usr.sbin/mrouted/kern.c

   1 /*
   2  * The mrouted program is covered by the license in the accompanying file
   3  * named "LICENSE".  Use of the mrouted program represents acceptance of
   4  * the terms and conditions listed in that file.
   5  *
   6  * The mrouted program is COPYRIGHT 1989 by The Board of Trustees of
   7  * Leland Stanford Junior University.
   8  *
   9  *
  10  * kern.c,v 3.8.4.10 1998/01/06 02:00:51 fenner Exp
  11  *
  12  * $FreeBSD: src/usr.sbin/mrouted/kern.c,v 1.12 1999/08/28 01:17:04 peter Exp $
  13  * $DragonFly: src/usr.sbin/mrouted/kern.c,v 1.4 2004/12/16 03:39:05 dillon Exp $
  14  */
  15
  16 #include "defs.h"
  17
  18 int curttl = 0;
  19
  20 void
  21 k_set_rcvbuf(int bufsize, int minsize)
  22 {
  23     int delta = bufsize / 2;
  24     int iter = 0;
  25
  26     /*
  27      * Set the socket buffer.  If we can't set it as large as we
  28      * want, search around to try to find the highest acceptable
  29      * value.  The highest acceptable value being smaller than
  30      * minsize is a fatal error.
  31      */
  32     if (setsockopt(igmp_socket, SOL_SOCKET, SO_RCVBUF,
  33                 (char *)&bufsize, sizeof(bufsize)) < 0) {
  34         bufsize -= delta;
  35         while (1) {
  36             iter++;
  37             if (delta > 1)
  38                 delta /= 2;
  39
  40             if (setsockopt(igmp_socket, SOL_SOCKET, SO_RCVBUF,
  41                         (char *)&bufsize, sizeof(bufsize)) < 0) {
  42                     bufsize -= delta;
  43             } else {
  44                     if (delta < 1024)
  45                         break;
  46                     bufsize += delta;
  47             }
  48         }
  49         if (bufsize < minsize) {
  50             dolog(LOG_ERR, 0, "OS-allowed buffer size %u < app min %u",
  51                 bufsize, minsize);
  52             /*NOTREACHED*/
  53         }
  54     }
  55     IF_DEBUG(DEBUG_KERN)
  56     dolog(LOG_DEBUG, 0, "Got %d byte buffer size in %d iterations",
  57             bufsize, iter);
  58 }
  59
  60 void
  61 k_hdr_include(int boolv)
  62 {
  63 #ifdef IP_HDRINCL
  64     if (setsockopt(igmp_socket, IPPROTO_IP, IP_HDRINCL,
  65                    (char *)&boolv, sizeof(boolv)) < 0)
  66         dolog(LOG_ERR, errno, "setsockopt IP_HDRINCL %u", boolv);
  67 #endif
  68 }
  69
  70 void
  71 k_set_ttl(int t)
  72 {
  73 #ifndef RAW_OUTPUT_IS_RAW
  74     u_char ttl;
  75
  76     ttl = t;
  77     if (setsockopt(igmp_socket, IPPROTO_IP, IP_MULTICAST_TTL,
  78                    (char *)&ttl, sizeof(ttl)) < 0)
  79         dolog(LOG_ERR, errno, "setsockopt IP_MULTICAST_TTL %u", ttl);
  80 #endif
  81     curttl = t;
  82 }
  83
  84 void
  85 k_set_loop(int l)
  86 {
  87     u_char loop;
  88
  89     loop = l;
  90     if (setsockopt(igmp_socket, IPPROTO_IP, IP_MULTICAST_LOOP,
  91                    (char *)&loop, sizeof(loop)) < 0)
  92         dolog(LOG_ERR, errno, "setsockopt IP_MULTICAST_LOOP %u", loop);
  93 }
  94
  95 void
  96 k_set_if(u_int32 ifa)
  97 {
  98     struct in_addr adr;
  99
 100     adr.s_addr = ifa;
 101     if (setsockopt(igmp_socket, IPPROTO_IP, IP_MULTICAST_IF,
 102                    (char *)&adr, sizeof(adr)) < 0)
 103         dolog(LOG_ERR, errno, "setsockopt IP_MULTICAST_IF %s",
 104                             inet_fmt(ifa, s1));
 105 }
 106
 107 void
 108 k_join(u_int32 grp, u_int32 ifa)
 109 {
 110     struct ip_mreq mreq;
 111
 112     mreq.imr_multiaddr.s_addr = grp;
 113     mreq.imr_interface.s_addr = ifa;
 114
 115     if (setsockopt(igmp_socket, IPPROTO_IP, IP_ADD_MEMBERSHIP,
 116                    (char *)&mreq, sizeof(mreq)) < 0)
 117         dolog(LOG_WARNING, errno, "can't join group %s on interface %s",
 118                                 inet_fmt(grp, s1), inet_fmt(ifa, s2));
 119 }
 120
 121 void
 122 k_leave(u_int32 grp, u_int32 ifa)
 123 {
 124     struct ip_mreq mreq;
 125
 126     mreq.imr_multiaddr.s_addr = grp;
 127     mreq.imr_interface.s_addr = ifa;
 128
 129     if (setsockopt(igmp_socket, IPPROTO_IP, IP_DROP_MEMBERSHIP,
 130                    (char *)&mreq, sizeof(mreq)) < 0)
 131         dolog(LOG_WARNING, errno, "can't leave group %s on interface %s",
 132                                 inet_fmt(grp, s1), inet_fmt(ifa, s2));
 133 }
 134
 135 void
 136 k_init_dvmrp(void)
 137 {
 138 #ifdef OLD_KERNEL
 139     if (setsockopt(igmp_socket, IPPROTO_IP, MRT_INIT,
 140                    NULL, 0) < 0)
 141 #else
 142     int v=1;
 143
 144     if (setsockopt(igmp_socket, IPPROTO_IP, MRT_INIT,
 145                    (char *)&v, sizeof(int)) < 0)
 146 #endif
 147         dolog(LOG_ERR, errno, "can't enable Multicast routing in kernel");
 148 }
 149
 150 void
 151 k_stop_dvmrp(void)
 152 {
 153     if (setsockopt(igmp_socket, IPPROTO_IP, MRT_DONE,
 154                    NULL, 0) < 0)
 155         dolog(LOG_WARNING, errno, "can't disable Multicast routing in kernel");
 156 }
 157
 158 void
 159 k_add_vif(vifi_t vifi, struct uvif *v)
 160 {
 161     struct vifctl vc;
 162
 163     vc.vifc_vifi            = vifi;
 164     vc.vifc_flags           = v->uv_flags & VIFF_KERNEL_FLAGS;
 165     vc.vifc_threshold       = v->uv_threshold;
 166     vc.vifc_rate_limit      = v->uv_rate_limit;
 167     vc.vifc_lcl_addr.s_addr = v->uv_lcl_addr;
 168     vc.vifc_rmt_addr.s_addr = v->uv_rmt_addr;
 169
 170     if (setsockopt(igmp_socket, IPPROTO_IP, MRT_ADD_VIF,
 171                    (char *)&vc, sizeof(vc)) < 0)
 172         dolog(LOG_ERR, errno, "setsockopt MRT_ADD_VIF on vif %d", vifi);
 173 }
 174
 175 void
 176 k_del_vif(vifi_t vifi)
 177 {
 178
 179     if (setsockopt(igmp_socket, IPPROTO_IP, MRT_DEL_VIF,
 180                    (char *)&vifi, sizeof(vifi)) < 0)
 181         dolog(LOG_ERR, errno, "setsockopt MRT_DEL_VIF on vif %d", vifi);
 182 }
 183
 184 /*
 185  * Adds a (source, mcastgrp) entry to the kernel
 186  */
 187 void
 188 k_add_rg(u_int32 origin, struct gtable *g)
 189 {
 190     struct mfcctl mc;
 191     vifi_t i;
 192
 193 #ifdef DEBUG_MFC
 194     md_log(MD_ADD, origin, g->gt_mcastgrp);
 195 #endif
 196     /* copy table values so that setsockopt can process it */
 197     mc.mfcc_origin.s_addr = origin;
 198 #ifdef OLD_KERNEL
 199     mc.mfcc_originmask.s_addr = 0xffffffff;
 200 #endif
 201     mc.mfcc_mcastgrp.s_addr = g->gt_mcastgrp;
 202     mc.mfcc_parent = g->gt_route ? g->gt_route->rt_parent : NO_VIF;
 203     for (i = 0; i < numvifs; i++)
 204         mc.mfcc_ttls[i] = g->gt_ttls[i];
 205
 206     /* write to kernel space */
 207     if (setsockopt(igmp_socket, IPPROTO_IP, MRT_ADD_MFC,
 208                    (char *)&mc, sizeof(mc)) < 0) {
 209 #ifdef DEBUG_MFC
 210         md_log(MD_ADD_FAIL, origin, g->gt_mcastgrp);
 211 #endif
 212         dolog(LOG_WARNING, errno, "setsockopt MRT_ADD_MFC");
 213     }
 214 }
 215
 216
 217 /*
 218  * Deletes a (source, mcastgrp) entry from the kernel
 219  */
 220 int
 221 k_del_rg(u_int32 origin, struct gtable *g)
 222 {
 223     struct mfcctl mc;
 224     int retval;
 225
 226 #ifdef DEBUG_MFC
 227     md_log(MD_DEL, origin, g->gt_mcastgrp);
 228 #endif
 229     /* copy table values so that setsockopt can process it */
 230     mc.mfcc_origin.s_addr = origin;
 231 #ifdef OLD_KERNEL
 232     mc.mfcc_originmask.s_addr = 0xffffffff;
 233 #endif
 234     mc.mfcc_mcastgrp.s_addr = g->gt_mcastgrp;
 235
 236     /* write to kernel space */
 237     if ((retval = setsockopt(igmp_socket, IPPROTO_IP, MRT_DEL_MFC,
 238                    (char *)&mc, sizeof(mc))) < 0) {
 239 #ifdef DEBUG_MFC
 240         md_log(MD_DEL_FAIL, origin, g->gt_mcastgrp);
 241 #endif
 242         dolog(LOG_WARNING, errno, "setsockopt MRT_DEL_MFC of (%s %s)",
 243                 inet_fmt(origin, s1), inet_fmt(g->gt_mcastgrp, s2));
 244     }
 245
 246     return retval;
 247 }
 248
 249 /*
 250  * Get the kernel's idea of what version of mrouted needs to run with it.
 251  */
 252 int
 253 k_get_version(void)
 254 {
 255 #ifdef OLD_KERNEL
 256     return -1;
 257 #else
 258     int vers;
 259     int len = sizeof(vers);
 260
 261     if (getsockopt(igmp_socket, IPPROTO_IP, MRT_VERSION,
 262                         (char *)&vers, &len) < 0)
 263         dolog(LOG_ERR, errno,
 264                 "getsockopt MRT_VERSION: perhaps your kernel is too old");
 265
 266     return vers;
 267 #endif
 268 }