static struct sk_buff *dnrmg_build_message(struct sk_buff *rt_skb, int *errp)
{
struct sk_buff *skb = NULL;
size_t size;
sk_buff_data_t old_tail;
struct nlmsghdr *nlh;
unsigned char *ptr;
struct nf_dn_rtmsg *rtm;
size = NLMSG_ALIGN(rt_skb->len) +
NLMSG_ALIGN(sizeof(struct nf_dn_rtmsg));
skb = nlmsg_new(size, GFP_ATOMIC);
if (!skb) {
*errp = -ENOMEM;
return NULL;
}
old_tail = skb->tail;
nlh = nlmsg_put(skb, 0, 0, 0, size, 0);
if (!nlh) {
kfree_skb(skb);
*errp = -ENOMEM;
return NULL;
}
rtm = (struct nf_dn_rtmsg *)nlmsg_data(nlh);
rtm->nfdn_ifindex = rt_skb->dev->ifindex;
ptr = NFDN_RTMSG(rtm);
skb_copy_from_linear_data(rt_skb, ptr, rt_skb->len);
nlh->nlmsg_len = skb->tail - old_tail;
return skb;
}
static struct sk_buff *dnrmg_build_message(struct sk_buff *rt_skb, int *errp)
{
struct sk_buff *skb = NULL;
size_t size;
sk_buff_data_t old_tail;
struct nlmsghdr *nlh;
unsigned char *ptr;
struct nf_dn_rtmsg *rtm;
size = NLMSG_SPACE(rt_skb->len);
size += NLMSG_ALIGN(sizeof(struct nf_dn_rtmsg));
skb = alloc_skb(size, GFP_ATOMIC);
if (!skb)
goto nlmsg_failure;
old_tail = skb->tail;
nlh = NLMSG_PUT(skb, 0, 0, 0, size - sizeof(*nlh));
rtm = (struct nf_dn_rtmsg *)NLMSG_DATA(nlh);
rtm->nfdn_ifindex = rt_skb->dev->ifindex;
ptr = NFDN_RTMSG(rtm);
skb_copy_from_linear_data(rt_skb, ptr, rt_skb->len);
nlh->nlmsg_len = skb->tail - old_tail;
return skb;
nlmsg_failure:
if (skb)
kfree_skb(skb);
*errp = -ENOMEM;
if (net_ratelimit())
printk(KERN_ERR "dn_rtmsg: error creating netlink message\n");
return NULL;
}