[39e6e65a] | 1 | /* |
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| 2 | * Copyright (c) 1982, 1986, 1988, 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 | * @(#)raw_ip.c 8.7 (Berkeley) 5/15/95 |
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[4c92297a] | 30 | * $FreeBSD: src/sys/netinet/raw_ip.c,v 1.147 2005/01/07 01:45:45 imp Exp $ |
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| 31 | */ |
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| 32 | |
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| 33 | /* |
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[39e6e65a] | 34 | * $Id$ |
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| 35 | */ |
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[4c92297a] | 36 | |
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| 37 | #include "opt_inet6.h" |
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| 38 | #include "opt_ipsec.h" |
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| 39 | #include "opt_mac.h" |
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[39e6e65a] | 40 | |
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| 41 | #include <sys/param.h> |
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[c301570] | 42 | #include <rtems/bsd/sys/queue.h> |
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[39e6e65a] | 43 | #include <sys/malloc.h> |
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| 44 | #include <sys/mbuf.h> |
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| 45 | #include <sys/socket.h> |
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| 46 | #include <sys/protosw.h> |
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| 47 | #include <sys/socketvar.h> |
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[b3f8c9e1] | 48 | #include <errno.h> |
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[39e6e65a] | 49 | #include <sys/systm.h> |
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| 50 | |
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| 51 | #include <net/if.h> |
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| 52 | #include <net/route.h> |
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| 53 | |
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| 54 | #define _IP_VHL |
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| 55 | #include <netinet/in.h> |
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| 56 | #include <netinet/in_systm.h> |
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| 57 | #include <netinet/in_pcb.h> |
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| 58 | #include <netinet/in_var.h> |
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[7ff51b00] | 59 | #include <netinet/ip.h> |
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[39e6e65a] | 60 | #include <netinet/ip_var.h> |
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| 61 | #include <netinet/ip_mroute.h> |
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| 62 | |
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| 63 | #include <netinet/ip_fw.h> |
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| 64 | |
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| 65 | #if !defined(COMPAT_IPFW) || COMPAT_IPFW == 1 |
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| 66 | #undef COMPAT_IPFW |
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| 67 | #define COMPAT_IPFW 1 |
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| 68 | #else |
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| 69 | #undef COMPAT_IPFW |
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| 70 | #endif |
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| 71 | |
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| 72 | static struct inpcbhead ripcb; |
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| 73 | static struct inpcbinfo ripcbinfo; |
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| 74 | |
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| 75 | /* |
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| 76 | * Nominal space allocated to a raw ip socket. |
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| 77 | */ |
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| 78 | #define RIPSNDQ 8192 |
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| 79 | #define RIPRCVQ 8192 |
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| 80 | |
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| 81 | /* |
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| 82 | * Raw interface to IP protocol. |
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| 83 | */ |
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| 84 | |
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| 85 | /* |
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| 86 | * Initialize raw connection block q. |
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| 87 | */ |
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| 88 | void |
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[dd967330] | 89 | rip_init(void) |
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[39e6e65a] | 90 | { |
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| 91 | LIST_INIT(&ripcb); |
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| 92 | ripcbinfo.listhead = &ripcb; |
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| 93 | /* |
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| 94 | * XXX We don't use the hash list for raw IP, but it's easier |
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| 95 | * to allocate a one entry hash list than it is to check all |
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| 96 | * over the place for hashbase == NULL. |
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| 97 | */ |
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| 98 | ripcbinfo.hashbase = hashinit(1, M_PCB, &ripcbinfo.hashmask); |
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| 99 | } |
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| 100 | |
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| 101 | static struct sockaddr_in ripsrc = { sizeof(ripsrc), AF_INET }; |
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| 102 | /* |
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| 103 | * Setup generic address and protocol structures |
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| 104 | * for raw_input routine, then pass them along with |
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| 105 | * mbuf chain. |
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| 106 | */ |
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| 107 | void |
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[4c92297a] | 108 | rip_input(struct mbuf *m, int iphlen) |
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[39e6e65a] | 109 | { |
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[4c92297a] | 110 | struct ip *ip = mtod(m, struct ip *); |
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[39e6e65a] | 111 | register struct inpcb *inp; |
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| 112 | struct inpcb *last = 0; |
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| 113 | struct mbuf *opts = 0; |
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| 114 | |
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| 115 | ripsrc.sin_addr = ip->ip_src; |
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| 116 | for (inp = ripcb.lh_first; inp != NULL; inp = inp->inp_list.le_next) { |
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| 117 | if (inp->inp_ip_p && inp->inp_ip_p != ip->ip_p) |
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| 118 | continue; |
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| 119 | if (inp->inp_laddr.s_addr && |
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| 120 | inp->inp_laddr.s_addr != ip->ip_dst.s_addr) |
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| 121 | continue; |
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| 122 | if (inp->inp_faddr.s_addr && |
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| 123 | inp->inp_faddr.s_addr != ip->ip_src.s_addr) |
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| 124 | continue; |
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| 125 | if (last) { |
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| 126 | struct mbuf *n = m_copy(m, 0, (int)M_COPYALL); |
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| 127 | if (n) { |
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| 128 | if (last->inp_flags & INP_CONTROLOPTS || |
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| 129 | last->inp_socket->so_options & SO_TIMESTAMP) |
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| 130 | ip_savecontrol(last, &opts, ip, n); |
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| 131 | if (sbappendaddr(&last->inp_socket->so_rcv, |
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| 132 | (struct sockaddr *)&ripsrc, n, |
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| 133 | opts) == 0) { |
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| 134 | /* should notify about lost packet */ |
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| 135 | m_freem(n); |
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| 136 | if (opts) |
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| 137 | m_freem(opts); |
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| 138 | } else |
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| 139 | sorwakeup(last->inp_socket); |
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| 140 | opts = 0; |
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| 141 | } |
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| 142 | } |
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| 143 | last = inp; |
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| 144 | } |
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| 145 | if (last) { |
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| 146 | if (last->inp_flags & INP_CONTROLOPTS || |
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| 147 | last->inp_socket->so_options & SO_TIMESTAMP) |
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| 148 | ip_savecontrol(last, &opts, ip, m); |
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| 149 | if (sbappendaddr(&last->inp_socket->so_rcv, |
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| 150 | (struct sockaddr *)&ripsrc, m, opts) == 0) { |
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| 151 | m_freem(m); |
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| 152 | if (opts) |
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| 153 | m_freem(opts); |
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| 154 | } else |
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| 155 | sorwakeup(last->inp_socket); |
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| 156 | } else { |
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| 157 | m_freem(m); |
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| 158 | ipstat.ips_noproto++; |
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| 159 | ipstat.ips_delivered--; |
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| 160 | } |
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| 161 | } |
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| 162 | |
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| 163 | /* |
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| 164 | * Generate IP header and pass packet to ip_output. |
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| 165 | * Tack on options user may have setup with control call. |
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| 166 | */ |
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| 167 | int |
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[4c92297a] | 168 | rip_output(struct mbuf *m, struct socket *so, u_long dst) |
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[39e6e65a] | 169 | { |
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[4c92297a] | 170 | struct ip *ip; |
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| 171 | struct inpcb *inp = sotoinpcb(so); |
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| 172 | int flags = ((so->so_options & SO_DONTROUTE) ? IP_ROUTETOIF : 0) | |
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| 173 | IP_ALLOWBROADCAST; |
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[39e6e65a] | 174 | |
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| 175 | /* |
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| 176 | * If the user handed us a complete IP packet, use it. |
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| 177 | * Otherwise, allocate an mbuf for a header and fill it in. |
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| 178 | */ |
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| 179 | if ((inp->inp_flags & INP_HDRINCL) == 0) { |
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| 180 | if (m->m_pkthdr.len + sizeof(struct ip) > IP_MAXPACKET) { |
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| 181 | m_freem(m); |
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| 182 | return(EMSGSIZE); |
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| 183 | } |
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| 184 | M_PREPEND(m, sizeof(struct ip), M_WAIT); |
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| 185 | ip = mtod(m, struct ip *); |
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| 186 | ip->ip_tos = 0; |
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| 187 | ip->ip_off = 0; |
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| 188 | ip->ip_p = inp->inp_ip_p; |
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| 189 | ip->ip_len = m->m_pkthdr.len; |
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| 190 | ip->ip_src = inp->inp_laddr; |
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| 191 | ip->ip_dst.s_addr = dst; |
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| 192 | ip->ip_ttl = MAXTTL; |
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| 193 | } else { |
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| 194 | if (m->m_pkthdr.len > IP_MAXPACKET) { |
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| 195 | m_freem(m); |
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| 196 | return(EMSGSIZE); |
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| 197 | } |
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| 198 | ip = mtod(m, struct ip *); |
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| 199 | /* don't allow both user specified and setsockopt options, |
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| 200 | and don't allow packet length sizes that will crash */ |
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[7ff51b00] | 201 | #ifdef _IP_VHL |
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[39e6e65a] | 202 | if (((IP_VHL_HL(ip->ip_vhl) != (sizeof (*ip) >> 2)) |
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| 203 | && inp->inp_options) |
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| 204 | || (ip->ip_len > m->m_pkthdr.len) |
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| 205 | || (ip->ip_len < (IP_VHL_HL(ip->ip_vhl) << 2))) { |
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[7ff51b00] | 206 | #else |
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| 207 | if (((ip->ip_hl != (sizeof (*ip) >> 2)) |
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| 208 | && inp->inp_options) |
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| 209 | || (ip->ip_len > m->m_pkthdr.len) |
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| 210 | || (ip->ip_len < (ip->ip_hl << 2))) { |
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| 211 | #endif |
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[39e6e65a] | 212 | m_freem(m); |
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| 213 | return EINVAL; |
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| 214 | } |
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| 215 | if (ip->ip_id == 0) |
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| 216 | ip->ip_id = htons(ip_id++); |
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| 217 | /* XXX prevent ip_output from overwriting header fields */ |
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| 218 | flags |= IP_RAWOUTPUT; |
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| 219 | ipstat.ips_rawout++; |
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| 220 | } |
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| 221 | return (ip_output(m, inp->inp_options, &inp->inp_route, flags, |
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| 222 | inp->inp_moptions)); |
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| 223 | } |
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| 224 | |
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| 225 | /* |
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| 226 | * Raw IP socket option processing. |
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| 227 | */ |
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| 228 | int |
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[dd967330] | 229 | rip_ctloutput(int op, struct socket *so, int level, int optname, |
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| 230 | struct mbuf **m) |
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[39e6e65a] | 231 | { |
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[4c92297a] | 232 | struct inpcb *inp = sotoinpcb(so); |
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| 233 | int error; |
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[39e6e65a] | 234 | |
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| 235 | if (level != IPPROTO_IP) { |
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| 236 | if (op == PRCO_SETOPT && *m) |
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| 237 | (void)m_free(*m); |
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| 238 | return (EINVAL); |
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| 239 | } |
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| 240 | |
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| 241 | switch (optname) { |
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| 242 | |
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| 243 | case IP_HDRINCL: |
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| 244 | error = 0; |
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| 245 | if (op == PRCO_SETOPT) { |
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| 246 | if (m == 0 || *m == 0 || (*m)->m_len < sizeof (int)) |
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| 247 | error = EINVAL; |
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| 248 | else if (*mtod(*m, int *)) |
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| 249 | inp->inp_flags |= INP_HDRINCL; |
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| 250 | else |
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| 251 | inp->inp_flags &= ~INP_HDRINCL; |
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| 252 | if (*m) |
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| 253 | (void)m_free(*m); |
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| 254 | } else { |
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| 255 | *m = m_get(M_WAIT, MT_SOOPTS); |
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| 256 | (*m)->m_len = sizeof (int); |
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| 257 | *mtod(*m, int *) = inp->inp_flags & INP_HDRINCL; |
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| 258 | } |
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| 259 | return (error); |
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| 260 | |
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| 261 | #ifdef COMPAT_IPFW |
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| 262 | case IP_FW_GET: |
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| 263 | if (ip_fw_ctl_ptr == NULL || op == PRCO_SETOPT) { |
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| 264 | if (*m) (void)m_free(*m); |
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| 265 | return(EINVAL); |
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| 266 | } |
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| 267 | return (*ip_fw_ctl_ptr)(optname, m); |
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| 268 | |
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| 269 | case IP_FW_ADD: |
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| 270 | case IP_FW_DEL: |
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| 271 | case IP_FW_FLUSH: |
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| 272 | case IP_FW_ZERO: |
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| 273 | if (ip_fw_ctl_ptr == NULL || op != PRCO_SETOPT) { |
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| 274 | if (*m) (void)m_free(*m); |
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| 275 | return(EINVAL); |
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| 276 | } |
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| 277 | return (*ip_fw_ctl_ptr)(optname, m); |
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| 278 | |
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| 279 | case IP_NAT: |
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| 280 | if (ip_nat_ctl_ptr == NULL) { |
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| 281 | if (*m) (void)m_free(*m); |
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| 282 | return(EINVAL); |
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| 283 | } |
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| 284 | return (*ip_nat_ctl_ptr)(op, m); |
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| 285 | |
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| 286 | #endif |
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| 287 | case IP_RSVP_ON: |
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| 288 | return ip_rsvp_init(so); |
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| 289 | break; |
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| 290 | |
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| 291 | case IP_RSVP_OFF: |
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| 292 | return ip_rsvp_done(); |
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| 293 | break; |
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| 294 | |
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| 295 | case IP_RSVP_VIF_ON: |
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| 296 | return ip_rsvp_vif_init(so, *m); |
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| 297 | |
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| 298 | case IP_RSVP_VIF_OFF: |
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| 299 | return ip_rsvp_vif_done(so, *m); |
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| 300 | |
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| 301 | case MRT_INIT: |
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| 302 | case MRT_DONE: |
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| 303 | case MRT_ADD_VIF: |
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| 304 | case MRT_DEL_VIF: |
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| 305 | case MRT_ADD_MFC: |
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| 306 | case MRT_DEL_MFC: |
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| 307 | case MRT_VERSION: |
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| 308 | case MRT_ASSERT: |
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| 309 | if (op == PRCO_SETOPT) { |
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| 310 | error = ip_mrouter_set(optname, so, *m); |
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| 311 | if (*m) |
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| 312 | (void)m_free(*m); |
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| 313 | } else if (op == PRCO_GETOPT) { |
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| 314 | error = ip_mrouter_get(optname, so, m); |
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| 315 | } else |
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| 316 | error = EINVAL; |
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| 317 | return (error); |
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| 318 | } |
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| 319 | return (ip_ctloutput(op, so, level, optname, m)); |
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| 320 | } |
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| 321 | |
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| 322 | static u_long rip_sendspace = RIPSNDQ; /* XXX sysctl ? */ |
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| 323 | static u_long rip_recvspace = RIPRCVQ; /* XXX sysctl ? */ |
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| 324 | |
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| 325 | /*ARGSUSED*/ |
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| 326 | int |
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[dd967330] | 327 | rip_usrreq(struct socket *so, int req, struct mbuf *m, struct mbuf *nam, |
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| 328 | struct mbuf *control) |
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[39e6e65a] | 329 | { |
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| 330 | register int error = 0; |
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| 331 | register struct inpcb *inp = sotoinpcb(so); |
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| 332 | int s; |
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| 333 | |
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| 334 | if (req == PRU_CONTROL) |
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| 335 | return (in_control(so, (u_long)m, (caddr_t)nam, |
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| 336 | (struct ifnet *)control)); |
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| 337 | |
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| 338 | switch (req) { |
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| 339 | |
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| 340 | case PRU_ATTACH: |
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| 341 | if (inp) |
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| 342 | panic("rip_attach"); |
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| 343 | if ((so->so_state & SS_PRIV) == 0) { |
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| 344 | error = EACCES; |
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| 345 | break; |
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| 346 | } |
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| 347 | s = splnet(); |
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| 348 | error = in_pcballoc(so, &ripcbinfo); |
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| 349 | splx(s); |
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| 350 | if (error) |
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| 351 | break; |
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| 352 | error = soreserve(so, rip_sendspace, rip_recvspace); |
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| 353 | if (error) |
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| 354 | break; |
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| 355 | inp = (struct inpcb *)so->so_pcb; |
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| 356 | inp->inp_ip_p = (int)nam; |
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| 357 | break; |
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| 358 | |
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| 359 | case PRU_DISCONNECT: |
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| 360 | if ((so->so_state & SS_ISCONNECTED) == 0) { |
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| 361 | error = ENOTCONN; |
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| 362 | break; |
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| 363 | } |
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| 364 | /* FALLTHROUGH */ |
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| 365 | case PRU_ABORT: |
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| 366 | soisdisconnected(so); |
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| 367 | /* FALLTHROUGH */ |
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| 368 | case PRU_DETACH: |
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| 369 | if (inp == 0) |
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| 370 | panic("rip_detach"); |
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| 371 | if (so == ip_mrouter) |
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| 372 | ip_mrouter_done(); |
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| 373 | ip_rsvp_force_done(so); |
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| 374 | if (so == ip_rsvpd) |
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| 375 | ip_rsvp_done(); |
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| 376 | in_pcbdetach(inp); |
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| 377 | break; |
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| 378 | |
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| 379 | case PRU_BIND: |
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| 380 | { |
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| 381 | struct sockaddr_in *addr = mtod(nam, struct sockaddr_in *); |
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| 382 | |
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| 383 | if (nam->m_len != sizeof(*addr)) { |
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| 384 | error = EINVAL; |
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| 385 | break; |
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| 386 | } |
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| 387 | if ((ifnet == 0) || |
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| 388 | ((addr->sin_family != AF_INET) && |
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| 389 | (addr->sin_family != AF_IMPLINK)) || |
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| 390 | (addr->sin_addr.s_addr && |
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| 391 | ifa_ifwithaddr((struct sockaddr *)addr) == 0)) { |
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| 392 | error = EADDRNOTAVAIL; |
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| 393 | break; |
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| 394 | } |
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| 395 | inp->inp_laddr = addr->sin_addr; |
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| 396 | break; |
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| 397 | } |
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| 398 | case PRU_CONNECT: |
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| 399 | { |
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| 400 | struct sockaddr_in *addr = mtod(nam, struct sockaddr_in *); |
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| 401 | |
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| 402 | if (nam->m_len != sizeof(*addr)) { |
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| 403 | error = EINVAL; |
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| 404 | break; |
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| 405 | } |
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| 406 | if (ifnet == 0) { |
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| 407 | error = EADDRNOTAVAIL; |
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| 408 | break; |
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| 409 | } |
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| 410 | if ((addr->sin_family != AF_INET) && |
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| 411 | (addr->sin_family != AF_IMPLINK)) { |
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| 412 | error = EAFNOSUPPORT; |
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| 413 | break; |
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| 414 | } |
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| 415 | inp->inp_faddr = addr->sin_addr; |
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| 416 | soisconnected(so); |
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| 417 | break; |
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| 418 | } |
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| 419 | |
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| 420 | case PRU_CONNECT2: |
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| 421 | error = EOPNOTSUPP; |
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| 422 | break; |
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| 423 | |
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| 424 | /* |
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| 425 | * Mark the connection as being incapable of further input. |
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| 426 | */ |
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| 427 | case PRU_SHUTDOWN: |
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| 428 | socantsendmore(so); |
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| 429 | break; |
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| 430 | |
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| 431 | /* |
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| 432 | * Ship a packet out. The appropriate raw output |
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| 433 | * routine handles any massaging necessary. |
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| 434 | */ |
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| 435 | case PRU_SEND: |
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| 436 | { |
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| 437 | register u_long dst; |
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| 438 | |
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| 439 | if (so->so_state & SS_ISCONNECTED) { |
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| 440 | if (nam) { |
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| 441 | error = EISCONN; |
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| 442 | break; |
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| 443 | } |
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| 444 | dst = inp->inp_faddr.s_addr; |
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| 445 | } else { |
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| 446 | if (nam == NULL) { |
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| 447 | error = ENOTCONN; |
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| 448 | break; |
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| 449 | } |
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| 450 | dst = mtod(nam, struct sockaddr_in *)->sin_addr.s_addr; |
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| 451 | } |
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| 452 | error = rip_output(m, so, dst); |
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| 453 | m = NULL; |
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| 454 | break; |
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| 455 | } |
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| 456 | |
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| 457 | case PRU_SENSE: |
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| 458 | /* |
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| 459 | * stat: don't bother with a blocksize. |
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| 460 | */ |
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| 461 | return (0); |
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| 462 | |
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| 463 | /* |
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| 464 | * Not supported. |
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| 465 | */ |
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| 466 | case PRU_RCVOOB: |
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| 467 | case PRU_RCVD: |
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| 468 | case PRU_LISTEN: |
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| 469 | case PRU_ACCEPT: |
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| 470 | case PRU_SENDOOB: |
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| 471 | error = EOPNOTSUPP; |
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| 472 | break; |
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| 473 | |
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| 474 | case PRU_SOCKADDR: |
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| 475 | in_setsockaddr(inp, nam); |
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| 476 | break; |
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| 477 | |
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| 478 | case PRU_PEERADDR: |
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| 479 | in_setpeeraddr(inp, nam); |
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| 480 | break; |
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| 481 | |
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| 482 | default: |
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| 483 | panic("rip_usrreq"); |
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| 484 | } |
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| 485 | if (m != NULL) |
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| 486 | m_freem(m); |
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| 487 | return (error); |
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| 488 | } |
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