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Move the code to generate code to check for a particular linktype in the 

Linux cooked header into a routine of its own.
This commit is contained in:
guy 2004-11-06 22:45:17 +00:00
parent f9b1d9732a
commit a1e08cec1e
1 changed files with 169 additions and 159 deletions
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152
gencode.c
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@ -21,7 +21,7 @@
*/
#ifndef lint
static const char rcsid[] _U_ =
"@(#) $Header: /tcpdump/master/libpcap/gencode.c,v 1.210 2004-10-19 15:55:28 hannes Exp $ (LBL)";
"@(#) $Header: /tcpdump/master/libpcap/gencode.c,v 1.211 2004-11-06 22:45:17 guy Exp $ (LBL)";
#endif
#ifdef HAVE_CONFIG_H
@ -165,6 +165,7 @@ static struct block *gen_uncond(int);
static inline struct block *gen_true(void);
static inline struct block *gen_false(void);
static struct block *gen_ether_linktype(int);
static struct block *gen_linux_sll_linktype(int);
static struct block *gen_linktype(int);
static struct block *gen_snap(bpf_u_int32, bpf_u_int32, u_int);
static struct block *gen_llc(int);
@ -1260,79 +1261,11 @@ gen_ether_linktype(proto)
}
static struct block *
gen_linktype(proto)
gen_linux_sll_linktype(proto)
register int proto;
{
struct block *b0, *b1, *b2;
struct block *b0, *b1;
switch (linktype) {
case DLT_EN10MB:
return gen_ether_linktype(proto);
/*NOTREACHED*/
break;
case DLT_C_HDLC:
switch (proto) {
case LLCSAP_ISONS:
proto = (proto << 8 | LLCSAP_ISONS);
/* fall through */
default:
return gen_cmp(off_linktype, BPF_H, (bpf_int32)proto);
/*NOTREACHED*/
break;
}
break;
case DLT_IEEE802_11:
case DLT_PRISM_HEADER:
case DLT_IEEE802_11_RADIO:
case DLT_FDDI:
case DLT_IEEE802:
case DLT_ATM_RFC1483:
case DLT_ATM_CLIP:
case DLT_IP_OVER_FC:
return gen_llc(proto);
/*NOTREACHED*/
break;
case DLT_SUNATM:
/*
* If "is_lane" is set, check for a LANE-encapsulated
* version of this protocol, otherwise check for an
* LLC-encapsulated version of this protocol.
*
* We assume LANE means Ethernet, not Token Ring.
*/
if (is_lane) {
/*
* Check that the packet doesn't begin with an
* LE Control marker. (We've already generated
* a test for LANE.)
*/
b0 = gen_cmp(SUNATM_PKT_BEGIN_POS, BPF_H, 0xFF00);
gen_not(b0);
/*
* Now generate an Ethernet test.
*/
b1 = gen_ether_linktype(proto);
gen_and(b0, b1);
return b1;
} else {
/*
* Check for LLC encapsulation and then check the
* protocol.
*/
b0 = gen_atmfield_code(A_PROTOTYPE, PT_LLC, BPF_JEQ, 0);
b1 = gen_llc(proto);
gen_and(b0, b1);
return b1;
}
case DLT_LINUX_SLL:
switch (proto) {
case LLCSAP_IP:
@ -1491,6 +1424,83 @@ gen_linktype(proto)
(bpf_int32)proto);
}
}
}
static struct block *
gen_linktype(proto)
register int proto;
{
struct block *b0, *b1, *b2;
switch (linktype) {
case DLT_EN10MB:
return gen_ether_linktype(proto);
/*NOTREACHED*/
break;
case DLT_C_HDLC:
switch (proto) {
case LLCSAP_ISONS:
proto = (proto << 8 | LLCSAP_ISONS);
/* fall through */
default:
return gen_cmp(off_linktype, BPF_H, (bpf_int32)proto);
/*NOTREACHED*/
break;
}
break;
case DLT_IEEE802_11:
case DLT_PRISM_HEADER:
case DLT_IEEE802_11_RADIO:
case DLT_FDDI:
case DLT_IEEE802:
case DLT_ATM_RFC1483:
case DLT_ATM_CLIP:
case DLT_IP_OVER_FC:
return gen_llc(proto);
/*NOTREACHED*/
break;
case DLT_SUNATM:
/*
* If "is_lane" is set, check for a LANE-encapsulated
* version of this protocol, otherwise check for an
* LLC-encapsulated version of this protocol.
*
* We assume LANE means Ethernet, not Token Ring.
*/
if (is_lane) {
/*
* Check that the packet doesn't begin with an
* LE Control marker. (We've already generated
* a test for LANE.)
*/
b0 = gen_cmp(SUNATM_PKT_BEGIN_POS, BPF_H, 0xFF00);
gen_not(b0);
/*
* Now generate an Ethernet test.
*/
b1 = gen_ether_linktype(proto);
gen_and(b0, b1);
return b1;
} else {
/*
* Check for LLC encapsulation and then check the
* protocol.
*/
b0 = gen_atmfield_code(A_PROTOTYPE, PT_LLC, BPF_JEQ, 0);
b1 = gen_llc(proto);
gen_and(b0, b1);
return b1;
}
case DLT_LINUX_SLL:
return gen_linux_sll_linktype(proto);
/*NOTREACHED*/
break;