#include "dhcpd.h"
#include <sys/ioctl.h>
+#include <sys/uio.h>
#include <net/bpf.h>
-#include <net/if.h>
-#include <net/if_arp.h>
#include <net/if_dl.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/udp.h>
#include <netinet/if_ether.h>
+#if defined (USE_BPF_SEND) || defined (USE_BPF_RECEIVE)
/* 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. */
-void if_register (info, ifp)
- struct interface_info *addr;
+int if_register_bpf (info, ifp)
+ struct interface_info *info;
struct ifreq *ifp;
{
- int b;
+ int sock;
char filename[50];
- struct sockaddr_in sock;
+ int b;
/* Open a BPF device */
for (b = 0; 1; b++) {
snprintf(filename, sizeof(filename), "/dev/bpf%d", b);
- info -> wfdesc = .bpf = open(filename, O_RDWR, 0);
- if (info -> rfdesc < 0) {
+ sock = open (filename, O_RDWR, 0);
+ if (sock < 0) {
if (errno == EBUSY) {
continue;
} else {
}
/* Set the BPF device to point at this interface. */
- if (ioctl(info -> rfdesc, BIOCSETIF, ifp) < 0)
- error ("Can't BIOCSETIF on bpf: %m");
+ if (ioctl (sock, BIOCSETIF, ifp) < 0)
+ error ("Can't attach interface to bpf device: %m");
+
+ return sock;
+}
+#endif /* USE_BPF_SEND || USE_BPF_RECEIVE */
+
+#ifdef USE_BPF_SEND
+void if_register_send (info, interface)
+ struct interface_info *info;
+ struct ifreq *interface;
+{
+ /* 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
+ note ("Sending on %s", piaddr (info -> address));
}
+#endif /* USE_BPF_SEND */
+
+#ifdef USE_BPF_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 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, 12),
+
+ /* 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, 10),
+
+ /* 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, 8, 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, 5), /* patch */
+
+ /* Is it to the broadcast address? */
+ BPF_STMT(BPF_LD+BPF_W+BPF_ABS, 30),
+ BPF_JUMP(BPF_JMP+BPF_JEQ+BPF_K, 0xffffffff, 2, 0),
+
+ /* If not, is it to our address? */
+
+ BPF_STMT(BPF_LD+BPF_W+BPF_ABS, 30),
+ BPF_JUMP(BPF_JMP+BPF_JEQ+BPF_K, 0xffffffff, 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),
+};
+
+void if_register_receive (info, interface)
+ struct interface_info *info;
+ struct ifreq *interface;
+{
+ int flag = 1;
+ struct bpf_version v;
+ u_int32_t addr;
+ struct bpf_program p;
+
+ /* Open a BPF device and hang it on this interface... */
+ info -> rfdesc = if_register_bpf (info, interface);
+
+ /* 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");
+
+ /* 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;
+
+ /* Patch the server port and interface address into the BPF
+ program... XXX changes to filter program may require changes
+ to the insn numbers used below! XXX */
+ filter [8].k = ntohs (server_port);
+ memcpy (&addr, info -> address.iabuf, 4);
+ filter [12].k = ntohl (addr);
+
+ /* Set up the bpf filter program structure. */
+ p.bf_len = sizeof filter / sizeof (struct bpf_insn);
+ p.bf_insns = filter;
+
+ if (ioctl (info -> rfdesc, BIOCSETF, &p) < 0)
+ error ("Can't install packet filter program: %m");
+ note ("Listening on %s", piaddr (info -> address));
+}
+#endif /* USE_BPF_RECEIVE */
+
+#ifdef USE_BPF_SEND
+size_t send_packet (interface, packet, raw, len, to, hto)
+ struct interface_info *interface;
+ struct packet *packet;
+ struct dhcp_packet *raw;
+ size_t len;
+ struct sockaddr_in *to;
+ struct hardware *hto;
+{
+ int bufp = 0;
+ unsigned char buf [256];
+ struct iovec iov [2];
+
+ /* Assemble the headers... */
+ assemble_hw_header (interface, buf, &bufp, hto);
+ assemble_udp_ip_header (interface, buf, &bufp,
+ to -> sin_addr.s_addr, to -> sin_port,
+ (unsigned char *)raw, len);
+
+ /* Fire it off */
+ iov [0].iov_base = 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
+size_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;
+}
+#endif
#include "dhcpd.h"
#include <sys/ioctl.h>
+#include <sys/uio.h>
#include <net/bpf.h>
-#include <net/if.h>
-#include <net/if_arp.h>
#include <net/if_dl.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/udp.h>
#include <netinet/if_ether.h>
+#if defined (USE_BPF_SEND) || defined (USE_BPF_RECEIVE)
/* 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. */
-void if_register (info, ifp)
- struct interface_info *addr;
+int if_register_bpf (info, ifp)
+ struct interface_info *info;
struct ifreq *ifp;
{
- int b;
+ int sock;
char filename[50];
- struct sockaddr_in sock;
+ int b;
/* Open a BPF device */
for (b = 0; 1; b++) {
snprintf(filename, sizeof(filename), "/dev/bpf%d", b);
- info -> wfdesc = .bpf = open(filename, O_RDWR, 0);
- if (info -> rfdesc < 0) {
+ sock = open (filename, O_RDWR, 0);
+ if (sock < 0) {
if (errno == EBUSY) {
continue;
} else {
}
/* Set the BPF device to point at this interface. */
- if (ioctl(info -> rfdesc, BIOCSETIF, ifp) < 0)
- error ("Can't BIOCSETIF on bpf: %m");
+ if (ioctl (sock, BIOCSETIF, ifp) < 0)
+ error ("Can't attach interface to bpf device: %m");
+
+ return sock;
+}
+#endif /* USE_BPF_SEND || USE_BPF_RECEIVE */
+
+#ifdef USE_BPF_SEND
+void if_register_send (info, interface)
+ struct interface_info *info;
+ struct ifreq *interface;
+{
+ /* 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
+ note ("Sending on %s", piaddr (info -> address));
}
+#endif /* USE_BPF_SEND */
+
+#ifdef USE_BPF_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 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, 12),
+
+ /* 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, 10),
+
+ /* 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, 8, 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, 5), /* patch */
+
+ /* Is it to the broadcast address? */
+ BPF_STMT(BPF_LD+BPF_W+BPF_ABS, 30),
+ BPF_JUMP(BPF_JMP+BPF_JEQ+BPF_K, 0xffffffff, 2, 0),
+
+ /* If not, is it to our address? */
+
+ BPF_STMT(BPF_LD+BPF_W+BPF_ABS, 30),
+ BPF_JUMP(BPF_JMP+BPF_JEQ+BPF_K, 0xffffffff, 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),
+};
+
+void if_register_receive (info, interface)
+ struct interface_info *info;
+ struct ifreq *interface;
+{
+ int flag = 1;
+ struct bpf_version v;
+ u_int32_t addr;
+ struct bpf_program p;
+
+ /* Open a BPF device and hang it on this interface... */
+ info -> rfdesc = if_register_bpf (info, interface);
+
+ /* 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");
+
+ /* 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;
+
+ /* Patch the server port and interface address into the BPF
+ program... XXX changes to filter program may require changes
+ to the insn numbers used below! XXX */
+ filter [8].k = ntohs (server_port);
+ memcpy (&addr, info -> address.iabuf, 4);
+ filter [12].k = ntohl (addr);
+
+ /* Set up the bpf filter program structure. */
+ p.bf_len = sizeof filter / sizeof (struct bpf_insn);
+ p.bf_insns = filter;
+
+ if (ioctl (info -> rfdesc, BIOCSETF, &p) < 0)
+ error ("Can't install packet filter program: %m");
+ note ("Listening on %s", piaddr (info -> address));
+}
+#endif /* USE_BPF_RECEIVE */
+
+#ifdef USE_BPF_SEND
+size_t send_packet (interface, packet, raw, len, to, hto)
+ struct interface_info *interface;
+ struct packet *packet;
+ struct dhcp_packet *raw;
+ size_t len;
+ struct sockaddr_in *to;
+ struct hardware *hto;
+{
+ int bufp = 0;
+ unsigned char buf [256];
+ struct iovec iov [2];
+
+ /* Assemble the headers... */
+ assemble_hw_header (interface, buf, &bufp, hto);
+ assemble_udp_ip_header (interface, buf, &bufp,
+ to -> sin_addr.s_addr, to -> sin_port,
+ (unsigned char *)raw, len);
+
+ /* Fire it off */
+ iov [0].iov_base = 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
+size_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;
+}
+#endif
projects / thirdparty / dhcp.git / commitdiff
