add pkt_buff and protocol helper functions

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

1 files changed, 20 insertions, 0 deletions

diff --git a/src/internal.h b/src/internal.h
index 3a88d1a..477dc70 100644
--- a/src/internal.h
+++ b/src/internal.h
@@ -9,4 +9,24 @@
 #	define EXPORT_SYMBOL
 #endif
 
+struct iphdr;
+struct ip6_hdr;
+
+uint16_t checksum(uint32_t sum, uint16_t *buf, int size);
+uint16_t checksum_tcpudp_ipv4(struct iphdr *iph);
+uint16_t checksum_tcpudp_ipv6(struct ip6_hdr *ip6h, void *transport_hdr);
+
+struct pkt_buff {
+	uint8_t *mac_header;
+	uint8_t *network_header;
+	uint8_t *transport_header;
+
+	uint8_t *head;
+	uint8_t *data;
+	uint8_t *tail;
+
+	uint32_t len;
+	uint32_t data_len;
+};
+
 #endif