* Modify libpcap to work a bit better with our 802.11 code. This means
tcpdump -y ieee802_11 will work in the basic senses, including the code compilation for filters (where you may specify "link[]" to refer to parts of the 802.11 header, as well as treat it like a normal Ethernet header). Previously, it was just too far off to do anything useful for us. * While I'm here, fix some compile problems that will result from lex and yacc namespace polution when linking with -lpcap. The namespace is now "pcapyy*" instead of "yy*", and it tests fine with world and some external applications that may or may not use "yy*".
This commit is contained in:
Brian Feldman
parent
a9eccd0273
commit
3267cc18e1
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=122029
@ -156,6 +156,7 @@ static struct block *gen_ahostop(const u_char *, int);
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static struct block *gen_ehostop(const u_char *, int);
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static struct block *gen_fhostop(const u_char *, int);
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static struct block *gen_thostop(const u_char *, int);
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static struct block *gen_whostop(const u_char *, int);
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static struct block *gen_dnhostop(bpf_u_int32, int, u_int);
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static struct block *gen_host(bpf_u_int32, bpf_u_int32, int, int);
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#ifdef INET6
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@ -567,11 +568,6 @@ init_linktype(type)
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off_nl = 6; /* XXX in reality, variable! */
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return;
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case DLT_IEEE802_11:
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off_linktype = 30; /* XXX variable */
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off_nl = 32;
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return;
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case DLT_EN10MB:
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off_linktype = 12;
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off_nl = 14;
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@ -667,7 +663,6 @@ init_linktype(type)
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off_nl = 22;
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return;
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#ifdef notdef
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case DLT_IEEE802_11:
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/*
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* 802.11 doesn't really have a link-level type field.
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@ -679,12 +674,13 @@ init_linktype(type)
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*
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* XXX - the header is actually variable-length. We
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* assume a 24-byte link-layer header, as appears in
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* data frames in networks with no bridges.
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* data frames in networks with no bridges. If the
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* fromds and tods 802.11 header bits are both set,
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* it's actually supposed to be 30 bytes.
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*/
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off_linktype = 24;
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off_nl = 30;
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off_nl = 32;
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return;
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#endif
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case DLT_PRISM_HEADER:
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/*
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@ -959,6 +955,7 @@ gen_linktype(proto)
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break;
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case DLT_IEEE802_11:
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return gen_snap(0x000000, proto, off_linktype);
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case DLT_PRISM_HEADER:
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case DLT_FDDI:
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case DLT_IEEE802:
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@ -1680,6 +1677,40 @@ gen_thostop(eaddr, dir)
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/* NOTREACHED */
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}
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/*
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* Like gen_ehostop, but for DLT_IEEE802_11 (Wireless)
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*/
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static struct block *
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gen_whostop(eaddr, dir)
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register const u_char *eaddr;
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register int dir;
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{
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register struct block *b0, *b1;
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switch (dir) {
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case Q_SRC:
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return gen_bcmp(10, 6, eaddr);
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case Q_DST:
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return gen_bcmp(4, 6, eaddr);
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case Q_AND:
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b0 = gen_whostop(eaddr, Q_SRC);
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b1 = gen_whostop(eaddr, Q_DST);
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gen_and(b0, b1);
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return b1;
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case Q_DEFAULT:
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case Q_OR:
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b0 = gen_whostop(eaddr, Q_SRC);
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b1 = gen_whostop(eaddr, Q_DST);
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gen_or(b0, b1);
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return b1;
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}
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abort();
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/* NOTREACHED */
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}
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/*
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* This is quite tricky because there may be pad bytes in front of the
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* DECNET header, and then there are two possible data packet formats that
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@ -2022,6 +2053,8 @@ gen_gateway(eaddr, alist, proto, dir)
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b0 = gen_fhostop(eaddr, Q_OR);
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else if (linktype == DLT_IEEE802)
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b0 = gen_thostop(eaddr, Q_OR);
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else if (linktype == DLT_IEEE802_11)
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b0 = gen_whostop(eaddr, Q_OR);
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else
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bpf_error(
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"'gateway' supported only on ethernet, FDDI or token ring");
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@ -2976,6 +3009,15 @@ gen_scode(name, q)
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free(eaddr);
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return b;
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case DLT_IEEE802_11:
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eaddr = pcap_ether_hostton(name);
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if (eaddr == NULL)
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bpf_error(
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"unknown ether host '%s'", name);
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b = gen_whostop(eaddr, dir);
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free(eaddr);
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return b;
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default:
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bpf_error(
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"only ethernet/FDDI/token ring supports link-level host name");
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@ -3337,6 +3379,8 @@ gen_ecode(eaddr, q)
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return gen_fhostop(eaddr, (int)q.dir);
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if (linktype == DLT_IEEE802)
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return gen_thostop(eaddr, (int)q.dir);
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if (linktype == DLT_IEEE802_11)
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return gen_whostop(eaddr, (int)q.dir);
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bpf_error("ethernet addresses supported only on ethernet, FDDI or token ring");
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}
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bpf_error("ethernet address used in non-ether expression");
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@ -3746,6 +3790,8 @@ gen_broadcast(proto)
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return gen_fhostop(ebroadcast, Q_DST);
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if (linktype == DLT_IEEE802)
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return gen_thostop(ebroadcast, Q_DST);
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if (linktype == DLT_IEEE802_11)
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return gen_whostop(ebroadcast, Q_DST);
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bpf_error("not a broadcast link");
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break;
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@ -69,7 +69,6 @@ static char *in_buffer;
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#define getc(fp) (*in_buffer == 0 ? EOF : *in_buffer++)
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#endif
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#define yylval pcap_lval
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extern YYSTYPE yylval;
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%}
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@ -10,7 +10,9 @@ INCS= pcap.h pcap-int.h pcap-namedb.h
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MAN= pcap.3
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CLEANFILES=tokdefs.h version.c
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CFLAGS+=-DHAVE_CONFIG_H -Dyylval=pcap_lval -I${.CURDIR} -I.
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YFLAGS+=-p pcapyy
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LFLAGS+=-Ppcapyy
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CFLAGS+=-DHAVE_CONFIG_H -Dyylval=pcapyylval -I${.CURDIR} -I.
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.if !defined(NOINET6)
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CFLAGS+=-DINET6
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.endif
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