提交 b529ccf2 编写于 作者: A Arnaldo Carvalho de Melo 提交者: David S. Miller

[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: NArnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
上级 965ffea4
......@@ -212,7 +212,7 @@ static void cn_rx_skb(struct sk_buff *__skb)
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 ||
......
......@@ -50,7 +50,7 @@ scsi_nl_rcv_msg(struct sk_buff *skb)
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",
......
......@@ -1081,7 +1081,7 @@ iscsi_if_rx(struct sock *sk, int len)
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;
......
......@@ -97,7 +97,7 @@ int ecryptfs_send_netlink(char *data, int data_len,
*/
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 @@ static void ecryptfs_receive_nl_message(struct sock *sk, int len)
"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");
......
......@@ -138,6 +138,11 @@ struct nlattr
#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 */
......
......@@ -151,7 +151,7 @@ struct audit_buffer {
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 @@ static void audit_receive_skb(struct sk_buff *skb)
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 @@ void audit_log_end(struct audit_buffer *ab)
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;
......
......@@ -102,7 +102,7 @@ static int prepare_reply(struct genl_info *info, u8 cmd, struct sk_buff **skbp,
*/
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 int send_reply(struct sk_buff *skb, pid_t pid)
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);
......
......@@ -102,7 +102,7 @@ static unsigned int dnrmg_hook(unsigned int hook,
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;
......
......@@ -807,7 +807,7 @@ static void nl_fib_input(struct sock *sk, int len)
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);
......
......@@ -847,7 +847,7 @@ static inline void inet_diag_rcv_skb(struct sk_buff *skb)
{
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)
......
......@@ -497,7 +497,7 @@ ipq_rcv_skb(struct sk_buff *skb)
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;
......
......@@ -487,7 +487,7 @@ ipq_rcv_skb(struct sk_buff *skb)
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;
......
......@@ -1471,7 +1471,7 @@ static int netlink_rcv_skb(struct sk_buff *skb, int (*cb)(struct sk_buff *,
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;
......
......@@ -57,7 +57,7 @@ static int handle_cmd(struct sk_buff *skb, struct genl_info *info)
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);
......
......@@ -3786,7 +3786,7 @@ static int selinux_nlmsg_perm(struct sock *sk, struct sk_buff *skb)
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) {
......
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