// L2TPNS PPP Stuff
-char const *cvs_id_ppp = "$Id: ppp.c,v 1.39 2004/12/16 08:49:53 bodea Exp $";
+char const *cvs_id_ppp = "$Id: ppp.c,v 1.45 2005/03/10 03:31:25 bodea Exp $";
#include <stdio.h>
#include <string.h>
// Process PAP messages
void processpap(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l)
{
- char user[129];
- char pass[129];
+ char user[MAXUSER];
+ char pass[MAXPASS];
uint16_t hl;
- CSTAT(call_processpap);
+ CSTAT(processpap);
LOG_HEX(5, "PAP", p, l);
if (l < 4)
{
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)
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;
}
radiussend(r, RADIUSAUTH);
}
-static char *ppp_lcp_types[] = {
- NULL,
- "ConfigReq",
- "ConfigAck",
- "ConfigNak",
- "ConfigRej",
- "TerminateReq",
- "TerminateAck",
- "CodeRej",
- "ProtocolRej",
- "EchoReq",
- "EchoReply",
- "DiscardRequest",
- "IdentRequest",
-};
-
static void dumplcp(uint8_t *p, int l)
{
int x = l - 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( ((uint16_t *) p)[1]) );
+ LOG(4, 0, 0, "PPP LCP Packet type %d (%s len %d)\n", *p, ppp_lcp_type((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(*(uint16_t *)(o + 2)));
+ LOG(4, 0, 0, " %s %d\n", lcp_type(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", lcp_type(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", lcp_types[type], asyncmap);
+ LOG(4, 0, 0, " %s %x\n", lcp_type(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", lcp_type(type), length);
break;
case 3: // Authentication-Protocol
if (length == 4)
{
int proto = ntohs(*(uint16_t *)(o + 2));
- LOG(4, 0, 0, " %s 0x%x (%s)\n", lcp_types[type], proto,
+ LOG(4, 0, 0, " %s 0x%x (%s)\n", lcp_type(type), proto,
proto == PPPCHAP ? "CHAP" :
proto == PPPPAP ? "PAP" : "UNKNOWN");
}
else
- LOG(4, 0, 0, " %s odd length %d\n", lcp_types[type], length);
+ LOG(4, 0, 0, " %s odd length %d\n", lcp_type(type), length);
break;
case 4: // Quality-Protocol
{
uint32_t qp = ntohl(*(uint32_t *)(o + 2));
- LOG(4, 0, 0, " %s %x\n", lcp_types[type], qp);
+ LOG(4, 0, 0, " %s %x\n", lcp_type(type), qp);
}
break;
case 5: // Magic-Number
if (length == 6)
{
uint32_t magicno = ntohl(*(uint32_t *)(o + 2));
- LOG(4, 0, 0, " %s %x\n", lcp_types[type], magicno);
+ LOG(4, 0, 0, " %s %x\n", lcp_type(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", lcp_type(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", lcp_type(type));
break;
default:
LOG(2, 0, 0, " Unknown PPP LCP Option type %d\n", type);
uint32_t magicno = 0;
uint16_t hl;
- CSTAT(call_processlcp);
+ CSTAT(processlcp);
LOG_HEX(5, "LCP", p, l);
if (l < 4)
*q = ConfigAck;
}
- LOG(3, s, t, "Sending %s\n", ppp_lcp_types[*response]);
+ LOG(3, s, t, "Sending %s\n", ppp_lcp_type(*response));
tunnelsend(b, l + (q - b), t);
if (!(session[s].flags & SF_LCP_ACKED))
{
sessionshutdown(s, "Connection closed.");
}
+ else if (*p == ProtocolRej)
+ {
+ if (*(uint16_t *) (p+4) == htons(PPPIPV6CP))
+ {
+ LOG(3, s, t, "IPv6 rejected\n");
+ session[s].flags |= SF_IPV6_NACKED;
+ }
+ else
+ {
+ LOG(1, s, t, "Unexpected LCP protocol reject 0x%X\n",
+ ntohs(*(uint16_t *) (p+4)));
+ STAT(tunnel_rx_errors);
+ }
+ }
else if (*p == EchoReq)
{
LOG(5, s, t, "LCP: Received EchoReq. Sending EchoReply\n");
{
uint16_t hl;
- CSTAT(call_processipcp);
+ CSTAT(processipcp);
LOG_HEX(5, "IPCP", p, l);
if (l < 5)
}
}
+// Process IPV6CP messages
+void processipv6cp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l)
+{
+
+ 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 (*p == ConfigAck)
+ {
+ // happy with our IPV6CP
+ session[s].flags |= SF_IPV6CP_ACKED;
+
+ LOG(3, s, t, "IPV6CP Acked, IPv6 is now active\n");
+ // Add a routed block if configured.
+ if (session[s].ipv6prefixlen)
+ {
+ route6set(s, session[s].ipv6route, session[s].ipv6prefixlen, 1);
+ session[s].flags |= SF_IPV6_ROUTED;
+ }
+
+ // Send an initial RA (TODO: Should we send these regularly?)
+ send_ipv6_ra(t, s, NULL);
+ return;
+ }
+ if (*p != ConfigReq)
+ {
+ LOG(1, s, t, "Unexpected IPV6CP code %d\n", *p);
+ STAT(tunnel_rx_errors);
+ return;
+ }
+
+ LOG(4, s, t, "IPV6CP ConfigReq received\n");
+ if (ntohs(*(uint16_t *) (p + 2)) > l)
+ {
+ LOG(1, s, t, "Length mismatch IPV6CP %d/%d\n", ntohs(*(uint16_t *) (p + 2)), l);
+ STAT(tunnel_rx_errors);
+ return ;
+ }
+ if (!session[s].ip)
+ {
+ LOG(3, s, t, "Waiting on radius reply\n");
+ return; // have to wait on RADIUS reply
+ }
+ // form a config reply quoting the IP in the session
+ {
+ uint8_t b[MAXCONTROL];
+ uint8_t *i,
+ *q;
+
+ l = ntohs(*(uint16_t *) (p + 2)); // We must use length from IPV6CP len field
+ q = p + 4;
+ i = p + l;
+ while (q < i && q[1])
+ {
+ if (*q != 1)
+ break;
+ q += q[1];
+ }
+ if (q < i)
+ {
+ // reject
+ uint16_t n = 4;
+ i = p + l;
+ if (!(q = makeppp(b, sizeof(b), p, l, t, s, PPPIPV6CP)))
+ {
+ LOG(2, s, t, "Failed to send IPV6CP ConfigRej\n");
+ return;
+ }
+ *q = ConfigRej;
+ p += 4;
+ while (p < i && p[1])
+ {
+ if (*p != 1)
+ {
+ LOG(2, s, t, "IPV6CP reject %d\n", *p);
+ memcpy(q + n, p, p[1]);
+ n += p[1];
+ }
+ p += p[1];
+ }
+ *(uint16_t *) (q + 2) = htons(n);
+ LOG(4, s, t, "Sending ConfigRej\n");
+ tunnelsend(b, n + (q - b), t); // send it
+ }
+ else
+ {
+ LOG(4, s, t, "Sending ConfigAck\n");
+ *p = ConfigAck;
+ i = findppp(p, 1); // IP address
+ if (!i || i[1] != 10)
+ {
+ LOG(1, s, t, "No IP in IPV6CP request\n");
+ STAT(tunnel_rx_errors);
+ return ;
+ }
+ if ((*(uint32_t *) (i + 2) != htonl(session[s].ip)) ||
+ (*(uint32_t *) (i + 6) != 0))
+ {
+ *(uint32_t *) (i + 2) = htonl(session[s].ip);
+ *(uint32_t *) (i + 6) = 0;
+ *p = ConfigNak;
+ LOG(4, s, t,
+ " No, a ConfigNak, client is "
+ "requesting IP - sending %s\n",
+ fmtaddr(htonl(session[s].ip), 0));
+ }
+ if (!(q = makeppp(b, sizeof(b), p, l, t, s, PPPIPV6CP)))
+ {
+ LOG(2, s, t, " Failed to send IPV6CP packet.\n");
+ return;
+ }
+ tunnelsend(b, l + (q - b), t); // send it
+ }
+ }
+}
+
// process IP packet received
//
// This MUST be called with at least 4 byte behind 'p'.
{
in_addr_t ip;
- CSTAT(call_processipin);
+ CSTAT(processipin);
LOG_HEX(5, "IP", p, l);
// Add on the tun header
p -= 4;
- *(uint32_t *) p = htonl(0x00000800);
+ *(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;
+ }
+
+ 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);
+ }
+
+ session[s].cin += l - 4;
+ session[s].total_cin += l - 4;
+ sess_local[s].cin += l - 4;
+
+ session[s].pin++;
+ eth_tx += l - 4;
+
+ STAT(tun_tx_packets);
+ INC_STAT(tun_tx_bytes, l - 4);
+}
+
+// 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(tunnelidt t, sessionidt s, 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 ;
+ }
+
+ // 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(t, s, &ip);
+ return;
+ }
+
+ // Add on the tun header
+ p -= 4;
+ *(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;
}
session[s].cin += l - 4;
session[s].total_cin += l - 4;
- sess_count[s].cin += l - 4;
+ sess_local[s].cin += l - 4;
session[s].pin++;
eth_tx += l - 4;
// Increment packet counters
session[s].cin += len - 4;
session[s].total_cin += len - 4;
- sess_count[s].cin += len - 4;
+ sess_local[s].cin += len - 4;
session[s].pin++;
eth_tx += len - 4;
uint8_t b[MAXCONTROL];
uint8_t *q;
- CSTAT(call_processccp);
+ CSTAT(processccp);
LOG_HEX(5, "CCP", p, l);
switch (l > 1 ? *p : 0)
uint16_t r = session[s].radius;
uint8_t *q;
- CSTAT(call_sendchap);
+ CSTAT(sendchap);
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();
- }
+
+ // new challenge
+ random_data(radius[r].auth, sizeof(radius[r].auth));
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)
projects / l2tpns.git / blobdiff