X-Git-Url: https://git.ozlabs.org/?p=ppp.git;a=blobdiff_plain;f=pppd%2Fplugins%2Frp-pppoe%2Fdiscovery.c;fp=pppd%2Fplugins%2Frp-pppoe%2Fdiscovery.c;h=0000000000000000000000000000000000000000;hp=23089df550771f2a795c1e54b8d197b6bdc5e492;hb=b2c36e6c0e1655aea9b1b0a03a8160f42a26c884;hpb=f1e3aa2dc7e7772d8491c6ff61e4e6d28af33d4b diff --git a/pppd/plugins/rp-pppoe/discovery.c b/pppd/plugins/rp-pppoe/discovery.c deleted file mode 100644 index 23089df..0000000 --- a/pppd/plugins/rp-pppoe/discovery.c +++ /dev/null @@ -1,666 +0,0 @@ -/*********************************************************************** -* -* discovery.c -* -* Perform PPPoE discovery -* -* Copyright (C) 1999 by Roaring Penguin Software Inc. -* -***********************************************************************/ - -static char const RCSID[] = -"$Id: discovery.c,v 1.6 2008/06/15 04:35:50 paulus Exp $"; - -#define _GNU_SOURCE 1 -#include "pppoe.h" -#include "pppd/pppd.h" -#include "pppd/fsm.h" -#include "pppd/lcp.h" - -#include -#include -#include - -#ifdef HAVE_SYS_TIME_H -#include -#endif - -#ifdef HAVE_SYS_UIO_H -#include -#endif - -#ifdef HAVE_UNISTD_H -#include -#endif - -#ifdef USE_LINUX_PACKET -#include -#include -#endif - -#include - -/* Calculate time remaining until *exp, return 0 if now >= *exp */ -static int time_left(struct timeval *diff, struct timeval *exp) -{ - struct timeval now; - - if (get_time(&now) < 0) { - error("get_time: %m"); - return 0; - } - - if (now.tv_sec > exp->tv_sec - || (now.tv_sec == exp->tv_sec && now.tv_usec >= exp->tv_usec)) - return 0; - - diff->tv_sec = exp->tv_sec - now.tv_sec; - diff->tv_usec = exp->tv_usec - now.tv_usec; - if (diff->tv_usec < 0) { - diff->tv_usec += 1000000; - --diff->tv_sec; - } - - return 1; -} - -/********************************************************************** -*%FUNCTION: parseForHostUniq -*%ARGUMENTS: -* type -- tag type -* len -- tag length -* data -- tag data. -* extra -- user-supplied pointer. This is assumed to be a pointer to int. -*%RETURNS: -* Nothing -*%DESCRIPTION: -* If a HostUnique tag is found which matches our PID, sets *extra to 1. -***********************************************************************/ -static void -parseForHostUniq(UINT16_t type, UINT16_t len, unsigned char *data, - void *extra) -{ - PPPoETag *tag = extra; - - if (type == TAG_HOST_UNIQ && len == ntohs(tag->length)) - tag->length = memcmp(data, tag->payload, len); -} - -/********************************************************************** -*%FUNCTION: packetIsForMe -*%ARGUMENTS: -* conn -- PPPoE connection info -* packet -- a received PPPoE packet -*%RETURNS: -* 1 if packet is for this PPPoE daemon; 0 otherwise. -*%DESCRIPTION: -* If we are using the Host-Unique tag, verifies that packet contains -* our unique identifier. -***********************************************************************/ -static int -packetIsForMe(PPPoEConnection *conn, PPPoEPacket *packet) -{ - PPPoETag hostUniq = conn->hostUniq; - - /* If packet is not directed to our MAC address, forget it */ - if (memcmp(packet->ethHdr.h_dest, conn->myEth, ETH_ALEN)) return 0; - - /* If we're not using the Host-Unique tag, then accept the packet */ - if (!conn->hostUniq.length) return 1; - - parsePacket(packet, parseForHostUniq, &hostUniq); - return !hostUniq.length; -} - -/********************************************************************** -*%FUNCTION: parsePADOTags -*%ARGUMENTS: -* type -- tag type -* len -- tag length -* data -- tag data -* extra -- extra user data. Should point to a PacketCriteria structure -* which gets filled in according to selected AC name and service -* name. -*%RETURNS: -* Nothing -*%DESCRIPTION: -* Picks interesting tags out of a PADO packet -***********************************************************************/ -static void -parsePADOTags(UINT16_t type, UINT16_t len, unsigned char *data, - void *extra) -{ - struct PacketCriteria *pc = (struct PacketCriteria *) extra; - PPPoEConnection *conn = pc->conn; - UINT16_t mru; - int i; - - switch(type) { - case TAG_AC_NAME: - pc->seenACName = 1; - if (conn->printACNames) { - info("Access-Concentrator: %.*s", (int) len, data); - } - if (conn->acName && len == strlen(conn->acName) && - !strncmp((char *) data, conn->acName, len)) { - pc->acNameOK = 1; - } - break; - case TAG_SERVICE_NAME: - pc->seenServiceName = 1; - if (conn->serviceName && len == strlen(conn->serviceName) && - !strncmp((char *) data, conn->serviceName, len)) { - pc->serviceNameOK = 1; - } - break; - case TAG_AC_COOKIE: - conn->cookie.type = htons(type); - conn->cookie.length = htons(len); - memcpy(conn->cookie.payload, data, len); - break; - case TAG_RELAY_SESSION_ID: - conn->relayId.type = htons(type); - conn->relayId.length = htons(len); - memcpy(conn->relayId.payload, data, len); - break; - case TAG_PPP_MAX_PAYLOAD: - if (len == sizeof(mru)) { - memcpy(&mru, data, sizeof(mru)); - mru = ntohs(mru); - if (mru >= ETH_PPPOE_MTU) { - if (lcp_allowoptions[0].mru > mru) - lcp_allowoptions[0].mru = mru; - if (lcp_wantoptions[0].mru > mru) - lcp_wantoptions[0].mru = mru; - conn->seenMaxPayload = 1; - } - } - break; - case TAG_SERVICE_NAME_ERROR: - error("PADO: Service-Name-Error: %.*s", (int) len, data); - conn->error = 1; - break; - case TAG_AC_SYSTEM_ERROR: - error("PADO: System-Error: %.*s", (int) len, data); - conn->error = 1; - break; - case TAG_GENERIC_ERROR: - error("PADO: Generic-Error: %.*s", (int) len, data); - conn->error = 1; - break; - } -} - -/********************************************************************** -*%FUNCTION: parsePADSTags -*%ARGUMENTS: -* type -- tag type -* len -- tag length -* data -- tag data -* extra -- extra user data (pointer to PPPoEConnection structure) -*%RETURNS: -* Nothing -*%DESCRIPTION: -* Picks interesting tags out of a PADS packet -***********************************************************************/ -static void -parsePADSTags(UINT16_t type, UINT16_t len, unsigned char *data, - void *extra) -{ - PPPoEConnection *conn = (PPPoEConnection *) extra; - UINT16_t mru; - switch(type) { - case TAG_SERVICE_NAME: - dbglog("PADS: Service-Name: '%.*s'", (int) len, data); - break; - case TAG_PPP_MAX_PAYLOAD: - if (len == sizeof(mru)) { - memcpy(&mru, data, sizeof(mru)); - mru = ntohs(mru); - if (mru >= ETH_PPPOE_MTU) { - if (lcp_allowoptions[0].mru > mru) - lcp_allowoptions[0].mru = mru; - if (lcp_wantoptions[0].mru > mru) - lcp_wantoptions[0].mru = mru; - conn->seenMaxPayload = 1; - } - } - break; - case TAG_SERVICE_NAME_ERROR: - error("PADS: Service-Name-Error: %.*s", (int) len, data); - conn->error = 1; - break; - case TAG_AC_SYSTEM_ERROR: - error("PADS: System-Error: %.*s", (int) len, data); - conn->error = 1; - break; - case TAG_GENERIC_ERROR: - error("PADS: Generic-Error: %.*s", (int) len, data); - conn->error = 1; - break; - case TAG_RELAY_SESSION_ID: - conn->relayId.type = htons(type); - conn->relayId.length = htons(len); - memcpy(conn->relayId.payload, data, len); - break; - } -} - -/*********************************************************************** -*%FUNCTION: sendPADI -*%ARGUMENTS: -* conn -- PPPoEConnection structure -*%RETURNS: -* Nothing -*%DESCRIPTION: -* Sends a PADI packet -***********************************************************************/ -static void -sendPADI(PPPoEConnection *conn) -{ - PPPoEPacket packet; - unsigned char *cursor = packet.payload; - PPPoETag *svc = (PPPoETag *) (&packet.payload); - UINT16_t namelen = 0; - UINT16_t plen; - int omit_service_name = 0; - - if (conn->serviceName) { - namelen = (UINT16_t) strlen(conn->serviceName); - if (!strcmp(conn->serviceName, "NO-SERVICE-NAME-NON-RFC-COMPLIANT")) { - omit_service_name = 1; - } - } - - /* Set destination to Ethernet broadcast address */ - memset(packet.ethHdr.h_dest, 0xFF, ETH_ALEN); - memcpy(packet.ethHdr.h_source, conn->myEth, ETH_ALEN); - - packet.ethHdr.h_proto = htons(Eth_PPPOE_Discovery); - packet.vertype = PPPOE_VER_TYPE(1, 1); - packet.code = CODE_PADI; - packet.session = 0; - - if (!omit_service_name) { - plen = TAG_HDR_SIZE + namelen; - CHECK_ROOM(cursor, packet.payload, plen); - - svc->type = TAG_SERVICE_NAME; - svc->length = htons(namelen); - - if (conn->serviceName) { - memcpy(svc->payload, conn->serviceName, strlen(conn->serviceName)); - } - cursor += namelen + TAG_HDR_SIZE; - } else { - plen = 0; - } - - /* If we're using Host-Uniq, copy it over */ - if (conn->hostUniq.length) { - int len = ntohs(conn->hostUniq.length); - CHECK_ROOM(cursor, packet.payload, len + TAG_HDR_SIZE); - memcpy(cursor, &conn->hostUniq, len + TAG_HDR_SIZE); - cursor += len + TAG_HDR_SIZE; - plen += len + TAG_HDR_SIZE; - } - - /* Add our maximum MTU/MRU */ - if (MIN(lcp_allowoptions[0].mru, lcp_wantoptions[0].mru) > ETH_PPPOE_MTU) { - PPPoETag maxPayload; - UINT16_t mru = htons(MIN(lcp_allowoptions[0].mru, lcp_wantoptions[0].mru)); - maxPayload.type = htons(TAG_PPP_MAX_PAYLOAD); - maxPayload.length = htons(sizeof(mru)); - memcpy(maxPayload.payload, &mru, sizeof(mru)); - CHECK_ROOM(cursor, packet.payload, sizeof(mru) + TAG_HDR_SIZE); - memcpy(cursor, &maxPayload, sizeof(mru) + TAG_HDR_SIZE); - cursor += sizeof(mru) + TAG_HDR_SIZE; - plen += sizeof(mru) + TAG_HDR_SIZE; - } - - packet.length = htons(plen); - - sendPacket(conn, conn->discoverySocket, &packet, (int) (plen + HDR_SIZE)); -} - -/********************************************************************** -*%FUNCTION: waitForPADO -*%ARGUMENTS: -* conn -- PPPoEConnection structure -* timeout -- how long to wait (in seconds) -*%RETURNS: -* Nothing -*%DESCRIPTION: -* Waits for a PADO packet and copies useful information -***********************************************************************/ -void -waitForPADO(PPPoEConnection *conn, int timeout) -{ - fd_set readable; - int r; - struct timeval tv; - struct timeval expire_at; - - PPPoEPacket packet; - int len; - - struct PacketCriteria pc; - pc.conn = conn; - pc.acNameOK = (conn->acName) ? 0 : 1; - pc.serviceNameOK = (conn->serviceName) ? 0 : 1; - pc.seenACName = 0; - pc.seenServiceName = 0; - conn->seenMaxPayload = 0; - conn->error = 0; - - if (get_time(&expire_at) < 0) { - error("get_time (waitForPADO): %m"); - return; - } - expire_at.tv_sec += timeout; - - do { - if (BPF_BUFFER_IS_EMPTY) { - if (!time_left(&tv, &expire_at)) - return; /* Timed out */ - - FD_ZERO(&readable); - FD_SET(conn->discoverySocket, &readable); - - while(1) { - r = select(conn->discoverySocket+1, &readable, NULL, NULL, &tv); - if (r >= 0 || errno != EINTR || got_sigterm) break; - } - if (r < 0) { - error("select (waitForPADO): %m"); - return; - } - if (r == 0) - return; /* Timed out */ - } - - /* Get the packet */ - receivePacket(conn->discoverySocket, &packet, &len); - - /* Check length */ - if (ntohs(packet.length) + HDR_SIZE > len) { - error("Bogus PPPoE length field (%u)", - (unsigned int) ntohs(packet.length)); - continue; - } - -#ifdef USE_BPF - /* If it's not a Discovery packet, loop again */ - if (etherType(&packet) != Eth_PPPOE_Discovery) continue; -#endif - - /* If it's not for us, loop again */ - if (!packetIsForMe(conn, &packet)) continue; - - if (packet.code == CODE_PADO) { - if (NOT_UNICAST(packet.ethHdr.h_source)) { - error("Ignoring PADO packet from non-unicast MAC address"); - continue; - } - if (conn->req_peer - && memcmp(packet.ethHdr.h_source, conn->req_peer_mac, ETH_ALEN) != 0) { - warn("Ignoring PADO packet from wrong MAC address"); - continue; - } - if (parsePacket(&packet, parsePADOTags, &pc) < 0) - return; - if (conn->error) - return; - if (!pc.seenACName) { - error("Ignoring PADO packet with no AC-Name tag"); - continue; - } - if (!pc.seenServiceName) { - error("Ignoring PADO packet with no Service-Name tag"); - continue; - } - conn->numPADOs++; - if (pc.acNameOK && pc.serviceNameOK) { - memcpy(conn->peerEth, packet.ethHdr.h_source, ETH_ALEN); - conn->discoveryState = STATE_RECEIVED_PADO; - break; - } - } - } while (conn->discoveryState != STATE_RECEIVED_PADO); -} - -/*********************************************************************** -*%FUNCTION: sendPADR -*%ARGUMENTS: -* conn -- PPPoE connection structur -*%RETURNS: -* Nothing -*%DESCRIPTION: -* Sends a PADR packet -***********************************************************************/ -static void -sendPADR(PPPoEConnection *conn) -{ - PPPoEPacket packet; - PPPoETag *svc = (PPPoETag *) packet.payload; - unsigned char *cursor = packet.payload; - - UINT16_t namelen = 0; - UINT16_t plen; - - if (conn->serviceName) { - namelen = (UINT16_t) strlen(conn->serviceName); - } - plen = TAG_HDR_SIZE + namelen; - CHECK_ROOM(cursor, packet.payload, plen); - - memcpy(packet.ethHdr.h_dest, conn->peerEth, ETH_ALEN); - memcpy(packet.ethHdr.h_source, conn->myEth, ETH_ALEN); - - packet.ethHdr.h_proto = htons(Eth_PPPOE_Discovery); - packet.vertype = PPPOE_VER_TYPE(1, 1); - packet.code = CODE_PADR; - packet.session = 0; - - svc->type = TAG_SERVICE_NAME; - svc->length = htons(namelen); - if (conn->serviceName) { - memcpy(svc->payload, conn->serviceName, namelen); - } - cursor += namelen + TAG_HDR_SIZE; - - /* If we're using Host-Uniq, copy it over */ - if (conn->hostUniq.length) { - int len = ntohs(conn->hostUniq.length); - CHECK_ROOM(cursor, packet.payload, len+TAG_HDR_SIZE); - memcpy(cursor, &conn->hostUniq, len + TAG_HDR_SIZE); - cursor += len + TAG_HDR_SIZE; - plen += len + TAG_HDR_SIZE; - } - - /* Add our maximum MTU/MRU */ - if (MIN(lcp_allowoptions[0].mru, lcp_wantoptions[0].mru) > ETH_PPPOE_MTU) { - PPPoETag maxPayload; - UINT16_t mru = htons(MIN(lcp_allowoptions[0].mru, lcp_wantoptions[0].mru)); - maxPayload.type = htons(TAG_PPP_MAX_PAYLOAD); - maxPayload.length = htons(sizeof(mru)); - memcpy(maxPayload.payload, &mru, sizeof(mru)); - CHECK_ROOM(cursor, packet.payload, sizeof(mru) + TAG_HDR_SIZE); - memcpy(cursor, &maxPayload, sizeof(mru) + TAG_HDR_SIZE); - cursor += sizeof(mru) + TAG_HDR_SIZE; - plen += sizeof(mru) + TAG_HDR_SIZE; - } - - /* Copy cookie and relay-ID if needed */ - if (conn->cookie.type) { - CHECK_ROOM(cursor, packet.payload, - ntohs(conn->cookie.length) + TAG_HDR_SIZE); - memcpy(cursor, &conn->cookie, ntohs(conn->cookie.length) + TAG_HDR_SIZE); - cursor += ntohs(conn->cookie.length) + TAG_HDR_SIZE; - plen += ntohs(conn->cookie.length) + TAG_HDR_SIZE; - } - - if (conn->relayId.type) { - CHECK_ROOM(cursor, packet.payload, - ntohs(conn->relayId.length) + TAG_HDR_SIZE); - memcpy(cursor, &conn->relayId, ntohs(conn->relayId.length) + TAG_HDR_SIZE); - cursor += ntohs(conn->relayId.length) + TAG_HDR_SIZE; - plen += ntohs(conn->relayId.length) + TAG_HDR_SIZE; - } - - packet.length = htons(plen); - sendPacket(conn, conn->discoverySocket, &packet, (int) (plen + HDR_SIZE)); -} - -/********************************************************************** -*%FUNCTION: waitForPADS -*%ARGUMENTS: -* conn -- PPPoE connection info -* timeout -- how long to wait (in seconds) -*%RETURNS: -* Nothing -*%DESCRIPTION: -* Waits for a PADS packet and copies useful information -***********************************************************************/ -static void -waitForPADS(PPPoEConnection *conn, int timeout) -{ - fd_set readable; - int r; - struct timeval tv; - struct timeval expire_at; - - PPPoEPacket packet; - int len; - - if (get_time(&expire_at) < 0) { - error("get_time (waitForPADS): %m"); - return; - } - expire_at.tv_sec += timeout; - - conn->error = 0; - do { - if (BPF_BUFFER_IS_EMPTY) { - if (!time_left(&tv, &expire_at)) - return; /* Timed out */ - - FD_ZERO(&readable); - FD_SET(conn->discoverySocket, &readable); - - while(1) { - r = select(conn->discoverySocket+1, &readable, NULL, NULL, &tv); - if (r >= 0 || errno != EINTR || got_sigterm) break; - } - if (r < 0) { - error("select (waitForPADS): %m"); - return; - } - if (r == 0) - return; /* Timed out */ - } - - /* Get the packet */ - receivePacket(conn->discoverySocket, &packet, &len); - - /* Check length */ - if (ntohs(packet.length) + HDR_SIZE > len) { - error("Bogus PPPoE length field (%u)", - (unsigned int) ntohs(packet.length)); - continue; - } - -#ifdef USE_BPF - /* If it's not a Discovery packet, loop again */ - if (etherType(&packet) != Eth_PPPOE_Discovery) continue; -#endif - - /* If it's not from the AC, it's not for me */ - if (memcmp(packet.ethHdr.h_source, conn->peerEth, ETH_ALEN)) continue; - - /* If it's not for us, loop again */ - if (!packetIsForMe(conn, &packet)) continue; - - /* Is it PADS? */ - if (packet.code == CODE_PADS) { - /* Parse for goodies */ - if (parsePacket(&packet, parsePADSTags, conn) < 0) - return; - if (conn->error) - return; - conn->discoveryState = STATE_SESSION; - break; - } - } while (conn->discoveryState != STATE_SESSION); - - /* Don't bother with ntohs; we'll just end up converting it back... */ - conn->session = packet.session; - - info("PPP session is %d", (int) ntohs(conn->session)); - - /* RFC 2516 says session id MUST NOT be zero or 0xFFFF */ - if (ntohs(conn->session) == 0 || ntohs(conn->session) == 0xFFFF) { - error("Access concentrator used a session value of %x -- the AC is violating RFC 2516", (unsigned int) ntohs(conn->session)); - } -} - -/********************************************************************** -*%FUNCTION: discovery -*%ARGUMENTS: -* conn -- PPPoE connection info structure -*%RETURNS: -* Nothing -*%DESCRIPTION: -* Performs the PPPoE discovery phase -***********************************************************************/ -void -discovery(PPPoEConnection *conn) -{ - int padiAttempts = 0; - int padrAttempts = 0; - int timeout = conn->discoveryTimeout; - - do { - padiAttempts++; - if (got_sigterm || padiAttempts > conn->discoveryAttempts) { - warn("Timeout waiting for PADO packets"); - close(conn->discoverySocket); - conn->discoverySocket = -1; - return; - } - sendPADI(conn); - conn->discoveryState = STATE_SENT_PADI; - waitForPADO(conn, timeout); - - timeout *= 2; - } while (conn->discoveryState == STATE_SENT_PADI); - - timeout = conn->discoveryTimeout; - do { - padrAttempts++; - if (got_sigterm || padrAttempts > conn->discoveryAttempts) { - warn("Timeout waiting for PADS packets"); - close(conn->discoverySocket); - conn->discoverySocket = -1; - return; - } - sendPADR(conn); - conn->discoveryState = STATE_SENT_PADR; - waitForPADS(conn, timeout); - timeout *= 2; - } while (conn->discoveryState == STATE_SENT_PADR); - - if (!conn->seenMaxPayload) { - /* RFC 4638: MUST limit MTU/MRU to 1492 */ - if (lcp_allowoptions[0].mru > ETH_PPPOE_MTU) - lcp_allowoptions[0].mru = ETH_PPPOE_MTU; - if (lcp_wantoptions[0].mru > ETH_PPPOE_MTU) - lcp_wantoptions[0].mru = ETH_PPPOE_MTU; - } - - /* We're done. */ - close(conn->discoverySocket); - conn->discoverySocket = -1; - conn->discoveryState = STATE_SESSION; - return; -}