ppp.c
上传用户:yyhongfa
上传日期:2013-01-18
资源大小:267k
文件大小:48k
- /*****************************************************************************
- * ppp.c - Network Point to Point Protocol program file.
- *
- * Copyright (c) 2003 by Marc Boucher, Services Informatiques (MBSI) inc.
- * portions Copyright (c) 1997 by Global Election Systems Inc.
- *
- * The authors hereby grant permission to use, copy, modify, distribute,
- * and license this software and its documentation for any purpose, provided
- * that existing copyright notices are retained in all copies and that this
- * notice and the following disclaimer are included verbatim in any
- * distributions. No written agreement, license, or royalty fee is required
- * for any of the authorized uses.
- *
- * THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTORS *AS IS* AND ANY EXPRESS OR
- * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
- * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
- * IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
- * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
- * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
- * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- *
- ******************************************************************************
- * REVISION HISTORY
- *
- * 03-01-01 Marc Boucher <marc@mbsi.ca>
- * Ported to lwIP.
- * 97-11-05 Guy Lancaster <lancasterg@acm.org>, Global Election Systems Inc.
- * Original.
- *****************************************************************************/
- /*
- * ppp_defs.h - PPP definitions.
- *
- * if_pppvar.h - private structures and declarations for PPP.
- *
- * Copyright (c) 1994 The Australian National University.
- * All rights reserved.
- *
- * Permission to use, copy, modify, and distribute this software and its
- * documentation is hereby granted, provided that the above copyright
- * notice appears in all copies. This software is provided without any
- * warranty, express or implied. The Australian National University
- * makes no representations about the suitability of this software for
- * any purpose.
- *
- * IN NO EVENT SHALL THE AUSTRALIAN NATIONAL UNIVERSITY BE LIABLE TO ANY
- * PARTY FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
- * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF
- * THE AUSTRALIAN NATIONAL UNIVERSITY HAVE BEEN ADVISED OF THE POSSIBILITY
- * OF SUCH DAMAGE.
- *
- * THE AUSTRALIAN NATIONAL UNIVERSITY SPECIFICALLY DISCLAIMS ANY WARRANTIES,
- * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
- * AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
- * ON AN "AS IS" BASIS, AND THE AUSTRALIAN NATIONAL UNIVERSITY HAS NO
- * OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS,
- * OR MODIFICATIONS.
- */
- /*
- * if_ppp.h - Point-to-Point Protocol definitions.
- *
- * Copyright (c) 1989 Carnegie Mellon University.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms are permitted
- * provided that the above copyright notice and this paragraph are
- * duplicated in all such forms and that any documentation,
- * advertising materials, and other materials related to such
- * distribution and use acknowledge that the software was developed
- * by Carnegie Mellon University. The name of the
- * University may not be used to endorse or promote products derived
- * from this software without specific prior written permission.
- * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
- * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
- * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
- */
-
- #include <string.h>
-
- #include "ppp.h"
- #if PPP_SUPPORT > 0
- #include "randm.h"
- #include "fsm.h"
- #if PAP_SUPPORT > 0
- #include "pap.h"
- #endif
- #if CHAP_SUPPORT > 0
- #include "chap.h"
- #endif
- #include "ipcp.h"
- #include "lcp.h"
- #include "magic.h"
- #include "auth.h"
- #if VJ_SUPPORT > 0
- #include "vj.h"
- #endif
- #include "pppdebug.h"
- /*************************/
- /*** LOCAL DEFINITIONS ***/
- /*************************/
- /*
- * The basic PPP frame.
- */
- #define PPP_ADDRESS(p) (((u_char *)(p))[0])
- #define PPP_CONTROL(p) (((u_char *)(p))[1])
- #define PPP_PROTOCOL(p) ((((u_char *)(p))[2] << 8) + ((u_char *)(p))[3])
- /* PPP packet parser states. Current state indicates operation yet to be
- * completed. */
- typedef enum {
- PDIDLE = 0, /* Idle state - waiting. */
- PDSTART, /* Process start flag. */
- PDADDRESS, /* Process address field. */
- PDCONTROL, /* Process control field. */
- PDPROTOCOL1, /* Process protocol field 1. */
- PDPROTOCOL2, /* Process protocol field 2. */
- PDDATA /* Process data byte. */
- } PPPDevStates;
- #define ESCAPE_P(accm, c) ((accm)[(c) >> 3] & pppACCMMask[c & 0x07])
- /************************/
- /*** LOCAL DATA TYPES ***/
- /************************/
- /*
- * PPP interface control block.
- */
- typedef struct PPPControl_s {
- char openFlag; /* True when in use. */
- char oldFrame; /* Old framing character for fd. */
- sio_fd_t fd; /* File device ID of port. */
- int kill_link; /* Shut the link down. */
- int sig_hup; /* Carrier lost. */
- int if_up; /* True when the interface is up. */
- int errCode; /* Code indicating why interface is down. */
- struct pbuf *inHead, *inTail; /* The input packet. */
- PPPDevStates inState; /* The input process state. */
- char inEscaped; /* Escape next character. */
- u16_t inProtocol; /* The input protocol code. */
- u16_t inFCS; /* Input Frame Check Sequence value. */
- int mtu; /* Peer's mru */
- int pcomp; /* Does peer accept protocol compression? */
- int accomp; /* Does peer accept addr/ctl compression? */
- u_long lastXMit; /* Time of last transmission. */
- ext_accm inACCM; /* Async-Ctl-Char-Map for input. */
- ext_accm outACCM; /* Async-Ctl-Char-Map for output. */
- #if VJ_SUPPORT > 0
- int vjEnabled; /* Flag indicating VJ compression enabled. */
- struct vjcompress vjComp; /* Van Jabobsen compression header. */
- #endif
- struct netif netif;
- struct ppp_addrs addrs;
- void (*linkStatusCB)(void *ctx, int errCode, void *arg);
- void *linkStatusCtx;
- } PPPControl;
- /*
- * Ioctl definitions.
- */
- struct npioctl {
- int protocol; /* PPP procotol, e.g. PPP_IP */
- enum NPmode mode;
- };
- /***********************************/
- /*** LOCAL FUNCTION DECLARATIONS ***/
- /***********************************/
- static void pppMain(void *pd);
- static void pppDrop(PPPControl *pc);
- void pppInProc(int pd, u_char *s, int l);
- extern err_t ip_input(struct pbuf *p, struct netif *inp);
- /******************************/
- /*** PUBLIC DATA STRUCTURES ***/
- /******************************/
- u_long subnetMask;
- static PPPControl pppControl[NUM_PPP]; /* The PPP interface control blocks. */
- /*
- * PPP Data Link Layer "protocol" table.
- * One entry per supported protocol.
- * The last entry must be NULL.
- */
- struct protent *ppp_protocols[] = {
- &lcp_protent,
- #if PAP_SUPPORT > 0
- &pap_protent,
- #endif
- #if CHAP_SUPPORT > 0
- &chap_protent,
- #endif
- #if CBCP_SUPPORT > 0
- &cbcp_protent,
- #endif
- &ipcp_protent,
- #if CCP_SUPPORT > 0
- &ccp_protent,
- #endif
- NULL
- };
- /*
- * Buffers for outgoing packets. This must be accessed only from the appropriate
- * PPP task so that it doesn't need to be protected to avoid collisions.
- */
- u_char outpacket_buf[NUM_PPP][PPP_MRU+PPP_HDRLEN];
- /*****************************/
- /*** LOCAL DATA STRUCTURES ***/
- /*****************************/
- /*
- * FCS lookup table as calculated by genfcstab.
- */
- static const u_short fcstab[256] = {
- 0x0000, 0x1189, 0x2312, 0x329b, 0x4624, 0x57ad, 0x6536, 0x74bf,
- 0x8c48, 0x9dc1, 0xaf5a, 0xbed3, 0xca6c, 0xdbe5, 0xe97e, 0xf8f7,
- 0x1081, 0x0108, 0x3393, 0x221a, 0x56a5, 0x472c, 0x75b7, 0x643e,
- 0x9cc9, 0x8d40, 0xbfdb, 0xae52, 0xdaed, 0xcb64, 0xf9ff, 0xe876,
- 0x2102, 0x308b, 0x0210, 0x1399, 0x6726, 0x76af, 0x4434, 0x55bd,
- 0xad4a, 0xbcc3, 0x8e58, 0x9fd1, 0xeb6e, 0xfae7, 0xc87c, 0xd9f5,
- 0x3183, 0x200a, 0x1291, 0x0318, 0x77a7, 0x662e, 0x54b5, 0x453c,
- 0xbdcb, 0xac42, 0x9ed9, 0x8f50, 0xfbef, 0xea66, 0xd8fd, 0xc974,
- 0x4204, 0x538d, 0x6116, 0x709f, 0x0420, 0x15a9, 0x2732, 0x36bb,
- 0xce4c, 0xdfc5, 0xed5e, 0xfcd7, 0x8868, 0x99e1, 0xab7a, 0xbaf3,
- 0x5285, 0x430c, 0x7197, 0x601e, 0x14a1, 0x0528, 0x37b3, 0x263a,
- 0xdecd, 0xcf44, 0xfddf, 0xec56, 0x98e9, 0x8960, 0xbbfb, 0xaa72,
- 0x6306, 0x728f, 0x4014, 0x519d, 0x2522, 0x34ab, 0x0630, 0x17b9,
- 0xef4e, 0xfec7, 0xcc5c, 0xddd5, 0xa96a, 0xb8e3, 0x8a78, 0x9bf1,
- 0x7387, 0x620e, 0x5095, 0x411c, 0x35a3, 0x242a, 0x16b1, 0x0738,
- 0xffcf, 0xee46, 0xdcdd, 0xcd54, 0xb9eb, 0xa862, 0x9af9, 0x8b70,
- 0x8408, 0x9581, 0xa71a, 0xb693, 0xc22c, 0xd3a5, 0xe13e, 0xf0b7,
- 0x0840, 0x19c9, 0x2b52, 0x3adb, 0x4e64, 0x5fed, 0x6d76, 0x7cff,
- 0x9489, 0x8500, 0xb79b, 0xa612, 0xd2ad, 0xc324, 0xf1bf, 0xe036,
- 0x18c1, 0x0948, 0x3bd3, 0x2a5a, 0x5ee5, 0x4f6c, 0x7df7, 0x6c7e,
- 0xa50a, 0xb483, 0x8618, 0x9791, 0xe32e, 0xf2a7, 0xc03c, 0xd1b5,
- 0x2942, 0x38cb, 0x0a50, 0x1bd9, 0x6f66, 0x7eef, 0x4c74, 0x5dfd,
- 0xb58b, 0xa402, 0x9699, 0x8710, 0xf3af, 0xe226, 0xd0bd, 0xc134,
- 0x39c3, 0x284a, 0x1ad1, 0x0b58, 0x7fe7, 0x6e6e, 0x5cf5, 0x4d7c,
- 0xc60c, 0xd785, 0xe51e, 0xf497, 0x8028, 0x91a1, 0xa33a, 0xb2b3,
- 0x4a44, 0x5bcd, 0x6956, 0x78df, 0x0c60, 0x1de9, 0x2f72, 0x3efb,
- 0xd68d, 0xc704, 0xf59f, 0xe416, 0x90a9, 0x8120, 0xb3bb, 0xa232,
- 0x5ac5, 0x4b4c, 0x79d7, 0x685e, 0x1ce1, 0x0d68, 0x3ff3, 0x2e7a,
- 0xe70e, 0xf687, 0xc41c, 0xd595, 0xa12a, 0xb0a3, 0x8238, 0x93b1,
- 0x6b46, 0x7acf, 0x4854, 0x59dd, 0x2d62, 0x3ceb, 0x0e70, 0x1ff9,
- 0xf78f, 0xe606, 0xd49d, 0xc514, 0xb1ab, 0xa022, 0x92b9, 0x8330,
- 0x7bc7, 0x6a4e, 0x58d5, 0x495c, 0x3de3, 0x2c6a, 0x1ef1, 0x0f78
- };
- /* PPP's Asynchronous-Control-Character-Map. The mask array is used
- * to select the specific bit for a character. */
- static u_char pppACCMMask[] = {
- 0x01,
- 0x02,
- 0x04,
- 0x08,
- 0x10,
- 0x20,
- 0x40,
- 0x80
- };
- /***********************************/
- /*** PUBLIC FUNCTION DEFINITIONS ***/
- /***********************************/
- /* Initialize the PPP subsystem. */
- struct ppp_settings ppp_settings;
- void pppInit(void)
- {
- struct protent *protp;
- int i, j;
-
- memset(&ppp_settings, 0, sizeof(ppp_settings));
- ppp_settings.usepeerdns = 1;
-
- /*
- *skier:Parameters should be changed
- *modified by skier 2006.01.30
- *because we could supprot both CHAP & PAP
- */
- //pppSetAuth(PPPAUTHTYPE_NONE, NULL, NULL);
- if (CHAP_SUPPORT && PAP_SUPPORT)
- {
- pppSetAuth(PPPAUTHTYPE_ANY, USER, PASSWORD);
- }
- else
- {
- pppSetAuth(PPPAUTHTYPE_NONE, NULL, NULL);
- }
- /*skier:end 2006.01.30*/
-
- magicInit();
- for (i = 0; i < NUM_PPP; i++) {
- pppControl[i].openFlag = 0;
- subnetMask = htonl(0xffffff00);
-
- /*
- * Initialize to the standard option set.
- */
- for (j = 0; (protp = ppp_protocols[j]) != NULL; ++j)
- (*protp->init)(i);
- }
- #if LINK_STATS
- /* Clear the statistics. */
- memset(&lwip_stats.link, 0, sizeof(lwip_stats.link));
- #endif
- }
- void pppSetAuth(enum pppAuthType authType, const char *user, const char *passwd)
- {
- switch(authType) {
- case PPPAUTHTYPE_NONE:
- default:
- #ifdef LWIP_PPP_STRICT_PAP_REJECT
- ppp_settings.refuse_pap = 1;
- #else
- /* some providers request pap and accept an empty login/pw */
- ppp_settings.refuse_pap = 0;
- #endif
- ppp_settings.refuse_chap = 1;
- break;
- case PPPAUTHTYPE_ANY:
- /* Warning: Using PPPAUTHTYPE_ANY might have security consequences.
- * RFC 1994 says:
- *
- * In practice, within or associated with each PPP server, there is a
- * database which associates "user" names with authentication
- * information ("secrets"). It is not anticipated that a particular
- * named user would be authenticated by multiple methods. This would
- * make the user vulnerable to attacks which negotiate the least secure
- * method from among a set (such as PAP rather than CHAP). If the same
- * secret was used, PAP would reveal the secret to be used later with
- * CHAP.
- *
- * Instead, for each user name there should be an indication of exactly
- * one method used to authenticate that user name. If a user needs to
- * make use of different authentication methods under different
- * circumstances, then distinct user names SHOULD be employed, each of
- * which identifies exactly one authentication method.
- *
- */
- ppp_settings.refuse_pap = 0;
- ppp_settings.refuse_chap = 0;
- break;
- case PPPAUTHTYPE_PAP:
- ppp_settings.refuse_pap = 0;
- ppp_settings.refuse_chap = 1;
- break;
- case PPPAUTHTYPE_CHAP:
- ppp_settings.refuse_pap = 1;
- ppp_settings.refuse_chap = 0;
- break;
- }
- if(user) {
- strncpy(ppp_settings.user, user, sizeof(ppp_settings.user)-1);
- ppp_settings.user[sizeof(ppp_settings.user)-1] = ' ';
- } else
- ppp_settings.user[0] = ' ';
- if(passwd) {
- strncpy(ppp_settings.passwd, passwd, sizeof(ppp_settings.passwd)-1);
- ppp_settings.passwd[sizeof(ppp_settings.passwd)-1] = ' ';
- } else
- ppp_settings.passwd[0] = ' ';
- }
- /* Open a new PPP connection using the given I/O device.
- * This initializes the PPP control block but does not
- * attempt to negotiate the LCP session. If this port
- * connects to a modem, the modem connection must be
- * established before calling this.
- * Return a new PPP connection descriptor on success or
- * an error code (negative) on failure. */
- int pppOpen(sio_fd_t fd, void (*linkStatusCB)(void *ctx, int errCode, void *arg), void *linkStatusCtx)
- {
- PPPControl *pc;
- int pd;
- /* Find a free PPP session descriptor. Critical region? */
- for (pd = 0; pd < NUM_PPP && pppControl[pd].openFlag != 0; pd++);
- if (pd >= NUM_PPP)
- pd = PPPERR_OPEN;
- else
- pppControl[pd].openFlag = !0;
- /* Launch a deamon thread. */
- if (pd >= 0) {
- pppControl[pd].openFlag = 1;
- lcp_init(pd);
- pc = &pppControl[pd];
- pc->fd = fd;
- pc->kill_link = 0;
- pc->sig_hup = 0;
- pc->if_up = 0;
- pc->errCode = 0;
- pc->inState = PDIDLE;
- pc->inHead = NULL;
- pc->inTail = NULL;
- pc->inEscaped = 0;
- pc->lastXMit = 0;
- #if VJ_SUPPORT > 0
- pc->vjEnabled = 0;
- vj_compress_init(&pc->vjComp);
- #endif
- /*
- * Default the in and out accm so that escape and flag characters
- * are always escaped.
- */
- memset(pc->inACCM, 0, sizeof(ext_accm));
- pc->inACCM[15] = 0x60;
- memset(pc->outACCM, 0, sizeof(ext_accm));
- pc->outACCM[15] = 0x60;
- pc->linkStatusCB = linkStatusCB;
- pc->linkStatusCtx = linkStatusCtx;
-
- /*Modified by zhouzhigang 2005.01.16 for single thread, start LCP*/
- //sys_thread_new(pppMain, (void*)pd, PPP_THREAD_PRIO);
- pppStartCB((void*)pd);
-
- /*Delete by zhouzhigang 2005.01.16 for not useful*/
- /*if(!linkStatusCB) {
- while(pd >= 0 && !pc->if_up) {
- sys_msleep(500);
- if (lcp_phase[pd] == PHASE_DEAD) {
- pppClose(pd);
- if (pc->errCode)
- pd = pc->errCode;
- else
- pd = PPPERR_CONNECT;
- }
- }
- }*/
- }
- return pd;
- }
- /* Close a PPP connection and release the descriptor.
- * Any outstanding packets in the queues are dropped.
- * Return 0 on success, an error code on failure. */
- int pppClose(int pd)
- {
- PPPControl *pc = &pppControl[pd];
- int st = 0;
- /* Disconnect */
- pc->kill_link = !0;
- pppMainWakeup(pd);
-
- if(!pc->linkStatusCB) {
- while(st >= 0 && lcp_phase[pd] != PHASE_DEAD) {
- // sys_msleep(500);
- break;
- }
- }
- return st;
- }
- /* This function is called when carrier is lost on the PPP channel. */
- void pppSigHUP(int pd)
- {
- PPPControl *pc = &pppControl[pd];
- pc->sig_hup = 1;
- pppMainWakeup(pd);
- }
- static void nPut(PPPControl *pc, struct pbuf *nb)
- {
- struct pbuf *b;
- int c;
-
- DEBUG_EVENT(" Send some data to Modem:");
-
- for(b = nb; b != NULL; b = b->next) {
- if((c = sio_write(pc->fd, b->payload, b->len)) != b->len) {
- PPPDEBUG((LOG_WARNING,
- "PPP nPut: incomplete sio_write(%d,, %u) = %dn", pc->fd, b->len, c));
- #if LINK_STATS
- lwip_stats.link.err++;
- #endif /* LINK_STATS */
- pc->lastXMit = 0; /* prepend PPP_FLAG to next packet */
- break;
- }
- }
- pbuf_free(nb);
- #if LINK_STATS
- lwip_stats.link.xmit++;
- #endif /* LINK_STATS */
- }
- /*
- * pppAppend - append given character to end of given pbuf. If outACCM
- * is not NULL and the character needs to be escaped, do so.
- * If pbuf is full, append another.
- * Return the current pbuf.
- */
- static struct pbuf *pppAppend(u_char c, struct pbuf *nb, ext_accm *outACCM)
- {
- struct pbuf *tb = nb;
-
- /* Make sure there is room for the character and an escape code.
- * Sure we don't quite fill the buffer if the character doesn't
- * get escaped but is one character worth complicating this? */
- /* Note: We assume no packet header. */
- if (nb && (PBUF_POOL_BUFSIZE - nb->len) < 2) {
- tb = pbuf_alloc(PBUF_RAW, 0, PBUF_POOL);
- if (tb) {
- nb->next = tb;
- }
- #if LINK_STATS
- else {
- lwip_stats.link.memerr++;
- }
- #endif /* LINK_STATS */
- nb = tb;
- }
- if (nb) {
- if (outACCM && ESCAPE_P(*outACCM, c)) {
- *((u_char*)nb->payload + nb->len++) = PPP_ESCAPE;
- *((u_char*)nb->payload + nb->len++) = c ^ PPP_TRANS;
- }
- else
- *((u_char*)nb->payload + nb->len++) = c;
- }
-
- return tb;
- }
- /* Send a packet on the given connection. */
- static err_t pppifOutput(struct netif *netif, struct pbuf *pb, struct ip_addr *ipaddr)
- {
- int pd = (int)netif->state;
- u_short protocol = PPP_IP;
- PPPControl *pc = &pppControl[pd];
- u_int fcsOut = PPP_INITFCS;
- struct pbuf *headMB = NULL, *tailMB = NULL, *p;
- u_char c;
- (void)ipaddr;
- /* Validate parameters. */
- /* We let any protocol value go through - it can't hurt us
- * and the peer will just drop it if it's not accepting it. */
- if (pd < 0 || pd >= NUM_PPP || !pc->openFlag || !pb) {
- PPPDEBUG((LOG_WARNING, "pppifOutput[%d]: bad parms prot=%d pb=%pn",
- pd, protocol, pb));
- #if LINK_STATS
- lwip_stats.link.opterr++;
- lwip_stats.link.drop++;
- #endif
- return ERR_ARG;
- }
- /* Check that the link is up. */
- if (lcp_phase[pd] == PHASE_DEAD) {
- PPPDEBUG((LOG_ERR, "pppifOutput[%d]: link not upn", pd));
- #if LINK_STATS
- lwip_stats.link.rterr++;
- lwip_stats.link.drop++;
- #endif
- return ERR_RTE;
- }
- /* Grab an output buffer. */
- headMB = pbuf_alloc(PBUF_RAW, 0, PBUF_POOL);
- if (headMB == NULL) {
- PPPDEBUG((LOG_WARNING, "pppifOutput[%d]: first alloc failn", pd));
- #if LINK_STATS
- lwip_stats.link.memerr++;
- lwip_stats.link.drop++;
- #endif /* LINK_STATS */
- return ERR_MEM;
- }
-
- #if VJ_SUPPORT > 0
- /*
- * Attempt Van Jacobson header compression if VJ is configured and
- * this is an IP packet.
- */
- if (protocol == PPP_IP && pc->vjEnabled) {
- switch (vj_compress_tcp(&pc->vjComp, pb)) {
- case TYPE_IP:
- /* No change...
- protocol = PPP_IP_PROTOCOL;
- */
- break;
- case TYPE_COMPRESSED_TCP:
- protocol = PPP_VJC_COMP;
- break;
- case TYPE_UNCOMPRESSED_TCP:
- protocol = PPP_VJC_UNCOMP;
- break;
- default:
- PPPDEBUG((LOG_WARNING, "pppifOutput[%d]: bad IP packetn", pd));
- #if LINK_STATS
- lwip_stats.link.proterr++;
- lwip_stats.link.drop++;
- #endif
- pbuf_free(headMB);
- return ERR_VAL;
- }
- }
- #endif
-
- tailMB = headMB;
-
- /* Build the PPP header. */
- if ((sys_jiffies() - pc->lastXMit) >= PPP_MAXIDLEFLAG)
- tailMB = pppAppend(PPP_FLAG, tailMB, NULL);
- pc->lastXMit = sys_jiffies();
- if (!pc->accomp) {
- fcsOut = PPP_FCS(fcsOut, PPP_ALLSTATIONS);
- tailMB = pppAppend(PPP_ALLSTATIONS, tailMB, &pc->outACCM);
- fcsOut = PPP_FCS(fcsOut, PPP_UI);
- tailMB = pppAppend(PPP_UI, tailMB, &pc->outACCM);
- }
- if (!pc->pcomp || protocol > 0xFF) {
- c = (protocol >> 8) & 0xFF;
- fcsOut = PPP_FCS(fcsOut, c);
- tailMB = pppAppend(c, tailMB, &pc->outACCM);
- }
- c = protocol & 0xFF;
- fcsOut = PPP_FCS(fcsOut, c);
- tailMB = pppAppend(c, tailMB, &pc->outACCM);
-
- /* Load packet. */
- for(p = pb; p; p = p->next) {
- int n;
- u_char *sPtr;
- sPtr = (u_char*)p->payload;
- n = p->len;
- while (n-- > 0) {
- c = *sPtr++;
-
- /* Update FCS before checking for special characters. */
- fcsOut = PPP_FCS(fcsOut, c);
-
- /* Copy to output buffer escaping special characters. */
- tailMB = pppAppend(c, tailMB, &pc->outACCM);
- }
- }
- /* Add FCS and trailing flag. */
- c = ~fcsOut & 0xFF;
- tailMB = pppAppend(c, tailMB, &pc->outACCM);
- c = (~fcsOut >> 8) & 0xFF;
- tailMB = pppAppend(c, tailMB, &pc->outACCM);
- tailMB = pppAppend(PPP_FLAG, tailMB, NULL);
-
- /* If we failed to complete the packet, throw it away. */
- if (!tailMB) {
- PPPDEBUG((LOG_WARNING,
- "pppifOutput[%d]: Alloc err - dropping proto=%dn",
- pd, protocol));
- pbuf_free(headMB);
- #if LINK_STATS
- lwip_stats.link.memerr++;
- lwip_stats.link.drop++;
- #endif
- return ERR_MEM;
- }
- /* Send it. */
- PPPDEBUG((LOG_INFO, "pppifOutput[%d]: proto=0x%04Xn", pd, protocol));
- nPut(pc, headMB);
- return ERR_OK;
- }
- /* Get and set parameters for the given connection.
- * Return 0 on success, an error code on failure. */
- int pppIOCtl(int pd, int cmd, void *arg)
- {
- PPPControl *pc = &pppControl[pd];
- int st = 0;
- if (pd < 0 || pd >= NUM_PPP)
- st = PPPERR_PARAM;
- else {
- switch(cmd) {
- case PPPCTLG_UPSTATUS: /* Get the PPP up status. */
- if (arg)
- *(int *)arg = (int)(pc->if_up);
- else
- st = PPPERR_PARAM;
- break;
- case PPPCTLS_ERRCODE: /* Set the PPP error code. */
- if (arg)
- pc->errCode = *(int *)arg;
- else
- st = PPPERR_PARAM;
- break;
- case PPPCTLG_ERRCODE: /* Get the PPP error code. */
- if (arg)
- *(int *)arg = (int)(pc->errCode);
- else
- st = PPPERR_PARAM;
- break;
- case PPPCTLG_FD:
- if (arg)
- *(sio_fd_t *)arg = pc->fd;
- else
- st = PPPERR_PARAM;
- break;
- default:
- st = PPPERR_PARAM;
- break;
- }
- }
-
- return st;
- }
- /*
- * Return the Maximum Transmission Unit for the given PPP connection.
- */
- u_int pppMTU(int pd)
- {
- PPPControl *pc = &pppControl[pd];
- u_int st;
-
- /* Validate parameters. */
- if (pd < 0 || pd >= NUM_PPP || !pc->openFlag)
- st = 0;
- else
- st = pc->mtu;
-
- return st;
- }
- /*
- * Write n characters to a ppp link.
- * RETURN: >= 0 Number of characters written
- * -1 Failed to write to device
- */
- int pppWrite(int pd, const u_char *s, int n)
- {
- PPPControl *pc = &pppControl[pd];
- u_char c;
- u_int fcsOut = PPP_INITFCS;
- struct pbuf *headMB = NULL, *tailMB;
- headMB = pbuf_alloc(PBUF_RAW, 0, PBUF_POOL);
- if (headMB == NULL) {
- #if LINK_STATS
- lwip_stats.link.memerr++;
- lwip_stats.link.proterr++;
- #endif /* LINK_STATS */
- return PPPERR_ALLOC;
- }
- tailMB = headMB;
-
- /* If the link has been idle, we'll send a fresh flag character to
- * flush any noise. */
- if ((sys_jiffies() - pc->lastXMit) >= PPP_MAXIDLEFLAG)
- tailMB = pppAppend(PPP_FLAG, tailMB, NULL);
- pc->lastXMit = sys_jiffies();
-
- /* Load output buffer. */
- while (n-- > 0) {
- c = *s++;
-
- /* Update FCS before checking for special characters. */
- fcsOut = PPP_FCS(fcsOut, c);
-
- /* Copy to output buffer escaping special characters. */
- tailMB = pppAppend(c, tailMB, &pc->outACCM);
- }
-
- /* Add FCS and trailing flag. */
- c = ~fcsOut & 0xFF;
- tailMB = pppAppend(c, tailMB, &pc->outACCM);
- c = (~fcsOut >> 8) & 0xFF;
- tailMB = pppAppend(c, tailMB, &pc->outACCM);
- tailMB = pppAppend(PPP_FLAG, tailMB, NULL);
-
- /* If we failed to complete the packet, throw it away.
- * Otherwise send it. */
- if (!tailMB) {
- PPPDEBUG((LOG_WARNING,
- "pppWrite[%d]: Alloc err - dropping pbuf len=%dn", pd, headMB->len));
- /* "pppWrite[%d]: Alloc err - dropping %d:%.*H", pd, headMB->len, LWIP_MIN(headMB->len * 2, 40), headMB->payload)); */
- pbuf_free(headMB);
- #if LINK_STATS
- lwip_stats.link.memerr++;
- lwip_stats.link.proterr++;
- #endif /* LINK_STATS */
- return PPPERR_ALLOC;
- }
- PPPDEBUG((LOG_INFO, "pppWrite[%d]: len=%dn", pd, headMB->len));
- /* "pppWrite[%d]: %d:%.*H", pd, headMB->len, LWIP_MIN(headMB->len * 2, 40), headMB->payload)); */
- nPut(pc, headMB);
- return PPPERR_NONE;
- }
- /*
- * ppp_send_config - configure the transmit characteristics of
- * the ppp interface.
- */
- void ppp_send_config(
- int unit,
- int mtu,
- u32_t asyncmap,
- int pcomp,
- int accomp
- )
- {
- PPPControl *pc = &pppControl[unit];
- int i;
-
- pc->mtu = mtu;
- pc->pcomp = pcomp;
- pc->accomp = accomp;
-
- /* Load the ACCM bits for the 32 control codes. */
- for (i = 0; i < 32/8; i++)
- pc->outACCM[i] = (u_char)((asyncmap >> (8 * i)) & 0xFF);
- PPPDEBUG((LOG_INFO, "ppp_send_config[%d]: outACCM=%X %X %X %Xn",
- unit,
- pc->outACCM[0], pc->outACCM[1], pc->outACCM[2], pc->outACCM[3]));
- }
- /*
- * ppp_set_xaccm - set the extended transmit ACCM for the interface.
- */
- void ppp_set_xaccm(int unit, ext_accm *accm)
- {
- memcpy(pppControl[unit].outACCM, accm, sizeof(ext_accm));
- PPPDEBUG((LOG_INFO, "ppp_set_xaccm[%d]: outACCM=%X %X %X %Xn",
- unit,
- pppControl[unit].outACCM[0],
- pppControl[unit].outACCM[1],
- pppControl[unit].outACCM[2],
- pppControl[unit].outACCM[3]));
- }
- /*
- * ppp_recv_config - configure the receive-side characteristics of
- * the ppp interface.
- */
- void ppp_recv_config(
- int unit,
- int mru,
- u32_t asyncmap,
- int pcomp,
- int accomp
- )
- {
- PPPControl *pc = &pppControl[unit];
- int i;
-
- (void)accomp;
- (void)pcomp;
- (void)mru;
- /* Load the ACCM bits for the 32 control codes. */
- for (i = 0; i < 32 / 8; i++)
- pc->inACCM[i] = (u_char)(asyncmap >> (i * 8));
- PPPDEBUG((LOG_INFO, "ppp_recv_config[%d]: inACCM=%X %X %X %Xn",
- unit,
- pc->inACCM[0], pc->inACCM[1], pc->inACCM[2], pc->inACCM[3]));
- }
- #if 0
- /*
- * ccp_test - ask kernel whether a given compression method
- * is acceptable for use. Returns 1 if the method and parameters
- * are OK, 0 if the method is known but the parameters are not OK
- * (e.g. code size should be reduced), or -1 if the method is unknown.
- */
- int ccp_test(
- int unit,
- int opt_len,
- int for_transmit,
- u_char *opt_ptr
- )
- {
- return 0; /* XXX Currently no compression. */
- }
- /*
- * ccp_flags_set - inform kernel about the current state of CCP.
- */
- void ccp_flags_set(int unit, int isopen, int isup)
- {
- /* XXX */
- }
- /*
- * ccp_fatal_error - returns 1 if decompression was disabled as a
- * result of an error detected after decompression of a packet,
- * 0 otherwise. This is necessary because of patent nonsense.
- */
- int ccp_fatal_error(int unit)
- {
- /* XXX */
- return 0;
- }
- #endif
- /*
- * get_idle_time - return how long the link has been idle.
- */
- int get_idle_time(int u, struct ppp_idle *ip)
- {
- /* XXX */
- (void)u;
- (void)ip;
- return 0;
- }
- /*
- * Return user specified netmask, modified by any mask we might determine
- * for address `addr' (in network byte order).
- * Here we scan through the system's list of interfaces, looking for
- * any non-point-to-point interfaces which might appear to be on the same
- * network as `addr'. If we find any, we OR in their netmask to the
- * user-specified netmask.
- */
- u32_t GetMask(u32_t addr)
- {
- u32_t mask, nmask;
-
- htonl(addr);
- if (IN_CLASSA(addr)) /* determine network mask for address class */
- nmask = IN_CLASSA_NET;
- else if (IN_CLASSB(addr))
- nmask = IN_CLASSB_NET;
- else
- nmask = IN_CLASSC_NET;
- /* class D nets are disallowed by bad_ip_adrs */
- mask = subnetMask | htonl(nmask);
-
- /* XXX
- * Scan through the system's network interfaces.
- * Get each netmask and OR them into our mask.
- */
-
- return mask;
- }
- /*
- * sifvjcomp - config tcp header compression
- */
- int sifvjcomp(
- int pd,
- int vjcomp,
- int cidcomp,
- int maxcid
- )
- {
- #if VJ_SUPPORT > 0
- PPPControl *pc = &pppControl[pd];
-
- pc->vjEnabled = vjcomp;
- pc->vjComp.compressSlot = cidcomp;
- pc->vjComp.maxSlotIndex = maxcid;
- PPPDEBUG((LOG_INFO, "sifvjcomp: VJ compress enable=%d slot=%d max slot=%dn",
- vjcomp, cidcomp, maxcid));
- #endif
- return 0;
- }
- /*
- * pppifNetifInit - netif init callback
- */
- static err_t pppifNetifInit(struct netif *netif)
- {
- netif->name[0] = 'p';
- netif->name[1] = 'p';
- netif->output = pppifOutput;
- netif->mtu = pppMTU((int)netif->state);
- return ERR_OK;
- }
- /*
- * sifup - Config the interface up and enable IP packets to pass.
- */
- int sifup(int pd)
- {
- PPPControl *pc = &pppControl[pd];
- int st = 1;
-
- if (pd < 0 || pd >= NUM_PPP || !pc->openFlag) {
- st = 0;
- PPPDEBUG((LOG_WARNING, "sifup[%d]: bad parmsn", pd));
- } else {
- netif_remove(&pc->netif);
- if (netif_add(&pc->netif, &pc->addrs.our_ipaddr, &pc->addrs.netmask, &pc->addrs.his_ipaddr, (void *)pd, pppifNetifInit, ip_input)) {
- pc->if_up = 1;
- pc->errCode = PPPERR_NONE;
- /*
- *new added by skier 2006.01.30
- */
- pc->netif.flags = NETIF_FLAG_UP;
- /*skier:end 2006.01.30*/
- PPPDEBUG((LOG_DEBUG, "sifup: unit %d: linkStatusCB=%lx errCode=%dn", pd, pc->linkStatusCB, pc->errCode));
- if(pc->linkStatusCB)
- pc->linkStatusCB(pc->linkStatusCtx, pc->errCode, &pc->addrs);
- } else {
- st = 0;
- PPPDEBUG((LOG_ERR, "sifup[%d]: netif_add failedn", pd));
- }
- }
- return st;
- }
- /*
- * sifnpmode - Set the mode for handling packets for a given NP.
- */
- int sifnpmode(int u, int proto, enum NPmode mode)
- {
- (void)u;
- (void)proto;
- (void)mode;
- return 0;
- }
- /*
- * sifdown - Config the interface down and disable IP.
- */
- int sifdown(int pd)
- {
- PPPControl *pc = &pppControl[pd];
- int st = 1;
-
- if (pd < 0 || pd >= NUM_PPP || !pc->openFlag) {
- st = 0;
- PPPDEBUG((LOG_WARNING, "sifdown[%d]: bad parmsn", pd));
- } else {
- pc->if_up = 0;
- netif_remove(&pc->netif);
- PPPDEBUG((LOG_DEBUG, "sifdown: unit %d: linkStatusCB=%lx errCode=%dn", pd, pc->linkStatusCB, pc->errCode));
- if(pc->linkStatusCB)
- pc->linkStatusCB(pc->linkStatusCtx, PPPERR_CONNECT, NULL);
- }
- return st;
- }
- /*
- * sifaddr - Config the interface IP addresses and netmask.
- */
- int sifaddr(
- int pd, /* Interface unit ??? */
- u32_t o, /* Our IP address ??? */
- u32_t h, /* His IP address ??? */
- u32_t m, /* IP subnet mask ??? */
- u32_t ns1, /* Primary DNS */
- u32_t ns2 /* Secondary DNS */
- )
- {
- PPPControl *pc = &pppControl[pd];
- int st = 1;
-
- if (pd < 0 || pd >= NUM_PPP || !pc->openFlag) {
- st = 0;
- PPPDEBUG((LOG_WARNING, "sifup[%d]: bad parmsn", pd));
- } else {
- memcpy(&pc->addrs.our_ipaddr, &o, sizeof(o));
- memcpy(&pc->addrs.his_ipaddr, &h, sizeof(h));
- memcpy(&pc->addrs.netmask, &m, sizeof(m));
- memcpy(&pc->addrs.dns1, &ns1, sizeof(ns1));
- memcpy(&pc->addrs.dns2, &ns2, sizeof(ns2));
- }
- return st;
- }
- /*
- * cifaddr - Clear the interface IP addresses, and delete routes
- * through the interface if possible.
- */
- int cifaddr(
- int pd, /* Interface unit ??? */
- u32_t o, /* Our IP address ??? */
- u32_t h /* IP broadcast address ??? */
- )
- {
- PPPControl *pc = &pppControl[pd];
- int st = 1;
-
- (void)o;
- (void)h;
- if (pd < 0 || pd >= NUM_PPP || !pc->openFlag) {
- st = 0;
- PPPDEBUG((LOG_WARNING, "sifup[%d]: bad parmsn", pd));
- } else {
- IP4_ADDR(&pc->addrs.our_ipaddr, 0,0,0,0);
- IP4_ADDR(&pc->addrs.his_ipaddr, 0,0,0,0);
- IP4_ADDR(&pc->addrs.netmask, 255,255,255,0);
- IP4_ADDR(&pc->addrs.dns1, 0,0,0,0);
- IP4_ADDR(&pc->addrs.dns2, 0,0,0,0);
- }
- return st;
- }
- /*
- * sifdefaultroute - assign a default route through the address given.
- */
- int sifdefaultroute(int pd, u32_t l, u32_t g)
- {
- PPPControl *pc = &pppControl[pd];
- int st = 1;
-
- (void)l;
- (void)g;
- if (pd < 0 || pd >= NUM_PPP || !pc->openFlag) {
- st = 0;
- PPPDEBUG((LOG_WARNING, "sifup[%d]: bad parmsn", pd));
- } else {
- netif_set_default(&pc->netif);
- }
- /* TODO: check how PPP handled the netMask, previously not set by ipSetDefault */
- return st;
- }
- /*
- * cifdefaultroute - delete a default route through the address given.
- */
- int cifdefaultroute(int pd, u32_t l, u32_t g)
- {
- PPPControl *pc = &pppControl[pd];
- int st = 1;
-
- (void)l;
- (void)g;
- if (pd < 0 || pd >= NUM_PPP || !pc->openFlag) {
- st = 0;
- PPPDEBUG((LOG_WARNING, "sifup[%d]: bad parmsn", pd));
- } else {
- netif_set_default(NULL);
- }
- return st;
- }
- void
- pppMainWakeup(int pd)
- {
- PPPDEBUG((LOG_DEBUG, "pppMainWakeup: unit %dn", pd));
- sio_read_abort(pppControl[pd].fd);
- }
- /* these callbacks are necessary because lcp_* functions
- must be called in the same context as pppInput(),
- namely the tcpip_thread(), essentially because
- they manipulate timeouts which are thread-private
- */
- static void
- pppStartCB(void *arg)
- {
- int pd = (int)arg;
- PPPDEBUG((LOG_DEBUG, "pppStartCB: unit %dn", pd));
- lcp_lowerup(pd);
- lcp_open(pd); /* Start protocol */
- }
- static void
- pppStopCB(void *arg)
- {
- int pd = (int)arg;
- PPPDEBUG((LOG_DEBUG, "pppStopCB: unit %dn", pd));
- lcp_close(pd, "User request");
- }
- static void
- pppHupCB(void *arg)
- {
- int pd = (int)arg;
- PPPDEBUG((LOG_DEBUG, "pppHupCB: unit %dn", pd));
- lcp_lowerdown(pd);
- link_terminated(pd);
- }
- /**********************************/
- /*** LOCAL FUNCTION DEFINITIONS ***/
- /**********************************/
- /* The main PPP process function. This implements the state machine according
- * to section 4 of RFC 1661: The Point-To-Point Protocol. */
- #if 0
- static void pppMain(void *arg)
- {
- int pd = (int)arg;
- struct pbuf *p;
- PPPControl* pc;
- pc = &pppControl[pd];
- p = pbuf_alloc(PBUF_RAW, PPP_MRU+PPP_HDRLEN, PBUF_RAM);
- if(!p) {
- LWIP_ASSERT("p != NULL", p);
- pc->errCode = PPPERR_ALLOC;
- goto out;
- }
- /*
- * Start the connection and handle incoming events (packet or timeout).
- */
- PPPDEBUG((LOG_INFO, "pppMain: unit %d: Connectingn", pd));
- tcpip_callback(pppStartCB, arg);
- while (lcp_phase[pd] != PHASE_DEAD) {
- if (pc->kill_link) {
- PPPDEBUG((LOG_DEBUG, "pppMainWakeup: unit %d kill_link -> pppStopCBn", pd));
- pc->errCode = PPPERR_USER;
- /* This will leave us at PHASE_DEAD. */
- tcpip_callback(pppStopCB, arg);
- pc->kill_link = 0;
- }
- else if (pc->sig_hup) {
- PPPDEBUG((LOG_DEBUG, "pppMainWakeup: unit %d sig_hup -> pppHupCBn", pd));
- pc->sig_hup = 0;
- tcpip_callback(pppHupCB, arg);
- } else {
- //delete by zhouzhigang 2006.01.20 for compile
- #if 0
- int c = sio_read(pc->fd, p->payload, p->len);
- if(c > 0) {
- pppInProc(pd, p->payload, c);
- } else {
- // PPPDEBUG((LOG_DEBUG, "pppMainWakeup: unit %d sio_read len=%d returned %dn", pd, p->len, c));
- sys_msleep(1); /* give other tasks a chance to run */
- }
- #endif
- }
- }
- PPPDEBUG((LOG_INFO, "pppMain: unit %d: PHASE_DEADn", pd));
- pbuf_free(p);
- out:
- PPPDEBUG((LOG_DEBUG, "pppMain: unit %d: linkStatusCB=%lx errCode=%dn", pd, pc->linkStatusCB, pc->errCode));
- if(pc->linkStatusCB)
- pc->linkStatusCB(pc->linkStatusCtx, pc->errCode ? pc->errCode : PPPERR_PROTOCOL, NULL);
- pc->openFlag = 0;
- }
- #endif
- static struct pbuf *pppSingleBuf(struct pbuf *p)
- {
- struct pbuf *q, *b;
- u_char *pl;
- if(p->tot_len == p->len)
- return p;
- q = pbuf_alloc(PBUF_RAW, p->tot_len, PBUF_RAM);
- if(!q) {
- PPPDEBUG((LOG_ERR,
- "pppSingleBuf: unable to alloc new buf (%d)n", p->tot_len));
- return p; /* live dangerously */
- }
- for(b = p, pl = q->payload; b != NULL; b = b->next) {
- memcpy(pl, b->payload, b->len);
- pl += b->len;
- }
- pbuf_free(p);
- return q;
- }
- struct pppInputHeader {
- int unit;
- u16_t proto;
- };
- /*
- * Pass the processed input packet to the appropriate handler.
- * This function and all handlers run in the context of the tcpip_thread
- */
- static void pppInput(void *arg)
- {
- struct pbuf *nb = (struct pbuf *)arg;
- u16_t protocol;
- int pd;
- pd = ((struct pppInputHeader *)nb->payload)->unit;
- protocol = ((struct pppInputHeader *)nb->payload)->proto;
- pbuf_header(nb, -(int)sizeof(struct pppInputHeader));
- #if LINK_STATS
- lwip_stats.link.recv++;
- #endif /* LINK_STATS */
- /*
- * Toss all non-LCP packets unless LCP is OPEN.
- * Until we get past the authentication phase, toss all packets
- * except LCP, LQR and authentication packets.
- */
- if((lcp_phase[pd] <= PHASE_AUTHENTICATE) && (protocol != PPP_LCP)) {
- if(!((protocol == PPP_LQR) || (protocol == PPP_PAP) || (protocol == PPP_CHAP)) ||
- (lcp_phase[pd] != PHASE_AUTHENTICATE)) {
- PPPDEBUG((LOG_INFO, "pppInput: discarding proto 0x%04X in phase %dn", protocol, lcp_phase[pd]));
- goto drop;
- }
- }
- switch(protocol) {
- case PPP_VJC_COMP: /* VJ compressed TCP */
- #if VJ_SUPPORT > 0
- PPPDEBUG((LOG_INFO, "pppInput[%d]: vj_comp in pbuf len=%dn", pd, nb->len));
- /*
- * Clip off the VJ header and prepend the rebuilt TCP/IP header and
- * pass the result to IP.
- */
- if (vj_uncompress_tcp(&nb, &pppControl[pd].vjComp) >= 0) {
- pppControl[pd].netif.input(nb, &pppControl[pd].netif);
- return;
- }
- /* Something's wrong so drop it. */
- PPPDEBUG((LOG_WARNING, "pppInput[%d]: Dropping VJ compressedn", pd));
- #else
- /* No handler for this protocol so drop the packet. */
- PPPDEBUG((LOG_INFO, "pppInput[%d]: drop VJ Comp in %d:%sn", pd, nb->len, nb->payload));
- #endif /* VJ_SUPPORT > 0 */
- break;
- case PPP_VJC_UNCOMP: /* VJ uncompressed TCP */
- #if VJ_SUPPORT > 0
- PPPDEBUG((LOG_INFO, "pppInput[%d]: vj_un in pbuf len=%dn", pd, nb->len));
- /*
- * Process the TCP/IP header for VJ header compression and then pass
- * the packet to IP.
- */
- if (vj_uncompress_uncomp(nb, &pppControl[pd].vjComp) >= 0) {
- pppControl[pd].netif.input(nb, &pppControl[pd].netif);
- return;
- }
- /* Something's wrong so drop it. */
- PPPDEBUG((LOG_WARNING, "pppInput[%d]: Dropping VJ uncompressedn", pd));
- #else
- /* No handler for this protocol so drop the packet. */
- PPPDEBUG((LOG_INFO,
- "pppInput[%d]: drop VJ UnComp in %d:.*Hn",
- pd, nb->len, LWIP_MIN(nb->len * 2, 40), nb->payload));
- #endif /* VJ_SUPPORT > 0 */
- break;
- case PPP_IP: /* Internet Protocol */
- PPPDEBUG((LOG_INFO, "pppInput[%d]: ip in pbuf len=%dn", pd, nb->len));
- pppControl[pd].netif.input(nb, &pppControl[pd].netif);
- return;
- default:
- {
- struct protent *protp;
- int i;
- /*
- * Upcall the proper protocol input routine.
- */
- for (i = 0; (protp = ppp_protocols[i]) != NULL; ++i) {
- if (protp->protocol == protocol && protp->enabled_flag) {
- PPPDEBUG((LOG_INFO, "pppInput[%d]: %s len=%dn", pd, protp->name, nb->len));
- nb = pppSingleBuf(nb);
- (*protp->input)(pd, nb->payload, nb->len);
- goto out;
- }
- }
- /* No handler for this protocol so reject the packet. */
- PPPDEBUG((LOG_INFO, "pppInput[%d]: rejecting unsupported proto 0x%04X len=%dn", pd, protocol, nb->len));
- pbuf_header(nb, sizeof(protocol));
- #if BYTE_ORDER == LITTLE_ENDIAN
- protocol = htons(protocol);
- memcpy(nb->payload, &protocol, sizeof(protocol));
- #endif
- lcp_sprotrej(pd, nb->payload, nb->len);
- }
- break;
- }
- drop:
- #if LINK_STATS
- lwip_stats.link.drop++;
- #endif
- out:
- pbuf_free(nb);
- return;
- }
- /*
- * Drop the input packet.
- */
- static void pppDrop(PPPControl *pc)
- {
- if (pc->inHead != NULL) {
- #if 0
- PPPDEBUG((LOG_INFO, "pppDrop: %d:%.*Hn", pc->inHead->len, min(60, pc->inHead->len * 2), pc->inHead->payload));
- #endif
- PPPDEBUG((LOG_INFO, "pppDrop: pbuf len=%dn", pc->inHead->len));
- if (pc->inTail && (pc->inTail != pc->inHead))
- pbuf_free(pc->inTail);
- pbuf_free(pc->inHead);
- pc->inHead = NULL;
- pc->inTail = NULL;
- }
- #if VJ_SUPPORT > 0
- vj_uncompress_err(&pc->vjComp);
- #endif
- #if LINK_STATS
- lwip_stats.link.drop++;
- #endif /* LINK_STATS */
- }
- /*
- * Process a received octet string.
- */
- void pppInProc(int pd, u_char *s, int l)
- {
- PPPControl *pc = &pppControl[pd];
- struct pbuf *nextNBuf;
- u_char curChar;
- PPPDEBUG((LOG_DEBUG, "pppInProc[%d]: got %d bytesn", pd, l));
- while (l-- > 0) {
- curChar = *s++;
-
- /* Handle special characters. */
- if (ESCAPE_P(pc->inACCM, curChar)) {
- /* Check for escape sequences. */
- /* XXX Note that this does not handle an escaped 0x5d character which
- * would appear as an escape character. Since this is an ASCII ']'
- * and there is no reason that I know of to escape it, I won't complicate
- * the code to handle this case. GLL */
- if (curChar == PPP_ESCAPE)
- pc->inEscaped = 1;
- /* Check for the flag character. */
- else if (curChar == PPP_FLAG) {
- /* If this is just an extra flag character, ignore it. */
- if (pc->inState <= PDADDRESS)
- ;
- /* If we haven't received the packet header, drop what has come in. */
- else if (pc->inState < PDDATA) {
- PPPDEBUG((LOG_WARNING,
- "pppInProc[%d]: Dropping incomplete packet %dn",
- pd, pc->inState));
- #if LINK_STATS
- lwip_stats.link.lenerr++;
- #endif
- pppDrop(pc);
- }
- /* If the fcs is invalid, drop the packet. */
- else if (pc->inFCS != PPP_GOODFCS) {
- PPPDEBUG((LOG_INFO,
- "pppInProc[%d]: Dropping bad fcs 0x%04X proto=0x%04Xn",
- pd, pc->inFCS, pc->inProtocol));
- #if LINK_STATS
- lwip_stats.link.chkerr++;
- #endif
- pppDrop(pc);
- }
- /* Otherwise it's a good packet so pass it on. */
- else {
-
- /* Trim off the checksum. */
- if(pc->inTail->len >= 2) {
- pc->inTail->len -= 2;
- pc->inTail->tot_len = pc->inTail->len;
- if (pc->inTail != pc->inHead) {
- pbuf_cat(pc->inHead, pc->inTail);
- }
- } else {
- pc->inTail->tot_len = pc->inTail->len;
- if (pc->inTail != pc->inHead) {
- pbuf_cat(pc->inHead, pc->inTail);
- }
- pbuf_realloc(pc->inHead, pc->inHead->tot_len - 2);
- }
- /* Dispatch the packet thereby consuming it. */
- /*Modified by zhouzhigang 2005.01.16 for single thread*/
- pppInput((void *)(pc->inHead));
- #if 0
- if(tcpip_callback(pppInput, pc->inHead) != ERR_OK) {
- PPPDEBUG((LOG_ERR,
- "pppInProc[%d]: tcpip_callback() failed, dropping packetn", pd));
- pbuf_free(pc->inHead);
- #if LINK_STATS
- lwip_stats.link.drop++;
- #endif
- }
- #endif
- pc->inHead = NULL;
- pc->inTail = NULL;
- }
-
- /* Prepare for a new packet. */
- pc->inFCS = PPP_INITFCS;
- pc->inState = PDADDRESS;
- pc->inEscaped = 0;
- }
- /* Other characters are usually control characters that may have
- * been inserted by the physical layer so here we just drop them. */
- else {
- PPPDEBUG((LOG_WARNING,
- "pppInProc[%d]: Dropping ACCM char <%d>n", pd, curChar));
- }
- }
- /* Process other characters. */
- else {
- /* Unencode escaped characters. */
- if (pc->inEscaped) {
- pc->inEscaped = 0;
- curChar ^= PPP_TRANS;
- }
-
- /* Process character relative to current state. */
- switch(pc->inState) {
- case PDIDLE: /* Idle state - waiting. */
- /* Drop the character if it's not 0xff
- * we would have processed a flag character above. */
- if (curChar != PPP_ALLSTATIONS) {
- break;
- }
- /* Fall through */
- case PDSTART: /* Process start flag. */
- /* Prepare for a new packet. */
- pc->inFCS = PPP_INITFCS;
- /* Fall through */
- case PDADDRESS: /* Process address field. */
- if (curChar == PPP_ALLSTATIONS) {
- pc->inState = PDCONTROL;
- break;
- }
- /* Else assume compressed address and control fields so
- * fall through to get the protocol... */
- case PDCONTROL: /* Process control field. */
- /* If we don't get a valid control code, restart. */
- if (curChar == PPP_UI) {
- pc->inState = PDPROTOCOL1;
- break;
- }
- #if 0
- else {
- PPPDEBUG((LOG_WARNING,
- "pppInProc[%d]: Invalid control <%d>n", pd, curChar));
- pc->inState = PDSTART;
- }
- #endif
- case PDPROTOCOL1: /* Process protocol field 1. */
- /* If the lower bit is set, this is the end of the protocol
- * field. */
- if (curChar & 1) {
- pc->inProtocol = curChar;
- pc->inState = PDDATA;
- }
- else {
- pc->inProtocol = (u_int)curChar << 8;
- pc->inState = PDPROTOCOL2;
- }
- break;
- case PDPROTOCOL2: /* Process protocol field 2. */
- pc->inProtocol |= curChar;
- pc->inState = PDDATA;
- break;
- case PDDATA: /* Process data byte. */
- /* Make space to receive processed data. */
- if (pc->inTail == NULL || pc->inTail->len == PBUF_POOL_BUFSIZE) {
- if(pc->inTail) {
- pc->inTail->tot_len = pc->inTail->len;
- if (pc->inTail != pc->inHead) {
- pbuf_cat(pc->inHead, pc->inTail);
- }
- }
- /* If we haven't started a packet, we need a packet header. */
- nextNBuf = pbuf_alloc(PBUF_RAW, 0, PBUF_POOL);
- if (nextNBuf == NULL) {
- /* No free buffers. Drop the input packet and let the
- * higher layers deal with it. Continue processing
- * the received pbuf chain in case a new packet starts. */
- PPPDEBUG((LOG_ERR, "pppInProc[%d]: NO FREE MBUFS!n", pd));
- #if LINK_STATS
- lwip_stats.link.memerr++;
- #endif /* LINK_STATS */
- pppDrop(pc);
- pc->inState = PDSTART; /* Wait for flag sequence. */
- break;
- }
- if (pc->inHead == NULL) {
- struct pppInputHeader *pih = nextNBuf->payload;
- pih->unit = pd;
- pih->proto = pc->inProtocol;
- nextNBuf->len += sizeof(*pih);
- pc->inHead = nextNBuf;
- }
- pc->inTail = nextNBuf;
- }
- /* Load character into buffer. */
- ((u_char*)pc->inTail->payload)[pc->inTail->len++] = curChar;
- break;
- }
- /* update the frame check sequence number. */
- pc->inFCS = PPP_FCS(pc->inFCS, curChar);
- }
- }
- avRandomize();
- }
- #if( PPP_DEBUG == DBG_ON)
- char debug_buf[1024];
- void ppp_trace(int level, const char *format,...)
- {
-
- sprintf(debug_buf, format);
- DEBUG_EVENT(debug_buf);
- }
- #endif
- #endif /* PPP_SUPPORT */