// L2TP Network Server
// Adrian Kennard 2002
-// Copyright (c) 2003, 2004, 2005 Optus Internet Engineering
+// Copyright (c) 2003, 2004, 2005, 2006 Optus Internet Engineering
// 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 1.121 2005/08/11 05:50:24 bodea Exp $";
+char const *cvs_id_l2tpns = "$Id: l2tpns.c,v 1.169 2006/07/01 12:40:17 bodea Exp $";
#include <arpa/inet.h>
#include <assert.h>
static FILE *log_stream = 0; // file handle for direct logging (i.e. direct into file, not via syslog).
uint32_t last_id = 0; // Unique ID for radius accounting
+// calculated from config->l2tp_mtu
+uint16_t MRU = 0; // PPP MRU
+uint16_t MSS = 0; // TCP MSS
+
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 uint32_t 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.
static char time_now_string[64] = {0}; // Current time as a string.
+static int time_changed = 0; // time_now changed
char main_quit = 0; // True if we're in the process of exiting.
+static char main_reload = 0; // Re-load pending
linked_list *loaded_plugins;
linked_list *plugins[MAX_PLUGIN_TYPES];
CONFIG("log_file", log_filename, STRING),
CONFIG("pid_file", pid_file, STRING),
CONFIG("random_device", random_device, STRING),
- CONFIG("l2tp_secret", l2tpsecret, STRING),
+ CONFIG("l2tp_secret", l2tp_secret, STRING),
+ CONFIG("l2tp_mtu", l2tp_mtu, INT),
CONFIG("ppp_restart_time", ppp_restart_time, INT),
CONFIG("ppp_max_configure", ppp_max_configure, INT),
CONFIG("ppp_max_failure", ppp_max_failure, INT),
CONFIG("radius_secret", radiussecret, STRING),
CONFIG("radius_authtypes", radius_authtypes_s, STRING),
CONFIG("radius_dae_port", radius_dae_port, SHORT),
+ CONFIG("radius_bind_min", radius_bind_min, SHORT),
+ CONFIG("radius_bind_max", radius_bind_max, SHORT),
CONFIG("allow_duplicate_users", allow_duplicate_users, BOOL),
+ CONFIG("guest_account", guest_user, STRING),
CONFIG("bind_address", bind_address, IPv4),
CONFIG("peer_address", peer_address, IPv4),
CONFIG("send_garp", send_garp, BOOL),
CONFIG("throttle_speed", rl_rate, UNSIGNED_LONG),
CONFIG("throttle_buckets", num_tbfs, INT),
CONFIG("accounting_dir", accounting_dir, STRING),
- CONFIG("setuid", target_uid, INT),
CONFIG("dump_speed", dump_speed, BOOL),
CONFIG("multi_read_count", multi_read_count, INT),
CONFIG("scheduler_fifo", scheduler_fifo, BOOL),
CONFIG("packet_limit", max_packets, INT),
CONFIG("cluster_address", cluster_address, IPv4),
CONFIG("cluster_interface", cluster_interface, STRING),
+ CONFIG("cluster_mcast_ttl", cluster_mcast_ttl, INT),
CONFIG("cluster_hb_interval", cluster_hb_interval, INT),
CONFIG("cluster_hb_timeout", cluster_hb_timeout, INT),
CONFIG("cluster_master_min_adv", cluster_master_min_adv, INT),
"plugin_control",
"plugin_radius_response",
"plugin_radius_reset",
+ "plugin_radius_account",
"plugin_become_master",
"plugin_new_session_master",
};
static sessionidt shut_acct_n = 0;
tunnelt *tunnel = NULL; // Array of tunnel structures.
+bundlet *bundle = NULL; // Array of bundle structures.
+fragmentationt *frag = NULL; // Array of fragmentation structures.
sessiont *session = NULL; // Array of session structures.
sessionlocalt *sess_local = NULL; // Array of local per-session counters.
radiust *radius = NULL; // Array of radius structures.
static void free_ip_address(sessionidt s);
static void dump_acct_info(int all);
static void sighup_handler(int sig);
-static void sigalrm_handler(int sig);
static void shutdown_handler(int sig);
static void sigchild_handler(int sig);
static void build_chap_response(uint8_t *challenge, uint8_t id, uint16_t challenge_length, uint8_t **challenge_response);
static int add_plugin(char *plugin_name);
static int remove_plugin(char *plugin_name);
static void plugins_done(void);
-static void processcontrol(uint8_t *buf, int len, struct sockaddr_in *addr, int alen);
+static void processcontrol(uint8_t *buf, int len, struct sockaddr_in *addr, int alen, struct in_addr *local);
static tunnelidt new_tunnel(void);
static void unhide_value(uint8_t *value, size_t len, uint16_t type, uint8_t *vector, size_t vec_len);
+static void bundleclear(bundleidt b);
// on slaves, alow BGP to withdraw cleanly before exiting
#define QUIT_DELAY 5
#define QUIT_SHUTDOWN 2 // SIGQUIT: shutdown sessions/tunnels, reject new connections
// return internal time (10ths since process startup), set f if given
+// as a side-effect sets time_now, and time_changed
static clockt now(double *f)
{
struct timeval t;
gettimeofday(&t, 0);
if (f) *f = t.tv_sec + t.tv_usec / 1000000.0;
+ if (t.tv_sec != time_now)
+ {
+ time_now = t.tv_sec;
+ time_changed++;
+ }
return (t.tv_sec - basetime) * 10 + t.tv_usec / 100000 + 1;
}
LOG(0, 0, 0, "Error setting tun queue length: %s\n", strerror(errno));
exit(1);
}
+ /* set MTU to modem MRU */
+ ifr.ifr_mtu = MRU;
+ if (ioctl(ifrfd, SIOCSIFMTU, (void *) &ifr) < 0)
+ {
+ LOG(0, 0, 0, "Error setting tun MTU: %s\n", strerror(errno));
+ exit(1);
+ }
ifr.ifr_flags = IFF_UP;
if (ioctl(ifrfd, SIOCSIFFLAGS, (void *) &ifr) < 0)
{
int flags = fcntl(udpfd, F_GETFL, 0);
fcntl(udpfd, F_SETFL, flags | O_NONBLOCK);
}
- if (bind(udpfd, (void *) &addr, sizeof(addr)) < 0)
+ if (bind(udpfd, (struct sockaddr *) &addr, sizeof(addr)) < 0)
{
LOG(0, 0, 0, "Error in UDP bind: %s\n", strerror(errno));
exit(1);
addr.sin_port = htons(NSCTL_PORT);
controlfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
setsockopt(controlfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
- if (bind(controlfd, (void *) &addr, sizeof(addr)) < 0)
+ setsockopt(controlfd, SOL_IP, IP_PKTINFO, &on, sizeof(on)); // recvfromto
+ if (bind(controlfd, (struct sockaddr *) &addr, sizeof(addr)) < 0)
{
LOG(0, 0, 0, "Error in control bind: %s\n", strerror(errno));
exit(1);
addr.sin_port = htons(config->radius_dae_port);
daefd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
setsockopt(daefd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
- if (bind(daefd, (void *) &addr, sizeof(addr)) < 0)
+ setsockopt(daefd, SOL_IP, IP_PKTINFO, &on, sizeof(on)); // recvfromto
+ if (bind(daefd, (struct sockaddr *) &addr, sizeof(addr)) < 0)
{
LOG(0, 0, 0, "Error in DAE bind: %s\n", strerror(errno));
exit(1);
if (!t)
{
- static int backtrace_count = 0;
LOG(0, 0, t, "tunnelsend called with 0 as tunnel id\n");
STAT(tunnel_tx_errors);
- log_backtrace(backtrace_count, 5)
return;
}
if (!tunnel[t].ip)
{
- static int backtrace_count = 0;
LOG(1, 0, t, "Error sending data out tunnel: no remote endpoint (tunnel not set up)\n");
- log_backtrace(backtrace_count, 5)
STAT(tunnel_tx_errors);
return;
}
{
tunnel[t].last = time_now; // control message sent
tunnel[t].retry = backoff(tunnel[t].try); // when to resend
- if (tunnel[t].try > 1)
+ if (tunnel[t].try)
{
STAT(tunnel_retries);
LOG(3, 0, t, "Control message resend try %d\n", tunnel[t].try);
return write(tunfd, data, size);
}
+// adjust tcp mss to avoid fragmentation (called only for tcp packets with syn set)
+void adjust_tcp_mss(sessionidt s, tunnelidt t, uint8_t *buf, int len, uint8_t *tcp)
+{
+ int d = (tcp[12] >> 4) * 4;
+ uint8_t *mss = 0;
+ uint8_t *opts;
+ uint8_t *data;
+ uint16_t orig;
+ uint32_t sum;
+
+ if ((tcp[13] & 0x3f) & ~(TCP_FLAG_SYN|TCP_FLAG_ACK)) // only want SYN and SYN,ACK
+ return;
+
+ if (tcp + d > buf + len) // short?
+ return;
+
+ opts = tcp + 20;
+ data = tcp + d;
+
+ while (opts < data)
+ {
+ if (*opts == 2 && opts[1] == 4) // mss option (2), length 4
+ {
+ mss = opts + 2;
+ if (mss + 2 > data) return; // short?
+ break;
+ }
+
+ if (*opts == 0) return; // end of options
+ if (*opts == 1 || !opts[1]) // no op (one byte), or no length (prevent loop)
+ opts++;
+ else
+ opts += opts[1]; // skip over option
+ }
+
+ if (!mss) return; // not found
+ orig = ntohs(*(uint16_t *) mss);
+
+ if (orig <= MSS) return; // mss OK
+
+ LOG(5, s, t, "TCP: %s:%u -> %s:%u SYN%s: adjusted mss from %u to %u\n",
+ fmtaddr(*(in_addr_t *) (buf + 12), 0), ntohs(*(uint16_t *) tcp),
+ fmtaddr(*(in_addr_t *) (buf + 16), 1), ntohs(*(uint16_t *) (tcp + 2)),
+ (tcp[13] & TCP_FLAG_ACK) ? ",ACK" : "", orig, MSS);
+
+ // set mss
+ *(int16_t *) mss = htons(MSS);
+
+ // adjust checksum (see rfc1141)
+ sum = orig + (~MSS & 0xffff);
+ sum += ntohs(*(uint16_t *) (tcp + 16));
+ sum = (sum & 0xffff) + (sum >> 16);
+ *(uint16_t *) (tcp + 16) = htons(sum + (sum >> 16));
+}
+
+void processmpframe(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l, uint8_t extra)
+{
+ uint16_t proto;
+ if (extra) {
+ // Skip the four extra bytes
+ p += 4;
+ l -= 4;
+ }
+
+ // Process this frame
+ if (*p & 1)
+ {
+ proto = *p++;
+ l--;
+ }
+ else
+ {
+ proto = ntohs(*(uint16_t *) p);
+ p += 2;
+ l -= 2;
+ }
+
+ if (proto == PPPIP)
+ {
+ if (session[s].die)
+ {
+ LOG(4, s, t, "MPPP: Session %u is closing. Don't process PPP packets\n", s);
+ return; // closing session, PPP not processed
+ }
+
+ session[s].last_packet = session[s].last_data = time_now;
+ processipin(s, t, p, l);
+ }
+ else if (proto == PPPIPV6 && config->ipv6_prefix.s6_addr[0])
+ {
+ if (session[s].die)
+ {
+ LOG(4, s, t, "MPPP: Session %u is closing. Don't process PPP packets\n", s);
+ return; // closing session, PPP not processed
+ }
+
+ session[s].last_packet = session[s].last_data = time_now;
+ processipv6in(s, t, p, l);
+ }
+ else
+ {
+ LOG(2, s, t, "MPPP: Unsupported MP protocol 0x%04X received\n",proto);
+ }
+}
+
// process outgoing (to tunnel) IP
//
static void processipout(uint8_t *buf, int len)
uint8_t *data = buf; // Keep a copy of the originals.
int size = len;
- uint8_t b[MAXETHER + 20];
+ uint8_t b1[MAXETHER + 20];
+ uint8_t b2[MAXETHER + 20];
CSTAT(processipout);
}
t = session[s].tunnel;
sp = &session[s];
+ sp->last_data = time_now;
// DoS prevention: enforce a maximum number of packets per 0.1s for a session
if (config->max_packets > 0)
if (session[s].filter_out && !ip_filter(buf, len, session[s].filter_out - 1))
return;
+ // adjust MSS on SYN and SYN,ACK packets with options
+ if ((ntohs(*(uint16_t *) (buf + 6)) & 0x1fff) == 0 && buf[9] == IPPROTO_TCP) // first tcp fragment
+ {
+ int ihl = (buf[0] & 0xf) * 4; // length of IP header
+ if (len >= ihl + 20 && (buf[ihl + 13] & TCP_FLAG_SYN) && ((buf[ihl + 12] >> 4) > 5))
+ adjust_tcp_mss(s, t, buf, len, buf + ihl);
+ }
+
if (sp->tbf_out)
{
// Are we throttling this session?
master_throttle_packet(sp->tbf_out, data, size);
return;
}
- else if (sp->walled_garden && !config->cluster_iam_master)
+
+ if (sp->walled_garden && !config->cluster_iam_master)
{
// We are walled-gardening this
master_garden_packet(s, data, size);
return;
}
- LOG(5, s, t, "Ethernet -> Tunnel (%d bytes)\n", len);
-
// Add on L2TP header
{
- uint8_t *p = makeppp(b, sizeof(b), buf, len, s, t, PPPIP);
- if (!p) return;
- tunnelsend(b, len + (p-b), t); // send it...
+ bundleidt bid = 0;
+ if (session[s].bundle && bundle[session[s].bundle].num_of_links > 1)
+ {
+ bid = session[s].bundle;
+ s = bundle[bid].members[bundle[bid].current_ses = ++bundle[bid].current_ses % bundle[bid].num_of_links];
+ LOG(4, s, t, "MPPP: (1)Session number becomes: %u\n", s);
+ if (len > 256)
+ {
+ // Partition the packet to 2 fragments
+ uint32_t frag1len = len / 2;
+ uint32_t frag2len = len - frag1len;
+ uint8_t *p = makeppp(b1, sizeof(b1), buf, frag1len, s, t, PPPIP, 0, bid, MP_BEGIN);
+ uint8_t *q;
+
+ if (!p) return;
+ tunnelsend(b1, frag1len + (p-b1), t); // send it...
+ s = bundle[bid].members[bundle[bid].current_ses = ++bundle[bid].current_ses % bundle[bid].num_of_links];
+ LOG(4, s, t, "MPPP: (2)Session number becomes: %u\n", s);
+ q = makeppp(b2, sizeof(b2), buf+frag1len, frag2len, s, t, PPPIP, 0, bid, MP_END);
+ if (!q) return;
+ tunnelsend(b2, frag2len + (q-b2), t); // send it...
+ }
+ else {
+ // Send it as one frame
+ uint8_t *p = makeppp(b1, sizeof(b1), buf, len, s, t, PPPIP, 0, bid, MP_BOTH_BITS);
+ if (!p) return;
+ tunnelsend(b1, len + (p-b1), t); // send it...
+ }
+ }
+ else
+ {
+ uint8_t *p = makeppp(b1, sizeof(b1), buf, len, s, t, PPPIP, 0, 0, 0);
+ if (!p) return;
+ tunnelsend(b1, len + (p-b1), t); // send it...
+ }
}
// Snooping this session, send it to intercept box
}
return;
}
+ if (session[s].bundle && bundle[session[s].bundle].num_of_links > 1)
+ {
+ bundleidt bid = session[s].bundle;
+ s = bundle[bid].members[bundle[bid].current_ses = ++bundle[bid].current_ses % bundle[bid].num_of_links];
+ LOG(3, s, session[s].tunnel, "MPPP: Session number becomes: %u\n", s);
+ }
t = session[s].tunnel;
sp = &session[s];
+ sp->last_data = time_now;
// FIXME: add DoS prevention/filters?
// Add on L2TP header
{
- uint8_t *p = makeppp(b, sizeof(b), buf, len, s, t, PPPIPV6);
+ uint8_t *p = makeppp(b, sizeof(b), buf, len, s, t, PPPIPV6, 0, 0, 0);
if (!p) return;
tunnelsend(b, len + (p-b), t); // send it...
}
// Add on L2TP header
{
- uint8_t *p = makeppp(b, sizeof(b), buf, len, s, t, PPPIP);
+ uint8_t *p = makeppp(b, sizeof(b), buf, len, s, t, PPPIP, 0, 0, 0);
if (!p) return;
tunnelsend(b, len + (p-b), t); // send it...
}
}
// start tidy shutdown of session
-void sessionshutdown(sessionidt s, char *reason, int result, int error)
+void sessionshutdown(sessionidt s, char const *reason, int cdn_result, int cdn_error, int term_cause)
{
int walled_garden = session[s].walled_garden;
if (!session[s].die)
{
struct param_kill_session data = { &tunnel[session[s].tunnel], &session[s] };
- LOG(2, s, session[s].tunnel, "Shutting down session %d: %s\n", s, reason);
+ LOG(2, s, session[s].tunnel, "Shutting down session %u: %s\n", s, reason);
run_plugins(PLUGIN_KILL_SESSION, &data);
}
{
// stop, if not already trying
if (radius[r].state != RADIUSSTOP)
+ {
+ radius[r].term_cause = term_cause;
+ radius[r].term_msg = reason;
radiussend(r, RADIUSSTOP);
+ }
}
else
LOG(1, s, session[s].tunnel, "No free RADIUS sessions for Stop message\n");
if (session[s].throttle_in || session[s].throttle_out) // Unthrottle if throttled.
throttle_session(s, 0, 0);
- if (result)
+ if (cdn_result)
{ // Send CDN
controlt *c = controlnew(14); // sending CDN
- if (error)
+ if (cdn_error)
{
uint8_t buf[4];
- *(uint16_t *) buf = htons(result);
- *(uint16_t *) (buf+2) = htons(error);
+ *(uint16_t *) buf = htons(cdn_result);
+ *(uint16_t *) (buf+2) = htons(cdn_error);
controlb(c, 1, buf, 4, 1);
}
else
- control16(c, 1, result, 1);
+ control16(c, 1, cdn_result, 1);
control16(c, 14, s, 1); // assigned session (our end)
controladd(c, session[s].far, session[s].tunnel); // send the message
void sendipcp(sessionidt s, tunnelidt t)
{
- uint8_t buf[MAXCONTROL];
+ uint8_t buf[MAXETHER];
uint8_t *q;
CSTAT(sendipcp);
+ LOG(3, s, t, "IPCP: send ConfigReq\n");
if (!session[s].unique_id)
{
session[s].unique_id = last_id;
}
- q = makeppp(buf,sizeof(buf), 0, 0, s, t, PPPIPCP);
+ q = makeppp(buf, sizeof(buf), 0, 0, s, t, PPPIPCP, 0, 0, 0);
if (!q) return;
*q = ConfigReq;
my_address; // send my IP
tunnelsend(buf, 10 + (q - buf), t); // send it
+ restart_timer(s, ipcp);
}
void sendipv6cp(sessionidt s, tunnelidt t)
{
- uint8_t buf[MAXCONTROL];
+ uint8_t buf[MAXETHER];
uint8_t *q;
CSTAT(sendipv6cp);
+ LOG(3, s, t, "IPV6CP: send ConfigReq\n");
- q = makeppp(buf,sizeof(buf), 0, 0, s, t, PPPIPV6CP);
+ q = makeppp(buf, sizeof(buf), 0, 0, s, t, PPPIPV6CP, 0, 0, 0);
if (!q) return;
*q = ConfigReq;
q[13] = 1;
tunnelsend(buf, 14 + (q - buf), t); // send it
+ restart_timer(s, ipv6cp);
}
static void sessionclear(sessionidt s)
// kill a session now
void sessionkill(sessionidt s, char *reason)
{
+ bundleidt b;
CSTAT(sessionkill);
if (session[s].next)
{
- LOG(0, s, session[s].tunnel, "Tried to kill a session with next pointer set (%d)\n", session[s].next);
+ LOG(0, s, session[s].tunnel, "Tried to kill a session with next pointer set (%u)\n", session[s].next);
return;
}
session[s].die = TIME;
- sessionshutdown(s, reason, 3, 0); // close radius/routes, etc.
+ sessionshutdown(s, reason, CDN_ADMIN_DISC, TERM_ADMIN_RESET); // close radius/routes, etc.
if (sess_local[s].radius)
radiusclear(sess_local[s].radius, s); // cant send clean accounting data, session is killed
- LOG(2, s, session[s].tunnel, "Kill session %d (%s): %s\n", s, session[s].user, reason);
+ LOG(2, s, session[s].tunnel, "Kill session %u (%s): %s\n", s, session[s].user, reason);
+ if ((b = session[s].bundle))
+ {
+ // This session was part of a bundle
+ bundle[b].num_of_links--;
+ LOG(3, s, 0, "MPPP: Dropping member link: %u from bundle %u\n", s, b);
+ if (bundle[b].num_of_links == 0)
+ {
+ bundleclear(b);
+ LOG(3, s, 0, "MPPP: Kill bundle: %u (No remaing member links)\n", b);
+ }
+ else
+ {
+ // Adjust the members array to accomodate the new change
+ uint8_t mem_num = 0;
+ // It should be here num_of_links instead of num_of_links-1 (previous instruction "num_of_links--")
+ if (bundle[b].members[bundle[b].num_of_links] != s)
+ {
+ uint8_t ml;
+ for (ml = 0; ml<bundle[b].num_of_links; ml++)
+ {
+ if (bundle[b].members[ml] == s)
+ {
+ mem_num = ml;
+ break;
+ }
+ }
+ bundle[b].members[mem_num] = bundle[b].members[bundle[b].num_of_links];
+ LOG(3, s, 0, "MPPP: Adjusted member links array\n");
+ }
+ }
+ cluster_send_bundle(b);
+ }
sessionclear(s);
cluster_send_session(s);
}
tunnel[t].state = TUNNELFREE;
}
+static void bundleclear(bundleidt b)
+{
+ if (!b) return;
+ memset(&bundle[b], 0, sizeof(bundle[b]));
+ bundle[b].state = BUNDLEFREE;
+}
+
// kill a tunnel now
static void tunnelkill(tunnelidt t, char *reason)
{
// free tunnel
tunnelclear(t);
- LOG(1, 0, t, "Kill tunnel %d: %s\n", t, reason);
+ LOG(1, 0, t, "Kill tunnel %u: %s\n", t, reason);
cli_tunnel_actions[t].action = 0;
cluster_send_tunnel(t);
}
tunnelkill(t, reason);
return;
}
- LOG(1, 0, t, "Shutting down tunnel %d (%s)\n", t, reason);
+ LOG(1, 0, t, "Shutting down tunnel %u (%s)\n", t, reason);
// close session
for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
if (session[s].tunnel == t)
- sessionshutdown(s, reason, 0, 0);
+ sessionshutdown(s, reason, CDN_NONE, TERM_ADMIN_RESET);
tunnel[t].state = TUNNELDIE;
tunnel[t].die = TIME + 700; // Clean up in 70 seconds
}
if ((buf[1] & 0x0F) != 2)
{
- LOG(1, 0, 0, "Bad L2TP ver %d\n", (buf[1] & 0x0F) != 2);
+ LOG(1, 0, 0, "Bad L2TP ver %d\n", buf[1] & 0x0F);
STAT(tunnel_rx_errors);
return;
}
return;
}
l -= (p - buf);
+
+ // used to time out old tunnels
+ if (t && tunnel[t].state == TUNNELOPEN)
+ tunnel[t].lastrec = time_now;
+
if (*buf & 0x80)
{ // control
uint16_t message = 0xFFFF; // message type
}
}
- LOG(3, s, t, "Control message (%d bytes): (unacked %d) l-ns %d l-nr %d r-ns %d r-nr %d\n",
+ LOG(3, s, t, "Control message (%d bytes): (unacked %d) l-ns %u l-nr %u r-ns %u r-nr %u\n",
l, tunnel[t].controlc, tunnel[t].ns, tunnel[t].nr, ns, nr);
// if no tunnel specified, assign one
tunnel[t].port = ntohs(addr->sin_port);
tunnel[t].window = 4; // default window
STAT(tunnel_created);
- LOG(1, 0, t, " New tunnel from %s:%u ID %d\n",
+ LOG(1, 0, t, " New tunnel from %s:%u ID %u\n",
fmtaddr(htonl(tunnel[t].ip), 0), tunnel[t].port, t);
}
{
// is this the sequence we were expecting?
STAT(tunnel_rx_errors);
- LOG(1, 0, t, " Out of sequence tunnel %d, (%d is not the expected %d)\n",
+ LOG(1, 0, t, " Out of sequence tunnel %u, (%u is not the expected %u)\n",
t, ns, tunnel[t].nr);
if (l) // Is this not a ZLB?
return;
}
- // This is used to time out old tunnels
- tunnel[t].lastrec = time_now;
-
// check sequence of this message
{
int skip = tunnel[t].window; // track how many in-window packets are still in queue
int error = 0;
char *msg = 0;
+ // Default disconnect cause/message on receipt of CDN. Set to
+ // more specific value from attribute 1 (result code) or 46
+ // (disconnect cause) if present below.
+ int disc_cause_set = 0;
+ int disc_cause = TERM_NAS_REQUEST;
+ char const *disc_reason = "Closed (Received CDN).";
+
// process AVPs
while (l && !(fatal & 0x80)) // 0x80 = mandatory AVP
{
uint8_t *b = p;
uint8_t flags = *p;
uint16_t mtype;
+
if (n > l)
{
LOG(1, s, t, "Invalid length in AVP\n");
b += 2;
if (*(uint16_t *) (b))
{
- LOG(2, s, t, "Unknown AVP vendor %d\n", ntohs(*(uint16_t *) (b)));
+ LOG(2, s, t, "Unknown AVP vendor %u\n", ntohs(*(uint16_t *) (b)));
fatal = flags;
result = 2; // general error
error = 6; // generic vendor-specific error
uint16_t orig_len;
// handle hidden AVPs
- if (!*config->l2tpsecret)
+ if (!*config->l2tp_secret)
{
LOG(1, s, t, "Hidden AVP requested, but no L2TP secret.\n");
fatal = flags;
n = orig_len;
}
- LOG(4, s, t, " AVP %d (%s) len %d%s%s\n", mtype, l2tp_avp_name(mtype), n,
+ LOG(4, s, t, " AVP %u (%s) len %d%s%s\n", mtype, l2tp_avp_name(mtype), n,
flags & 0x40 ? ", hidden" : "", flags & 0x80 ? ", mandatory" : "");
switch (mtype)
case 0: // message type
message = ntohs(*(uint16_t *) b);
mandatory = flags & 0x80;
- LOG(4, s, t, " Message type = %d (%s)\n", *b, l2tp_code(message));
+ LOG(4, s, t, " Message type = %u (%s)\n", *b, l2tp_code(message));
break;
case 1: // result code
{
uint16_t rescode = ntohs(*(uint16_t *) b);
- const char* resdesc = "(unknown)";
+ char const *resdesc = "(unknown)";
+ char const *errdesc = NULL;
+ int cause = 0;
+
if (message == 4)
{ /* StopCCN */
resdesc = l2tp_stopccn_result_code(rescode);
+ cause = TERM_LOST_SERVICE;
}
else if (message == 14)
{ /* CDN */
resdesc = l2tp_cdn_result_code(rescode);
+ if (rescode == 1)
+ cause = TERM_LOST_CARRIER;
+ else
+ cause = TERM_ADMIN_RESET;
}
- LOG(4, s, t, " Result Code %d: %s\n", rescode, resdesc);
+ LOG(4, s, t, " Result Code %u: %s\n", rescode, resdesc);
if (n >= 4)
{
uint16_t errcode = ntohs(*(uint16_t *)(b + 2));
- LOG(4, s, t, " Error Code %d: %s\n", errcode, l2tp_error_code(errcode));
+ errdesc = l2tp_error_code(errcode);
+ LOG(4, s, t, " Error Code %u: %s\n", errcode, errdesc);
}
if (n > 4)
LOG(4, s, t, " Error String: %.*s\n", n-4, b+4);
+ if (cause && disc_cause_set < mtype) // take cause from attrib 46 in preference
+ {
+ disc_cause_set = mtype;
+ disc_reason = errdesc ? errdesc : resdesc;
+ disc_cause = cause;
+ }
+
break;
}
break;
case 2: // protocol version
{
version = ntohs(*(uint16_t *) (b));
- LOG(4, s, t, " Protocol version = %d\n", version);
+ LOG(4, s, t, " Protocol version = %u\n", version);
if (version && version != 0x0100)
{ // allow 0.0 and 1.0
LOG(1, s, t, " Bad protocol version %04X\n", version);
}
break;
case 3: // framing capabilities
-// LOG(4, s, t, "Framing capabilities\n");
break;
case 4: // bearer capabilities
-// LOG(4, s, t, "Bearer capabilities\n");
break;
case 5: // tie breaker
// We never open tunnels, so we don't care about tie breakers
-// LOG(4, s, t, "Tie breaker\n");
continue;
case 6: // firmware revision
-// LOG(4, s, t, "Firmware revision\n");
break;
case 7: // host name
memset(tunnel[t].hostname, 0, sizeof(tunnel[t].hostname));
break;
case 9: // assigned tunnel
tunnel[t].far = ntohs(*(uint16_t *) (b));
- LOG(4, s, t, " Remote tunnel id = %d\n", tunnel[t].far);
+ LOG(4, s, t, " Remote tunnel id = %u\n", tunnel[t].far);
break;
case 10: // rx window
tunnel[t].window = ntohs(*(uint16_t *) (b));
if (!tunnel[t].window)
tunnel[t].window = 1; // window of 0 is silly
- LOG(4, s, t, " rx window = %d\n", tunnel[t].window);
+ LOG(4, s, t, " rx window = %u\n", tunnel[t].window);
break;
case 11: // Challenge
{
case 14: // assigned session
asession = session[s].far = ntohs(*(uint16_t *) (b));
- LOG(4, s, t, " assigned session = %d\n", asession);
+ LOG(4, s, t, " assigned session = %u\n", asession);
break;
case 15: // call serial number
- LOG(4, s, t, " call serial number = %d\n", ntohl(*(uint32_t *)b));
+ LOG(4, s, t, " call serial number = %u\n", ntohl(*(uint32_t *)b));
break;
case 18: // bearer type
- LOG(4, s, t, " bearer type = %d\n", ntohl(*(uint32_t *)b));
+ LOG(4, s, t, " bearer type = %u\n", ntohl(*(uint32_t *)b));
// TBA - for RADIUS
break;
case 19: // framing type
- LOG(4, s, t, " framing type = %d\n", ntohl(*(uint32_t *)b));
+ LOG(4, s, t, " framing type = %u\n", ntohl(*(uint32_t *)b));
// TBA
break;
case 21: // called number
case 29: // Proxy Authentication Type
{
uint16_t atype = ntohs(*(uint16_t *)b);
- LOG(4, s, t, " Proxy Auth Type %d (%s)\n", atype, ppp_auth_type(atype));
+ LOG(4, s, t, " Proxy Auth Type %u (%s)\n", atype, ppp_auth_type(atype));
break;
}
case 30: // Proxy Authentication Name
case 32: // Proxy Authentication ID
{
uint16_t authid = ntohs(*(uint16_t *)(b));
- LOG(4, s, t, " Proxy Auth ID (%d)\n", authid);
+ LOG(4, s, t, " Proxy Auth ID (%u)\n", authid);
break;
}
case 33: // Proxy Authentication Response
if (*p == 5 && p[1] == 6) // Magic-Number
amagic = ntohl(*(uint32_t *) (p + 2));
else if (*p == 7) // Protocol-Field-Compression
- aflags |= SESSIONPFC;
+ aflags |= SESSION_PFC;
else if (*p == 8) // Address-and-Control-Field-Compression
- aflags |= SESSIONACFC;
+ aflags |= SESSION_ACFC;
p += p[1];
}
}
memcpy(session[s].random_vector, b, n);
session[s].random_vector_length = n;
break;
+ case 46: // ppp disconnect cause
+ if (n >= 5)
+ {
+ uint16_t code = ntohs(*(uint16_t *) b);
+ uint16_t proto = ntohs(*(uint16_t *) (b + 2));
+ uint8_t dir = *(b + 4);
+
+ LOG(4, s, t, " PPP disconnect cause "
+ "(code=%u, proto=%04X, dir=%u, msg=\"%.*s\")\n",
+ code, proto, dir, n - 5, b + 5);
+
+ disc_cause_set = mtype;
+
+ switch (code)
+ {
+ case 1: // admin disconnect
+ disc_cause = TERM_ADMIN_RESET;
+ disc_reason = "Administrative disconnect";
+ break;
+ case 3: // lcp terminate
+ if (dir != 2) break; // 1=peer (LNS), 2=local (LAC)
+ disc_cause = TERM_USER_REQUEST;
+ disc_reason = "Normal disconnection";
+ break;
+ case 4: // compulsory encryption unavailable
+ if (dir != 1) break; // 1=refused by peer, 2=local
+ disc_cause = TERM_USER_ERROR;
+ disc_reason = "Compulsory encryption refused";
+ break;
+ case 5: // lcp: fsm timeout
+ disc_cause = TERM_PORT_ERROR;
+ disc_reason = "LCP: FSM timeout";
+ break;
+ case 6: // lcp: no recognisable lcp packets received
+ disc_cause = TERM_PORT_ERROR;
+ disc_reason = "LCP: no recognisable LCP packets";
+ break;
+ case 7: // lcp: magic-no error (possibly looped back)
+ disc_cause = TERM_PORT_ERROR;
+ disc_reason = "LCP: magic-no error (possible loop)";
+ break;
+ case 8: // lcp: echo request timeout
+ disc_cause = TERM_PORT_ERROR;
+ disc_reason = "LCP: echo request timeout";
+ break;
+ case 13: // auth: fsm timeout
+ disc_cause = TERM_SERVICE_UNAVAILABLE;
+ disc_reason = "Authentication: FSM timeout";
+ break;
+ case 15: // auth: unacceptable auth protocol
+ disc_cause = TERM_SERVICE_UNAVAILABLE;
+ disc_reason = "Unacceptable authentication protocol";
+ break;
+ case 16: // auth: authentication failed
+ disc_cause = TERM_SERVICE_UNAVAILABLE;
+ disc_reason = "Authentication failed";
+ break;
+ case 17: // ncp: fsm timeout
+ disc_cause = TERM_SERVICE_UNAVAILABLE;
+ disc_reason = "NCP: FSM timeout";
+ break;
+ case 18: // ncp: no ncps available
+ disc_cause = TERM_SERVICE_UNAVAILABLE;
+ disc_reason = "NCP: no NCPs available";
+ break;
+ case 19: // ncp: failure to converge on acceptable address
+ disc_cause = TERM_SERVICE_UNAVAILABLE;
+ disc_reason = (dir == 1)
+ ? "NCP: too many Configure-Naks received from peer"
+ : "NCP: too many Configure-Naks sent to peer";
+ break;
+ case 20: // ncp: user not permitted to use any address
+ disc_cause = TERM_SERVICE_UNAVAILABLE;
+ disc_reason = (dir == 1)
+ ? "NCP: local link address not acceptable to peer"
+ : "NCP: remote link address not acceptable";
+ break;
+ }
+ }
+ break;
default:
{
static char e[] = "unknown AVP 0xXXXX";
- LOG(2, s, t, " Unknown AVP type %d\n", mtype);
+ LOG(2, s, t, " Unknown AVP type %u\n", mtype);
fatal = flags;
result = 2; // general error
error = 8; // unknown mandatory AVP
controlt *c = controlnew(2); // sending SCCRP
control16(c, 2, version, 1); // protocol version
control32(c, 3, 3, 1); // framing
- controls(c, 7, tunnel[t].hostname, 1); // host name (TBA)
+ controls(c, 7, hostname, 1); // host name
if (chapresponse) controlb(c, 13, chapresponse, 16, 1); // Challenge response
control16(c, 9, t, 1); // assigned tunnel
controladd(c, 0, t); // send the resply
session[s].opened = time_now;
session[s].tunnel = t;
session[s].far = asession;
- session[s].last_packet = time_now;
- LOG(3, s, t, "New session (%d/%d)\n", tunnel[t].far, session[s].far);
+ session[s].last_packet = session[s].last_data = time_now;
+ LOG(3, s, t, "New session (%u/%u)\n", tunnel[t].far, session[s].far);
control16(c, 14, s, 1); // assigned session
controladd(c, asession, t); // send the reply
case 12: // ICCN
if (amagic == 0) amagic = time_now;
session[s].magic = amagic; // set magic number
- session[s].l2tp_flags = aflags; // set flags received
+ session[s].flags = aflags; // set flags received
+ session[s].mru = PPPoE_MRU; // default
controlnull(t); // ack
// start LCP
- sendlcp(s, t, config->radius_authprefer);
- sess_local[s].lcp.restart = time_now + config->ppp_restart_time;
- sess_local[s].lcp.conf_sent = 1;
- sess_local[s].lcp.nak_sent = 0;
sess_local[s].lcp_authtype = config->radius_authprefer;
- session[s].ppp.lcp = RequestSent;
+ sess_local[s].ppp_mru = MRU;
+
+ // Set multilink options before sending initial LCP packet
+ sess_local[s].mp_mrru = 1614;
+ sess_local[s].mp_epdis = config->bind_address ? config->bind_address : my_address;
+ sendlcp(s, t);
+ change_state(s, lcp, RequestSent);
break;
+
case 14: // CDN
controlnull(t); // ack
- sessionshutdown(s, "Closed (Received CDN).", 0, 0);
+ sessionshutdown(s, disc_reason, CDN_NONE, disc_cause);
break;
case 0xFFFF:
LOG(1, s, t, "Missing message type\n");
if (mandatory)
tunnelshutdown(t, "Unknown message type", 2, 6, "unknown message type");
else
- LOG(1, s, t, "Unknown message type %d\n", message);
+ LOG(1, s, t, "Unknown message type %u\n", message);
break;
}
if (chapresponse) free(chapresponse);
}
else
{ // data
- uint16_t prot;
+ uint16_t proto;
LOG_HEX(5, "Receive Tunnel Data", p, l);
if (l > 2 && p[0] == 0xFF && p[1] == 0x03)
}
if (*p & 1)
{
- prot = *p++;
+ proto = *p++;
l--;
}
else
{
- prot = ntohs(*(uint16_t *) p);
+ proto = ntohs(*(uint16_t *) p);
p += 2;
l -= 2;
}
return;
}
- if (prot == PPPPAP)
+ if (proto == PPPPAP)
{
session[s].last_packet = time_now;
if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
processpap(s, t, p, l);
}
- else if (prot == PPPCHAP)
+ else if (proto == PPPCHAP)
{
session[s].last_packet = time_now;
if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
processchap(s, t, p, l);
}
- else if (prot == PPPLCP)
+ else if (proto == PPPLCP)
{
session[s].last_packet = time_now;
if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
processlcp(s, t, p, l);
}
- else if (prot == PPPIPCP)
+ else if (proto == PPPIPCP)
{
session[s].last_packet = time_now;
if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
processipcp(s, t, p, l);
}
- else if (prot == PPPIPV6CP)
+ else if (proto == PPPIPV6CP && config->ipv6_prefix.s6_addr[0])
{
session[s].last_packet = time_now;
if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
processipv6cp(s, t, p, l);
}
- else if (prot == PPPCCP)
+ else if (proto == PPPCCP)
{
session[s].last_packet = time_now;
if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
processccp(s, t, p, l);
}
- else if (prot == PPPIP)
+ else if (proto == PPPIP)
{
if (session[s].die)
{
- LOG(4, s, t, "Session %d is closing. Don't process PPP packets\n", s);
+ LOG(4, s, t, "Session %u is closing. Don't process PPP packets\n", s);
return; // closing session, PPP not processed
}
- session[s].last_packet = time_now;
+ session[s].last_packet = session[s].last_data = time_now;
if (session[s].walled_garden && !config->cluster_iam_master)
{
master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port);
processipin(s, t, p, l);
}
- else if (prot == PPPIPV6)
+ else if (proto == PPPMP)
{
- if (!config->ipv6_prefix.s6_addr[0])
+ if (session[s].die)
{
- LOG(1, s, t, "IPv6 not configured; yet received IPv6 packet. Ignoring.\n");
+ LOG(4, s, t, "Session %u is closing. Don't process PPP packets\n", s);
+ return; // closing session, PPP not processed
+ }
+
+ session[s].last_packet = session[s].last_data = time_now;
+ if (session[s].walled_garden && !config->cluster_iam_master)
+ {
+ master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port);
return;
}
+
+ processmpin(s, t, p, l);
+ }
+ else if (proto == PPPIPV6 && config->ipv6_prefix.s6_addr[0])
+ {
if (session[s].die)
{
- LOG(4, s, t, "Session %d is closing. Don't process PPP packets\n", s);
+ LOG(4, s, t, "Session %u is closing. Don't process PPP packets\n", s);
return; // closing session, PPP not processed
}
- session[s].last_packet = time_now;
+ session[s].last_packet = session[s].last_data = time_now;
if (session[s].walled_garden && !config->cluster_iam_master)
{
master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port);
processipv6in(s, t, p, l);
}
+ else if (session[s].ppp.lcp == Opened)
+ {
+ session[s].last_packet = time_now;
+ if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
+ protoreject(s, t, p, l, proto);
+ }
else
{
- STAT(tunnel_rx_errors);
- LOG(1, s, t, "Unknown PPP protocol %04X\n", prot);
+ LOG(2, s, t, "Unknown PPP protocol 0x%04X received in LCP %s state\n",
+ proto, ppp_state(session[s].ppp.lcp));
}
}
}
}
}
// Send hello
- if (tunnel[t].state == TUNNELOPEN && tunnel[t].lastrec < TIME + 600)
+ if (tunnel[t].state == TUNNELOPEN && !tunnel[t].controlc && (time_now - tunnel[t].lastrec) > 60)
{
controlt *c = controlnew(6); // sending HELLO
controladd(c, 0, t); // send the message
continue;
}
+ // check for timed out sessions
+ if (session[s].timeout)
+ {
+ bundleidt bid = session[s].bundle;
+ if (bid)
+ {
+ clockt curr_time = time_now;
+ if (curr_time - bundle[bid].last_check >= 1)
+ {
+ bundle[bid].online_time += (curr_time-bundle[bid].last_check)*bundle[bid].num_of_links;
+ bundle[bid].last_check = curr_time;
+ if (bundle[bid].online_time >= session[s].timeout)
+ {
+ int ses;
+ for (ses = bundle[bid].num_of_links - 1; ses >= 0; ses--)
+ {
+ sessionshutdown(bundle[bid].members[ses], "Session timeout", CDN_ADMIN_DISC, TERM_SESSION_TIMEOUT);
+ s_actions++;
+ continue;
+ }
+ }
+ }
+ }
+ else if (session[s].timeout <= time_now - session[s].opened)
+ {
+ sessionshutdown(s, "Session timeout", CDN_ADMIN_DISC, TERM_SESSION_TIMEOUT);
+ s_actions++;
+ continue;
+ }
+ }
+
// PPP timeouts
if (sess_local[s].lcp.restart <= time_now)
{
if (sess_local[s].lcp.conf_sent < config->ppp_max_configure)
{
LOG(3, s, session[s].tunnel, "No ACK for LCP ConfigReq... resending\n");
- sess_local[s].lcp.restart = time_now + config->ppp_restart_time;
- sess_local[s].lcp.conf_sent++;
- sendlcp(s, t, sess_local[s].lcp_authtype);
+ sendlcp(s, session[s].tunnel);
change_state(s, lcp, next_state);
}
else
{
- sessionshutdown(s, "No response to LCP ConfigReq.", 3, 0);
+ sessionshutdown(s, "No response to LCP ConfigReq.", CDN_ADMIN_DISC, TERM_LOST_SERVICE);
STAT(session_timeout);
}
if (sess_local[s].ipcp.conf_sent < config->ppp_max_configure)
{
LOG(3, s, session[s].tunnel, "No ACK for IPCP ConfigReq... resending\n");
- sess_local[s].ipcp.restart = time_now + config->ppp_restart_time;
- sess_local[s].ipcp.conf_sent++;
- sendipcp(s, t);
+ sendipcp(s, session[s].tunnel);
change_state(s, ipcp, next_state);
}
else
{
- sessionshutdown(s, "No response to IPCP ConfigReq.", 3, 0);
+ sessionshutdown(s, "No response to IPCP ConfigReq.", CDN_ADMIN_DISC, TERM_LOST_SERVICE);
STAT(session_timeout);
}
if (sess_local[s].ipv6cp.conf_sent < config->ppp_max_configure)
{
LOG(3, s, session[s].tunnel, "No ACK for IPV6CP ConfigReq... resending\n");
- sess_local[s].ipv6cp.restart = time_now + config->ppp_restart_time;
- sess_local[s].ipv6cp.conf_sent++;
- sendipv6cp(s, t);
+ sendipv6cp(s, session[s].tunnel);
change_state(s, ipv6cp, next_state);
}
else
if (sess_local[s].ccp.conf_sent < config->ppp_max_configure)
{
LOG(3, s, session[s].tunnel, "No ACK for CCP ConfigReq... resending\n");
- sess_local[s].ccp.restart = time_now + config->ppp_restart_time;
- sess_local[s].ccp.conf_sent++;
- sendccp(s, t);
+ sendccp(s, session[s].tunnel);
change_state(s, ccp, next_state);
}
else
// Drop sessions who have not responded within IDLE_TIMEOUT seconds
if (session[s].last_packet && (time_now - session[s].last_packet >= IDLE_TIMEOUT))
{
- sessionshutdown(s, "No response to LCP ECHO requests.", 3, 0);
+ sessionshutdown(s, "No response to LCP ECHO requests.", CDN_ADMIN_DISC, TERM_LOST_SERVICE);
STAT(session_timeout);
s_actions++;
continue;
}
// No data in ECHO_TIMEOUT seconds, send LCP ECHO
- if (session[s].ppp.phase >= Establish && (time_now - session[s].last_packet >= ECHO_TIMEOUT))
+ if (session[s].ppp.phase >= Establish && (time_now - session[s].last_packet >= ECHO_TIMEOUT) &&
+ (time_now - sess_local[s].last_echo >= ECHO_TIMEOUT))
{
- uint8_t b[MAXCONTROL] = {0};
+ uint8_t b[MAXETHER];
- uint8_t *q = makeppp(b, sizeof(b), 0, 0, s, session[s].tunnel, PPPLCP);
+ uint8_t *q = makeppp(b, sizeof(b), 0, 0, s, session[s].tunnel, PPPLCP, 1, 0, 0);
if (!q) continue;
*q = EchoReq;
*(uint8_t *)(q + 1) = (time_now % 255); // ID
*(uint16_t *)(q + 2) = htons(8); // Length
- *(uint32_t *)(q + 4) = 0; // Magic Number (not supported)
+ *(uint32_t *)(q + 4) = session[s].ppp.lcp == Opened ? htonl(session[s].magic) : 0; // Magic Number
LOG(4, s, session[s].tunnel, "No data in %d seconds, sending LCP ECHO\n",
(int)(time_now - session[s].last_packet));
tunnelsend(b, 24, session[s].tunnel); // send it
+ sess_local[s].last_echo = time_now;
+ s_actions++;
+ }
+
+ // Drop sessions who have reached session_timeout seconds
+ if (session[s].session_timeout && (time_now - session[s].opened >= session[s].session_timeout))
+ {
+ sessionshutdown(s, "Session Timeout Reached", CDN_ADMIN_DISC, TERM_SESSION_TIMEOUT);
+ STAT(session_timeout);
+ s_actions++;
+ continue;
+ }
+
+ // Drop sessions who have reached idle_timeout seconds
+ if (session[s].last_data && session[s].idle_timeout && (time_now - session[s].last_data >= session[s].idle_timeout))
+ {
+ sessionshutdown(s, "Idle Timeout Reached", CDN_ADMIN_DISC, TERM_IDLE_TIMEOUT);
+ STAT(session_timeout);
s_actions++;
+ continue;
}
// Check for actions requested from the CLI
if (a & CLI_SESS_KILL)
{
LOG(2, s, session[s].tunnel, "Dropping session by CLI\n");
- sessionshutdown(s, "Requested by administrator.", 3, 0);
+ sessionshutdown(s, "Requested by administrator.", CDN_ADMIN_DISC, TERM_ADMIN_RESET);
a = 0; // dead, no need to check for other actions
s_actions++;
}
}
else if (a & CLI_SESS_SNOOP)
{
- LOG(2, s, session[s].tunnel, "Snooping session by CLI (to %s:%d)\n",
+ LOG(2, s, session[s].tunnel, "Snooping session by CLI (to %s:%u)\n",
fmtaddr(cli_session_actions[s].snoop_ip, 0),
cli_session_actions[s].snoop_port);
if (last_talked != TIME)
{
- LOG(2, 0, 0, "Tunnel %d still has un-acked control messages.\n", i);
+ LOG(2, 0, 0, "Tunnel %u still has un-acked control messages.\n", i);
last_talked = TIME;
}
return 1;
if (last_talked != TIME)
{
- LOG(2, 0, 0, "Radius session %d is still busy (sid %d)\n", i, radius[i].session);
+ LOG(2, 0, 0, "Radius session %u is still busy (sid %u)\n", i, radius[i].session);
last_talked = TIME;
}
return 1;
e.events = EPOLLIN;
i = 0;
- d[i].type = FD_TYPE_CLI;
- e.data.ptr = &d[i++];
- epoll_ctl(epollfd, EPOLL_CTL_ADD, clifd, &e);
+ if (clifd >= 0)
+ {
+ d[i].type = FD_TYPE_CLI;
+ e.data.ptr = &d[i++];
+ epoll_ctl(epollfd, EPOLL_CTL_ADD, clifd, &e);
+ }
d[i].type = FD_TYPE_CLUSTER;
e.data.ptr = &d[i++];
int more = 0;
int n;
+
+ if (main_reload)
+ {
+ main_reload = 0;
+ read_config_file();
+ config->reload_config++;
+ }
+
if (config->reload_config)
{
- // Update the config state based on config settings
+ config->reload_config = 0;
update_config();
}
if (n)
{
struct sockaddr_in addr;
+ struct in_addr local;
socklen_t alen;
int c, s;
int udp_ready = 0;
for (c = n, i = 0; i < c; i++)
{
struct event_data *d = events[i].data.ptr;
+
switch (d->type)
{
case FD_TYPE_CLI: // CLI connections
case FD_TYPE_CONTROL: // nsctl commands
alen = sizeof(addr);
- processcontrol(buf, recvfrom(controlfd, buf, sizeof(buf), MSG_WAITALL, (void *) &addr, &alen), &addr, alen);
+ s = recvfromto(controlfd, buf, sizeof(buf), MSG_WAITALL, (struct sockaddr *) &addr, &alen, &local);
+ if (s > 0) processcontrol(buf, s, &addr, alen, &local);
n--;
break;
case FD_TYPE_DAE: // DAE requests
alen = sizeof(addr);
- processdae(buf, recvfrom(daefd, buf, sizeof(buf), MSG_WAITALL, (void *) &addr, &alen), &addr, alen);
+ s = recvfromto(daefd, buf, sizeof(buf), MSG_WAITALL, (struct sockaddr *) &addr, &alen, &local);
+ if (s > 0) processdae(buf, s, &addr, alen, &local);
n--;
break;
case FD_TYPE_RADIUS: // RADIUS response
- s = recv(radfds[d->index], buf, sizeof(buf), 0);
+ alen = sizeof(addr);
+ s = recvfrom(radfds[d->index], buf, sizeof(buf), MSG_WAITALL, (struct sockaddr *) &addr, &alen);
if (s >= 0 && config->cluster_iam_master)
- processrad(buf, s, d->index);
+ {
+ if (addr.sin_addr.s_addr == config->radiusserver[0] ||
+ addr.sin_addr.s_addr == config->radiusserver[1])
+ processrad(buf, s, d->index);
+ else
+ LOG(3, 0, 0, "Dropping RADIUS packet from unknown source %s\n",
+ fmtaddr(addr.sin_addr.s_addr, 0));
+ }
n--;
break;
}
}
+ if (time_changed)
+ {
+ double Mbps = 1024.0 * 1024.0 / 8 * time_changed;
+
+ // Log current traffic stats
+ snprintf(config->bandwidth, sizeof(config->bandwidth),
+ "UDP-ETH:%1.0f/%1.0f ETH-UDP:%1.0f/%1.0f TOTAL:%0.1f IN:%u OUT:%u",
+ (udp_rx / Mbps), (eth_tx / Mbps), (eth_rx / Mbps), (udp_tx / Mbps),
+ ((udp_tx + udp_rx + eth_tx + eth_rx) / Mbps),
+ udp_rx_pkt / time_changed, eth_rx_pkt / time_changed);
+
+ udp_tx = udp_rx = 0;
+ udp_rx_pkt = eth_rx_pkt = 0;
+ eth_tx = eth_rx = 0;
+ time_changed = 0;
+
+ if (config->dump_speed)
+ printf("%s\n", config->bandwidth);
+
+ // Update the internal time counter
+ strftime(time_now_string, sizeof(time_now_string), "%Y-%m-%d %H:%M:%S", localtime(&time_now));
+
+ {
+ // Run timer hooks
+ struct param_timer p = { time_now };
+ run_plugins(PLUGIN_TIMER, &p);
+ }
+ }
+
// Runs on every machine (master and slaves).
if (next_cluster_ping <= TIME)
{
config->debug = optdebug;
config->num_tbfs = MAXTBFS;
config->rl_rate = 28; // 28kbps
+ config->cluster_mcast_ttl = 1;
config->cluster_master_min_adv = 1;
config->ppp_restart_time = 3;
config->ppp_max_configure = 10;
LOG(0, 0, 0, "Error doing malloc for tunnels: %s\n", strerror(errno));
exit(1);
}
+ if (!(bundle = shared_malloc(sizeof(bundlet) * MAXBUNDLE)))
+ {
+ LOG(0, 0, 0, "Error doing malloc for bundles: %s\n", strerror(errno));
+ exit(1);
+ }
+ if (!(frag = shared_malloc(sizeof(fragmentationt) * MAXBUNDLE)))
+ {
+ LOG(0, 0, 0, "Error doing malloc for fragmentations: %s\n", strerror(errno));
+ exit(1);
+ }
if (!(session = shared_malloc(sizeof(sessiont) * MAXSESSION)))
{
LOG(0, 0, 0, "Error doing malloc for sessions: %s\n", strerror(errno));
memset(cli_tunnel_actions, 0, sizeof(struct cli_tunnel_actions) * MAXSESSION);
memset(tunnel, 0, sizeof(tunnelt) * MAXTUNNEL);
+ memset(bundle, 0, sizeof(bundlet) * MAXBUNDLE);
memset(session, 0, sizeof(sessiont) * MAXSESSION);
memset(radius, 0, sizeof(radiust) * MAXRADIUS);
memset(ip_address_pool, 0, sizeof(ippoolt) * MAXIPPOOL);
for (i = 1; i < MAXTUNNEL; i++)
tunnel[i].state = TUNNELUNDEF; // mark it as not filled in.
+ for (i = 1; i < MAXBUNDLE; i++) {
+ bundle[i].state = BUNDLEUNDEF;
+ }
+
if (!*hostname)
{
// Grab my hostname unless it's been specified
if (ipid < 1) // Not found in the pool either? good.
continue;
- LOG(0, i, 0, "Session %d has an IP address (%s) that was marked static, but is in the pool (%d)!\n",
+ LOG(0, i, 0, "Session %u has an IP address (%s) that was marked static, but is in the pool (%d)!\n",
i, fmtaddr(session[i].ip, 0), ipid);
// Fall through and process it as part of the pool.
if (ipid > MAXIPPOOL || ipid < 0)
{
- LOG(0, i, 0, "Session %d has a pool IP that's not found in the pool! (%d)\n", i, ipid);
+ LOG(0, i, 0, "Session %u has a pool IP that's not found in the pool! (%d)\n", i, ipid);
ipid = -1;
session[i].ip_pool_index = ipid;
continue;
else
{
// It's a single ip address
- add_to_ip_pool(inet_addr(pool), 0);
+ add_to_ip_pool(ntohl(inet_addr(pool)), 0);
}
}
fclose(f);
snoop_addr.sin_addr.s_addr = destination;
snoop_addr.sin_port = ntohs(port);
- LOG(5, 0, 0, "Snooping %d byte packet to %s:%d\n", size,
+ LOG(5, 0, 0, "Snooping %d byte packet to %s:%u\n", size,
fmtaddr(snoop_addr.sin_addr.s_addr, 0),
htons(snoop_addr.sin_port));
// Start the timer routine off
time(&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);
initplugins();
initdata(optdebug, optconfig);
init_cli(hostname);
read_config_file();
+ update_config();
init_tbf(config->num_tbfs);
LOG(0, 0, 0, "L2TPNS version " VERSION "\n");
- LOG(0, 0, 0, "Copyright (c) 2003, 2004, 2005 Optus Internet Engineering\n");
+ LOG(0, 0, 0, "Copyright (c) 2003, 2004, 2005, 2006 Optus Internet Engineering\n");
LOG(0, 0, 0, "Copyright (c) 2002 FireBrick (Andrews & Arnold Ltd / Watchfront Ltd) - GPL licenced\n");
{
struct rlimit rlim;
LOG(0, 0, 0, "Can't lock pages: %s\n", strerror(errno));
}
- alarm(1);
-
- // Drop privileges here
- if (config->target_uid > 0 && geteuid() == 0)
- setuid(config->target_uid);
-
mainloop();
/* remove plugins (so cleanup code gets run) */
static void sighup_handler(int sig)
{
- if (log_stream)
- {
- if (log_stream != stderr)
- fclose(log_stream);
-
- log_stream = NULL;
- }
-
- read_config_file();
-}
-
-static void sigalrm_handler(int sig)
-{
- // Log current traffic stats
-
- snprintf(config->bandwidth, sizeof(config->bandwidth),
- "UDP-ETH:%1.0f/%1.0f ETH-UDP:%1.0f/%1.0f TOTAL:%0.1f IN:%u OUT:%u",
- (udp_rx / 1024.0 / 1024.0 * 8),
- (eth_tx / 1024.0 / 1024.0 * 8),
- (eth_rx / 1024.0 / 1024.0 * 8),
- (udp_tx / 1024.0 / 1024.0 * 8),
- ((udp_tx + udp_rx + eth_tx + eth_rx) / 1024.0 / 1024.0 * 8),
- udp_rx_pkt, eth_rx_pkt);
-
- udp_tx = udp_rx = 0;
- udp_rx_pkt = eth_rx_pkt = 0;
- eth_tx = eth_rx = 0;
-
- if (config->dump_speed)
- printf("%s\n", config->bandwidth);
-
- // Update the internal time counter
- time(&time_now);
- strftime(time_now_string, sizeof(time_now_string), "%Y-%m-%d %H:%M:%S", localtime(&time_now));
- alarm(1);
-
- {
- // Run timer hooks
- struct param_timer p = { time_now };
- run_plugins(PLUGIN_TIMER, &p);
- }
-
+ main_reload++;
}
static void shutdown_handler(int sig)
{
- LOG(1, 0, 0, "Shutting down\n");
main_quit = (sig == SIGQUIT) ? QUIT_SHUTDOWN : QUIT_FAILOVER;
}
MD5_CTX ctx;
*challenge_response = NULL;
- if (!*config->l2tpsecret)
+ if (!*config->l2tp_secret)
{
LOG(0, 0, 0, "LNS requested CHAP authentication, but no l2tp secret is defined\n");
return;
MD5_Init(&ctx);
MD5_Update(&ctx, &id, 1);
- MD5_Update(&ctx, config->l2tpsecret, strlen(config->l2tpsecret));
+ MD5_Update(&ctx, config->l2tp_secret, strlen(config->l2tp_secret));
MD5_Update(&ctx, challenge, challenge_length);
MD5_Final(*challenge_response, &ctx);
setbuf(log_stream, NULL);
}
+#define L2TP_HDRS (20+8+6+4) // L2TP data encaptulation: ip + udp + l2tp (data) + ppp (inc hdlc)
+#define TCP_HDRS (20+20) // TCP encapsulation: ip + tcp
+
+ if (config->l2tp_mtu <= 0) config->l2tp_mtu = 1500; // ethernet default
+ else if (config->l2tp_mtu < MINMTU) config->l2tp_mtu = MINMTU;
+ else if (config->l2tp_mtu > MAXMTU) config->l2tp_mtu = MAXMTU;
+
+ // reset MRU/MSS globals
+ MRU = config->l2tp_mtu - L2TP_HDRS;
+ if (MRU > PPPoE_MRU)
+ MRU = PPPoE_MRU;
+
+ MSS = MRU - TCP_HDRS;
+
// Update radius
config->numradiusservers = 0;
for (i = 0; i < MAXRADSERVER; i++)
LOG(0, 0, 0, "Can't write to PID file %s: %s\n", config->pid_file, strerror(errno));
}
}
-
- config->reload_config = 0;
}
static void read_config_file()
cli_do_file(f);
LOG(3, 0, 0, "Done reading config file\n");
fclose(f);
- update_config();
}
int sessionsetup(sessionidt s, tunnelidt t)
if (!session[s].ip)
{
LOG(0, s, t, " No IP allocated. The IP address pool is FULL!\n");
- sessionshutdown(s, "No IP addresses available.", 2, 7); // try another
+ sessionshutdown(s, "No IP addresses available.", CDN_TRY_ANOTHER, TERM_SERVICE_UNAVAILABLE);
return 0;
}
LOG(3, s, t, " No IP allocated. Assigned %s from pool\n",
// Make sure this is right
session[s].tunnel = t;
+ // Join a bundle if the MRRU option is accepted
+ if (session[s].mrru > 0 && !session[s].bundle)
+ {
+ LOG(3, s, t, "This session can be part of multilink bundle\n");
+ if (join_bundle(s))
+ cluster_send_bundle(session[s].bundle);
+ }
+
// zap old sessions with same IP and/or username
// Don't kill gardened sessions - doing so leads to a DoS
// from someone who doesn't need to know the password
continue;
}
- if (config->allow_duplicate_users) continue;
- if (session[s].walled_garden || session[i].walled_garden) continue;
+ if (config->allow_duplicate_users)
+ continue;
+
+ if (session[s].walled_garden || session[i].walled_garden)
+ continue;
+
+ // Allow duplicate sessions for guest account.
+ if (*config->guest_user && !strcasecmp(user, config->guest_user))
+ continue;
+
+ // Allow duplicate sessions for multilink ones of the same bundle.
+ if (session[s].bundle && session[i].bundle && session[s].bundle == session[i].bundle)
+ continue;
+
+ // Drop the new session in case of duplicate sessionss, not the old one.
if (!strcasecmp(user, session[i].user))
sessionkill(i, "Duplicate session for users");
}
if (session[s].throttle_in || session[s].throttle_out)
throttle_session(s, session[s].throttle_in, session[s].throttle_out);
- session[s].last_packet = time_now;
+ session[s].last_packet = session[s].last_data = time_now;
LOG(2, s, t, "Login by %s at %s from %s (%s)\n", session[s].user,
fmtaddr(htonl(session[s].ip), 0),
// check filters
if (new->filter_in && (new->filter_in > MAXFILTER || !ip_filters[new->filter_in - 1].name[0]))
{
- LOG(2, s, session[s].tunnel, "Dropping invalid input filter %d\n", (int) new->filter_in);
+ LOG(2, s, session[s].tunnel, "Dropping invalid input filter %u\n", (int) new->filter_in);
new->filter_in = 0;
}
if (new->filter_out && (new->filter_out > MAXFILTER || !ip_filters[new->filter_out - 1].name[0]))
{
- LOG(2, s, session[s].tunnel, "Dropping invalid output filter %d\n", (int) new->filter_out);
+ LOG(2, s, session[s].tunnel, "Dropping invalid output filter %u\n", (int) new->filter_out);
new->filter_out = 0;
}
run_plugin_done(p);
}
-static void processcontrol(uint8_t *buf, int len, struct sockaddr_in *addr, int alen)
+static void processcontrol(uint8_t *buf, int len, struct sockaddr_in *addr, int alen, struct in_addr *local)
{
struct nsctl request;
struct nsctl response;
r = pack_control(buf, NSCTL_MAX_PKT_SZ, response.type, response.argc, response.argv);
if (r > 0)
{
- sendto(controlfd, buf, r, 0, (const struct sockaddr *) addr, alen);
+ sendtofrom(controlfd, buf, r, 0, (const struct sockaddr *) addr, alen, local);
if (log_stream && config->debug >= 4)
{
LOG(4, 0, 0, "Sent [%s] ", fmtaddr(addr->sin_addr.s_addr, 0));
{
if (tunnel[i].state == TUNNELFREE)
{
- LOG(4, 0, i, "Assigning tunnel ID %d\n", i);
+ LOG(4, 0, i, "Assigning tunnel ID %u\n", i);
if (i > config->cluster_highest_tunnelid)
config->cluster_highest_tunnelid = i;
return i;
if (!session[s].opened)
continue;
- idle = time_now - session[s].last_packet;
+ idle = time_now - session[s].last_data;
idle /= 5 ; // In multiples of 5 seconds.
if (idle < 0)
idle = 0;
// Compute initial pad
MD5_Init(&ctx);
MD5_Update(&ctx, (unsigned char *) &m, 2);
- MD5_Update(&ctx, config->l2tpsecret, strlen(config->l2tpsecret));
+ MD5_Update(&ctx, config->l2tp_secret, strlen(config->l2tp_secret));
MD5_Update(&ctx, vector, vec_len);
MD5_Final(digest, &ctx);
if (d >= sizeof(digest))
{
MD5_Init(&ctx);
- MD5_Update(&ctx, config->l2tpsecret, strlen(config->l2tpsecret));
+ MD5_Update(&ctx, config->l2tp_secret, strlen(config->l2tp_secret));
MD5_Update(&ctx, last, sizeof(digest));
MD5_Final(digest, &ctx);
if (frag_offset)
{
- if (!rule->frag || rule->action == FILTER_ACTION_DENY)
+ // layer 4 deny rules are skipped
+ if (rule->action == FILTER_ACTION_DENY &&
+ (rule->src_ports.op || rule->dst_ports.op || rule->tcp_flag_op))
continue;
}
else
projects / l2tpns.git / blobdiff