollman || INFO_DST(&info)->sa_family != AF_INET) 9727b6ab19dSGarrett Wollman continue; 9737b6ab19dSGarrett Wollman 9747b6ab19dSGarrett Wollman /* ignore ARP table entries on systems with a merged route 9757b6ab19dSGarrett Wollman * and ARP table. 9767b6ab19dSGarrett Wollman */ 9777b6ab19dSGarrett Wollman if (rtm->rtm_flags & RTF_LLINFO) 9787b6ab19dSGarrett Wollman continue; 9797b6ab19dSGarrett Wollman 9807b6ab19dSGarrett Wollman if (INFO_GATE(&info) == 0) 9817b6ab19dSGarrett Wollman continue; 9827b6ab19dSGarrett Wollman if (INFO_GATE(&info)->sa_family != AF_INET) { 9837b6ab19dSGarrett Wollman if (INFO_GATE(&info)->sa_family != AF_LINK) 9847b6ab19dSGarrett Wollman continue; 9857b6ab19dSGarrett Wollman ifp = ifwithindex(((struct sockaddr_dl *) 9867b6ab19dSGarrett Wollman INFO_GATE(&info))->sdl_index); 9877b6ab19dSGarrett Wollman if (ifp == 0) 9887b6ab19dSGarrett Wollman continue; 9897b6ab19dSGarrett Wollman if ((ifp->int_if_flags & IFF_POINTOPOINT) 9907b6ab19dSGarrett Wollman || S_ADDR(INFO_DST(&info)) == ifp->int_addr) 9917b6ab19dSGarrett Wollman gate_sa.sin_addr.s_addr = ifp->int_addr; 9927b6ab19dSGarrett Wollman else 9937b6ab19dSGarrett Wollman gate_sa.sin_addr.s_addr = htonl(ifp->int_net); 9947b6ab19dSGarrett Wollman #ifdef _HAVE_SA_LEN 9957b6ab19dSGarrett Wollman gate_sa.sin_len = sizeof(gate_sa); 9967b6ab19dSGarrett Wollman #endif 9977b6ab19dSGarrett Wollman gate_sa.sin_family = AF_INET; 9987b6ab19dSGarrett Wollman INFO_GATE(&info) = (struct sockaddr *)&gate_sa; 9997b6ab19dSGarrett Wollman } 10007b6ab19dSGarrett Wollman 10017b6ab19dSGarrett Wollman /* ignore multicast addresses 10027b6ab19dSGarrett Wollman */ 10037b6ab19dSGarrett Wollman if (IN_MULTICAST(ntohl(S_ADDR(INFO_DST(&info))))) 10047b6ab19dSGarrett Wollman continue; 10057b6ab19dSGarrett Wollman 10067b6ab19dSGarrett Wollman /* Note static routes and interface routes, and also 10077b6ab19dSGarrett Wollman * preload the image of the kernel table so that 10087b6ab19dSGarrett Wollman * we can later clean it, as well as avoid making 10097b6ab19dSGarrett Wollman * unneeded changes. Keep the old kernel routes for a 10107b6ab19dSGarrett Wollman * few seconds to allow a RIP or router-discovery 10117b6ab19dSGarrett Wollman * response to be heard. 10127b6ab19dSGarrett Wollman */ 10137b6ab19dSGarrett Wollman rtm_add(rtm,&info,MIN_WAITTIME); 10147b6ab19dSGarrett Wollman } 10157b6ab19dSGarrett Wollman free(buf); 10167b6ab19dSGarrett Wollman } 10177b6ab19dSGarrett Wollman 10187b6ab19dSGarrett Wollman 10197b6ab19dSGarrett Wollman /* Listen to announcements from the kernel 10207b6ab19dSGarrett Wollman */ 10217b6ab19dSGarrett Wollman void 10227b6ab19dSGarrett Wollman read_rt(void) 10237b6ab19dSGarrett Wollman { 10247b6ab19dSGarrett Wollman long cc; 10257b6ab19dSGarrett Wollman struct interface *ifp; 10267b6ab19dSGarrett Wollman naddr mask; 10277b6ab19dSGarrett Wollman union { 10287b6ab19dSGarrett Wollman struct { 10297b6ab19dSGarrett Wollman struct rt_msghdr rtm; 10307b6ab19dSGarrett Wollman struct sockaddr addrs[RTAX_MAX]; 10317b6ab19dSGarrett Wollman } r; 10327b6ab19dSGarrett Wollman struct if_msghdr ifm; 10337b6ab19dSGarrett Wollman } m; 10347b6ab19dSGarrett Wollman char str[100], *strp; 10357b6ab19dSGarrett Wollman struct rt_addrinfo info; 10367b6ab19dSGarrett Wollman 10377b6ab19dSGarrett Wollman 10387b6ab19dSGarrett Wollman for (;;) { 10397b6ab19dSGarrett Wollman cc = read(rt_sock, &m, sizeof(m)); 10407b6ab19dSGarrett Wollman if (cc <= 0) { 10417b6ab19dSGarrett Wollman if (cc < 0 && errno != EWOULDBLOCK) 10427b6ab19dSGarrett Wollman LOGERR("read(rt_sock)"); 10437b6ab19dSGarrett Wollman return; 10447b6ab19dSGarrett Wollman } 10457b6ab19dSGarrett Wollman 10467b6ab19dSGarrett Wollman if (m.r.rtm.rtm_version != RTM_VERSION) { 10477b6ab19dSGarrett Wollman msglog("bogus routing message version %d", 10487b6ab19dSGarrett Wollman m.r.rtm.rtm_version); 10497b6ab19dSGarrett Wollman continue; 10507b6ab19dSGarrett Wollman } 10517b6ab19dSGarrett Wollman 10527b6ab19dSGarrett Wollman /* Ignore our own results. 10537b6ab19dSGarrett Wollman */ 10547b6ab19dSGarrett Wollman if (m.r.rtm.rtm_type <= RTM_CHANGE 10557b6ab19dSGarrett Wollman && m.r.rtm.rtm_pid == mypid) { 10567b6ab19dSGarrett Wollman static int complained = 0; 10577b6ab19dSGarrett Wollman if (!complained) { 10587b6ab19dSGarrett Wollman msglog("receiving our own change messages"); 10597b6ab19dSGarrett Wollman complained = 1; 10607b6ab19dSGarrett Wollman } 10617b6ab19dSGarrett Wollman continue; 10627b6ab19dSGarrett Wollman } 10637b6ab19dSGarrett Wollman 10647b6ab19dSGarrett Wollman if (m.r.rtm.rtm_type == RTM_IFINFO 10657b6ab19dSGarrett Wollman || m.r.rtm.rtm_type == RTM_NEWADDR 10667b6ab19dSGarrett Wollman || m.r.rtm.rtm_type == RTM_DELADDR) { 10677b6ab19dSGarrett Wollman ifp = ifwithindex(m.ifm.ifm_index); 10687b6ab19dSGarrett Wollman if (ifp == 0) 10697b6ab19dSGarrett Wollman trace_act("note %s with flags %#x" 107052ad6021SGarrett Wollman " for index #%d", 10717b6ab19dSGarrett Wollman rtm_type_name(m.r.rtm.rtm_type), 10727b6ab19dSGarrett Wollman m.ifm.ifm_flags, 10737b6ab19dSGarrett Wollman m.ifm.ifm_index); 10747b6ab19dSGarrett Wollman else 107552ad6021SGarrett Wollman trace_act("note %s with flags %#x for %s", 10767b6ab19dSGarrett Wollman rtm_type_name(m.r.rtm.rtm_type), 10777b6ab19dSGarrett Wollman m.ifm.ifm_flags, 10787b6ab19dSGarrett Wollman ifp->int_name); 10797b6ab19dSGarrett Wollman 10807b6ab19dSGarrett Wollman /* After being informed of a change to an interface, 10817b6ab19dSGarrett Wollman * check them all now if the check would otherwise 10827b6ab19dSGarrett Wollman * be a long time from now, if the interface is 10837b6ab19dSGarrett Wollman * not known, or if the interface has been turned 10847b6ab19dSGarrett Wollman * off or on. 10857b6ab19dSGarrett Wollman */ 10867b6ab19dSGarrett Wollman if (ifinit_timer.tv_sec-now.tv_sec>=CHECK_BAD_INTERVAL 10877b6ab19dSGarrett Wollman || ifp == 0 10887b6ab19dSGarrett Wollman || ((ifp->int_if_flags ^ m.ifm.ifm_flags) 10897b6ab19dSGarrett Wollman & IFF_UP_RUNNING) != 0) 10907b6ab19dSGarrett Wollman ifinit_timer.tv_sec = now.tv_sec; 10917b6ab19dSGarrett Wollman continue; 10927b6ab19dSGarrett Wollman } 10937b6ab19dSGarrett Wollman 10947b6ab19dSGarrett Wollman strcpy(str, rtm_type_name(m.r.rtm.rtm_type)); 10957b6ab19dSGarrett Wollman strp = &str[strlen(str)]; 10967b6ab19dSGarrett Wollman if (m.r.rtm.rtm_type <= RTM_CHANGE) 10977b6ab19dSGarrett Wollman strp += sprintf(strp," from pid %d",m.r.rtm.rtm_pid); 10987b6ab19dSGarrett Wollman 10997b6ab19dSGarrett Wollman rt_xaddrs(&info, m.r.addrs, &m.r.addrs[RTAX_MAX], 11007b6ab19dSGarrett Wollman m.r.rtm.rtm_addrs); 11017b6ab19dSGarrett Wollman 11027b6ab19dSGarrett Wollman if (INFO_DST(&info) == 0) { 110352ad6021SGarrett Wollman trace_act("ignore %s without dst", str); 11047b6ab19dSGarrett Wollman continue; 11057b6ab19dSGarrett Wollman } 11067b6ab19dSGarrett Wollman 11077b6ab19dSGarrett Wollman if (INFO_DST(&info)->sa_family != AF_INET) { 110852ad6021SGarrett Wollman trace_act("ignore %s for AF %d", str, 11097b6ab19dSGarrett Wollman INFO_DST(&info)->sa_family); 11107b6ab19dSGarrett Wollman continue; 11117b6ab19dSGarrett Wollman } 11127b6ab19dSGarrett Wollman 11137b6ab19dSGarrett Wollman mask = ((INFO_MASK(&info) != 0) 11147b6ab19dSGarrett Wollman ? ntohl(S_ADDR(INFO_MASK(&info))) 11157b6ab19dSGarrett Wollman : (m.r.rtm.rtm_flags & RTF_HOST) 11167b6ab19dSGarrett Wollman ? HOST_MASK 11177b6ab19dSGarrett Wollman : std_mask(S_ADDR(INFO_DST(&info)))); 11187b6ab19dSGarrett Wollman 11197b6ab19dSGarrett Wollman strp += sprintf(strp, ": %s", 11207b6ab19dSGarrett Wollman addrname(S_ADDR(INFO_DST(&info)), mask, 0)); 11217b6ab19dSGarrett Wollman 11227b6ab19dSGarrett Wollman if (IN_MULTICAST(ntohl(S_ADDR(INFO_DST(&info))))) { 112352ad6021SGarrett Wollman trace_act("ignore multicast %s", str); 11247b6ab19dSGarrett Wollman continue; 11257b6ab19dSGarrett Wollman } 11267b6ab19dSGarrett Wollman 11277b6ab19dSGarrett Wollman if (INFO_GATE(&info) != 0 11287b6ab19dSGarrett Wollman && INFO_GATE(&info)->sa_family == AF_INET) 11297b6ab19dSGarrett Wollman strp += sprintf(strp, " --> %s", 11307b6ab19dSGarrett Wollman saddr_ntoa(INFO_GATE(&info))); 11317b6ab19dSGarrett Wollman 11327b6ab19dSGarrett Wollman if (INFO_AUTHOR(&info) != 0) 11337b6ab19dSGarrett Wollman strp += sprintf(strp, " by authority of %s", 11347b6ab19dSGarrett Wollman saddr_ntoa(INFO_AUTHOR(&info))); 11357b6ab19dSGarrett Wollman 11367b6ab19dSGarrett Wollman switch (m.r.rtm.rtm_type) { 11377b6ab19dSGarrett Wollman case RTM_ADD: 11387b6ab19dSGarrett Wollman case RTM_CHANGE: 11397b6ab19dSGarrett Wollman case RTM_REDIRECT: 11407b6ab19dSGarrett Wollman if (m.r.rtm.rtm_errno != 0) { 114152ad6021SGarrett Wollman trace_act("ignore %s with \"%s\" error", 11427b6ab19dSGarrett Wollman str, strerror(m.r.rtm.rtm_errno)); 11437b6ab19dSGarrett Wollman } else { 114452ad6021SGarrett Wollman trace_act("%s", str); 11457b6ab19dSGarrett Wollman rtm_add(&m.r.rtm,&info,0); 11467b6ab19dSGarrett Wollman } 11477b6ab19dSGarrett Wollman break; 11487b6ab19dSGarrett Wollman 11497b6ab19dSGarrett Wollman case RTM_DELETE: 11507b6ab19dSGarrett Wollman if (m.r.rtm.rtm_errno != 0) { 115152ad6021SGarrett Wollman trace_act("ignore %s with \"%s\" error", 11527b6ab19dSGarrett Wollman str, strerror(m.r.rtm.rtm_errno)); 11537b6ab19dSGarrett Wollman } else { 115452ad6021SGarrett Wollman trace_act("%s", str); 11557b6ab19dSGarrett Wollman del_static(S_ADDR(INFO_DST(&info)), mask, 1); 11567b6ab19dSGarrett Wollman } 11577b6ab19dSGarrett Wollman break; 11587b6ab19dSGarrett Wollman 11597b6ab19dSGarrett Wollman case RTM_LOSING: 116052ad6021SGarrett Wollman trace_act("%s", str); 11617b6ab19dSGarrett Wollman rtm_lose(&m.r.rtm,&info); 11627b6ab19dSGarrett Wollman break; 11637b6ab19dSGarrett Wollman 11647b6ab19dSGarrett Wollman default: 116552ad6021SGarrett Wollman trace_act("ignore %s", str); 11667b6ab19dSGarrett Wollman break; 11677b6ab19dSGarrett Wollman } 11687b6ab19dSGarrett Wollman } 11697b6ab19dSGarrett Wollman } 11707b6ab19dSGarrett Wollman 11717b6ab19dSGarrett Wollman 11727b6ab19dSGarrett Wollman /* after aggregating, note routes that belong in the kernel 11737b6ab19dSGarrett Wollman */ 11747b6ab19dSGarrett Wollman static void 11757b6ab19dSGarrett Wollman kern_out(struct ag_info *ag) 11767b6ab19dSGarrett Wollman { 11777b6ab19dSGarrett Wollman struct khash *k; 11787b6ab19dSGarrett Wollman 11797b6ab19dSGarrett Wollman 11807b6ab19dSGarrett Wollman /* Do not install bad routes if they are not already present. 11817b6ab19dSGarrett Wollman * This includes routes that had RS_NET_SYN for interfaces that 11827b6ab19dSGarrett Wollman * recently died. 11837b6ab19dSGarrett Wollman */ 11847b6ab19dSGarrett Wollman if (ag->ag_metric == HOPCNT_INFINITY) { 11857b6ab19dSGarrett Wollman k = kern_find(htonl(ag->ag_dst_h), ag->ag_mask, 0); 11867b6ab19dSGarrett Wollman if (k == 0) 11877b6ab19dSGarrett Wollman return; 11887b6ab19dSGarrett Wollman } else { 11897b6ab19dSGarrett Wollman k = kern_add(htonl(ag->ag_dst_h), ag->ag_mask); 11907b6ab19dSGarrett Wollman } 11917b6ab19dSGarrett Wollman 11927b6ab19dSGarrett Wollman if (k->k_state & KS_NEW) { 11937b6ab19dSGarrett Wollman /* will need to add new entry to the kernel table */ 11947b6ab19dSGarrett Wollman k->k_state = KS_ADD; 11957b6ab19dSGarrett Wollman if (ag->ag_state & AGS_GATEWAY) 11967b6ab19dSGarrett Wollman k->k_state |= KS_GATEWAY; 11977b6ab19dSGarrett Wollman k->k_gate = ag->ag_gate; 11987b6ab19dSGarrett Wollman k->k_metric = ag->ag_metric; 11997b6ab19dSGarrett Wollman return; 12007b6ab19dSGarrett Wollman } 12017b6ab19dSGarrett Wollman 12027b6ab19dSGarrett Wollman if (k->k_state & KS_STATIC) 12037b6ab19dSGarrett Wollman return; 12047b6ab19dSGarrett Wollman 12057b6ab19dSGarrett Wollman /* modify existing kernel entry if necessary */ 12067b6ab19dSGarrett Wollman if (k->k_gate != ag->ag_gate 12077b6ab19dSGarrett Wollman || k->k_metric != ag->ag_metric) { 12087b6ab19dSGarrett Wollman k->k_gate = ag->ag_gate; 12097b6ab19dSGarrett Wollman k->k_metric = ag->ag_metric; 12107b6ab19dSGarrett Wollman k->k_state |= KS_CHANGE; 12117b6ab19dSGarrett Wollman } 12127b6ab19dSGarrett Wollman 12137b6ab19dSGarrett Wollman if (k->k_state & KS_DYNAMIC) { 12147b6ab19dSGarrett Wollman k->k_state &= ~KS_DYNAMIC; 12157b6ab19dSGarrett Wollman k->k_state |= (KS_ADD | KS_DEL_ADD); 12167b6ab19dSGarrett Wollman } 12177b6ab19dSGarrett Wollman 12187b6ab19dSGarrett Wollman if ((k->k_state & KS_GATEWAY) 12197b6ab19dSGarrett Wollman && !(ag->ag_state & AGS_GATEWAY)) { 12207b6ab19dSGarrett Wollman k->k_state &= ~KS_GATEWAY; 12217b6ab19dSGarrett Wollman k->k_state |= (KS_ADD | KS_DEL_ADD); 12227b6ab19dSGarrett Wollman } else if (!(k->k_state & KS_GATEWAY) 12237b6ab19dSGarrett Wollman && (ag->ag_state & AGS_GATEWAY)) { 12247b6ab19dSGarrett Wollman k->k_state |= KS_GATEWAY; 12257b6ab19dSGarrett Wollman k->k_state |= (KS_ADD | KS_DEL_ADD); 12267b6ab19dSGarrett Wollman } 12277b6ab19dSGarrett Wollman 12287b6ab19dSGarrett Wollman /* Deleting-and-adding is necessary to change aspects of a route. 12297b6ab19dSGarrett Wollman * Just delete instead of deleting and then adding a bad route. 12307b6ab19dSGarrett Wollman * Otherwise, we want to keep the route in the kernel. 12317b6ab19dSGarrett Wollman */ 12327b6ab19dSGarrett Wollman if (k->k_metric == HOPCNT_INFINITY 12337b6ab19dSGarrett Wollman && (k->k_state & KS_DEL_ADD)) 12347b6ab19dSGarrett Wollman k->k_state |= KS_DELETE; 12357b6ab19dSGarrett Wollman else 12367b6ab19dSGarrett Wollman k->k_state &= ~KS_DELETE; 12377b6ab19dSGarrett Wollman #undef RT 12387b6ab19dSGarrett Wollman } 12397b6ab19dSGarrett Wollman 12407b6ab19dSGarrett Wollman 12417b6ab19dSGarrett Wollman /* ARGSUSED */ 12427b6ab19dSGarrett Wollman static int 12437b6ab19dSGarrett Wollman walk_kern(struct radix_node *rn, 12447b6ab19dSGarrett Wollman struct walkarg *w) 12457b6ab19dSGarrett Wollman { 12467b6ab19dSGarrett Wollman #define RT ((struct rt_entry *)rn) 12477b6ab19dSGarrett Wollman char metric, pref; 12487b6ab19dSGarrett Wollman u_int ags = 0; 12497b6ab19dSGarrett Wollman 12507b6ab19dSGarrett Wollman 12517b6ab19dSGarrett Wollman /* Do not install synthetic routes */ 12527b6ab19dSGarrett Wollman if (RT->rt_state & RS_NET_SYN) 12537b6ab19dSGarrett Wollman return 0; 12547b6ab19dSGarrett Wollman 12557b6ab19dSGarrett Wollman if (!(RT->rt_state & RS_IF)) { 12567b6ab19dSGarrett Wollman ags |= (AGS_GATEWAY | AGS_SUPPRESS | AGS_PROMOTE); 12577b6ab19dSGarrett Wollman 12587b6ab19dSGarrett Wollman } else { 12597b6ab19dSGarrett Wollman /* Do not install routes for "external" remote interfaces. 12607b6ab19dSGarrett Wollman */ 12617b6ab19dSGarrett Wollman if (RT->rt_ifp != 0 && (RT->rt_ifp->int_state & IS_EXTERNAL)) 12627b6ab19dSGarrett Wollman return 0; 12637b6ab19dSGarrett Wollman 12647b6ab19dSGarrett Wollman ags |= AGS_IF; 12657b6ab19dSGarrett Wollman 12667b6ab19dSGarrett Wollman /* If it is not an interface, or an alias for an interface, 12677b6ab19dSGarrett Wollman * it must be a "gateway." 12687b6ab19dSGarrett Wollman * 12697b6ab19dSGarrett Wollman * If it is a "remote" interface, it is also a "gateway" to 12707b6ab19dSGarrett Wollman * the kernel if is not a alias. 12717b6ab19dSGarrett Wollman */ 12727b6ab19dSGarrett Wollman if (RT->rt_ifp == 0 127352ad6021SGarrett Wollman || (RT->rt_ifp->int_state & IS_REMOTE)) 12747b6ab19dSGarrett Wollman ags |= (AGS_GATEWAY | AGS_SUPPRESS | AGS_PROMOTE); 12757b6ab19dSGarrett Wollman } 12767b6ab19dSGarrett Wollman 12777b6ab19dSGarrett Wollman if (RT->rt_state & RS_RDISC) 12787b6ab19dSGarrett Wollman ags |= AGS_CORS_GATE; 12797b6ab19dSGarrett Wollman 12807b6ab19dSGarrett Wollman /* aggregate good routes without regard to their metric */ 12817b6ab19dSGarrett Wollman pref = 1; 12827b6ab19dSGarrett Wollman metric = RT->rt_metric; 12837b6ab19dSGarrett Wollman if (metric == HOPCNT_INFINITY) { 12847b6ab19dSGarrett Wollman /* if the route is dead, so try hard to aggregate. */ 12857b6ab19dSGarrett Wollman pref = HOPCNT_INFINITY; 12867b6ab19dSGarrett Wollman ags |= (AGS_FINE_GATE | AGS_SUPPRESS); 12877b6ab19dSGarrett Wollman } 12887b6ab19dSGarrett Wollman 12897b6ab19dSGarrett Wollman ag_check(RT->rt_dst, RT->rt_mask, RT->rt_gate, 0, 12907b6ab19dSGarrett Wollman metric,pref, 0, 0, ags, kern_out); 12917b6ab19dSGarrett Wollman return 0; 12927b6ab19dSGarrett Wollman #undef RT 12937b6ab19dSGarrett Wollman } 12947b6ab19dSGarrett Wollman 12957b6ab19dSGarrett Wollman 12967b6ab19dSGarrett Wollman /* Update the kernel table to match the daemon table. 12977b6ab19dSGarrett Wollman */ 12987b6ab19dSGarrett Wollman static void 12997b6ab19dSGarrett Wollman fix_kern(void) 13007b6ab19dSGarrett Wollman { 13017b6ab19dSGarrett Wollman int i, flags; 13027b6ab19dSGarrett Wollman struct khash *k, **pk; 13037b6ab19dSGarrett Wollman 13047b6ab19dSGarrett Wollman 13057b6ab19dSGarrett Wollman need_kern = age_timer; 13067b6ab19dSGarrett Wollman 13077b6ab19dSGarrett Wollman /* Walk daemon table, updating the copy of the kernel table. 13087b6ab19dSGarrett Wollman */ 13097b6ab19dSGarrett Wollman (void)rn_walktree(rhead, walk_kern, 0); 13107b6ab19dSGarrett Wollman ag_flush(0,0,kern_out); 13117b6ab19dSGarrett Wollman 13127b6ab19dSGarrett Wollman for (i = 0; i < KHASH_SIZE; i++) { 13137b6ab19dSGarrett Wollman for (pk = &khash_bins[i]; (k = *pk) != 0; ) { 13147b6ab19dSGarrett Wollman /* Do not touch static routes */ 13157b6ab19dSGarrett Wollman if (k->k_state & KS_STATIC) { 13167b6ab19dSGarrett Wollman kern_check_static(k,0); 13177b6ab19dSGarrett Wollman pk = &k->k_next; 13187b6ab19dSGarrett Wollman continue; 13197b6ab19dSGarrett Wollman } 13207b6ab19dSGarrett Wollman 13217b6ab19dSGarrett Wollman /* check hold on routes deleted by the operator */ 13227b6ab19dSGarrett Wollman if (k->k_keep > now.tv_sec) { 13237b6ab19dSGarrett Wollman LIM_SEC(need_kern, k->k_keep); 13247b6ab19dSGarrett Wollman k->k_state |= KS_DELETE; 13257b6ab19dSGarrett Wollman pk = &k->k_next; 13267b6ab19dSGarrett Wollman continue; 13277b6ab19dSGarrett Wollman } 13287b6ab19dSGarrett Wollman 13297b6ab19dSGarrett Wollman if ((k->k_state & (KS_DELETE | KS_DYNAMIC)) 13307b6ab19dSGarrett Wollman == KS_DELETE) { 13317b6ab19dSGarrett Wollman if (!(k->k_state & KS_DELETED)) 13327b6ab19dSGarrett Wollman rtioctl(RTM_DELETE, 13337b6ab19dSGarrett Wollman k->k_dst, k->k_gate, k->k_mask, 13347b6ab19dSGarrett Wollman 0, 0); 13357b6ab19dSGarrett Wollman *pk = k->k_next; 13367b6ab19dSGarrett Wollman free(k); 13377b6ab19dSGarrett Wollman continue; 13387b6ab19dSGarrett Wollman } 13397b6ab19dSGarrett Wollman 13407b6ab19dSGarrett Wollman if (0 != (k->k_state&(KS_ADD|KS_CHANGE|KS_DEL_ADD))) { 13417b6ab19dSGarrett Wollman if (k->k_state & KS_DEL_ADD) { 13427b6ab19dSGarrett Wollman rtioctl(RTM_DELETE, 13437b6ab19dSGarrett Wollman k->k_dst,k->k_gate,k->k_mask, 13447b6ab19dSGarrett Wollman 0, 0); 13457b6ab19dSGarrett Wollman k->k_state &= ~KS_DYNAMIC; 13467b6ab19dSGarrett Wollman } 13477b6ab19dSGarrett Wollman 13487b6ab19dSGarrett Wollman flags = 0; 13497b6ab19dSGarrett Wollman if (0 != (k->k_state&(KS_GATEWAY|KS_DYNAMIC))) 13507b6ab19dSGarrett Wollman flags |= RTF_GATEWAY; 13517b6ab19dSGarrett Wollman 13527b6ab19dSGarrett Wollman if (k->k_state & KS_ADD) { 13537b6ab19dSGarrett Wollman rtioctl(RTM_ADD, 13547b6ab19dSGarrett Wollman k->k_dst, k->k_gate, k->k_mask, 13557b6ab19dSGarrett Wollman k->k_metric, flags); 13567b6ab19dSGarrett Wollman } else if (k->k_state & KS_CHANGE) { 13577b6ab19dSGarrett Wollman rtioctl(RTM_CHANGE, 13587b6ab19dSGarrett Wollman k->k_dst,k->k_gate,k->k_mask, 13597b6ab19dSGarrett Wollman k->k_metric, flags); 13607b6ab19dSGarrett Wollman } 13617b6ab19dSGarrett Wollman k->k_state &= ~(KS_ADD|KS_CHANGE|KS_DEL_ADD); 13627b6ab19dSGarrett Wollman } 13637b6ab19dSGarrett Wollman 13647b6ab19dSGarrett Wollman /* Mark this route to be deleted in the next cycle. 13657b6ab19dSGarrett Wollman * This deletes routes that disappear from the 13667b6ab19dSGarrett Wollman * daemon table, since the normal aging code 13677b6ab19dSGarrett Wollman * will clear the bit for routes that have not 13687b6ab19dSGarrett Wollman * disappeared from the daemon table. 13697b6ab19dSGarrett Wollman */ 13707b6ab19dSGarrett Wollman k->k_state |= KS_DELETE; 13717b6ab19dSGarrett Wollman pk = &k->k_next; 13727b6ab19dSGarrett Wollman } 13737b6ab19dSGarrett Wollman } 13747b6ab19dSGarrett Wollman } 13757b6ab19dSGarrett Wollman 13767b6ab19dSGarrett Wollman 13777b6ab19dSGarrett Wollman /* Delete a static route in the image of the kernel table. 13787b6ab19dSGarrett Wollman */ 13797b6ab19dSGarrett Wollman void 13807b6ab19dSGarrett Wollman del_static(naddr dst, 13817b6ab19dSGarrett Wollman naddr mask, 13827b6ab19dSGarrett Wollman int gone) 13837b6ab19dSGarrett Wollman { 13847b6ab19dSGarrett Wollman struct khash *k; 13857b6ab19dSGarrett Wollman struct rt_entry *rt; 13867b6ab19dSGarrett Wollman 13877b6ab19dSGarrett Wollman /* Just mark it in the table to be deleted next time the kernel 13887b6ab19dSGarrett Wollman * table is updated. 13897b6ab19dSGarrett Wollman * If it has already been deleted, mark it as such, and set its 13907b6ab19dSGarrett Wollman * keep-timer so that it will not be deleted again for a while. 13917b6ab19dSGarrett Wollman * This lets the operator delete a route added by the daemon 13927b6ab19dSGarrett Wollman * and add a replacement. 13937b6ab19dSGarrett Wollman */ 13947b6ab19dSGarrett Wollman k = kern_find(dst, mask, 0); 13957b6ab19dSGarrett Wollman if (k != 0) { 13967b6ab19dSGarrett Wollman k->k_state &= ~(KS_STATIC | KS_DYNAMIC); 13977b6ab19dSGarrett Wollman k->k_state |= KS_DELETE; 13987b6ab19dSGarrett Wollman if (gone) { 13997b6ab19dSGarrett Wollman k->k_state |= KS_DELETED; 14007b6ab19dSGarrett Wollman k->k_keep = now.tv_sec + K_KEEP_LIM; 14017b6ab19dSGarrett Wollman } 14027b6ab19dSGarrett Wollman } 14037b6ab19dSGarrett Wollman 14047b6ab19dSGarrett Wollman rt = rtget(dst, mask); 14057b6ab19dSGarrett Wollman if (rt != 0 && (rt->rt_state & RS_STATIC)) 14067b6ab19dSGarrett Wollman rtbad(rt); 14077b6ab19dSGarrett Wollman } 14087b6ab19dSGarrett Wollman 14097b6ab19dSGarrett Wollman 14107b6ab19dSGarrett Wollman /* Delete all routes generated from ICMP Redirects that use a given gateway, 14117b6ab19dSGarrett Wollman * as well as old redirected routes. 14127b6ab19dSGarrett Wollman */ 14137b6ab19dSGarrett Wollman void 14147b6ab19dSGarrett Wollman del_redirects(naddr bad_gate, 14157b6ab19dSGarrett Wollman time_t old) 14167b6ab19dSGarrett Wollman { 14177b6ab19dSGarrett Wollman int i; 14187b6ab19dSGarrett Wollman struct khash *k; 14197b6ab19dSGarrett Wollman 14207b6ab19dSGarrett Wollman 14217b6ab19dSGarrett Wollman for (i = 0; i < KHASH_SIZE; i++) { 14227b6ab19dSGarrett Wollman for (k = khash_bins[i]; k != 0; k = k->k_next) { 14237b6ab19dSGarrett Wollman if (!(k->k_state & KS_DYNAMIC) 14247b6ab19dSGarrett Wollman || (k->k_state & KS_STATIC)) 14257b6ab19dSGarrett Wollman continue; 14267b6ab19dSGarrett Wollman 14277b6ab19dSGarrett Wollman if (k->k_gate != bad_gate 14287b6ab19dSGarrett Wollman && k->k_redirect_time > old 14297b6ab19dSGarrett Wollman && !supplier) 14307b6ab19dSGarrett Wollman continue; 14317b6ab19dSGarrett Wollman 14327b6ab19dSGarrett Wollman k->k_state |= KS_DELETE; 14337b6ab19dSGarrett Wollman k->k_state &= ~KS_DYNAMIC; 14347b6ab19dSGarrett Wollman need_kern.tv_sec = now.tv_sec; 143552ad6021SGarrett Wollman trace_act("mark redirected %s --> %s for deletion", 14367b6ab19dSGarrett Wollman addrname(k->k_dst, k->k_mask, 0), 14377b6ab19dSGarrett Wollman naddr_ntoa(k->k_gate)); 14387b6ab19dSGarrett Wollman } 14397b6ab19dSGarrett Wollman } 14407b6ab19dSGarrett Wollman } 14417b6ab19dSGarrett Wollman 14427b6ab19dSGarrett Wollman 14437b6ab19dSGarrett Wollman /* Start the daemon tables. 14447b6ab19dSGarrett Wollman */ 14457b6ab19dSGarrett Wollman void 14467b6ab19dSGarrett Wollman rtinit(void) 14477b6ab19dSGarrett Wollman { 14487b6ab19dSGarrett Wollman extern int max_keylen; 14497b6ab19dSGarrett Wollman int i; 14507b6ab19dSGarrett Wollman struct ag_info *ag; 14517b6ab19dSGarrett Wollman 14527b6ab19dSGarrett Wollman /* Initialize the radix trees */ 14537b6ab19dSGarrett Wollman max_keylen = sizeof(struct sockaddr_in); 14547b6ab19dSGarrett Wollman rn_init(); 14557b6ab19dSGarrett Wollman rn_inithead((void**)&rhead, 32); 14567b6ab19dSGarrett Wollman 14577b6ab19dSGarrett Wollman /* mark all of the slots in the table free */ 14587b6ab19dSGarrett Wollman ag_avail = ag_slots; 14597b6ab19dSGarrett Wollman for (ag = ag_slots, i = 1; i < NUM_AG_SLOTS; i++) { 14607b6ab19dSGarrett Wollman ag->ag_fine = ag+1; 14617b6ab19dSGarrett Wollman ag++; 14627b6ab19dSGarrett Wollman } 14637b6ab19dSGarrett Wollman } 14647b6ab19dSGarrett Wollman 14657b6ab19dSGarrett Wollman 14667b6ab19dSGarrett Wollman #ifdef _HAVE_SIN_LEN 14677b6ab19dSGarrett Wollman static struct sockaddr_in dst_sock = {sizeof(dst_sock), AF_INET}; 14687b6ab19dSGarrett Wollman static struct sockaddr_in mask_sock = {sizeof(mask_sock), AF_INET}; 14697b6ab19dSGarrett Wollman #else 14707b6ab19dSGarrett Wollman static struct sockaddr_in_new dst_sock = {_SIN_ADDR_SIZE, AF_INET}; 14717b6ab19dSGarrett Wollman static struct sockaddr_in_new mask_sock = {_SIN_ADDR_SIZE, AF_INET}; 14727b6ab19dSGarrett Wollman #endif 14737b6ab19dSGarrett Wollman 14747b6ab19dSGarrett Wollman 14757b6ab19dSGarrett Wollman void 14767b6ab19dSGarrett Wollman set_need_flash(void) 14777b6ab19dSGarrett Wollman { 14787b6ab19dSGarrett Wollman if (!need_flash) { 14797b6ab19dSGarrett Wollman need_flash = 1; 14807b6ab19dSGarrett Wollman /* Do not send the flash update immediately. Wait a little 14817b6ab19dSGarrett Wollman * while to hear from other routers. 14827b6ab19dSGarrett Wollman */ 14837b6ab19dSGarrett Wollman no_flash.tv_sec = now.tv_sec + MIN_WAITTIME; 14847b6ab19dSGarrett Wollman } 14857b6ab19dSGarrett Wollman } 14867b6ab19dSGarrett Wollman 14877b6ab19dSGarrett Wollman 14887b6ab19dSGarrett Wollman /* Get a particular routing table entry 14897b6ab19dSGarrett Wollman */ 14907b6ab19dSGarrett Wollman struct rt_entry * 14917b6ab19dSGarrett Wollman rtget(naddr dst, naddr mask) 14927b6ab19dSGarrett Wollman { 14937b6ab19dSGarrett Wollman struct rt_entry *rt; 14947b6ab19dSGarrett Wollman 14957b6ab19dSGarrett Wollman dst_sock.sin_addr.s_addr = dst; 14967b6ab19dSGarrett Wollman mask_sock.sin_addr.s_addr = mask; 14977b6ab19dSGarrett Wollman masktrim(&mask_sock); 14987b6ab19dSGarrett Wollman rt = (struct rt_entry *)rhead->rnh_lookup(&dst_sock,&mask_sock,rhead); 14997b6ab19dSGarrett Wollman if (!rt 15007b6ab19dSGarrett Wollman || rt->rt_dst != dst 15017b6ab19dSGarrett Wollman || rt->rt_mask != mask) 15027b6ab19dSGarrett Wollman return 0; 15037b6ab19dSGarrett Wollman 15047b6ab19dSGarrett Wollman return rt; 15057b6ab19dSGarrett Wollman } 15067b6ab19dSGarrett Wollman 15077b6ab19dSGarrett Wollman 15087b6ab19dSGarrett Wollman /* Find a route to dst as the kernel would. 15097b6ab19dSGarrett Wollman */ 15107b6ab19dSGarrett Wollman struct rt_entry * 15117b6ab19dSGarrett Wollman rtfind(naddr dst) 15127b6ab19dSGarrett Wollman { 15137b6ab19dSGarrett Wollman dst_sock.sin_addr.s_addr = dst; 15147b6ab19dSGarrett Wollman return (struct rt_entry *)rhead->rnh_matchaddr(&dst_sock, rhead); 15157b6ab19dSGarrett Wollman } 15167b6ab19dSGarrett Wollman 15177b6ab19dSGarrett Wollman 15187b6ab19dSGarrett Wollman /* add a route to the table 15197b6ab19dSGarrett Wollman */ 15207b6ab19dSGarrett Wollman void 15217b6ab19dSGarrett Wollman rtadd(naddr dst, 15227b6ab19dSGarrett Wollman naddr mask, 15237b6ab19dSGarrett Wollman naddr gate, /* forward packets here */ 15247b6ab19dSGarrett Wollman naddr router, /* on the authority of this router */ 15257b6ab19dSGarrett Wollman int metric, 15267b6ab19dSGarrett Wollman u_short tag, 15277b6ab19dSGarrett Wollman u_int state, /* rs_state for the entry */ 15287b6ab19dSGarrett Wollman struct interface *ifp) 15297b6ab19dSGarrett Wollman { 15307b6ab19dSGarrett Wollman struct rt_entry *rt; 15317b6ab19dSGarrett Wollman naddr smask; 15327b6ab19dSGarrett Wollman int i; 15337b6ab19dSGarrett Wollman struct rt_spare *rts; 15347b6ab19dSGarrett Wollman 15357b6ab19dSGarrett Wollman rt = (struct rt_entry *)rtmalloc(sizeof (*rt), "rtadd"); 15367b6ab19dSGarrett Wollman bzero(rt, sizeof(*rt)); 15377b6ab19dSGarrett Wollman for (rts = rt->rt_spares, i = NUM_SPARES; i != 0; i--, rts++) 15387b6ab19dSGarrett Wollman rts->rts_metric = HOPCNT_INFINITY; 15397b6ab19dSGarrett Wollman 15407b6ab19dSGarrett Wollman rt->rt_nodes->rn_key = (caddr_t)&rt->rt_dst_sock; 15417b6ab19dSGarrett Wollman rt->rt_dst = dst; 15427b6ab19dSGarrett Wollman rt->rt_dst_sock.sin_family = AF_INET; 15437b6ab19dSGarrett Wollman #ifdef _HAVE_SIN_LEN 15447b6ab19dSGarrett Wollman rt->rt_dst_sock.sin_len = dst_sock.sin_len; 15457b6ab19dSGarrett Wollman #endif 15467b6ab19dSGarrett Wollman if (mask != HOST_MASK) { 15477b6ab19dSGarrett Wollman smask = std_mask(dst); 15487b6ab19dSGarrett Wollman if ((smask & ~mask) == 0 && mask > smask) 15497b6ab19dSGarrett Wollman state |= RS_SUBNET; 15507b6ab19dSGarrett Wollman } 15517b6ab19dSGarrett Wollman mask_sock.sin_addr.s_addr = mask; 15527b6ab19dSGarrett Wollman masktrim(&mask_sock); 15537b6ab19dSGarrett Wollman rt->rt_mask = mask; 15547b6ab19dSGarrett Wollman rt->rt_state = state; 15557b6ab19dSGarrett Wollman rt->rt_gate = gate; 15567b6ab19dSGarrett Wollman rt->rt_router = router; 15577b6ab19dSGarrett Wollman rt->rt_time = now.tv_sec; 15587b6ab19dSGarrett Wollman rt->rt_metric = metric; 15597b6ab19dSGarrett Wollman rt->rt_poison_metric = HOPCNT_INFINITY; 15607b6ab19dSGarrett Wollman rt->rt_tag = tag; 15617b6ab19dSGarrett Wollman rt->rt_ifp = ifp; 15627b6ab19dSGarrett Wollman rt->rt_seqno = update_seqno; 15637b6ab19dSGarrett Wollman 15647b6ab19dSGarrett Wollman if (++total_routes == MAX_ROUTES) 15657b6ab19dSGarrett Wollman msglog("have maximum (%d) routes", total_routes); 15667b6ab19dSGarrett Wollman if (TRACEACTIONS) 15677b6ab19dSGarrett Wollman trace_add_del("Add", rt); 15687b6ab19dSGarrett Wollman 15697b6ab19dSGarrett Wollman need_kern.tv_sec = now.tv_sec; 15707b6ab19dSGarrett Wollman set_need_flash(); 15717b6ab19dSGarrett Wollman 15727b6ab19dSGarrett Wollman if (0 == rhead->rnh_addaddr(&rt->rt_dst_sock, &mask_sock, 15737b6ab19dSGarrett Wollman rhead, rt->rt_nodes)) { 157450d2cb3eSGarrett Wollman /* 157550d2cb3eSGarrett Wollman * This will happen if RIP1 and RIP2 routeds talk to one another and 157650d2cb3eSGarrett Wollman * there are variable subnets. This is only good for filling up your 157750d2cb3eSGarrett Wollman * syslog. -jkh 157850d2cb3eSGarrett Wollman */ 157950d2cb3eSGarrett Wollman #if 0 15807b6ab19dSGarrett Wollman msglog("rnh_addaddr() failed for %s mask=%#x", 15817b6ab19dSGarrett Wollman naddr_ntoa(dst), mask); 158250d2cb3eSGarrett Wollman #endif 15837b6ab19dSGarrett Wollman } 15847b6ab19dSGarrett Wollman } 15857b6ab19dSGarrett Wollman 15867b6ab19dSGarrett Wollman 15877b6ab19dSGarrett Wollman /* notice a changed route 15887b6ab19dSGarrett Wollman */ 15897b6ab19dSGarrett Wollman void 15907b6ab19dSGarrett Wollman rtchange(struct rt_entry *rt, 15917b6ab19dSGarrett Wollman u_int state, /* new state bits */ 15927b6ab19dSGarrett Wollman naddr gate, /* now forward packets here */ 15937b6ab19dSGarrett Wollman naddr router, /* on the authority of this router */ 15947b6ab19dSGarrett Wollman int metric, /* new metric */ 15957b6ab19dSGarrett Wollman u_short tag, 15967b6ab19dSGarrett Wollman struct interface *ifp, 15977b6ab19dSGarrett Wollman time_t new_time, 15987b6ab19dSGarrett Wollman char *label) 15997b6ab19dSGarrett Wollman { 16007b6ab19dSGarrett Wollman if (rt->rt_metric != metric) { 16017b6ab19dSGarrett Wollman /* Fix the kernel immediately if it seems the route 16027b6ab19dSGarrett Wollman * has gone bad, since there may be a working route that 16037b6ab19dSGarrett Wollman * aggregates this route. 16047b6ab19dSGarrett Wollman */ 16057b6ab19dSGarrett Wollman if (metric == HOPCNT_INFINITY) { 16067b6ab19dSGarrett Wollman need_kern.tv_sec = now.tv_sec; 16077b6ab19dSGarrett Wollman if (new_time >= now.tv_sec - EXPIRE_TIME) 16087b6ab19dSGarrett Wollman new_time = now.tv_sec - EXPIRE_TIME; 16097b6ab19dSGarrett Wollman } 16107b6ab19dSGarrett Wollman rt->rt_seqno = update_seqno; 16117b6ab19dSGarrett Wollman set_need_flash(); 16127b6ab19dSGarrett Wollman } 16137b6ab19dSGarrett Wollman 16147b6ab19dSGarrett Wollman if (rt->rt_gate != gate) { 16157b6ab19dSGarrett Wollman need_kern.tv_sec = now.tv_sec; 16167b6ab19dSGarrett Wollman rt->rt_seqno = update_seqno; 16177b6ab19dSGarrett Wollman set_need_flash(); 16187b6ab19dSGarrett Wollman } 16197b6ab19dSGarrett Wollman 16207b6ab19dSGarrett Wollman state |= (rt->rt_state & RS_SUBNET); 16217b6ab19dSGarrett Wollman 16227b6ab19dSGarrett Wollman /* Keep various things from deciding ageless routes are stale. 16237b6ab19dSGarrett Wollman */ 16247b6ab19dSGarrett Wollman if (!AGE_RT(state, ifp)) 16257b6ab19dSGarrett Wollman new_time = now.tv_sec; 16267b6ab19dSGarrett Wollman 16277b6ab19dSGarrett Wollman if (TRACEACTIONS) 16287b6ab19dSGarrett Wollman trace_change(rt, state, gate, router, metric, tag, ifp, 16297b6ab19dSGarrett Wollman new_time, 16307b6ab19dSGarrett Wollman label ? label : "Chg "); 16317b6ab19dSGarrett Wollman 16327b6ab19dSGarrett Wollman rt->rt_state = state; 16337b6ab19dSGarrett Wollman rt->rt_gate = gate; 16347b6ab19dSGarrett Wollman rt->rt_router = router; 16357b6ab19dSGarrett Wollman rt->rt_metric = metric; 16367b6ab19dSGarrett Wollman rt->rt_tag = tag; 16377b6ab19dSGarrett Wollman rt->rt_ifp = ifp; 16387b6ab19dSGarrett Wollman rt->rt_time = new_time; 16397b6ab19dSGarrett Wollman } 16407b6ab19dSGarrett Wollman 16417b6ab19dSGarrett Wollman 16427b6ab19dSGarrett Wollman /* check for a better route among the spares 16437b6ab19dSGarrett Wollman */ 16447b6ab19dSGarrett Wollman static struct rt_spare * 16457b6ab19dSGarrett Wollman rts_better(struct rt_entry *rt) 16467b6ab19dSGarrett Wollman { 16477b6ab19dSGarrett Wollman struct rt_spare *rts, *rts1; 16487b6ab19dSGarrett Wollman int i; 16497b6ab19dSGarrett Wollman 16507b6ab19dSGarrett Wollman /* find the best alternative among the spares */ 16517b6ab19dSGarrett Wollman rts = rt->rt_spares+1; 16527b6ab19dSGarrett Wollman for (i = NUM_SPARES, rts1 = rts+1; i > 2; i--, rts1++) { 16537b6ab19dSGarrett Wollman if (BETTER_LINK(rt,rts1,rts)) 16547b6ab19dSGarrett Wollman rts = rts1; 16557b6ab19dSGarrett Wollman } 16567b6ab19dSGarrett Wollman 16577b6ab19dSGarrett Wollman return rts; 16587b6ab19dSGarrett Wollman } 16597b6ab19dSGarrett Wollman 16607b6ab19dSGarrett Wollman 16617b6ab19dSGarrett Wollman /* switch to a backup route 16627b6ab19dSGarrett Wollman */ 16637b6ab19dSGarrett Wollman void 16647b6ab19dSGarrett Wollman rtswitch(struct rt_entry *rt, 16657b6ab19dSGarrett Wollman struct rt_spare *rts) 16667b6ab19dSGarrett Wollman { 16677b6ab19dSGarrett Wollman struct rt_spare swap; 16687b6ab19dSGarrett Wollman char label[10]; 16697b6ab19dSGarrett Wollman 16707b6ab19dSGarrett Wollman 16717b6ab19dSGarrett Wollman /* Do not change permanent routes */ 16727b6ab19dSGarrett Wollman if (0 != (rt->rt_state & (RS_MHOME | RS_STATIC | RS_RDISC 16737b6ab19dSGarrett Wollman | RS_NET_SYN | RS_IF))) 16747b6ab19dSGarrett Wollman return; 16757b6ab19dSGarrett Wollman 16767b6ab19dSGarrett Wollman /* find the best alternative among the spares */ 16777b6ab19dSGarrett Wollman if (rts == 0) 16787b6ab19dSGarrett Wollman rts = rts_better(rt); 16797b6ab19dSGarrett Wollman 16807b6ab19dSGarrett Wollman /* Do not bother if it is not worthwhile. 16817b6ab19dSGarrett Wollman */ 16827b6ab19dSGarrett Wollman if (!BETTER_LINK(rt, rts, rt->rt_spares)) 16837b6ab19dSGarrett Wollman return; 16847b6ab19dSGarrett Wollman 16857b6ab19dSGarrett Wollman swap = rt->rt_spares[0]; 16867b6ab19dSGarrett Wollman (void)sprintf(label, "Use #%d", rts - rt->rt_spares); 16877b6ab19dSGarrett Wollman rtchange(rt, rt->rt_state & ~(RS_NET_SYN | RS_RDISC), 16887b6ab19dSGarrett Wollman rts->rts_gate, rts->rts_router, rts->rts_metric, 16897b6ab19dSGarrett Wollman rts->rts_tag, rts->rts_ifp, rts->rts_time, label); 16907b6ab19dSGarrett Wollman *rts = swap; 16917b6ab19dSGarrett Wollman } 16927b6ab19dSGarrett Wollman 16937b6ab19dSGarrett Wollman 16947b6ab19dSGarrett Wollman void 16957b6ab19dSGarrett Wollman rtdelete(struct rt_entry *rt) 16967b6ab19dSGarrett Wollman { 16977b6ab19dSGarrett Wollman struct khash *k; 16987b6ab19dSGarrett Wollman 16997b6ab19dSGarrett Wollman 17007b6ab19dSGarrett Wollman if (TRACEACTIONS) 17017b6ab19dSGarrett Wollman trace_add_del("Del", rt); 17027b6ab19dSGarrett Wollman 17037b6ab19dSGarrett Wollman k = kern_find(rt->rt_dst, rt->rt_mask, 0); 17047b6ab19dSGarrett Wollman if (k != 0) { 17057b6ab19dSGarrett Wollman k->k_state |= KS_DELETE; 17067b6ab19dSGarrett Wollman need_kern.tv_sec = now.tv_sec; 17077b6ab19dSGarrett Wollman } 17087b6ab19dSGarrett Wollman 17097b6ab19dSGarrett Wollman dst_sock.sin_addr.s_addr = rt->rt_dst; 17107b6ab19dSGarrett Wollman mask_sock.sin_addr.s_addr = rt->rt_mask; 17117b6ab19dSGarrett Wollman masktrim(&mask_sock); 17127b6ab19dSGarrett Wollman if (rt != (struct rt_entry *)rhead->rnh_deladdr(&dst_sock, &mask_sock, 17137b6ab19dSGarrett Wollman rhead)) { 17147b6ab19dSGarrett Wollman msglog("rnh_deladdr() failed"); 17157b6ab19dSGarrett Wollman } else { 17167b6ab19dSGarrett Wollman free(rt); 17177b6ab19dSGarrett Wollman total_routes--; 17187b6ab19dSGarrett Wollman } 17197b6ab19dSGarrett Wollman } 17207b6ab19dSGarrett Wollman 17217b6ab19dSGarrett Wollman 17227b6ab19dSGarrett Wollman /* Get rid of a bad route, and try to switch to a replacement. 17237b6ab19dSGarrett Wollman */ 17247b6ab19dSGarrett Wollman void 17257b6ab19dSGarrett Wollman rtbad(struct rt_entry *rt) 17267b6ab19dSGarrett Wollman { 17277b6ab19dSGarrett Wollman /* Poison the route */ 17287b6ab19dSGarrett Wollman rtchange(rt, rt->rt_state & ~(RS_IF | RS_LOCAL | RS_STATIC), 17297b6ab19dSGarrett Wollman rt->rt_gate, rt->rt_router, HOPCNT_INFINITY, rt->rt_tag, 17307b6ab19dSGarrett Wollman 0, rt->rt_time, 0); 17317b6ab19dSGarrett Wollman 17327b6ab19dSGarrett Wollman rtswitch(rt, 0); 17337b6ab19dSGarrett Wollman } 17347b6ab19dSGarrett Wollman 17357b6ab19dSGarrett Wollman 17367b6ab19dSGarrett Wollman /* Junk a RS_NET_SYN or RS_LOCAL route, 17377b6ab19dSGarrett Wollman * unless it is needed by another interface. 17387b6ab19dSGarrett Wollman */ 17397b6ab19dSGarrett Wollman void 17407b6ab19dSGarrett Wollman rtbad_sub(struct rt_entry *rt) 17417b6ab19dSGarrett Wollman { 17427b6ab19dSGarrett Wollman struct interface *ifp, *ifp1; 17437b6ab19dSGarrett Wollman struct intnet *intnetp; 17447b6ab19dSGarrett Wollman u_int state; 17457b6ab19dSGarrett Wollman 17467b6ab19dSGarrett Wollman 17477b6ab19dSGarrett Wollman ifp1 = 0; 17487b6ab19dSGarrett Wollman state = 0; 17497b6ab19dSGarrett Wollman 17507b6ab19dSGarrett Wollman if (rt->rt_state & RS_LOCAL) { 17517b6ab19dSGarrett Wollman /* Is this the route through loopback for the interface? 17527b6ab19dSGarrett Wollman * If so, see if it is used by any other interfaces, such 17537b6ab19dSGarrett Wollman * as a point-to-point interface with the same local address. 17547b6ab19dSGarrett Wollman */ 17557b6ab19dSGarrett Wollman for (ifp = ifnet; ifp != 0; ifp = ifp->int_next) { 17567b6ab19dSGarrett Wollman /* Retain it if another interface needs it. 17577b6ab19dSGarrett Wollman */ 17587b6ab19dSGarrett Wollman if (ifp->int_addr == rt->rt_ifp->int_addr) { 17597b6ab19dSGarrett Wollman state |= RS_LOCAL; 17607b6ab19dSGarrett Wollman ifp1 = ifp; 17617b6ab19dSGarrett Wollman break; 17627b6ab19dSGarrett Wollman } 17637b6ab19dSGarrett Wollman } 17647b6ab19dSGarrett Wollman 17657b6ab19dSGarrett Wollman } 17667b6ab19dSGarrett Wollman 17677b6ab19dSGarrett Wollman if (!(state & RS_LOCAL)) { 17687b6ab19dSGarrett Wollman /* Retain RIPv1 logical network route if there is another 17697b6ab19dSGarrett Wollman * interface that justifies it. 17707b6ab19dSGarrett Wollman */ 17717b6ab19dSGarrett Wollman if (rt->rt_state & RS_NET_SYN) { 17727b6ab19dSGarrett Wollman for (ifp = ifnet; ifp != 0; ifp = ifp->int_next) { 17737b6ab19dSGarrett Wollman if ((ifp->int_state & IS_NEED_NET_SYN) 17747b6ab19dSGarrett Wollman && rt->rt_mask == ifp->int_std_mask 17757b6ab19dSGarrett Wollman && rt->rt_dst == ifp->int_std_addr) { 17767b6ab19dSGarrett Wollman state |= RS_NET_SYN; 17777b6ab19dSGarrett Wollman ifp1 = ifp; 17787b6ab19dSGarrett Wollman break; 17797b6ab19dSGarrett Wollman } 17807b6ab19dSGarrett Wollman } 17817b6ab19dSGarrett Wollman } 17827b6ab19dSGarrett Wollman 17837b6ab19dSGarrett Wollman /* or if there is an authority route that needs it. */ 17847b6ab19dSGarrett Wollman for (intnetp = intnets; 17857b6ab19dSGarrett Wollman intnetp != 0; 17867b6ab19dSGarrett Wollman intnetp = intnetp->intnet_next) { 17877b6ab19dSGarrett Wollman if (intnetp->intnet_addr == rt->rt_dst 17887b6ab19dSGarrett Wollman && intnetp->intnet_mask == rt->rt_mask) { 17897b6ab19dSGarrett Wollman state |= (RS_NET_SYN | RS_NET_INT); 17907b6ab19dSGarrett Wollman break; 17917b6ab19dSGarrett Wollman } 17927b6ab19dSGarrett Wollman } 17937b6ab19dSGarrett Wollman } 17947b6ab19dSGarrett Wollman 17957b6ab19dSGarrett Wollman if (ifp1 != 0 || (state & RS_NET_SYN)) { 17967b6ab19dSGarrett Wollman rtchange(rt, ((rt->rt_state & ~(RS_NET_SYN | RS_LOCAL)) 17977b6ab19dSGarrett Wollman | state), 17987b6ab19dSGarrett Wollman rt->rt_gate, rt->rt_router, rt->rt_metric, 17997b6ab19dSGarrett Wollman rt->rt_tag, ifp1, rt->rt_time, 0); 18007b6ab19dSGarrett Wollman } else { 18017b6ab19dSGarrett Wollman rtbad(rt); 18027b6ab19dSGarrett Wollman } 18037b6ab19dSGarrett Wollman } 18047b6ab19dSGarrett Wollman 18057b6ab19dSGarrett Wollman 18067b6ab19dSGarrett Wollman /* Called while walking the table looking for sick interfaces 18077b6ab19dSGarrett Wollman * or after a time change. 18087b6ab19dSGarrett Wollman */ 18097b6ab19dSGarrett Wollman /* ARGSUSED */ 18107b6ab19dSGarrett Wollman int 18117b6ab19dSGarrett Wollman walk_bad(struct radix_node *rn, 18127b6ab19dSGarrett Wollman struct walkarg *w) 18137b6ab19dSGarrett Wollman { 18147b6ab19dSGarrett Wollman #define RT ((struct rt_entry *)rn) 18157b6ab19dSGarrett Wollman struct rt_spare *rts; 18167b6ab19dSGarrett Wollman int i; 18177b6ab19dSGarrett Wollman time_t new_time; 18187b6ab19dSGarrett Wollman 18197b6ab19dSGarrett Wollman 18207b6ab19dSGarrett Wollman /* fix any spare routes through the interface 18217b6ab19dSGarrett Wollman */ 18227b6ab19dSGarrett Wollman rts = RT->rt_spares; 18237b6ab19dSGarrett Wollman for (i = NUM_SPARES; i != 1; i--) { 18247b6ab19dSGarrett Wollman rts++; 18257b6ab19dSGarrett Wollman 18267b6ab19dSGarrett Wollman if (rts->rts_ifp != 0 18277b6ab19dSGarrett Wollman && (rts->rts_ifp->int_state & IS_BROKE)) { 18287b6ab19dSGarrett Wollman /* mark the spare route to be deleted immediately */ 18297b6ab19dSGarrett Wollman new_time = rts->rts_time; 18307b6ab19dSGarrett Wollman if (new_time >= now_garbage) 18317b6ab19dSGarrett Wollman new_time = now_garbage-1; 18327b6ab19dSGarrett Wollman trace_upslot(RT, rts, rts->rts_gate, 18337b6ab19dSGarrett Wollman rts->rts_router, 0, 18347b6ab19dSGarrett Wollman HOPCNT_INFINITY, rts->rts_tag, 18357b6ab19dSGarrett Wollman new_time); 18367b6ab19dSGarrett Wollman rts->rts_ifp = 0; 18377b6ab19dSGarrett Wollman rts->rts_metric = HOPCNT_INFINITY; 18387b6ab19dSGarrett Wollman rts->rts_time = new_time; 18397b6ab19dSGarrett Wollman } 18407b6ab19dSGarrett Wollman } 18417b6ab19dSGarrett Wollman 18427b6ab19dSGarrett Wollman /* Deal with the main route 18437b6ab19dSGarrett Wollman */ 18447b6ab19dSGarrett Wollman /* finished if it has been handled before or if its interface is ok 18457b6ab19dSGarrett Wollman */ 18467b6ab19dSGarrett Wollman if (RT->rt_ifp == 0 || !(RT->rt_ifp->int_state & IS_BROKE)) 18477b6ab19dSGarrett Wollman return 0; 18487b6ab19dSGarrett Wollman 18497b6ab19dSGarrett Wollman /* Bad routes for other than interfaces are easy. 18507b6ab19dSGarrett Wollman */ 18517b6ab19dSGarrett Wollman if (0 == (RT->rt_state & (RS_IF | RS_NET_SYN | RS_LOCAL))) { 18527b6ab19dSGarrett Wollman rtbad(RT); 18537b6ab19dSGarrett Wollman return 0; 18547b6ab19dSGarrett Wollman } 18557b6ab19dSGarrett Wollman 18567b6ab19dSGarrett Wollman rtbad_sub(RT); 18577b6ab19dSGarrett Wollman return 0; 18587b6ab19dSGarrett Wollman #undef RT 18597b6ab19dSGarrett Wollman } 18607b6ab19dSGarrett Wollman 18617b6ab19dSGarrett Wollman 18627b6ab19dSGarrett Wollman /* Check the age of an individual route. 18637b6ab19dSGarrett Wollman */ 18647b6ab19dSGarrett Wollman /* ARGSUSED */ 18657b6ab19dSGarrett Wollman static int 18667b6ab19dSGarrett Wollman walk_age(struct radix_node *rn, 18677b6ab19dSGarrett Wollman struct walkarg *w) 18687b6ab19dSGarrett Wollman { 18697b6ab19dSGarrett Wollman #define RT ((struct rt_entry *)rn) 18707b6ab19dSGarrett Wollman struct interface *ifp; 18717b6ab19dSGarrett Wollman struct rt_spare *rts; 18727b6ab19dSGarrett Wollman int i; 18737b6ab19dSGarrett Wollman 18747b6ab19dSGarrett Wollman 18757b6ab19dSGarrett Wollman /* age all of the spare routes, including the primary route 18767b6ab19dSGarrett Wollman * currently in use 18777b6ab19dSGarrett Wollman */ 18787b6ab19dSGarrett Wollman rts = RT->rt_spares; 18797b6ab19dSGarrett Wollman for (i = NUM_SPARES; i != 0; i--, rts++) { 18807b6ab19dSGarrett Wollman 18817b6ab19dSGarrett Wollman ifp = rts->rts_ifp; 18827b6ab19dSGarrett Wollman if (i == NUM_SPARES) { 18837b6ab19dSGarrett Wollman if (!AGE_RT(RT->rt_state, ifp)) { 18847b6ab19dSGarrett Wollman /* Keep various things from deciding ageless 18857b6ab19dSGarrett Wollman * routes are stale 18867b6ab19dSGarrett Wollman */ 18877b6ab19dSGarrett Wollman rts->rts_time = now.tv_sec; 18887b6ab19dSGarrett Wollman continue; 18897b6ab19dSGarrett Wollman } 18907b6ab19dSGarrett Wollman 18917b6ab19dSGarrett Wollman /* forget RIP routes after RIP has been turned off. 18927b6ab19dSGarrett Wollman */ 18937b6ab19dSGarrett Wollman if (rip_sock < 0) { 18947b6ab19dSGarrett Wollman rtdelete(RT); 18957b6ab19dSGarrett Wollman return 0; 18967b6ab19dSGarrett Wollman } 18977b6ab19dSGarrett Wollman } 18987b6ab19dSGarrett Wollman 18997b6ab19dSGarrett Wollman /* age failing routes 19007b6ab19dSGarrett Wollman */ 19017b6ab19dSGarrett Wollman if (age_bad_gate == rts->rts_gate 19027b6ab19dSGarrett Wollman && rts->rts_time >= now_stale) { 19037b6ab19dSGarrett Wollman rts->rts_time -= SUPPLY_INTERVAL; 19047b6ab19dSGarrett Wollman } 19057b6ab19dSGarrett Wollman 19067b6ab19dSGarrett Wollman /* trash the spare routes when they go bad */ 19077b6ab19dSGarrett Wollman if (rts->rts_metric < HOPCNT_INFINITY 19087b6ab19dSGarrett Wollman && now_garbage > rts->rts_time) { 19097b6ab19dSGarrett Wollman trace_upslot(RT, rts, rts->rts_gate, 19107b6ab19dSGarrett Wollman rts->rts_router, rts->rts_ifp, 19117b6ab19dSGarrett Wollman HOPCNT_INFINITY, rts->rts_tag, 19127b6ab19dSGarrett Wollman rts->rts_time); 19137b6ab19dSGarrett Wollman rts->rts_metric = HOPCNT_INFINITY; 19147b6ab19dSGarrett Wollman } 19157b6ab19dSGarrett Wollman } 19167b6ab19dSGarrett Wollman 19177b6ab19dSGarrett Wollman 19187b6ab19dSGarrett Wollman /* finished if the active route is still fresh */ 19197b6ab19dSGarrett Wollman if (now_stale <= RT->rt_time) 19207b6ab19dSGarrett Wollman return 0; 19217b6ab19dSGarrett Wollman 19227b6ab19dSGarrett Wollman /* try to switch to an alternative */ 19237b6ab19dSGarrett Wollman rtswitch(RT, 0); 19247b6ab19dSGarrett Wollman 19257b6ab19dSGarrett Wollman /* Delete a dead route after it has been publically mourned. */ 19267b6ab19dSGarrett Wollman if (now_garbage > RT->rt_time) { 19277b6ab19dSGarrett Wollman rtdelete(RT); 19287b6ab19dSGarrett Wollman return 0; 19297b6ab19dSGarrett Wollman } 19307b6ab19dSGarrett Wollman 19317b6ab19dSGarrett Wollman /* Start poisoning a bad route before deleting it. */ 19327b6ab19dSGarrett Wollman if (now.tv_sec - RT->rt_time > EXPIRE_TIME) 19337b6ab19dSGarrett Wollman rtchange(RT, RT->rt_state, RT->rt_gate, RT->rt_router, 19347b6ab19dSGarrett Wollman HOPCNT_INFINITY, RT->rt_tag, RT->rt_ifp, 19357b6ab19dSGarrett Wollman RT->rt_time, 0); 19367b6ab19dSGarrett Wollman return 0; 19377b6ab19dSGarrett Wollman } 19387b6ab19dSGarrett Wollman 19397b6ab19dSGarrett Wollman 19407b6ab19dSGarrett Wollman /* Watch for dead routes and interfaces. 19417b6ab19dSGarrett Wollman */ 19427b6ab19dSGarrett Wollman void 19437b6ab19dSGarrett Wollman age(naddr bad_gate) 19447b6ab19dSGarrett Wollman { 19457b6ab19dSGarrett Wollman struct interface *ifp; 194652ad6021SGarrett Wollman int need_query = 0; 19477b6ab19dSGarrett Wollman 194852ad6021SGarrett Wollman /* If not listening to RIP, there is no need to age the routes in 194952ad6021SGarrett Wollman * the table. 195052ad6021SGarrett Wollman */ 195152ad6021SGarrett Wollman age_timer.tv_sec = (now.tv_sec 195252ad6021SGarrett Wollman + ((rip_sock < 0) ? NEVER : SUPPLY_INTERVAL)); 19537b6ab19dSGarrett Wollman 19547b6ab19dSGarrett Wollman /* Check for dead IS_REMOTE interfaces by timing their 19557b6ab19dSGarrett Wollman * transmissions. 19567b6ab19dSGarrett Wollman */ 195752ad6021SGarrett Wollman for (ifp = ifnet; ifp; ifp = ifp->int_next) { 195852ad6021SGarrett Wollman if (!(ifp->int_state & IS_REMOTE)) 195952ad6021SGarrett Wollman continue; 19607b6ab19dSGarrett Wollman 196152ad6021SGarrett Wollman /* ignore unreachable remote interfaces */ 196252ad6021SGarrett Wollman if (!check_remote(ifp)) 196352ad6021SGarrett Wollman continue; 196452ad6021SGarrett Wollman /* Restore remote interface that has become reachable 196552ad6021SGarrett Wollman */ 196652ad6021SGarrett Wollman if (ifp->int_state & IS_BROKE) 196752ad6021SGarrett Wollman if_ok(ifp, "remote "); 196852ad6021SGarrett Wollman 196952ad6021SGarrett Wollman if (ifp->int_act_time != NEVER 197052ad6021SGarrett Wollman && now.tv_sec - ifp->int_act_time > EXPIRE_TIME) { 197152ad6021SGarrett Wollman msglog("remote interface %s to %s timed out after" 197252ad6021SGarrett Wollman " %d:%d", 19737b6ab19dSGarrett Wollman ifp->int_name, 197452ad6021SGarrett Wollman naddr_ntoa(ifp->int_dstaddr), 197552ad6021SGarrett Wollman (now.tv_sec - ifp->int_act_time)/60, 197652ad6021SGarrett Wollman (now.tv_sec - ifp->int_act_time)%60); 197752ad6021SGarrett Wollman if_sick(ifp); 19787b6ab19dSGarrett Wollman } 197952ad6021SGarrett Wollman 198052ad6021SGarrett Wollman /* If we have not heard from the other router 198152ad6021SGarrett Wollman * recently, ask it. 198252ad6021SGarrett Wollman */ 198352ad6021SGarrett Wollman if (now.tv_sec >= ifp->int_query_time) { 198452ad6021SGarrett Wollman ifp->int_query_time = NEVER; 198552ad6021SGarrett Wollman need_query = 1; 19867b6ab19dSGarrett Wollman } 19877b6ab19dSGarrett Wollman } 19887b6ab19dSGarrett Wollman 19897b6ab19dSGarrett Wollman /* Age routes. */ 19907b6ab19dSGarrett Wollman age_bad_gate = bad_gate; 19917b6ab19dSGarrett Wollman (void)rn_walktree(rhead, walk_age, 0); 19927b6ab19dSGarrett Wollman 19937b6ab19dSGarrett Wollman /* Update the kernel routing table. */ 19947b6ab19dSGarrett Wollman fix_kern(); 199552ad6021SGarrett Wollman 199652ad6021SGarrett Wollman /* poke reticent remote gateways */ 199752ad6021SGarrett Wollman if (need_query) 199852ad6021SGarrett Wollman rip_query(); 19997b6ab19dSGarrett Wollman } 2000