// L2TPNS PPP Stuff
-char const *cvs_id_ppp = "$Id: ppp.c,v 1.52 2005/05/07 13:12:26 bodea Exp $";
+char const *cvs_id_ppp = "$Id: ppp.c,v 1.64 2005/06/24 08:34:53 bodea Exp $";
#include <stdio.h>
#include <string.h>
LOG(1, s, t, "Short PAP %u bytes\n", l);
STAT(tunnel_rx_errors);
sessionshutdown(s, "Short PAP packet.", 3, 0);
- return ;
+ return;
}
if ((hl = ntohs(*(uint16_t *) (p + 2))) > l)
LOG(1, s, t, "Length mismatch PAP %u/%u\n", hl, l);
STAT(tunnel_rx_errors);
sessionshutdown(s, "PAP length mismatch.", 3, 0);
- return ;
+ return;
}
l = hl;
LOG(1, s, t, "Unexpected PAP code %d\n", *p);
STAT(tunnel_rx_errors);
sessionshutdown(s, "Unexpected PAP code.", 3, 0);
- return ;
+ return;
}
{
{
LOG(1, s, t, "Short CHAP %u bytes\n", l);
STAT(tunnel_rx_errors);
- return ;
+ sessionshutdown(s, "Short CHAP packet.", 3, 0);
+ return;
}
if ((hl = ntohs(*(uint16_t *) (p + 2))) > l)
{
LOG(1, s, t, "Length mismatch CHAP %u/%u\n", hl, l);
STAT(tunnel_rx_errors);
- return ;
+ sessionshutdown(s, "CHAP length mismatch.", 3, 0);
+ 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);
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);
- return ;
+ sessionshutdown(s, "Unexpected CHAP response ID.", 3, 0);
+ return;
}
if (l < 5 || p[4] != 16)
{
LOG(1, s, t, "Bad CHAP response length %d\n", l < 5 ? -1 : p[4]);
STAT(tunnel_rx_errors);
- return ;
+ sessionshutdown(s, "Bad CHAP response length.", 3, 0);
+ return;
}
l -= 5;
{
LOG(1, s, t, "CHAP user too long %d\n", l - 16);
STAT(tunnel_rx_errors);
- return ;
+ sessionshutdown(s, "CHAP username too long.", 3, 0);
+ return;
}
// Run PRE_AUTH plugins
if (*p == ConfigAck)
{
- LOG(3, s, t, "LCP: Discarding ConfigAck\n");
+ int x = l - 4;
+ uint8_t *o = (p + 4);
+
+ LOG(3, s, t, "LCP: ConfigAck (%d bytes)...\n", l);
+ if (config->debug > 3) dumplcp(p, l);
+
+ while (x > 2)
+ {
+ int type = o[0];
+ int length = o[1];
+
+ if (length == 0 || type == 0 || x < length) break;
+ switch (type)
+ {
+ case 3: // Authentication-Protocol
+ {
+ int proto = ntohs(*(uint16_t *)(o + 2));
+ if (proto == PPPCHAP && *(o + 4) == 5)
+ sendchap(t, s);
+ }
+
+ break;
+ }
+ x -= length;
+ o += length;
+ }
+
session[s].flags |= SF_LCP_ACKED;
}
else if (*p == ConfigReq)
*q++ = 6;
memset(q, 0, 4); // asyncmap 0
q += 4;
- *((uint16_t *) (response + 2)) = htons(q - response); // LCP header length
break;
case 3: // Authentication-Protocol
q = a;
}
- *((uint16_t *) (response + 2)) = htons(q - response); // LCP header length
break;
}
break;
memcpy(q, o, length);
q += length;
- *((uint16_t *) (response + 2)) = htons(q - response); // LCP header length
}
x -= length;
o += length;
}
- if (!response)
+ if (response)
{
- // Send back a ConfigAck
- q = response = makeppp(b, sizeof(b), p, l, t, s, PPPLCP);
- if (!q) return;
- *q = ConfigAck;
+ l = q - response; // LCP packet length
+ *((uint16_t *) (response + 2)) = htons(l); // update header
+ }
+ else
+ {
+ // Send packet back as ConfigAck
+ response = makeppp(b, sizeof(b), p, l, t, s, PPPLCP);
+ if (!response) return;
+ *response = ConfigAck;
}
LOG(3, s, t, "Sending %s\n", ppp_lcp_type(*response));
- tunnelsend(b, l + (q - b), t);
+ tunnelsend(b, l + response - b, t);
if (!(session[s].flags & SF_LCP_ACKED))
sendlcp(t, s, config->radius_authprefer);
}
else if (*p == ConfigNak)
{
- LOG(1, s, t, "Remote end sent a ConfigNak. Ignoring\n");
+ 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);
- // FIXME: handle MRU, authentication type
- return;
+
+ while (x > 2)
+ {
+ int type = o[0];
+ int length = o[1];
+
+ if (length == 0 || type == 0 || x < length) break;
+ 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);
+ break;
+
+ case 3: // Authentication-Protocol
+ if (authtype > 0)
+ break;
+
+ {
+ int 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)
+ {
+ authtype = config->radius_authtypes & AUTHCHAP;
+ LOG(3, s, t, " Remote requested CHAP authentication...%sing\n",
+ authtype ? "accept" : "reject");
+ }
+ else
+ {
+ LOG(3, s, t, " Rejecting unsupported authentication %#4x\n",
+ proto);
+ }
+ }
+
+ break;
+
+ default:
+ LOG(2, s, t, " Remote NAKed LCP type %u?\n", type);
+ break;
+ }
+ x -= length;
+ o += length;
+ }
+
+ if (!authtype)
+ {
+ sessionshutdown(s, "Unsupported authentication.", 3, 0);
+ return;
+ }
+
+ if (authtype == -1)
+ authtype = config->radius_authprefer;
+
+ sendlcp(t, s, authtype);
}
else if (*p == TerminateReq)
{
{
LOG(1, s, t, "Unexpected LCP code %d\n", *p);
STAT(tunnel_rx_errors);
- return ;
}
}
if (*p == ConfigAck)
{
- // happy with our IPCP
uint16_t r = sess_local[s].radius;
- if ((!r || radius[r].state == RADIUSIPCP) && !session[s].walled_garden)
- {
- if (!r)
- r = radiusnew(s);
- if (r)
- radiussend(r, RADIUSSTART); // send radius start, having got IPCP at last
- }
+
+ // ignore duplicate ACKs
+ if (session[s].flags & SF_IPCP_ACKED)
+ return;
+
+ // happy with our IPCP
session[s].flags |= SF_IPCP_ACKED;
LOG(3, s, t, "IPCP Acked, session is now active\n");
- // clear LCP_ACKED/CCP_ACKED flag for possible fast renegotiaion for routers
+ // clear LCP_ACKED/CCP_ACKED flag for possible fast renegotiation for routers
session[s].flags &= ~(SF_LCP_ACKED|SF_CCP_ACKED);
+ if (r && session[s].walled_garden)
+ {
+ radiusclear(r, s);
+ return;
+ }
+
+ if (!r)
+ r = radiusnew(s);
+
+ if (r)
+ radiussend(r, RADIUSSTART); // send radius start, having got IPCP at last
+
return;
}
if (*p != ConfigReq)
return;
}
+ p += 4;
+ l -= 4;
+
if (session[s].snoop_ip && session[s].snoop_port)
{
// Snooping this session
- snoop_send_packet(p + 4, l - 4, session[s].snoop_ip, session[s].snoop_port);
+ snoop_send_packet(p, l, session[s].snoop_ip, session[s].snoop_port);
}
- session[s].cin += l - 4;
- session[s].total_cin += l - 4;
- sess_local[s].cin += l - 4;
-
+ increment_counter(&session[s].cin, &session[s].cin_wrap, l);
+ session[s].cin_delta += l;
session[s].pin++;
- eth_tx += l - 4;
+
+ sess_local[s].cin += l;
+ sess_local[s].pin++;
+
+ eth_tx += l;
STAT(tun_tx_packets);
- INC_STAT(tun_tx_bytes, l - 4);
+ INC_STAT(tun_tx_bytes, l);
}
// process IPv6 packet received
return;
}
+ p += 4;
+ l -= 4;
+
if (session[s].snoop_ip && session[s].snoop_port)
{
// Snooping this session
- snoop_send_packet(p + 4, l - 4, session[s].snoop_ip, session[s].snoop_port);
+ snoop_send_packet(p, l, session[s].snoop_ip, session[s].snoop_port);
}
- session[s].cin += l - 4;
- session[s].total_cin += l - 4;
- sess_local[s].cin += l - 4;
-
+ increment_counter(&session[s].cin, &session[s].cin_wrap, l);
+ session[s].cin_delta += l;
session[s].pin++;
- eth_tx += l - 4;
+
+ sess_local[s].cin += l;
+ sess_local[s].pin++;
+
+ eth_tx += l;
STAT(tun_tx_packets);
- INC_STAT(tun_tx_bytes, l - 4);
+ INC_STAT(tun_tx_bytes, l);
}
//
return;
}
+ buf += 4;
+ len -= 4;
+
if (session[s].snoop_ip && session[s].snoop_port)
{
// Snooping this session
- snoop_send_packet(buf + 4, len - 4, session[s].snoop_ip, session[s].snoop_port);
+ snoop_send_packet(buf, len, session[s].snoop_ip, session[s].snoop_port);
}
// Increment packet counters
- session[s].cin += len - 4;
- session[s].total_cin += len - 4;
- sess_local[s].cin += len - 4;
-
+ increment_counter(&session[s].cin, &session[s].cin_wrap, len);
+ session[s].cin_delta += len;
session[s].pin++;
- eth_tx += len - 4;
+
+ sess_local[s].cin += len;
+ sess_local[s].pin++;
+
+ eth_tx += len;
STAT(tun_tx_packets);
INC_STAT(tun_tx_bytes, len - 4);
return;
LOG(4, s, t, "Sending LCP ConfigReq for %s\n",
- config->radius_authprefer == AUTHCHAP ? "CHAP" : "PAP");
+ authtype == AUTHCHAP ? "CHAP" : "PAP");
if (!session[s].mru)
session[s].mru = DEFAULT_MRU;
*l++ = ConfigReq;
*l++ = (time_now % 255) + 1; // 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;
projects / l2tpns.git / blobdiff