* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
-#define RCSID "$Id: lcp.c,v 1.76 2006/05/22 00:04:07 paulus Exp $"
-
-/*
- * TODO:
- */
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
+#include <fcntl.h>
+#include <string.h>
+#include <time.h>
+#include <arpa/inet.h>
+#include <sys/mman.h>
-#include "pppd.h"
+#include "pppd-private.h"
+#include "options.h"
#include "fsm.h"
#include "lcp.h"
-#include "chap-new.h"
+#include "eap.h"
+#include "chap.h"
#include "magic.h"
-
+#include "multilink.h"
/*
* When the link comes up we want to be able to wait for a short while,
/* steal a bit in fsm flags word */
#define DELAYED_UP 0x100
-static void lcp_delayed_up __P((void *));
+static void lcp_delayed_up(void *);
+
+/*
+ * These definitions relate to the measurement and logging of round-trip
+ * time (RTT) of LCP echo-requests implemented in lcp_rtt_update_buffer().
+ */
+#define LCP_RTT_MAGIC 0x19450425
+#define LCP_RTT_HEADER_LENGTH 4
+#define LCP_RTT_FILE_SIZE 8192
+#define LCP_RTT_ELEMENTS (LCP_RTT_FILE_SIZE / sizeof(u_int32_t) - LCP_RTT_HEADER_LENGTH) / 2
/*
* LCP-related command-line options.
*/
int lcp_echo_interval = 0; /* Interval between LCP echo-requests */
int lcp_echo_fails = 0; /* Tolerance to unanswered echo-requests */
+bool lcp_echo_adaptive = 0; /* request echo only if the link was idle */
+char *lcp_rtt_file = NULL; /* measure the RTT of LCP echo-requests */
bool lax_recv = 0; /* accept control chars in asyncmap */
bool noendpoint = 0; /* don't send/accept endpoint discriminator */
-static int noopt __P((char **));
+static int noopt(char **);
-#ifdef HAVE_MULTILINK
-static int setendpoint __P((char **));
-static void printendpoint __P((option_t *, void (*)(void *, char *, ...),
- void *));
-#endif /* HAVE_MULTILINK */
+#ifdef PPP_WITH_MULTILINK
+static int setendpoint(char **);
+static void printendpoint(option_t *, void (*)(void *, char *, ...), void *);
+#endif /* PPP_WITH_MULTILINK */
-static option_t lcp_option_list[] = {
+static struct option lcp_option_list[] = {
/* LCP options */
{ "-all", o_special_noarg, (void *)noopt,
"Don't request/allow any LCP options" },
OPT_PRIO },
{ "lcp-echo-interval", o_int, &lcp_echo_interval,
"Set time in seconds between LCP echo requests", OPT_PRIO },
+ { "lcp-echo-adaptive", o_bool, &lcp_echo_adaptive,
+ "Suppress LCP echo requests if traffic was received", 1 },
+ { "lcp-rtt-file", o_string, &lcp_rtt_file,
+ "Filename for logging the round-trip time of LCP echo requests",
+ OPT_PRIO | OPT_PRIV },
{ "lcp-restart", o_int, &lcp_fsm[0].timeouttime,
"Set time in seconds between LCP retransmissions", OPT_PRIO },
{ "lcp-max-terminate", o_int, &lcp_fsm[0].maxtermtransmits,
{ "receive-all", o_bool, &lax_recv,
"Accept all received control characters", 1 },
-#ifdef HAVE_MULTILINK
+#ifdef PPP_WITH_MULTILINK
{ "mrru", o_int, &lcp_wantoptions[0].mrru,
"Maximum received packet size for multilink bundle",
OPT_PRIO, &lcp_wantoptions[0].neg_mrru },
{ "endpoint", o_special, (void *) setendpoint,
"Endpoint discriminator for multilink",
OPT_PRIO | OPT_A2PRINTER, (void *) printendpoint },
-#endif /* HAVE_MULTILINK */
+#endif /* PPP_WITH_MULTILINK */
{ "noendpoint", o_bool, &noendpoint,
"Don't send or accept multilink endpoint discriminator", 1 },
static int lcp_echos_pending = 0; /* Number of outstanding echo msgs */
static int lcp_echo_number = 0; /* ID number of next echo frame */
static int lcp_echo_timer_running = 0; /* set if a timer is running */
+static int lcp_rtt_file_fd = 0; /* fd for the opened LCP RTT file */
+static u_int32_t *lcp_rtt_buffer = NULL; /* the mmap'ed LCP RTT file */
static u_char nak_buffer[PPP_MRU]; /* where we construct a nak packet */
/*
* Callbacks for fsm code. (CI = Configuration Information)
*/
-static void lcp_resetci __P((fsm *)); /* Reset our CI */
-static int lcp_cilen __P((fsm *)); /* Return length of our CI */
-static void lcp_addci __P((fsm *, u_char *, int *)); /* Add our CI to pkt */
-static int lcp_ackci __P((fsm *, u_char *, int)); /* Peer ack'd our CI */
-static int lcp_nakci __P((fsm *, u_char *, int, int)); /* Peer nak'd our CI */
-static int lcp_rejci __P((fsm *, u_char *, int)); /* Peer rej'd our CI */
-static int lcp_reqci __P((fsm *, u_char *, int *, int)); /* Rcv peer CI */
-static void lcp_up __P((fsm *)); /* We're UP */
-static void lcp_down __P((fsm *)); /* We're DOWN */
-static void lcp_starting __P((fsm *)); /* We need lower layer up */
-static void lcp_finished __P((fsm *)); /* We need lower layer down */
-static int lcp_extcode __P((fsm *, int, int, u_char *, int));
-static void lcp_rprotrej __P((fsm *, u_char *, int));
+static void lcp_resetci(fsm *); /* Reset our CI */
+static int lcp_cilen(fsm *); /* Return length of our CI */
+static void lcp_addci(fsm *, u_char *, int *); /* Add our CI to pkt */
+static int lcp_ackci(fsm *, u_char *, int); /* Peer ack'd our CI */
+static int lcp_nakci(fsm *, u_char *, int, int); /* Peer nak'd our CI */
+static int lcp_rejci(fsm *, u_char *, int); /* Peer rej'd our CI */
+static int lcp_reqci(fsm *, u_char *, int *, int); /* Rcv peer CI */
+static void lcp_up(fsm *); /* We're UP */
+static void lcp_down(fsm *); /* We're DOWN */
+static void lcp_starting(fsm *); /* We need lower layer up */
+static void lcp_finished(fsm *); /* We need lower layer down */
+static int lcp_extcode(fsm *, int, int, u_char *, int);
+static void lcp_rprotrej(fsm *, u_char *, int);
/*
* routines to send LCP echos to peer
*/
-static void lcp_echo_lowerup __P((int));
-static void lcp_echo_lowerdown __P((int));
-static void LcpEchoTimeout __P((void *));
-static void lcp_received_echo_reply __P((fsm *, int, u_char *, int));
-static void LcpSendEchoRequest __P((fsm *));
-static void LcpLinkFailure __P((fsm *));
-static void LcpEchoCheck __P((fsm *));
+static void lcp_echo_lowerup(int);
+static void lcp_echo_lowerdown(int);
+static void LcpEchoTimeout(void *);
+static void lcp_received_echo_reply(fsm *, int, u_char *, int);
+static void LcpSendEchoRequest(fsm *);
+static void LcpLinkFailure(fsm *);
+static void LcpEchoCheck(fsm *);
static fsm_callbacks lcp_callbacks = { /* LCP callback routines */
lcp_resetci, /* Reset our Configuration Information */
* Some of these are called directly.
*/
-static void lcp_init __P((int));
-static void lcp_input __P((int, u_char *, int));
-static void lcp_protrej __P((int));
-static int lcp_printpkt __P((u_char *, int,
- void (*) __P((void *, char *, ...)), void *));
+static void lcp_init(int);
+static void lcp_input(int, u_char *, int);
+static void lcp_protrej(int);
+static int lcp_printpkt(u_char *, int, void (*)(void *, char *, ...), void *);
struct protent lcp_protent = {
PPP_LCP,
* noopt - Disable all options (why?).
*/
static int
-noopt(argv)
- char **argv;
+noopt(char **argv)
{
BZERO((char *) &lcp_wantoptions[0], sizeof (struct lcp_options));
BZERO((char *) &lcp_allowoptions[0], sizeof (struct lcp_options));
return (1);
}
-#ifdef HAVE_MULTILINK
+#ifdef PPP_WITH_MULTILINK
static int
-setendpoint(argv)
- char **argv;
+setendpoint(char **argv)
{
if (str_to_epdisc(&lcp_wantoptions[0].endpoint, *argv)) {
lcp_wantoptions[0].neg_endpoint = 1;
return 1;
}
- option_error("Can't parse '%s' as an endpoint discriminator", *argv);
+ ppp_option_error("Can't parse '%s' as an endpoint discriminator", *argv);
return 0;
}
static void
-printendpoint(opt, printer, arg)
- option_t *opt;
- void (*printer) __P((void *, char *, ...));
- void *arg;
+printendpoint(option_t *opt, void (*printer)(void *, char *, ...), void *arg)
{
printer(arg, "%s", epdisc_to_str(&lcp_wantoptions[0].endpoint));
}
-#endif /* HAVE_MULTILINK */
+#endif /* PPP_WITH_MULTILINK */
/*
* lcp_init - Initialize LCP.
*/
static void
-lcp_init(unit)
- int unit;
+lcp_init(int unit)
{
fsm *f = &lcp_fsm[unit];
lcp_options *wo = &lcp_wantoptions[unit];
* lcp_open - LCP is allowed to come up.
*/
void
-lcp_open(unit)
- int unit;
+lcp_open(int unit)
{
fsm *f = &lcp_fsm[unit];
lcp_options *wo = &lcp_wantoptions[unit];
* lcp_close - Take LCP down.
*/
void
-lcp_close(unit, reason)
- int unit;
- char *reason;
+lcp_close(int unit, char *reason)
{
fsm *f = &lcp_fsm[unit];
int oldstate;
- if (phase != PHASE_DEAD && phase != PHASE_MASTER)
+ if (!in_phase(PHASE_DEAD) && !in_phase(PHASE_MASTER))
new_phase(PHASE_TERMINATE);
if (f->flags & DELAYED_UP) {
- untimeout(lcp_delayed_up, f);
+ UNTIMEOUT(lcp_delayed_up, f);
f->state = STOPPED;
}
oldstate = f->state;
* lcp_lowerup - The lower layer is up.
*/
void
-lcp_lowerup(unit)
- int unit;
+lcp_lowerup(int unit)
{
lcp_options *wo = &lcp_wantoptions[unit];
fsm *f = &lcp_fsm[unit];
if (listen_time != 0) {
f->flags |= DELAYED_UP;
- timeout(lcp_delayed_up, f, 0, listen_time * 1000);
+ ppp_timeout(lcp_delayed_up, f, 0, listen_time * 1000);
} else
fsm_lowerup(f);
}
* lcp_lowerdown - The lower layer is down.
*/
void
-lcp_lowerdown(unit)
- int unit;
+lcp_lowerdown(int unit)
{
fsm *f = &lcp_fsm[unit];
if (f->flags & DELAYED_UP) {
f->flags &= ~DELAYED_UP;
- untimeout(lcp_delayed_up, f);
+ UNTIMEOUT(lcp_delayed_up, f);
} else
fsm_lowerdown(&lcp_fsm[unit]);
}
* lcp_delayed_up - Bring the lower layer up now.
*/
static void
-lcp_delayed_up(arg)
- void *arg;
+lcp_delayed_up(void *arg)
{
fsm *f = arg;
* lcp_input - Input LCP packet.
*/
static void
-lcp_input(unit, p, len)
- int unit;
- u_char *p;
- int len;
+lcp_input(int unit, u_char *p, int len)
{
fsm *f = &lcp_fsm[unit];
if (f->flags & DELAYED_UP) {
f->flags &= ~DELAYED_UP;
- untimeout(lcp_delayed_up, f);
+ UNTIMEOUT(lcp_delayed_up, f);
fsm_lowerup(f);
}
fsm_input(f, p, len);
* lcp_extcode - Handle a LCP-specific code.
*/
static int
-lcp_extcode(f, code, id, inp, len)
- fsm *f;
- int code, id;
- u_char *inp;
- int len;
+lcp_extcode(fsm *f, int code, int id, u_char *inp, int len)
{
u_char *magp;
* Figure out which protocol is rejected and inform it.
*/
static void
-lcp_rprotrej(f, inp, len)
- fsm *f;
- u_char *inp;
- int len;
+lcp_rprotrej(fsm *f, u_char *inp, int len)
{
int i;
struct protent *protp;
*/
/*ARGSUSED*/
static void
-lcp_protrej(unit)
- int unit;
+lcp_protrej(int unit)
{
/*
* Can't reject LCP!
* lcp_sprotrej - Send a Protocol-Reject for some protocol.
*/
void
-lcp_sprotrej(unit, p, len)
- int unit;
- u_char *p;
- int len;
+lcp_sprotrej(int unit, u_char *p, int len)
{
/*
* Send back the protocol and the information field of the
* lcp_resetci - Reset our CI.
*/
static void
-lcp_resetci(f)
- fsm *f;
+lcp_resetci(fsm *f)
{
lcp_options *wo = &lcp_wantoptions[f->unit];
lcp_options *go = &lcp_gotoptions[f->unit];
* lcp_cilen - Return length of our CI.
*/
static int
-lcp_cilen(f)
- fsm *f;
+lcp_cilen(fsm *f)
{
lcp_options *go = &lcp_gotoptions[f->unit];
* lcp_addci - Add our desired CIs to a packet.
*/
static void
-lcp_addci(f, ucp, lenp)
- fsm *f;
- u_char *ucp;
- int *lenp;
+lcp_addci(fsm *f, u_char *ucp, int *lenp)
{
lcp_options *go = &lcp_gotoptions[f->unit];
u_char *start_ucp = ucp;
* 1 - Ack was good.
*/
static int
-lcp_ackci(f, p, len)
- fsm *f;
- u_char *p;
- int len;
+lcp_ackci(fsm *f, u_char *p, int len)
{
lcp_options *go = &lcp_gotoptions[f->unit];
u_char cilen, citype, cichar;
* 1 - Nak was good.
*/
static int
-lcp_nakci(f, p, len, treat_as_reject)
- fsm *f;
- u_char *p;
- int len;
- int treat_as_reject;
+lcp_nakci(fsm *f, u_char *p, int len, int treat_as_reject)
{
lcp_options *go = &lcp_gotoptions[f->unit];
lcp_options *wo = &lcp_wantoptions[f->unit];
if (looped_back) {
if (++try.numloops >= lcp_loopbackfail) {
notice("Serial line is looped back.");
- status = EXIT_LOOPBACK;
+ ppp_set_status(EXIT_LOOPBACK);
lcp_close(f->unit, "Loopback detected");
}
} else
* 1 - Reject was good.
*/
static int
-lcp_rejci(f, p, len)
- fsm *f;
- u_char *p;
- int len;
+lcp_rejci(fsm *f, u_char *p, int len)
{
lcp_options *go = &lcp_gotoptions[f->unit];
u_char cichar;
* CONFNAK; returns CONFREJ if it can't return CONFACK.
*/
static int
-lcp_reqci(f, inp, lenp, reject_if_disagree)
- fsm *f;
- u_char *inp; /* Requested CIs */
- int *lenp; /* Length of requested CIs */
- int reject_if_disagree;
+lcp_reqci(fsm *f, u_char *inp, int *lenp, int reject_if_disagree)
{
lcp_options *go = &lcp_gotoptions[f->unit];
lcp_options *ho = &lcp_hisoptions[f->unit];
* lcp_up - LCP has come UP.
*/
static void
-lcp_up(f)
- fsm *f;
+lcp_up(fsm *f)
{
lcp_options *wo = &lcp_wantoptions[f->unit];
lcp_options *ho = &lcp_hisoptions[f->unit];
*/
mtu = ho->neg_mru? ho->mru: PPP_MRU;
mru = go->neg_mru? MAX(wo->mru, go->mru): PPP_MRU;
-#ifdef HAVE_MULTILINK
+#ifdef PPP_WITH_MULTILINK
if (!(multilink && go->neg_mrru && ho->neg_mrru))
-#endif /* HAVE_MULTILINK */
- netif_set_mtu(f->unit, MIN(MIN(mtu, mru), ao->mru));
+#endif /* PPP_WITH_MULTILINK */
+ ppp_set_mtu(f->unit, MIN(MIN(mtu, mru), ao->mru));
ppp_send_config(f->unit, mtu,
(ho->neg_asyncmap? ho->asyncmap: 0xffffffff),
ho->neg_pcompression, ho->neg_accompression);
* Alert other protocols.
*/
static void
-lcp_down(f)
- fsm *f;
+lcp_down(fsm *f)
{
lcp_options *go = &lcp_gotoptions[f->unit];
* lcp_starting - LCP needs the lower layer up.
*/
static void
-lcp_starting(f)
- fsm *f;
+lcp_starting(fsm *f)
{
link_required(f->unit);
}
* lcp_finished - LCP has finished with the lower layer.
*/
static void
-lcp_finished(f)
- fsm *f;
+lcp_finished(fsm *f)
{
link_terminated(f->unit);
}
};
static int
-lcp_printpkt(p, plen, printer, arg)
- u_char *p;
- int plen;
- void (*printer) __P((void *, char *, ...));
- void *arg;
+lcp_printpkt(u_char *p, int plen, void (*printer)(void *, char *, ...), void *arg)
{
int code, id, len, olen, i;
u_char *pstart, *optend;
}
break;
case CI_EPDISC:
-#ifdef HAVE_MULTILINK
+#ifdef PPP_WITH_MULTILINK
if (olen >= CILEN_CHAR) {
struct epdisc epd;
p += 2;
*/
static
-void LcpLinkFailure (f)
- fsm *f;
+void LcpLinkFailure (fsm *f)
{
if (f->state == OPENED) {
info("No response to %d echo-requests", lcp_echos_pending);
notice("Serial link appears to be disconnected.");
- status = EXIT_PEER_DEAD;
+ ppp_set_status(EXIT_PEER_DEAD);
lcp_close(f->unit, "Peer not responding");
}
}
*/
static void
-LcpEchoCheck (f)
- fsm *f;
+LcpEchoCheck (fsm *f)
{
LcpSendEchoRequest (f);
if (f->state != OPENED)
*/
static void
-LcpEchoTimeout (arg)
- void *arg;
+LcpEchoTimeout (void *arg)
{
if (lcp_echo_timer_running != 0) {
lcp_echo_timer_running = 0;
}
}
+/*
+ * Log the round-trip time (RTT) of the received LCP echo-request.
+ *
+ * The header section at the beginning of lcp_rtt_file contains
+ * LCP_RTT_HEADER_LENGTH fields, each a u_int32_t in network byte order:
+ * [0] LCP_RTT_MAGIC
+ * [1] status (1: the file is open and is being written)
+ * [2] index of the most recently updated element
+ * [3] the value of the lcp-echo-interval parameter
+ *
+ * The header is followed by a ring buffer of LCP_RTT_ELEMENTS elements, each
+ * containing a pair of u_int32_t in network byte order with this content:
+ * [0] UNIX timestamp
+ * [1] bits 24-31: the number of lost LCP echo replies
+ * bits 0-23: the measured RTT in microseconds
+ *
+ * The timestamp is unsigned to support storing dates beyond 2038.
+ *
+ * Consumers of lcp_rtt_file are expected to:
+ * - read the complete file of arbitrary length
+ * - check the magic number
+ * - process the data elements starting at the index
+ * - ignore any elements with a timestamp of 0
+ */
+static void
+lcp_rtt_update_buffer (unsigned long rtt)
+{
+ volatile u_int32_t *const ring_header = lcp_rtt_buffer;
+ volatile u_int32_t *const ring_buffer = lcp_rtt_buffer
+ + LCP_RTT_HEADER_LENGTH;
+ unsigned int next_entry, lost;
+
+ /* choose the next entry where the data will be stored */
+ if (ntohl(ring_header[2]) >= (LCP_RTT_ELEMENTS - 1) * 2)
+ next_entry = 0; /* go back to the beginning */
+ else
+ next_entry = ntohl(ring_header[2]) + 2; /* use the next one */
+
+ /* update the data element */
+ /* storing the timestamp in an *unsigned* long allows dates up to 2106 */
+ ring_buffer[next_entry] = htonl((u_int32_t) time(NULL));
+ lost = lcp_echos_pending - 1;
+ if (lost > 0xFF)
+ lost = 0xFF; /* truncate the lost packets count to 256 */
+ if (rtt > 0xFFFFFF)
+ rtt = 0xFFFFFF; /* truncate the RTT to 16777216 */
+ /* use bits 24-31 for the lost packets count and bits 0-23 for the RTT */
+ ring_buffer[next_entry + 1] = htonl((u_int32_t) ((lost << 24) + rtt));
+
+ /* update the pointer to the (just updated) most current data element */
+ ring_header[2] = htonl(next_entry);
+
+ /* In theory, CPUs implementing a weakly-consistent memory model do not
+ * guarantee that these three memory store operations to the buffer will
+ * be seen in the same order by the reader process.
+ * This means that a process reading the file could see the index
+ * having been updated before the element that the index points to had
+ * been written.
+ * But in practice we expect that the read(2) system call used by
+ * consumers processes is atomic with respect to the following msync(2)
+ * call, so we ignore the issue.
+ */
+
+ if (msync(lcp_rtt_buffer, LCP_RTT_FILE_SIZE, MS_ASYNC) < 0)
+ error("msync() for %s failed: %m", lcp_rtt_file);
+}
+
/*
* LcpEchoReply - LCP has received a reply to the echo
*/
static void
-lcp_received_echo_reply (f, id, inp, len)
- fsm *f;
- int id;
- u_char *inp;
- int len;
+lcp_received_echo_reply (fsm *f, int id, u_char *inp, int len)
{
u_int32_t magic;
return;
}
+ if (lcp_rtt_file_fd && len >= 16) {
+ long lcp_rtt_magic;
+
+ /*
+ * If the magic word is found at the beginning of the data section
+ * of the frame then read the timestamp which follows and subtract
+ * it from the current time to compute the round trip time.
+ */
+ GETLONG(lcp_rtt_magic, inp);
+ if (lcp_rtt_magic == LCP_RTT_MAGIC) {
+ struct timespec ts;
+ unsigned long req_sec, req_nsec, rtt;
+
+ clock_gettime(CLOCK_MONOTONIC, &ts);
+ GETLONG(req_sec, inp);
+ GETLONG(req_nsec, inp);
+ /* compute the RTT in microseconds */
+ rtt = (ts.tv_sec - req_sec) * 1000000
+ + (ts.tv_nsec / 1000 - req_nsec / 1000);
+ /* log the RTT */
+ lcp_rtt_update_buffer(rtt);
+ }
+ }
+
/* Reset the number of outstanding echo frames */
lcp_echos_pending = 0;
}
*/
static void
-LcpSendEchoRequest (f)
- fsm *f;
+LcpSendEchoRequest (fsm *f)
{
u_int32_t lcp_magic;
- u_char pkt[4], *pktp;
+ u_char pkt[16], *pktp;
/*
* Detect the failure of the peer at this point.
}
}
+ /*
+ * If adaptive echos have been enabled, only send the echo request if
+ * no traffic was received since the last one.
+ */
+ if (lcp_echo_adaptive) {
+ static unsigned int last_pkts_in = 0;
+ struct pppd_stats cur_stats;
+
+ if (get_ppp_stats(f->unit, &cur_stats) && cur_stats.pkts_in != last_pkts_in) {
+ last_pkts_in = cur_stats.pkts_in;
+ /* receipt of traffic indicates the link is working... */
+ lcp_echos_pending = 0;
+ return;
+ }
+ }
+
/*
* Make and send the echo request frame.
*/
lcp_magic = lcp_gotoptions[f->unit].magicnumber;
pktp = pkt;
PUTLONG(lcp_magic, pktp);
+
+ /* Put a timestamp in the data section of the frame */
+ if (lcp_rtt_file_fd) {
+ struct timespec ts;
+
+ PUTLONG(LCP_RTT_MAGIC, pktp);
+ clock_gettime(CLOCK_MONOTONIC, &ts);
+ PUTLONG((u_int32_t)ts.tv_sec, pktp);
+ PUTLONG((u_int32_t)ts.tv_nsec, pktp);
+ }
+
fsm_sdata(f, ECHOREQ, lcp_echo_number++ & 0xFF, pkt, pktp - pkt);
++lcp_echos_pending;
}
}
+static void
+lcp_rtt_open_file (void)
+{
+ volatile u_int32_t *ring_header;
+
+ if (!lcp_rtt_file)
+ return;
+
+ lcp_rtt_file_fd = open(lcp_rtt_file, O_RDWR | O_CREAT, 0644);
+ if (lcp_rtt_file_fd < 0) {
+ error("Can't open the RTT log file %s: %m", lcp_rtt_file);
+ lcp_rtt_file_fd = 0;
+ return;
+ }
+
+ if (ftruncate(lcp_rtt_file_fd, LCP_RTT_FILE_SIZE) < 0)
+ fatal("ftruncate() of %s failed: %m", lcp_rtt_file);
+ lcp_rtt_buffer = mmap(0, LCP_RTT_FILE_SIZE, PROT_READ | PROT_WRITE,
+ MAP_SHARED, lcp_rtt_file_fd, 0);
+ if (lcp_rtt_buffer == MAP_FAILED)
+ fatal("mmap() of %s failed: %m", lcp_rtt_file);
+ ring_header = lcp_rtt_buffer;
+
+ /* initialize the ring buffer */
+ if (ring_header[0] != htonl(LCP_RTT_MAGIC)) {
+ memset(lcp_rtt_buffer, 0, LCP_RTT_FILE_SIZE);
+ ring_header[0] = htonl(LCP_RTT_MAGIC);
+ }
+
+ ring_header[3] = htonl(lcp_echo_interval);
+ ring_header[1] = htonl(1); /* status: LCP up, file opened */
+}
+
+static void
+lcp_rtt_close_file (void)
+{
+ volatile u_int32_t *const ring_header = lcp_rtt_buffer;
+
+ if (!lcp_rtt_file_fd)
+ return;
+
+ ring_header[1] = htonl(0); /* status: LCP down, file closed */
+
+ if (munmap(lcp_rtt_buffer, LCP_RTT_FILE_SIZE) < 0)
+ error("munmap() of %s failed: %m", lcp_rtt_file);
+ if (close(lcp_rtt_file_fd) < 0)
+ error("close() of %s failed: %m", lcp_rtt_file);
+ lcp_rtt_buffer = NULL;
+ lcp_rtt_file_fd = 0;
+}
+
/*
* lcp_echo_lowerup - Start the timer for the LCP frame
*/
static void
-lcp_echo_lowerup (unit)
- int unit;
+lcp_echo_lowerup (int unit)
{
fsm *f = &lcp_fsm[unit];
lcp_echos_pending = 0;
lcp_echo_number = 0;
lcp_echo_timer_running = 0;
+
+ /* Open the file where the LCP RTT data will be logged */
+ lcp_rtt_open_file();
/* If a timeout interval is specified then start the timer */
if (lcp_echo_interval != 0)
*/
static void
-lcp_echo_lowerdown (unit)
- int unit;
+lcp_echo_lowerdown (int unit)
{
fsm *f = &lcp_fsm[unit];
UNTIMEOUT (LcpEchoTimeout, f);
lcp_echo_timer_running = 0;
}
+
+ /* Close the file containing the LCP RTT data */
+ lcp_rtt_close_file();
}
projects / ppp.git / blobdiff