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path: root/src/libsystemd/sd-rtnl/rtnl-message.c
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Diffstat (limited to 'src/libsystemd/sd-rtnl/rtnl-message.c')
-rw-r--r--src/libsystemd/sd-rtnl/rtnl-message.c141
1 files changed, 78 insertions, 63 deletions
diff --git a/src/libsystemd/sd-rtnl/rtnl-message.c b/src/libsystemd/sd-rtnl/rtnl-message.c
index e5854de4c..edf567235 100644
--- a/src/libsystemd/sd-rtnl/rtnl-message.c
+++ b/src/libsystemd/sd-rtnl/rtnl-message.c
@@ -42,11 +42,10 @@
#define GET_CONTAINER(m, i) ((i) < (m)->n_containers ? (struct rtattr*)((uint8_t*)(m)->hdr + (m)->container_offsets[i]) : NULL)
#define PUSH_CONTAINER(m, new) (m)->container_offsets[(m)->n_containers ++] = (uint8_t*)(new) - (uint8_t*)(m)->hdr;
-static int message_new_empty(sd_rtnl *rtnl, sd_rtnl_message **ret, size_t initial_size) {
+static int message_new_empty(sd_rtnl *rtnl, sd_rtnl_message **ret) {
sd_rtnl_message *m;
assert_return(ret, -EINVAL);
- assert_return(initial_size >= sizeof(struct nlmsghdr), -EINVAL);
/* Note that 'rtnl' is curretly unused, if we start using it internally
we must take care to avoid problems due to mutual references between
@@ -57,15 +56,8 @@ static int message_new_empty(sd_rtnl *rtnl, sd_rtnl_message **ret, size_t initia
if (!m)
return -ENOMEM;
- m->hdr = malloc0(initial_size);
- if (!m->hdr) {
- free(m);
- return -ENOMEM;
- }
-
m->n_ref = REFCNT_INIT;
- m->hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
m->sealed = false;
*ret = m;
@@ -74,6 +66,7 @@ static int message_new_empty(sd_rtnl *rtnl, sd_rtnl_message **ret, size_t initia
}
int message_new(sd_rtnl *rtnl, sd_rtnl_message **ret, uint16_t type) {
+ _cleanup_rtnl_message_unref_ sd_rtnl_message *m = NULL;
const NLType *nl_type;
size_t size;
int r;
@@ -84,15 +77,25 @@ int message_new(sd_rtnl *rtnl, sd_rtnl_message **ret, uint16_t type) {
assert(nl_type->type == NLA_NESTED);
- size = NLMSG_SPACE(nl_type->size);
-
- r = message_new_empty(rtnl, ret, size);
+ r = message_new_empty(rtnl, &m);
if (r < 0)
return r;
- (*ret)->container_type_system[0] = nl_type->type_system;
- (*ret)->hdr->nlmsg_len = size;
- (*ret)->hdr->nlmsg_type = type;
+ size = NLMSG_SPACE(nl_type->size);
+
+ assert(size >= sizeof(struct nlmsghdr));
+ m->hdr = malloc0(size);
+ if (!m->hdr)
+ return -ENOMEM;
+
+ m->hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
+
+ m->container_type_system[0] = nl_type->type_system;
+ m->hdr->nlmsg_len = size;
+ m->hdr->nlmsg_type = type;
+
+ *ret = m;
+ m = NULL;
return 0;
}
@@ -1014,33 +1017,28 @@ int socket_write_message(sd_rtnl *nl, sd_rtnl_message *m) {
* If nothing useful was received 0 is returned.
* On failure, a negative error code is returned.
*/
-int socket_read_message(sd_rtnl *nl, sd_rtnl_message **ret) {
- _cleanup_rtnl_message_unref_ sd_rtnl_message *m = NULL;
- const NLType *nl_type;
- struct nlmsghdr *new_hdr;
+int socket_read_message(sd_rtnl *rtnl) {
+ _cleanup_free_ void *buffer = NULL;
+ struct nlmsghdr *new_msg;
union {
struct sockaddr sa;
struct sockaddr_nl nl;
} addr;
- socklen_t addr_len;
+ socklen_t addr_len = sizeof(addr);
size_t need, len;
- int r;
+ int r, ret = 0;
- assert(nl);
- assert(ret);
-
- r = message_receive_need(nl, &need);
- if (r < 0)
- return r;
+ assert(rtnl);
- r = message_new_empty(nl, &m, need);
+ r = message_receive_need(rtnl, &need);
if (r < 0)
return r;
- addr_len = sizeof(addr);
+ buffer = malloc0(need);
+ if (!buffer)
+ return -ENOMEM;
- r = recvfrom(nl->fd, m->hdr, need,
- 0, &addr.sa, &addr_len);
+ r = recvfrom(rtnl->fd, buffer, need, 0, &addr.sa, &addr_len);
if (r < 0)
return (errno == EAGAIN) ? 0 : -errno; /* no data */
else if (r == 0)
@@ -1050,47 +1048,64 @@ int socket_read_message(sd_rtnl *nl, sd_rtnl_message **ret) {
return -EIO; /* not a netlink message */
else if (addr.nl.nl_pid != 0)
return 0; /* not from the kernel */
- else if ((size_t) r < sizeof(struct nlmsghdr) ||
- (size_t) r < m->hdr->nlmsg_len)
- return -EIO; /* too small (we do accept too big though) */
- else if (m->hdr->nlmsg_pid && m->hdr->nlmsg_pid != nl->sockaddr.nl.nl_pid)
- return 0; /* not broadcast and not for us */
else
- len = (size_t) r;
+ len = (size_t)r;
- /* silently drop noop messages */
- if (m->hdr->nlmsg_type == NLMSG_NOOP)
- return 0;
+ for (new_msg = buffer; NLMSG_OK(new_msg, len); new_msg = NLMSG_NEXT(new_msg, len)) {
+ _cleanup_rtnl_message_unref_ sd_rtnl_message *m = NULL;
+ const NLType *nl_type;
- /* check that we support this message type */
- r = type_system_get_type(NULL, &nl_type, m->hdr->nlmsg_type);
- if (r < 0) {
- if (r == -ENOTSUP)
- log_debug("sd-rtnl: ignored message with unknown type: %u",
- m->hdr->nlmsg_type);
+ if (new_msg->nlmsg_pid && new_msg->nlmsg_pid != rtnl->sockaddr.nl.nl_pid)
+ /* not broadcast and not for us */
+ continue;
- return 0;
- }
+ /* silently drop noop messages */
+ if (new_msg->nlmsg_type == NLMSG_NOOP)
+ continue;
- /* check that the size matches the message type */
- if (len < NLMSG_LENGTH(nl_type->size))
- return -EIO;
+ /* check that we support this message type */
+ r = type_system_get_type(NULL, &nl_type, new_msg->nlmsg_type);
+ if (r < 0) {
+ if (r == -ENOTSUP)
+ log_debug("sd-rtnl: ignored message with unknown type: %u",
+ new_msg->nlmsg_type);
- /* we probably allocated way too much memory, give it back */
- new_hdr = realloc(m->hdr, len);
- if (!new_hdr)
- return -ENOMEM;
- m->hdr = new_hdr;
+ continue;
+ }
- /* seal and parse the top-level message */
- r = sd_rtnl_message_rewind(m);
- if (r < 0)
- return r;
+ /* check that the size matches the message type */
+ if (new_msg->nlmsg_len < NLMSG_LENGTH(nl_type->size))
+ continue;
- *ret = m;
- m = NULL;
+ r = message_new_empty(rtnl, &m);
+ if (r < 0)
+ return r;
+
+ m->hdr = memdup(new_msg, new_msg->nlmsg_len);
+ if (!m->hdr)
+ return -ENOMEM;
+
+ /* seal and parse the top-level message */
+ r = sd_rtnl_message_rewind(m);
+ if (r < 0)
+ return r;
+
+ r = rtnl_rqueue_make_room(rtnl);
+ if (r < 0)
+ return r;
+
+ rtnl->rqueue[rtnl->rqueue_size ++] = m;
+ m = NULL;
+ ret += new_msg->nlmsg_len;
+
+ /* reached end of multi-part message, or not a multi-part
+ message at all */
+ if (new_msg->nlmsg_type == NLMSG_DONE ||
+ !(new_msg->nlmsg_flags & NLM_F_MULTI))
+ break;
+ }
- return len;
+ return ret;
}
int sd_rtnl_message_rewind(sd_rtnl_message *m) {
generated by cgit v1.2.3 (git 2.25.1) at 2024-07-06 03:16:44 +0000