Switch from masks to CIDR globally for IPv4.

[l2tpns.git] / l2tpns.c

diff --git a/l2tpns.c b/l2tpns.c
index d849711..f530955 100644 (file)
--- a/l2tpns.c
+++ b/l2tpns.c
@@ -73,6 +73,7 @@ time_t basetime = 0;          // base clock
 char hostname[1000] = "";      // us.
 static int tunidx;             // ifr_ifindex of tun device
 int nlseqnum = 0;              // netlink sequence number
 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


@@ -418,16 +419,19 @@ 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 rtentry r;

+       in_addr_t mask;

        int i;
 
        int i;
 

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

 
 

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

 
        memset(&r, 0, sizeof(r));
        r.rt_dev = config->tundevice;
 
        memset(&r, 0, sizeof(r));
        r.rt_dev = config->tundevice;


@@ -440,11 +444,11 @@ static void routeset(sessionidt s, in_addr_t ip, in_addr_t mask, in_addr_t gw, i
        r.rt_flags = (RTF_UP | RTF_STATIC);
        if (gw)
                r.rt_flags |= RTF_GATEWAY;
        r.rt_flags = (RTF_UP | RTF_STATIC);
        if (gw)
                r.rt_flags |= RTF_GATEWAY;

-       else if (mask == 0xffffffff)
+       else if (prefixlen == 32)

                r.rt_flags |= RTF_HOST;
 
                r.rt_flags |= RTF_HOST;
 

-       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) : "");
 
        if (ioctl(ifrfd, add ? SIOCADDRT : SIOCDELRT, (void *) &r) < 0)
            gw ? " via" : "", gw ? fmtaddr(htonl(gw), 2) : "");
 
        if (ioctl(ifrfd, add ? SIOCADDRT : SIOCDELRT, (void *) &r) < 0)


@@ -452,9 +456,9 @@ static void routeset(sessionidt s, in_addr_t ip, in_addr_t mask, in_addr_t gw, i
 
 #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.


@@ -470,7 +474,7 @@ 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);
        }
 }
                        cache_ipmap(i, s);
        }
 }


@@ -540,7 +544,7 @@ static void initnetlink(void)
        }
 }
 
        }
 }
 

-static ssize_t netlink_send(struct nlmsghdr *nh, int want_ack)
+static ssize_t netlink_send(struct nlmsghdr *nh)

 {
        struct sockaddr_nl nladdr;
        struct iovec iov;
 {
        struct sockaddr_nl nladdr;
        struct iovec iov;


@@ -548,8 +552,6 @@ static ssize_t netlink_send(struct nlmsghdr *nh, int want_ack)
 
        nh->nlmsg_pid = getpid();
        nh->nlmsg_seq = ++nlseqnum;
 
        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));
 
        // set kernel address
        memset(&nladdr, 0, sizeof(nladdr));


@@ -561,7 +563,7 @@ static ssize_t netlink_send(struct nlmsghdr *nh, int want_ack)
        return sendmsg(nlfd, &msg, 0);
 }
 
        return sendmsg(nlfd, &msg, 0);
 }
 

-static ssize_t netlink_recv(char *buf, ssize_t len)
+static ssize_t netlink_recv(void *buf, ssize_t len)

 {
        struct sockaddr_nl nladdr;
        struct iovec iov;
 {
        struct sockaddr_nl nladdr;
        struct iovec iov;


@@ -577,50 +579,35 @@ static ssize_t netlink_recv(char *buf, ssize_t len)
        return recvmsg(nlfd, &msg, 0);
 }
 
        return recvmsg(nlfd, &msg, 0);
 }
 

-static ssize_t netlink_check_ack(struct nlmsghdr *ack_nh, ssize_t len, int msg_count)
+/* adapted from iproute2 */
+void netlink_addattr(struct nlmsghdr *nh, int type, const void *data, int alen)

 {
 {

-       uint32_t seqnum = 0;
-
-       // 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;
-                               // if this is a single message, return now
-                               if (!(ack_nh->nlmsg_flags & NLM_F_MULTI))
-                                       return msg_count != 0 || seqnum != nlseqnum;
-                       }
-               }
-               else
-                       // unknown message
-                       LOG(3, 0, 0, "Got an unknown netlink message: type %d\n", ack_nh->nlmsg_type);
-       }
-
-       return 1; // malformed message?!
+       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)
 {
        struct ifinfomsg ifinfo;
        struct ifreq ifr;
 //
 // Set up TUN interface
 static void inittun(void)
 {
        struct ifinfomsg ifinfo;
        struct ifreq ifr;

-       char buf[4096];
-       ssize_t len;
-       struct nlmsghdr *resp_nh;

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


@@ -640,8 +627,8 @@ 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);
+       assert(strlen(ifr.ifr_name) < sizeof(config->tundevice) - 1);
+       strncpy(config->tundevice, ifr.ifr_name, sizeof(config->tundevice));

 
        {
                // get the interface index
 
        {
                // get the interface index


@@ -651,20 +638,19 @@ static void inittun(void)
                        struct rtattr ifname_rta __attribute__ ((aligned(RTA_ALIGNTO)));
                        char ifname[IFNAMSIZ];
                } req;
                        struct rtattr ifname_rta __attribute__ ((aligned(RTA_ALIGNTO)));
                        char ifname[IFNAMSIZ];
                } 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_type = RTM_GETLINK;
                req.nh.nlmsg_flags = NLM_F_REQUEST;

+               req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifinfo));

 
                req.ifinfo.ifi_family = AF_UNSPEC; // as the man says
 
 
                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);
+               netlink_addattr(&req.nh, IFLA_IFNAME, config->tundevice, strlen(config->tundevice)+1);

 
 

-               req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifinfo)
-                               + req.ifname_rta.rta_len);
-
-               if(netlink_send(&req.nh, 0) < 0 || (len = netlink_recv(buf, sizeof(buf))) < 0)
+               if(netlink_send(&req.nh) < 0 || (len = netlink_recv(buf, sizeof(buf))) < 0)

                {
                        LOG(0, 0, 0, "Error getting tun ifindex: %s\n", strerror(errno));
                        exit(1);
                {
                        LOG(0, 0, 0, "Error getting tun ifindex: %s\n", strerror(errno));
                        exit(1);


@@ -673,7 +659,7 @@ static void inittun(void)
                resp_nh = (struct nlmsghdr *)buf;
                if (!NLMSG_OK (resp_nh, len))
                {
                resp_nh = (struct nlmsghdr *)buf;
                if (!NLMSG_OK (resp_nh, len))
                {

-                       LOG(0, 0, 0, "Malformed answer getting tun ifindex\n");
+                       LOG(0, 0, 0, "Malformed answer getting tun ifindex %ld\n", len);

                        exit(1);
                }
 
                        exit(1);
                }
 


@@ -682,7 +668,6 @@ static void inittun(void)
                tunidx = ifinfo.ifi_index;
        }
        {
                tunidx = ifinfo.ifi_index;
        }
        {

-               ssize_t err;

                struct {
                        // interface setting
                        struct nlmsghdr nh;
                struct {
                        // interface setting
                        struct nlmsghdr nh;


@@ -692,175 +677,114 @@ static void inittun(void)
                        } ifmsg __attribute__ ((aligned(NLMSG_ALIGNTO)));
                        char rtdata[32]; // 32 should be enough
                } req;
                        } ifmsg __attribute__ ((aligned(NLMSG_ALIGNTO)));
                        char rtdata[32]; // 32 should be enough
                } req;

-               struct {
-                       struct rtattr rta;
-                       uint32_t u32 __attribute__ ((aligned(RTA_ALIGNTO)));;
-               } u32_attr;
-               struct {
-                       struct rtattr rta;
-                       struct in_addr addr __attribute__ ((aligned(RTA_ALIGNTO)));;
-               } ipv4_attr;
-               struct {
-                       struct rtattr rta;
-                       struct in6_addr addr6 __attribute__ ((aligned(RTA_ALIGNTO)));;
-               } ipv6_attr;
-               char buf[256];
-               ssize_t buf_len;
-               char *buf_ptr;
+               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;
 
                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
 
 
                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
 

-               buf_ptr = NLMSG_DATA(&req.nh) + sizeof(req.ifmsg.ifinfo);
-
-               u32_attr.rta.rta_len = RTA_LENGTH(sizeof(u32_attr.u32));
-               u32_attr.rta.rta_type = IFLA_TXQLEN;

                /* Bump up the qlen to deal with bursts from the network */
                /* Bump up the qlen to deal with bursts from the network */

-               u32_attr.u32 = 1000;
-               memcpy(buf_ptr, &u32_attr, sizeof(u32_attr));
-
-               buf_ptr += RTA_ALIGN(u32_attr.rta.rta_len);
-
-               u32_attr.rta.rta_len = RTA_LENGTH(sizeof(u32_attr.u32));
-               u32_attr.rta.rta_type = IFLA_MTU;
+               txqlen = 1000;
+               netlink_addattr(&req.nh, IFLA_TXQLEN, &txqlen, sizeof(txqlen));

                /* set MTU to modem MRU */
                /* set MTU to modem MRU */

-               u32_attr.u32 = MRU;
-               memcpy(buf_ptr, &u32_attr, sizeof(u32_attr));
-
-               req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifmsg.ifinfo)
-                               + u32_attr.rta.rta_len * 2);
+               mtu = MRU;
+               netlink_addattr(&req.nh, IFLA_MTU, &mtu, sizeof(mtu));

 
 

-               if (netlink_send(&req.nh, 1) < 0)
-               {
-                       LOG(0, 0, 0, "Error setting up tun device interface: %s\n", strerror(errno));
-                       exit(1);
-               }
+               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;
 
                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;
 
 
                req.ifmsg.ifaddr.ifa_family = AF_INET;
                req.ifmsg.ifaddr.ifa_prefixlen = 32;
                req.ifmsg.ifaddr.ifa_index = ifinfo.ifi_index;
 

-               ipv4_attr.rta.rta_len = RTA_LENGTH(sizeof(ipv4_attr.addr));
-               ipv4_attr.rta.rta_type = IFA_ADDRESS;
-               ipv4_attr.addr.s_addr = config->bind_address ?
-                       config->bind_address : 0x01010101; // 1.1.1.1
-               memcpy(NLMSG_DATA(&req.nh) + sizeof(req.ifmsg.ifaddr), &ipv4_attr, sizeof(ipv4_attr));
-
-               req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifmsg.ifaddr)
-                               + ipv4_attr.rta.rta_len);
-
-               if (netlink_send(&req.nh, 1) < 0)
-               {
-                       LOG(0, 0, 0, "Error setting up tun device IPv4 address: %s\n", strerror(errno));
-                       exit(1);
-               }
+               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));

 
 

-               memset(&req, 0, sizeof(req));
+               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]) {
 
                // 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_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;
 
 
                        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;
 

-                       ipv6_attr.rta.rta_len = RTA_LENGTH(sizeof(ipv6_attr.addr6));
-                       ipv6_attr.rta.rta_type = IFA_LOCAL;

                        // Link local address is FE80::1
                        // Link local address is FE80::1

-                       memset(&ipv6_attr.addr6, 0, sizeof(ipv6_attr.addr6));
-                       ipv6_attr.addr6.s6_addr[0] = 0xFE;
-                       ipv6_attr.addr6.s6_addr[1] = 0x80;
-                       ipv6_attr.addr6.s6_addr[15] = 1;
-                       memcpy(NLMSG_DATA(&req.nh) + sizeof(req.ifmsg.ifaddr), &ipv6_attr, sizeof(ipv6_attr));
-
-                       req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifmsg.ifaddr)
-                                       + ipv6_attr.rta.rta_len);
+                       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, 1) < 0)
-                       {
-                               LOG(0, 0, 0, "Error setting up tun device IPv6 LL address: %s\n", strerror(errno));
-                               exit(1);
-                       }
+                       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;
 
                        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;
 
 
                        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;
 

-                       ipv6_attr.rta.rta_len = RTA_LENGTH(sizeof(ipv6_attr.addr6));
-                       ipv6_attr.rta.rta_type = IFA_LOCAL;

                        // Global address is prefix::1
                        // Global address is prefix::1

-                       ipv6_attr.addr6 = config->ipv6_prefix;
-                       ipv6_attr.addr6.s6_addr[15] = 1;
-                       memcpy(NLMSG_DATA(&req.nh) + sizeof(req.ifmsg.ifaddr), &ipv6_attr, sizeof(ipv6_attr));
-
-                       req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifmsg.ifaddr)
-                                       + ipv6_attr.rta.rta_len);
-
-                       if (netlink_send(&req.nh, 1) < 0)
-                       {
-                               LOG(0, 0, 0, "Error setting up tun device IPv6 global address: %s\n", strerror(errno));
-                               exit(1);
-                       }
+                       ip6 = config->ipv6_prefix;
+                       ip6.s6_addr[15] = 1;
+                       netlink_addattr(&req.nh, IFA_LOCAL, &ip6, sizeof(ip6));

 
 

-                       memset(&req, 0, sizeof(req));
+                       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);
 
                req.nh.nlmsg_type = NLMSG_DONE;
                req.nh.nlmsg_len = NLMSG_LENGTH(0);
 

-               if (netlink_send(&req.nh, 1) < 0)
-               {
-                       LOG(0, 0, 0, "Error finishing setting up tun device: %s\n", strerror(errno));
-                       exit(1);
-               }
+               if (netlink_send(&req.nh) < 0)
+                       goto senderror;

 
 

-               buf_ptr = buf;
-               buf_len = sizeof(buf);
-               do
-               {
-                       len = netlink_recv(buf_ptr, sizeof(buf_len));
-                       if (len < 0)
-                       {
-                               LOG(0, 0, 0, "Error waiting for ack setting up tun device: %s\n", strerror(errno));
-                               exit(1);
-                       }
+               // 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
+       }

 
 

-                       resp_nh = (struct nlmsghdr *)buf_ptr;
-                       buf_len -= len;
-                       buf_ptr += len;
-               }
-               while (buf_len > 0 && (resp_nh->nlmsg_flags & NLM_F_MULTI)
-                               && resp_nh->nlmsg_type != NLMSG_DONE);
+       return;

 
 

-               if ((err = netlink_check_ack((struct nlmsghdr *)buf, buf_len, 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");
-                       exit(1);
-               }
-       }
+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


@@ -2006,11 +1930,11 @@ 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;
                }
 


@@ -3736,8 +3660,8 @@ 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


@@ -3761,8 +3685,8 @@ 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 */
        {


@@ -3798,6 +3722,10 @@ 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


@@ -3934,6 +3862,32 @@ 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);
                                }


@@ -4492,18 +4446,18 @@ 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.


@@ -4561,7 +4515,7 @@ 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;


@@ -4571,15 +4525,14 @@ 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
                {


@@ -5228,11 +5181,11 @@ 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


@@ -5303,7 +5256,7 @@ 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


@@ -5314,11 +5267,11 @@ 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


@@ -5337,11 +5290,11 @@ 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