#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(
);
}
+
int main(int argc, char **argv)
{
openlog("odhcpd", LOG_PERROR | LOG_PID, LOG_DAEMON);
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 (netlink_init())
+ return 4;
+
if (router_init())
return 4;
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;
- int af;
- struct odhcpd_ipaddr **addrs;
- 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 odhcpd_ipaddr *addrs = *(ctxt->addrs);
- struct nlmsghdr *hdr = nlmsg_hdr(msg);
- struct ifaddrmsg *ifa;
- struct nlattr *nla[__IFA_MAX], *nla_addr = NULL;
-
- if (hdr->nlmsg_type != RTM_NEWADDR)
- return NL_SKIP;
-
- ifa = NLMSG_DATA(hdr);
- if (ifa->ifa_scope != RT_SCOPE_UNIVERSE ||
- (ctxt->af != ifa->ifa_family) ||
- (ctxt->ifindex && ifa->ifa_index != (unsigned)ctxt->ifindex))
- return NL_SKIP;
-
- nlmsg_parse(hdr, sizeof(*ifa), nla, __IFA_MAX - 1, NULL);
-
- switch (ifa->ifa_family) {
- case AF_INET6:
- if (nla[IFA_ADDRESS])
- nla_addr = nla[IFA_ADDRESS];
- break;
-
- case AF_INET:
- if (nla[IFA_LOCAL])
- nla_addr = nla[IFA_LOCAL];
- break;
-
- default:
- break;
- }
- if (!nla_addr)
- return NL_SKIP;
-
- addrs = realloc(addrs, sizeof(*addrs)*(ctxt->ret + 1));
- if (!addrs)
- return NL_SKIP;
-
- memset(&addrs[ctxt->ret], 0, sizeof(addrs[ctxt->ret]));
- addrs[ctxt->ret].prefix = ifa->ifa_prefixlen;
-
- nla_memcpy(&addrs[ctxt->ret].addr, nla_addr,
- sizeof(addrs[ctxt->ret].addr));
-
- if (nla[IFA_BROADCAST])
- nla_memcpy(&addrs[ctxt->ret].broadcast, nla[IFA_BROADCAST],
- sizeof(addrs[ctxt->ret].broadcast));
-
- if (nla[IFA_CACHEINFO]) {
- struct ifa_cacheinfo *ifc = nla_data(nla[IFA_CACHEINFO]);
-
- addrs[ctxt->ret].preferred = ifc->ifa_prefered;
- addrs[ctxt->ret].valid = ifc->ifa_valid;
- }
-
- if (ifa->ifa_flags & IFA_F_DEPRECATED)
- addrs[ctxt->ret].preferred = 0;
-
- ctxt->ret++;
- *(ctxt->addrs) = addrs;
-
- 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;
-}
-
-static int prefix_cmp(const void *va, const void *vb)
-{
- const struct odhcpd_ipaddr *a = va, *b = vb;
- int ret = 0;
-
- if (a->prefix == b->prefix) {
- ret = (ntohl(a->addr.in.s_addr) < ntohl(b->addr.in.s_addr)) ? 1 :
- (ntohl(a->addr.in.s_addr) > ntohl(b->addr.in.s_addr)) ? -1 : 0;
- } else
- ret = a->prefix < b->prefix ? 1 : -1;
-
- return ret;
-}
-
-// compare IPv6 prefixes
-static int prefix6_cmp(const void *va, const void *vb)
-{
- const struct odhcpd_ipaddr *a = va, *b = vb;
- uint32_t a_pref = IN6_IS_ADDR_ULA(&a->addr.in6) ? 1 : a->preferred;
- uint32_t b_pref = IN6_IS_ADDR_ULA(&b->addr.in6) ? 1 : b->preferred;
- return (a_pref < b_pref) ? 1 : (a_pref > b_pref) ? -1 : 0;
-}
-
-// Detect an IPV6-address currently assigned to the given interface
-ssize_t odhcpd_get_interface_addresses(int ifindex, bool v6, struct odhcpd_ipaddr **addrs)
-{
- struct nl_msg *msg;
- struct ifaddrmsg ifa = {
- .ifa_family = v6? AF_INET6: AF_INET,
- .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,
- .af = v6? AF_INET6: AF_INET,
- .addrs = addrs,
- .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);
-
- if (ctxt.ret <= 0)
- goto out;
-
- time_t now = odhcpd_time();
- struct odhcpd_ipaddr *addr = *addrs;
-
- qsort(addr, ctxt.ret, sizeof(*addr), v6 ? prefix6_cmp : prefix_cmp);
-
- for (ssize_t i = 0; i < ctxt.ret; ++i) {
- if (addr[i].preferred < UINT32_MAX - now)
- addr[i].preferred += now;
-
- if (addr[i].valid < UINT32_MAX - now)
- addr[i].valid += now;
- }
-
-out:
- nl_cb_put(cb);
-
- return ctxt.ret;
-}
static int odhcpd_get_linklocal_interface_address(int ifindex, struct in6_addr *lladdr)
{
return odhcpd_get_linklocal_interface_address(iface->ifindex, addr);
}
-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)
-{
- 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;
-
- if (add)
- flags |= NLM_F_REPLACE | NLM_F_CREATE;
-
- msg = nlmsg_alloc_simple(add ? RTM_NEWNEIGH : RTM_DELNEIGH, flags);
- if (!msg)
- return -1;
-
- nlmsg_append(msg, &ndm, sizeof(ndm), 0);
-
- nla_put(msg, NDA_DST, sizeof(*addr), addr);
-
- 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_addr(struct odhcpd_ipaddr *addr,
- const struct interface *iface, const bool v6,
- const bool add)
-{
- struct nl_msg *msg;
- struct ifaddrmsg ifa = {
- .ifa_family = v6 ? AF_INET6 : AF_INET,
- .ifa_prefixlen = addr->prefix,
- .ifa_flags = 0,
- .ifa_scope = 0,
- .ifa_index = iface->ifindex, };
- int ret = 0, flags = NLM_F_REQUEST;
-
- if (add)
- flags |= NLM_F_REPLACE | NLM_F_CREATE;
-
- msg = nlmsg_alloc_simple(add ? RTM_NEWADDR : RTM_DELADDR, 0);
- if (!msg)
- return -1;
-
- nlmsg_append(msg, &ifa, sizeof(ifa), flags);
- nla_put(msg, IFA_LOCAL, v6 ? 16 : 4, &addr->addr);
- if (v6) {
- struct ifa_cacheinfo cinfo = { .ifa_prefered = 0xffffffffU,
- .ifa_valid = 0xffffffffU,
- .cstamp = 0,
- .tstamp = 0 };
- time_t now = odhcpd_time();
-
- if (addr->preferred) {
- int64_t preferred = addr->preferred - now;
- if (preferred < 0)
- preferred = 0;
- else if (preferred > UINT32_MAX)
- preferred = UINT32_MAX;
-
- cinfo.ifa_prefered = preferred;
- }
-
- if (addr->valid) {
- int64_t valid = addr->valid - now;
- if (valid <= 0) {
- nlmsg_free(msg);
- return -1;
- }
- else if (valid > UINT32_MAX)
- valid = UINT32_MAX;
-
- cinfo.ifa_valid = valid;
- }
-
- nla_put(msg, IFA_CACHEINFO, sizeof(cinfo), &cinfo);
-
- nla_put_u32(msg, IFA_FLAGS, IFA_F_NOPREFIXROUTE);
- } else {
- if (addr->broadcast.s_addr)
- nla_put_u32(msg, IFA_BROADCAST, addr->broadcast.s_addr);
- }
-
- ret = nl_send_auto_complete(rtnl_socket, msg);
- nlmsg_free(msg);
-
- if (ret < 0)
- return ret;
-
- return nl_wait_for_ack(rtnl_socket);
-}
-
struct interface* odhcpd_get_interface_by_index(int ifindex)
{
struct interface *iface;
projects / project / odhcpd.git / blobdiff