#include <sched.h>
#include <sys/sysinfo.h>
#include <libcli.h>
+#include <linux/netlink.h>
+#include <linux/rtnetlink.h>
#include "md5.h"
#include "l2tpns.h"
// Globals
configt *config = NULL; // all configuration
+int nlfd = -1; // netlink socket
int tunfd = -1; // tun interface file handle. (network device)
int udpfd = -1; // UDP file handle
int controlfd = -1; // Control signal handle
int daefd = -1; // Socket listening for DAE connections.
int snoopfd = -1; // UDP file handle for sending out intercept data
int *radfds = NULL; // RADIUS requests file handles
-int ifrfd = -1; // File descriptor for routing, etc
-int ifr6fd = -1; // File descriptor for IPv6 routing, etc
int rand_fd = -1; // Random data source
int cluster_sockfd = -1; // Intra-cluster communications socket.
int epollfd = -1; // event polling
time_t basetime = 0; // base clock
char hostname[1000] = ""; // us.
static int tunidx; // ifr_ifindex of tun device
+int nlseqnum = 0; // netlink sequence number
+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
// 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;
+ in_addr_t mask;
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;
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;
- 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)
#ifdef BGP
if (add)
- bgp_add_route(htonl(ip), htonl(mask));
+ bgp_add_route(htonl(ip), prefixlen);
else
- bgp_del_route(htonl(ip), htonl(mask));
+ bgp_del_route(htonl(ip), prefixlen);
#endif /* BGP */
// Add/Remove the IPs to the 'sessionbyip' cache.
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);
}
}
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 */
+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)
{
+ struct ifinfomsg ifinfo;
struct ifreq ifr;
- struct in6_ifreq ifr6;
- struct sockaddr_in sin = {0};
+
memset(&ifr, 0, sizeof(ifr));
ifr.ifr_flags = IFF_TUN;
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);
+ assert(strlen(ifr.ifr_name) < sizeof(config->tundevice) - 1);
+ strncpy(config->tundevice, ifr.ifr_name, sizeof(config->tundevice));
- sin.sin_family = AF_INET;
- sin.sin_addr.s_addr = config->bind_address ? config->bind_address : 0x01010101; // 1.1.1.1
- memcpy(&ifr.ifr_addr, &sin, sizeof(struct sockaddr));
-
- if (ioctl(ifrfd, SIOCSIFADDR, (void *) &ifr) < 0)
- {
- LOG(0, 0, 0, "Error setting tun address: %s\n", strerror(errno));
- exit(1);
- }
- /* Bump up the qlen to deal with bursts from the network */
- ifr.ifr_qlen = 1000;
- if (ioctl(ifrfd, SIOCSIFTXQLEN, (void *) &ifr) < 0)
- {
- LOG(0, 0, 0, "Error setting tun queue length: %s\n", strerror(errno));
- exit(1);
- }
- /* set MTU to modem MRU */
- ifr.ifr_mtu = MRU;
- if (ioctl(ifrfd, SIOCSIFMTU, (void *) &ifr) < 0)
- {
- LOG(0, 0, 0, "Error setting tun MTU: %s\n", strerror(errno));
- exit(1);
- }
- ifr.ifr_flags = IFF_UP;
- if (ioctl(ifrfd, SIOCSIFFLAGS, (void *) &ifr) < 0)
- {
- LOG(0, 0, 0, "Error setting tun flags: %s\n", strerror(errno));
- exit(1);
- }
- if (ioctl(ifrfd, SIOCGIFINDEX, (void *) &ifr) < 0)
{
- LOG(0, 0, 0, "Error getting tun ifindex: %s\n", strerror(errno));
- exit(1);
- }
- tunidx = ifr.ifr_ifindex;
+ // get the interface index
+ struct {
+ struct nlmsghdr nh;
+ struct ifinfomsg ifinfo __attribute__ ((aligned(NLMSG_ALIGNTO)));
+ struct rtattr ifname_rta __attribute__ ((aligned(RTA_ALIGNTO)));
+ char ifname[IFNAMSIZ];
+ } req;
+ char buf[4096];
+ ssize_t len;
+ struct nlmsghdr *resp_nh;
- // Only setup IPv6 on the tun device if we have a configured prefix
- if (config->ipv6_prefix.s6_addr[0]) {
- ifr6fd = socket(PF_INET6, SOCK_DGRAM, 0);
+ req.nh.nlmsg_type = RTM_GETLINK;
+ req.nh.nlmsg_flags = NLM_F_REQUEST;
+ req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifinfo));
- // Link local address is FE80::1
- memset(&ifr6.ifr6_addr, 0, sizeof(ifr6.ifr6_addr));
- ifr6.ifr6_addr.s6_addr[0] = 0xFE;
- ifr6.ifr6_addr.s6_addr[1] = 0x80;
- ifr6.ifr6_addr.s6_addr[15] = 1;
- ifr6.ifr6_prefixlen = 64;
- ifr6.ifr6_ifindex = ifr.ifr_ifindex;
- if (ioctl(ifr6fd, SIOCSIFADDR, (void *) &ifr6) < 0)
+ req.ifinfo.ifi_family = AF_UNSPEC; // as the man says
+
+ 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 __attribute__ ((aligned(NLMSG_ALIGNTO)));
+ 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
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++;
- 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;
}
# 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
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 */
{
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
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);
}
//
// 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;
- 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 ;
- 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.
{
// 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;
continue;
}
start = ntohl(inet_addr(pool));
- mask = (in_addr_t) (pow(2, numbits) - 1) << (32 - numbits);
// 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
{
}
}
+ initnetlink();
+
/* Set up the cluster communications port. */
if (cluster_init() < 0)
exit(1);
// 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++;
- 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
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
// 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++;
- 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
// 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++;
- 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
projects / l2tpns.git / blobdiff