--- /dev/null
+/***********************************************************************
+*
+* 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: pppoe.h,v 1.4 2008/06/15 04:35:50 paulus Exp $
+*
+***********************************************************************/
+
+#include "config.h"
+
+#include <stdio.h> /* For FILE */
+#include <sys/types.h> /* For pid_t */
+#include <ctype.h>
+#include <string.h>
+
+#include "pppd/pppd.h" /* For error */
+
+/* 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_SYS_DLPI_H)
+#define USE_DLPI
+#elif defined(HAVE_NET_BPF_H)
+#define USE_BPF 1
+#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_SOCKET_H
+#include <sys/socket.h>
+#endif
+
+/* This has to be included before Linux 4.8's linux/in.h
+ * gets dragged in. */
+#include <netinet/in.h>
+
+/* Ugly header files on some Linux boxes... */
+#if defined(HAVE_LINUX_IF_H)
+#include <linux/if.h>
+#elif defined(HAVE_NET_IF_H)
+#include <net/if.h>
+#endif
+
+#ifdef HAVE_NET_IF_TYPES_H
+#include <net/if_types.h>
+#endif
+
+#define BPF_BUFFER_IS_EMPTY 1
+#define BPF_BUFFER_HAS_DATA 0
+
+/* 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 32-bit integer type
+#endif
+
+#ifdef HAVE_LINUX_IF_ETHER_H
+#include <linux/if_ether.h>
+#else
+
+#ifdef HAVE_NETINET_IF_ETHER_H
+#include <sys/types.h>
+
+#ifdef HAVE_SYS_SOCKET_H
+#include <sys/socket.h>
+#endif
+#ifndef HAVE_SYS_DLPI_H
+#include <netinet/if_ether.h>
+#endif
+#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
+
+/* Extensions from draft-carrel-info-pppoe-ext-00 */
+/* I do NOT like PADM or PADN, but they are here for completeness */
+#define CODE_PADM 0xD3
+#define CODE_PADN 0xD4
+
+#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_PPP_MAX_PAYLOAD 0x0120
+#define TAG_SERVICE_NAME_ERROR 0x0201
+#define TAG_AC_SYSTEM_ERROR 0x0202
+#define TAG_GENERIC_ERROR 0x0203
+
+/* Extensions from draft-carrel-info-pppoe-ext-00 */
+/* I do NOT like these tags one little bit */
+#define TAG_HURL 0x111
+#define TAG_MOTM 0x112
+#define TAG_IP_ROUTE_ADD 0x121
+
+/* 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
+
+/* There are other fixed-size buffers preventing
+ this from being increased to 16110. The buffer
+ sizes would need to be properly de-coupled from
+ the default MRU. For now, getting up to 1500 is
+ enough. */
+#define ETH_JUMBO_LEN 1508
+
+/* A PPPoE Packet, including Ethernet headers */
+typedef struct PPPoEPacketStruct {
+ struct ethhdr ethHdr; /* Ethernet header */
+ unsigned int vertype:8; /* PPPoE Version and Type (must both be 1) */
+ unsigned int code:8; /* PPPoE code */
+ unsigned int session:16; /* PPPoE session */
+ unsigned int length:16; /* Payload length */
+ unsigned char payload[ETH_JUMBO_LEN]; /* A bit of room to spare */
+} PPPoEPacket;
+
+#define PPPOE_VER(vt) ((vt) >> 4)
+#define PPPOE_TYPE(vt) ((vt) & 0xf)
+#define PPPOE_VER_TYPE(v, t) (((v) << 4) | (t))
+
+/* 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_JUMBO_LEN - PPPOE_OVERHEAD)
+#define PPP_OVERHEAD 2 /* protocol */
+#define MAX_PPPOE_MTU (MAX_PPPOE_PAYLOAD - PPP_OVERHEAD)
+#define TOTAL_OVERHEAD (PPPOE_OVERHEAD + PPP_OVERHEAD)
+#define ETH_PPPOE_MTU (ETH_DATA_LEN - TOTAL_OVERHEAD)
+
+/* PPPoE Tag */
+
+typedef struct PPPoETagStruct {
+ unsigned int type:16; /* tag type */
+ unsigned int length:16; /* Length of payload */
+ unsigned char payload[ETH_JUMBO_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);
+
+#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 */
+ unsigned char req_peer_mac[ETH_ALEN]; /* required peer MAC address */
+ unsigned char req_peer; /* require mac addr to match req_peer_mac */
+ 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 */
+ PPPoETag hostUniq; /* Use Host-Uniq tag */
+ int printACNames; /* Just print AC names */
+ 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 */
+ int error; /* Error packet received */
+ int debug; /* Set to log packets sent and received */
+ int discoveryTimeout; /* Timeout for discovery packets */
+ int discoveryAttempts; /* Number of discovery attempts */
+ int seenMaxPayload;
+ int mtu; /* Stored MTU */
+ int mru; /* Stored MRU */
+} PPPoEConnection;
+
+/* Structure used to determine acceptable PADO or PADS packet */
+struct PacketCriteria {
+ PPPoEConnection *conn;
+ int acNameOK;
+ int serviceNameOK;
+ int seenACName;
+ int seenServiceName;
+};
+
+/* 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);
+
+void pppoe_printpkt(PPPoEPacket *packet,
+ void (*printer)(void *, char *, ...), void *arg);
+void pppoe_log_packet(const char *prefix, PPPoEPacket *packet);
+
+static inline int parseHostUniq(const char *uniq, PPPoETag *tag)
+{
+ unsigned i, len = strlen(uniq);
+
+#define hex(x) \
+ (((x) <= '9') ? ((x) - '0') : \
+ (((x) <= 'F') ? ((x) - 'A' + 10) : \
+ ((x) - 'a' + 10)))
+
+ if (!len || len % 2 || len / 2 > sizeof(tag->payload))
+ return 0;
+
+ for (i = 0; i < len; i += 2) {
+ if (!isxdigit(uniq[i]) || !isxdigit(uniq[i+1]))
+ return 0;
+
+ tag->payload[i / 2] = (char)(hex(uniq[i]) << 4 | hex(uniq[i+1]));
+ }
+
+#undef hex
+
+ tag->type = htons(TAG_HOST_UNIQ);
+ tag->length = htons(len / 2);
+ return 1;
+}
+
+#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) { \
+ error("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)
projects / ppp.git / blobdiff