// L2TPNS PPP Stuff
-char const *cvs_id_ppp = "$Id: ppp.c,v 1.74 2005-08-17 03:56:27 bodea Exp $";
+//#define LAC
#include <stdio.h>
#include <string.h>
#include "tbf.h"
#include "cluster.h"
+#ifdef LAC
+#include "l2tplac.h"
+#endif
+
extern tunnelt *tunnel;
+extern bundlet *bundle;
+extern fragmentationt *frag;
extern sessiont *session;
extern radiust *radius;
extern int tunfd;
extern char hostname[];
extern uint32_t eth_tx;
extern time_t time_now;
+extern uint64_t time_now_ms;
extern configt *config;
static int add_lcp_auth(uint8_t *b, int size, int authtype);
+static bundleidt new_bundle(void);
+static int epdiscmp(epdist, epdist);
+static void setepdis(epdist *, epdist);
+static void ipcp_open(sessionidt s, tunnelidt t);
+
+static int first_session_in_bundle(sessionidt s)
+{
+ bundleidt i;
+ for (i = 1; i < MAXBUNDLE; i++)
+ if (bundle[i].state != BUNDLEFREE)
+ if (epdiscmp(session[s].epdis,bundle[i].epdis) && !strcmp(session[s].user, bundle[i].user))
+ return 0;
+ return 1;
+}
// Process PAP messages
void processpap(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l)
{
LOG(1, s, t, "Short PAP %u bytes\n", l);
STAT(tunnel_rx_errors);
- sessionshutdown(s, "Short PAP packet.", 3, 0);
+ sessionshutdown(s, "Short PAP packet.", CDN_ADMIN_DISC, TERM_USER_ERROR);
return;
}
{
LOG(1, s, t, "Length mismatch PAP %u/%u\n", hl, l);
STAT(tunnel_rx_errors);
- sessionshutdown(s, "PAP length mismatch.", 3, 0);
+ sessionshutdown(s, "PAP length mismatch.", CDN_ADMIN_DISC, TERM_USER_ERROR);
return;
}
l = hl;
{
LOG(1, s, t, "Unexpected PAP code %d\n", *p);
STAT(tunnel_rx_errors);
- sessionshutdown(s, "Unexpected PAP code.", 3, 0);
+ sessionshutdown(s, "Unexpected PAP code.", CDN_ADMIN_DISC, TERM_USER_ERROR);
return;
}
LOG(3, s, t, "PAP login %s/%s\n", user, pass);
}
+#ifdef LAC
+ if (forwardtolns(s, user))
+ {
+ LOG(3, s, t, "Forwarding login for %s to other LNS\n", user);
+ return;
+ }
+#endif
+
if (session[s].ip || !(r = radiusnew(s)))
{
// respond now, either no RADIUS available or already authenticated
- uint8_t b[MAXCONTROL];
+ uint8_t b[MAXETHER];
uint8_t id = p[1];
- uint8_t *p = makeppp(b, sizeof(b), 0, 0, s, t, PPPPAP);
+ uint8_t *p = makeppp(b, sizeof(b), 0, 0, s, t, PPPPAP, 0, 0, 0);
if (!p) return;
if (session[s].ip)
else
{
LOG(1, s, t, "No RADIUS session available to authenticate session...\n");
- sessionshutdown(s, "No free RADIUS sessions.", 4, 0);
+ sessionshutdown(s, "No free RADIUS sessions.", CDN_UNAVAILABLE, TERM_SERVICE_UNAVAILABLE);
}
}
else
radius[r].id = p[1];
LOG(3, s, t, "Sending login for %s/%s to RADIUS\n", user, pass);
- radiussend(r, RADIUSAUTH);
+ if ((session[s].mrru) && (!first_session_in_bundle(s)))
+ radiussend(r, RADIUSJUSTAUTH);
+ else
+ radiussend(r, RADIUSAUTH);
}
}
CSTAT(processchap);
LOG_HEX(5, "CHAP", p, l);
- r = sess_local[s].radius;
- if (!r)
- {
- LOG(1, s, t, "Unexpected CHAP message\n");
- STAT(tunnel_rx_errors);
- return;
- }
if (l < 4)
{
LOG(1, s, t, "Short CHAP %u bytes\n", l);
STAT(tunnel_rx_errors);
- sessionshutdown(s, "Short CHAP packet.", 3, 0);
+ sessionshutdown(s, "Short CHAP packet.", CDN_ADMIN_DISC, TERM_USER_ERROR);
return;
}
{
LOG(1, s, t, "Length mismatch CHAP %u/%u\n", hl, l);
STAT(tunnel_rx_errors);
- sessionshutdown(s, "CHAP length mismatch.", 3, 0);
+ sessionshutdown(s, "CHAP length mismatch.", CDN_ADMIN_DISC, TERM_USER_ERROR);
return;
}
l = hl;
{
LOG(1, s, t, "Unexpected CHAP response code %d\n", *p);
STAT(tunnel_rx_errors);
- sessionshutdown(s, "CHAP length mismatch.", 3, 0);
+ sessionshutdown(s, "CHAP length mismatch.", CDN_ADMIN_DISC, TERM_USER_ERROR);
return;
}
return;
}
+ r = sess_local[s].radius;
+ if (!r)
+ {
+ LOG(3, s, t, "Unexpected CHAP message\n");
+
+ // Some modems (Netgear DM602, possibly others) persist in using CHAP even
+ // after ACKing our ConfigReq for PAP.
+ if (sess_local[s].lcp_authtype == AUTHPAP && config->radius_authtypes & AUTHCHAP)
+ {
+ sess_local[s].lcp_authtype = AUTHCHAP;
+ sendchap(s, t);
+ }
+ return;
+ }
+
if (p[1] != radius[r].id)
{
LOG(1, s, t, "Wrong CHAP response ID %d (should be %d) (%d)\n", p[1], radius[r].id, r);
STAT(tunnel_rx_errors);
- sessionshutdown(s, "Unexpected CHAP response ID.", 3, 0);
+ sessionshutdown(s, "Unexpected CHAP response ID.", CDN_ADMIN_DISC, TERM_USER_ERROR);
return;
}
{
LOG(1, s, t, "Bad CHAP response length %d\n", l < 5 ? -1 : p[4]);
STAT(tunnel_rx_errors);
- sessionshutdown(s, "Bad CHAP response length.", 3, 0);
+ sessionshutdown(s, "Bad CHAP response length.", CDN_ADMIN_DISC, TERM_USER_ERROR);
return;
}
{
LOG(1, s, t, "CHAP user too long %d\n", l - 16);
STAT(tunnel_rx_errors);
- sessionshutdown(s, "CHAP username too long.", 3, 0);
+ sessionshutdown(s, "CHAP username too long.", CDN_ADMIN_DISC, TERM_USER_ERROR);
return;
}
packet.username = calloc(l + 1, 1);
memcpy(packet.username, p, l);
+#ifdef LAC
+ if (forwardtolns(s, packet.username))
+ {
+ LOG(3, s, t, "Forwarding login for %s to other LNS\n", packet.username);
+
+ free(packet.username);
+ free(packet.password);
+ return;
+ }
+#endif
+
run_plugins(PLUGIN_PRE_AUTH, &packet);
if (!packet.continue_auth)
{
radius[r].chap = 1;
LOG(3, s, t, "CHAP login %s\n", session[s].user);
- radiussend(r, RADIUSAUTH);
+ if ((session[s].mrru) && (!first_session_in_bundle(s)))
+ radiussend(r, RADIUSJUSTAUTH);
+ else
+ radiussend(r, RADIUSAUTH);
}
static void dumplcp(uint8_t *p, int l)
else if (length == 5)
{
int proto = ntohs(*(uint16_t *)(o + 2));
- int algo = *(uint8_t *)(o + 4);
+ int algo = *(o + 4);
LOG(4, 0, 0, " %s 0x%x 0x%x (%s)\n", ppp_lcp_option(type), proto, algo,
(proto == PPPCHAP && algo == 5) ? "CHAP MD5" : "UNSUPPORTED");
}
}
else
{
- // This-Layer-Up
- sendipcp(s, t);
- change_state(s, ipcp, RequestSent);
- // move to passive state for IPv6 (if configured), CCP
- if (config->ipv6_prefix.s6_addr[0])
- change_state(s, ipv6cp, Stopped);
- else
- change_state(s, ipv6cp, Closed);
+ if(session[s].bundle == 0 || bundle[session[s].bundle].num_of_links == 1)
+ {
+ // This-Layer-Up
+ sendipcp(s, t);
+ change_state(s, ipcp, RequestSent);
+ // move to passive state for IPv6 (if configured), CCP
+ if (config->ipv6_prefix.s6_addr[0])
+ change_state(s, ipv6cp, Stopped);
+ else
+ change_state(s, ipv6cp, Closed);
- change_state(s, ccp, Stopped);
+ change_state(s, ccp, Stopped);
+ }
+ else
+ {
+ sessionidt first_ses = bundle[session[s].bundle].members[0];
+ LOG(3, s, t, "MPPP: Skipping IPCP negotiation for session:%d, first session of bundle is:%d\n",s,first_ses);
+ ipcp_open(s, t);
+ }
}
}
change_state(s, ccp, Dead);
}
-static uint8_t *ppp_rej(sessionidt s, uint8_t *buf, size_t blen, uint16_t mtype,
+static uint8_t *ppp_conf_rej(sessionidt s, uint8_t *buf, size_t blen, uint16_t mtype,
uint8_t **response, uint8_t *queued, uint8_t *packet, uint8_t *option)
{
if (!*response || **response != ConfigRej)
{
- queued = *response = makeppp(buf, blen, packet, 2, s, session[s].tunnel, mtype);
+ queued = *response = makeppp(buf, blen, packet, 2, s, session[s].tunnel, mtype, 0, 0, 0);
if (!queued)
return 0;
return queued + option[1];
}
-static uint8_t *ppp_nak(sessionidt s, uint8_t *buf, size_t blen, uint16_t mtype,
+static uint8_t *ppp_conf_nak(sessionidt s, uint8_t *buf, size_t blen, uint16_t mtype,
uint8_t **response, uint8_t *queued, uint8_t *packet, uint8_t *option,
uint8_t *value, size_t vlen)
{
if (*nak_sent < config->ppp_max_failure) // reject queued
return queued;
- return ppp_rej(s, buf, blen, mtype, response, 0, packet, option);
+ return ppp_conf_rej(s, buf, blen, mtype, response, 0, packet, option);
}
if (!*response)
{
if (*nak_sent >= config->ppp_max_failure)
- return ppp_rej(s, buf, blen, mtype, response, 0, packet, option);
+ return ppp_conf_rej(s, buf, blen, mtype, response, 0, packet, option);
- queued = *response = makeppp(buf, blen, packet, 2, s, session[s].tunnel, mtype);
+ queued = *response = makeppp(buf, blen, packet, 2, s, session[s].tunnel, mtype, 0, 0, 0);
if (!queued)
return 0;
return queued + vlen;
}
+static void ppp_code_rej(sessionidt s, tunnelidt t, uint16_t proto,
+ char *pname, uint8_t *p, uint16_t l, uint8_t *buf, size_t size)
+{
+ uint8_t *q;
+ int mru = session[s].mru;
+ if (mru < MINMTU) mru = MINMTU;
+ if (mru > size) mru = size;
+
+ l += 4;
+ if (l > mru) l = mru;
+
+ q = makeppp(buf, size, 0, 0, s, t, proto, 0, 0, 0);
+ if (!q) return;
+
+ *q = CodeRej;
+ *(q + 1) = ++sess_local[s].lcp_ident;
+ *(uint16_t *)(q + 2) = htons(l);
+ memcpy(q + 4, p, l - 4);
+
+ LOG(2, s, t, "Unexpected %s code %s\n", pname, ppp_code(*p));
+ LOG(3, s, t, "%s: send %s\n", pname, ppp_code(*q));
+ if (config->debug > 3) dumplcp(q, l);
+
+ tunnelsend(buf, l + (q - buf), t);
+}
+
// Process LCP messages
void processlcp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l)
{
- uint8_t b[MAXCONTROL];
+ uint8_t b[MAXETHER];
uint8_t *q = NULL;
- uint32_t magicno = 0;
uint16_t hl;
CSTAT(processlcp);
if (session[s].die) // going down...
return;
- LOG(*p == EchoReq ? 4 : 3, s, t, "LCP: recv %s\n", ppp_code(*p));
+ LOG((*p == EchoReq || *p == EchoReply) ? 4 : 3, s, t,
+ "LCP: recv %s\n", ppp_code(*p));
+
if (config->debug > 3) dumplcp(p, l);
if (*p == ConfigAck)
if (session[s].ppp.lcp == Opened)
lcp_restart(s);
- sendlcp(s, t, sess_local[s].lcp_authtype);
+ sendlcp(s, t);
change_state(s, lcp, RequestSent);
break;
uint8_t *response = 0;
static uint8_t asyncmap[4] = { 0, 0, 0, 0 }; // all zero
static uint8_t authproto[5];
+ int changed = 0;
while (x > 2)
{
switch (type)
{
case 1: // Maximum-Receive-Unit
- session[s].mru = ntohs(*(uint16_t *)(o + 2));
+ {
+ uint16_t mru = ntohs(*(uint16_t *)(o + 2));
+ if (mru >= MINMTU)
+ {
+ session[s].mru = mru;
+ changed++;
+ break;
+ }
+
+ LOG(3, s, t, " Remote requesting MRU of %u. Rejecting.\n", mru);
+ mru = htons(MRU);
+ q = ppp_conf_nak(s, b, sizeof(b), PPPLCP, &response, q, p, o, (uint8_t *) &mru, sizeof(mru));
+ }
break;
case 2: // Async-Control-Character-Map
break;
LOG(3, s, t, " Remote requesting asyncmap. Rejecting.\n");
- q = ppp_nak(s, b, sizeof(b), PPPLCP, &response, q, p, o, asyncmap, sizeof(asyncmap));
+ q = ppp_conf_nak(s, b, sizeof(b), PPPLCP, &response, q, p, o, asyncmap, sizeof(asyncmap));
break;
case 3: // Authentication-Protocol
alen = add_lcp_auth(authproto, sizeof(authproto), config->radius_authprefer);
if (alen < 2) break; // paranoia
- q = ppp_nak(s, b, sizeof(b), PPPLCP, &response, q, p, o, authproto + 2, alen - 2);
+ q = ppp_conf_nak(s, b, sizeof(b), PPPLCP, &response, q, p, o, authproto + 2, alen - 2);
if (q && *response == ConfigNak &&
config->radius_authtypes != config->radius_authprefer)
{
// alternate type
alen = add_lcp_auth(authproto, sizeof(authproto), config->radius_authtypes & ~config->radius_authprefer);
if (alen < 2) break;
- q = ppp_nak(s, b, sizeof(b), PPPLCP, &response, q, p, o, authproto + 2, alen - 2);
+ q = ppp_conf_nak(s, b, sizeof(b), PPPLCP, &response, q, p, o, authproto + 2, alen - 2);
}
break;
}
break;
- case 5: // Magic-Number
- magicno = ntohl(*(uint32_t *)(o + 2));
- break;
-
case 4: // Quality-Protocol
+ case 5: // Magic-Number
case 7: // Protocol-Field-Compression
case 8: // Address-And-Control-Field-Compression
break;
+ case 17: // Multilink Max-Receive-Reconstructed-Unit
+ {
+ uint16_t mrru = ntohs(*(uint16_t *)(o + 2));
+ session[s].mrru = mrru;
+ changed++;
+ LOG(3, s, t, " Received PPP LCP option MRRU: %d\n",mrru);
+ }
+ break;
+
+ case 18: // Multilink Short Sequence Number Header Format
+ {
+ session[s].mssf = 1;
+ changed++;
+ LOG(3, s, t, " Received PPP LCP option MSSN format\n");
+ }
+ break;
+
+ case 19: // Multilink Endpoint Discriminator
+ {
+ uint8_t epdis_class = o[2];
+ int addr;
+
+ session[s].epdis.addr_class = epdis_class;
+ session[s].epdis.length = length - 3;
+ if (session[s].epdis.length > 20)
+ {
+ LOG(1, s, t, "Error: received EndDis Address Length more than 20: %d\n", session[s].epdis.length);
+ session[s].epdis.length = 20;
+ }
+
+ for (addr = 0; addr < session[s].epdis.length; addr++)
+ session[s].epdis.address[addr] = o[3+addr];
+
+ changed++;
+
+ switch (epdis_class)
+ {
+ case LOCALADDR:
+ LOG(3, s, t, " Received PPP LCP option Multilink EndDis Local Address Class: %d\n",epdis_class);
+ break;
+ case IPADDR:
+ LOG(3, s, t, " Received PPP LCP option Multilink EndDis IP Address Class: %d\n",epdis_class);
+ break;
+ case IEEEMACADDR:
+ LOG(3, s, t, " Received PPP LCP option Multilink EndDis IEEE MAC Address Class: %d\n",epdis_class);
+ break;
+ case PPPMAGIC:
+ LOG(3, s, t, " Received PPP LCP option Multilink EndDis PPP Magic No Class: %d\n",epdis_class);
+ break;
+ case PSNDN:
+ LOG(3, s, t, " Received PPP LCP option Multilink EndDis PSND No Class: %d\n",epdis_class);
+ break;
+ default:
+ LOG(3, s, t, " Received PPP LCP option Multilink EndDis NULL Class %d\n",epdis_class);
+ }
+ }
+ break;
+
default: // Reject any unknown options
LOG(3, s, t, " Rejecting unknown PPP LCP option %d\n", type);
- q = ppp_rej(s, b, sizeof(b), PPPLCP, &response, q, p, o);
+ q = ppp_conf_rej(s, b, sizeof(b), PPPLCP, &response, q, p, o);
}
x -= length;
o += length;
}
+ if (changed)
+ cluster_send_session(s);
+
if (response)
{
l = q - response; // LCP packet length
else
{
// Send packet back as ConfigAck
- response = makeppp(b, sizeof(b), p, l, s, t, PPPLCP);
+ response = makeppp(b, sizeof(b), p, l, s, t, PPPLCP, 0, 0, 0);
if (!response) return;
*response = ConfigAck;
}
switch (session[s].ppp.lcp)
{
case Closed:
- response = makeppp(b, sizeof(b), p, 2, s, t, PPPLCP);
+ response = makeppp(b, sizeof(b), p, 2, s, t, PPPLCP, 0, 0, 0);
if (!response) return;
*response = TerminateAck;
*((uint16_t *) (response + 2)) = htons(l = 4);
case Stopped:
initialise_restart_count(s, lcp);
- sendlcp(s, t, sess_local[s].lcp_authtype);
+ sendlcp(s, t);
if (*response == ConfigAck)
change_state(s, lcp, AckSent);
else
case Opened:
lcp_restart(s);
- sendlcp(s, t, sess_local[s].lcp_authtype);
+ sendlcp(s, t);
/* fallthrough */
case AckSent:
break;
+ case Closing:
+ sessionshutdown(s, "LCP: ConfigReq in state Closing. This should not happen. Killing session.", CDN_ADMIN_DISC, TERM_LOST_SERVICE);
+ break;
+
default:
LOG(2, s, t, "LCP: ignoring %s in state %s\n", ppp_code(*p), ppp_state(session[s].ppp.lcp));
return;
tunnelsend(b, l + (response - b), t);
}
- else if (*p == ConfigNak)
+ else if (*p == ConfigNak || *p == ConfigRej)
{
int x = l - 4;
uint8_t *o = (p + 4);
switch (type)
{
case 1: // Maximum-Receive-Unit
- session[s].mru = ntohs(*(uint16_t *)(o + 2));
- LOG(3, s, t, " Remote requested MRU of %u\n", session[s].mru);
+ if (*p == ConfigNak)
+ {
+ if (length < 4) break;
+ sess_local[s].ppp_mru = ntohs(*(uint16_t *)(o + 2));
+ LOG(3, s, t, " Remote requested MRU of %u\n", sess_local[s].ppp_mru);
+ }
+ else
+ {
+ sess_local[s].ppp_mru = 0;
+ LOG(3, s, t, " Remote rejected MRU negotiation\n");
+ }
+
break;
case 3: // Authentication-Protocol
if (authtype > 0)
break;
+ if (*p == ConfigNak)
{
- int proto = ntohs(*(uint16_t *)(o + 2));
+ int proto;
+
+ if (length < 4) break;
+ proto = ntohs(*(uint16_t *)(o + 2));
+
if (proto == PPPPAP)
{
authtype = config->radius_authtypes & AUTHPAP;
LOG(3, s, t, " Remote requested PAP authentication...%sing\n",
authtype ? "accept" : "reject");
}
- else if (proto == PPPCHAP && *(o + 4) == 5)
+ else if (proto == PPPCHAP && length > 4 && *(o + 4) == 5)
{
authtype = config->radius_authtypes & AUTHCHAP;
LOG(3, s, t, " Remote requested CHAP authentication...%sing\n",
proto);
}
}
+ else
+ {
+ LOG(2, s, t, "LCP: remote rejected auth negotiation\n");
+ authtype = 0; // shutdown
+ }
break;
- default:
- LOG(2, s, t, " Remote NAKed LCP type %u?\n", type);
+ case 5: // Magic-Number
+ session[s].magic = 0;
+ if (*p == ConfigNak)
+ {
+ if (length < 6) break;
+ session[s].magic = ntohl(*(uint32_t *)(o + 2));
+ }
+
+ if (session[s].magic)
+ LOG(3, s, t, " Remote requested magic-no %x\n", session[s].magic);
+ else
+ LOG(3, s, t, " Remote rejected magic-no\n");
+
+ cluster_send_session(s);
break;
+
+ case 17: // Multilink Max-Receive-Reconstructed-Unit
+ {
+ if (*p == ConfigNak)
+ {
+ sess_local[s].mp_mrru = ntohs(*(uint16_t *)(o + 2));
+ LOG(3, s, t, " Remote requested MRRU of %u\n", sess_local[s].mp_mrru);
+ }
+ else
+ {
+ sess_local[s].mp_mrru = 0;
+ LOG(3, s, t, " Remote rejected MRRU negotiation\n");
+ }
+ }
+ break;
+
+ case 18: // Multilink Short Sequence Number Header Format
+ {
+ if (*p == ConfigNak)
+ {
+ sess_local[s].mp_mssf = 0;
+ LOG(3, s, t, " Remote requested Naked mssf\n");
+ }
+ else
+ {
+ sess_local[s].mp_mssf = 0;
+ LOG(3, s, t, " Remote rejected mssf\n");
+ }
+ }
+ break;
+
+ case 19: // Multilink Endpoint Discriminator
+ {
+ if (*p == ConfigNak)
+ {
+ LOG(2, s, t, " Remote should not configNak Endpoint Dis!\n");
+ }
+ else
+ {
+ sess_local[s].mp_epdis = 0;
+ LOG(3, s, t, " Remote rejected Endpoint Discriminator\n");
+ }
+ }
+ break;
+
+ default:
+ LOG(2, s, t, "LCP: remote sent %s for type %u?\n", ppp_code(*p), type);
+ sessionshutdown(s, "Unable to negotiate LCP.", CDN_ADMIN_DISC, TERM_USER_ERROR);
+ return;
}
x -= length;
o += length;
if (!authtype)
{
- sessionshutdown(s, "Unsupported authentication.", 3, 0);
+ sessionshutdown(s, "Unsupported authentication.", CDN_ADMIN_DISC, TERM_USER_ERROR);
return;
}
case Closed:
case Stopped:
{
- uint8_t *response = makeppp(b, sizeof(b), p, 2, s, t, PPPLCP);
+ uint8_t *response = makeppp(b, sizeof(b), p, 2, s, t, PPPLCP, 0, 0, 0);
if (!response) return;
*response = TerminateAck;
*((uint16_t *) (response + 2)) = htons(l = 4);
case RequestSent:
case AckSent:
initialise_restart_count(s, lcp);
- sendlcp(s, t, sess_local[s].lcp_authtype);
+ sendlcp(s, t);
break;
case AckReceived:
LOG(2, s, t, "LCP: ConfigNak in state %s? Sending ConfigReq\n", ppp_state(session[s].ppp.lcp));
- sendlcp(s, t, sess_local[s].lcp_authtype);
+ sendlcp(s, t);
break;
case Opened:
lcp_restart(s);
- sendlcp(s, t, sess_local[s].lcp_authtype);
+ sendlcp(s, t);
break;
default:
}
else if (*p == TerminateReq)
{
- *p = TerminateAck; // close
- q = makeppp(b, sizeof(b), p, l, s, t, PPPLCP);
+ switch (session[s].ppp.lcp)
+ {
+ case Closed:
+ case Stopped:
+ case Closing:
+ case Stopping:
+ case RequestSent:
+ case AckReceived:
+ case AckSent:
+ break;
+
+ case Opened:
+ lcp_restart(s);
+ zero_restart_count(s, lcp);
+ change_state(s, lcp, Closing);
+ break;
+
+ default:
+ LOG(2, s, t, "LCP: ignoring %s in state %s\n", ppp_code(*p), ppp_state(session[s].ppp.lcp));
+ return;
+ }
+
+ *p = TerminateAck; // send ack
+ q = makeppp(b, sizeof(b), p, l, s, t, PPPLCP, 0, 0, 0);
if (!q) return;
LOG(3, s, t, "LCP: send %s\n", ppp_code(*q));
if (config->debug > 3) dumplcp(q, l);
tunnelsend(b, l + (q - b), t); // send it
- sessionshutdown(s, "Remote end closed connection.", 3, 0);
- }
- else if (*p == TerminateAck)
- {
- sessionshutdown(s, "Connection closed.", 3, 0);
}
else if (*p == ProtocolRej)
{
- if (*(uint16_t *) (p+4) == htons(PPPIPV6CP))
+ uint16_t proto = 0;
+
+ if (l > 4)
+ {
+ proto = *(p+4);
+ if (l > 5 && !(proto & 1))
+ {
+ proto <<= 8;
+ proto |= *(p+5);
+ }
+ }
+
+ if (proto == PPPIPV6CP)
{
LOG(3, s, t, "IPv6 rejected\n");
change_state(s, ipv6cp, Closed);
}
else
{
- LOG(1, s, t, "Unexpected LCP protocol reject 0x%X\n",
- ntohs(*(uint16_t *) (p+4)));
- STAT(tunnel_rx_errors);
+ LOG(3, s, t, "LCP protocol reject: 0x%04X\n", proto);
}
}
else if (*p == EchoReq)
{
*p = EchoReply; // reply
*(uint32_t *) (p + 4) = htonl(session[s].magic); // our magic number
- q = makeppp(b, sizeof(b), p, l, s, t, PPPLCP);
+ q = makeppp(b, sizeof(b), p, l, s, t, PPPLCP, 0, 0, 0);
if (!q) return;
LOG(4, s, t, "LCP: send %s\n", ppp_code(*q));
{
// Ignore it, last_packet time is set earlier than this.
}
- else
+ else if (*p != CodeRej)
{
- int code = *p;
- int mru = session[s].mru;
- if (!mru)
- mru = DEFAULT_MRU;
+ ppp_code_rej(s, t, PPPLCP, "LCP", p, l, b, sizeof(b));
+ }
+}
- if (l > mru) l = mru;
+int join_bundle(sessionidt s)
+{
+ // Search for a bundle to join
+ bundleidt i;
+ bundleidt b;
+ for (i = 1; i < MAXBUNDLE; i++)
+ {
+ if (bundle[i].state != BUNDLEFREE)
+ {
+ if (epdiscmp(session[s].epdis,bundle[i].epdis) && !strcmp(session[s].user, bundle[i].user))
+ {
+ sessionidt first_ses = bundle[i].members[0];
+ if (bundle[i].mssf != session[s].mssf)
+ {
+ // uniformity of sequence number format must be insured
+ LOG(3, s, session[s].tunnel, "MPPP: unable to bundle session %d in bundle %d cause of different mssf\n", s, i);
+ return -1;
+ }
+ session[s].bundle = i;
+ session[s].ip = session[first_ses].ip;
+ session[s].dns1 = session[first_ses].dns1;
+ session[s].dns2 = session[first_ses].dns2;
+ session[s].timeout = session[first_ses].timeout;
+
+ if(session[s].epdis.length > 0)
+ setepdis(&bundle[i].epdis, session[s].epdis);
+
+ strcpy(bundle[i].user, session[s].user);
+ bundle[i].members[bundle[i].num_of_links] = s;
+ bundle[i].num_of_links++;
+ LOG(3, s, session[s].tunnel, "MPPP: Bundling additional line in bundle (%d), lines:%d\n",i,bundle[i].num_of_links);
+ return i;
+ }
+ }
+ }
- *p = CodeRej;
- q = makeppp(b, sizeof(b), p, l, s, t, PPPLCP);
- if (!q) return;
+ // No previously created bundle was found for this session, so create a new one
+ if (!(b = new_bundle())) return 0;
+
+ session[s].bundle = b;
+ bundle[b].mrru = session[s].mrru;
+ bundle[b].mssf = session[s].mssf;
+ // FIXME !!! to enable l2tpns reading mssf frames receiver_max_seq, sender_max_seq must be introduce
+ // now session[s].mssf flag indecates that the receiver wish to receive frames in mssf, so max_seq (i.e. recv_max_seq) = 1<<24
+ /*
+ if (bundle[b].mssf)
+ bundle[b].max_seq = 1 << 12;
+ else */
+ bundle[b].max_seq = 1 << 24;
+ if(session[s].epdis.length > 0)
+ setepdis(&bundle[b].epdis, session[s].epdis);
+
+ strcpy(bundle[b].user, session[s].user);
+ bundle[b].members[0] = s;
+ bundle[b].timeout = session[s].timeout;
+ LOG(3, s, session[s].tunnel, "MPPP: Created a new bundle (%d)\n", b);
+ return b;
+}
- LOG(2, s, t, "Unexpected LCP code %s\n", ppp_code(code));
- LOG(3, s, t, "LCP: send %s\n", ppp_code(*q));
- if (config->debug > 3) dumplcp(q, l);
+static int epdiscmp(epdist ep1, epdist ep2)
+{
+ int ad;
+ if (ep1.length != ep2.length)
+ return 0;
- tunnelsend(b, l + (q - b), t);
- }
+ if (ep1.addr_class != ep2.addr_class)
+ return 0;
+
+ for (ad = 0; ad < ep1.length; ad++)
+ if (ep1.address[ad] != ep2.address[ad])
+ return 0;
+
+ return 1;
+}
+
+static void setepdis(epdist *ep1, epdist ep2)
+{
+ int ad;
+ ep1->length = ep2.length;
+ ep1->addr_class = ep2.addr_class;
+ for (ad = 0; ad < ep2.length; ad++)
+ ep1->address[ad] = ep2.address[ad];
+}
+
+static bundleidt new_bundle()
+{
+ bundleidt i;
+ for (i = 1; i < MAXBUNDLE; i++)
+ {
+ if (bundle[i].state == BUNDLEFREE)
+ {
+ LOG(4, 0, 0, "MPPP: Assigning bundle ID %d\n", i);
+ bundle[i].num_of_links = 1;
+ bundle[i].last_check = time_now; // Initialize last_check value
+ bundle[i].state = BUNDLEOPEN;
+ bundle[i].current_ses = -1; // This is to enforce the first session 0 to be used at first
+ memset(&frag[i], 0, sizeof(fragmentationt));
+ if (i > config->cluster_highest_bundleid)
+ config->cluster_highest_bundleid = i;
+ return i;
+ }
+ }
+ LOG(0, 0, 0, "MPPP: Can't find a free bundle! There shouldn't be this many in use!\n");
+ return 0;
}
static void ipcp_open(sessionidt s, tunnelidt t)
change_state(s, ipcp, Opened);
- if (!session[s].walled_garden)
+ if (!(session[s].walled_garden || session[s].flags & SESSION_STARTED))
{
uint16_t r = radiusnew(s);
if (r)
+ {
radiussend(r, RADIUSSTART); // send radius start
+
+ // don't send further Start records if IPCP is restarted
+ session[s].flags |= SESSION_STARTED;
+ cluster_send_session(s);
+ }
}
// start IPv6 if configured and still in passive state
// Process IPCP messages
void processipcp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l)
{
- uint8_t b[MAXCONTROL];
+ uint8_t b[MAXETHER];
uint8_t *q = 0;
uint16_t hl;
CSTAT(processipcp);
LOG_HEX(5, "IPCP", p, l);
- if (l < 5)
+ if (l < 4)
{
LOG(1, s, t, "Short IPCP %d bytes\n", l);
STAT(tunnel_rx_errors);
while (length > 2)
{
+ if (!o[1] || o[1] > length) return;
+
switch (*o)
{
case 3: // ip address
gotip++; // seen address
- if (o[1] != 6 || o[1] > length) return;
+ if (o[1] != 6) return;
addr = htonl(session[s].ip);
if (memcmp(o + 2, &addr, (sizeof addr)))
{
uint8_t *oq = q;
- q = ppp_nak(s, b, sizeof(b), PPPIPCP, &response, q, p, o, (uint8_t *) &addr, sizeof(addr));
+ q = ppp_conf_nak(s, b, sizeof(b), PPPIPCP, &response, q, p, o, (uint8_t *) &addr, sizeof(addr));
if (!q || (q != oq && *response == ConfigRej))
{
- sessionshutdown(s, "Can't negotiate IPCP.", 3, 0);
+ sessionshutdown(s, "Can't negotiate IPCP.", CDN_ADMIN_DISC, TERM_USER_ERROR);
return;
}
}
break;
case 129: // primary DNS
- if (o[1] != 6 || o[1] > length) return;
+ if (o[1] != 6) return;
addr = htonl(session[s].dns1);
if (memcmp(o + 2, &addr, (sizeof addr)))
{
- q = ppp_nak(s, b, sizeof(b), PPPIPCP, &response, q, p, o, (uint8_t *) &addr, sizeof(addr));
+ q = ppp_conf_nak(s, b, sizeof(b), PPPIPCP, &response, q, p, o, (uint8_t *) &addr, sizeof(addr));
if (!q) return;
}
break;
case 131: // secondary DNS
- if (o[1] != 6 || o[1] > length) return;
+ if (o[1] != 6) return;
- addr = htonl(session[s].dns1);
+ addr = htonl(session[s].dns2);
if (memcmp(o + 2, &addr, sizeof(addr)))
{
- q = ppp_nak(s, b, sizeof(b), PPPIPCP, &response, q, p, o, (uint8_t *) &addr, sizeof(addr));
+ q = ppp_conf_nak(s, b, sizeof(b), PPPIPCP, &response, q, p, o, (uint8_t *) &addr, sizeof(addr));
if (!q) return;
}
default:
LOG(2, s, t, " Rejecting PPP IPCP Option type %d\n", *o);
- q = ppp_rej(s, b, sizeof(b), PPPIPCP, &response, q, p, o);
+ q = ppp_conf_rej(s, b, sizeof(b), PPPIPCP, &response, q, p, o);
if (!q) return;
}
else if (gotip)
{
// Send packet back as ConfigAck
- response = makeppp(b, sizeof(b), p, l, s, t, PPPIPCP);
+ response = makeppp(b, sizeof(b), p, l, s, t, PPPIPCP, 0, 0, 0);
if (!response) return;
*response = ConfigAck;
}
switch (session[s].ppp.ipcp)
{
case Closed:
- response = makeppp(b, sizeof(b), p, 2, s, t, PPPIPCP);
+ response = makeppp(b, sizeof(b), p, 2, s, t, PPPIPCP, 0, 0, 0);
if (!response) return;
*response = TerminateAck;
*((uint16_t *) (response + 2)) = htons(l = 4);
}
else if (*p == TerminateReq)
{
- *p = TerminateAck;
- q = makeppp(b, sizeof(b), p, l, s, t, PPPIPCP);
- if (!q) return;
- LOG(3, s, t, "IPCP: send %s\n", ppp_code(*q));
- tunnelsend(b, l + (q - b), t);
- change_state(s, ipcp, Stopped);
- }
- else
- {
- int code = *p;
- int mru = session[s].mru;
- if (!mru)
- mru = DEFAULT_MRU;
+ switch (session[s].ppp.ipcp)
+ {
+ case Closed:
+ case Stopped:
+ case Closing:
+ case Stopping:
+ case RequestSent:
+ case AckReceived:
+ case AckSent:
+ break;
+
+ case Opened:
+ zero_restart_count(s, ipcp);
+ change_state(s, ipcp, Closing);
+ break;
- if (l > mru) l = mru;
+ default:
+ LOG(2, s, t, "IPCP: ignoring %s in state %s\n", ppp_code(*p), ppp_state(session[s].ppp.ipcp));
+ return;
+ }
- *p = CodeRej;
- q = makeppp(b, sizeof(b), p, l, s, t, PPPIPCP);
+ *p = TerminateAck; // send ack
+ q = makeppp(b, sizeof(b), p, l, s, t, PPPIPCP, 0, 0, 0);
if (!q) return;
- LOG(2, s, t, "Unexpected IPCP code %s\n", ppp_code(code));
LOG(3, s, t, "IPCP: send %s\n", ppp_code(*q));
- tunnelsend(b, l + (q - b), t);
+ tunnelsend(b, l + (q - b), t); // send it
+ }
+ else if (*p != CodeRej)
+ {
+ ppp_code_rej(s, t, PPPIPCP, "IPCP", p, l, b, sizeof(b));
}
}
// Process IPV6CP messages
void processipv6cp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l)
{
- uint8_t b[MAXCONTROL];
+ uint8_t b[MAXETHER];
uint8_t *q = 0;
uint16_t hl;
LOG(3, s, t, "IPV6CP: recv %s\n", ppp_code(*p));
- if (!config->ipv6_prefix.s6_addr[0])
- {
- LOG(2, s, t, "IPV6CP: %s rejected (not configured)\n", ppp_code(*p));
- *p = ProtocolRej;
- q = makeppp(b, sizeof(b), p, l, s, t, PPPIPV6CP);
- if (!q) return;
- tunnelsend(b, l + (q - b), t);
- return;
- }
-
if (!session[s].ip)
{
LOG(3, s, t, "IPV6CP: no IPv4 address (IPCP in state %s)\n", ppp_state(session[s].ppp.ipcp));
uint8_t *o = p + 4;
int length = l - 4;
int gotip = 0;
- uint8_t ident[8];
+ uint32_t ident[2];
while (length > 2)
{
+ if (!o[1] || o[1] > length) return;
+
switch (*o)
{
case 1: // interface identifier
gotip++; // seen address
- if (o[1] != 10 || o[1] > length) return;
+ if (o[1] != 10) return;
- *(uint32_t *) ident = htonl(session[s].ip);
- *(uint32_t *) (ident + 4) = 0;
+ ident[0] = htonl(session[s].ip);
+ ident[1] = 0;
if (memcmp(o + 2, ident, sizeof(ident)))
{
- q = ppp_nak(s, b, sizeof(b), PPPIPV6CP, &response, q, p, o, ident, sizeof(ident));
+ q = ppp_conf_nak(s, b, sizeof(b), PPPIPV6CP, &response, q, p, o, (uint8_t *)ident, sizeof(ident));
if (!q) return;
}
default:
LOG(2, s, t, " Rejecting PPP IPV6CP Option type %d\n", *o);
- q = ppp_rej(s, b, sizeof(b), PPPIPV6CP, &response, q, p, o);
+ q = ppp_conf_rej(s, b, sizeof(b), PPPIPV6CP, &response, q, p, o);
if (!q) return;
}
else if (gotip)
{
// Send packet back as ConfigAck
- response = makeppp(b, sizeof(b), p, l, s, t, PPPIPV6CP);
+ response = makeppp(b, sizeof(b), p, l, s, t, PPPIPV6CP, 0, 0, 0);
if (!response) return;
*response = ConfigAck;
}
switch (session[s].ppp.ipv6cp)
{
case Closed:
- response = makeppp(b, sizeof(b), p, 2, s, t, PPPIPV6CP);
+ response = makeppp(b, sizeof(b), p, 2, s, t, PPPIPV6CP, 0, 0, 0);
if (!response) return;
*response = TerminateAck;
*((uint16_t *) (response + 2)) = htons(l = 4);
}
else if (*p == TerminateReq)
{
- *p = TerminateAck;
- q = makeppp(b, sizeof(b), p, l, s, t, PPPIPV6CP);
+ switch (session[s].ppp.ipv6cp)
+ {
+ case Closed:
+ case Stopped:
+ case Closing:
+ case Stopping:
+ case RequestSent:
+ case AckReceived:
+ case AckSent:
+ break;
+
+ case Opened:
+ zero_restart_count(s, ipv6cp);
+ change_state(s, ipv6cp, Closing);
+ break;
+
+ default:
+ LOG(2, s, t, "IPV6CP: ignoring %s in state %s\n", ppp_code(*p), ppp_state(session[s].ppp.ipv6cp));
+ return;
+ }
+
+ *p = TerminateAck; // send ack
+ q = makeppp(b, sizeof(b), p, l, s, t, PPPIPV6CP, 0, 0, 0);
if (!q) return;
+
LOG(3, s, t, "IPV6CP: send %s\n", ppp_code(*q));
- tunnelsend(b, l + (q - b), t);
- change_state(s, ipv6cp, Stopped);
+ tunnelsend(b, l + (q - b), t); // send it
}
- else
+ else if (*p != CodeRej)
{
- int code = *p;
- int mru = session[s].mru;
- if (!mru)
- mru = DEFAULT_MRU;
-
- if (l > mru) l = mru;
+ ppp_code_rej(s, t, PPPIPV6CP, "IPV6CP", p, l, b, sizeof(b));
+ }
+}
- *p = CodeRej;
- q = makeppp(b, sizeof(b), p, l, s, t, PPPIPV6CP);
- if (!q) return;
+static void update_sessions_in_stat(sessionidt s, uint16_t l)
+{
+ bundleidt b = session[s].bundle;
+ if (!b)
+ {
+ increment_counter(&session[s].cin, &session[s].cin_wrap, l);
+ session[s].cin_delta += l;
+ session[s].pin++;
- LOG(2, s, t, "Unexpected IPV6CP code %s\n", ppp_code(code));
- LOG(3, s, t, "IPV6CP: send %s\n", ppp_code(*q));
- tunnelsend(b, l + (q - b), t);
+ sess_local[s].cin += l;
+ sess_local[s].pin++;
+ }
+ else
+ {
+ int i = frag[b].re_frame_begin_index;
+ int end = frag[b].re_frame_end_index;
+ for (;;)
+ {
+ l = frag[b].fragment[i].length;
+ s = frag[b].fragment[i].sid;
+ increment_counter(&session[s].cin, &session[s].cin_wrap, l);
+ session[s].cin_delta += l;
+ session[s].pin++;
+
+ sess_local[s].cin += l;
+ sess_local[s].pin++;
+ if (i == end)
+ return;
+ i = (i + 1) & MAXFRAGNUM_MASK;
+ }
}
}
LOG_HEX(5, "IP", p, l);
+ if (l < 20)
+ {
+ LOG(1, s, t, "IP packet too short %d\n", l);
+ STAT(tunnel_rx_errors);
+ return ;
+ }
+
ip = ntohl(*(uint32_t *)(p + 12));
if (l > MAXETHER)
if (session[s].ppp.phase != Network || session[s].ppp.ipcp != Opened)
return;
- // no spoof (do sessionbyip to handled statically routed subnets)
- if (ip != session[s].ip && sessionbyip(htonl(ip)) != s)
+ if (!session[s].bundle || bundle[session[s].bundle].num_of_links < 2) // FIXME:
{
- LOG(5, s, t, "Dropping packet with spoofed IP %s\n", fmtaddr(htonl(ip), 0));
- return;
+ // no spoof (do sessionbyip to handled statically routed subnets)
+ if (ip != session[s].ip && sessionbyip(htonl(ip)) != s)
+ {
+ LOG(4, s, t, "Dropping packet with spoofed IP %s\n", fmtaddr(htonl(ip), 0));
+ return;
+ }
}
// run access-list if any
if (session[s].filter_in && !ip_filter(p, l, session[s].filter_in - 1))
return;
+ // adjust MSS on SYN and SYN,ACK packets with options
+ if ((ntohs(*(uint16_t *) (p + 6)) & 0x1fff) == 0 && p[9] == IPPROTO_TCP) // first tcp fragment
+ {
+ int ihl = (p[0] & 0xf) * 4; // length of IP header
+ if (l >= ihl + 20 && (p[ihl + 13] & TCP_FLAG_SYN) && ((p[ihl + 12] >> 4) > 5))
+ adjust_tcp_mss(s, t, p, l, p + ihl);
+ }
+
// Add on the tun header
p -= 4;
*(uint32_t *) p = htonl(PKTIP);
l += 4;
- // Are we throttled and a slave?
- if (session[s].tbf_in && !config->cluster_iam_master) {
- // Pass it to the master for handling.
- master_throttle_packet(session[s].tbf_in, p, l);
- return;
- }
-
- // Are we throttled and a master??
- if (session[s].tbf_in && config->cluster_iam_master) {
- // Actually handle the throttled packets.
- tbf_queue_packet(session[s].tbf_in, p, l);
+ if (session[s].tbf_in)
+ {
+ // Are we throttling this session?
+ if (config->cluster_iam_master)
+ tbf_queue_packet(session[s].tbf_in, p, l);
+ else
+ master_throttle_packet(session[s].tbf_in, p, l);
return;
}
snoop_send_packet(p, l, session[s].snoop_ip, session[s].snoop_port);
}
- increment_counter(&session[s].cin, &session[s].cin_wrap, l);
- session[s].cin_delta += l;
- session[s].pin++;
-
- sess_local[s].cin += l;
- sess_local[s].pin++;
+ update_sessions_in_stat(s, l);
eth_tx += l;
INC_STAT(tun_tx_bytes, l);
}
+// process Multilink PPP packet received
+void processmpin(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l)
+{
+ bundleidt b = session[s].bundle;
+ bundlet * this_bundle = &bundle[b];
+ uint32_t maskSeq, max_seq;
+ int frag_offset;
+ uint16_t frag_index, frag_index_next, frag_index_prev;
+ fragmentationt *this_fragmentation = &frag[b];
+ uint8_t begin_frame = (*p & MP_BEGIN);
+ uint8_t end_frame = (*p & MP_END);
+ uint32_t seq_num, seq_num_next, seq_num_prev;
+ uint32_t i;
+ uint8_t flags = *p;
+ uint16_t begin_index, end_index;
+
+ // Perform length checking
+ if(l > MAXFRAGLEN)
+ {
+ LOG(2, s, t, "MPPP: discarding fragment larger than MAXFRAGLEN\n");
+ return;
+ }
+
+ if(!b)
+ {
+ LOG(2, s, t, "MPPP: Invalid bundle id: 0\n");
+ return;
+ }
+ // FIXME !! session[s].mssf means that the receiver wants to receive frames in mssf not means the receiver will send frames in mssf
+ /* if(session[s].mssf)
+ {
+ // Get 12 bit for seq number
+ seq_num = ntohs((*(uint16_t *) p) & 0xFF0F);
+ p += 2;
+ l -= 2;
+ // After this point the pointer should be advanced 2 bytes
+ LOG(3, s, t, "MPPP: 12 bits, sequence number: %d\n",seq_num);
+ }
+ else */
+ {
+ // Get 24 bit for seq number
+ seq_num = ntohl((*(uint32_t *) p) & 0xFFFFFF00);
+ p += 4;
+ l -= 4;
+ // After this point the pointer should be advanced 4 bytes
+ LOG(4, s, t, "MPPP: 24 bits sequence number:%d\n",seq_num);
+ }
+
+ max_seq = this_bundle->max_seq;
+ maskSeq = max_seq - 1;
+
+ /*
+ * Expand sequence number to 32 bits, making it as close
+ * as possible to this_fragmentation->M.
+ */
+ seq_num |= this_fragmentation->M & ~maskSeq;
+ if ((int)(this_fragmentation->M - seq_num) > (int)(maskSeq >> 1))
+ {
+ seq_num += maskSeq + 1;
+ }
+ else if ((int)(seq_num - this_fragmentation->M) > (int)(maskSeq >> 1))
+ {
+ seq_num -= maskSeq + 1; /* should never happen */
+ }
+
+ // calculate this fragment's offset from the begin seq in the bundle
+ frag_offset = (int) (seq_num - this_fragmentation->start_seq);
+
+ sess_local[s].last_seq = seq_num;
+
+ // calculate the jitter average
+ uint32_t ljitter = time_now_ms - sess_local[s].prev_time;
+ if (ljitter > 0)
+ {
+ sess_local[s].jitteravg = (sess_local[s].jitteravg + ljitter)>>1;
+ sess_local[s].prev_time = time_now_ms;
+ }
+
+ uint32_t Mmin;
+
+ if (seq_num < this_fragmentation->M)
+ {
+ Mmin = seq_num;
+ this_fragmentation->M = seq_num;
+ }
+ else
+ {
+ Mmin = sess_local[(this_bundle->members[0])].last_seq;
+ for (i = 1; i < this_bundle->num_of_links; i++)
+ {
+ uint32_t s_seq = sess_local[(this_bundle->members[i])].last_seq;
+ if (s_seq < Mmin)
+ Mmin = s_seq;
+ }
+ this_fragmentation->M = Mmin;
+ }
+
+ // calculate M offset of the M seq in the bundle
+ int M_offset = (int) (Mmin - this_fragmentation->start_seq);
+
+ if (M_offset >= MAXFRAGNUM)
+ {
+ // There have a long break of the link !!!!!!!!
+ // M_offset is bigger that the fragmentation buffer size
+ LOG(3, s, t, "MPPP: M_offset out of range, min:%d, begin_seq:%d, jitteravg:%d\n", Mmin, this_fragmentation->start_seq, sess_local[s].jitteravg);
+
+ // Calculate the new start index, the previous frag are lost
+ begin_index = (M_offset + this_fragmentation->start_index) & MAXFRAGNUM_MASK;
+
+ // Set new Start sequence
+ this_fragmentation->start_index = begin_index;
+ this_fragmentation->start_seq = Mmin;
+ M_offset = 0;
+ // recalculate the fragment offset from the new begin seq in the bundle
+ frag_offset = (int) (seq_num - Mmin);
+ }
+
+ // discard this fragment if the packet comes before the start sequence
+ if (frag_offset < 0)
+ {
+ // this packet comes before the next
+ LOG(3, s, t, "MPPP: packet comes before the next, seq:%d, begin_seq:%d, size frag:%d\n", seq_num, this_fragmentation->start_seq, l);
+ return;
+ }
+
+ // discard if frag_offset is bigger that the fragmentation buffer size
+ if (frag_offset >= MAXFRAGNUM)
+ {
+ // frag_offset is bigger that the fragmentation buffer size
+ LOG(3, s, t, "MPPP: Index out of range, seq:%d, begin_seq:%d, jitteravg:%d\n", seq_num, this_fragmentation->start_seq, sess_local[s].jitteravg);
+ return;
+ }
+
+ //caculate received fragment's index in the fragment array
+ frag_index = (frag_offset + this_fragmentation->start_index) & MAXFRAGNUM_MASK;
+
+ // insert the frame in it's place
+ fragmentt *this_frag = &this_fragmentation->fragment[frag_index];
+
+ if (this_frag->length > 0)
+ // This fragment is lost, It was around the buffer and it was never completed the packet.
+ LOG(3, this_frag->sid, this_frag->tid, "MPPP: (INSERT) seq_num:%d frag_index:%d flags:%d jitteravg:%d is LOST\n",
+ this_frag->seq, frag_index, this_frag->flags, this_frag->jitteravg);
+
+ this_frag->length = l;
+ this_frag->sid = s;
+ this_frag->tid = t;
+ this_frag->flags = flags;
+ this_frag->seq = seq_num;
+ this_frag->jitteravg = sess_local[s].jitteravg;
+ memcpy(this_frag->data, p, l);
+
+ LOG(4, s, t, "MPPP: seq_num:%d frag_index:%d INSERTED flags: %02X\n", seq_num, frag_index, flags);
+
+ //next frag index
+ frag_index_next = (frag_index + 1) & MAXFRAGNUM_MASK;
+ //previous frag index
+ frag_index_prev = (frag_index - 1) & MAXFRAGNUM_MASK;
+ // next seq
+ seq_num_next = seq_num + 1;
+ // previous seq
+ seq_num_prev = seq_num - 1;
+
+ // Clean the buffer and log the lost fragments
+ if ((frag_index_next != this_fragmentation->start_index) && this_fragmentation->fragment[frag_index_next].length)
+ {
+ // check if the next frag is a lost fragment
+ if (this_fragmentation->fragment[frag_index_next].seq != seq_num_next)
+ {
+ // This fragment is lost, It was around the buffer and it was never completed the packet.
+ LOG(3, this_fragmentation->fragment[frag_index_next].sid, this_fragmentation->fragment[frag_index_next].tid,
+ "MPPP: (NEXT) seq_num:%d frag_index:%d flags:%d jitteravg:%d is LOST\n",
+ this_fragmentation->fragment[frag_index_next].seq, frag_index_next,
+ this_fragmentation->fragment[frag_index_next].flags, this_fragmentation->fragment[frag_index_next].jitteravg);
+ // this frag is lost
+ this_fragmentation->fragment[frag_index_next].length = 0;
+ this_fragmentation->fragment[frag_index_next].flags = 0;
+
+ if (begin_frame && (!end_frame)) return; // assembling frame failed
+ }
+ }
+
+ // Clean the buffer and log the lost fragments
+ if ((frag_index != this_fragmentation->start_index) && this_fragmentation->fragment[frag_index_prev].length)
+ {
+ // check if the next frag is a lost fragment
+ if (this_fragmentation->fragment[frag_index_prev].seq != seq_num_prev)
+ {
+ // This fragment is lost, It was around the buffer and it was never completed the packet.
+ LOG(3, this_fragmentation->fragment[frag_index_prev].sid, this_fragmentation->fragment[frag_index_prev].tid,
+ "MPPP: (PREV) seq_num:%d frag_index:%d flags:%d jitteravg:%d is LOST\n",
+ this_fragmentation->fragment[frag_index_prev].seq, frag_index_prev,
+ this_fragmentation->fragment[frag_index_prev].flags, this_fragmentation->fragment[frag_index_prev].jitteravg);
+
+ this_fragmentation->fragment[frag_index_prev].length = 0;
+ this_fragmentation->fragment[frag_index_prev].flags = 0;
+
+ if (end_frame && (!begin_frame)) return; // assembling frame failed
+ }
+ }
+
+find_frame:
+ begin_index = this_fragmentation->start_index;
+ uint32_t b_seq = this_fragmentation->start_seq;
+ // Try to find a Begin sequence from the start_seq sequence to M sequence
+ while (b_seq < Mmin)
+ {
+ if (this_fragmentation->fragment[begin_index].length)
+ {
+ if (b_seq == this_fragmentation->fragment[begin_index].seq)
+ {
+ if (this_fragmentation->fragment[begin_index].flags & MP_BEGIN)
+ {
+ int isfoundE = 0;
+ // Adjust the new start sequence and start index
+ this_fragmentation->start_index = begin_index;
+ this_fragmentation->start_seq = b_seq;
+ // Begin Sequence found, now try to found the End Sequence to complete the frame
+ end_index = begin_index;
+ while (b_seq < Mmin)
+ {
+ if (this_fragmentation->fragment[end_index].length)
+ {
+ if (b_seq == this_fragmentation->fragment[end_index].seq)
+ {
+ if (this_fragmentation->fragment[end_index].flags & MP_END)
+ {
+ // The End sequence was found and the frame is complete
+ isfoundE = 1;
+ break;
+ }
+ }
+ else
+ {
+ // This fragment is lost, it was never completed the packet.
+ LOG(3, this_fragmentation->fragment[end_index].sid, this_fragmentation->fragment[end_index].tid,
+ "MPPP: (FIND END) seq_num:%d frag_index:%d flags:%d jitteravg:%d is LOST\n",
+ this_fragmentation->fragment[end_index].seq, begin_index,
+ this_fragmentation->fragment[end_index].flags, this_fragmentation->fragment[end_index].jitteravg);
+ // this frag is lost
+ this_fragmentation->fragment[end_index].length = 0;
+ this_fragmentation->fragment[end_index].flags = 0;
+ // This frame is not complete find the next Begin
+ break;
+ }
+ }
+ else
+ {
+ // This frame is not complete find the next Begin if exist
+ break;
+ }
+ end_index = (end_index +1) & MAXFRAGNUM_MASK;
+ b_seq++;
+ }
+
+ if (isfoundE)
+ // The End sequence was found and the frame is complete
+ break;
+ else
+ // find the next Begin
+ begin_index = end_index;
+ }
+ }
+ else
+ {
+ // This fragment is lost, it was never completed the packet.
+ LOG(3, this_fragmentation->fragment[begin_index].sid, this_fragmentation->fragment[begin_index].tid,
+ "MPPP: (FIND BEGIN) seq_num:%d frag_index:%d flags:%d jitteravg:%d is LOST\n",
+ this_fragmentation->fragment[begin_index].seq, begin_index,
+ this_fragmentation->fragment[begin_index].flags, this_fragmentation->fragment[begin_index].jitteravg);
+ // this frag is lost
+ this_fragmentation->fragment[begin_index].length = 0;
+ this_fragmentation->fragment[begin_index].flags = 0;
+ }
+ }
+ begin_index = (begin_index +1) & MAXFRAGNUM_MASK;
+ b_seq++;
+ }
+
+assembling_frame:
+ // try to assemble the frame that has the received fragment as a member
+ // get the beginning of this frame
+ begin_index = end_index = this_fragmentation->start_index;
+ if (this_fragmentation->fragment[begin_index].length)
+ {
+ if (!(this_fragmentation->fragment[begin_index].flags & MP_BEGIN))
+ {
+ // should occur only after an "M_Offset out of range"
+ // The start sequence must be a begin sequence
+ this_fragmentation->start_index = (begin_index +1) & MAXFRAGNUM_MASK;
+ this_fragmentation->start_seq++;
+ return; // assembling frame failed
+ }
+ }
+ else
+ return; // assembling frame failed
+
+ // get the end of his frame
+ while (this_fragmentation->fragment[end_index].length)
+ {
+ if (this_fragmentation->fragment[end_index].flags & MP_END)
+ break;
+
+ end_index = (end_index +1) & MAXFRAGNUM_MASK;
+
+ if (end_index == this_fragmentation->start_index)
+ return; // assembling frame failed
+ }
+
+ // return if a lost fragment is found
+ if (!(this_fragmentation->fragment[end_index].length))
+ return; // assembling frame failed
+
+ // assemble the packet
+ //assemble frame, process it, reset fragmentation
+ uint16_t cur_len = 4; // This is set to 4 to leave 4 bytes for function processipin
+
+ LOG(4, s, t, "MPPP: processing fragments from %d to %d\n", begin_index, end_index);
+ // Push to the receive buffer
+
+ for (i = begin_index;; i = (i + 1) & MAXFRAGNUM_MASK)
+ {
+ this_frag = &this_fragmentation->fragment[i];
+ if(cur_len + this_frag->length > MAXETHER)
+ {
+ LOG(2, s, t, "MPPP: discarding reassembled frames larger than MAXETHER\n");
+ break;
+ }
+
+ memcpy(this_fragmentation->reassembled_frame+cur_len, this_frag->data, this_frag->length);
+ LOG(5, s, t, "MPPP: processing frame at %d, with len %d\n", i, this_frag->length);
+
+ cur_len += this_frag->length;
+ if (i == end_index)
+ {
+ this_fragmentation->re_frame_len = cur_len;
+ this_fragmentation->re_frame_begin_index = begin_index;
+ this_fragmentation->re_frame_end_index = end_index;
+ // Process the resassembled frame
+ LOG(5, s, t, "MPPP: Process the reassembled frame, len=%d\n",cur_len);
+ processmpframe(s, t, this_fragmentation->reassembled_frame, this_fragmentation->re_frame_len, 1);
+ break;
+ }
+ }
+
+ // Set reassembled frame length to zero after processing it
+ this_fragmentation->re_frame_len = 0;
+ for (i = begin_index;; i = (i + 1) & MAXFRAGNUM_MASK)
+ {
+ this_fragmentation->fragment[i].length = 0; // Indicates that this fragment has been consumed
+ this_fragmentation->fragment[i].flags = 0;
+ if (i == end_index)
+ break;
+ }
+
+ // Set the new start_index and start_seq
+ this_fragmentation->start_index = (end_index + 1) & MAXFRAGNUM_MASK;
+ this_fragmentation->start_seq = this_fragmentation->fragment[end_index].seq + 1;
+ LOG(4, s, t, "MPPP after assembling: start index is = %d, start seq=%d\n", this_fragmentation->start_index, this_fragmentation->start_seq);
+
+ begin_index = this_fragmentation->start_index;
+ if ((this_fragmentation->fragment[begin_index].length) &&
+ (this_fragmentation->fragment[begin_index].seq != this_fragmentation->start_seq))
+ {
+ LOG(3, this_fragmentation->fragment[begin_index].sid, this_fragmentation->fragment[begin_index].tid,
+ "MPPP: (START) seq_num:%d frag_index:%d flags:%d jitteravg:%d is LOST\n",
+ this_fragmentation->fragment[begin_index].seq, begin_index,
+ this_fragmentation->fragment[begin_index].flags, this_fragmentation->fragment[begin_index].jitteravg);
+ this_fragmentation->fragment[begin_index].length = 0;
+ this_fragmentation->fragment[begin_index].flags = 0;
+ }
+
+ if (this_fragmentation->start_seq <= Mmin)
+ // It's possible to find other complete frame or lost frame.
+ goto find_frame;
+ else if ((this_fragmentation->fragment[begin_index].length) &&
+ (this_fragmentation->fragment[begin_index].flags & MP_BEGIN))
+ // may be that the next frame is completed
+ goto assembling_frame;
+
+ return;
+}
+
// process IPv6 packet received
//
// This MUST be called with at least 4 byte behind 'p'.
snoop_send_packet(p, l, session[s].snoop_ip, session[s].snoop_port);
}
- increment_counter(&session[s].cin, &session[s].cin_wrap, l);
- session[s].cin_delta += l;
- session[s].pin++;
-
- sess_local[s].cin += l;
- sess_local[s].pin++;
+ update_sessions_in_stat(s, l);
eth_tx += l;
// Process CCP messages
void processccp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l)
{
- uint8_t b[MAXCONTROL];
+ uint8_t b[MAXETHER];
uint8_t *q;
CSTAT(processccp);
STAT(tunnel_rx_errors);
}
- LOG(3, s, t, "CCP: recv %s\n", ppp_code(*p));
+ LOG(4, s, t, "CCP: recv %s\n", ppp_code(*p));
if (*p == ConfigAck)
{
switch (session[s].ppp.ccp)
else // compression requested--reject
*p = ConfigRej;
- q = makeppp(b, sizeof(b), p, l, s, t, PPPCCP);
+ q = makeppp(b, sizeof(b), p, l, s, t, PPPCCP, 0, 0, 0);
if (!q) return;
switch (session[s].ppp.ccp)
{
case Closed:
- q = makeppp(b, sizeof(b), p, 2, s, t, PPPCCP);
+ q = makeppp(b, sizeof(b), p, 2, s, t, PPPCCP, 0, 0, 0);
if (!q) return;
*q = TerminateAck;
*((uint16_t *) (q + 2)) = htons(l = 4);
return;
}
- LOG(3, s, t, "CCP: send %s\n", ppp_code(*q));
+ LOG(4, s, t, "CCP: send %s\n", ppp_code(*q));
tunnelsend(b, l + (q - b), t);
}
else if (*p == TerminateReq)
{
*p = TerminateAck;
- q = makeppp(b, sizeof(b), p, l, s, t, PPPCCP);
+ q = makeppp(b, sizeof(b), p, l, s, t, PPPCCP, 0, 0, 0);
if (!q) return;
LOG(3, s, t, "CCP: send %s\n", ppp_code(*q));
tunnelsend(b, l + (q - b), t);
change_state(s, ccp, Stopped);
}
- else
+ else if (*p != CodeRej)
{
- int code = *p;
- int mru = session[s].mru;
- if (!mru)
- mru = DEFAULT_MRU;
-
- if (l > mru) l = mru;
-
- *p = CodeRej;
- q = makeppp(b, sizeof(b), p, l, s, t, PPPCCP);
- if (!q) return;
-
- LOG(2, s, t, "Unexpected CCP code %s\n", ppp_code(code));
- LOG(3, s, t, "CCP: send %s\n", ppp_code(*q));
- tunnelsend(b, l + (q - b), t);
+ ppp_code_rej(s, t, PPPCCP, "CCP", p, l, b, sizeof(b));
}
}
// send a CHAP challenge
void sendchap(sessionidt s, tunnelidt t)
{
- uint8_t b[MAXCONTROL];
+ uint8_t b[MAXETHER];
uint16_t r;
uint8_t *q;
radius[r].retry = backoff(radius[r].try++);
if (radius[r].try > 5)
{
- sessionshutdown(s, "CHAP timeout.", 3, 0);
+ sessionshutdown(s, "CHAP timeout.", CDN_ADMIN_DISC, TERM_REAUTHENTICATION_FAILURE);
STAT(tunnel_tx_errors);
return ;
}
- q = makeppp(b, sizeof(b), 0, 0, s, t, PPPCHAP);
+ q = makeppp(b, sizeof(b), 0, 0, s, t, PPPCHAP, 0, 0, 0);
if (!q) return;
*q = 1; // challenge
}
// fill in a L2TP message with a PPP frame,
-// copies existing PPP message and changes magic number if seen
// returns start of PPP frame
-uint8_t *makeppp(uint8_t *b, int size, uint8_t *p, int l, sessionidt s, tunnelidt t, uint16_t mtype)
+uint8_t *makeppp(uint8_t *b, int size, uint8_t *p, int l, sessionidt s, tunnelidt t, uint16_t mtype, uint8_t prio, bundleidt bid, uint8_t mp_bits)
{
- if (size < 12) // Need more space than this!!
+ uint16_t hdr = 0x0002; // L2TP with no options
+ uint16_t type = mtype;
+ uint8_t *start = b;
+
+ if (size < 16) // Need more space than this!!
{
- static int backtrace_count = 0;
LOG(0, s, t, "makeppp buffer too small for L2TP header (size=%d)\n", size);
- log_backtrace(backtrace_count, 5)
return NULL;
}
- *(uint16_t *) (b + 0) = htons(0x0002); // L2TP with no options
+ if (prio) hdr |= 0x0100; // set priority bit
+
+ *(uint16_t *) (b + 0) = htons(hdr);
*(uint16_t *) (b + 2) = htons(tunnel[t].far); // tunnel
*(uint16_t *) (b + 4) = htons(session[s].far); // session
b += 6;
- if (mtype == PPPLCP || !(session[s].l2tp_flags & SESSIONACFC))
+
+ // Check whether this session is part of multilink
+ if (bid)
+ {
+ if (bundle[bid].num_of_links > 1)
+ type = PPPMP; // Change PPP message type to the PPPMP
+ else
+ bid = 0;
+ }
+
+ if (type == PPPLCP || !(session[s].flags & SESSION_ACFC))
{
*(uint16_t *) b = htons(0xFF03); // HDLC header
b += 2;
}
- if (mtype < 0x100 && session[s].l2tp_flags & SESSIONPFC)
- *b++ = mtype;
+
+ if (type < 0x100 && session[s].flags & SESSION_PFC)
+ {
+ *b++ = type;
+ }
else
{
- *(uint16_t *) b = htons(mtype);
+ *(uint16_t *) b = htons(type);
b += 2;
}
- if (l + 12 > size)
+ if (bid)
+ {
+ // Set the sequence number and (B)egin (E)nd flags
+ if (session[s].mssf)
+ {
+ // Set the multilink bits
+ uint16_t bits_send = mp_bits;
+ *(uint16_t *) b = htons((bundle[bid].seq_num_t & 0x0FFF)|bits_send);
+ b += 2;
+ }
+ else
+ {
+ *(uint32_t *) b = htonl(bundle[bid].seq_num_t);
+ // Set the multilink bits
+ *b = mp_bits;
+ b += 4;
+ }
+
+ bundle[bid].seq_num_t++;
+
+ // Add the message type if this fragment has the begin bit set
+ if (mp_bits & MP_BEGIN)
+ {
+ //*b++ = mtype; // The next two lines are instead of this
+ *(uint16_t *) b = htons(mtype); // Message type
+ b += 2;
+ }
+ }
+
+ if ((b - start) + l > size)
{
- static int backtrace_count = 0;
- LOG(2, s, t, "makeppp would overflow buffer (size=%d, header+payload=%d)\n", size, l + 12);
- log_backtrace(backtrace_count, 5)
+ LOG(2, s, t, "makeppp would overflow buffer (size=%d, header+payload=%td)\n", size, (b - start) + l);
return NULL;
}
+ // Copy the payload
if (p && l)
memcpy(b, p, l);
return len;
}
-// Send initial LCP ConfigReq for MRU, authentication type and magic no
-void sendlcp(sessionidt s, tunnelidt t, int authtype)
+// Send LCP ConfigReq for MRU, authentication type and magic no
+void sendlcp(sessionidt s, tunnelidt t)
{
uint8_t b[500], *q, *l;
+ int authtype = sess_local[s].lcp_authtype;
- if (!(q = makeppp(b, sizeof(b), NULL, 0, s, t, PPPLCP)))
+ if (!(q = makeppp(b, sizeof(b), NULL, 0, s, t, PPPLCP, 0, 0, 0)))
return;
- LOG(3, s, t, "LCP: send ConfigReq%s%s%s\n",
+ LOG(3, s, t, "LCP: send ConfigReq%s%s%s including MP options\n",
authtype ? " (" : "",
authtype ? (authtype == AUTHCHAP ? "CHAP" : "PAP") : "",
authtype ? ")" : "");
- if (!session[s].mru)
- session[s].mru = DEFAULT_MRU;
-
l = q;
*l++ = ConfigReq;
- *l++ = (time_now % 255) + 1; // ID
+ *l++ = ++sess_local[s].lcp_ident; // ID
l += 2; //Save space for length
- *l++ = 1; *l++ = 4; // Maximum-Receive-Unit (length 4)
- *(uint16_t *) l = htons(session[s].mru); l += 2;
+ if (sess_local[s].ppp_mru)
+ {
+ *l++ = 1; *l++ = 4; // Maximum-Receive-Unit (length 4)
+ *(uint16_t *) l = htons(sess_local[s].ppp_mru); l += 2;
+ }
if (authtype)
l += add_lcp_auth(l, sizeof(b) - (l - b), authtype);
- *l++ = 5; *l++ = 6; // Magic-Number (length 6)
- *(uint32_t *) l = htonl(session[s].magic);
- l += 4;
+ if (session[s].magic)
+ {
+ *l++ = 5; *l++ = 6; // Magic-Number (length 6)
+ *(uint32_t *) l = htonl(session[s].magic);
+ l += 4;
+ }
+
+ if (sess_local[s].mp_mrru)
+ {
+ *l++ = 17; *l++ = 4; // Multilink Max-Receive-Reconstructed-Unit (length 4)
+ *(uint16_t *) l = htons(sess_local[s].mp_mrru); l += 2;
+ }
+
+ if (sess_local[s].mp_epdis)
+ {
+ *l++ = 19; *l++ = 7; // Multilink Endpoint Discriminator (length 7)
+ *l++ = IPADDR; // Endpoint Discriminator class
+ *(uint32_t *) l = htonl(sess_local[s].mp_epdis);
+ l += 4;
+ }
*(uint16_t *)(q + 2) = htons(l - q); // Length
if (config->debug > 3) dumplcp(q, l - q);
tunnelsend(b, (l - b), t);
+ restart_timer(s, lcp);
}
// Send CCP request for no compression
{
uint8_t b[500], *q;
- if (!(q = makeppp(b, sizeof(b), NULL, 0, s, t, PPPCCP)))
+ if (!(q = makeppp(b, sizeof(b), NULL, 0, s, t, PPPCCP, 0, 0, 0)))
return;
LOG(3, s, t, "CCP: send ConfigReq (no compression)\n");
*q = ConfigReq;
- *(uint8_t *)(q + 1) = (time_now % 255) + 1; // ID
+ *(q + 1) = ++sess_local[s].lcp_ident; // ID
*(uint16_t *)(q + 2) = htons(4); // Length
LOG_HEX(5, "PPPCCP", q, 4);
tunnelsend(b, (q - b) + 4 , t);
+ restart_timer(s, ccp);
+}
+
+// Reject unknown/unconfigured protocols
+void protoreject(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l, uint16_t proto)
+{
+
+ uint8_t buf[MAXETHER];
+ uint8_t *q;
+ int mru = session[s].mru;
+ if (mru < MINMTU) mru = MINMTU;
+ if (mru > sizeof(buf)) mru = sizeof(buf);
+
+ l += 6;
+ if (l > mru) l = mru;
+
+ q = makeppp(buf, sizeof(buf), 0, 0, s, t, PPPLCP, 0, 0, 0);
+ if (!q) return;
+
+ *q = ProtocolRej;
+ *(q + 1) = ++sess_local[s].lcp_ident;
+ *(uint16_t *)(q + 2) = htons(l);
+ *(uint16_t *)(q + 4) = htons(proto);
+ memcpy(q + 6, p, l - 6);
+
+ if (proto == PPPIPV6CP)
+ LOG(3, s, t, "LCP: send ProtocolRej (IPV6CP: not configured)\n");
+ else
+ LOG(2, s, t, "LCP: sent ProtocolRej (0x%04X: unsupported)\n", proto);
+
+ tunnelsend(buf, l + (q - buf), t);
}
projects / l2tpns.git / blobdiff