text: /*
   * QEMU System Emulator
   *
   * Copyright (c) 2003-2008 Fabrice Bellard
   *
   * Permission is hereby granted, free of charge, to any person obtaining a copy
   * of this software and associated documentation files (the "Software"), to deal
   * in the Software without restriction, including without limitation the rights
   * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
   * copies of the Software, and to permit persons to whom the Software is
   * furnished to do so, subject to the following conditions:
   *
   * The above copyright notice and this permission notice shall be included in
   * all copies or substantial portions of the Software.
   *
   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
   * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
   * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
   * THE SOFTWARE.
   */
  
  #ifndef QEMU_NET_UTIL_H
  #define QEMU_NET_UTIL_H
  
  
  /*
   * Structure of an internet header, naked of options.
   */
  struct ip {
  #ifdef HOST_WORDS_BIGENDIAN
      uint8_t ip_v:4,         /* version */
              ip_hl:4;        /* header length */
  #else
      uint8_t ip_hl:4,        /* header length */
              ip_v:4;         /* version */
  #endif
      uint8_t ip_tos;         /* type of service */
      uint16_t ip_len;        /* total length */
      uint16_t ip_id;         /* identification */
      uint16_t ip_off;        /* fragment offset field */
  #define IP_DF 0x4000        /* don't fragment flag */
  #define IP_MF 0x2000        /* more fragments flag */
  #define IP_OFFMASK 0x1fff   /* mask for fragmenting bits */
      uint8_t ip_ttl;         /* time to live */
      uint8_t ip_p;           /* protocol */
      uint16_t ip_sum;        /* checksum */
      struct in_addr ip_src, ip_dst;  /* source and dest address */
  } QEMU_PACKED;
  
  static inline bool in6_equal_net(const struct in6_addr *a,
                                   const struct in6_addr *b,
                                   int prefix_len)
  {
      if (memcmp(a, b, prefix_len / 8) != 0) {
          return 0;
      }
  
      if (prefix_len % 8 == 0) {
          return 1;
      }
  
      return a->s6_addr[prefix_len / 8] >> (8 - (prefix_len % 8))
          == b->s6_addr[prefix_len / 8] >> (8 - (prefix_len % 8));
  }
  
  #define TCPS_CLOSED             0       /* closed */
  #define TCPS_LISTEN             1       /* listening for connection */
  #define TCPS_SYN_SENT           2       /* active, have sent syn */
  #define TCPS_SYN_RECEIVED       3       /* have send and received syn */
  /* states < TCPS_ESTABLISHED are those where connections not established */
  #define TCPS_ESTABLISHED        4       /* established */
  #define TCPS_CLOSE_WAIT         5       /* rcvd fin, waiting for close */
  /* states > TCPS_CLOSE_WAIT are those where user has closed */
  #define TCPS_FIN_WAIT_1         6       /* have closed, sent fin */
  #define TCPS_CLOSING            7       /* closed xchd FIN; await FIN ACK */
  #define TCPS_LAST_ACK           8       /* had fin and close; await FIN ACK */
  /* states > TCPS_CLOSE_WAIT && < TCPS_FIN_WAIT_2 await ACK of FIN */
  #define TCPS_FIN_WAIT_2         9       /* have closed, fin is acked */
  #define TCPS_TIME_WAIT          10      /* in 2*msl quiet wait after close */
  
  int net_parse_macaddr(uint8_t *macaddr, const char *p);
  
  #endif /* QEMU_NET_UTIL_H */
  