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>
32 #include "bus-internal.h"
33 #include "bus-message.h"
34 #include "bus-kernel.h"
35 #include "bus-bloom.h"
38 #define UNIQUE_NAME_MAX (3+DECIMAL_STR_MAX(uint64_t))
40 int bus_kernel_parse_unique_name(const char *s, uint64_t *id) {
46 if (!startswith(s, ":1."))
49 r = safe_atou64(s + 3, id);
56 static void append_payload_vec(struct kdbus_item **d, const void *p, size_t sz) {
62 /* Note that p can be NULL, which encodes a region full of
63 * zeroes, which is useful to optimize certain padding
66 (*d)->size = offsetof(struct kdbus_item, vec) + sizeof(struct kdbus_vec);
67 (*d)->type = KDBUS_ITEM_PAYLOAD_VEC;
68 (*d)->vec.address = PTR_TO_UINT64(p);
71 *d = (struct kdbus_item *) ((uint8_t*) *d + (*d)->size);
74 static void append_payload_memfd(struct kdbus_item **d, int memfd, size_t sz) {
80 (*d)->size = offsetof(struct kdbus_item, memfd) + sizeof(struct kdbus_memfd);
81 (*d)->type = KDBUS_ITEM_PAYLOAD_MEMFD;
82 (*d)->memfd.fd = memfd;
83 (*d)->memfd.size = sz;
85 *d = (struct kdbus_item *) ((uint8_t*) *d + (*d)->size);
88 static void append_destination(struct kdbus_item **d, const char *s, size_t length) {
94 (*d)->size = offsetof(struct kdbus_item, str) + length + 1;
95 (*d)->type = KDBUS_ITEM_DST_NAME;
96 memcpy((*d)->str, s, length + 1);
98 *d = (struct kdbus_item *) ((uint8_t*) *d + (*d)->size);
101 static void* append_bloom(struct kdbus_item **d, size_t length) {
108 (*d)->size = offsetof(struct kdbus_item, data) + length;
109 (*d)->type = KDBUS_ITEM_BLOOM;
112 *d = (struct kdbus_item *) ((uint8_t*) *d + (*d)->size);
117 static void append_fds(struct kdbus_item **d, const int fds[], unsigned n_fds) {
123 (*d)->size = offsetof(struct kdbus_item, fds) + sizeof(int) * n_fds;
124 (*d)->type = KDBUS_ITEM_FDS;
125 memcpy((*d)->fds, fds, sizeof(int) * n_fds);
127 *d = (struct kdbus_item *) ((uint8_t*) *d + (*d)->size);
130 static int bus_message_setup_bloom(sd_bus_message *m, void *bloom) {
137 memset(bloom, 0, BLOOM_SIZE);
139 bloom_add_pair(bloom, "message-type", bus_message_type_to_string(m->header->type));
142 bloom_add_pair(bloom, "interface", m->interface);
144 bloom_add_pair(bloom, "member", m->member);
146 bloom_add_pair(bloom, "path", m->path);
147 bloom_add_pair(bloom, "path-slash-prefix", m->path);
148 bloom_add_prefixes(bloom, "path-slash-prefix", m->path, '/');
151 r = sd_bus_message_rewind(m, true);
155 for (i = 0; i < 64; i++) {
158 char buf[sizeof("arg")-1 + 2 + sizeof("-slash-prefix")];
161 r = sd_bus_message_peek_type(m, &type, NULL);
165 if (type != SD_BUS_TYPE_STRING &&
166 type != SD_BUS_TYPE_OBJECT_PATH &&
167 type != SD_BUS_TYPE_SIGNATURE)
170 r = sd_bus_message_read_basic(m, type, &t);
174 e = stpcpy(buf, "arg");
178 *(e++) = '0' + (i / 10);
179 *(e++) = '0' + (i % 10);
183 bloom_add_pair(bloom, buf, t);
185 strcpy(e, "-dot-prefix");
186 bloom_add_prefixes(bloom, buf, t, '.');
187 strcpy(e, "-slash-prefix");
188 bloom_add_prefixes(bloom, buf, t, '/');
194 static int bus_message_setup_kmsg(sd_bus *b, sd_bus_message *m) {
195 struct bus_body_part *part;
196 struct kdbus_item *d;
210 if (m->destination) {
211 r = bus_kernel_parse_unique_name(m->destination, &unique);
219 sz = offsetof(struct kdbus_msg, items);
221 assert_cc(ALIGN8(offsetof(struct kdbus_item, vec) + sizeof(struct kdbus_vec)) ==
222 ALIGN8(offsetof(struct kdbus_item, memfd) + sizeof(struct kdbus_memfd)));
224 /* Add in fixed header, fields header and payload */
225 sz += (1 + m->n_body_parts) *
226 ALIGN8(offsetof(struct kdbus_item, vec) + sizeof(struct kdbus_vec));
228 /* Add space for bloom filter */
229 sz += ALIGN8(offsetof(struct kdbus_item, data) + BLOOM_SIZE);
231 /* Add in well-known destination header */
233 dl = strlen(m->destination);
234 sz += ALIGN8(offsetof(struct kdbus_item, str) + dl + 1);
237 /* Add space for unix fds */
239 sz += ALIGN8(offsetof(struct kdbus_item, fds) + sizeof(int)*m->n_fds);
241 m->kdbus = memalign(8, sz);
247 m->free_kdbus = true;
248 memset(m->kdbus, 0, sz);
251 ((m->header->flags & SD_BUS_MESSAGE_NO_REPLY_EXPECTED) ? 0 : KDBUS_MSG_FLAGS_EXPECT_REPLY) |
252 ((m->header->flags & SD_BUS_MESSAGE_NO_AUTO_START) ? KDBUS_MSG_FLAGS_NO_AUTO_START : 0);
255 m->destination ? unique : KDBUS_DST_ID_BROADCAST;
256 m->kdbus->payload_type = KDBUS_PAYLOAD_DBUS1;
257 m->kdbus->cookie = m->header->serial;
259 m->kdbus->timeout_ns = m->timeout * NSEC_PER_USEC;
264 append_destination(&d, m->destination, dl);
266 append_payload_vec(&d, m->header, BUS_MESSAGE_BODY_BEGIN(m));
268 MESSAGE_FOREACH_PART(part, i, m) {
270 /* If this is padding then simply send a
271 * vector with a NULL data pointer which the
272 * kernel will just pass through. This is the
273 * most efficient way to encode zeroes */
275 append_payload_vec(&d, NULL, part->size);
279 if (part->memfd >= 0 && part->sealed && m->destination) {
280 /* Try to send a memfd, if the part is
281 * sealed and this is not a broadcast. Since we can only */
283 append_payload_memfd(&d, part->memfd, part->size);
287 /* Otherwise let's send a vector to the actual data,
288 * for that we need to map it first. */
289 r = bus_body_part_map(part);
293 append_payload_vec(&d, part->data, part->size);
296 if (m->kdbus->dst_id == KDBUS_DST_ID_BROADCAST) {
299 p = append_bloom(&d, BLOOM_SIZE);
300 r = bus_message_setup_bloom(m, p);
306 append_fds(&d, m->fds, m->n_fds);
308 m->kdbus->size = (uint8_t*) d - (uint8_t*) m->kdbus;
309 assert(m->kdbus->size <= sz);
318 int bus_kernel_take_fd(sd_bus *b) {
319 struct kdbus_cmd_hello hello;
330 hello.size = sizeof(hello);
331 hello.conn_flags = b->hello_flags;
332 hello.attach_flags = b->attach_flags;
333 hello.pool_size = KDBUS_POOL_SIZE;
335 r = ioctl(b->input_fd, KDBUS_CMD_HELLO, &hello);
339 if (!b->kdbus_buffer) {
340 b->kdbus_buffer = mmap(NULL, KDBUS_POOL_SIZE, PROT_READ, MAP_SHARED, b->input_fd, 0);
341 if (b->kdbus_buffer == MAP_FAILED) {
342 b->kdbus_buffer = NULL;
347 /* The higher 32bit of both flags fields are considered
348 * 'incompatible flags'. Refuse them all for now. */
349 if (hello.bus_flags > 0xFFFFFFFFULL ||
350 hello.conn_flags > 0xFFFFFFFFULL)
353 if (hello.bloom_size != BLOOM_SIZE)
356 if (asprintf(&b->unique_name, ":1.%llu", (unsigned long long) hello.id) < 0)
360 b->bus_client = true;
361 b->can_fds = !!(hello.conn_flags & KDBUS_HELLO_ACCEPT_FD);
363 /* the kernel told us the UUID of the underlying bus */
364 memcpy(b->server_id.bytes, hello.id128, sizeof(b->server_id.bytes));
366 r = bus_start_running(b);
373 int bus_kernel_connect(sd_bus *b) {
375 assert(b->input_fd < 0);
376 assert(b->output_fd < 0);
382 b->input_fd = open(b->kernel, O_RDWR|O_NOCTTY|O_CLOEXEC);
386 b->output_fd = b->input_fd;
388 return bus_kernel_take_fd(b);
391 int bus_kernel_write_message(sd_bus *bus, sd_bus_message *m) {
396 assert(bus->state == BUS_RUNNING);
398 r = bus_message_setup_kmsg(bus, m);
402 r = ioctl(bus->output_fd, KDBUS_CMD_MSG_SEND, m->kdbus);
404 return errno == EAGAIN ? 0 : -errno;
409 static void close_kdbus_msg(sd_bus *bus, struct kdbus_msg *k) {
411 struct kdbus_item *d;
416 off = (uint8_t *)k - (uint8_t *)bus->kdbus_buffer;
417 ioctl(bus->input_fd, KDBUS_CMD_MSG_RELEASE, &off);
419 KDBUS_PART_FOREACH(d, k, items) {
421 if (d->type == KDBUS_ITEM_FDS)
422 close_many(d->fds, (d->size - offsetof(struct kdbus_item, fds)) / sizeof(int));
423 else if (d->type == KDBUS_ITEM_PAYLOAD_MEMFD)
424 close_nointr_nofail(d->memfd.fd);
428 static int push_name_owner_changed(sd_bus *bus, const char *name, const char *old_owner, const char *new_owner) {
429 _cleanup_bus_message_unref_ sd_bus_message *m = NULL;
434 r = sd_bus_message_new_signal(
436 "/org/freedesktop/DBus",
437 "org.freedesktop.DBus",
443 r = sd_bus_message_append(m, "sss", name, old_owner, new_owner);
447 m->sender = "org.freedesktop.DBus";
449 r = bus_seal_message(bus, m);
453 r = bus_rqueue_push(bus, m);
461 static int translate_name_change(sd_bus *bus, struct kdbus_msg *k, struct kdbus_item *d) {
462 char new_owner[UNIQUE_NAME_MAX], old_owner[UNIQUE_NAME_MAX];
468 if (d->name_change.flags != 0)
471 if (d->type == KDBUS_ITEM_NAME_ADD)
474 sprintf(old_owner, ":1.%llu", (unsigned long long) d->name_change.old_id);
476 if (d->type == KDBUS_ITEM_NAME_REMOVE)
479 sprintf(new_owner, ":1.%llu", (unsigned long long) d->name_change.new_id);
481 return push_name_owner_changed(bus, d->name_change.name, old_owner, new_owner);
484 static int translate_id_change(sd_bus *bus, struct kdbus_msg *k, struct kdbus_item *d) {
485 char owner[UNIQUE_NAME_MAX];
491 sprintf(owner, ":1.%llu", d->id_change.id);
493 return push_name_owner_changed(
495 d->type == KDBUS_ITEM_ID_ADD ? NULL : owner,
496 d->type == KDBUS_ITEM_ID_ADD ? owner : NULL);
499 static int translate_reply(sd_bus *bus, struct kdbus_msg *k, struct kdbus_item *d) {
500 _cleanup_bus_message_unref_ sd_bus_message *m = NULL;
507 r = bus_message_new_synthetic_error(
510 d->type == KDBUS_ITEM_REPLY_TIMEOUT ?
511 &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_NO_REPLY, "Method call timed out") :
512 &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_NO_REPLY, "Method call peer died"),
517 m->sender = "org.freedesktop.DBus";
519 r = bus_seal_message(bus, m);
523 r = bus_rqueue_push(bus, m);
531 static int bus_kernel_translate_message(sd_bus *bus, struct kdbus_msg *k) {
532 struct kdbus_item *d, *found = NULL;
534 static int (* const translate[])(sd_bus *bus, struct kdbus_msg *k, struct kdbus_item *d) = {
535 [KDBUS_ITEM_NAME_ADD - _KDBUS_ITEM_KERNEL_BASE] = translate_name_change,
536 [KDBUS_ITEM_NAME_REMOVE - _KDBUS_ITEM_KERNEL_BASE] = translate_name_change,
537 [KDBUS_ITEM_NAME_CHANGE - _KDBUS_ITEM_KERNEL_BASE] = translate_name_change,
539 [KDBUS_ITEM_ID_ADD - _KDBUS_ITEM_KERNEL_BASE] = translate_id_change,
540 [KDBUS_ITEM_ID_REMOVE - _KDBUS_ITEM_KERNEL_BASE] = translate_id_change,
542 [KDBUS_ITEM_REPLY_TIMEOUT - _KDBUS_ITEM_KERNEL_BASE] = translate_reply,
543 [KDBUS_ITEM_REPLY_DEAD - _KDBUS_ITEM_KERNEL_BASE] = translate_reply,
548 assert(k->payload_type == KDBUS_PAYLOAD_KERNEL);
550 KDBUS_PART_FOREACH(d, k, items) {
551 if (d->type >= _KDBUS_ITEM_KERNEL_BASE && d->type < _KDBUS_ITEM_KERNEL_BASE + ELEMENTSOF(translate)) {
556 log_debug("Got unknown field from kernel %llu", d->type);
560 log_debug("Didn't find a kernel message to translate.");
564 return translate[found->type](bus, k, d);
567 int kdbus_translate_attach_flags(uint64_t mask, uint64_t *kdbus_mask) {
571 SET_FLAG(m, KDBUS_ATTACH_CREDS,
572 !!(mask & (SD_BUS_CREDS_UID|SD_BUS_CREDS_GID|SD_BUS_CREDS_PID|SD_BUS_CREDS_PID_STARTTIME|SD_BUS_CREDS_TID)));
574 SET_FLAG(m, KDBUS_ATTACH_COMM,
575 !!(mask & (SD_BUS_CREDS_COMM|SD_BUS_CREDS_TID_COMM)));
577 SET_FLAG(m, KDBUS_ATTACH_EXE,
578 !!(mask & SD_BUS_CREDS_EXE));
580 SET_FLAG(m, KDBUS_ATTACH_CMDLINE,
581 !!(mask & SD_BUS_CREDS_CMDLINE));
583 SET_FLAG(m, KDBUS_ATTACH_CGROUP,
584 !!(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)));
586 SET_FLAG(m, KDBUS_ATTACH_CAPS,
587 !!(mask & (SD_BUS_CREDS_EFFECTIVE_CAPS|SD_BUS_CREDS_PERMITTED_CAPS|SD_BUS_CREDS_INHERITABLE_CAPS|SD_BUS_CREDS_BOUNDING_CAPS)));
589 SET_FLAG(m, KDBUS_ATTACH_SECLABEL,
590 !!(mask & SD_BUS_CREDS_SELINUX_CONTEXT));
592 SET_FLAG(m, KDBUS_ATTACH_AUDIT,
593 !!(mask & (SD_BUS_CREDS_AUDIT_SESSION_ID|SD_BUS_CREDS_AUDIT_LOGIN_UID)));
600 static int bus_kernel_make_message(sd_bus *bus, struct kdbus_msg *k) {
601 sd_bus_message *m = NULL;
602 struct kdbus_item *d;
604 _cleanup_free_ int *fds = NULL;
605 struct bus_header *h = NULL;
606 size_t total, n_bytes = 0, idx = 0;
607 const char *destination = NULL, *seclabel = NULL;
612 assert(k->payload_type == KDBUS_PAYLOAD_DBUS1);
614 KDBUS_PART_FOREACH(d, k, items) {
617 l = d->size - offsetof(struct kdbus_item, data);
621 case KDBUS_ITEM_PAYLOAD_OFF:
623 h = (struct bus_header *)((uint8_t *)bus->kdbus_buffer + d->vec.offset);
625 if (!bus_header_is_complete(h, d->vec.size))
629 n_bytes += d->vec.size;
632 case KDBUS_ITEM_PAYLOAD_MEMFD:
636 n_bytes += d->memfd.size;
639 case KDBUS_ITEM_FDS: {
644 f = realloc(fds, sizeof(int) * (n_fds + j));
649 memcpy(fds + n_fds, d->fds, sizeof(int) * j);
654 case KDBUS_ITEM_SECLABEL:
663 r = bus_header_message_size(h, &total);
667 if (n_bytes != total)
670 r = bus_message_from_header(bus, h, sizeof(struct bus_header), fds, n_fds, NULL, seclabel, 0, &m);
674 KDBUS_PART_FOREACH(d, k, items) {
677 l = d->size - offsetof(struct kdbus_item, data);
681 case KDBUS_ITEM_PAYLOAD_OFF: {
684 begin_body = BUS_MESSAGE_BODY_BEGIN(m);
686 if (idx + d->vec.size > begin_body) {
687 struct bus_body_part *part;
689 /* Contains body material */
691 part = message_append_part(m);
697 /* A -1 offset is NUL padding. */
698 part->is_zero = d->vec.offset == ~0ULL;
700 if (idx >= begin_body) {
702 part->data = (uint8_t *)bus->kdbus_buffer + d->vec.offset;
703 part->size = d->vec.size;
706 part->data = (uint8_t *)bus->kdbus_buffer + d->vec.offset + (begin_body - idx);
707 part->size = d->vec.size - (begin_body - idx);
717 case KDBUS_ITEM_PAYLOAD_MEMFD: {
718 struct bus_body_part *part;
720 if (idx < BUS_MESSAGE_BODY_BEGIN(m)) {
725 part = message_append_part(m);
731 part->memfd = d->memfd.fd;
732 part->size = d->memfd.size;
735 idx += d->memfd.size;
739 case KDBUS_ITEM_CREDS:
740 m->creds.pid_starttime = d->creds.starttime / NSEC_PER_USEC;
741 m->creds.uid = d->creds.uid;
742 m->creds.gid = d->creds.gid;
743 m->creds.pid = d->creds.pid;
744 m->creds.tid = d->creds.tid;
745 m->creds.mask |= (SD_BUS_CREDS_UID|SD_BUS_CREDS_GID|SD_BUS_CREDS_PID|SD_BUS_CREDS_PID_STARTTIME|SD_BUS_CREDS_TID) & bus->creds_mask;
748 case KDBUS_ITEM_TIMESTAMP:
749 m->realtime = d->timestamp.realtime_ns / NSEC_PER_USEC;
750 m->monotonic = d->timestamp.monotonic_ns / NSEC_PER_USEC;
753 case KDBUS_ITEM_PID_COMM:
754 m->creds.comm = d->str;
755 m->creds.mask |= SD_BUS_CREDS_COMM & bus->creds_mask;
758 case KDBUS_ITEM_TID_COMM:
759 m->creds.tid_comm = d->str;
760 m->creds.mask |= SD_BUS_CREDS_TID_COMM & bus->creds_mask;
764 m->creds.exe = d->str;
765 m->creds.mask |= SD_BUS_CREDS_EXE & bus->creds_mask;
768 case KDBUS_ITEM_CMDLINE:
769 m->creds.cmdline = d->str;
770 m->creds.cmdline_length = l;
771 m->creds.mask |= SD_BUS_CREDS_CMDLINE & bus->creds_mask;
774 case KDBUS_ITEM_CGROUP:
775 m->creds.cgroup = d->str;
776 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;
779 case KDBUS_ITEM_AUDIT:
780 m->creds.audit_session_id = d->audit.sessionid;
781 m->creds.audit_login_uid = d->audit.loginuid;
782 m->creds.mask |= (SD_BUS_CREDS_AUDIT_SESSION_ID|SD_BUS_CREDS_AUDIT_LOGIN_UID) & bus->creds_mask;
785 case KDBUS_ITEM_CAPS:
786 m->creds.capability = d->data;
787 m->creds.capability_size = l;
788 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;
791 case KDBUS_ITEM_DST_NAME:
792 destination = d->str;
796 case KDBUS_ITEM_SECLABEL:
797 case KDBUS_ITEM_NAMES:
801 log_debug("Got unknown field from kernel %llu", d->type);
805 r = bus_message_parse_fields(m);
809 if (k->src_id == KDBUS_SRC_ID_KERNEL)
810 m->sender = "org.freedesktop.DBus";
812 snprintf(m->sender_buffer, sizeof(m->sender_buffer), ":1.%llu", (unsigned long long) k->src_id);
813 m->sender = m->sender_buffer;
816 if (!m->destination) {
818 m->destination = destination;
819 else if (k->dst_id != KDBUS_DST_ID_WELL_KNOWN_NAME &&
820 k->dst_id != KDBUS_DST_ID_BROADCAST) {
821 snprintf(m->destination_buffer, sizeof(m->destination_buffer), ":1.%llu", (unsigned long long) k->dst_id);
822 m->destination = m->destination_buffer;
826 /* We take possession of the kmsg struct now */
828 m->release_kdbus = true;
833 r = bus_rqueue_push(bus, m);
841 struct bus_body_part *part;
844 /* Make sure the memfds are not freed twice */
845 MESSAGE_FOREACH_PART(part, i, m)
846 if (part->memfd >= 0)
849 sd_bus_message_unref(m);
855 int bus_kernel_read_message(sd_bus *bus) {
862 /* Kernel messages might result in 2 new queued messages in
863 * the worst case (NameOwnerChange and LostName for the same
864 * well-known name, for example). Let's make room in
867 r = bus_rqueue_make_room(bus, 2);
871 r = ioctl(bus->input_fd, KDBUS_CMD_MSG_RECV, &off);
878 k = (struct kdbus_msg *)((uint8_t *)bus->kdbus_buffer + off);
880 if (k->payload_type == KDBUS_PAYLOAD_DBUS1)
881 r = bus_kernel_make_message(bus, k);
882 else if (k->payload_type == KDBUS_PAYLOAD_KERNEL)
883 r = bus_kernel_translate_message(bus, k);
888 close_kdbus_msg(bus, k);
890 return r < 0 ? r : 1;
893 int bus_kernel_create(const char *name, char **s) {
894 struct kdbus_cmd_bus_make *make;
895 struct kdbus_item *n;
903 fd = open("/dev/kdbus/control", O_RDWR|O_NOCTTY|O_CLOEXEC);
908 make = alloca0(offsetof(struct kdbus_cmd_bus_make, items) +
909 KDBUS_PART_HEADER_SIZE + sizeof(uint64_t) +
910 KDBUS_PART_HEADER_SIZE + DECIMAL_STR_MAX(uid_t) + 1 + l + 1);
913 n->type = KDBUS_MAKE_NAME;
914 sprintf(n->str, "%lu-%s", (unsigned long) getuid(), name);
915 n->size = KDBUS_PART_HEADER_SIZE + strlen(n->str) + 1;
917 make->size = offsetof(struct kdbus_cmd_bus_make, items) + n->size;
918 make->flags = KDBUS_MAKE_POLICY_OPEN;
920 make->bloom_size = BLOOM_SIZE;
921 assert_cc(BLOOM_SIZE % 8 == 0);
923 p = strjoin("/dev/kdbus/", n->str, "/bus", NULL);
927 if (ioctl(fd, KDBUS_CMD_BUS_MAKE, make) < 0) {
928 close_nointr_nofail(fd);
939 int bus_kernel_pop_memfd(sd_bus *bus, void **address, size_t *size) {
940 struct memfd_cache *c;
946 if (!bus || !bus->is_kernel)
949 assert_se(pthread_mutex_lock(&bus->memfd_cache_mutex) >= 0);
951 if (bus->n_memfd_cache <= 0) {
954 assert_se(pthread_mutex_unlock(&bus->memfd_cache_mutex) >= 0);
956 r = ioctl(bus->input_fd, KDBUS_CMD_MEMFD_NEW, &fd);
965 c = &bus->memfd_cache[--bus->n_memfd_cache];
968 assert(c->size == 0 || c->address);
970 *address = c->address;
974 assert_se(pthread_mutex_unlock(&bus->memfd_cache_mutex) >= 0);
979 static void close_and_munmap(int fd, void *address, size_t size) {
981 assert_se(munmap(address, PAGE_ALIGN(size)) >= 0);
983 close_nointr_nofail(fd);
986 void bus_kernel_push_memfd(sd_bus *bus, int fd, void *address, size_t size) {
987 struct memfd_cache *c;
988 uint64_t max_sz = PAGE_ALIGN(MEMFD_CACHE_ITEM_SIZE_MAX);
991 assert(size == 0 || address);
993 if (!bus || !bus->is_kernel) {
994 close_and_munmap(fd, address, size);
998 assert_se(pthread_mutex_lock(&bus->memfd_cache_mutex) >= 0);
1000 if (bus->n_memfd_cache >= ELEMENTSOF(bus->memfd_cache)) {
1001 assert_se(pthread_mutex_unlock(&bus->memfd_cache_mutex) >= 0);
1003 close_and_munmap(fd, address, size);
1007 c = &bus->memfd_cache[bus->n_memfd_cache++];
1009 c->address = address;
1011 /* If overly long, let's return a bit to the OS */
1012 if (size > max_sz) {
1013 assert_se(ioctl(fd, KDBUS_CMD_MEMFD_SIZE_SET, &max_sz) >= 0);
1014 assert_se(munmap((uint8_t*) address + max_sz, PAGE_ALIGN(size - max_sz)) >= 0);
1019 assert_se(pthread_mutex_unlock(&bus->memfd_cache_mutex) >= 0);
1022 void bus_kernel_flush_memfd(sd_bus *b) {
1027 for (i = 0; i < b->n_memfd_cache; i++)
1028 close_and_munmap(b->memfd_cache[i].fd, b->memfd_cache[i].address, b->memfd_cache[i].size);
1031 int kdbus_translate_request_name_flags(uint64_t sd_bus_flags, uint64_t *kdbus_flags) {
1033 assert_return(kdbus_flags != NULL, -EINVAL);
1037 if (sd_bus_flags & SD_BUS_NAME_ALLOW_REPLACEMENT)
1038 *kdbus_flags |= KDBUS_NAME_ALLOW_REPLACEMENT;
1040 if (sd_bus_flags & SD_BUS_NAME_REPLACE_EXISTING)
1041 *kdbus_flags |= KDBUS_NAME_REPLACE_EXISTING;
1043 if (!(sd_bus_flags & SD_BUS_NAME_DO_NOT_QUEUE))
1044 *kdbus_flags |= KDBUS_NAME_QUEUE;