[NETLINK]: Introduce nlmsg_hdr() helper
For the common "(struct nlmsghdr *)skb->data" sequence, so that we reduce the
number of direct accesses to skb->data and for consistency with all the other
cast skb member helpers.
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/connector/connector.c b/drivers/connector/connector.c
index a905f78..7f9c4fb 100644
--- a/drivers/connector/connector.c
+++ b/drivers/connector/connector.c
@@ -212,7 +212,7 @@
skb = skb_get(__skb);
if (skb->len >= NLMSG_SPACE(0)) {
- nlh = (struct nlmsghdr *)skb->data;
+ nlh = nlmsg_hdr(skb);
if (nlh->nlmsg_len < sizeof(struct cn_msg) ||
skb->len < nlh->nlmsg_len ||
diff --git a/drivers/scsi/scsi_netlink.c b/drivers/scsi/scsi_netlink.c
index 1b59b27..45646a2 100644
--- a/drivers/scsi/scsi_netlink.c
+++ b/drivers/scsi/scsi_netlink.c
@@ -50,7 +50,7 @@
while (skb->len >= NLMSG_SPACE(0)) {
err = 0;
- nlh = (struct nlmsghdr *) skb->data;
+ nlh = nlmsg_hdr(skb);
if ((nlh->nlmsg_len < (sizeof(*nlh) + sizeof(*hdr))) ||
(skb->len < nlh->nlmsg_len)) {
printk(KERN_WARNING "%s: discarding partial skb\n",
diff --git a/drivers/scsi/scsi_transport_iscsi.c b/drivers/scsi/scsi_transport_iscsi.c
index ce0d14a..10590cd 100644
--- a/drivers/scsi/scsi_transport_iscsi.c
+++ b/drivers/scsi/scsi_transport_iscsi.c
@@ -1081,7 +1081,7 @@
struct nlmsghdr *nlh;
struct iscsi_uevent *ev;
- nlh = (struct nlmsghdr *)skb->data;
+ nlh = nlmsg_hdr(skb);
if (nlh->nlmsg_len < sizeof(*nlh) ||
skb->len < nlh->nlmsg_len) {
break;
diff --git a/fs/ecryptfs/netlink.c b/fs/ecryptfs/netlink.c
index e3aa225..8405d21 100644
--- a/fs/ecryptfs/netlink.c
+++ b/fs/ecryptfs/netlink.c
@@ -97,7 +97,7 @@
*/
static int ecryptfs_process_nl_response(struct sk_buff *skb)
{
- struct nlmsghdr *nlh = (struct nlmsghdr*)skb->data;
+ struct nlmsghdr *nlh = nlmsg_hdr(skb);
struct ecryptfs_message *msg = NLMSG_DATA(nlh);
int rc;
@@ -181,7 +181,7 @@
"rc = [%d]\n", rc);
return;
}
- nlh = (struct nlmsghdr *)skb->data;
+ nlh = nlmsg_hdr(skb);
if (!NLMSG_OK(nlh, skb->len)) {
ecryptfs_printk(KERN_ERR, "Received corrupt netlink "
"message\n");
diff --git a/include/linux/netlink.h b/include/linux/netlink.h
index 68a632b..36629ff 100644
--- a/include/linux/netlink.h
+++ b/include/linux/netlink.h
@@ -138,6 +138,11 @@
#include <linux/capability.h>
#include <linux/skbuff.h>
+static inline struct nlmsghdr *nlmsg_hdr(const struct sk_buff *skb)
+{
+ return (struct nlmsghdr *)skb->data;
+}
+
struct netlink_skb_parms
{
struct ucred creds; /* Skb credentials */
diff --git a/kernel/audit.c b/kernel/audit.c
index ea85214..80a7457 100644
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -151,7 +151,7 @@
static void audit_set_pid(struct audit_buffer *ab, pid_t pid)
{
- struct nlmsghdr *nlh = (struct nlmsghdr *)ab->skb->data;
+ struct nlmsghdr *nlh = nlmsg_hdr(ab->skb);
nlh->nlmsg_pid = pid;
}
@@ -750,7 +750,7 @@
u32 rlen;
while (skb->len >= NLMSG_SPACE(0)) {
- nlh = (struct nlmsghdr *)skb->data;
+ nlh = nlmsg_hdr(skb);
if (nlh->nlmsg_len < sizeof(*nlh) || skb->len < nlh->nlmsg_len)
return;
rlen = NLMSG_ALIGN(nlh->nlmsg_len);
@@ -1268,7 +1268,7 @@
audit_log_lost("rate limit exceeded");
} else {
if (audit_pid) {
- struct nlmsghdr *nlh = (struct nlmsghdr *)ab->skb->data;
+ struct nlmsghdr *nlh = nlmsg_hdr(ab->skb);
nlh->nlmsg_len = ab->skb->len - NLMSG_SPACE(0);
skb_queue_tail(&audit_skb_queue, ab->skb);
ab->skb = NULL;
diff --git a/kernel/taskstats.c b/kernel/taskstats.c
index 4c3476f..ad7d239 100644
--- a/kernel/taskstats.c
+++ b/kernel/taskstats.c
@@ -102,7 +102,7 @@
*/
static int send_reply(struct sk_buff *skb, pid_t pid)
{
- struct genlmsghdr *genlhdr = nlmsg_data((struct nlmsghdr *)skb->data);
+ struct genlmsghdr *genlhdr = nlmsg_data(nlmsg_hdr(skb));
void *reply = genlmsg_data(genlhdr);
int rc;
@@ -121,7 +121,7 @@
static void send_cpu_listeners(struct sk_buff *skb,
struct listener_list *listeners)
{
- struct genlmsghdr *genlhdr = nlmsg_data((struct nlmsghdr *)skb->data);
+ struct genlmsghdr *genlhdr = nlmsg_data(nlmsg_hdr(skb));
struct listener *s, *tmp;
struct sk_buff *skb_next, *skb_cur = skb;
void *reply = genlmsg_data(genlhdr);
diff --git a/net/decnet/netfilter/dn_rtmsg.c b/net/decnet/netfilter/dn_rtmsg.c
index ceefd9d..9e8256a 100644
--- a/net/decnet/netfilter/dn_rtmsg.c
+++ b/net/decnet/netfilter/dn_rtmsg.c
@@ -102,7 +102,7 @@
static inline void dnrmg_receive_user_skb(struct sk_buff *skb)
{
- struct nlmsghdr *nlh = (struct nlmsghdr *)skb->data;
+ struct nlmsghdr *nlh = nlmsg_hdr(skb);
if (nlh->nlmsg_len < sizeof(*nlh) || skb->len < nlh->nlmsg_len)
return;
diff --git a/net/ipv4/fib_frontend.c b/net/ipv4/fib_frontend.c
index cac06c4..3ff753c 100644
--- a/net/ipv4/fib_frontend.c
+++ b/net/ipv4/fib_frontend.c
@@ -807,7 +807,7 @@
if (skb == NULL)
return;
- nlh = (struct nlmsghdr *)skb->data;
+ nlh = nlmsg_hdr(skb);
if (skb->len < NLMSG_SPACE(0) || skb->len < nlh->nlmsg_len ||
nlh->nlmsg_len < NLMSG_LENGTH(sizeof(*frn))) {
kfree_skb(skb);
diff --git a/net/ipv4/inet_diag.c b/net/ipv4/inet_diag.c
index 37362cd1d0..238999e 100644
--- a/net/ipv4/inet_diag.c
+++ b/net/ipv4/inet_diag.c
@@ -847,7 +847,7 @@
{
if (skb->len >= NLMSG_SPACE(0)) {
int err;
- struct nlmsghdr *nlh = (struct nlmsghdr *)skb->data;
+ struct nlmsghdr *nlh = nlmsg_hdr(skb);
if (nlh->nlmsg_len < sizeof(*nlh) ||
skb->len < nlh->nlmsg_len)
diff --git a/net/ipv4/netfilter/ip_queue.c b/net/ipv4/netfilter/ip_queue.c
index 15e0d20..17f7c98 100644
--- a/net/ipv4/netfilter/ip_queue.c
+++ b/net/ipv4/netfilter/ip_queue.c
@@ -497,7 +497,7 @@
if (skblen < sizeof(*nlh))
return;
- nlh = (struct nlmsghdr *)skb->data;
+ nlh = nlmsg_hdr(skb);
nlmsglen = nlh->nlmsg_len;
if (nlmsglen < sizeof(*nlh) || skblen < nlmsglen)
return;
diff --git a/net/ipv6/netfilter/ip6_queue.c b/net/ipv6/netfilter/ip6_queue.c
index 5cfce21..275e625 100644
--- a/net/ipv6/netfilter/ip6_queue.c
+++ b/net/ipv6/netfilter/ip6_queue.c
@@ -487,7 +487,7 @@
if (skblen < sizeof(*nlh))
return;
- nlh = (struct nlmsghdr *)skb->data;
+ nlh = nlmsg_hdr(skb);
nlmsglen = nlh->nlmsg_len;
if (nlmsglen < sizeof(*nlh) || skblen < nlmsglen)
return;
diff --git a/net/netlink/af_netlink.c b/net/netlink/af_netlink.c
index 50dc5ed..04b72d3 100644
--- a/net/netlink/af_netlink.c
+++ b/net/netlink/af_netlink.c
@@ -1471,7 +1471,7 @@
int err;
while (skb->len >= nlmsg_total_size(0)) {
- nlh = (struct nlmsghdr *) skb->data;
+ nlh = nlmsg_hdr(skb);
if (nlh->nlmsg_len < NLMSG_HDRLEN || skb->len < nlh->nlmsg_len)
return 0;
diff --git a/net/tipc/netlink.c b/net/tipc/netlink.c
index b8e1edc..4cdafa2 100644
--- a/net/tipc/netlink.c
+++ b/net/tipc/netlink.c
@@ -57,7 +57,7 @@
if (rep_buf) {
skb_push(rep_buf, hdr_space);
- rep_nlh = (struct nlmsghdr *)rep_buf->data;
+ rep_nlh = nlmsg_hdr(rep_buf);
memcpy(rep_nlh, req_nlh, hdr_space);
rep_nlh->nlmsg_len = rep_buf->len;
genlmsg_unicast(rep_buf, req_nlh->nlmsg_pid);
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index addb585..5f02b4b 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -3786,7 +3786,7 @@
err = -EINVAL;
goto out;
}
- nlh = (struct nlmsghdr *)skb->data;
+ nlh = nlmsg_hdr(skb);
err = selinux_nlmsg_lookup(isec->sclass, nlh->nlmsg_type, &perm);
if (err) {