X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?a=blobdiff_plain;f=src%2Flibsystemd%2Fsd-bus%2Fbus-kernel.c;h=cdca48d92baa9cde3b403c042bcce8b7b6a89164;hb=19ee32dc4d337a033c95c7d3302666f2ea4340bd;hp=752c63adb3a1a636726d71ada3bcf9ad2256401a;hpb=cb01aedc3b4ba70859267159fe716253e3551ec6;p=elogind.git

diff --git a/src/libsystemd/sd-bus/bus-kernel.c b/src/libsystemd/sd-bus/bus-kernel.c
index 752c63adb..cdca48d92 100644
--- a/src/libsystemd/sd-bus/bus-kernel.c
+++ b/src/libsystemd/sd-bus/bus-kernel.c
@@ -294,8 +294,8 @@ static int bus_message_setup_kmsg(sd_bus *b, sd_bus_message *m) {
         memzero(m->kdbus, sz);
 
         m->kdbus->flags =
-                ((m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED) ? 0 : KDBUS_MSG_FLAGS_EXPECT_REPLY) |
-                ((m->header->flags & BUS_MESSAGE_NO_AUTO_START) ? KDBUS_MSG_FLAGS_NO_AUTO_START : 0);
+                ((m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED) ? 0 : KDBUS_MSG_EXPECT_REPLY) |
+                ((m->header->flags & BUS_MESSAGE_NO_AUTO_START) ? KDBUS_MSG_NO_AUTO_START : 0);
 
         if (well_known)
                 /* verify_destination_id will usually be 0, which makes the kernel driver only look
@@ -761,7 +761,7 @@ static int bus_kernel_make_message(sd_bus *bus, struct kdbus_msg *k) {
         }
 
         /* Refuse messages where the reply flag doesn't match up */
-        if (!(m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED) != !!(k->flags & KDBUS_MSG_FLAGS_EXPECT_REPLY)) {
+        if (!(m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED) != !!(k->flags & KDBUS_MSG_EXPECT_REPLY)) {
                 r = -EBADMSG;
                 goto fail;
         }
@@ -773,7 +773,7 @@ static int bus_kernel_make_message(sd_bus *bus, struct kdbus_msg *k) {
         }
 
         /* Refuse messages where the autostart flag doesn't match up */
-        if (!(m->header->flags & BUS_MESSAGE_NO_AUTO_START) != !(k->flags & KDBUS_MSG_FLAGS_NO_AUTO_START)) {
+        if (!(m->header->flags & BUS_MESSAGE_NO_AUTO_START) != !(k->flags & KDBUS_MSG_NO_AUTO_START)) {
                 r = -EBADMSG;
                 goto fail;
         }
@@ -815,7 +815,13 @@ fail:
 }
 
 int bus_kernel_take_fd(sd_bus *b) {
+        struct kdbus_cmd_free cmd_free = {
+                .size = sizeof(cmd_free),
+                .flags = 0,
+        };
+        struct kdbus_bloom_parameter *bloom = NULL;
         struct kdbus_cmd_hello *hello;
+        struct kdbus_item_list *items;
         struct kdbus_item *item;
         _cleanup_free_ char *g = NULL;
         const char *name;
@@ -928,23 +934,40 @@ int bus_kernel_take_fd(sd_bus *b) {
                 b->kdbus_buffer = mmap(NULL, KDBUS_POOL_SIZE, PROT_READ, MAP_SHARED, b->input_fd, 0);
                 if (b->kdbus_buffer == MAP_FAILED) {
                         b->kdbus_buffer = NULL;
-                        return -errno;
+                        r = -errno;
+                        goto fail;
                 }
         }
 
         /* The higher 32bit of the bus_flags fields are considered
          * 'incompatible flags'. Refuse them all for now. */
-        if (hello->bus_flags > 0xFFFFFFFFULL)
-                return -ENOTSUP;
+        if (hello->bus_flags > 0xFFFFFFFFULL) {
+                r = -ENOTSUP;
+                goto fail;
+        }
 
-        if (!bloom_validate_parameters((size_t) hello->bloom.size, (unsigned) hello->bloom.n_hash))
-                return -ENOTSUP;
+        /* extract bloom parameters from items */
+        items = (void*)((uint8_t*)b->kdbus_buffer + hello->offset);
+        KDBUS_ITEM_FOREACH(item, items, items) {
+                switch (item->type) {
+                case KDBUS_ITEM_BLOOM_PARAMETER:
+                        bloom = &item->bloom_parameter;
+                        break;
+                }
+        }
 
-        b->bloom_size = (size_t) hello->bloom.size;
-        b->bloom_n_hash = (unsigned) hello->bloom.n_hash;
+        if (!bloom || !bloom_validate_parameters((size_t) bloom->size, (unsigned) bloom->n_hash)) {
+                r = -ENOTSUP;
+                goto fail;
+        }
 
-        if (asprintf(&b->unique_name, ":1.%llu", (unsigned long long) hello->id) < 0)
-                return -ENOMEM;
+        b->bloom_size = (size_t) bloom->size;
+        b->bloom_n_hash = (unsigned) bloom->n_hash;
+
+        if (asprintf(&b->unique_name, ":1.%llu", (unsigned long long) hello->id) < 0) {
+                r = -ENOMEM;
+                goto fail;
+        }
 
         b->unique_id = hello->id;
 
@@ -957,7 +980,15 @@ int bus_kernel_take_fd(sd_bus *b) {
         /* the kernel told us the UUID of the underlying bus */
         memcpy(b->server_id.bytes, hello->id128, sizeof(b->server_id.bytes));
 
+        /* free returned items */
+        (void) bus_kernel_cmd_free(b, hello->offset);
+
         return bus_start_running(b);
+
+fail:
+        cmd_free.offset = hello->offset;
+        (void) ioctl(b->input_fd, KDBUS_CMD_FREE, &cmd_free);
+        return r;
 }
 
 int bus_kernel_connect(sd_bus *b) {
@@ -980,6 +1011,7 @@ int bus_kernel_connect(sd_bus *b) {
 
 int bus_kernel_cmd_free(sd_bus *bus, uint64_t offset) {
         struct kdbus_cmd_free cmd = {
+                .size = sizeof(cmd),
                 .flags = 0,
                 .offset = offset,
         };
@@ -1012,6 +1044,7 @@ static void close_kdbus_msg(sd_bus *bus, struct kdbus_msg *k) {
 }
 
 int bus_kernel_write_message(sd_bus *bus, sd_bus_message *m, bool hint_sync_call) {
+        struct kdbus_cmd_send cmd = { };
         int r;
 
         assert(bus);
@@ -1027,15 +1060,20 @@ int bus_kernel_write_message(sd_bus *bus, sd_bus_message *m, bool hint_sync_call
         if (r < 0)
                 return r;
 
+        cmd.size = sizeof(cmd);
+        cmd.msg_address = (uintptr_t)m->kdbus;
+
         /* If this is a synchronous method call, then let's tell the
          * kernel, so that it can pass CPU time/scheduling to the
          * destination for the time, if it wants to. If we
          * synchronously wait for the result anyway, we won't need CPU
          * anyway. */
-        if (hint_sync_call)
-                m->kdbus->flags |= KDBUS_MSG_FLAGS_EXPECT_REPLY|KDBUS_MSG_FLAGS_SYNC_REPLY;
+        if (hint_sync_call) {
+                m->kdbus->flags |= KDBUS_MSG_EXPECT_REPLY;
+                cmd.flags |= KDBUS_SEND_SYNC_REPLY;
+        }
 
-        r = ioctl(bus->output_fd, KDBUS_CMD_MSG_SEND, m->kdbus);
+        r = ioctl(bus->output_fd, KDBUS_CMD_SEND, &cmd);
         if (r < 0) {
                 _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
                 sd_bus_message *reply;
@@ -1085,7 +1123,7 @@ int bus_kernel_write_message(sd_bus *bus, sd_bus_message *m, bool hint_sync_call
         } else if (hint_sync_call) {
                 struct kdbus_msg *k;
 
-                k = (struct kdbus_msg *)((uint8_t *)bus->kdbus_buffer + m->kdbus->offset_reply);
+                k = (struct kdbus_msg *)((uint8_t *)bus->kdbus_buffer + cmd.reply.offset);
                 assert(k);
 
                 if (k->payload_type == KDBUS_PAYLOAD_DBUS) {
@@ -1246,7 +1284,7 @@ static int bus_kernel_translate_message(sd_bus *bus, struct kdbus_msg *k) {
 }
 
 int bus_kernel_read_message(sd_bus *bus, bool hint_priority, int64_t priority) {
-        struct kdbus_cmd_recv recv = {};
+        struct kdbus_cmd_recv recv = { .size = sizeof(recv) };
         struct kdbus_msg *k;
         int r;
 
@@ -1261,7 +1299,7 @@ int bus_kernel_read_message(sd_bus *bus, bool hint_priority, int64_t priority) {
                 recv.priority = priority;
         }
 
-        r = ioctl(bus->input_fd, KDBUS_CMD_MSG_RECV, &recv);
+        r = ioctl(bus->input_fd, KDBUS_CMD_RECV, &recv);
         if (r < 0) {
                 if (errno == EAGAIN)
                         return 0;
@@ -1274,7 +1312,7 @@ int bus_kernel_read_message(sd_bus *bus, bool hint_priority, int64_t priority) {
                 return -errno;
         }
 
-        k = (struct kdbus_msg *)((uint8_t *)bus->kdbus_buffer + recv.offset);
+        k = (struct kdbus_msg *)((uint8_t *)bus->kdbus_buffer + recv.reply.offset);
         if (k->payload_type == KDBUS_PAYLOAD_DBUS) {
                 r = bus_kernel_make_message(bus, k);
 
@@ -1472,6 +1510,7 @@ int bus_kernel_create_bus(const char *name, bool world, char **s) {
         make = alloca0_align(offsetof(struct kdbus_cmd_make, items) +
                              ALIGN8(offsetof(struct kdbus_item, bloom_parameter) + sizeof(struct kdbus_bloom_parameter)) +
                              ALIGN8(offsetof(struct kdbus_item, data64) + sizeof(uint64_t)) +
+                             ALIGN8(offsetof(struct kdbus_item, data64) + sizeof(uint64_t)) +
                              ALIGN8(offsetof(struct kdbus_item, str) + DECIMAL_STR_MAX(uid_t) + 1 + l + 1),
                              8);
 
@@ -1498,6 +1537,13 @@ int bus_kernel_create_bus(const char *name, bool world, char **s) {
         n->data64[0] = _KDBUS_ATTACH_ANY;
         make->size += ALIGN8(n->size);
 
+        /* Provide all metadata via bus-owner queries */
+        n = KDBUS_ITEM_NEXT(n);
+        n->type = KDBUS_ITEM_ATTACH_FLAGS_SEND;
+        n->size = offsetof(struct kdbus_item, data64) + sizeof(uint64_t);
+        n->data64[0] = _KDBUS_ATTACH_ANY;
+        make->size += ALIGN8(n->size);
+
         /* Set the a good name */
         n = KDBUS_ITEM_NEXT(n);
         sprintf(n->str, UID_FMT "-%s", getuid(), name);
@@ -1718,6 +1764,7 @@ int bus_kernel_make_starter(
                 BusNamePolicy *policy,
                 BusPolicyAccess world_policy) {
 
+        struct kdbus_cmd_free cmd_free = { .size = sizeof(cmd_free) };
         struct kdbus_cmd_hello *hello;
         struct kdbus_item *n;
         size_t policy_cnt = 0;
@@ -1775,14 +1822,15 @@ int bus_kernel_make_starter(
         if (ioctl(fd, KDBUS_CMD_HELLO, hello) < 0)
                 return -errno;
 
+        /* not interested in any output values */
+        cmd_free.offset = hello->offset;
+        (void) ioctl(fd, KDBUS_CMD_FREE, &cmd_free);
+
         /* The higher 32bit of the bus_flags fields are considered
          * 'incompatible flags'. Refuse them all for now. */
         if (hello->bus_flags > 0xFFFFFFFFULL)
                 return -ENOTSUP;
 
-        if (!bloom_validate_parameters((size_t) hello->bloom.size, (unsigned) hello->bloom.n_hash))
-                return -ENOTSUP;
-
         return fd;
 }
 
@@ -1798,12 +1846,13 @@ int bus_kernel_try_close(sd_bus *bus) {
 
 int bus_kernel_drop_one(int fd) {
         struct kdbus_cmd_recv recv = {
-                .flags = KDBUS_RECV_DROP
+                .size = sizeof(recv),
+                .flags = KDBUS_RECV_DROP,
         };
 
         assert(fd >= 0);
 
-        if (ioctl(fd, KDBUS_CMD_MSG_RECV, &recv) < 0)
+        if (ioctl(fd, KDBUS_CMD_RECV, &recv) < 0)
                 return -errno;
 
         return 0;