#include <sys/socket.h>
#include <poll.h>
+#include "missing.h"
#include "macro.h"
#include "util.h"
#include "hashmap.h"
if (!GREEDY_REALLOC(rtnl->wqueue, rtnl->wqueue_allocated, 1))
return -ENOMEM;
+ /* 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_rtnl_new_from_netlink(sd_rtnl **ret, int fd) {
+ _cleanup_rtnl_unref_ sd_rtnl *rtnl = NULL;
+ socklen_t addrlen;
+ int r;
+
+ assert_return(ret, -EINVAL);
+
+ r = sd_rtnl_new(&rtnl);
+ if (r < 0)
+ return r;
+
+ addrlen = sizeof(rtnl->sockaddr);
+
+ r = getsockname(fd, &rtnl->sockaddr.sa, &addrlen);
+ if (r < 0)
+ return -errno;
+
+ rtnl->fd = fd;
+
*ret = rtnl;
rtnl = NULL;
return rtnl->original_pid != getpid();
}
-int sd_rtnl_open(sd_rtnl **ret, uint32_t groups) {
+static int rtnl_compute_groups_ap(uint32_t *_groups, unsigned n_groups, va_list ap) {
+ uint32_t groups = 0;
+ unsigned i;
+
+ for (i = 0; i < n_groups; i++) {
+ unsigned group;
+
+ group = va_arg(ap, unsigned);
+ assert_return(group < 32, -EINVAL);
+
+ groups |= group ? (1 << (group - 1)) : 0;
+ }
+
+ *_groups = groups;
+
+ return 0;
+}
+
+static int rtnl_open_fd_ap(sd_rtnl **ret, int fd, unsigned n_groups, va_list ap) {
_cleanup_rtnl_unref_ sd_rtnl *rtnl = NULL;
socklen_t addrlen;
- int r;
+ int r, one = 1;
assert_return(ret, -EINVAL);
+ assert_return(fd >= 0, -EINVAL);
r = sd_rtnl_new(&rtnl);
if (r < 0)
return r;
- rtnl->fd = socket(PF_NETLINK, SOCK_RAW|SOCK_CLOEXEC|SOCK_NONBLOCK, NETLINK_ROUTE);
- if (rtnl->fd < 0)
+ r = setsockopt(fd, SOL_SOCKET, SO_PASSCRED, &one, sizeof(one));
+ if (r < 0)
+ return -errno;
+
+ r = setsockopt(fd, SOL_NETLINK, NETLINK_PKTINFO, &one, sizeof(one));
+ if (r < 0)
return -errno;
- rtnl->sockaddr.nl.nl_groups = groups;
+ r = rtnl_compute_groups_ap(&rtnl->sockaddr.nl.nl_groups, n_groups, ap);
+ if (r < 0)
+ return r;
addrlen = sizeof(rtnl->sockaddr);
- r = bind(rtnl->fd, &rtnl->sockaddr.sa, addrlen);
- if (r < 0)
+ r = bind(fd, &rtnl->sockaddr.sa, addrlen);
+ /* ignore EINVAL to allow opening an already bound socket */
+ if (r < 0 && errno != EINVAL)
return -errno;
- r = getsockname(rtnl->fd, &rtnl->sockaddr.sa, &addrlen);
+ r = getsockname(fd, &rtnl->sockaddr.sa, &addrlen);
if (r < 0)
- return r;
+ return -errno;
+
+ rtnl->fd = fd;
*ret = rtnl;
rtnl = NULL;
return 0;
}
+int sd_rtnl_open_fd(sd_rtnl **ret, int fd, unsigned n_groups, ...) {
+ va_list ap;
+ int r;
+
+ va_start(ap, n_groups);
+ r = rtnl_open_fd_ap(ret, fd, n_groups, ap);
+ va_end(ap);
+
+ return r;
+}
+
+int sd_rtnl_open(sd_rtnl **ret, unsigned n_groups, ...) {
+ va_list ap;
+ int fd, r;
+
+ fd = socket(PF_NETLINK, SOCK_RAW|SOCK_CLOEXEC|SOCK_NONBLOCK, NETLINK_ROUTE);
+ if (fd < 0)
+ return -errno;
+
+ va_start(ap, n_groups);
+ r = rtnl_open_fd_ap(ret, fd, n_groups, ap);
+ va_end(ap);
+
+ if (r < 0) {
+ safe_close(fd);
+ return r;
+ }
+
+ return 0;
+}
+
+int sd_rtnl_inc_rcvbuf(const sd_rtnl *const rtnl, const int size) {
+ return fd_inc_rcvbuf(rtnl->fd, size);
+}
+
sd_rtnl *sd_rtnl_ref(sd_rtnl *rtnl) {
assert_return(rtnl, NULL);
assert_return(!rtnl_pid_changed(rtnl), NULL);
assert_return(!rtnl_pid_changed(rtnl), NULL);
- if (REFCNT_DEC(rtnl->n_ref) <= 0) {
+ if (REFCNT_DEC(rtnl->n_ref) == 0) {
struct match_callback *f;
unsigned i;
sd_rtnl_message_unref(rtnl->rqueue[i]);
free(rtnl->rqueue);
+ for (i = 0; i < rtnl->rqueue_partial_size; i++)
+ sd_rtnl_message_unref(rtnl->rqueue_partial[i]);
+ free(rtnl->rqueue_partial);
+
for (i = 0; i < rtnl->wqueue_size; i++)
sd_rtnl_message_unref(rtnl->wqueue[i]);
free(rtnl->wqueue);
+ free(rtnl->rbuffer);
+
hashmap_free_free(rtnl->reply_callbacks);
prioq_free(rtnl->reply_callbacks_prioq);
assert(m);
assert(m->hdr);
- m->hdr->nlmsg_seq = rtnl->serial++;
+ /* 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);
}
} else {
/* append to queue */
- if (nl->wqueue_size >= RTNL_WQUEUE_MAX)
+ if (nl->wqueue_size >= RTNL_WQUEUE_MAX) {
+ log_debug("rtnl: exhausted the write queue size (%d)", RTNL_WQUEUE_MAX);
return -ENOBUFS;
+ }
if (!GREEDY_REALLOC(nl->wqueue, nl->wqueue_allocated, nl->wqueue_size + 1))
return -ENOMEM;
int rtnl_rqueue_make_room(sd_rtnl *rtnl) {
assert(rtnl);
- if (rtnl->rqueue_size >= RTNL_RQUEUE_MAX)
+ 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_rtnl *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_rtnl *rtnl, sd_rtnl_message **message) {
int r;
hashmap_remove(rtnl->reply_callbacks, &c->serial);
r = c->callback(rtnl, m, c->userdata);
+ if (r < 0)
+ log_debug_errno(r, "sd-rtnl: timedout callback failed: %m");
+
free(c);
- return r < 0 ? r : 1;
+ return 1;
}
static int process_reply(sd_rtnl *rtnl, sd_rtnl_message *m) {
- struct reply_callback *c;
+ _cleanup_free_ struct reply_callback *c = NULL;
uint64_t serial;
+ uint16_t type;
int r;
assert(rtnl);
assert(m);
- if (sd_rtnl_message_is_broadcast(m))
- return 0;
-
serial = rtnl_message_get_serial(m);
c = hashmap_remove(rtnl->reply_callbacks, &serial);
if (!c)
if (c->timeout != 0)
prioq_remove(rtnl->reply_callbacks_prioq, c, &c->prioq_idx);
+ r = sd_rtnl_message_get_type(m, &type);
+ if (r < 0)
+ return 0;
+
+ if (type == NLMSG_DONE)
+ m = NULL;
+
r = c->callback(rtnl, m, c->userdata);
- free(c);
+ if (r < 0)
+ log_debug_errno(r, "sd-rtnl: callback failed: %m");
- return r;
+ return 1;
}
static int process_match(sd_rtnl *rtnl, sd_rtnl_message *m) {
LIST_FOREACH(match_callbacks, c, rtnl->match_callbacks) {
if (type == c->type) {
r = c->callback(rtnl, m, c->userdata);
- if (r != 0)
- return r;
+ if (r != 0) {
+ if (r < 0)
+ log_debug_errno(r, "sd-rtnl: match callback failed: %m");
+
+ break;
+ }
}
}
- return 0;
+ return 1;
}
static int process_running(sd_rtnl *rtnl, sd_rtnl_message **ret) {
if (!m)
goto null_message;
- r = process_reply(rtnl, m);
- if (r != 0)
- goto null_message;
-
- r = process_match(rtnl, m);
- if (r != 0)
- goto null_message;
+ if (sd_rtnl_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;
static int rtnl_poll(sd_rtnl *rtnl, bool need_more, uint64_t timeout_usec) {
struct pollfd p[1] = {};
struct timespec ts;
- usec_t m = (usec_t) -1;
+ usec_t m = USEC_INFINITY;
int r, e;
assert(rtnl);
if (need_more)
/* Caller wants more data, and doesn't care about
* what's been read or any other timeouts. */
- return e |= POLLIN;
+ e |= POLLIN;
else {
usec_t until;
/* Caller wants to process if there is something to
assert_return(callback, -EINVAL);
assert_return(!rtnl_pid_changed(nl), -ECHILD);
- r = hashmap_ensure_allocated(&nl->reply_callbacks, uint64_hash_func, uint64_compare_func);
+ r = hashmap_ensure_allocated(&nl->reply_callbacks, &uint64_hash_ops);
if (r < 0)
return r;
sd_rtnl_message **ret) {
usec_t timeout;
uint32_t serial;
- unsigned i = 0;
int r;
assert_return(rtnl, -EINVAL);
for (;;) {
usec_t left;
+ unsigned i;
- while (i < rtnl->rqueue_size) {
- sd_rtnl_message *incoming;
+ for (i = 0; i < rtnl->rqueue_size; i++) {
uint32_t received_serial;
- incoming = rtnl->rqueue[i];
- received_serial = rtnl_message_get_serial(incoming);
+ received_serial = rtnl_message_get_serial(rtnl->rqueue[i]);
if (received_serial == serial) {
+ _cleanup_rtnl_message_unref_ sd_rtnl_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_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);
+ if (r < 0)
return r;
+
+ r = sd_rtnl_message_get_type(incoming, &type);
+ if (r < 0)
+ return r;
+
+ if (type == NLMSG_DONE) {
+ *ret = NULL;
+ return 0;
}
if (ret) {
*ret = incoming;
- } else
- sd_rtnl_message_unref(incoming);
+ incoming = NULL;
+ }
return 1;
}
-
- /* Try to read more, right away */
- i ++;
}
r = socket_read_message(rtnl);
if (r < 0)
return r;
if (r > 0)
- /* receieved message, so try to process straight away */
+ /* received message, so try to process straight away */
continue;
if (timeout > 0) {
r = rtnl_poll(rtnl, true, left);
if (r < 0)
return r;
+ else if (r == 0)
+ return -ETIMEDOUT;
r = dispatch_wqueue(rtnl);
if (r < 0)
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;
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:
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);
+ rtnl_message_type_is_route(type), -EOPNOTSUPP);
c = new0(struct match_callback, 1);
if (!c)
~ianmdlvl / elogind.git / blobdiff