#endif /* not lint */
#include "dhcpd.h"
-#include <sys/ioctl.h>
-#ifdef USE_BPF
-
-#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>
-
-struct interface {
- struct in_addr address;
- int bpf;
-};
-
-static struct interface *if_list;
-static int num_ifaces;
-
-#endif
-
-/* List of sockets we're accepting packets on... */
-struct socklist {
- struct socklist *next;
- struct sockaddr_in addr;
- int sock;
-} *sockets;
-
-/* Return the list of IP addresses associated with each network interface. */
-
-u_int32_t *get_interface_list (count)
- int *count;
-{
- u_int32_t *intbuf = (u_int32_t *)0;
- static char buf [8192];
- struct ifconf ic;
- int i;
- int sock;
- int ifcount = 0;
- int ifix = 0;
-
- /* Create an unbound datagram socket to do the SIOCGIFADDR ioctl on. */
- if ((sock = socket (AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0)
- error ("Can't create addrlist socket");
-
- /* Get the interface configuration information... */
- ic.ifc_len = sizeof buf;
- ic.ifc_ifcu.ifcu_buf = (caddr_t)buf;
- i = ioctl(sock, SIOCGIFCONF, &ic);
- close (sock);
- if (i < 0)
- error ("ioctl: SIOCGIFCONF: %m");
-
- again:
- /* Cycle through the list of interfaces looking for IP addresses.
- Go through twice; once to count the number if addresses, and a
- second time to copy them into an array of addresses. */
- for (i = 0; i < ic.ifc_len;) {
- struct ifreq *ifp = (struct ifreq *)((caddr_t)ic.ifc_req + i);
-#ifdef HAVE_SIN_LEN
- i += (sizeof ifp -> ifr_name) + ifp -> ifr_addr.sa_len;
-#else
- i += sizeof *ifp;
-#endif
- if (ifp -> ifr_addr.sa_family == AF_INET) {
- struct sockaddr_in *foo =
- (struct sockaddr_in *)(&ifp -> ifr_addr);
- /* We don't want the loopback interface. */
- if (foo -> sin_addr.s_addr == INADDR_LOOPBACK)
- continue;
- if (intbuf) {
- intbuf [ifix] = foo -> sin_addr.s_addr;
-#ifdef USE_BPF
- /* Open a bpf device for this interface */
- {
- int b;
- char filename[50];
-
- for (b = 0; 1; b++)
- {
- snprintf(filename, sizeof(filename),
- "/dev/bpf%d", b);
- if ((if_list[ifix].bpf =
- open(filename, O_RDWR, 0)) < 0)
- if (errno == EBUSY)
- continue;
- else
- error ("Can't find free bpf: %m");
- else
- break;
- }
- if (ioctl(if_list[ifix].bpf,
- BIOCSETIF, ifp) < 0)
- error ("Can't BIOCSETIF on bpf: %m");
- }
- if_list[ifix].address = foo->sin_addr;
-#endif
- ifix++;
- } else {
- ++ifcount;
- }
- }
- }
- /* If we haven't already filled our array, allocate it and go
- again. */
- if (!intbuf) {
- intbuf = (u_int32_t *)dmalloc ((ifcount + 1)
- * sizeof (u_int32_t),
- "get_interface_list");
- if (!intbuf)
- return intbuf;
-#ifdef USE_BPF
- num_ifaces = ifcount;
- if (!(if_list = (struct interface *)dmalloc
- (num_ifaces * sizeof(*if_list),
- "get_interface_list")))
- error ("Can't allocate memory for if_list");
-#endif
- goto again;
- }
- *count = ifcount;
- return intbuf;
-}
-
-void listen_on (port, address)
- u_int16_t port;
- u_int32_t address;
+void if_register_socket (info, interface)
+ struct interface_info *info;
+ struct ifreq *interface;
{
struct sockaddr_in name;
int sock;
int flag;
name.sin_family = AF_INET;
- name.sin_port = port;
- name.sin_addr.s_addr = address;
+ name.sin_port = server_port;
+ memcpy (&name.sin_addr.s_addr, info -> address.iabuf, 4);
memset (name.sin_zero, 0, sizeof (name.sin_zero));
/* List addresses on which we're listening. */
if (bind (sock, (struct sockaddr *)&name, sizeof name) < 0)
error ("Can't bind to dhcp address: %m");
- tmp = (struct socklist *)dmalloc (sizeof (struct socklist),
- "listen_on");
- if (!tmp)
- error ("Can't allocate memory for socket list.");
- tmp -> addr = name;
- tmp -> sock = sock;
- tmp -> next = sockets;
- sockets = tmp;
+ info -> rfdesc = sock;
}
-unsigned char packbuf [4095]; /* Should cover the gnarliest MTU... */
-
-void dispatch ()
+#ifdef USE_SOCKET_SEND
+void if_register_send (info, interface)
+ struct interface_info *info;
+ struct ifreq *interface;
{
- struct sockaddr_in from;
- struct iaddr ifrom;
- int fromlen = sizeof from;
- fd_set r, w, x;
- struct socklist *l;
- int max = 0;
- int count;
- int result;
-
- FD_ZERO (&r);
- FD_ZERO (&w);
- FD_ZERO (&x);
-
- do {
- /* Set up the read mask. */
- for (l = sockets; l; l = l -> next) {
- FD_SET (l -> sock, &r);
- FD_SET (l -> sock, &x);
- if (l -> sock > max)
- max = l -> sock;
- }
-
- /* Wait for a packet or a timeout... XXX */
- count = select (max + 1, &r, &w, &x, (struct timeval *)0);
-
- /* Get the current time... */
- GET_TIME (&cur_time);
-
- /* Not likely to be transitory... */
- if (count < 0)
- error ("select: %m");
-
- for (l = sockets; l; l = l -> next) {
- if (!FD_ISSET (l -> sock, &r))
- continue;
- if ((result =
- recvfrom (l -> sock, packbuf, sizeof packbuf, 0,
- (struct sockaddr *)&from, &fromlen))
- < 0) {
- warn ("recvfrom failed on %s: %m",
- inet_ntoa (l -> addr.sin_addr));
- sleep (5);
- continue;
- }
- note ("request from %s, port %d",
- inet_ntoa (from.sin_addr),
- htons (from.sin_port));
- ifrom.len = 4;
- memcpy (ifrom.iabuf, &from.sin_addr, ifrom.len);
-
- do_packet (packbuf, result, from.sin_port,
- ifrom, l -> sock);
- }
- } while (1);
+ if_register_socket (info, interface);
}
-#ifndef USE_BPF
-
-int sendpkt (packet, raw, len, to, tolen)
+int send_packet (interface, packet, raw, len, to, hto)
struct packet *packet;
struct dhcp_packet *raw;
size_t len;
- struct sockaddr *to;
- int tolen;
-{
- return(sendto(packet->client_sock, raw, len, 0, to, tolen));
-}
-
-#else
-
-static void IpChecksum(struct ip *ip);
-static void UdpChecksum(struct ip *ip);
-static u_int32_t Checksum(u_int16_t *buf, int nwords);
-
-struct raw_packet
-{
- u_int16_t space;
- struct ether_header en_hdr;
- struct ip ip;
- struct udphdr udp;
- struct dhcp_packet dhcp;
-};
-
-int sendpkt (in_packet, raw, len, to, tolen)
- struct packet *in_packet;
- struct dhcp_packet *raw;
- size_t len;
- struct sockaddr *to;
- int tolen;
-{
- int i, k;
- struct iaddr dest;
- struct subnet *subnet;
- struct raw_packet out_packet;
- struct raw_packet *const pkt = &out_packet;
-
-/* Find local subnet, or else forward to gateway */
-
- dest.len = 4;
- memcpy(&dest.iabuf, &((struct sockaddr_in *) to)->sin_addr, dest.len);
- if ((subnet = find_subnet(dest)) == NULL)
- return(sendto(in_packet->client_sock, raw, len, 0, to, tolen));
-
-/* Find interface corresponding to subnet */
-
- for (i = 0; i < num_ifaces; i++)
- {
- for (k = 0; k < subnet->net.len
- && (dest.iabuf[k] & subnet->netmask.iabuf[k])
- == (subnet->net.iabuf[k] & subnet->netmask.iabuf[k]);
- k++);
- if (k == subnet->net.len)
- break;
- }
- if (i == num_ifaces)
- return(sendto(in_packet->client_sock, raw, len, 0, to, tolen));
-
-/* EtherNet header */
-
- memset(pkt->en_hdr.ether_dhost, 0xff, sizeof(pkt->en_hdr.ether_dhost));
- memset(pkt->en_hdr.ether_shost, 0x00, sizeof(pkt->en_hdr.ether_shost));
- pkt->en_hdr.ether_type = ETHERTYPE_IP;
-
-/* IP header (except for checksum) */
-
- pkt->ip.ip_v = 4;
- pkt->ip.ip_hl = 5;
- pkt->ip.ip_tos = IPTOS_LOWDELAY;
- pkt->ip.ip_len = htons(sizeof(pkt->ip) + sizeof(pkt->udp) + len);
- pkt->ip.ip_id = 0;
- pkt->ip.ip_off = 0;
- pkt->ip.ip_ttl = 16;
- pkt->ip.ip_p = IPPROTO_UDP;
- pkt->ip.ip_sum = 0;
- pkt->ip.ip_src = if_list[i].address;
- inet_aton("255.255.255.255", &pkt->ip.ip_dst);
-
-/* UDP header */
-
- pkt->udp.uh_sport = htons(67); /* XXX! */
- pkt->udp.uh_dport = in_packet->client_port;
- pkt->udp.uh_ulen = htons(sizeof(pkt->udp) + len);
- pkt->udp.uh_sum = 0;
-
-/* DHCP packet */
-
- pkt->dhcp = *raw;
-
-/* Compute checksums */
-
- UdpChecksum(&pkt->ip);
- IpChecksum(&pkt->ip);
-
-/* Fire it off */
-
- if (write(if_list[i].bpf, &pkt->en_hdr,
- ntohs(pkt->ip.ip_len) + sizeof(pkt->en_hdr)) < 0)
- warn ("Can't deliver packet: write: %m");
- return(0);
-}
-
-/*
- * UdpChecksum()
- *
- * Recompute a UDP checksum on a packet
- *
- * UDP pseudo-header (prot = IPPROTO_UDP = 17):
- *
- * | source IP address |
- * | dest. IP address |
- * | zero | prot | UDP leng |
- *
- */
-
-static void
-UdpChecksum(struct ip *ip)
+ struct sockaddr_in *to;
+ struct hardware_addr *hto;
{
- struct udphdr *udp = (struct udphdr *) ((long *) ip + ip->ip_hl);
- u_int32_t sum;
-
-/* Pad with zero */
-
- if (ntohs(udp->uh_ulen) & 0x1)
- *((u_char *) udp + ntohs(udp->uh_ulen)) = 0;
-
-/* Do pseudo-header first */
-
- sum = Checksum((u_int16_t *) &ip->ip_src, 4);
- sum += (u_int16_t) IPPROTO_UDP;
- sum += (u_int16_t) ntohs(udp->uh_ulen);
-
-/* Now do UDP packet itself */
-
- udp->uh_sum = 0;
- sum += Checksum((u_int16_t *) udp,
- ((u_int16_t) ntohs(udp->uh_ulen) + 1) >> 1);
-
-/* Flip it & stick it */
-
- sum = (sum >> 16) + (sum & 0xFFFF);
- sum += (sum >> 16);
- sum = ~sum;
-
- udp->uh_sum = htons(sum);
+ return sendto (interface -> wfdesc, raw, len, 0,
+ (struct sockaddr *)to, sizeof *to);
}
+#endif /* USE_SOCKET_SEND */
-/*
- * IpChecksum()
- *
- * Recompute an IP header checksum
- *
- */
-
-static void
-IpChecksum(struct ip *ip)
+#ifdef USE_SOCKET_RECEIVE
+void if_register_send (info, interface)
+ struct interface_info *info;
+ struct ifreq *interface;
{
- u_int32_t sum;
-
-/* Sum up IP header words */
-
- ip->ip_sum = 0;
- sum = Checksum((u_int16_t *) ip, ip->ip_hl * 2);
-
-/* Flip it & stick it */
-
- sum = (sum >> 16) + (sum & 0xFFFF);
- sum += (sum >> 16);
- sum = ~sum;
-
- ip->ip_sum = htons(sum);
-}
-
-/*
- * Checksum()
- *
- * Do the one's complement sum thing over a range of words
- * Ideally, this should get replaced by an assembly version.
- */
-
-static u_int32_t
-Checksum(u_int16_t *buf, int nwords)
-{
- u_int32_t sum = 0;
-
- while (nwords--)
- sum += (u_int16_t) ntohs(*buf++);
- return(sum);
-}
-
+/* Do nothing unless we're using a different API for sending packets... */
+#ifndef USE_SOCKET_SEND
+ if_register_socket (info, interface);
#endif
-
+}
+#endif /* USE_SOCKET_RECEIVE */
#endif /* not lint */
#include "dhcpd.h"
-#include <sys/ioctl.h>
-#ifdef USE_BPF
-
-#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>
-
-struct interface {
- struct in_addr address;
- int bpf;
-};
-
-static struct interface *if_list;
-static int num_ifaces;
-
-#endif
-
-/* List of sockets we're accepting packets on... */
-struct socklist {
- struct socklist *next;
- struct sockaddr_in addr;
- int sock;
-} *sockets;
-
-/* Return the list of IP addresses associated with each network interface. */
-
-u_int32_t *get_interface_list (count)
- int *count;
-{
- u_int32_t *intbuf = (u_int32_t *)0;
- static char buf [8192];
- struct ifconf ic;
- int i;
- int sock;
- int ifcount = 0;
- int ifix = 0;
-
- /* Create an unbound datagram socket to do the SIOCGIFADDR ioctl on. */
- if ((sock = socket (AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0)
- error ("Can't create addrlist socket");
-
- /* Get the interface configuration information... */
- ic.ifc_len = sizeof buf;
- ic.ifc_ifcu.ifcu_buf = (caddr_t)buf;
- i = ioctl(sock, SIOCGIFCONF, &ic);
- close (sock);
- if (i < 0)
- error ("ioctl: SIOCGIFCONF: %m");
-
- again:
- /* Cycle through the list of interfaces looking for IP addresses.
- Go through twice; once to count the number if addresses, and a
- second time to copy them into an array of addresses. */
- for (i = 0; i < ic.ifc_len;) {
- struct ifreq *ifp = (struct ifreq *)((caddr_t)ic.ifc_req + i);
-#ifdef HAVE_SIN_LEN
- i += (sizeof ifp -> ifr_name) + ifp -> ifr_addr.sa_len;
-#else
- i += sizeof *ifp;
-#endif
- if (ifp -> ifr_addr.sa_family == AF_INET) {
- struct sockaddr_in *foo =
- (struct sockaddr_in *)(&ifp -> ifr_addr);
- /* We don't want the loopback interface. */
- if (foo -> sin_addr.s_addr == INADDR_LOOPBACK)
- continue;
- if (intbuf) {
- intbuf [ifix] = foo -> sin_addr.s_addr;
-#ifdef USE_BPF
- /* Open a bpf device for this interface */
- {
- int b;
- char filename[50];
-
- for (b = 0; 1; b++)
- {
- snprintf(filename, sizeof(filename),
- "/dev/bpf%d", b);
- if ((if_list[ifix].bpf =
- open(filename, O_RDWR, 0)) < 0)
- if (errno == EBUSY)
- continue;
- else
- error ("Can't find free bpf: %m");
- else
- break;
- }
- if (ioctl(if_list[ifix].bpf,
- BIOCSETIF, ifp) < 0)
- error ("Can't BIOCSETIF on bpf: %m");
- }
- if_list[ifix].address = foo->sin_addr;
-#endif
- ifix++;
- } else {
- ++ifcount;
- }
- }
- }
- /* If we haven't already filled our array, allocate it and go
- again. */
- if (!intbuf) {
- intbuf = (u_int32_t *)dmalloc ((ifcount + 1)
- * sizeof (u_int32_t),
- "get_interface_list");
- if (!intbuf)
- return intbuf;
-#ifdef USE_BPF
- num_ifaces = ifcount;
- if (!(if_list = (struct interface *)dmalloc
- (num_ifaces * sizeof(*if_list),
- "get_interface_list")))
- error ("Can't allocate memory for if_list");
-#endif
- goto again;
- }
- *count = ifcount;
- return intbuf;
-}
-
-void listen_on (port, address)
- u_int16_t port;
- u_int32_t address;
+void if_register_socket (info, interface)
+ struct interface_info *info;
+ struct ifreq *interface;
{
struct sockaddr_in name;
int sock;
int flag;
name.sin_family = AF_INET;
- name.sin_port = port;
- name.sin_addr.s_addr = address;
+ name.sin_port = server_port;
+ memcpy (&name.sin_addr.s_addr, info -> address.iabuf, 4);
memset (name.sin_zero, 0, sizeof (name.sin_zero));
/* List addresses on which we're listening. */
if (bind (sock, (struct sockaddr *)&name, sizeof name) < 0)
error ("Can't bind to dhcp address: %m");
- tmp = (struct socklist *)dmalloc (sizeof (struct socklist),
- "listen_on");
- if (!tmp)
- error ("Can't allocate memory for socket list.");
- tmp -> addr = name;
- tmp -> sock = sock;
- tmp -> next = sockets;
- sockets = tmp;
+ info -> rfdesc = sock;
}
-unsigned char packbuf [4095]; /* Should cover the gnarliest MTU... */
-
-void dispatch ()
+#ifdef USE_SOCKET_SEND
+void if_register_send (info, interface)
+ struct interface_info *info;
+ struct ifreq *interface;
{
- struct sockaddr_in from;
- struct iaddr ifrom;
- int fromlen = sizeof from;
- fd_set r, w, x;
- struct socklist *l;
- int max = 0;
- int count;
- int result;
-
- FD_ZERO (&r);
- FD_ZERO (&w);
- FD_ZERO (&x);
-
- do {
- /* Set up the read mask. */
- for (l = sockets; l; l = l -> next) {
- FD_SET (l -> sock, &r);
- FD_SET (l -> sock, &x);
- if (l -> sock > max)
- max = l -> sock;
- }
-
- /* Wait for a packet or a timeout... XXX */
- count = select (max + 1, &r, &w, &x, (struct timeval *)0);
-
- /* Get the current time... */
- GET_TIME (&cur_time);
-
- /* Not likely to be transitory... */
- if (count < 0)
- error ("select: %m");
-
- for (l = sockets; l; l = l -> next) {
- if (!FD_ISSET (l -> sock, &r))
- continue;
- if ((result =
- recvfrom (l -> sock, packbuf, sizeof packbuf, 0,
- (struct sockaddr *)&from, &fromlen))
- < 0) {
- warn ("recvfrom failed on %s: %m",
- inet_ntoa (l -> addr.sin_addr));
- sleep (5);
- continue;
- }
- note ("request from %s, port %d",
- inet_ntoa (from.sin_addr),
- htons (from.sin_port));
- ifrom.len = 4;
- memcpy (ifrom.iabuf, &from.sin_addr, ifrom.len);
-
- do_packet (packbuf, result, from.sin_port,
- ifrom, l -> sock);
- }
- } while (1);
+ if_register_socket (info, interface);
}
-#ifndef USE_BPF
-
-int sendpkt (packet, raw, len, to, tolen)
+int send_packet (interface, packet, raw, len, to, hto)
struct packet *packet;
struct dhcp_packet *raw;
size_t len;
- struct sockaddr *to;
- int tolen;
-{
- return(sendto(packet->client_sock, raw, len, 0, to, tolen));
-}
-
-#else
-
-static void IpChecksum(struct ip *ip);
-static void UdpChecksum(struct ip *ip);
-static u_int32_t Checksum(u_int16_t *buf, int nwords);
-
-struct raw_packet
-{
- u_int16_t space;
- struct ether_header en_hdr;
- struct ip ip;
- struct udphdr udp;
- struct dhcp_packet dhcp;
-};
-
-int sendpkt (in_packet, raw, len, to, tolen)
- struct packet *in_packet;
- struct dhcp_packet *raw;
- size_t len;
- struct sockaddr *to;
- int tolen;
-{
- int i, k;
- struct iaddr dest;
- struct subnet *subnet;
- struct raw_packet out_packet;
- struct raw_packet *const pkt = &out_packet;
-
-/* Find local subnet, or else forward to gateway */
-
- dest.len = 4;
- memcpy(&dest.iabuf, &((struct sockaddr_in *) to)->sin_addr, dest.len);
- if ((subnet = find_subnet(dest)) == NULL)
- return(sendto(in_packet->client_sock, raw, len, 0, to, tolen));
-
-/* Find interface corresponding to subnet */
-
- for (i = 0; i < num_ifaces; i++)
- {
- for (k = 0; k < subnet->net.len
- && (dest.iabuf[k] & subnet->netmask.iabuf[k])
- == (subnet->net.iabuf[k] & subnet->netmask.iabuf[k]);
- k++);
- if (k == subnet->net.len)
- break;
- }
- if (i == num_ifaces)
- return(sendto(in_packet->client_sock, raw, len, 0, to, tolen));
-
-/* EtherNet header */
-
- memset(pkt->en_hdr.ether_dhost, 0xff, sizeof(pkt->en_hdr.ether_dhost));
- memset(pkt->en_hdr.ether_shost, 0x00, sizeof(pkt->en_hdr.ether_shost));
- pkt->en_hdr.ether_type = ETHERTYPE_IP;
-
-/* IP header (except for checksum) */
-
- pkt->ip.ip_v = 4;
- pkt->ip.ip_hl = 5;
- pkt->ip.ip_tos = IPTOS_LOWDELAY;
- pkt->ip.ip_len = htons(sizeof(pkt->ip) + sizeof(pkt->udp) + len);
- pkt->ip.ip_id = 0;
- pkt->ip.ip_off = 0;
- pkt->ip.ip_ttl = 16;
- pkt->ip.ip_p = IPPROTO_UDP;
- pkt->ip.ip_sum = 0;
- pkt->ip.ip_src = if_list[i].address;
- inet_aton("255.255.255.255", &pkt->ip.ip_dst);
-
-/* UDP header */
-
- pkt->udp.uh_sport = htons(67); /* XXX! */
- pkt->udp.uh_dport = in_packet->client_port;
- pkt->udp.uh_ulen = htons(sizeof(pkt->udp) + len);
- pkt->udp.uh_sum = 0;
-
-/* DHCP packet */
-
- pkt->dhcp = *raw;
-
-/* Compute checksums */
-
- UdpChecksum(&pkt->ip);
- IpChecksum(&pkt->ip);
-
-/* Fire it off */
-
- if (write(if_list[i].bpf, &pkt->en_hdr,
- ntohs(pkt->ip.ip_len) + sizeof(pkt->en_hdr)) < 0)
- warn ("Can't deliver packet: write: %m");
- return(0);
-}
-
-/*
- * UdpChecksum()
- *
- * Recompute a UDP checksum on a packet
- *
- * UDP pseudo-header (prot = IPPROTO_UDP = 17):
- *
- * | source IP address |
- * | dest. IP address |
- * | zero | prot | UDP leng |
- *
- */
-
-static void
-UdpChecksum(struct ip *ip)
+ struct sockaddr_in *to;
+ struct hardware_addr *hto;
{
- struct udphdr *udp = (struct udphdr *) ((long *) ip + ip->ip_hl);
- u_int32_t sum;
-
-/* Pad with zero */
-
- if (ntohs(udp->uh_ulen) & 0x1)
- *((u_char *) udp + ntohs(udp->uh_ulen)) = 0;
-
-/* Do pseudo-header first */
-
- sum = Checksum((u_int16_t *) &ip->ip_src, 4);
- sum += (u_int16_t) IPPROTO_UDP;
- sum += (u_int16_t) ntohs(udp->uh_ulen);
-
-/* Now do UDP packet itself */
-
- udp->uh_sum = 0;
- sum += Checksum((u_int16_t *) udp,
- ((u_int16_t) ntohs(udp->uh_ulen) + 1) >> 1);
-
-/* Flip it & stick it */
-
- sum = (sum >> 16) + (sum & 0xFFFF);
- sum += (sum >> 16);
- sum = ~sum;
-
- udp->uh_sum = htons(sum);
+ return sendto (interface -> wfdesc, raw, len, 0,
+ (struct sockaddr *)to, sizeof *to);
}
+#endif /* USE_SOCKET_SEND */
-/*
- * IpChecksum()
- *
- * Recompute an IP header checksum
- *
- */
-
-static void
-IpChecksum(struct ip *ip)
+#ifdef USE_SOCKET_RECEIVE
+void if_register_send (info, interface)
+ struct interface_info *info;
+ struct ifreq *interface;
{
- u_int32_t sum;
-
-/* Sum up IP header words */
-
- ip->ip_sum = 0;
- sum = Checksum((u_int16_t *) ip, ip->ip_hl * 2);
-
-/* Flip it & stick it */
-
- sum = (sum >> 16) + (sum & 0xFFFF);
- sum += (sum >> 16);
- sum = ~sum;
-
- ip->ip_sum = htons(sum);
-}
-
-/*
- * Checksum()
- *
- * Do the one's complement sum thing over a range of words
- * Ideally, this should get replaced by an assembly version.
- */
-
-static u_int32_t
-Checksum(u_int16_t *buf, int nwords)
-{
- u_int32_t sum = 0;
-
- while (nwords--)
- sum += (u_int16_t) ntohs(*buf++);
- return(sum);
-}
-
+/* Do nothing unless we're using a different API for sending packets... */
+#ifndef USE_SOCKET_SEND
+ if_register_socket (info, interface);
#endif
-
+}
+#endif /* USE_SOCKET_RECEIVE */
projects / thirdparty / dhcp.git / commitdiff
