X-Git-Url: https://git.tcpdump.org/tcpdump/blobdiff_plain/32e24ead3b2a171e5f5eff50d7231c2514eda9b4..0023eaa78f123676bfa9c5fba72ea4b8a59aaa70:/print-gre.c diff --git a/print-gre.c b/print-gre.c index ddb7ddc9..7832343a 100644 --- a/print-gre.c +++ b/print-gre.c @@ -33,14 +33,10 @@ * RFC1701 (GRE), RFC1702 (GRE IPv4), and RFC2637 (Enhanced GRE) */ -#ifdef HAVE_CONFIG_H #include -#endif #include "netdissect-stdinc.h" -#include - #include "netdissect.h" #include "addrtostr.h" #include "extract.h" @@ -52,7 +48,6 @@ #define GRE_KP 0x2000 /* key present */ #define GRE_SP 0x1000 /* sequence# present */ #define GRE_sP 0x0800 /* source routing */ -#define GRE_RECRS 0x0700 /* recursion count */ #define GRE_AP 0x0080 /* acknowledgment# present */ static const struct tok gre_flag_values[] = { @@ -61,11 +56,11 @@ static const struct tok gre_flag_values[] = { { GRE_KP, "key present"}, { GRE_SP, "sequence# present"}, { GRE_sP, "source routing present"}, - { GRE_RECRS, "recursion count"}, { GRE_AP, "ack present"}, { 0, NULL } }; +#define GRE_RECRS_MASK 0x0700 /* recursion count */ #define GRE_VERS_MASK 0x0007 /* protocol version */ /* source route entry types */ @@ -87,25 +82,24 @@ gre_print(netdissect_options *ndo, const u_char *bp, u_int length) ND_TCHECK_2(bp); if (len < 2) goto trunc; - vers = EXTRACT_BE_U_2(bp) & GRE_VERS_MASK; - ND_PRINT("GREv%u",vers); - - switch(vers) { - case 0: - gre_print_0(ndo, bp, len); - break; - case 1: - gre_print_1(ndo, bp, len); - break; + vers = GET_BE_U_2(bp) & GRE_VERS_MASK; + ND_PRINT("GREv%u",vers); + + switch(vers) { + case 0: + gre_print_0(ndo, bp, len); + break; + case 1: + gre_print_1(ndo, bp, len); + break; default: - ND_PRINT(" ERROR: unknown-version"); - break; - } - return; + ND_PRINT(" ERROR: unknown-version"); + break; + } + return; trunc: nd_print_trunc(ndo); - return; } static void @@ -115,10 +109,10 @@ gre_print_0(netdissect_options *ndo, const u_char *bp, u_int length) uint16_t flags, prot; /* 16 bits ND_TCHECKed in gre_print() */ - flags = EXTRACT_BE_U_2(bp); - if (ndo->ndo_vflag) - ND_PRINT(", Flags [%s]", - bittok2str(gre_flag_values,"none",flags)); + flags = GET_BE_U_2(bp); + if (ndo->ndo_vflag) + ND_PRINT(", Flags [%s]", + bittok2str(gre_flag_values,"none",flags)); len -= 2; bp += 2; @@ -126,7 +120,7 @@ gre_print_0(netdissect_options *ndo, const u_char *bp, u_int length) ND_TCHECK_2(bp); if (len < 2) goto trunc; - prot = EXTRACT_BE_U_2(bp); + prot = GET_BE_U_2(bp); len -= 2; bp += 2; @@ -135,14 +129,14 @@ gre_print_0(netdissect_options *ndo, const u_char *bp, u_int length) if (len < 2) goto trunc; if (ndo->ndo_vflag) - ND_PRINT(", sum 0x%x", EXTRACT_BE_U_2(bp)); + ND_PRINT(", sum 0x%x", GET_BE_U_2(bp)); bp += 2; len -= 2; ND_TCHECK_2(bp); if (len < 2) goto trunc; - ND_PRINT(", off 0x%x", EXTRACT_BE_U_2(bp)); + ND_PRINT(", off 0x%x", GET_BE_U_2(bp)); bp += 2; len -= 2; } @@ -151,7 +145,7 @@ gre_print_0(netdissect_options *ndo, const u_char *bp, u_int length) ND_TCHECK_4(bp); if (len < 4) goto trunc; - ND_PRINT(", key=0x%x", EXTRACT_BE_U_4(bp)); + ND_PRINT(", key=0x%x", GET_BE_U_4(bp)); bp += 4; len -= 4; } @@ -160,7 +154,7 @@ gre_print_0(netdissect_options *ndo, const u_char *bp, u_int length) ND_TCHECK_4(bp); if (len < 4) goto trunc; - ND_PRINT(", seq %u", EXTRACT_BE_U_4(bp)); + ND_PRINT(", seq %u", GET_BE_U_4(bp)); bp += 4; len -= 4; } @@ -174,9 +168,9 @@ gre_print_0(netdissect_options *ndo, const u_char *bp, u_int length) ND_TCHECK_4(bp); if (len < 4) goto trunc; - af = EXTRACT_BE_U_2(bp); - sreoff = EXTRACT_U_1(bp + 2); - srelen = EXTRACT_U_1(bp + 3); + af = GET_BE_U_2(bp); + sreoff = GET_U_1(bp + 2); + srelen = GET_U_1(bp + 3); bp += 4; len -= 4; @@ -193,21 +187,20 @@ gre_print_0(netdissect_options *ndo, const u_char *bp, u_int length) } } - if (ndo->ndo_eflag) - ND_PRINT(", proto %s (0x%04x)", - tok2str(ethertype_values,"unknown",prot), - prot); + if (ndo->ndo_eflag) + ND_PRINT(", proto %s (0x%04x)", + tok2str(ethertype_values,"unknown",prot), prot); - ND_PRINT(", length %u",length); + ND_PRINT(", length %u",length); - if (ndo->ndo_vflag < 1) - ND_PRINT(": "); /* put in a colon as protocol demarc */ - else - ND_PRINT("\n\t"); /* if verbose go multiline */ + if (ndo->ndo_vflag < 1) + ND_PRINT(": "); /* put in a colon as protocol demarc */ + else + ND_PRINT("\n\t"); /* if verbose go multiline */ switch (prot) { case ETHERTYPE_IP: - ip_print(ndo, bp, len); + ip_print(ndo, bp, len); break; case ETHERTYPE_IPV6: ip6_print(ndo, bp, len); @@ -225,7 +218,7 @@ gre_print_0(netdissect_options *ndo, const u_char *bp, u_int length) isoclns_print(ndo, bp, len); break; case ETHERTYPE_TEB: - ether_print(ndo, bp, len, ndo->ndo_snapend - bp, NULL, NULL); + ether_print(ndo, bp, len, ND_BYTES_AVAILABLE_AFTER(bp), NULL, NULL); break; default: ND_PRINT("gre-proto-0x%x", prot); @@ -243,18 +236,18 @@ gre_print_1(netdissect_options *ndo, const u_char *bp, u_int length) uint16_t flags, prot; /* 16 bits ND_TCHECKed in gre_print() */ - flags = EXTRACT_BE_U_2(bp); + flags = GET_BE_U_2(bp); len -= 2; bp += 2; if (ndo->ndo_vflag) - ND_PRINT(", Flags [%s]", - bittok2str(gre_flag_values,"none",flags)); + ND_PRINT(", Flags [%s]", + bittok2str(gre_flag_values,"none",flags)); ND_TCHECK_2(bp); if (len < 2) goto trunc; - prot = EXTRACT_BE_U_2(bp); + prot = GET_BE_U_2(bp); len -= 2; bp += 2; @@ -265,7 +258,7 @@ gre_print_1(netdissect_options *ndo, const u_char *bp, u_int length) ND_TCHECK_4(bp); if (len < 4) goto trunc; - k = EXTRACT_BE_U_4(bp); + k = GET_BE_U_4(bp); ND_PRINT(", call %u", k & 0xffff); len -= 4; bp += 4; @@ -275,7 +268,7 @@ gre_print_1(netdissect_options *ndo, const u_char *bp, u_int length) ND_TCHECK_4(bp); if (len < 4) goto trunc; - ND_PRINT(", seq %u", EXTRACT_BE_U_4(bp)); + ND_PRINT(", seq %u", GET_BE_U_4(bp)); bp += 4; len -= 4; } @@ -284,7 +277,7 @@ gre_print_1(netdissect_options *ndo, const u_char *bp, u_int length) ND_TCHECK_4(bp); if (len < 4) goto trunc; - ND_PRINT(", ack %u", EXTRACT_BE_U_4(bp)); + ND_PRINT(", ack %u", GET_BE_U_4(bp)); bp += 4; len -= 4; } @@ -292,20 +285,19 @@ gre_print_1(netdissect_options *ndo, const u_char *bp, u_int length) if ((flags & GRE_SP) == 0) ND_PRINT(", no-payload"); - if (ndo->ndo_eflag) - ND_PRINT(", proto %s (0x%04x)", - tok2str(ethertype_values,"unknown",prot), - prot); + if (ndo->ndo_eflag) + ND_PRINT(", proto %s (0x%04x)", + tok2str(ethertype_values,"unknown",prot), prot); - ND_PRINT(", length %u",length); + ND_PRINT(", length %u",length); - if ((flags & GRE_SP) == 0) - return; + if ((flags & GRE_SP) == 0) + return; - if (ndo->ndo_vflag < 1) - ND_PRINT(": "); /* put in a colon as protocol demarc */ - else - ND_PRINT("\n\t"); /* if verbose go multiline */ + if (ndo->ndo_vflag < 1) + ND_PRINT(": "); /* put in a colon as protocol demarc */ + else + ND_PRINT("\n\t"); /* if verbose go multiline */ switch (prot) { case ETHERTYPE_PPP: @@ -323,7 +315,7 @@ trunc: static int gre_sre_print(netdissect_options *ndo, uint16_t af, uint8_t sreoff, - uint8_t srelen, const u_char *bp, u_int len) + uint8_t srelen, const u_char *bp, u_int len) { int ret; @@ -347,7 +339,7 @@ gre_sre_print(netdissect_options *ndo, uint16_t af, uint8_t sreoff, static int gre_sre_ip_print(netdissect_options *ndo, uint8_t sreoff, uint8_t srelen, - const u_char *bp, u_int len) + const u_char *bp, u_int len) { const u_char *up = bp; char buf[INET_ADDRSTRLEN]; @@ -366,25 +358,26 @@ gre_sre_ip_print(netdissect_options *ndo, uint8_t sreoff, uint8_t srelen, } while (srelen != 0) { - if (!ND_TTEST_4(bp)) - return (0); + ND_TCHECK_4(bp); if (len < 4) return (0); addrtostr(bp, buf, sizeof(buf)); ND_PRINT(" %s%s", - ((bp - up) == sreoff) ? "*" : "", buf); + ((bp - up) == sreoff) ? "*" : "", buf); bp += 4; len -= 4; srelen -= 4; } return (1); +trunc: + return 0; } static int gre_sre_asn_print(netdissect_options *ndo, uint8_t sreoff, uint8_t srelen, - const u_char *bp, u_int len) + const u_char *bp, u_int len) { const u_char *up = bp; @@ -402,18 +395,18 @@ gre_sre_asn_print(netdissect_options *ndo, uint8_t sreoff, uint8_t srelen, } while (srelen != 0) { - if (!ND_TTEST_2(bp)) - return (0); + ND_TCHECK_2(bp); if (len < 2) return (0); ND_PRINT(" %s%x", - ((bp - up) == sreoff) ? "*" : "", - EXTRACT_BE_U_2(bp)); + ((bp - up) == sreoff) ? "*" : "", GET_BE_U_2(bp)); bp += 2; len -= 2; srelen -= 2; } return (1); +trunc: + return 0; }