[39e6e65a] | 1 | /* |
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| 2 | * Copyright (c) 1982, 1986, 1991, 1993 |
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| 3 | * The Regents of the University of California. All rights reserved. |
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| 4 | * |
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| 5 | * Redistribution and use in source and binary forms, with or without |
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| 6 | * modification, are permitted provided that the following conditions |
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| 7 | * are met: |
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| 8 | * 1. Redistributions of source code must retain the above copyright |
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| 9 | * notice, this list of conditions and the following disclaimer. |
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| 10 | * 2. Redistributions in binary form must reproduce the above copyright |
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| 11 | * notice, this list of conditions and the following disclaimer in the |
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| 12 | * documentation and/or other materials provided with the distribution. |
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| 13 | * 4. Neither the name of the University nor the names of its contributors |
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| 14 | * may be used to endorse or promote products derived from this software |
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| 15 | * without specific prior written permission. |
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| 16 | * |
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
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| 18 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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| 19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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| 20 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
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| 21 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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| 22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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| 23 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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| 24 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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| 25 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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| 26 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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| 27 | * SUCH DAMAGE. |
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| 28 | * |
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| 29 | * @(#)in.c 8.4 (Berkeley) 1/9/95 |
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[50c0d1f] | 30 | * $FreeBSD: src/sys/netinet/in.c,v 1.75 2004/04/07 20:46:13 imp Exp $ |
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[39e6e65a] | 31 | */ |
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| 32 | |
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| 33 | #include <sys/param.h> |
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[c301570] | 34 | #include <rtems/bsd/sys/queue.h> |
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[39e6e65a] | 35 | #include <sys/systm.h> |
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| 36 | #include <sys/ioctl.h> |
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[b3f8c9e1] | 37 | #include <errno.h> |
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[39e6e65a] | 38 | #include <sys/malloc.h> |
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| 39 | #include <sys/socket.h> |
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| 40 | #include <sys/socketvar.h> |
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| 41 | #include <sys/kernel.h> |
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| 42 | #include <sys/sysctl.h> |
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| 43 | |
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| 44 | #include <net/if.h> |
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| 45 | #include <net/route.h> |
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| 46 | |
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| 47 | #include <netinet/in_systm.h> |
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| 48 | #include <netinet/in.h> |
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| 49 | #include <netinet/in_var.h> |
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| 50 | #include <netinet/if_ether.h> |
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| 51 | |
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| 52 | #include <netinet/igmp_var.h> |
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| 53 | |
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| 54 | /* |
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| 55 | * This structure is used to keep track of in_multi chains which belong to |
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| 56 | * deleted interface addresses. |
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| 57 | */ |
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| 58 | static LIST_HEAD(, multi_kludge) in_mk; /* XXX BSS initialization */ |
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| 59 | |
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| 60 | struct multi_kludge { |
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| 61 | LIST_ENTRY(multi_kludge) mk_entry; |
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| 62 | struct ifnet *mk_ifp; |
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| 63 | struct in_multihead mk_head; |
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| 64 | }; |
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| 65 | |
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[e5d6315e] | 66 | static void in_socktrim(struct sockaddr_in *); |
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| 67 | static int in_ifinit(struct ifnet *, |
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| 68 | struct in_ifaddr *, struct sockaddr_in *, int); |
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| 69 | static void in_ifscrub(struct ifnet *, struct in_ifaddr *); |
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[39e6e65a] | 70 | |
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| 71 | static int subnetsarelocal = 0; |
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| 72 | SYSCTL_INT(_net_inet_ip, OID_AUTO, subnets_are_local, CTLFLAG_RW, |
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| 73 | &subnetsarelocal, 0, ""); |
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| 74 | /* |
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| 75 | * Return 1 if an internet address is for a ``local'' host |
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| 76 | * (one to which we have a connection). If subnetsarelocal |
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| 77 | * is true, this includes other subnets of the local net. |
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| 78 | * Otherwise, it includes only the directly-connected (sub)nets. |
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| 79 | */ |
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| 80 | int |
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[dd967330] | 81 | in_localaddr(struct in_addr in) |
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[39e6e65a] | 82 | { |
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| 83 | register u_long i = ntohl(in.s_addr); |
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| 84 | register struct in_ifaddr *ia; |
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| 85 | |
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| 86 | if (subnetsarelocal) { |
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| 87 | for (ia = in_ifaddr; ia; ia = ia->ia_next) |
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| 88 | if ((i & ia->ia_netmask) == ia->ia_net) |
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| 89 | return (1); |
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| 90 | } else { |
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| 91 | for (ia = in_ifaddr; ia; ia = ia->ia_next) |
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| 92 | if ((i & ia->ia_subnetmask) == ia->ia_subnet) |
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| 93 | return (1); |
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| 94 | } |
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| 95 | return (0); |
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| 96 | } |
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| 97 | |
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| 98 | /* |
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| 99 | * Determine whether an IP address is in a reserved set of addresses |
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| 100 | * that may not be forwarded, or whether datagrams to that destination |
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| 101 | * may be forwarded. |
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| 102 | */ |
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| 103 | int |
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[dd967330] | 104 | in_canforward(struct in_addr in) |
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[39e6e65a] | 105 | { |
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| 106 | register u_long i = ntohl(in.s_addr); |
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| 107 | register u_long net; |
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| 108 | |
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| 109 | if (IN_EXPERIMENTAL(i) || IN_MULTICAST(i)) |
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| 110 | return (0); |
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| 111 | if (IN_CLASSA(i)) { |
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| 112 | net = i & IN_CLASSA_NET; |
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| 113 | if (net == 0 || net == (IN_LOOPBACKNET << IN_CLASSA_NSHIFT)) |
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| 114 | return (0); |
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| 115 | } |
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| 116 | return (1); |
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| 117 | } |
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| 118 | |
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| 119 | /* |
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| 120 | * Trim a mask in a sockaddr |
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| 121 | */ |
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| 122 | static void |
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[dd967330] | 123 | in_socktrim(struct sockaddr_in *ap) |
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[39e6e65a] | 124 | { |
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| 125 | register char *cplim = (char *) &ap->sin_addr; |
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| 126 | register char *cp = (char *) (&ap->sin_addr + 1); |
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| 127 | |
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| 128 | ap->sin_len = 0; |
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| 129 | while (--cp >= cplim) |
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| 130 | if (*cp) { |
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| 131 | (ap)->sin_len = cp - (char *) (ap) + 1; |
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| 132 | break; |
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| 133 | } |
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| 134 | } |
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| 135 | |
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| 136 | static int in_interfaces; /* number of external internet interfaces */ |
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| 137 | |
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| 138 | /* |
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| 139 | * Generic internet control operations (ioctl's). |
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| 140 | * Ifp is 0 if not an interface-specific ioctl. |
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| 141 | */ |
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| 142 | int |
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[dd967330] | 143 | in_control(struct socket *so, u_long cmd, caddr_t data, struct ifnet *ifp) |
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[39e6e65a] | 144 | { |
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| 145 | register struct ifreq *ifr = (struct ifreq *)data; |
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| 146 | register struct in_ifaddr *ia = 0, *iap; |
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| 147 | register struct ifaddr *ifa; |
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| 148 | struct in_ifaddr *oia; |
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| 149 | struct in_aliasreq *ifra = (struct in_aliasreq *)data; |
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| 150 | struct sockaddr_in oldaddr; |
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| 151 | int error, hostIsNew, maskIsNew, s; |
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| 152 | struct multi_kludge *mk; |
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| 153 | |
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| 154 | /* |
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| 155 | * Find address for this interface, if it exists. |
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| 156 | * |
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| 157 | * If an alias address was specified, find that one instead of |
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| 158 | * the first one on the interface. |
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| 159 | */ |
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| 160 | if (ifp) |
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| 161 | for (iap = in_ifaddr; iap; iap = iap->ia_next) |
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| 162 | if (iap->ia_ifp == ifp) { |
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| 163 | if (((struct sockaddr_in *)&ifr->ifr_addr)->sin_addr.s_addr == |
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| 164 | iap->ia_addr.sin_addr.s_addr) { |
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| 165 | ia = iap; |
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| 166 | break; |
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| 167 | } else if (ia == NULL) { |
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| 168 | ia = iap; |
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| 169 | if (ifr->ifr_addr.sa_family != AF_INET) |
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| 170 | break; |
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| 171 | } |
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| 172 | } |
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| 173 | |
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| 174 | switch (cmd) { |
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| 175 | |
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| 176 | case SIOCAIFADDR: |
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| 177 | case SIOCDIFADDR: |
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| 178 | if (ifra->ifra_addr.sin_family == AF_INET) { |
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| 179 | for (oia = ia; ia; ia = ia->ia_next) { |
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| 180 | if (ia->ia_ifp == ifp && |
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| 181 | ia->ia_addr.sin_addr.s_addr == |
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| 182 | ifra->ifra_addr.sin_addr.s_addr) |
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| 183 | break; |
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| 184 | } |
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| 185 | if ((ifp->if_flags & IFF_POINTOPOINT) |
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| 186 | && (cmd == SIOCAIFADDR) |
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| 187 | && (ifra->ifra_dstaddr.sin_addr.s_addr |
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| 188 | == INADDR_ANY)) { |
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| 189 | return EDESTADDRREQ; |
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| 190 | } |
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| 191 | } |
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| 192 | if (cmd == SIOCDIFADDR && ia == 0) |
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| 193 | return (EADDRNOTAVAIL); |
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| 194 | /* FALLTHROUGH */ |
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| 195 | case SIOCSIFADDR: |
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| 196 | case SIOCSIFNETMASK: |
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| 197 | case SIOCSIFDSTADDR: |
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| 198 | if ((so->so_state & SS_PRIV) == 0) |
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| 199 | return (EPERM); |
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| 200 | |
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| 201 | if (ifp == 0) |
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| 202 | panic("in_control"); |
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| 203 | if (ia == (struct in_ifaddr *)0) { |
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| 204 | oia = (struct in_ifaddr *) |
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| 205 | malloc(sizeof *oia, M_IFADDR, M_WAITOK); |
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| 206 | if (oia == (struct in_ifaddr *)NULL) |
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| 207 | return (ENOBUFS); |
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| 208 | bzero((caddr_t)oia, sizeof *oia); |
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| 209 | ia = in_ifaddr; |
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| 210 | /* |
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| 211 | * Protect from ipintr() traversing address list |
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| 212 | * while we're modifying it. |
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| 213 | */ |
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| 214 | s = splnet(); |
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| 215 | |
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| 216 | if (ia) { |
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| 217 | for ( ; ia->ia_next; ia = ia->ia_next) |
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| 218 | continue; |
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| 219 | ia->ia_next = oia; |
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| 220 | } else |
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| 221 | in_ifaddr = oia; |
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| 222 | ia = oia; |
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| 223 | ifa = ifp->if_addrlist; |
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| 224 | if (ifa) { |
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| 225 | for ( ; ifa->ifa_next; ifa = ifa->ifa_next) |
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| 226 | continue; |
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| 227 | ifa->ifa_next = (struct ifaddr *) ia; |
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| 228 | } else |
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| 229 | ifp->if_addrlist = (struct ifaddr *) ia; |
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| 230 | ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr; |
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| 231 | ia->ia_ifa.ifa_dstaddr |
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| 232 | = (struct sockaddr *)&ia->ia_dstaddr; |
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| 233 | ia->ia_ifa.ifa_netmask |
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| 234 | = (struct sockaddr *)&ia->ia_sockmask; |
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| 235 | ia->ia_sockmask.sin_len = 8; |
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| 236 | if (ifp->if_flags & IFF_BROADCAST) { |
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| 237 | ia->ia_broadaddr.sin_len = sizeof(ia->ia_addr); |
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| 238 | ia->ia_broadaddr.sin_family = AF_INET; |
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| 239 | } |
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| 240 | ia->ia_ifp = ifp; |
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| 241 | if (!(ifp->if_flags & IFF_LOOPBACK)) |
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| 242 | in_interfaces++; |
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| 243 | splx(s); |
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| 244 | } |
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| 245 | break; |
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| 246 | |
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| 247 | case SIOCSIFBRDADDR: |
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| 248 | if ((so->so_state & SS_PRIV) == 0) |
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| 249 | return (EPERM); |
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| 250 | /* FALLTHROUGH */ |
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| 251 | |
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| 252 | case SIOCGIFADDR: |
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| 253 | case SIOCGIFNETMASK: |
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| 254 | case SIOCGIFDSTADDR: |
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| 255 | case SIOCGIFBRDADDR: |
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| 256 | if (ia == (struct in_ifaddr *)0) |
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| 257 | return (EADDRNOTAVAIL); |
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| 258 | break; |
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| 259 | } |
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| 260 | switch (cmd) { |
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| 261 | |
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| 262 | case SIOCGIFADDR: |
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| 263 | *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_addr; |
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| 264 | break; |
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| 265 | |
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| 266 | case SIOCGIFBRDADDR: |
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| 267 | if ((ifp->if_flags & IFF_BROADCAST) == 0) |
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| 268 | return (EINVAL); |
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| 269 | *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_broadaddr; |
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| 270 | break; |
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| 271 | |
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| 272 | case SIOCGIFDSTADDR: |
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| 273 | if ((ifp->if_flags & IFF_POINTOPOINT) == 0) |
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| 274 | return (EINVAL); |
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| 275 | *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_dstaddr; |
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| 276 | break; |
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| 277 | |
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| 278 | case SIOCGIFNETMASK: |
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| 279 | *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_sockmask; |
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| 280 | break; |
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| 281 | |
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| 282 | case SIOCSIFDSTADDR: |
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| 283 | if ((ifp->if_flags & IFF_POINTOPOINT) == 0) |
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| 284 | return (EINVAL); |
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| 285 | oldaddr = ia->ia_dstaddr; |
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| 286 | ia->ia_dstaddr = *(struct sockaddr_in *)&ifr->ifr_dstaddr; |
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| 287 | if (ifp->if_ioctl && (error = (*ifp->if_ioctl) |
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| 288 | (ifp, SIOCSIFDSTADDR, (caddr_t)ia))) { |
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| 289 | ia->ia_dstaddr = oldaddr; |
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| 290 | return (error); |
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| 291 | } |
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| 292 | if (ia->ia_flags & IFA_ROUTE) { |
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| 293 | ia->ia_ifa.ifa_dstaddr = (struct sockaddr *)&oldaddr; |
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| 294 | rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST); |
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| 295 | ia->ia_ifa.ifa_dstaddr = |
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| 296 | (struct sockaddr *)&ia->ia_dstaddr; |
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| 297 | rtinit(&(ia->ia_ifa), (int)RTM_ADD, RTF_HOST|RTF_UP); |
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| 298 | } |
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| 299 | break; |
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| 300 | |
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| 301 | case SIOCSIFBRDADDR: |
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| 302 | if ((ifp->if_flags & IFF_BROADCAST) == 0) |
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| 303 | return (EINVAL); |
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| 304 | ia->ia_broadaddr = *(struct sockaddr_in *)&ifr->ifr_broadaddr; |
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| 305 | break; |
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| 306 | |
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| 307 | case SIOCSIFADDR: |
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| 308 | return (in_ifinit(ifp, ia, |
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| 309 | (struct sockaddr_in *) &ifr->ifr_addr, 1)); |
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| 310 | |
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| 311 | case SIOCSIFNETMASK: |
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[50c0d1f] | 312 | ia->ia_sockmask.sin_addr = ifra->ifra_addr.sin_addr; |
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| 313 | ia->ia_subnetmask = ntohl(ia->ia_sockmask.sin_addr.s_addr); |
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[39e6e65a] | 314 | break; |
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| 315 | |
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| 316 | case SIOCAIFADDR: |
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| 317 | maskIsNew = 0; |
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| 318 | hostIsNew = 1; |
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| 319 | error = 0; |
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| 320 | if (ia->ia_addr.sin_family == AF_INET) { |
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| 321 | if (ifra->ifra_addr.sin_len == 0) { |
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| 322 | ifra->ifra_addr = ia->ia_addr; |
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| 323 | hostIsNew = 0; |
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| 324 | } else if (ifra->ifra_addr.sin_addr.s_addr == |
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| 325 | ia->ia_addr.sin_addr.s_addr) |
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| 326 | hostIsNew = 0; |
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| 327 | } |
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| 328 | if (ifra->ifra_mask.sin_len) { |
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| 329 | in_ifscrub(ifp, ia); |
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| 330 | ia->ia_sockmask = ifra->ifra_mask; |
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| 331 | ia->ia_subnetmask = |
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| 332 | ntohl(ia->ia_sockmask.sin_addr.s_addr); |
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| 333 | maskIsNew = 1; |
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| 334 | } |
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| 335 | if ((ifp->if_flags & IFF_POINTOPOINT) && |
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| 336 | (ifra->ifra_dstaddr.sin_family == AF_INET)) { |
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| 337 | in_ifscrub(ifp, ia); |
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| 338 | ia->ia_dstaddr = ifra->ifra_dstaddr; |
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| 339 | maskIsNew = 1; /* We lie; but the effect's the same */ |
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| 340 | } |
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| 341 | if (ifra->ifra_addr.sin_family == AF_INET && |
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| 342 | (hostIsNew || maskIsNew)) |
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| 343 | error = in_ifinit(ifp, ia, &ifra->ifra_addr, 0); |
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| 344 | if ((ifp->if_flags & IFF_BROADCAST) && |
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| 345 | (ifra->ifra_broadaddr.sin_family == AF_INET)) |
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| 346 | ia->ia_broadaddr = ifra->ifra_broadaddr; |
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| 347 | return (error); |
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| 348 | |
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| 349 | case SIOCDIFADDR: |
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| 350 | mk = malloc(sizeof *mk, M_IPMADDR, M_WAITOK); |
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| 351 | if (!mk) |
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| 352 | return ENOBUFS; |
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| 353 | |
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| 354 | in_ifscrub(ifp, ia); |
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| 355 | /* |
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| 356 | * Protect from ipintr() traversing address list |
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| 357 | * while we're modifying it. |
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| 358 | */ |
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| 359 | s = splnet(); |
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| 360 | |
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| 361 | if ((ifa = ifp->if_addrlist) == (struct ifaddr *)ia) |
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| 362 | ifp->if_addrlist = ifa->ifa_next; |
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| 363 | else { |
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| 364 | while (ifa->ifa_next && |
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| 365 | (ifa->ifa_next != (struct ifaddr *)ia)) |
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| 366 | ifa = ifa->ifa_next; |
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| 367 | if (ifa->ifa_next) |
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| 368 | ifa->ifa_next = ((struct ifaddr *)ia)->ifa_next; |
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| 369 | else |
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| 370 | printf("Couldn't unlink inifaddr from ifp\n"); |
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| 371 | } |
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| 372 | oia = ia; |
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| 373 | if (oia == (ia = in_ifaddr)) |
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| 374 | in_ifaddr = ia->ia_next; |
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| 375 | else { |
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| 376 | while (ia->ia_next && (ia->ia_next != oia)) |
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| 377 | ia = ia->ia_next; |
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| 378 | if (ia->ia_next) |
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| 379 | ia->ia_next = oia->ia_next; |
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| 380 | else |
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| 381 | printf("Didn't unlink inifadr from list\n"); |
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| 382 | } |
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| 383 | |
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| 384 | if (!oia->ia_multiaddrs.lh_first) { |
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| 385 | IFAFREE(&oia->ia_ifa); |
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| 386 | FREE(mk, M_IPMADDR); |
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| 387 | splx(s); |
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| 388 | break; |
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| 389 | } |
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| 390 | |
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| 391 | /* |
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| 392 | * Multicast address kludge: |
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| 393 | * If there were any multicast addresses attached to this |
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| 394 | * interface address, either move them to another address |
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| 395 | * on this interface, or save them until such time as this |
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| 396 | * interface is reconfigured for IP. |
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| 397 | */ |
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| 398 | IFP_TO_IA(oia->ia_ifp, ia); |
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| 399 | if (ia) { /* there is another address */ |
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| 400 | struct in_multi *inm; |
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| 401 | for(inm = oia->ia_multiaddrs.lh_first; inm; |
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| 402 | inm = inm->inm_entry.le_next) { |
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| 403 | IFAFREE(&inm->inm_ia->ia_ifa); |
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| 404 | ia->ia_ifa.ifa_refcnt++; |
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| 405 | inm->inm_ia = ia; |
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| 406 | LIST_INSERT_HEAD(&ia->ia_multiaddrs, inm, |
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| 407 | inm_entry); |
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| 408 | } |
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| 409 | FREE(mk, M_IPMADDR); |
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| 410 | } else { /* last address on this if deleted, save */ |
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| 411 | struct in_multi *inm; |
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| 412 | |
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| 413 | LIST_INIT(&mk->mk_head); |
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| 414 | mk->mk_ifp = ifp; |
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| 415 | |
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| 416 | for(inm = oia->ia_multiaddrs.lh_first; inm; |
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| 417 | inm = inm->inm_entry.le_next) { |
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| 418 | LIST_INSERT_HEAD(&mk->mk_head, inm, inm_entry); |
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| 419 | } |
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| 420 | |
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| 421 | if (mk->mk_head.lh_first) { |
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| 422 | LIST_INSERT_HEAD(&in_mk, mk, mk_entry); |
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| 423 | } else { |
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| 424 | FREE(mk, M_IPMADDR); |
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| 425 | } |
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| 426 | } |
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| 427 | |
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| 428 | IFAFREE((&oia->ia_ifa)); |
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| 429 | splx(s); |
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| 430 | break; |
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| 431 | |
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| 432 | default: |
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| 433 | if (ifp == 0 || ifp->if_ioctl == 0) |
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| 434 | return (EOPNOTSUPP); |
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| 435 | return ((*ifp->if_ioctl)(ifp, cmd, data)); |
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| 436 | } |
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| 437 | return (0); |
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| 438 | } |
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| 439 | |
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| 440 | /* |
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| 441 | * Delete any existing route for an interface. |
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| 442 | */ |
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| 443 | static void |
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[dd967330] | 444 | in_ifscrub(struct ifnet *ifp, struct in_ifaddr *ia) |
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[39e6e65a] | 445 | { |
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| 446 | |
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| 447 | if ((ia->ia_flags & IFA_ROUTE) == 0) |
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| 448 | return; |
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| 449 | if (ifp->if_flags & (IFF_LOOPBACK|IFF_POINTOPOINT)) |
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| 450 | rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST); |
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| 451 | else |
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| 452 | rtinit(&(ia->ia_ifa), (int)RTM_DELETE, 0); |
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| 453 | ia->ia_flags &= ~IFA_ROUTE; |
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| 454 | } |
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| 455 | |
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| 456 | /* |
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| 457 | * Initialize an interface's internet address |
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| 458 | * and routing table entry. |
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| 459 | */ |
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| 460 | static int |
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[dd967330] | 461 | in_ifinit(struct ifnet *ifp, struct in_ifaddr *ia, struct sockaddr_in *sin, |
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| 462 | int scrub) |
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[39e6e65a] | 463 | { |
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| 464 | register u_long i = ntohl(sin->sin_addr.s_addr); |
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| 465 | struct sockaddr_in oldaddr; |
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| 466 | int s = splimp(), flags = RTF_UP, error; |
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| 467 | struct multi_kludge *mk; |
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| 468 | |
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| 469 | oldaddr = ia->ia_addr; |
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| 470 | ia->ia_addr = *sin; |
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| 471 | /* |
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| 472 | * Give the interface a chance to initialize |
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| 473 | * if this is its first address, |
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| 474 | * and to validate the address if necessary. |
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| 475 | */ |
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| 476 | if (ifp->if_ioctl && |
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| 477 | (error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia))) { |
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| 478 | splx(s); |
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| 479 | ia->ia_addr = oldaddr; |
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| 480 | return (error); |
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| 481 | } |
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| 482 | splx(s); |
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| 483 | if (scrub) { |
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| 484 | ia->ia_ifa.ifa_addr = (struct sockaddr *)&oldaddr; |
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| 485 | in_ifscrub(ifp, ia); |
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| 486 | ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr; |
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| 487 | } |
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| 488 | if (IN_CLASSA(i)) |
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| 489 | ia->ia_netmask = IN_CLASSA_NET; |
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| 490 | else if (IN_CLASSB(i)) |
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| 491 | ia->ia_netmask = IN_CLASSB_NET; |
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| 492 | else |
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| 493 | ia->ia_netmask = IN_CLASSC_NET; |
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| 494 | /* |
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| 495 | * The subnet mask usually includes at least the standard network part, |
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| 496 | * but may may be smaller in the case of supernetting. |
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| 497 | * If it is set, we believe it. |
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| 498 | */ |
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| 499 | if (ia->ia_subnetmask == 0) { |
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| 500 | ia->ia_subnetmask = ia->ia_netmask; |
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| 501 | ia->ia_sockmask.sin_addr.s_addr = htonl(ia->ia_subnetmask); |
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| 502 | } else |
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| 503 | ia->ia_netmask &= ia->ia_subnetmask; |
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| 504 | ia->ia_net = i & ia->ia_netmask; |
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| 505 | ia->ia_subnet = i & ia->ia_subnetmask; |
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| 506 | in_socktrim(&ia->ia_sockmask); |
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| 507 | /* |
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| 508 | * Add route for the network. |
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| 509 | */ |
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| 510 | ia->ia_ifa.ifa_metric = ifp->if_metric; |
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| 511 | if (ifp->if_flags & IFF_BROADCAST) { |
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| 512 | ia->ia_broadaddr.sin_addr.s_addr = |
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| 513 | htonl(ia->ia_subnet | ~ia->ia_subnetmask); |
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| 514 | ia->ia_netbroadcast.s_addr = |
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| 515 | htonl(ia->ia_net | ~ ia->ia_netmask); |
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| 516 | } else if (ifp->if_flags & IFF_LOOPBACK) { |
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| 517 | ia->ia_ifa.ifa_dstaddr = ia->ia_ifa.ifa_addr; |
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| 518 | flags |= RTF_HOST; |
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| 519 | } else if (ifp->if_flags & IFF_POINTOPOINT) { |
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| 520 | if (ia->ia_dstaddr.sin_family != AF_INET) |
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| 521 | return (0); |
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| 522 | flags |= RTF_HOST; |
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| 523 | } |
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| 524 | if ((error = rtinit(&(ia->ia_ifa), (int)RTM_ADD, flags)) == 0) |
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| 525 | ia->ia_flags |= IFA_ROUTE; |
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| 526 | |
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| 527 | LIST_INIT(&ia->ia_multiaddrs); |
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| 528 | /* |
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| 529 | * If the interface supports multicast, join the "all hosts" |
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| 530 | * multicast group on that interface. |
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| 531 | */ |
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| 532 | if (ifp->if_flags & IFF_MULTICAST) { |
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| 533 | struct in_addr addr; |
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| 534 | |
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| 535 | /* |
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| 536 | * Continuation of multicast address hack: |
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| 537 | * If there was a multicast group list previously saved |
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| 538 | * for this interface, then we re-attach it to the first |
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| 539 | * address configured on the i/f. |
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| 540 | */ |
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| 541 | for(mk = in_mk.lh_first; mk; mk = mk->mk_entry.le_next) { |
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| 542 | if(mk->mk_ifp == ifp) { |
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| 543 | struct in_multi *inm; |
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| 544 | |
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| 545 | for(inm = mk->mk_head.lh_first; inm; |
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| 546 | inm = inm->inm_entry.le_next) { |
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| 547 | IFAFREE(&inm->inm_ia->ia_ifa); |
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| 548 | ia->ia_ifa.ifa_refcnt++; |
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| 549 | inm->inm_ia = ia; |
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| 550 | LIST_INSERT_HEAD(&ia->ia_multiaddrs, |
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| 551 | inm, inm_entry); |
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| 552 | } |
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| 553 | LIST_REMOVE(mk, mk_entry); |
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| 554 | free(mk, M_IPMADDR); |
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| 555 | break; |
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| 556 | } |
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| 557 | } |
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| 558 | |
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| 559 | addr.s_addr = htonl(INADDR_ALLHOSTS_GROUP); |
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| 560 | in_addmulti(&addr, ifp); |
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| 561 | } |
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| 562 | return (error); |
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| 563 | } |
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| 564 | |
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| 565 | |
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| 566 | /* |
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| 567 | * Return 1 if the address might be a local broadcast address. |
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| 568 | */ |
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| 569 | int |
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[dd967330] | 570 | in_broadcast(struct in_addr in, struct ifnet *ifp) |
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[39e6e65a] | 571 | { |
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| 572 | register struct ifaddr *ifa; |
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| 573 | u_long t; |
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| 574 | |
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| 575 | if (in.s_addr == INADDR_BROADCAST || |
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| 576 | in.s_addr == INADDR_ANY) |
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| 577 | return 1; |
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| 578 | if ((ifp->if_flags & IFF_BROADCAST) == 0) |
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| 579 | return 0; |
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| 580 | t = ntohl(in.s_addr); |
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| 581 | /* |
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| 582 | * Look through the list of addresses for a match |
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| 583 | * with a broadcast address. |
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| 584 | */ |
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| 585 | #define ia ((struct in_ifaddr *)ifa) |
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| 586 | for (ifa = ifp->if_addrlist; ifa; ifa = ifa->ifa_next) |
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| 587 | if (ifa->ifa_addr->sa_family == AF_INET && |
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| 588 | (in.s_addr == ia->ia_broadaddr.sin_addr.s_addr || |
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| 589 | in.s_addr == ia->ia_netbroadcast.s_addr || |
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| 590 | /* |
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| 591 | * Check for old-style (host 0) broadcast. |
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| 592 | */ |
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| 593 | t == ia->ia_subnet || t == ia->ia_net) && |
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| 594 | /* |
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| 595 | * Check for an all one subnetmask. These |
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| 596 | * only exist when an interface gets a secondary |
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| 597 | * address. |
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| 598 | */ |
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| 599 | ia->ia_subnetmask != (u_long)0xffffffff) |
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| 600 | return 1; |
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| 601 | return (0); |
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| 602 | #undef ia |
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| 603 | } |
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| 604 | /* |
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| 605 | * Add an address to the list of IP multicast addresses for a given interface. |
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| 606 | */ |
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| 607 | struct in_multi * |
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[dd967330] | 608 | in_addmulti(struct in_addr *ap, struct ifnet *ifp) |
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[39e6e65a] | 609 | { |
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| 610 | register struct in_multi *inm; |
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| 611 | struct ifreq ifr; |
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| 612 | struct in_ifaddr *ia; |
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| 613 | int s = splnet(); |
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| 614 | |
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| 615 | /* |
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| 616 | * See if address already in list. |
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| 617 | */ |
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| 618 | IN_LOOKUP_MULTI(*ap, ifp, inm); |
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| 619 | if (inm != NULL) { |
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| 620 | /* |
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| 621 | * Found it; just increment the reference count. |
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| 622 | */ |
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| 623 | ++inm->inm_refcount; |
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| 624 | } |
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| 625 | else { |
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| 626 | /* |
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| 627 | * New address; allocate a new multicast record |
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| 628 | * and link it into the interface's multicast list. |
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| 629 | */ |
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| 630 | inm = (struct in_multi *)malloc(sizeof(*inm), |
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| 631 | M_IPMADDR, M_NOWAIT); |
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| 632 | if (inm == NULL) { |
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| 633 | splx(s); |
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| 634 | return (NULL); |
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| 635 | } |
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| 636 | inm->inm_addr = *ap; |
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| 637 | inm->inm_ifp = ifp; |
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| 638 | inm->inm_refcount = 1; |
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| 639 | IFP_TO_IA(ifp, ia); |
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| 640 | if (ia == NULL) { |
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| 641 | free(inm, M_IPMADDR); |
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| 642 | splx(s); |
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| 643 | return (NULL); |
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| 644 | } |
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| 645 | inm->inm_ia = ia; |
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| 646 | ia->ia_ifa.ifa_refcnt++; /* gain a reference */ |
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| 647 | LIST_INSERT_HEAD(&ia->ia_multiaddrs, inm, inm_entry); |
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| 648 | |
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| 649 | /* |
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| 650 | * Ask the network driver to update its multicast reception |
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| 651 | * filter appropriately for the new address. |
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| 652 | */ |
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| 653 | ((struct sockaddr_in *)&ifr.ifr_addr)->sin_family = AF_INET; |
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| 654 | ((struct sockaddr_in *)&ifr.ifr_addr)->sin_addr = *ap; |
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| 655 | if ((ifp->if_ioctl == NULL) || |
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| 656 | (*ifp->if_ioctl)(ifp, SIOCADDMULTI,(caddr_t)&ifr) != 0) { |
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| 657 | LIST_REMOVE(inm, inm_entry); |
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| 658 | IFAFREE(&ia->ia_ifa); /* release reference */ |
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| 659 | free(inm, M_IPMADDR); |
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| 660 | splx(s); |
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| 661 | return (NULL); |
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| 662 | } |
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| 663 | /* |
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| 664 | * Let IGMP know that we have joined a new IP multicast group. |
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| 665 | */ |
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| 666 | igmp_joingroup(inm); |
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| 667 | } |
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| 668 | splx(s); |
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| 669 | return (inm); |
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| 670 | } |
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| 671 | |
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| 672 | /* |
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| 673 | * Delete a multicast address record. |
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| 674 | */ |
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| 675 | void |
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[dd967330] | 676 | in_delmulti(struct in_multi *inm) |
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[39e6e65a] | 677 | { |
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| 678 | struct ifreq ifr; |
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| 679 | int s = splnet(); |
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| 680 | |
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| 681 | if (--inm->inm_refcount == 0) { |
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| 682 | /* |
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| 683 | * No remaining claims to this record; let IGMP know that |
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| 684 | * we are leaving the multicast group. |
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| 685 | */ |
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| 686 | igmp_leavegroup(inm); |
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| 687 | /* |
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| 688 | * Unlink from list. |
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| 689 | */ |
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| 690 | LIST_REMOVE(inm, inm_entry); |
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| 691 | IFAFREE(&inm->inm_ia->ia_ifa); /* release reference */ |
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| 692 | |
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| 693 | /* |
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| 694 | * Notify the network driver to update its multicast reception |
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| 695 | * filter. |
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| 696 | */ |
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| 697 | ((struct sockaddr_in *)&(ifr.ifr_addr))->sin_family = AF_INET; |
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| 698 | ((struct sockaddr_in *)&(ifr.ifr_addr))->sin_addr = |
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| 699 | inm->inm_addr; |
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| 700 | (*inm->inm_ifp->if_ioctl)(inm->inm_ifp, SIOCDELMULTI, |
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| 701 | (caddr_t)&ifr); |
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| 702 | free(inm, M_IPMADDR); |
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| 703 | } |
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| 704 | splx(s); |
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| 705 | } |
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