X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?a=blobdiff_plain;f=src%2Flibsystemd%2Fsd-bus%2Fbus-kernel.c;h=26cd806b55e4cb015ebc1c8e08379e171e0faba1;hb=29804cc1e0f37ee34301530fd7f1eb8550be464e;hp=78a6c1062a65665a69c6ce83e18764ed6640804c;hpb=5972fe953ec56c77936a1e612ca87d8a0e6c0c64;p=elogind.git

diff --git a/src/libsystemd/sd-bus/bus-kernel.c b/src/libsystemd/sd-bus/bus-kernel.c
index 78a6c1062..26cd806b5 100644
--- a/src/libsystemd/sd-bus/bus-kernel.c
+++ b/src/libsystemd/sd-bus/bus-kernel.c
@@ -101,20 +101,21 @@ static void append_destination(struct kdbus_item **d, const char *s, size_t leng
         *d = (struct kdbus_item *) ((uint8_t*) *d + (*d)->size);
 }
 
-static void* append_bloom(struct kdbus_item **d, size_t length) {
-        void *r;
+static struct kdbus_bloom_filter *append_bloom(struct kdbus_item **d, size_t length) {
+        struct kdbus_item *i;
 
         assert(d);
 
-        *d = ALIGN8_PTR(*d);
+        i = ALIGN8_PTR(*d);
 
-        (*d)->size = offsetof(struct kdbus_item, data) + length;
-        (*d)->type = KDBUS_ITEM_BLOOM;
-        r = (*d)->data;
+        i->size = offsetof(struct kdbus_item, bloom_filter) +
+                  offsetof(struct kdbus_bloom_filter, data) +
+                  length;
+        i->type = KDBUS_ITEM_BLOOM_FILTER;
 
-        *d = (struct kdbus_item *) ((uint8_t*) *d + (*d)->size);
+        *d = (struct kdbus_item *) ((uint8_t*) i + i->size);
 
-        return r;
+        return &i->bloom_filter;
 }
 
 static void append_fds(struct kdbus_item **d, const int fds[], unsigned n_fds) {
@@ -130,25 +131,28 @@ static void append_fds(struct kdbus_item **d, const int fds[], unsigned n_fds) {
         *d = (struct kdbus_item *) ((uint8_t*) *d + (*d)->size);
 }
 
-static int bus_message_setup_bloom(sd_bus_message *m, void *bloom) {
+static int bus_message_setup_bloom(sd_bus_message *m, struct kdbus_bloom_filter *bloom) {
+        void *data;
         unsigned i;
         int r;
 
         assert(m);
         assert(bloom);
 
-        memset(bloom, 0, BLOOM_SIZE);
+        data = bloom->data;
+        memzero(data, m->bus->bloom_size);
+        bloom->generation = 0;
 
-        bloom_add_pair(bloom, "message-type", bus_message_type_to_string(m->header->type));
+        bloom_add_pair(data, m->bus->bloom_size, m->bus->bloom_n_hash, "message-type", bus_message_type_to_string(m->header->type));
 
         if (m->interface)
-                bloom_add_pair(bloom, "interface", m->interface);
+                bloom_add_pair(data, m->bus->bloom_size, m->bus->bloom_n_hash, "interface", m->interface);
         if (m->member)
-                bloom_add_pair(bloom, "member", m->member);
+                bloom_add_pair(data, m->bus->bloom_size, m->bus->bloom_n_hash, "member", m->member);
         if (m->path) {
-                bloom_add_pair(bloom, "path", m->path);
-                bloom_add_pair(bloom, "path-slash-prefix", m->path);
-                bloom_add_prefixes(bloom, "path-slash-prefix", m->path, '/');
+                bloom_add_pair(data, m->bus->bloom_size, m->bus->bloom_n_hash, "path", m->path);
+                bloom_add_pair(data, m->bus->bloom_size, m->bus->bloom_n_hash, "path-slash-prefix", m->path);
+                bloom_add_prefixes(data, m->bus->bloom_size, m->bus->bloom_n_hash, "path-slash-prefix", m->path, '/');
         }
 
         r = sd_bus_message_rewind(m, true);
@@ -183,12 +187,12 @@ static int bus_message_setup_bloom(sd_bus_message *m, void *bloom) {
                 }
 
                 *e = 0;
-                bloom_add_pair(bloom, buf, t);
+                bloom_add_pair(data, m->bus->bloom_size, m->bus->bloom_n_hash, buf, t);
 
                 strcpy(e, "-dot-prefix");
-                bloom_add_prefixes(bloom, buf, t, '.');
+                bloom_add_prefixes(data, m->bus->bloom_size, m->bus->bloom_n_hash, buf, t, '.');
                 strcpy(e, "-slash-prefix");
-                bloom_add_prefixes(bloom, buf, t, '/');
+                bloom_add_prefixes(data, m->bus->bloom_size, m->bus->bloom_n_hash, buf, t, '/');
         }
 
         return 0;
@@ -231,7 +235,9 @@ static int bus_message_setup_kmsg(sd_bus *b, sd_bus_message *m) {
                 ALIGN8(offsetof(struct kdbus_item, vec) + sizeof(struct kdbus_vec));
 
         /* Add space for bloom filter */
-        sz += ALIGN8(offsetof(struct kdbus_item, data) + BLOOM_SIZE);
+        sz += ALIGN8(offsetof(struct kdbus_item, bloom_filter) +
+                     offsetof(struct kdbus_bloom_filter, data) +
+                     m->bus->bloom_size);
 
         /* Add in well-known destination header */
         if (well_known) {
@@ -250,7 +256,7 @@ static int bus_message_setup_kmsg(sd_bus *b, sd_bus_message *m) {
         }
 
         m->free_kdbus = true;
-        memset(m->kdbus, 0, sz);
+        memzero(m->kdbus, sz);
 
         m->kdbus->flags =
                 ((m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED) ? 0 : KDBUS_MSG_FLAGS_EXPECT_REPLY) |
@@ -260,6 +266,7 @@ static int bus_message_setup_kmsg(sd_bus *b, sd_bus_message *m) {
                 m->destination ? unique : KDBUS_DST_ID_BROADCAST;
         m->kdbus->payload_type = KDBUS_PAYLOAD_DBUS;
         m->kdbus->cookie = m->header->serial;
+        m->kdbus->priority = m->priority;
 
         if (m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED)
                 m->kdbus->cookie_reply = m->reply_cookie;
@@ -302,10 +309,10 @@ static int bus_message_setup_kmsg(sd_bus *b, sd_bus_message *m) {
         }
 
         if (m->kdbus->dst_id == KDBUS_DST_ID_BROADCAST) {
-                void *p;
+                struct kdbus_bloom_filter *bloom;
 
-                p = append_bloom(&d, BLOOM_SIZE);
-                r = bus_message_setup_bloom(m, p);
+                bloom = append_bloom(&d, m->bus->bloom_size);
+                r = bus_message_setup_bloom(m, bloom);
                 if (r < 0)
                         goto fail;
         }
@@ -500,9 +507,13 @@ static int bus_kernel_make_message(sd_bus *bus, struct kdbus_msg *k) {
                         break;
 
                 case KDBUS_ITEM_TIMESTAMP:
-                        m->realtime = d->timestamp.realtime_ns / NSEC_PER_USEC;
-                        m->monotonic = d->timestamp.monotonic_ns / NSEC_PER_USEC;
-                        m->seqnum = d->timestamp.seqnum;
+
+                        if (bus->attach_flags & KDBUS_ATTACH_TIMESTAMP) {
+                                m->realtime = d->timestamp.realtime_ns / NSEC_PER_USEC;
+                                m->monotonic = d->timestamp.monotonic_ns / NSEC_PER_USEC;
+                                m->seqnum = d->timestamp.seqnum;
+                        }
+
                         break;
 
                 case KDBUS_ITEM_PID_COMM:
@@ -568,6 +579,11 @@ static int bus_kernel_make_message(sd_bus *bus, struct kdbus_msg *k) {
                                 goto fail;
                         break;
 
+                case KDBUS_ITEM_CONN_NAME:
+                        m->creds.conn_name = d->str;
+                        m->creds.mask |= SD_BUS_CREDS_CONNECTION_NAME & bus->creds_mask;
+                        break;
+
                 case KDBUS_ITEM_FDS:
                 case KDBUS_ITEM_SECLABEL:
                         break;
@@ -738,9 +754,12 @@ int bus_kernel_take_fd(sd_bus *b) {
             hello->conn_flags > 0xFFFFFFFFULL)
                 return -ENOTSUP;
 
-        if (hello->bloom_size != BLOOM_SIZE)
+        if (!bloom_validate_parameters((size_t) hello->bloom.size, (unsigned) hello->bloom.n_hash))
                 return -ENOTSUP;
 
+        b->bloom_size = (size_t) hello->bloom.size;
+        b->bloom_n_hash = (unsigned) hello->bloom.n_hash;
+
         if (asprintf(&b->unique_name, ":1.%llu", (unsigned long long) hello->id) < 0)
                 return -ENOMEM;
 
@@ -1029,7 +1048,7 @@ static int bus_kernel_translate_message(sd_bus *bus, struct kdbus_msg *k) {
         return translate[found->type - _KDBUS_ITEM_KERNEL_BASE](bus, k, found);
 }
 
-int bus_kernel_read_message(sd_bus *bus) {
+int bus_kernel_read_message(sd_bus *bus, bool hint_priority, int64_t priority) {
         struct kdbus_cmd_recv recv = {};
         struct kdbus_msg *k;
         int r;
@@ -1040,6 +1059,11 @@ int bus_kernel_read_message(sd_bus *bus) {
         if (r < 0)
                 return r;
 
+        if (hint_priority) {
+                recv.flags |= KDBUS_RECV_USE_PRIORITY;
+                recv.priority = priority;
+        }
+
         r = ioctl(bus->input_fd, KDBUS_CMD_MSG_RECV, &recv);
         if (r < 0) {
                 if (errno == EAGAIN)
@@ -1085,21 +1109,40 @@ int bus_kernel_pop_memfd(sd_bus *bus, void **address, size_t *mapped, size_t *al
         assert_se(pthread_mutex_lock(&bus->memfd_cache_mutex) >= 0);
 
         if (bus->n_memfd_cache <= 0) {
-                struct kdbus_cmd_memfd_make cmd = {
-                        .size = sizeof(struct kdbus_cmd_memfd_make),
-                };
+                _cleanup_free_ char *g = NULL;
+                struct kdbus_cmd_memfd_make *cmd;
+                struct kdbus_item *item;
+                size_t l, sz;
                 int r;
 
                 assert_se(pthread_mutex_unlock(&bus->memfd_cache_mutex) >= 0);
 
-                r = ioctl(bus->input_fd, KDBUS_CMD_MEMFD_NEW, &cmd);
+                assert(bus->connection_name);
+
+                g = sd_bus_label_escape(bus->connection_name);
+                if (!g)
+                        return -ENOMEM;
+
+                l = strlen(g);
+                sz = ALIGN8(offsetof(struct kdbus_cmd_memfd_make, items)) +
+                        ALIGN8(offsetof(struct kdbus_item, str)) +
+                        l + 1;
+                cmd = alloca0(sz);
+                cmd->size = sz;
+
+                item = cmd->items;
+                item->size = ALIGN8(offsetof(struct kdbus_item, str)) + l + 1;
+                item->type = KDBUS_ITEM_MEMFD_NAME;
+                memcpy(item->str, g, l + 1);
+
+                r = ioctl(bus->input_fd, KDBUS_CMD_MEMFD_NEW, cmd);
                 if (r < 0)
                         return -errno;
 
                 *address = NULL;
                 *mapped = 0;
                 *allocated = 0;
-                return cmd.fd;
+                return cmd->fd;
         }
 
         c = &bus->memfd_cache[--bus->n_memfd_cache];
@@ -1221,6 +1264,9 @@ int kdbus_translate_attach_flags(uint64_t mask, uint64_t *kdbus_mask) {
         if (mask & SD_BUS_CREDS_WELL_KNOWN_NAMES)
                 m |= KDBUS_ATTACH_NAMES;
 
+        if (mask & SD_BUS_CREDS_CONNECTION_NAME)
+                m |= KDBUS_ATTACH_CONN_NAME;
+
         *kdbus_mask = m;
         return 0;
 }
@@ -1245,10 +1291,16 @@ int bus_kernel_create_bus(const char *name, bool world, char **s) {
         make->size = offsetof(struct kdbus_cmd_make, items);
 
         n = make->items;
-        n->size = offsetof(struct kdbus_item, data64) + sizeof(uint64_t);
-        n->type = KDBUS_ITEM_BLOOM_SIZE;
-        n->data64[0] = BLOOM_SIZE;
-        assert_cc(BLOOM_SIZE % 8 == 0);
+        n->size = offsetof(struct kdbus_item, bloom_parameter) +
+                  sizeof(struct kdbus_bloom_parameter);
+        n->type = KDBUS_ITEM_BLOOM_PARAMETER;
+
+        n->bloom_parameter.size = DEFAULT_BLOOM_SIZE;
+        n->bloom_parameter.n_hash = DEFAULT_BLOOM_N_HASH;
+
+        assert_cc(DEFAULT_BLOOM_SIZE > 0);
+        assert_cc(DEFAULT_BLOOM_N_HASH > 0);
+
         make->size += ALIGN8(n->size);
 
         n = KDBUS_ITEM_NEXT(n);
@@ -1328,7 +1380,7 @@ int bus_kernel_create_starter(const char *bus, const char *name) {
                 return -ENOTSUP;
         }
 
-        if (hello->bloom_size != BLOOM_SIZE) {
+        if (!bloom_validate_parameters((size_t) hello->bloom.size, (unsigned) hello->bloom.n_hash)) {
                 close_nointr_nofail(fd);
                 return -ENOTSUP;
         }
@@ -1431,3 +1483,16 @@ int bus_kernel_try_close(sd_bus *bus) {
 
         return 0;
 }
+
+int bus_kernel_drop_one(int fd) {
+        struct kdbus_cmd_recv recv = {
+                .flags = KDBUS_RECV_DROP
+        };
+
+        assert(fd >= 0);
+
+        if (ioctl(fd, KDBUS_CMD_MSG_RECV, &recv) < 0)
+                return -errno;
+
+        return 0;
+}