1030 lines
27 KiB
C
1030 lines
27 KiB
C
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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/***
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This file is part of systemd.
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Copyright 2013 Tom Gundersen <teg@jklm.no>
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <sys/socket.h>
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#include <poll.h>
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#include "missing.h"
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#include "macro.h"
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#include "util.h"
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#include "hashmap.h"
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#include "sd-rtnl.h"
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#include "rtnl-internal.h"
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#include "rtnl-util.h"
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static int sd_rtnl_new(sd_rtnl **ret) {
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_cleanup_rtnl_unref_ sd_rtnl *rtnl = NULL;
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assert_return(ret, -EINVAL);
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rtnl = new0(sd_rtnl, 1);
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if (!rtnl)
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return -ENOMEM;
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rtnl->n_ref = REFCNT_INIT;
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rtnl->fd = -1;
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rtnl->sockaddr.nl.nl_family = AF_NETLINK;
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rtnl->original_pid = getpid();
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LIST_HEAD_INIT(rtnl->match_callbacks);
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/* We guarantee that wqueue always has space for at least
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* one entry */
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if (!GREEDY_REALLOC(rtnl->wqueue, rtnl->wqueue_allocated, 1))
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return -ENOMEM;
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/* We guarantee that the read buffer has at least space for
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* a message header */
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if (!greedy_realloc((void**)&rtnl->rbuffer, &rtnl->rbuffer_allocated,
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sizeof(struct nlmsghdr), sizeof(uint8_t)))
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return -ENOMEM;
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*ret = rtnl;
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rtnl = NULL;
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return 0;
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}
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int sd_rtnl_new_from_netlink(sd_rtnl **ret, int fd) {
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_cleanup_rtnl_unref_ sd_rtnl *rtnl = NULL;
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socklen_t addrlen;
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int r;
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assert_return(ret, -EINVAL);
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r = sd_rtnl_new(&rtnl);
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if (r < 0)
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return r;
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addrlen = sizeof(rtnl->sockaddr);
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r = getsockname(fd, &rtnl->sockaddr.sa, &addrlen);
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if (r < 0)
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return -errno;
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rtnl->fd = fd;
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*ret = rtnl;
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rtnl = NULL;
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return 0;
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}
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static bool rtnl_pid_changed(sd_rtnl *rtnl) {
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assert(rtnl);
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/* We don't support people creating an rtnl connection and
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* keeping it around over a fork(). Let's complain. */
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return rtnl->original_pid != getpid();
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}
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static int rtnl_compute_groups_ap(uint32_t *_groups, unsigned n_groups, va_list ap) {
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uint32_t groups = 0;
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unsigned i;
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for (i = 0; i < n_groups; i++) {
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unsigned group;
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group = va_arg(ap, unsigned);
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assert_return(group < 32, -EINVAL);
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groups |= group ? (1 << (group - 1)) : 0;
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}
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*_groups = groups;
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return 0;
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}
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static int rtnl_open_fd_ap(sd_rtnl **ret, int fd, unsigned n_groups, va_list ap) {
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_cleanup_rtnl_unref_ sd_rtnl *rtnl = NULL;
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socklen_t addrlen;
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int r, one = 1;
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assert_return(ret, -EINVAL);
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assert_return(fd >= 0, -EINVAL);
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r = sd_rtnl_new(&rtnl);
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if (r < 0)
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return r;
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r = setsockopt(fd, SOL_SOCKET, SO_PASSCRED, &one, sizeof(one));
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if (r < 0)
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return -errno;
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r = setsockopt(fd, SOL_NETLINK, NETLINK_PKTINFO, &one, sizeof(one));
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if (r < 0)
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return -errno;
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r = rtnl_compute_groups_ap(&rtnl->sockaddr.nl.nl_groups, n_groups, ap);
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if (r < 0)
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return r;
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addrlen = sizeof(rtnl->sockaddr);
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r = bind(fd, &rtnl->sockaddr.sa, addrlen);
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if (r < 0)
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return -errno;
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r = getsockname(fd, &rtnl->sockaddr.sa, &addrlen);
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if (r < 0)
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return -errno;
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rtnl->fd = fd;
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*ret = rtnl;
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rtnl = NULL;
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return 0;
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}
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int sd_rtnl_open_fd(sd_rtnl **ret, int fd, unsigned n_groups, ...) {
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va_list ap;
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int r;
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va_start(ap, n_groups);
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r = rtnl_open_fd_ap(ret, fd, n_groups, ap);
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va_end(ap);
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return r;
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}
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int sd_rtnl_open(sd_rtnl **ret, unsigned n_groups, ...) {
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va_list ap;
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int fd, r;
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fd = socket(PF_NETLINK, SOCK_RAW|SOCK_CLOEXEC|SOCK_NONBLOCK, NETLINK_ROUTE);
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if (fd < 0)
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return -errno;
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va_start(ap, n_groups);
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r = rtnl_open_fd_ap(ret, fd, n_groups, ap);
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va_end(ap);
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if (r < 0) {
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safe_close(fd);
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return r;
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}
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return 0;
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}
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int sd_rtnl_inc_rcvbuf(const sd_rtnl *const rtnl, const int size) {
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return fd_inc_rcvbuf(rtnl->fd, size);
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}
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sd_rtnl *sd_rtnl_ref(sd_rtnl *rtnl) {
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assert_return(rtnl, NULL);
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assert_return(!rtnl_pid_changed(rtnl), NULL);
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if (rtnl)
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assert_se(REFCNT_INC(rtnl->n_ref) >= 2);
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return rtnl;
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}
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sd_rtnl *sd_rtnl_unref(sd_rtnl *rtnl) {
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if (!rtnl)
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return NULL;
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assert_return(!rtnl_pid_changed(rtnl), NULL);
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if (REFCNT_DEC(rtnl->n_ref) == 0) {
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struct match_callback *f;
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unsigned i;
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for (i = 0; i < rtnl->rqueue_size; i++)
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sd_rtnl_message_unref(rtnl->rqueue[i]);
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free(rtnl->rqueue);
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for (i = 0; i < rtnl->rqueue_partial_size; i++)
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sd_rtnl_message_unref(rtnl->rqueue_partial[i]);
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free(rtnl->rqueue_partial);
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for (i = 0; i < rtnl->wqueue_size; i++)
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sd_rtnl_message_unref(rtnl->wqueue[i]);
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free(rtnl->wqueue);
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free(rtnl->rbuffer);
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hashmap_free_free(rtnl->reply_callbacks);
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prioq_free(rtnl->reply_callbacks_prioq);
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sd_event_source_unref(rtnl->io_event_source);
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sd_event_source_unref(rtnl->time_event_source);
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sd_event_source_unref(rtnl->exit_event_source);
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sd_event_unref(rtnl->event);
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while ((f = rtnl->match_callbacks)) {
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LIST_REMOVE(match_callbacks, rtnl->match_callbacks, f);
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free(f);
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}
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safe_close(rtnl->fd);
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free(rtnl);
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}
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return NULL;
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}
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static void rtnl_seal_message(sd_rtnl *rtnl, sd_rtnl_message *m) {
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assert(rtnl);
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assert(!rtnl_pid_changed(rtnl));
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assert(m);
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assert(m->hdr);
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m->hdr->nlmsg_seq = rtnl->serial++;
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rtnl_message_seal(m);
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return;
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}
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int sd_rtnl_send(sd_rtnl *nl,
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sd_rtnl_message *message,
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uint32_t *serial) {
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int r;
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assert_return(nl, -EINVAL);
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assert_return(!rtnl_pid_changed(nl), -ECHILD);
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assert_return(message, -EINVAL);
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assert_return(!message->sealed, -EPERM);
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rtnl_seal_message(nl, message);
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if (nl->wqueue_size <= 0) {
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/* send directly */
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r = socket_write_message(nl, message);
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if (r < 0)
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return r;
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else if (r == 0) {
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/* nothing was sent, so let's put it on
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* the queue */
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nl->wqueue[0] = sd_rtnl_message_ref(message);
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nl->wqueue_size = 1;
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}
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} else {
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/* append to queue */
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if (nl->wqueue_size >= RTNL_WQUEUE_MAX) {
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log_debug("rtnl: exhausted the write queue size (%d)", RTNL_WQUEUE_MAX);
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return -ENOBUFS;
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}
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if (!GREEDY_REALLOC(nl->wqueue, nl->wqueue_allocated, nl->wqueue_size + 1))
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return -ENOMEM;
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nl->wqueue[nl->wqueue_size ++] = sd_rtnl_message_ref(message);
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}
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if (serial)
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*serial = rtnl_message_get_serial(message);
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return 1;
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}
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int rtnl_rqueue_make_room(sd_rtnl *rtnl) {
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assert(rtnl);
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if (rtnl->rqueue_size >= RTNL_RQUEUE_MAX) {
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log_debug("rtnl: exhausted the read queue size (%d)", RTNL_RQUEUE_MAX);
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return -ENOBUFS;
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}
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if (!GREEDY_REALLOC(rtnl->rqueue, rtnl->rqueue_allocated, rtnl->rqueue_size + 1))
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return -ENOMEM;
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return 0;
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}
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int rtnl_rqueue_partial_make_room(sd_rtnl *rtnl) {
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assert(rtnl);
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if (rtnl->rqueue_partial_size >= RTNL_RQUEUE_MAX) {
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log_debug("rtnl: exhausted the partial read queue size (%d)", RTNL_RQUEUE_MAX);
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return -ENOBUFS;
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}
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if (!GREEDY_REALLOC(rtnl->rqueue_partial, rtnl->rqueue_partial_allocated,
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rtnl->rqueue_partial_size + 1))
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return -ENOMEM;
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return 0;
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}
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static int dispatch_rqueue(sd_rtnl *rtnl, sd_rtnl_message **message) {
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int r;
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assert(rtnl);
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assert(message);
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if (rtnl->rqueue_size <= 0) {
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/* Try to read a new message */
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r = socket_read_message(rtnl);
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if (r <= 0)
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return r;
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}
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/* Dispatch a queued message */
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*message = rtnl->rqueue[0];
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rtnl->rqueue_size --;
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memmove(rtnl->rqueue, rtnl->rqueue + 1, sizeof(sd_rtnl_message*) * rtnl->rqueue_size);
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return 1;
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}
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static int dispatch_wqueue(sd_rtnl *rtnl) {
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int r, ret = 0;
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assert(rtnl);
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while (rtnl->wqueue_size > 0) {
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r = socket_write_message(rtnl, rtnl->wqueue[0]);
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if (r < 0)
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return r;
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else if (r == 0)
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/* Didn't do anything this time */
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return ret;
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else {
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/* see equivalent in sd-bus.c */
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sd_rtnl_message_unref(rtnl->wqueue[0]);
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rtnl->wqueue_size --;
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memmove(rtnl->wqueue, rtnl->wqueue + 1, sizeof(sd_rtnl_message*) * rtnl->wqueue_size);
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ret = 1;
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}
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}
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return ret;
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}
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static int process_timeout(sd_rtnl *rtnl) {
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_cleanup_rtnl_message_unref_ sd_rtnl_message *m = NULL;
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struct reply_callback *c;
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usec_t n;
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int r;
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assert(rtnl);
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c = prioq_peek(rtnl->reply_callbacks_prioq);
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if (!c)
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return 0;
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n = now(CLOCK_MONOTONIC);
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if (c->timeout > n)
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return 0;
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r = rtnl_message_new_synthetic_error(-ETIMEDOUT, c->serial, &m);
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if (r < 0)
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return r;
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assert_se(prioq_pop(rtnl->reply_callbacks_prioq) == c);
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hashmap_remove(rtnl->reply_callbacks, &c->serial);
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r = c->callback(rtnl, m, c->userdata);
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if (r < 0)
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log_debug_errno(r, "sd-rtnl: timedout callback failed: %m");
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free(c);
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return 1;
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}
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static int process_reply(sd_rtnl *rtnl, sd_rtnl_message *m) {
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struct reply_callback *c;
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uint64_t serial;
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int r;
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assert(rtnl);
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assert(m);
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if (sd_rtnl_message_is_broadcast(m))
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return 0;
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serial = rtnl_message_get_serial(m);
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c = hashmap_remove(rtnl->reply_callbacks, &serial);
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if (!c)
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return 0;
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if (c->timeout != 0)
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prioq_remove(rtnl->reply_callbacks_prioq, c, &c->prioq_idx);
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r = c->callback(rtnl, m, c->userdata);
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if (r < 0)
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log_debug_errno(r, "sd-rtnl: callback failed: %m");
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free(c);
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return 1;
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}
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static int process_match(sd_rtnl *rtnl, sd_rtnl_message *m) {
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struct match_callback *c;
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uint16_t type;
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int r;
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assert(rtnl);
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assert(m);
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r = sd_rtnl_message_get_type(m, &type);
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if (r < 0)
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return r;
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LIST_FOREACH(match_callbacks, c, rtnl->match_callbacks) {
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if (type == c->type) {
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r = c->callback(rtnl, m, c->userdata);
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if (r != 0) {
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if (r < 0)
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log_debug_errno(r, "sd-rtnl: match callback failed: %m");
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break;
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}
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}
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}
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return 1;
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}
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static int process_running(sd_rtnl *rtnl, sd_rtnl_message **ret) {
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_cleanup_rtnl_message_unref_ sd_rtnl_message *m = NULL;
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int r;
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assert(rtnl);
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r = process_timeout(rtnl);
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if (r != 0)
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goto null_message;
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r = dispatch_wqueue(rtnl);
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if (r != 0)
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goto null_message;
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r = dispatch_rqueue(rtnl, &m);
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if (r < 0)
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return r;
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if (!m)
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goto null_message;
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r = process_reply(rtnl, m);
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if (r != 0)
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goto null_message;
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r = process_match(rtnl, m);
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if (r != 0)
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goto null_message;
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if (ret) {
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*ret = m;
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m = NULL;
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return 1;
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}
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return 1;
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null_message:
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if (r >= 0 && ret)
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*ret = NULL;
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return r;
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}
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|
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int sd_rtnl_process(sd_rtnl *rtnl, sd_rtnl_message **ret) {
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RTNL_DONT_DESTROY(rtnl);
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int r;
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assert_return(rtnl, -EINVAL);
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assert_return(!rtnl_pid_changed(rtnl), -ECHILD);
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assert_return(!rtnl->processing, -EBUSY);
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rtnl->processing = true;
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r = process_running(rtnl, ret);
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rtnl->processing = false;
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return r;
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}
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|
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static usec_t calc_elapse(uint64_t usec) {
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if (usec == (uint64_t) -1)
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return 0;
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|
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if (usec == 0)
|
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usec = RTNL_DEFAULT_TIMEOUT;
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|
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return now(CLOCK_MONOTONIC) + usec;
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}
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|
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static int rtnl_poll(sd_rtnl *rtnl, bool need_more, uint64_t timeout_usec) {
|
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struct pollfd p[1] = {};
|
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struct timespec ts;
|
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usec_t m = USEC_INFINITY;
|
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int r, e;
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|
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assert(rtnl);
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e = sd_rtnl_get_events(rtnl);
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if (e < 0)
|
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return e;
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|
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if (need_more)
|
|
/* Caller wants more data, and doesn't care about
|
|
* what's been read or any other timeouts. */
|
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e |= POLLIN;
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else {
|
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usec_t until;
|
|
/* Caller wants to process if there is something to
|
|
* process, but doesn't care otherwise */
|
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|
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r = sd_rtnl_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_rtnl_wait(sd_rtnl *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_rtnl_call_async(sd_rtnl *nl,
|
|
sd_rtnl_message *m,
|
|
sd_rtnl_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_rtnl_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_rtnl_call_async_cancel(nl, c->serial);
|
|
return r;
|
|
}
|
|
}
|
|
|
|
if (serial)
|
|
*serial = s;
|
|
|
|
return k;
|
|
}
|
|
|
|
int sd_rtnl_call_async_cancel(sd_rtnl *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_rtnl_call(sd_rtnl *rtnl,
|
|
sd_rtnl_message *message,
|
|
uint64_t usec,
|
|
sd_rtnl_message **ret) {
|
|
usec_t timeout;
|
|
uint32_t serial;
|
|
unsigned i = 0;
|
|
int r;
|
|
|
|
assert_return(rtnl, -EINVAL);
|
|
assert_return(!rtnl_pid_changed(rtnl), -ECHILD);
|
|
assert_return(message, -EINVAL);
|
|
|
|
r = sd_rtnl_send(rtnl, message, &serial);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
timeout = calc_elapse(usec);
|
|
|
|
for (;;) {
|
|
usec_t left;
|
|
|
|
while (i < rtnl->rqueue_size) {
|
|
sd_rtnl_message *incoming;
|
|
uint32_t received_serial;
|
|
|
|
incoming = rtnl->rqueue[i];
|
|
received_serial = rtnl_message_get_serial(incoming);
|
|
|
|
if (received_serial == serial) {
|
|
/* found a match, remove from rqueue and return it */
|
|
memmove(rtnl->rqueue + i,rtnl->rqueue + i + 1,
|
|
sizeof(sd_rtnl_message*) * (rtnl->rqueue_size - i - 1));
|
|
rtnl->rqueue_size--;
|
|
|
|
r = sd_rtnl_message_get_errno(incoming);
|
|
if (r < 0) {
|
|
sd_rtnl_message_unref(incoming);
|
|
return r;
|
|
}
|
|
|
|
if (ret) {
|
|
*ret = incoming;
|
|
} else
|
|
sd_rtnl_message_unref(incoming);
|
|
|
|
return 1;
|
|
}
|
|
|
|
/* Try to read more, right away */
|
|
i ++;
|
|
}
|
|
|
|
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;
|
|
|
|
r = dispatch_wqueue(rtnl);
|
|
if (r < 0)
|
|
return r;
|
|
}
|
|
}
|
|
|
|
int sd_rtnl_flush(sd_rtnl *rtnl) {
|
|
int r;
|
|
|
|
assert_return(rtnl, -EINVAL);
|
|
assert_return(!rtnl_pid_changed(rtnl), -ECHILD);
|
|
|
|
if (rtnl->wqueue_size <= 0)
|
|
return 0;
|
|
|
|
for (;;) {
|
|
r = dispatch_wqueue(rtnl);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
if (rtnl->wqueue_size <= 0)
|
|
return 0;
|
|
|
|
r = rtnl_poll(rtnl, false, (uint64_t) -1);
|
|
if (r < 0)
|
|
return r;
|
|
}
|
|
}
|
|
|
|
int sd_rtnl_get_events(sd_rtnl *rtnl) {
|
|
int flags = 0;
|
|
|
|
assert_return(rtnl, -EINVAL);
|
|
assert_return(!rtnl_pid_changed(rtnl), -ECHILD);
|
|
|
|
if (rtnl->rqueue_size <= 0)
|
|
flags |= POLLIN;
|
|
if (rtnl->wqueue_size > 0)
|
|
flags |= POLLOUT;
|
|
|
|
return flags;
|
|
}
|
|
|
|
int sd_rtnl_get_timeout(sd_rtnl *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_rtnl *rtnl = userdata;
|
|
int r;
|
|
|
|
assert(rtnl);
|
|
|
|
r = sd_rtnl_process(rtnl, NULL);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int time_callback(sd_event_source *s, uint64_t usec, void *userdata) {
|
|
sd_rtnl *rtnl = userdata;
|
|
int r;
|
|
|
|
assert(rtnl);
|
|
|
|
r = sd_rtnl_process(rtnl, NULL);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int prepare_callback(sd_event_source *s, void *userdata) {
|
|
sd_rtnl *rtnl = userdata;
|
|
int r, e;
|
|
usec_t until;
|
|
|
|
assert(s);
|
|
assert(rtnl);
|
|
|
|
e = sd_rtnl_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_rtnl_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;
|
|
}
|
|
|
|
static int exit_callback(sd_event_source *event, void *userdata) {
|
|
sd_rtnl *rtnl = userdata;
|
|
|
|
assert(event);
|
|
|
|
sd_rtnl_flush(rtnl);
|
|
|
|
return 1;
|
|
}
|
|
|
|
int sd_rtnl_attach_event(sd_rtnl *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;
|
|
|
|
r = sd_event_add_exit(rtnl->event, &rtnl->exit_event_source, exit_callback, rtnl);
|
|
if (r < 0)
|
|
goto fail;
|
|
|
|
r = sd_event_source_set_description(rtnl->exit_event_source, "rtnl-exit");
|
|
if (r < 0)
|
|
goto fail;
|
|
|
|
return 0;
|
|
|
|
fail:
|
|
sd_rtnl_detach_event(rtnl);
|
|
return r;
|
|
}
|
|
|
|
int sd_rtnl_detach_event(sd_rtnl *rtnl) {
|
|
assert_return(rtnl, -EINVAL);
|
|
assert_return(rtnl->event, -ENXIO);
|
|
|
|
if (rtnl->io_event_source)
|
|
rtnl->io_event_source = sd_event_source_unref(rtnl->io_event_source);
|
|
|
|
if (rtnl->time_event_source)
|
|
rtnl->time_event_source = sd_event_source_unref(rtnl->time_event_source);
|
|
|
|
if (rtnl->exit_event_source)
|
|
rtnl->exit_event_source = sd_event_source_unref(rtnl->exit_event_source);
|
|
|
|
if (rtnl->event)
|
|
rtnl->event = sd_event_unref(rtnl->event);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int sd_rtnl_add_match(sd_rtnl *rtnl,
|
|
uint16_t type,
|
|
sd_rtnl_message_handler_t callback,
|
|
void *userdata) {
|
|
struct match_callback *c;
|
|
|
|
assert_return(rtnl, -EINVAL);
|
|
assert_return(callback, -EINVAL);
|
|
assert_return(!rtnl_pid_changed(rtnl), -ECHILD);
|
|
assert_return(rtnl_message_type_is_link(type) ||
|
|
rtnl_message_type_is_addr(type) ||
|
|
rtnl_message_type_is_route(type), -ENOTSUP);
|
|
|
|
c = new0(struct match_callback, 1);
|
|
if (!c)
|
|
return -ENOMEM;
|
|
|
|
c->callback = callback;
|
|
c->type = type;
|
|
c->userdata = userdata;
|
|
|
|
LIST_PREPEND(match_callbacks, rtnl->match_callbacks, c);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int sd_rtnl_remove_match(sd_rtnl *rtnl,
|
|
uint16_t type,
|
|
sd_rtnl_message_handler_t callback,
|
|
void *userdata) {
|
|
struct match_callback *c;
|
|
|
|
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);
|
|
|
|
return 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|