1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
4 This file is part of systemd.
6 Copyright 2013 Lennart Poettering
8 systemd is free software; you can redistribute it and/or modify it
9 under the terms of the GNU Lesser General Public License as published by
10 the Free Software Foundation; either version 2.1 of the License, or
11 (at your option) any later version.
13 systemd is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 Lesser General Public License for more details.
18 You should have received a copy of the GNU Lesser General Public License
19 along with systemd; If not, see <http://www.gnu.org/licenses/>.
22 #ifdef HAVE_VALGRIND_MEMCHECK_H
23 #include <valgrind/memcheck.h>
30 #include <sys/prctl.h>
34 #include "memfd-util.h"
36 #include "bus-internal.h"
37 #include "bus-message.h"
38 #include "bus-kernel.h"
39 #include "bus-bloom.h"
41 #include "bus-label.h"
42 #include "cgroup-util.h"
44 #define UNIQUE_NAME_MAX (3+DECIMAL_STR_MAX(uint64_t))
46 int bus_kernel_parse_unique_name(const char *s, uint64_t *id) {
52 if (!startswith(s, ":1."))
55 r = safe_atou64(s + 3, id);
62 static void append_payload_vec(struct kdbus_item **d, const void *p, size_t sz) {
68 /* Note that p can be NULL, which encodes a region full of
69 * zeroes, which is useful to optimize certain padding
72 (*d)->size = offsetof(struct kdbus_item, vec) + sizeof(struct kdbus_vec);
73 (*d)->type = KDBUS_ITEM_PAYLOAD_VEC;
74 (*d)->vec.address = PTR_TO_UINT64(p);
77 *d = (struct kdbus_item *) ((uint8_t*) *d + (*d)->size);
80 static void append_payload_memfd(struct kdbus_item **d, int memfd, size_t sz) {
86 (*d)->size = offsetof(struct kdbus_item, memfd) + sizeof(struct kdbus_memfd);
87 (*d)->type = KDBUS_ITEM_PAYLOAD_MEMFD;
88 (*d)->memfd.fd = memfd;
89 (*d)->memfd.size = sz;
91 *d = (struct kdbus_item *) ((uint8_t*) *d + (*d)->size);
94 static void append_destination(struct kdbus_item **d, const char *s, size_t length) {
100 (*d)->size = offsetof(struct kdbus_item, str) + length + 1;
101 (*d)->type = KDBUS_ITEM_DST_NAME;
102 memcpy((*d)->str, s, length + 1);
104 *d = (struct kdbus_item *) ((uint8_t*) *d + (*d)->size);
107 static struct kdbus_bloom_filter *append_bloom(struct kdbus_item **d, size_t length) {
108 struct kdbus_item *i;
114 i->size = offsetof(struct kdbus_item, bloom_filter) +
115 offsetof(struct kdbus_bloom_filter, data) +
117 i->type = KDBUS_ITEM_BLOOM_FILTER;
119 *d = (struct kdbus_item *) ((uint8_t*) i + i->size);
121 return &i->bloom_filter;
124 static void append_fds(struct kdbus_item **d, const int fds[], unsigned n_fds) {
130 (*d)->size = offsetof(struct kdbus_item, fds) + sizeof(int) * n_fds;
131 (*d)->type = KDBUS_ITEM_FDS;
132 memcpy((*d)->fds, fds, sizeof(int) * n_fds);
134 *d = (struct kdbus_item *) ((uint8_t*) *d + (*d)->size);
137 static int bus_message_setup_bloom(sd_bus_message *m, struct kdbus_bloom_filter *bloom) {
146 memzero(data, m->bus->bloom_size);
147 bloom->generation = 0;
149 bloom_add_pair(data, m->bus->bloom_size, m->bus->bloom_n_hash, "message-type", bus_message_type_to_string(m->header->type));
152 bloom_add_pair(data, m->bus->bloom_size, m->bus->bloom_n_hash, "interface", m->interface);
154 bloom_add_pair(data, m->bus->bloom_size, m->bus->bloom_n_hash, "member", m->member);
156 bloom_add_pair(data, m->bus->bloom_size, m->bus->bloom_n_hash, "path", m->path);
157 bloom_add_pair(data, m->bus->bloom_size, m->bus->bloom_n_hash, "path-slash-prefix", m->path);
158 bloom_add_prefixes(data, m->bus->bloom_size, m->bus->bloom_n_hash, "path-slash-prefix", m->path, '/');
161 r = sd_bus_message_rewind(m, true);
165 for (i = 0; i < 64; i++) {
168 char buf[sizeof("arg")-1 + 2 + sizeof("-slash-prefix")];
171 r = sd_bus_message_peek_type(m, &type, NULL);
175 if (type != SD_BUS_TYPE_STRING &&
176 type != SD_BUS_TYPE_OBJECT_PATH &&
177 type != SD_BUS_TYPE_SIGNATURE)
180 r = sd_bus_message_read_basic(m, type, &t);
184 e = stpcpy(buf, "arg");
186 *(e++) = '0' + (char) i;
188 *(e++) = '0' + (char) (i / 10);
189 *(e++) = '0' + (char) (i % 10);
193 bloom_add_pair(data, m->bus->bloom_size, m->bus->bloom_n_hash, buf, t);
195 strcpy(e, "-dot-prefix");
196 bloom_add_prefixes(data, m->bus->bloom_size, m->bus->bloom_n_hash, buf, t, '.');
197 strcpy(e, "-slash-prefix");
198 bloom_add_prefixes(data, m->bus->bloom_size, m->bus->bloom_n_hash, buf, t, '/');
204 static int bus_message_setup_kmsg(sd_bus *b, sd_bus_message *m) {
205 struct bus_body_part *part;
206 struct kdbus_item *d;
207 const char *destination;
218 /* We put this together only once, if this message is reused
219 * we reuse the earlier-built version */
223 destination = m->destination ?: m->destination_ptr;
226 r = bus_kernel_parse_unique_name(destination, &unique);
234 sz = offsetof(struct kdbus_msg, items);
236 assert_cc(ALIGN8(offsetof(struct kdbus_item, vec) + sizeof(struct kdbus_vec)) ==
237 ALIGN8(offsetof(struct kdbus_item, memfd) + sizeof(struct kdbus_memfd)));
239 /* Add in fixed header, fields header and payload */
240 sz += (1 + m->n_body_parts) *
241 ALIGN8(offsetof(struct kdbus_item, vec) + sizeof(struct kdbus_vec));
243 /* Add space for bloom filter */
244 sz += ALIGN8(offsetof(struct kdbus_item, bloom_filter) +
245 offsetof(struct kdbus_bloom_filter, data) +
248 /* Add in well-known destination header */
250 dl = strlen(destination);
251 sz += ALIGN8(offsetof(struct kdbus_item, str) + dl + 1);
254 /* Add space for unix fds */
256 sz += ALIGN8(offsetof(struct kdbus_item, fds) + sizeof(int)*m->n_fds);
258 m->kdbus = memalign(8, sz);
264 m->free_kdbus = true;
265 memzero(m->kdbus, sz);
268 ((m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED) ? 0 : KDBUS_MSG_FLAGS_EXPECT_REPLY) |
269 ((m->header->flags & BUS_MESSAGE_NO_AUTO_START) ? KDBUS_MSG_FLAGS_NO_AUTO_START : 0);
272 /* verify_destination_id will usually be 0, which makes the kernel driver only look
273 * at the provided well-known name. Otherwise, the kernel will make sure the provided
274 * destination id matches the owner of the provided weel-known-name, and fail if they
275 * differ. Currently, this is only needed for bus-proxyd. */
276 m->kdbus->dst_id = m->verify_destination_id;
278 m->kdbus->dst_id = destination ? unique : KDBUS_DST_ID_BROADCAST;
281 m->kdbus->payload_type = KDBUS_PAYLOAD_DBUS;
282 m->kdbus->cookie = (uint64_t) m->header->serial;
283 m->kdbus->priority = m->priority;
285 if (m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED) {
286 m->kdbus->cookie_reply = m->reply_cookie;
290 assert_se(clock_gettime(CLOCK_MONOTONIC_COARSE, &now) == 0);
291 m->kdbus->timeout_ns = now.tv_sec * NSEC_PER_SEC + now.tv_nsec +
292 m->timeout * NSEC_PER_USEC;
298 append_destination(&d, destination, dl);
300 append_payload_vec(&d, m->header, BUS_MESSAGE_BODY_BEGIN(m));
302 MESSAGE_FOREACH_PART(part, i, m) {
304 /* If this is padding then simply send a
305 * vector with a NULL data pointer which the
306 * kernel will just pass through. This is the
307 * most efficient way to encode zeroes */
309 append_payload_vec(&d, NULL, part->size);
313 if (part->memfd >= 0 && part->sealed && destination) {
314 /* Try to send a memfd, if the part is
315 * sealed and this is not a broadcast. Since we can only */
317 append_payload_memfd(&d, part->memfd, part->size);
321 /* Otherwise, let's send a vector to the actual data.
322 * For that, we need to map it first. */
323 r = bus_body_part_map(part);
327 append_payload_vec(&d, part->data, part->size);
330 if (m->kdbus->dst_id == KDBUS_DST_ID_BROADCAST) {
331 struct kdbus_bloom_filter *bloom;
333 bloom = append_bloom(&d, m->bus->bloom_size);
334 r = bus_message_setup_bloom(m, bloom);
340 append_fds(&d, m->fds, m->n_fds);
342 m->kdbus->size = (uint8_t*) d - (uint8_t*) m->kdbus;
343 assert(m->kdbus->size <= sz);
352 static void unset_memfds(struct sd_bus_message *m) {
353 struct bus_body_part *part;
358 /* Make sure the memfds are not freed twice */
359 MESSAGE_FOREACH_PART(part, i, m)
360 if (part->memfd >= 0)
364 static int bus_kernel_make_message(sd_bus *bus, struct kdbus_msg *k) {
365 sd_bus_message *m = NULL;
366 struct kdbus_item *d;
368 _cleanup_free_ int *fds = NULL;
369 struct bus_header *h = NULL;
370 size_t total, n_bytes = 0, idx = 0;
371 const char *destination = NULL, *seclabel = NULL;
376 assert(k->payload_type == KDBUS_PAYLOAD_DBUS);
378 KDBUS_ITEM_FOREACH(d, k, items) {
381 l = d->size - offsetof(struct kdbus_item, data);
385 case KDBUS_ITEM_PAYLOAD_OFF:
387 h = (struct bus_header *)((uint8_t *)k + d->vec.offset);
389 if (!bus_header_is_complete(h, d->vec.size))
393 n_bytes += d->vec.size;
396 case KDBUS_ITEM_PAYLOAD_MEMFD:
400 n_bytes += d->memfd.size;
403 case KDBUS_ITEM_FDS: {
408 f = realloc(fds, sizeof(int) * (n_fds + j));
413 memcpy(fds + n_fds, d->fds, sizeof(int) * j);
418 case KDBUS_ITEM_SECLABEL:
427 r = bus_header_message_size(h, &total);
431 if (n_bytes != total)
434 /* on kdbus we only speak native endian gvariant, never dbus1
435 * marshalling or reverse endian */
436 if (h->version != 2 ||
437 h->endian != BUS_NATIVE_ENDIAN)
440 r = bus_message_from_header(bus, h, sizeof(struct bus_header), fds, n_fds, NULL, seclabel, 0, &m);
444 /* The well-known names list is different from the other
445 credentials. If we asked for it, but nothing is there, this
446 means that the list of well-known names is simply empty, not
447 that we lack any data */
449 m->creds.mask |= (SD_BUS_CREDS_UNIQUE_NAME|SD_BUS_CREDS_WELL_KNOWN_NAMES) & bus->creds_mask;
451 KDBUS_ITEM_FOREACH(d, k, items) {
454 l = d->size - offsetof(struct kdbus_item, data);
458 case KDBUS_ITEM_PAYLOAD_OFF: {
461 begin_body = BUS_MESSAGE_BODY_BEGIN(m);
463 if (idx + d->vec.size > begin_body) {
464 struct bus_body_part *part;
466 /* Contains body material */
468 part = message_append_part(m);
474 /* A -1 offset is NUL padding. */
475 part->is_zero = d->vec.offset == ~0ULL;
477 if (idx >= begin_body) {
479 part->data = (uint8_t *)k + d->vec.offset;
480 part->size = d->vec.size;
483 part->data = (uint8_t *)k + d->vec.offset + (begin_body - idx);
484 part->size = d->vec.size - (begin_body - idx);
494 case KDBUS_ITEM_PAYLOAD_MEMFD: {
495 struct bus_body_part *part;
497 if (idx < BUS_MESSAGE_BODY_BEGIN(m)) {
502 part = message_append_part(m);
508 part->memfd = d->memfd.fd;
509 part->size = d->memfd.size;
512 idx += d->memfd.size;
516 case KDBUS_ITEM_PIDS:
518 /* The PID starttime/TID might be missing,
519 * when the data is faked by some data bus
520 * proxy and it lacks that information about
521 * the real client since SO_PEERCRED is used
524 if (d->pids.pid > 0) {
525 m->creds.pid = (pid_t) d->pids.pid;
526 m->creds.mask |= SD_BUS_CREDS_PID & bus->creds_mask;
529 if (d->pids.starttime > 0) {
530 m->creds.pid_starttime = d->pids.starttime / NSEC_PER_USEC;
531 m->creds.mask |= SD_BUS_CREDS_PID_STARTTIME & bus->creds_mask;
534 if (d->pids.tid > 0) {
535 m->creds.tid = (pid_t) d->pids.tid;
536 m->creds.mask |= SD_BUS_CREDS_TID & bus->creds_mask;
541 case KDBUS_ITEM_CREDS:
543 /* EUID/SUID/FSUID/EGID/SGID/FSGID might be missing too (see above). */
545 if ((uid_t) d->creds.uid != (uid_t) -1) {
546 m->creds.uid = (uid_t) d->creds.uid;
547 m->creds.mask |= SD_BUS_CREDS_UID & bus->creds_mask;
550 if ((uid_t) d->creds.euid != (uid_t) -1) {
551 m->creds.euid = (uid_t) d->creds.euid;
552 m->creds.mask |= SD_BUS_CREDS_EUID & bus->creds_mask;
555 if ((uid_t) d->creds.suid != (uid_t) -1) {
556 m->creds.suid = (uid_t) d->creds.suid;
557 m->creds.mask |= SD_BUS_CREDS_SUID & bus->creds_mask;
560 if ((uid_t) d->creds.fsuid != (uid_t) -1) {
561 m->creds.fsuid = (uid_t) d->creds.fsuid;
562 m->creds.mask |= SD_BUS_CREDS_FSUID & bus->creds_mask;
565 if ((gid_t) d->creds.gid != (gid_t) -1) {
566 m->creds.gid = (gid_t) d->creds.gid;
567 m->creds.mask |= SD_BUS_CREDS_GID & bus->creds_mask;
570 if ((gid_t) d->creds.egid != (gid_t) -1) {
571 m->creds.egid = (gid_t) d->creds.egid;
572 m->creds.mask |= SD_BUS_CREDS_EGID & bus->creds_mask;
575 if ((gid_t) d->creds.sgid != (gid_t) -1) {
576 m->creds.sgid = (gid_t) d->creds.sgid;
577 m->creds.mask |= SD_BUS_CREDS_SGID & bus->creds_mask;
580 if ((gid_t) d->creds.fsgid != (gid_t) -1) {
581 m->creds.fsgid = (gid_t) d->creds.fsgid;
582 m->creds.mask |= SD_BUS_CREDS_FSGID & bus->creds_mask;
587 case KDBUS_ITEM_TIMESTAMP:
589 if (bus->attach_flags & KDBUS_ATTACH_TIMESTAMP) {
590 m->realtime = d->timestamp.realtime_ns / NSEC_PER_USEC;
591 m->monotonic = d->timestamp.monotonic_ns / NSEC_PER_USEC;
592 m->seqnum = d->timestamp.seqnum;
597 case KDBUS_ITEM_PID_COMM:
598 m->creds.comm = d->str;
599 m->creds.mask |= SD_BUS_CREDS_COMM & bus->creds_mask;
602 case KDBUS_ITEM_TID_COMM:
603 m->creds.tid_comm = d->str;
604 m->creds.mask |= SD_BUS_CREDS_TID_COMM & bus->creds_mask;
608 m->creds.exe = d->str;
609 m->creds.mask |= SD_BUS_CREDS_EXE & bus->creds_mask;
612 case KDBUS_ITEM_CMDLINE:
613 m->creds.cmdline = d->str;
614 m->creds.cmdline_size = l;
615 m->creds.mask |= SD_BUS_CREDS_CMDLINE & bus->creds_mask;
618 case KDBUS_ITEM_CGROUP:
619 m->creds.cgroup = d->str;
620 m->creds.mask |= (SD_BUS_CREDS_CGROUP|SD_BUS_CREDS_UNIT|SD_BUS_CREDS_USER_UNIT|SD_BUS_CREDS_SLICE|SD_BUS_CREDS_SESSION|SD_BUS_CREDS_OWNER_UID) & bus->creds_mask;
622 r = bus_get_root_path(bus);
626 m->creds.cgroup_root = bus->cgroup_root;
630 case KDBUS_ITEM_AUDIT:
631 if ((uint32_t) d->audit.sessionid != (uint32_t) -1) {
632 m->creds.audit_session_id = (uint32_t) d->audit.sessionid;
633 m->creds.mask |= SD_BUS_CREDS_AUDIT_SESSION_ID & bus->creds_mask;
636 if ((uid_t) d->audit.loginuid != (uid_t) -1) {
637 m->creds.audit_login_uid = (uid_t) d->audit.loginuid;
638 m->creds.mask |= SD_BUS_CREDS_AUDIT_LOGIN_UID & bus->creds_mask;
642 case KDBUS_ITEM_CAPS:
643 m->creds.capability = (uint8_t *) d->caps.caps;
644 m->creds.capability_size = d->size - offsetof(struct kdbus_item, caps.caps);
645 m->creds.mask |= (SD_BUS_CREDS_EFFECTIVE_CAPS|SD_BUS_CREDS_PERMITTED_CAPS|SD_BUS_CREDS_INHERITABLE_CAPS|SD_BUS_CREDS_BOUNDING_CAPS) & bus->creds_mask;
648 case KDBUS_ITEM_DST_NAME:
649 if (!service_name_is_valid(d->str)) {
654 destination = d->str;
657 case KDBUS_ITEM_OWNED_NAME:
658 if (!service_name_is_valid(d->name.name)) {
663 if (bus->creds_mask & SD_BUS_CREDS_WELL_KNOWN_NAMES) {
664 r = strv_extend(&m->creds.well_known_names, d->name.name);
668 m->creds.mask |= SD_BUS_CREDS_WELL_KNOWN_NAMES;
672 case KDBUS_ITEM_CONN_DESCRIPTION:
673 m->creds.description = d->str;
674 m->creds.mask |= SD_BUS_CREDS_DESCRIPTION & bus->creds_mask;
677 case KDBUS_ITEM_AUXGROUPS:
679 if (bus->creds_mask & SD_BUS_CREDS_SUPPLEMENTARY_GIDS) {
680 assert_cc(sizeof(gid_t) == sizeof(uint32_t));
682 m->creds.n_supplementary_gids = (d->size - offsetof(struct kdbus_item, data32)) / sizeof(uint32_t);
683 m->creds.supplementary_gids = (gid_t*) d->data32;
684 m->creds.mask |= SD_BUS_CREDS_SUPPLEMENTARY_GIDS;
690 case KDBUS_ITEM_SECLABEL:
694 log_debug("Got unknown field from kernel %llu", d->type);
698 r = bus_message_parse_fields(m);
702 /* Override information from the user header with data from the kernel */
703 if (k->src_id == KDBUS_SRC_ID_KERNEL)
704 m->sender = m->creds.unique_name = (char*) "org.freedesktop.DBus";
706 snprintf(m->sender_buffer, sizeof(m->sender_buffer), ":1.%llu", (unsigned long long) k->src_id);
707 m->sender = m->creds.unique_name = m->sender_buffer;
711 m->destination = destination;
712 else if (k->dst_id == KDBUS_DST_ID_BROADCAST)
713 m->destination = NULL;
714 else if (k->dst_id == KDBUS_DST_ID_NAME)
715 m->destination = bus->unique_name; /* fill in unique name if the well-known name is missing */
717 snprintf(m->destination_buffer, sizeof(m->destination_buffer), ":1.%llu", (unsigned long long) k->dst_id);
718 m->destination = m->destination_buffer;
721 /* We take possession of the kmsg struct now */
723 m->release_kdbus = true;
727 bus->rqueue[bus->rqueue_size++] = m;
733 sd_bus_message_unref(m);
738 int bus_kernel_take_fd(sd_bus *b) {
739 struct kdbus_cmd_hello *hello;
740 struct kdbus_item *item;
741 _cleanup_free_ char *g = NULL;
743 size_t l = 0, m = 0, sz;
753 if (b->description) {
754 g = bus_label_escape(b->description);
762 /* If no name is explicitly set, we'll include a hint
763 * indicating the library implementation, a hint which
764 * kind of bus this is and the thread name */
766 assert_se(prctl(PR_GET_NAME, (unsigned long) pr) >= 0);
769 name = b->is_system ? "sd-system" :
770 b->is_user ? "sd-user" : "sd";
772 _cleanup_free_ char *e = NULL;
774 e = bus_label_escape(pr);
778 g = strappend(b->is_system ? "sd-system-" :
779 b->is_user ? "sd-user-" : "sd-",
787 b->description = bus_label_unescape(name);
794 sz = ALIGN8(offsetof(struct kdbus_cmd_hello, items)) +
795 ALIGN8(offsetof(struct kdbus_item, str) + m + 1);
797 if (b->fake_creds_valid)
798 sz += ALIGN8(offsetof(struct kdbus_item, creds) + sizeof(struct kdbus_creds));
800 if (b->fake_pids_valid)
801 sz += ALIGN8(offsetof(struct kdbus_item, pids) + sizeof(struct kdbus_pids));
804 l = strlen(b->fake_label);
805 sz += ALIGN8(offsetof(struct kdbus_item, str) + l + 1);
808 hello = alloca0_align(sz, 8);
810 hello->flags = b->hello_flags;
811 hello->attach_flags_send = _KDBUS_ATTACH_ANY;
812 hello->attach_flags_recv = b->attach_flags;
813 hello->pool_size = KDBUS_POOL_SIZE;
817 item->size = offsetof(struct kdbus_item, str) + m + 1;
818 item->type = KDBUS_ITEM_CONN_DESCRIPTION;
819 memcpy(item->str, name, m + 1);
820 item = KDBUS_ITEM_NEXT(item);
822 if (b->fake_creds_valid) {
823 item->size = offsetof(struct kdbus_item, creds) + sizeof(struct kdbus_creds);
824 item->type = KDBUS_ITEM_CREDS;
825 item->creds = b->fake_creds;
827 item = KDBUS_ITEM_NEXT(item);
830 if (b->fake_pids_valid) {
831 item->size = offsetof(struct kdbus_item, pids) + sizeof(struct kdbus_pids);
832 item->type = KDBUS_ITEM_PIDS;
833 item->pids = b->fake_pids;
835 item = KDBUS_ITEM_NEXT(item);
839 item->size = offsetof(struct kdbus_item, str) + l + 1;
840 item->type = KDBUS_ITEM_SECLABEL;
841 memcpy(item->str, b->fake_label, l+1);
844 r = ioctl(b->input_fd, KDBUS_CMD_HELLO, hello);
848 if (!b->kdbus_buffer) {
849 b->kdbus_buffer = mmap(NULL, KDBUS_POOL_SIZE, PROT_READ, MAP_SHARED, b->input_fd, 0);
850 if (b->kdbus_buffer == MAP_FAILED) {
851 b->kdbus_buffer = NULL;
856 /* The higher 32bit of the bus_flags fields are considered
857 * 'incompatible flags'. Refuse them all for now. */
858 if (hello->bus_flags > 0xFFFFFFFFULL)
861 if (!bloom_validate_parameters((size_t) hello->bloom.size, (unsigned) hello->bloom.n_hash))
864 b->bloom_size = (size_t) hello->bloom.size;
865 b->bloom_n_hash = (unsigned) hello->bloom.n_hash;
867 if (asprintf(&b->unique_name, ":1.%llu", (unsigned long long) hello->id) < 0)
870 b->unique_id = hello->id;
873 b->bus_client = true;
874 b->can_fds = !!(hello->flags & KDBUS_HELLO_ACCEPT_FD);
875 b->message_version = 2;
876 b->message_endian = BUS_NATIVE_ENDIAN;
878 /* the kernel told us the UUID of the underlying bus */
879 memcpy(b->server_id.bytes, hello->id128, sizeof(b->server_id.bytes));
881 return bus_start_running(b);
884 int bus_kernel_connect(sd_bus *b) {
886 assert(b->input_fd < 0);
887 assert(b->output_fd < 0);
893 b->input_fd = open(b->kernel, O_RDWR|O_NOCTTY|O_CLOEXEC);
897 b->output_fd = b->input_fd;
899 return bus_kernel_take_fd(b);
902 static void close_kdbus_msg(sd_bus *bus, struct kdbus_msg *k) {
903 struct kdbus_cmd_free cmd = {};
904 struct kdbus_item *d;
909 cmd.offset = (uint8_t *)k - (uint8_t *)bus->kdbus_buffer;
911 KDBUS_ITEM_FOREACH(d, k, items) {
913 if (d->type == KDBUS_ITEM_FDS)
914 close_many(d->fds, (d->size - offsetof(struct kdbus_item, fds)) / sizeof(int));
915 else if (d->type == KDBUS_ITEM_PAYLOAD_MEMFD)
916 safe_close(d->memfd.fd);
919 (void) ioctl(bus->input_fd, KDBUS_CMD_FREE, &cmd);
922 int bus_kernel_write_message(sd_bus *bus, sd_bus_message *m, bool hint_sync_call) {
927 assert(bus->state == BUS_RUNNING);
929 /* If we can't deliver, we want room for the error message */
930 r = bus_rqueue_make_room(bus);
934 r = bus_message_setup_kmsg(bus, m);
938 /* If this is a synchronous method call, then let's tell the
939 * kernel, so that it can pass CPU time/scheduling to the
940 * destination for the time, if it wants to. If we
941 * synchronously wait for the result anyway, we won't need CPU
944 m->kdbus->flags |= KDBUS_MSG_FLAGS_EXPECT_REPLY|KDBUS_MSG_FLAGS_SYNC_REPLY;
946 r = ioctl(bus->output_fd, KDBUS_CMD_MSG_SEND, m->kdbus);
948 _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
949 sd_bus_message *reply;
951 if (errno == EAGAIN || errno == EINTR)
953 else if (errno == ENXIO || errno == ESRCH) {
955 /* ENXIO: unique name not known
956 * ESRCH: well-known name not known */
958 if (m->header->type == SD_BUS_MESSAGE_METHOD_CALL)
959 sd_bus_error_setf(&error, SD_BUS_ERROR_SERVICE_UNKNOWN, "Destination %s not known", m->destination);
961 log_debug("Could not deliver message to %s as destination is not known. Ignoring.", m->destination);
965 } else if (errno == EADDRNOTAVAIL) {
967 /* EADDRNOTAVAIL: activation is possible, but turned off in request flags */
969 if (m->header->type == SD_BUS_MESSAGE_METHOD_CALL)
970 sd_bus_error_setf(&error, SD_BUS_ERROR_SERVICE_UNKNOWN, "Activation of %s not requested", m->destination);
972 log_debug("Could not deliver message to %s as destination is not activated. Ignoring.", m->destination);
978 r = bus_message_new_synthetic_error(
980 BUS_MESSAGE_COOKIE(m),
987 r = bus_seal_synthetic_message(bus, reply);
991 bus->rqueue[bus->rqueue_size++] = reply;
993 } else if (hint_sync_call) {
996 k = (struct kdbus_msg *)((uint8_t *)bus->kdbus_buffer + m->kdbus->offset_reply);
999 if (k->payload_type == KDBUS_PAYLOAD_DBUS) {
1001 r = bus_kernel_make_message(bus, k);
1003 close_kdbus_msg(bus, k);
1005 /* Anybody can send us invalid messages, let's just drop them. */
1006 if (r == -EBADMSG || r == -EPROTOTYPE)
1007 log_debug("Ignoring invalid message: %s", strerror(-r));
1012 log_debug("Ignoring message with unknown payload type %llu.", (unsigned long long) k->payload_type);
1013 close_kdbus_msg(bus, k);
1020 static int push_name_owner_changed(sd_bus *bus, const char *name, const char *old_owner, const char *new_owner) {
1021 _cleanup_bus_message_unref_ sd_bus_message *m = NULL;
1026 r = sd_bus_message_new_signal(
1029 "/org/freedesktop/DBus",
1030 "org.freedesktop.DBus",
1031 "NameOwnerChanged");
1035 r = sd_bus_message_append(m, "sss", name, old_owner, new_owner);
1039 m->sender = "org.freedesktop.DBus";
1041 r = bus_seal_synthetic_message(bus, m);
1045 bus->rqueue[bus->rqueue_size++] = m;
1051 static int translate_name_change(sd_bus *bus, struct kdbus_msg *k, struct kdbus_item *d) {
1052 char new_owner[UNIQUE_NAME_MAX], old_owner[UNIQUE_NAME_MAX];
1058 if (d->type == KDBUS_ITEM_NAME_ADD || (d->name_change.old_id.flags & (KDBUS_NAME_IN_QUEUE|KDBUS_NAME_ACTIVATOR)))
1061 sprintf(old_owner, ":1.%llu", (unsigned long long) d->name_change.old_id.id);
1063 if (d->type == KDBUS_ITEM_NAME_REMOVE || (d->name_change.new_id.flags & (KDBUS_NAME_IN_QUEUE|KDBUS_NAME_ACTIVATOR))) {
1065 if (isempty(old_owner))
1070 sprintf(new_owner, ":1.%llu", (unsigned long long) d->name_change.new_id.id);
1072 return push_name_owner_changed(bus, d->name_change.name, old_owner, new_owner);
1075 static int translate_id_change(sd_bus *bus, struct kdbus_msg *k, struct kdbus_item *d) {
1076 char owner[UNIQUE_NAME_MAX];
1082 sprintf(owner, ":1.%llu", d->id_change.id);
1084 return push_name_owner_changed(
1086 d->type == KDBUS_ITEM_ID_ADD ? NULL : owner,
1087 d->type == KDBUS_ITEM_ID_ADD ? owner : NULL);
1090 static int translate_reply(sd_bus *bus, struct kdbus_msg *k, struct kdbus_item *d) {
1091 _cleanup_bus_message_unref_ sd_bus_message *m = NULL;
1098 r = bus_message_new_synthetic_error(
1101 d->type == KDBUS_ITEM_REPLY_TIMEOUT ?
1102 &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_NO_REPLY, "Method call timed out") :
1103 &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_NO_REPLY, "Method call peer died"),
1108 m->sender = "org.freedesktop.DBus";
1110 r = bus_seal_synthetic_message(bus, m);
1114 bus->rqueue[bus->rqueue_size++] = m;
1120 static int bus_kernel_translate_message(sd_bus *bus, struct kdbus_msg *k) {
1121 struct kdbus_item *d, *found = NULL;
1123 static int (* const translate[])(sd_bus *bus, struct kdbus_msg *k, struct kdbus_item *d) = {
1124 [KDBUS_ITEM_NAME_ADD - _KDBUS_ITEM_KERNEL_BASE] = translate_name_change,
1125 [KDBUS_ITEM_NAME_REMOVE - _KDBUS_ITEM_KERNEL_BASE] = translate_name_change,
1126 [KDBUS_ITEM_NAME_CHANGE - _KDBUS_ITEM_KERNEL_BASE] = translate_name_change,
1128 [KDBUS_ITEM_ID_ADD - _KDBUS_ITEM_KERNEL_BASE] = translate_id_change,
1129 [KDBUS_ITEM_ID_REMOVE - _KDBUS_ITEM_KERNEL_BASE] = translate_id_change,
1131 [KDBUS_ITEM_REPLY_TIMEOUT - _KDBUS_ITEM_KERNEL_BASE] = translate_reply,
1132 [KDBUS_ITEM_REPLY_DEAD - _KDBUS_ITEM_KERNEL_BASE] = translate_reply,
1137 assert(k->payload_type == KDBUS_PAYLOAD_KERNEL);
1139 KDBUS_ITEM_FOREACH(d, k, items) {
1140 if (d->type >= _KDBUS_ITEM_KERNEL_BASE && d->type < _KDBUS_ITEM_KERNEL_BASE + ELEMENTSOF(translate)) {
1145 log_debug("Got unknown field from kernel %llu", d->type);
1149 log_debug("Didn't find a kernel message to translate.");
1153 return translate[found->type - _KDBUS_ITEM_KERNEL_BASE](bus, k, found);
1156 int bus_kernel_read_message(sd_bus *bus, bool hint_priority, int64_t priority) {
1157 struct kdbus_cmd_recv recv = {};
1158 struct kdbus_msg *k;
1163 r = bus_rqueue_make_room(bus);
1167 if (hint_priority) {
1168 recv.flags |= KDBUS_RECV_USE_PRIORITY;
1169 recv.priority = priority;
1172 r = ioctl(bus->input_fd, KDBUS_CMD_MSG_RECV, &recv);
1174 if (errno == EAGAIN)
1177 if (errno == EOVERFLOW) {
1178 log_debug("%s: kdbus reports %" PRIu64 " dropped broadcast messages, ignoring.", strna(bus->description), (uint64_t) recv.dropped_msgs);
1185 k = (struct kdbus_msg *)((uint8_t *)bus->kdbus_buffer + recv.offset);
1186 if (k->payload_type == KDBUS_PAYLOAD_DBUS) {
1187 r = bus_kernel_make_message(bus, k);
1189 /* Anybody can send us invalid messages, let's just drop them. */
1190 if (r == -EBADMSG || r == -EPROTOTYPE) {
1191 log_debug("Ignoring invalid message: %s", strerror(-r));
1195 } else if (k->payload_type == KDBUS_PAYLOAD_KERNEL)
1196 r = bus_kernel_translate_message(bus, k);
1198 log_debug("Ignoring message with unknown payload type %llu.", (unsigned long long) k->payload_type);
1203 close_kdbus_msg(bus, k);
1205 return r < 0 ? r : 1;
1208 int bus_kernel_pop_memfd(sd_bus *bus, void **address, size_t *mapped, size_t *allocated) {
1209 struct memfd_cache *c;
1216 if (!bus || !bus->is_kernel)
1219 assert_se(pthread_mutex_lock(&bus->memfd_cache_mutex) >= 0);
1221 if (bus->n_memfd_cache <= 0) {
1224 assert_se(pthread_mutex_unlock(&bus->memfd_cache_mutex) >= 0);
1226 r = memfd_new(bus->description);
1236 c = &bus->memfd_cache[--bus->n_memfd_cache];
1239 assert(c->mapped == 0 || c->address);
1241 *address = c->address;
1242 *mapped = c->mapped;
1243 *allocated = c->allocated;
1246 assert_se(pthread_mutex_unlock(&bus->memfd_cache_mutex) >= 0);
1251 static void close_and_munmap(int fd, void *address, size_t size) {
1253 assert_se(munmap(address, PAGE_ALIGN(size)) >= 0);
1258 void bus_kernel_push_memfd(sd_bus *bus, int fd, void *address, size_t mapped, size_t allocated) {
1259 struct memfd_cache *c;
1260 uint64_t max_mapped = PAGE_ALIGN(MEMFD_CACHE_ITEM_SIZE_MAX);
1263 assert(mapped == 0 || address);
1265 if (!bus || !bus->is_kernel) {
1266 close_and_munmap(fd, address, mapped);
1270 assert_se(pthread_mutex_lock(&bus->memfd_cache_mutex) >= 0);
1272 if (bus->n_memfd_cache >= ELEMENTSOF(bus->memfd_cache)) {
1273 assert_se(pthread_mutex_unlock(&bus->memfd_cache_mutex) >= 0);
1275 close_and_munmap(fd, address, mapped);
1279 c = &bus->memfd_cache[bus->n_memfd_cache++];
1281 c->address = address;
1283 /* If overly long, let's return a bit to the OS */
1284 if (mapped > max_mapped) {
1285 assert_se(memfd_set_size(fd, max_mapped) >= 0);
1286 assert_se(munmap((uint8_t*) address + max_mapped, PAGE_ALIGN(mapped - max_mapped)) >= 0);
1287 c->mapped = c->allocated = max_mapped;
1290 c->allocated = allocated;
1293 assert_se(pthread_mutex_unlock(&bus->memfd_cache_mutex) >= 0);
1296 void bus_kernel_flush_memfd(sd_bus *b) {
1301 for (i = 0; i < b->n_memfd_cache; i++)
1302 close_and_munmap(b->memfd_cache[i].fd, b->memfd_cache[i].address, b->memfd_cache[i].mapped);
1305 uint64_t request_name_flags_to_kdbus(uint64_t flags) {
1308 if (flags & SD_BUS_NAME_ALLOW_REPLACEMENT)
1309 f |= KDBUS_NAME_ALLOW_REPLACEMENT;
1311 if (flags & SD_BUS_NAME_REPLACE_EXISTING)
1312 f |= KDBUS_NAME_REPLACE_EXISTING;
1314 if (flags & SD_BUS_NAME_QUEUE)
1315 f |= KDBUS_NAME_QUEUE;
1320 uint64_t attach_flags_to_kdbus(uint64_t mask) {
1323 if (mask & (SD_BUS_CREDS_UID|SD_BUS_CREDS_EUID|SD_BUS_CREDS_SUID|SD_BUS_CREDS_FSUID|
1324 SD_BUS_CREDS_GID|SD_BUS_CREDS_EGID|SD_BUS_CREDS_SGID|SD_BUS_CREDS_FSGID))
1325 m |= KDBUS_ATTACH_CREDS;
1327 if (mask & (SD_BUS_CREDS_PID|SD_BUS_CREDS_PID_STARTTIME|SD_BUS_CREDS_TID))
1328 m |= KDBUS_ATTACH_PIDS;
1330 if (mask & SD_BUS_CREDS_COMM)
1331 m |= KDBUS_ATTACH_PID_COMM;
1333 if (mask & SD_BUS_CREDS_TID_COMM)
1334 m |= KDBUS_ATTACH_TID_COMM;
1336 if (mask & SD_BUS_CREDS_EXE)
1337 m |= KDBUS_ATTACH_EXE;
1339 if (mask & SD_BUS_CREDS_CMDLINE)
1340 m |= KDBUS_ATTACH_CMDLINE;
1342 if (mask & (SD_BUS_CREDS_CGROUP|SD_BUS_CREDS_UNIT|SD_BUS_CREDS_USER_UNIT|SD_BUS_CREDS_SLICE|SD_BUS_CREDS_SESSION|SD_BUS_CREDS_OWNER_UID))
1343 m |= KDBUS_ATTACH_CGROUP;
1345 if (mask & (SD_BUS_CREDS_EFFECTIVE_CAPS|SD_BUS_CREDS_PERMITTED_CAPS|SD_BUS_CREDS_INHERITABLE_CAPS|SD_BUS_CREDS_BOUNDING_CAPS))
1346 m |= KDBUS_ATTACH_CAPS;
1348 if (mask & SD_BUS_CREDS_SELINUX_CONTEXT)
1349 m |= KDBUS_ATTACH_SECLABEL;
1351 if (mask & (SD_BUS_CREDS_AUDIT_SESSION_ID|SD_BUS_CREDS_AUDIT_LOGIN_UID))
1352 m |= KDBUS_ATTACH_AUDIT;
1354 if (mask & SD_BUS_CREDS_WELL_KNOWN_NAMES)
1355 m |= KDBUS_ATTACH_NAMES;
1357 if (mask & SD_BUS_CREDS_DESCRIPTION)
1358 m |= KDBUS_ATTACH_CONN_DESCRIPTION;
1360 if (mask & SD_BUS_CREDS_SUPPLEMENTARY_GIDS)
1361 m |= KDBUS_ATTACH_AUXGROUPS;
1366 int bus_kernel_create_bus(const char *name, bool world, char **s) {
1367 struct kdbus_cmd_make *make;
1368 struct kdbus_item *n;
1375 fd = open("/sys/fs/kdbus/control", O_RDWR|O_NOCTTY|O_CLOEXEC);
1380 make = alloca0_align(offsetof(struct kdbus_cmd_make, items) +
1381 ALIGN8(offsetof(struct kdbus_item, bloom_parameter) + sizeof(struct kdbus_bloom_parameter)) +
1382 ALIGN8(offsetof(struct kdbus_item, data64) + sizeof(uint64_t)) +
1383 ALIGN8(offsetof(struct kdbus_item, str) + DECIMAL_STR_MAX(uid_t) + 1 + l + 1),
1386 make->size = offsetof(struct kdbus_cmd_make, items);
1388 /* Set the bloom parameters */
1390 n->size = offsetof(struct kdbus_item, bloom_parameter) +
1391 sizeof(struct kdbus_bloom_parameter);
1392 n->type = KDBUS_ITEM_BLOOM_PARAMETER;
1393 n->bloom_parameter.size = DEFAULT_BLOOM_SIZE;
1394 n->bloom_parameter.n_hash = DEFAULT_BLOOM_N_HASH;
1396 assert_cc(DEFAULT_BLOOM_SIZE > 0);
1397 assert_cc(DEFAULT_BLOOM_N_HASH > 0);
1399 make->size += ALIGN8(n->size);
1401 /* The busses we create make no restrictions on what metadata
1402 * peers can read from incoming messages. */
1403 n = KDBUS_ITEM_NEXT(n);
1404 n->type = KDBUS_ITEM_ATTACH_FLAGS_RECV;
1405 n->size = offsetof(struct kdbus_item, data64) + sizeof(uint64_t);
1406 n->data64[0] = _KDBUS_ATTACH_ANY;
1407 make->size += ALIGN8(n->size);
1409 /* Set the a good name */
1410 n = KDBUS_ITEM_NEXT(n);
1411 sprintf(n->str, UID_FMT "-%s", getuid(), name);
1412 n->size = offsetof(struct kdbus_item, str) + strlen(n->str) + 1;
1413 n->type = KDBUS_ITEM_MAKE_NAME;
1414 make->size += ALIGN8(n->size);
1416 make->flags = world ? KDBUS_MAKE_ACCESS_WORLD : 0;
1418 if (ioctl(fd, KDBUS_CMD_BUS_MAKE, make) < 0) {
1426 p = strjoin("/sys/fs/kdbus/", n->str, "/bus", NULL);
1438 static int bus_kernel_translate_access(BusPolicyAccess access) {
1439 assert(access >= 0);
1440 assert(access < _BUS_POLICY_ACCESS_MAX);
1444 case BUS_POLICY_ACCESS_SEE:
1445 return KDBUS_POLICY_SEE;
1447 case BUS_POLICY_ACCESS_TALK:
1448 return KDBUS_POLICY_TALK;
1450 case BUS_POLICY_ACCESS_OWN:
1451 return KDBUS_POLICY_OWN;
1454 assert_not_reached("Unknown policy access");
1458 static int bus_kernel_translate_policy(const BusNamePolicy *policy, struct kdbus_item *item) {
1464 switch (policy->type) {
1466 case BUSNAME_POLICY_TYPE_USER: {
1467 const char *user = policy->name;
1470 r = get_user_creds(&user, &uid, NULL, NULL, NULL);
1474 item->policy_access.type = KDBUS_POLICY_ACCESS_USER;
1475 item->policy_access.id = uid;
1479 case BUSNAME_POLICY_TYPE_GROUP: {
1480 const char *group = policy->name;
1483 r = get_group_creds(&group, &gid);
1487 item->policy_access.type = KDBUS_POLICY_ACCESS_GROUP;
1488 item->policy_access.id = gid;
1493 assert_not_reached("Unknown policy type");
1496 item->policy_access.access = bus_kernel_translate_access(policy->access);
1501 int bus_kernel_open_bus_fd(const char *bus, char **path) {
1508 len = strlen("/sys/fs/kdbus/") + DECIMAL_STR_MAX(uid_t) + 1 + strlen(bus) + strlen("/bus") + 1;
1515 p = newa(char, len);
1517 sprintf(p, "/sys/fs/kdbus/" UID_FMT "-%s/bus", getuid(), bus);
1519 fd = open(p, O_RDWR|O_NOCTTY|O_CLOEXEC);
1533 int bus_kernel_create_endpoint(const char *bus_name, const char *ep_name, char **ep_path) {
1534 _cleanup_free_ char *path = NULL;
1535 struct kdbus_cmd_make *make;
1536 struct kdbus_item *n;
1540 fd = bus_kernel_open_bus_fd(bus_name, &path);
1544 size = ALIGN8(offsetof(struct kdbus_cmd_make, items));
1545 size += ALIGN8(offsetof(struct kdbus_item, str) + strlen(ep_name) + 1);
1547 make = alloca0_align(size, 8);
1549 make->flags = KDBUS_MAKE_ACCESS_WORLD;
1553 n->type = KDBUS_ITEM_MAKE_NAME;
1554 n->size = offsetof(struct kdbus_item, str) + strlen(ep_name) + 1;
1555 strcpy(n->str, ep_name);
1557 if (ioctl(fd, KDBUS_CMD_ENDPOINT_MAKE, make) < 0) {
1565 p = strjoin(dirname(path), "/", ep_name, NULL);
1577 int bus_kernel_set_endpoint_policy(int fd, uid_t uid, BusEndpoint *ep) {
1579 struct kdbus_cmd_update *update;
1580 struct kdbus_item *n;
1581 BusEndpointPolicy *po;
1586 size = ALIGN8(offsetof(struct kdbus_cmd_update, items));
1588 HASHMAP_FOREACH(po, ep->policy_hash, i) {
1589 size += ALIGN8(offsetof(struct kdbus_item, str) + strlen(po->name) + 1);
1590 size += ALIGN8(offsetof(struct kdbus_item, policy_access) + sizeof(struct kdbus_policy_access));
1593 update = alloca0_align(size, 8);
1594 update->size = size;
1598 HASHMAP_FOREACH(po, ep->policy_hash, i) {
1599 n->type = KDBUS_ITEM_NAME;
1600 n->size = offsetof(struct kdbus_item, str) + strlen(po->name) + 1;
1601 strcpy(n->str, po->name);
1602 n = KDBUS_ITEM_NEXT(n);
1604 n->type = KDBUS_ITEM_POLICY_ACCESS;
1605 n->size = offsetof(struct kdbus_item, policy_access) + sizeof(struct kdbus_policy_access);
1607 n->policy_access.type = KDBUS_POLICY_ACCESS_USER;
1608 n->policy_access.access = bus_kernel_translate_access(po->access);
1609 n->policy_access.id = uid;
1611 n = KDBUS_ITEM_NEXT(n);
1614 r = ioctl(fd, KDBUS_CMD_ENDPOINT_UPDATE, update);
1621 int bus_kernel_make_starter(
1626 BusNamePolicy *policy,
1627 BusPolicyAccess world_policy) {
1629 struct kdbus_cmd_hello *hello;
1630 struct kdbus_item *n;
1631 size_t policy_cnt = 0;
1639 LIST_FOREACH(policy, po, policy)
1642 if (world_policy >= 0)
1645 size = offsetof(struct kdbus_cmd_hello, items) +
1646 ALIGN8(offsetof(struct kdbus_item, str) + strlen(name) + 1) +
1647 policy_cnt * ALIGN8(offsetof(struct kdbus_item, policy_access) + sizeof(struct kdbus_policy_access));
1649 hello = alloca0_align(size, 8);
1652 strcpy(n->str, name);
1653 n->size = offsetof(struct kdbus_item, str) + strlen(n->str) + 1;
1654 n->type = KDBUS_ITEM_NAME;
1655 n = KDBUS_ITEM_NEXT(n);
1657 LIST_FOREACH(policy, po, policy) {
1658 n->type = KDBUS_ITEM_POLICY_ACCESS;
1659 n->size = offsetof(struct kdbus_item, policy_access) + sizeof(struct kdbus_policy_access);
1661 r = bus_kernel_translate_policy(po, n);
1665 n = KDBUS_ITEM_NEXT(n);
1668 if (world_policy >= 0) {
1669 n->type = KDBUS_ITEM_POLICY_ACCESS;
1670 n->size = offsetof(struct kdbus_item, policy_access) + sizeof(struct kdbus_policy_access);
1671 n->policy_access.type = KDBUS_POLICY_ACCESS_WORLD;
1672 n->policy_access.access = bus_kernel_translate_access(world_policy);
1677 (activating ? KDBUS_HELLO_ACTIVATOR : KDBUS_HELLO_POLICY_HOLDER) |
1678 (accept_fd ? KDBUS_HELLO_ACCEPT_FD : 0);
1679 hello->pool_size = KDBUS_POOL_SIZE;
1680 hello->attach_flags_send = _KDBUS_ATTACH_ANY;
1681 hello->attach_flags_recv = _KDBUS_ATTACH_ANY;
1683 if (ioctl(fd, KDBUS_CMD_HELLO, hello) < 0)
1686 /* The higher 32bit of the bus_flags fields are considered
1687 * 'incompatible flags'. Refuse them all for now. */
1688 if (hello->bus_flags > 0xFFFFFFFFULL)
1691 if (!bloom_validate_parameters((size_t) hello->bloom.size, (unsigned) hello->bloom.n_hash))
1697 int bus_kernel_try_close(sd_bus *bus) {
1699 assert(bus->is_kernel);
1701 if (ioctl(bus->input_fd, KDBUS_CMD_BYEBYE) < 0)
1707 int bus_kernel_drop_one(int fd) {
1708 struct kdbus_cmd_recv recv = {
1709 .flags = KDBUS_RECV_DROP
1714 if (ioctl(fd, KDBUS_CMD_MSG_RECV, &recv) < 0)
1720 int bus_kernel_realize_attach_flags(sd_bus *bus) {
1721 struct kdbus_cmd_update *update;
1722 struct kdbus_item *n;
1725 assert(bus->is_kernel);
1727 update = alloca0_align(offsetof(struct kdbus_cmd_update, items) +
1728 ALIGN8(offsetof(struct kdbus_item, data64) + sizeof(uint64_t)),
1732 n->type = KDBUS_ITEM_ATTACH_FLAGS_RECV;
1733 n->size = offsetof(struct kdbus_item, data64) + sizeof(uint64_t);
1734 n->data64[0] = bus->attach_flags;
1737 offsetof(struct kdbus_cmd_update, items) +
1740 if (ioctl(bus->input_fd, KDBUS_CMD_CONN_UPDATE, update) < 0)