| 1 |
/* |
| 2 |
* Copyright (c) 1982, 1986, 1988, 1993 |
| 3 |
* The Regents of the University of California. All rights reserved. |
| 4 |
* |
| 5 |
* Redistribution and use in source and binary forms, with or without |
| 6 |
* modification, are permitted provided that the following conditions |
| 7 |
* are met: |
| 8 |
* 1. Redistributions of source code must retain the above copyright |
| 9 |
* notice, this list of conditions and the following disclaimer. |
| 10 |
* 2. Redistributions in binary form must reproduce the above copyright |
| 11 |
* notice, this list of conditions and the following disclaimer in the |
| 12 |
* documentation and/or other materials provided with the distribution. |
| 13 |
* 3. All advertising materials mentioning features or use of this software |
| 14 |
* must display the following acknowledgement: |
| 15 |
* This product includes software developed by the University of |
| 16 |
* California, Berkeley and its contributors. |
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* 4. Neither the name of the University nor the names of its contributors |
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* may be used to endorse or promote products derived from this software |
| 19 |
* without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| 22 |
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 23 |
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 24 |
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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* SUCH DAMAGE. |
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* |
| 33 |
* @(#)raw_ip.c 8.7 (Berkeley) 5/15/95 |
| 34 |
* $Id$ |
| 35 |
*/ |
| 36 |
|
| 37 |
#include <sys/param.h> |
| 38 |
#include <sys/queue.h> |
| 39 |
#include <sys/malloc.h> |
| 40 |
#include <sys/mbuf.h> |
| 41 |
#include <sys/socket.h> |
| 42 |
#include <sys/protosw.h> |
| 43 |
#include <sys/socketvar.h> |
| 44 |
#include <sys/errno.h> |
| 45 |
#include <sys/systm.h> |
| 46 |
|
| 47 |
#include <net/if.h> |
| 48 |
#include <net/route.h> |
| 49 |
|
| 50 |
#define _IP_VHL |
| 51 |
#include <netinet/in.h> |
| 52 |
#include <netinet/in_systm.h> |
| 53 |
#include <netinet/ip.h> |
| 54 |
#include <netinet/in_pcb.h> |
| 55 |
#include <netinet/in_var.h> |
| 56 |
#include <netinet/ip_var.h> |
| 57 |
#include <netinet/ip_mroute.h> |
| 58 |
|
| 59 |
#include <netinet/ip_fw.h> |
| 60 |
|
| 61 |
#if !defined(COMPAT_IPFW) || COMPAT_IPFW == 1 |
| 62 |
#undef COMPAT_IPFW |
| 63 |
#define COMPAT_IPFW 1 |
| 64 |
#else |
| 65 |
#undef COMPAT_IPFW |
| 66 |
#endif |
| 67 |
|
| 68 |
static struct inpcbhead ripcb; |
| 69 |
static struct inpcbinfo ripcbinfo; |
| 70 |
|
| 71 |
/* |
| 72 |
* Nominal space allocated to a raw ip socket. |
| 73 |
*/ |
| 74 |
#define RIPSNDQ 8192 |
| 75 |
#define RIPRCVQ 8192 |
| 76 |
|
| 77 |
/* |
| 78 |
* Raw interface to IP protocol. |
| 79 |
*/ |
| 80 |
|
| 81 |
/* |
| 82 |
* Initialize raw connection block q. |
| 83 |
*/ |
| 84 |
void |
| 85 |
rip_init() |
| 86 |
{ |
| 87 |
LIST_INIT(&ripcb); |
| 88 |
ripcbinfo.listhead = &ripcb; |
| 89 |
/* |
| 90 |
* XXX We don't use the hash list for raw IP, but it's easier |
| 91 |
* to allocate a one entry hash list than it is to check all |
| 92 |
* over the place for hashbase == NULL. |
| 93 |
*/ |
| 94 |
ripcbinfo.hashbase = phashinit(1, M_PCB, &ripcbinfo.hashsize); |
| 95 |
} |
| 96 |
|
| 97 |
static struct sockaddr_in ripsrc = { sizeof(ripsrc), AF_INET }; |
| 98 |
/* |
| 99 |
* Setup generic address and protocol structures |
| 100 |
* for raw_input routine, then pass them along with |
| 101 |
* mbuf chain. |
| 102 |
*/ |
| 103 |
void |
| 104 |
rip_input(m, iphlen) |
| 105 |
struct mbuf *m; |
| 106 |
int iphlen; |
| 107 |
{ |
| 108 |
register struct ip *ip = mtod(m, struct ip *); |
| 109 |
register struct inpcb *inp; |
| 110 |
struct inpcb *last = 0; |
| 111 |
struct mbuf *opts = 0; |
| 112 |
|
| 113 |
ripsrc.sin_addr = ip->ip_src; |
| 114 |
for (inp = ripcb.lh_first; inp != NULL; inp = inp->inp_list.le_next) { |
| 115 |
if (inp->inp_ip.ip_p && inp->inp_ip.ip_p != ip->ip_p) |
| 116 |
continue; |
| 117 |
if (inp->inp_laddr.s_addr && |
| 118 |
inp->inp_laddr.s_addr != ip->ip_dst.s_addr) |
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continue; |
| 120 |
if (inp->inp_faddr.s_addr && |
| 121 |
inp->inp_faddr.s_addr != ip->ip_src.s_addr) |
| 122 |
continue; |
| 123 |
if (last) { |
| 124 |
struct mbuf *n = m_copy(m, 0, (int)M_COPYALL); |
| 125 |
if (n) { |
| 126 |
if (last->inp_flags & INP_CONTROLOPTS || |
| 127 |
last->inp_socket->so_options & SO_TIMESTAMP) |
| 128 |
ip_savecontrol(last, &opts, ip, n); |
| 129 |
if (sbappendaddr(&last->inp_socket->so_rcv, |
| 130 |
(struct sockaddr *)&ripsrc, n, |
| 131 |
opts) == 0) { |
| 132 |
/* should notify about lost packet */ |
| 133 |
m_freem(n); |
| 134 |
if (opts) |
| 135 |
m_freem(opts); |
| 136 |
} else |
| 137 |
sorwakeup(last->inp_socket); |
| 138 |
opts = 0; |
| 139 |
} |
| 140 |
} |
| 141 |
last = inp; |
| 142 |
} |
| 143 |
if (last) { |
| 144 |
if (last->inp_flags & INP_CONTROLOPTS || |
| 145 |
last->inp_socket->so_options & SO_TIMESTAMP) |
| 146 |
ip_savecontrol(last, &opts, ip, m); |
| 147 |
if (sbappendaddr(&last->inp_socket->so_rcv, |
| 148 |
(struct sockaddr *)&ripsrc, m, opts) == 0) { |
| 149 |
m_freem(m); |
| 150 |
if (opts) |
| 151 |
m_freem(opts); |
| 152 |
} else |
| 153 |
sorwakeup(last->inp_socket); |
| 154 |
} else { |
| 155 |
m_freem(m); |
| 156 |
ipstat.ips_noproto++; |
| 157 |
ipstat.ips_delivered--; |
| 158 |
} |
| 159 |
} |
| 160 |
|
| 161 |
/* |
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* Generate IP header and pass packet to ip_output. |
| 163 |
* Tack on options user may have setup with control call. |
| 164 |
*/ |
| 165 |
int |
| 166 |
rip_output(m, so, dst) |
| 167 |
register struct mbuf *m; |
| 168 |
struct socket *so; |
| 169 |
u_long dst; |
| 170 |
{ |
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register struct ip *ip; |
| 172 |
register struct inpcb *inp = sotoinpcb(so); |
| 173 |
int flags = (so->so_options & SO_DONTROUTE) | IP_ALLOWBROADCAST; |
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|
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/* |
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* If the user handed us a complete IP packet, use it. |
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* Otherwise, allocate an mbuf for a header and fill it in. |
| 178 |
*/ |
| 179 |
if ((inp->inp_flags & INP_HDRINCL) == 0) { |
| 180 |
if (m->m_pkthdr.len + sizeof(struct ip) > IP_MAXPACKET) { |
| 181 |
m_freem(m); |
| 182 |
return(EMSGSIZE); |
| 183 |
} |
| 184 |
M_PREPEND(m, sizeof(struct ip), M_WAIT); |
| 185 |
ip = mtod(m, struct ip *); |
| 186 |
ip->ip_tos = 0; |
| 187 |
ip->ip_off = 0; |
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ip->ip_p = inp->inp_ip.ip_p; |
| 189 |
ip->ip_len = m->m_pkthdr.len; |
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ip->ip_src = inp->inp_laddr; |
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ip->ip_dst.s_addr = dst; |
| 192 |
ip->ip_ttl = MAXTTL; |
| 193 |
} else { |
| 194 |
if (m->m_pkthdr.len > IP_MAXPACKET) { |
| 195 |
m_freem(m); |
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return(EMSGSIZE); |
| 197 |
} |
| 198 |
ip = mtod(m, struct ip *); |
| 199 |
/* don't allow both user specified and setsockopt options, |
| 200 |
and don't allow packet length sizes that will crash */ |
| 201 |
if (((IP_VHL_HL(ip->ip_vhl) != (sizeof (*ip) >> 2)) |
| 202 |
&& inp->inp_options) |
| 203 |
|| (ip->ip_len > m->m_pkthdr.len)) { |
| 204 |
m_freem(m); |
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return EINVAL; |
| 206 |
} |
| 207 |
if (ip->ip_id == 0) |
| 208 |
ip->ip_id = htons(ip_id++); |
| 209 |
/* XXX prevent ip_output from overwriting header fields */ |
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flags |= IP_RAWOUTPUT; |
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ipstat.ips_rawout++; |
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} |
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return (ip_output(m, inp->inp_options, &inp->inp_route, flags, |
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inp->inp_moptions)); |
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} |
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|
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/* |
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* Raw IP socket option processing. |
| 219 |
*/ |
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int |
| 221 |
rip_ctloutput(op, so, level, optname, m) |
| 222 |
int op; |
| 223 |
struct socket *so; |
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int level, optname; |
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struct mbuf **m; |
| 226 |
{ |
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register struct inpcb *inp = sotoinpcb(so); |
| 228 |
register int error; |
| 229 |
|
| 230 |
if (level != IPPROTO_IP) { |
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if (op == PRCO_SETOPT && *m) |
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(void)m_free(*m); |
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return (EINVAL); |
| 234 |
} |
| 235 |
|
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switch (optname) { |
| 237 |
|
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case IP_HDRINCL: |
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error = 0; |
| 240 |
if (op == PRCO_SETOPT) { |
| 241 |
if (m == 0 || *m == 0 || (*m)->m_len < sizeof (int)) |
| 242 |
error = EINVAL; |
| 243 |
else if (*mtod(*m, int *)) |
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inp->inp_flags |= INP_HDRINCL; |
| 245 |
else |
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inp->inp_flags &= ~INP_HDRINCL; |
| 247 |
if (*m) |
| 248 |
(void)m_free(*m); |
| 249 |
} else { |
| 250 |
*m = m_get(M_WAIT, MT_SOOPTS); |
| 251 |
(*m)->m_len = sizeof (int); |
| 252 |
*mtod(*m, int *) = inp->inp_flags & INP_HDRINCL; |
| 253 |
} |
| 254 |
return (error); |
| 255 |
|
| 256 |
#ifdef COMPAT_IPFW |
| 257 |
case IP_FW_GET: |
| 258 |
if (ip_fw_ctl_ptr == NULL || op == PRCO_SETOPT) { |
| 259 |
if (*m) (void)m_free(*m); |
| 260 |
return(EINVAL); |
| 261 |
} |
| 262 |
return (*ip_fw_ctl_ptr)(optname, m); |
| 263 |
|
| 264 |
case IP_FW_ADD: |
| 265 |
case IP_FW_DEL: |
| 266 |
case IP_FW_FLUSH: |
| 267 |
case IP_FW_ZERO: |
| 268 |
if (ip_fw_ctl_ptr == NULL || op != PRCO_SETOPT) { |
| 269 |
if (*m) (void)m_free(*m); |
| 270 |
return(EINVAL); |
| 271 |
} |
| 272 |
return (*ip_fw_ctl_ptr)(optname, m); |
| 273 |
|
| 274 |
case IP_NAT: |
| 275 |
if (ip_nat_ctl_ptr == NULL) { |
| 276 |
if (*m) (void)m_free(*m); |
| 277 |
return(EINVAL); |
| 278 |
} |
| 279 |
return (*ip_nat_ctl_ptr)(op, m); |
| 280 |
|
| 281 |
#endif |
| 282 |
case IP_RSVP_ON: |
| 283 |
return ip_rsvp_init(so); |
| 284 |
break; |
| 285 |
|
| 286 |
case IP_RSVP_OFF: |
| 287 |
return ip_rsvp_done(); |
| 288 |
break; |
| 289 |
|
| 290 |
case IP_RSVP_VIF_ON: |
| 291 |
return ip_rsvp_vif_init(so, *m); |
| 292 |
|
| 293 |
case IP_RSVP_VIF_OFF: |
| 294 |
return ip_rsvp_vif_done(so, *m); |
| 295 |
|
| 296 |
case MRT_INIT: |
| 297 |
case MRT_DONE: |
| 298 |
case MRT_ADD_VIF: |
| 299 |
case MRT_DEL_VIF: |
| 300 |
case MRT_ADD_MFC: |
| 301 |
case MRT_DEL_MFC: |
| 302 |
case MRT_VERSION: |
| 303 |
case MRT_ASSERT: |
| 304 |
if (op == PRCO_SETOPT) { |
| 305 |
error = ip_mrouter_set(optname, so, *m); |
| 306 |
if (*m) |
| 307 |
(void)m_free(*m); |
| 308 |
} else if (op == PRCO_GETOPT) { |
| 309 |
error = ip_mrouter_get(optname, so, m); |
| 310 |
} else |
| 311 |
error = EINVAL; |
| 312 |
return (error); |
| 313 |
} |
| 314 |
return (ip_ctloutput(op, so, level, optname, m)); |
| 315 |
} |
| 316 |
|
| 317 |
/* |
| 318 |
* This function exists solely to receive the PRC_IFDOWN messages which |
| 319 |
* are sent by if_down(). It looks for an ifaddr whose ifa_addr is sa, |
| 320 |
* and calls in_ifadown() to remove all routes corresponding to that address. |
| 321 |
* It also receives the PRC_IFUP messages from if_up() and reinstalls the |
| 322 |
* interface routes. |
| 323 |
*/ |
| 324 |
void |
| 325 |
rip_ctlinput(cmd, sa, vip) |
| 326 |
int cmd; |
| 327 |
struct sockaddr *sa; |
| 328 |
void *vip; |
| 329 |
{ |
| 330 |
struct in_ifaddr *ia; |
| 331 |
struct ifnet *ifp; |
| 332 |
int err; |
| 333 |
int flags; |
| 334 |
|
| 335 |
switch(cmd) { |
| 336 |
case PRC_IFDOWN: |
| 337 |
for (ia = in_ifaddrhead.tqh_first; ia; |
| 338 |
ia = ia->ia_link.tqe_next) { |
| 339 |
if (ia->ia_ifa.ifa_addr == sa |
| 340 |
&& (ia->ia_flags & IFA_ROUTE)) { |
| 341 |
/* |
| 342 |
* in_ifscrub kills the interface route. |
| 343 |
*/ |
| 344 |
in_ifscrub(ia->ia_ifp, ia); |
| 345 |
/* |
| 346 |
* in_ifadown gets rid of all the rest of |
| 347 |
* the routes. This is not quite the right |
| 348 |
* thing to do, but at least if we are running |
| 349 |
* a routing process they will come back. |
| 350 |
*/ |
| 351 |
in_ifadown(&ia->ia_ifa); |
| 352 |
break; |
| 353 |
} |
| 354 |
} |
| 355 |
break; |
| 356 |
|
| 357 |
case PRC_IFUP: |
| 358 |
for (ia = in_ifaddrhead.tqh_first; ia; |
| 359 |
ia = ia->ia_link.tqe_next) { |
| 360 |
if (ia->ia_ifa.ifa_addr == sa) |
| 361 |
break; |
| 362 |
} |
| 363 |
if (ia == 0 || (ia->ia_flags & IFA_ROUTE)) |
| 364 |
return; |
| 365 |
flags = RTF_UP; |
| 366 |
ifp = ia->ia_ifa.ifa_ifp; |
| 367 |
|
| 368 |
if ((ifp->if_flags & IFF_LOOPBACK) |
| 369 |
|| (ifp->if_flags & IFF_POINTOPOINT)) |
| 370 |
flags |= RTF_HOST; |
| 371 |
|
| 372 |
err = rtinit(&ia->ia_ifa, RTM_ADD, flags); |
| 373 |
if (err == 0) |
| 374 |
ia->ia_flags |= IFA_ROUTE; |
| 375 |
break; |
| 376 |
} |
| 377 |
} |
| 378 |
|
| 379 |
static u_long rip_sendspace = RIPSNDQ; /* XXX sysctl ? */ |
| 380 |
static u_long rip_recvspace = RIPRCVQ; /* XXX sysctl ? */ |
| 381 |
|
| 382 |
/*ARGSUSED*/ |
| 383 |
int |
| 384 |
rip_usrreq(so, req, m, nam, control) |
| 385 |
register struct socket *so; |
| 386 |
int req; |
| 387 |
struct mbuf *m, *nam, *control; |
| 388 |
{ |
| 389 |
register int error = 0; |
| 390 |
register struct inpcb *inp = sotoinpcb(so); |
| 391 |
|
| 392 |
if (req == PRU_CONTROL) |
| 393 |
return (in_control(so, (u_long)m, (caddr_t)nam, |
| 394 |
(struct ifnet *)control)); |
| 395 |
|
| 396 |
switch (req) { |
| 397 |
|
| 398 |
case PRU_ATTACH: |
| 399 |
if (inp) |
| 400 |
panic("rip_attach"); |
| 401 |
if ((so->so_state & SS_PRIV) == 0) { |
| 402 |
error = EACCES; |
| 403 |
break; |
| 404 |
} |
| 405 |
if ((error = soreserve(so, rip_sendspace, rip_recvspace)) || |
| 406 |
(error = in_pcballoc(so, &ripcbinfo))) |
| 407 |
break; |
| 408 |
inp = (struct inpcb *)so->so_pcb; |
| 409 |
inp->inp_ip.ip_p = (int)nam; |
| 410 |
break; |
| 411 |
|
| 412 |
case PRU_DISCONNECT: |
| 413 |
if ((so->so_state & SS_ISCONNECTED) == 0) { |
| 414 |
error = ENOTCONN; |
| 415 |
break; |
| 416 |
} |
| 417 |
/* FALLTHROUGH */ |
| 418 |
case PRU_ABORT: |
| 419 |
soisdisconnected(so); |
| 420 |
/* FALLTHROUGH */ |
| 421 |
case PRU_DETACH: |
| 422 |
if (inp == 0) |
| 423 |
panic("rip_detach"); |
| 424 |
if (so == ip_mrouter) |
| 425 |
ip_mrouter_done(); |
| 426 |
ip_rsvp_force_done(so); |
| 427 |
if (so == ip_rsvpd) |
| 428 |
ip_rsvp_done(); |
| 429 |
in_pcbdetach(inp); |
| 430 |
break; |
| 431 |
|
| 432 |
case PRU_BIND: |
| 433 |
{ |
| 434 |
struct sockaddr_in *addr = mtod(nam, struct sockaddr_in *); |
| 435 |
|
| 436 |
if (nam->m_len != sizeof(*addr)) { |
| 437 |
error = EINVAL; |
| 438 |
break; |
| 439 |
} |
| 440 |
if (TAILQ_EMPTY(&ifnet) || |
| 441 |
((addr->sin_family != AF_INET) && |
| 442 |
(addr->sin_family != AF_IMPLINK)) || |
| 443 |
(addr->sin_addr.s_addr && |
| 444 |
ifa_ifwithaddr((struct sockaddr *)addr) == 0)) { |
| 445 |
error = EADDRNOTAVAIL; |
| 446 |
break; |
| 447 |
} |
| 448 |
inp->inp_laddr = addr->sin_addr; |
| 449 |
break; |
| 450 |
} |
| 451 |
case PRU_CONNECT: |
| 452 |
{ |
| 453 |
struct sockaddr_in *addr = mtod(nam, struct sockaddr_in *); |
| 454 |
|
| 455 |
if (nam->m_len != sizeof(*addr)) { |
| 456 |
error = EINVAL; |
| 457 |
break; |
| 458 |
} |
| 459 |
if (TAILQ_EMPTY(&ifnet)) { |
| 460 |
error = EADDRNOTAVAIL; |
| 461 |
break; |
| 462 |
} |
| 463 |
if ((addr->sin_family != AF_INET) && |
| 464 |
(addr->sin_family != AF_IMPLINK)) { |
| 465 |
error = EAFNOSUPPORT; |
| 466 |
break; |
| 467 |
} |
| 468 |
inp->inp_faddr = addr->sin_addr; |
| 469 |
soisconnected(so); |
| 470 |
break; |
| 471 |
} |
| 472 |
|
| 473 |
case PRU_CONNECT2: |
| 474 |
error = EOPNOTSUPP; |
| 475 |
break; |
| 476 |
|
| 477 |
/* |
| 478 |
* Mark the connection as being incapable of further input. |
| 479 |
*/ |
| 480 |
case PRU_SHUTDOWN: |
| 481 |
socantsendmore(so); |
| 482 |
break; |
| 483 |
|
| 484 |
/* |
| 485 |
* Ship a packet out. The appropriate raw output |
| 486 |
* routine handles any massaging necessary. |
| 487 |
*/ |
| 488 |
case PRU_SEND: |
| 489 |
{ |
| 490 |
register u_long dst; |
| 491 |
|
| 492 |
if (so->so_state & SS_ISCONNECTED) { |
| 493 |
if (nam) { |
| 494 |
error = EISCONN; |
| 495 |
break; |
| 496 |
} |
| 497 |
dst = inp->inp_faddr.s_addr; |
| 498 |
} else { |
| 499 |
if (nam == NULL) { |
| 500 |
error = ENOTCONN; |
| 501 |
break; |
| 502 |
} |
| 503 |
dst = mtod(nam, struct sockaddr_in *)->sin_addr.s_addr; |
| 504 |
} |
| 505 |
error = rip_output(m, so, dst); |
| 506 |
m = NULL; |
| 507 |
break; |
| 508 |
} |
| 509 |
|
| 510 |
case PRU_SENSE: |
| 511 |
/* |
| 512 |
* stat: don't bother with a blocksize. |
| 513 |
*/ |
| 514 |
return (0); |
| 515 |
|
| 516 |
/* |
| 517 |
* Not supported. |
| 518 |
*/ |
| 519 |
case PRU_RCVOOB: |
| 520 |
case PRU_RCVD: |
| 521 |
case PRU_LISTEN: |
| 522 |
case PRU_ACCEPT: |
| 523 |
case PRU_SENDOOB: |
| 524 |
error = EOPNOTSUPP; |
| 525 |
break; |
| 526 |
|
| 527 |
case PRU_SOCKADDR: |
| 528 |
in_setsockaddr(inp, nam); |
| 529 |
break; |
| 530 |
|
| 531 |
case PRU_PEERADDR: |
| 532 |
in_setpeeraddr(inp, nam); |
| 533 |
break; |
| 534 |
|
| 535 |
default: |
| 536 |
panic("rip_usrreq"); |
| 537 |
} |
| 538 |
if (m != NULL) |
| 539 |
m_freem(m); |
| 540 |
return (error); |
| 541 |
} |
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