diff options
Diffstat (limited to 'src/libsystemd-network/sd-ndisc.c')
| -rw-r--r-- | src/libsystemd-network/sd-ndisc.c | 420 |
1 files changed, 0 insertions, 420 deletions
diff --git a/src/libsystemd-network/sd-ndisc.c b/src/libsystemd-network/sd-ndisc.c deleted file mode 100644 index 1d3be9b862..0000000000 --- a/src/libsystemd-network/sd-ndisc.c +++ /dev/null @@ -1,420 +0,0 @@ -/*** - 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 <netinet/in.h> - -#include "sd-ndisc.h" - -#include "alloc-util.h" -#include "fd-util.h" -#include "icmp6-util.h" -#include "in-addr-util.h" -#include "ndisc-internal.h" -#include "ndisc-router.h" -#include "socket-util.h" -#include "string-util.h" -#include "util.h" - -#define NDISC_ROUTER_SOLICITATION_INTERVAL (4U * USEC_PER_SEC) -#define NDISC_MAX_ROUTER_SOLICITATIONS 3U - -static void ndisc_callback(sd_ndisc *ndisc, sd_ndisc_event event, sd_ndisc_router *rt) { - assert(ndisc); - - log_ndisc("Invoking callback for '%c'.", event); - - if (!ndisc->callback) - return; - - ndisc->callback(ndisc, event, rt, ndisc->userdata); -} - -_public_ int sd_ndisc_set_callback( - sd_ndisc *nd, - sd_ndisc_callback_t callback, - void *userdata) { - - assert_return(nd, -EINVAL); - - nd->callback = callback; - nd->userdata = userdata; - - return 0; -} - -_public_ int sd_ndisc_set_ifindex(sd_ndisc *nd, int ifindex) { - assert_return(nd, -EINVAL); - assert_return(ifindex > 0, -EINVAL); - assert_return(nd->fd < 0, -EBUSY); - - nd->ifindex = ifindex; - return 0; -} - -_public_ int sd_ndisc_set_mac(sd_ndisc *nd, const struct ether_addr *mac_addr) { - assert_return(nd, -EINVAL); - - if (mac_addr) - nd->mac_addr = *mac_addr; - else - zero(nd->mac_addr); - - return 0; -} - -_public_ int sd_ndisc_attach_event(sd_ndisc *nd, sd_event *event, int64_t priority) { - int r; - - assert_return(nd, -EINVAL); - assert_return(nd->fd < 0, -EBUSY); - 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; -} - -_public_ int sd_ndisc_detach_event(sd_ndisc *nd) { - - assert_return(nd, -EINVAL); - assert_return(nd->fd < 0, -EBUSY); - - nd->event = sd_event_unref(nd->event); - return 0; -} - -_public_ sd_event *sd_ndisc_get_event(sd_ndisc *nd) { - assert_return(nd, NULL); - - return nd->event; -} - -_public_ sd_ndisc *sd_ndisc_ref(sd_ndisc *nd) { - - if (!nd) - return NULL; - - assert(nd->n_ref > 0); - nd->n_ref++; - - return nd; -} - -static int ndisc_reset(sd_ndisc *nd) { - assert(nd); - - nd->timeout_event_source = sd_event_source_unref(nd->timeout_event_source); - nd->recv_event_source = sd_event_source_unref(nd->recv_event_source); - nd->fd = safe_close(nd->fd); - - return 0; -} - -_public_ sd_ndisc *sd_ndisc_unref(sd_ndisc *nd) { - - if (!nd) - return NULL; - - assert(nd->n_ref > 0); - nd->n_ref--; - - if (nd->n_ref > 0) - return NULL; - - ndisc_reset(nd); - sd_ndisc_detach_event(nd); - return mfree(nd); -} - -_public_ int sd_ndisc_new(sd_ndisc **ret) { - _cleanup_(sd_ndisc_unrefp) sd_ndisc *nd = NULL; - - assert_return(ret, -EINVAL); - - nd = new0(sd_ndisc, 1); - if (!nd) - return -ENOMEM; - - nd->n_ref = 1; - nd->fd = -1; - - *ret = nd; - nd = NULL; - - return 0; -} - -_public_ int sd_ndisc_get_mtu(sd_ndisc *nd, uint32_t *mtu) { - assert_return(nd, -EINVAL); - assert_return(mtu, -EINVAL); - - if (nd->mtu == 0) - return -ENODATA; - - *mtu = nd->mtu; - return 0; -} - -_public_ int sd_ndisc_get_hop_limit(sd_ndisc *nd, uint8_t *ret) { - assert_return(nd, -EINVAL); - assert_return(ret, -EINVAL); - - if (nd->hop_limit == 0) - return -ENODATA; - - *ret = nd->hop_limit; - return 0; -} - -static int ndisc_handle_datagram(sd_ndisc *nd, sd_ndisc_router *rt) { - int r; - - assert(nd); - assert(rt); - - r = ndisc_router_parse(rt); - if (r == -EBADMSG) /* Bad packet */ - return 0; - if (r < 0) - return 0; - - /* Update global variables we keep */ - if (rt->mtu > 0) - nd->mtu = rt->mtu; - if (rt->hop_limit > 0) - nd->hop_limit = rt->hop_limit; - - log_ndisc("Received Router Advertisement: flags %s preference %s lifetime %" PRIu16 " sec", - rt->flags & ND_RA_FLAG_MANAGED ? "MANAGED" : rt->flags & ND_RA_FLAG_OTHER ? "OTHER" : "none", - rt->preference == SD_NDISC_PREFERENCE_HIGH ? "high" : rt->preference == SD_NDISC_PREFERENCE_LOW ? "low" : "medium", - rt->lifetime); - - ndisc_callback(nd, SD_NDISC_EVENT_ROUTER, rt); - return 0; -} - -static int ndisc_recv(sd_event_source *s, int fd, uint32_t revents, void *userdata) { - _cleanup_(sd_ndisc_router_unrefp) sd_ndisc_router *rt = NULL; - sd_ndisc *nd = userdata; - union { - struct cmsghdr cmsghdr; - uint8_t buf[CMSG_SPACE(sizeof(int)) + /* ttl */ - CMSG_SPACE(sizeof(struct timeval))]; - } control = {}; - struct iovec iov = {}; - union sockaddr_union sa = {}; - struct msghdr msg = { - .msg_name = &sa.sa, - .msg_namelen = sizeof(sa), - .msg_iov = &iov, - .msg_iovlen = 1, - .msg_control = &control, - .msg_controllen = sizeof(control), - }; - struct cmsghdr *cmsg; - ssize_t len, buflen; - - assert(s); - assert(nd); - assert(nd->event); - - buflen = next_datagram_size_fd(fd); - if (buflen < 0) - return log_ndisc_errno(buflen, "Failed to determine datagram size to read: %m"); - - rt = ndisc_router_new(buflen); - if (!rt) - return -ENOMEM; - - iov.iov_base = NDISC_ROUTER_RAW(rt); - iov.iov_len = rt->raw_size; - - len = recvmsg(fd, &msg, MSG_DONTWAIT); - if (len < 0) { - if (errno == EAGAIN || errno == EINTR) - return 0; - - return log_ndisc_errno(errno, "Could not receive message from ICMPv6 socket: %m"); - } - - if ((size_t) len != rt->raw_size) { - log_ndisc("Packet size mismatch."); - return -EINVAL; - } - - if (msg.msg_namelen == sizeof(struct sockaddr_in6) && - sa.in6.sin6_family == AF_INET6) { - - if (in_addr_is_link_local(AF_INET6, (union in_addr_union*) &sa.in6.sin6_addr) <= 0) { - _cleanup_free_ char *addr = NULL; - - (void) in_addr_to_string(AF_INET6, (union in_addr_union*) &sa.in6.sin6_addr, &addr); - log_ndisc("Received RA from non-link-local address %s. Ignoring.", strna(addr)); - return 0; - } - - rt->address = sa.in6.sin6_addr; - - } else if (msg.msg_namelen > 0) { - log_ndisc("Received invalid source address size from ICMPv6 socket: %zu bytes", (size_t) msg.msg_namelen); - return -EINVAL; - } - - /* namelen == 0 only happens when running the test-suite over a socketpair */ - - assert(!(msg.msg_flags & MSG_CTRUNC)); - assert(!(msg.msg_flags & MSG_TRUNC)); - - CMSG_FOREACH(cmsg, &msg) { - if (cmsg->cmsg_level == SOL_IPV6 && - cmsg->cmsg_type == IPV6_HOPLIMIT && - cmsg->cmsg_len == CMSG_LEN(sizeof(int))) { - int hops = *(int*) CMSG_DATA(cmsg); - - if (hops != 255) { - log_ndisc("Received RA with invalid hop limit %d. Ignoring.", hops); - return 0; - } - } - - if (cmsg->cmsg_level == SOL_SOCKET && - cmsg->cmsg_type == SO_TIMESTAMP && - cmsg->cmsg_len == CMSG_LEN(sizeof(struct timeval))) - triple_timestamp_from_realtime(&rt->timestamp, timeval_load((struct timeval*) CMSG_DATA(cmsg))); - } - - if (!triple_timestamp_is_set(&rt->timestamp)) - triple_timestamp_get(&rt->timestamp); - - nd->timeout_event_source = sd_event_source_unref(nd->timeout_event_source); - - return ndisc_handle_datagram(nd, rt); -} - -static int ndisc_timeout(sd_event_source *s, uint64_t usec, void *userdata) { - sd_ndisc *nd = userdata; - usec_t time_now, next_timeout; - int r; - - assert(s); - assert(nd); - assert(nd->event); - - if (nd->nd_sent >= NDISC_MAX_ROUTER_SOLICITATIONS) { - nd->timeout_event_source = sd_event_source_unref(nd->timeout_event_source); - ndisc_callback(nd, SD_NDISC_EVENT_TIMEOUT, NULL); - return 0; - } - - r = icmp6_send_router_solicitation(nd->fd, &nd->mac_addr); - if (r < 0) { - log_ndisc_errno(r, "Error sending Router Solicitation: %m"); - goto fail; - } - - log_ndisc("Sent Router Solicitation"); - nd->nd_sent++; - - assert_se(sd_event_now(nd->event, clock_boottime_or_monotonic(), &time_now) >= 0); - next_timeout = time_now + NDISC_ROUTER_SOLICITATION_INTERVAL; - - r = sd_event_source_set_time(nd->timeout_event_source, next_timeout); - if (r < 0) { - log_ndisc_errno(r, "Error updating timer: %m"); - goto fail; - } - - r = sd_event_source_set_enabled(nd->timeout_event_source, SD_EVENT_ONESHOT); - if (r < 0) { - log_ndisc_errno(r, "Error reenabling timer: %m"); - goto fail; - } - - return 0; - -fail: - sd_ndisc_stop(nd); - return 0; -} - -_public_ int sd_ndisc_stop(sd_ndisc *nd) { - assert_return(nd, -EINVAL); - - if (nd->fd < 0) - return 0; - - log_ndisc("Stopping IPv6 Router Solicitation client"); - - ndisc_reset(nd); - return 1; -} - -_public_ int sd_ndisc_start(sd_ndisc *nd) { - int r; - - assert_return(nd, -EINVAL); - assert_return(nd->event, -EINVAL); - assert_return(nd->ifindex > 0, -EINVAL); - - if (nd->fd >= 0) - return 0; - - assert(!nd->recv_event_source); - assert(!nd->timeout_event_source); - - nd->fd = icmp6_bind_router_solicitation(nd->ifindex); - if (nd->fd < 0) - return nd->fd; - - r = sd_event_add_io(nd->event, &nd->recv_event_source, nd->fd, EPOLLIN, ndisc_recv, nd); - if (r < 0) - goto fail; - - r = sd_event_source_set_priority(nd->recv_event_source, nd->event_priority); - if (r < 0) - goto fail; - - (void) sd_event_source_set_description(nd->recv_event_source, "ndisc-receive-message"); - - r = sd_event_add_time(nd->event, &nd->timeout_event_source, clock_boottime_or_monotonic(), 0, 0, ndisc_timeout, nd); - if (r < 0) - goto fail; - - r = sd_event_source_set_priority(nd->timeout_event_source, nd->event_priority); - if (r < 0) - goto fail; - - (void) sd_event_source_set_description(nd->timeout_event_source, "ndisc-timeout"); - - log_ndisc("Started IPv6 Router Solicitation client"); - return 1; - -fail: - ndisc_reset(nd); - return r; -} |