#include <unistd.h>
#include <signal.h>
#include <stdbool.h>
+#include <syslog.h>
+#include <alloca.h>
#include <arpa/inet.h>
#include <net/if.h>
#include <netinet/ip6.h>
#include <netpacket/packet.h>
#include <linux/netlink.h>
-#include <linux/rtnetlink.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
static int ioctl_sock;
-static int rtnl_socket = -1;
-static int rtnl_seq = 0;
static int urandom_fd = -1;
-
static void sighandler(_unused int signal)
{
uloop_end();
}
+
static void print_usage(const char *app)
{
printf(
"== %s Usage ==\n\n"
- " -h, --help Print this help\n"
- " -l level Specify log level 0..7 (default %d)\n",
- app, LOG_WARNING
+ " -h, --help Print this help\n"
+ " -l level Specify log level 0..7 (default %d)\n",
+ app, config.log_level
);
}
+
int main(int argc, char **argv)
{
openlog("odhcpd", LOG_PERROR | LOG_PID, LOG_DAEMON);
int opt;
- int log_level = LOG_INFO;
+
while ((opt = getopt(argc, argv, "hl:")) != -1) {
switch (opt) {
case 'h':
print_usage(argv[0]);
return 0;
case 'l':
- log_level = atoi(optarg);
- fprintf(stderr, "Log level set to %d\n", log_level);
+ config.log_level = (atoi(optarg) & LOG_PRIMASK);
+ fprintf(stderr, "Log level set to %d\n", config.log_level);
break;
}
}
- setlogmask(LOG_UPTO(log_level));
+ setlogmask(LOG_UPTO(config.log_level));
uloop_init();
if (getuid() != 0) {
ioctl_sock = socket(AF_INET, SOCK_DGRAM | SOCK_CLOEXEC, 0);
- if ((rtnl_socket = odhcpd_open_rtnl()) < 0) {
- syslog(LOG_ERR, "Unable to open socket: %s", strerror(errno));
- return 2;
- }
-
if ((urandom_fd = open("/dev/urandom", O_RDONLY | O_CLOEXEC)) < 0)
return 4;
signal(SIGINT, sighandler);
signal(SIGTERM, sighandler);
- if (init_router())
+ if (netlink_init())
return 4;
- if (init_dhcpv6())
+ if (router_init())
return 4;
- if (init_ndp())
+ if (dhcpv6_init())
return 4;
- if (init_dhcpv4())
+ if (ndp_init())
return 4;
+#ifdef DHCPV4_SUPPORT
+ if (dhcpv4_init())
+ return 4;
+#endif
+
odhcpd_run();
return 0;
}
-int odhcpd_open_rtnl(void)
-{
- int sock = socket(AF_NETLINK, SOCK_RAW | SOCK_CLOEXEC, NETLINK_ROUTE);
-
- // Connect to the kernel netlink interface
- struct sockaddr_nl nl = {.nl_family = AF_NETLINK};
- if (connect(sock, (struct sockaddr*)&nl, sizeof(nl))) {
- syslog(LOG_ERR, "Failed to connect to kernel rtnetlink: %s",
- strerror(errno));
- return -1;
- }
-
- return sock;
-}
-
// Read IPv6 MTU for interface
int odhcpd_get_interface_config(const char *ifname, const char *what)
}
-// Detect an IPV6-address currently assigned to the given interface
-ssize_t odhcpd_get_interface_addresses(int ifindex,
- struct odhcpd_ipaddr *addrs, size_t cnt)
-{
- struct {
- struct nlmsghdr nhm;
- struct ifaddrmsg ifa;
- } req = {{sizeof(req), RTM_GETADDR, NLM_F_REQUEST | NLM_F_DUMP,
- ++rtnl_seq, 0}, {AF_INET6, 0, 0, 0, ifindex}};
- if (send(rtnl_socket, &req, sizeof(req), 0) < (ssize_t)sizeof(req)) {
- syslog(LOG_WARNING, "Request failed to dump IPv6 addresses (%s)", strerror(errno));
- return 0;
- }
-
- uint8_t buf[8192];
- ssize_t len = 0, ret = 0;
-
- for (struct nlmsghdr *nhm = NULL; ; nhm = NLMSG_NEXT(nhm, len)) {
- while (len < 0 || !NLMSG_OK(nhm, (size_t)len)) {
- len = recv(rtnl_socket, buf, sizeof(buf), 0);
- nhm = (struct nlmsghdr*)buf;
- if (len < 0 || !NLMSG_OK(nhm, (size_t)len)) {
- if (errno == EINTR)
- continue;
-
- syslog(LOG_WARNING, "Failed to receive IPv6 address rtnetlink message (%s)", strerror(errno));
- ret = -1;
- goto out;
- }
- }
-
- switch (nhm->nlmsg_type) {
- case RTM_NEWADDR: {
- // Skip address but keep clearing socket buffer
- if (ret >= (ssize_t)cnt)
- continue;
-
- struct ifaddrmsg *ifa = NLMSG_DATA(nhm);
- if (ifa->ifa_scope != RT_SCOPE_UNIVERSE ||
- (ifindex && ifa->ifa_index != (unsigned)ifindex))
- continue;
-
- struct rtattr *rta = (struct rtattr*)&ifa[1];
- size_t alen = NLMSG_PAYLOAD(nhm, sizeof(*ifa));
- memset(&addrs[ret], 0, sizeof(addrs[ret]));
- addrs[ret].prefix = ifa->ifa_prefixlen;
-
- while (RTA_OK(rta, alen)) {
- if (rta->rta_type == IFA_ADDRESS) {
- memcpy(&addrs[ret].addr, RTA_DATA(rta),
- sizeof(struct in6_addr));
- } else if (rta->rta_type == IFA_CACHEINFO) {
- struct ifa_cacheinfo *ifc = RTA_DATA(rta);
- addrs[ret].preferred = ifc->ifa_prefered;
- addrs[ret].valid = ifc->ifa_valid;
- }
-
- rta = RTA_NEXT(rta, alen);
- }
-
- if (ifa->ifa_flags & IFA_F_DEPRECATED)
- addrs[ret].preferred = 0;
-
- ++ret;
- break;
- }
- case NLMSG_DONE:
- goto out;
- default:
- syslog(LOG_WARNING, "Unexpected rtnetlink message (%d) in response to IPv6 address dump", nhm->nlmsg_type);
- ret = -1;
- goto out;
- }
-
- }
-out:
- return ret;
-}
-
-int odhcpd_get_linklocal_interface_address(int ifindex, struct in6_addr *lladdr)
+static int odhcpd_get_linklocal_interface_address(int ifindex, struct in6_addr *lladdr)
{
int status = -1;
struct sockaddr_in6 addr = {AF_INET6, 0, 0, ALL_IPV6_ROUTERS, ifindex};
return status;
}
-void odhcpd_setup_route(const struct in6_addr *addr, int prefixlen,
- const struct interface *iface, const struct in6_addr *gw,
- int metric, bool add)
+/*
+ * DNS address selection criteria order :
+ * - use IPv6 address with valid lifetime if none is yet selected
+ * - use IPv6 address with a preferred lifetime if the already selected IPv6 address is deprecated
+ * - use an IPv6 ULA address if the already selected IPv6 address is not an ULA address
+ * - use the IPv6 address with the longest preferred lifetime
+ */
+int odhcpd_get_interface_dns_addr(const struct interface *iface, struct in6_addr *addr)
{
- struct req {
- struct nlmsghdr nh;
- struct rtmsg rtm;
- struct rtattr rta_dst;
- struct in6_addr dst_addr;
- struct rtattr rta_oif;
- uint32_t ifindex;
- struct rtattr rta_table;
- uint32_t table;
- struct rtattr rta_prio;
- uint32_t prio;
- struct rtattr rta_gw;
- struct in6_addr gw;
- } req = {
- {sizeof(req), 0, NLM_F_REQUEST, ++rtnl_seq, 0},
- {AF_INET6, prefixlen, 0, 0, 0, 0, 0, 0, 0},
- {sizeof(struct rtattr) + sizeof(struct in6_addr), RTA_DST},
- *addr,
- {sizeof(struct rtattr) + sizeof(uint32_t), RTA_OIF},
- iface->ifindex,
- {sizeof(struct rtattr) + sizeof(uint32_t), RTA_TABLE},
- RT_TABLE_MAIN,
- {sizeof(struct rtattr) + sizeof(uint32_t), RTA_PRIORITY},
- metric,
- {sizeof(struct rtattr) + sizeof(struct in6_addr), RTA_GATEWAY},
- IN6ADDR_ANY_INIT,
- };
+ time_t now = odhcpd_time();
+ ssize_t m = -1;
+
+ for (size_t i = 0; i < iface->addr6_len; ++i) {
+ if (iface->addr6[i].valid <= (uint32_t)now)
+ continue;
+
+ if (m < 0) {
+ m = i;
+ continue;
+ }
+
+ if (iface->addr6[m].preferred >= (uint32_t)now &&
+ iface->addr6[i].preferred < (uint32_t)now)
+ continue;
- if (gw)
- req.gw = *gw;
-
- if (add) {
- req.nh.nlmsg_type = RTM_NEWROUTE;
- req.nh.nlmsg_flags |= (NLM_F_CREATE | NLM_F_REPLACE);
- req.rtm.rtm_protocol = RTPROT_STATIC;
- req.rtm.rtm_scope = (gw) ? RT_SCOPE_UNIVERSE : RT_SCOPE_LINK;
- req.rtm.rtm_type = RTN_UNICAST;
- } else {
- req.nh.nlmsg_type = RTM_DELROUTE;
- req.rtm.rtm_scope = RT_SCOPE_NOWHERE;
+ if (IN6_IS_ADDR_ULA(&iface->addr6[i].addr.in6)) {
+ if (!IN6_IS_ADDR_ULA(&iface->addr6[m].addr.in6)) {
+ m = i;
+ continue;
+ }
+ } else if (IN6_IS_ADDR_ULA(&iface->addr6[m].addr.in6))
+ continue;
+
+ if (iface->addr6[i].preferred > iface->addr6[m].preferred)
+ m = i;
}
- req.nh.nlmsg_len = (gw) ? sizeof(req) : offsetof(struct req, rta_gw);
- send(rtnl_socket, &req, req.nh.nlmsg_len, MSG_DONTWAIT);
+ if (m >= 0) {
+ *addr = iface->addr6[m].addr.in6;
+ return 0;
+ }
+
+ return odhcpd_get_linklocal_interface_address(iface->ifindex, addr);
}
struct interface* odhcpd_get_interface_by_index(int ifindex)
{
struct odhcpd_event *e = container_of(u, struct odhcpd_event, uloop);
- uint8_t data_buf[RELAYD_BUFFER_SIZE], cmsg_buf[128];
+ uint8_t data_buf[8192], cmsg_buf[128];
union {
struct sockaddr_in6 in6;
struct sockaddr_in in;
getsockopt(u->fd, SOL_SOCKET, SO_ERROR, &ret, &ret_len);
u->error = false;
if (e->handle_error)
- e->handle_error(ret);
+ e->handle_error(e, ret);
+ }
+
+ if (e->recv_msgs) {
+ e->recv_msgs(e);
+ return;
}
while (true) {
((event->handle_error) ? ULOOP_ERROR_CB : 0));
}
+int odhcpd_deregister(struct odhcpd_event *event)
+{
+ event->uloop.cb = NULL;
+ return uloop_fd_delete(&event->uloop);
+}
+
void odhcpd_process(struct odhcpd_event *event)
{
odhcpd_receive_packets(&event->uloop, 0);
a[bytes] = (a[bytes] & mask) | ((~mask) & b[bytes]);
}
}
+
+
+int odhcpd_netmask2bitlen(bool inet6, void *mask)
+{
+ int bits;
+ struct in_addr *v4;
+ struct in6_addr *v6;
+
+ if (inet6)
+ for (bits = 0, v6 = mask;
+ bits < 128 && (v6->s6_addr[bits / 8] << (bits % 8)) & 128;
+ bits++);
+ else
+ for (bits = 0, v4 = mask;
+ bits < 32 && (ntohl(v4->s_addr) << bits) & 0x80000000;
+ bits++);
+
+ return bits;
+}
+
+bool odhcpd_bitlen2netmask(bool inet6, unsigned int bits, void *mask)
+{
+ uint8_t b;
+ struct in_addr *v4;
+ struct in6_addr *v6;
+
+ if (inet6)
+ {
+ if (bits > 128)
+ return false;
+
+ v6 = mask;
+
+ for (unsigned int i = 0; i < sizeof(v6->s6_addr); i++)
+ {
+ b = (bits > 8) ? 8 : bits;
+ v6->s6_addr[i] = (uint8_t)(0xFF << (8 - b));
+ bits -= b;
+ }
+ }
+ else
+ {
+ if (bits > 32)
+ return false;
+
+ v4 = mask;
+ v4->s_addr = bits ? htonl(~((1 << (32 - bits)) - 1)) : 0;
+ }
+
+ return true;
+}
projects / project / odhcpd.git / blobdiff