static void compressed_sl_print(netdissect_options *ndo, const u_char *chdr, const struct ip *ip, u_int length, int dir) { register const u_char *cp = chdr; register u_int flags, hlen; flags = *cp++; if (flags & NEW_C) { lastconn = *cp++; ND_PRINT((ndo, "ctcp %d", lastconn)); } else ND_PRINT((ndo, "ctcp *")); /* skip tcp checksum */ cp += 2; switch (flags & SPECIALS_MASK) { case SPECIAL_I: ND_PRINT((ndo, " *SA+%d", lastlen[dir][lastconn])); break; case SPECIAL_D: ND_PRINT((ndo, " *S+%d", lastlen[dir][lastconn])); break; default: if (flags & NEW_U) cp = print_sl_change(ndo, "U=", cp); if (flags & NEW_W) cp = print_sl_winchange(ndo, cp); if (flags & NEW_A) cp = print_sl_change(ndo, "A+", cp); if (flags & NEW_S) cp = print_sl_change(ndo, "S+", cp); break; } if (flags & NEW_I) cp = print_sl_change(ndo, "I+", cp); /* * 'hlen' is the length of the uncompressed TCP/IP header (in words). * 'cp - chdr' is the length of the compressed header. * 'length - hlen' is the amount of data in the packet. */ hlen = IP_HL(ip); hlen += TH_OFF((struct tcphdr *)&((int32_t *)ip)[hlen]); lastlen[dir][lastconn] = length - (hlen << 2); ND_PRINT((ndo, " %d (%ld)", lastlen[dir][lastconn], (long)(cp - chdr))); }
static void compressed_sl_print(const u_char *chdr, const struct ip *ip, u_int length, int dir) { register const u_char *cp = chdr; register u_int flags, hlen; flags = *cp++; if (flags & NEW_C) { lastconn = *cp++; printf("ctcp %d", lastconn); } else printf("ctcp *"); /* skip tcp checksum */ cp += 2; switch (flags & SPECIALS_MASK) { case SPECIAL_I: printf(" *SA+%d", lastlen[dir][lastconn]); break; case SPECIAL_D: printf(" *S+%d", lastlen[dir][lastconn]); break; default: if (flags & NEW_U) cp = print_sl_change("U=", cp); if (flags & NEW_W) cp = print_sl_winchange(cp); if (flags & NEW_A) cp = print_sl_change("A+", cp); if (flags & NEW_S) cp = print_sl_change("S+", cp); break; } if (flags & NEW_I) cp = print_sl_change("I+", cp); /* * 'hlen' is the length of the uncompressed TCP/IP header (in words). * 'cp - chdr' is the length of the compressed header. * 'length - hlen' is the amount of data in the packet. */ hlen = ip->ip_hl; hlen += ((struct tcphdr *)&((int32_t *)ip)[hlen])->th_off; lastlen[dir][lastconn] = length - (hlen << 2); printf(" %d (%d)", lastlen[dir][lastconn], cp - chdr); }