/*********************************************************************** * * pppoe.h * * Declaration of various PPPoE constants * * Copyright (C) 2000 Roaring Penguin Software Inc. * * This program may be distributed according to the terms of the GNU * General Public License, version 2 or (at your option) any later version. * * $Id$ * ***********************************************************************/ #ifdef __sun__ #define __EXTENSIONS__ #endif #include "config.h" #if defined(HAVE_NETPACKET_PACKET_H) || defined(HAVE_LINUX_IF_PACKET_H) #define _POSIX_SOURCE 1 /* For sigaction defines */ #endif #include /* For FILE */ #include /* For pid_t */ /* How do we access raw Ethernet devices? */ #undef USE_LINUX_PACKET #undef USE_BPF #if defined(HAVE_NETPACKET_PACKET_H) || defined(HAVE_LINUX_IF_PACKET_H) #define USE_LINUX_PACKET 1 #elif defined(HAVE_NET_BPF_H) #define USE_BPF 1 #elif defined(HAVE_SYS_DLPI_H) #define USE_DLPI #endif /* Sanity check */ #if !defined(USE_BPF) && !defined(USE_LINUX_PACKET) && !defined(USE_DLPI) #error Unknown method for accessing raw Ethernet frames #endif #ifdef HAVE_SYS_CDEFS_H #include #endif #ifdef HAVE_SYS_SOCKET_H #include #endif /* Ugly header files on some Linux boxes... */ #if defined(HAVE_LINUX_IF_H) #include #elif defined(HAVE_NET_IF_H) #include #endif #ifdef HAVE_NET_IF_TYPES_H #include #endif #ifdef HAVE_NET_IF_DL_H #include #endif /* I'm not sure why this is needed... I do not have OpenBSD */ #if defined(__OpenBSD__) #include #include #endif #ifdef USE_BPF extern int bpfSize; struct PPPoEPacketStruct; void sessionDiscoveryPacket(struct PPPoEPacketStruct *packet); #define BPF_BUFFER_IS_EMPTY (bpfSize <= 0) #define BPF_BUFFER_HAS_DATA (bpfSize > 0) #define ethhdr ether_header #define h_dest ether_dhost #define h_source ether_shost #define h_proto ether_type #define ETH_DATA_LEN ETHERMTU #define ETH_ALEN ETHER_ADDR_LEN #else #undef USE_BPF #define BPF_BUFFER_IS_EMPTY 1 #define BPF_BUFFER_HAS_DATA 0 #endif #ifdef USE_DLPI #include #define ethhdr ether_header #define ETH_DATA_LEN ETHERMTU #define ETH_ALEN ETHERADDRL #define h_dest ether_dhost.ether_addr_octet #define h_source ether_shost.ether_addr_octet #define h_proto ether_type /* cloned from dltest.h */ #define MAXDLBUF 8192 #define MAXDLADDR 1024 #define MAXWAIT 15 #define OFFADDR(s, n) (u_char*)((char*)(s) + (int)(n)) #define CASERET(s) case s: return ("s") #endif /* Define various integer types -- assumes a char is 8 bits */ #if SIZEOF_UNSIGNED_SHORT == 2 typedef unsigned short UINT16_t; #elif SIZEOF_UNSIGNED_INT == 2 typedef unsigned int UINT16_t; #else #error Could not find a 16-bit integer type #endif #if SIZEOF_UNSIGNED_SHORT == 4 typedef unsigned short UINT32_t; #elif SIZEOF_UNSIGNED_INT == 4 typedef unsigned int UINT32_t; #elif SIZEOF_UNSIGNED_LONG == 4 typedef unsigned long UINT32_t; #else #error Could not find a 16-bit integer type #endif #ifdef HAVE_LINUX_IF_ETHER_H #include #endif #include #ifdef HAVE_NETINET_IF_ETHER_H #include #ifdef HAVE_SYS_SOCKET_H #include #endif #ifndef HAVE_SYS_DLPI_H #include #endif #endif /* Ethernet frame types according to RFC 2516 */ #define ETH_PPPOE_DISCOVERY 0x8863 #define ETH_PPPOE_SESSION 0x8864 /* But some brain-dead peers disobey the RFC, so frame types are variables */ extern UINT16_t Eth_PPPOE_Discovery; extern UINT16_t Eth_PPPOE_Session; /* PPPoE codes */ #define CODE_PADI 0x09 #define CODE_PADO 0x07 #define CODE_PADR 0x19 #define CODE_PADS 0x65 #define CODE_PADT 0xA7 #define CODE_SESS 0x00 /* PPPoE Tags */ #define TAG_END_OF_LIST 0x0000 #define TAG_SERVICE_NAME 0x0101 #define TAG_AC_NAME 0x0102 #define TAG_HOST_UNIQ 0x0103 #define TAG_AC_COOKIE 0x0104 #define TAG_VENDOR_SPECIFIC 0x0105 #define TAG_RELAY_SESSION_ID 0x0110 #define TAG_SERVICE_NAME_ERROR 0x0201 #define TAG_AC_SYSTEM_ERROR 0x0202 #define TAG_GENERIC_ERROR 0x0203 /* Discovery phase states */ #define STATE_SENT_PADI 0 #define STATE_RECEIVED_PADO 1 #define STATE_SENT_PADR 2 #define STATE_SESSION 3 #define STATE_TERMINATED 4 /* How many PADI/PADS attempts? */ #define MAX_PADI_ATTEMPTS 3 /* Initial timeout for PADO/PADS */ #define PADI_TIMEOUT 5 /* States for scanning PPP frames */ #define STATE_WAITFOR_FRAME_ADDR 0 #define STATE_DROP_PROTO 1 #define STATE_BUILDING_PACKET 2 /* Special PPP frame characters */ #define FRAME_ESC 0x7D #define FRAME_FLAG 0x7E #define FRAME_ADDR 0xFF #define FRAME_CTRL 0x03 #define FRAME_ENC 0x20 #define IPV4ALEN 4 #define SMALLBUF 256 /* A PPPoE Packet, including Ethernet headers */ typedef struct PPPoEPacketStruct { struct ethhdr ethHdr; /* Ethernet header */ #ifdef PACK_BITFIELDS_REVERSED unsigned int type:4; /* PPPoE Type (must be 1) */ unsigned int ver:4; /* PPPoE Version (must be 1) */ #else unsigned int ver:4; /* PPPoE Version (must be 1) */ unsigned int type:4; /* PPPoE Type (must be 1) */ #endif unsigned int code:8; /* PPPoE code */ unsigned int session:16; /* PPPoE session */ unsigned int length:16; /* Payload length */ unsigned char payload[ETH_DATA_LEN]; /* A bit of room to spare */ } PPPoEPacket; /* Header size of a PPPoE packet */ #define PPPOE_OVERHEAD 6 /* type, code, session, length */ #define HDR_SIZE (sizeof(struct ethhdr) + PPPOE_OVERHEAD) #define MAX_PPPOE_PAYLOAD (ETH_DATA_LEN - PPPOE_OVERHEAD) #define MAX_PPPOE_MTU (MAX_PPPOE_PAYLOAD - 2) /* PPPoE Tag */ typedef struct PPPoETagStruct { unsigned int type:16; /* tag type */ unsigned int length:16; /* Length of payload */ unsigned char payload[ETH_DATA_LEN]; /* A LOT of room to spare */ } PPPoETag; /* Header size of a PPPoE tag */ #define TAG_HDR_SIZE 4 /* Chunk to read from stdin */ #define READ_CHUNK 4096 /* Function passed to parsePacket */ typedef void ParseFunc(UINT16_t type, UINT16_t len, unsigned char *data, void *extra); /* Structures used by PPPoE server */ struct ClientSession { pid_t pid; /* PID of child handling session */ unsigned char ip[IPV4ALEN]; /* IP address of peer */ UINT16_t sess; /* Session number */ unsigned char eth[ETH_ALEN]; /* Peer's Ethernet address */ int recvdPADT; /* Peer sent a PADT */ }; #define PPPINITFCS16 0xffff /* Initial FCS value */ /* Keep track of the state of a connection -- collect everything in one spot */ typedef struct PPPoEConnectionStruct { int discoveryState; /* Where we are in discovery */ int discoverySocket; /* Raw socket for discovery frames */ int sessionSocket; /* Raw socket for session frames */ unsigned char myEth[ETH_ALEN]; /* My MAC address */ unsigned char peerEth[ETH_ALEN]; /* Peer's MAC address */ UINT16_t session; /* Session ID */ char *ifName; /* Interface name */ char *serviceName; /* Desired service name, if any */ char *acName; /* Desired AC name, if any */ int synchronous; /* Use synchronous PPP */ int useHostUniq; /* Use Host-Uniq tag */ int printACNames; /* Just print AC names */ int skipDiscovery; /* Skip discovery */ int noDiscoverySocket; /* Don't even open discovery socket */ int killSession; /* Kill session and exit */ FILE *debugFile; /* Debug file for dumping packets */ int numPADOs; /* Number of PADO packets received */ PPPoETag cookie; /* We have to send this if we get it */ PPPoETag relayId; /* Ditto */ } PPPoEConnection; /* Structure used to determine acceptable PADO or PADS packet */ struct PacketCriteria { PPPoEConnection *conn; int acNameOK; int serviceNameOK; }; /* Function Prototypes */ UINT16_t etherType(PPPoEPacket *packet); int openInterface(char const *ifname, UINT16_t type, unsigned char *hwaddr); int sendPacket(PPPoEConnection *conn, int sock, PPPoEPacket *pkt, int size); int receivePacket(int sock, PPPoEPacket *pkt, int *size); void fatalSys(char const *str); void rp_fatal(char const *str); void printErr(char const *str); void sysErr(char const *str); void dumpPacket(FILE *fp, PPPoEPacket *packet, char const *dir); void dumpHex(FILE *fp, unsigned char const *buf, int len); int parsePacket(PPPoEPacket *packet, ParseFunc *func, void *extra); void parseLogErrs(UINT16_t typ, UINT16_t len, unsigned char *data, void *xtra); void syncReadFromPPP(PPPoEConnection *conn, PPPoEPacket *packet); void asyncReadFromPPP(PPPoEConnection *conn, PPPoEPacket *packet); void asyncReadFromEth(PPPoEConnection *conn, int sock, int clampMss); void syncReadFromEth(PPPoEConnection *conn, int sock, int clampMss); char *strDup(char const *str); void sendPADT(PPPoEConnection *conn, char const *msg); void sendSessionPacket(PPPoEConnection *conn, PPPoEPacket *packet, int len); void initPPP(void); void clampMSS(PPPoEPacket *packet, char const *dir, int clampMss); UINT16_t computeTCPChecksum(unsigned char *ipHdr, unsigned char *tcpHdr); UINT16_t pppFCS16(UINT16_t fcs, unsigned char *cp, int len); void discovery(PPPoEConnection *conn); unsigned char *findTag(PPPoEPacket *packet, UINT16_t tagType, PPPoETag *tag); #define SET_STRING(var, val) do { if (var) free(var); var = strDup(val); } while(0); #define CHECK_ROOM(cursor, start, len) \ do {\ if (((cursor)-(start))+(len) > MAX_PPPOE_PAYLOAD) { \ syslog(LOG_ERR, "Would create too-long packet"); \ return; \ } \ } while(0) /* True if Ethernet address is broadcast or multicast */ #define NOT_UNICAST(e) ((e[0] & 0x01) != 0) #define BROADCAST(e) ((e[0] & e[1] & e[2] & e[3] & e[4] & e[5]) == 0xFF) #define NOT_BROADCAST(e) ((e[0] & e[1] & e[2] & e[3] & e[4] & e[5]) != 0xFF)