+++ /dev/null
-/*
- * Copyright (c) 1988-2013 Apple Inc. All rights reserved.
- *
- * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
- *
- * This file contains Original Code and/or Modifications of Original Code
- * as defined in and that are subject to the Apple Public Source License
- * Version 2.0 (the 'License'). You may not use this file except in
- * compliance with the License. The rights granted to you under the License
- * may not be used to create, or enable the creation or redistribution of,
- * unlawful or unlicensed copies of an Apple operating system, or to
- * circumvent, violate, or enable the circumvention or violation of, any
- * terms of an Apple operating system software license agreement.
- *
- * Please obtain a copy of the License at
- * http://www.opensource.apple.com/apsl/ and read it before using this file.
- *
- * The Original Code and all software distributed under the License are
- * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
- * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
- * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
- * Please see the License for the specific language governing rights and
- * limitations under the License.
- *
- * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
- */
-
-/*
- * in_dhcp.c
- * - use DHCP to allocate an IP address and get the subnet mask and router
- */
-
-/*
- * Modification History
- *
- * April 17, 2007 Dieter Siegmund (dieter@apple.com)
- * - created based on in_bootp.c
- */
-
-#include <sys/param.h>
-#include <sys/types.h>
-#include <mach/boolean.h>
-#include <sys/kernel.h>
-#include <sys/errno.h>
-#include <sys/file.h>
-#include <sys/uio.h>
-#include <sys/ioctl.h>
-#include <sys/time.h>
-#include <sys/mbuf.h>
-#include <sys/vnode.h>
-#include <sys/socket.h>
-#include <sys/socketvar.h>
-#include <sys/uio_internal.h>
-#include <net/if.h>
-#include <net/if_dl.h>
-#include <net/if_types.h>
-#include <net/route.h>
-#include <net/dlil.h>
-#include <netinet/in.h>
-#include <netinet/in_systm.h>
-#include <netinet/if_ether.h>
-#include <netinet/ip.h>
-#include <netinet/ip_var.h>
-#include <netinet/udp.h>
-#include <netinet/udp_var.h>
-#include <netinet/ip_icmp.h>
-#include <netinet/bootp.h>
-#include <netinet/dhcp.h>
-#include <netinet/in_dhcp.h>
-#include <sys/systm.h>
-#include <sys/malloc.h>
-#include <netinet/dhcp_options.h>
-
-#include <kern/kern_types.h>
-#include <kern/kalloc.h>
-
-#ifdef DHCP_DEBUG
-#define dprintf(x) printf x;
-#else /* !DHCP_DEBUG */
-#define dprintf(x)
-#endif /* DHCP_DEBUG */
-
-#define INITIAL_WAIT_SECS 2
-#define MAX_WAIT_SECS 64
-#define GATHER_TIME_SECS 4
-#define RAND_TICKS (hz) /* one second */
-
-const struct sockaddr_in blank_sin = {
- sizeof(struct sockaddr_in),
- AF_INET,
- 0,
- { 0 },
- { 0, 0, 0, 0, 0, 0, 0, 0 }
-};
-
-__private_extern__ int
-inet_aifaddr(struct socket * so, const char * name,
- const struct in_addr * addr,
- const struct in_addr * mask,
- const struct in_addr * broadcast)
-{
- struct ifaliasreq ifra;
-
- bzero(&ifra, sizeof(ifra));
- strlcpy(ifra.ifra_name, name, sizeof(ifra.ifra_name));
- if (addr) {
- *((struct sockaddr_in *)(void *)&ifra.ifra_addr) = blank_sin;
- ((struct sockaddr_in *)(void *)&ifra.ifra_addr)->sin_addr = *addr;
- }
- if (mask) {
- *((struct sockaddr_in *)(void *)&ifra.ifra_mask) = blank_sin;
- ((struct sockaddr_in *)(void *)&ifra.ifra_mask)->sin_addr = *mask;
- }
- if (broadcast) {
- *((struct sockaddr_in *)(void *)&ifra.ifra_broadaddr) = blank_sin;
- ((struct sockaddr_in *)(void *)&ifra.ifra_broadaddr)->sin_addr = *broadcast;
- }
- return (ifioctl(so, SIOCAIFADDR, (caddr_t)&ifra, current_proc()));
-}
-
-
-struct dhcp_context {
- struct ifnet * ifp;
- struct sockaddr_dl * dl_p;
- struct ifreq ifr;
- struct socket * so;
- uint8_t request[DHCP_PACKET_MIN];
- dhcpoa_t request_options;
- uint8_t reply[DHCP_PAYLOAD_MIN];
- struct timeval start_time;
- uint32_t xid;
- int max_try;
- struct in_addr iaddr;
- struct in_addr netmask;
- struct in_addr router;
- struct in_addr server_id;
-};
-
-static __inline__ struct dhcp_packet *
-dhcp_context_request(struct dhcp_context * context)
-{
- return ((struct dhcp_packet *)(void *)context->request);
-}
-
-static __inline__ struct dhcp *
-dhcp_context_reply(struct dhcp_context * context)
-{
- return ((struct dhcp *)(void *)context->reply);
-}
-
-struct mbuf * ip_pkt_to_mbuf(caddr_t pkt, int pktsize);
-
-static int
-receive_packet(struct socket * so, void * pp, int psize,
- int * actual_size);
-
-/* ip address formatting macros */
-#define IP_FORMAT "%d.%d.%d.%d"
-#define IP_CH(ip) ((const uint8_t *)ip)
-#define IP_LIST(ip) IP_CH(ip)[0],IP_CH(ip)[1],IP_CH(ip)[2],IP_CH(ip)[3]
-
-#define SUGGESTED_LEASE_LENGTH (60 * 60 * 24 * 30 * 3) /* 3 months */
-
-static const uint8_t dhcp_params[] = {
- dhcptag_subnet_mask_e,
- dhcptag_router_e,
-};
-
-#define N_DHCP_PARAMS (sizeof(dhcp_params) / sizeof(dhcp_params[0]))
-
-static __inline__ long
-random_range(long bottom, long top)
-{
- long number = top - bottom + 1;
- long range_size = LONG_MAX / number;
- return (((long)random()) / range_size + bottom);
-}
-
-static void
-init_dhcp_packet_header(struct dhcp_packet * pkt, int pkt_size)
-{
- bzero(&pkt->ip, sizeof(pkt->ip));
- bzero(&pkt->udp, sizeof(pkt->udp));
- pkt->ip.ip_v = IPVERSION;
- pkt->ip.ip_hl = sizeof(struct ip) >> 2;
- pkt->ip.ip_ttl = MAXTTL;
- pkt->ip.ip_p = IPPROTO_UDP;
- pkt->ip.ip_src.s_addr = 0;
- pkt->ip.ip_dst.s_addr = htonl(INADDR_BROADCAST);
- pkt->ip.ip_len = htons(pkt_size);
- pkt->ip.ip_sum = 0;
- pkt->udp.uh_sport = htons(IPPORT_BOOTPC);
- pkt->udp.uh_dport = htons(IPPORT_BOOTPS);
- pkt->udp.uh_sum = 0;
- pkt->udp.uh_ulen = htons(pkt_size - sizeof(pkt->ip));
- return;
-}
-
-/*
- * Function: make_dhcp_request
- * Purpose:
- * Initialize the DHCP-specific parts of the message.
- */
-static void
-make_dhcp_request(struct dhcp * request, int request_size,
- dhcp_msgtype_t msg,
- const uint8_t * hwaddr, uint8_t hwtype, int hwlen,
- dhcpoa_t * options_p)
-{
- uint8_t cid[ETHER_ADDR_LEN + 1];
- uint8_t rfc_magic[RFC_MAGIC_SIZE] = RFC_OPTIONS_MAGIC;
-
- if (hwlen >= (int)sizeof(cid)) {
- printf("dhcp: hwlen is %d (> %d), truncating\n", hwlen,
- (int)sizeof(cid));
- hwlen = sizeof(cid) - 1;
- }
- bzero(request, request_size);
- request->dp_op = BOOTREQUEST;
- request->dp_htype = hwtype;
- request->dp_hlen = hwlen;
- bcopy(hwaddr, request->dp_chaddr, hwlen);
- bcopy(rfc_magic, request->dp_options, RFC_MAGIC_SIZE);
- dhcpoa_init(options_p, request->dp_options + RFC_MAGIC_SIZE,
- request_size - sizeof(struct dhcp) - RFC_MAGIC_SIZE);
- /* make the request a dhcp packet */
- dhcpoa_add_dhcpmsg(options_p, msg);
-
- /* add the list of required parameters */
- dhcpoa_add(options_p, dhcptag_parameter_request_list_e,
- N_DHCP_PARAMS, dhcp_params);
-
- /* add the DHCP client identifier */
- cid[0] = hwtype;
- bcopy(hwaddr, cid + 1, hwlen);
- dhcpoa_add(options_p, dhcptag_client_identifier_e, hwlen + 1, cid);
-
- return;
-}
-
-/*
- * Function: ip_pkt_to_mbuf
- * Purpose:
- * Put the given IP packet into an mbuf, calculate the
- * IP checksum.
- */
-struct mbuf *
-ip_pkt_to_mbuf(caddr_t pkt, int pktsize)
-{
- struct ip * ip;
- struct mbuf * m;
-
- m = (struct mbuf *)m_devget(pkt, pktsize, 0, NULL, NULL);
- if (m == 0) {
- printf("dhcp: ip_pkt_to_mbuf: m_devget failed\n");
- return NULL;
- }
- m->m_flags |= M_BCAST;
- /* Compute the checksum */
- ip = mtod(m, struct ip *);
- ip->ip_sum = 0;
- ip->ip_sum = in_cksum(m, sizeof(struct ip));
- return (m);
-}
-
-static __inline__ u_char *
-link_address(struct sockaddr_dl * dl_p)
-{
- return (u_char *)(dl_p->sdl_data + dl_p->sdl_nlen);
-}
-
-static __inline__ int
-link_address_length(struct sockaddr_dl * dl_p)
-{
- return (dl_p->sdl_alen);
-}
-
-static __inline__ void
-link_print(struct sockaddr_dl * dl_p)
-{
- int i;
-
- for (i = 0; i < dl_p->sdl_alen; i++)
- printf("%s%x", i ? ":" : "",
- (link_address(dl_p))[i]);
- printf("\n");
- return;
-}
-
-static struct sockaddr_dl *
-link_from_ifnet(struct ifnet * ifp)
-{
- return ((struct sockaddr_dl *)(void *)ifp->if_lladdr->ifa_addr);
-}
-
-/*
- * Function: send_packet
- * Purpose:
- * Send the request directly on the interface, bypassing the routing code.
- */
-static int
-send_packet(struct ifnet * ifp, struct dhcp_packet * pkt, int pkt_size)
-{
- struct mbuf * m;
- struct sockaddr_in dest;
-
- dest = blank_sin;
- dest.sin_port = htons(IPPORT_BOOTPS);
- dest.sin_addr.s_addr = INADDR_BROADCAST;
- m = ip_pkt_to_mbuf((caddr_t)pkt, pkt_size);
- return dlil_output(ifp, PF_INET, m, 0, (struct sockaddr *)&dest, 0, NULL);
-}
-
-/*
- * Function: receive_packet
- * Purpose:
- * Return a received packet or an error if none available.
- */
-static int
-receive_packet(struct socket * so, void * pp, int psize, int * actual_size)
-{
- uio_t auio;
- int error;
- int rcvflg;
- char uio_buf[ UIO_SIZEOF(1) ];
-
- auio = uio_createwithbuffer(1, 0, UIO_SYSSPACE, UIO_READ,
- &uio_buf[0], sizeof(uio_buf));
- uio_addiov(auio, CAST_USER_ADDR_T(pp), psize);
- rcvflg = MSG_WAITALL;
-
- error = soreceive(so, (struct sockaddr **) 0, auio, 0, 0, &rcvflg);
- *actual_size = psize - uio_resid(auio);
- return (error);
-}
-
-/*
- * Function: dhcp_timeout
- * Purpose:
- * Wakeup the process waiting for something on a socket.
- */
-static void
-dhcp_timeout(void * arg)
-{
- struct socket * * timer_arg = (struct socket * *)arg;
- struct socket * so = *timer_arg;
-
- dprintf(("dhcp: timeout\n"));
-
- *timer_arg = NULL;
- socket_lock(so, 1);
- sowakeup(so, &so->so_rcv);
- socket_unlock(so, 1);
- return;
-}
-
-/*
- * Function: rate_packet
- * Purpose:
- * Return an integer point rating value for the given dhcp packet.
- * If yiaddr non-zero, the packet gets a rating of 1.
- * Another point is given if the packet contains the subnet mask,
- * and another if the router is present.
- */
-#define GOOD_RATING 3
-static __inline__ int
-rate_packet(dhcpol_t * options_p)
-{
- int len;
- int rating = 1;
-
- if (dhcpol_find(options_p, dhcptag_subnet_mask_e, &len, NULL) != NULL) {
- rating++;
- }
- if (dhcpol_find(options_p, dhcptag_router_e, &len, NULL) != NULL) {
- rating++;
- }
- return (rating);
-}
-
-static dhcp_msgtype_t
-get_dhcp_msgtype(dhcpol_t * options_p)
-{
- int len;
- const uint8_t * opt;
-
- opt = dhcpol_find(options_p, dhcptag_dhcp_message_type_e, &len, NULL);
- if (opt != NULL && len == 1) {
- return (*opt);
- }
- return (dhcp_msgtype_none_e);
-}
-
-static int
-dhcp_get_ack(struct dhcp_context * context, int wait_ticks)
-{
- int error = 0;
- const struct in_addr * ip;
- int len;
- int n;
- struct dhcp * reply;
- struct in_addr server_id;
- struct socket * timer_arg;
-
- timer_arg = context->so;
- reply = dhcp_context_reply(context);
- timeout((timeout_fcn_t)dhcp_timeout, &timer_arg, wait_ticks);
- while (1) {
- error = receive_packet(context->so, context->reply,
- sizeof(context->reply), &n);
- if (error == 0) {
- dhcp_msgtype_t msg;
- dhcpol_t options;
-
- dprintf(("\ndhcp: received packet length %d\n", n));
- if (n < (int)sizeof(struct dhcp)) {
- dprintf(("dhcp: packet is too short %d < %d\n",
- n, (int)sizeof(struct dhcp)));
- continue;
- }
- if (ntohl(reply->dp_xid) != context->xid
- || bcmp(reply->dp_chaddr, link_address(context->dl_p),
- link_address_length(context->dl_p)) != 0) {
- /* not for us */
- continue;
- }
- (void)dhcpol_parse_packet(&options, reply, n);
- server_id.s_addr = 0;
- ip = (const struct in_addr *)
- dhcpol_find(&options,
- dhcptag_server_identifier_e, &len, NULL);
- if (ip != NULL && len >= (int)sizeof(*ip)) {
- server_id = *ip;
- }
- msg = get_dhcp_msgtype(&options);
- if (msg == dhcp_msgtype_nak_e
- && server_id.s_addr == context->server_id.s_addr) {
- /* server NAK'd us, start over */
- dhcpol_free(&options);
- error = EPROTO;
- untimeout((timeout_fcn_t)dhcp_timeout, &timer_arg);
- break;
- }
- if (msg != dhcp_msgtype_ack_e
- || reply->dp_yiaddr.s_addr == 0
- || reply->dp_yiaddr.s_addr == INADDR_BROADCAST) {
- /* ignore the packet */
- goto next_packet;
- }
- printf("dhcp: received ACK: server " IP_FORMAT
- " IP address " IP_FORMAT "\n",
- IP_LIST(&server_id), IP_LIST(&reply->dp_yiaddr));
- context->iaddr = reply->dp_yiaddr;
- ip = (const struct in_addr *)
- dhcpol_find(&options,
- dhcptag_subnet_mask_e, &len, NULL);
- if (ip != NULL && len >= (int)sizeof(*ip)) {
- context->netmask = *ip;
- }
- ip = (const struct in_addr *)
- dhcpol_find(&options, dhcptag_router_e, &len, NULL);
- if (ip != NULL && len >= (int)sizeof(*ip)) {
- context->router = *ip;
- }
- dhcpol_free(&options);
- untimeout((timeout_fcn_t)dhcp_timeout, &timer_arg);
- break;
-
- next_packet:
- dhcpol_free(&options);
- }
- else if ((error != EWOULDBLOCK)) {
- /* if some other error occurred, we're done */
- untimeout((timeout_fcn_t)dhcp_timeout, &timer_arg);
- break;
- }
- else if (timer_arg == NULL) {
- /* timed out */
- break;
- }
- else {
- /* wait for a wait to arrive, or a timeout to occur */
- socket_lock(context->so, 1);
- error = sbwait(&context->so->so_rcv);
- socket_unlock(context->so, 1);
- }
- }
- return (error);
-}
-
-static int
-dhcp_select(struct dhcp_context * context)
-{
- struct timeval current_time;
- int error = 0;
- dhcpoa_t * options_p;
- struct dhcp_packet * request;
- int request_size;
- int retry;
- int wait_ticks;
-
- /* format a DHCP Request packet */
- request = dhcp_context_request(context);
- options_p = &context->request_options;
-
- make_dhcp_request(&request->dhcp, DHCP_PAYLOAD_MIN,
- dhcp_msgtype_request_e,
- link_address(context->dl_p), ARPHRD_ETHER,
- link_address_length(context->dl_p),
- options_p);
- /* insert server identifier and requested ip address */
- dhcpoa_add(options_p, dhcptag_requested_ip_address_e,
- sizeof(context->iaddr), &context->iaddr);
- dhcpoa_add(options_p, dhcptag_server_identifier_e,
- sizeof(context->server_id), &context->server_id);
- dhcpoa_add(options_p, dhcptag_end_e, 0, 0);
- request_size = sizeof(*request) + RFC_MAGIC_SIZE
- + dhcpoa_used(options_p);
- if (request_size < (int)sizeof(struct bootp_packet)) {
- /* pad out to BOOTP-sized packet */
- request_size = sizeof(struct bootp_packet);
- }
- init_dhcp_packet_header(request, request_size);
-
- wait_ticks = INITIAL_WAIT_SECS * hz;
-#define SELECT_RETRY_COUNT 3
- for (retry = 0; retry < SELECT_RETRY_COUNT; retry++) {
- /* Send the request */
- printf("dhcp: sending REQUEST: server " IP_FORMAT
- " IP address " IP_FORMAT "\n",
- IP_LIST(&context->server_id),
- IP_LIST(&context->iaddr));
- microtime(¤t_time);
- request->dhcp.dp_secs
- = htons((u_short)
- (current_time.tv_sec - context->start_time.tv_sec));
- request->dhcp.dp_xid = htonl(context->xid);
- request->ip.ip_id = ip_randomid();
- error = send_packet(context->ifp, request, request_size);
- if (error != 0) {
- printf("dhcp: send_packet failed with %d\n", error);
- goto failed;
- }
-
- wait_ticks += random_range(-RAND_TICKS, RAND_TICKS);
- dprintf(("dhcp: waiting %d ticks\n", wait_ticks));
- error = dhcp_get_ack(context, wait_ticks);
- switch (error) {
- case 0:
- /* we're done */
- goto done;
- case EPROTO:
- printf("dhcp: server " IP_FORMAT " send us a NAK\n",
- IP_LIST(&context->server_id));
- goto failed;
- case EWOULDBLOCK:
- break;
- default:
- dprintf(("dhcp: failed to receive packets: %d\n", error));
- goto failed;
- }
- wait_ticks *= 2;
- if (wait_ticks > (MAX_WAIT_SECS * hz))
- wait_ticks = MAX_WAIT_SECS * hz;
- microtime(¤t_time);
- }
- error = ETIMEDOUT;
- goto failed;
-
- done:
- error = 0;
-
- failed:
- return (error);
-}
-
-static int
-dhcp_get_offer(struct dhcp_context * context, int wait_ticks)
-{
- int error = 0;
- int gather_count = 0;
- const struct in_addr * ip;
- int last_rating = 0;
- int len;
- int n;
- int rating;
- struct dhcp * reply;
- struct in_addr server_id;
- struct socket * timer_arg;
-
- timer_arg = context->so;
- reply = dhcp_context_reply(context);
- timeout((timeout_fcn_t)dhcp_timeout, &timer_arg, wait_ticks);
- while (1) {
- error = receive_packet(context->so, context->reply,
- sizeof(context->reply), &n);
- if (error == 0) {
- dhcpol_t options;
-
- dprintf(("\ndhcp: received packet length %d\n", n));
- if (n < (int)sizeof(struct dhcp)) {
- dprintf(("dhcp: packet is too short %d < %d\n",
- n, (int)sizeof(struct dhcp)));
- continue;
- }
- if (ntohl(reply->dp_xid) != context->xid
- || reply->dp_yiaddr.s_addr == 0
- || reply->dp_yiaddr.s_addr == INADDR_BROADCAST
- || bcmp(reply->dp_chaddr,
- link_address(context->dl_p),
- link_address_length(context->dl_p)) != 0) {
- /* not for us */
- continue;
- }
- (void)dhcpol_parse_packet(&options, reply, n);
- if (get_dhcp_msgtype(&options) != dhcp_msgtype_offer_e) {
- /* not an offer */
- goto next_packet;
- }
- ip = (const struct in_addr *)
- dhcpol_find(&options,
- dhcptag_server_identifier_e, &len, NULL);
- if (ip == NULL || len < (int)sizeof(*ip)) {
- /* missing/invalid server identifier */
- goto next_packet;
- }
- printf("dhcp: received OFFER: server " IP_FORMAT
- " IP address " IP_FORMAT "\n",
- IP_LIST(ip), IP_LIST(&reply->dp_yiaddr));
- server_id = *ip;
- rating = rate_packet(&options);
- if (rating > last_rating) {
- context->iaddr = reply->dp_yiaddr;
- ip = (const struct in_addr *)
- dhcpol_find(&options,
- dhcptag_subnet_mask_e, &len, NULL);
- if (ip != NULL && len >= (int)sizeof(*ip)) {
- context->netmask = *ip;
- }
- ip = (const struct in_addr *)
- dhcpol_find(&options, dhcptag_router_e, &len, NULL);
- if (ip != NULL && len >= (int)sizeof(*ip)) {
- context->router = *ip;
- }
- context->server_id = server_id;
- }
- if (rating >= GOOD_RATING) {
- dhcpol_free(&options);
- /* packet is good enough */
- untimeout((timeout_fcn_t)dhcp_timeout, &timer_arg);
- break;
- }
- if (gather_count == 0) {
- untimeout((timeout_fcn_t)dhcp_timeout, &timer_arg);
- timer_arg = context->so;
- timeout((timeout_fcn_t)dhcp_timeout, &timer_arg,
- hz * GATHER_TIME_SECS);
- }
- gather_count = 1;
- next_packet:
- dhcpol_free(&options);
- }
- else if ((error != EWOULDBLOCK)) {
- untimeout((timeout_fcn_t)dhcp_timeout, &timer_arg);
- break;
- }
- else if (timer_arg == NULL) { /* timed out */
- if (gather_count != 0) {
- dprintf(("dhcp: gathering time has expired\n"));
- error = 0;
- }
- break;
- }
- else {
- socket_lock(context->so, 1);
- error = sbwait(&context->so->so_rcv);
- socket_unlock(context->so, 1);
- }
- }
- return (error);
-}
-
-/*
- * Function: dhcp_init
- * Purpose:
- * Start in the DHCP INIT state sending DISCOVER's. When we get OFFER's,
- * try to select one of them by sending a REQUEST and waiting for an ACK.
- */
-static int
-dhcp_init(struct dhcp_context * context)
-{
- struct timeval current_time;
- int error = 0;
- uint32_t lease_option = htonl(SUGGESTED_LEASE_LENGTH);
- dhcpoa_t * options_p;
- struct dhcp_packet * request;
- int request_size;
- int retry;
- int wait_ticks;
-
- /* remember the time we started */
- microtime(&context->start_time);
- current_time = context->start_time;
-
- request = dhcp_context_request(context);
- options_p = &context->request_options;
-
- retry:
- /* format a DHCP DISCOVER packet */
- make_dhcp_request(&request->dhcp, DHCP_PAYLOAD_MIN,
- dhcp_msgtype_discover_e,
- link_address(context->dl_p), ARPHRD_ETHER,
- link_address_length(context->dl_p),
- options_p);
- /* add the requested lease time */
- dhcpoa_add(options_p, dhcptag_lease_time_e,
- sizeof(lease_option), &lease_option);
- dhcpoa_add(options_p, dhcptag_end_e, 0, 0);
- request_size = sizeof(*request) + RFC_MAGIC_SIZE
- + dhcpoa_used(options_p);
- if (request_size < (int)sizeof(struct bootp_packet)) {
- /* pad out to BOOTP-sized packet */
- request_size = sizeof(struct bootp_packet);
- }
- init_dhcp_packet_header(request, request_size);
-
- wait_ticks = INITIAL_WAIT_SECS * hz;
- for (retry = 0; retry < context->max_try; retry++) {
- /* Send the request */
- printf("dhcp: sending DISCOVER\n");
- request->dhcp.dp_secs
- = htons((u_short)(current_time.tv_sec
- - context->start_time.tv_sec));
- request->dhcp.dp_xid = htonl(context->xid);
- request->ip.ip_id = ip_randomid();
- error = send_packet(context->ifp, request, request_size);
- if (error != 0) {
- printf("dhcp: send_packet failed with %d\n", error);
- goto failed;
- }
- wait_ticks += random_range(-RAND_TICKS, RAND_TICKS);
- dprintf(("dhcp: waiting %d ticks\n", wait_ticks));
- error = dhcp_get_offer(context, wait_ticks);
- if (error == 0) {
- /* send a REQUEST */
- error = dhcp_select(context);
- if (error == 0) {
- /* we're done !*/
- goto done;
- }
- if (error != EPROTO && error != ETIMEDOUT) {
- /* fatal error */
- dprintf(("dhcp: dhcp_select failed %d\n", error));
- goto failed;
- }
- /* wait 10 seconds, and try again */
- printf("dhcp: trying again in 10 seconds\n");
- tsleep(&error, PRIBIO, "dhcp_init", 10 * hz);
- context->xid++;
- goto retry;
- }
- else if (error != EWOULDBLOCK) {
- dprintf(("dhcp: failed to receive packets: %d\n", error));
- goto failed;
- }
- wait_ticks *= 2;
- if (wait_ticks > (MAX_WAIT_SECS * hz))
- wait_ticks = MAX_WAIT_SECS * hz;
- microtime(¤t_time);
- }
- error = ETIMEDOUT;
- goto failed;
-
- done:
- error = 0;
-
- failed:
- return (error);
-}
-
-static void
-dhcp_context_free(struct dhcp_context * context, struct proc * procp)
-{
- if (context == NULL) {
- return;
- }
- if (context->so != NULL) {
- int error;
-
- /* disable reception of DHCP packets before address assignment */
- context->ifr.ifr_intval = 0;
- error = ifioctl(context->so, SIOCAUTOADDR,
- (caddr_t)&context->ifr, procp);
- if (error) {
- printf("dhcp: SIOCAUTOADDR failed: %d\n", error);
- }
- soclose(context->so);
- }
- kfree(context, sizeof(*context));
- return;
-}
-
-static struct dhcp_context *
-dhcp_context_create(struct ifnet * ifp, int max_try,
- struct proc * procp, int * error_p)
-{
- struct dhcp_context * context = NULL;
- struct sockaddr_dl * dl_p;
- struct in_addr lo_addr;
- struct in_addr lo_mask;
- int error;
- struct sockaddr_in sin;
-
- /* get the hardware address from the interface */
- dl_p = link_from_ifnet(ifp);
- if (dl_p == NULL) {
- printf("dhcp: can't get link address\n");
- error = ENXIO;
- goto failed;
- }
-
- printf("dhcp: h/w addr ");
- link_print(dl_p);
- if (dl_p->sdl_type != IFT_ETHER) {
- printf("dhcp: hardware type %d not supported\n",
- dl_p->sdl_type);
- error = ENXIO;
- goto failed;
- }
-
- context = (struct dhcp_context *)kalloc(sizeof(*context));
- if (context == NULL) {
- printf("dhcp: failed to allocate context\n");
- error = ENOMEM;
- goto failed;
- }
- bzero(context, sizeof(*context));
-
- /* get a socket */
- error = socreate(AF_INET, &context->so, SOCK_DGRAM, 0);
- if (error != 0) {
- printf("dhcp: socreate failed %d\n", error);
- goto failed;
- }
-
- /* assign 127.0.0.1 to lo0 so that the bind will succeed */
- lo_addr.s_addr = htonl(INADDR_LOOPBACK);
- lo_mask.s_addr = htonl(IN_CLASSA_NET);
- error = inet_aifaddr(context->so, "lo0", &lo_addr, &lo_mask, NULL);
- if (error != 0) {
- printf("dhcp: assigning loopback address failed %d\n", error);
- }
-
- /* enable reception of DHCP packets before an address is assigned */
- snprintf(context->ifr.ifr_name,
- sizeof(context->ifr.ifr_name), "%s", if_name(ifp));
- context->ifr.ifr_intval = 1;
-
- error = ifioctl(context->so, SIOCAUTOADDR, (caddr_t)&context->ifr, procp);
- if (error) {
- printf("dhcp: SIOCAUTOADDR failed: %d\n", error);
- goto failed;
- }
- dprintf(("dhcp: SIOCAUTOADDR done\n"));
-
- error = ifioctl(context->so, SIOCPROTOATTACH, (caddr_t)&context->ifr,
- procp);
- if (error) {
- printf("dhcp: SIOCPROTOATTACH failed: %d\n", error);
- goto failed;
- }
- dprintf(("dhcp: SIOCPROTOATTACH done\n"));
-
- /* bind the socket */
- sin.sin_len = sizeof(sin);
- sin.sin_family = AF_INET;
- sin.sin_port = htons(IPPORT_BOOTPC);
- sin.sin_addr.s_addr = INADDR_ANY;
- error = sobindlock(context->so, (struct sockaddr *)&sin, 1);
- if (error) {
- printf("dhcp: sobind failed, %d\n", error);
- goto failed;
- }
-
- /* make it non-blocking I/O */
- socket_lock(context->so, 1);
- context->so->so_state |= SS_NBIO;
- socket_unlock(context->so, 1);
-
- /* save passed-in information */
- context->max_try = max_try;
- context->dl_p = dl_p;
- context->ifp = ifp;
-
- /* get a random transaction id */
- context->xid = random();
-
- return (context);
-
- failed:
- dhcp_context_free(context, procp);
- *error_p = error;
- return (NULL);
-}
-
-/*
- * Routine: dhcp
- * Function:
- * Do DHCP over the specified interface to retrieve the IP address,
- * subnet mask, and router.
- */
-int
-dhcp(struct ifnet * ifp, struct in_addr * iaddr_p, int max_try,
- struct in_addr * netmask_p, struct in_addr * router_p,
- struct proc * procp)
-{
- int error = 0;
- struct dhcp_context * context;
-
- context = dhcp_context_create(ifp, max_try, procp, &error);
- if (context == NULL) {
- return (error);
- }
-
- /* start DHCP in the INIT state */
- error = dhcp_init(context);
- if (error == 0) {
- *iaddr_p = context->iaddr;
- *netmask_p = context->netmask;
- *router_p = context->router;
- }
- dhcp_context_free(context, procp);
- return (error);
-}
projects / apple / xnu.git / blobdiff