// L2TPNS PPP Stuff
-char const *cvs_id_ppp = "$Id: ppp.c,v 1.95 2006/02/17 14:35:54 bodea Exp $";
+char const *cvs_id_ppp = "$Id: ppp.c,v 1.102 2006/08/02 13:35:39 bodea Exp $";
#include <stdio.h>
#include <string.h>
#include "cluster.h"
extern tunnelt *tunnel;
+extern bundlet *bundle;
+extern fragmentationt *frag;
extern sessiont *session;
extern radiust *radius;
extern int tunfd;
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);
// 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;
}
// respond now, either no RADIUS available or already authenticated
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
{
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)
+ if (session[s].ppp.phase != Authenticate)
{
- LOG(3, s, t, "Unexpected CHAP message\n");
+ LOG(2, s, t, "CHAP ignored in %s phase\n", ppp_phase(session[s].ppp.phase));
return;
}
- if (session[s].ppp.phase != Authenticate)
+ r = sess_local[s].radius;
+ if (!r)
{
- LOG(2, s, t, "CHAP ignored in %s phase\n", ppp_phase(session[s].ppp.phase));
+ 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;
}
{
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
{
- // 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);
+ if (session[s].bundle && bundle[session[s].bundle].num_of_links > 1)
+ {
+ 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);
+ session[s].ip = session[first_ses].ip;
+ session[s].dns1 = session[first_ses].dns1;
+ session[s].dns2 = session[first_ses].dns2;
+ session[s].session_timeout = session[first_ses].session_timeout;
+ ipcp_open(s, t);
+ }
else
- change_state(s, ipv6cp, Closed);
+ {
+ // 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);
+ }
}
}
{
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;
if (*nak_sent >= config->ppp_max_failure)
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;
l += 4;
if (l > mru) l = mru;
- q = makeppp(buf, size, 0, 0, s, t, proto);
+ q = makeppp(buf, size, 0, 0, s, t, proto, 0, 0, 0);
if (!q) return;
*q = CodeRej;
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)
{
if (mru >= MINMTU)
{
session[s].mru = mru;
- cluster_send_session(s);
+ changed++;
break;
}
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_conf_rej(s, b, sizeof(b), PPPLCP, &response, q, p, o);
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 1: // Maximum-Receive-Unit
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);
}
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",
break;
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);
- if (!session[s].magic) session[s].magic = time_now; // Netgear DG814 sends zero??
- cluster_send_session(s);
- break;
+ 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");
}
- // ConfigRej: fallthrough
+ }
+ 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.", 3, 0);
+ sessionshutdown(s, "Unable to negotiate LCP.", CDN_ADMIN_DISC, TERM_USER_ERROR);
return;
}
x -= 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);
}
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)
{
{
*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));
}
}
+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))
+ {
+ session[s].bundle = i;
+ bundle[i].mrru = session[s].mrru;
+ bundle[i].mssf = session[s].mssf;
+ 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;
+ }
+ }
+ }
+
+ // 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;
+ 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;
+ LOG(3, s, session[s].tunnel, "MPPP: Created a new bundle (%d)\n", b);
+ return b;
+}
+
+static int epdiscmp(epdist ep1, epdist ep2)
+{
+ int ad;
+ if (ep1.length != ep2.length)
+ return 0;
+
+ 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
+ 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)
{
LOG(3, s, t, "IPCP: Opened, session is now active\n");
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);
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;
}
}
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);
+ 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;
+
+ 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, 0, 0, 0);
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);
+ tunnelsend(b, l + (q - b), t); // send it
}
else if (*p != CodeRej)
{
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 if (*p != CodeRej)
{
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
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;
+ uint8_t begin_frame;
+ uint8_t end_frame;
+ uint32_t seq_num;
+ uint32_t offset;
+
+ if (!b)
+ {
+ LOG(3, s, t, "MPPP: Invalid bundle id: 0\n");
+ return;
+ }
+
+ begin_frame = (*p & 0x80);
+ end_frame = (*p & 0x40);
+ if (session[s].mssf)
+ {
+ // Get 12 bit for seq number
+ uint16_t short_seq_num = ntohs((*(uint16_t *) p) & 0xFF0F);
+ uint16_t short_seq_num2 = short_seq_num >> 4;
+ p += 2;
+ l -= 2;
+ seq_num = short_seq_num2;
+ // After this point the pointer should be advanced 2 bytes
+ LOG(3, s, t, "MPPP: 12 bits, sequence number: %d, short1: %d, short2: %d\n",seq_num, short_seq_num, short_seq_num2);
+ }
+ else
+ {
+ // Get 24 bit for seq number
+ p++;
+ seq_num = ntohl((*(uint32_t *) p) & 0xFFFFFF00);
+ seq_num = seq_num >> 8;
+ p += 3;
+ 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);
+ }
+
+ if (seq_num - bundle[b].offset < 0)
+ {
+ bundle[b].offset = 0;
+ bundle[b].pending_frag = 0;
+ }
+
+ offset = bundle[b].offset;
+ if (begin_frame)
+ {
+ // Check for previous non-assembled frames
+ int error = 0;
+ if (bundle[b].pending_frag)
+ {
+ uint32_t fn = bundle[b].seq_num_m - offset;
+ uint16_t cur_len;
+ bundle[b].pending_frag = 0;
+ // Check for array indexes
+ if (fn < 0 || fn > MAXFRAGNUM)
+ {
+ LOG(2, s, t, "ERROR: Index out of range fn:%d, bundle:%d\n",fn,b);
+ return;
+ }
+
+ if (seq_num-offset < 0 || seq_num-offset > MAXFRAGNUM)
+ {
+ LOG(2, s, t, "ERROR: Index out of range fn(last):%d, bundle:%d\n",fn,b);
+ return;
+ }
+ /////////////////////////////////////////////////////
+ cur_len = 4; // This is set to 4 to leave 4 bytes for function processipin
+ for (fn = bundle[b].seq_num_m - offset; fn < seq_num - offset; fn++)
+ {
+ if (!frag[b].fragment[fn].length)
+ {
+ LOG(4, s, t, "MPPP: Found lost fragment while reassembling frame %d in (%d,%d)\n",fn, bundle[b].seq_num_m-offset, seq_num-offset);
+ error = 1;
+ break;
+ }
+
+ if (cur_len + frag[b].fragment[fn].length > MAXETHER)
+ {
+ LOG(2, s, t, "MPPP: ERROR: very long frame after assembling %d\n", frag[b].fragment[fn].length+cur_len);
+ error = 1;
+ break;
+ }
+
+ memcpy(frag[b].reassembled_frame+cur_len, frag[b].fragment[fn].data, frag[b].fragment[fn].length);
+ cur_len += frag[b].fragment[fn].length;
+ frag[b].fragment[fn].length = 0; // Indicates that this fragment has been consumed
+ // This is usefull for compression
+ memset(frag[b].fragment[fn].data, 0, sizeof(frag[b].fragment[fn].data));
+ }
+
+ if (!error)
+ {
+ frag[b].re_frame_len = cur_len;
+ // Process the resassembled frame
+ LOG(4, s, t, "MPPP: Process the reassembled frame, len=%d\n",cur_len);
+ processmpframe(s, t, frag[b].reassembled_frame, frag[b].re_frame_len, 1);
+ // Set reassembled frame length to zero after processing it
+ frag[b].re_frame_len = 0;
+ memset(frag[b].reassembled_frame, 0, sizeof(frag[b].reassembled_frame));
+ }
+ }
+ //////////////////////////////////////////
+ bundle[b].seq_num_m = seq_num;
+ if (end_frame)
+ {
+ // Both bits are set
+ LOG(4, s, t, "MPPP: Both bits are set (Begin and End).\n");
+ processmpframe(s, t, p, l, 0);
+ // The maximum number of fragments is 1500
+ if (seq_num - bundle[b].offset >= 1400)
+ {
+ bundle[b].offset = seq_num;
+ LOG(4, s, t, "MPPP: Setting offset to: %d\n",bundle[b].offset);
+ }
+ }
+ else
+ {
+ bundle[b].pending_frag = 1;
+ // End bit is clear
+ LOG(4, s, t, "MPPP: Push to receive buffer\n");
+ // Push to the receive buffer
+ // Array indexes checking
+ if (seq_num-offset < 0 || seq_num-offset >= MAXFRAGNUM)
+ {
+ LOG(2, s, t, "ERROR: Index out of range, push to receive buffer(1) seq:%d, offset:%d, bundle:%d\n",seq_num,offset,b);
+ return;
+ }
+ // Perform length checking
+ if (l > MAXFRAGLEN)
+ {
+ LOG(2, s, t, "MPPP: ERROR: very long fragment length (1)\n");
+ return;
+ }
+ frag[b].fragment[seq_num - offset].length = l;
+ memcpy(frag[b].fragment[seq_num - offset].data, p, l);
+ }
+ }
+ else
+ {
+ LOG(4, s, t, "MPPP: Push to receive buffer\n");
+ // Push to the receive buffer
+ // Array indexes checking
+ if (seq_num-offset < 0 || seq_num-offset >= MAXFRAGNUM)
+ {
+ LOG(2, s, t, "ERROR: Index out of range, push to receive buffer(2) seq:%d, offset:%d, bundle:%d\n",seq_num,offset,b);
+ return;
+ }
+ // Perform length checking
+ if (l > MAXFRAGLEN)
+ {
+ LOG(2, s, t, "MPPP: ERROR: very long fragment length (2).\n");
+ return;
+ }
+ frag[b].fragment[seq_num - offset].length = l;
+ memcpy(frag[b].fragment[seq_num - offset].data, p, l);
+ }
+}
+
// process IPv6 packet received
//
// This MUST be called with at least 4 byte behind 'p'.
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);
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!!
{
LOG(0, s, t, "makeppp buffer too small for L2TP header (size=%d)\n", size);
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].flags & SESSION_ACFC))
+
+ // 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].flags & SESSION_PFC)
- *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 & 0xFF0F)|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)
{
- LOG(2, s, t, "makeppp would overflow buffer (size=%d, header+payload=%d)\n", size, l + 12);
+ LOG(2, s, t, "makeppp would overflow buffer (size=%d, header+payload=%d)\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
+// 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 (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
{
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");
l += 6;
if (l > mru) l = mru;
- q = makeppp(buf, sizeof(buf), 0, 0, s, t, PPPLCP);
+ q = makeppp(buf, sizeof(buf), 0, 0, s, t, PPPLCP, 0, 0, 0);
if (!q) return;
*q = ProtocolRej;
projects / l2tpns.git / blobdiff