#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/if_addr.h>
-#include <linux/neighbour.h>
-#include <linux/rtnetlink.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <sys/wait.h>
#include <sys/syscall.h>
-#include <netlink/msg.h>
-#include <netlink/socket.h>
-#include <netlink/attr.h>
#include <libubox/uloop.h>
#include "odhcpd.h"
static int ioctl_sock;
-static struct nl_sock *rtnl_socket = NULL;
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
+ 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_create_nl_socket(NETLINK_ROUTE))) {
- syslog(LOG_ERR, "Unable to open nl 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 (router_init())
return 4;
- if (init_dhcpv6())
+ if (dhcpv6_init())
return 4;
- if (init_ndp())
+ if (ndp_init())
return 4;
- if (init_dhcpv4())
+#ifdef DHCPV4_SUPPORT
+ if (dhcpv4_init())
return 4;
+#endif
odhcpd_run();
return 0;
}
-struct nl_sock *odhcpd_create_nl_socket(int protocol)
-{
- struct nl_sock *nl_sock;
-
- nl_sock = nl_socket_alloc();
- if (!nl_sock)
- goto err;
-
- if (nl_connect(nl_sock, protocol) < 0)
- goto err;
-
- return nl_sock;
-
-err:
- if (nl_sock)
- nl_socket_free(nl_sock);
-
- return NULL;
-}
-
// Read IPv6 MTU for interface
int odhcpd_get_interface_config(const char *ifname, const char *what)
return sent;
}
-struct addr_info {
- int ifindex;
- struct odhcpd_ipaddr *addrs;
- size_t addrs_sz;
- int pending;
- ssize_t ret;
-};
-
-static int cb_valid_handler(struct nl_msg *msg, void *arg)
-{
- struct addr_info *ctxt = (struct addr_info *)arg;
- struct nlmsghdr *hdr = nlmsg_hdr(msg);
- struct ifaddrmsg *ifa;
- struct nlattr *nla[__IFA_MAX];
-
- if (hdr->nlmsg_type != RTM_NEWADDR || ctxt->ret >= (ssize_t)ctxt->addrs_sz)
- return NL_SKIP;
-
- ifa = NLMSG_DATA(hdr);
- if (ifa->ifa_scope != RT_SCOPE_UNIVERSE ||
- (ctxt->ifindex && ifa->ifa_index != (unsigned)ctxt->ifindex))
- return NL_SKIP;
-
- nlmsg_parse(hdr, sizeof(*ifa), nla, __IFA_MAX - 1, NULL);
- if (!nla[IFA_ADDRESS])
- return NL_SKIP;
-
- memset(&ctxt->addrs[ctxt->ret], 0, sizeof(ctxt->addrs[ctxt->ret]));
- ctxt->addrs[ctxt->ret].prefix = ifa->ifa_prefixlen;
-
- nla_memcpy(&ctxt->addrs[ctxt->ret].addr, nla[IFA_ADDRESS],
- sizeof(ctxt->addrs[ctxt->ret].addr));
-
- if (nla[IFA_CACHEINFO]) {
- struct ifa_cacheinfo *ifc = nla_data(nla[IFA_CACHEINFO]);
-
- ctxt->addrs[ctxt->ret].preferred = ifc->ifa_prefered;
- ctxt->addrs[ctxt->ret].valid = ifc->ifa_valid;
- }
-
- if (ifa->ifa_flags & IFA_F_DEPRECATED)
- ctxt->addrs[ctxt->ret].preferred = 0;
-
- ctxt->ret++;
-
- return NL_OK;
-}
-
-static int cb_finish_handler(_unused struct nl_msg *msg, void *arg)
-{
- struct addr_info *ctxt = (struct addr_info *)arg;
-
- ctxt->pending = 0;
-
- return NL_STOP;
-}
-
-static int cb_error_handler(_unused struct sockaddr_nl *nla, struct nlmsgerr *err,
- void *arg)
-{
- struct addr_info *ctxt = (struct addr_info *)arg;
-
- ctxt->pending = 0;
- ctxt->ret = err->error;
-
- return NL_STOP;
-}
-
-// 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 nl_msg *msg;
- struct ifaddrmsg ifa = {
- .ifa_family = AF_INET6,
- .ifa_prefixlen = 0,
- .ifa_flags = 0,
- .ifa_scope = 0,
- .ifa_index = ifindex, };
- struct nl_cb *cb = nl_cb_alloc(NL_CB_DEFAULT);
- struct addr_info ctxt = {
- .ifindex = ifindex,
- .addrs = addrs,
- .addrs_sz = cnt,
- .ret = 0,
- .pending = 1,
- };
-
- if (!cb) {
- ctxt.ret = -1;
- goto out;
- }
-
- msg = nlmsg_alloc_simple(RTM_GETADDR, NLM_F_REQUEST | NLM_F_DUMP);
-
- if (!msg) {
- ctxt.ret = - 1;
- goto out;
- }
-
- nlmsg_append(msg, &ifa, sizeof(ifa), 0);
-
- nl_cb_set(cb, NL_CB_VALID, NL_CB_CUSTOM, cb_valid_handler, &ctxt);
- nl_cb_set(cb, NL_CB_FINISH, NL_CB_CUSTOM, cb_finish_handler, &ctxt);
- nl_cb_err(cb, NL_CB_CUSTOM, cb_error_handler, &ctxt);
-
- nl_send_auto_complete(rtnl_socket, msg);
- while (ctxt.pending > 0)
- nl_recvmsgs(rtnl_socket, cb);
- nlmsg_free(msg);
-out:
- nl_cb_put(cb);
-
- return ctxt.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;
}
-int odhcpd_setup_route(const struct in6_addr *addr, const int prefixlen,
- const struct interface *iface, const struct in6_addr *gw,
- const uint32_t metric, const bool add)
-{
- struct nl_msg *msg;
- struct rtmsg rtm = {
- .rtm_family = AF_INET6,
- .rtm_dst_len = prefixlen,
- .rtm_src_len = 0,
- .rtm_table = RT_TABLE_MAIN,
- .rtm_protocol = (add ? RTPROT_STATIC : RTPROT_UNSPEC),
- .rtm_scope = (add ? (gw ? RT_SCOPE_UNIVERSE : RT_SCOPE_LINK) : RT_SCOPE_NOWHERE),
- .rtm_type = (add ? RTN_UNICAST : RTN_UNSPEC),
- };
- int ret = 0;
-
- msg = nlmsg_alloc_simple(add ? RTM_NEWROUTE : RTM_DELROUTE,
- add ? NLM_F_CREATE | NLM_F_REPLACE : 0);
- if (!msg)
- return -1;
-
- nlmsg_append(msg, &rtm, sizeof(rtm), 0);
-
- nla_put(msg, RTA_DST, sizeof(*addr), addr);
- nla_put_u32(msg, RTA_OIF, iface->ifindex);
- nla_put_u32(msg, RTA_PRIORITY, metric);
-
- if (gw)
- nla_put(msg, RTA_GATEWAY, sizeof(*gw), gw);
-
- ret = nl_send_auto_complete(rtnl_socket, msg);
- nlmsg_free(msg);
-
- if (ret < 0)
- return ret;
-
- return nl_wait_for_ack(rtnl_socket);
-}
-
-int odhcpd_setup_proxy_neigh(const struct in6_addr *addr,
- const struct interface *iface, const 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 nl_msg *msg;
- struct ndmsg ndm = {
- .ndm_family = AF_INET6,
- .ndm_flags = NTF_PROXY,
- .ndm_ifindex = iface->ifindex,
- };
- int ret = 0, flags = NLM_F_REQUEST;
+ time_t now = odhcpd_time();
+ ssize_t m = -1;
- if (add)
- flags |= NLM_F_REPLACE | NLM_F_CREATE;
+ for (size_t i = 0; i < iface->addr6_len; ++i) {
+ if (iface->addr6[i].valid <= (uint32_t)now)
+ continue;
- msg = nlmsg_alloc_simple(add ? RTM_NEWNEIGH : RTM_DELNEIGH, flags);
- if (!msg)
- return -1;
+ if (m < 0) {
+ m = i;
+ continue;
+ }
- nlmsg_append(msg, &ndm, sizeof(ndm), 0);
+ if (iface->addr6[m].preferred >= (uint32_t)now &&
+ iface->addr6[i].preferred < (uint32_t)now)
+ continue;
- nla_put(msg, NDA_DST, sizeof(*addr), addr);
+ 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;
- ret = nl_send_auto_complete(rtnl_socket, msg);
- nlmsg_free(msg);
+ if (iface->addr6[i].preferred > iface->addr6[m].preferred)
+ m = i;
+ }
- if (ret < 0)
- return ret;
+ if (m >= 0) {
+ *addr = iface->addr6[m].addr.in6;
+ return 0;
+ }
- return nl_wait_for_ack(rtnl_socket);
+ 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;
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