projects / l2tpns.git / blobdiff
? search:
summary | shortlog | log | commit | commitdiff | tree
raw | inline | side by side
Commiting the rework I have done until now.
[l2tpns.git] / l2tpns.c
diff --git a/l2tpns.c b/l2tpns.c
index 8fdcb53..d849711 100644 (file)
--- a/l2tpns.c
+++ b/l2tpns.c
@@ -39,6 +39,8 @@ char const *cvs_id_l2tpns = "$Id: l2tpns.c,v 1.176 2011/01/20 12:48:40 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 1.176 2011/01/20 12:48:40 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 +66,13 @@ 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
 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
@@ -514,21 +516,112 @@ 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, 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, ssize_t len, int msg_count)
+{
+       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?!
+}
 
 //
 // 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};
+       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;
 
@@ -549,71 +642,223 @@ static void inittun(void)
        }
        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));
        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);
+               // get the interface index
+               struct {
+                       struct nlmsghdr nh;
+                       struct ifinfomsg ifinfo __attribute__ ((aligned(NLMSG_ALIGNTO)));
+                       struct rtattr ifname_rta __attribute__ ((aligned(RTA_ALIGNTO)));
+                       char ifname[IFNAMSIZ];
+               } req;
+
+               req.nh.nlmsg_type = RTM_GETLINK;
+               req.nh.nlmsg_flags = NLM_F_REQUEST;
+
+               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);
+
+               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)
+               {
+                       LOG(0, 0, 0, "Error getting tun ifindex: %s\n", strerror(errno));
+                       exit(1);
+               }
+
+               resp_nh = (struct nlmsghdr *)buf;
+               if (!NLMSG_OK (resp_nh, len))
+               {
+                       LOG(0, 0, 0, "Malformed answer getting tun ifindex\n");
+                       exit(1);
+               }
+
+               memcpy(&ifinfo, NLMSG_DATA(resp_nh), sizeof(ifinfo));
+               // got index
+               tunidx = ifinfo.ifi_index;
        }
        }
-       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;
+               ssize_t err;
+               struct {
+                       // interface setting
+                       struct nlmsghdr nh;
+                       union {
+                               struct ifinfomsg ifinfo;
+                               struct ifaddrmsg ifaddr;
+                       } 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;
+
+               memset(&req, 0, sizeof(req));
+
+               req.nh.nlmsg_type = RTM_SETLINK;
+               req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_MULTI;
+
+               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 */
+               u32_attr.u32 = 1000;
+               memcpy(buf_ptr, &u32_attr, sizeof(u32_attr));
 
 
-       // 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);
+               buf_ptr += RTA_ALIGN(u32_attr.rta.rta_len);
 
 
-               // 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)
+               u32_attr.rta.rta_len = RTA_LENGTH(sizeof(u32_attr.u32));
+               u32_attr.rta.rta_type = IFLA_MTU;
+               /* 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);
+
+               if (netlink_send(&req.nh, 1) < 0)
                {
                {
-                       LOG(0, 0, 0, "Error setting tun IPv6 link local address:"
-                               " %s\n", strerror(errno));
+                       LOG(0, 0, 0, "Error setting up tun device interface: %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)
+               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.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 tun IPv6 global address: %s\n",
-                               strerror(errno));
+                       LOG(0, 0, 0, "Error setting up tun device IPv4 address: %s\n", strerror(errno));
+                       exit(1);
+               }
+
+               memset(&req, 0, sizeof(req));
+
+               // Only setup IPv6 on the tun device if we have a configured prefix
+               if (config->ipv6_prefix.s6_addr[0]) {
+                       req.nh.nlmsg_type = RTM_NEWADDR;
+                       req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_MULTI;
+
+                       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
+                       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);
+
+                       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);
+                       }
+
+                       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.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
+                       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);
+                       }
+
+                       memset(&req, 0, sizeof(req));
+               }
+
+               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);
+               }
+
+               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);
+                       }
+
+                       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);
+
+               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);
                }
        }
 }
                }
        }
 }
@@ -4530,6 +4775,8 @@ 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);
for cloning use: "git clone git://git.sameswireless.fr/l2tpns.git" ; For add to your sources.list: "deb http://package.sameswifi.fr/ jessie main"