src/packet.h

   1 #ifndef IPTRAF_NG_PACKET_H
   2 #define IPTRAF_NG_PACKET_H
   3
   4 /***
   5
   6 packet.h - external declarations for packet.c
   7
   8 ***/
   9
  10 #define INVALID_PACKET 0
  11 #define PACKET_OK 1
  12 #define CHECKSUM_ERROR 2
  13 #define PACKET_FILTERED 3
  14 #define MORE_FRAGMENTS 4
  15
  16 struct pkt_hdr {
  17         char           *pkt_buf;
  18         char           *pkt_payload;
  19         size_t          pkt_caplen;     /* bytes captured */
  20         size_t          pkt_len;        /* bytes on-the-wire */
  21         unsigned short  pkt_protocol;   /* Physical layer protocol: ETH_P_* */
  22
  23         struct sockaddr_ll *from;
  24
  25         struct ethhdr  *ethhdr;
  26         struct fddihdr *fddihdr;
  27
  28         struct iphdr   *iphdr;
  29         struct ip6_hdr *ip6_hdr;
  30 };
  31
  32 static inline __u8 pkt_iph_len(const struct pkt_hdr *pkt)
  33 {
  34         switch (pkt->pkt_protocol) {
  35         case ETH_P_IP:
  36                 return pkt->iphdr->ihl * 4;
  37         case ETH_P_IPV6:
  38                 return 40;
  39         default:
  40                 return 0;
  41         }
  42 }
  43
  44 static inline __u8 pkt_ip_protocol(const struct pkt_hdr *p)
  45 {
  46         switch (p->pkt_protocol) {
  47         case ETH_P_IP:
  48                 return p->iphdr->protocol;
  49         case ETH_P_IPV6:
  50                 return p->ip6_hdr->ip6_nxt; /* FIXME: extension headers ??? */
  51         };
  52         return 0;
  53 }
  54
  55 int packet_process(struct pkt_hdr *pkt, unsigned int *total_br,
  56                    in_port_t *sport, in_port_t *dport,
  57                    int match_opposite, int v6inv4asv6);
  58 int packet_init(struct pkt_hdr *pkt);
  59 void packet_destroy(struct pkt_hdr *pkt);
  60 int packet_is_first_fragment(struct pkt_hdr *pkt);
  61
  62 #endif  /* IPTRAF_NG_PACKET_H */