| /***************************************************************************** |
| * 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); |
| static void pppInProc(int pd, u_char *s, int l); |
| |
| |
| /******************************/ |
| /*** 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; |
| pppSetAuth(PPPAUTHTYPE_NONE, NULL, NULL); |
| |
| 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] = '\0'; |
| } else |
| ppp_settings.user[0] = '\0'; |
| |
| if(passwd) { |
| strncpy(ppp_settings.passwd, passwd, sizeof(ppp_settings.passwd)-1); |
| ppp_settings.passwd[sizeof(ppp_settings.passwd)-1] = '\0'; |
| } else |
| ppp_settings.passwd[0] = '\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; |
| |
| sys_thread_new(pppMain, (void*)pd, PPP_THREAD_PRIO); |
| 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; |
| |
| 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) = %d\n", 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=%p\n", |
| 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 up\n", 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 fail\n", 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 packet\n", 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=%d\n", |
| 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%04X\n", 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=%d\n", 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=%d\n", 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 %X\n", |
| 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 %X\n", |
| 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 %X\n", |
| 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=%d\n", |
| 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 parms\n", 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; |
| |
| PPPDEBUG((LOG_DEBUG, "sifup: unit %d: linkStatusCB=%lx errCode=%d\n", 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 failed\n", 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 parms\n", pd)); |
| } else { |
| pc->if_up = 0; |
| netif_remove(&pc->netif); |
| PPPDEBUG((LOG_DEBUG, "sifdown: unit %d: linkStatusCB=%lx errCode=%d\n", 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 parms\n", 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 parms\n", 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 parms\n", 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 parms\n", pd)); |
| } else { |
| netif_set_default(NULL); |
| } |
| |
| return st; |
| } |
| |
| void |
| pppMainWakeup(int pd) |
| { |
| PPPDEBUG((LOG_DEBUG, "pppMainWakeup: unit %d\n", 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 %d\n", pd)); |
| lcp_lowerup(pd); |
| lcp_open(pd); /* Start protocol */ |
| } |
| |
| static void |
| pppStopCB(void *arg) |
| { |
| int pd = (int)arg; |
| |
| PPPDEBUG((LOG_DEBUG, "pppStopCB: unit %d\n", pd)); |
| lcp_close(pd, "User request"); |
| } |
| |
| static void |
| pppHupCB(void *arg) |
| { |
| int pd = (int)arg; |
| |
| PPPDEBUG((LOG_DEBUG, "pppHupCB: unit %d\n", 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. */ |
| 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: Connecting\n", pd)); |
| tcpip_callback(pppStartCB, arg); |
| while (lcp_phase[pd] != PHASE_DEAD) { |
| if (pc->kill_link) { |
| PPPDEBUG((LOG_DEBUG, "pppMainWakeup: unit %d kill_link -> pppStopCB\n", 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 -> pppHupCB\n", pd)); |
| pc->sig_hup = 0; |
| tcpip_callback(pppHupCB, arg); |
| } else { |
| 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 %d\n", pd, p->len, c)); |
| sys_msleep(1); /* give other tasks a chance to run */ |
| } |
| } |
| } |
| PPPDEBUG((LOG_INFO, "pppMain: unit %d: PHASE_DEAD\n", pd)); |
| pbuf_free(p); |
| |
| out: |
| PPPDEBUG((LOG_DEBUG, "pppMain: unit %d: linkStatusCB=%lx errCode=%d\n", pd, pc->linkStatusCB, pc->errCode)); |
| if(pc->linkStatusCB) |
| pc->linkStatusCB(pc->linkStatusCtx, pc->errCode ? pc->errCode : PPPERR_PROTOCOL, NULL); |
| |
| pc->openFlag = 0; |
| } |
| |
| 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 %d\n", 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=%d\n", 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 compressed\n", pd)); |
| #else |
| /* No handler for this protocol so drop the packet. */ |
| PPPDEBUG((LOG_INFO, "pppInput[%d]: drop VJ Comp in %d:%s\n", 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=%d\n", 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 uncompressed\n", pd)); |
| #else |
| /* No handler for this protocol so drop the packet. */ |
| PPPDEBUG((LOG_INFO, |
| "pppInput[%d]: drop VJ UnComp in %d:.*H\n", |
| 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=%d\n", 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=%d\n", 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=%d\n", 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:%.*H\n", pc->inHead->len, min(60, pc->inHead->len * 2), pc->inHead->payload)); |
| #endif |
| PPPDEBUG((LOG_INFO, "pppDrop: pbuf len=%d\n", 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. |
| */ |
| static 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 bytes\n", 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 %d\n", |
| 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%04X\n", |
| 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. */ |
| if(tcpip_callback(pppInput, pc->inHead) != ERR_OK) { |
| PPPDEBUG((LOG_ERR, |
| "pppInProc[%d]: tcpip_callback() failed, dropping packet\n", pd)); |
| pbuf_free(pc->inHead); |
| #if LINK_STATS |
| lwip_stats.link.drop++; |
| #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(); |
| } |
| |
| #endif /* PPP_SUPPORT */ |