efi/pxe.c

   1 /*
   2  * Copyright 2013-2014 Intel Corporation - All Rights Reserved
   3  */
   4
   5 #include <syslinux/firmware.h>
   6 #include <syslinux/pxe_api.h>
   7 #include "efi.h"
   8 #include "net.h"
   9 #include "core_pxe.h"
  10
  11 const struct url_scheme url_schemes[] = {
  12     { "tftp", tftp_open, 0 },
  13     { "http", http_open, O_DIRECTORY },
  14     { "ftp",  ftp_open,  O_DIRECTORY },
  15     { NULL, NULL, 0 },
  16 };
  17
  18 /**
  19  * Network stack-specific initialization
  20  */
  21 void net_core_init(void)
  22 {
  23     http_bake_cookies();
  24 }
  25
  26 void pxe_init_isr(void) {}
  27 void gpxe_init(void) {}
  28 void pxe_idle_init(void) {}
  29
  30 int reset_pxe(void)
  31 {
  32     return 0;
  33 }
  34
  35 #define DNS_MAX_SERVERS 4               /* Max no of DNS servers */
  36 uint32_t dns_server[DNS_MAX_SERVERS] = {0, };
  37
  38 __export uint32_t pxe_dns(const char *name)
  39 {
  40     /*
  41      * Return failure on an empty input... this can happen during
  42      * some types of URL parsing, and this is the easiest place to
  43      * check for it.
  44      */
  45     if (!name || !*name)
  46         return 0;
  47
  48     return 0;
  49 }
  50
  51 int pxe_init(bool quiet)
  52 {
  53     EFI_HANDLE *handles;
  54     EFI_STATUS status;
  55     UINTN nr_handles;
  56
  57     status = LibLocateHandle(ByProtocol, &PxeBaseCodeProtocol,
  58                              NULL, &nr_handles, &handles);
  59     if (status != EFI_SUCCESS) {
  60         if (!quiet)
  61             Print(L"No PXE Base Code Protocol\n");
  62         return -1;
  63     }
  64
  65     return 0;
  66 }
  67
  68 #define EDHCP_BUF_LEN 8192
  69
  70 struct embedded_dhcp_options {
  71     uint32_t magic[4];
  72     uint32_t bdhcp_len;
  73     uint32_t adhcp_len;
  74     uint32_t buffer_size;
  75     uint32_t reserved;
  76     uint8_t  dhcp_data[EDHCP_BUF_LEN];
  77 } __attribute__((aligned(16)));
  78
  79 struct embedded_dhcp_options embedded_dhcp_options =
  80 {
  81     .magic[0] = 0x2a171ead,
  82     .magic[1] = 0x0600e65e,
  83     .magic[2] = 0x4025a4e4,
  84     .magic[3] = 0x42388fc8,
  85     .bdhcp_len = 0,
  86     .adhcp_len = 0,
  87     .buffer_size = EDHCP_BUF_LEN,
  88 };
  89
  90 void net_parse_dhcp(void)
  91 {
  92     EFI_PXE_BASE_CODE_MODE *mode;
  93     EFI_PXE_BASE_CODE *bc;
  94     unsigned int pkt_len = sizeof(EFI_PXE_BASE_CODE_PACKET);
  95     EFI_STATUS status;
  96     uint8_t hardlen;
  97     uint32_t ip;
  98     char dst[256];
  99
 100     status = uefi_call_wrapper(BS->HandleProtocol, 3, image_device_handle,
 101                                &PxeBaseCodeProtocol, (void **)&bc);
 102     if (status != EFI_SUCCESS) {
 103         Print(L"Failed to lookup PxeBaseCodeProtocol\n");
 104         return;
 105     }
 106
 107     mode = bc->Mode;
 108
 109     /*
 110      * Parse any "before" hardcoded options
 111      */
 112     parse_dhcp_options(embedded_dhcp_options.dhcp_data,
 113                        embedded_dhcp_options.bdhcp_len, 0);
 114
 115     /*
 116      * Get the DHCP client identifiers (BIOS/PXE query info 1)
 117      */
 118     Print(L"Getting cached packet ");
 119     parse_dhcp(&mode->DhcpDiscover.Dhcpv4, pkt_len, 1);
 120     /*
 121      * We don't use flags from the request packet, so
 122      * this is a good time to initialize DHCPMagic...
 123      * Initialize it to 1 meaning we will accept options found;
 124      * in earlier versions of PXELINUX bit 0 was used to indicate
 125      * we have found option 208 with the appropriate magic number;
 126      * we no longer require that, but MAY want to re-introduce
 127      * it in the future for vendor encapsulated options.
 128      */
 129     *(char *)&DHCPMagic = 1;
 130
 131     /*
 132      * Get the BOOTP/DHCP packet that brought us file (and an IP
 133      * address). This lives in the DHCPACK packet (BIOS/PXE query info 2)
 134      */
 135     parse_dhcp(&mode->DhcpAck.Dhcpv4, pkt_len, 2);
 136
 137     /*
 138      * Get the boot file and other info. This lives in the CACHED_REPLY
 139      * packet (BIOS/PXE query info 3)
 140      */
 141     EFI_PXE_BASE_CODE_DHCPV4_PACKET*     pkt_v4 = NULL;
 142
 143     if (mode->PxeReplyReceived)
 144         pkt_v4 = &mode->PxeReply.Dhcpv4;
 145     else if (mode->ProxyOfferReceived)
 146         pkt_v4 = &mode->ProxyOffer.Dhcpv4;
 147
 148     if (pkt_v4)
 149         parse_dhcp(pkt_v4, pkt_len, 3);
 150
 151     /*
 152      * Save away MAC address (assume this is in query info 2. If this
 153      * turns out to be problematic it might be better getting it from
 154      * the query info 1 packet
 155      */
 156     hardlen = mode->DhcpAck.Dhcpv4.BootpHwAddrLen;
 157     MAC_len = hardlen > 16 ? 0 : hardlen;
 158     MAC_type = mode->DhcpAck.Dhcpv4.BootpHwType;
 159     memcpy(MAC, mode->DhcpAck.Dhcpv4.BootpHwAddr, MAC_len);
 160
 161     Print(L"\n");
 162
 163     /*
 164      * Parse any "after" hardcoded options
 165      */
 166     parse_dhcp_options(embedded_dhcp_options.dhcp_data +
 167                        embedded_dhcp_options.bdhcp_len,
 168                        embedded_dhcp_options.adhcp_len, 0);
 169
 170     ip = IPInfo.myip;
 171     sprintf(dst, "%u.%u.%u.%u",
 172         ((const uint8_t *)&ip)[0],
 173         ((const uint8_t *)&ip)[1],
 174         ((const uint8_t *)&ip)[2],
 175         ((const uint8_t *)&ip)[3]);
 176
 177     Print(L"My IP is %a\n", dst);
 178     if (!(ip_ok(ip))) {
 179         Print(L"  NO valid IP found.\n");
 180     }
 181 }