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kdbus: update to newest kdbus API

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This commit is contained in:
Lennart Poettering 2013-04-13 20:12:27 +02:00
parent d378991747
commit 5b7d4c1c16
4 changed files with 112 additions and 58 deletions
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8
src/libsystemd-bus/bus-control.c
View File

@ -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,

2
src/libsystemd-bus/bus-internal.h
View File

@ -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) {

41
src/libsystemd-bus/bus-kernel.c
View File

@ -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;
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/", fname->name, "/bus", NULL);
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;

119
src/libsystemd-bus/kdbus.h
View File

@ -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?
*/