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-rw-r--r--src/libsystemd-bus/bus-control.c8
-rw-r--r--src/libsystemd-bus/bus-internal.h2
-rw-r--r--src/libsystemd-bus/bus-kernel.c43
-rw-r--r--src/libsystemd-bus/kdbus.h119
4 files changed, 113 insertions, 59 deletions
diff --git a/src/libsystemd-bus/bus-control.c b/src/libsystemd-bus/bus-control.c
index 7c139cfd32..185f77c968 100644
--- a/src/libsystemd-bus/bus-control.c
+++ b/src/libsystemd-bus/bus-control.c
@@ -64,7 +64,7 @@ int sd_bus_request_name(sd_bus *bus, const char *name, int flags) {
l = strlen(name);
n = alloca(offsetof(struct kdbus_cmd_name, name) + l + 1);
n->size = offsetof(struct kdbus_cmd_name, name) + l + 1;
- n->flags = flags;
+ n->name_flags = flags;
n->id = 0;
memcpy(n->name, name, l+1);
@@ -72,7 +72,7 @@ int sd_bus_request_name(sd_bus *bus, const char *name, int flags) {
if (r < 0)
return -errno;
- return n->flags;
+ return n->name_flags;
} else {
r = sd_bus_call_method(
bus,
@@ -115,7 +115,7 @@ int sd_bus_release_name(sd_bus *bus, const char *name) {
l = strlen(name);
n = alloca(offsetof(struct kdbus_cmd_name, name) + l + 1);
n->size = offsetof(struct kdbus_cmd_name, name) + l + 1;
- n->flags = 0;
+ n->name_flags = 0;
n->id = 0;
memcpy(n->name, name, l+1);
@@ -123,7 +123,7 @@ int sd_bus_release_name(sd_bus *bus, const char *name) {
if (r < 0)
return -errno;
- return n->flags;
+ return n->name_flags;
} else {
r = sd_bus_call_method(
bus,
diff --git a/src/libsystemd-bus/bus-internal.h b/src/libsystemd-bus/bus-internal.h
index 7cca9998bb..9a118f8a21 100644
--- a/src/libsystemd-bus/bus-internal.h
+++ b/src/libsystemd-bus/bus-internal.h
@@ -150,6 +150,8 @@ struct sd_bus {
uint64_t hello_serial;
unsigned iteration_counter;
+
+ uint64_t bloom_size;
};
static inline void bus_unrefp(sd_bus **b) {
diff --git a/src/libsystemd-bus/bus-kernel.c b/src/libsystemd-bus/bus-kernel.c
index 7918aeab19..f948b4e316 100644
--- a/src/libsystemd-bus/bus-kernel.c
+++ b/src/libsystemd-bus/bus-kernel.c
@@ -93,13 +93,14 @@ static void append_bloom(struct kdbus_msg_data **d, const void *p, size_t length
*d = (struct kdbus_msg_data*) ((uint8_t*) *d + (*d)->size);
}
-static int bus_message_setup_kmsg(sd_bus_message *m) {
+static int bus_message_setup_kmsg(sd_bus *b, sd_bus_message *m) {
struct kdbus_msg_data *d;
bool well_known;
uint64_t unique;
size_t sz, dl;
int r;
+ assert(b);
assert(m);
assert(m->sealed);
@@ -120,7 +121,7 @@ static int bus_message_setup_kmsg(sd_bus_message *m) {
/* Add in fixed header, fields header, fields header padding and payload */
sz += 4 * ALIGN8(offsetof(struct kdbus_msg_data, vec) + sizeof(struct kdbus_vec));
- sz += ALIGN8(offsetof(struct kdbus_msg_data, data) + 5);
+ sz += ALIGN8(offsetof(struct kdbus_msg_data, data) + b->bloom_size);
/* Add in well-known destination header */
if (well_known) {
@@ -165,8 +166,14 @@ static int bus_message_setup_kmsg(sd_bus_message *m) {
if (m->body)
append_payload_vec(&d, m->body, m->header->body_size);
- if (m->kdbus->dst_id == KDBUS_DST_ID_BROADCAST)
- append_bloom(&d, "bloom", 5);
+ if (m->kdbus->dst_id == KDBUS_DST_ID_BROADCAST) {
+ void *p;
+
+ /* For now, let's add a mask all bloom filter */
+ p = alloca(b->bloom_size);
+ memset(p, 0xFF, b->bloom_size);
+ append_bloom(&d, p, b->bloom_size);
+ }
m->kdbus->size = (uint8_t*) d - (uint8_t*) m->kdbus;
assert(m->kdbus->size <= sz);
@@ -189,9 +196,16 @@ int bus_kernel_take_fd(sd_bus *b) {
if (r < 0)
return -errno;
+ /* The higher 32bit of both flags fields are considered
+ * 'incompatible flags'. Refuse them all for now. */
+ if (hello.bus_flags > 0xFFFFFFFFULL ||
+ hello.conn_flags > 0xFFFFFFFFULL)
+ return -ENOTSUP;
+
if (asprintf(&b->unique_name, ":1.%llu", (unsigned long long) hello.id) < 0)
return -ENOMEM;
+ b->bloom_size = hello.bloom_size;
b->is_kernel = true;
b->bus_client = true;
@@ -227,7 +241,7 @@ int bus_kernel_write_message(sd_bus *bus, sd_bus_message *m) {
assert(m);
assert(bus->state == BUS_RUNNING);
- r = bus_message_setup_kmsg(m);
+ r = bus_message_setup_kmsg(bus, m);
if (r < 0)
return r;
@@ -437,7 +451,7 @@ int bus_kernel_read_message(sd_bus *bus, sd_bus_message **m) {
}
int bus_kernel_create(const char *name, char **s) {
- struct kdbus_cmd_fname *fname;
+ struct kdbus_cmd_bus_make *make;
size_t l;
int fd;
char *p;
@@ -450,17 +464,18 @@ int bus_kernel_create(const char *name, char **s) {
return -errno;
l = strlen(name);
- fname = alloca(offsetof(struct kdbus_cmd_fname, name) + DECIMAL_STR_MAX(uid_t) + 1 + l + 1);
- sprintf(fname->name, "%lu-%s", (unsigned long) getuid(), name);
- fname->size = offsetof(struct kdbus_cmd_fname, name) + strlen(fname->name) + 1;
- fname->kernel_flags = KDBUS_CMD_FNAME_ACCESS_WORLD | KDBUS_CMD_FNAME_POLICY_OPEN;
- fname->user_flags = 0;
-
- p = strjoin("/dev/kdbus/", fname->name, "/bus", NULL);
+ make = alloca(offsetof(struct kdbus_cmd_bus_make, name) + DECIMAL_STR_MAX(uid_t) + 1 + l + 1);
+ sprintf(make->name, "%lu-%s", (unsigned long) getuid(), name);
+ make->size = offsetof(struct kdbus_cmd_bus_make, name) + strlen(make->name) + 1;
+ make->flags = KDBUS_ACCESS_WORLD | KDBUS_POLICY_OPEN;
+ make->bus_flags = 0;
+ make->bloom_size = 16;
+
+ p = strjoin("/dev/kdbus/", make->name, "/bus", NULL);
if (!p)
return -ENOMEM;
- if (ioctl(fd, KDBUS_CMD_BUS_MAKE, fname) < 0) {
+ if (ioctl(fd, KDBUS_CMD_BUS_MAKE, make) < 0) {
close_nointr_nofail(fd);
free(p);
return -errno;
diff --git a/src/libsystemd-bus/kdbus.h b/src/libsystemd-bus/kdbus.h
index 7f65375c44..8c643feceb 100644
--- a/src/libsystemd-bus/kdbus.h
+++ b/src/libsystemd-bus/kdbus.h
@@ -48,6 +48,11 @@ struct kdbus_creds {
__u64 starttime;
};
+struct kdbus_audit {
+ __u64 sessionid;
+ __u64 loginuid;
+};
+
#define KDBUS_SRC_ID_KERNEL (0)
#define KDBUS_DST_ID_WELL_KNOWN_NAME (0)
#define KDBUS_MATCH_SRC_ID_ANY (~0ULL)
@@ -58,25 +63,23 @@ enum {
/* Filled in by userspace */
KDBUS_MSG_NULL, /* empty record */
KDBUS_MSG_PAYLOAD, /* .data */
- KDBUS_MSG_PAYLOAD_VEC, /* .data_vec, converted into _PAYLOAD at delivery */
- KDBUS_MSG_MMAP, /* .data_vec */
- KDBUS_MSG_MMAP_DONATE, /* .data_vec, unmap the memory from the sender */
+ KDBUS_MSG_PAYLOAD_VEC, /* .data_vec */
KDBUS_MSG_UNIX_FDS, /* .data_fds of file descriptors */
- KDBUS_MSG_BLOOM, /* for broadcasts, carries bloom filter blob */
- KDBUS_MSG_DST_NAME, /* destination's well-known name */
+ KDBUS_MSG_BLOOM, /* for broadcasts, carries bloom filter blob in .data */
+ KDBUS_MSG_DST_NAME, /* destination's well-known name, in .str */
/* Filled in by kernelspace */
KDBUS_MSG_SRC_NAMES = 0x200,/* NUL separated string list with well-known names of source */
KDBUS_MSG_TIMESTAMP, /* .ts_ns of CLOCK_MONOTONIC */
KDBUS_MSG_SRC_CREDS, /* .creds */
- KDBUS_MSG_SRC_COMM, /* optional */
- KDBUS_MSG_SRC_THREAD_COMM, /* optional */
- KDBUS_MSG_SRC_EXE, /* optional */
- KDBUS_MSG_SRC_CMDLINE, /* optional */
- KDBUS_MSG_SRC_CGROUP, /* optional, specified which one */
- KDBUS_MSG_SRC_CAPS, /* caps data blob */
- KDBUS_MSG_SRC_SECLABEL, /* NUL terminated string */
- KDBUS_MSG_SRC_AUDIT, /* array of two uint64_t of audit loginuid + sessiond */
+ KDBUS_MSG_SRC_PID_COMM, /* optional, in .str */
+ KDBUS_MSG_SRC_TID_COMM, /* optional, in .str */
+ KDBUS_MSG_SRC_EXE, /* optional, in .str */
+ KDBUS_MSG_SRC_CMDLINE, /* optional, in .str (a chain of NUL str) */
+ KDBUS_MSG_SRC_CGROUP, /* optional, in .str */
+ KDBUS_MSG_SRC_CAPS, /* caps data blob, in .data */
+ KDBUS_MSG_SRC_SECLABEL, /* NUL terminated string, in .str */
+ KDBUS_MSG_SRC_AUDIT, /* .audit */
/* Special messages from kernel, consisting of one and only one of these data blocks */
KDBUS_MSG_NAME_ADD = 0x400,/* .name_change */
@@ -106,7 +109,7 @@ struct kdbus_msg_data {
union {
/* inline data */
__u8 data[0];
- char str[0];
+ char str[0];
__u32 data_u32[0];
__u64 data_u64[0];
@@ -117,6 +120,7 @@ struct kdbus_msg_data {
int fds[0]; /* int array of file descriptors */
__u64 ts_ns; /* timestamp in nanoseconds */
struct kdbus_creds creds;
+ struct kdbus_audit audit;
struct kdbus_manager_msg_name_change name_change;
struct kdbus_manager_msg_id_change id_change;
};
@@ -191,24 +195,37 @@ struct kdbus_policy {
struct kdbus_cmd_policy {
__u64 size;
- __u8 buffer[0]; /* a series of KDBUS_POLICY_NAME plus one or more KDBUS_POLICY_ACCESS each. */
+ __u8 buffer[0]; /* a series of KDBUS_POLICY_NAME plus one or
+ * more KDBUS_POLICY_ACCESS each. */
};
enum {
- KDBUS_CMD_HELLO_STARTER = 1,
- KDBUS_CMD_HELLO_ACCEPT_FD = 2,
- KDBUS_CMD_HELLO_ACCEPT_MMAP = 4,
+ KDBUS_CMD_HELLO_STARTER = 1 << 0,
+ KDBUS_CMD_HELLO_ACCEPT_FD = 1 << 1,
+ KDBUS_CMD_HELLO_ACCEPT_MMAP = 1 << 2,
+
+ /* The following have an effect on directed messages only --
+ * not for broadcasts */
+ KDBUS_CMD_HELLO_ATTACH_COMM = 1 << 10,
+ KDBUS_CMD_HELLO_ATTACH_EXE = 1 << 11,
+ KDBUS_CMD_HELLO_ATTACH_CMDLINE = 1 << 12,
+ KDBUS_CMD_HELLO_ATTACH_CGROUP = 1 << 13,
+ KDBUS_CMD_HELLO_ATTACH_CAPS = 1 << 14,
+ KDBUS_CMD_HELLO_ATTACH_SECLABEL = 1 << 15,
+ KDBUS_CMD_HELLO_ATTACH_AUDIT = 1 << 16,
};
+/* Flags for kdbus_cmd_bus_make, kdbus_cmd_ep_make and
+ * kdbus_cmd_ns_make */
enum {
- KDBUS_CMD_FNAME_ACCESS_GROUP = 1,
- KDBUS_CMD_FNAME_ACCESS_WORLD = 2,
- KDBUS_CMD_FNAME_POLICY_OPEN = 4,
+ KDBUS_ACCESS_GROUP = 1,
+ KDBUS_ACCESS_WORLD = 2,
+ KDBUS_POLICY_OPEN = 4,
};
struct kdbus_cmd_hello {
/* userspace → kernel, kernel → userspace */
- __u64 kernel_flags; /* userspace specifies its
+ __u64 conn_flags; /* userspace specifies its
* capabilities and more, kernel
* returns its capabilites and
* more. Kernel might refuse client's
@@ -233,19 +250,47 @@ struct kdbus_cmd_hello {
* to do negotiation of features of
* the payload that is transfreted. */
__u64 id; /* peer id */
+ __u64 bloom_size; /* The bloom filter size chosen by the
+ * bus owner */
};
-struct kdbus_cmd_fname {
+struct kdbus_cmd_bus_make {
__u64 size;
- __u64 kernel_flags; /* userspace → kernel, kernel → userspace
- * When creating a bus/ns/ep feature
- * kernel negotiation done the same
- * way as for KDBUS_CMD_BUS_MAKE. */
- __u64 user_flags; /* userspace → kernel
+ __u64 flags; /* userspace → kernel, kernel → userspace
+ * When creating a bus feature
+ * kernel negotiation. */
+ __u64 bus_flags; /* userspace → kernel
* When a bus is created this value is
* copied verbatim into the bus
* structure and returned from
* KDBUS_CMD_HELLO, later */
+ __u64 cgroup_id; /* the cgroup hierarchy ID for which
+ * to attach cgroup membership paths
+ * to messages. 0 if no cgroup data
+ * shall be attached. */
+ __u64 bloom_size; /* Size of the bloom filter for this bus. */
+ char name[0];
+};
+
+struct kdbus_cmd_ep_make {
+ __u64 size;
+ __u64 flags; /* userspace → kernel, kernel → userspace
+ * When creating an entry point
+ * feature kernel negotiation done the
+ * same way as for
+ * KDBUS_CMD_BUS_MAKE. Unused for
+ * now. */
+ char name[0];
+};
+
+struct kdbus_cmd_ns_make {
+ __u64 size;
+ __u64 flags; /* userspace → kernel, kernel → userspace
+ * When creating an entry point
+ * feature kernel negotiation done the
+ * same way as for
+ * KDBUS_CMD_BUS_MAKE. Unused for
+ * now. */
char name[0];
};
@@ -254,7 +299,6 @@ enum {
KDBUS_CMD_NAME_REPLACE_EXISTING = 1,
KDBUS_CMD_NAME_QUEUE = 2,
KDBUS_CMD_NAME_ALLOW_REPLACEMENT = 4,
- KDBUS_CMD_NAME_STEAL_MESSAGES = 8,
/* kernel → userspace */
KDBUS_CMD_NAME_IN_QUEUE = 0x200,
@@ -262,8 +306,9 @@ enum {
struct kdbus_cmd_name {
__u64 size;
- __u64 flags;
+ __u64 name_flags;
__u64 id; /* We allow registration/deregestration of names of other peers */
+ __u64 conn_flags;
char name[0];
};
@@ -334,14 +379,14 @@ struct kdbus_cmd_monitor {
*/
enum kdbus_cmd {
/* kdbus control node commands: require unset state */
- KDBUS_CMD_BUS_MAKE = _IOWR(KDBUS_IOC_MAGIC, 0x00, struct kdbus_cmd_fname),
- KDBUS_CMD_NS_MAKE = _IOWR(KDBUS_IOC_MAGIC, 0x10, struct kdbus_cmd_fname),
+ KDBUS_CMD_BUS_MAKE = _IOWR(KDBUS_IOC_MAGIC, 0x00, struct kdbus_cmd_bus_make),
+ KDBUS_CMD_NS_MAKE = _IOWR(KDBUS_IOC_MAGIC, 0x10, struct kdbus_cmd_ns_make),
/* kdbus control node commands: require bus owner state */
KDBUS_CMD_BUS_POLICY_SET = _IOWR(KDBUS_IOC_MAGIC, 0x20, struct kdbus_cmd_policy),
/* kdbus ep node commands: require unset state */
- KDBUS_CMD_EP_MAKE = _IOWR(KDBUS_IOC_MAGIC, 0x30, struct kdbus_cmd_fname),
+ KDBUS_CMD_EP_MAKE = _IOWR(KDBUS_IOC_MAGIC, 0x30, struct kdbus_cmd_ep_make),
KDBUS_CMD_HELLO = _IOWR(KDBUS_IOC_MAGIC, 0x31, struct kdbus_cmd_hello),
/* kdbus ep node commands: require connected state */
@@ -361,11 +406,3 @@ enum kdbus_cmd {
KDBUS_CMD_EP_POLICY_SET = _IOWR(KDBUS_IOC_MAGIC, 0x70, struct kdbus_cmd_policy),
};
#endif
-
-/* Think about:
- *
- * - allow HELLO to change unique names
- * - allow HELLO without assigning a unique name at all
- * - when receive fails due to too small buffer return real size
- * - when receiving maybe allow read-only mmaping into reciving process memory space or so?
- */
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-11-24 11:19:45 +0000