| /*** |
| This file is part of systemd. |
| |
| Copyright 2013 Tom Gundersen <teg@jklm.no> |
| |
| 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 <poll.h> |
| #include <sys/socket.h> |
| |
| #include "sd-netlink.h" |
| |
| #include "alloc-util.h" |
| #include "fd-util.h" |
| #include "hashmap.h" |
| #include "macro.h" |
| #include "missing.h" |
| #include "netlink-internal.h" |
| #include "netlink-util.h" |
| #include "socket-util.h" |
| #include "util.h" |
| |
| static int sd_netlink_new(sd_netlink **ret) { |
| _cleanup_(sd_netlink_unrefp) sd_netlink *rtnl = NULL; |
| |
| assert_return(ret, -EINVAL); |
| |
| rtnl = new0(sd_netlink, 1); |
| if (!rtnl) |
| return -ENOMEM; |
| |
| rtnl->n_ref = REFCNT_INIT; |
| rtnl->fd = -1; |
| rtnl->sockaddr.nl.nl_family = AF_NETLINK; |
| rtnl->original_pid = getpid(); |
| |
| LIST_HEAD_INIT(rtnl->match_callbacks); |
| |
| /* We guarantee that the read buffer has at least space for |
| * a message header */ |
| if (!greedy_realloc((void**)&rtnl->rbuffer, &rtnl->rbuffer_allocated, |
| sizeof(struct nlmsghdr), sizeof(uint8_t))) |
| return -ENOMEM; |
| |
| /* Change notification responses have sequence 0, so we must |
| * start our request sequence numbers at 1, or we may confuse our |
| * responses with notifications from the kernel */ |
| rtnl->serial = 1; |
| |
| *ret = rtnl; |
| rtnl = NULL; |
| |
| return 0; |
| } |
| |
| int sd_netlink_new_from_netlink(sd_netlink **ret, int fd) { |
| _cleanup_(sd_netlink_unrefp) sd_netlink *rtnl = NULL; |
| socklen_t addrlen; |
| int r; |
| |
| assert_return(ret, -EINVAL); |
| |
| r = sd_netlink_new(&rtnl); |
| if (r < 0) |
| return r; |
| |
| addrlen = sizeof(rtnl->sockaddr); |
| |
| r = getsockname(fd, &rtnl->sockaddr.sa, &addrlen); |
| if (r < 0) |
| return -errno; |
| |
| if (rtnl->sockaddr.nl.nl_family != AF_NETLINK) |
| return -EINVAL; |
| |
| rtnl->fd = fd; |
| |
| *ret = rtnl; |
| rtnl = NULL; |
| |
| return 0; |
| } |
| |
| static bool rtnl_pid_changed(sd_netlink *rtnl) { |
| assert(rtnl); |
| |
| /* We don't support people creating an rtnl connection and |
| * keeping it around over a fork(). Let's complain. */ |
| |
| return rtnl->original_pid != getpid(); |
| } |
| |
| int sd_netlink_open_fd(sd_netlink **ret, int fd) { |
| _cleanup_(sd_netlink_unrefp) sd_netlink *rtnl = NULL; |
| int r; |
| |
| assert_return(ret, -EINVAL); |
| assert_return(fd >= 0, -EBADF); |
| |
| r = sd_netlink_new(&rtnl); |
| if (r < 0) |
| return r; |
| |
| rtnl->fd = fd; |
| |
| r = socket_bind(rtnl); |
| if (r < 0) { |
| rtnl->fd = -1; /* on failure, the caller remains owner of the fd, hence don't close it here */ |
| return r; |
| } |
| |
| *ret = rtnl; |
| rtnl = NULL; |
| |
| return 0; |
| } |
| |
| int sd_netlink_open(sd_netlink **ret) { |
| _cleanup_close_ int fd = -1; |
| int r; |
| |
| fd = socket_open(NETLINK_ROUTE); |
| if (fd < 0) |
| return fd; |
| |
| r = sd_netlink_open_fd(ret, fd); |
| if (r < 0) |
| return r; |
| |
| fd = -1; |
| |
| return 0; |
| } |
| |
| int sd_netlink_inc_rcvbuf(const sd_netlink *const rtnl, const int size) { |
| return fd_inc_rcvbuf(rtnl->fd, size); |
| } |
| |
| sd_netlink *sd_netlink_ref(sd_netlink *rtnl) { |
| assert_return(rtnl, NULL); |
| assert_return(!rtnl_pid_changed(rtnl), NULL); |
| |
| if (rtnl) |
| assert_se(REFCNT_INC(rtnl->n_ref) >= 2); |
| |
| return rtnl; |
| } |
| |
| sd_netlink *sd_netlink_unref(sd_netlink *rtnl) { |
| if (!rtnl) |
| return NULL; |
| |
| assert_return(!rtnl_pid_changed(rtnl), NULL); |
| |
| if (REFCNT_DEC(rtnl->n_ref) == 0) { |
| struct match_callback *f; |
| unsigned i; |
| |
| for (i = 0; i < rtnl->rqueue_size; i++) |
| sd_netlink_message_unref(rtnl->rqueue[i]); |
| free(rtnl->rqueue); |
| |
| for (i = 0; i < rtnl->rqueue_partial_size; i++) |
| sd_netlink_message_unref(rtnl->rqueue_partial[i]); |
| free(rtnl->rqueue_partial); |
| |
| free(rtnl->rbuffer); |
| |
| hashmap_free_free(rtnl->reply_callbacks); |
| prioq_free(rtnl->reply_callbacks_prioq); |
| |
| sd_event_source_unref(rtnl->io_event_source); |
| sd_event_source_unref(rtnl->time_event_source); |
| sd_event_unref(rtnl->event); |
| |
| while ((f = rtnl->match_callbacks)) { |
| sd_netlink_remove_match(rtnl, f->type, f->callback, f->userdata); |
| } |
| |
| hashmap_free(rtnl->broadcast_group_refs); |
| |
| safe_close(rtnl->fd); |
| free(rtnl); |
| } |
| |
| return NULL; |
| } |
| |
| static void rtnl_seal_message(sd_netlink *rtnl, sd_netlink_message *m) { |
| assert(rtnl); |
| assert(!rtnl_pid_changed(rtnl)); |
| assert(m); |
| assert(m->hdr); |
| |
| /* don't use seq == 0, as that is used for broadcasts, so we |
| would get confused by replies to such messages */ |
| m->hdr->nlmsg_seq = rtnl->serial++ ? : rtnl->serial++; |
| |
| rtnl_message_seal(m); |
| |
| return; |
| } |
| |
| int sd_netlink_send(sd_netlink *nl, |
| sd_netlink_message *message, |
| uint32_t *serial) { |
| int r; |
| |
| assert_return(nl, -EINVAL); |
| assert_return(!rtnl_pid_changed(nl), -ECHILD); |
| assert_return(message, -EINVAL); |
| assert_return(!message->sealed, -EPERM); |
| |
| rtnl_seal_message(nl, message); |
| |
| r = socket_write_message(nl, message); |
| if (r < 0) |
| return r; |
| |
| if (serial) |
| *serial = rtnl_message_get_serial(message); |
| |
| return 1; |
| } |
| |
| int rtnl_rqueue_make_room(sd_netlink *rtnl) { |
| assert(rtnl); |
| |
| if (rtnl->rqueue_size >= RTNL_RQUEUE_MAX) { |
| log_debug("rtnl: exhausted the read queue size (%d)", RTNL_RQUEUE_MAX); |
| return -ENOBUFS; |
| } |
| |
| if (!GREEDY_REALLOC(rtnl->rqueue, rtnl->rqueue_allocated, rtnl->rqueue_size + 1)) |
| return -ENOMEM; |
| |
| return 0; |
| } |
| |
| int rtnl_rqueue_partial_make_room(sd_netlink *rtnl) { |
| assert(rtnl); |
| |
| if (rtnl->rqueue_partial_size >= RTNL_RQUEUE_MAX) { |
| log_debug("rtnl: exhausted the partial read queue size (%d)", RTNL_RQUEUE_MAX); |
| return -ENOBUFS; |
| } |
| |
| if (!GREEDY_REALLOC(rtnl->rqueue_partial, rtnl->rqueue_partial_allocated, |
| rtnl->rqueue_partial_size + 1)) |
| return -ENOMEM; |
| |
| return 0; |
| } |
| |
| static int dispatch_rqueue(sd_netlink *rtnl, sd_netlink_message **message) { |
| int r; |
| |
| assert(rtnl); |
| assert(message); |
| |
| if (rtnl->rqueue_size <= 0) { |
| /* Try to read a new message */ |
| r = socket_read_message(rtnl); |
| if (r <= 0) |
| return r; |
| } |
| |
| /* Dispatch a queued message */ |
| *message = rtnl->rqueue[0]; |
| rtnl->rqueue_size --; |
| memmove(rtnl->rqueue, rtnl->rqueue + 1, sizeof(sd_netlink_message*) * rtnl->rqueue_size); |
| |
| return 1; |
| } |
| |
| static int process_timeout(sd_netlink *rtnl) { |
| _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL; |
| struct reply_callback *c; |
| usec_t n; |
| int r; |
| |
| assert(rtnl); |
| |
| c = prioq_peek(rtnl->reply_callbacks_prioq); |
| if (!c) |
| return 0; |
| |
| n = now(CLOCK_MONOTONIC); |
| if (c->timeout > n) |
| return 0; |
| |
| r = rtnl_message_new_synthetic_error(-ETIMEDOUT, c->serial, &m); |
| if (r < 0) |
| return r; |
| |
| assert_se(prioq_pop(rtnl->reply_callbacks_prioq) == c); |
| hashmap_remove(rtnl->reply_callbacks, &c->serial); |
| |
| r = c->callback(rtnl, m, c->userdata); |
| if (r < 0) |
| log_debug_errno(r, "sd-netlink: timedout callback failed: %m"); |
| |
| free(c); |
| |
| return 1; |
| } |
| |
| static int process_reply(sd_netlink *rtnl, sd_netlink_message *m) { |
| _cleanup_free_ struct reply_callback *c = NULL; |
| uint64_t serial; |
| uint16_t type; |
| int r; |
| |
| assert(rtnl); |
| assert(m); |
| |
| serial = rtnl_message_get_serial(m); |
| c = hashmap_remove(rtnl->reply_callbacks, &serial); |
| if (!c) |
| return 0; |
| |
| if (c->timeout != 0) |
| prioq_remove(rtnl->reply_callbacks_prioq, c, &c->prioq_idx); |
| |
| r = sd_netlink_message_get_type(m, &type); |
| if (r < 0) |
| return 0; |
| |
| if (type == NLMSG_DONE) |
| m = NULL; |
| |
| r = c->callback(rtnl, m, c->userdata); |
| if (r < 0) |
| log_debug_errno(r, "sd-netlink: callback failed: %m"); |
| |
| return 1; |
| } |
| |
| static int process_match(sd_netlink *rtnl, sd_netlink_message *m) { |
| struct match_callback *c; |
| uint16_t type; |
| int r; |
| |
| assert(rtnl); |
| assert(m); |
| |
| r = sd_netlink_message_get_type(m, &type); |
| if (r < 0) |
| return r; |
| |
| LIST_FOREACH(match_callbacks, c, rtnl->match_callbacks) { |
| if (type == c->type) { |
| r = c->callback(rtnl, m, c->userdata); |
| if (r != 0) { |
| if (r < 0) |
| log_debug_errno(r, "sd-netlink: match callback failed: %m"); |
| |
| break; |
| } |
| } |
| } |
| |
| return 1; |
| } |
| |
| static int process_running(sd_netlink *rtnl, sd_netlink_message **ret) { |
| _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL; |
| int r; |
| |
| assert(rtnl); |
| |
| r = process_timeout(rtnl); |
| if (r != 0) |
| goto null_message; |
| |
| r = dispatch_rqueue(rtnl, &m); |
| if (r < 0) |
| return r; |
| if (!m) |
| goto null_message; |
| |
| if (sd_netlink_message_is_broadcast(m)) { |
| r = process_match(rtnl, m); |
| if (r != 0) |
| goto null_message; |
| } else { |
| r = process_reply(rtnl, m); |
| if (r != 0) |
| goto null_message; |
| } |
| |
| if (ret) { |
| *ret = m; |
| m = NULL; |
| |
| return 1; |
| } |
| |
| return 1; |
| |
| null_message: |
| if (r >= 0 && ret) |
| *ret = NULL; |
| |
| return r; |
| } |
| |
| int sd_netlink_process(sd_netlink *rtnl, sd_netlink_message **ret) { |
| NETLINK_DONT_DESTROY(rtnl); |
| int r; |
| |
| assert_return(rtnl, -EINVAL); |
| assert_return(!rtnl_pid_changed(rtnl), -ECHILD); |
| assert_return(!rtnl->processing, -EBUSY); |
| |
| rtnl->processing = true; |
| r = process_running(rtnl, ret); |
| rtnl->processing = false; |
| |
| return r; |
| } |
| |
| static usec_t calc_elapse(uint64_t usec) { |
| if (usec == (uint64_t) -1) |
| return 0; |
| |
| if (usec == 0) |
| usec = RTNL_DEFAULT_TIMEOUT; |
| |
| return now(CLOCK_MONOTONIC) + usec; |
| } |
| |
| static int rtnl_poll(sd_netlink *rtnl, bool need_more, uint64_t timeout_usec) { |
| struct pollfd p[1] = {}; |
| struct timespec ts; |
| usec_t m = USEC_INFINITY; |
| int r, e; |
| |
| assert(rtnl); |
| |
| e = sd_netlink_get_events(rtnl); |
| if (e < 0) |
| return e; |
| |
| if (need_more) |
| /* Caller wants more data, and doesn't care about |
| * what's been read or any other timeouts. */ |
| e |= POLLIN; |
| else { |
| usec_t until; |
| /* Caller wants to process if there is something to |
| * process, but doesn't care otherwise */ |
| |
| r = sd_netlink_get_timeout(rtnl, &until); |
| if (r < 0) |
| return r; |
| if (r > 0) { |
| usec_t nw; |
| nw = now(CLOCK_MONOTONIC); |
| m = until > nw ? until - nw : 0; |
| } |
| } |
| |
| if (timeout_usec != (uint64_t) -1 && (m == (uint64_t) -1 || timeout_usec < m)) |
| m = timeout_usec; |
| |
| p[0].fd = rtnl->fd; |
| p[0].events = e; |
| |
| r = ppoll(p, 1, m == (uint64_t) -1 ? NULL : timespec_store(&ts, m), NULL); |
| if (r < 0) |
| return -errno; |
| |
| return r > 0 ? 1 : 0; |
| } |
| |
| int sd_netlink_wait(sd_netlink *nl, uint64_t timeout_usec) { |
| assert_return(nl, -EINVAL); |
| assert_return(!rtnl_pid_changed(nl), -ECHILD); |
| |
| if (nl->rqueue_size > 0) |
| return 0; |
| |
| return rtnl_poll(nl, false, timeout_usec); |
| } |
| |
| static int timeout_compare(const void *a, const void *b) { |
| const struct reply_callback *x = a, *y = b; |
| |
| if (x->timeout != 0 && y->timeout == 0) |
| return -1; |
| |
| if (x->timeout == 0 && y->timeout != 0) |
| return 1; |
| |
| if (x->timeout < y->timeout) |
| return -1; |
| |
| if (x->timeout > y->timeout) |
| return 1; |
| |
| return 0; |
| } |
| |
| int sd_netlink_call_async(sd_netlink *nl, |
| sd_netlink_message *m, |
| sd_netlink_message_handler_t callback, |
| void *userdata, |
| uint64_t usec, |
| uint32_t *serial) { |
| struct reply_callback *c; |
| uint32_t s; |
| int r, k; |
| |
| assert_return(nl, -EINVAL); |
| assert_return(m, -EINVAL); |
| assert_return(callback, -EINVAL); |
| assert_return(!rtnl_pid_changed(nl), -ECHILD); |
| |
| r = hashmap_ensure_allocated(&nl->reply_callbacks, &uint64_hash_ops); |
| if (r < 0) |
| return r; |
| |
| if (usec != (uint64_t) -1) { |
| r = prioq_ensure_allocated(&nl->reply_callbacks_prioq, timeout_compare); |
| if (r < 0) |
| return r; |
| } |
| |
| c = new0(struct reply_callback, 1); |
| if (!c) |
| return -ENOMEM; |
| |
| c->callback = callback; |
| c->userdata = userdata; |
| c->timeout = calc_elapse(usec); |
| |
| k = sd_netlink_send(nl, m, &s); |
| if (k < 0) { |
| free(c); |
| return k; |
| } |
| |
| c->serial = s; |
| |
| r = hashmap_put(nl->reply_callbacks, &c->serial, c); |
| if (r < 0) { |
| free(c); |
| return r; |
| } |
| |
| if (c->timeout != 0) { |
| r = prioq_put(nl->reply_callbacks_prioq, c, &c->prioq_idx); |
| if (r > 0) { |
| c->timeout = 0; |
| sd_netlink_call_async_cancel(nl, c->serial); |
| return r; |
| } |
| } |
| |
| if (serial) |
| *serial = s; |
| |
| return k; |
| } |
| |
| int sd_netlink_call_async_cancel(sd_netlink *nl, uint32_t serial) { |
| struct reply_callback *c; |
| uint64_t s = serial; |
| |
| assert_return(nl, -EINVAL); |
| assert_return(serial != 0, -EINVAL); |
| assert_return(!rtnl_pid_changed(nl), -ECHILD); |
| |
| c = hashmap_remove(nl->reply_callbacks, &s); |
| if (!c) |
| return 0; |
| |
| if (c->timeout != 0) |
| prioq_remove(nl->reply_callbacks_prioq, c, &c->prioq_idx); |
| |
| free(c); |
| return 1; |
| } |
| |
| int sd_netlink_call(sd_netlink *rtnl, |
| sd_netlink_message *message, |
| uint64_t usec, |
| sd_netlink_message **ret) { |
| usec_t timeout; |
| uint32_t serial; |
| int r; |
| |
| assert_return(rtnl, -EINVAL); |
| assert_return(!rtnl_pid_changed(rtnl), -ECHILD); |
| assert_return(message, -EINVAL); |
| |
| r = sd_netlink_send(rtnl, message, &serial); |
| if (r < 0) |
| return r; |
| |
| timeout = calc_elapse(usec); |
| |
| for (;;) { |
| usec_t left; |
| unsigned i; |
| |
| for (i = 0; i < rtnl->rqueue_size; i++) { |
| uint32_t received_serial; |
| |
| received_serial = rtnl_message_get_serial(rtnl->rqueue[i]); |
| |
| if (received_serial == serial) { |
| _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *incoming = NULL; |
| uint16_t type; |
| |
| incoming = rtnl->rqueue[i]; |
| |
| /* found a match, remove from rqueue and return it */ |
| memmove(rtnl->rqueue + i,rtnl->rqueue + i + 1, |
| sizeof(sd_netlink_message*) * (rtnl->rqueue_size - i - 1)); |
| rtnl->rqueue_size--; |
| |
| r = sd_netlink_message_get_errno(incoming); |
| if (r < 0) |
| return r; |
| |
| r = sd_netlink_message_get_type(incoming, &type); |
| if (r < 0) |
| return r; |
| |
| if (type == NLMSG_DONE) { |
| *ret = NULL; |
| return 0; |
| } |
| |
| if (ret) { |
| *ret = incoming; |
| incoming = NULL; |
| } |
| |
| return 1; |
| } |
| } |
| |
| r = socket_read_message(rtnl); |
| if (r < 0) |
| return r; |
| if (r > 0) |
| /* received message, so try to process straight away */ |
| continue; |
| |
| if (timeout > 0) { |
| usec_t n; |
| |
| n = now(CLOCK_MONOTONIC); |
| if (n >= timeout) |
| return -ETIMEDOUT; |
| |
| left = timeout - n; |
| } else |
| left = (uint64_t) -1; |
| |
| r = rtnl_poll(rtnl, true, left); |
| if (r < 0) |
| return r; |
| else if (r == 0) |
| return -ETIMEDOUT; |
| } |
| } |
| |
| int sd_netlink_get_events(sd_netlink *rtnl) { |
| assert_return(rtnl, -EINVAL); |
| assert_return(!rtnl_pid_changed(rtnl), -ECHILD); |
| |
| if (rtnl->rqueue_size == 0) |
| return POLLIN; |
| else |
| return 0; |
| } |
| |
| int sd_netlink_get_timeout(sd_netlink *rtnl, uint64_t *timeout_usec) { |
| struct reply_callback *c; |
| |
| assert_return(rtnl, -EINVAL); |
| assert_return(timeout_usec, -EINVAL); |
| assert_return(!rtnl_pid_changed(rtnl), -ECHILD); |
| |
| if (rtnl->rqueue_size > 0) { |
| *timeout_usec = 0; |
| return 1; |
| } |
| |
| c = prioq_peek(rtnl->reply_callbacks_prioq); |
| if (!c) { |
| *timeout_usec = (uint64_t) -1; |
| return 0; |
| } |
| |
| *timeout_usec = c->timeout; |
| |
| return 1; |
| } |
| |
| static int io_callback(sd_event_source *s, int fd, uint32_t revents, void *userdata) { |
| sd_netlink *rtnl = userdata; |
| int r; |
| |
| assert(rtnl); |
| |
| r = sd_netlink_process(rtnl, NULL); |
| if (r < 0) |
| return r; |
| |
| return 1; |
| } |
| |
| static int time_callback(sd_event_source *s, uint64_t usec, void *userdata) { |
| sd_netlink *rtnl = userdata; |
| int r; |
| |
| assert(rtnl); |
| |
| r = sd_netlink_process(rtnl, NULL); |
| if (r < 0) |
| return r; |
| |
| return 1; |
| } |
| |
| static int prepare_callback(sd_event_source *s, void *userdata) { |
| sd_netlink *rtnl = userdata; |
| int r, e; |
| usec_t until; |
| |
| assert(s); |
| assert(rtnl); |
| |
| e = sd_netlink_get_events(rtnl); |
| if (e < 0) |
| return e; |
| |
| r = sd_event_source_set_io_events(rtnl->io_event_source, e); |
| if (r < 0) |
| return r; |
| |
| r = sd_netlink_get_timeout(rtnl, &until); |
| if (r < 0) |
| return r; |
| if (r > 0) { |
| int j; |
| |
| j = sd_event_source_set_time(rtnl->time_event_source, until); |
| if (j < 0) |
| return j; |
| } |
| |
| r = sd_event_source_set_enabled(rtnl->time_event_source, r > 0); |
| if (r < 0) |
| return r; |
| |
| return 1; |
| } |
| |
| int sd_netlink_attach_event(sd_netlink *rtnl, sd_event *event, int priority) { |
| int r; |
| |
| assert_return(rtnl, -EINVAL); |
| assert_return(!rtnl->event, -EBUSY); |
| |
| assert(!rtnl->io_event_source); |
| assert(!rtnl->time_event_source); |
| |
| if (event) |
| rtnl->event = sd_event_ref(event); |
| else { |
| r = sd_event_default(&rtnl->event); |
| if (r < 0) |
| return r; |
| } |
| |
| r = sd_event_add_io(rtnl->event, &rtnl->io_event_source, rtnl->fd, 0, io_callback, rtnl); |
| if (r < 0) |
| goto fail; |
| |
| r = sd_event_source_set_priority(rtnl->io_event_source, priority); |
| if (r < 0) |
| goto fail; |
| |
| r = sd_event_source_set_description(rtnl->io_event_source, "rtnl-receive-message"); |
| if (r < 0) |
| goto fail; |
| |
| r = sd_event_source_set_prepare(rtnl->io_event_source, prepare_callback); |
| if (r < 0) |
| goto fail; |
| |
| r = sd_event_add_time(rtnl->event, &rtnl->time_event_source, CLOCK_MONOTONIC, 0, 0, time_callback, rtnl); |
| if (r < 0) |
| goto fail; |
| |
| r = sd_event_source_set_priority(rtnl->time_event_source, priority); |
| if (r < 0) |
| goto fail; |
| |
| r = sd_event_source_set_description(rtnl->time_event_source, "rtnl-timer"); |
| if (r < 0) |
| goto fail; |
| |
| return 0; |
| |
| fail: |
| sd_netlink_detach_event(rtnl); |
| return r; |
| } |
| |
| int sd_netlink_detach_event(sd_netlink *rtnl) { |
| assert_return(rtnl, -EINVAL); |
| assert_return(rtnl->event, -ENXIO); |
| |
| rtnl->io_event_source = sd_event_source_unref(rtnl->io_event_source); |
| |
| rtnl->time_event_source = sd_event_source_unref(rtnl->time_event_source); |
| |
| rtnl->event = sd_event_unref(rtnl->event); |
| |
| return 0; |
| } |
| |
| int sd_netlink_add_match(sd_netlink *rtnl, |
| uint16_t type, |
| sd_netlink_message_handler_t callback, |
| void *userdata) { |
| _cleanup_free_ struct match_callback *c = NULL; |
| int r; |
| |
| assert_return(rtnl, -EINVAL); |
| assert_return(callback, -EINVAL); |
| assert_return(!rtnl_pid_changed(rtnl), -ECHILD); |
| |
| c = new0(struct match_callback, 1); |
| if (!c) |
| return -ENOMEM; |
| |
| c->callback = callback; |
| c->type = type; |
| c->userdata = userdata; |
| |
| switch (type) { |
| case RTM_NEWLINK: |
| case RTM_DELLINK: |
| r = socket_broadcast_group_ref(rtnl, RTNLGRP_LINK); |
| if (r < 0) |
| return r; |
| |
| break; |
| case RTM_NEWADDR: |
| case RTM_DELADDR: |
| r = socket_broadcast_group_ref(rtnl, RTNLGRP_IPV4_IFADDR); |
| if (r < 0) |
| return r; |
| |
| r = socket_broadcast_group_ref(rtnl, RTNLGRP_IPV6_IFADDR); |
| if (r < 0) |
| return r; |
| |
| break; |
| case RTM_NEWROUTE: |
| case RTM_DELROUTE: |
| r = socket_broadcast_group_ref(rtnl, RTNLGRP_IPV4_ROUTE); |
| if (r < 0) |
| return r; |
| |
| r = socket_broadcast_group_ref(rtnl, RTNLGRP_IPV6_ROUTE); |
| if (r < 0) |
| return r; |
| break; |
| default: |
| return -EOPNOTSUPP; |
| } |
| |
| LIST_PREPEND(match_callbacks, rtnl->match_callbacks, c); |
| |
| c = NULL; |
| |
| return 0; |
| } |
| |
| int sd_netlink_remove_match(sd_netlink *rtnl, |
| uint16_t type, |
| sd_netlink_message_handler_t callback, |
| void *userdata) { |
| struct match_callback *c; |
| int r; |
| |
| assert_return(rtnl, -EINVAL); |
| assert_return(callback, -EINVAL); |
| assert_return(!rtnl_pid_changed(rtnl), -ECHILD); |
| |
| LIST_FOREACH(match_callbacks, c, rtnl->match_callbacks) |
| if (c->callback == callback && c->type == type && c->userdata == userdata) { |
| LIST_REMOVE(match_callbacks, rtnl->match_callbacks, c); |
| free(c); |
| |
| switch (type) { |
| case RTM_NEWLINK: |
| case RTM_DELLINK: |
| r = socket_broadcast_group_unref(rtnl, RTNLGRP_LINK); |
| if (r < 0) |
| return r; |
| |
| break; |
| case RTM_NEWADDR: |
| case RTM_DELADDR: |
| r = socket_broadcast_group_unref(rtnl, RTNLGRP_IPV4_IFADDR); |
| if (r < 0) |
| return r; |
| |
| r = socket_broadcast_group_unref(rtnl, RTNLGRP_IPV6_IFADDR); |
| if (r < 0) |
| return r; |
| |
| break; |
| case RTM_NEWROUTE: |
| case RTM_DELROUTE: |
| r = socket_broadcast_group_unref(rtnl, RTNLGRP_IPV4_ROUTE); |
| if (r < 0) |
| return r; |
| |
| r = socket_broadcast_group_unref(rtnl, RTNLGRP_IPV6_ROUTE); |
| if (r < 0) |
| return r; |
| break; |
| default: |
| return -EOPNOTSUPP; |
| } |
| |
| return 1; |
| } |
| |
| return 0; |
| } |