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-rw-r--r--contrib/isc-dhcp/common/bpf.c425
1 files changed, 0 insertions, 425 deletions
diff --git a/contrib/isc-dhcp/common/bpf.c b/contrib/isc-dhcp/common/bpf.c
deleted file mode 100644
index ba42a43903cd..000000000000
--- a/contrib/isc-dhcp/common/bpf.c
+++ /dev/null
@@ -1,425 +0,0 @@
-/* bpf.c
-
- BPF socket interface code, originally contributed by Archie Cobbs. */
-
-/*
- * Copyright (c) 1995, 1996, 1998, 1999
- * The Internet Software Consortium. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. Neither the name of The Internet Software Consortium nor the names
- * of its contributors may be used to endorse or promote products derived
- * from this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE INTERNET SOFTWARE CONSORTIUM AND
- * CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
- * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
- * DISCLAIMED. IN NO EVENT SHALL THE INTERNET SOFTWARE CONSORTIUM OR
- * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
- * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
- * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
- * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
- * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
- * This software has been written for the Internet Software Consortium
- * by Ted Lemon <mellon@fugue.com> in cooperation with Vixie
- * Enterprises. To learn more about the Internet Software Consortium,
- * see ``http://www.vix.com/isc''. To learn more about Vixie
- * Enterprises, see ``http://www.vix.com''.
- */
-
-#ifndef lint
-static char copyright[] =
-"$Id: bpf.c,v 1.19.2.6 1999/02/09 04:46:59 mellon Exp $ Copyright (c) 1995, 1996, 1998, 1999 The Internet Software Consortium. All rights reserved.\n";
-#endif /* not lint */
-
-#include "dhcpd.h"
-#if defined (USE_BPF_SEND) || defined (USE_BPF_RECEIVE) \
- || defined (USE_LPF_RECEIVE)
-# if defined (USE_LPF_RECEIVE)
-# include <asm/types.h>
-# include <linux/filter.h>
-# define bpf_insn sock_filter /* Linux: dare to be gratuitously different. */
-# else
-# include <sys/ioctl.h>
-# include <sys/uio.h>
-
-# include <net/bpf.h>
-# if defined (NEED_OSF_PFILT_HACKS)
-# include <net/pfilt.h>
-# endif
-# endif
-
-#include <netinet/in_systm.h>
-#include "includes/netinet/ip.h"
-#include "includes/netinet/udp.h"
-#include "includes/netinet/if_ether.h"
-#endif
-
-/* Reinitializes the specified interface after an address change. This
- is not required for packet-filter APIs. */
-
-#ifdef USE_BPF_SEND
-void if_reinitialize_send (info)
- struct interface_info *info;
-{
-}
-#endif
-
-#ifdef USE_BPF_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. */
-
-#if defined (USE_BPF_SEND) || defined (USE_BPF_RECEIVE)
-int if_register_bpf (info)
- struct interface_info *info;
-{
- int sock;
- char filename[50];
- int b;
-
- /* Open a BPF device */
- for (b = 0; 1; b++) {
-#ifndef NO_SNPRINTF
- snprintf(filename, sizeof(filename), BPF_FORMAT, b);
-#else
- sprintf(filename, BPF_FORMAT, b);
-#endif
- sock = open (filename, O_RDWR, 0);
- if (sock < 0) {
- if (errno == EBUSY) {
- continue;
- } else {
- if (!b)
- error ("No bpf devices.%s%s%s",
- " Please read the README",
- " section for your operating",
- " system.");
- error ("Can't find free bpf: %m");
- }
- } else {
- break;
- }
- }
-
- /* Set the BPF device to point at this interface. */
- if (ioctl (sock, BIOCSETIF, info -> ifp) < 0)
- error ("Can't attach interface %s to bpf device %s: %m",
- info -> name, filename);
-
- return sock;
-}
-#endif /* USE_BPF_SEND || USE_BPF_RECEIVE */
-
-#ifdef USE_BPF_SEND
-void if_register_send (info)
- struct interface_info *info;
-{
- /* If we're using the bpf API for sending and receiving,
- we don't need to register this interface twice. */
-#ifndef USE_BPF_RECEIVE
- info -> wfdesc = if_register_bpf (info, interface);
-#else
- info -> wfdesc = info -> rfdesc;
-#endif
- if (!quiet_interface_discovery)
- note ("Sending on BPF/%s/%s/%s",
- info -> name,
- print_hw_addr (info -> hw_address.htype,
- info -> hw_address.hlen,
- info -> hw_address.haddr),
- (info -> shared_network ?
- info -> shared_network -> name : "unattached"));
-}
-#endif /* USE_BPF_SEND */
-
-#if defined (USE_BPF_RECEIVE) || defined (USE_LPF_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 BPF program! XXX */
-
-struct bpf_insn dhcp_bpf_filter [] = {
- /* Make sure this is an IP packet... */
- BPF_STMT (BPF_LD + BPF_H + BPF_ABS, 12),
- BPF_JUMP (BPF_JMP + BPF_JEQ + BPF_K, ETHERTYPE_IP, 0, 8),
-
- /* Make sure it's a UDP packet... */
- BPF_STMT (BPF_LD + BPF_B + BPF_ABS, 23),
- BPF_JUMP (BPF_JMP + BPF_JEQ + BPF_K, IPPROTO_UDP, 0, 6),
-
- /* Make sure this isn't a fragment... */
- BPF_STMT(BPF_LD + BPF_H + BPF_ABS, 20),
- BPF_JUMP(BPF_JMP + BPF_JSET + BPF_K, 0x1fff, 4, 0),
-
- /* Get the IP header length... */
- BPF_STMT (BPF_LDX + BPF_B + BPF_MSH, 14),
-
- /* Make sure it's to the right port... */
- BPF_STMT (BPF_LD + BPF_H + BPF_IND, 16),
- BPF_JUMP (BPF_JMP + BPF_JEQ + BPF_K, 67, 0, 1), /* patch */
-
- /* If we passed all the tests, ask for the whole packet. */
- BPF_STMT(BPF_RET+BPF_K, (u_int)-1),
-
- /* Otherwise, drop it. */
- BPF_STMT(BPF_RET+BPF_K, 0),
-};
-
-int dhcp_bpf_filter_len = sizeof dhcp_bpf_filter / sizeof (struct bpf_insn);
-#endif
-
-#if defined (USE_BPF_RECEIVE)
-void if_register_receive (info)
- struct interface_info *info;
-{
- int flag = 1;
- struct bpf_version v;
- u_int32_t addr;
- struct bpf_program p;
- u_int32_t bits;
-
- /* Open a BPF device and hang it on this interface... */
- info -> rfdesc = if_register_bpf (info);
-
- /* Make sure the BPF version is in range... */
- if (ioctl (info -> rfdesc, BIOCVERSION, &v) < 0)
- error ("Can't get BPF version: %m");
-
- if (v.bv_major != BPF_MAJOR_VERSION ||
- v.bv_minor < BPF_MINOR_VERSION)
- error ("Kernel BPF version out of range - recompile dhcpd!");
-
- /* Set immediate mode so that reads return as soon as a packet
- comes in, rather than waiting for the input buffer to fill with
- packets. */
- if (ioctl (info -> rfdesc, BIOCIMMEDIATE, &flag) < 0)
- error ("Can't set immediate mode on bpf device: %m");
-
-#ifdef NEED_OSF_PFILT_HACKS
- /* Allow the copyall flag to be set... */
- if (ioctl(info -> rfdesc, EIOCALLOWCOPYALL, &flag) < 0)
- error ("Can't set ALLOWCOPYALL: %m");
-
- /* Clear all the packet filter mode bits first... */
- bits = 0;
- if (ioctl (info -> rfdesc, EIOCMBIS, &bits) < 0)
- error ("Can't clear pfilt bits: %m");
-
- /* Set the ENBATCH, ENCOPYALL, ENBPFHDR bits... */
- bits = ENBATCH | ENCOPYALL | ENBPFHDR;
- if (ioctl (info -> rfdesc, EIOCMBIS, &bits) < 0)
- error ("Can't set ENBATCH|ENCOPYALL|ENBPFHDR: %m");
-#endif
- /* Get the required BPF buffer length from the kernel. */
- if (ioctl (info -> rfdesc, BIOCGBLEN, &info -> rbuf_max) < 0)
- error ("Can't get bpf buffer length: %m");
- info -> rbuf = malloc (info -> rbuf_max);
- if (!info -> rbuf)
- error ("Can't allocate %d bytes for bpf input buffer.");
- info -> rbuf_offset = 0;
- info -> rbuf_len = 0;
-
- /* Set up the bpf filter program structure. */
- p.bf_len = dhcp_bpf_filter_len;
- p.bf_insns = dhcp_bpf_filter;
-
- /* Patch the server port into the BPF program...
- XXX changes to filter program may require changes
- to the insn number(s) used below! XXX */
- dhcp_bpf_filter [8].k = ntohs (local_port);
-
- if (ioctl (info -> rfdesc, BIOCSETF, &p) < 0)
- error ("Can't install packet filter program: %m");
- if (!quiet_interface_discovery)
- note ("Listening on BPF/%s/%s/%s",
- info -> name,
- print_hw_addr (info -> hw_address.htype,
- info -> hw_address.hlen,
- info -> hw_address.haddr),
- (info -> shared_network ?
- info -> shared_network -> name : "unattached"));
-}
-#endif /* USE_BPF_RECEIVE */
-
-#ifdef USE_BPF_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;
-{
- int bufp = 0;
- unsigned char buf [256];
- struct iovec iov [2];
-
- if (!strcmp (interface -> name, "fallback"))
- return send_fallback (interface, packet, raw,
- len, from, to, hto);
-
- /* Assemble the headers... */
- assemble_hw_header (interface, buf, &bufp, hto);
- assemble_udp_ip_header (interface, buf, &bufp, from.s_addr,
- to -> sin_addr.s_addr, to -> sin_port,
- (unsigned char *)raw, len);
-
- /* Fire it off */
- iov [0].iov_base = (char *)buf;
- iov [0].iov_len = bufp;
- iov [1].iov_base = (char *)raw;
- iov [1].iov_len = len;
-
- return writev(interface -> wfdesc, iov, 2);
-}
-#endif /* USE_BPF_SEND */
-
-#ifdef USE_BPF_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 length = 0;
- int offset = 0;
- struct bpf_hdr hdr;
-
- /* All this complexity is because BPF doesn't guarantee
- that only one packet will be returned at a time. We're
- getting what we deserve, though - this is a terrible abuse
- of the BPF interface. Sigh. */
-
- /* Process packets until we get one we can return or until we've
- done a read and gotten nothing we can return... */
-
- do {
- /* If the buffer is empty, fill it. */
- if (interface -> rbuf_offset == interface -> rbuf_len) {
- length = read (interface -> rfdesc,
- interface -> rbuf,
- interface -> rbuf_max);
- if (length <= 0)
- return length;
- interface -> rbuf_offset = 0;
- interface -> rbuf_len = length;
- }
-
- /* If there isn't room for a whole bpf header, something went
- wrong, but we'll ignore it and hope it goes away... XXX */
- if (interface -> rbuf_len -
- interface -> rbuf_offset < sizeof hdr) {
- interface -> rbuf_offset = interface -> rbuf_len;
- continue;
- }
-
- /* Copy out a bpf header... */
- memcpy (&hdr, &interface -> rbuf [interface -> rbuf_offset],
- sizeof hdr);
-
- /* If the bpf header plus data doesn't fit in what's left
- of the buffer, stick head in sand yet again... */
- if (interface -> rbuf_offset +
- hdr.bh_hdrlen + hdr.bh_caplen > interface -> rbuf_len) {
- interface -> rbuf_offset = interface -> rbuf_len;
- continue;
- }
-
- /* If the captured data wasn't the whole packet, or if
- the packet won't fit in the input buffer, all we
- can do is drop it. */
- if (hdr.bh_caplen != hdr.bh_datalen) {
- interface -> rbuf_offset +=
- hdr.bh_hdrlen = hdr.bh_caplen;
- continue;
- }
-
- /* Skip over the BPF header... */
- interface -> rbuf_offset += hdr.bh_hdrlen;
-
- /* Decode the physical header... */
- offset = decode_hw_header (interface,
- interface -> rbuf,
- interface -> rbuf_offset,
- hfrom);
-
- /* If a physical layer checksum failed (dunno of any
- physical layer that supports this, but WTH), skip this
- packet. */
- if (offset < 0) {
- interface -> rbuf_offset += hdr.bh_caplen;
- continue;
- }
- interface -> rbuf_offset += offset;
- hdr.bh_caplen -= offset;
-
- /* Decode the IP and UDP headers... */
- offset = decode_udp_ip_header (interface,
- interface -> rbuf,
- interface -> rbuf_offset,
- from,
- (unsigned char *)0,
- hdr.bh_caplen);
-
- /* If the IP or UDP checksum was bad, skip the packet... */
- if (offset < 0) {
- interface -> rbuf_offset += hdr.bh_caplen;
- continue;
- }
- interface -> rbuf_offset += offset;
- hdr.bh_caplen -= offset;
-
- /* If there's not enough room to stash the packet data,
- we have to skip it (this shouldn't happen in real
- life, though). */
- if (hdr.bh_caplen > len) {
- interface -> rbuf_offset += hdr.bh_caplen;
- continue;
- }
-
- /* Copy out the data in the packet... */
- memcpy (buf, interface -> rbuf + interface -> rbuf_offset,
- hdr.bh_caplen);
- interface -> rbuf_offset += hdr.bh_caplen;
- return hdr.bh_caplen;
- } while (!length);
- return 0;
-}
-
-int can_unicast_without_arp ()
-{
- return 1;
-}
-
-void maybe_setup_fallback ()
-{
- struct interface_info *fbi;
- fbi = setup_fallback ();
- if (fbi) {
- if_register_fallback (fbi);
- add_protocol ("fallback", fallback_interface -> wfdesc,
- fallback_discard, fallback_interface);
- }
-}
-#endif
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