Make routset()/route6set() use netlink.

[l2tpns.git] / l2tpns.c

diff --git a/l2tpns.c b/l2tpns.c
index 8e3f762..110029a 100644 (file)
--- a/l2tpns.c
+++ b/l2tpns.c
@@ -4,7 +4,7 @@
 // Copyright (c) 2002 FireBrick (Andrews & Arnold Ltd / Watchfront Ltd) - GPL licenced
 // vim: sw=8 ts=8
 
 // 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 1.174 2010/01/09 13:33:41 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 <arpa/inet.h>
 #include <assert.h>


@@ -39,6 +39,8 @@ char const *cvs_id_l2tpns = "$Id: l2tpns.c,v 1.174 2010/01/09 13:33:41 bodea Exp
 #include <sched.h>
 #include <sys/sysinfo.h>
 #include <libcli.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"
 
 #include "md5.h"
 #include "l2tpns.h"


@@ -56,6 +58,7 @@ char const *cvs_id_l2tpns = "$Id: l2tpns.c,v 1.174 2010/01/09 13:33:41 bodea Exp
 
 // Globals
 configt *config = NULL;                // all configuration
 
 // 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 tunfd = -1;                        // tun interface file handle. (network device)
 int udpfd = -1;                        // UDP file handle
 int controlfd = -1;            // Control signal handle


@@ -63,14 +66,14 @@ 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 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 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
+int min_initok_nlseqnum = 0;   // minimun seq number for messages after init is ok

 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
 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


@@ -197,6 +200,8 @@ struct Tstats *_statistics = NULL;
 struct Tringbuffer *ringbuffer = NULL;
 #endif
 
 struct Tringbuffer *ringbuffer = NULL;
 #endif
 

+static ssize_t netlink_send(struct nlmsghdr *nh);
+static void netlink_addattr(struct nlmsghdr *nh, int type, const void *data, int alen);

 static void cache_ipmap(in_addr_t ip, sessionidt s);
 static void uncache_ipmap(in_addr_t ip);
 static void cache_ipv6map(struct in6_addr ip, int prefixlen, sessionidt s);
 static void cache_ipmap(in_addr_t ip, sessionidt s);
 static void uncache_ipmap(in_addr_t ip);
 static void cache_ipv6map(struct in6_addr ip, int prefixlen, sessionidt s);


@@ -416,43 +421,61 @@ void random_data(uint8_t *buf, int len)
 // via BGP if enabled, and stuffs it into the
 // 'sessionbyip' cache.
 //
 // via BGP if enabled, and stuffs it into the
 // 'sessionbyip' cache.
 //

-// 'ip' and 'mask' must be in _host_ order.
+// 'ip' must be in _host_ order.

 //
 //

-static void routeset(sessionidt s, in_addr_t ip, in_addr_t mask, in_addr_t gw, int add)
+static void routeset(sessionidt s, in_addr_t ip, int prefixlen, in_addr_t gw, int add)

 {
 {

-       struct rtentry r;
+       struct {
+               struct nlmsghdr nh;
+               struct rtmsg rt;
+               char buf[32];
+       } req;

        int i;
        int i;

+       in_addr_t n_ip;

 
 

-       if (!mask) mask = 0xffffffff;
+       if (!prefixlen) prefixlen = 32;

 
 

-       ip &= mask;             // Force the ip to be the first one in the route.
+       ip &= 0xffffffff << (32 - prefixlen);;  // Force the ip to be the first one in the route.

 
 

-       memset(&r, 0, sizeof(r));
-       r.rt_dev = config->tundevice;
-       r.rt_dst.sa_family = AF_INET;
-       *(uint32_t *) & (((struct sockaddr_in *) &r.rt_dst)->sin_addr.s_addr) = htonl(ip);
-       r.rt_gateway.sa_family = AF_INET;
-       *(uint32_t *) & (((struct sockaddr_in *) &r.rt_gateway)->sin_addr.s_addr) = htonl(gw);
-       r.rt_genmask.sa_family = AF_INET;
-       *(uint32_t *) & (((struct sockaddr_in *) &r.rt_genmask)->sin_addr.s_addr) = htonl(mask);
-       r.rt_flags = (RTF_UP | RTF_STATIC);
+       memset(&req, 0, sizeof(req));
+
+       if (add)
+       {
+               req.nh.nlmsg_type = RTM_NEWROUTE;
+               req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_REPLACE;
+       }
+       else
+               req.nh.nlmsg_type = RTM_DELROUTE;
+       req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.rt));
+
+       req.rt.rtm_family = AF_INET;
+       req.rt.rtm_dst_len = prefixlen;
+       req.rt.rtm_table = RT_TABLE_MAIN;
+       req.rt.rtm_protocol = RTPROT_BOOT; // XXX
+       req.rt.rtm_scope = RT_SCOPE_LINK;
+       req.rt.rtm_type = RTN_UNICAST;
+
+       netlink_addattr(&req.nh, RTA_OIF, &tunidx, sizeof(int));
+       n_ip = htonl(ip);
+       netlink_addattr(&req.nh, RTA_DST, &n_ip, sizeof(n_ip));

        if (gw)
        if (gw)

-               r.rt_flags |= RTF_GATEWAY;
-       else if (mask == 0xffffffff)
-               r.rt_flags |= RTF_HOST;
+       {
+               n_ip = htonl(gw);
+               netlink_addattr(&req.nh, RTA_GATEWAY, &n_ip, sizeof(n_ip));
+       }

 
 

-       LOG(1, s, 0, "Route %s %s/%s%s%s\n", add ? "add" : "del",
-           fmtaddr(htonl(ip), 0), fmtaddr(htonl(mask), 1),
+       LOG(1, s, 0, "Route %s %s/%d%s%s\n", add ? "add" : "del",
+           fmtaddr(htonl(ip), 0), prefixlen,

            gw ? " via" : "", gw ? fmtaddr(htonl(gw), 2) : "");
 
            gw ? " via" : "", gw ? fmtaddr(htonl(gw), 2) : "");
 

-       if (ioctl(ifrfd, add ? SIOCADDRT : SIOCDELRT, (void *) &r) < 0)
-               LOG(0, 0, 0, "routeset() error in ioctl: %s\n", strerror(errno));
+       if (netlink_send(&req.nh) < 0)
+               LOG(0, 0, 0, "routeset() error in sending netlink message: %s\n", strerror(errno));

 
 #ifdef BGP
        if (add)
 
 #ifdef BGP
        if (add)

-               bgp_add_route(htonl(ip), htonl(mask));
+               bgp_add_route(htonl(ip), prefixlen);

        else
        else

-               bgp_del_route(htonl(ip), htonl(mask));
+               bgp_del_route(htonl(ip), prefixlen);

 #endif /* BGP */
 
                // Add/Remove the IPs to the 'sessionbyip' cache.
 #endif /* BGP */
 
                // Add/Remove the IPs to the 'sessionbyip' cache.


@@ -468,38 +491,57 @@ static void routeset(sessionidt s, in_addr_t ip, in_addr_t mask, in_addr_t gw, i
                if (!add)       // Are we deleting a route?
                        s = 0;  // Caching the session as '0' is the same as uncaching.
 
                if (!add)       // Are we deleting a route?
                        s = 0;  // Caching the session as '0' is the same as uncaching.
 

-               for (i = ip; (i&mask) == (ip&mask) ; ++i)
+               for (i = ip; i < ip+(1<<(32-prefixlen)) ; ++i)

                        cache_ipmap(i, s);
        }
 }
 
 void route6set(sessionidt s, struct in6_addr ip, int prefixlen, int add)
 {
                        cache_ipmap(i, s);
        }
 }
 
 void route6set(sessionidt s, struct in6_addr ip, int prefixlen, int add)
 {

-       struct in6_rtmsg rt;
+       struct {
+               struct nlmsghdr nh;
+               struct rtmsg rt;
+               char buf[64];
+       } req;
+       int metric;

        char ipv6addr[INET6_ADDRSTRLEN];
 
        char ipv6addr[INET6_ADDRSTRLEN];
 

-       if (ifr6fd < 0)
+       if (!config->ipv6_prefix.s6_addr[0])

        {
                LOG(0, 0, 0, "Asked to set IPv6 route, but IPv6 not setup.\n");
                return;
        }
 
        {
                LOG(0, 0, 0, "Asked to set IPv6 route, but IPv6 not setup.\n");
                return;
        }
 

-       memset(&rt, 0, sizeof(rt));
+       memset(&req, 0, sizeof(req));

 
 

-       memcpy(&rt.rtmsg_dst, &ip, sizeof(struct in6_addr));
-       rt.rtmsg_dst_len = prefixlen;
-       rt.rtmsg_metric = 1;
-       rt.rtmsg_flags = RTF_UP;
-       rt.rtmsg_ifindex = tunidx;
+       if (add)
+       {
+               req.nh.nlmsg_type = RTM_NEWROUTE;
+               req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_REPLACE;
+       }
+       else
+               req.nh.nlmsg_type = RTM_DELROUTE;
+       req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.rt));
+
+       req.rt.rtm_family = AF_INET6;
+       req.rt.rtm_dst_len = prefixlen;
+       req.rt.rtm_table = RT_TABLE_MAIN;
+       req.rt.rtm_protocol = RTPROT_BOOT; // XXX
+       req.rt.rtm_scope = RT_SCOPE_LINK;
+       req.rt.rtm_type = RTN_UNICAST;
+
+       netlink_addattr(&req.nh, RTA_OIF, &tunidx, sizeof(int));
+       netlink_addattr(&req.nh, RTA_DST, &ip, sizeof(ip));
+       metric = 1;
+       netlink_addattr(&req.nh, RTA_METRICS, &metric, sizeof(metric));

 
        LOG(1, 0, 0, "Route %s %s/%d\n",
            add ? "add" : "del",
            inet_ntop(AF_INET6, &ip, ipv6addr, INET6_ADDRSTRLEN),
            prefixlen);
 
 
        LOG(1, 0, 0, "Route %s %s/%d\n",
            add ? "add" : "del",
            inet_ntop(AF_INET6, &ip, ipv6addr, INET6_ADDRSTRLEN),
            prefixlen);
 

-       if (ioctl(ifr6fd, add ? SIOCADDRT : SIOCDELRT, (void *) &rt) < 0)
-               LOG(0, 0, 0, "route6set() error in ioctl: %s\n",
-                               strerror(errno));
+       if (netlink_send(&req.nh) < 0)
+               LOG(0, 0, 0, "route6set() error in sending netlink message: %s\n", strerror(errno));

 
        // FIXME: need to add BGP routing (RFC2858)
 
 
        // FIXME: need to add BGP routing (RFC2858)
 


@@ -514,21 +556,95 @@ void route6set(sessionidt s, struct in6_addr ip, int prefixlen, int add)
        return;
 }
 
        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)
+{
+       struct sockaddr_nl nladdr;
+       struct iovec iov;
+       struct msghdr msg;
+
+       nh->nlmsg_pid = getpid();
+       nh->nlmsg_seq = ++nlseqnum;
+
+       // 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(void *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);
+}
+
+/* adapted from iproute2 */
+static void netlink_addattr(struct nlmsghdr *nh, int type, const void *data, int alen)
+{
+       int len = RTA_LENGTH(alen);
+       struct rtattr *rta;
+
+       rta = (struct rtattr *)(((void *)nh) + NLMSG_ALIGN(nh->nlmsg_len));
+       rta->rta_type = type;
+       rta->rta_len = len;
+       memcpy(RTA_DATA(rta), data, alen);
+       nh->nlmsg_len = NLMSG_ALIGN(nh->nlmsg_len) + RTA_ALIGN(len);
+}
+
+// messages corresponding to different phases seq number
+static char *tun_nl_phase_msg[] = {
+       "initialized",
+       "getting tun interface index",
+       "setting tun interface parameters",
+       "setting tun IPv4 address",
+       "setting tun LL IPv6 address",
+       "setting tun global IPv6 address",

 };
 
 //
 // Set up TUN interface
 static void inittun(void)
 {
 };
 
 //
 // Set up TUN interface
 static void inittun(void)
 {

+       struct ifinfomsg ifinfo;

        struct ifreq ifr;
        struct ifreq ifr;

-       struct in6_ifreq ifr6;
-       struct sockaddr_in sin = {0};
+

        memset(&ifr, 0, sizeof(ifr));
        ifr.ifr_flags = IFF_TUN;
 
        memset(&ifr, 0, sizeof(ifr));
        ifr.ifr_flags = IFF_TUN;
 


@@ -547,75 +663,162 @@ static void inittun(void)
                LOG(0, 0, 0, "Can't set tun interface: %s\n", strerror(errno));
                exit(1);
        }
                LOG(0, 0, 0, "Can't set tun interface: %s\n", strerror(errno));
                exit(1);
        }

-       assert(strlen(ifr.ifr_name) < sizeof(config->tundevice));
-       strncpy(config->tundevice, ifr.ifr_name, sizeof(config->tundevice) - 1);
-       ifrfd = socket(PF_INET, SOCK_DGRAM, IPPROTO_IP);
-
-       sin.sin_family = AF_INET;
-       sin.sin_addr.s_addr = config->bind_address ? config->bind_address : 0x01010101; // 1.1.1.1
-       memcpy(&ifr.ifr_addr, &sin, sizeof(struct sockaddr));
+       assert(strlen(ifr.ifr_name) < sizeof(config->tundevice) - 1);
+       strncpy(config->tundevice, ifr.ifr_name, sizeof(config->tundevice));

 
 

-       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
+               struct {
+                       struct nlmsghdr nh;
+                       struct ifinfomsg ifinfo;
+               } req;
+               char buf[4096];
+               ssize_t len;
+               struct nlmsghdr *resp_nh;
+
+               req.nh.nlmsg_type = RTM_GETLINK;
+               req.nh.nlmsg_flags = NLM_F_REQUEST;
+               req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifinfo));

 
 

-       // 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.ifinfo.ifi_family = AF_UNSPEC; // as the man says

 
 

-               // 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)
+               netlink_addattr(&req.nh, IFLA_IFNAME, config->tundevice, strlen(config->tundevice)+1);
+
+               if(netlink_send(&req.nh) < 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))

                {
                {

-                       LOG(0, 0, 0, "Error setting tun IPv6 global address: %s\n",
-                               strerror(errno));
+                       LOG(0, 0, 0, "Malformed answer getting tun ifindex %ld\n", len);
+                       exit(1);
+               }
+
+               memcpy(&ifinfo, NLMSG_DATA(resp_nh), sizeof(ifinfo));
+               // got index
+               tunidx = ifinfo.ifi_index;
+       }
+       {
+               struct {
+                       // interface setting
+                       struct nlmsghdr nh;
+                       union {
+                               struct ifinfomsg ifinfo;
+                               struct ifaddrmsg ifaddr;
+                       } ifmsg;
+                       char rtdata[32]; // 32 should be enough
+               } req;
+               uint32_t txqlen, mtu;
+               struct in_addr ip;
+
+               memset(&req, 0, sizeof(req));
+
+               req.nh.nlmsg_type = RTM_SETLINK;
+               req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_MULTI;
+               req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifmsg.ifinfo));
+
+               req.ifmsg.ifinfo = ifinfo;
+               req.ifmsg.ifinfo.ifi_flags |= IFF_UP; // set interface up
+               req.ifmsg.ifinfo.ifi_change = IFF_UP; // only change this flag
+
+               /* Bump up the qlen to deal with bursts from the network */
+               txqlen = 1000;
+               netlink_addattr(&req.nh, IFLA_TXQLEN, &txqlen, sizeof(txqlen));
+               /* set MTU to modem MRU */
+               mtu = MRU;
+               netlink_addattr(&req.nh, IFLA_MTU, &mtu, sizeof(mtu));
+
+               if (netlink_send(&req.nh) < 0)
+                       goto senderror;
+
+               memset(&req, 0, sizeof(req));
+
+               req.nh.nlmsg_type = RTM_NEWADDR;
+               req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_MULTI;
+               req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifmsg.ifaddr));
+
+               req.ifmsg.ifaddr.ifa_family = AF_INET;
+               req.ifmsg.ifaddr.ifa_prefixlen = 32;
+               req.ifmsg.ifaddr.ifa_index = ifinfo.ifi_index;
+
+               if (config->bind_address)
+                       ip.s_addr = config->bind_address;
+               else
+                       ip.s_addr = 0x01010101, // 1.1.1.1
+               netlink_addattr(&req.nh, IFA_LOCAL, &ip, sizeof(ip));
+
+               if (netlink_send(&req.nh) < 0)
+                       goto senderror;
+
+               // Only setup IPv6 on the tun device if we have a configured prefix
+               if (config->ipv6_prefix.s6_addr[0]) {
+                       struct in6_addr ip6;
+
+                       memset(&req, 0, sizeof(req));
+
+                       req.nh.nlmsg_type = RTM_NEWADDR;
+                       req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_MULTI;
+                       req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifmsg.ifaddr));
+
+                       req.ifmsg.ifaddr.ifa_family = AF_INET6;
+                       req.ifmsg.ifaddr.ifa_prefixlen = 64;
+                       req.ifmsg.ifaddr.ifa_scope = RT_SCOPE_LINK;
+                       req.ifmsg.ifaddr.ifa_index = ifinfo.ifi_index;
+
+                       // Link local address is FE80::1
+                       memset(&ip6, 0, sizeof(ip6));
+                       ip6.s6_addr[0] = 0xFE;
+                       ip6.s6_addr[1] = 0x80;
+                       ip6.s6_addr[15] = 1;
+                       netlink_addattr(&req.nh, IFA_LOCAL, &ip6, sizeof(ip6));
+
+                       if (netlink_send(&req.nh) < 0)
+                               goto senderror;
+
+                       memset(&req, 0, sizeof(req));
+
+                       req.nh.nlmsg_type = RTM_NEWADDR;
+                       req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_MULTI;
+                       req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifmsg.ifaddr));
+
+                       req.ifmsg.ifaddr.ifa_family = AF_INET6;
+                       req.ifmsg.ifaddr.ifa_prefixlen = 64;
+                       req.ifmsg.ifaddr.ifa_scope = RT_SCOPE_UNIVERSE;
+                       req.ifmsg.ifaddr.ifa_index = ifinfo.ifi_index;
+
+                       // Global address is prefix::1
+                       ip6 = config->ipv6_prefix;
+                       ip6.s6_addr[15] = 1;
+                       netlink_addattr(&req.nh, IFA_LOCAL, &ip6, sizeof(ip6));
+
+                       if (netlink_send(&req.nh) < 0)
+                               goto senderror;

                }
                }

+
+               memset(&req, 0, sizeof(req));
+
+               req.nh.nlmsg_type = NLMSG_DONE;
+               req.nh.nlmsg_len = NLMSG_LENGTH(0);
+
+               if (netlink_send(&req.nh) < 0)
+                       goto senderror;
+
+               // if we get an error for seqnum < min_initok_nlseqnum,
+               // we must exit as initialization went wrong
+               if (config->ipv6_prefix.s6_addr[0])
+                       min_initok_nlseqnum = 5 + 1; // idx + if + addr + 2*addr6
+               else
+                       min_initok_nlseqnum = 3 + 1; // idx + if + addr

        }
        }

+
+       return;
+
+senderror:
+       LOG(0, 0, 0, "Error while setting up tun device: %s\n", strerror(errno));
+       exit(1);

 }
 
 // set up UDP ports
 }
 
 // set up UDP ports


@@ -1761,11 +1964,11 @@ void sessionshutdown(sessionidt s, char const *reason, int cdn_result, int cdn_e
                int routed = 0;
                for (r = 0; r < MAXROUTE && session[s].route[r].ip; r++)
                {
                int routed = 0;
                for (r = 0; r < MAXROUTE && session[s].route[r].ip; r++)
                {

-                       if ((session[s].ip & session[s].route[r].mask) ==
-                           (session[s].route[r].ip & session[s].route[r].mask))
+                       if ((session[s].ip >> (32-session[s].route[r].prefixlen)) ==
+                           (session[s].route[r].ip >> (32-session[s].route[r].prefixlen)))

                                routed++;
 
                                routed++;
 

-                       if (del_routes) routeset(s, session[s].route[r].ip, session[s].route[r].mask, 0, 0);
+                       if (del_routes) routeset(s, session[s].route[r].ip, session[s].route[r].prefixlen, 0, 0);

                        session[s].route[r].ip = 0;
                }
 
                        session[s].route[r].ip = 0;
                }
 


@@ -2686,9 +2889,11 @@ void processudp(uint8_t *buf, int len, struct sockaddr_in *addr)
                                        break;
                                case 2:       // SCCRP
                                        tunnel[t].state = TUNNELOPEN;
                                        break;
                                case 2:       // SCCRP
                                        tunnel[t].state = TUNNELOPEN;

+                                       tunnel[t].lastrec = time_now;

                                        break;
                                case 3:       // SCCN
                                        tunnel[t].state = TUNNELOPEN;
                                        break;
                                case 3:       // SCCN
                                        tunnel[t].state = TUNNELOPEN;

+                                       tunnel[t].lastrec = time_now;

                                        controlnull(t); // ack
                                        break;
                                case 4:       // StopCCN
                                        controlnull(t); // ack
                                        break;
                                case 4:       // StopCCN


@@ -3031,7 +3236,7 @@ static void regular_cleanups(double period)
                        if (tunnel[t].retry <= TIME)
                        {
                                controlt *c = tunnel[t].controls;
                        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
                                tunnel[t].try++; // another try
                                if (tunnel[t].try > 5)
                                        tunnelkill(t, "Timeout on control message"); // game over


@@ -3489,8 +3694,8 @@ static int still_busy(void)
 # include "fake_epoll.h"
 #endif
 
 # include "fake_epoll.h"
 #endif
 

-// the base set of fds polled: cli, cluster, tun, udp, control, dae
-#define BASE_FDS       6
+// the base set of fds polled: cli, cluster, tun, udp, control, dae, netlink
+#define BASE_FDS       7

 
 // additional polled fds
 #ifdef BGP
 
 // additional polled fds
 #ifdef BGP


@@ -3514,8 +3719,8 @@ static void mainloop(void)
                exit(1);
        }
 
                exit(1);
        }
 

-       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);
+       LOG(4, 0, 0, "Beginning of main loop.  clifd=%d, cluster_sockfd=%d, tunfd=%d, udpfd=%d, controlfd=%d, daefd=%d, nlfd=%d\n",
+               clifd, cluster_sockfd, tunfd, udpfd, controlfd, daefd, nlfd);

 
        /* setup our fds to poll for input */
        {
 
        /* setup our fds to poll for input */
        {


@@ -3551,6 +3756,10 @@ static void mainloop(void)
                d[i].type = FD_TYPE_DAE;
                e.data.ptr = &d[i++];
                epoll_ctl(epollfd, EPOLL_CTL_ADD, daefd, &e);
                d[i].type = FD_TYPE_DAE;
                e.data.ptr = &d[i++];
                epoll_ctl(epollfd, EPOLL_CTL_ADD, daefd, &e);

+
+               d[i].type = FD_TYPE_NETLINK;
+               e.data.ptr = &d[i++];
+               epoll_ctl(epollfd, EPOLL_CTL_ADD, nlfd, &e);

        }
 
 #ifdef BGP
        }
 
 #ifdef BGP


@@ -3687,6 +3896,32 @@ static void mainloop(void)
                                        break;
 #endif /* BGP */
 
                                        break;
 #endif /* BGP */
 

+                               case FD_TYPE_NETLINK:
+                               {
+                                       struct nlmsghdr *nh = (struct nlmsghdr *)buf;
+                                       s = netlink_recv(buf, sizeof(buf));
+                                       if (nh->nlmsg_type == NLMSG_ERROR)
+                                       {
+                                               struct nlmsgerr *errmsg = NLMSG_DATA(nh);
+                                               if (errmsg->error)
+                                               {
+                                                       if (errmsg->msg.nlmsg_seq < min_initok_nlseqnum)
+                                                       {
+                                                               LOG(0, 0, 0, "Got a fatal netlink error (while %s): %s\n", tun_nl_phase_msg[nh->nlmsg_seq], strerror(-errmsg->error));
+                                                               exit(1);
+                                                       }
+                                                       else
+
+                                                               LOG(0, 0, 0, "Got a netlink error: %s\n", strerror(-errmsg->error));
+                                               }
+                                               // else it's a ack
+                                       }
+                                       else
+                                               LOG(1, 0, 0, "Got a unknown netlink message: type %d seq %d flags %d\n", nh->nlmsg_type, nh->nlmsg_seq, nh->nlmsg_flags);
+                                       n--;
+                                       break;
+                               }
+

                                default:
                                        LOG(0, 0, 0, "Unexpected fd type returned from epoll_wait: %d\n", d->type);
                                }
                                default:
                                        LOG(0, 0, 0, "Unexpected fd type returned from epoll_wait: %d\n", d->type);
                                }


@@ -4245,18 +4480,18 @@ static void fix_address_pool(int sid)
 //
 // Add a block of addresses to the IP pool to hand out.
 //
 //
 // Add a block of addresses to the IP pool to hand out.
 //

-static void add_to_ip_pool(in_addr_t addr, in_addr_t mask)
+static void add_to_ip_pool(in_addr_t addr, int prefixlen)

 {
        int i;
 {
        int i;

-       if (mask == 0)
-               mask = 0xffffffff;      // Host route only.
+       if (prefixlen == 0)
+               prefixlen = 32;         // Host route only.

 
 

-       addr &= mask;
+       addr &= 0xffffffff << (32 - prefixlen);

 
        if (ip_pool_size >= MAXIPPOOL)  // Pool is full!
                return ;
 
 
        if (ip_pool_size >= MAXIPPOOL)  // Pool is full!
                return ;
 

-       for (i = addr ;(i & mask) == addr; ++i)
+       for (i = addr ; i < addr+(1<<(32-prefixlen)); ++i)

        {
                if ((i & 0xff) == 0 || (i&0xff) == 255)
                        continue;       // Skip 0 and broadcast addresses.
        {
                if ((i & 0xff) == 0 || (i&0xff) == 255)
                        continue;       // Skip 0 and broadcast addresses.


@@ -4314,7 +4549,7 @@ static void initippool()
                {
                        // It's a range
                        int numbits = 0;
                {
                        // It's a range
                        int numbits = 0;

-                       in_addr_t start = 0, mask = 0;
+                       in_addr_t start = 0;

 
                        LOG(2, 0, 0, "Adding IP address range %s\n", buf);
                        *p++ = 0;
 
                        LOG(2, 0, 0, "Adding IP address range %s\n", buf);
                        *p++ = 0;


@@ -4324,15 +4559,14 @@ static void initippool()
                                continue;
                        }
                        start = ntohl(inet_addr(pool));
                                continue;
                        }
                        start = ntohl(inet_addr(pool));

-                       mask = (in_addr_t) (pow(2, numbits) - 1) << (32 - numbits);

 
                        // Add a static route for this pool
 
                        // Add a static route for this pool

-                       LOG(5, 0, 0, "Adding route for address pool %s/%u\n",
-                               fmtaddr(htonl(start), 0), 32 + mask);
+                       LOG(5, 0, 0, "Adding route for address pool %s/%d\n",
+                               fmtaddr(htonl(start), 0), numbits);

 
 

-                       routeset(0, start, mask, 0, 1);
+                       routeset(0, start, numbits, 0, 1);

 
 

-                       add_to_ip_pool(start, mask);
+                       add_to_ip_pool(start, numbits);

                }
                else
                {
                }
                else
                {


@@ -4528,6 +4762,8 @@ int main(int argc, char *argv[])
                }
        }
 
                }
        }
 

+       initnetlink();
+

        /* Set up the cluster communications port. */
        if (cluster_init() < 0)
                exit(1);
        /* Set up the cluster communications port. */
        if (cluster_init() < 0)
                exit(1);


@@ -4979,11 +5215,11 @@ int sessionsetup(sessionidt s, tunnelidt t)
                // Add the route for this session.
                for (r = 0; r < MAXROUTE && session[s].route[r].ip; r++)
                {
                // Add the route for this session.
                for (r = 0; r < MAXROUTE && session[s].route[r].ip; r++)
                {

-                       if ((session[s].ip & session[s].route[r].mask) ==
-                           (session[s].route[r].ip & session[s].route[r].mask))
+                       if ((session[s].ip >> (32-session[s].route[r].prefixlen)) ==
+                           (session[s].route[r].ip >> (32-session[s].route[r].prefixlen)))

                                routed++;
 
                                routed++;
 

-                       routeset(s, session[s].route[r].ip, session[s].route[r].mask, 0, 1);
+                       routeset(s, session[s].route[r].ip, session[s].route[r].prefixlen, 0, 1);

                }
 
                // Static IPs need to be routed if not already
                }
 
                // Static IPs need to be routed if not already


@@ -5054,7 +5290,7 @@ int load_session(sessionidt s, sessiont *new)
 
        for (i = 0; !newip && i < MAXROUTE && (session[s].route[i].ip || new->route[i].ip); i++)
                if (new->route[i].ip != session[s].route[i].ip ||
 
        for (i = 0; !newip && i < MAXROUTE && (session[s].route[i].ip || new->route[i].ip); i++)
                if (new->route[i].ip != session[s].route[i].ip ||

-                   new->route[i].mask != session[s].route[i].mask)
+                   new->route[i].prefixlen != session[s].route[i].prefixlen)

                        newip++;
 
        // needs update
                        newip++;
 
        // needs update


@@ -5065,11 +5301,11 @@ int load_session(sessionidt s, sessiont *new)
                // remove old routes...
                for (i = 0; i < MAXROUTE && session[s].route[i].ip; i++)
                {
                // remove old routes...
                for (i = 0; i < MAXROUTE && session[s].route[i].ip; i++)
                {

-                       if ((session[s].ip & session[s].route[i].mask) ==
-                           (session[s].route[i].ip & session[s].route[i].mask))
+                       if ((session[s].ip >> (32-session[s].route[i].prefixlen)) ==
+                           (session[s].route[i].ip >> (32-session[s].route[i].prefixlen)))

                                routed++;
 
                                routed++;
 

-                       routeset(s, session[s].route[i].ip, session[s].route[i].mask, 0, 0);
+                       routeset(s, session[s].route[i].ip, session[s].route[i].prefixlen, 0, 0);

                }
 
                // ...ip
                }
 
                // ...ip


@@ -5088,11 +5324,11 @@ int load_session(sessionidt s, sessiont *new)
                // add new routes...
                for (i = 0; i < MAXROUTE && new->route[i].ip; i++)
                {
                // add new routes...
                for (i = 0; i < MAXROUTE && new->route[i].ip; i++)
                {

-                       if ((new->ip & new->route[i].mask) ==
-                           (new->route[i].ip & new->route[i].mask))
+                       if ((new->ip >> (32-new->route[i].prefixlen)) ==
+                           (new->route[i].ip >> (32-new->route[i].prefixlen)))

                                routed++;
 
                                routed++;
 

-                       routeset(s, new->route[i].ip, new->route[i].mask, 0, 1);
+                       routeset(s, new->route[i].ip, new->route[i].prefixlen, 0, 1);

                }
 
                // ...ip
                }
 
                // ...ip