// Copyright (c) 2002 FireBrick (Andrews & Arnold Ltd / Watchfront Ltd) - GPL licenced
// vim: sw=8 ts=8
-char const *cvs_id_l2tpns = "$Id: l2tpns.c,v 1.11 2004/07/07 09:09:53 bodea Exp $";
+char const *cvs_id_l2tpns = "$Id: l2tpns.c,v 1.12 2004/07/08 16:54:35 bodea Exp $";
#include <arpa/inet.h>
#include <assert.h>
#include <stdarg.h>
#include <stdlib.h>
#include <stdio.h>
-#define __USE_GNU
#include <string.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
// Globals
struct configt *config = NULL; // all configuration
-int tapfd = -1; // tap interface file handle
+int tunfd = -1; // tun interface file handle. (network device)
int udpfd = -1; // UDP file handle
int controlfd = -1; // Control signal handle
int snoopfd = -1; // UDP file handle for sending out intercept data
int ifrfd = -1; // File descriptor for routing, etc
time_t basetime = 0; // base clock
char hostname[1000] = ""; // us.
-u16 tapmac[3]; // MAC of tap interface
-int tapidx; // ifr_ifindex of tap device
+int tunidx; // ifr_ifindex of tun device
u32 sessionid = 0; // session id for radius accounting
int syslog_log = 0; // are we logging to syslog
-FILE *log_stream = NULL;
-struct sockaddr_in snoop_addr = {0};
-extern int cluster_sockfd;
-u32 last_sid = 0;
-int clifd = 0;
-sessionidt *cli_session_kill = NULL;
-tunnelidt *cli_tunnel_kill = NULL;
-static void *ip_hash[256];
-u32 udp_tx = 0, udp_rx = 0, udp_rx_pkt = 0;
+FILE *log_stream = NULL; // file handle for direct logging (i.e. direct into file, not via syslog).
+extern int cluster_sockfd; // Intra-cluster communications socket.
+u32 last_sid = 0; // Last used PPP SID. Can I kill this?? -- mo
+int clifd = 0; // Socket listening for CLI connections.
+
+struct cli_session_actions *cli_session_actions = NULL; // Pending session changes requested by CLI
+struct cli_tunnel_actions *cli_tunnel_actions = NULL; // Pending tunnel changes required by CLI
+
+static void *ip_hash[256]; // Mapping from IP address to session structures.
+
+u32 udp_tx = 0, udp_rx = 0, udp_rx_pkt = 0; // Global traffic counters.
u32 eth_tx = 0, eth_rx = 0, eth_rx_pkt = 0;
-u32 ip_pool_size = 1;
-time_t time_now = 0;
-char time_now_string[64] = {0};
-char main_quit = 0;
+u32 ip_pool_size = 1; // Size of the pool of addresses used for dynamic address allocation.
+time_t time_now = 0; // Current time in seconds since epoch.
+char time_now_string[64] = {0}; // Current time as a string.
+char main_quit = 0; // True if we're in the process of exiting.
char *_program_name = NULL;
linked_list *loaded_plugins;
linked_list *plugins[MAX_PLUGIN_TYPES];
#define max_plugin_functions (sizeof(plugin_functions) / sizeof(char *))
-tunnelt *tunnel = NULL; // 1000 * 45 = 45000 = 45k
-sessiont *session = NULL; // 5000 * 213 = 1065000 = 1 Mb
-sessioncountt *sess_count = NULL;
-radiust *radius = NULL;
-ippoolt *ip_address_pool = NULL;
+tunnelt *tunnel = NULL; // Array of tunnel structures.
+sessiont *session = NULL; // Array of session structures.
+sessioncountt *sess_count = NULL; // Array of partial per-session traffic counters.
+radiust *radius = NULL; // Array of radius structures.
+ippoolt *ip_address_pool = NULL; // Array of dynamic IP addresses.
controlt *controlfree = 0;
struct Tstats *_statistics = NULL;
#ifdef RINGBUFFER
static void cache_ipmap(ipt ip, int s);
static void uncache_ipmap(ipt ip);
-// return internal time (10ths since run)
+// return internal time (10ths since process startup)
clockt now(void)
{
struct timeval t;
}
// work out a retry time based on try number
+// This is a straight bounded exponential backoff.
+// Maximum re-try time is 32 seconds. (2^5).
clockt backoff(u8 try)
{
if (try > 5) try = 5; // max backoff
return now() + 10 * (1 << try);
}
+
+//
+// Log a debug message.
+//
void _log(int level, ipt address, sessionidt s, tunnelidt t, const char *format, ...)
{
static char message[65536] = {0};
ip &= mask; // Force the ip to be the first one in the route.
memset(&r, 0, sizeof(r));
- r.rt_dev = config->tapdevice;
+ r.rt_dev = config->tundevice;
r.rt_dst.sa_family = AF_INET;
*(u32 *) & (((struct sockaddr_in *) &r.rt_dst)->sin_addr.s_addr) = htonl(ip);
r.rt_gateway.sa_family = AF_INET;
}
}
-// Set up TAP interface
-void inittap(void)
+//
+// Set up TUN interface
+void inittun(void)
{
struct ifreq ifr;
struct sockaddr_in sin = {0};
memset(&ifr, 0, sizeof(ifr));
ifr.ifr_flags = IFF_TUN;
- tapfd = open(TAPDEVICE, O_RDWR);
- if (tapfd < 0)
+ tunfd = open(TUNDEVICE, O_RDWR);
+ if (tunfd < 0)
{ // fatal
- log(0, 0, 0, 0, "Can't open %s: %s\n", TAPDEVICE, strerror(errno));
+ log(0, 0, 0, 0, "Can't open %s: %s\n", TUNDEVICE, strerror(errno));
exit(1);
}
{
- int flags = fcntl(tapfd, F_GETFL, 0);
- fcntl(tapfd, F_SETFL, flags | O_NONBLOCK);
+ int flags = fcntl(tunfd, F_GETFL, 0);
+ fcntl(tunfd, F_SETFL, flags | O_NONBLOCK);
}
- if (ioctl(tapfd, TUNSETIFF, (void *) &ifr) < 0)
+ if (ioctl(tunfd, TUNSETIFF, (void *) &ifr) < 0)
{
- log(0, 0, 0, 0, "Can't set tap interface: %s\n", strerror(errno));
+ log(0, 0, 0, 0, "Can't set tun interface: %s\n", strerror(errno));
exit(1);
}
- assert(strlen(ifr.ifr_name) < sizeof(config->tapdevice));
- strncpy(config->tapdevice, ifr.ifr_name, sizeof(config->tapdevice) - 1);
+ assert(strlen(ifr.ifr_name) < sizeof(config->tundevice));
+ strncpy(config->tundevice, ifr.ifr_name, sizeof(config->tundevice) - 1);
ifrfd = socket(PF_INET, SOCK_DGRAM, IPPROTO_IP);
sin.sin_family = AF_INET;
log(0, 0, 0, 0, "Error setting tun flags: %s\n", strerror(errno));
exit(1);
}
- if (ioctl(ifrfd, SIOCGIFHWADDR, (void *) &ifr) < 0)
- {
- log(0, 0, 0, 0, "Error setting tun hardware address: %s\n", strerror(errno));
- exit(1);
- }
- memcpy(&tapmac, 2 + (u8 *) & ifr.ifr_hwaddr, 6);
if (ioctl(ifrfd, SIOCGIFINDEX, (void *) &ifr) < 0)
{
log(0, 0, 0, 0, "Error setting tun ifindex: %s\n", strerror(errno));
exit(1);
}
- tapidx = ifr.ifr_ifindex;
+ tunidx = ifr.ifr_ifindex;
}
// set up UDP port
exit(1);
}
snoopfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
- snoop_addr.sin_family = AF_INET;
// Control
memset(&addr, 0, sizeof(addr));
return val;
}
-// Handle ARP requests
-void processarp(u8 * buf, int len)
-{
- ipt ip;
- sessionidt s;
-
- CSTAT(call_processarp);
- STAT(arp_recv);
-
- if (len != 46)
- {
- log(0, 0, 0, 0, "Unexpected length ARP %d bytes\n", len);
- STAT(arp_errors);
- return;
- }
- if (*(u16 *) (buf + 16) != htons(PKTARP))
- {
- log(0, 0, 0, 0, "Unexpected ARP type %04X\n", ntohs(*(u16 *) (buf + 16)));
- STAT(arp_errors);
- return;
- }
- if (*(u16 *) (buf + 18) != htons(0x0001))
- {
- log(0, 0, 0, 0, "Unexpected ARP hard type %04X\n", ntohs(*(u16 *) (buf + 18)));
- STAT(arp_errors);
- return;
- }
- if (*(u16 *) (buf + 20) != htons(PKTIP))
- {
- log(0, 0, 0, 0, "Unexpected ARP prot type %04X\n", ntohs(*(u16 *) (buf + 20)));
- STAT(arp_errors);
- return;
- }
- if (buf[22] != 6)
- {
- log(0, 0, 0, 0, "Unexpected ARP hard len %d\n", buf[22]);
- STAT(arp_errors);
- return;
- }
- if (buf[23] != 4)
- {
- log(0, 0, 0, 0, "Unexpected ARP prot len %d\n", buf[23]);
- STAT(arp_errors);
- return;
- }
- if (*(u16 *) (buf + 24) != htons(0x0001))
- {
- log(0, 0, 0, 0, "Unexpected ARP op %04X\n", ntohs(*(u16 *) (buf + 24)));
- STAT(arp_errors);
- return;
- }
- ip = *(u32 *) (buf + 42);
- // look up session
- s = sessionbyip(ip);
- if (s)
- {
- log(3, ntohl(ip), s, session[s].tunnel, "ARP reply for %s\n", inet_toa(ip));
- memcpy(buf + 4, buf + 10, 6); // set destination as source
- *(u16 *) (buf + 10) = htons(tapmac[0]); // set source address
- *(u16 *) (buf + 12) = htons(tapmac[1]);
- *(u16 *) (buf + 14) = htons(tapmac[2]);
- *(u16 *) (buf + 24) = htons(0x0002); // ARP reply
- memcpy(buf + 26, buf + 10, 6); // sender ethernet
- memcpy(buf + 36, buf + 4, 6); // target ethernet
- *(u32 *) (buf + 42) = *(u32 *) (buf + 32); // target IP
- *(u32 *) (buf + 32) = ip; // sender IP
- write(tapfd, buf, len);
- STAT(arp_replies);
- }
- else
- {
- log(3, ntohl(ip), 0, 0, "ARP request for unknown IP %s\n", inet_toa(ip));
- STAT(arp_discarded);
- }
-}
-
// actually send a control message for a specific tunnel
void tunnelsend(u8 * buf, u16 l, tunnelidt t)
{
//
int tun_write(u8 * data, int size)
{
- return write(tapfd, data, size);
+ return write(tunfd, data, size);
}
// process outgoing (to tunnel) IP
log(5, session[s].ip, s, t, "Ethernet -> Tunnel (%d bytes)\n", len);
- // Snooping this session, send it to intercept box
+ // Snooping this session.
if (sp->snoop_ip && sp->snoop_port)
snoop_send_packet(buf, len, sp->snoop_ip, sp->snoop_port);
session[s].tunnel = T_FREE; // Mark it as free.
session[s].next = sessionfree;
sessionfree = s;
+ cli_session_actions[s].action = 0;
cluster_send_session(s);
}
// free tunnel
tunnelclear(t);
- cluster_send_tunnel(t);
log(1, 0, 0, t, "Kill tunnel %d: %s\n", t, reason);
- tunnel[t].die = 0;
- tunnel[t].state = TUNNELFREE;
+ cli_tunnel_actions[s].action = 0;
+ cluster_send_tunnel(t);
}
// shut down a tunnel cleanly
log(4, ntohl(addr->sin_addr.s_addr), s, t, " Error Code %d: %s\n",
errcode, errdesc);
}
- if (n > 4) {
- /* %*s doesn't work?? */
- char *buf = (char *)strndup(b+4, n-4);
- log(4, ntohl(addr->sin_addr.s_addr), s, t, " Error String: %s\n",
- buf);
- free(buf);
- }
+ if (n > 4)
+ log(4, ntohl(addr->sin_addr.s_addr), s, t, " Error String: %.*s\n",
+ n-4, b+4);
+
break;
}
break;
}
}
-// read and process packet on tap
-void processtap(u8 * buf, int len)
+// read and process packet on tun
+void processtun(u8 * buf, int len)
{
- log_hex(5, "Receive TAP Data", buf, len);
- STAT(tap_rx_packets);
- INC_STAT(tap_rx_bytes, len);
+ log_hex(5, "Receive TUN Data", buf, len);
+ STAT(tun_rx_packets);
+ INC_STAT(tun_rx_bytes, len);
- CSTAT(call_processtap);
+ CSTAT(call_processtun);
eth_rx_pkt++;
eth_rx += len;
if (len < 22)
{
- log(1, 0, 0, 0, "Short tap packet %d bytes\n", len);
- STAT(tap_rx_errors);
+ log(1, 0, 0, 0, "Short tun packet %d bytes\n", len);
+ STAT(tun_rx_errors);
return;
}
- if (*(u16 *) (buf + 2) == htons(PKTARP)) // ARP
- processarp(buf, len);
- else if (*(u16 *) (buf + 2) == htons(PKTIP)) // IP
+
+ if (*(u16 *) (buf + 2) == htons(PKTIP)) // IP
processipout(buf, len);
// Else discard.
}
int count=0,i;
u16 r;
static clockt next_acct = 0;
+ int a;
log(3, 0, 0, 0, "Begin regular cleanup\n");
controladd(c, t, 0); // send the message
log(3, tunnel[t].ip, 0, t, "Sending HELLO message\n");
}
- }
- // Check for sessions that have been killed from the CLI
- if (cli_session_kill[0])
- {
- int i;
- for (i = 0; i < MAXSESSION && cli_session_kill[i]; i++)
- {
- log(2, 0, cli_session_kill[i], 0, "Dropping session by CLI\n");
- sessionshutdown(cli_session_kill[i], "Requested by administrator");
- cli_session_kill[i] = 0;
- }
- }
- // Check for tunnels that have been killed from the CLI
- if (cli_tunnel_kill[0])
- {
- int i;
- for (i = 1; i < MAXTUNNEL && cli_tunnel_kill[i]; i++)
+ // Check for tunnel changes requested from the CLI
+ if ((a = cli_tunnel_actions[t].action))
{
- log(2, 0, cli_tunnel_kill[i], 0, "Dropping tunnel by CLI\n");
- tunnelshutdown(cli_tunnel_kill[i], "Requested by administrator");
- cli_tunnel_kill[i] = 0;
+ cli_tunnel_actions[t].action = 0;
+ if (a & CLI_TUN_KILL)
+ {
+ log(2, tunnel[t].ip, 0, t, "Dropping tunnel by CLI\n");
+ tunnelshutdown(t, "Requested by administrator");
+ }
}
+
}
count = 0;
for (i = 1; i <= config->cluster_highest_sessionid; i++)
{
-
s++;
if (s > config->cluster_highest_sessionid)
s = 1;
if (++count >= MAX_ACTIONS) break;
continue;
}
+
+ // Check for actions requested from the CLI
+ if ((a = cli_session_actions[s].action))
+ {
+ int send = 0;
+
+ cli_session_actions[s].action = 0;
+ if (a & CLI_SESS_KILL)
+ {
+ log(2, 0, s, session[s].tunnel, "Dropping session by CLI\n");
+ sessionshutdown(s, "Requested by administrator");
+ a = 0; // dead, no need to check for other actions
+ }
+
+ if (a & CLI_SESS_SNOOP)
+ {
+ log(2, 0, s, session[s].tunnel, "Snooping session by CLI (to %s:%d)\n",
+ inet_toa(cli_session_actions[s].snoop_ip), cli_session_actions[s].snoop_port);
+
+ session[s].snoop_ip = cli_session_actions[s].snoop_ip;
+ session[s].snoop_port = cli_session_actions[s].snoop_port;
+ send++;
+ }
+
+ if (a & CLI_SESS_NOSNOOP)
+ {
+ log(2, 0, s, session[s].tunnel, "Unsnooping session by CLI\n");
+ session[s].snoop_ip = 0;
+ session[s].snoop_port = 0;
+ send++;
+ }
+
+ if (a & CLI_SESS_THROTTLE)
+ {
+ log(2, 0, s, session[s].tunnel, "Throttling session by CLI (to %d)\n",
+ cli_session_actions[s].throttle);
+
+ throttle_session(s, cli_session_actions[s].throttle);
+ }
+
+ if (a & CLI_SESS_NOTHROTTLE)
+ {
+ log(2, 0, s, session[s].tunnel, "Un-throttling session by CLI\n");
+ throttle_session(s, 0);
+ }
+
+ if (send)
+ cluster_send_session(s);
+
+ if (++count >= MAX_ACTIONS) break;
+ continue;
+ }
}
+
if (config->accounting_dir && next_acct <= TIME)
{
// Dump accounting data
return 0;
}
-// main loop - gets packets on tap or udp and processes them
+// main loop - gets packets on tun or udp and processes them
void mainloop(void)
{
fd_set cr;
clockt next_cluster_ping = 0; // send initial ping immediately
time_t next_clean = time_now + config->cleanup_interval;
- log(4, 0, 0, 0, "Beginning of main loop. udpfd=%d, tapfd=%d, cluster_sockfd=%d, controlfd=%d\n",
- udpfd, tapfd, cluster_sockfd, controlfd);
+ log(4, 0, 0, 0, "Beginning of main loop. udpfd=%d, tunfd=%d, cluster_sockfd=%d, controlfd=%d\n",
+ udpfd, tunfd, cluster_sockfd, controlfd);
FD_ZERO(&cr);
FD_SET(udpfd, &cr);
- FD_SET(tapfd, &cr);
+ FD_SET(tunfd, &cr);
FD_SET(controlfd, &cr);
FD_SET(clifd, &cr);
if (cluster_sockfd) FD_SET(cluster_sockfd, &cr);
cn = udpfd;
- if (cn < tapfd) cn = tapfd;
+ if (cn < tunfd) cn = tunfd;
if (cn < controlfd) cn = controlfd;
if (cn < clifd) cn = clifd;
if (cn < cluster_sockfd) cn = cluster_sockfd;
break;
}
}
- if (FD_ISSET(tapfd, &r))
+ if (FD_ISSET(tunfd, &r))
{
int c, n;
for (c = 0; c < config->multi_read_count; c++)
{
- if ((n = read(tapfd, buf, sizeof(buf))) > 0)
- processtap(buf, n);
+ if ((n = read(tunfd, buf, sizeof(buf))) > 0)
+ processtun(buf, n);
else
break;
}
if (cluster_sockfd && next_cluster_ping <= TIME)
{
// Check to see which of the cluster is still alive..
- cluster_send_ping(basetime);
- cluster_check_master();
+
+ cluster_send_ping(basetime); // Only does anything if we're a slave
+ cluster_check_master(); // ditto.
+
cluster_heartbeat(); // Only does anything if we're a master.
+ cluster_check_slaves(); // ditto.
+
master_update_counts(); // If we're a slave, send our byte counters to our master.
+
if (config->cluster_iam_master && !config->cluster_iam_uptodate)
next_cluster_ping = TIME + 1; // out-of-date slaves, do fast updates
else
memset(ringbuffer, 0, sizeof(struct Tringbuffer));
#endif
- cli_session_kill = mmap(NULL, sizeof(sessionidt) * MAXSESSION, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS, 0, 0);
- if (cli_session_kill == MAP_FAILED)
+ cli_session_actions = mmap(NULL, sizeof(struct cli_session_actions) * MAXSESSION, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS, 0, 0);
+ if (cli_session_actions == MAP_FAILED)
{
- log(0, 0, 0, 0, "Error doing mmap for cli session kill: %s\n", strerror(errno));
+ log(0, 0, 0, 0, "Error doing mmap for cli session actions: %s\n", strerror(errno));
exit(1);
}
- memset(cli_session_kill, 0, sizeof(sessionidt) * MAXSESSION);
- cli_tunnel_kill = mmap(NULL, sizeof(tunnelidt) * MAXSESSION, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS, 0, 0);
- if (cli_tunnel_kill == MAP_FAILED)
+ memset(cli_session_actions, 0, sizeof(struct cli_session_actions) * MAXSESSION);
+ cli_tunnel_actions = mmap(NULL, sizeof(struct cli_tunnel_actions) * MAXSESSION, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS, 0, 0);
+ if (cli_tunnel_actions == MAP_FAILED)
{
- log(0, 0, 0, 0, "Error doing mmap for cli tunnel kill: %s\n", strerror(errno));
+ log(0, 0, 0, 0, "Error doing mmap for cli tunnel actions: %s\n", strerror(errno));
exit(1);
}
- memset(cli_tunnel_kill, 0, sizeof(tunnelidt) * MAXSESSION);
+ memset(cli_tunnel_actions, 0, sizeof(struct cli_tunnel_actions) * MAXSESSION);
memset(tunnel, 0, sizeof(tunnelt) * MAXTUNNEL);
memset(session, 0, sizeof(sessiont) * MAXSESSION);
void snoop_send_packet(char *packet, u16 size, ipt destination, u16 port)
{
+ struct sockaddr_in snoop_addr = {0};
if (!destination || !port || snoopfd <= 0 || size <= 0 || !packet)
return;
+ snoop_addr.sin_family = AF_INET;
snoop_addr.sin_addr.s_addr = destination;
snoop_addr.sin_port = ntohs(port);
// Start the timer routine off
time(&time_now);
- strftime(time_now_string, 64, "%Y-%m-%d %H:%M:%S", localtime(&time_now));
+ strftime(time_now_string, sizeof(time_now_string), "%Y-%m-%d %H:%M:%S", localtime(&time_now));
signal(SIGALRM, sigalrm_handler);
siginterrupt(SIGALRM, 0);
config->bgp_peer_as[1], 0);
#endif /* BGP */
- inittap();
- log(1, 0, 0, 0, "Set up on interface %s\n", config->tapdevice);
+ inittun();
+ log(1, 0, 0, 0, "Set up on interface %s\n", config->tundevice);
initudp();
initrad();
// Update the internal time counter
time(&time_now);
- strftime(time_now_string, 64, "%Y-%m-%d %H:%M:%S", localtime(&time_now));
+ strftime(time_now_string, sizeof(time_now_string), "%Y-%m-%d %H:%M:%S", localtime(&time_now));
alarm(1);
{
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