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ipv4: store ipopts as flags, not bools

Browse Source
pull/2086/head
Victor Julien 10 years ago
parent be5a5df1f7
commit 8c37906cf9
3 changed files with 36 additions and 33 deletions
Show Stats Download Patch File Download Diff File

22
src/decode-ipv4.c
Unescape Escape View File

@ -331,7 +331,7 @@ static int DecodeIPV4Options(Packet *p, uint8_t *pkt, uint16_t len, IPV4Options
/** \todo What if more data exist after EOL (possible covert channel or data leakage)? */
SCLogDebug("IPV4OPT %" PRIu16 " len 1 @ %" PRIu16 "/%" PRIu16 "",
*pkt, (len - plen), (len - 1));
p->ip4vars.eol = TRUE;
p->ip4vars.opts_set |= IPV4_OPT_FLAG_EOL;
break;
} else if (*pkt == IPV4_OPT_NOP) {
SCLogDebug("IPV4OPT %" PRIu16 " len 1 @ %" PRIu16 "/%" PRIu16 "",
@ -339,7 +339,7 @@ static int DecodeIPV4Options(Packet *p, uint8_t *pkt, uint16_t len, IPV4Options
pkt++;
plen--;
p->ip4vars.nop = TRUE;
p->ip4vars.opts_set |= IPV4_OPT_FLAG_NOP;
/* multibyte options */
} else {
@ -379,7 +379,7 @@ static int DecodeIPV4Options(Packet *p, uint8_t *pkt, uint16_t len, IPV4Options
return -1;
}
opts->o_ts = opt;
p->ip4vars.ts = TRUE;
p->ip4vars.opts_set |= IPV4_OPT_FLAG_TS;
break;
case IPV4_OPT_RR:
if (opts->o_rr.type != 0) {
@ -390,7 +390,7 @@ static int DecodeIPV4Options(Packet *p, uint8_t *pkt, uint16_t len, IPV4Options
return -1;
}
opts->o_rr = opt;
p->ip4vars.rr = TRUE;
p->ip4vars.opts_set |= IPV4_OPT_FLAG_RR;
break;
case IPV4_OPT_QS:
if (opts->o_qs.type != 0) {
@ -401,7 +401,7 @@ static int DecodeIPV4Options(Packet *p, uint8_t *pkt, uint16_t len, IPV4Options
return -1;
}
opts->o_qs = opt;
p->ip4vars.qs = TRUE;
p->ip4vars.opts_set |= IPV4_OPT_FLAG_QS;
break;
case IPV4_OPT_SEC:
if (opts->o_sec.type != 0) {
@ -412,7 +412,7 @@ static int DecodeIPV4Options(Packet *p, uint8_t *pkt, uint16_t len, IPV4Options
return -1;
}
opts->o_sec = opt;
p->ip4vars.sec = TRUE;
p->ip4vars.opts_set |= IPV4_OPT_FLAG_SEC;
break;
case IPV4_OPT_LSRR:
if (opts->o_lsrr.type != 0) {
@ -423,7 +423,7 @@ static int DecodeIPV4Options(Packet *p, uint8_t *pkt, uint16_t len, IPV4Options
return -1;
}
opts->o_lsrr = opt;
p->ip4vars.lsrr = TRUE;
p->ip4vars.opts_set |= IPV4_OPT_FLAG_LSRR;
break;
case IPV4_OPT_CIPSO:
if (opts->o_cipso.type != 0) {
@ -434,7 +434,7 @@ static int DecodeIPV4Options(Packet *p, uint8_t *pkt, uint16_t len, IPV4Options
return -1;
}
opts->o_cipso = opt;
p->ip4vars.cipso = TRUE;
p->ip4vars.opts_set |= IPV4_OPT_FLAG_CIPSO;
break;
case IPV4_OPT_SID:
if (opts->o_sid.type != 0) {
@ -445,7 +445,7 @@ static int DecodeIPV4Options(Packet *p, uint8_t *pkt, uint16_t len, IPV4Options
return -1;
}
opts->o_sid = opt;
p->ip4vars.sid = TRUE;
p->ip4vars.opts_set |= IPV4_OPT_FLAG_SID;
break;
case IPV4_OPT_SSRR:
if (opts->o_ssrr.type != 0) {
@ -456,7 +456,7 @@ static int DecodeIPV4Options(Packet *p, uint8_t *pkt, uint16_t len, IPV4Options
return -1;
}
opts->o_ssrr = opt;
p->ip4vars.ssrr = TRUE;
p->ip4vars.opts_set |= IPV4_OPT_FLAG_SSRR;
break;
case IPV4_OPT_RTRALT:
if (opts->o_rtralt.type != 0) {
@ -467,7 +467,7 @@ static int DecodeIPV4Options(Packet *p, uint8_t *pkt, uint16_t len, IPV4Options
return -1;
}
opts->o_rtralt = opt;
p->ip4vars.rtralt = TRUE;
p->ip4vars.opts_set |= IPV4_OPT_FLAG_RTRALT;
break;
default:
SCLogDebug("IPV4OPT <unknown> (%" PRIu8 ") len %" PRIu8,

27
src/decode-ipv4.h
Unescape Escape View File

@ -154,6 +154,20 @@ typedef struct IPV4Hdr_
memset(&p->ip4vars, 0x00, sizeof(p->ip4vars)); \
} while (0)
enum IPV4OptionFlags {
IPV4_OPT_FLAG_EOL = 0,
IPV4_OPT_FLAG_NOP,
IPV4_OPT_FLAG_RR,
IPV4_OPT_FLAG_TS,
IPV4_OPT_FLAG_QS,
IPV4_OPT_FLAG_LSRR,
IPV4_OPT_FLAG_SSRR,
IPV4_OPT_FLAG_SID,
IPV4_OPT_FLAG_SEC,
IPV4_OPT_FLAG_CIPSO,
IPV4_OPT_FLAG_RTRALT,
};
/* helper structure with parsed ipv4 info */
typedef struct IPV4Vars_
{
@ -162,18 +176,7 @@ typedef struct IPV4Vars_
uint32_t ip_dst_u32; /* dest IP */
uint16_t opt_cnt;
_Bool rr;
_Bool lsrr;
_Bool eol;
_Bool nop;
_Bool ts;
_Bool sec;
_Bool sid;
_Bool qs;
_Bool cipso;
_Bool rtralt;
_Bool ssrr;
uint16_t opts_set;
} IPV4Vars;

20
src/detect-ipopts.c
Unescape Escape View File

@ -94,28 +94,28 @@ int DetectIpOptsMatch (ThreadVars *t, DetectEngineThreadCtx *det_ctx, Packet *p,
switch (de->ipopt) {
case IPV4_OPT_RR:
return (p->ip4vars.rr);
return (p->ip4vars.opts_set & IPV4_OPT_FLAG_RR);
break;
case IPV4_OPT_LSRR:
return (p->ip4vars.lsrr);
return (p->ip4vars.opts_set & IPV4_OPT_FLAG_LSRR);
break;
case IPV4_OPT_EOL:
return (p->ip4vars.eol);
return (p->ip4vars.opts_set & IPV4_OPT_FLAG_EOL);
break;
case IPV4_OPT_NOP:
return (p->ip4vars.nop);
return (p->ip4vars.opts_set & IPV4_OPT_FLAG_NOP);
break;
case IPV4_OPT_TS:
return (p->ip4vars.ts);
return (p->ip4vars.opts_set & IPV4_OPT_FLAG_TS);
break;
case IPV4_OPT_SEC:
return (p->ip4vars.sec);
return (p->ip4vars.opts_set & IPV4_OPT_FLAG_SEC);
break;
case IPV4_OPT_SSRR:
return (p->ip4vars.ssrr);
return (p->ip4vars.opts_set & IPV4_OPT_FLAG_SSRR);
break;
case IPV4_OPT_SID:
return (p->ip4vars.sid);
return (p->ip4vars.opts_set & IPV4_OPT_FLAG_SID);
break;
}
@ -281,7 +281,7 @@ int IpOptsTestParse03 (void)
memset(&ip4h, 0, sizeof(IPV4Hdr));
p->ip4h = &ip4h;
p->ip4vars.rr = TRUE;
p->ip4vars.opts_set = IPV4_OPT_FLAG_RR;
de = DetectIpOptsParse("rr");
@ -331,7 +331,7 @@ int IpOptsTestParse04 (void)
memset(&ip4h, 0, sizeof(IPV4Hdr));
p->ip4h = &ip4h;
p->ip4vars.rr = TRUE;
p->ip4vars.opts_set = IPV4_OPT_FLAG_RR;
de = DetectIpOptsParse("lsrr");

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