diff options
Diffstat (limited to 'print-ip.c')
| -rw-r--r-- | print-ip.c | 68 |
1 files changed, 29 insertions, 39 deletions
@@ -21,9 +21,7 @@ /* \summary: IP printer */ -#ifdef HAVE_CONFIG_H #include <config.h> -#endif #include "netdissect-stdinc.h" @@ -318,7 +316,7 @@ static const struct tok ip_frag_values[] = { void ip_print(netdissect_options *ndo, const u_char *bp, - u_int length) + const u_int length) { const struct ip *ip; u_int off; @@ -329,51 +327,36 @@ ip_print(netdissect_options *ndo, uint16_t sum, ip_sum; const char *p_name; int truncated = 0; + int presumed_tso = 0; ndo->ndo_protocol = "ip"; ip = (const struct ip *)bp; - if (IP_V(ip) != 4) { /* print version and fail if != 4 */ - if (IP_V(ip) == 6) - ND_PRINT("IP6, wrong link-layer encapsulation"); - else - ND_PRINT("IP%u", IP_V(ip)); - nd_print_invalid(ndo); - return; - } - if (!ndo->ndo_eflag) - ND_PRINT("IP "); - ND_TCHECK_SIZE(ip); - if (length < sizeof (struct ip)) { - ND_PRINT("truncated-ip %u", length); - return; + if (!ndo->ndo_eflag) { + nd_print_protocol_caps(ndo); + ND_PRINT(" "); } + + ND_ICHECK_ZU(length, <, sizeof (struct ip)); + ND_ICHECKMSG_U("version", IP_V(ip), !=, 4); + hlen = IP_HL(ip) * 4; - if (hlen < sizeof (struct ip)) { - ND_PRINT("bad-hlen %u", hlen); - return; - } + ND_ICHECKMSG_ZU("header length", hlen, <, sizeof (struct ip)); len = GET_BE_U_2(ip->ip_len); - if (length < len) - ND_PRINT("truncated-ip - %u bytes missing! ", - len - length); - if (len < hlen) { -#ifdef GUESS_TSO - if (len) { - ND_PRINT("bad-len %u", len); - return; - } - else { - /* we guess that it is a TSO send */ - len = length; - } -#else - ND_PRINT("bad-len %u", len); - return; -#endif /* GUESS_TSO */ + if (len > length) { + ND_PRINT("[total length %u > length %u]", len, length); + nd_print_invalid(ndo); + ND_PRINT(" "); } + if (len == 0) { + /* we guess that it is a TSO send */ + len = length; + presumed_tso = 1; + } else + ND_ICHECKMSG_U("total length", len, <, hlen); + ND_TCHECK_SIZE(ip); /* * Cut off the snapshot length to the end of the IP payload. */ @@ -426,7 +409,10 @@ ip_print(netdissect_options *ndo, tok2str(ipproto_values, "unknown", ip_proto), ip_proto); - ND_PRINT(", length %u", GET_BE_U_2(ip->ip_len)); + if (presumed_tso) + ND_PRINT(", length %u [was 0, presumed TSO]", length); + else + ND_PRINT(", length %u", GET_BE_U_2(ip->ip_len)); if ((hlen - sizeof(struct ip)) > 0) { ND_PRINT(", options ("); @@ -513,6 +499,10 @@ ip_print(netdissect_options *ndo, trunc: nd_print_trunc(ndo); + return; + +invalid: + nd_print_invalid(ndo); } void |