--- /dev/null
+/***
+ This file is part of systemd.
+
+ Copyright (C) 2014 Intel Corporation. All rights reserved.
+
+ systemd is free software; you can redistribute it and/or modify it
+ under the terms of the GNU Lesser General Public License as published by
+ the Free Software Foundation; either version 2.1 of the License, or
+ (at your option) any later version.
+
+ systemd is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <netinet/icmp6.h>
+#include <string.h>
+#include <stdbool.h>
+#include <netinet/in.h>
+
+#include "socket-util.h"
+#include "refcnt.h"
+#include "async.h"
+
+#include "dhcp6-internal.h"
+#include "sd-icmp6-nd.h"
+
+#define ICMP6_ROUTER_SOLICITATION_INTERVAL 4 * USEC_PER_SEC
+#define ICMP6_MAX_ROUTER_SOLICITATIONS 3
+
+enum icmp6_nd_state {
+ ICMP6_NEIGHBOR_DISCOVERY_IDLE = 0,
+ ICMP6_ROUTER_SOLICITATION_SENT = 10,
+ ICMP6_ROUTER_ADVERTISMENT_LISTEN = 11,
+};
+
+struct sd_icmp6_nd {
+ RefCount n_ref;
+
+ enum icmp6_nd_state state;
+ sd_event *event;
+ int event_priority;
+ int index;
+ struct ether_addr mac_addr;
+ int fd;
+ sd_event_source *recv;
+ sd_event_source *timeout;
+ int nd_sent;
+ sd_icmp6_nd_callback_t callback;
+ void *userdata;
+};
+
+#define log_icmp6_nd(p, fmt, ...) log_meta(LOG_DEBUG, __FILE__, __LINE__, __func__, "ICMPv6 CLIENT: " fmt, ##__VA_ARGS__)
+
+static void icmp6_nd_notify(sd_icmp6_nd *nd, int event)
+{
+ if (nd->callback)
+ nd->callback(nd, event, nd->userdata);
+}
+
+int sd_icmp6_nd_set_callback(sd_icmp6_nd *nd, sd_icmp6_nd_callback_t callback,
+ void *userdata) {
+ assert(nd);
+
+ nd->callback = callback;
+ nd->userdata = userdata;
+
+ return 0;
+}
+
+int sd_icmp6_nd_set_index(sd_icmp6_nd *nd, int interface_index) {
+ assert(nd);
+ assert(interface_index >= -1);
+
+ nd->index = interface_index;
+
+ return 0;
+}
+
+int sd_icmp6_nd_set_mac(sd_icmp6_nd *nd, const struct ether_addr *mac_addr) {
+ assert(nd);
+
+ if (mac_addr)
+ memcpy(&nd->mac_addr, mac_addr, sizeof(nd->mac_addr));
+ else
+ memset(&nd->mac_addr, 0x00, sizeof(nd->mac_addr));
+
+ return 0;
+
+}
+
+int sd_icmp6_nd_attach_event(sd_icmp6_nd *nd, sd_event *event, int priority) {
+ int r;
+
+ assert_return(nd, -EINVAL);
+ assert_return(!nd->event, -EBUSY);
+
+ if (event)
+ nd->event = sd_event_ref(event);
+ else {
+ r = sd_event_default(&nd->event);
+ if (r < 0)
+ return 0;
+ }
+
+ nd->event_priority = priority;
+
+ return 0;
+}
+
+int sd_icmp6_nd_detach_event(sd_icmp6_nd *nd) {
+ assert_return(nd, -EINVAL);
+
+ nd->event = sd_event_unref(nd->event);
+
+ return 0;
+}
+
+sd_event *sd_icmp6_nd_get_event(sd_icmp6_nd *nd) {
+ assert(nd);
+
+ return nd->event;
+}
+
+sd_icmp6_nd *sd_icmp6_nd_ref(sd_icmp6_nd *nd) {
+ assert (nd);
+
+ assert_se(REFCNT_INC(nd->n_ref) >= 2);
+
+ return nd;
+}
+
+static int icmp6_nd_init(sd_icmp6_nd *nd) {
+ assert(nd);
+
+ nd->recv = sd_event_source_unref(nd->recv);
+ nd->fd = asynchronous_close(nd->fd);
+ nd->timeout = sd_event_source_unref(nd->timeout);
+
+ return 0;
+}
+
+sd_icmp6_nd *sd_icmp6_nd_unref(sd_icmp6_nd *nd) {
+ if (nd && REFCNT_DEC(nd->n_ref) <= 0) {
+
+ icmp6_nd_init(nd);
+ sd_icmp6_nd_detach_event(nd);
+
+ free(nd);
+ }
+
+ return NULL;
+}
+
+DEFINE_TRIVIAL_CLEANUP_FUNC(sd_icmp6_nd*, sd_icmp6_nd_unref);
+#define _cleanup_sd_icmp6_nd_free_ _cleanup_(sd_icmp6_nd_unrefp)
+
+int sd_icmp6_nd_new(sd_icmp6_nd **ret) {
+ _cleanup_sd_icmp6_nd_free_ sd_icmp6_nd *nd = NULL;
+
+ assert(ret);
+
+ nd = new0(sd_icmp6_nd, 1);
+ if (!nd)
+ return -ENOMEM;
+
+ nd->n_ref = REFCNT_INIT;
+
+ nd->index = -1;
+
+ *ret = nd;
+ nd = NULL;
+
+ return 0;
+}
+
+static int icmp6_router_advertisment_recv(sd_event_source *s, int fd,
+ uint32_t revents, void *userdata)
+{
+ sd_icmp6_nd *nd = userdata;
+ ssize_t len;
+ struct nd_router_advert ra;
+ int event = ICMP6_EVENT_ROUTER_ADVERTISMENT_NONE;
+
+ assert(s);
+ assert(nd);
+ assert(nd->event);
+
+ /* only interested in Managed/Other flag */
+ len = read(fd, &ra, sizeof(ra));
+ if ((size_t)len < sizeof(ra))
+ return 0;
+
+ if (ra.nd_ra_type != ND_ROUTER_ADVERT)
+ return 0;
+
+ if (ra.nd_ra_code != 0)
+ return 0;
+
+ nd->timeout = sd_event_source_unref(nd->timeout);
+
+ nd->state = ICMP6_ROUTER_ADVERTISMENT_LISTEN;
+
+ if (ra.nd_ra_flags_reserved & ND_RA_FLAG_OTHER )
+ event = ICMP6_EVENT_ROUTER_ADVERTISMENT_OTHER;
+
+ if (ra.nd_ra_flags_reserved & ND_RA_FLAG_MANAGED)
+ event = ICMP6_EVENT_ROUTER_ADVERTISMENT_MANAGED;
+
+ log_icmp6_nd(nd, "Received Router Advertisment flags %s/%s",
+ (ra.nd_ra_flags_reserved & ND_RA_FLAG_MANAGED)? "MANAGED":
+ "none",
+ (ra.nd_ra_flags_reserved & ND_RA_FLAG_OTHER)? "OTHER":
+ "none");
+
+ icmp6_nd_notify(nd, event);
+
+ return 0;
+}
+
+static int icmp6_router_solicitation_timeout(sd_event_source *s, uint64_t usec,
+ void *userdata)
+{
+ sd_icmp6_nd *nd = userdata;
+ uint64_t time_now, next_timeout;
+ struct ether_addr unset = { };
+ struct ether_addr *addr = NULL;
+ int r;
+
+ assert(s);
+ assert(nd);
+ assert(nd->event);
+
+ nd->timeout = sd_event_source_unref(nd->timeout);
+
+ if (nd->nd_sent >= ICMP6_MAX_ROUTER_SOLICITATIONS) {
+ icmp6_nd_notify(nd, ICMP6_EVENT_ROUTER_ADVERTISMENT_TIMEOUT);
+ nd->state = ICMP6_ROUTER_ADVERTISMENT_LISTEN;
+ } else {
+ if (memcmp(&nd->mac_addr, &unset, sizeof(struct ether_addr)))
+ addr = &nd->mac_addr;
+
+ r = dhcp_network_icmp6_send_router_solicitation(nd->fd, addr);
+ if (r < 0)
+ log_icmp6_nd(nd, "Error sending Router Solicitation");
+ else {
+ nd->state = ICMP6_ROUTER_SOLICITATION_SENT;
+ log_icmp6_nd(nd, "Sent Router Solicitation");
+ }
+
+ nd->nd_sent++;
+
+ r = sd_event_now(nd->event, CLOCK_MONOTONIC, &time_now);
+ if (r < 0) {
+ icmp6_nd_notify(nd, r);
+ return 0;
+ }
+
+ next_timeout = time_now + ICMP6_ROUTER_SOLICITATION_INTERVAL;
+
+ r = sd_event_add_time(nd->event, &nd->timeout, CLOCK_MONOTONIC,
+ next_timeout, 0,
+ icmp6_router_solicitation_timeout, nd);
+ if (r < 0) {
+ icmp6_nd_notify(nd, r);
+ return 0;
+ }
+
+ r = sd_event_source_set_priority(nd->timeout,
+ nd->event_priority);
+ if (r < 0) {
+ icmp6_nd_notify(nd, r);
+ return 0;
+ }
+ }
+
+ return 0;
+}
+
+int sd_icmp6_router_solicitation_start(sd_icmp6_nd *nd) {
+ int r;
+
+ assert(nd);
+ assert(nd->event);
+
+ if (nd->state != ICMP6_NEIGHBOR_DISCOVERY_IDLE)
+ return -EINVAL;
+
+ if (nd->index < 1)
+ return -EINVAL;
+
+ r = dhcp_network_icmp6_bind_router_solicitation(nd->index);
+ if (r < 0)
+ return r;
+
+ nd->fd = r;
+
+ r = sd_event_add_io(nd->event, &nd->recv, nd->fd, EPOLLIN,
+ icmp6_router_advertisment_recv, nd);
+ if (r < 0)
+ goto error;
+
+ r = sd_event_source_set_priority(nd->recv, nd->event_priority);
+ if (r < 0)
+ goto error;
+
+ r = sd_event_add_time(nd->event, &nd->timeout, CLOCK_MONOTONIC,
+ 0, 0, icmp6_router_solicitation_timeout, nd);
+ if (r < 0)
+ goto error;
+
+ r = sd_event_source_set_priority(nd->timeout, nd->event_priority);
+
+error:
+ if (r < 0)
+ icmp6_nd_init(nd);
+ else
+ log_icmp6_nd(client, "Start Router Solicitation");
+
+ return r;
+}
~ianmdlvl / elogind.git / blobdiff