// L2TPNS PPP Stuff
-char const *cvs_id_ppp = "$Id: ppp.c,v 1.8 2004/07/11 07:57:35 bodea Exp $";
+char const *cvs_id_ppp = "$Id: ppp.c,v 1.79 2005/08/31 12:41:09 bodea Exp $";
#include <stdio.h>
#include <string.h>
extern radiust *radius;
extern int tunfd;
extern char hostname[];
-extern u32 eth_tx;
+extern uint32_t eth_tx;
extern time_t time_now;
-extern struct configt *config;
+extern configt *config;
+
+static int add_lcp_auth(uint8_t *b, int size, int authtype);
// 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];
-
+ char user[MAXUSER];
+ char pass[MAXPASS];
+ uint16_t hl;
+ uint16_t r;
- CSTAT(call_processpap);
+ CSTAT(processpap);
- log_hex(5, "PAP", p, l);
+ LOG_HEX(5, "PAP", p, l);
if (l < 4)
{
- log(1, 0, s, t, "Short PAP %u bytes\n", l);
+ LOG(1, s, t, "Short PAP %u bytes\n", l);
STAT(tunnel_rx_errors);
- return ;
+ sessionshutdown(s, "Short PAP packet.", 3, 0);
+ return;
}
- if (*p != 1)
+
+ if ((hl = ntohs(*(uint16_t *) (p + 2))) > l)
{
- log(1, 0, s, t, "Unexpected PAP code %d\n", *p);
+ LOG(1, s, t, "Length mismatch PAP %u/%u\n", hl, l);
STAT(tunnel_rx_errors);
- return ;
+ sessionshutdown(s, "PAP length mismatch.", 3, 0);
+ return;
}
- if (ntohs(*(u16 *) (p + 2)) > l)
+ l = hl;
+
+ if (*p != 1)
{
- log(1, 0, s, t, "Length mismatch PAP %d/%d\n", ntohs(*(u16 *) (p + 2)), l);
+ LOG(1, s, t, "Unexpected PAP code %d\n", *p);
STAT(tunnel_rx_errors);
- return ;
+ sessionshutdown(s, "Unexpected PAP code.", 3, 0);
+ 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;
- log(3, 0, s, t, "PAP login %s/%s\n", user, pass);
+ 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 (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);
- if (!p) { // Failed to make ppp header!
- log(1,0,0,0, "Failed to make PPP header in process pap!\n");
- return;
- }
+ uint8_t b[MAXETHER];
+ uint8_t id = p[1];
+ uint8_t *p = makeppp(b, sizeof(b), 0, 0, s, t, PPPPAP);
+ 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, session[s].ip, s, t, "%d Already an IP allocated: %s (%d)\n", getpid(), inet_toa(htonl(session[s].ip)), session[s].ip_pool_index);
+ LOG(3, s, t, "Already an IP allocated: %s (%d)\n",
+ fmtaddr(htonl(session[s].ip), 0), session[s].ip_pool_index);
}
else
{
- log(1, 0, 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.", 4, 0);
}
- log(3, 0, 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);
if (!packet.continue_auth)
{
- log(3, 0, s, t, "A plugin rejected PRE_AUTH\n");
+ LOG(3, s, t, "A plugin rejected PRE_AUTH\n");
if (packet.username) free(packet.username);
if (packet.password) free(packet.password);
return;
free(packet.password);
radius[r].id = p[1];
- log(3, 0, s, t, "Sending login for %s/%s to radius\n", user, pass);
+ LOG(3, s, t, "Sending login for %s/%s to RADIUS\n", user, pass);
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 len;
+ uint16_t r;
+ uint16_t hl;
+ CSTAT(processchap);
- CSTAT(call_processchap);
+ LOG_HEX(5, "CHAP", p, l);
- log_hex(5, "CHAP", p, l);
- r = session[s].radius;
- if (!r)
+ if (l < 4)
{
- log(1, 0, s, t, "Unexpected CHAP message\n");
-
-// FIXME: Need to drop the session here.
+ LOG(1, s, t, "Short CHAP %u bytes\n", l);
+ STAT(tunnel_rx_errors);
+ sessionshutdown(s, "Short CHAP packet.", 3, 0);
+ return;
+ }
+ if ((hl = ntohs(*(uint16_t *) (p + 2))) > l)
+ {
+ LOG(1, s, t, "Length mismatch CHAP %u/%u\n", hl, l);
STAT(tunnel_rx_errors);
+ sessionshutdown(s, "CHAP length mismatch.", 3, 0);
return;
}
+ l = hl;
+
if (*p != 2)
{
- log(1, 0, s, t, "Unexpected CHAP response code %d\n", *p);
+ LOG(1, s, t, "Unexpected CHAP response code %d\n", *p);
STAT(tunnel_rx_errors);
+ sessionshutdown(s, "CHAP length mismatch.", 3, 0);
return;
}
- if (p[1] != radius[r].id)
+
+ r = sess_local[s].radius;
+ if (!r)
{
- log(1, 0, s, t, "Wrong CHAP response ID %d (should be %d) (%d)\n", p[1], radius[r].id, r);
- STAT(tunnel_rx_errors);
- return ;
+ LOG(3, s, t, "Unexpected CHAP message\n");
+ return;
+ }
+
+ if (session[s].ppp.phase != Authenticate)
+ {
+ LOG(2, s, t, "CHAP ignored in %s phase\n", ppp_phase(session[s].ppp.phase));
+ return;
}
- len = ntohs(*(u16 *) (p + 2));
- if (len > l)
+
+ if (p[1] != radius[r].id)
{
- log(1, 0, s, t, "Bad CHAP length %d\n", len);
+ LOG(1, s, t, "Wrong CHAP response ID %d (should be %d) (%d)\n", p[1], radius[r].id, r);
STAT(tunnel_rx_errors);
- return ;
+ sessionshutdown(s, "Unexpected CHAP response ID.", 3, 0);
+ return;
}
- if (p[4] != 16)
+
+ if (l < 5 || p[4] != 16)
{
- log(1, 0, s, t, "Bad CHAP response length %d\n", p[4]);
+ LOG(1, s, t, "Bad CHAP response length %d\n", l < 5 ? -1 : p[4]);
STAT(tunnel_rx_errors);
- return ;
+ sessionshutdown(s, "Bad CHAP response length.", 3, 0);
+ return;
}
- if (len - 21 >= sizeof(session[s].user))
+
+ l -= 5;
+ p += 5;
+ if (l < 16 || l - 16 >= sizeof(session[s].user))
{
- log(1, 0, s, t, "CHAP user too long %d\n", len - 21);
+ LOG(1, s, t, "CHAP user too long %d\n", l - 16);
STAT(tunnel_rx_errors);
- return ;
+ sessionshutdown(s, "CHAP username too long.", 3, 0);
+ return;
}
// Run PRE_AUTH plugins
{
struct param_pre_auth packet = { &tunnel[t], &session[s], NULL, NULL, PPPCHAP, 1 };
- packet.username = calloc(len-20, 1);
- packet.password = calloc(16, 1);
- memcpy(packet.username, p + 21, len - 21);
- memcpy(packet.password, p + 5, 16);
+ packet.password = calloc(17, 1);
+ memcpy(packet.password, p, 16);
+
+ p += 16;
+ l -= 16;
+
+ packet.username = calloc(l + 1, 1);
+ memcpy(packet.username, p, l);
run_plugins(PLUGIN_PRE_AUTH, &packet);
if (!packet.continue_auth)
{
- log(3, 0, s, t, "A plugin rejected PRE_AUTH\n");
+ LOG(3, s, t, "A plugin rejected PRE_AUTH\n");
if (packet.username) free(packet.username);
if (packet.password) free(packet.password);
return;
}
radius[r].chap = 1;
- log(3, 0, s, t, "CHAP login %s\n", session[s].user);
+ LOG(3, s, t, "CHAP login %s\n", session[s].user);
radiussend(r, RADIUSAUTH);
}
-char *ppp_lcp_types[] = {
- NULL,
- "ConfigReq",
- "ConfigAck",
- "ConfigNak",
- "ConfigRej",
- "TerminateReq",
- "TerminateAck",
- "CodeRej",
- "ProtocolRej",
- "EchoReq",
- "EchoReply",
- "DiscardRequest",
-};
-
-void dumplcp(u8 *p, int l)
+static void dumplcp(uint8_t *p, int l)
{
- signed int x = l - 4;
- u8 *o = (p + 4);
+ int x = l - 4;
+ uint8_t *o = (p + 4);
- log_hex(5, "PPP LCP Packet", p, l);
- log(4, 0, 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, 0, "Length: %d\n", l);
+ LOG_HEX(5, "PPP LCP Packet", p, l);
+ 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;
{
int type = o[0];
int length = o[1];
- if (length == 0)
+ if (length < 2)
{
- log(4, 0, 0, 0, " Option length is 0...\n");
+ LOG(4, 0, 0, " Option length is %d...\n", length);
break;
}
if (type == 0)
{
- log(4, 0, 0, 0, " Option type is 0...\n");
+ LOG(4, 0, 0, " Option type is 0...\n");
x -= length;
o += length;
continue;
switch (type)
{
case 1: // Maximum-Receive-Unit
- log(4, 0, 0, 0, " %s %d\n", lcp_types[type], ntohs(*(u16 *)(o + 2)));
+ if (length == 4)
+ 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", ppp_lcp_option(type), length);
+ break;
+ case 2: // Async-Control-Character-Map
+ if (length == 6)
+ {
+ 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", ppp_lcp_option(type), length);
break;
case 3: // Authentication-Protocol
+ if (length == 4)
{
- int proto = ntohs(*(u16 *)(o + 2));
- log(4, 0, 0, 0, " %s %s\n", lcp_types[type],
- proto == 0xC223 ? "CHAP" : "PAP");
- break;
+ 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 = *(uint8_t *)(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", ppp_lcp_option(type), length);
+ break;
case 4: // Quality-Protocol
{
- u32 qp = ntohl(*(u32 *)(o + 2));
- log(4, 0, 0, 0, " %s %x\n", lcp_types[type], qp);
- break;
+ 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, 0, " %s %x\n", lcp_types[type], magicno);
- break;
+ 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", ppp_lcp_option(type), length);
+ break;
case 7: // Protocol-Field-Compression
- {
- u32 pfc = ntohl(*(u32 *)(o + 2));
- log(4, 0, 0, 0, " %s %x\n", lcp_types[type], pfc);
- break;
- }
case 8: // Address-And-Control-Field-Compression
- {
- u32 afc = ntohl(*(u32 *)(o + 2));
- log(4, 0, 0, 0, " %s %x\n", lcp_types[type], afc);
- break;
- }
+ LOG(4, 0, 0, " %s\n", ppp_lcp_option(type));
+ break;
default:
- log(2, 0, 0, 0, " Unknown PPP LCP Option type %d\n", type);
+ LOG(2, 0, 0, " Unknown PPP LCP Option type %d\n", type);
break;
}
x -= length;
}
}
-// Process LCP messages
-void processlcp(tunnelidt t, sessionidt s, u8 * p, u16 l)
+void lcp_open(sessionidt s, tunnelidt t)
{
- u8 b[MAXCONTROL];
- u8 *q = NULL;
+ // 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));
- CSTAT(call_processlcp);
+ // LCP now Opened
+ change_state(s, lcp, Opened);
- log_hex(5, "LCP", p, l);
- if (l < 4)
- {
- log(1, session[s].ip, s, t, "Short LCP %d bytes\n", l);
- STAT(tunnel_rx_errors);
- return ;
- }
- if (*p == ConfigAck)
+ if (session[s].ppp.phase == Authenticate)
{
- log(3, session[s].ip, s, t, "LCP: Discarding ConfigAck\n");
+ if (sess_local[s].lcp_authtype == AUTHCHAP)
+ sendchap(s, t);
}
- else if (*p == ConfigReq)
+ else
{
- signed int x = l - 4;
- u8 *o = (p + 4);
-
- log(3, session[s].ip, s, t, "LCP: ConfigReq (%d bytes)...\n", l);
- dumplcp(p, l);
-
- while (x > 2)
- {
- int type = o[0];
- int length = o[1];
- if (length == 0 || type == 0) break;
- switch (type)
- {
- case 1: // Maximum-Receive-Unit
- session[s].mru = ntohs(*(u16 *)(o + 2));
- break;
- case 3: // Authentication-Protocol
- {
- int proto = ntohs(*(u16 *)(o + 2));
- if (proto == 0xC223)
- {
- log(2, session[s].ip, s, t, " Remote end is trying to do CHAP. Rejecting it.\n");
-
- if (!q)
- {
- q = makeppp(b, sizeof(b), p, l, t, s, PPPLCP);
- if (!q) {
- log(2, session[s].ip, s, t, " Failed to send packet.\n");
- break;
- }
- *q++ = ConfigNak;
- }
- memcpy(q, o, length);
- *(u16 *)(q += 2) = htons(0xC023); // NAK -> Use PAP instead
- q += length;
- }
- break;
- }
- case 5: // Magic-Number
- {
-// u32 magicno = ntohl(*(u32 *)(o + 2));
- break;
- }
- case 4: // Quality-Protocol
- {
-// u32 qp = ntohl(*(u32 *)(o + 2));
- break;
- }
- case 7: // Protocol-Field-Compression
- {
-// u32 pfc = ntohl(*(u32 *)(o + 2));
- break;
- }
- case 8: // Address-And-Control-Field-Compression
- {
-// u32 afc = ntohl(*(u32 *)(o + 2));
- break;
- }
- default:
- log(2, session[s].ip, s, t, " Unknown PPP LCP Option type %d\n", type);
- break;
- }
- x -= length;
- o += length;
- }
-
- if (!q)
- {
- // Send back a ConfigAck
- log(3, session[s].ip, s, t, "ConfigReq accepted, sending as Ack\n");
- q = makeppp(b, sizeof(b), p, l, t, s, PPPLCP);
- if (!q) {
- log(3, session[s].ip, s, t, " failed to create packet.\n");
- return;
- }
- *q = ConfigAck;
- tunnelsend(b, l + (q - b), t);
- }
+ // 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
- {
- // Already built a ConfigNak... send it
- log(3, session[s].ip, s, t, "Sending ConfigNak\n");
- tunnelsend(b, l + (q - b), t);
+ change_state(s, ipv6cp, Closed);
- log(3, session[s].ip, s, t, "Sending ConfigReq, requesting PAP login\n");
- q = makeppp(b, sizeof(b), NULL, 0, t, s, PPPLCP);
- *q++ = ConfigReq;
- *(u8 *)(q++) = 3;
- *(u8 *)(q++) = 4;
- *(u16 *)(q += 2) = htons(0xC023);
- tunnelsend(b, l + (q - b), t);
- }
+ change_state(s, ccp, Stopped);
}
- else if (*p == ConfigNak)
+}
+
+static 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_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)
{
- log(1, session[s].ip, s, t, "Remote end sent a ConfigNak. Ignoring\n");
- dumplcp(p, l);
- return ;
+ queued = *response = makeppp(buf, blen, packet, 2, s, session[s].tunnel, mtype);
+ if (!queued)
+ return 0;
+
+ *queued = ConfigRej;
+ queued += 4;
}
- else if (*p == TerminateReq)
+
+ if ((queued - buf + option[1]) > blen)
{
- *p = TerminateAck; // close
- q = makeppp(b, sizeof(b), p, l, t, s, PPPLCP);
- if (!q) {
- log(3, session[s].ip, s, t, "Failed to create PPP packet in processlcp.\n");
- return;
- }
- log(3, session[s].ip, s, t, "LCP: Received TerminateReq. Sending TerminateAck\n");
- sessionshutdown(s, "Remote end closed connection.");
- tunnelsend(b, l + (q - b), t); // send it
+ LOG(2, s, session[s].tunnel, "PPP overflow for ConfigRej (proto %u, option %u).\n", mtype, *option);
+ return 0;
}
- else if (*p == TerminateAck)
+
+ memcpy(queued, option, option[1]);
+ return queued + option[1];
+}
+
+static uint8_t *ppp_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)
{
- sessionshutdown(s, "Connection closed.");
+ 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; // ?
}
- else if (*p == EchoReq)
+
+ if (*response && **response != ConfigNak)
{
- *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) {
- log(3, session[s].ip, s, t, " failed to send EchoReply.\n");
- return;
- }
- log(5, session[s].ip, s, t, "LCP: Received EchoReq. Sending EchoReply\n");
- tunnelsend(b, l + (q - b), t); // send it
+ if (*nak_sent < config->ppp_max_failure) // reject queued
+ return queued;
+
+ return ppp_rej(s, buf, blen, mtype, response, 0, packet, option);
}
- else if (*p == EchoReply)
+
+ if (!*response)
{
- // Ignore it, last_packet time is set earlier than this.
+ if (*nak_sent >= config->ppp_max_failure)
+ return ppp_rej(s, buf, blen, mtype, response, 0, packet, option);
+
+ queued = *response = makeppp(buf, blen, packet, 2, s, session[s].tunnel, mtype);
+ if (!queued)
+ return 0;
+
+ (*nak_sent)++;
+ *queued = ConfigNak;
+ queued += 4;
}
- else
+
+ if ((queued - buf + vlen + 2) > blen)
{
- log(1, session[s].ip, s, t, "Unexpected LCP code %d\n", *p);
- STAT(tunnel_rx_errors);
- return ;
+ 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;
}
-// Process IPCP messages
-void processipcp(tunnelidt t, sessionidt s, u8 * p, u16 l)
+// Process LCP messages
+void processlcp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l)
{
+ uint8_t b[MAXETHER];
+ uint8_t *q = NULL;
+ uint32_t magicno = 0;
+ uint16_t hl;
- CSTAT(call_processipcp);
+ CSTAT(processlcp);
- log_hex(5, "IPCP", p, l);
- if (l < 5)
+ LOG_HEX(5, "LCP", p, l);
+ if (l < 4)
{
- log(1, 0, s, t, "Short IPCP %d bytes\n", l);
+ LOG(1, s, t, "Short LCP %d bytes\n", l);
STAT(tunnel_rx_errors);
return ;
}
- if (*p == ConfigAck)
- { // happy with our IPCP
- u16 r = session[s].radius;
- if ((!r || radius[r].state == RADIUSIPCP) && !session[s].walled_garden) {
- if (!r)
- r = radiusnew(s);
- if (r)
- radiussend(r, RADIUSSTART); // send radius start, having got IPCP at last
- }
- session[s].flags |= SF_IPCP_ACKED;
- return ; // done
- }
- if (*p != ConfigReq)
- {
- log(1, 0, s, t, "Unexpected IPCP code %d\n", *p);
- STAT(tunnel_rx_errors);
- return ;
- }
- if (ntohs(*(u16 *) (p + 2)) > l)
+ if ((hl = ntohs(*(uint16_t *) (p + 2))) > l)
{
- log(1, 0, s, t, "Length mismatch IPCP %d/%d\n", ntohs(*(u16 *) (p + 2)), l);
+ LOG(1, s, t, "Length mismatch LCP %u/%u\n", hl, l);
STAT(tunnel_rx_errors);
return ;
}
- if (!session[s].ip)
- {
- log(3, 0, s, t, "Waiting on radius reply\n");
- return ; // have to wait on RADIUS reply
- }
- // form a config reply quoting the IP in the session
+ l = hl;
+
+ if (session[s].die) // going down...
+ return;
+
+ LOG(*p == EchoReq ? 4 : 3, s, t, "LCP: recv %s\n", ppp_code(*p));
+ if (config->debug > 3) dumplcp(p, l);
+
+ if (*p == ConfigAck)
{
- u8 b[MAXCONTROL];
- u8 *i,
- *q;
+ int x = l - 4;
+ uint8_t *o = (p + 4);
+ int authtype = 0;
- q = p + 4;
- i = p + l;
- while (q < i && q[1])
- {
- if (*q != 0x81 && *q != 0x83 && *q != 3)
- break;
- q += q[1];
- }
- if (q < i)
- { // reject
- u16 n = 4;
- i = p + l;
- q = makeppp(b, sizeof(b), p, l, t, s, PPPIPCP);
- if (!q) {
- log(2, 0, s, t, "Failed to send IPCP.\n");
- return;
- }
- *q = ConfigRej;
- p += 4;
- while (p < i && p[1])
- {
- if (*p != 0x81 && *p != 0x83 && *p != 3)
- {
- log(2, 0, s, t, "IPCP reject %d\n", *p);
- memcpy(q + n, p, p[1]);
- n += p[1];
- }
- p += p[1];
- }
- *(u16 *) (q + 2) = htons(n);
- tunnelsend(b, n + (q - b), t); // send it
- }
- else
+ while (x > 2)
{
- *p = ConfigAck;
- i = findppp(p, 0x81); // Primary DNS address
- if (i)
- {
- if (*(u32 *) (i + 2) != htonl(session[s].dns1))
- {
- *(u32 *) (i + 2) = htonl(session[s].dns1);
- *p = ConfigNak;
- }
- }
- i = findppp(p, 0x83); // Secondary DNS address (TBA, is it)
- if (i)
- {
- if (*(u32 *) (i + 2) != htonl(session[s].dns2))
- {
- *(u32 *) (i + 2) = htonl(session[s].dns2);
- *p = ConfigNak;
- }
- }
- i = findppp(p, 3); // IP address
- if (!i || i[1] != 6)
- {
- log(1, 0, s, t, "No IP in IPCP request\n");
- STAT(tunnel_rx_errors);
- return ;
- }
- if (*(u32 *) (i + 2) != htonl(session[s].ip))
+ int type = o[0];
+ int length = o[1];
+
+ if (length == 0 || type == 0 || x < length) break;
+ switch (type)
{
- *(u32 *) (i + 2) = htonl(session[s].ip);
- *p = ConfigNak;
- }
- q = makeppp(b, sizeof(b), p, l, t, s, PPPIPCP);
- if (!q) {
- log(2, 0, s, t, " Failed to send IPCP packet.\n");
- return;
+ 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;
}
- tunnelsend(b, l + (q - b), t); // send it
+ x -= length;
+ o += length;
}
- }
-}
-// 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(tunnelidt t, sessionidt s, u8 * p, u16 l)
-{
- ipt ip;
+ if (!session[s].ip && authtype)
+ sess_local[s].lcp_authtype = authtype;
+ switch (session[s].ppp.lcp)
+ {
+ case RequestSent:
+ initialise_restart_count(s, lcp);
+ change_state(s, lcp, AckReceived);
+ break;
- CSTAT(call_processipin);
+ 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);
- log_hex(5, "IP", p, l);
+ sendlcp(s, t);
+ change_state(s, lcp, RequestSent);
+ break;
- ip = ntohl(*(u32 *)(p + 12));
+ case AckSent:
+ lcp_open(s, t);
+ break;
- if (l > MAXETHER)
- {
- log(1, ip, s, t, "IP packet too long %d\n", l);
- STAT(tunnel_rx_errors);
- return ;
+ default:
+ LOG(2, s, t, "LCP: ignoring %s in state %s\n", ppp_code(*p), ppp_state(session[s].ppp.lcp));
+ }
}
-
- // no spoof (do sessionbyip to handled statically routed subnets)
- if (ip != session[s].ip && sessionbyip(htonl(ip)) != s)
+ else if (*p == ConfigReq)
{
- log(5, ip, s, t, "Dropping packet with spoofed IP %s\n", inet_toa(htonl(ip)));
- return;
- }
+ 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];
- // Add on the tun header
- p -= 4;
- *(u32 *)p = htonl(0x00000800);
- l += 4;
+ while (x > 2)
+ {
+ int type = o[0];
+ int length = o[1];
- 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.
- return;
- }
+ if (length == 0 || type == 0 || x < length) break;
+ switch (type)
+ {
+ case 1: // Maximum-Receive-Unit
+ session[s].mru = ntohs(*(uint16_t *)(o + 2));
+ break;
- session[s].cin += l - 4;
- session[s].total_cin += l - 4;
- sess_count[s].cin += l - 4;
+ case 2: // Async-Control-Character-Map
+ if (!ntohl(*(uint32_t *)(o + 2))) // all bits zero is OK
+ break;
- session[s].pin++;
- eth_tx += l - 4;
+ LOG(3, s, t, " Remote requesting asyncmap. Rejecting.\n");
+ q = ppp_nak(s, b, sizeof(b), PPPLCP, &response, q, p, o, asyncmap, sizeof(asyncmap));
+ break;
+
+ case 3: // Authentication-Protocol
+ {
+ int proto = ntohs(*(uint16_t *)(o + 2));
+ char proto_name[] = "0x0000";
+ int alen;
+
+ if (proto == PPPPAP)
+ {
+ if (config->radius_authtypes & AUTHPAP)
+ {
+ sess_local[s].lcp_authtype = AUTHPAP;
+ 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;
+ }
+
+ strcpy(proto_name, "CHAP");
+ }
+ else
+ sprintf(proto_name, "%#4.4x", proto);
+
+ LOG(3, s, t, " Remote requesting %s authentication. Rejecting.\n", proto_name);
+
+ alen = add_lcp_auth(authproto, sizeof(authproto), config->radius_authprefer);
+ if (alen < 2) break; // paranoia
+
+ q = ppp_nak(s, b, sizeof(b), PPPLCP, &response, q, p, o, authproto + 2, alen - 2);
+ if (q && *response == ConfigNak &&
+ config->radius_authtypes != config->radius_authprefer)
+ {
+ // alternate type
+ alen = add_lcp_auth(authproto, sizeof(authproto), config->radius_authtypes & ~config->radius_authprefer);
+ if (alen < 2) break;
+ q = ppp_nak(s, b, sizeof(b), PPPLCP, &response, q, p, o, authproto + 2, alen - 2);
+ }
+
+ break;
+ }
+ break;
+
+ case 5: // Magic-Number
+ magicno = ntohl(*(uint32_t *)(o + 2));
+ break;
+
+ case 4: // Quality-Protocol
+ case 7: // Protocol-Field-Compression
+ case 8: // Address-And-Control-Field-Compression
+ break;
+
+ default: // Reject any unknown options
+ LOG(3, s, t, " Rejecting unknown PPP LCP option %d\n", type);
+ q = ppp_rej(s, b, sizeof(b), PPPLCP, &response, q, p, o);
+ }
+ x -= length;
+ o += length;
+ }
+
+ if (response)
+ {
+ 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);
+ if (!response) return;
+ *response = ConfigAck;
+ }
+
+ switch (session[s].ppp.lcp)
+ {
+ case Closed:
+ response = makeppp(b, sizeof(b), p, 2, s, t, PPPLCP);
+ if (!response) return;
+ *response = TerminateAck;
+ *((uint16_t *) (response + 2)) = htons(l = 4);
+ break;
+
+ 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;
+
+ 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 == ConfigNak || *p == ConfigRej)
+ {
+ 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)
+ {
+ session[s].mru = ntohs(*(uint16_t *)(o + 2));
+ LOG(3, s, t, " Remote requested MRU of %u\n", session[s].mru);
+ }
+ else
+ {
+ session[s].mru = 0;
+ LOG(3, s, t, " Remote rejected MRU negotiation\n");
+ }
+
+ break;
+
+ case 3: // Authentication-Protocol
+ if (authtype > 0)
+ break;
+
+ if (*p == ConfigNak)
+ {
+ int proto = ntohs(*(uint16_t *)(o + 2));
+ if (proto == PPPPAP)
+ {
+ authtype = config->radius_authtypes & AUTHPAP;
+ LOG(3, s, t, " Remote requested PAP authentication...%sing\n",
+ authtype ? "accept" : "reject");
+ }
+ else if (proto == PPPCHAP && *(o + 4) == 5)
+ {
+ authtype = config->radius_authtypes & AUTHCHAP;
+ LOG(3, s, t, " Remote requested CHAP authentication...%sing\n",
+ authtype ? "accept" : "reject");
+ }
+ else
+ {
+ LOG(3, s, t, " Rejecting unsupported authentication %#4x\n",
+ proto);
+ }
+ }
+ else
+ {
+ LOG(2, s, t, "LCP: remote rejected auth negotiation\n");
+ authtype = 0; // shutdown
+ }
+
+ break;
+
+ default:
+ LOG(2, s, t, "LCP: remote sent %s for type %u?\n", ppp_code(*p), type);
+ break;
+ }
+ x -= length;
+ o += length;
+ }
+
+ if (!authtype)
+ {
+ sessionshutdown(s, "Unsupported authentication.", 3, 0);
+ 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);
+ 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)
+ {
+ *p = TerminateAck; // close
+ q = makeppp(b, sizeof(b), p, l, s, t, PPPLCP);
+ if (!q) return;
+
+ LOG(3, s, t, "LCP: send %s\n", ppp_code(*q));
+ if (config->debug > 3) dumplcp(q, l);
+
+ tunnelsend(b, l + (q - b), t); // send it
+ sessionshutdown(s, "Remote end closed connection.", 3, 0);
+ }
+ else if (*p == TerminateAck)
+ {
+ sessionshutdown(s, "Connection closed.", 3, 0);
+ }
+ else if (*p == ProtocolRej)
+ {
+ 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(3, s, t, "LCP protocol reject: 0x%04X\n", proto);
+ }
+ }
+ else if (*p == EchoReq)
+ {
+ *p = EchoReply; // reply
+ *(uint32_t *) (p + 4) = htonl(session[s].magic); // our magic number
+ q = makeppp(b, sizeof(b), p, l, s, t, PPPLCP);
+ if (!q) return;
+
+ LOG(4, s, t, "LCP: send %s\n", ppp_code(*q));
+ if (config->debug > 3) dumplcp(q, l);
+
+ tunnelsend(b, l + (q - b), t); // send it
+ }
+ else if (*p == EchoReply)
+ {
+ // Ignore it, last_packet time is set earlier than this.
+ }
+ else if (*p != CodeRej)
+ {
+ int code = *p;
+ int mru = session[s].mru;
+ if (!mru)
+ mru = DEFAULT_MRU;
+
+ if (l > mru) l = mru;
+
+ *p = CodeRej;
+ q = makeppp(b, sizeof(b), p, l, s, t, PPPLCP);
+ if (!q) return;
+
+ LOG(2, s, t, "Unexpected LCP code %s\n", ppp_code(code));
+ LOG(3, s, t, "LCP: send %s\n", ppp_code(*q));
+ if (config->debug > 3) dumplcp(q, l);
+
+ tunnelsend(b, l + (q - b), t);
+ }
+}
+
+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)
+ {
+ uint16_t r = radiusnew(s);
+ if (r)
+ radiussend(r, RADIUSSTART); // send radius start
+ }
+
+ // 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(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l)
+{
+ uint8_t b[MAXETHER];
+ uint8_t *q = 0;
+ uint16_t hl;
+
+ CSTAT(processipcp);
+
+ LOG_HEX(5, "IPCP", p, l);
+ if (l < 5)
+ {
+ LOG(1, s, t, "Short IPCP %d bytes\n", l);
+ STAT(tunnel_rx_errors);
+ return ;
+ }
+
+ if ((hl = ntohs(*(uint16_t *) (p + 2))) > l)
+ {
+ LOG(1, s, t, "Length mismatch IPCP %u/%u\n", hl, l);
+ STAT(tunnel_rx_errors);
+ return ;
+ }
+ l = hl;
+
+ 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)
+ {
+ switch (*o)
+ {
+ case 3: // ip address
+ gotip++; // seen address
+ if (o[1] != 6 || o[1] > length) return;
+
+ addr = htonl(session[s].ip);
+ if (memcmp(o + 2, &addr, (sizeof addr)))
+ {
+ uint8_t *oq = q;
+ q = ppp_nak(s, b, sizeof(b), PPPIPCP, &response, q, p, o, (uint8_t *) &addr, sizeof(addr));
+ if (!q || (q != oq && *response == ConfigRej))
+ {
+ sessionshutdown(s, "Can't negotiate IPCP.", 3, 0);
+ return;
+ }
+ }
+
+ break;
+
+ case 129: // primary DNS
+ if (o[1] != 6 || o[1] > length) return;
+
+ addr = htonl(session[s].dns1);
+ if (memcmp(o + 2, &addr, (sizeof addr)))
+ {
+ q = ppp_nak(s, b, sizeof(b), PPPIPCP, &response, q, p, o, (uint8_t *) &addr, sizeof(addr));
+ if (!q) return;
+ }
+
+ break;
+
+ case 131: // secondary DNS
+ if (o[1] != 6 || o[1] > length) return;
+
+ addr = htonl(session[s].dns1);
+ if (memcmp(o + 2, &addr, sizeof(addr)))
+ {
+ q = ppp_nak(s, b, sizeof(b), PPPIPCP, &response, q, p, o, (uint8_t *) &addr, sizeof(addr));
+ if (!q) return;
+ }
+
+ break;
+
+ default:
+ LOG(2, s, t, " Rejecting PPP IPCP Option type %d\n", *o);
+ q = ppp_rej(s, b, sizeof(b), PPPIPCP, &response, q, p, o);
+ 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);
+ 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);
+ 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)
+ {
+ *p = TerminateAck;
+ q = makeppp(b, sizeof(b), p, l, s, t, PPPIPCP);
+ if (!q) return;
+ LOG(3, s, t, "IPCP: send %s\n", ppp_code(*q));
+ tunnelsend(b, l + (q - b), t);
+ change_state(s, ipcp, Stopped);
+ }
+ else if (*p != CodeRej)
+ {
+ int code = *p;
+ int mru = session[s].mru;
+ if (!mru)
+ mru = DEFAULT_MRU;
+
+ if (l > mru) l = mru;
+
+ *p = CodeRej;
+ q = makeppp(b, sizeof(b), p, l, s, t, PPPIPCP);
+ if (!q) return;
+
+ LOG(2, s, t, "Unexpected IPCP code %s\n", ppp_code(code));
+ LOG(3, s, t, "IPCP: send %s\n", ppp_code(*q));
+ tunnelsend(b, l + (q - b), t);
+ }
+}
+
+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 (!config->ipv6_prefix.s6_addr[0])
+ {
+ LOG(2, s, t, "IPV6CP: %s rejected (not configured)\n", ppp_code(*p));
+ *p = ProtocolRej;
+ q = makeppp(b, sizeof(b), p, l, s, t, PPPIPV6CP);
+ if (!q) return;
+ tunnelsend(b, l + (q - b), t);
+ return;
+ }
+
+ if (!session[s].ip)
+ {
+ LOG(3, s, t, "IPV6CP: no IPv4 address (IPCP in state %s)\n", ppp_state(session[s].ppp.ipcp));
+ 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;
+ uint8_t ident[8];
+
+ while (length > 2)
+ {
+ switch (*o)
+ {
+ case 1: // interface identifier
+ gotip++; // seen address
+ if (o[1] != 10 || o[1] > length) return;
+
+ *(uint32_t *) ident = htonl(session[s].ip);
+ *(uint32_t *) (ident + 4) = 0;
+
+ if (memcmp(o + 2, ident, sizeof(ident)))
+ {
+ q = ppp_nak(s, b, sizeof(b), PPPIPV6CP, &response, q, p, o, ident, sizeof(ident));
+ if (!q) return;
+ }
+
+ break;
+
+ default:
+ LOG(2, s, t, " Rejecting PPP IPV6CP Option type %d\n", *o);
+ q = ppp_rej(s, b, sizeof(b), PPPIPV6CP, &response, q, p, o);
+ 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);
+ 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);
+ 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)
+ {
+ *p = TerminateAck;
+ q = makeppp(b, sizeof(b), p, l, s, t, PPPIPV6CP);
+ 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);
+ }
+ else if (*p != CodeRej)
+ {
+ int code = *p;
+ int mru = session[s].mru;
+ if (!mru)
+ mru = DEFAULT_MRU;
+
+ if (l > mru) l = mru;
+
+ *p = CodeRej;
+ q = makeppp(b, sizeof(b), p, l, s, t, PPPIPV6CP);
+ if (!q) return;
+
+ LOG(2, s, t, "Unexpected IPV6CP code %s\n", ppp_code(code));
+ LOG(3, s, t, "IPV6CP: send %s\n", ppp_code(*q));
+ tunnelsend(b, l + (q - b), t);
+ }
+}
+
+// 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);
+
+ 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;
+
+ // no spoof (do sessionbyip to handled statically routed subnets)
+ if (ip != session[s].ip && sessionbyip(htonl(ip)) != s)
+ {
+ LOG(5, 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;
+
+ // Add on the tun header
+ p -= 4;
+ *(uint32_t *) p = htonl(PKTIP);
+ l += 4;
+
+ // Are we throttled and a slave?
+ if (session[s].tbf_in && !config->cluster_iam_master) {
+ // Pass it to the master for handling.
+ master_throttle_packet(session[s].tbf_in, p, l);
+ return;
+ }
+
+ // Are we throttled and a master??
+ if (session[s].tbf_in && config->cluster_iam_master) {
+ // Actually handle the throttled packets.
+ tbf_queue_packet(session[s].tbf_in, p, l);
+ 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, send it to ASIO
+ // Snooping this session
snoop_send_packet(p, l, session[s].snoop_ip, session[s].snoop_port);
}
+
+ increment_counter(&session[s].cin, &session[s].cin_wrap, l);
+ session[s].cin_delta += l;
+ session[s].pin++;
+
+ sess_local[s].cin += l;
+ sess_local[s].pin++;
+
+ eth_tx += l;
+
STAT(tun_tx_packets);
INC_STAT(tun_tx_bytes, l);
+}
+
+// process IPv6 packet received
+//
+// This MUST be called with at least 4 byte behind 'p'.
+// (i.e. this routine writes to p[-4]).
+void processipv6in(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l)
+{
+ struct in6_addr ip;
+ in_addr_t ipv4;
+
+ CSTAT(processipv6in);
+
+ LOG_HEX(5, "IPv6", p, l);
+
+ ip = *(struct in6_addr *) (p + 8);
+ ipv4 = ntohl(*(uint32_t *)(p + 16));
+
+ 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.ipv6cp != Opened)
+ return;
+
+ // no spoof
+ if (ipv4 != session[s].ip && memcmp(&config->ipv6_prefix, &ip, 8) && sessionbyipv6(ip) != s)
+ {
+ char str[INET6_ADDRSTRLEN];
+ LOG(5, s, t, "Dropping packet with spoofed IP %s\n",
+ inet_ntop(AF_INET6, &ip, str, INET6_ADDRSTRLEN));
+ return;
+ }
+
+ // 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;
+ *(uint32_t *) p = htonl(PKTIPV6);
+ l += 4;
+
+ // Are we throttled and a slave?
+ if (session[s].tbf_in && !config->cluster_iam_master) {
+ // Pass it to the master for handling.
+ master_throttle_packet(session[s].tbf_in, p, l);
+ return;
+ }
- 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;
}
if (tun_write(p, l) < 0)
{
STAT(tun_tx_errors);
- log(0, 0, s, t, "Error writing %d bytes to TUN device: %s (tunfd=%d, p=%p)\n",
+ 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);
}
+ 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++;
+
+ eth_tx += l;
+
+ STAT(tun_tx_packets);
+ 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);
+ LOG_HEX(5, "IP in throttled", buf, len);
+
if (write(tunfd, buf, len) < 0)
{
STAT(tun_tx_errors);
- log(0, 0, 0, 0, "Error writing %d bytes to TUN device: %s (tunfd=%d, p=%p)\n",
+ LOG(0, 0, 0, "Error writing %d bytes to TUN device: %s (tunfd=%d, p=%p)\n",
len, strerror(errno), tunfd, buf);
+
+ return;
}
- // Increment packet counters
- session[s].cin += len - 4;
- session[s].total_cin += len - 4;
- sess_count[s].cin += len - 4;
+ buf += 4;
+ len -= 4;
+
+ if (session[s].snoop_ip && session[s].snoop_port)
+ {
+ // Snooping this session
+ snoop_send_packet(buf, len, session[s].snoop_ip, session[s].snoop_port);
+ }
+ // Increment packet counters
+ 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 LCP messages
-void processccp(tunnelidt t, sessionidt s, u8 * p, u16 l)
+// Process CCP messages
+void processccp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l)
{
+ uint8_t b[MAXETHER];
+ uint8_t *q;
+
+ CSTAT(processccp);
- CSTAT(call_processccp);
+ LOG_HEX(5, "CCP", p, l);
- log_hex(5, "CCP", p, l);
- if (l < 2 || (*p != ConfigReq && *p != TerminateReq))
+ if (session[s].ppp.phase < Network)
{
- log(1, 0, s, t, "Unexpecetd CCP request code %d\n", *p);
+ LOG(2, s, t, "CCP %s ignored in %s phase\n", ppp_code(*p), ppp_phase(session[s].ppp.phase));
+ return;
+ }
+
+ if (l < 1)
+ {
+ LOG(1, s, t, "Short CCP packet\n");
STAT(tunnel_rx_errors);
- return ;
}
- // reject
+
+ LOG(3, s, t, "CCP: recv %s\n", ppp_code(*p));
+ if (*p == ConfigAck)
{
- u8 b[MAXCONTROL];
- u8 *q;
- if (*p == ConfigReq)
+ switch (session[s].ppp.ccp)
{
- if (l < 6)
- {
- *p = ConfigAck; // accept no compression
- }
- else
- {
- *p = ConfigRej; // reject
- }
+ 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
- *p = TerminateAck; // close
- q = makeppp(b, sizeof(b), p, l, t, s, PPPCCP);
- if (!q) {
- log(1,0,0,0, "Failed to send CCP packet.\n");
+ }
+ else if (*p == ConfigReq)
+ {
+ if (l < 6) // accept no compression
+ *p = ConfigAck;
+ else // compression requested--reject
+ *p = ConfigRej;
+
+ q = makeppp(b, sizeof(b), p, l, s, t, PPPCCP);
+ if (!q) return;
+
+ switch (session[s].ppp.ccp)
+ {
+ case Closed:
+ q = makeppp(b, sizeof(b), p, 2, s, t, PPPCCP);
+ if (!q) return;
+ *q = TerminateAck;
+ *((uint16_t *) (q + 2)) = htons(l = 4);
+ 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);
+
+ break;
+
+ case RequestSent:
+ if (*q == ConfigAck)
+ change_state(s, ccp, AckSent);
+
+ break;
+
+ case AckReceived:
+ if (*q == ConfigAck)
+ change_state(s, ccp, Opened);
+
+ 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;
}
- tunnelsend(b, l + (q - b), t); // send it
+
+ LOG(3, 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);
+ 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)
+ {
+ int code = *p;
+ int mru = session[s].mru;
+ if (!mru)
+ mru = DEFAULT_MRU;
+
+ if (l > mru) l = mru;
+
+ *p = CodeRej;
+ q = makeppp(b, sizeof(b), p, l, s, t, PPPCCP);
+ if (!q) return;
+
+ LOG(2, s, t, "Unexpected CCP code %s\n", ppp_code(code));
+ LOG(3, s, t, "CCP: send %s\n", ppp_code(*q));
+ tunnelsend(b, l + (q - b), t);
}
}
-// 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, 0, s, t, "No RADIUS to send challenge\n");
+ LOG(1, s, t, "No RADIUS to send challenge\n");
STAT(tunnel_tx_errors);
- return ;
- }
- log(1, 0, s, t, "Send CHAP challenge\n");
- { // new challenge
- int n;
- for (n = 0; n < 15; n++)
- radius[r].auth[n] = rand();
+ return;
}
- radius[r].chap = 1; // CHAP not PAP
+
+ LOG(1, s, t, "Send CHAP challenge\n");
+
+ 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.", 3, 0);
STAT(tunnel_tx_errors);
return ;
}
- q = makeppp(b, sizeof(b), 0, 0, t, s, PPPCHAP);
- if (!q) {
- log(1, 0, s, t, "failed to send CHAP challenge.\n");
- return;
- }
- *q = 1; // challenhe
- q[1] = radius[r].id; // ID
- q[4] = 16; // length
- memcpy(q + 5, radius[r].auth, 16); // challenge
- strcpy(q + 21, hostname); // our name
- *(u16 *) (q + 2) = htons(strlen(hostname) + 21); // length
+ q = makeppp(b, sizeof(b), 0, 0, s, t, PPPCHAP);
+ if (!q) return;
+
+ *q = 1; // challenge
+ q[1] = radius[r].id; // ID
+ q[4] = 16; // value size (size of challenge)
+ memcpy(q + 5, radius[r].auth, 16); // challenge
+ 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)
{
+ if (size < 12) // Need more space than this!!
+ {
+ static int backtrace_count = 0;
+ LOG(0, s, t, "makeppp buffer too small for L2TP header (size=%d)\n", size);
+ log_backtrace(backtrace_count, 5)
+ return NULL;
+ }
- if (size < 12)
- return NULL; // Need more space than this!!
-
- *(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
+ *(uint16_t *) (b + 0) = htons(0x0002); // L2TP with no options
+ *(uint16_t *) (b + 2) = htons(tunnel[t].far); // tunnel
+ *(uint16_t *) (b + 4) = htons(session[s].far); // session
b += 6;
- if (mtype != PPPLCP && !(session[s].l2tp_flags & SESSIONACFC))
+ if (mtype == PPPLCP || !(session[s].l2tp_flags & SESSIONACFC))
{
- *(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;
else
{
- *(u16 *) b = htons(mtype);
+ *(uint16_t *) b = htons(mtype);
b += 2;
}
- if (l + 12 > size) {
- log(3,0,0,0, "Would have overflowed the buffer in makeppp: size %d, len %d.\n", size, l);
- return NULL; // Run out of room to hold the packet!
+ if (l + 12 > size)
+ {
+ static int backtrace_count = 0;
+ LOG(2, s, t, "makeppp would overflow buffer (size=%d, header+payload=%d)\n", size, l + 12);
+ log_backtrace(backtrace_count, 5)
+ return NULL;
}
+
if (p && l)
memcpy(b, p, l);
+
return b;
}
-// find a PPP option, returns point to option, or 0 if not found
-u8 *findppp(u8 * b, u8 mtype)
+static int add_lcp_auth(uint8_t *b, int size, int authtype)
{
- u16 l = ntohs(*(u16 *) (b + 2));
- if (l < 4)
+ int len = 0;
+ if ((authtype == AUTHCHAP && size < 5) || size < 4)
return 0;
- b += 4;
- l -= 4;
- while (l)
+
+ *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)
{
- if (l < b[1] || !b[1])
- return 0; // faulty
- if (*b == mtype)
- return b;
- l -= b[1];
- b += b[1];
+ len = *b++ = 4; // length
+ *(uint16_t *) b = htons(PPPPAP); b += 2;
}
- return 0;
+ else
+ {
+ LOG(0, 0, 0, "add_lcp_auth called with unsupported auth type %d\n", authtype);
+ }
+
+ return len;
}
-// Send initial LCP ConfigReq
-void initlcp(tunnelidt t, sessionidt s)
+// Send initial LCP ConfigReq for MRU, authentication type and magic no
+void sendlcp(sessionidt s, tunnelidt t)
{
- char b[500] = {0}, *q;
+ uint8_t b[500], *q, *l;
+ int authtype = sess_local[s].lcp_authtype;
- q = makeppp(b, sizeof(b), NULL, 0, t, s, PPPLCP);
- if (!q) {
- log(1, 0, s, t, "Failed to send LCP ConfigReq.\n");
+ if (!(q = makeppp(b, sizeof(b), NULL, 0, s, t, PPPLCP)))
return;
+
+ LOG(3, s, t, "LCP: send ConfigReq%s%s%s\n",
+ authtype ? " (" : "",
+ authtype ? (authtype == AUTHCHAP ? "CHAP" : "PAP") : "",
+ authtype ? ")" : "");
+
+ l = q;
+ *l++ = ConfigReq;
+ *l++ = (time_now % 255) + 1; // ID
+
+ l += 2; //Save space for length
+
+ if (session[s].mru)
+ {
+ *l++ = 1; *l++ = 4; // Maximum-Receive-Unit (length 4)
+ *(uint16_t *) l = htons(session[s].mru); l += 2;
}
- log(4, 0, s, t, "Sending LCP ConfigReq for PAP\n");
- *q = ConfigReq;
- *(u8 *)(q + 1) = (time_now % 255) + 1; // ID
- *(u16 *)(q + 2) = htons(8); // Length
- *(u8 *)(q + 4) = 3;
- *(u8 *)(q + 5) = 4;
- *(u16 *)(q + 6) = htons(0xC023); // PAP
- tunnelsend(b, 12 + 8, t);
+
+ 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;
+
+ *(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);
}
+// Send CCP request for no compression
+void sendccp(sessionidt s, tunnelidt t)
+{
+ uint8_t b[500], *q;
+
+ if (!(q = makeppp(b, sizeof(b), NULL, 0, s, t, PPPCCP)))
+ return;
+
+ LOG(3, s, t, "CCP: send ConfigReq (no compression)\n");
+
+ *q = ConfigReq;
+ *(uint8_t *)(q + 1) = (time_now % 255) + 1; // ID
+ *(uint16_t *)(q + 2) = htons(4); // Length
+
+ LOG_HEX(5, "PPPCCP", q, 4);
+ tunnelsend(b, (q - b) + 4 , t);
+}
projects / l2tpns.git / blobdiff