+
+#ifdef MULTICAST
+u_char ether_ipmulticast_min[6] = { 0x01, 0x00, 0x5e, 0x00, 0x00, 0x00 };
+u_char ether_ipmulticast_max[6] = { 0x01, 0x00, 0x5e, 0x7f, 0xff, 0xff };
+/*
+ * Add an Ethernet multicast address or range of addresses to the list for a
+ * given interface.
+ */
+int
+ether_addmulti(ifr, ac)
+ struct ifreq *ifr;
+ register struct arpcom *ac;
+{
+ register struct ether_multi *enm;
+ struct sockaddr_in *sin;
+ u_char addrlo[6];
+ u_char addrhi[6];
+ int s = splimp();
+
+ switch (ifr->ifr_addr.sa_family) {
+
+ case AF_UNSPEC:
+ bcopy(ifr->ifr_addr.sa_data, addrlo, 6);
+ bcopy(addrlo, addrhi, 6);
+ break;
+
+#ifdef INET
+ case AF_INET:
+ sin = (struct sockaddr_in *)&(ifr->ifr_addr);
+ if (sin->sin_addr.s_addr == INADDR_ANY) {
+ /*
+ * An IP address of INADDR_ANY means listen to all
+ * of the Ethernet multicast addresses used for IP.
+ * (This is for the sake of IP multicast routers.)
+ */
+ bcopy(ether_ipmulticast_min, addrlo, 6);
+ bcopy(ether_ipmulticast_max, addrhi, 6);
+ }
+ else {
+ ETHER_MAP_IP_MULTICAST(&sin->sin_addr, addrlo);
+ bcopy(addrlo, addrhi, 6);
+ }
+ break;
+#endif
+
+ default:
+ splx(s);
+ return (EAFNOSUPPORT);
+ }
+
+ /*
+ * Verify that we have valid Ethernet multicast addresses.
+ */
+ if ((addrlo[0] & 0x01) != 1 || (addrhi[0] & 0x01) != 1) {
+ splx(s);
+ return (EINVAL);
+ }
+ /*
+ * See if the address range is already in the list.
+ */
+ ETHER_LOOKUP_MULTI(addrlo, addrhi, ac, enm);
+ if (enm != NULL) {
+ /*
+ * Found it; just increment the reference count.
+ */
+ ++enm->enm_refcount;
+ splx(s);
+ return (0);
+ }
+ /*
+ * New address or range; malloc a new multicast record
+ * and link it into the interface's multicast list.
+ */
+ enm = (struct ether_multi *)malloc(sizeof(*enm), M_IFMADDR, M_NOWAIT);
+ if (enm == NULL) {
+ splx(s);
+ return (ENOBUFS);
+ }
+ bcopy(addrlo, enm->enm_addrlo, 6);
+ bcopy(addrhi, enm->enm_addrhi, 6);
+ enm->enm_ac = ac;
+ enm->enm_refcount = 1;
+ enm->enm_next = ac->ac_multiaddrs;
+ ac->ac_multiaddrs = enm;
+ ac->ac_multicnt++;
+ splx(s);
+ /*
+ * Return ENETRESET to inform the driver that the list has changed
+ * and its reception filter should be adjusted accordingly.
+ */
+ return (ENETRESET);
+}
+
+/*
+ * Delete a multicast address record.
+ */
+int
+ether_delmulti(ifr, ac)
+ struct ifreq *ifr;
+ register struct arpcom *ac;
+{
+ register struct ether_multi *enm;
+ register struct ether_multi **p;
+ struct sockaddr_in *sin;
+ u_char addrlo[6];
+ u_char addrhi[6];
+ int s = splimp();
+
+ switch (ifr->ifr_addr.sa_family) {
+
+ case AF_UNSPEC:
+ bcopy(ifr->ifr_addr.sa_data, addrlo, 6);
+ bcopy(addrlo, addrhi, 6);
+ break;
+
+#ifdef INET
+ case AF_INET:
+ sin = (struct sockaddr_in *)&(ifr->ifr_addr);
+ if (sin->sin_addr.s_addr == INADDR_ANY) {
+ /*
+ * An IP address of INADDR_ANY means stop listening
+ * to the range of Ethernet multicast addresses used
+ * for IP.
+ */
+ bcopy(ether_ipmulticast_min, addrlo, 6);
+ bcopy(ether_ipmulticast_max, addrhi, 6);
+ }
+ else {
+ ETHER_MAP_IP_MULTICAST(&sin->sin_addr, addrlo);
+ bcopy(addrlo, addrhi, 6);
+ }
+ break;
+#endif
+
+ default:
+ splx(s);
+ return (EAFNOSUPPORT);
+ }
+
+ /*
+ * Look up the address in our list.
+ */
+ ETHER_LOOKUP_MULTI(addrlo, addrhi, ac, enm);
+ if (enm == NULL) {
+ splx(s);
+ return (ENXIO);
+ }
+ if (--enm->enm_refcount != 0) {
+ /*
+ * Still some claims to this record.
+ */
+ splx(s);
+ return (0);
+ }
+ /*
+ * No remaining claims to this record; unlink and free it.
+ */
+ for (p = &enm->enm_ac->ac_multiaddrs;
+ *p != enm;
+ p = &(*p)->enm_next)
+ continue;
+ *p = (*p)->enm_next;
+ free(enm, M_IFMADDR);
+ ac->ac_multicnt--;
+ splx(s);
+ /*
+ * Return ENETRESET to inform the driver that the list has changed
+ * and its reception filter should be adjusted accordingly.
+ */
+ return (ENETRESET);
+}
+#endif
projects / unix-history / commitdiff