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Diff for /src/external/mpl/dhcp/dist/common/nit.c between version 1.2.2.1 and 1.2.2.2

version 1.2.2.1, 2018/04/07 22:37:29 version 1.2.2.2, 2018/04/16 01:59:46
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   /*      $NetBSD$        */
   
   /* nit.c
   
      Network Interface Tap (NIT) network interface code, by Ted Lemon
      with one crucial tidbit of help from Stu Grossmen. */
   
   /*
    * Copyright (c) 2004-2017 by Internet Systems Consortium, Inc. ("ISC")
    * Copyright (c) 1996-2003 by Internet Software Consortium
    *
    * This Source Code Form is subject to the terms of the Mozilla Public
    * License, v. 2.0. If a copy of the MPL was not distributed with this
    * file, You can obtain one at http://mozilla.org/MPL/2.0/.
    *
    * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
    * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
    * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR
    * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
    * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
    * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
    * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
    *
    *   Internet Systems Consortium, Inc.
    *   950 Charter Street
    *   Redwood City, CA 94063
    *   <info@isc.org>
    *   https://www.isc.org/
    *
    */
   
   #include <sys/cdefs.h>
   __RCSID("$NetBSD$");
   
   #include "dhcpd.h"
   #if defined (USE_NIT_SEND) || defined (USE_NIT_RECEIVE)
   #include <sys/ioctl.h>
   #include <sys/uio.h>
   
   #include <sys/time.h>
   #include <net/nit.h>
   #include <net/nit_if.h>
   #include <net/nit_pf.h>
   #include <net/nit_buf.h>
   #include <sys/stropts.h>
   #include <net/packetfilt.h>
   
   #include <netinet/in_systm.h>
   #include "includes/netinet/ip.h"
   #include "includes/netinet/udp.h"
   #include "includes/netinet/if_ether.h"
   
   /* Reinitializes the specified interface after an address change.   This
      is not required for packet-filter APIs. */
   
   #ifdef USE_NIT_SEND
   void if_reinitialize_send (info)
           struct interface_info *info;
   {
   }
   #endif
   
   #ifdef USE_NIT_RECEIVE
   void if_reinitialize_receive (info)
           struct interface_info *info;
   {
   }
   #endif
   
   /* Called by get_interface_list for each interface that's discovered.
      Opens a packet filter for each interface and adds it to the select
      mask. */
   
   int if_register_nit (info)
           struct interface_info *info;
   {
           int sock;
           char filename[50];
           struct ifreq ifr;
           struct strioctl sio;
   
           /* Open a NIT device */
           sock = open ("/dev/nit", O_RDWR);
           if (sock < 0)
                   log_fatal ("Can't open NIT device for %s: %m", info -> name);
   
           /* Set the NIT device to point at this interface. */
           sio.ic_cmd = NIOCBIND;
           sio.ic_len = sizeof *(info -> ifp);
           sio.ic_dp = (char *)(info -> ifp);
           sio.ic_timout = INFTIM;
           if (ioctl (sock, I_STR, &sio) < 0)
                   log_fatal ("Can't attach interface %s to nit device: %m",
                          info -> name);
   
           /* Get the low-level address... */
           sio.ic_cmd = SIOCGIFADDR;
           sio.ic_len = sizeof ifr;
           sio.ic_dp = (char *)&ifr;
           sio.ic_timout = INFTIM;
           if (ioctl (sock, I_STR, &sio) < 0)
                   log_fatal ("Can't get physical layer address for %s: %m",
                          info -> name);
   
           /* XXX code below assumes ethernet interface! */
           info -> hw_address.hlen = 7;
           info -> hw_address.hbuf [0] = ARPHRD_ETHER;
           memcpy (&info -> hw_address.hbuf [1],
                   ifr.ifr_ifru.ifru_addr.sa_data, 6);
   
           if (ioctl (sock, I_PUSH, "pf") < 0)
                   log_fatal ("Can't push packet filter onto NIT for %s: %m",
                          info -> name);
   
           return sock;
   }
   #endif /* USE_NIT_SEND || USE_NIT_RECEIVE */
   
   #ifdef USE_NIT_SEND
   void if_register_send (info)
           struct interface_info *info;
   {
           /* If we're using the nit API for sending and receiving,
              we don't need to register this interface twice. */
   #ifndef USE_NIT_RECEIVE
           struct packetfilt pf;
           struct strioctl sio;
   
           info -> wfdesc = if_register_nit (info);
   
           pf.Pf_Priority = 0;
           pf.Pf_FilterLen = 1;
           pf.Pf_Filter [0] = ENF_PUSHZERO;
   
           /* Set up an NIT filter that rejects everything... */
           sio.ic_cmd = NIOCSETF;
           sio.ic_len = sizeof pf;
           sio.ic_dp = (char *)&pf;
           sio.ic_timout = INFTIM;
           if (ioctl (info -> wfdesc, I_STR, &sio) < 0)
                   log_fatal ("Can't set NIT filter: %m");
   #else
           info -> wfdesc = info -> rfdesc;
   #endif
           if (!quiet_interface_discovery)
                   log_info ("Sending on   NIT/%s%s%s",
                         print_hw_addr (info -> hw_address.hbuf [0],
                                        info -> hw_address.hlen - 1,
                                        &info -> hw_address.hbuf [1]),
                         (info -> shared_network ? "/" : ""),
                         (info -> shared_network ?
                          info -> shared_network -> name : ""));
   }
   
   void if_deregister_send (info)
           struct interface_info *info;
   {
           /* If we're using the nit API for sending and receiving,
              we don't need to register this interface twice. */
   #ifndef USE_NIT_RECEIVE
           close (info -> wfdesc);
   #endif
           info -> wfdesc = -1;
           if (!quiet_interface_discovery)
                   log_info ("Disabling output on NIT/%s%s%s",
                         print_hw_addr (info -> hw_address.hbuf [0],
                                        info -> hw_address.hlen - 1,
                                        &info -> hw_address.hbuf [1]),
                         (info -> shared_network ? "/" : ""),
                         (info -> shared_network ?
                          info -> shared_network -> name : ""));
   }
   #endif /* USE_NIT_SEND */
   
   #ifdef USE_NIT_RECEIVE
   /* Packet filter program...
      XXX Changes to the filter program may require changes to the constant
      offsets used in if_register_send to patch the NIT program! XXX */
   
   #if defined(RELAY_PORT)
   #error "Relay port is not yet supported for NIT"
   #endif
   
   void if_register_receive (info)
           struct interface_info *info;
   {
           int flag = 1;
           u_int32_t x;
           struct packetfilt pf;
           struct strioctl sio;
           u_int16_t addr [2];
           struct timeval t;
   
           /* Open a NIT device and hang it on this interface... */
           info -> rfdesc = if_register_nit (info);
   
           /* Set the snap length to 0, which means always take the whole
              packet. */
           x = 0;
           if (ioctl (info -> rfdesc, NIOCSSNAP, &x) < 0)
                   log_fatal ("Can't set NIT snap length on %s: %m", info -> name);
   
           /* Set the stream to byte stream mode */
           if (ioctl (info -> rfdesc, I_SRDOPT, RMSGN) != 0)
                   log_info ("I_SRDOPT failed on %s: %m", info -> name);
   
   #if 0
           /* Push on the chunker... */
           if (ioctl (info -> rfdesc, I_PUSH, "nbuf") < 0)
                   log_fatal ("Can't push chunker onto NIT STREAM: %m");
   
           /* Set the timeout to zero. */
           t.tv_sec = 0;
           t.tv_usec = 0;
           if (ioctl (info -> rfdesc, NIOCSTIME, &t) < 0)
                   log_fatal ("Can't set chunk timeout: %m");
   #endif
   
           /* Ask for no header... */
           x = 0;
           if (ioctl (info -> rfdesc, NIOCSFLAGS, &x) < 0)
                   log_fatal ("Can't set NIT flags on %s: %m", info -> name);
   
           /* Set up the NIT filter program. */
           /* XXX Unlike the BPF filter program, this one won't work if the
              XXX IP packet is fragmented or if there are options on the IP
              XXX header. */
           pf.Pf_Priority = 0;
           pf.Pf_FilterLen = 0;
   
           pf.Pf_Filter [pf.Pf_FilterLen++] = ENF_PUSHWORD + 6;
           pf.Pf_Filter [pf.Pf_FilterLen++] = ENF_PUSHLIT + ENF_CAND;
           pf.Pf_Filter [pf.Pf_FilterLen++] = htons (ETHERTYPE_IP);
           pf.Pf_Filter [pf.Pf_FilterLen++] = ENF_PUSHLIT;
           pf.Pf_Filter [pf.Pf_FilterLen++] = htons (IPPROTO_UDP);
           pf.Pf_Filter [pf.Pf_FilterLen++] = ENF_PUSHWORD + 11;
           pf.Pf_Filter [pf.Pf_FilterLen++] = ENF_PUSHLIT + ENF_AND;
           pf.Pf_Filter [pf.Pf_FilterLen++] = htons (0xFF);
           pf.Pf_Filter [pf.Pf_FilterLen++] = ENF_CAND;
           pf.Pf_Filter [pf.Pf_FilterLen++] = ENF_PUSHWORD + 18;
           pf.Pf_Filter [pf.Pf_FilterLen++] = ENF_PUSHLIT + ENF_CAND;
           pf.Pf_Filter [pf.Pf_FilterLen++] = *libdhcp_callbacks.local_port;
   
           /* Install the filter... */
           sio.ic_cmd = NIOCSETF;
           sio.ic_len = sizeof pf;
           sio.ic_dp = (char *)&pf;
           sio.ic_timout = INFTIM;
           if (ioctl (info -> rfdesc, I_STR, &sio) < 0)
                   log_fatal ("Can't set NIT filter on %s: %m", info -> name);
   
           if (!quiet_interface_discovery)
                   log_info ("Listening on NIT/%s%s%s",
                         print_hw_addr (info -> hw_address.hbuf [0],
                                        info -> hw_address.hlen - 1,
                                        &info -> hw_address.hbuf [1]),
                         (info -> shared_network ? "/" : ""),
                         (info -> shared_network ?
                          info -> shared_network -> name : ""));
   }
   
   void if_deregister_receive (info)
           struct interface_info *info;
   {
           /* If we're using the nit API for sending and receiving,
              we don't need to register this interface twice. */
           close (info -> rfdesc);
           info -> rfdesc = -1;
   
           if (!quiet_interface_discovery)
                   log_info ("Disabling input on NIT/%s%s%s",
                         print_hw_addr (info -> hw_address.hbuf [0],
                                        info -> hw_address.hlen - 1,
                                        &info -> hw_address.hbuf [1]),
                         (info -> shared_network ? "/" : ""),
                         (info -> shared_network ?
                          info -> shared_network -> name : ""));
   }
   #endif /* USE_NIT_RECEIVE */
   
   #ifdef USE_NIT_SEND
   ssize_t send_packet (interface, packet, raw, len, from, to, hto)
           struct interface_info *interface;
           struct packet *packet;
           struct dhcp_packet *raw;
           size_t len;
           struct in_addr from;
           struct sockaddr_in *to;
           struct hardware *hto;
   {
           unsigned hbufp, ibufp;
           double hh [16];
           double ih [1536 / sizeof (double)];
           unsigned char *buf = (unsigned char *)ih;
           struct sockaddr *junk;
           struct strbuf ctl, data;
           struct sockaddr_in foo;
           int result;
   
           if (!strcmp (interface -> name, "fallback"))
                   return send_fallback (interface, packet, raw,
                                         len, from, to, hto);
   
           if (hto == NULL && interface->anycast_mac_addr.hlen)
                   hto = &interface->anycast_mac_addr;
   
           /* Start with the sockaddr struct... */
           junk = (struct sockaddr *)&hh [0];
           hbufp = (((unsigned char *)&junk -> sa_data [0]) -
                    (unsigned char *)&hh[0]);
           ibufp = 0;
   
           /* Assemble the headers... */
           assemble_hw_header (interface, (unsigned char *)junk, &hbufp, hto);
           assemble_udp_ip_header (interface, buf, &ibufp,
                                   from.s_addr, to -> sin_addr.s_addr,
                                   to -> sin_port, (unsigned char *)raw, len);
   
           /* Copy the data into the buffer (yuk). */
           memcpy (buf + ibufp, raw, len);
   
           /* Set up the sockaddr structure... */
   #if USE_SIN_LEN
           junk -> sa_len = hbufp - 2; /* XXX */
   #endif
           junk -> sa_family = AF_UNSPEC;
   
           /* Set up the msg_buf structure... */
           ctl.buf = (char *)&hh [0];
           ctl.maxlen = ctl.len = hbufp;
           data.buf = (char *)&ih [0];
           data.maxlen = data.len = ibufp + len;
   
           result = putmsg (interface -> wfdesc, &ctl, &data, 0);
           if (result < 0)
                   log_error ("send_packet: %m");
           return result;
   }
   #endif /* USE_NIT_SEND */
   
   #ifdef USE_NIT_RECEIVE
   ssize_t receive_packet (interface, buf, len, from, hfrom)
           struct interface_info *interface;
           unsigned char *buf;
           size_t len;
           struct sockaddr_in *from;
           struct hardware *hfrom;
   {
           int nread;
           int length = 0;
           int offset = 0;
           unsigned char ibuf [1536];
           int bufix = 0;
           unsigned paylen;
   
           length = read (interface -> rfdesc, ibuf, sizeof ibuf);
           if (length <= 0)
                   return length;
   
           /* Decode the physical header... */
           offset = decode_hw_header (interface, ibuf, bufix, hfrom);
   
           /* If a physical layer checksum failed (dunno of any
              physical layer that supports this, but WTH), skip this
              packet. */
           if (offset < 0) {
                   return 0;
           }
   
           bufix += offset;
           length -= offset;
   
           /* Decode the IP and UDP headers... */
           offset = decode_udp_ip_header (interface, ibuf, bufix,
                                          from, length, &paylen, 1);
   
           /* If the IP or UDP checksum was bad, skip the packet... */
           if (offset < 0)
                   return 0;
   
           bufix += offset;
           length -= offset;
   
           if (length < paylen)
                   log_fatal("Internal inconsistency at %s:%d.", MDL);
   
           /* Copy out the data in the packet... */
           memcpy(buf, &ibuf[bufix], paylen);
           return paylen;
   }
   
   int can_unicast_without_arp (ip)
           struct interface_info *ip;
   {
           return 1;
   }
   
   int can_receive_unicast_unconfigured (ip)
           struct interface_info *ip;
   {
           return 1;
   }
   
   int supports_multiple_interfaces (ip)
           struct interface_info *ip;
   {
           return 1;
   }
   
   void maybe_setup_fallback ()
   {
           isc_result_t status;
           struct interface_info *fbi = (struct interface_info *)0;
           if (setup_fallback (&fbi, MDL)) {
                   if_register_fallback (fbi);
                   status = omapi_register_io_object ((omapi_object_t *)fbi,
                                                      if_readsocket, 0,
                                                      fallback_discard, 0, 0);
                   if (status != ISC_R_SUCCESS)
                           log_fatal ("Can't register I/O handle for %s: %s",
                                      fbi -> name, isc_result_totext (status));
                   interface_dereference (&fbi, MDL);
           }
   }
   #endif
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  Added in v.1.2.2.2
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