// 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 1.108 2005/06/04 15:42:35 bodea Exp $";
+char const *cvs_id_l2tpns = "$Id: l2tpns.c,v 1.123 2005/08/12 08:35:16 bodea Exp $";
#include <arpa/inet.h>
#include <assert.h>
int udpfd = -1; // UDP file handle
int controlfd = -1; // Control signal handle
int clifd = -1; // Socket listening for CLI connections.
+int daefd = -1; // Socket listening for DAE connections.
int snoopfd = -1; // UDP file handle for sending out intercept data
int *radfds = NULL; // RADIUS requests file handles
int ifrfd = -1; // File descriptor for routing, etc
CONFIG("pid_file", pid_file, STRING),
CONFIG("random_device", random_device, STRING),
CONFIG("l2tp_secret", l2tpsecret, STRING),
+ 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("primary_dns", default_dns1, IPv4),
CONFIG("secondary_dns", default_dns2, IPv4),
CONFIG("primary_radius", radiusserver[0], IPv4),
CONFIG("radius_interim", radius_interim, INT),
CONFIG("radius_secret", radiussecret, STRING),
CONFIG("radius_authtypes", radius_authtypes_s, STRING),
+ CONFIG("radius_dae_port", radius_dae_port, SHORT),
CONFIG("allow_duplicate_users", allow_duplicate_users, BOOL),
CONFIG("bind_address", bind_address, IPv4),
CONFIG("peer_address", peer_address, IPv4),
"plugin_kill_session",
"plugin_control",
"plugin_radius_response",
+ "plugin_radius_reset",
"plugin_become_master",
"plugin_new_session_master",
};
sessionlocalt *sess_local = NULL; // Array of local per-session counters.
radiust *radius = NULL; // Array of radius structures.
ippoolt *ip_address_pool = NULL; // Array of dynamic IP addresses.
-ip_filtert *ip_filters = NULL; // Array of named filters.
+ip_filtert *ip_filters = NULL; // Array of named filters.
static controlt *controlfree = 0;
struct Tstats *_statistics = NULL;
#ifdef RINGBUFFER
static void dump_acct_info(int all);
static void sighup_handler(int sig);
static void sigalrm_handler(int sig);
-static void sigterm_handler(int sig);
-static void sigquit_handler(int sig);
+static void shutdown_handler(int sig);
static void sigchild_handler(int sig);
-static void build_chap_response(char *challenge, uint8_t id, uint16_t challenge_length, char **challenge_response);
+static void build_chap_response(uint8_t *challenge, uint8_t id, uint16_t challenge_length, uint8_t **challenge_response);
static void update_config(void);
static void read_config_file(void);
static void initplugins(void);
// on slaves, alow BGP to withdraw cleanly before exiting
#define QUIT_DELAY 5
+// quit actions (master)
+#define QUIT_FAILOVER 1 // SIGTERM: exit when all control messages have been acked (for cluster failover)
+#define QUIT_SHUTDOWN 2 // SIGQUIT: shutdown sessions/tunnels, reject new connections
+
// return internal time (10ths since process startup), set f if given
static clockt now(double *f)
{
va_end(ap);
}
-void _log_hex(int level, const char *title, const char *data, int maxsize)
+void _log_hex(int level, const char *title, const uint8_t *data, int maxsize)
{
int i, j;
- const uint8_t *d = (const uint8_t *) data;
+ const uint8_t *d = data;
if (config->debug < level) return;
return;
// close previous source, if any
- if (rand_fd >= 0) close(rand_fd);
+ if (rand_fd >= 0)
+ close(rand_fd);
rand_fd = -1;
path, strerror(errno));
}
}
-
- // no source: seed prng
- {
- unsigned seed = time_now ^ getpid();
- LOG(4, 0, 0, "Seeding the pseudo random generator: %u\n", seed);
- srand(seed);
- }
}
// fill buffer with random data
strerror(errno));
// fall back to rand()
- initrandom(0);
+ initrandom(NULL);
}
n = 0;
tunidx = ifr.ifr_ifindex;
// Only setup IPv6 on the tun device if we have a configured prefix
- if (config->ipv6_prefix.s6_addr[0] > 0) {
+ if (config->ipv6_prefix.s6_addr[0]) {
ifr6fd = socket(PF_INET6, SOCK_DGRAM, 0);
// Link local address is FE80::1
}
}
-// set up UDP port
+// set up UDP ports
static void initudp(void)
{
int on = 1;
LOG(0, 0, 0, "Error in UDP bind: %s\n", strerror(errno));
exit(1);
}
- snoopfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
// Control
memset(&addr, 0, sizeof(addr));
LOG(0, 0, 0, "Error in control bind: %s\n", strerror(errno));
exit(1);
}
+
+ // Dynamic Authorization Extensions to RADIUS
+ memset(&addr, 0, sizeof(addr));
+ addr.sin_family = AF_INET;
+ 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)
+ {
+ LOG(0, 0, 0, "Error in DAE bind: %s\n", strerror(errno));
+ exit(1);
+ }
+
+ // Intercept
+ snoopfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
}
//
CSTAT(sessionbyipv6);
if (!memcmp(&config->ipv6_prefix, &ip, 8) ||
- (ip.s6_addr[0] == 0xFE && ip.s6_addr[1] == 0x80 &&
- (ip.s6_addr16[1] == ip.s6_addr16[2] == ip.s6_addr16[3] == 0))) {
+ (ip.s6_addr[0] == 0xFE &&
+ ip.s6_addr[1] == 0x80 &&
+ ip.s6_addr16[1] == 0 &&
+ ip.s6_addr16[2] == 0 &&
+ ip.s6_addr16[3] == 0)) {
s = lookup_ipmap(*(in_addr_t *) &ip.s6_addr[8]);
} else {
s = lookup_ipv6map(ip);
// process outgoing (to tunnel) IP
//
-static void processipout(uint8_t * buf, int len)
+static void processipout(uint8_t *buf, int len)
{
sessionidt s;
sessiont *sp;
tunnelidt t;
in_addr_t ip;
- char *data = buf; // Keep a copy of the originals.
+ uint8_t *data = buf; // Keep a copy of the originals.
int size = len;
uint8_t b[MAXETHER + 20];
// Add on L2TP header
{
- uint8_t *p = makeppp(b, sizeof(b), buf, len, t, s, PPPIP);
+ uint8_t *p = makeppp(b, sizeof(b), buf, len, s, t, PPPIP);
if (!p) return;
tunnelsend(b, len + (p-b), t); // send it...
}
in_addr_t ip;
struct in6_addr ip6;
- char *data = buf; // Keep a copy of the originals.
+ uint8_t *data = buf; // Keep a copy of the originals.
int size = len;
uint8_t b[MAXETHER + 20];
// Add on L2TP header
{
- uint8_t *p = makeppp(b, sizeof(b), buf, len, t, s, PPPIPV6);
+ uint8_t *p = makeppp(b, sizeof(b), buf, len, s, t, PPPIPV6);
if (!p) return;
tunnelsend(b, len + (p-b), t); // send it...
}
// Add on L2TP header
{
- uint8_t *p = makeppp(b, sizeof(b), buf, len, t, s, PPPIP);
+ uint8_t *p = makeppp(b, sizeof(b), buf, len, s, t, PPPIP);
if (!p) return;
tunnelsend(b, len + (p-b), t); // send it...
}
}
// add a binary AVP
-static void controlb(controlt * c, uint16_t avp, char *val, unsigned int len, uint8_t m)
+static void controlb(controlt * c, uint16_t avp, uint8_t *val, unsigned int len, uint8_t m)
{
uint16_t l = ((m ? 0x8000 : 0) + len + 6);
*(uint16_t *) (c->buf + c->length + 0) = htons(l);
}
// add a control message to a tunnel, and send if within window
-static void controladd(controlt * c, tunnelidt t, sessionidt far)
+static void controladd(controlt *c, sessionidt far, tunnelidt t)
{
*(uint16_t *) (c->buf + 2) = htons(c->length); // length
*(uint16_t *) (c->buf + 4) = htons(tunnel[t].far); // tunnel
}
// add/remove filters from session (-1 = no change)
-static void filter_session(sessionidt s, int filter_in, int filter_out)
+void filter_session(sessionidt s, int filter_in, int filter_out)
{
if (!session[s].opened)
return; // No-one home.
if (session[s].ip && !walled_garden && !session[s].die)
{
// RADIUS Stop message
- uint16_t r = sess_local[s].radius;
- if (!r)
- r = radiusnew(s);
-
+ uint16_t r = radiusnew(s);
if (r)
{
// stop, if not already trying
free_ip_address(s);
// unroute IPv6, if setup
- if (session[s].flags & SF_IPV6_ROUTED)
+ if (session[s].ppp.ipv6cp == Opened && session[s].ipv6prefixlen)
route6set(s, session[s].ipv6route, session[s].ipv6prefixlen, 0);
}
controlt *c = controlnew(14); // sending CDN
if (error)
{
- char buf[4];
+ uint8_t buf[4];
*(uint16_t *) buf = htons(result);
*(uint16_t *) (buf+2) = htons(error);
controlb(c, 1, buf, 4, 1);
control16(c, 1, result, 1);
control16(c, 14, s, 1); // assigned session (our end)
- controladd(c, session[s].tunnel, session[s].far); // send the message
+ controladd(c, session[s].far, session[s].tunnel); // send the message
}
if (!session[s].die)
if (session[s].filter_in) ip_filters[session[s].filter_in - 1].used--;
if (session[s].filter_out) ip_filters[session[s].filter_out - 1].used--;
+ // clear PPP state
+ memset(&session[s].ppp, 0, sizeof(session[s].ppp));
+ sess_local[s].lcp.restart = 0;
+ sess_local[s].ipcp.restart = 0;
+ sess_local[s].ipv6cp.restart = 0;
+ sess_local[s].ccp.restart = 0;
+
cluster_send_session(s);
}
-void sendipcp(tunnelidt t, sessionidt s)
+void sendipcp(sessionidt s, tunnelidt t)
{
uint8_t buf[MAXCONTROL];
- uint16_t r = sess_local[s].radius;
uint8_t *q;
CSTAT(sendipcp);
+ LOG(3, s, t, "IPCP: send ConfigReq\n");
- if (!r)
- r = radiusnew(s);
-
- if (!r)
- {
- sessionshutdown(s, "No free RADIUS sessions for IPCP", 3, 0);
- return;
- }
-
- if (radius[r].state != RADIUSIPCP)
- {
- radius[r].state = RADIUSIPCP;
- radius[r].try = 0;
- }
-
- radius[r].retry = backoff(radius[r].try++);
- if (radius[r].try > 10)
+ if (!session[s].unique_id)
{
- radiusclear(r, s); // Clear radius session.
- sessionshutdown(s, "No reply to IPCP.", 3, 0);
- return;
+ if (!++last_id) ++last_id; // skip zero
+ session[s].unique_id = last_id;
}
- q = makeppp(buf,sizeof(buf), 0, 0, t, s, PPPIPCP);
+ q = makeppp(buf,sizeof(buf), 0, 0, s, t, PPPIPCP);
if (!q) return;
*q = ConfigReq;
- q[1] = r >> RADIUS_SHIFT; // ID, dont care, we only send one type of request
- *(uint16_t *) (q + 2) = htons(10);
- q[4] = 3;
- q[5] = 6;
+ q[1] = session[s].unique_id & 0xf; // ID, dont care, we only send one type of request
+ *(uint16_t *) (q + 2) = htons(10); // packet length
+ q[4] = 3; // ip address option
+ q[5] = 6; // option length
*(in_addr_t *) (q + 6) = config->peer_address ? config->peer_address :
config->bind_address ? config->bind_address :
my_address; // send my IP
tunnelsend(buf, 10 + (q - buf), t); // send it
- session[s].flags &= ~SF_IPCP_ACKED; // Clear flag.
-
- // If we have an IPv6 prefix length configured, assume we should
- // try to negotiate an IPv6 session as well. Unless we've had a
- // (N)ACK for IPV6CP.
- if (config->ipv6_prefix.s6_addr[0] > 0 &&
- !(session[s].flags & SF_IPV6CP_ACKED) &&
- !(session[s].flags & SF_IPV6_NACKED))
- {
- q = makeppp(buf,sizeof(buf), 0, 0, t, s, PPPIPV6CP);
- if (!q) return;
-
- *q = ConfigReq;
- q[1] = r >> RADIUS_SHIFT; // ID, don't care, we
- // only send one type
- // of request
- *(uint16_t *) (q + 2) = htons(14);
- q[4] = 1;
- q[5] = 10;
- *(uint32_t *) (q + 6) = 0; // We'll be prefix::1
- *(uint32_t *) (q + 10) = 0;
- q[13] = 1;
-
- tunnelsend(buf, 14 + (q - buf), t); // send it
- }
+}
+
+void sendipv6cp(sessionidt s, tunnelidt t)
+{
+ uint8_t buf[MAXCONTROL];
+ uint8_t *q;
+
+ CSTAT(sendipv6cp);
+ LOG(3, s, t, "IPV6CP: send ConfigReq\n");
+
+ q = makeppp(buf,sizeof(buf), 0, 0, s, t, PPPIPV6CP);
+ if (!q) return;
+
+ *q = ConfigReq;
+ q[1] = session[s].unique_id & 0xf; // ID, don't care, we
+ // only send one type
+ // of request
+ *(uint16_t *) (q + 2) = htons(14);
+ q[4] = 1; // interface identifier option
+ q[5] = 10; // option length
+ *(uint32_t *) (q + 6) = 0; // We'll be prefix::1
+ *(uint32_t *) (q + 10) = 0;
+ q[13] = 1;
+
+ tunnelsend(buf, 14 + (q - buf), t); // send it
}
static void sessionclear(sessionidt s)
// close session
for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
if (session[s].tunnel == t)
- sessionshutdown(s, reason, 3, 0);
+ sessionshutdown(s, reason, 0, 0);
tunnel[t].state = TUNNELDIE;
tunnel[t].die = TIME + 700; // Clean up in 70 seconds
controlt *c = controlnew(4); // sending StopCCN
if (error)
{
- char buf[64];
+ uint8_t buf[64];
int l = 4;
*(uint16_t *) buf = htons(result);
*(uint16_t *) (buf+2) = htons(error);
control16(c, 1, result, 1);
control16(c, 9, t, 1); // assigned tunnel (our end)
- controladd(c, t, 0); // send the message
+ controladd(c, 0, t); // send the message
}
}
// read and process packet on tunnel (UDP)
-void processudp(uint8_t * buf, int len, struct sockaddr_in *addr)
+void processudp(uint8_t *buf, int len, struct sockaddr_in *addr)
{
- char *chapresponse = NULL;
+ uint8_t *chapresponse = NULL;
uint16_t l = len, t = 0, s = 0, ns = 0, nr = 0;
uint8_t *p = buf + 2;
uint16_t message = 0xFFFF; // message type
uint8_t fatal = 0;
uint8_t mandatory = 0;
- uint8_t authtype = 0; // proxy auth type
uint16_t asession = 0; // assigned session
uint32_t amagic = 0; // magic number
uint8_t aflags = 0; // flags from last LCF
continue;
}
- LOG(4, s, t, "Hidden AVP\n");
-
// Unhide the AVP
unhide_value(b, n, mtype, session[s].random_vector, session[s].random_vector_length);
n = orig_len;
}
- LOG(4, s, t, " AVP %d (%s) len %d\n", mtype, avp_name(mtype), n);
+ LOG(4, s, t, " AVP %d (%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_message_type(message));
+ LOG(4, s, t, " Message type = %d (%s)\n", *b, l2tp_code(message));
break;
case 1: // result code
{
const char* resdesc = "(unknown)";
if (message == 4)
{ /* StopCCN */
- resdesc = stopccn_result_code(rescode);
+ resdesc = l2tp_stopccn_result_code(rescode);
}
else if (message == 14)
{ /* CDN */
- resdesc = cdn_result_code(rescode);
+ resdesc = l2tp_cdn_result_code(rescode);
}
LOG(4, s, t, " Result Code %d: %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, error_code(errcode));
+ LOG(4, s, t, " Error Code %d: %s\n", errcode, l2tp_error_code(errcode));
}
if (n > 4)
LOG(4, s, t, " Error String: %.*s\n", n-4, b+4);
case 29: // Proxy Authentication Type
{
uint16_t atype = ntohs(*(uint16_t *)b);
- LOG(4, s, t, " Proxy Auth Type %d (%s)\n", atype, auth_type(atype));
- if (atype == 2)
- authtype = AUTHCHAP;
- else if (atype == 3)
- authtype = AUTHPAP;
-
+ LOG(4, s, t, " Proxy Auth Type %d (%s)\n", atype, ppp_auth_type(atype));
break;
}
case 30: // Proxy Authentication Name
case 31: // Proxy Authentication Challenge
{
LOG(4, s, t, " Proxy Auth Challenge\n");
- if (sess_local[s].radius)
- memcpy(radius[sess_local[s].radius].auth, b, 16);
break;
}
case 32: // Proxy Authentication ID
{
uint16_t authid = ntohs(*(uint16_t *)(b));
LOG(4, s, t, " Proxy Auth ID (%d)\n", authid);
- if (sess_local[s].radius)
- radius[sess_local[s].radius].id = authid;
break;
}
case 33: // Proxy Authentication Response
{
if (*p == 5 && p[1] == 6) // Magic-Number
amagic = ntohl(*(uint32_t *) (p + 2));
- else if (*p == 3 && p[1] == 4 && *(uint16_t *) (p + 2) == htons(PPPPAP)) // Authentication-Protocol (PAP)
- authtype = AUTHPAP;
- else if (*p == 3 && p[1] == 5 && *(uint16_t *) (p + 2) == htons(PPPCHAP) && p[4] == 5) // Authentication-Protocol (CHAP)
- authtype = AUTHCHAP;
else if (*p == 7) // Protocol-Field-Compression
aflags |= SESSIONPFC;
else if (*p == 8) // Address-and-Control-Field-Compression
case 36: // Random Vector
LOG(4, s, t, " Random Vector received. Enabled AVP Hiding.\n");
memset(session[s].random_vector, 0, sizeof(session[s].random_vector));
+ if (n > sizeof(session[s].random_vector))
+ n = sizeof(session[s].random_vector);
memcpy(session[s].random_vector, b, n);
session[s].random_vector_length = n;
break;
switch (message)
{
case 1: // SCCRQ - Start Control Connection Request
+ tunnel[t].state = TUNNELOPENING;
+ if (main_quit != QUIT_SHUTDOWN)
{
controlt *c = controlnew(2); // sending SCCRP
control16(c, 2, version, 1); // protocol version
controls(c, 7, tunnel[t].hostname, 1); // host name (TBA)
if (chapresponse) controlb(c, 13, chapresponse, 16, 1); // Challenge response
control16(c, 9, t, 1); // assigned tunnel
- controladd(c, t, 0); // send the resply
+ controladd(c, 0, t); // send the resply
+ }
+ else
+ {
+ tunnelshutdown(t, "Shutting down", 6, 0, 0);
}
- tunnel[t].state = TUNNELOPENING;
break;
case 2: // SCCRP
tunnel[t].state = TUNNELOPEN;
// TBA
break;
case 10: // ICRQ
- if (sessionfree)
+ if (sessionfree && main_quit != QUIT_SHUTDOWN)
{
- uint16_t r;
+ controlt *c = controlnew(11); // ICRP
s = sessionfree;
sessionfree = session[s].next;
if (s > config->cluster_highest_sessionid)
config->cluster_highest_sessionid = s;
- // make a RADIUS session
- if ((r = radiusnew(s)))
- {
- controlt *c = controlnew(11); // sending ICRP
- 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);
- control16(c, 14, s, 1); // assigned session
- controladd(c, t, asession); // send the reply
-
- strncpy(radius[r].calling, calling, sizeof(radius[r].calling) - 1);
- strncpy(session[s].called, called, sizeof(session[s].called) - 1);
- strncpy(session[s].calling, calling, sizeof(session[s].calling) - 1);
- STAT(session_created);
- break;
- }
+ 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);
+ control16(c, 14, s, 1); // assigned session
+ controladd(c, asession, t); // send the reply
+ strncpy(session[s].called, called, sizeof(session[s].called) - 1);
+ strncpy(session[s].calling, calling, sizeof(session[s].calling) - 1);
- LOG(1, s, t, "No free RADIUS sessions for ICRQ\n");
- sessionclear(s);
- }
- else
- {
- STAT(session_overflow);
- LOG(1, 0, t, "No free sessions\n");
+ session[s].ppp.phase = Establish;
+ session[s].ppp.lcp = Starting;
+
+ STAT(session_created);
+ break;
}
{
controlt *c = controlnew(14); // CDN
- control16(c, 1, 4, 1); // temporary lack of resources
- controladd(c, session[s].tunnel, asession); // send the message
+ if (!sessionfree)
+ {
+ STAT(session_overflow);
+ LOG(1, 0, t, "No free sessions\n");
+ control16(c, 1, 4, 0); // temporary lack of resources
+ }
+ else
+ control16(c, 1, 2, 7); // shutting down, try another
+
+ controladd(c, asession, t); // send the message
}
return;
case 11: // ICRP
if (amagic == 0) amagic = time_now;
session[s].magic = amagic; // set magic number
session[s].l2tp_flags = aflags; // set flags received
- LOG(3, s, t, "Magic %X Flags %X\n", amagic, aflags);
controlnull(t); // ack
- // proxy authentication type is not supported
- if (!(config->radius_authtypes & authtype))
- authtype = config->radius_authprefer;
// start LCP
- sendlcp(t, s, authtype);
+ 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;
+
break;
case 14: // CDN
controlnull(t); // ack
{
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(t, s, p, l);
+ processpap(s, t, p, l);
}
else if (prot == 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(t, s, p, l);
+ processchap(s, t, p, l);
}
else if (prot == 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(t, s, p, l);
+ processlcp(s, t, p, l);
}
else if (prot == 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(t, s, p, l);
+ processipcp(s, t, p, l);
}
else if (prot == PPPIPV6CP)
{
- if (config->ipv6_prefix.s6_addr[0] > 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(t, s, p, l);
- }
- else
- {
- LOG(1, s, t, "IPv6 not configured; ignoring IPv6CP\n");
- }
+ 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)
{
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(t, s, p, l);
+ processccp(s, t, p, l);
}
else if (prot == PPPIP)
{
return;
}
- processipin(t, s, p, l);
+ processipin(s, t, p, l);
}
else if (prot == PPPIPV6)
{
- if (!config->ipv6_prefix.s6_addr[0] > 0)
+ if (!config->ipv6_prefix.s6_addr[0])
{
LOG(1, s, t, "IPv6 not configured; yet received IPv6 packet. Ignoring.\n");
return;
return;
}
- processipv6in(t, s, p, l);
+ processipv6in(s, t, p, l);
}
else
{
if (*(uint16_t *) (buf + 2) == htons(PKTIP)) // IPv4
processipout(buf, len);
else if (*(uint16_t *) (buf + 2) == htons(PKTIPV6) // IPV6
- && config->ipv6_prefix.s6_addr[0] > 0)
+ && config->ipv6_prefix.s6_addr[0])
processipv6out(buf, len);
// Else discard.
if (tunnel[t].state == TUNNELOPEN && tunnel[t].lastrec < TIME + 600)
{
controlt *c = controlnew(6); // sending HELLO
- controladd(c, t, 0); // send the message
+ controladd(c, 0, t); // send the message
LOG(3, 0, t, "Sending HELLO message\n");
t_actions++;
}
continue;
}
- if (session[s].ip && !(session[s].flags & SF_IPCP_ACKED))
+ // PPP timeouts
+ if (sess_local[s].lcp.restart <= time_now)
{
- // IPCP has not completed yet. Resend
- LOG(3, s, session[s].tunnel, "No ACK for initial IPCP ConfigReq... resending\n");
- sendipcp(session[s].tunnel, s);
- s_actions++;
+ int next_state = session[s].ppp.lcp;
+ switch (session[s].ppp.lcp)
+ {
+ case RequestSent:
+ case AckReceived:
+ next_state = RequestSent;
+
+ case AckSent:
+ 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, session[s].tunnel, sess_local[s].lcp_authtype);
+ change_state(s, lcp, next_state);
+ }
+ else
+ {
+ sessionshutdown(s, "No response to LCP ConfigReq.", 3, 0);
+ STAT(session_timeout);
+ }
+
+ s_actions++;
+ }
+
+ if (session[s].die)
+ continue;
+ }
+
+ if (sess_local[s].ipcp.restart <= time_now)
+ {
+ int next_state = session[s].ppp.ipcp;
+ switch (session[s].ppp.ipcp)
+ {
+ case RequestSent:
+ case AckReceived:
+ next_state = RequestSent;
+
+ case AckSent:
+ 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, session[s].tunnel);
+ change_state(s, ipcp, next_state);
+ }
+ else
+ {
+ sessionshutdown(s, "No response to IPCP ConfigReq.", 3, 0);
+ STAT(session_timeout);
+ }
+
+ s_actions++;
+ }
+
+ if (session[s].die)
+ continue;
+ }
+
+ if (sess_local[s].ipv6cp.restart <= time_now)
+ {
+ int next_state = session[s].ppp.ipv6cp;
+ switch (session[s].ppp.ipv6cp)
+ {
+ case RequestSent:
+ case AckReceived:
+ next_state = RequestSent;
+
+ case AckSent:
+ 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, session[s].tunnel);
+ change_state(s, ipv6cp, next_state);
+ }
+ else
+ {
+ LOG(3, s, session[s].tunnel, "No ACK for IPV6CP ConfigReq\n");
+ change_state(s, ipv6cp, Stopped);
+ }
+
+ s_actions++;
+ }
+ }
+
+ if (sess_local[s].ccp.restart <= time_now)
+ {
+ int next_state = session[s].ppp.ccp;
+ switch (session[s].ppp.ccp)
+ {
+ case RequestSent:
+ case AckReceived:
+ next_state = RequestSent;
+
+ case AckSent:
+ 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, session[s].tunnel);
+ change_state(s, ccp, next_state);
+ }
+ else
+ {
+ LOG(3, s, session[s].tunnel, "No ACK for CCP ConfigReq\n");
+ change_state(s, ccp, Stopped);
+ }
+
+ s_actions++;
+ }
}
// Drop sessions who have not responded within IDLE_TIMEOUT seconds
}
// No data in ECHO_TIMEOUT seconds, send LCP ECHO
- if (session[s].user[0] && (time_now - session[s].last_packet >= ECHO_TIMEOUT))
+ if (session[s].ppp.phase >= Establish && (time_now - session[s].last_packet >= ECHO_TIMEOUT))
{
uint8_t b[MAXCONTROL] = {0};
- uint8_t *q = makeppp(b, sizeof(b), 0, 0, session[s].tunnel, s, PPPLCP);
+ uint8_t *q = makeppp(b, sizeof(b), 0, 0, s, session[s].tunnel, PPPLCP);
if (!q) continue;
*q = EchoReq;
&& !sess_local[s].radius // RADIUS already in progress
&& time_now - sess_local[s].last_interim >= config->radius_interim)
{
- if (!(r = radiusnew(s)))
+ int rad = radiusnew(s);
+ if (!rad)
{
LOG(1, s, session[s].tunnel, "No free RADIUS sessions for Interim message\n");
STAT(radius_overflow);
LOG(3, s, session[s].tunnel, "Sending RADIUS Interim for %s (%u)\n",
session[s].user, session[s].unique_id);
- radiussend(r, RADIUSINTERIM);
+ radiussend(rad, RADIUSINTERIM);
sess_local[s].last_interim = time_now;
s_actions++;
}
return 0;
}
+ if (main_quit == QUIT_SHUTDOWN)
+ {
+ static int dropped = 0;
+ if (!dropped)
+ {
+ int i;
+
+ LOG(1, 0, 0, "Dropping sessions and tunnels\n");
+ for (i = 1; i < MAXTUNNEL; i++)
+ if (tunnel[i].ip || tunnel[i].state)
+ tunnelshutdown(i, "L2TPNS Closing", 6, 0, 0);
+
+ dropped = 1;
+ }
+ }
+
if (start_busy_wait == 0)
start_busy_wait = TIME;
# include "fake_epoll.h"
#endif
-// the base set of fds polled: control, cli, udp, tun, cluster
-#define BASE_FDS 5
+// the base set of fds polled: cli, cluster, tun, udp, control, dae
+#define BASE_FDS 6
// additional polled fds
#ifdef BGP
exit(1);
}
- LOG(4, 0, 0, "Beginning of main loop. udpfd=%d, tunfd=%d, cluster_sockfd=%d, controlfd=%d\n",
- udpfd, tunfd, cluster_sockfd, controlfd);
+ LOG(4, 0, 0, "Beginning of main loop. clifd=%d, cluster_sockfd=%d, tunfd=%d, udpfd=%d, controlfd=%d, daefd=%d\n",
+ clifd, cluster_sockfd, tunfd, udpfd, controlfd, daefd);
/* setup our fds to poll for input */
{
e.events = EPOLLIN;
i = 0;
- d[i].type = FD_TYPE_CONTROL;
- e.data.ptr = &d[i++];
- epoll_ctl(epollfd, EPOLL_CTL_ADD, controlfd, &e);
-
d[i].type = FD_TYPE_CLI;
e.data.ptr = &d[i++];
epoll_ctl(epollfd, EPOLL_CTL_ADD, clifd, &e);
- d[i].type = FD_TYPE_UDP;
+ d[i].type = FD_TYPE_CLUSTER;
e.data.ptr = &d[i++];
- epoll_ctl(epollfd, EPOLL_CTL_ADD, udpfd, &e);
+ epoll_ctl(epollfd, EPOLL_CTL_ADD, cluster_sockfd, &e);
d[i].type = FD_TYPE_TUN;
e.data.ptr = &d[i++];
epoll_ctl(epollfd, EPOLL_CTL_ADD, tunfd, &e);
- d[i].type = FD_TYPE_CLUSTER;
+ d[i].type = FD_TYPE_UDP;
e.data.ptr = &d[i++];
- epoll_ctl(epollfd, EPOLL_CTL_ADD, cluster_sockfd, &e);
+ epoll_ctl(epollfd, EPOLL_CTL_ADD, udpfd, &e);
+
+ d[i].type = FD_TYPE_CONTROL;
+ e.data.ptr = &d[i++];
+ epoll_ctl(epollfd, EPOLL_CTL_ADD, controlfd, &e);
+
+ d[i].type = FD_TYPE_DAE;
+ e.data.ptr = &d[i++];
+ epoll_ctl(epollfd, EPOLL_CTL_ADD, daefd, &e);
}
#ifdef BGP
continue;
LOG(0, 0, 0, "Error returned from select(): %s\n", strerror(errno));
- main_quit++;
- break;
+ break; // exit
}
if (n)
{
struct sockaddr_in addr;
- int alen, c, s;
+ socklen_t alen;
+ int c, s;
int udp_ready = 0;
int tun_ready = 0;
int cluster_ready = 0;
struct event_data *d = events[i].data.ptr;
switch (d->type)
{
- case FD_TYPE_CONTROL: // nsctl commands
- alen = sizeof(addr);
- processcontrol(buf, recvfrom(controlfd, buf, sizeof(buf), MSG_WAITALL, (void *) &addr, &alen), &addr, alen);
- n--;
- break;
-
case FD_TYPE_CLI: // CLI connections
{
int cli;
}
// these are handled below, with multiple interleaved reads
- case FD_TYPE_UDP: udp_ready++; break;
- case FD_TYPE_TUN: tun_ready++; break;
case FD_TYPE_CLUSTER: cluster_ready++; break;
+ case FD_TYPE_TUN: tun_ready++; break;
+ case FD_TYPE_UDP: udp_ready++; break;
+
+ case FD_TYPE_CONTROL: // nsctl commands
+ alen = sizeof(addr);
+ processcontrol(buf, recvfrom(controlfd, buf, sizeof(buf), MSG_WAITALL, (void *) &addr, &alen), &addr, alen);
+ 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);
+ n--;
+ break;
case FD_TYPE_RADIUS: // RADIUS response
s = recv(radfds[d->index], buf, sizeof(buf), 0);
//
// Important!!! We MUST not process any packets past this point!
- LOG(1, 0, 0, "Clean shutdown complete\n");
+ LOG(1, 0, 0, "Shutdown complete\n");
}
static void stripdomain(char *host)
config->num_tbfs = MAXTBFS;
config->rl_rate = 28; // 28kbps
config->cluster_master_min_adv = 1;
+ config->ppp_restart_time = 3;
+ config->ppp_max_configure = 10;
+ config->ppp_max_failure = 5;
strcpy(config->random_device, RANDOMDEVICE);
log_stream = stderr;
LOG(1, 0, 0, "IP address pool is %d addresses\n", ip_pool_size - 1);
}
-void snoop_send_packet(char *packet, uint16_t size, in_addr_t destination, uint16_t port)
+void snoop_send_packet(uint8_t *packet, uint16_t size, in_addr_t destination, uint16_t port)
{
struct sockaddr_in snoop_addr = {0};
if (!destination || !port || snoopfd <= 0 || size <= 0 || !packet)
initrad();
initippool();
- signal(SIGHUP, sighup_handler);
- signal(SIGTERM, sigterm_handler);
- signal(SIGINT, sigterm_handler);
- signal(SIGQUIT, sigquit_handler);
+ // seed prng
+ {
+ unsigned seed = time_now ^ getpid();
+ LOG(4, 0, 0, "Seeding the pseudo random generator: %u\n", seed);
+ srand(seed);
+ }
+
+ signal(SIGHUP, sighup_handler);
signal(SIGCHLD, sigchild_handler);
+ signal(SIGTERM, shutdown_handler);
+ signal(SIGINT, shutdown_handler);
+ signal(SIGQUIT, shutdown_handler);
// Prevent us from getting paged out
if (config->lock_pages)
}
-static void sigterm_handler(int sig)
+static void shutdown_handler(int sig)
{
- LOG(1, 0, 0, "Shutting down cleanly\n");
- main_quit++;
-}
-
-static void sigquit_handler(int sig)
-{
- int i;
-
- LOG(1, 0, 0, "Shutting down without saving sessions\n");
-
- if (config->cluster_iam_master)
- {
- for (i = 1; i < MAXSESSION; i++)
- {
- if (session[i].opened)
- sessionkill(i, "L2TPNS Closing");
- }
- for (i = 1; i < MAXTUNNEL; i++)
- {
- if (tunnel[i].ip || tunnel[i].state)
- tunnelshutdown(i, "L2TPNS Closing", 6, 0, 0);
- }
- }
-
- main_quit++;
+ LOG(1, 0, 0, "Shutting down\n");
+ main_quit = (sig == SIGQUIT) ? QUIT_SHUTDOWN : QUIT_FAILOVER;
}
static void sigchild_handler(int sig)
;
}
-static void build_chap_response(char *challenge, uint8_t id, uint16_t challenge_length, char **challenge_response)
+static void build_chap_response(uint8_t *challenge, uint8_t id, uint16_t challenge_length, uint8_t **challenge_response)
{
MD5_CTX ctx;
*challenge_response = NULL;
LOG(4, 0, 0, " Building challenge response for CHAP request\n");
- *challenge_response = (char *)calloc(17, 1);
+ *challenge_response = calloc(17, 1);
- MD5Init(&ctx);
- MD5Update(&ctx, &id, 1);
- MD5Update(&ctx, config->l2tpsecret, strlen(config->l2tpsecret));
- MD5Update(&ctx, challenge, challenge_length);
- MD5Final(*challenge_response, &ctx);
+ MD5_Init(&ctx);
+ MD5_Update(&ctx, &id, 1);
+ MD5_Update(&ctx, config->l2tpsecret, strlen(config->l2tpsecret));
+ MD5_Update(&ctx, challenge, challenge_length);
+ MD5_Final(*challenge_response, &ctx);
return;
}
strcat(config->radius_authtypes_s, ", pap");
}
+ if (!config->radius_dae_port)
+ config->radius_dae_port = DAEPORT;
+
// re-initialise the random number source
initrandom(config->random_device);
update_config();
}
-int sessionsetup(tunnelidt t, sessionidt s)
+int sessionsetup(sessionidt s, tunnelidt t)
{
// A session now exists, set it up
in_addr_t ip;
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);
+ sessionshutdown(s, "No IP addresses available.", 2, 7); // try another
return 0;
}
LOG(3, s, t, " No IP allocated. Assigned %s from pool\n",
cache_ipmap(session[s].ip, s);
}
- if (!session[s].unique_id)
- {
- // did this session just finish radius?
- LOG(3, s, t, "Sending initial IPCP to client\n");
- sendipcp(t, s);
- session[s].unique_id = ++last_id;
- }
+ sess_local[s].lcp_authtype = 0; // RADIUS authentication complete
+ lcp_open(s, t); // transition to Network phase and send initial IPCP
// Run the plugin's against this new session.
{
}
// check v6 routing
- if (new->flags & SF_IPV6_ROUTED && !(session[s].flags & SF_IPV6_ROUTED))
+ if (new->ipv6prefixlen && new->ppp.ipv6cp == Opened && session[s].ppp.ipv6cp != Opened)
route6set(s, new->ipv6route, new->ipv6prefixlen, 1);
// check filters
// for walking the sessions to forward byte counts to the master.
config->cluster_highest_sessionid = s;
- // TEMP: old session struct used a uint32_t to define the throttle
- // speed for both up/down, new uses a uint16_t for each. Deal with
- // sessions from an old master for migration.
- if (new->throttle_out == 0 && new->tbf_out)
- new->throttle_out = new->throttle_in;
-
memcpy(&session[s], new, sizeof(session[s])); // Copy over..
// Do fixups into address pool.
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 nsctl request;
struct nsctl response;
uint8_t digest[16];
uint8_t *last;
size_t d = 0;
+ uint16_t m = htons(type);
// Compute initial pad
- MD5Init(&ctx);
- MD5Update(&ctx, (uint8_t) (type >> 8) & 0xff, 1);
- MD5Update(&ctx, (uint8_t) type & 0xff, 1);
- MD5Update(&ctx, config->l2tpsecret, strlen(config->l2tpsecret));
- MD5Update(&ctx, vector, vec_len);
- MD5Final(digest, &ctx);
+ MD5_Init(&ctx);
+ MD5_Update(&ctx, (unsigned char *) &m, 2);
+ MD5_Update(&ctx, config->l2tpsecret, strlen(config->l2tpsecret));
+ MD5_Update(&ctx, vector, vec_len);
+ MD5_Final(digest, &ctx);
// pointer to last decoded 16 octets
last = value;
// calculate a new pad based on the last decoded block
if (d >= sizeof(digest))
{
- MD5Init(&ctx);
- MD5Update(&ctx, config->l2tpsecret, strlen(config->l2tpsecret));
- MD5Update(&ctx, last, sizeof(digest));
- MD5Final(digest, &ctx);
+ MD5_Init(&ctx);
+ MD5_Update(&ctx, config->l2tpsecret, strlen(config->l2tpsecret));
+ MD5_Update(&ctx, last, sizeof(digest));
+ MD5_Final(digest, &ctx);
d = 0;
last = value;
}
}
+int find_filter(char const *name, size_t len)
+{
+ int free = -1;
+ int i;
+
+ for (i = 0; i < MAXFILTER; i++)
+ {
+ if (!*ip_filters[i].name)
+ {
+ if (free < 0)
+ free = i;
+
+ continue;
+ }
+
+ if (strlen(ip_filters[i].name) != len)
+ continue;
+
+ if (!strncmp(ip_filters[i].name, name, len))
+ return i;
+ }
+
+ return free;
+}
+
static int ip_filter_port(ip_filter_portt *p, uint16_t port)
{
switch (p->op)
projects / l2tpns.git / blobdiff