// 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 1.175 2010/03/25 05:24:23 bodea Exp $";
+char const *cvs_id_l2tpns = "$Id: l2tpns.c,v 1.176 2011/01/20 12:48:40 bodea Exp $";
#include <arpa/inet.h>
#include <assert.h>
#include <sched.h>
#include <sys/sysinfo.h>
#include <libcli.h>
+#include <linux/netlink.h>
+#include <linux/rtnetlink.h>
#include "md5.h"
#include "l2tpns.h"
// Globals
configt *config = NULL; // all configuration
+int nlfd = -1; // netlink socket
int tunfd = -1; // tun interface file handle. (network device)
int udpfd = -1; // UDP file handle
int controlfd = -1; // Control signal handle
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
-int ifr6fd = -1; // File descriptor for IPv6 routing, etc
int rand_fd = -1; // Random data source
int cluster_sockfd = -1; // Intra-cluster communications socket.
int epollfd = -1; // event polling
time_t basetime = 0; // base clock
char hostname[1000] = ""; // us.
static int tunidx; // ifr_ifindex of tun device
+int nlseqnum = 0; // netlink sequence number
static int syslog_log = 0; // are we logging to syslog
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
return;
}
-// defined in linux/ipv6.h, but tricky to include from user-space
-// TODO: move routing to use netlink rather than ioctl
-struct in6_ifreq {
- struct in6_addr ifr6_addr;
- __u32 ifr6_prefixlen;
- unsigned int ifr6_ifindex;
-};
+//
+// Set up netlink socket
+static void initnetlink(void)
+{
+ struct sockaddr_nl nladdr;
+
+ nlfd = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
+ if (nlfd < 0)
+ {
+ LOG(0, 0, 0, "Can't create netlink socket: %s\n", strerror(errno));
+ exit(1);
+ }
+
+ memset(&nladdr, 0, sizeof(nladdr));
+ nladdr.nl_family = AF_NETLINK;
+ nladdr.nl_pid = getpid();
+
+ if (bind(nlfd, (struct sockaddr *)&nladdr, sizeof(nladdr)) < 0)
+ {
+ LOG(0, 0, 0, "Can't bind netlink socket: %s\n", strerror(errno));
+ exit(1);
+ }
+}
+
+static ssize_t netlink_send(struct nlmsghdr *nh, int want_ack)
+{
+ struct sockaddr_nl nladdr;
+ struct iovec iov;
+ struct msghdr msg;
+
+ nh->nlmsg_pid = getpid();
+ nh->nlmsg_seq = ++nlseqnum;
+ if (want_ack)
+ nh->nlmsg_flags |= NLM_F_ACK;
+
+ // set kernel address
+ memset(&nladdr, 0, sizeof(nladdr));
+ nladdr.nl_family = AF_NETLINK;
+
+ iov = (struct iovec){ (void *)nh, nh->nlmsg_len };
+ msg = (struct msghdr){ (void *)&nladdr, sizeof(nladdr), &iov, 1, NULL, 0, 0 };
+
+ return sendmsg(nlfd, &msg, 0);
+}
+
+static ssize_t netlink_recv(char *buf, ssize_t len)
+{
+ struct sockaddr_nl nladdr;
+ struct iovec iov;
+ struct msghdr msg;
+
+ // set kernel address
+ memset(&nladdr, 0, sizeof(nladdr));
+ nladdr.nl_family = AF_NETLINK;
+
+ iov = (struct iovec){ buf, len };
+ msg = (struct msghdr){ (void *)&nladdr, sizeof(nladdr), &iov, 1, NULL, 0, 0 };
+
+ return recvmsg(nlfd, &msg, 0);
+}
+
+static ssize_t netlink_check_ack(struct nlmsghdr *ack_nh, int msg_count)
+{
+ ssize_t len;
+ uint32_t seqnum;
+
+ // expect ack
+ for (; NLMSG_OK (ack_nh, len); ack_nh = NLMSG_NEXT (ack_nh, len))
+ {
+ if (ack_nh->nlmsg_type == NLMSG_DONE)
+ return msg_count != 0 || seqnum != nlseqnum;
+ // 1 => lost an ack
+
+ if (ack_nh->nlmsg_type == NLMSG_ERROR)
+ {
+ struct nlmsgerr *errmsg = NLMSG_DATA(ack_nh);
+ if (errmsg->error)
+ return errmsg->error; // got an error back
+ else
+ {
+ // ack received
+ --msg_count;
+ if (errmsg->msg.nlmsg_seq > seqnum);
+ seqnum = errmsg->msg.nlmsg_seq;
+ }
+ }
+ else
+ // unknown message
+ LOG(3, 0, 0, "Got an unknown netlink message: type %d\n", ack_nh->nlmsg_type);
+ }
+
+ return 1; // malformed message?!
+}
//
// Set up TUN interface
static void inittun(void)
{
+ struct ifinfomsg ifinfo;
struct ifreq ifr;
- struct in6_ifreq ifr6;
- struct sockaddr_in sin = {0};
+ char buf[4096];
+ struct nlmsghdr resp_nh;
+
memset(&ifr, 0, sizeof(ifr));
ifr.ifr_flags = IFF_TUN;
}
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;
- sin.sin_addr.s_addr = config->bind_address ? config->bind_address : 0x01010101; // 1.1.1.1
- memcpy(&ifr.ifr_addr, &sin, sizeof(struct sockaddr));
- if (ioctl(ifrfd, SIOCSIFADDR, (void *) &ifr) < 0)
{
- LOG(0, 0, 0, "Error setting tun address: %s\n", strerror(errno));
- exit(1);
- }
- /* Bump up the qlen to deal with bursts from the network */
- ifr.ifr_qlen = 1000;
- if (ioctl(ifrfd, SIOCSIFTXQLEN, (void *) &ifr) < 0)
- {
- 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)
- {
- LOG(0, 0, 0, "Error setting tun flags: %s\n", strerror(errno));
- exit(1);
- }
- if (ioctl(ifrfd, SIOCGIFINDEX, (void *) &ifr) < 0)
- {
- LOG(0, 0, 0, "Error getting tun ifindex: %s\n", strerror(errno));
- exit(1);
- }
- tunidx = ifr.ifr_ifindex;
+ // get the interface index
+ ssize_t len;
+ struct {
+ struct nlmsghdr nh;
+ struct ifinfomsg ifinfo __attribute__ ((aligned(NLMSG_ALIGNTO)));
+ struct rtattr ifname_rta __attribute__ ((aligned(RTA_ALIGNTO)));
+ char ifname[IFNAMSIZ];
+ } req;
- // Only setup IPv6 on the tun device if we have a configured prefix
- if (config->ipv6_prefix.s6_addr[0]) {
- ifr6fd = socket(PF_INET6, SOCK_DGRAM, 0);
+ req.nh.nlmsg_type = RTM_GETLINK;
+ req.nh.nlmsg_flags = NLM_F_REQUEST;
- // Link local address is FE80::1
- memset(&ifr6.ifr6_addr, 0, sizeof(ifr6.ifr6_addr));
- ifr6.ifr6_addr.s6_addr[0] = 0xFE;
- ifr6.ifr6_addr.s6_addr[1] = 0x80;
- ifr6.ifr6_addr.s6_addr[15] = 1;
- ifr6.ifr6_prefixlen = 64;
- ifr6.ifr6_ifindex = ifr.ifr_ifindex;
- if (ioctl(ifr6fd, SIOCSIFADDR, (void *) &ifr6) < 0)
+ req.ifinfo.ifi_family = AF_UNSPEC; // as the man says
+
+ req.ifname_rta.rta_len = RTA_LENGTH(strlen(config->tundevice)+1);
+ req.ifname_rta.rta_type = IFLA_IFNAME;
+ strncpy(req.ifname, config->tundevice, IFNAMSIZ-1);
+
+ if(netlink_send(&req.nh, 0) < 0 || (len = netlink_recv(buf, sizeof(buf))) < 0)
{
- LOG(0, 0, 0, "Error setting tun IPv6 link local address:"
- " %s\n", strerror(errno));
+ LOG(0, 0, 0, "Error getting tun ifindex: %s\n", strerror(errno));
+ exit(1);
}
- // Global address is prefix::1
- memset(&ifr6.ifr6_addr, 0, sizeof(ifr6.ifr6_addr));
- ifr6.ifr6_addr = config->ipv6_prefix;
- ifr6.ifr6_addr.s6_addr[15] = 1;
- ifr6.ifr6_prefixlen = 64;
- ifr6.ifr6_ifindex = ifr.ifr_ifindex;
- if (ioctl(ifr6fd, SIOCSIFADDR, (void *) &ifr6) < 0)
+ resp_nh = (struct nlmsghdr *)buf;
+ if (NLMSG_OK (resp_nh, len) && resp_nh.nlmsg_type == RTM_GETLINK)
{
- LOG(0, 0, 0, "Error setting tun IPv6 global address: %s\n",
- strerror(errno));
+ memcpy(&ifinfo, NLMSG_DATA(resp_nh), sizeof(ifinfo));
+ // got index
+ tunidx = ifinfo.ifi_index;
+ }
+ else
+ {
+ LOG(0, 0, 0, "Malformed answer getting tun ifindex\n");
+ exit(1);
+ }
+ }
+ {
+ ssize_t err;
+ struct {
+ // interface setting
+ struct nlmsghdr nh;
+ struct ifinfomsg ifinfo __attribute__ ((aligned(NLMSG_ALIGNTO)));
+ struct rtattr txqlen_rta __attribute__ ((aligned(RTA_ALIGNTO)));
+ uint32_t txqlen;
+ struct rtattr mtu_rta __attribute__ ((aligned(RTA_ALIGNTO)));
+ uint32_t mtu;
+
+ // IPv4 address
+ struct nlmsghdr addr_nh __attribute __ ((aligned(NLMSG_ALIGNTO)));
+ struct ifaddrmsg ifaddr __attribute __ ((aligned(NLMSG_ALIGNTO)));
+ struct rtattr addr_rta __attribute __ ((aligned(RTA_ALIGNTO)));
+ struct in_addr addr;
+
+ // IPv6 LL address
+ struct nlmsghdr lladdr6_nh __attribute __ ((aligned(NLMSG_ALIGNTO)));
+ struct ifaddrmsg llifaddr6 __attribute __ ((aligned(NLMSG_ALIGNTO)));
+ struct rtattr lladdr6_rta __attribute __ ((aligned(RTA_ALIGNTO)));
+ struct in6_addr lladdr6;
+
+ // IPv6 global address
+ struct nlmsghdr addr6_nh __attribute __ ((aligned(NLMSG_ALIGNTO)));
+ struct ifaddrmsg ifaddr6 __attribute __ ((aligned(NLMSG_ALIGNTO)));
+ struct rtattr addr6_rta __attribute __ ((aligned(RTA_ALIGNTO)));
+ struct in6_addr addr6;
+
+ // end header
+ struct nlmsghdr end_nh __attribute __ ((aligned(NLMSG_ALIGNTO)));
+ } req;
+ char buf[4096];
+
+ memset(&req, 0, sizeof(req));
+
+ req.nh.nlmsg_type = RTM_NEWLINK;
+ req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_REPLACE | NLM_F_MULTI;
+
+ req.ifinfo = ifinfo;
+ req.ifinfo.ifi_flags |= IFF_UP; // set interface up
+ req.ifinfo.ifi_change = IFF_UP; // only change this flag
+
+ req.txqlen_rta.rta_len = RTA_LENGTH(sizeof(req.txqlen));
+ req.txqlen_rta.rta_type = IFLA_TXQLEN;
+ /* Bump up the qlen to deal with bursts from the network */
+ req.txqlen = 1000;
+
+ req.mtu_rta.rta_len = RTA_LENGTH(sizeof(req.txqlen));
+ req.mtu_rta.rta_type = IFLA_MTU;
+ /* set MTU to modem MRU */
+ req.mtu = MRU;
+
+ req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifinfo)
+ + req.txqlen_rla.rta_len
+ + req.mtu_rta.rta_len);
+
+ req.addr_nh.nlmsg_type = RTM_NEWADDR;
+ req.addr_nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_MULTI;
+
+ req.ifaddr.ifa_family = AF_INET;
+ req.ifaddr.ifa_prefixlen = 32;
+ req.ifaddr.ifa_index = ifinfo.ifi_index;
+
+ req.addr_rta.rta_len = RTA_LENGTH(sizeof(req.addr));
+ req.addr_rta.rta_type = IFA_ADDRESS;
+ req.addr.s_addr = config->bind_address ?
+ config->bind_address : 0x01010101; // 1.1.1.1
+
+ req.addr_nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifaddr)
+ + req.addr_rta.rta_len);
+
+ // Only setup IPv6 on the tun device if we have a configured prefix
+ if (config->ipv6_prefix.s6_addr[0]) {
+ req.lladdr6_nh.nlmsg_type = RTM_NEWADDR;
+ req.lladdr6_nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_MULTI;
+
+ req.llifaddr6.ifa_family = AF_INET6;
+ req.llifaddr6.ifa_prefixlen = 64;
+ req.llifaddr6.ifa_scope = RT_SCOPE_LINK;
+ req.llifaddr6.ifa_index = ifinfo.ifi_index;
+
+ req.lladdr6_rta.rta_len = RTA_LENGTH(sizeof(req.lladdr6));
+ req.lladdr6_rta.rta_type = IFA_LOCAL;
+ // Link local address is FE80::1
+ memset(&req.lladdr6, 0, sizeof(req.lladdr6));
+ req.lladdr6.s6_addr[0] = 0xFE;
+ req.lladdr6.s6_addr[1] = 0x80;
+ req.lladdr6.s6_addr[15] = 1;
+
+ req.lladdr6_nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifaddr)
+ + req.lladdr6_rta.rta_len);
+
+ req.addr6_nh.nlmsg_type = RTM_NEWADDR;
+ req.addr6_nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_MULTI;
+
+ req.ifaddr6.ifa_family = AF_INET6;
+ req.ifaddr6.ifa_prefixlen = 64;
+ req.ifaddr6.ifa_scope = RT_SCOPE_UNIVERSE;
+ req.ifaddr6.ifa_index = ifinfo.ifi_index;
+
+ req.addr6_rta.rta_len = RTA_LENGTH(sizeof(req.addr6));
+ req.addr6_rta.rta_type = IFA_LOCAL;
+ // Global address is prefix::1
+ req.addr6 = config->ipv6_prefix;
+ req.addr6.s6_addr[15] = 1;
+
+ req.lladdr6_nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifaddr)
+ + req.lladdr6_rta.rta_len);
+
+ req.end_nh.nlmsg_type = NLMSG_DONE;
+ req.end_nh.nlmsg_len = NLMSG_LENGTH(0);
+ }
+ else
+ {
+ // we terminate at the beginning of IPv6 stuff
+ req.lladdr6_nh.nlmsg_type = NLMSG_DONE;
+ req.lladdr6_nh.nlmsg_len = NLMSG_LENGTH(0);
+ }
+
+ if (netlink_send(&req.nh, 1) < 0)
+ LOG(0, 0, 0, "Error setting up tun device: %s\n", strerror(errno));
+ exit(1);
+ }
+
+ if (netlink_recv(buf, sizeof(buf)) < 0)
+ {
+ LOG(0, 0, 0, "Error waiting ack for setting up tun device: %s\n", strerror(errno));
+ exit(1);
+ }
+
+ resp_nh = (struct nlmsghdr *)buf;
+ if ((err = netlink_check_ack(resp_nh, 4)))
+ {
+ if (err < 0)
+ LOG(0, 0, 0, "Error while receiving tun device ack: %s\n", strerror(errno));
+ else
+ LOG(0, 0, 0, "Error while receiving tun device ack\n", strerror(errno));
+ exit(1);
}
}
}
if (tunnel[t].retry <= TIME)
{
controlt *c = tunnel[t].controls;
- uint8_t w = tunnel[t].window;
+ uint16_t w = tunnel[t].window;
tunnel[t].try++; // another try
if (tunnel[t].try > 5)
tunnelkill(t, "Timeout on control message"); // game over
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