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authorLennart Poettering <lennart@poettering.net>2013-05-15 02:56:45 +0200
committerLennart Poettering <lennart@poettering.net>2013-05-15 02:56:45 +0200
commitc91cb83c4dbc9a95a0a2a38e7028e0a7f4af3b35 (patch)
tree5bf44548260b437f5dc62549cc5a2ce33166dd20 /src/libsystemd-bus/bus-kernel.c
parent9b29bb6853987bf6fef21531f69864fdfb39eb9a (diff)
bus: rework message struct to keep header with fields in same malloc() block
This allows us to guarantee that the first payload_vec we pass to the kernel for each message is guaranteed to include the full header and all its field.
Diffstat (limited to 'src/libsystemd-bus/bus-kernel.c')
-rw-r--r--src/libsystemd-bus/bus-kernel.c47
1 files changed, 9 insertions, 38 deletions
diff --git a/src/libsystemd-bus/bus-kernel.c b/src/libsystemd-bus/bus-kernel.c
index 3aa408414e..81469365f0 100644
--- a/src/libsystemd-bus/bus-kernel.c
+++ b/src/libsystemd-bus/bus-kernel.c
@@ -211,7 +211,7 @@ static int bus_message_setup_kmsg(sd_bus *b, sd_bus_message *m) {
sz = offsetof(struct kdbus_msg, items);
/* Add in fixed header, fields header and payload */
- sz += (1 + !!m->fields + m->n_body_parts) *
+ sz += (1 + m->n_body_parts) *
ALIGN8(offsetof(struct kdbus_item, vec) + sizeof(struct kdbus_vec));
/* Add space for bloom filter */
@@ -249,11 +249,7 @@ static int bus_message_setup_kmsg(sd_bus *b, sd_bus_message *m) {
if (well_known)
append_destination(&d, m->destination, dl);
- append_payload_vec(&d, m->header, sizeof(*m->header));
-
- if (m->fields)
- append_payload_vec(&d, m->fields, ALIGN8(m->header->fields_size));
-
+ append_payload_vec(&d, m->header, BUS_MESSAGE_BODY_BEGIN(m));
MESSAGE_FOREACH_PART(part, i, m)
append_payload_vec(&d, part->data, part->size);
@@ -398,22 +394,6 @@ static void close_kdbus_msg(sd_bus *bus, struct kdbus_msg *k) {
}
}
-static bool range_contains(
- size_t astart, size_t asize,
- size_t bstart, size_t bsize,
- void *a, void **b) {
-
- if (bstart < astart)
- return false;
-
- if (bstart + bsize > astart + asize)
- return false;
-
- *b = (uint8_t*) a + (bstart - astart);
-
- return true;
-}
-
static int bus_kernel_make_message(sd_bus *bus, struct kdbus_msg *k, sd_bus_message **ret) {
sd_bus_message *m = NULL;
struct kdbus_item *d;
@@ -439,10 +419,10 @@ static int bus_kernel_make_message(sd_bus *bus, struct kdbus_msg *k, sd_bus_mess
if (d->type == KDBUS_MSG_PAYLOAD_VEC) {
if (!h) {
- if (d->vec.size < sizeof(struct bus_header))
- return -EBADMSG;
-
h = UINT64_TO_PTR(d->vec.address);
+
+ if (!bus_header_is_complete(h, d->vec.size))
+ return -EBADMSG;
}
n_payload++;
@@ -470,7 +450,7 @@ static int bus_kernel_make_message(sd_bus *bus, struct kdbus_msg *k, sd_bus_mess
if (!h)
return -EBADMSG;
- r = bus_header_size(h, &total);
+ r = bus_header_message_size(h, &total);
if (r < 0)
return r;
@@ -489,11 +469,7 @@ static int bus_kernel_make_message(sd_bus *bus, struct kdbus_msg *k, sd_bus_mess
if (d->type == KDBUS_MSG_PAYLOAD_VEC) {
size_t begin_body;
- /* Fill in fields material */
- range_contains(idx, d->vec.size, ALIGN8(sizeof(struct bus_header)), BUS_MESSAGE_FIELDS_SIZE(m),
- UINT64_TO_PTR(d->vec.address), &m->fields);
-
- begin_body = ALIGN8(sizeof(struct bus_header)) + ALIGN8(BUS_MESSAGE_FIELDS_SIZE(m));
+ begin_body = BUS_MESSAGE_BODY_BEGIN(m);
if (idx + d->vec.size > begin_body) {
struct bus_body_part *part;
@@ -507,10 +483,10 @@ static int bus_kernel_make_message(sd_bus *bus, struct kdbus_msg *k, sd_bus_mess
}
if (idx >= begin_body) {
- part->data = (void*) d->vec.address;
+ part->data = UINT64_TO_PTR(d->vec.address);
part->size = d->vec.size;
} else {
- part->data = (uint8_t*) (uintptr_t) d->vec.address + (begin_body - idx);
+ part->data = (uint8_t*) UINT64_TO_PTR(d->vec.address) + (begin_body - idx);
part->size = d->vec.size - (begin_body - idx);
}
@@ -551,11 +527,6 @@ static int bus_kernel_make_message(sd_bus *bus, struct kdbus_msg *k, sd_bus_mess
log_debug("Got unknown field from kernel %llu", d->type);
}
- if ((BUS_MESSAGE_FIELDS_SIZE(m) > 0 && !m->fields)) {
- sd_bus_message_unref(m);
- return -EBADMSG;
- }
-
r = bus_message_parse_fields(m);
if (r < 0) {
sd_bus_message_unref(m);