+ skb_reserve(skb, sizeof(struct ethhdr));
+ icmp_packet = (struct icmp_packet_rr *)skb_put(skb, packet_len);
+
+ if (!access_ok(VERIFY_READ, buff, packet_len)) {
+ len = -EFAULT;
+ goto free_skb;
+ }
+
+ if (__copy_from_user(icmp_packet, buff, packet_len)) {
+ len = -EFAULT;
+ goto free_skb;
+ }