// L2TPNS PPP Stuff
-char const *cvs_id_ppp = "$Id: ppp.c,v 1.67 2005/08/10 08:59:23 bodea Exp $";
+char const *cvs_id_ppp = "$Id: ppp.c,v 1.99 2006/04/18 06:00:08 bodea Exp $";
#include <stdio.h>
#include <string.h>
static int add_lcp_auth(uint8_t *b, int size, int authtype);
// Process PAP messages
-void processpap(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l)
+void processpap(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l)
{
char user[MAXUSER];
char pass[MAXPASS];
{
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);
}
- r = radiusnew(s);
- if (session[s].ip || !r)
+ 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, t, s, PPPPAP);
+ uint8_t *p = makeppp(b, sizeof(b), 0, 0, s, t, PPPPAP);
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
}
// Process CHAP messages
-void processchap(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l)
+void processchap(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l)
{
uint16_t r;
uint16_t hl;
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;
+ }
+
+ r = sess_local[s].radius;
+ if (!r)
+ {
+ LOG(3, s, t, "Unexpected CHAP message\n");
return;
}
{
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;
}
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");
}
}
}
-void lcp_open(tunnelidt t, sessionidt s)
+void lcp_open(sessionidt s, tunnelidt t)
{
// transition to Authentication or Network phase:
session[s].ppp.phase = sess_local[s].lcp_authtype ? Authenticate : Network;
+ LOG(3, s, t, "LCP: Opened, phase %s\n", ppp_phase(session[s].ppp.phase));
+
// LCP now Opened
change_state(s, lcp, Opened);
if (session[s].ppp.phase == Authenticate)
{
if (sess_local[s].lcp_authtype == AUTHCHAP)
- sendchap(t, s);
+ sendchap(s, t);
}
else
{
// This-Layer-Up
- sendipcp(t, s);
+ 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, 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, session[s].tunnel, s, mtype);
+ queued = *response = makeppp(buf, blen, packet, 2, s, session[s].tunnel, mtype);
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, session[s].tunnel, s, mtype);
+ queued = *response = makeppp(buf, blen, packet, 2, s, session[s].tunnel, mtype);
if (!queued)
return 0;
- *nak_sent++;
+ (*nak_sent)++;
*queued = ConfigNak;
queued += 4;
}
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);
+ 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(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l)
+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 || *p == EchoReply) ? 4 : 3, s, t,
+ "LCP: recv %s\n", ppp_code(*p));
+
+ if (config->debug > 3) dumplcp(p, l);
+
if (*p == ConfigAck)
{
int x = l - 4;
uint8_t *o = (p + 4);
int authtype = 0;
- LOG(3, s, t, "LCP: ConfigAck (%d bytes)...\n", l);
- if (config->debug > 3) dumplcp(p, l);
-
while (x > 2)
{
int type = o[0];
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;
case AckSent:
- lcp_open(t, s);
+ lcp_open(s, t);
break;
default:
static uint8_t asyncmap[4] = { 0, 0, 0, 0 }; // all zero
static uint8_t authproto[5];
- LOG(3, s, t, "LCP: ConfigReq (%d bytes)...\n", l);
- if (config->debug > 3) dumplcp(p, l);
-
while (x > 2)
{
int type = o[0];
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;
+ cluster_send_session(s);
+ 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
if (!ntohl(*(uint32_t *)(o + 2))) // all bits zero is OK
break;
- LOG(2, s, t, " Remote requesting asyncmap. Rejecting.\n");
- q = ppp_nak(s, b, sizeof(b), PPPLCP, &response, q, p, o, asyncmap, sizeof(asyncmap));
+ LOG(3, s, t, " Remote requesting asyncmap. Rejecting.\n");
+ q = ppp_conf_nak(s, b, sizeof(b), PPPLCP, &response, q, p, o, asyncmap, sizeof(asyncmap));
break;
case 3: // Authentication-Protocol
else
sprintf(proto_name, "%#4.4x", proto);
- LOG(2, s, t, " Remote requesting %s authentication. Rejecting.\n", proto_name);
+ LOG(3, s, t, " Remote requesting %s authentication. Rejecting.\n", proto_name);
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;
default: // Reject any unknown options
- LOG(2, s, t, " Rejecting PPP LCP Option type %d\n", type);
- q = ppp_rej(s, b, sizeof(b), PPPLCP, &response, q, p, o);
+ LOG(3, s, t, " Rejecting unknown PPP LCP option %d\n", type);
+ q = ppp_conf_rej(s, b, sizeof(b), PPPLCP, &response, q, p, o);
}
x -= length;
o += length;
else
{
// Send packet back as ConfigAck
- response = makeppp(b, sizeof(b), p, l, t, s, PPPLCP);
+ response = makeppp(b, sizeof(b), p, l, s, t, PPPLCP);
if (!response) return;
*response = ConfigAck;
}
switch (session[s].ppp.lcp)
{
case Closed:
- response = makeppp(b, sizeof(b), p, 2, t, s, PPPLCP);
+ response = makeppp(b, sizeof(b), p, 2, s, t, PPPLCP);
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 AckReceived:
if (*response == ConfigAck)
- lcp_open(t, s);
+ lcp_open(s, t);
break;
case Opened:
lcp_restart(s);
- sendlcp(s, t, sess_local[s].lcp_authtype);
+ sendlcp(s, t);
/* fallthrough */
case AckSent:
return;
}
- LOG(3, s, t, "LCP: Sending %s\n", ppp_code(*response));
+ LOG(3, s, t, "LCP: send %s\n", ppp_code(*response));
+ if (config->debug > 3) dumplcp(response, l);
+
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);
int authtype = -1;
- LOG(3, s, t, "LCP: ConfigNak (%d bytes)...\n", l);
- if (config->debug > 3) dumplcp(p, l);
-
while (x > 2)
{
int type = o[0];
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;
+
+ 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, t, s, PPPLCP);
+ uint8_t *response = makeppp(b, sizeof(b), p, 2, s, t, PPPLCP);
if (!response) return;
*response = TerminateAck;
*((uint16_t *) (response + 2)) = htons(l = 4);
+
+ LOG(3, s, t, "LCP: send %s\n", ppp_code(*response));
+ if (config->debug > 3) dumplcp(response, l);
+
tunnelsend(b, l + (response - b), t);
}
break;
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)
{
- LOG(3, s, t, "LCP: Received TerminateReq. Sending TerminateAck\n");
- *p = TerminateAck; // close
- q = makeppp(b, sizeof(b), p, l, t, s, 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);
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)
{
- LOG(5, s, t, "LCP: Received EchoReq. Sending EchoReply\n");
*p = EchoReply; // reply
*(uint32_t *) (p + 4) = htonl(session[s].magic); // our magic number
- q = makeppp(b, sizeof(b), p, l, t, s, PPPLCP);
+ q = makeppp(b, sizeof(b), p, l, s, t, PPPLCP);
if (!q) return;
+
+ LOG(4, s, t, "LCP: send %s\n", ppp_code(*q));
+ if (config->debug > 3) dumplcp(q, l);
+
tunnelsend(b, l + (q - b), t); // send it
}
else if (*p == EchoReply)
{
// 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;
-
- if (l > mru) l = mru;
-
- *p = CodeRej;
- q = makeppp(b, sizeof(b), p, l, t, s, PPPLCP);
- if (!q) return;
-
- LOG(3, s, t, "Unexpected LCP code %s\n", ppp_code(code));
- tunnelsend(b, l + (q - b), t);
+ ppp_code_rej(s, t, PPPLCP, "LCP", p, l, b, sizeof(b));
}
}
-static void ipcp_open(tunnelidt t, sessionidt s)
+static void ipcp_open(sessionidt s, tunnelidt t)
{
LOG(3, s, t, "IPCP: Opened, session is now active\n");
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
if (session[s].ppp.ipv6cp == Stopped)
{
- sendipv6cp(t, s);
+ sendipv6cp(s, t);
change_state(s, ipv6cp, RequestSent);
}
}
// Process IPCP messages
-void processipcp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l)
+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);
return;
}
+ LOG(3, s, t, "IPCP: recv %s\n", ppp_code(*p));
+
if (*p == ConfigAck)
{
switch (session[s].ppp.ipcp)
break;
case AckSent:
- ipcp_open(t, s);
+ ipcp_open(s, t);
break;
default:
int gotip = 0;
in_addr_t addr;
- LOG(3, s, t, "IPCP: ConfigReq received\n");
-
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)))
{
- q = ppp_nak(s, b, sizeof(b), PPPIPCP, &response, q, p, o, (uint8_t *) &addr, sizeof(addr));
- if (!q || *response == ConfigRej)
+ uint8_t *oq = q;
+ 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, t, s, PPPIPCP);
+ response = makeppp(b, sizeof(b), p, l, s, t, PPPIPCP);
if (!response) return;
*response = ConfigAck;
}
switch (session[s].ppp.ipcp)
{
case Closed:
- response = makeppp(b, sizeof(b), p, 2, t, s, PPPIPCP);
+ response = makeppp(b, sizeof(b), p, 2, s, t, PPPIPCP);
if (!response) return;
*response = TerminateAck;
*((uint16_t *) (response + 2)) = htons(l = 4);
case AckReceived:
if (*response == ConfigAck)
- ipcp_open(t, s);
+ ipcp_open(s, t);
break;
return;
}
- LOG(3, s, t, "IPCP: Sending %s\n", ppp_code(*response));
+ LOG(3, s, t, "IPCP: send %s\n", ppp_code(*response));
tunnelsend(b, l + (response - b), t);
}
else if (*p == TerminateReq)
{
- LOG(3, s, t, "IPCP: Received TerminateReq. Sending TerminateAck\n");
- *p = TerminateAck;
- q = makeppp(b, sizeof(b), p, l, t, s, PPPIPCP);
- if (!q) return;
- 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;
- if (l > mru) l = mru;
+ case Opened:
+ zero_restart_count(s, ipcp);
+ change_state(s, ipcp, Closing);
+ break;
- *p = CodeRej;
- q = makeppp(b, sizeof(b), p, l, t, s, PPPIPCP);
+ default:
+ LOG(2, s, t, "IPCP: ignoring %s in state %s\n", ppp_code(*p), ppp_state(session[s].ppp.ipcp));
+ return;
+ }
+
+ *p = TerminateAck; // send ack
+ q = makeppp(b, sizeof(b), p, l, s, t, PPPIPCP);
if (!q) return;
- LOG(3, s, t, "Unexpected IPCP code %s\n", ppp_code(code));
- tunnelsend(b, l + (q - b), t);
+ LOG(3, s, t, "IPCP: send %s\n", ppp_code(*q));
+ tunnelsend(b, l + (q - b), t); // send it
+ }
+ else if (*p != CodeRej)
+ {
+ ppp_code_rej(s, t, PPPIPCP, "IPCP", p, l, b, sizeof(b));
}
}
-static void ipv6cp_open(tunnelidt t, sessionidt s)
+static void ipv6cp_open(sessionidt s, tunnelidt t)
{
LOG(3, s, t, "IPV6CP: Opened\n");
route6set(s, session[s].ipv6route, session[s].ipv6prefixlen, 1);
// Send an initial RA (TODO: Should we send these regularly?)
- send_ipv6_ra(t, s, NULL);
+ send_ipv6_ra(s, t, NULL);
}
// Process IPV6CP messages
-void processipv6cp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l)
+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;
return;
}
- 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, t, s, PPPIPV6CP);
- if (!q) return;
- tunnelsend(b, l + (q - b), t);
- return;
- }
+ LOG(3, s, t, "IPV6CP: recv %s\n", ppp_code(*p));
if (!session[s].ip)
{
break;
case AckSent:
- ipv6cp_open(t, s);
+ ipv6cp_open(s, t);
break;
default:
int gotip = 0;
uint8_t ident[8];
- LOG(3, s, t, "IPV6CP: ConfigReq received\n");
-
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;
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, 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, t, s, PPPIPV6CP);
+ response = makeppp(b, sizeof(b), p, l, s, t, PPPIPV6CP);
if (!response) return;
*response = ConfigAck;
}
switch (session[s].ppp.ipv6cp)
{
case Closed:
- response = makeppp(b, sizeof(b), p, 2, t, s, PPPIPV6CP);
+ response = makeppp(b, sizeof(b), p, 2, s, t, PPPIPV6CP);
if (!response) return;
*response = TerminateAck;
*((uint16_t *) (response + 2)) = htons(l = 4);
case AckReceived:
if (*response == ConfigAck)
- ipv6cp_open(t, s);
+ ipv6cp_open(s, t);
break;
return;
}
- LOG(3, s, t, "IPV6CP: Sending %s\n", ppp_code(*response));
+ LOG(3, s, t, "IPV6CP: send %s\n", ppp_code(*response));
tunnelsend(b, l + (response - b), t);
}
else if (*p == TerminateReq)
{
- LOG(3, s, t, "IPV6CP: Received TerminateReq. Sending TerminateAck\n");
- *p = TerminateAck;
- q = makeppp(b, sizeof(b), p, l, t, s, PPPIPV6CP);
- if (!q) return;
- tunnelsend(b, l + (q - b), t);
- change_state(s, ipv6cp, Stopped);
- }
- else
- {
- int code = *p;
- int mru = session[s].mru;
- if (!mru)
- mru = DEFAULT_MRU;
+ 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;
- if (l > mru) l = mru;
+ default:
+ LOG(2, s, t, "IPV6CP: ignoring %s in state %s\n", ppp_code(*p), ppp_state(session[s].ppp.ipv6cp));
+ return;
+ }
- *p = CodeRej;
- q = makeppp(b, sizeof(b), p, l, t, s, PPPIPV6CP);
+ *p = TerminateAck; // send ack
+ q = makeppp(b, sizeof(b), p, l, s, t, PPPIPV6CP);
if (!q) return;
- LOG(3, s, t, "Unexpected IPV6CP code %s\n", ppp_code(code));
- tunnelsend(b, l + (q - b), t);
+ LOG(3, s, t, "IPV6CP: send %s\n", ppp_code(*q));
+ tunnelsend(b, l + (q - b), t); // send it
+ }
+ else if (*p != CodeRej)
+ {
+ ppp_code_rej(s, t, PPPIPV6CP, "IPV6CP", p, l, b, sizeof(b));
}
}
//
// This MUST be called with at least 4 byte behind 'p'.
// (i.e. this routine writes to p[-4]).
-void processipin(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l)
+void processipin(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l)
{
in_addr_t ip;
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].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);
//
// This MUST be called with at least 4 byte behind 'p'.
// (i.e. this routine writes to p[-4]).
-void processipv6in(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l)
+void processipv6in(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l)
{
struct in6_addr ip;
in_addr_t ipv4;
*(uint32_t *)(p + 34) == 0 &&
*(p + 38) == 0 && *(p + 39) == 2 && *(p + 40) == 133) {
LOG(3, s, t, "Got IPv6 RS\n");
- send_ipv6_ra(t, s, &ip);
+ send_ipv6_ra(s, t, &ip);
return;
}
// Process CCP messages
-void processccp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l)
+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));
if (*p == ConfigAck)
{
switch (session[s].ppp.ccp)
else // compression requested--reject
*p = ConfigRej;
- q = makeppp(b, sizeof(b), p, l, t, s, PPPCCP);
+ q = makeppp(b, sizeof(b), p, l, s, t, PPPCCP);
if (!q) return;
switch (session[s].ppp.ccp)
{
case Closed:
- q = makeppp(b, sizeof(b), p, 2, t, s, PPPCCP);
+ q = makeppp(b, sizeof(b), p, 2, s, t, PPPCCP);
if (!q) return;
*q = TerminateAck;
*((uint16_t *) (q + 2)) = htons(l = 4);
return;
}
- LOG(3, s, t, "CCP: Sending %s\n", ppp_code(*q));
+ LOG(3, s, t, "CCP: send %s\n", ppp_code(*q));
tunnelsend(b, l + (q - b), t);
}
else if (*p == TerminateReq)
{
- LOG(3, s, t, "CCP: Received TerminateReq. Sending TerminateAck\n");
*p = TerminateAck;
- q = makeppp(b, sizeof(b), p, l, t, s, PPPCCP);
+ q = makeppp(b, sizeof(b), p, l, s, t, PPPCCP);
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, t, s, PPPCCP);
- if (!q) return;
-
- LOG(3, s, t, "Unexpected CCP code %s\n", ppp_code(code));
- tunnelsend(b, l + (q - b), t);
+ ppp_code_rej(s, t, PPPCCP, "CCP", p, l, b, sizeof(b));
}
}
// send a CHAP challenge
-void sendchap(tunnelidt t, sessionidt s)
+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, t, s, PPPCHAP);
+ q = makeppp(b, sizeof(b), 0, 0, s, t, PPPCHAP);
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, tunnelidt t, sessionidt s, uint16_t mtype)
+uint8_t *makeppp(uint8_t *b, int size, uint8_t *p, int l, sessionidt s, tunnelidt t, uint16_t mtype)
{
if (size < 12) // 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 + 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))
+ if (mtype == PPPLCP || !(session[s].flags & SESSION_ACFC))
{
*(uint16_t *) b = htons(0xFF03); // HDLC header
b += 2;
}
- if (mtype < 0x100 && session[s].l2tp_flags & SESSIONPFC)
+ if (mtype < 0x100 && session[s].flags & SESSION_PFC)
*b++ = mtype;
else
{
if (l + 12 > 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)
return NULL;
}
return len;
}
-// Send initial LCP ConfigReq for MRU, authentication type and magic no
-void sendlcp(tunnelidt t, sessionidt s, 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, t, s, PPPLCP)))
+ if (!(q = makeppp(b, sizeof(b), NULL, 0, s, t, PPPLCP)))
return;
- LOG(4, s, t, "Sending LCP ConfigReq%s%s\n",
- authtype ? " for " : "",
- authtype ? (authtype == AUTHCHAP ? "CHAP" : "PAP") : "");
-
- if (!session[s].mru)
- session[s].mru = DEFAULT_MRU;
+ LOG(3, s, t, "LCP: send ConfigReq%s%s%s\n",
+ authtype ? " (" : "",
+ authtype ? (authtype == AUTHCHAP ? "CHAP" : "PAP") : "",
+ authtype ? ")" : "");
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;
+ }
*(uint16_t *)(q + 2) = htons(l - q); // Length
LOG_HEX(5, "PPPLCP", q, l - q);
+ if (config->debug > 3) dumplcp(q, l - q);
+
tunnelsend(b, (l - b), t);
+ restart_timer(s, lcp);
}
// Send CCP request for no compression
-void sendccp(tunnelidt t, sessionidt s)
+void sendccp(sessionidt s, tunnelidt t)
{
uint8_t b[500], *q;
- if (!(q = makeppp(b, sizeof(b), NULL, 0, t, s, PPPCCP)))
+ if (!(q = makeppp(b, sizeof(b), NULL, 0, s, t, PPPCCP)))
return;
- LOG(4, s, t, "Sending CCP ConfigReq for no compression\n");
+ 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);
+ 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