kern/include/net.h

   1 /* Copyright (c) 2010 The Regents of the University of California
   2  * Barret Rhoden <brho@cs.berkeley.edu>
   3  * See LICENSE for details.
   4  *
   5  * Arch independent networking infrastructure */
   6
   7 #ifndef ROS_KERN_NET_H
   8 #define ROS_KERN_NET_H
   9
  10 #include <bits/netinet.h>
  11 #include <stdio.h>
  12
  13 /* A few other useful standard defines.  Note the IP header can change size. */
  14 #define ETH_HDR_SZ 14
  15 #define UDP_HDR_SZ 8
  16 #define IP_ETH_TYPE 0x0800
  17
  18 /* ROS defaults: */
  19 #define DEFAULT_TTL 64
  20
  21 /* Don't forget the bytes are in network order */
  22 struct ethernet_hdr {
  23         uint8_t                                         dst_mac[6];
  24         uint8_t                                         src_mac[6];
  25         uint16_t                                        eth_type;
  26         /* might be an optional 802.1q tag here */
  27 };
  28
  29 /* For the bit-enumerated fields, note that you need to read "backwards" through
  30  * the byte (first bits in memory are the "LSB" of the byte).  Can't seem to be
  31  * able to do it with flags/fragments (3/13 bits each...). */
  32 struct ip_hdr {
  33         unsigned                                        hdr_len : 4;
  34         unsigned                                        version : 4;
  35         uint8_t                                         tos;
  36         uint16_t                                        packet_len;
  37         uint16_t                                        id;
  38         uint16_t                                        flags_frags;
  39         uint8_t                                         ttl;
  40         uint8_t                                         protocol;
  41         uint16_t                                        checksum;
  42         uint32_t                                        src_addr;
  43         uint32_t                                        dst_addr;
  44         /* Options could be here (depends on the hdr length) */
  45 } __attribute__((packed));
  46
  47 struct udp_hdr {
  48         uint16_t                                        src_port;
  49         uint16_t                                        dst_port;
  50         uint16_t                                        length;
  51         uint16_t                                        checksum;
  52 };
  53
  54 uint16_t __ip_checksum(void *buf, unsigned int len, uint32_t sum);
  55 uint16_t ip_checksum(struct ip_hdr *ip_hdr);
  56 uint16_t udp_checksum(struct ip_hdr *ip_hdr, struct udp_hdr *udp_hdr);
  57
  58 // TODO: Move this to a better location
  59 void dumppacket(unsigned char *buff, size_t len);
  60 #endif /* ROS_KERN_NET_H */