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);
}