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-rw-r--r--src/libsystemd/sd-rtnl/rtnl-internal.h4
-rw-r--r--src/libsystemd/sd-rtnl/rtnl-message.c141
-rw-r--r--src/libsystemd/sd-rtnl/sd-rtnl.c104
3 files changed, 131 insertions, 118 deletions
diff --git a/src/libsystemd/sd-rtnl/rtnl-internal.h b/src/libsystemd/sd-rtnl/rtnl-internal.h
index 9003dad312..9d857ed991 100644
--- a/src/libsystemd/sd-rtnl/rtnl-internal.h
+++ b/src/libsystemd/sd-rtnl/rtnl-internal.h
@@ -107,7 +107,9 @@ struct sd_rtnl_message {
int message_new(sd_rtnl *rtnl, sd_rtnl_message **ret, uint16_t type);
int socket_write_message(sd_rtnl *nl, sd_rtnl_message *m);
-int socket_read_message(sd_rtnl *nl, sd_rtnl_message **ret);
+int socket_read_message(sd_rtnl *nl);
+
+int rtnl_rqueue_make_room(sd_rtnl *rtnl);
int rtnl_message_read_internal(sd_rtnl_message *m, unsigned short type, void **data);
int rtnl_message_parse(sd_rtnl_message *m,
diff --git a/src/libsystemd/sd-rtnl/rtnl-message.c b/src/libsystemd/sd-rtnl/rtnl-message.c
index e5854de4c6..edf5672354 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) {
diff --git a/src/libsystemd/sd-rtnl/sd-rtnl.c b/src/libsystemd/sd-rtnl/sd-rtnl.c
index 8e709bb66d..816018a6c4 100644
--- a/src/libsystemd/sd-rtnl/sd-rtnl.c
+++ b/src/libsystemd/sd-rtnl/sd-rtnl.c
@@ -203,29 +203,35 @@ int sd_rtnl_send(sd_rtnl *nl,
return 1;
}
+int rtnl_rqueue_make_room(sd_rtnl *rtnl) {
+ assert(rtnl);
+
+ if (rtnl->rqueue_size >= RTNL_RQUEUE_MAX)
+ return -ENOBUFS;
+
+ if (!GREEDY_REALLOC(rtnl->rqueue, rtnl->rqueue_allocated, rtnl->rqueue_size + 1))
+ return -ENOMEM;
+
+ return 0;
+}
+
static int dispatch_rqueue(sd_rtnl *rtnl, sd_rtnl_message **message) {
- sd_rtnl_message *z = NULL;
int r;
assert(rtnl);
assert(message);
- if (rtnl->rqueue_size > 0) {
- /* Dispatch a queued message */
-
- *message = rtnl->rqueue[0];
- rtnl->rqueue_size --;
- memmove(rtnl->rqueue, rtnl->rqueue + 1, sizeof(sd_rtnl_message*) * rtnl->rqueue_size);
-
- return 1;
+ if (rtnl->rqueue_size <= 0) {
+ /* Try to read a new message */
+ r = socket_read_message(rtnl);
+ if (r <= 0)
+ return r;
}
- /* Try to read a new message */
- r = socket_read_message(rtnl, &z);
- if (r <= 0)
- return r;
-
- *message = z;
+ /* Dispatch a queued message */
+ *message = rtnl->rqueue[0];
+ rtnl->rqueue_size --;
+ memmove(rtnl->rqueue, rtnl->rqueue + 1, sizeof(sd_rtnl_message*) * rtnl->rqueue_size);
return 1;
}
@@ -554,20 +560,20 @@ int sd_rtnl_call_async_cancel(sd_rtnl *nl, uint32_t serial) {
return 1;
}
-int sd_rtnl_call(sd_rtnl *nl,
+int sd_rtnl_call(sd_rtnl *rtnl,
sd_rtnl_message *message,
uint64_t usec,
sd_rtnl_message **ret) {
usec_t timeout;
uint32_t serial;
- bool room = false;
+ unsigned i = 0;
int r;
- assert_return(nl, -EINVAL);
- assert_return(!rtnl_pid_changed(nl), -ECHILD);
+ assert_return(rtnl, -EINVAL);
+ assert_return(!rtnl_pid_changed(rtnl), -ECHILD);
assert_return(message, -EINVAL);
- r = sd_rtnl_send(nl, message, &serial);
+ r = sd_rtnl_send(rtnl, message, &serial);
if (r < 0)
return r;
@@ -575,53 +581,43 @@ int sd_rtnl_call(sd_rtnl *nl,
for (;;) {
usec_t left;
- _cleanup_rtnl_message_unref_ sd_rtnl_message *incoming = NULL;
-
- if (!room) {
- sd_rtnl_message **q;
-
- if (nl->rqueue_size >= RTNL_RQUEUE_MAX)
- return -ENOBUFS;
- /* Make sure there's room for queueing this
- * locally, before we read the message */
+ while (i < rtnl->rqueue_size) {
+ sd_rtnl_message *incoming;
+ uint32_t received_serial;
- q = realloc(nl->rqueue, (nl->rqueue_size + 1) * sizeof(sd_rtnl_message*));
- if (!q)
- return -ENOMEM;
-
- nl->rqueue = q;
- room = true;
- }
-
- r = socket_read_message(nl, &incoming);
- if (r < 0)
- return r;
- if (incoming) {
- uint32_t received_serial = rtnl_message_get_serial(incoming);
+ incoming = rtnl->rqueue[i];
+ received_serial = rtnl_message_get_serial(incoming);
if (received_serial == serial) {
+ /* found a match, remove from rqueue and return it */
+ memmove(rtnl->rqueue + i,rtnl->rqueue + i + 1,
+ sizeof(sd_rtnl_message*) * (rtnl->rqueue_size - i - 1));
+ rtnl->rqueue_size--;
+
r = sd_rtnl_message_get_errno(incoming);
- if (r < 0)
+ if (r < 0) {
+ sd_rtnl_message_unref(incoming);
return r;
+ }
if (ret) {
*ret = incoming;
- incoming = NULL;
- }
+ } else
+ sd_rtnl_message_unref(incoming);
return 1;
}
- /* Room was allocated on the queue above */
- nl->rqueue[nl->rqueue_size ++] = incoming;
- incoming = NULL;
- room = false;
-
/* Try to read more, right away */
- continue;
+ i ++;
}
- if (r != 0)
+
+ r = socket_read_message(rtnl);
+ if (r < 0)
+ return r;
+ if (r > 0)
+ /* receieved message, so try to process straight away */
continue;
if (timeout > 0) {
@@ -635,11 +631,11 @@ int sd_rtnl_call(sd_rtnl *nl,
} else
left = (uint64_t) -1;
- r = rtnl_poll(nl, true, left);
+ r = rtnl_poll(rtnl, true, left);
if (r < 0)
return r;
- r = dispatch_wqueue(nl);
+ r = dispatch_wqueue(rtnl);
if (r < 0)
return r;
}
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-11-09 01:26:00 +0000