#ifndef _PACKET_H_
#define _PACKET_H_

#include <arpa/inet.h>
#include <netinet/ip.h>
#include <netinet/ip6.h>

#define IPPROTO_HIDE_EID 0xfd


struct packet {
    union {
#ifdef __USE_BSD
        struct ip ip;
#else
        struct iphdr ip;
#endif
        struct ip6_hdr ip6;
    } hdr;
    char payload[IP_MAXPACKET]; /* payload is this - header size, but OK */
};

// wrapper.c expects this name
#define recv_pkt packet


// It's all our code that uses this. 12 is much more than we need to
// construct a wrapped packet at the moment.
//
// initial usage:
//   0 - wrapping ip header, including enc_size
//   1 - encrypted portion of payload, in scratch.
//   2 - unencrypted portion of payload, in recv_pkt
#define MAX_IOVS 12
struct rsp_data {
    int count;
    struct iovec iovs[MAX_IOVS];
    unsigned char scratch[IP_MAXPACKET]; // somewhere easy to put results
};

void compute_ip_checksum( struct iphdr* pkt );

int wrap_ipv4_packet(struct rlocs* reg, struct recv_pkt* pkt, struct rsp_data* out);
int wrap_ipv6_packet(struct rlocs* reg, struct recv_pkt* pkt, struct rsp_data* out);

int unwrap_ipv4_packet(struct rlocs* reg, struct recv_pkt* pkt, struct rsp_data* out);
int unwrap_ipv6_packet(struct rlocs* reg, struct recv_pkt* pkt, struct rsp_data* out);
#endif