// L2TPNS PPP Stuff
-char const *cvs_id_ppp = "$Id: ppp.c,v 1.67 2005/08/10 08:59:23 bodea Exp $";
+char const *cvs_id_ppp = "$Id: ppp.c,v 1.76 2005/08/29 03:21:14 bodea Exp $";
#include <stdio.h>
#include <string.h>
static int add_lcp_auth(uint8_t *b, int size, int authtype);
// Process PAP messages
-void processpap(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l)
+void processpap(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l)
{
char user[MAXUSER];
char pass[MAXPASS];
LOG(3, s, t, "PAP login %s/%s\n", user, pass);
}
- r = radiusnew(s);
- if (session[s].ip || !r)
+ if (session[s].ip || !(r = radiusnew(s)))
{
// respond now, either no RADIUS available or already authenticated
uint8_t b[MAXCONTROL];
uint8_t id = p[1];
- uint8_t *p = makeppp(b, sizeof(b), 0, 0, t, s, PPPPAP);
+ uint8_t *p = makeppp(b, sizeof(b), 0, 0, s, t, PPPPAP);
if (!p) return;
if (session[s].ip)
}
// Process CHAP messages
-void processchap(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l)
+void processchap(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l)
{
uint16_t r;
uint16_t hl;
CSTAT(processchap);
LOG_HEX(5, "CHAP", p, l);
- r = sess_local[s].radius;
- if (!r)
- {
- LOG(1, s, t, "Unexpected CHAP message\n");
- STAT(tunnel_rx_errors);
- return;
- }
if (l < 4)
{
return;
}
+ r = sess_local[s].radius;
+ if (!r)
+ {
+ 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));
}
}
-void lcp_open(tunnelidt t, sessionidt s)
+void lcp_open(sessionidt s, tunnelidt t)
{
// transition to Authentication or Network phase:
session[s].ppp.phase = sess_local[s].lcp_authtype ? Authenticate : Network;
+ LOG(3, s, t, "LCP: Opened, phase %s\n", ppp_phase(session[s].ppp.phase));
+
// LCP now Opened
change_state(s, lcp, Opened);
if (session[s].ppp.phase == Authenticate)
{
if (sess_local[s].lcp_authtype == AUTHCHAP)
- sendchap(t, s);
+ sendchap(s, t);
}
else
{
// This-Layer-Up
- sendipcp(t, s);
+ sendipcp(s, t);
change_state(s, ipcp, RequestSent);
// move to passive state for IPv6 (if configured), CCP
if (config->ipv6_prefix.s6_addr[0])
{
if (!*response || **response != ConfigRej)
{
- queued = *response = makeppp(buf, blen, packet, 2, session[s].tunnel, s, mtype);
+ queued = *response = makeppp(buf, blen, packet, 2, s, session[s].tunnel, mtype);
if (!queued)
return 0;
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, session[s].tunnel, s, mtype);
+ queued = *response = makeppp(buf, blen, packet, 2, s, session[s].tunnel, mtype);
if (!queued)
return 0;
- *nak_sent++;
+ (*nak_sent)++;
*queued = ConfigNak;
queued += 4;
}
}
// Process LCP messages
-void processlcp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l)
+void processlcp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l)
{
uint8_t b[MAXCONTROL];
uint8_t *q = NULL;
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)
{
int x = l - 4;
uint8_t *o = (p + 4);
int authtype = 0;
- LOG(3, s, t, "LCP: ConfigAck (%d bytes)...\n", l);
- if (config->debug > 3) dumplcp(p, l);
-
while (x > 2)
{
int type = o[0];
break;
case AckSent:
- lcp_open(t, s);
+ lcp_open(s, t);
break;
default:
static uint8_t asyncmap[4] = { 0, 0, 0, 0 }; // all zero
static uint8_t authproto[5];
- LOG(3, s, t, "LCP: ConfigReq (%d bytes)...\n", l);
- if (config->debug > 3) dumplcp(p, l);
-
while (x > 2)
{
int type = o[0];
if (!ntohl(*(uint32_t *)(o + 2))) // all bits zero is OK
break;
- LOG(2, s, t, " Remote requesting asyncmap. Rejecting.\n");
+ 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;
else
sprintf(proto_name, "%#4.4x", proto);
- LOG(2, s, t, " Remote requesting %s authentication. Rejecting.\n", proto_name);
+ LOG(3, s, t, " Remote requesting %s authentication. Rejecting.\n", proto_name);
alen = add_lcp_auth(authproto, sizeof(authproto), config->radius_authprefer);
if (alen < 2) break; // paranoia
break;
default: // Reject any unknown options
- LOG(2, s, t, " Rejecting PPP LCP Option type %d\n", type);
+ 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;
else
{
// Send packet back as ConfigAck
- response = makeppp(b, sizeof(b), p, l, t, s, PPPLCP);
+ response = makeppp(b, sizeof(b), p, l, s, t, PPPLCP);
if (!response) return;
*response = ConfigAck;
}
switch (session[s].ppp.lcp)
{
case Closed:
- response = makeppp(b, sizeof(b), p, 2, t, s, PPPLCP);
+ response = makeppp(b, sizeof(b), p, 2, s, t, PPPLCP);
if (!response) return;
*response = TerminateAck;
*((uint16_t *) (response + 2)) = htons(l = 4);
case AckReceived:
if (*response == ConfigAck)
- lcp_open(t, s);
+ lcp_open(s, t);
break;
return;
}
- LOG(3, s, t, "LCP: Sending %s\n", ppp_code(*response));
+ LOG(3, s, t, "LCP: send %s\n", ppp_code(*response));
+ if (config->debug > 3) dumplcp(response, l);
+
tunnelsend(b, l + (response - b), t);
}
else if (*p == ConfigNak)
uint8_t *o = (p + 4);
int authtype = -1;
- LOG(3, s, t, "LCP: ConfigNak (%d bytes)...\n", l);
- if (config->debug > 3) dumplcp(p, l);
-
while (x > 2)
{
int type = o[0];
case Closed:
case Stopped:
{
- uint8_t *response = makeppp(b, sizeof(b), p, 2, t, s, PPPLCP);
+ uint8_t *response = makeppp(b, sizeof(b), p, 2, s, t, PPPLCP);
if (!response) return;
*response = TerminateAck;
*((uint16_t *) (response + 2)) = htons(l = 4);
+
+ LOG(3, s, t, "LCP: send %s\n", ppp_code(*response));
+ if (config->debug > 3) dumplcp(response, l);
+
tunnelsend(b, l + (response - b), t);
}
break;
}
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);
+ 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 == ProtocolRej)
{
- if (*(uint16_t *) (p+4) == htons(PPPIPV6CP))
+ uint16_t proto = 0;
+
+ if (l > 4)
+ {
+ proto = *(p+4);
+ if (l > 5 && !(proto & 1))
+ {
+ proto <<= 8;
+ proto |= *(p+5);
+ }
+ }
+
+ if (proto == PPPIPV6CP)
{
LOG(3, s, t, "IPv6 rejected\n");
change_state(s, ipv6cp, Closed);
}
else
{
- LOG(1, s, t, "Unexpected LCP protocol reject 0x%X\n",
- ntohs(*(uint16_t *) (p+4)));
- STAT(tunnel_rx_errors);
+ LOG(3, s, t, "LCP protocol reject: 0x%04X\n", proto);
}
}
else if (*p == EchoReq)
{
- LOG(5, s, t, "LCP: Received EchoReq. Sending EchoReply\n");
*p = EchoReply; // reply
*(uint32_t *) (p + 4) = htonl(session[s].magic); // our magic number
- q = makeppp(b, sizeof(b), p, l, t, s, PPPLCP);
+ q = makeppp(b, sizeof(b), p, l, s, t, PPPLCP);
if (!q) return;
+
+ LOG(4, s, t, "LCP: send %s\n", ppp_code(*q));
+ if (config->debug > 3) dumplcp(q, l);
+
tunnelsend(b, l + (q - b), t); // send it
}
else if (*p == EchoReply)
if (l > mru) l = mru;
*p = CodeRej;
- q = makeppp(b, sizeof(b), p, l, t, s, PPPLCP);
+ q = makeppp(b, sizeof(b), p, l, s, t, PPPLCP);
if (!q) return;
- LOG(3, s, t, "Unexpected LCP code %s\n", ppp_code(code));
+ 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(tunnelidt t, sessionidt s)
+static void ipcp_open(sessionidt s, tunnelidt t)
{
LOG(3, s, t, "IPCP: Opened, session is now active\n");
// start IPv6 if configured and still in passive state
if (session[s].ppp.ipv6cp == Stopped)
{
- sendipv6cp(t, s);
+ sendipv6cp(s, t);
change_state(s, ipv6cp, RequestSent);
}
}
// Process IPCP messages
-void processipcp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l)
+void processipcp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l)
{
uint8_t b[MAXCONTROL];
uint8_t *q = 0;
return;
}
+ LOG(3, s, t, "IPCP: recv %s\n", ppp_code(*p));
+
if (*p == ConfigAck)
{
switch (session[s].ppp.ipcp)
break;
case AckSent:
- ipcp_open(t, s);
+ ipcp_open(s, t);
break;
default:
int gotip = 0;
in_addr_t addr;
- LOG(3, s, t, "IPCP: ConfigReq received\n");
-
while (length > 2)
{
switch (*o)
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 || *response == ConfigRej)
+ if (!q || (q != oq && *response == ConfigRej))
{
sessionshutdown(s, "Can't negotiate IPCP.", 3, 0);
return;
else if (gotip)
{
// Send packet back as ConfigAck
- response = makeppp(b, sizeof(b), p, l, t, s, PPPIPCP);
+ response = makeppp(b, sizeof(b), p, l, s, t, PPPIPCP);
if (!response) return;
*response = ConfigAck;
}
switch (session[s].ppp.ipcp)
{
case Closed:
- response = makeppp(b, sizeof(b), p, 2, t, s, PPPIPCP);
+ response = makeppp(b, sizeof(b), p, 2, s, t, PPPIPCP);
if (!response) return;
*response = TerminateAck;
*((uint16_t *) (response + 2)) = htons(l = 4);
case AckReceived:
if (*response == ConfigAck)
- ipcp_open(t, s);
+ ipcp_open(s, t);
break;
return;
}
- LOG(3, s, t, "IPCP: Sending %s\n", ppp_code(*response));
+ LOG(3, s, t, "IPCP: send %s\n", ppp_code(*response));
tunnelsend(b, l + (response - b), t);
}
else if (*p == TerminateReq)
{
- LOG(3, s, t, "IPCP: Received TerminateReq. Sending TerminateAck\n");
*p = TerminateAck;
- q = makeppp(b, sizeof(b), p, l, t, s, PPPIPCP);
+ 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);
}
if (l > mru) l = mru;
*p = CodeRej;
- q = makeppp(b, sizeof(b), p, l, t, s, PPPIPCP);
+ q = makeppp(b, sizeof(b), p, l, s, t, PPPIPCP);
if (!q) return;
- LOG(3, s, t, "Unexpected IPCP code %s\n", ppp_code(code));
+ 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(tunnelidt t, sessionidt s)
+static void ipv6cp_open(sessionidt s, tunnelidt t)
{
LOG(3, s, t, "IPV6CP: Opened\n");
route6set(s, session[s].ipv6route, session[s].ipv6prefixlen, 1);
// Send an initial RA (TODO: Should we send these regularly?)
- send_ipv6_ra(t, s, NULL);
+ send_ipv6_ra(s, t, NULL);
}
// Process IPV6CP messages
-void processipv6cp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l)
+void processipv6cp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l)
{
uint8_t b[MAXCONTROL];
uint8_t *q = 0;
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, t, s, PPPIPV6CP);
+ q = makeppp(b, sizeof(b), p, l, s, t, PPPIPV6CP);
if (!q) return;
tunnelsend(b, l + (q - b), t);
return;
break;
case AckSent:
- ipv6cp_open(t, s);
+ ipv6cp_open(s, t);
break;
default:
int gotip = 0;
uint8_t ident[8];
- LOG(3, s, t, "IPV6CP: ConfigReq received\n");
-
while (length > 2)
{
switch (*o)
else if (gotip)
{
// Send packet back as ConfigAck
- response = makeppp(b, sizeof(b), p, l, t, s, PPPIPV6CP);
+ response = makeppp(b, sizeof(b), p, l, s, t, PPPIPV6CP);
if (!response) return;
*response = ConfigAck;
}
switch (session[s].ppp.ipv6cp)
{
case Closed:
- response = makeppp(b, sizeof(b), p, 2, t, s, PPPIPV6CP);
+ response = makeppp(b, sizeof(b), p, 2, s, t, PPPIPV6CP);
if (!response) return;
*response = TerminateAck;
*((uint16_t *) (response + 2)) = htons(l = 4);
case AckReceived:
if (*response == ConfigAck)
- ipv6cp_open(t, s);
+ ipv6cp_open(s, t);
break;
return;
}
- LOG(3, s, t, "IPV6CP: Sending %s\n", ppp_code(*response));
+ LOG(3, s, t, "IPV6CP: send %s\n", ppp_code(*response));
tunnelsend(b, l + (response - b), t);
}
else if (*p == TerminateReq)
{
- LOG(3, s, t, "IPV6CP: Received TerminateReq. Sending TerminateAck\n");
*p = TerminateAck;
- q = makeppp(b, sizeof(b), p, l, t, s, PPPIPV6CP);
+ 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);
}
if (l > mru) l = mru;
*p = CodeRej;
- q = makeppp(b, sizeof(b), p, l, t, s, PPPIPV6CP);
+ q = makeppp(b, sizeof(b), p, l, s, t, PPPIPV6CP);
if (!q) return;
- LOG(3, s, t, "Unexpected IPV6CP code %s\n", ppp_code(code));
+ 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);
}
}
//
// This MUST be called with at least 4 byte behind 'p'.
// (i.e. this routine writes to p[-4]).
-void processipin(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l)
+void processipin(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l)
{
in_addr_t ip;
//
// This MUST be called with at least 4 byte behind 'p'.
// (i.e. this routine writes to p[-4]).
-void processipv6in(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l)
+void processipv6in(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l)
{
struct in6_addr ip;
in_addr_t ipv4;
*(uint32_t *)(p + 34) == 0 &&
*(p + 38) == 0 && *(p + 39) == 2 && *(p + 40) == 133) {
LOG(3, s, t, "Got IPv6 RS\n");
- send_ipv6_ra(t, s, &ip);
+ send_ipv6_ra(s, t, &ip);
return;
}
// Process CCP messages
-void processccp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l)
+void processccp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l)
{
uint8_t b[MAXCONTROL];
uint8_t *q;
STAT(tunnel_rx_errors);
}
+ LOG(3, s, t, "CCP: recv %s\n", ppp_code(*p));
if (*p == ConfigAck)
{
switch (session[s].ppp.ccp)
else // compression requested--reject
*p = ConfigRej;
- q = makeppp(b, sizeof(b), p, l, t, s, PPPCCP);
+ q = makeppp(b, sizeof(b), p, l, s, t, PPPCCP);
if (!q) return;
switch (session[s].ppp.ccp)
{
case Closed:
- q = makeppp(b, sizeof(b), p, 2, t, s, PPPCCP);
+ q = makeppp(b, sizeof(b), p, 2, s, t, PPPCCP);
if (!q) return;
*q = TerminateAck;
*((uint16_t *) (q + 2)) = htons(l = 4);
return;
}
- LOG(3, s, t, "CCP: Sending %s\n", ppp_code(*q));
+ LOG(3, s, t, "CCP: send %s\n", ppp_code(*q));
tunnelsend(b, l + (q - b), t);
}
else if (*p == TerminateReq)
{
- LOG(3, s, t, "CCP: Received TerminateReq. Sending TerminateAck\n");
*p = TerminateAck;
- q = makeppp(b, sizeof(b), p, l, t, s, PPPCCP);
+ q = makeppp(b, sizeof(b), p, l, s, t, PPPCCP);
if (!q) return;
+ LOG(3, s, t, "CCP: send %s\n", ppp_code(*q));
tunnelsend(b, l + (q - b), t);
change_state(s, ccp, Stopped);
}
if (l > mru) l = mru;
*p = CodeRej;
- q = makeppp(b, sizeof(b), p, l, t, s, PPPCCP);
+ q = makeppp(b, sizeof(b), p, l, s, t, PPPCCP);
if (!q) return;
- LOG(3, s, t, "Unexpected CCP code %s\n", ppp_code(code));
+ 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 challenge
-void sendchap(tunnelidt t, sessionidt s)
+void sendchap(sessionidt s, tunnelidt t)
{
uint8_t b[MAXCONTROL];
uint16_t r;
STAT(tunnel_tx_errors);
return ;
}
- q = makeppp(b, sizeof(b), 0, 0, t, s, PPPCHAP);
+ q = makeppp(b, sizeof(b), 0, 0, s, t, PPPCHAP);
if (!q) return;
*q = 1; // challenge
// fill in a L2TP message with a PPP frame,
// copies existing PPP message and changes magic number if seen
// returns start of PPP frame
-uint8_t *makeppp(uint8_t *b, int size, uint8_t *p, int l, tunnelidt t, sessionidt s, uint16_t mtype)
+uint8_t *makeppp(uint8_t *b, int size, uint8_t *p, int l, sessionidt s, tunnelidt t, uint16_t mtype)
{
if (size < 12) // Need more space than this!!
{
}
// Send initial LCP ConfigReq for MRU, authentication type and magic no
-void sendlcp(tunnelidt t, sessionidt s, int authtype)
+void sendlcp(sessionidt s, tunnelidt t, int authtype)
{
uint8_t b[500], *q, *l;
- if (!(q = makeppp(b, sizeof(b), NULL, 0, t, s, PPPLCP)))
+ if (!(q = makeppp(b, sizeof(b), NULL, 0, s, t, PPPLCP)))
return;
- LOG(4, s, t, "Sending LCP ConfigReq%s%s\n",
- authtype ? " for " : "",
- authtype ? (authtype == AUTHCHAP ? "CHAP" : "PAP") : "");
+ LOG(3, s, t, "LCP: send ConfigReq%s%s%s\n",
+ authtype ? " (" : "",
+ authtype ? (authtype == AUTHCHAP ? "CHAP" : "PAP") : "",
+ authtype ? ")" : "");
if (!session[s].mru)
session[s].mru = DEFAULT_MRU;
*(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(tunnelidt t, sessionidt s)
+void sendccp(sessionidt s, tunnelidt t)
{
uint8_t b[500], *q;
- if (!(q = makeppp(b, sizeof(b), NULL, 0, t, s, PPPCCP)))
+ if (!(q = makeppp(b, sizeof(b), NULL, 0, s, t, PPPCCP)))
return;
- LOG(4, s, t, "Sending CCP ConfigReq for no compression\n");
+ LOG(3, s, t, "CCP: send ConfigReq (no compression)\n");
+
*q = ConfigReq;
*(uint8_t *)(q + 1) = (time_now % 255) + 1; // ID
*(uint16_t *)(q + 2) = htons(4); // Length
projects / l2tpns.git / blobdiff