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-rw-r--r--lwip/src/netif/ppp/fsm.c799
1 files changed, 799 insertions, 0 deletions
diff --git a/lwip/src/netif/ppp/fsm.c b/lwip/src/netif/ppp/fsm.c
new file mode 100644
index 0000000..b1f08af
--- /dev/null
+++ b/lwip/src/netif/ppp/fsm.c
@@ -0,0 +1,799 @@
+/*
+ * fsm.c - {Link, IP} Control Protocol Finite State Machine.
+ *
+ * Copyright (c) 1984-2000 Carnegie Mellon University. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in
+ * the documentation and/or other materials provided with the
+ * distribution.
+ *
+ * 3. The name "Carnegie Mellon University" must not be used to
+ * endorse or promote products derived from this software without
+ * prior written permission. For permission or any legal
+ * details, please contact
+ * Office of Technology Transfer
+ * Carnegie Mellon University
+ * 5000 Forbes Avenue
+ * Pittsburgh, PA 15213-3890
+ * (412) 268-4387, fax: (412) 268-7395
+ * tech-transfer@andrew.cmu.edu
+ *
+ * 4. Redistributions of any form whatsoever must retain the following
+ * acknowledgment:
+ * "This product includes software developed by Computing Services
+ * at Carnegie Mellon University (http://www.cmu.edu/computing/)."
+ *
+ * CARNEGIE MELLON UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO
+ * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+ * AND FITNESS, IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY BE LIABLE
+ * FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
+ * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
+ * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include "netif/ppp/ppp_opts.h"
+#if PPP_SUPPORT /* don't build if not configured for use in lwipopts.h */
+
+/*
+ * @todo:
+ * Randomize fsm id on link/init.
+ * Deal with variable outgoing MTU.
+ */
+
+#if 0 /* UNUSED */
+#include <stdio.h>
+#include <string.h>
+#include <sys/types.h>
+#endif /* UNUSED */
+
+#include "netif/ppp/ppp_impl.h"
+
+#include "netif/ppp/fsm.h"
+
+static void fsm_timeout (void *);
+static void fsm_rconfreq(fsm *f, u_char id, u_char *inp, int len);
+static void fsm_rconfack(fsm *f, int id, u_char *inp, int len);
+static void fsm_rconfnakrej(fsm *f, int code, int id, u_char *inp, int len);
+static void fsm_rtermreq(fsm *f, int id, u_char *p, int len);
+static void fsm_rtermack(fsm *f);
+static void fsm_rcoderej(fsm *f, u_char *inp, int len);
+static void fsm_sconfreq(fsm *f, int retransmit);
+
+#define PROTO_NAME(f) ((f)->callbacks->proto_name)
+
+/*
+ * fsm_init - Initialize fsm.
+ *
+ * Initialize fsm state.
+ */
+void fsm_init(fsm *f) {
+ ppp_pcb *pcb = f->pcb;
+ f->state = PPP_FSM_INITIAL;
+ f->flags = 0;
+ f->id = 0; /* XXX Start with random id? */
+ f->maxnakloops = pcb->settings.fsm_max_nak_loops;
+ f->term_reason_len = 0;
+}
+
+
+/*
+ * fsm_lowerup - The lower layer is up.
+ */
+void fsm_lowerup(fsm *f) {
+ switch( f->state ){
+ case PPP_FSM_INITIAL:
+ f->state = PPP_FSM_CLOSED;
+ break;
+
+ case PPP_FSM_STARTING:
+ if( f->flags & OPT_SILENT )
+ f->state = PPP_FSM_STOPPED;
+ else {
+ /* Send an initial configure-request */
+ fsm_sconfreq(f, 0);
+ f->state = PPP_FSM_REQSENT;
+ }
+ break;
+
+ default:
+ FSMDEBUG(("%s: Up event in state %d!", PROTO_NAME(f), f->state));
+ /* no break */
+ }
+}
+
+
+/*
+ * fsm_lowerdown - The lower layer is down.
+ *
+ * Cancel all timeouts and inform upper layers.
+ */
+void fsm_lowerdown(fsm *f) {
+ switch( f->state ){
+ case PPP_FSM_CLOSED:
+ f->state = PPP_FSM_INITIAL;
+ break;
+
+ case PPP_FSM_STOPPED:
+ f->state = PPP_FSM_STARTING;
+ if( f->callbacks->starting )
+ (*f->callbacks->starting)(f);
+ break;
+
+ case PPP_FSM_CLOSING:
+ f->state = PPP_FSM_INITIAL;
+ UNTIMEOUT(fsm_timeout, f); /* Cancel timeout */
+ break;
+
+ case PPP_FSM_STOPPING:
+ case PPP_FSM_REQSENT:
+ case PPP_FSM_ACKRCVD:
+ case PPP_FSM_ACKSENT:
+ f->state = PPP_FSM_STARTING;
+ UNTIMEOUT(fsm_timeout, f); /* Cancel timeout */
+ break;
+
+ case PPP_FSM_OPENED:
+ if( f->callbacks->down )
+ (*f->callbacks->down)(f);
+ f->state = PPP_FSM_STARTING;
+ break;
+
+ default:
+ FSMDEBUG(("%s: Down event in state %d!", PROTO_NAME(f), f->state));
+ /* no break */
+ }
+}
+
+
+/*
+ * fsm_open - Link is allowed to come up.
+ */
+void fsm_open(fsm *f) {
+ switch( f->state ){
+ case PPP_FSM_INITIAL:
+ f->state = PPP_FSM_STARTING;
+ if( f->callbacks->starting )
+ (*f->callbacks->starting)(f);
+ break;
+
+ case PPP_FSM_CLOSED:
+ if( f->flags & OPT_SILENT )
+ f->state = PPP_FSM_STOPPED;
+ else {
+ /* Send an initial configure-request */
+ fsm_sconfreq(f, 0);
+ f->state = PPP_FSM_REQSENT;
+ }
+ break;
+
+ case PPP_FSM_CLOSING:
+ f->state = PPP_FSM_STOPPING;
+ /* fall through */
+ /* no break */
+ case PPP_FSM_STOPPED:
+ case PPP_FSM_OPENED:
+ if( f->flags & OPT_RESTART ){
+ fsm_lowerdown(f);
+ fsm_lowerup(f);
+ }
+ break;
+ default:
+ break;
+ }
+}
+
+/*
+ * terminate_layer - Start process of shutting down the FSM
+ *
+ * Cancel any timeout running, notify upper layers we're done, and
+ * send a terminate-request message as configured.
+ */
+static void terminate_layer(fsm *f, int nextstate) {
+ ppp_pcb *pcb = f->pcb;
+
+ if( f->state != PPP_FSM_OPENED )
+ UNTIMEOUT(fsm_timeout, f); /* Cancel timeout */
+ else if( f->callbacks->down )
+ (*f->callbacks->down)(f); /* Inform upper layers we're down */
+
+ /* Init restart counter and send Terminate-Request */
+ f->retransmits = pcb->settings.fsm_max_term_transmits;
+ fsm_sdata(f, TERMREQ, f->reqid = ++f->id,
+ (const u_char *) f->term_reason, f->term_reason_len);
+
+ if (f->retransmits == 0) {
+ /*
+ * User asked for no terminate requests at all; just close it.
+ * We've already fired off one Terminate-Request just to be nice
+ * to the peer, but we're not going to wait for a reply.
+ */
+ f->state = nextstate == PPP_FSM_CLOSING ? PPP_FSM_CLOSED : PPP_FSM_STOPPED;
+ if( f->callbacks->finished )
+ (*f->callbacks->finished)(f);
+ return;
+ }
+
+ TIMEOUT(fsm_timeout, f, pcb->settings.fsm_timeout_time);
+ --f->retransmits;
+
+ f->state = nextstate;
+}
+
+/*
+ * fsm_close - Start closing connection.
+ *
+ * Cancel timeouts and either initiate close or possibly go directly to
+ * the PPP_FSM_CLOSED state.
+ */
+void fsm_close(fsm *f, const char *reason) {
+ f->term_reason = reason;
+ f->term_reason_len = (reason == NULL? 0: (u8_t)LWIP_MIN(strlen(reason), 0xFF) );
+ switch( f->state ){
+ case PPP_FSM_STARTING:
+ f->state = PPP_FSM_INITIAL;
+ break;
+ case PPP_FSM_STOPPED:
+ f->state = PPP_FSM_CLOSED;
+ break;
+ case PPP_FSM_STOPPING:
+ f->state = PPP_FSM_CLOSING;
+ break;
+
+ case PPP_FSM_REQSENT:
+ case PPP_FSM_ACKRCVD:
+ case PPP_FSM_ACKSENT:
+ case PPP_FSM_OPENED:
+ terminate_layer(f, PPP_FSM_CLOSING);
+ break;
+ default:
+ break;
+ }
+}
+
+
+/*
+ * fsm_timeout - Timeout expired.
+ */
+static void fsm_timeout(void *arg) {
+ fsm *f = (fsm *) arg;
+ ppp_pcb *pcb = f->pcb;
+
+ switch (f->state) {
+ case PPP_FSM_CLOSING:
+ case PPP_FSM_STOPPING:
+ if( f->retransmits <= 0 ){
+ /*
+ * We've waited for an ack long enough. Peer probably heard us.
+ */
+ f->state = (f->state == PPP_FSM_CLOSING)? PPP_FSM_CLOSED: PPP_FSM_STOPPED;
+ if( f->callbacks->finished )
+ (*f->callbacks->finished)(f);
+ } else {
+ /* Send Terminate-Request */
+ fsm_sdata(f, TERMREQ, f->reqid = ++f->id,
+ (const u_char *) f->term_reason, f->term_reason_len);
+ TIMEOUT(fsm_timeout, f, pcb->settings.fsm_timeout_time);
+ --f->retransmits;
+ }
+ break;
+
+ case PPP_FSM_REQSENT:
+ case PPP_FSM_ACKRCVD:
+ case PPP_FSM_ACKSENT:
+ if (f->retransmits <= 0) {
+ ppp_warn("%s: timeout sending Config-Requests", PROTO_NAME(f));
+ f->state = PPP_FSM_STOPPED;
+ if( (f->flags & OPT_PASSIVE) == 0 && f->callbacks->finished )
+ (*f->callbacks->finished)(f);
+
+ } else {
+ /* Retransmit the configure-request */
+ if (f->callbacks->retransmit)
+ (*f->callbacks->retransmit)(f);
+ fsm_sconfreq(f, 1); /* Re-send Configure-Request */
+ if( f->state == PPP_FSM_ACKRCVD )
+ f->state = PPP_FSM_REQSENT;
+ }
+ break;
+
+ default:
+ FSMDEBUG(("%s: Timeout event in state %d!", PROTO_NAME(f), f->state));
+ /* no break */
+ }
+}
+
+
+/*
+ * fsm_input - Input packet.
+ */
+void fsm_input(fsm *f, u_char *inpacket, int l) {
+ u_char *inp;
+ u_char code, id;
+ int len;
+
+ /*
+ * Parse header (code, id and length).
+ * If packet too short, drop it.
+ */
+ inp = inpacket;
+ if (l < HEADERLEN) {
+ FSMDEBUG(("fsm_input(%x): Rcvd short header.", f->protocol));
+ return;
+ }
+ GETCHAR(code, inp);
+ GETCHAR(id, inp);
+ GETSHORT(len, inp);
+ if (len < HEADERLEN) {
+ FSMDEBUG(("fsm_input(%x): Rcvd illegal length.", f->protocol));
+ return;
+ }
+ if (len > l) {
+ FSMDEBUG(("fsm_input(%x): Rcvd short packet.", f->protocol));
+ return;
+ }
+ len -= HEADERLEN; /* subtract header length */
+
+ if( f->state == PPP_FSM_INITIAL || f->state == PPP_FSM_STARTING ){
+ FSMDEBUG(("fsm_input(%x): Rcvd packet in state %d.",
+ f->protocol, f->state));
+ return;
+ }
+
+ /*
+ * Action depends on code.
+ */
+ switch (code) {
+ case CONFREQ:
+ fsm_rconfreq(f, id, inp, len);
+ break;
+
+ case CONFACK:
+ fsm_rconfack(f, id, inp, len);
+ break;
+
+ case CONFNAK:
+ case CONFREJ:
+ fsm_rconfnakrej(f, code, id, inp, len);
+ break;
+
+ case TERMREQ:
+ fsm_rtermreq(f, id, inp, len);
+ break;
+
+ case TERMACK:
+ fsm_rtermack(f);
+ break;
+
+ case CODEREJ:
+ fsm_rcoderej(f, inp, len);
+ break;
+
+ default:
+ if( !f->callbacks->extcode
+ || !(*f->callbacks->extcode)(f, code, id, inp, len) )
+ fsm_sdata(f, CODEREJ, ++f->id, inpacket, len + HEADERLEN);
+ break;
+ }
+}
+
+
+/*
+ * fsm_rconfreq - Receive Configure-Request.
+ */
+static void fsm_rconfreq(fsm *f, u_char id, u_char *inp, int len) {
+ int code, reject_if_disagree;
+
+ switch( f->state ){
+ case PPP_FSM_CLOSED:
+ /* Go away, we're closed */
+ fsm_sdata(f, TERMACK, id, NULL, 0);
+ return;
+ case PPP_FSM_CLOSING:
+ case PPP_FSM_STOPPING:
+ return;
+
+ case PPP_FSM_OPENED:
+ /* Go down and restart negotiation */
+ if( f->callbacks->down )
+ (*f->callbacks->down)(f); /* Inform upper layers */
+ fsm_sconfreq(f, 0); /* Send initial Configure-Request */
+ f->state = PPP_FSM_REQSENT;
+ break;
+
+ case PPP_FSM_STOPPED:
+ /* Negotiation started by our peer */
+ fsm_sconfreq(f, 0); /* Send initial Configure-Request */
+ f->state = PPP_FSM_REQSENT;
+ break;
+ default:
+ break;
+ }
+
+ /*
+ * Pass the requested configuration options
+ * to protocol-specific code for checking.
+ */
+ if (f->callbacks->reqci){ /* Check CI */
+ reject_if_disagree = (f->nakloops >= f->maxnakloops);
+ code = (*f->callbacks->reqci)(f, inp, &len, reject_if_disagree);
+ } else if (len)
+ code = CONFREJ; /* Reject all CI */
+ else
+ code = CONFACK;
+
+ /* send the Ack, Nak or Rej to the peer */
+ fsm_sdata(f, code, id, inp, len);
+
+ if (code == CONFACK) {
+ if (f->state == PPP_FSM_ACKRCVD) {
+ UNTIMEOUT(fsm_timeout, f); /* Cancel timeout */
+ f->state = PPP_FSM_OPENED;
+ if (f->callbacks->up)
+ (*f->callbacks->up)(f); /* Inform upper layers */
+ } else
+ f->state = PPP_FSM_ACKSENT;
+ f->nakloops = 0;
+
+ } else {
+ /* we sent CONFACK or CONFREJ */
+ if (f->state != PPP_FSM_ACKRCVD)
+ f->state = PPP_FSM_REQSENT;
+ if( code == CONFNAK )
+ ++f->nakloops;
+ }
+}
+
+
+/*
+ * fsm_rconfack - Receive Configure-Ack.
+ */
+static void fsm_rconfack(fsm *f, int id, u_char *inp, int len) {
+ ppp_pcb *pcb = f->pcb;
+
+ if (id != f->reqid || f->seen_ack) /* Expected id? */
+ return; /* Nope, toss... */
+ if( !(f->callbacks->ackci? (*f->callbacks->ackci)(f, inp, len):
+ (len == 0)) ){
+ /* Ack is bad - ignore it */
+ ppp_error("Received bad configure-ack: %P", inp, len);
+ return;
+ }
+ f->seen_ack = 1;
+ f->rnakloops = 0;
+
+ switch (f->state) {
+ case PPP_FSM_CLOSED:
+ case PPP_FSM_STOPPED:
+ fsm_sdata(f, TERMACK, id, NULL, 0);
+ break;
+
+ case PPP_FSM_REQSENT:
+ f->state = PPP_FSM_ACKRCVD;
+ f->retransmits = pcb->settings.fsm_max_conf_req_transmits;
+ break;
+
+ case PPP_FSM_ACKRCVD:
+ /* Huh? an extra valid Ack? oh well... */
+ UNTIMEOUT(fsm_timeout, f); /* Cancel timeout */
+ fsm_sconfreq(f, 0);
+ f->state = PPP_FSM_REQSENT;
+ break;
+
+ case PPP_FSM_ACKSENT:
+ UNTIMEOUT(fsm_timeout, f); /* Cancel timeout */
+ f->state = PPP_FSM_OPENED;
+ f->retransmits = pcb->settings.fsm_max_conf_req_transmits;
+ if (f->callbacks->up)
+ (*f->callbacks->up)(f); /* Inform upper layers */
+ break;
+
+ case PPP_FSM_OPENED:
+ /* Go down and restart negotiation */
+ if (f->callbacks->down)
+ (*f->callbacks->down)(f); /* Inform upper layers */
+ fsm_sconfreq(f, 0); /* Send initial Configure-Request */
+ f->state = PPP_FSM_REQSENT;
+ break;
+ default:
+ break;
+ }
+}
+
+
+/*
+ * fsm_rconfnakrej - Receive Configure-Nak or Configure-Reject.
+ */
+static void fsm_rconfnakrej(fsm *f, int code, int id, u_char *inp, int len) {
+ int ret;
+ int treat_as_reject;
+
+ if (id != f->reqid || f->seen_ack) /* Expected id? */
+ return; /* Nope, toss... */
+
+ if (code == CONFNAK) {
+ ++f->rnakloops;
+ treat_as_reject = (f->rnakloops >= f->maxnakloops);
+ if (f->callbacks->nakci == NULL
+ || !(ret = f->callbacks->nakci(f, inp, len, treat_as_reject))) {
+ ppp_error("Received bad configure-nak: %P", inp, len);
+ return;
+ }
+ } else {
+ f->rnakloops = 0;
+ if (f->callbacks->rejci == NULL
+ || !(ret = f->callbacks->rejci(f, inp, len))) {
+ ppp_error("Received bad configure-rej: %P", inp, len);
+ return;
+ }
+ }
+
+ f->seen_ack = 1;
+
+ switch (f->state) {
+ case PPP_FSM_CLOSED:
+ case PPP_FSM_STOPPED:
+ fsm_sdata(f, TERMACK, id, NULL, 0);
+ break;
+
+ case PPP_FSM_REQSENT:
+ case PPP_FSM_ACKSENT:
+ /* They didn't agree to what we wanted - try another request */
+ UNTIMEOUT(fsm_timeout, f); /* Cancel timeout */
+ if (ret < 0)
+ f->state = PPP_FSM_STOPPED; /* kludge for stopping CCP */
+ else
+ fsm_sconfreq(f, 0); /* Send Configure-Request */
+ break;
+
+ case PPP_FSM_ACKRCVD:
+ /* Got a Nak/reject when we had already had an Ack?? oh well... */
+ UNTIMEOUT(fsm_timeout, f); /* Cancel timeout */
+ fsm_sconfreq(f, 0);
+ f->state = PPP_FSM_REQSENT;
+ break;
+
+ case PPP_FSM_OPENED:
+ /* Go down and restart negotiation */
+ if (f->callbacks->down)
+ (*f->callbacks->down)(f); /* Inform upper layers */
+ fsm_sconfreq(f, 0); /* Send initial Configure-Request */
+ f->state = PPP_FSM_REQSENT;
+ break;
+ default:
+ break;
+ }
+}
+
+
+/*
+ * fsm_rtermreq - Receive Terminate-Req.
+ */
+static void fsm_rtermreq(fsm *f, int id, u_char *p, int len) {
+ ppp_pcb *pcb = f->pcb;
+
+ switch (f->state) {
+ case PPP_FSM_ACKRCVD:
+ case PPP_FSM_ACKSENT:
+ f->state = PPP_FSM_REQSENT; /* Start over but keep trying */
+ break;
+
+ case PPP_FSM_OPENED:
+ if (len > 0) {
+ ppp_info("%s terminated by peer (%0.*v)", PROTO_NAME(f), len, p);
+ } else
+ ppp_info("%s terminated by peer", PROTO_NAME(f));
+ f->retransmits = 0;
+ f->state = PPP_FSM_STOPPING;
+ if (f->callbacks->down)
+ (*f->callbacks->down)(f); /* Inform upper layers */
+ TIMEOUT(fsm_timeout, f, pcb->settings.fsm_timeout_time);
+ break;
+ default:
+ break;
+ }
+
+ fsm_sdata(f, TERMACK, id, NULL, 0);
+}
+
+
+/*
+ * fsm_rtermack - Receive Terminate-Ack.
+ */
+static void fsm_rtermack(fsm *f) {
+ switch (f->state) {
+ case PPP_FSM_CLOSING:
+ UNTIMEOUT(fsm_timeout, f);
+ f->state = PPP_FSM_CLOSED;
+ if( f->callbacks->finished )
+ (*f->callbacks->finished)(f);
+ break;
+ case PPP_FSM_STOPPING:
+ UNTIMEOUT(fsm_timeout, f);
+ f->state = PPP_FSM_STOPPED;
+ if( f->callbacks->finished )
+ (*f->callbacks->finished)(f);
+ break;
+
+ case PPP_FSM_ACKRCVD:
+ f->state = PPP_FSM_REQSENT;
+ break;
+
+ case PPP_FSM_OPENED:
+ if (f->callbacks->down)
+ (*f->callbacks->down)(f); /* Inform upper layers */
+ fsm_sconfreq(f, 0);
+ f->state = PPP_FSM_REQSENT;
+ break;
+ default:
+ break;
+ }
+}
+
+
+/*
+ * fsm_rcoderej - Receive an Code-Reject.
+ */
+static void fsm_rcoderej(fsm *f, u_char *inp, int len) {
+ u_char code, id;
+
+ if (len < HEADERLEN) {
+ FSMDEBUG(("fsm_rcoderej: Rcvd short Code-Reject packet!"));
+ return;
+ }
+ GETCHAR(code, inp);
+ GETCHAR(id, inp);
+ ppp_warn("%s: Rcvd Code-Reject for code %d, id %d", PROTO_NAME(f), code, id);
+
+ if( f->state == PPP_FSM_ACKRCVD )
+ f->state = PPP_FSM_REQSENT;
+}
+
+
+/*
+ * fsm_protreject - Peer doesn't speak this protocol.
+ *
+ * Treat this as a catastrophic error (RXJ-).
+ */
+void fsm_protreject(fsm *f) {
+ switch( f->state ){
+ case PPP_FSM_CLOSING:
+ UNTIMEOUT(fsm_timeout, f); /* Cancel timeout */
+ /* fall through */
+ /* no break */
+ case PPP_FSM_CLOSED:
+ f->state = PPP_FSM_CLOSED;
+ if( f->callbacks->finished )
+ (*f->callbacks->finished)(f);
+ break;
+
+ case PPP_FSM_STOPPING:
+ case PPP_FSM_REQSENT:
+ case PPP_FSM_ACKRCVD:
+ case PPP_FSM_ACKSENT:
+ UNTIMEOUT(fsm_timeout, f); /* Cancel timeout */
+ /* fall through */
+ /* no break */
+ case PPP_FSM_STOPPED:
+ f->state = PPP_FSM_STOPPED;
+ if( f->callbacks->finished )
+ (*f->callbacks->finished)(f);
+ break;
+
+ case PPP_FSM_OPENED:
+ terminate_layer(f, PPP_FSM_STOPPING);
+ break;
+
+ default:
+ FSMDEBUG(("%s: Protocol-reject event in state %d!",
+ PROTO_NAME(f), f->state));
+ /* no break */
+ }
+}
+
+
+/*
+ * fsm_sconfreq - Send a Configure-Request.
+ */
+static void fsm_sconfreq(fsm *f, int retransmit) {
+ ppp_pcb *pcb = f->pcb;
+ struct pbuf *p;
+ u_char *outp;
+ int cilen;
+
+ if( f->state != PPP_FSM_REQSENT && f->state != PPP_FSM_ACKRCVD && f->state != PPP_FSM_ACKSENT ){
+ /* Not currently negotiating - reset options */
+ if( f->callbacks->resetci )
+ (*f->callbacks->resetci)(f);
+ f->nakloops = 0;
+ f->rnakloops = 0;
+ }
+
+ if( !retransmit ){
+ /* New request - reset retransmission counter, use new ID */
+ f->retransmits = pcb->settings.fsm_max_conf_req_transmits;
+ f->reqid = ++f->id;
+ }
+
+ f->seen_ack = 0;
+
+ /*
+ * Make up the request packet
+ */
+ if( f->callbacks->cilen && f->callbacks->addci ){
+ cilen = (*f->callbacks->cilen)(f);
+ if( cilen > pcb->peer_mru - HEADERLEN )
+ cilen = pcb->peer_mru - HEADERLEN;
+ } else
+ cilen = 0;
+
+ p = pbuf_alloc(PBUF_RAW, (u16_t)(cilen + HEADERLEN + PPP_HDRLEN), PPP_CTRL_PBUF_TYPE);
+ if(NULL == p)
+ return;
+ if(p->tot_len != p->len) {
+ pbuf_free(p);
+ return;
+ }
+
+ /* send the request to our peer */
+ outp = (u_char*)p->payload;
+ MAKEHEADER(outp, f->protocol);
+ PUTCHAR(CONFREQ, outp);
+ PUTCHAR(f->reqid, outp);
+ PUTSHORT(cilen + HEADERLEN, outp);
+ if (cilen != 0) {
+ (*f->callbacks->addci)(f, outp, &cilen);
+ LWIP_ASSERT("cilen == p->len - HEADERLEN - PPP_HDRLEN", cilen == p->len - HEADERLEN - PPP_HDRLEN);
+ }
+
+ ppp_write(pcb, p);
+
+ /* start the retransmit timer */
+ --f->retransmits;
+ TIMEOUT(fsm_timeout, f, pcb->settings.fsm_timeout_time);
+}
+
+
+/*
+ * fsm_sdata - Send some data.
+ *
+ * Used for all packets sent to our peer by this module.
+ */
+void fsm_sdata(fsm *f, u_char code, u_char id, const u_char *data, int datalen) {
+ ppp_pcb *pcb = f->pcb;
+ struct pbuf *p;
+ u_char *outp;
+ int outlen;
+
+ /* Adjust length to be smaller than MTU */
+ if (datalen > pcb->peer_mru - HEADERLEN)
+ datalen = pcb->peer_mru - HEADERLEN;
+ outlen = datalen + HEADERLEN;
+
+ p = pbuf_alloc(PBUF_RAW, (u16_t)(outlen + PPP_HDRLEN), PPP_CTRL_PBUF_TYPE);
+ if(NULL == p)
+ return;
+ if(p->tot_len != p->len) {
+ pbuf_free(p);
+ return;
+ }
+
+ outp = (u_char*)p->payload;
+ if (datalen) /* && data != outp + PPP_HDRLEN + HEADERLEN) -- was only for fsm_sconfreq() */
+ MEMCPY(outp + PPP_HDRLEN + HEADERLEN, data, datalen);
+ MAKEHEADER(outp, f->protocol);
+ PUTCHAR(code, outp);
+ PUTCHAR(id, outp);
+ PUTSHORT(outlen, outp);
+ ppp_write(pcb, p);
+}
+
+#endif /* PPP_SUPPORT */
generated by cgit v1.2.3 (git 2.25.1) at 2024-05-02 18:46:51 +0000