1 files changed, 34 insertions, 0 deletions

diff --git a/net/batman-adv/main.c b/net/batman-adv/main.c
index dc33a0c484a4..f65a222b7b83 100644
--- a/net/batman-adv/main.c
+++ b/net/batman-adv/main.c
@@ -17,6 +17,8 @@
  * 02110-1301, USA
  */
 
+#include <linux/crc32c.h>
+#include <linux/highmem.h>
 #include "main.h"
 #include "sysfs.h"
 #include "debugfs.h"
@@ -420,6 +422,38 @@ int batadv_algo_seq_print_text(struct seq_file *seq, void *offset)
         return 0;
 }
 
+/**
+ * batadv_skb_crc32 - calculate CRC32 of the whole packet and skip bytes in
+ *  the header
+ * @skb: skb pointing to fragmented socket buffers
+ * @payload_ptr: Pointer to position inside the head buffer of the skb
+ *  marking the start of the data to be CRC'ed
+ *
+ * payload_ptr must always point to an address in the skb head buffer and not to
+ * a fragment.
+ */
+__be32 batadv_skb_crc32(struct sk_buff *skb, u8 *payload_ptr)
+{
+        u32 crc = 0;
+        unsigned int from;
+        unsigned int to = skb->len;
+        struct skb_seq_state st;
+        const u8 *data;
+        unsigned int len;
+        unsigned int consumed = 0;
+
+        from = (unsigned int)(payload_ptr - skb->data);
+
+        skb_prepare_seq_read(skb, from, to, &st);
+        while ((len = skb_seq_read(consumed, &data, &st)) != 0) {
+                crc = crc32c(crc, data, len);
+                consumed += len;
+        }
+        skb_abort_seq_read(&st);
+
+        return htonl(crc);
+}
+
 static int batadv_param_set_ra(const char *val, const struct kernel_param *kp)
 {
         struct batadv_algo_ops *bat_algo_ops;