ref: 63f10d4c945e3e692b589175508b95ce8dd9b50d
dir: /sys/src/boot/efi/pxe.c/
#include <u.h> #include "fns.h" #include "efi.h" typedef UINT16 EFI_PXE_BASE_CODE_UDP_PORT; typedef struct { UINT8 Addr[4]; } EFI_IPv4_ADDRESS; typedef struct { UINT8 Addr[16]; } EFI_IPv6_ADDRESS; typedef union { UINT32 Addr[4]; EFI_IPv4_ADDRESS v4; EFI_IPv6_ADDRESS v6; } EFI_IP_ADDRESS; typedef struct { UINT8 Addr[32]; } EFI_MAC_ADDRESS; typedef struct { UINT8 BootpOpcode; UINT8 BootpHwType; UINT8 BootpHwAddrLen; UINT8 BootpGateHops; UINT32 BootpIdent; UINT16 BootpSeconds; UINT16 BootpFlags; UINT8 BootpCiAddr[4]; UINT8 BootpYiAddr[4]; UINT8 BootpSiAddr[4]; UINT8 BootpGiAddr[4]; UINT8 BootpHwAddr[16]; UINT8 BootpSrvName[64]; UINT8 BootpBootFile[128]; UINT32 DhcpMagik; UINT8 DhcpOptions[56]; } EFI_PXE_BASE_CODE_DHCPV4_PACKET; typedef struct { BOOLEAN Started; BOOLEAN Ipv6Available; BOOLEAN Ipv6Supported; BOOLEAN UsingIpv6; BOOLEAN BisSupported; BOOLEAN BisDetected; BOOLEAN AutoArp; BOOLEAN SendGUID; BOOLEAN DhcpDiscoverValid; BOOLEAN DhcpAckReceived; BOOLEAN ProxyOfferReceived; BOOLEAN PxeDiscoverValid; BOOLEAN PxeReplyReceived; BOOLEAN PxeBisReplyReceived; BOOLEAN IcmpErrorReceived; BOOLEAN TftpErrorReceived; BOOLEAN MakeCallbacks; UINT8 TTL; UINT8 ToS; UINT8 Reserved; UINT8 StationIp[16]; UINT8 SubnetMask[16]; UINT8 DhcpDiscover[1472]; UINT8 DhcpAck[1472]; UINT8 ProxyOffer[1472]; UINT8 PxeDiscover[1472]; UINT8 PxeReply[1472]; UINT8 PxeBisReply[1472]; } EFI_PXE_BASE_CODE_MODE; typedef struct { UINT64 Revision; void *Start; void *Stop; void *Dhcp; void *Discover; void *Mtftp; void *UdpWrite; void *UdpRead; void *SetIpFilter; void *Arp; void *SetParameters; void *SetStationIp; void *SetPackets; EFI_PXE_BASE_CODE_MODE *Mode; } EFI_PXE_BASE_CODE_PROTOCOL; enum { Tftp_READ = 1, Tftp_WRITE = 2, Tftp_DATA = 3, Tftp_ACK = 4, Tftp_ERROR = 5, Tftp_OACK = 6, TftpPort = 69, Segsize = 512, }; static EFI_GUID EFI_PXE_BASE_CODE_PROTOCOL_GUID = { 0x03C4E603, 0xAC28, 0x11D3, 0x9A, 0x2D, 0x00, 0x90, 0x27, 0x3F, 0xC1, 0x4D, }; static EFI_PXE_BASE_CODE_PROTOCOL *pxe; static uchar mymac[6]; static uchar myip[16]; static uchar serverip[16]; typedef struct Tftp Tftp; struct Tftp { EFI_IP_ADDRESS sip; EFI_IP_ADDRESS dip; EFI_PXE_BASE_CODE_UDP_PORT sport; EFI_PXE_BASE_CODE_UDP_PORT dport; char *rp; char *ep; int seq; int eof; char pkt[2+2+Segsize]; char nul; }; static void puts(void *x, ushort v) { uchar *p = x; p[1] = (v>>8) & 0xFF; p[0] = v & 0xFF; } static ushort gets(void *x) { uchar *p = x; return p[1]<<8 | p[0]; } static void hnputs(void *x, ushort v) { uchar *p = x; p[0] = (v>>8) & 0xFF; p[1] = v & 0xFF; } static ushort nhgets(void *x) { uchar *p = x; return p[0]<<8 | p[1]; } enum { ANY_SRC_IP = 0x0001, ANY_SRC_PORT = 0x0002, ANY_DEST_IP = 0x0004, ANY_DEST_PORT = 0x0008, USE_FILTER = 0x0010, MAY_FRAGMENT = 0x0020, }; static int udpread(EFI_IP_ADDRESS *sip, EFI_IP_ADDRESS *dip, EFI_PXE_BASE_CODE_UDP_PORT *sport, EFI_PXE_BASE_CODE_UDP_PORT dport, int *len, void *data) { UINTN size; size = *len; if(eficall(pxe->UdpRead, pxe, (UINTN)ANY_SRC_PORT, dip, &dport, sip, sport, nil, nil, &size, data)) return -1; *len = size; return 0; } static int udpwrite(EFI_IP_ADDRESS *dip, EFI_PXE_BASE_CODE_UDP_PORT sport, EFI_PXE_BASE_CODE_UDP_PORT dport, int len, void *data) { UINTN size; size = len; if(eficall(pxe->UdpWrite, pxe, (UINTN)MAY_FRAGMENT, dip, &dport, nil, nil, &sport, nil, nil, &size, data)) return -1; return 0; } static int pxeread(void *f, void *data, int len) { Tftp *t = f; int seq, n; while(!t->eof && t->rp >= t->ep){ for(;;){ n = sizeof(t->pkt); if(udpread(&t->dip, &t->sip, &t->dport, t->sport, &n, t->pkt)) continue; if(n >= 4) break; } switch(nhgets(t->pkt)){ case Tftp_DATA: seq = nhgets(t->pkt+2); if(seq > t->seq){ putc('?'); continue; } hnputs(t->pkt, Tftp_ACK); while(udpwrite(&t->dip, t->sport, t->dport, 4, t->pkt)) putc('!'); if(seq < t->seq){ putc('@'); continue; } t->seq = seq+1; n -= 4; t->rp = t->pkt + 4; t->ep = t->rp + n; t->eof = n < Segsize; break; case Tftp_ERROR: print(t->pkt+4); print("\n"); default: t->eof = 1; return -1; } break; } n = t->ep - t->rp; if(len > n) len = n; memmove(data, t->rp, len); t->rp += len; return len; } static void pxeclose(void *f) { Tftp *t = f; t->eof = 1; } static int tftpopen(Tftp *t, char *path) { static EFI_PXE_BASE_CODE_UDP_PORT xport = 6666; int r, n; char *p; t->sport = xport++; t->dport = 0; t->rp = t->ep = 0; t->seq = 1; t->eof = 0; t->nul = 0; p = t->pkt; hnputs(p, Tftp_READ); p += 2; n = strlen(path)+1; memmove(p, path, n); p += n; memmove(p, "octet", 6); p += 6; n = p - t->pkt; for(;;){ if(r = udpwrite(&t->dip, t->sport, TftpPort, n, t->pkt)) break; if(r = pxeread(t, 0, 0)) break; return 0; } pxeclose(t); return r; } static void* pxeopen(char *name) { static uchar buf[sizeof(Tftp)+8]; Tftp *t = (Tftp*)((uintptr)(buf+7)&~7); memset(t, 0, sizeof(Tftp)); memmove(&t->sip, myip, sizeof(myip)); memmove(&t->dip, serverip, sizeof(serverip)); if(tftpopen(t, name)) return nil; return t; } static int parseipv6(uchar to[16], char *from) { int i, dig, elipsis; char *p; elipsis = 0; memset(to, 0, 16); for(i = 0; i < 16; i += 2){ dig = 0; for(p = from;; p++){ if(*p >= '0' && *p <= '9') dig = (dig << 4) | (*p - '0'); else if(*p >= 'a' && *p <= 'f') dig = (dig << 4) | (*p - 'a'+10); else if(*p >= 'A' && *p <= 'F') dig = (dig << 4) | (*p - 'A'+10); else break; if(dig > 0xFFFF) return -1; } to[i] = dig>>8; to[i+1] = dig; if(*p == ':'){ if(*++p == ':'){ /* :: is elided zero short(s) */ if (elipsis) return -1; /* second :: */ elipsis = i+2; p++; } } else if (p == from) break; from = p; } if(i < 16){ memmove(&to[elipsis+16-i], &to[elipsis], i-elipsis); memset(&to[elipsis], 0, 16-i); } return 0; } static void parsedhcp(EFI_PXE_BASE_CODE_DHCPV4_PACKET *dhcp) { uchar *p, *e; char *x; int opt; int len; uint type; memset(mymac, 0, sizeof(mymac)); memset(serverip, 0, sizeof(serverip)); /* DHCPv4 */ if(pxe->Mode->UsingIpv6 == 0){ memmove(mymac, dhcp->BootpHwAddr, 6); memmove(serverip, dhcp->BootpSiAddr, 4); return; } /* DHCPv6 */ /* * some UEFI implementations use random UUID based DUID instead of * ethernet address, but use ethernet derived link-local addresses. * so extract the MAC from our IPv6 address as a fallback. */ p = pxe->Mode->StationIp; mymac[0] = p[8] ^ 2; mymac[1] = p[9]; mymac[2] = p[10]; mymac[3] = p[13]; mymac[4] = p[14]; mymac[5] = p[15]; e = (uchar*)dhcp + sizeof(*dhcp); p = (uchar*)dhcp + 4; while(p+4 <= e){ opt = p[0]<<8 | p[1]; len = p[2]<<8 | p[3]; p += 4; if(p + len > e) break; switch(opt){ case 1: /* Client DUID */ if(len < 4+6) break; type = p[0]<<24 | p[1]<<16 | p[2]<<8 | p[3]; switch(type){ case 0x00010001: case 0x00030001: memmove(mymac, p+len-6, 6); break; } break; case 59: /* Boot File URL */ for(x = (char*)p; x < (char*)p+len; x++){ if(*x == '['){ parseipv6(serverip, x+1); break; } } break; } p += len; } } int pxeinit(void **pf) { EFI_PXE_BASE_CODE_DHCPV4_PACKET *dhcp; EFI_PXE_BASE_CODE_MODE *mode; EFI_HANDLE *Handles; UINTN Count; int i; pxe = nil; Count = 0; Handles = nil; if(eficall(ST->BootServices->LocateHandleBuffer, ByProtocol, &EFI_PXE_BASE_CODE_PROTOCOL_GUID, nil, &Count, &Handles)) return -1; for(i=0; i<Count; i++){ pxe = nil; if(eficall(ST->BootServices->HandleProtocol, Handles[i], &EFI_PXE_BASE_CODE_PROTOCOL_GUID, &pxe)) continue; mode = pxe->Mode; if(mode == nil || mode->Started == 0) continue; if(mode->DhcpAckReceived){ dhcp = (EFI_PXE_BASE_CODE_DHCPV4_PACKET*)mode->DhcpAck; goto Found; } if(mode->PxeReplyReceived){ dhcp = (EFI_PXE_BASE_CODE_DHCPV4_PACKET*)mode->PxeReply; goto Found; } } return -1; Found: parsedhcp(dhcp); memmove(myip, mode->StationIp, 16); open = pxeopen; read = pxeread; close = pxeclose; if(pf != nil){ char ini[24]; memmove(ini, "/cfg/pxe/", 9); for(i=0; i<6; i++){ ini[9+i*2+0] = hex[mymac[i] >> 4]; ini[9+i*2+1] = hex[mymac[i] & 0xF]; } ini[9+12] = '\0'; if((*pf = pxeopen(ini)) == nil) *pf = pxeopen("/cfg/pxe/default"); } return 0; }