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[NETLINK]: Introduce nlmsg_hdr() helper

Browse source 
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>
This commit is contained in:
Arnaldo Carvalho de Melo 2007-04-25 19:08:35 -07:00 committed by David S. Miller
parent 965ffea43d
commit b529ccf279
15 changed files with 23 additions and 18 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

2
drivers/connector/connector.c
View file

@ -212,7 +212,7 @@ static void cn_rx_skb(struct sk_buff *__skb)
skb = skb_get(__skb); skb = skb_get(__skb);
if (skb->len >= NLMSG_SPACE(0)) { if (skb->len >= NLMSG_SPACE(0)) {
nlh = (struct nlmsghdr *)skb->data; nlh = nlmsg_hdr(skb);
if (nlh->nlmsg_len < sizeof(struct cn_msg) || if (nlh->nlmsg_len < sizeof(struct cn_msg) ||
skb->len < nlh->nlmsg_len || skb->len < nlh->nlmsg_len ||

2
drivers/scsi/scsi_netlink.c
View file

@ -50,7 +50,7 @@ scsi_nl_rcv_msg(struct sk_buff *skb)
while (skb->len >= NLMSG_SPACE(0)) { while (skb->len >= NLMSG_SPACE(0)) {
err = 0; err = 0;
nlh = (struct nlmsghdr *) skb->data; nlh = nlmsg_hdr(skb);
if ((nlh->nlmsg_len < (sizeof(*nlh) + sizeof(*hdr))) || if ((nlh->nlmsg_len < (sizeof(*nlh) + sizeof(*hdr))) ||
(skb->len < nlh->nlmsg_len)) { (skb->len < nlh->nlmsg_len)) {
printk(KERN_WARNING "%s: discarding partial skb\n", printk(KERN_WARNING "%s: discarding partial skb\n",

2
drivers/scsi/scsi_transport_iscsi.c
View file

@ -1081,7 +1081,7 @@ iscsi_if_rx(struct sock *sk, int len)
struct nlmsghdr *nlh; struct nlmsghdr *nlh;
struct iscsi_uevent *ev; struct iscsi_uevent *ev;
nlh = (struct nlmsghdr *)skb->data; nlh = nlmsg_hdr(skb);
if (nlh->nlmsg_len < sizeof(*nlh) || if (nlh->nlmsg_len < sizeof(*nlh) ||
skb->len < nlh->nlmsg_len) { skb->len < nlh->nlmsg_len) {
break; break;

4
fs/ecryptfs/netlink.c
View file

@ -97,7 +97,7 @@ out:
*/ */
static int ecryptfs_process_nl_response(struct sk_buff *skb) 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); struct ecryptfs_message *msg = NLMSG_DATA(nlh);
int rc; int rc;
@ -181,7 +181,7 @@ receive:
"rc = [%d]\n", rc); "rc = [%d]\n", rc);
return; return;
} }
nlh = (struct nlmsghdr *)skb->data; nlh = nlmsg_hdr(skb);
if (!NLMSG_OK(nlh, skb->len)) { if (!NLMSG_OK(nlh, skb->len)) {
ecryptfs_printk(KERN_ERR, "Received corrupt netlink " ecryptfs_printk(KERN_ERR, "Received corrupt netlink "
"message\n"); "message\n");

5
include/linux/netlink.h
View file

@ -138,6 +138,11 @@ struct nlattr
#include <linux/capability.h> #include <linux/capability.h>
#include <linux/skbuff.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 netlink_skb_parms
{ {
struct ucred creds; /* Skb credentials */ struct ucred creds; /* Skb credentials */

6
kernel/audit.c
View file

@ -151,7 +151,7 @@ struct audit_buffer {
static void audit_set_pid(struct audit_buffer *ab, pid_t pid) 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; nlh->nlmsg_pid = pid;
} }
@ -750,7 +750,7 @@ static void audit_receive_skb(struct sk_buff *skb)
u32 rlen; u32 rlen;
while (skb->len >= NLMSG_SPACE(0)) { 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) if (nlh->nlmsg_len < sizeof(*nlh) || skb->len < nlh->nlmsg_len)
return; return;
rlen = NLMSG_ALIGN(nlh->nlmsg_len); rlen = NLMSG_ALIGN(nlh->nlmsg_len);
@ -1268,7 +1268,7 @@ void audit_log_end(struct audit_buffer *ab)
audit_log_lost("rate limit exceeded"); audit_log_lost("rate limit exceeded");
} else { } else {
if (audit_pid) { 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); nlh->nlmsg_len = ab->skb->len - NLMSG_SPACE(0);
skb_queue_tail(&audit_skb_queue, ab->skb); skb_queue_tail(&audit_skb_queue, ab->skb);
ab->skb = NULL; ab->skb = NULL;

4
kernel/taskstats.c
View file

@ -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) 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); void *reply = genlmsg_data(genlhdr);
int rc; 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, static void send_cpu_listeners(struct sk_buff *skb,
struct listener_list *listeners) 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 listener *s, *tmp;
struct sk_buff *skb_next, *skb_cur = skb; struct sk_buff *skb_next, *skb_cur = skb;
void *reply = genlmsg_data(genlhdr); void *reply = genlmsg_data(genlhdr);

2
net/decnet/netfilter/dn_rtmsg.c
View file

@ -102,7 +102,7 @@ static unsigned int dnrmg_hook(unsigned int hook,
static inline void dnrmg_receive_user_skb(struct sk_buff *skb) 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) if (nlh->nlmsg_len < sizeof(*nlh) || skb->len < nlh->nlmsg_len)
return; return;

2
net/ipv4/fib_frontend.c
View file

@ -807,7 +807,7 @@ static void nl_fib_input(struct sock *sk, int len)
if (skb == NULL) if (skb == NULL)
return; return;
nlh = (struct nlmsghdr *)skb->data; nlh = nlmsg_hdr(skb);
if (skb->len < NLMSG_SPACE(0) || skb->len < nlh->nlmsg_len || if (skb->len < NLMSG_SPACE(0) || skb->len < nlh->nlmsg_len ||
nlh->nlmsg_len < NLMSG_LENGTH(sizeof(*frn))) { nlh->nlmsg_len < NLMSG_LENGTH(sizeof(*frn))) {
kfree_skb(skb); kfree_skb(skb);

2
net/ipv4/inet_diag.c
View file

@ -847,7 +847,7 @@ static inline void inet_diag_rcv_skb(struct sk_buff *skb)
{ {
if (skb->len >= NLMSG_SPACE(0)) { if (skb->len >= NLMSG_SPACE(0)) {
int err; int err;
struct nlmsghdr *nlh = (struct nlmsghdr *)skb->data; struct nlmsghdr *nlh = nlmsg_hdr(skb);
if (nlh->nlmsg_len < sizeof(*nlh) || if (nlh->nlmsg_len < sizeof(*nlh) ||
skb->len < nlh->nlmsg_len) skb->len < nlh->nlmsg_len)

2
net/ipv4/netfilter/ip_queue.c
View file

@ -497,7 +497,7 @@ ipq_rcv_skb(struct sk_buff *skb)
if (skblen < sizeof(*nlh)) if (skblen < sizeof(*nlh))
return; return;
nlh = (struct nlmsghdr *)skb->data; nlh = nlmsg_hdr(skb);
nlmsglen = nlh->nlmsg_len; nlmsglen = nlh->nlmsg_len;
if (nlmsglen < sizeof(*nlh) || skblen < nlmsglen) if (nlmsglen < sizeof(*nlh) || skblen < nlmsglen)
return; return;

2
net/ipv6/netfilter/ip6_queue.c
View file

@ -487,7 +487,7 @@ ipq_rcv_skb(struct sk_buff *skb)
if (skblen < sizeof(*nlh)) if (skblen < sizeof(*nlh))
return; return;
nlh = (struct nlmsghdr *)skb->data; nlh = nlmsg_hdr(skb);
nlmsglen = nlh->nlmsg_len; nlmsglen = nlh->nlmsg_len;
if (nlmsglen < sizeof(*nlh) || skblen < nlmsglen) if (nlmsglen < sizeof(*nlh) || skblen < nlmsglen)
return; return;

2
net/netlink/af_netlink.c
View file

@ -1471,7 +1471,7 @@ static int netlink_rcv_skb(struct sk_buff *skb, int (*cb)(struct sk_buff *,
int err; int err;
while (skb->len >= nlmsg_total_size(0)) { 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) if (nlh->nlmsg_len < NLMSG_HDRLEN || skb->len < nlh->nlmsg_len)
return 0; return 0;

2
net/tipc/netlink.c
View file

@ -57,7 +57,7 @@ static int handle_cmd(struct sk_buff *skb, struct genl_info *info)
if (rep_buf) { if (rep_buf) {
skb_push(rep_buf, hdr_space); 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); memcpy(rep_nlh, req_nlh, hdr_space);
rep_nlh->nlmsg_len = rep_buf->len; rep_nlh->nlmsg_len = rep_buf->len;
genlmsg_unicast(rep_buf, req_nlh->nlmsg_pid); genlmsg_unicast(rep_buf, req_nlh->nlmsg_pid);

2
security/selinux/hooks.c
View file

@ -3786,7 +3786,7 @@ static int selinux_nlmsg_perm(struct sock *sk, struct sk_buff *skb)
err = -EINVAL; err = -EINVAL;
goto out; goto out;
} }
nlh = (struct nlmsghdr *)skb->data; nlh = nlmsg_hdr(skb);
err = selinux_nlmsg_lookup(isec->sclass, nlh->nlmsg_type, &perm); err = selinux_nlmsg_lookup(isec->sclass, nlh->nlmsg_type, &perm);
if (err) { if (err) {