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 "fs/pxe/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 dns_resolv(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 void net_parse_dhcp(void)
  69 {
  70     EFI_PXE_BASE_CODE_MODE *mode;
  71     EFI_PXE_BASE_CODE *bc;
  72     unsigned int pkt_len = sizeof(EFI_PXE_BASE_CODE_PACKET);
  73     EFI_STATUS status;
  74     EFI_HANDLE *handles = NULL;
  75     UINTN nr_handles = 0;
  76     uint8_t hardlen;
  77     uint32_t ip;
  78     char dst[256];
  79
  80     status = LibLocateHandle(ByProtocol, &PxeBaseCodeProtocol,
  81                          NULL, &nr_handles, &handles);
  82     if (status != EFI_SUCCESS)
  83         return;
  84
  85     /* Probably want to use IPv4 protocol to decide which handle to use */
  86     status = uefi_call_wrapper(BS->HandleProtocol, 3, handles[0],
  87                            &PxeBaseCodeProtocol, (void **)&bc);
  88     if (status != EFI_SUCCESS) {
  89         Print(L"Failed to lookup PxeBaseCodeProtocol\n");
  90     }
  91
  92     mode = bc->Mode;
  93
  94     /*
  95      * Get the DHCP client identifiers (query info 1)
  96      */
  97     Print(L"Getting cached packet ");
  98     parse_dhcp(&mode->DhcpDiscover.Dhcpv4, pkt_len);
  99     /*
 100      * We don't use flags from the request packet, so
 101      * this is a good time to initialize DHCPMagic...
 102      * Initialize it to 1 meaning we will accept options found;
 103      * in earlier versions of PXELINUX bit 0 was used to indicate
 104      * we have found option 208 with the appropriate magic number;
 105      * we no longer require that, but MAY want to re-introduce
 106      * it in the future for vendor encapsulated options.
 107      */
 108     *(char *)&DHCPMagic = 1;
 109
 110     /*
 111      * Get the BOOTP/DHCP packet that brought us file (and an IP
 112      * address). This lives in the DHCPACK packet (query info 2)
 113      */
 114     parse_dhcp(&mode->DhcpAck.Dhcpv4, pkt_len);
 115     /*
 116      * Save away MAC address (assume this is in query info 2. If this
 117      * turns out to be problematic it might be better getting it from
 118      * the query info 1 packet
 119      */
 120     hardlen = mode->DhcpAck.Dhcpv4.BootpHwAddrLen;
 121     MAC_len = hardlen > 16 ? 0 : hardlen;
 122     MAC_type = mode->DhcpAck.Dhcpv4.BootpHwType;
 123     memcpy(MAC, mode->DhcpAck.Dhcpv4.BootpHwAddr, MAC_len);
 124
 125     /*
 126      * Get the boot file and other info. This lives in the CACHED_REPLY
 127      * packet (query info 3)
 128      */
 129     parse_dhcp(&mode->PxeReply.Dhcpv4, pkt_len);
 130     Print(L"\n");
 131
 132     ip = IPInfo.myip;
 133     sprintf(dst, "%u.%u.%u.%u",
 134         ((const uint8_t *)&ip)[0],
 135         ((const uint8_t *)&ip)[1],
 136         ((const uint8_t *)&ip)[2],
 137         ((const uint8_t *)&ip)[3]);
 138
 139     Print(L"My IP is %a\n", dst);
 140 }