| /* SPDX-License-Identifier: LGPL-2.1-or-later */ |
| |
| #include <poll.h> |
| |
| #include "sd-netlink.h" |
| |
| #include "alloc-util.h" |
| #include "fd-util.h" |
| #include "hashmap.h" |
| #include "io-util.h" |
| #include "macro.h" |
| #include "netlink-internal.h" |
| #include "netlink-slot.h" |
| #include "netlink-util.h" |
| #include "process-util.h" |
| #include "socket-util.h" |
| #include "string-util.h" |
| #include "util.h" |
| |
| /* Some really high limit, to catch programming errors */ |
| #define REPLY_CALLBACKS_MAX UINT16_MAX |
| |
| static int sd_netlink_new(sd_netlink **ret) { |
| _cleanup_(sd_netlink_unrefp) sd_netlink *rtnl = NULL; |
| |
| assert_return(ret, -EINVAL); |
| |
| rtnl = new(sd_netlink, 1); |
| if (!rtnl) |
| return -ENOMEM; |
| |
| *rtnl = (sd_netlink) { |
| .n_ref = 1, |
| .fd = -1, |
| .sockaddr.nl.nl_family = AF_NETLINK, |
| .original_pid = getpid_cached(), |
| .protocol = -1, |
| |
| /* Kernel change notification messages have sequence number 0. We want to avoid that with our |
| * own serials, in order not to get confused when matching up kernel replies to our earlier |
| * requests. |
| * |
| * Moreover, when using netlink socket activation (i.e. where PID 1 binds an AF_NETLINK |
| * socket for us and passes it to us across execve()) and we get restarted multiple times |
| * while the socket sticks around we might get confused by replies from earlier runs coming |
| * in late — which is pretty likely if we'd start our sequence numbers always from 1. Hence, |
| * let's start with a value based on the system clock. This should make collisions much less |
| * likely (though still theoretically possible). We use a 32 bit µs counter starting at boot |
| * for this (and explicitly exclude the zero, see above). This counter will wrap around after |
| * a bit more than 1h, but that's hopefully OK as the kernel shouldn't take that long to |
| * reply to our requests. |
| * |
| * We only pick the initial start value this way. For each message we simply increase the |
| * sequence number by 1. This means we could enqueue 1 netlink message per µs without risking |
| * collisions, which should be OK. |
| * |
| * Note this means the serials will be in the range 1…UINT32_MAX here. |
| * |
| * (In an ideal world we'd attach the current serial counter to the netlink socket itself |
| * somehow, to avoid all this, but I couldn't come up with a nice way to do this) */ |
| .serial = (uint32_t) (now(CLOCK_MONOTONIC) % UINT32_MAX) + 1, |
| }; |
| |
| /* We guarantee that the read buffer has at least space for |
| * a message header */ |
| if (!greedy_realloc((void**)&rtnl->rbuffer, sizeof(struct nlmsghdr), sizeof(uint8_t))) |
| return -ENOMEM; |
| |
| *ret = TAKE_PTR(rtnl); |
| |
| 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 = TAKE_PTR(rtnl); |
| |
| return 0; |
| } |
| |
| static bool rtnl_pid_changed(const 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_cached(); |
| } |
| |
| int sd_netlink_open_fd(sd_netlink **ret, int fd) { |
| _cleanup_(sd_netlink_unrefp) sd_netlink *rtnl = NULL; |
| int r, protocol; |
| |
| assert_return(ret, -EINVAL); |
| assert_return(fd >= 0, -EBADF); |
| |
| r = sd_netlink_new(&rtnl); |
| if (r < 0) |
| return r; |
| |
| r = getsockopt_int(fd, SOL_SOCKET, SO_PROTOCOL, &protocol); |
| if (r < 0) |
| return r; |
| |
| rtnl->fd = fd; |
| rtnl->protocol = protocol; |
| |
| r = setsockopt_int(fd, SOL_NETLINK, NETLINK_EXT_ACK, true); |
| if (r < 0) |
| log_debug_errno(r, "sd-netlink: Failed to enable NETLINK_EXT_ACK option, ignoring: %m"); |
| |
| r = setsockopt_int(fd, SOL_NETLINK, NETLINK_GET_STRICT_CHK, true); |
| if (r < 0) |
| log_debug_errno(r, "sd-netlink: Failed to enable NETLINK_GET_STRICT_CHK option, ignoring: %m"); |
| |
| r = systemd_socket_bind(rtnl); |
| if (r < 0) { |
| rtnl->fd = -1; /* on failure, the caller remains owner of the fd, hence don't close it here */ |
| rtnl->protocol = -1; |
| return r; |
| } |
| |
| *ret = TAKE_PTR(rtnl); |
| |
| return 0; |
| } |
| |
| int netlink_open_family(sd_netlink **ret, int family) { |
| _cleanup_close_ int fd = -1; |
| int r; |
| |
| fd = socket_open(family); |
| if (fd < 0) |
| return fd; |
| |
| r = sd_netlink_open_fd(ret, fd); |
| if (r < 0) |
| return r; |
| TAKE_FD(fd); |
| |
| return 0; |
| } |
| |
| int sd_netlink_open(sd_netlink **ret) { |
| return netlink_open_family(ret, NETLINK_ROUTE); |
| } |
| |
| int sd_netlink_inc_rcvbuf(sd_netlink *rtnl, size_t size) { |
| assert_return(rtnl, -EINVAL); |
| assert_return(!rtnl_pid_changed(rtnl), -ECHILD); |
| |
| return fd_inc_rcvbuf(rtnl->fd, size); |
| } |
| |
| static sd_netlink *netlink_free(sd_netlink *rtnl) { |
| sd_netlink_slot *s; |
| unsigned i; |
| |
| assert(rtnl); |
| |
| 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); |
| |
| while ((s = rtnl->slots)) { |
| assert(s->floating); |
| netlink_slot_disconnect(s, true); |
| } |
| hashmap_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); |
| |
| hashmap_free(rtnl->broadcast_group_refs); |
| |
| hashmap_free(rtnl->genl_family_to_nlmsg_type); |
| hashmap_free(rtnl->nlmsg_type_to_genl_family); |
| |
| safe_close(rtnl->fd); |
| return mfree(rtnl); |
| } |
| |
| DEFINE_TRIVIAL_REF_UNREF_FUNC(sd_netlink, sd_netlink, netlink_free); |
| |
| static void rtnl_seal_message(sd_netlink *rtnl, sd_netlink_message *m) { |
| uint32_t picked; |
| |
| assert(rtnl); |
| assert(!rtnl_pid_changed(rtnl)); |
| assert(m); |
| assert(m->hdr); |
| |
| /* Avoid collisions with outstanding requests */ |
| do { |
| picked = rtnl->serial; |
| |
| /* Don't use seq == 0, as that is used for broadcasts, so we would get confused by replies to |
| such messages */ |
| rtnl->serial = rtnl->serial == UINT32_MAX ? 1 : rtnl->serial + 1; |
| |
| } while (hashmap_contains(rtnl->reply_callbacks, UINT32_TO_PTR(picked))); |
| |
| m->hdr->nlmsg_seq = picked; |
| rtnl_message_seal(m); |
| } |
| |
| 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 sd_netlink_sendv( |
| sd_netlink *nl, |
| sd_netlink_message **messages, |
| size_t msgcount, |
| uint32_t **ret_serial) { |
| |
| _cleanup_free_ uint32_t *serials = NULL; |
| int r; |
| |
| assert_return(nl, -EINVAL); |
| assert_return(!rtnl_pid_changed(nl), -ECHILD); |
| assert_return(messages, -EINVAL); |
| assert_return(msgcount > 0, -EINVAL); |
| |
| if (ret_serial) { |
| serials = new(uint32_t, msgcount); |
| if (!serials) |
| return -ENOMEM; |
| } |
| |
| for (unsigned i = 0; i < msgcount; i++) { |
| assert_return(!messages[i]->sealed, -EPERM); |
| |
| rtnl_seal_message(nl, messages[i]); |
| if (serials) |
| serials[i] = rtnl_message_get_serial(messages[i]); |
| } |
| |
| r = socket_writev_message(nl, messages, msgcount); |
| if (r < 0) |
| return r; |
| |
| if (ret_serial) |
| *ret_serial = TAKE_PTR(serials); |
| |
| return r; |
| } |
| |
| int rtnl_rqueue_make_room(sd_netlink *rtnl) { |
| assert(rtnl); |
| |
| if (rtnl->rqueue_size >= RTNL_RQUEUE_MAX) |
| return log_debug_errno(SYNTHETIC_ERRNO(ENOBUFS), |
| "rtnl: exhausted the read queue size (%d)", |
| RTNL_RQUEUE_MAX); |
| |
| if (!GREEDY_REALLOC(rtnl->rqueue, 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) |
| return log_debug_errno(SYNTHETIC_ERRNO(ENOBUFS), |
| "rtnl: exhausted the partial read queue size (%d)", |
| RTNL_RQUEUE_MAX); |
| |
| if (!GREEDY_REALLOC(rtnl->rqueue_partial, 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 == -ENOBUFS) { /* FIXME: ignore buffer overruns for now */ |
| log_debug_errno(r, "Got ENOBUFS from netlink socket, ignoring."); |
| return 1; |
| } |
| 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; |
| sd_netlink_slot *slot; |
| 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(rtnl, -ETIMEDOUT, c->serial, &m); |
| if (r < 0) |
| return r; |
| |
| assert_se(prioq_pop(rtnl->reply_callbacks_prioq) == c); |
| c->timeout = 0; |
| hashmap_remove(rtnl->reply_callbacks, UINT32_TO_PTR(c->serial)); |
| |
| slot = container_of(c, sd_netlink_slot, reply_callback); |
| |
| r = c->callback(rtnl, m, slot->userdata); |
| if (r < 0) |
| log_debug_errno(r, "sd-netlink: timedout callback %s%s%sfailed: %m", |
| slot->description ? "'" : "", |
| strempty(slot->description), |
| slot->description ? "' " : ""); |
| |
| if (slot->floating) |
| netlink_slot_disconnect(slot, true); |
| |
| return 1; |
| } |
| |
| static int process_reply(sd_netlink *rtnl, sd_netlink_message *m) { |
| struct reply_callback *c; |
| sd_netlink_slot *slot; |
| uint32_t serial; |
| uint16_t type; |
| int r; |
| |
| assert(rtnl); |
| assert(m); |
| |
| serial = rtnl_message_get_serial(m); |
| c = hashmap_remove(rtnl->reply_callbacks, UINT32_TO_PTR(serial)); |
| if (!c) |
| return 0; |
| |
| if (c->timeout != 0) { |
| prioq_remove(rtnl->reply_callbacks_prioq, c, &c->prioq_idx); |
| c->timeout = 0; |
| } |
| |
| r = sd_netlink_message_get_type(m, &type); |
| if (r < 0) |
| return r; |
| |
| if (type == NLMSG_DONE) |
| m = NULL; |
| |
| slot = container_of(c, sd_netlink_slot, reply_callback); |
| |
| r = c->callback(rtnl, m, slot->userdata); |
| if (r < 0) |
| log_debug_errno(r, "sd-netlink: reply callback %s%s%sfailed: %m", |
| slot->description ? "'" : "", |
| strempty(slot->description), |
| slot->description ? "' " : ""); |
| |
| if (slot->floating) |
| netlink_slot_disconnect(slot, true); |
| |
| return 1; |
| } |
| |
| static int process_match(sd_netlink *rtnl, sd_netlink_message *m) { |
| struct match_callback *c; |
| sd_netlink_slot *slot; |
| 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) |
| continue; |
| |
| slot = container_of(c, sd_netlink_slot, match_callback); |
| |
| r = c->callback(rtnl, m, slot->userdata); |
| if (r < 0) |
| log_debug_errno(r, "sd-netlink: match callback %s%s%sfailed: %m", |
| slot->description ? "'" : "", |
| strempty(slot->description), |
| slot->description ? "' " : ""); |
| if (r != 0) |
| 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 = TAKE_PTR(m); |
| |
| 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_MAX) |
| return 0; |
| |
| if (usec == 0) |
| usec = RTNL_DEFAULT_TIMEOUT; |
| |
| return usec_add(now(CLOCK_MONOTONIC), usec); |
| } |
| |
| static int rtnl_poll(sd_netlink *rtnl, bool need_more, usec_t timeout_usec) { |
| 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; |
| |
| m = usec_sub_unsigned(until, now(CLOCK_MONOTONIC)); |
| } |
| |
| r = fd_wait_for_event(rtnl->fd, e, MIN(m, timeout_usec)); |
| if (r <= 0) |
| return r; |
| |
| return 1; |
| } |
| |
| 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; |
| |
| return CMP(x->timeout, y->timeout); |
| } |
| |
| int sd_netlink_call_async( |
| sd_netlink *nl, |
| sd_netlink_slot **ret_slot, |
| sd_netlink_message *m, |
| sd_netlink_message_handler_t callback, |
| sd_netlink_destroy_t destroy_callback, |
| void *userdata, |
| uint64_t usec, |
| const char *description) { |
| |
| _cleanup_free_ sd_netlink_slot *slot = NULL; |
| int r, k; |
| |
| assert_return(nl, -EINVAL); |
| assert_return(m, -EINVAL); |
| assert_return(callback, -EINVAL); |
| assert_return(!rtnl_pid_changed(nl), -ECHILD); |
| |
| if (hashmap_size(nl->reply_callbacks) >= REPLY_CALLBACKS_MAX) |
| return -ERANGE; |
| |
| r = hashmap_ensure_allocated(&nl->reply_callbacks, &trivial_hash_ops); |
| if (r < 0) |
| return r; |
| |
| if (usec != UINT64_MAX) { |
| r = prioq_ensure_allocated(&nl->reply_callbacks_prioq, timeout_compare); |
| if (r < 0) |
| return r; |
| } |
| |
| r = netlink_slot_allocate(nl, !ret_slot, NETLINK_REPLY_CALLBACK, sizeof(struct reply_callback), userdata, description, &slot); |
| if (r < 0) |
| return r; |
| |
| slot->reply_callback.callback = callback; |
| slot->reply_callback.timeout = calc_elapse(usec); |
| |
| k = sd_netlink_send(nl, m, &slot->reply_callback.serial); |
| if (k < 0) |
| return k; |
| |
| r = hashmap_put(nl->reply_callbacks, UINT32_TO_PTR(slot->reply_callback.serial), &slot->reply_callback); |
| if (r < 0) |
| return r; |
| |
| if (slot->reply_callback.timeout != 0) { |
| r = prioq_put(nl->reply_callbacks_prioq, &slot->reply_callback, &slot->reply_callback.prioq_idx); |
| if (r < 0) { |
| (void) hashmap_remove(nl->reply_callbacks, UINT32_TO_PTR(slot->reply_callback.serial)); |
| return r; |
| } |
| } |
| |
| /* Set this at last. Otherwise, some failures in above call the destroy callback but some do not. */ |
| slot->destroy_callback = destroy_callback; |
| |
| if (ret_slot) |
| *ret_slot = slot; |
| |
| TAKE_PTR(slot); |
| |
| return k; |
| } |
| |
| int sd_netlink_read( |
| sd_netlink *rtnl, |
| uint32_t serial, |
| uint64_t usec, |
| sd_netlink_message **ret) { |
| |
| usec_t timeout; |
| int r; |
| |
| assert_return(rtnl, -EINVAL); |
| assert_return(!rtnl_pid_changed(rtnl), -ECHILD); |
| |
| timeout = calc_elapse(usec); |
| |
| for (;;) { |
| usec_t left; |
| |
| for (unsigned i = 0; i < rtnl->rqueue_size; i++) { |
| _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *incoming = NULL; |
| uint32_t received_serial; |
| uint16_t type; |
| |
| received_serial = rtnl_message_get_serial(rtnl->rqueue[i]); |
| if (received_serial != serial) |
| continue; |
| |
| 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 = TAKE_PTR(incoming); |
| 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 = usec_sub_unsigned(timeout, n); |
| } else |
| left = USEC_INFINITY; |
| |
| r = rtnl_poll(rtnl, true, left); |
| if (r < 0) |
| return r; |
| if (r == 0) |
| return -ETIMEDOUT; |
| } |
| } |
| |
| int sd_netlink_call( |
| sd_netlink *rtnl, |
| sd_netlink_message *message, |
| uint64_t usec, |
| sd_netlink_message **ret) { |
| |
| 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; |
| |
| return sd_netlink_read(rtnl, serial, usec, ret); |
| } |
| |
| int sd_netlink_get_events(sd_netlink *rtnl) { |
| assert_return(rtnl, -EINVAL); |
| assert_return(!rtnl_pid_changed(rtnl), -ECHILD); |
| |
| return rtnl->rqueue_size == 0 ? POLLIN : 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_MAX; |
| 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, int64_t 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, |
| sd_netlink_slot **ret_slot, |
| uint16_t type, |
| sd_netlink_message_handler_t callback, |
| sd_netlink_destroy_t destroy_callback, |
| void *userdata, |
| const char *description) { |
| _cleanup_free_ sd_netlink_slot *slot = NULL; |
| int r; |
| |
| assert_return(rtnl, -EINVAL); |
| assert_return(callback, -EINVAL); |
| assert_return(!rtnl_pid_changed(rtnl), -ECHILD); |
| |
| r = netlink_slot_allocate(rtnl, !ret_slot, NETLINK_MATCH_CALLBACK, sizeof(struct match_callback), userdata, description, &slot); |
| if (r < 0) |
| return r; |
| |
| slot->match_callback.callback = callback; |
| slot->match_callback.type = type; |
| |
| 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_NEWNEIGH: |
| case RTM_DELNEIGH: |
| r = socket_broadcast_group_ref(rtnl, RTNLGRP_NEIGH); |
| 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; |
| case RTM_NEWRULE: |
| case RTM_DELRULE: |
| r = socket_broadcast_group_ref(rtnl, RTNLGRP_IPV4_RULE); |
| if (r < 0) |
| return r; |
| |
| r = socket_broadcast_group_ref(rtnl, RTNLGRP_IPV6_RULE); |
| if (r < 0) |
| return r; |
| break; |
| case RTM_NEWNEXTHOP: |
| case RTM_DELNEXTHOP: |
| r = socket_broadcast_group_ref(rtnl, RTNLGRP_NEXTHOP); |
| if (r < 0) |
| return r; |
| break; |
| |
| default: |
| return -EOPNOTSUPP; |
| } |
| |
| LIST_PREPEND(match_callbacks, rtnl->match_callbacks, &slot->match_callback); |
| |
| /* Set this at last. Otherwise, some failures in above call the destroy callback but some do not. */ |
| slot->destroy_callback = destroy_callback; |
| |
| if (ret_slot) |
| *ret_slot = slot; |
| |
| TAKE_PTR(slot); |
| |
| return 0; |
| } |
