diff options
Diffstat (limited to 'qemu/roms/ipxe/src/net/udp/dhcp.c')
| -rw-r--r-- | qemu/roms/ipxe/src/net/udp/dhcp.c | 1497 |
1 files changed, 0 insertions, 1497 deletions
diff --git a/qemu/roms/ipxe/src/net/udp/dhcp.c b/qemu/roms/ipxe/src/net/udp/dhcp.c deleted file mode 100644 index aed5ee360..000000000 --- a/qemu/roms/ipxe/src/net/udp/dhcp.c +++ /dev/null @@ -1,1497 +0,0 @@ -/* - * Copyright (C) 2006 Michael Brown <mbrown@fensystems.co.uk>. - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License as - * published by the Free Software Foundation; either version 2 of the - * License, or any later version. - * - * This program is distributed in the hope that it will be useful, but - * WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA - * 02110-1301, USA. - * - * You can also choose to distribute this program under the terms of - * the Unmodified Binary Distribution Licence (as given in the file - * COPYING.UBDL), provided that you have satisfied its requirements. - */ - -FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL ); - -#include <string.h> -#include <stdlib.h> -#include <stdio.h> -#include <ctype.h> -#include <errno.h> -#include <assert.h> -#include <byteswap.h> -#include <ipxe/if_ether.h> -#include <ipxe/iobuf.h> -#include <ipxe/netdevice.h> -#include <ipxe/device.h> -#include <ipxe/xfer.h> -#include <ipxe/open.h> -#include <ipxe/job.h> -#include <ipxe/retry.h> -#include <ipxe/tcpip.h> -#include <ipxe/ip.h> -#include <ipxe/uuid.h> -#include <ipxe/timer.h> -#include <ipxe/settings.h> -#include <ipxe/dhcp.h> -#include <ipxe/dhcpopts.h> -#include <ipxe/dhcppkt.h> -#include <ipxe/dhcp_arch.h> -#include <ipxe/features.h> -#include <config/dhcp.h> - -/** @file - * - * Dynamic Host Configuration Protocol - * - */ - -struct dhcp_session; -static int dhcp_tx ( struct dhcp_session *dhcp ); - -/** - * DHCP operation types - * - * This table maps from DHCP message types (i.e. values of the @c - * DHCP_MESSAGE_TYPE option) to values of the "op" field within a DHCP - * packet. - */ -static const uint8_t dhcp_op[] = { - [DHCPDISCOVER] = BOOTP_REQUEST, - [DHCPOFFER] = BOOTP_REPLY, - [DHCPREQUEST] = BOOTP_REQUEST, - [DHCPDECLINE] = BOOTP_REQUEST, - [DHCPACK] = BOOTP_REPLY, - [DHCPNAK] = BOOTP_REPLY, - [DHCPRELEASE] = BOOTP_REQUEST, - [DHCPINFORM] = BOOTP_REQUEST, -}; - -/** Raw option data for options common to all DHCP requests */ -static uint8_t dhcp_request_options_data[] = { - DHCP_MESSAGE_TYPE, DHCP_BYTE ( 0 ), - DHCP_MAX_MESSAGE_SIZE, - DHCP_WORD ( ETH_MAX_MTU - 20 /* IP header */ - 8 /* UDP header */ ), - DHCP_CLIENT_ARCHITECTURE, DHCP_ARCH_CLIENT_ARCHITECTURE, - DHCP_CLIENT_NDI, DHCP_ARCH_CLIENT_NDI, - DHCP_VENDOR_CLASS_ID, DHCP_ARCH_VENDOR_CLASS_ID, - DHCP_USER_CLASS_ID, DHCP_STRING ( 'i', 'P', 'X', 'E' ), - DHCP_PARAMETER_REQUEST_LIST, - DHCP_OPTION ( DHCP_SUBNET_MASK, DHCP_ROUTERS, DHCP_DNS_SERVERS, - DHCP_LOG_SERVERS, DHCP_HOST_NAME, DHCP_DOMAIN_NAME, - DHCP_ROOT_PATH, DHCP_VENDOR_ENCAP, DHCP_VENDOR_CLASS_ID, - DHCP_TFTP_SERVER_NAME, DHCP_BOOTFILE_NAME, - DHCP_DOMAIN_SEARCH, - 128, 129, 130, 131, 132, 133, 134, 135, /* for PXE */ - DHCP_EB_ENCAP, DHCP_ISCSI_INITIATOR_IQN ), - DHCP_END -}; - -/** DHCP server address setting */ -const struct setting dhcp_server_setting __setting ( SETTING_MISC, - dhcp-server ) = { - .name = "dhcp-server", - .description = "DHCP server", - .tag = DHCP_SERVER_IDENTIFIER, - .type = &setting_type_ipv4, -}; - -/** - * Most recent DHCP transaction ID - * - * This is exposed for use by the fakedhcp code when reconstructing - * DHCP packets for PXE NBPs. - */ -uint32_t dhcp_last_xid; - -/** - * Name a DHCP packet type - * - * @v msgtype DHCP message type - * @ret string DHCP mesasge type name - */ -static inline const char * dhcp_msgtype_name ( unsigned int msgtype ) { - switch ( msgtype ) { - case DHCPNONE: return "BOOTP"; /* Non-DHCP packet */ - case DHCPDISCOVER: return "DHCPDISCOVER"; - case DHCPOFFER: return "DHCPOFFER"; - case DHCPREQUEST: return "DHCPREQUEST"; - case DHCPDECLINE: return "DHCPDECLINE"; - case DHCPACK: return "DHCPACK"; - case DHCPNAK: return "DHCPNAK"; - case DHCPRELEASE: return "DHCPRELEASE"; - case DHCPINFORM: return "DHCPINFORM"; - default: return "DHCP<invalid>"; - } -} - -/**************************************************************************** - * - * DHCP session - * - */ - -struct dhcp_session; - -/** DHCP session state operations */ -struct dhcp_session_state { - /** State name */ - const char *name; - /** - * Construct transmitted packet - * - * @v dhcp DHCP session - * @v dhcppkt DHCP packet - * @v peer Destination address - */ - int ( * tx ) ( struct dhcp_session *dhcp, struct dhcp_packet *dhcppkt, - struct sockaddr_in *peer ); - /** - * Handle received packet - * - * @v dhcp DHCP session - * @v dhcppkt DHCP packet - * @v peer DHCP server address - * @v msgtype DHCP message type - * @v server_id DHCP server ID - * @v pseudo_id DHCP server pseudo-ID - */ - void ( * rx ) ( struct dhcp_session *dhcp, struct dhcp_packet *dhcppkt, - struct sockaddr_in *peer, uint8_t msgtype, - struct in_addr server_id, struct in_addr pseudo_id ); - /** - * Handle timer expiry - * - * @v dhcp DHCP session - */ - void ( * expired ) ( struct dhcp_session *dhcp ); - /** Transmitted message type */ - uint8_t tx_msgtype; - /** Timeout parameters */ - uint8_t min_timeout_sec; - uint8_t max_timeout_sec; -}; - -static struct dhcp_session_state dhcp_state_discover; -static struct dhcp_session_state dhcp_state_request; -static struct dhcp_session_state dhcp_state_proxy; -static struct dhcp_session_state dhcp_state_pxebs; - -/** A DHCP session */ -struct dhcp_session { - /** Reference counter */ - struct refcnt refcnt; - /** Job control interface */ - struct interface job; - /** Data transfer interface */ - struct interface xfer; - - /** Network device being configured */ - struct net_device *netdev; - /** Local socket address */ - struct sockaddr_in local; - /** State of the session */ - struct dhcp_session_state *state; - /** Transaction ID (in network-endian order) */ - uint32_t xid; - - /** Offered IP address */ - struct in_addr offer; - /** DHCP server */ - struct in_addr server; - /** DHCP offer priority */ - int priority; - - /** ProxyDHCP protocol extensions should be ignored */ - int no_pxedhcp; - /** ProxyDHCP server */ - struct in_addr proxy_server; - /** ProxyDHCP offer */ - struct dhcp_packet *proxy_offer; - /** ProxyDHCP offer priority */ - int proxy_priority; - - /** PXE Boot Server type */ - uint16_t pxe_type; - /** List of PXE Boot Servers to attempt */ - struct in_addr *pxe_attempt; - /** List of PXE Boot Servers to accept */ - struct in_addr *pxe_accept; - - /** Retransmission timer */ - struct retry_timer timer; - /** Transmission counter */ - unsigned int count; - /** Start time of the current state (in ticks) */ - unsigned long start; -}; - -/** - * Free DHCP session - * - * @v refcnt Reference counter - */ -static void dhcp_free ( struct refcnt *refcnt ) { - struct dhcp_session *dhcp = - container_of ( refcnt, struct dhcp_session, refcnt ); - - netdev_put ( dhcp->netdev ); - dhcppkt_put ( dhcp->proxy_offer ); - free ( dhcp ); -} - -/** - * Mark DHCP session as complete - * - * @v dhcp DHCP session - * @v rc Return status code - */ -static void dhcp_finished ( struct dhcp_session *dhcp, int rc ) { - - /* Stop retry timer */ - stop_timer ( &dhcp->timer ); - - /* Shut down interfaces */ - intf_shutdown ( &dhcp->xfer, rc ); - intf_shutdown ( &dhcp->job, rc ); -} - -/** - * Transition to new DHCP session state - * - * @v dhcp DHCP session - * @v state New session state - */ -static void dhcp_set_state ( struct dhcp_session *dhcp, - struct dhcp_session_state *state ) { - - DBGC ( dhcp, "DHCP %p entering %s state\n", dhcp, state->name ); - dhcp->state = state; - dhcp->start = currticks(); - stop_timer ( &dhcp->timer ); - set_timer_limits ( &dhcp->timer, - ( state->min_timeout_sec * TICKS_PER_SEC ), - ( state->max_timeout_sec * TICKS_PER_SEC ) ); - start_timer_nodelay ( &dhcp->timer ); -} - -/** - * Check if DHCP packet contains PXE options - * - * @v dhcppkt DHCP packet - * @ret has_pxeopts DHCP packet contains PXE options - * - * It is assumed that the packet is already known to contain option 60 - * set to "PXEClient". - */ -static int dhcp_has_pxeopts ( struct dhcp_packet *dhcppkt ) { - - /* Check for a boot filename */ - if ( dhcppkt_fetch ( dhcppkt, DHCP_BOOTFILE_NAME, NULL, 0 ) > 0 ) - return 1; - - /* Check for a PXE boot menu */ - if ( dhcppkt_fetch ( dhcppkt, DHCP_PXE_BOOT_MENU, NULL, 0 ) > 0 ) - return 1; - - return 0; -} - -/**************************************************************************** - * - * DHCP state machine - * - */ - -/** - * Construct transmitted packet for DHCP discovery - * - * @v dhcp DHCP session - * @v dhcppkt DHCP packet - * @v peer Destination address - */ -static int dhcp_discovery_tx ( struct dhcp_session *dhcp, - struct dhcp_packet *dhcppkt __unused, - struct sockaddr_in *peer ) { - - DBGC ( dhcp, "DHCP %p DHCPDISCOVER\n", dhcp ); - - /* Set server address */ - peer->sin_addr.s_addr = INADDR_BROADCAST; - peer->sin_port = htons ( BOOTPS_PORT ); - - return 0; -} - -/** - * Handle received packet during DHCP discovery - * - * @v dhcp DHCP session - * @v dhcppkt DHCP packet - * @v peer DHCP server address - * @v msgtype DHCP message type - * @v server_id DHCP server ID - * @v pseudo_id DHCP server pseudo-ID - */ -static void dhcp_discovery_rx ( struct dhcp_session *dhcp, - struct dhcp_packet *dhcppkt, - struct sockaddr_in *peer, uint8_t msgtype, - struct in_addr server_id, - struct in_addr pseudo_id ) { - struct in_addr ip; - char vci[9]; /* "PXEClient" */ - int vci_len; - int has_pxeclient; - int8_t priority = 0; - uint8_t no_pxedhcp = 0; - unsigned long elapsed; - - DBGC ( dhcp, "DHCP %p %s from %s:%d", dhcp, - dhcp_msgtype_name ( msgtype ), inet_ntoa ( peer->sin_addr ), - ntohs ( peer->sin_port ) ); - if ( ( server_id.s_addr != peer->sin_addr.s_addr ) || - ( pseudo_id.s_addr != peer->sin_addr.s_addr ) ) { - DBGC ( dhcp, " (%s/", inet_ntoa ( server_id ) ); - DBGC ( dhcp, "%s)", inet_ntoa ( pseudo_id ) ); - } - - /* Identify offered IP address */ - ip = dhcppkt->dhcphdr->yiaddr; - if ( ip.s_addr ) - DBGC ( dhcp, " for %s", inet_ntoa ( ip ) ); - - /* Identify "PXEClient" vendor class */ - vci_len = dhcppkt_fetch ( dhcppkt, DHCP_VENDOR_CLASS_ID, - vci, sizeof ( vci ) ); - has_pxeclient = ( ( vci_len >= ( int ) sizeof ( vci ) ) && - ( strncmp ( "PXEClient", vci, sizeof (vci) ) == 0 )); - if ( has_pxeclient ) { - DBGC ( dhcp, "%s", - ( dhcp_has_pxeopts ( dhcppkt ) ? " pxe" : " proxy" ) ); - } - - /* Identify priority */ - dhcppkt_fetch ( dhcppkt, DHCP_EB_PRIORITY, &priority, - sizeof ( priority ) ); - if ( priority ) - DBGC ( dhcp, " pri %d", priority ); - - /* Identify ignore-PXE flag */ - dhcppkt_fetch ( dhcppkt, DHCP_EB_NO_PXEDHCP, &no_pxedhcp, - sizeof ( no_pxedhcp ) ); - if ( no_pxedhcp ) - DBGC ( dhcp, " nopxe" ); - DBGC ( dhcp, "\n" ); - - /* Select as DHCP offer, if applicable */ - if ( ip.s_addr && ( peer->sin_port == htons ( BOOTPS_PORT ) ) && - ( ( msgtype == DHCPOFFER ) || ( ! msgtype /* BOOTP */ ) ) && - ( priority >= dhcp->priority ) ) { - dhcp->offer = ip; - dhcp->server = server_id; - dhcp->priority = priority; - dhcp->no_pxedhcp = no_pxedhcp; - } - - /* Select as ProxyDHCP offer, if applicable */ - if ( pseudo_id.s_addr && has_pxeclient && - ( priority >= dhcp->proxy_priority ) ) { - dhcppkt_put ( dhcp->proxy_offer ); - dhcp->proxy_server = pseudo_id; - dhcp->proxy_offer = dhcppkt_get ( dhcppkt ); - dhcp->proxy_priority = priority; - } - - /* We can exit the discovery state when we have a valid - * DHCPOFFER, and either: - * - * o The DHCPOFFER instructs us to ignore ProxyDHCPOFFERs, or - * o We have a valid ProxyDHCPOFFER, or - * o We have allowed sufficient time for ProxyDHCPOFFERs. - */ - - /* If we don't yet have a DHCPOFFER, do nothing */ - if ( ! dhcp->offer.s_addr ) - return; - - /* If we can't yet transition to DHCPREQUEST, do nothing */ - elapsed = ( currticks() - dhcp->start ); - if ( ! ( dhcp->no_pxedhcp || dhcp->proxy_offer || - ( elapsed > DHCP_DISC_PROXY_TIMEOUT_SEC * TICKS_PER_SEC ) ) ) - return; - - /* Transition to DHCPREQUEST */ - dhcp_set_state ( dhcp, &dhcp_state_request ); -} - -/** - * Handle timer expiry during DHCP discovery - * - * @v dhcp DHCP session - */ -static void dhcp_discovery_expired ( struct dhcp_session *dhcp ) { - unsigned long elapsed = ( currticks() - dhcp->start ); - - /* If link is blocked, defer DHCP discovery (and reset timeout) */ - if ( netdev_link_blocked ( dhcp->netdev ) ) { - DBGC ( dhcp, "DHCP %p deferring discovery\n", dhcp ); - start_timer_fixed ( &dhcp->timer, - ( DHCP_DISC_START_TIMEOUT_SEC * - TICKS_PER_SEC ) ); - return; - } - - /* Give up waiting for ProxyDHCP before we reach the failure point */ - if ( dhcp->offer.s_addr && - ( elapsed > DHCP_DISC_PROXY_TIMEOUT_SEC * TICKS_PER_SEC ) ) { - dhcp_set_state ( dhcp, &dhcp_state_request ); - return; - } - - /* Otherwise, retransmit current packet */ - dhcp_tx ( dhcp ); -} - -/** DHCP discovery state operations */ -static struct dhcp_session_state dhcp_state_discover = { - .name = "discovery", - .tx = dhcp_discovery_tx, - .rx = dhcp_discovery_rx, - .expired = dhcp_discovery_expired, - .tx_msgtype = DHCPDISCOVER, - .min_timeout_sec = DHCP_DISC_START_TIMEOUT_SEC, - .max_timeout_sec = DHCP_DISC_END_TIMEOUT_SEC, -}; - -/** - * Construct transmitted packet for DHCP request - * - * @v dhcp DHCP session - * @v dhcppkt DHCP packet - * @v peer Destination address - */ -static int dhcp_request_tx ( struct dhcp_session *dhcp, - struct dhcp_packet *dhcppkt, - struct sockaddr_in *peer ) { - int rc; - - DBGC ( dhcp, "DHCP %p DHCPREQUEST to %s:%d", - dhcp, inet_ntoa ( dhcp->server ), BOOTPS_PORT ); - DBGC ( dhcp, " for %s\n", inet_ntoa ( dhcp->offer ) ); - - /* Set server ID */ - if ( ( rc = dhcppkt_store ( dhcppkt, DHCP_SERVER_IDENTIFIER, - &dhcp->server, - sizeof ( dhcp->server ) ) ) != 0 ) - return rc; - - /* Set requested IP address */ - if ( ( rc = dhcppkt_store ( dhcppkt, DHCP_REQUESTED_ADDRESS, - &dhcp->offer, - sizeof ( dhcp->offer ) ) ) != 0 ) - return rc; - - /* Set server address */ - peer->sin_addr.s_addr = INADDR_BROADCAST; - peer->sin_port = htons ( BOOTPS_PORT ); - - return 0; -} - -/** - * Handle received packet during DHCP request - * - * @v dhcp DHCP session - * @v dhcppkt DHCP packet - * @v peer DHCP server address - * @v msgtype DHCP message type - * @v server_id DHCP server ID - * @v pseudo_id DHCP server pseudo-ID - */ -static void dhcp_request_rx ( struct dhcp_session *dhcp, - struct dhcp_packet *dhcppkt, - struct sockaddr_in *peer, uint8_t msgtype, - struct in_addr server_id, - struct in_addr pseudo_id ) { - struct in_addr ip; - struct settings *parent; - struct settings *settings; - int rc; - - DBGC ( dhcp, "DHCP %p %s from %s:%d", dhcp, - dhcp_msgtype_name ( msgtype ), inet_ntoa ( peer->sin_addr ), - ntohs ( peer->sin_port ) ); - if ( ( server_id.s_addr != peer->sin_addr.s_addr ) || - ( pseudo_id.s_addr != peer->sin_addr.s_addr ) ) { - DBGC ( dhcp, " (%s/", inet_ntoa ( server_id ) ); - DBGC ( dhcp, "%s)", inet_ntoa ( pseudo_id ) ); - } - - /* Identify leased IP address */ - ip = dhcppkt->dhcphdr->yiaddr; - if ( ip.s_addr ) - DBGC ( dhcp, " for %s", inet_ntoa ( ip ) ); - DBGC ( dhcp, "\n" ); - - /* Filter out unacceptable responses */ - if ( peer->sin_port != htons ( BOOTPS_PORT ) ) - return; - if ( msgtype /* BOOTP */ && ( msgtype != DHCPACK ) ) - return; - if ( server_id.s_addr != dhcp->server.s_addr ) - return; - if ( ip.s_addr != dhcp->offer.s_addr ) - return; - - /* Record assigned address */ - dhcp->local.sin_addr = ip; - - /* Register settings */ - parent = netdev_settings ( dhcp->netdev ); - settings = &dhcppkt->settings; - if ( ( rc = register_settings ( settings, parent, - DHCP_SETTINGS_NAME ) ) != 0 ) { - DBGC ( dhcp, "DHCP %p could not register settings: %s\n", - dhcp, strerror ( rc ) ); - dhcp_finished ( dhcp, rc ); - return; - } - - /* Perform ProxyDHCP if applicable */ - if ( dhcp->proxy_offer /* Have ProxyDHCP offer */ && - ( ! dhcp->no_pxedhcp ) /* ProxyDHCP not disabled */ ) { - if ( dhcp_has_pxeopts ( dhcp->proxy_offer ) ) { - /* PXE options already present; register settings - * without performing a ProxyDHCPREQUEST - */ - settings = &dhcp->proxy_offer->settings; - if ( ( rc = register_settings ( settings, NULL, - PROXYDHCP_SETTINGS_NAME ) ) != 0 ) { - DBGC ( dhcp, "DHCP %p could not register " - "proxy settings: %s\n", - dhcp, strerror ( rc ) ); - dhcp_finished ( dhcp, rc ); - return; - } - } else { - /* PXE options not present; use a ProxyDHCPREQUEST */ - dhcp_set_state ( dhcp, &dhcp_state_proxy ); - return; - } - } - - /* Terminate DHCP */ - dhcp_finished ( dhcp, 0 ); -} - -/** - * Handle timer expiry during DHCP discovery - * - * @v dhcp DHCP session - */ -static void dhcp_request_expired ( struct dhcp_session *dhcp ) { - - /* Retransmit current packet */ - dhcp_tx ( dhcp ); -} - -/** DHCP request state operations */ -static struct dhcp_session_state dhcp_state_request = { - .name = "request", - .tx = dhcp_request_tx, - .rx = dhcp_request_rx, - .expired = dhcp_request_expired, - .tx_msgtype = DHCPREQUEST, - .min_timeout_sec = DHCP_REQ_START_TIMEOUT_SEC, - .max_timeout_sec = DHCP_REQ_END_TIMEOUT_SEC, -}; - -/** - * Construct transmitted packet for ProxyDHCP request - * - * @v dhcp DHCP session - * @v dhcppkt DHCP packet - * @v peer Destination address - */ -static int dhcp_proxy_tx ( struct dhcp_session *dhcp, - struct dhcp_packet *dhcppkt, - struct sockaddr_in *peer ) { - int rc; - - DBGC ( dhcp, "DHCP %p ProxyDHCP REQUEST to %s\n", dhcp, - inet_ntoa ( dhcp->proxy_server ) ); - - /* Set server ID */ - if ( ( rc = dhcppkt_store ( dhcppkt, DHCP_SERVER_IDENTIFIER, - &dhcp->proxy_server, - sizeof ( dhcp->proxy_server ) ) ) != 0 ) - return rc; - - /* Set server address */ - peer->sin_addr = dhcp->proxy_server; - peer->sin_port = htons ( PXE_PORT ); - - return 0; -} - -/** - * Handle received packet during ProxyDHCP request - * - * @v dhcp DHCP session - * @v dhcppkt DHCP packet - * @v peer DHCP server address - * @v msgtype DHCP message type - * @v server_id DHCP server ID - * @v pseudo_id DHCP server pseudo-ID - */ -static void dhcp_proxy_rx ( struct dhcp_session *dhcp, - struct dhcp_packet *dhcppkt, - struct sockaddr_in *peer, uint8_t msgtype, - struct in_addr server_id, - struct in_addr pseudo_id ) { - struct settings *settings = &dhcppkt->settings; - int rc; - - DBGC ( dhcp, "DHCP %p %s from %s:%d", dhcp, - dhcp_msgtype_name ( msgtype ), inet_ntoa ( peer->sin_addr ), - ntohs ( peer->sin_port ) ); - if ( ( server_id.s_addr != peer->sin_addr.s_addr ) || - ( pseudo_id.s_addr != peer->sin_addr.s_addr ) ) { - DBGC ( dhcp, " (%s/", inet_ntoa ( server_id ) ); - DBGC ( dhcp, "%s)", inet_ntoa ( pseudo_id ) ); - } - if ( dhcp_has_pxeopts ( dhcppkt ) ) - DBGC ( dhcp, " pxe" ); - DBGC ( dhcp, "\n" ); - - /* Filter out unacceptable responses */ - if ( peer->sin_port != ntohs ( PXE_PORT ) ) - return; - if ( ( msgtype != DHCPOFFER ) && ( msgtype != DHCPACK ) ) - return; - if ( ( pseudo_id.s_addr != dhcp->proxy_server.s_addr ) ) - return; - if ( ! dhcp_has_pxeopts ( dhcppkt ) ) - return; - - /* Register settings */ - if ( ( rc = register_settings ( settings, NULL, - PROXYDHCP_SETTINGS_NAME ) ) != 0 ) { - DBGC ( dhcp, "DHCP %p could not register proxy settings: %s\n", - dhcp, strerror ( rc ) ); - dhcp_finished ( dhcp, rc ); - return; - } - - /* Terminate DHCP */ - dhcp_finished ( dhcp, 0 ); -} - -/** - * Handle timer expiry during ProxyDHCP request - * - * @v dhcp DHCP session - */ -static void dhcp_proxy_expired ( struct dhcp_session *dhcp ) { - unsigned long elapsed = ( currticks() - dhcp->start ); - - /* Give up waiting for ProxyDHCP before we reach the failure point */ - if ( elapsed > DHCP_REQ_PROXY_TIMEOUT_SEC * TICKS_PER_SEC ) { - dhcp_finished ( dhcp, 0 ); - return; - } - - /* Retransmit current packet */ - dhcp_tx ( dhcp ); -} - -/** ProxyDHCP request state operations */ -static struct dhcp_session_state dhcp_state_proxy = { - .name = "ProxyDHCP", - .tx = dhcp_proxy_tx, - .rx = dhcp_proxy_rx, - .expired = dhcp_proxy_expired, - .tx_msgtype = DHCPREQUEST, - .min_timeout_sec = DHCP_PROXY_START_TIMEOUT_SEC, - .max_timeout_sec = DHCP_PROXY_END_TIMEOUT_SEC, -}; - -/** - * Construct transmitted packet for PXE Boot Server Discovery - * - * @v dhcp DHCP session - * @v dhcppkt DHCP packet - * @v peer Destination address - */ -static int dhcp_pxebs_tx ( struct dhcp_session *dhcp, - struct dhcp_packet *dhcppkt, - struct sockaddr_in *peer ) { - struct dhcp_pxe_boot_menu_item menu_item = { 0, 0 }; - int rc; - - /* Set server address */ - peer->sin_addr = *(dhcp->pxe_attempt); - peer->sin_port = ( ( peer->sin_addr.s_addr == INADDR_BROADCAST ) ? - htons ( BOOTPS_PORT ) : htons ( PXE_PORT ) ); - - DBGC ( dhcp, "DHCP %p PXEBS REQUEST to %s:%d for type %d\n", - dhcp, inet_ntoa ( peer->sin_addr ), ntohs ( peer->sin_port ), - le16_to_cpu ( dhcp->pxe_type ) ); - - /* Set boot menu item */ - menu_item.type = dhcp->pxe_type; - if ( ( rc = dhcppkt_store ( dhcppkt, DHCP_PXE_BOOT_MENU_ITEM, - &menu_item, sizeof ( menu_item ) ) ) != 0 ) - return rc; - - return 0; -} - -/** - * Check to see if PXE Boot Server address is acceptable - * - * @v dhcp DHCP session - * @v bs Boot Server address - * @ret accept Boot Server is acceptable - */ -static int dhcp_pxebs_accept ( struct dhcp_session *dhcp, - struct in_addr bs ) { - struct in_addr *accept; - - /* Accept if we have no acceptance filter */ - if ( ! dhcp->pxe_accept ) - return 1; - - /* Scan through acceptance list */ - for ( accept = dhcp->pxe_accept ; accept->s_addr ; accept++ ) { - if ( accept->s_addr == bs.s_addr ) - return 1; - } - - DBGC ( dhcp, "DHCP %p rejecting server %s\n", - dhcp, inet_ntoa ( bs ) ); - return 0; -} - -/** - * Handle received packet during PXE Boot Server Discovery - * - * @v dhcp DHCP session - * @v dhcppkt DHCP packet - * @v peer DHCP server address - * @v msgtype DHCP message type - * @v server_id DHCP server ID - * @v pseudo_id DHCP server pseudo-ID - */ -static void dhcp_pxebs_rx ( struct dhcp_session *dhcp, - struct dhcp_packet *dhcppkt, - struct sockaddr_in *peer, uint8_t msgtype, - struct in_addr server_id, - struct in_addr pseudo_id ) { - struct dhcp_pxe_boot_menu_item menu_item = { 0, 0 }; - int rc; - - DBGC ( dhcp, "DHCP %p %s from %s:%d", dhcp, - dhcp_msgtype_name ( msgtype ), inet_ntoa ( peer->sin_addr ), - ntohs ( peer->sin_port ) ); - if ( ( server_id.s_addr != peer->sin_addr.s_addr ) || - ( pseudo_id.s_addr != peer->sin_addr.s_addr ) ) { - DBGC ( dhcp, " (%s/", inet_ntoa ( server_id ) ); - DBGC ( dhcp, "%s)", inet_ntoa ( pseudo_id ) ); - } - - /* Identify boot menu item */ - dhcppkt_fetch ( dhcppkt, DHCP_PXE_BOOT_MENU_ITEM, - &menu_item, sizeof ( menu_item ) ); - if ( menu_item.type ) - DBGC ( dhcp, " for type %d", ntohs ( menu_item.type ) ); - DBGC ( dhcp, "\n" ); - - /* Filter out unacceptable responses */ - if ( ( peer->sin_port != htons ( BOOTPS_PORT ) ) && - ( peer->sin_port != htons ( PXE_PORT ) ) ) - return; - if ( msgtype != DHCPACK ) - return; - if ( menu_item.type != dhcp->pxe_type ) - return; - if ( ! dhcp_pxebs_accept ( dhcp, pseudo_id ) ) - return; - - /* Register settings */ - if ( ( rc = register_settings ( &dhcppkt->settings, NULL, - PXEBS_SETTINGS_NAME ) ) != 0 ) { - DBGC ( dhcp, "DHCP %p could not register settings: %s\n", - dhcp, strerror ( rc ) ); - dhcp_finished ( dhcp, rc ); - return; - } - - /* Terminate DHCP */ - dhcp_finished ( dhcp, 0 ); -} - -/** - * Handle timer expiry during PXE Boot Server Discovery - * - * @v dhcp DHCP session - */ -static void dhcp_pxebs_expired ( struct dhcp_session *dhcp ) { - unsigned long elapsed = ( currticks() - dhcp->start ); - - /* Give up waiting before we reach the failure point, and fail - * over to the next server in the attempt list - */ - if ( elapsed > PXEBS_MAX_TIMEOUT_SEC * TICKS_PER_SEC ) { - dhcp->pxe_attempt++; - if ( dhcp->pxe_attempt->s_addr ) { - dhcp_set_state ( dhcp, &dhcp_state_pxebs ); - return; - } else { - dhcp_finished ( dhcp, -ETIMEDOUT ); - return; - } - } - - /* Retransmit current packet */ - dhcp_tx ( dhcp ); -} - -/** PXE Boot Server Discovery state operations */ -static struct dhcp_session_state dhcp_state_pxebs = { - .name = "PXEBS", - .tx = dhcp_pxebs_tx, - .rx = dhcp_pxebs_rx, - .expired = dhcp_pxebs_expired, - .tx_msgtype = DHCPREQUEST, - .min_timeout_sec = PXEBS_START_TIMEOUT_SEC, - .max_timeout_sec = PXEBS_END_TIMEOUT_SEC, -}; - -/**************************************************************************** - * - * Packet construction - * - */ - -/** - * Create a DHCP packet - * - * @v dhcppkt DHCP packet structure to fill in - * @v netdev Network device - * @v msgtype DHCP message type - * @v xid Transaction ID (in network-endian order) - * @v options Initial options to include (or NULL) - * @v options_len Length of initial options - * @v data Buffer for DHCP packet - * @v max_len Size of DHCP packet buffer - * @ret rc Return status code - * - * Creates a DHCP packet in the specified buffer, and initialise a - * DHCP packet structure. - */ -int dhcp_create_packet ( struct dhcp_packet *dhcppkt, - struct net_device *netdev, uint8_t msgtype, - uint32_t xid, const void *options, size_t options_len, - void *data, size_t max_len ) { - struct dhcphdr *dhcphdr = data; - int rc; - - /* Sanity check */ - if ( max_len < ( sizeof ( *dhcphdr ) + options_len ) ) - return -ENOSPC; - - /* Initialise DHCP packet content */ - memset ( dhcphdr, 0, max_len ); - dhcphdr->xid = xid; - dhcphdr->magic = htonl ( DHCP_MAGIC_COOKIE ); - dhcphdr->htype = ntohs ( netdev->ll_protocol->ll_proto ); - dhcphdr->op = dhcp_op[msgtype]; - dhcphdr->hlen = netdev->ll_protocol->ll_addr_len; - memcpy ( dhcphdr->chaddr, netdev->ll_addr, - netdev->ll_protocol->ll_addr_len ); - memcpy ( dhcphdr->options, options, options_len ); - - /* If the local link-layer address functions only as a name - * (i.e. cannot be used as a destination address), then - * request broadcast responses. - */ - if ( netdev->ll_protocol->flags & LL_NAME_ONLY ) - dhcphdr->flags |= htons ( BOOTP_FL_BROADCAST ); - - /* If the network device already has an IPv4 address then - * unicast responses from the DHCP server may be rejected, so - * request broadcast responses. - */ - if ( ipv4_has_any_addr ( netdev ) ) - dhcphdr->flags |= htons ( BOOTP_FL_BROADCAST ); - - /* Initialise DHCP packet structure */ - memset ( dhcppkt, 0, sizeof ( *dhcppkt ) ); - dhcppkt_init ( dhcppkt, data, max_len ); - - /* Set DHCP_MESSAGE_TYPE option */ - if ( ( rc = dhcppkt_store ( dhcppkt, DHCP_MESSAGE_TYPE, - &msgtype, sizeof ( msgtype ) ) ) != 0 ) - return rc; - - return 0; -} - -/** - * Create DHCP request packet - * - * @v dhcppkt DHCP packet structure to fill in - * @v netdev Network device - * @v msgtype DHCP message type - * @v xid Transaction ID (in network-endian order) - * @v ciaddr Client IP address - * @v data Buffer for DHCP packet - * @v max_len Size of DHCP packet buffer - * @ret rc Return status code - * - * Creates a DHCP request packet in the specified buffer, and - * initialise a DHCP packet structure. - */ -int dhcp_create_request ( struct dhcp_packet *dhcppkt, - struct net_device *netdev, unsigned int msgtype, - uint32_t xid, struct in_addr ciaddr, - void *data, size_t max_len ) { - struct dhcp_netdev_desc dhcp_desc; - struct dhcp_client_id client_id; - struct dhcp_client_uuid client_uuid; - uint8_t *dhcp_features; - size_t dhcp_features_len; - size_t ll_addr_len; - void *user_class; - ssize_t len; - int rc; - - /* Create DHCP packet */ - if ( ( rc = dhcp_create_packet ( dhcppkt, netdev, msgtype, xid, - dhcp_request_options_data, - sizeof ( dhcp_request_options_data ), - data, max_len ) ) != 0 ) { - DBG ( "DHCP could not create DHCP packet: %s\n", - strerror ( rc ) ); - goto err_create_packet; - } - - /* Set client IP address */ - dhcppkt->dhcphdr->ciaddr = ciaddr; - - /* Add options to identify the feature list */ - dhcp_features = table_start ( DHCP_FEATURES ); - dhcp_features_len = table_num_entries ( DHCP_FEATURES ); - if ( ( rc = dhcppkt_store ( dhcppkt, DHCP_EB_ENCAP, dhcp_features, - dhcp_features_len ) ) != 0 ) { - DBG ( "DHCP could not set features list option: %s\n", - strerror ( rc ) ); - goto err_store_features; - } - - /* Add options to identify the network device */ - fetch_raw_setting ( netdev_settings ( netdev ), &busid_setting, - &dhcp_desc, sizeof ( dhcp_desc ) ); - if ( ( rc = dhcppkt_store ( dhcppkt, DHCP_EB_BUS_ID, &dhcp_desc, - sizeof ( dhcp_desc ) ) ) != 0 ) { - DBG ( "DHCP could not set bus ID option: %s\n", - strerror ( rc ) ); - goto err_store_busid; - } - - /* Add DHCP client identifier. Required for Infiniband, and - * doesn't hurt other link layers. - */ - client_id.ll_proto = ntohs ( netdev->ll_protocol->ll_proto ); - ll_addr_len = netdev->ll_protocol->ll_addr_len; - assert ( ll_addr_len <= sizeof ( client_id.ll_addr ) ); - memcpy ( client_id.ll_addr, netdev->ll_addr, ll_addr_len ); - if ( ( rc = dhcppkt_store ( dhcppkt, DHCP_CLIENT_ID, &client_id, - ( ll_addr_len + 1 ) ) ) != 0 ) { - DBG ( "DHCP could not set client ID: %s\n", - strerror ( rc ) ); - goto err_store_client_id; - } - - /* Add client UUID, if we have one. Required for PXE. The - * PXE spec does not specify a byte ordering for UUIDs, but - * RFC4578 suggests that it follows the EFI spec, in which the - * first three fields are little-endian. - */ - client_uuid.type = DHCP_CLIENT_UUID_TYPE; - if ( ( len = fetch_uuid_setting ( NULL, &uuid_setting, - &client_uuid.uuid ) ) >= 0 ) { - uuid_mangle ( &client_uuid.uuid ); - if ( ( rc = dhcppkt_store ( dhcppkt, DHCP_CLIENT_UUID, - &client_uuid, - sizeof ( client_uuid ) ) ) != 0 ) { - DBG ( "DHCP could not set client UUID: %s\n", - strerror ( rc ) ); - goto err_store_client_uuid; - } - } - - /* Add user class, if we have one. */ - if ( ( len = fetch_raw_setting_copy ( NULL, &user_class_setting, - &user_class ) ) >= 0 ) { - if ( ( rc = dhcppkt_store ( dhcppkt, DHCP_USER_CLASS_ID, - user_class, len ) ) != 0 ) { - DBG ( "DHCP could not set user class: %s\n", - strerror ( rc ) ); - goto err_store_user_class; - } - } - - err_store_user_class: - free ( user_class ); - err_store_client_uuid: - err_store_client_id: - err_store_busid: - err_store_features: - err_create_packet: - return rc; -} - -/**************************************************************************** - * - * Data transfer interface - * - */ - -/** - * Transmit DHCP request - * - * @v dhcp DHCP session - * @ret rc Return status code - */ -static int dhcp_tx ( struct dhcp_session *dhcp ) { - static struct sockaddr_in peer = { - .sin_family = AF_INET, - }; - struct xfer_metadata meta = { - .netdev = dhcp->netdev, - .src = ( struct sockaddr * ) &dhcp->local, - .dest = ( struct sockaddr * ) &peer, - }; - struct io_buffer *iobuf; - uint8_t msgtype = dhcp->state->tx_msgtype; - struct dhcp_packet dhcppkt; - int rc; - - /* Start retry timer. Do this first so that failures to - * transmit will be retried. - */ - start_timer ( &dhcp->timer ); - - /* Allocate buffer for packet */ - iobuf = xfer_alloc_iob ( &dhcp->xfer, DHCP_MIN_LEN ); - if ( ! iobuf ) - return -ENOMEM; - - /* Create basic DHCP packet in temporary buffer */ - if ( ( rc = dhcp_create_request ( &dhcppkt, dhcp->netdev, msgtype, - dhcp->xid, dhcp->local.sin_addr, - iobuf->data, - iob_tailroom ( iobuf ) ) ) != 0 ) { - DBGC ( dhcp, "DHCP %p could not construct DHCP request: %s\n", - dhcp, strerror ( rc ) ); - goto done; - } - - /* (Ab)use the "secs" field to convey metadata about the DHCP - * session state into packet traces. Useful for extracting - * debug information from non-debug builds. - */ - dhcppkt.dhcphdr->secs = htons ( ( ++(dhcp->count) << 2 ) | - ( dhcp->offer.s_addr ? 0x02 : 0 ) | - ( dhcp->proxy_offer ? 0x01 : 0 ) ); - - /* Fill in packet based on current state */ - if ( ( rc = dhcp->state->tx ( dhcp, &dhcppkt, &peer ) ) != 0 ) { - DBGC ( dhcp, "DHCP %p could not fill DHCP request: %s\n", - dhcp, strerror ( rc ) ); - goto done; - } - - /* Transmit the packet */ - iob_put ( iobuf, dhcppkt_len ( &dhcppkt ) ); - if ( ( rc = xfer_deliver ( &dhcp->xfer, iob_disown ( iobuf ), - &meta ) ) != 0 ) { - DBGC ( dhcp, "DHCP %p could not transmit UDP packet: %s\n", - dhcp, strerror ( rc ) ); - goto done; - } - - done: - free_iob ( iobuf ); - return rc; -} - -/** - * Receive new data - * - * @v dhcp DHCP session - * @v iobuf I/O buffer - * @v meta Transfer metadata - * @ret rc Return status code - */ -static int dhcp_deliver ( struct dhcp_session *dhcp, - struct io_buffer *iobuf, - struct xfer_metadata *meta ) { - struct net_device *netdev = dhcp->netdev; - struct ll_protocol *ll_protocol = netdev->ll_protocol; - struct sockaddr_in *peer; - size_t data_len; - struct dhcp_packet *dhcppkt; - struct dhcphdr *dhcphdr; - uint8_t msgtype = 0; - struct in_addr server_id = { 0 }; - struct in_addr pseudo_id; - int rc = 0; - - /* Sanity checks */ - if ( ! meta->src ) { - DBGC ( dhcp, "DHCP %p received packet without source port\n", - dhcp ); - rc = -EINVAL; - goto err_no_src; - } - peer = ( struct sockaddr_in * ) meta->src; - - /* Create a DHCP packet containing the I/O buffer contents. - * Whilst we could just use the original buffer in situ, that - * would waste the unused space in the packet buffer, and also - * waste a relatively scarce fully-aligned I/O buffer. - */ - data_len = iob_len ( iobuf ); - dhcppkt = zalloc ( sizeof ( *dhcppkt ) + data_len ); - if ( ! dhcppkt ) { - rc = -ENOMEM; - goto err_alloc_dhcppkt; - } - dhcphdr = ( ( ( void * ) dhcppkt ) + sizeof ( *dhcppkt ) ); - memcpy ( dhcphdr, iobuf->data, data_len ); - dhcppkt_init ( dhcppkt, dhcphdr, data_len ); - - /* Identify message type */ - dhcppkt_fetch ( dhcppkt, DHCP_MESSAGE_TYPE, &msgtype, - sizeof ( msgtype ) ); - - /* Identify server ID */ - dhcppkt_fetch ( dhcppkt, DHCP_SERVER_IDENTIFIER, - &server_id, sizeof ( server_id ) ); - - /* Identify server pseudo-ID */ - pseudo_id = server_id; - if ( ! pseudo_id.s_addr ) - pseudo_id = dhcppkt->dhcphdr->siaddr; - if ( ! pseudo_id.s_addr ) - pseudo_id = peer->sin_addr; - - /* Check for matching transaction ID */ - if ( dhcphdr->xid != dhcp->xid ) { - DBGC ( dhcp, "DHCP %p %s from %s:%d has bad transaction " - "ID\n", dhcp, dhcp_msgtype_name ( msgtype ), - inet_ntoa ( peer->sin_addr ), - ntohs ( peer->sin_port ) ); - rc = -EINVAL; - goto err_xid; - }; - - /* Check for matching client hardware address */ - if ( memcmp ( dhcphdr->chaddr, netdev->ll_addr, - ll_protocol->ll_addr_len ) != 0 ) { - DBGC ( dhcp, "DHCP %p %s from %s:%d has bad chaddr %s\n", - dhcp, dhcp_msgtype_name ( msgtype ), - inet_ntoa ( peer->sin_addr ), ntohs ( peer->sin_port ), - ll_protocol->ntoa ( dhcphdr->chaddr ) ); - rc = -EINVAL; - goto err_chaddr; - } - - /* Handle packet based on current state */ - dhcp->state->rx ( dhcp, dhcppkt, peer, msgtype, server_id, pseudo_id ); - - err_chaddr: - err_xid: - dhcppkt_put ( dhcppkt ); - err_alloc_dhcppkt: - err_no_src: - free_iob ( iobuf ); - return rc; -} - -/** DHCP data transfer interface operations */ -static struct interface_operation dhcp_xfer_operations[] = { - INTF_OP ( xfer_deliver, struct dhcp_session *, dhcp_deliver ), -}; - -/** DHCP data transfer interface descriptor */ -static struct interface_descriptor dhcp_xfer_desc = - INTF_DESC ( struct dhcp_session, xfer, dhcp_xfer_operations ); - -/** - * Handle DHCP retry timer expiry - * - * @v timer DHCP retry timer - * @v fail Failure indicator - */ -static void dhcp_timer_expired ( struct retry_timer *timer, int fail ) { - struct dhcp_session *dhcp = - container_of ( timer, struct dhcp_session, timer ); - - /* If we have failed, terminate DHCP */ - if ( fail ) { - dhcp_finished ( dhcp, -ETIMEDOUT ); - return; - } - - /* Handle timer expiry based on current state */ - dhcp->state->expired ( dhcp ); -} - -/**************************************************************************** - * - * Job control interface - * - */ - -/** DHCP job control interface operations */ -static struct interface_operation dhcp_job_op[] = { - INTF_OP ( intf_close, struct dhcp_session *, dhcp_finished ), -}; - -/** DHCP job control interface descriptor */ -static struct interface_descriptor dhcp_job_desc = - INTF_DESC ( struct dhcp_session, job, dhcp_job_op ); - -/**************************************************************************** - * - * Instantiators - * - */ - -/** - * DHCP peer address for socket opening - * - * This is a dummy address; the only useful portion is the socket - * family (so that we get a UDP connection). The DHCP client will set - * the IP address and source port explicitly on each transmission. - */ -static struct sockaddr dhcp_peer = { - .sa_family = AF_INET, -}; - -/** - * Start DHCP state machine on a network device - * - * @v job Job control interface - * @v netdev Network device - * @ret rc Return status code - * - * Starts DHCP on the specified network device. If successful, the - * DHCPACK (and ProxyDHCPACK, if applicable) will be registered as - * option sources. - */ -int start_dhcp ( struct interface *job, struct net_device *netdev ) { - struct dhcp_session *dhcp; - int rc; - - /* Allocate and initialise structure */ - dhcp = zalloc ( sizeof ( *dhcp ) ); - if ( ! dhcp ) - return -ENOMEM; - ref_init ( &dhcp->refcnt, dhcp_free ); - intf_init ( &dhcp->job, &dhcp_job_desc, &dhcp->refcnt ); - intf_init ( &dhcp->xfer, &dhcp_xfer_desc, &dhcp->refcnt ); - timer_init ( &dhcp->timer, dhcp_timer_expired, &dhcp->refcnt ); - dhcp->netdev = netdev_get ( netdev ); - dhcp->local.sin_family = AF_INET; - dhcp->local.sin_port = htons ( BOOTPC_PORT ); - dhcp->xid = random(); - - /* Store DHCP transaction ID for fakedhcp code */ - dhcp_last_xid = dhcp->xid; - - /* Instantiate child objects and attach to our interfaces */ - if ( ( rc = xfer_open_socket ( &dhcp->xfer, SOCK_DGRAM, &dhcp_peer, - ( struct sockaddr * ) &dhcp->local ) ) != 0 ) - goto err; - - /* Enter DHCPDISCOVER state */ - dhcp_set_state ( dhcp, &dhcp_state_discover ); - - /* Attach parent interface, mortalise self, and return */ - intf_plug_plug ( &dhcp->job, job ); - ref_put ( &dhcp->refcnt ); - return 0; - - err: - dhcp_finished ( dhcp, rc ); - ref_put ( &dhcp->refcnt ); - return rc; -} - -/** - * Retrieve list of PXE boot servers for a given server type - * - * @v dhcp DHCP session - * @v raw DHCP PXE boot server list - * @v raw_len Length of DHCP PXE boot server list - * @v ip IP address list to fill in - * - * The caller must ensure that the IP address list has sufficient - * space. - */ -static void pxebs_list ( struct dhcp_session *dhcp, void *raw, - size_t raw_len, struct in_addr *ip ) { - struct dhcp_pxe_boot_server *server = raw; - size_t server_len; - unsigned int i; - - while ( raw_len ) { - if ( raw_len < sizeof ( *server ) ) { - DBGC ( dhcp, "DHCP %p malformed PXE server list\n", - dhcp ); - break; - } - server_len = offsetof ( typeof ( *server ), - ip[ server->num_ip ] ); - if ( raw_len < server_len ) { - DBGC ( dhcp, "DHCP %p malformed PXE server list\n", - dhcp ); - break; - } - if ( server->type == dhcp->pxe_type ) { - for ( i = 0 ; i < server->num_ip ; i++ ) - *(ip++) = server->ip[i]; - } - server = ( ( ( void * ) server ) + server_len ); - raw_len -= server_len; - } -} - -/** - * Start PXE Boot Server Discovery on a network device - * - * @v job Job control interface - * @v netdev Network device - * @v pxe_type PXE server type - * @ret rc Return status code - * - * Starts PXE Boot Server Discovery on the specified network device. - * If successful, the Boot Server ACK will be registered as an option - * source. - */ -int start_pxebs ( struct interface *job, struct net_device *netdev, - unsigned int pxe_type ) { - struct setting pxe_discovery_control_setting = - { .tag = DHCP_PXE_DISCOVERY_CONTROL }; - struct setting pxe_boot_servers_setting = - { .tag = DHCP_PXE_BOOT_SERVERS }; - struct setting pxe_boot_server_mcast_setting = - { .tag = DHCP_PXE_BOOT_SERVER_MCAST }; - ssize_t pxebs_list_len; - struct dhcp_session *dhcp; - struct in_addr *ip; - unsigned int pxe_discovery_control; - int rc; - - /* Get upper bound for PXE boot server IP address list */ - pxebs_list_len = fetch_raw_setting ( NULL, &pxe_boot_servers_setting, - NULL, 0 ); - if ( pxebs_list_len < 0 ) - pxebs_list_len = 0; - - /* Allocate and initialise structure */ - dhcp = zalloc ( sizeof ( *dhcp ) + sizeof ( *ip ) /* mcast */ + - sizeof ( *ip ) /* bcast */ + pxebs_list_len + - sizeof ( *ip ) /* terminator */ ); - if ( ! dhcp ) - return -ENOMEM; - ref_init ( &dhcp->refcnt, dhcp_free ); - intf_init ( &dhcp->job, &dhcp_job_desc, &dhcp->refcnt ); - intf_init ( &dhcp->xfer, &dhcp_xfer_desc, &dhcp->refcnt ); - timer_init ( &dhcp->timer, dhcp_timer_expired, &dhcp->refcnt ); - dhcp->netdev = netdev_get ( netdev ); - dhcp->local.sin_family = AF_INET; - fetch_ipv4_setting ( netdev_settings ( netdev ), &ip_setting, - &dhcp->local.sin_addr ); - dhcp->local.sin_port = htons ( BOOTPC_PORT ); - dhcp->pxe_type = cpu_to_le16 ( pxe_type ); - - /* Construct PXE boot server IP address lists */ - pxe_discovery_control = - fetch_uintz_setting ( NULL, &pxe_discovery_control_setting ); - ip = ( ( ( void * ) dhcp ) + sizeof ( *dhcp ) ); - dhcp->pxe_attempt = ip; - if ( ! ( pxe_discovery_control & PXEBS_NO_MULTICAST ) ) { - fetch_ipv4_setting ( NULL, &pxe_boot_server_mcast_setting, ip); - if ( ip->s_addr ) - ip++; - } - if ( ! ( pxe_discovery_control & PXEBS_NO_BROADCAST ) ) - (ip++)->s_addr = INADDR_BROADCAST; - if ( pxe_discovery_control & PXEBS_NO_UNKNOWN_SERVERS ) - dhcp->pxe_accept = ip; - if ( pxebs_list_len ) { - uint8_t buf[pxebs_list_len]; - - fetch_raw_setting ( NULL, &pxe_boot_servers_setting, - buf, sizeof ( buf ) ); - pxebs_list ( dhcp, buf, sizeof ( buf ), ip ); - } - if ( ! dhcp->pxe_attempt->s_addr ) { - DBGC ( dhcp, "DHCP %p has no PXE boot servers for type %04x\n", - dhcp, pxe_type ); - rc = -EINVAL; - goto err; - } - - /* Dump out PXE server lists */ - DBGC ( dhcp, "DHCP %p attempting", dhcp ); - for ( ip = dhcp->pxe_attempt ; ip->s_addr ; ip++ ) - DBGC ( dhcp, " %s", inet_ntoa ( *ip ) ); - DBGC ( dhcp, "\n" ); - if ( dhcp->pxe_accept ) { - DBGC ( dhcp, "DHCP %p accepting", dhcp ); - for ( ip = dhcp->pxe_accept ; ip->s_addr ; ip++ ) - DBGC ( dhcp, " %s", inet_ntoa ( *ip ) ); - DBGC ( dhcp, "\n" ); - } - - /* Instantiate child objects and attach to our interfaces */ - if ( ( rc = xfer_open_socket ( &dhcp->xfer, SOCK_DGRAM, &dhcp_peer, - ( struct sockaddr * ) &dhcp->local ) ) != 0 ) - goto err; - - /* Enter PXEBS state */ - dhcp_set_state ( dhcp, &dhcp_state_pxebs ); - - /* Attach parent interface, mortalise self, and return */ - intf_plug_plug ( &dhcp->job, job ); - ref_put ( &dhcp->refcnt ); - return 0; - - err: - dhcp_finished ( dhcp, rc ); - ref_put ( &dhcp->refcnt ); - return rc; -} - -/** DHCP network device configurator */ -struct net_device_configurator dhcp_configurator __net_device_configurator = { - .name = "dhcp", - .start = start_dhcp, -}; |