The Prism header is in theory variable-length, but in practice it's
always 144 bytes long. However, some drivers on Linux use ARPHRD_IEEE80211_PRISM, but sometimes or always supply an AVS header, so we have to check whether the radio header is a Prism header or an AVS header, so, in practice, it's variable-length. Treat DLT_PRISM_HEADER as having a variable-length header, and generate code to find the length of the Prism header that first checks for an AVS header and, if we have an AVS header, gets the length from the header, and otherwise just gets a length of 144. This fixes Sourceforge bug 1847574. Sort various references to the radio headers (case labels, functions, etc.) into the same order (Prism, AVS, radiotap), for consistency. Put PPI after them all. Handle 802.11 and 802.11-plus-radio-header with a common case when initializing.
This commit is contained in:
guy
parent
85f4786ac2
commit
25ab78f4f7
406
gencode.c
406
gencode.c
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@ -21,7 +21,7 @@
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*/
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#ifndef lint
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static const char rcsid[] _U_ =
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"@(#) $Header: /tcpdump/master/libpcap/gencode.c,v 1.304 2007-12-29 02:34:23 guy Exp $ (LBL)";
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"@(#) $Header: /tcpdump/master/libpcap/gencode.c,v 1.305 2007-12-29 23:15:04 guy Exp $ (LBL)";
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#endif
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#ifdef HAVE_CONFIG_H
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@ -201,9 +201,10 @@ static inline struct block *gen_true(void);
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static inline struct block *gen_false(void);
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static struct block *gen_ether_linktype(int);
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static struct block *gen_linux_sll_linktype(int);
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static struct slist *gen_load_prism_llprefixlen(void);
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static struct slist *gen_load_avs_llprefixlen(void);
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static struct slist *gen_load_radiotap_llprefixlen(void);
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static struct slist *gen_load_ppi_llprefixlen(void);
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static struct slist *gen_load_avs_llprefixlen(void);
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static void insert_compute_vloffsets(struct block *);
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static struct slist *gen_llprefixlen(void);
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static struct slist *gen_off_macpl(void);
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@ -1030,6 +1031,9 @@ init_linktype(p)
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return;
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case DLT_IEEE802_11:
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case DLT_PRISM_HEADER:
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case DLT_IEEE802_11_RADIO_AVS:
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case DLT_IEEE802_11_RADIO:
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/*
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* 802.11 doesn't really have a link-level type field.
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* We set "off_linktype" to the offset of the LLC header.
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@ -1038,11 +1042,14 @@ init_linktype(p)
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* is being used and pick out the encapsulated Ethernet type.
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* XXX - should we generate code to check for SNAP?
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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. 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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* We also handle variable-length radio headers here.
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* The Prism header is in theory variable-length, but in
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* practice it's always 144 bytes long. However, some
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* drivers on Linux use ARPHRD_IEEE80211_PRISM, but
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* sometimes or always supply an AVS header, so we
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* have to check whether the radio header is a Prism
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* header or an AVS header, so, in practice, it's
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* variable-length.
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*/
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off_linktype = 24;
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off_macpl = 0; /* link-layer header is variable-length */
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@ -1051,71 +1058,15 @@ init_linktype(p)
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off_nl_nosnap = 3; /* 802.2 */
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return;
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case DLT_PRISM_HEADER:
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/*
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* Same as 802.11, but with an additional header before
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* the 802.11 header, containing a bunch of additional
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* information including radio-level information.
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*
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* The header is 144 bytes long.
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*
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* XXX - same variable-length header problem; at least
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* the Prism header is fixed-length.
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*/
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off_ll = 144;
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off_linktype = 24;
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off_macpl = 0; /* link-layer header is variable-length */
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off_macpl_is_variable = 1;
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off_nl = 8; /* 802.2+SNAP */
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off_nl_nosnap = 3; /* 802.2 */
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return;
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case DLT_IEEE802_11_RADIO_AVS:
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/*
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* Same as 802.11, but with an additional header before
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* the 802.11 header, containing a bunch of additional
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* information including radio-level information.
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*
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* The radiotap header is variable length, and we
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* generate code to compute its length and store it
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* in a register. These offsets are relative to the
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* beginning of the 802.11 header.
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*
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* XXX - in Linux, do any drivers that supply an AVS
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* header supply a link-layer type other than
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* ARPHRD_IEEE80211_PRISM? If so, we should map that
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* to DLT_IEEE802_11_RADIO_AVS; if not, or if there are
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* any drivers that supply an AVS header but supply
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* an ARPHRD value of ARPHRD_IEEE80211_PRISM, we'll
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* have to check the header in the generated code to
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* determine whether it's Prism or AVS.
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*/
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off_linktype = 24;
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off_macpl = 0; /* link-layer header is variable-length */
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off_macpl_is_variable = 1;
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off_nl = 8; /* 802.2+SNAP */
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off_nl_nosnap = 3; /* 802.2 */
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return;
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/*
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* At the moment we treat PPI as normal Radiotap encoded
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* packets. The difference is in the function that generates
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* the code at the beginning to compute the header length.
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* Since this code generator of PPI supports bare 802.11
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* encapsulation only (i.e. the encapsulated DLT should be
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* DLT_IEEE802_11) we generate code to check for this too.
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*/
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case DLT_PPI:
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case DLT_IEEE802_11_RADIO:
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/*
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* Same as 802.11, but with an additional header before
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* the 802.11 header, containing a bunch of additional
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* information including radio-level information.
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*
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* The radiotap header is variable length, and we
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* generate code to compute its length and store it
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* in a register. These offsets are relative to the
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* beginning of the 802.11 header.
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/*
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* At the moment we treat PPI the same way that we treat
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* normal Radiotap encoded packets. The difference is in
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* the function that generates the code at the beginning
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* to compute the header length. Since this code generator
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* of PPI supports bare 802.11 encapsulation only (i.e.
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* the encapsulated DLT should be DLT_IEEE802_11) we
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* generate code to check for this too.
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*/
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off_linktype = 24;
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off_macpl = 0; /* link-layer header is variable-length */
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@ -2127,6 +2078,156 @@ gen_linux_sll_linktype(proto)
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}
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}
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static struct slist *
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gen_load_prism_llprefixlen()
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{
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struct slist *s1, *s2;
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struct slist *sjeq_avs_cookie;
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struct slist *sjcommon;
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/*
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* This code is not compatible with the optimizer, as
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* we are generating jmp instructions within a normal
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* slist of instructions
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*/
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no_optimize = 1;
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/*
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* Generate code to load the length of the radio header into
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* the register assigned to hold that length, if one has been
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* assigned. (If one hasn't been assigned, no code we've
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* generated uses that prefix, so we don't need to generate any
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* code to load it.)
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*
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* Some Linux drivers use ARPHRD_IEEE80211_PRISM but sometimes
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* or always use the AVS header rather than the Prism header.
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* We load a 4-byte big-endian value at the beginning of the
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* raw packet data, and see whether, when masked with 0xFFFFF000,
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* it's equal to 0x80211000. If so, that indicates that it's
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* an AVS header (the masked-out bits are the version number).
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* Otherwise, it's a Prism header.
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*
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* XXX - the Prism header is also, in theory, variable-length,
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* but no known software generates headers that aren't 144
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* bytes long.
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*/
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if (reg_off_ll != -1) {
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/*
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* Load the cookie.
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*/
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s1 = new_stmt(BPF_LD|BPF_W|BPF_ABS);
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s1->s.k = 0;
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/*
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* AND it with 0xFFFFF000.
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*/
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s2 = new_stmt(BPF_ALU|BPF_AND|BPF_K);
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s2->s.k = 0xFFFFF000;
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sappend(s1, s2);
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/*
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* Compare with 0x80211000.
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*/
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sjeq_avs_cookie = new_stmt(JMP(BPF_JEQ));
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sjeq_avs_cookie->s.k = 0x80211000;
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sappend(s1, sjeq_avs_cookie);
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/*
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* If it's AVS:
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*
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* The 4 bytes at an offset of 4 from the beginning of
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* the AVS header are the length of the AVS header.
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* That field is big-endian.
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*/
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s2 = new_stmt(BPF_LD|BPF_W|BPF_ABS);
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s2->s.k = 4;
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sappend(s1, s2);
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sjeq_avs_cookie->s.jt = s2;
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/*
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* Now jump to the code to allocate a register
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* into which to save the header length and
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* store the length there. (The "jump always"
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* instruction needs to have the k field set;
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* it's added to the PC, so, as we're jumping
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* over a single instruction, it should be 1.)
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*/
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sjcommon = new_stmt(JMP(BPF_JA));
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sjcommon->s.k = 1;
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sappend(s1, sjcommon);
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/*
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* Now for the code that handles the Prism header.
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* Just load the length of the Prism header (144)
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* into the A register. Have the test for an AVS
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* header branch here if we don't have an AVS header.
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*/
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s2 = new_stmt(BPF_LD|BPF_W|BPF_IMM);
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s2->s.k = 144;
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sappend(s1, s2);
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sjeq_avs_cookie->s.jf = s2;
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/*
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* Now allocate a register to hold that value and store
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* it. The code for the AVS header will jump here after
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* loading the length of the AVS header.
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*/
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s2 = new_stmt(BPF_ST);
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s2->s.k = reg_off_ll;
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sappend(s1, s2);
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sjcommon->s.jf = s2;
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/*
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* Now move it into the X register.
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*/
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s2 = new_stmt(BPF_MISC|BPF_TAX);
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sappend(s1, s2);
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return (s1);
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} else
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return (NULL);
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}
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static struct slist *
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gen_load_avs_llprefixlen()
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{
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struct slist *s1, *s2;
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/*
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* Generate code to load the length of the AVS header into
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* the register assigned to hold that length, if one has been
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* assigned. (If one hasn't been assigned, no code we've
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* generated uses that prefix, so we don't need to generate any
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* code to load it.)
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*/
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if (reg_off_ll != -1) {
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/*
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* The 4 bytes at an offset of 4 from the beginning of
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* the AVS header are the length of the AVS header.
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* That field is big-endian.
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*/
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s1 = new_stmt(BPF_LD|BPF_W|BPF_ABS);
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s1->s.k = 4;
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/*
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* Now allocate a register to hold that value and store
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* it.
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*/
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s2 = new_stmt(BPF_ST);
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s2->s.k = reg_off_ll;
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sappend(s1, s2);
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/*
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* Now move it into the X register.
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*/
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s2 = new_stmt(BPF_MISC|BPF_TAX);
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sappend(s1, s2);
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return (s1);
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} else
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return (NULL);
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}
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static struct slist *
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gen_load_radiotap_llprefixlen()
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{
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@ -2256,46 +2357,6 @@ gen_load_ppi_llprefixlen()
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return (NULL);
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}
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static struct slist *
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gen_load_avs_llprefixlen()
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{
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struct slist *s1, *s2;
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/*
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* Generate code to load the length of the AVS header into
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* the register assigned to hold that length, if one has been
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* assigned. (If one hasn't been assigned, no code we've
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* generated uses that prefix, so we don't need to generate any
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* code to load it.)
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*/
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if (reg_off_ll != -1) {
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/*
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* The 4 bytes at an offset of 4 from the beginning of
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* the AVS header are the length of the AVS header.
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* That field is big-endian.
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*/
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s1 = new_stmt(BPF_LD|BPF_W|BPF_ABS);
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s1->s.k = 4;
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/*
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* Now allocate a register to hold that value and store
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* it.
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*/
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s2 = new_stmt(BPF_ST);
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s2->s.k = reg_off_ll;
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sappend(s1, s2);
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/*
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* Now move it into the X register.
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*/
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s2 = new_stmt(BPF_MISC|BPF_TAX);
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sappend(s1, s2);
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return (s1);
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} else
|
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return (NULL);
|
||||
}
|
||||
|
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/*
|
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* Load a value relative to the beginning of the link-layer header after the 802.11
|
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* header, i.e. LLC_SNAP.
|
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|
|
@ -2531,6 +2592,14 @@ insert_compute_vloffsets(b)
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*/
|
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switch (linktype) {
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case DLT_PRISM_HEADER:
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s = gen_load_prism_llprefixlen();
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break;
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case DLT_IEEE802_11_RADIO_AVS:
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s = gen_load_avs_llprefixlen();
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break;
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|
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case DLT_IEEE802_11_RADIO:
|
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s = gen_load_radiotap_llprefixlen();
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break;
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|
|
@ -2539,10 +2608,6 @@ insert_compute_vloffsets(b)
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s = gen_load_ppi_llprefixlen();
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break;
|
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|
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case DLT_IEEE802_11_RADIO_AVS:
|
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s = gen_load_avs_llprefixlen();
|
||||
break;
|
||||
|
||||
default:
|
||||
s = NULL;
|
||||
break;
|
||||
|
|
@ -2556,9 +2621,9 @@ insert_compute_vloffsets(b)
|
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switch (linktype) {
|
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|
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case DLT_IEEE802_11:
|
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case DLT_IEEE802_11_RADIO:
|
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case DLT_IEEE802_11_RADIO_AVS:
|
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case DLT_PRISM_HEADER:
|
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case DLT_IEEE802_11_RADIO_AVS:
|
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case DLT_IEEE802_11_RADIO:
|
||||
case DLT_PPI:
|
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s = gen_load_802_11_header_len(s, b->stmts);
|
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break;
|
||||
|
|
@ -2602,6 +2667,50 @@ gen_ppi_dlt_check(void)
|
|||
return b;
|
||||
}
|
||||
|
||||
static struct slist *
|
||||
gen_prism_llprefixlen(void)
|
||||
{
|
||||
struct slist *s;
|
||||
|
||||
if (reg_off_ll == -1) {
|
||||
/*
|
||||
* We haven't yet assigned a register for the length
|
||||
* of the radio header; allocate one.
|
||||
*/
|
||||
reg_off_ll = alloc_reg();
|
||||
}
|
||||
|
||||
/*
|
||||
* Load the register containing the radio length
|
||||
* into the X register.
|
||||
*/
|
||||
s = new_stmt(BPF_LDX|BPF_MEM);
|
||||
s->s.k = reg_off_ll;
|
||||
return s;
|
||||
}
|
||||
|
||||
static struct slist *
|
||||
gen_avs_llprefixlen(void)
|
||||
{
|
||||
struct slist *s;
|
||||
|
||||
if (reg_off_ll == -1) {
|
||||
/*
|
||||
* We haven't yet assigned a register for the length
|
||||
* of the AVS header; allocate one.
|
||||
*/
|
||||
reg_off_ll = alloc_reg();
|
||||
}
|
||||
|
||||
/*
|
||||
* Load the register containing the AVS length
|
||||
* into the X register.
|
||||
*/
|
||||
s = new_stmt(BPF_LDX|BPF_MEM);
|
||||
s->s.k = reg_off_ll;
|
||||
return s;
|
||||
}
|
||||
|
||||
static struct slist *
|
||||
gen_radiotap_llprefixlen(void)
|
||||
{
|
||||
|
|
@ -2654,28 +2763,6 @@ gen_ppi_llprefixlen(void)
|
|||
return s;
|
||||
}
|
||||
|
||||
static struct slist *
|
||||
gen_avs_llprefixlen(void)
|
||||
{
|
||||
struct slist *s;
|
||||
|
||||
if (reg_off_ll == -1) {
|
||||
/*
|
||||
* We haven't yet assigned a register for the length
|
||||
* of the radiotap header; allocate one.
|
||||
*/
|
||||
reg_off_ll = alloc_reg();
|
||||
}
|
||||
|
||||
/*
|
||||
* Load the register containing the AVS length
|
||||
* into the X register.
|
||||
*/
|
||||
s = new_stmt(BPF_LDX|BPF_MEM);
|
||||
s->s.k = reg_off_ll;
|
||||
return s;
|
||||
}
|
||||
|
||||
/*
|
||||
* Generate code to compute the link-layer header length, if necessary,
|
||||
* putting it into the X register, and to return either a pointer to a
|
||||
|
|
@ -2687,14 +2774,17 @@ gen_llprefixlen(void)
|
|||
{
|
||||
switch (linktype) {
|
||||
|
||||
case DLT_PPI:
|
||||
return gen_ppi_llprefixlen();
|
||||
case DLT_PRISM_HEADER:
|
||||
return gen_prism_llprefixlen();
|
||||
|
||||
case DLT_IEEE802_11_RADIO_AVS:
|
||||
return gen_avs_llprefixlen();
|
||||
|
||||
case DLT_IEEE802_11_RADIO:
|
||||
return gen_radiotap_llprefixlen();
|
||||
|
||||
case DLT_IEEE802_11_RADIO_AVS:
|
||||
return gen_avs_llprefixlen();
|
||||
case DLT_PPI:
|
||||
return gen_ppi_llprefixlen();
|
||||
|
||||
default:
|
||||
return NULL;
|
||||
|
|
@ -2860,11 +2950,11 @@ gen_linktype(proto)
|
|||
}
|
||||
break;
|
||||
|
||||
case DLT_PPI:
|
||||
case DLT_IEEE802_11:
|
||||
case DLT_IEEE802_11_RADIO:
|
||||
case DLT_IEEE802_11_RADIO_AVS:
|
||||
case DLT_PRISM_HEADER:
|
||||
case DLT_IEEE802_11_RADIO_AVS:
|
||||
case DLT_IEEE802_11_RADIO:
|
||||
case DLT_PPI:
|
||||
/*
|
||||
* Check that we have a data frame.
|
||||
*/
|
||||
|
|
@ -4406,10 +4496,10 @@ gen_gateway(eaddr, alist, proto, dir)
|
|||
b0 = gen_thostop(eaddr, Q_OR);
|
||||
break;
|
||||
case DLT_IEEE802_11:
|
||||
case DLT_IEEE802_11_RADIO_AVS:
|
||||
case DLT_PPI:
|
||||
case DLT_IEEE802_11_RADIO:
|
||||
case DLT_PRISM_HEADER:
|
||||
case DLT_IEEE802_11_RADIO_AVS:
|
||||
case DLT_IEEE802_11_RADIO:
|
||||
case DLT_PPI:
|
||||
b0 = gen_wlanhostop(eaddr, Q_OR);
|
||||
break;
|
||||
case DLT_SUNATM:
|
||||
|
|
@ -5214,9 +5304,9 @@ gen_protochain(v, proto, dir)
|
|||
switch (linktype) {
|
||||
|
||||
case DLT_IEEE802_11:
|
||||
case DLT_IEEE802_11_RADIO:
|
||||
case DLT_IEEE802_11_RADIO_AVS:
|
||||
case DLT_PRISM_HEADER:
|
||||
case DLT_IEEE802_11_RADIO_AVS:
|
||||
case DLT_IEEE802_11_RADIO:
|
||||
case DLT_PPI:
|
||||
bpf_error("'protochain' not supported with 802.11");
|
||||
}
|
||||
|
|
@ -5792,9 +5882,9 @@ gen_scode(name, q)
|
|||
return b;
|
||||
|
||||
case DLT_IEEE802_11:
|
||||
case DLT_PRISM_HEADER:
|
||||
case DLT_IEEE802_11_RADIO_AVS:
|
||||
case DLT_IEEE802_11_RADIO:
|
||||
case DLT_PRISM_HEADER:
|
||||
case DLT_PPI:
|
||||
eaddr = pcap_ether_hostton(name);
|
||||
if (eaddr == NULL)
|
||||
|
|
@ -6267,9 +6357,9 @@ gen_ecode(eaddr, q)
|
|||
case DLT_IEEE802:
|
||||
return gen_thostop(eaddr, (int)q.dir);
|
||||
case DLT_IEEE802_11:
|
||||
case DLT_PRISM_HEADER:
|
||||
case DLT_IEEE802_11_RADIO_AVS:
|
||||
case DLT_IEEE802_11_RADIO:
|
||||
case DLT_PRISM_HEADER:
|
||||
case DLT_PPI:
|
||||
return gen_wlanhostop(eaddr, (int)q.dir);
|
||||
case DLT_SUNATM:
|
||||
|
|
@ -6870,10 +6960,10 @@ gen_broadcast(proto)
|
|||
case DLT_IEEE802:
|
||||
return gen_thostop(ebroadcast, Q_DST);
|
||||
case DLT_IEEE802_11:
|
||||
case DLT_PRISM_HEADER:
|
||||
case DLT_IEEE802_11_RADIO_AVS:
|
||||
case DLT_IEEE802_11_RADIO:
|
||||
case DLT_PPI:
|
||||
case DLT_PRISM_HEADER:
|
||||
return gen_wlanhostop(ebroadcast, Q_DST);
|
||||
case DLT_IP_OVER_FC:
|
||||
return gen_ipfchostop(ebroadcast, Q_DST);
|
||||
|
|
@ -6966,10 +7056,10 @@ gen_multicast(proto)
|
|||
/* tr[2] & 1 != 0 */
|
||||
return gen_mac_multicast(2);
|
||||
case DLT_IEEE802_11:
|
||||
case DLT_IEEE802_11_RADIO_AVS:
|
||||
case DLT_PPI:
|
||||
case DLT_IEEE802_11_RADIO:
|
||||
case DLT_PRISM_HEADER:
|
||||
case DLT_IEEE802_11_RADIO_AVS:
|
||||
case DLT_IEEE802_11_RADIO:
|
||||
case DLT_PPI:
|
||||
/*
|
||||
* Oh, yuk.
|
||||
*
|
||||
|
|
@ -7415,9 +7505,9 @@ gen_p80211_fcdir(int fcdir)
|
|||
switch (linktype) {
|
||||
|
||||
case DLT_IEEE802_11:
|
||||
case DLT_PRISM_HEADER:
|
||||
case DLT_IEEE802_11_RADIO_AVS:
|
||||
case DLT_IEEE802_11_RADIO:
|
||||
case DLT_PRISM_HEADER:
|
||||
break;
|
||||
|
||||
default:
|
||||
|
|
|
|||
Reference in New Issue