// L2TPNS PPP Stuff
-char const *cvs_id_ppp = "$Id: ppp.c,v 1.34 2004/11/30 00:50:03 bodea Exp $";
-
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <stdlib.h>
+#include <sys/socket.h>
+#include <linux/rtnetlink.h>
+
#include "l2tpns.h"
#include "constants.h"
#include "plugin.h"
#include "tbf.h"
#include "cluster.h"
+#include "l2tplac.h"
+#include "pppoe.h"
+
extern tunnelt *tunnel;
+extern bundlet *bundle;
+extern fragmentationt *frag;
extern sessiont *session;
extern radiust *radius;
extern int tunfd;
extern char hostname[];
-extern u32 eth_tx;
+extern uint32_t eth_tx;
extern time_t time_now;
+extern uint64_t time_now_ms;
extern configt *config;
-static void initccp(tunnelidt t, sessionidt s);
+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(tunnelidt t, sessionidt s, u8 *p, u16 l)
+void processpap(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l)
{
- char user[129];
- char pass[129];
- u16 hl;
+ char user[MAXUSER];
+ char pass[MAXPASS];
+ uint16_t hl;
+ uint16_t r;
- CSTAT(call_processpap);
+ CSTAT(processpap);
LOG_HEX(5, "PAP", p, l);
if (l < 4)
{
LOG(1, s, t, "Short PAP %u bytes\n", l);
STAT(tunnel_rx_errors);
- return ;
+ sessionshutdown(s, "Short PAP packet.", CDN_ADMIN_DISC, TERM_USER_ERROR);
+ return;
}
- if ((hl = ntohs(*(u16 *) (p + 2))) > l)
+ if ((hl = ntohs(*(uint16_t *) (p + 2))) > l)
{
LOG(1, s, t, "Length mismatch PAP %u/%u\n", hl, l);
STAT(tunnel_rx_errors);
- return ;
+ 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);
- return ;
+ sessionshutdown(s, "Unexpected PAP code.", CDN_ADMIN_DISC, TERM_USER_ERROR);
+ return;
+ }
+
+ if (session[s].ppp.phase != Authenticate)
+ {
+ LOG(2, s, t, "PAP ignored in %s phase\n", ppp_phase(session[s].ppp.phase));
+ return;
}
{
- u8 *b = p;
+ uint8_t *b = p;
b += 4;
+ user[0] = pass[0] = 0;
if (*b && *b < sizeof(user))
+ {
memcpy(user, b + 1, *b);
- user[*b] = 0;
- b += 1 + *b;
- if (*b && *b < sizeof(pass))
- memcpy(pass, b + 1, *b);
- pass[*b] = 0;
+ user[*b] = 0;
+ b += 1 + *b;
+ if (*b && *b < sizeof(pass))
+ {
+ memcpy(pass, b + 1, *b);
+ pass[*b] = 0;
+ }
+ }
LOG(3, s, t, "PAP login %s/%s\n", user, pass);
}
- if (session[s].ip || !session[s].radius)
+
+ if ((!config->disable_lac_func) && lac_conf_forwardtoremotelns(s, user))
+ {
+ // Creating a tunnel/session has been started
+ return;
+ }
+
+ if (session[s].ip || !(r = radiusnew(s)))
{
// respond now, either no RADIUS available or already authenticated
- u8 b[MAXCONTROL];
- u8 id = p[1];
- u8 *p = makeppp(b, sizeof(b), 0, 0, t, s, PPPPAP);
+ uint8_t b[MAXETHER];
+ uint8_t id = p[1];
+ uint8_t *p = makeppp(b, sizeof(b), 0, 0, s, t, PPPPAP, 0, 0, 0);
if (!p) return;
if (session[s].ip)
- *p = 2; // ACK
+ *p = 2; // ACK
else
- *p = 3; // cant authorise
+ *p = 3; // cant authorise
p[1] = id;
- *(u16 *) (p + 2) = htons(5); // length
- p[4] = 0; // no message
+ *(uint16_t *) (p + 2) = htons(5); // length
+ p[4] = 0; // no message
+ tunnelsend(b, 5 + (p - b), t); // send it
+
if (session[s].ip)
{
LOG(3, s, t, "Already an IP allocated: %s (%d)\n",
fmtaddr(htonl(session[s].ip), 0), session[s].ip_pool_index);
-
- session[s].flags &= ~SF_IPCP_ACKED;
}
else
{
- LOG(1, s, t, "No radius session available to authenticate session...\n");
+ LOG(1, s, t, "No RADIUS session available to authenticate session...\n");
+ sessionshutdown(s, "No free RADIUS sessions.", CDN_UNAVAILABLE, TERM_SERVICE_UNAVAILABLE);
}
- LOG(3, s, t, "Fallback response to PAP (%s)\n", (session[s].ip) ? "ACK" : "NAK");
- tunnelsend(b, 5 + (p - b), t); // send it
}
else
{
- // set up RADIUS request
- u16 r = session[s].radius;
-
// Run PRE_AUTH plugins
struct param_pre_auth packet = { &tunnel[t], &session[s], strdup(user), strdup(pass), PPPPAP, 1 };
run_plugins(PLUGIN_PRE_AUTH, &packet);
free(packet.password);
radius[r].id = p[1];
- LOG(3, s, t, "Sending login for %s/%s to radius\n", user, pass);
- radiussend(r, RADIUSAUTH);
+ LOG(3, s, t, "Sending login for %s/%s to RADIUS\n", user, pass);
+ if ((session[s].mrru) && (!first_session_in_bundle(s)))
+ radiussend(r, RADIUSJUSTAUTH);
+ else
+ radiussend(r, RADIUSAUTH);
}
}
// Process CHAP messages
-void processchap(tunnelidt t, sessionidt s, u8 *p, u16 l)
+void processchap(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l)
{
- u16 r;
- u16 hl;
+ uint16_t r;
+ uint16_t hl;
- CSTAT(call_processchap);
+ CSTAT(processchap);
LOG_HEX(5, "CHAP", p, l);
- r = session[s].radius;
- if (!r)
- {
- LOG(1, s, t, "Unexpected CHAP message\n");
-
-// FIXME: Need to drop the session here.
-
- STAT(tunnel_rx_errors);
- return;
- }
if (l < 4)
{
LOG(1, s, t, "Short CHAP %u bytes\n", l);
STAT(tunnel_rx_errors);
- return ;
+ sessionshutdown(s, "Short CHAP packet.", CDN_ADMIN_DISC, TERM_USER_ERROR);
+ return;
}
- if ((hl = ntohs(*(u16 *) (p + 2))) > l)
+ 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.", 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.", CDN_ADMIN_DISC, TERM_USER_ERROR);
+ return;
+ }
+
+ if (session[s].ppp.phase != Authenticate)
+ {
+ LOG(2, s, t, "CHAP ignored in %s phase\n", ppp_phase(session[s].ppp.phase));
+ 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);
- return ;
+ sessionshutdown(s, "Unexpected CHAP response ID.", CDN_ADMIN_DISC, TERM_USER_ERROR);
+ 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.", CDN_ADMIN_DISC, TERM_USER_ERROR);
+ 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.", CDN_ADMIN_DISC, TERM_USER_ERROR);
+ return;
}
// Run PRE_AUTH plugins
packet.username = calloc(l + 1, 1);
memcpy(packet.username, p, l);
+ if ((!config->disable_lac_func) && lac_conf_forwardtoremotelns(s, packet.username))
+ {
+ free(packet.username);
+ free(packet.password);
+ // Creating a tunnel/session has been started
+ return;
+ }
+
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 char *ppp_lcp_types[] = {
- NULL,
- "ConfigReq",
- "ConfigAck",
- "ConfigNak",
- "ConfigRej",
- "TerminateReq",
- "TerminateAck",
- "CodeRej",
- "ProtocolRej",
- "EchoReq",
- "EchoReply",
- "DiscardRequest",
- "IdentRequest",
-};
-
-static void dumplcp(u8 *p, int l)
+static void dumplcp(uint8_t *p, int l)
{
int x = l - 4;
- u8 *o = (p + 4);
+ uint8_t *o = (p + 4);
LOG_HEX(5, "PPP LCP Packet", p, l);
- LOG(4, 0, 0, "PPP LCP Packet type %d (%s len %d)\n", *p, ppp_lcp_types[(int)*p], ntohs( ((u16 *) p)[1]) );
+ LOG(4, 0, 0, "PPP LCP Packet type %d (%s len %d)\n", *p, ppp_code((int)*p), ntohs( ((uint16_t *) p)[1]) );
LOG(4, 0, 0, "Length: %d\n", l);
if (*p != ConfigReq && *p != ConfigRej && *p != ConfigAck)
return;
{
case 1: // Maximum-Receive-Unit
if (length == 4)
- LOG(4, 0, 0, " %s %d\n", lcp_types[type], ntohs(*(u16 *)(o + 2)));
+ LOG(4, 0, 0, " %s %d\n", ppp_lcp_option(type), ntohs(*(uint16_t *)(o + 2)));
else
- LOG(4, 0, 0, " %s odd length %d\n", lcp_types[type], length);
+ LOG(4, 0, 0, " %s odd length %d\n", ppp_lcp_option(type), length);
break;
case 2: // Async-Control-Character-Map
if (length == 6)
{
- u32 asyncmap = ntohl(*(u32 *)(o + 2));
- LOG(4, 0, 0, " %s %x\n", lcp_types[type], asyncmap);
+ uint32_t asyncmap = ntohl(*(uint32_t *)(o + 2));
+ LOG(4, 0, 0, " %s %x\n", ppp_lcp_option(type), asyncmap);
}
else
- LOG(4, 0, 0, " %s odd length %d\n", lcp_types[type], length);
+ LOG(4, 0, 0, " %s odd length %d\n", ppp_lcp_option(type), length);
break;
case 3: // Authentication-Protocol
if (length == 4)
{
- int proto = ntohs(*(u16 *)(o + 2));
- LOG(4, 0, 0, " %s 0x%x (%s)\n", lcp_types[type], proto,
- proto == PPPCHAP ? "CHAP" :
- proto == PPPPAP ? "PAP" : "UNKNOWN");
+ int proto = ntohs(*(uint16_t *)(o + 2));
+ LOG(4, 0, 0, " %s 0x%x (%s)\n", ppp_lcp_option(type), proto,
+ proto == PPPPAP ? "PAP" : "UNSUPPORTED");
+ }
+ else if (length == 5)
+ {
+ int proto = ntohs(*(uint16_t *)(o + 2));
+ 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
- LOG(4, 0, 0, " %s odd length %d\n", lcp_types[type], length);
+ LOG(4, 0, 0, " %s odd length %d\n", ppp_lcp_option(type), length);
break;
case 4: // Quality-Protocol
{
- u32 qp = ntohl(*(u32 *)(o + 2));
- LOG(4, 0, 0, " %s %x\n", lcp_types[type], qp);
+ uint32_t qp = ntohl(*(uint32_t *)(o + 2));
+ LOG(4, 0, 0, " %s %x\n", ppp_lcp_option(type), qp);
}
break;
case 5: // Magic-Number
if (length == 6)
{
- u32 magicno = ntohl(*(u32 *)(o + 2));
- LOG(4, 0, 0, " %s %x\n", lcp_types[type], magicno);
+ uint32_t magicno = ntohl(*(uint32_t *)(o + 2));
+ LOG(4, 0, 0, " %s %x\n", ppp_lcp_option(type), magicno);
}
else
- LOG(4, 0, 0, " %s odd length %d\n", lcp_types[type], length);
+ LOG(4, 0, 0, " %s odd length %d\n", ppp_lcp_option(type), length);
break;
case 7: // Protocol-Field-Compression
case 8: // Address-And-Control-Field-Compression
- LOG(4, 0, 0, " %s\n", lcp_types[type]);
+ LOG(4, 0, 0, " %s\n", ppp_lcp_option(type));
break;
default:
LOG(2, 0, 0, " Unknown PPP LCP Option type %d\n", type);
}
}
+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(s, t);
+ }
+ else
+ {
+ 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);
+ }
+ 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);
+ }
+ }
+}
+
+void lcp_restart(sessionidt s)
+{
+ session[s].ppp.phase = Establish;
+ // This-Layer-Down
+ change_state(s, ipcp, Dead);
+ change_state(s, ipv6cp, Dead);
+ change_state(s, ccp, Dead);
+}
+
+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, 0, 0, 0);
+ if (!queued)
+ return 0;
+
+ *queued = ConfigRej;
+ queued += 4;
+ }
+
+ if ((queued - buf + option[1]) > blen)
+ {
+ LOG(2, s, session[s].tunnel, "PPP overflow for ConfigRej (proto %u, option %u).\n", mtype, *option);
+ return 0;
+ }
+
+ memcpy(queued, option, option[1]);
+ return queued + option[1];
+}
+
+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)
+{
+ int *nak_sent;
+ switch (mtype)
+ {
+ case PPPLCP: nak_sent = &sess_local[s].lcp.nak_sent; break;
+ case PPPIPCP: nak_sent = &sess_local[s].ipcp.nak_sent; break;
+ case PPPIPV6CP: nak_sent = &sess_local[s].ipv6cp.nak_sent; break;
+ default: return 0; // ?
+ }
+
+ if (*response && **response != ConfigNak)
+ {
+ if (*nak_sent < config->ppp_max_failure) // reject queued
+ return queued;
+
+ return ppp_conf_rej(s, buf, blen, mtype, response, 0, packet, option);
+ }
+
+ if (!*response)
+ {
+ 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, 0, 0, 0);
+ if (!queued)
+ return 0;
+
+ (*nak_sent)++;
+ *queued = ConfigNak;
+ queued += 4;
+ }
+
+ if ((queued - buf + vlen + 2) > blen)
+ {
+ LOG(2, s, session[s].tunnel, "PPP overflow for ConfigNak (proto %u, option %u).\n", mtype, *option);
+ return 0;
+ }
+
+ *queued++ = *option;
+ *queued++ = vlen + 2;
+ memcpy(queued, value, vlen);
+ 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(tunnelidt t, sessionidt s, u8 *p, u16 l)
+void processlcp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l)
{
- u8 b[MAXCONTROL];
- u8 *q = NULL;
- u32 magicno = 0;
- u16 hl;
+ uint8_t b[MAXETHER];
+ uint8_t *q = NULL;
+ uint16_t hl;
- CSTAT(call_processlcp);
+ CSTAT(processlcp);
LOG_HEX(5, "LCP", p, l);
if (l < 4)
return ;
}
- if ((hl = ntohs(*(u16 *) (p + 2))) > l)
+ if ((hl = ntohs(*(uint16_t *) (p + 2))) > l)
{
LOG(1, s, t, "Length mismatch LCP %u/%u\n", hl, l);
STAT(tunnel_rx_errors);
}
l = hl;
+ 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)
- {
- LOG(3, s, t, "LCP: Discarding ConfigAck\n");
- session[s].flags |= SF_LCP_ACKED;
- }
- else if (*p == ConfigReq)
{
int x = l - 4;
- u8 *o = (p + 4);
- u8 *response = 0;
-
- LOG(3, s, t, "LCP: ConfigReq (%d bytes)...\n", l);
- if (config->debug > 3) dumplcp(p, l);
+ uint8_t *o = (p + 4);
+ int authtype = 0;
while (x > 2)
{
if (length == 0 || type == 0 || x < length) break;
switch (type)
{
- case 1: // Maximum-Receive-Unit
- session[s].mru = ntohs(*(u16 *)(o + 2));
+ case 3: // Authentication-Protocol
+ {
+ int proto = ntohs(*(uint16_t *)(o + 2));
+ if (proto == PPPPAP)
+ authtype = AUTHPAP;
+ else if (proto == PPPCHAP && *(o + 4) == 5)
+ authtype = AUTHCHAP;
+ }
+
break;
+ }
+ x -= length;
+ o += length;
+ }
- case 2: // Async-Control-Character-Map
- if (!ntohl(*(u32 *)(o + 2))) // all bits zero is OK
- break;
+ if (!session[s].ip && authtype)
+ sess_local[s].lcp_authtype = authtype;
- if (response && *response != ConfigNak) // rej already queued
- break;
+ switch (session[s].ppp.lcp)
+ {
+ case RequestSent:
+ initialise_restart_count(s, lcp);
+ change_state(s, lcp, AckReceived);
+ break;
+
+ case AckReceived:
+ case Opened:
+ LOG(2, s, t, "LCP: ConfigAck in state %s? Sending ConfigReq\n", ppp_state(session[s].ppp.lcp));
+ if (session[s].ppp.lcp == Opened)
+ lcp_restart(s);
+
+ sendlcp(s, t);
+ change_state(s, lcp, RequestSent);
+ break;
+
+ case AckSent:
+ lcp_open(s, t);
+ break;
+
+ default:
+ LOG(2, s, t, "LCP: ignoring %s in state %s\n", ppp_code(*p), ppp_state(session[s].ppp.lcp));
+ }
+ }
+ else if (*p == ConfigReq)
+ {
+ int x = l - 4;
+ uint8_t *o = (p + 4);
+ uint8_t *response = 0;
+ static uint8_t asyncmap[4] = { 0, 0, 0, 0 }; // all zero
+ static uint8_t authproto[5];
+ int changed = 0;
- LOG(2, s, t, " Remote requesting asyncmap. Rejecting.\n");
- if (!response)
+ 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
{
- q = response = makeppp(b, sizeof(b), p, 2, t, s, PPPLCP);
- if (!q) break;
- *q = ConfigNak;
- q += 4;
+ 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;
- if ((q - b + 11) > sizeof(b))
- {
- LOG(2, s, t, "LCP overflow for asyncmap ConfigNak.\n");
+ case 2: // Async-Control-Character-Map
+ if (!ntohl(*(uint32_t *)(o + 2))) // all bits zero is OK
break;
- }
- *q++ = type;
- *q++ = 6;
- memset(q, 0, 4); // asyncmap 0
- q += 4;
- *((u16 *) (response + 2)) = q - response; // LCP header length
+ 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
{
- int proto = ntohs(*(u16 *)(o + 2));
+ int proto = ntohs(*(uint16_t *)(o + 2));
char proto_name[] = "0x0000";
+ int alen;
+
if (proto == PPPPAP)
- break;
+ {
+ if (config->radius_authtypes & AUTHPAP)
+ {
+ sess_local[s].lcp_authtype = AUTHPAP;
+ break;
+ }
- if (response && *response != ConfigNak) // rej already queued
- break;
+ strcpy(proto_name, "PAP");
+ }
+ else if (proto == PPPCHAP)
+ {
+ if (config->radius_authtypes & AUTHCHAP
+ && *(o + 4) == 5) // MD5
+ {
+ sess_local[s].lcp_authtype = AUTHCHAP;
+ break;
+ }
- if (proto == PPPCHAP)
strcpy(proto_name, "CHAP");
+ }
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);
- if (!response)
- {
- q = response = makeppp(b, sizeof(b), p, 2, t, s, PPPLCP);
- if (!q) break;
- *q = ConfigNak;
- q += 4;
- }
+ alen = add_lcp_auth(authproto, sizeof(authproto), config->radius_authprefer);
+ if (alen < 2) break; // paranoia
- if ((q - b + length) > sizeof(b))
+ 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)
{
- LOG(2, s, t, "LCP overflow for %s ConfigNak.\n", proto_name);
- break;
+ // alternate type
+ alen = add_lcp_auth(authproto, sizeof(authproto), config->radius_authtypes & ~config->radius_authprefer);
+ if (alen < 2) break;
+ q = ppp_conf_nak(s, b, sizeof(b), PPPLCP, &response, q, p, o, authproto + 2, alen - 2);
}
- memcpy(q, o, length);
- *(u16 *)(q += 2) = htons(PPPPAP); // NAK -> Use PAP instead
- q += length;
- *((u16 *) (response + 2)) = q - response;
+ break;
}
break;
- case 5: // Magic-Number
- magicno = ntohl(*(u32 *)(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);
- if (!response || *response != ConfigRej) // drop nak in favour of rej
+ case 17: // Multilink Max-Receive-Reconstructed-Unit
{
- q = response = makeppp(b, sizeof(b), p, 2, t, s, PPPLCP);
- if (!q) break;
- *q = ConfigRej;
- q += 4;
+ 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);
}
-
- if ((q - b + length) > sizeof(b))
+ break;
+
+ case 18: // Multilink Short Sequence Number Header Format
{
- LOG(2, s, t, "LCP overflow for ConfigRej (type=%d).\n", type);
- break;
+ 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;
- memcpy(q, o, length);
- q += length;
- *((u16 *) (response + 2)) = q - response; // LCP header length
+ 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);
}
x -= length;
o += length;
}
- if (!response)
+ if (changed)
+ cluster_send_session(s);
+
+ if (response)
{
- // Send back a ConfigAck
- q = makeppp(b, sizeof(b), p, l, t, s, PPPLCP);
- if (!q) return;
- response = *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, s, t, PPPLCP, 0, 0, 0);
+ if (!response) return;
+ *response = ConfigAck;
}
- LOG(3, s, t, "Sending %s\n", ppp_lcp_types[response]);
- tunnelsend(b, l + (q - b), t);
+ switch (session[s].ppp.lcp)
+ {
+ case Closed:
+ 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);
+ break;
- if (!(session[s].flags & SF_LCP_ACKED))
- initlcp(t, s);
- }
- else if (*p == ConfigNak)
- {
- LOG(1, s, t, "Remote end sent a ConfigNak. Ignoring\n");
- if (config->debug > 3) dumplcp(p, l);
- return ;
- }
- 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);
- if (!q) return;
- tunnelsend(b, l + (q - b), t); // send it
- sessionshutdown(s, "Remote end closed connection.");
- }
- else if (*p == TerminateAck)
- {
- sessionshutdown(s, "Connection closed.");
+ case Stopped:
+ initialise_restart_count(s, lcp);
+ sendlcp(s, t);
+ if (*response == ConfigAck)
+ change_state(s, lcp, AckSent);
+ else
+ change_state(s, lcp, RequestSent);
+
+ break;
+
+ case RequestSent:
+ if (*response == ConfigAck)
+ change_state(s, lcp, AckSent);
+
+ break;
+
+ case AckReceived:
+ if (*response == ConfigAck)
+ lcp_open(s, t);
+
+ break;
+
+ case Opened:
+ lcp_restart(s);
+ sendlcp(s, t);
+ /* fallthrough */
+
+ case AckSent:
+ if (*response == ConfigAck)
+ change_state(s, lcp, AckSent);
+ else
+ change_state(s, lcp, RequestSent);
+
+ 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;
+ }
+
+ 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 == EchoReq)
+ else if (*p == ConfigNak || *p == ConfigRej)
{
- LOG(5, s, t, "LCP: Received EchoReq. Sending EchoReply\n");
- *p = EchoReply; // reply
- *(u32 *) (p + 4) = htonl(session[s].magic); // our magic number
- q = makeppp(b, sizeof(b), p, l, t, s, PPPLCP);
- if (!q) return;
- tunnelsend(b, l + (q - b), t); // send it
- }
- else if (*p == EchoReply)
+ int x = l - 4;
+ uint8_t *o = (p + 4);
+ int authtype = -1;
+
+ 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
+ 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;
+
+ 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 && length > 4 && *(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);
+ }
+ }
+ else
+ {
+ LOG(2, s, t, "LCP: remote rejected auth negotiation\n");
+ authtype = 0; // shutdown
+ }
+
+ 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);
+ 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.", CDN_ADMIN_DISC, TERM_USER_ERROR);
+ return;
+ }
+
+ if (authtype > 0)
+ sess_local[s].lcp_authtype = authtype;
+
+ switch (session[s].ppp.lcp)
+ {
+ case Closed:
+ case Stopped:
+ {
+ 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);
+
+ 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);
+ break;
+
+ case AckReceived:
+ LOG(2, s, t, "LCP: ConfigNak in state %s? Sending ConfigReq\n", ppp_state(session[s].ppp.lcp));
+ sendlcp(s, t);
+ break;
+
+ case Opened:
+ lcp_restart(s);
+ sendlcp(s, t);
+ break;
+
+ default:
+ LOG(2, s, t, "LCP: ignoring %s in state %s\n", ppp_code(*p), ppp_state(session[s].ppp.lcp));
+ return;
+ }
+ }
+ else if (*p == TerminateReq)
{
- // Ignore it, last_packet time is set earlier than this.
+ 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
}
- else if (*p == IdentRequest)
+ else if (*p == ProtocolRej)
{
- *p = CodeRej;
- if (l > MAXCONTROL)
+ 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, "Truncated Ident Packet (length=%d) to 1400 bytes\n", l);
- l = 1400;
+ LOG(3, s, t, "LCP protocol reject: 0x%04X\n", proto);
}
- q = makeppp(b, sizeof(b), p, l, t, s, PPPLCP);
+ }
+ 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, 0, 0, 0);
if (!q) return;
- LOG_HEX(5, "LCPIdentRej", q, l + 4);
- tunnelsend(b, 12 + 4 + l, t);
+
+ 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
+ else if (*p == EchoReply)
{
- LOG(1, s, t, "Unexpected LCP code %d\n", *p);
- STAT(tunnel_rx_errors);
- return ;
+ // Ignore it, last_packet time is set earlier than this.
+ }
+ else if (*p != CodeRej)
+ {
+ ppp_code_rej(s, t, PPPLCP, "LCP", p, l, b, sizeof(b));
}
}
-// find a PPP option, returns point to option, or 0 if not found
-static u8 *findppp(u8 *b, u8 mtype)
+int join_bundle(sessionidt s)
{
- u16 l = ntohs(*(u16 *) (b + 2));
- if (l < 4)
+ // 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;
+ }
+ }
+ }
+
+ // 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;
+}
+
+static int epdiscmp(epdist ep1, epdist ep2)
+{
+ int ad;
+ if (ep1.length != ep2.length)
return 0;
- b += 4;
- l -= 4;
- while (l)
+
+ 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 (l < b[1] || !b[1])
- return 0; // faulty
- if (*b == mtype)
- return b;
- l -= b[1];
- b += b[1];
+ 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)
+{
+ LOG(3, s, t, "IPCP: Opened, session is now active\n");
+
+ change_state(s, ipcp, Opened);
+
+ 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(s, t);
+ change_state(s, ipv6cp, RequestSent);
+ }
+}
+
// Process IPCP messages
-void processipcp(tunnelidt t, sessionidt s, u8 *p, u16 l)
+void processipcp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l)
{
- u16 hl;
+ uint8_t b[MAXETHER];
+ uint8_t *q = 0;
+ uint16_t hl;
- CSTAT(call_processipcp);
+ 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 ;
}
- if ((hl = ntohs(*(u16 *) (p + 2))) > l)
+ if ((hl = ntohs(*(uint16_t *) (p + 2))) > l)
{
LOG(1, s, t, "Length mismatch IPCP %u/%u\n", hl, l);
STAT(tunnel_rx_errors);
}
l = hl;
- if (*p == ConfigAck)
+ if (session[s].ppp.phase < Network)
+ {
+ LOG(2, s, t, "IPCP %s ignored in %s phase\n", ppp_code(*p), ppp_phase(session[s].ppp.phase));
+ return;
+ }
+
+ LOG(3, s, t, "IPCP: recv %s\n", ppp_code(*p));
+
+ if (*p == ConfigAck)
+ {
+ switch (session[s].ppp.ipcp)
+ {
+ case RequestSent:
+ initialise_restart_count(s, ipcp);
+ change_state(s, ipcp, AckReceived);
+ break;
+
+ case AckReceived:
+ case Opened:
+ LOG(2, s, t, "IPCP: ConfigAck in state %s? Sending ConfigReq\n", ppp_state(session[s].ppp.ipcp));
+ sendipcp(s, t);
+ change_state(s, ipcp, RequestSent);
+ break;
+
+ case AckSent:
+ ipcp_open(s, t);
+ break;
+
+ default:
+ LOG(2, s, t, "IPCP: ignoring %s in state %s\n", ppp_code(*p), ppp_state(session[s].ppp.ipcp));
+ }
+ }
+ else if (*p == ConfigReq)
+ {
+ uint8_t *response = 0;
+ uint8_t *o = p + 4;
+ int length = l - 4;
+ int gotip = 0;
+ in_addr_t addr;
+
+ while (length > 2)
+ {
+ if (!o[1] || o[1] > length) return;
+
+ switch (*o)
+ {
+ case 3: // ip address
+ gotip++; // seen address
+ if (o[1] != 6) return;
+
+ addr = htonl(session[s].ip);
+ if (memcmp(o + 2, &addr, (sizeof addr)))
+ {
+ 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.", CDN_ADMIN_DISC, TERM_USER_ERROR);
+ return;
+ }
+ }
+
+ break;
+
+ case 129: // primary DNS
+ if (o[1] != 6) return;
+
+ addr = htonl(session[s].dns1);
+ if (memcmp(o + 2, &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) return;
+
+ addr = htonl(session[s].dns2);
+ if (memcmp(o + 2, &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;
+
+ default:
+ LOG(2, s, t, " Rejecting PPP IPCP Option type %d\n", *o);
+ q = ppp_conf_rej(s, b, sizeof(b), PPPIPCP, &response, q, p, o);
+ if (!q) return;
+ }
+
+ length -= o[1];
+ o += o[1];
+ }
+
+ if (response)
+ {
+ l = q - response; // IPCP packet length
+ *((uint16_t *) (response + 2)) = htons(l); // update header
+ }
+ else if (gotip)
+ {
+ // Send packet back as ConfigAck
+ response = makeppp(b, sizeof(b), p, l, s, t, PPPIPCP, 0, 0, 0);
+ if (!response) return;
+ *response = ConfigAck;
+ }
+ else
+ {
+ LOG(1, s, t, "No IP in IPCP request\n");
+ STAT(tunnel_rx_errors);
+ return;
+ }
+
+ switch (session[s].ppp.ipcp)
+ {
+ case Closed:
+ 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);
+ break;
+
+ case Stopped:
+ initialise_restart_count(s, ipcp);
+ sendipcp(s, t);
+ if (*response == ConfigAck)
+ change_state(s, ipcp, AckSent);
+ else
+ change_state(s, ipcp, RequestSent);
+
+ break;
+
+ case RequestSent:
+ if (*response == ConfigAck)
+ change_state(s, ipcp, AckSent);
+
+ break;
+
+ case AckReceived:
+ if (*response == ConfigAck)
+ ipcp_open(s, t);
+
+ break;
+
+ case Opened:
+ initialise_restart_count(s, ipcp);
+ sendipcp(s, t);
+ /* fallthrough */
+
+ case AckSent:
+ if (*response == ConfigAck)
+ change_state(s, ipcp, AckSent);
+ else
+ change_state(s, ipcp, RequestSent);
+
+ break;
+
+ default:
+ LOG(2, s, t, "IPCP: ignoring %s in state %s\n", ppp_code(*p), ppp_state(session[s].ppp.ipcp));
+ return;
+ }
+
+ LOG(3, s, t, "IPCP: send %s\n", ppp_code(*response));
+ tunnelsend(b, l + (response - b), t);
+ }
+ else if (*p == TerminateReq)
+ {
+ 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); // send it
+ }
+ else if (*p != CodeRej)
+ {
+ ppp_code_rej(s, t, PPPIPCP, "IPCP", p, l, b, sizeof(b));
+ }
+}
+
+static void ipv6cp_open(sessionidt s, tunnelidt t)
+{
+ LOG(3, s, t, "IPV6CP: Opened\n");
+
+ change_state(s, ipv6cp, Opened);
+ if (session[s].ipv6prefixlen)
+ route6set(s, session[s].ipv6route, session[s].ipv6prefixlen, 1);
+
+ // Send an initial RA (TODO: Should we send these regularly?)
+ send_ipv6_ra(s, t, NULL);
+}
+
+// Process IPV6CP messages
+void processipv6cp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l)
+{
+ uint8_t b[MAXETHER];
+ uint8_t *q = 0;
+ uint16_t hl;
+
+ CSTAT(processipv6cp);
+
+ LOG_HEX(5, "IPV6CP", p, l);
+ if (l < 4)
+ {
+ LOG(1, s, t, "Short IPV6CP %d bytes\n", l);
+ STAT(tunnel_rx_errors);
+ return ;
+ }
+
+ if ((hl = ntohs(*(uint16_t *) (p + 2))) > l)
+ {
+ LOG(1, s, t, "Length mismatch IPV6CP %u/%u\n", hl, l);
+ STAT(tunnel_rx_errors);
+ return ;
+ }
+ l = hl;
+
+ if (session[s].ppp.phase < Network)
+ {
+ LOG(2, s, t, "IPV6CP %s ignored in %s phase\n", ppp_code(*p), ppp_phase(session[s].ppp.phase));
+ return;
+ }
+
+ LOG(3, s, t, "IPV6CP: recv %s\n", ppp_code(*p));
+
+ if (!session[s].ip)
+ {
+ LOG(3, s, t, "IPV6CP: no IPv4 address (IPCP in state %s)\n", ppp_state(session[s].ppp.ipcp));
+ return; // need IPCP to complete...
+ }
+
+ if (*p == ConfigAck)
+ {
+ switch (session[s].ppp.ipv6cp)
+ {
+ case RequestSent:
+ initialise_restart_count(s, ipv6cp);
+ change_state(s, ipv6cp, AckReceived);
+ break;
+
+ case AckReceived:
+ case Opened:
+ LOG(2, s, t, "IPV6CP: ConfigAck in state %s? Sending ConfigReq\n", ppp_state(session[s].ppp.ipv6cp));
+ sendipv6cp(s, t);
+ change_state(s, ipv6cp, RequestSent);
+ break;
+
+ case AckSent:
+ ipv6cp_open(s, t);
+ break;
+
+ default:
+ LOG(2, s, t, "IPV6CP: ignoring %s in state %s\n", ppp_code(*p), ppp_state(session[s].ppp.ipv6cp));
+ }
+ }
+ else if (*p == ConfigReq)
+ {
+ uint8_t *response = 0;
+ uint8_t *o = p + 4;
+ int length = l - 4;
+ int gotip = 0;
+ 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) return;
+
+ ident[0] = htonl(session[s].ip);
+ ident[1] = 0;
+
+ if (memcmp(o + 2, ident, sizeof(ident)))
+ {
+ q = ppp_conf_nak(s, b, sizeof(b), PPPIPV6CP, &response, q, p, o, (uint8_t *)ident, sizeof(ident));
+ if (!q) return;
+ }
+
+ break;
+
+ default:
+ LOG(2, s, t, " Rejecting PPP IPV6CP Option type %d\n", *o);
+ q = ppp_conf_rej(s, b, sizeof(b), PPPIPV6CP, &response, q, p, o);
+ if (!q) return;
+ }
+
+ length -= o[1];
+ o += o[1];
+ }
+
+ if (response)
+ {
+ l = q - response; // IPV6CP packet length
+ *((uint16_t *) (response + 2)) = htons(l); // update header
+ }
+ else if (gotip)
+ {
+ // Send packet back as ConfigAck
+ response = makeppp(b, sizeof(b), p, l, s, t, PPPIPV6CP, 0, 0, 0);
+ if (!response) return;
+ *response = ConfigAck;
+ }
+ else
+ {
+ LOG(1, s, t, "No interface identifier in IPV6CP request\n");
+ STAT(tunnel_rx_errors);
+ return;
+ }
+
+ switch (session[s].ppp.ipv6cp)
+ {
+ case Closed:
+ 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);
+ break;
+
+ case Stopped:
+ initialise_restart_count(s, ipv6cp);
+ sendipv6cp(s, t);
+ if (*response == ConfigAck)
+ change_state(s, ipv6cp, AckSent);
+ else
+ change_state(s, ipv6cp, RequestSent);
+
+ break;
+
+ case RequestSent:
+ if (*response == ConfigAck)
+ change_state(s, ipv6cp, AckSent);
+
+ break;
+
+ case AckReceived:
+ if (*response == ConfigAck)
+ ipv6cp_open(s, t);
+
+ break;
+
+ case Opened:
+ initialise_restart_count(s, ipv6cp);
+ sendipv6cp(s, t);
+ /* fallthrough */
+
+ case AckSent:
+ if (*response == ConfigAck)
+ change_state(s, ipv6cp, AckSent);
+ else
+ change_state(s, ipv6cp, RequestSent);
+
+ break;
+
+ default:
+ LOG(2, s, t, "IPV6CP: ignoring %s in state %s\n", ppp_code(*p), ppp_state(session[s].ppp.ipv6cp));
+ return;
+ }
+
+ LOG(3, s, t, "IPV6CP: send %s\n", ppp_code(*response));
+ tunnelsend(b, l + (response - b), t);
+ }
+ else if (*p == TerminateReq)
+ {
+ 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); // send it
+ }
+ else if (*p != CodeRej)
+ {
+ ppp_code_rej(s, t, PPPIPV6CP, "IPV6CP", p, l, b, sizeof(b));
+ }
+}
+
+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++;
+
+ 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;
+ }
+ }
+}
+
+// process IP packet received
+//
+// This MUST be called with at least 4 byte behind 'p'.
+// (i.e. this routine writes to p[-4]).
+void processipin(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l)
+{
+ in_addr_t ip;
+
+ CSTAT(processipin);
+
+ 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)
+ {
+ LOG(1, s, t, "IP packet too long %d\n", l);
+ STAT(tunnel_rx_errors);
+ return ;
+ }
+
+ if (session[s].ppp.phase != Network || session[s].ppp.ipcp != Opened)
+ return;
+
+ if (!session[s].bundle || bundle[session[s].bundle].num_of_links < 2) // FIXME:
+ {
+ // no spoof (do sessionbyip to handled statically routed subnets)
+ if (!config->disable_no_spoof && 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;
+
+ 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;
+ }
+
+ // send to ethernet
+ if (tun_write(p, l) < 0)
+ {
+ STAT(tun_tx_errors);
+ LOG(0, s, t, "Error writing %d bytes to TUN device: %s (tunfd=%d, p=%p)\n",
+ l, strerror(errno), tunfd, p);
+
+ return;
+ }
+
+ p += 4;
+ l -= 4;
+
+ if (session[s].snoop_ip && session[s].snoop_port)
+ {
+ // Snooping this session
+ snoop_send_packet(p, l, session[s].snoop_ip, session[s].snoop_port);
+ }
+
+ update_sessions_in_stat(s, l);
+
+ eth_tx += l;
+
+ STAT(tun_tx_packets);
+ 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
{
- // happy with our IPCP
- u16 r = session[s].radius;
- if ((!r || radius[r].state == RADIUSIPCP) && !session[s].walled_garden)
+ Mmin = sess_local[(this_bundle->members[0])].last_seq;
+ for (i = 1; i < this_bundle->num_of_links; i++)
{
- if (!r)
- r = radiusnew(s);
- if (r)
- radiussend(r, RADIUSSTART); // send radius start, having got IPCP at last
+ uint32_t s_seq = sess_local[(this_bundle->members[i])].last_seq;
+ if (s_seq < Mmin)
+ Mmin = s_seq;
}
- session[s].flags |= SF_IPCP_ACKED;
-
- LOG(3, s, t, "IPCP Acked, session is now active\n");
+ this_fragmentation->M = Mmin;
+ }
- // clear LCP_ACKED/CCP_ACKED flag for possible fast renegotiaion for routers
- session[s].flags &= ~(SF_LCP_ACKED|SF_CCP_ACKED);
+ // calculate M offset of the M seq in the bundle
+ int M_offset = (int) (Mmin - this_fragmentation->start_seq);
- return;
- }
- if (*p != ConfigReq)
+ if (M_offset >= MAXFRAGNUM)
{
- LOG(1, s, t, "Unexpected IPCP code %d\n", *p);
- STAT(tunnel_rx_errors);
- return ;
+ // 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\n", Mmin, this_fragmentation->start_seq);
+
+ // 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);
}
- LOG(4, s, t, "IPCP ConfigReq received\n");
- if (!session[s].ip)
+ // discard this fragment if the packet comes before the start sequence
+ if (frag_offset < 0)
{
- LOG(3, s, t, "Waiting on radius reply\n");
- return; // have to wait on RADIUS reply
+ // this packet comes before the next
+ LOG(3, s, t, "MPPP: (COMES BEFORE) the next, seq:%d, begin_seq:%d, size_frag:%d, flags:%02X is LOST\n", seq_num, this_fragmentation->start_seq, l, flags);
+ return;
}
- // form a config reply quoting the IP in the session
+
+ // discard if frag_offset is bigger that the fragmentation buffer size
+ if (frag_offset >= MAXFRAGNUM)
{
- u8 b[MAXCONTROL];
- u8 *i,
- *q;
+ // frag_offset is bigger that the fragmentation buffer size
+ LOG(3, s, t, "MPPP: Index out of range, seq:%d, begin_seq:%d\n", seq_num, this_fragmentation->start_seq);
+ return;
+ }
- q = p + 4;
- i = p + l;
- while (q < i && q[1])
+ //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:%02X is LOST\n",
+ this_frag->seq, frag_index, this_frag->flags);
+
+ 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)
{
- if (*q != 0x81 && *q != 0x83 && *q != 3)
- break;
- q += q[1];
+ // 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:%02X is LOST\n",
+ this_fragmentation->fragment[frag_index_next].seq, frag_index_next,
+ this_fragmentation->fragment[frag_index_next].flags);
+ // 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
}
- if (q < i)
+ }
+
+ // 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)
{
- // reject
- u16 n = 4;
- i = p + l;
- if (!(q = makeppp(b, sizeof(b), p, l, t, s, PPPIPCP)))
- return;
+ // 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:%02X is LOST\n",
+ this_fragmentation->fragment[frag_index_prev].seq, frag_index_prev,
+ this_fragmentation->fragment[frag_index_prev].flags);
- *q = ConfigRej;
- p += 4;
- while (p < i && p[1])
- {
- if (*p != 0x81 && *p != 0x83 && *p != 3)
- {
- LOG(2, s, t, "IPCP reject %d\n", *p);
- memcpy(q + n, p, p[1]);
- n += p[1];
- }
- p += p[1];
- }
- *(u16 *) (q + 2) = htons(n);
- LOG(4, s, t, "Sending ConfigRej\n");
- tunnelsend(b, n + (q - b), t); // send it
+ 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
}
- else
+ }
+
+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)
{
- LOG(4, s, t, "Sending ConfigAck\n");
- *p = ConfigAck;
- if ((i = findppp(p, 0x81))) // Primary DNS address
- {
- if (*(u32 *) (i + 2) != htonl(session[s].dns1))
- {
- *(u32 *) (i + 2) = htonl(session[s].dns1);
- *p = ConfigNak;
- LOG(5, s, t, " DNS1 = %s\n", fmtaddr(session[s].dns1, 0));
- }
- }
- if ((i = findppp(p, 0x83))) // Secondary DNS address (TBA, is it)
+ if (b_seq == this_fragmentation->fragment[begin_index].seq)
{
- if (*(u32 *) (i + 2) != htonl(session[s].dns2))
+ if (this_fragmentation->fragment[begin_index].flags & MP_BEGIN)
{
- *(u32 *) (i + 2) = htonl(session[s].dns2);
- *p = ConfigNak;
- LOG(5, s, t, " DNS2 = %s\n", fmtaddr(session[s].dns2, 0));
+ 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:%02X is LOST\n",
+ this_fragmentation->fragment[end_index].seq, begin_index,
+ this_fragmentation->fragment[end_index].flags);
+ // 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;
}
}
- i = findppp(p, 3); // IP address
- if (!i || i[1] != 6)
- {
- LOG(1, s, t, "No IP in IPCP request\n");
- STAT(tunnel_rx_errors);
- return ;
- }
- if (*(u32 *) (i + 2) != htonl(session[s].ip))
+ else
{
- *(u32 *) (i + 2) = htonl(session[s].ip);
- *p = ConfigNak;
- LOG(4, s, t, " No, a ConfigNak, client is requesting IP - sending %s\n",
- fmtaddr(htonl(session[s].ip), 0));
+ // 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:%02X is LOST\n",
+ this_fragmentation->fragment[begin_index].seq, begin_index,
+ this_fragmentation->fragment[begin_index].flags);
+ // this frag is lost
+ this_fragmentation->fragment[begin_index].length = 0;
+ this_fragmentation->fragment[begin_index].flags = 0;
}
- if (!(q = makeppp(b, sizeof(b), p, l, t, s, PPPIPCP)))
- return;
+ }
+ 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))
+ {
+ LOG(3, this_fragmentation->fragment[begin_index].sid, this_fragmentation->fragment[begin_index].tid,
+ "MPPP: (NOT BEGIN) seq_num:%d frag_index:%d flags:%02X\n",
+ this_fragmentation->fragment[begin_index].seq, begin_index,
+ this_fragmentation->fragment[begin_index].flags);
+ // 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
- tunnelsend(b, l + (q - b), t); // send it
+ 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:%02X is LOST\n",
+ this_fragmentation->fragment[begin_index].seq, begin_index,
+ this_fragmentation->fragment[begin_index].flags);
+ 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 IP packet received
+// process IPv6 packet received
//
// 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, u8 *p, u16 l)
+void processipv6in(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l)
{
- ipt ip;
+ struct in6_addr ip;
+ in_addr_t ipv4;
- CSTAT(call_processipin);
+ CSTAT(processipv6in);
- LOG_HEX(5, "IP", p, l);
+ LOG_HEX(5, "IPv6", p, l);
- ip = ntohl(*(u32 *)(p + 12));
+ ip = *(struct in6_addr *) (p + 8);
+ ipv4 = ntohl(*(uint32_t *)(p + 16));
if (l > MAXETHER)
{
return ;
}
- // no spoof (do sessionbyip to handled statically routed subnets)
- if (ip != session[s].ip && sessionbyip(htonl(ip)) != s)
+ if (session[s].ppp.phase != Network || session[s].ppp.ipv6cp != Opened)
+ return;
+
+ // no spoof
+ if (ipv4 != session[s].ip && memcmp(&config->ipv6_prefix, &ip, 8) && sessionbyipv6(ip) != s)
{
- LOG(5, s, t, "Dropping packet with spoofed IP %s\n", fmtaddr(htonl(ip), 0));
+ char str[INET6_ADDRSTRLEN];
+ LOG(5, s, t, "Dropping packet with spoofed IP %s\n",
+ inet_ntop(AF_INET6, &ip, str, INET6_ADDRSTRLEN));
return;
}
- // run access-list if any
- if (session[s].filter_in && !ip_filter(p, l, session[s].filter_in - 1))
+ // Check if it's a Router Solicition message.
+ if (*(p + 6) == 58 && *(p + 7) == 255 && *(p + 24) == 0xFF && *(p + 25) == 2 &&
+ *(uint32_t *)(p + 26) == 0 && *(uint32_t *)(p + 30) == 0 &&
+ *(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(s, t, &ip);
return;
+ }
// Add on the tun header
p -= 4;
- *(u32 *)p = htonl(0x00000800);
+ *(uint32_t *) p = htonl(PKTIPV6);
l += 4;
- if (session[s].tbf_in && !config->cluster_iam_master) { // Are we throttled and a slave?
- master_throttle_packet(session[s].tbf_in, p, l); // Pass it to the master for handling.
+ // 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;
}
- if (session[s].tbf_in && config->cluster_iam_master) { // Are we throttled and a master?? actually handle the throttled packets.
+ // 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);
return;
}
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_count[s].cin += l - 4;
+ update_sessions_in_stat(s, l);
- session[s].pin++;
- eth_tx += l - 4;
+ eth_tx += l;
STAT(tun_tx_packets);
- INC_STAT(tun_tx_bytes, l - 4);
+ INC_STAT(tun_tx_bytes, l);
}
//
// Helper routine for the TBF filters.
// Used to send queued data in from the user.
//
-void send_ipin(sessionidt s, u8 *buf, int len)
+void send_ipin(sessionidt s, uint8_t *buf, int len)
{
LOG_HEX(5, "IP in throttled", buf, len);
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_count[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);
// Process CCP messages
-void processccp(tunnelidt t, sessionidt s, u8 *p, u16 l)
+void processccp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l)
{
- u8 b[MAXCONTROL];
- u8 *q;
+ uint8_t b[MAXETHER];
+ uint8_t *q;
- CSTAT(call_processccp);
+ CSTAT(processccp);
LOG_HEX(5, "CCP", p, l);
- switch (l > 1 ? *p : 0)
+
+ if (session[s].ppp.phase < Network)
{
- case ConfigAck:
- session[s].flags |= SF_CCP_ACKED;
+ LOG(2, s, t, "CCP %s ignored in %s phase\n", ppp_code(*p), ppp_phase(session[s].ppp.phase));
return;
+ }
- case ConfigReq:
- if (l < 6) // accept no compression
+ if (l < 1)
+ {
+ LOG(1, s, t, "Short CCP packet\n");
+ STAT(tunnel_rx_errors);
+ }
+
+ LOG(4, s, t, "CCP: recv %s\n", ppp_code(*p));
+ if (*p == ConfigAck)
+ {
+ switch (session[s].ppp.ccp)
{
- *p = ConfigAck;
+ case RequestSent:
+ initialise_restart_count(s, ccp);
+ change_state(s, ccp, AckReceived);
+ break;
+
+ case AckReceived:
+ case Opened:
+ LOG(2, s, t, "CCP: ConfigAck in state %s? Sending ConfigReq\n", ppp_state(session[s].ppp.ccp));
+ sendccp(s, t);
+ change_state(s, ccp, RequestSent);
+ break;
+
+ case AckSent:
+ LOG(3, s, t, "CCP: Opened\n");
+ change_state(s, ccp, Opened);
break;
+
+ default:
+ LOG(2, s, t, "CCP: ignoring %s in state %s\n", ppp_code(*p), ppp_state(session[s].ppp.ccp));
}
+ }
+ else if (*p == ConfigReq)
+ {
+ if (l < 6) // accept no compression
+ *p = ConfigAck;
+ else // compression requested--reject
+ *p = ConfigRej;
- // compression requested--reject
- *p = ConfigRej;
+ q = makeppp(b, sizeof(b), p, l, s, t, PPPCCP, 0, 0, 0);
+ if (!q) return;
- // send CCP request for no compression for our end if not negotiated
- if (!(session[s].flags & SF_CCP_ACKED))
- initccp(t, s);
+ switch (session[s].ppp.ccp)
+ {
+ case Closed:
+ 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);
+ break;
- break;
+ case Stopped:
+ initialise_restart_count(s, ccp);
+ sendccp(s, t);
+ if (*q == ConfigAck)
+ change_state(s, ccp, AckSent);
+ else
+ change_state(s, ccp, RequestSent);
- case TerminateReq:
- *p = TerminateAck;
- break;
+ break;
- default:
- if (l > 1)
- LOG(1, s, t, "Unexpected CCP request code %d\n", *p);
- else
- LOG(1, s, t, "Short CCP packet\n");
+ case RequestSent:
+ if (*q == ConfigAck)
+ change_state(s, ccp, AckSent);
- STAT(tunnel_rx_errors);
- return;
- }
+ break;
- if (!(q = makeppp(b, sizeof(b), p, l, t, s, PPPCCP)))
- return;
+ case AckReceived:
+ if (*q == ConfigAck)
+ change_state(s, ccp, Opened);
- tunnelsend(b, l + (q - b), t); // send it
+ break;
+
+ case Opened:
+ initialise_restart_count(s, ccp);
+ sendccp(s, t);
+ /* fallthrough */
+
+ case AckSent:
+ if (*q == ConfigAck)
+ change_state(s, ccp, AckSent);
+ else
+ change_state(s, ccp, RequestSent);
+
+ break;
+
+ default:
+ LOG(2, s, t, "CCP: ignoring %s in state %s\n", ppp_code(*p), ppp_state(session[s].ppp.ccp));
+ return;
+ }
+
+ 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, 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 if (*p != CodeRej)
+ {
+ ppp_code_rej(s, t, PPPCCP, "CCP", p, l, b, sizeof(b));
+ }
}
-// send a CHAP PP packet
-void sendchap(tunnelidt t, sessionidt s)
+// send a CHAP challenge
+void sendchap(sessionidt s, tunnelidt t)
{
- u8 b[MAXCONTROL];
- u16 r = session[s].radius;
- u8 *q;
+ uint8_t b[MAXETHER];
+ uint16_t r;
+ uint8_t *q;
- CSTAT(call_sendchap);
+ CSTAT(sendchap);
+ r = radiusnew(s);
if (!r)
{
LOG(1, s, t, "No RADIUS to send challenge\n");
STAT(tunnel_tx_errors);
- return ;
+ return;
}
+
LOG(1, s, t, "Send CHAP challenge\n");
- {
- // new challenge
- int n;
- for (n = 0; n < 15; n++)
- radius[r].auth[n] = rand();
- }
+
radius[r].chap = 1; // CHAP not PAP
radius[r].id++;
if (radius[r].state != RADIUSCHAP)
radius[r].try = 0;
+
radius[r].state = RADIUSCHAP;
radius[r].retry = backoff(radius[r].try++);
if (radius[r].try > 5)
{
- sessionshutdown(s, "Timeout CHAP");
+ 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, 0, 0, 0);
if (!q) return;
*q = 1; // challenge
q[1] = radius[r].id; // ID
- q[4] = 16; // length
+ q[4] = 16; // value size (size of challenge)
memcpy(q + 5, radius[r].auth, 16); // challenge
- strcpy(q + 21, hostname); // our name
- *(u16 *) (q + 2) = htons(strlen(hostname) + 21); // length
+ strcpy((char *) q + 21, hostname); // our name
+ *(uint16_t *) (q + 2) = htons(strlen(hostname) + 21); // length
tunnelsend(b, strlen(hostname) + 21 + (q - b), t); // send it
}
// fill in a L2TP message with a PPP frame,
-// copies existing PPP message and changes magic number if seen
// returns start of PPP frame
-u8 *makeppp(u8 *b, int size, u8 *p, int l, tunnelidt t, sessionidt s, u16 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 (t == TUNNEL_ID_PPPOE)
+ {
+ return pppoe_makeppp(b, size, p, l, s, t, mtype, prio, bid, mp_bits);
+ }
+
+ 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;
}
- *(u16 *) (b + 0) = htons(0x0002); // L2TP with no options
- *(u16 *) (b + 2) = htons(tunnel[t].far); // tunnel
- *(u16 *) (b + 4) = htons(session[s].far); // session
+ 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))
{
- *(u16 *) b = htons(0xFF03); // HDLC header
+ *(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
{
- *(u16 *) 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 b;
}
-// Send initial LCP ConfigReq for PAP, set magic no.
-void initlcp(tunnelidt t, sessionidt s)
+// fill in a L2TP message with a PPP frame,
+// returns start of PPP frame
+//(note: THIS ROUTINE CAN WRITES TO p[-28]).
+uint8_t *opt_makeppp(uint8_t *p, int l, sessionidt s, tunnelidt t, uint16_t mtype, uint8_t prio, bundleidt bid, uint8_t mp_bits)
+{
+ uint16_t hdr = 0x0002; // L2TP with no options
+ uint16_t type = mtype;
+ uint8_t *b = p;
+
+ if (t == TUNNEL_ID_PPPOE)
+ {
+ return opt_pppoe_makeppp(p, l, s, t, mtype, prio, bid, mp_bits);
+ }
+
+ // 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 (bid)
+ {
+ // Add the message type if this fragment has the begin bit set
+ if (mp_bits & MP_BEGIN)
+ {
+ b -= 2;
+ *(uint16_t *) b = htons(mtype); // Message type
+ }
+
+ // Set the sequence number and (B)egin (E)nd flags
+ if (session[s].mssf)
+ {
+ // Set the multilink bits
+ uint16_t bits_send = mp_bits;
+ b -= 2;
+ *(uint16_t *) b = htons((bundle[bid].seq_num_t & 0x0FFF)|bits_send);
+ }
+ else
+ {
+ b -= 4;
+ *(uint32_t *) b = htonl(bundle[bid].seq_num_t);
+ // Set the multilink bits
+ *b = mp_bits;
+ }
+
+ bundle[bid].seq_num_t++;
+ }
+
+ if (type < 0x100 && session[s].flags & SESSION_PFC)
+ {
+ b--;
+ *b = type;
+ }
+ else
+ {
+ b -= 2;
+ *(uint16_t *) b = htons(type);
+ }
+
+ if (type == PPPLCP || !(session[s].flags & SESSION_ACFC))
+ {
+ b -= 2;
+ *(uint16_t *) b = htons(0xFF03); // HDLC header
+ }
+
+ if (prio) hdr |= 0x0100; // set priority bit
+ b -= 2;
+ *(uint16_t *) b = htons(session[s].far); // session
+ b -= 2;
+ *(uint16_t *) b = htons(tunnel[t].far); // tunnel
+ b -= 2;
+ *(uint16_t *) b = htons(hdr);
+
+ return b;
+}
+
+static int add_lcp_auth(uint8_t *b, int size, int authtype)
+{
+ int len = 0;
+ if ((authtype == AUTHCHAP && size < 5) || size < 4)
+ return 0;
+
+ *b++ = 3; // Authentication-Protocol
+ if (authtype == AUTHCHAP)
+ {
+ len = *b++ = 5; // length
+ *(uint16_t *) b = htons(PPPCHAP); b += 2;
+ *b++ = 5; // MD5
+ }
+ else if (authtype == AUTHPAP)
+ {
+ len = *b++ = 4; // length
+ *(uint16_t *) b = htons(PPPPAP); b += 2;
+ }
+ else
+ {
+ LOG(0, 0, 0, "add_lcp_auth called with unsupported auth type %d\n", authtype);
+ }
+
+ return len;
+}
+
+// Send LCP ConfigReq for MRU, authentication type and magic no
+void sendlcp(sessionidt s, tunnelidt t)
{
- char b[500], *q;
+ 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, 0, 0, 0)))
return;
- LOG(4, s, t, "Sending LCP ConfigReq for PAP\n");
- *q = ConfigReq;
- *(u8 *)(q + 1) = (time_now % 255) + 1; // ID
- *(u16 *)(q + 2) = htons(14); // Length
- *(u8 *)(q + 4) = 5;
- *(u8 *)(q + 5) = 6;
- *(u32 *)(q + 6) = htonl(session[s].magic);
- *(u8 *)(q + 10) = 3;
- *(u8 *)(q + 11) = 4;
- *(u16 *)(q + 12) = htons(PPPPAP); // PAP
-
- LOG_HEX(5, "PPPLCP", q, 14);
- tunnelsend(b, (q - b) + 14, t);
+ LOG(3, s, t, "LCP: send ConfigReq%s%s%s including MP options\n",
+ authtype ? " (" : "",
+ authtype ? (authtype == AUTHCHAP ? "CHAP" : "PAP") : "",
+ authtype ? ")" : "");
+
+ l = q;
+ *l++ = ConfigReq;
+ *l++ = ++sess_local[s].lcp_ident; // ID
+
+ l += 2; //Save space for length
+
+ 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);
+
+ 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
+
+ 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
-static void initccp(tunnelidt t, sessionidt s)
+void sendccp(sessionidt s, tunnelidt t)
{
- char b[500], *q;
+ 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, 0, 0, 0)))
return;
- LOG(4, s, t, "Sending CCP ConfigReq for no compression\n");
+ LOG(3, s, t, "CCP: send ConfigReq (no compression)\n");
+
*q = ConfigReq;
- *(u8 *)(q + 1) = (time_now % 255) + 1; // ID
- *(u16 *)(q + 2) = htons(4); // Length
+ *(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