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freebsd-skq/sys/net/bpf.h
melifaro 85ccef88d3 - Improve performace for writer-only BPF users. 
Linux and Solaris (at least OpenSolaris) has PF_PACKET socket families to send
raw ethernet frames. The only FreeBSD interface that can be used to send raw frames
is BPF. As a result, many programs like cdpd, lldpd, various dhcp stuff uses
BPF only to send data. This leads us to the situation when software like cdpd,
being run on high-traffic-volume interface significantly reduces overall performance
since we have to acquire additional locks for every packet.

Here we add sysctl that changes BPF behavior in the following way:
If program came and opens BPF socket without explicitly specifyin read filter we
assume it to be write-only and add it to special writer-only per-interface list.
This makes bpf_peers_present() return 0, so no additional overhead is introduced.
After filter is supplied, descriptor is added to original per-interface list permitting
packets to be captured.

Unfortunately, pcap_open_live() sets catch-all filter itself for the purpose of
setting snap length.

Fortunately, most programs explicitly sets (event catch-all) filter after that.
tcpdump(1) is a good example.

So a bit hackis approach is taken: we upgrade description only after second
BIOCSETF is received.

Sysctl is named net.bpf.optimize_writers and is turned off by default.

- While here, document all sysctl variables in bpf.4

Sponsored by Yandex LLC

Reviewed by:    glebius (previous version)
Reviewed by:    silence on -net@
Approved by:    (mentor)

MFC after:      4 weeks
2012-04-06 06:55:21 +00:00

1156 lines
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/*-
* Copyright (c) 1990, 1991, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from the Stanford/CMU enet packet filter,
* (net/enet.c) distributed as part of 4.3BSD, and code contributed
* to Berkeley by Steven McCanne and Van Jacobson both of Lawrence
* Berkeley Laboratory.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)bpf.h 8.1 (Berkeley) 6/10/93
* @(#)bpf.h 1.34 (LBL) 6/16/96
*
* $FreeBSD$
*/
#ifndef _NET_BPF_H_
#define _NET_BPF_H_
/* BSD style release date */
#define BPF_RELEASE 199606
typedef int32_t bpf_int32;
typedef u_int32_t bpf_u_int32;
typedef int64_t bpf_int64;
typedef u_int64_t bpf_u_int64;
/*
* Alignment macros. BPF_WORDALIGN rounds up to the next
* even multiple of BPF_ALIGNMENT.
*/
#define BPF_ALIGNMENT sizeof(long)
#define BPF_WORDALIGN(x) (((x)+(BPF_ALIGNMENT-1))&~(BPF_ALIGNMENT-1))
#define BPF_MAXINSNS 512
#define BPF_MAXBUFSIZE 0x80000
#define BPF_MINBUFSIZE 32
/*
* Structure for BIOCSETF.
*/
struct bpf_program {
u_int bf_len;
struct bpf_insn *bf_insns;
};
/*
* Struct returned by BIOCGSTATS.
*/
struct bpf_stat {
u_int bs_recv; /* number of packets received */
u_int bs_drop; /* number of packets dropped */
};
/*
* Struct return by BIOCVERSION. This represents the version number of
* the filter language described by the instruction encodings below.
* bpf understands a program iff kernel_major == filter_major &&
* kernel_minor >= filter_minor, that is, if the value returned by the
* running kernel has the same major number and a minor number equal
* equal to or less than the filter being downloaded. Otherwise, the
* results are undefined, meaning an error may be returned or packets
* may be accepted haphazardly.
* It has nothing to do with the source code version.
*/
struct bpf_version {
u_short bv_major;
u_short bv_minor;
};
/* Current version number of filter architecture. */
#define BPF_MAJOR_VERSION 1
#define BPF_MINOR_VERSION 1
/*
* Historically, BPF has supported a single buffering model, first using mbuf
* clusters in kernel, and later using malloc(9) buffers in kernel. We now
* support multiple buffering modes, which may be queried and set using
* BIOCGETBUFMODE and BIOCSETBUFMODE. So as to avoid handling the complexity
* of changing modes while sniffing packets, the mode becomes fixed once an
* interface has been attached to the BPF descriptor.
*/
#define BPF_BUFMODE_BUFFER 1 /* Kernel buffers with read(). */
#define BPF_BUFMODE_ZBUF 2 /* Zero-copy buffers. */
/*-
* Struct used by BIOCSETZBUF, BIOCROTZBUF: describes up to two zero-copy
* buffer as used by BPF.
*/
struct bpf_zbuf {
void *bz_bufa; /* Location of 'a' zero-copy buffer. */
void *bz_bufb; /* Location of 'b' zero-copy buffer. */
size_t bz_buflen; /* Size of zero-copy buffers. */
};
#define BIOCGBLEN _IOR('B', 102, u_int)
#define BIOCSBLEN _IOWR('B', 102, u_int)
#define BIOCSETF _IOW('B', 103, struct bpf_program)
#define BIOCFLUSH _IO('B', 104)
#define BIOCPROMISC _IO('B', 105)
#define BIOCGDLT _IOR('B', 106, u_int)
#define BIOCGETIF _IOR('B', 107, struct ifreq)
#define BIOCSETIF _IOW('B', 108, struct ifreq)
#define BIOCSRTIMEOUT _IOW('B', 109, struct timeval)
#define BIOCGRTIMEOUT _IOR('B', 110, struct timeval)
#define BIOCGSTATS _IOR('B', 111, struct bpf_stat)
#define BIOCIMMEDIATE _IOW('B', 112, u_int)
#define BIOCVERSION _IOR('B', 113, struct bpf_version)
#define BIOCGRSIG _IOR('B', 114, u_int)
#define BIOCSRSIG _IOW('B', 115, u_int)
#define BIOCGHDRCMPLT _IOR('B', 116, u_int)
#define BIOCSHDRCMPLT _IOW('B', 117, u_int)
#define BIOCGDIRECTION _IOR('B', 118, u_int)
#define BIOCSDIRECTION _IOW('B', 119, u_int)
#define BIOCSDLT _IOW('B', 120, u_int)
#define BIOCGDLTLIST _IOWR('B', 121, struct bpf_dltlist)
#define BIOCLOCK _IO('B', 122)
#define BIOCSETWF _IOW('B', 123, struct bpf_program)
#define BIOCFEEDBACK _IOW('B', 124, u_int)
#define BIOCGETBUFMODE _IOR('B', 125, u_int)
#define BIOCSETBUFMODE _IOW('B', 126, u_int)
#define BIOCGETZMAX _IOR('B', 127, size_t)
#define BIOCROTZBUF _IOR('B', 128, struct bpf_zbuf)
#define BIOCSETZBUF _IOW('B', 129, struct bpf_zbuf)
#define BIOCSETFNR _IOW('B', 130, struct bpf_program)
#define BIOCGTSTAMP _IOR('B', 131, u_int)
#define BIOCSTSTAMP _IOW('B', 132, u_int)
/* Obsolete */
#define BIOCGSEESENT BIOCGDIRECTION
#define BIOCSSEESENT BIOCSDIRECTION
/* Packet directions */
enum bpf_direction {
BPF_D_IN, /* See incoming packets */
BPF_D_INOUT, /* See incoming and outgoing packets */
BPF_D_OUT /* See outgoing packets */
};
/* Time stamping functions */
#define BPF_T_MICROTIME 0x0000
#define BPF_T_NANOTIME 0x0001
#define BPF_T_BINTIME 0x0002
#define BPF_T_NONE 0x0003
#define BPF_T_FORMAT_MASK 0x0003
#define BPF_T_NORMAL 0x0000
#define BPF_T_FAST 0x0100
#define BPF_T_MONOTONIC 0x0200
#define BPF_T_MONOTONIC_FAST (BPF_T_FAST | BPF_T_MONOTONIC)
#define BPF_T_FLAG_MASK 0x0300
#define BPF_T_FORMAT(t) ((t) & BPF_T_FORMAT_MASK)
#define BPF_T_FLAG(t) ((t) & BPF_T_FLAG_MASK)
#define BPF_T_VALID(t) \
((t) == BPF_T_NONE || (BPF_T_FORMAT(t) != BPF_T_NONE && \
((t) & ~(BPF_T_FORMAT_MASK | BPF_T_FLAG_MASK)) == 0))
#define BPF_T_MICROTIME_FAST (BPF_T_MICROTIME | BPF_T_FAST)
#define BPF_T_NANOTIME_FAST (BPF_T_NANOTIME | BPF_T_FAST)
#define BPF_T_BINTIME_FAST (BPF_T_BINTIME | BPF_T_FAST)
#define BPF_T_MICROTIME_MONOTONIC (BPF_T_MICROTIME | BPF_T_MONOTONIC)
#define BPF_T_NANOTIME_MONOTONIC (BPF_T_NANOTIME | BPF_T_MONOTONIC)
#define BPF_T_BINTIME_MONOTONIC (BPF_T_BINTIME | BPF_T_MONOTONIC)
#define BPF_T_MICROTIME_MONOTONIC_FAST (BPF_T_MICROTIME | BPF_T_MONOTONIC_FAST)
#define BPF_T_NANOTIME_MONOTONIC_FAST (BPF_T_NANOTIME | BPF_T_MONOTONIC_FAST)
#define BPF_T_BINTIME_MONOTONIC_FAST (BPF_T_BINTIME | BPF_T_MONOTONIC_FAST)
/*
* Structure prepended to each packet.
*/
struct bpf_ts {
bpf_int64 bt_sec; /* seconds */
bpf_u_int64 bt_frac; /* fraction */
};
struct bpf_xhdr {
struct bpf_ts bh_tstamp; /* time stamp */
bpf_u_int32 bh_caplen; /* length of captured portion */
bpf_u_int32 bh_datalen; /* original length of packet */
u_short bh_hdrlen; /* length of bpf header (this struct
plus alignment padding) */
};
/* Obsolete */
struct bpf_hdr {
struct timeval bh_tstamp; /* time stamp */
bpf_u_int32 bh_caplen; /* length of captured portion */
bpf_u_int32 bh_datalen; /* original length of packet */
u_short bh_hdrlen; /* length of bpf header (this struct
plus alignment padding) */
};
#ifdef _KERNEL
#define MTAG_BPF 0x627066
#define MTAG_BPF_TIMESTAMP 0
#endif
/*
* When using zero-copy BPF buffers, a shared memory header is present
* allowing the kernel BPF implementation and user process to synchronize
* without using system calls. This structure defines that header. When
* accessing these fields, appropriate atomic operation and memory barriers
* are required in order not to see stale or out-of-order data; see bpf(4)
* for reference code to access these fields from userspace.
*
* The layout of this structure is critical, and must not be changed; if must
* fit in a single page on all architectures.
*/
struct bpf_zbuf_header {
volatile u_int bzh_kernel_gen; /* Kernel generation number. */
volatile u_int bzh_kernel_len; /* Length of data in the buffer. */
volatile u_int bzh_user_gen; /* User generation number. */
u_int _bzh_pad[5];
};
/*
* Data-link level type codes.
*/
#define DLT_NULL 0 /* BSD loopback encapsulation */
#define DLT_EN10MB 1 /* Ethernet (10Mb) */
#define DLT_EN3MB 2 /* Experimental Ethernet (3Mb) */
#define DLT_AX25 3 /* Amateur Radio AX.25 */
#define DLT_PRONET 4 /* Proteon ProNET Token Ring */
#define DLT_CHAOS 5 /* Chaos */
#define DLT_IEEE802 6 /* IEEE 802 Networks */
#define DLT_ARCNET 7 /* ARCNET */
#define DLT_SLIP 8 /* Serial Line IP */
#define DLT_PPP 9 /* Point-to-point Protocol */
#define DLT_FDDI 10 /* FDDI */
#define DLT_ATM_RFC1483 11 /* LLC/SNAP encapsulated atm */
#define DLT_RAW 12 /* raw IP */
/*
* These are values from BSD/OS's "bpf.h".
* These are not the same as the values from the traditional libpcap
* "bpf.h"; however, these values shouldn't be generated by any
* OS other than BSD/OS, so the correct values to use here are the
* BSD/OS values.
*
* Platforms that have already assigned these values to other
* DLT_ codes, however, should give these codes the values
* from that platform, so that programs that use these codes will
* continue to compile - even though they won't correctly read
* files of these types.
*/
#define DLT_SLIP_BSDOS 15 /* BSD/OS Serial Line IP */
#define DLT_PPP_BSDOS 16 /* BSD/OS Point-to-point Protocol */
#define DLT_ATM_CLIP 19 /* Linux Classical-IP over ATM */
/*
* These values are defined by NetBSD; other platforms should refrain from
* using them for other purposes, so that NetBSD savefiles with link
* types of 50 or 51 can be read as this type on all platforms.
*/
#define DLT_PPP_SERIAL 50 /* PPP over serial with HDLC encapsulation */
#define DLT_PPP_ETHER 51 /* PPP over Ethernet */
/*
* Reserved for the Symantec Enterprise Firewall.
*/
#define DLT_SYMANTEC_FIREWALL 99
/*
* This value was defined by libpcap 0.5; platforms that have defined
* it with a different value should define it here with that value -
* a link type of 104 in a save file will be mapped to DLT_C_HDLC,
* whatever value that happens to be, so programs will correctly
* handle files with that link type regardless of the value of
* DLT_C_HDLC.
*
* The name DLT_C_HDLC was used by BSD/OS; we use that name for source
* compatibility with programs written for BSD/OS.
*
* libpcap 0.5 defined it as DLT_CHDLC; we define DLT_CHDLC as well,
* for source compatibility with programs written for libpcap 0.5.
*/
#define DLT_C_HDLC 104 /* Cisco HDLC */
#define DLT_CHDLC DLT_C_HDLC
#define DLT_IEEE802_11 105 /* IEEE 802.11 wireless */
/*
* Values between 106 and 107 are used in capture file headers as
* link-layer types corresponding to DLT_ types that might differ
* between platforms; don't use those values for new DLT_ new types.
*/
/*
* Frame Relay; BSD/OS has a DLT_FR with a value of 11, but that collides
* with other values.
* DLT_FR and DLT_FRELAY packets start with the Q.922 Frame Relay header
* (DLCI, etc.).
*/
#define DLT_FRELAY 107
/*
* OpenBSD DLT_LOOP, for loopback devices; it's like DLT_NULL, except
* that the AF_ type in the link-layer header is in network byte order.
*
* OpenBSD defines it as 12, but that collides with DLT_RAW, so we
* define it as 108 here. If OpenBSD picks up this file, it should
* define DLT_LOOP as 12 in its version, as per the comment above -
* and should not use 108 as a DLT_ value.
*/
#define DLT_LOOP 108
/*
* Values between 109 and 112 are used in capture file headers as
* link-layer types corresponding to DLT_ types that might differ
* between platforms; don't use those values for new DLT_ new types.
*/
/*
* Encapsulated packets for IPsec; DLT_ENC is 13 in OpenBSD, but that's
* DLT_SLIP_BSDOS in NetBSD, so we don't use 13 for it in OSes other
* than OpenBSD.
*/
#define DLT_ENC 109
/*
* This is for Linux cooked sockets.
*/
#define DLT_LINUX_SLL 113
/*
* Apple LocalTalk hardware.
*/
#define DLT_LTALK 114
/*
* Acorn Econet.
*/
#define DLT_ECONET 115
/*
* Reserved for use with OpenBSD ipfilter.
*/
#define DLT_IPFILTER 116
/*
* Reserved for use in capture-file headers as a link-layer type
* corresponding to OpenBSD DLT_PFLOG; DLT_PFLOG is 17 in OpenBSD,
* but that's DLT_LANE8023 in SuSE 6.3, so we can't use 17 for it
* in capture-file headers.
*/
#define DLT_PFLOG 117
/*
* Registered for Cisco-internal use.
*/
#define DLT_CISCO_IOS 118
/*
* Reserved for 802.11 cards using the Prism II chips, with a link-layer
* header including Prism monitor mode information plus an 802.11
* header.
*/
#define DLT_PRISM_HEADER 119
/*
* Reserved for Aironet 802.11 cards, with an Aironet link-layer header
* (see Doug Ambrisko's FreeBSD patches).
*/
#define DLT_AIRONET_HEADER 120
/*
* Reserved for use by OpenBSD's pfsync device.
*/
#define DLT_PFSYNC 121
/*
* Reserved for Siemens HiPath HDLC. XXX
*/
#define DLT_HHDLC 121
/*
* Reserved for RFC 2625 IP-over-Fibre Channel.
*/
#define DLT_IP_OVER_FC 122
/*
* Reserved for Full Frontal ATM on Solaris.
*/
#define DLT_SUNATM 123
/*
* Reserved as per request from Kent Dahlgren <kent@praesum.com>
* for private use.
*/
#define DLT_RIO 124 /* RapidIO */
#define DLT_PCI_EXP 125 /* PCI Express */
#define DLT_AURORA 126 /* Xilinx Aurora link layer */
/*
* BSD header for 802.11 plus a number of bits of link-layer information
* including radio information.
*/
#ifndef DLT_IEEE802_11_RADIO
#define DLT_IEEE802_11_RADIO 127
#endif
/*
* Reserved for TZSP encapsulation.
*/
#define DLT_TZSP 128 /* Tazmen Sniffer Protocol */
/*
* Reserved for Linux ARCNET.
*/
#define DLT_ARCNET_LINUX 129
/*
* Juniper-private data link types.
*/
#define DLT_JUNIPER_MLPPP 130
#define DLT_JUNIPER_MLFR 131
#define DLT_JUNIPER_ES 132
#define DLT_JUNIPER_GGSN 133
#define DLT_JUNIPER_MFR 134
#define DLT_JUNIPER_ATM2 135
#define DLT_JUNIPER_SERVICES 136
#define DLT_JUNIPER_ATM1 137
/*
* Apple IP-over-IEEE 1394, as per a request from Dieter Siegmund
* <dieter@apple.com>. The header that's presented is an Ethernet-like
* header:
*
* #define FIREWIRE_EUI64_LEN 8
* struct firewire_header {
* u_char firewire_dhost[FIREWIRE_EUI64_LEN];
* u_char firewire_shost[FIREWIRE_EUI64_LEN];
* u_short firewire_type;
* };
*
* with "firewire_type" being an Ethernet type value, rather than,
* for example, raw GASP frames being handed up.
*/
#define DLT_APPLE_IP_OVER_IEEE1394 138
/*
* Various SS7 encapsulations, as per a request from Jeff Morriss
* <jeff.morriss[AT]ulticom.com> and subsequent discussions.
*/
#define DLT_MTP2_WITH_PHDR 139 /* pseudo-header with various info, followed by MTP2 */
#define DLT_MTP2 140 /* MTP2, without pseudo-header */
#define DLT_MTP3 141 /* MTP3, without pseudo-header or MTP2 */
#define DLT_SCCP 142 /* SCCP, without pseudo-header or MTP2 or MTP3 */
/*
* Reserved for DOCSIS.
*/
#define DLT_DOCSIS 143
/*
* Reserved for Linux IrDA.
*/
#define DLT_LINUX_IRDA 144
/*
* Reserved for IBM SP switch and IBM Next Federation switch.
*/
#define DLT_IBM_SP 145
#define DLT_IBM_SN 146
/*
* Reserved for private use. If you have some link-layer header type
* that you want to use within your organization, with the capture files
* using that link-layer header type not ever be sent outside your
* organization, you can use these values.
*
* No libpcap release will use these for any purpose, nor will any
* tcpdump release use them, either.
*
* Do *NOT* use these in capture files that you expect anybody not using
* your private versions of capture-file-reading tools to read; in
* particular, do *NOT* use them in products, otherwise you may find that
* people won't be able to use tcpdump, or snort, or Ethereal, or... to
* read capture files from your firewall/intrusion detection/traffic
* monitoring/etc. appliance, or whatever product uses that DLT_ value,
* and you may also find that the developers of those applications will
* not accept patches to let them read those files.
*
* Also, do not use them if somebody might send you a capture using them
* for *their* private type and tools using them for *your* private type
* would have to read them.
*
* Instead, ask "tcpdump-workers@tcpdump.org" for a new DLT_ value,
* as per the comment above, and use the type you're given.
*/
#define DLT_USER0 147
#define DLT_USER1 148
#define DLT_USER2 149
#define DLT_USER3 150
#define DLT_USER4 151
#define DLT_USER5 152
#define DLT_USER6 153
#define DLT_USER7 154
#define DLT_USER8 155
#define DLT_USER9 156
#define DLT_USER10 157
#define DLT_USER11 158
#define DLT_USER12 159
#define DLT_USER13 160
#define DLT_USER14 161
#define DLT_USER15 162
/*
* For future use with 802.11 captures - defined by AbsoluteValue
* Systems to store a number of bits of link-layer information
* including radio information:
*
* http://www.shaftnet.org/~pizza/software/capturefrm.txt
*
* but it might be used by some non-AVS drivers now or in the
* future.
*/
#define DLT_IEEE802_11_RADIO_AVS 163 /* 802.11 plus AVS radio header */
/*
* Juniper-private data link type, as per request from
* Hannes Gredler <hannes@juniper.net>. The DLT_s are used
* for passing on chassis-internal metainformation such as
* QOS profiles, etc..
*/
#define DLT_JUNIPER_MONITOR 164
/*
* Reserved for BACnet MS/TP.
*/
#define DLT_BACNET_MS_TP 165
/*
* Another PPP variant as per request from Karsten Keil <kkeil@suse.de>.
*
* This is used in some OSes to allow a kernel socket filter to distinguish
* between incoming and outgoing packets, on a socket intended to
* supply pppd with outgoing packets so it can do dial-on-demand and
* hangup-on-lack-of-demand; incoming packets are filtered out so they
* don't cause pppd to hold the connection up (you don't want random
* input packets such as port scans, packets from old lost connections,
* etc. to force the connection to stay up).
*
* The first byte of the PPP header (0xff03) is modified to accomodate
* the direction - 0x00 = IN, 0x01 = OUT.
*/
#define DLT_PPP_PPPD 166
/*
* Names for backwards compatibility with older versions of some PPP
* software; new software should use DLT_PPP_PPPD.
*/
#define DLT_PPP_WITH_DIRECTION DLT_PPP_PPPD
#define DLT_LINUX_PPP_WITHDIRECTION DLT_PPP_PPPD
/*
* Juniper-private data link type, as per request from
* Hannes Gredler <hannes@juniper.net>. The DLT_s are used
* for passing on chassis-internal metainformation such as
* QOS profiles, cookies, etc..
*/
#define DLT_JUNIPER_PPPOE 167
#define DLT_JUNIPER_PPPOE_ATM 168
#define DLT_GPRS_LLC 169 /* GPRS LLC */
#define DLT_GPF_T 170 /* GPF-T (ITU-T G.7041/Y.1303) */
#define DLT_GPF_F 171 /* GPF-F (ITU-T G.7041/Y.1303) */
/*
* Requested by Oolan Zimmer <oz@gcom.com> for use in Gcom's T1/E1 line
* monitoring equipment.
*/
#define DLT_GCOM_T1E1 172
#define DLT_GCOM_SERIAL 173
/*
* Juniper-private data link type, as per request from
* Hannes Gredler <hannes@juniper.net>. The DLT_ is used
* for internal communication to Physical Interface Cards (PIC)
*/
#define DLT_JUNIPER_PIC_PEER 174
/*
* Link types requested by Gregor Maier <gregor@endace.com> of Endace
* Measurement Systems. They add an ERF header (see
* http://www.endace.com/support/EndaceRecordFormat.pdf) in front of
* the link-layer header.
*/
#define DLT_ERF_ETH 175 /* Ethernet */
#define DLT_ERF_POS 176 /* Packet-over-SONET */
/*
* Requested by Daniele Orlandi <daniele@orlandi.com> for raw LAPD
* for vISDN (http://www.orlandi.com/visdn/). Its link-layer header
* includes additional information before the LAPD header, so it's
* not necessarily a generic LAPD header.
*/
#define DLT_LINUX_LAPD 177
/*
* Juniper-private data link type, as per request from
* Hannes Gredler <hannes@juniper.net>.
* The DLT_ are used for prepending meta-information
* like interface index, interface name
* before standard Ethernet, PPP, Frelay & C-HDLC Frames
*/
#define DLT_JUNIPER_ETHER 178
#define DLT_JUNIPER_PPP 179
#define DLT_JUNIPER_FRELAY 180
#define DLT_JUNIPER_CHDLC 181
/*
* Multi Link Frame Relay (FRF.16)
*/
#define DLT_MFR 182
/*
* Juniper-private data link type, as per request from
* Hannes Gredler <hannes@juniper.net>.
* The DLT_ is used for internal communication with a
* voice Adapter Card (PIC)
*/
#define DLT_JUNIPER_VP 183
/*
* Arinc 429 frames.
* DLT_ requested by Gianluca Varenni <gianluca.varenni@cacetech.com>.
* Every frame contains a 32bit A429 label.
* More documentation on Arinc 429 can be found at
* http://www.condoreng.com/support/downloads/tutorials/ARINCTutorial.pdf
*/
#define DLT_A429 184
/*
* Arinc 653 Interpartition Communication messages.
* DLT_ requested by Gianluca Varenni <gianluca.varenni@cacetech.com>.
* Please refer to the A653-1 standard for more information.
*/
#define DLT_A653_ICM 185
/*
* USB packets, beginning with a USB setup header; requested by
* Paolo Abeni <paolo.abeni@email.it>.
*/
#define DLT_USB 186
/*
* Bluetooth HCI UART transport layer (part H:4); requested by
* Paolo Abeni.
*/
#define DLT_BLUETOOTH_HCI_H4 187
/*
* IEEE 802.16 MAC Common Part Sublayer; requested by Maria Cruz
* <cruz_petagay@bah.com>.
*/
#define DLT_IEEE802_16_MAC_CPS 188
/*
* USB packets, beginning with a Linux USB header; requested by
* Paolo Abeni <paolo.abeni@email.it>.
*/
#define DLT_USB_LINUX 189
/*
* Controller Area Network (CAN) v. 2.0B packets.
* DLT_ requested by Gianluca Varenni <gianluca.varenni@cacetech.com>.
* Used to dump CAN packets coming from a CAN Vector board.
* More documentation on the CAN v2.0B frames can be found at
* http://www.can-cia.org/downloads/?269
*/
#define DLT_CAN20B 190
/*
* IEEE 802.15.4, with address fields padded, as is done by Linux
* drivers; requested by Juergen Schimmer.
*/
#define DLT_IEEE802_15_4_LINUX 191
/*
* Per Packet Information encapsulated packets.
* DLT_ requested by Gianluca Varenni <gianluca.varenni@cacetech.com>.
*/
#define DLT_PPI 192
/*
* Header for 802.16 MAC Common Part Sublayer plus a radiotap radio header;
* requested by Charles Clancy.
*/
#define DLT_IEEE802_16_MAC_CPS_RADIO 193
/*
* Juniper-private data link type, as per request from
* Hannes Gredler <hannes@juniper.net>.
* The DLT_ is used for internal communication with a
* integrated service module (ISM).
*/
#define DLT_JUNIPER_ISM 194
/*
* IEEE 802.15.4, exactly as it appears in the spec (no padding, no
* nothing); requested by Mikko Saarnivala <mikko.saarnivala@sensinode.com>.
*/
#define DLT_IEEE802_15_4 195
/*
* Various link-layer types, with a pseudo-header, for SITA
* (http://www.sita.aero/); requested by Fulko Hew (fulko.hew@gmail.com).
*/
#define DLT_SITA 196
/*
* Various link-layer types, with a pseudo-header, for Endace DAG cards;
* encapsulates Endace ERF records. Requested by Stephen Donnelly
* <stephen@endace.com>.
*/
#define DLT_ERF 197
/*
* Special header prepended to Ethernet packets when capturing from a
* u10 Networks board. Requested by Phil Mulholland
* <phil@u10networks.com>.
*/
#define DLT_RAIF1 198
/*
* IPMB packet for IPMI, beginning with the I2C slave address, followed
* by the netFn and LUN, etc.. Requested by Chanthy Toeung
* <chanthy.toeung@ca.kontron.com>.
*/
#define DLT_IPMB 199
/*
* Juniper-private data link type, as per request from
* Hannes Gredler <hannes@juniper.net>.
* The DLT_ is used for capturing data on a secure tunnel interface.
*/
#define DLT_JUNIPER_ST 200
/*
* Bluetooth HCI UART transport layer (part H:4), with pseudo-header
* that includes direction information; requested by Paolo Abeni.
*/
#define DLT_BLUETOOTH_HCI_H4_WITH_PHDR 201
/*
* AX.25 packet with a 1-byte KISS header; see
*
* http://www.ax25.net/kiss.htm
*
* as per Richard Stearn <richard@rns-stearn.demon.co.uk>.
*/
#define DLT_AX25_KISS 202
/*
* LAPD packets from an ISDN channel, starting with the address field,
* with no pseudo-header.
* Requested by Varuna De Silva <varunax@gmail.com>.
*/
#define DLT_LAPD 203
/*
* Variants of various link-layer headers, with a one-byte direction
* pseudo-header prepended - zero means "received by this host",
* non-zero (any non-zero value) means "sent by this host" - as per
* Will Barker <w.barker@zen.co.uk>.
*/
#define DLT_PPP_WITH_DIR 204 /* PPP - don't confuse with DLT_PPP_WITH_DIRECTION */
#define DLT_C_HDLC_WITH_DIR 205 /* Cisco HDLC */
#define DLT_FRELAY_WITH_DIR 206 /* Frame Relay */
#define DLT_LAPB_WITH_DIR 207 /* LAPB */
/*
* 208 is reserved for an as-yet-unspecified proprietary link-layer
* type, as requested by Will Barker.
*/
/*
* IPMB with a Linux-specific pseudo-header; as requested by Alexey Neyman
* <avn@pigeonpoint.com>.
*/
#define DLT_IPMB_LINUX 209
/*
* FlexRay automotive bus - http://www.flexray.com/ - as requested
* by Hannes Kaelber <hannes.kaelber@x2e.de>.
*/
#define DLT_FLEXRAY 210
/*
* Media Oriented Systems Transport (MOST) bus for multimedia
* transport - http://www.mostcooperation.com/ - as requested
* by Hannes Kaelber <hannes.kaelber@x2e.de>.
*/
#define DLT_MOST 211
/*
* Local Interconnect Network (LIN) bus for vehicle networks -
* http://www.lin-subbus.org/ - as requested by Hannes Kaelber
* <hannes.kaelber@x2e.de>.
*/
#define DLT_LIN 212
/*
* X2E-private data link type used for serial line capture,
* as requested by Hannes Kaelber <hannes.kaelber@x2e.de>.
*/
#define DLT_X2E_SERIAL 213
/*
* X2E-private data link type used for the Xoraya data logger
* family, as requested by Hannes Kaelber <hannes.kaelber@x2e.de>.
*/
#define DLT_X2E_XORAYA 214
/*
* IEEE 802.15.4, exactly as it appears in the spec (no padding, no
* nothing), but with the PHY-level data for non-ASK PHYs (4 octets
* of 0 as preamble, one octet of SFD, one octet of frame length+
* reserved bit, and then the MAC-layer data, starting with the
* frame control field).
*
* Requested by Max Filippov <jcmvbkbc@gmail.com>.
*/
#define DLT_IEEE802_15_4_NONASK_PHY 215
/*
* David Gibson <david@gibson.dropbear.id.au> requested this for
* captures from the Linux kernel /dev/input/eventN devices. This
* is used to communicate keystrokes and mouse movements from the
* Linux kernel to display systems, such as Xorg.
*/
#define DLT_LINUX_EVDEV 216
/*
* GSM Um and Abis interfaces, preceded by a "gsmtap" header.
*
* Requested by Harald Welte <laforge@gnumonks.org>.
*/
#define DLT_GSMTAP_UM 217
#define DLT_GSMTAP_ABIS 218
/*
* MPLS, with an MPLS label as the link-layer header.
* Requested by Michele Marchetto <michele@openbsd.org> on behalf
* of OpenBSD.
*/
#define DLT_MPLS 219
/*
* USB packets, beginning with a Linux USB header, with the USB header
* padded to 64 bytes; required for memory-mapped access.
*/
#define DLT_USB_LINUX_MMAPPED 220
/*
* DECT packets, with a pseudo-header; requested by
* Matthias Wenzel <tcpdump@mazzoo.de>.
*/
#define DLT_DECT 221
/*
* From: "Lidwa, Eric (GSFC-582.0)[SGT INC]" <eric.lidwa-1@nasa.gov>
* Date: Mon, 11 May 2009 11:18:30 -0500
*
* DLT_AOS. We need it for AOS Space Data Link Protocol.
* I have already written dissectors for but need an OK from
* legal before I can submit a patch.
*
*/
#define DLT_AOS 222
/*
* Wireless HART (Highway Addressable Remote Transducer)
* From the HART Communication Foundation
* IES/PAS 62591
*
* Requested by Sam Roberts <vieuxtech@gmail.com>.
*/
#define DLT_WIHART 223
/*
* Fibre Channel FC-2 frames, beginning with a Frame_Header.
* Requested by Kahou Lei <kahou82@gmail.com>.
*/
#define DLT_FC_2 224
/*
* Fibre Channel FC-2 frames, beginning with an encoding of the
* SOF, and ending with an encoding of the EOF.
*
* The encodings represent the frame delimiters as 4-byte sequences
* representing the corresponding ordered sets, with K28.5
* represented as 0xBC, and the D symbols as the corresponding
* byte values; for example, SOFi2, which is K28.5 - D21.5 - D1.2 - D21.2,
* is represented as 0xBC 0xB5 0x55 0x55.
*
* Requested by Kahou Lei <kahou82@gmail.com>.
*/
#define DLT_FC_2_WITH_FRAME_DELIMS 225
/*
* Solaris ipnet pseudo-header; requested by Darren Reed <Darren.Reed@Sun.COM>.
*
* The pseudo-header starts with a one-byte version number; for version 2,
* the pseudo-header is:
*
* struct dl_ipnetinfo {
* u_int8_t dli_version;
* u_int8_t dli_family;
* u_int16_t dli_htype;
* u_int32_t dli_pktlen;
* u_int32_t dli_ifindex;
* u_int32_t dli_grifindex;
* u_int32_t dli_zsrc;
* u_int32_t dli_zdst;
* };
*
* dli_version is 2 for the current version of the pseudo-header.
*
* dli_family is a Solaris address family value, so it's 2 for IPv4
* and 26 for IPv6.
*
* dli_htype is a "hook type" - 0 for incoming packets, 1 for outgoing
* packets, and 2 for packets arriving from another zone on the same
* machine.
*
* dli_pktlen is the length of the packet data following the pseudo-header
* (so the captured length minus dli_pktlen is the length of the
* pseudo-header, assuming the entire pseudo-header was captured).
*
* dli_ifindex is the interface index of the interface on which the
* packet arrived.
*
* dli_grifindex is the group interface index number (for IPMP interfaces).
*
* dli_zsrc is the zone identifier for the source of the packet.
*
* dli_zdst is the zone identifier for the destination of the packet.
*
* A zone number of 0 is the global zone; a zone number of 0xffffffff
* means that the packet arrived from another host on the network, not
* from another zone on the same machine.
*
* An IPv4 or IPv6 datagram follows the pseudo-header; dli_family indicates
* which of those it is.
*/
#define DLT_IPNET 226
/*
* CAN (Controller Area Network) frames, with a pseudo-header as supplied
* by Linux SocketCAN. See Documentation/networking/can.txt in the Linux
* source.
*
* Requested by Felix Obenhuber <felix@obenhuber.de>.
*/
#define DLT_CAN_SOCKETCAN 227
/*
* Raw IPv4/IPv6; different from DLT_RAW in that the DLT_ value specifies
* whether it's v4 or v6. Requested by Darren Reed <Darren.Reed@Sun.COM>.
*/
#define DLT_IPV4 228
#define DLT_IPV6 229
/*
* DLT and savefile link type values are split into a class and
* a member of that class. A class value of 0 indicates a regular
* DLT_/LINKTYPE_ value.
*/
#define DLT_CLASS(x) ((x) & 0x03ff0000)
/*
* The instruction encodings.
*/
/* instruction classes */
#define BPF_CLASS(code) ((code) & 0x07)
#define BPF_LD 0x00
#define BPF_LDX 0x01
#define BPF_ST 0x02
#define BPF_STX 0x03
#define BPF_ALU 0x04
#define BPF_JMP 0x05
#define BPF_RET 0x06
#define BPF_MISC 0x07
/* ld/ldx fields */
#define BPF_SIZE(code) ((code) & 0x18)
#define BPF_W 0x00
#define BPF_H 0x08
#define BPF_B 0x10
#define BPF_MODE(code) ((code) & 0xe0)
#define BPF_IMM 0x00
#define BPF_ABS 0x20
#define BPF_IND 0x40
#define BPF_MEM 0x60
#define BPF_LEN 0x80
#define BPF_MSH 0xa0
/* alu/jmp fields */
#define BPF_OP(code) ((code) & 0xf0)
#define BPF_ADD 0x00
#define BPF_SUB 0x10
#define BPF_MUL 0x20
#define BPF_DIV 0x30
#define BPF_OR 0x40
#define BPF_AND 0x50
#define BPF_LSH 0x60
#define BPF_RSH 0x70
#define BPF_NEG 0x80
#define BPF_JA 0x00
#define BPF_JEQ 0x10
#define BPF_JGT 0x20
#define BPF_JGE 0x30
#define BPF_JSET 0x40
#define BPF_SRC(code) ((code) & 0x08)
#define BPF_K 0x00
#define BPF_X 0x08
/* ret - BPF_K and BPF_X also apply */
#define BPF_RVAL(code) ((code) & 0x18)
#define BPF_A 0x10
/* misc */
#define BPF_MISCOP(code) ((code) & 0xf8)
#define BPF_TAX 0x00
#define BPF_TXA 0x80
/*
* The instruction data structure.
*/
struct bpf_insn {
u_short code;
u_char jt;
u_char jf;
bpf_u_int32 k;
};
/*
* Macros for insn array initializers.
*/
#define BPF_STMT(code, k) { (u_short)(code), 0, 0, k }
#define BPF_JUMP(code, k, jt, jf) { (u_short)(code), jt, jf, k }
/*
* Structure to retrieve available DLTs for the interface.
*/
struct bpf_dltlist {
u_int bfl_len; /* number of bfd_list array */
u_int *bfl_list; /* array of DLTs */
};
#ifdef _KERNEL
#ifdef MALLOC_DECLARE
MALLOC_DECLARE(M_BPF);
#endif
#ifdef SYSCTL_DECL
SYSCTL_DECL(_net_bpf);
#endif
/*
* Rotate the packet buffers in descriptor d. Move the store buffer into the
* hold slot, and the free buffer ino the store slot. Zero the length of the
* new store buffer. Descriptor lock should be held.
*/
#define ROTATE_BUFFERS(d) do { \
(d)->bd_hbuf = (d)->bd_sbuf; \
(d)->bd_hlen = (d)->bd_slen; \
(d)->bd_sbuf = (d)->bd_fbuf; \
(d)->bd_slen = 0; \
(d)->bd_fbuf = NULL; \
bpf_bufheld(d); \
} while (0)
/*
* Descriptor associated with each attached hardware interface.
* FIXME: this structure is exposed to external callers to speed up
* bpf_peers_present() call. However we cover all fields not needed by
* this function via BPF_INTERNAL define
*/
struct bpf_if {
LIST_ENTRY(bpf_if) bif_next; /* list of all interfaces */
LIST_HEAD(, bpf_d) bif_dlist; /* descriptor list */
#ifdef BPF_INTERNAL
u_int bif_dlt; /* link layer type */
u_int bif_hdrlen; /* length of link header */
struct ifnet *bif_ifp; /* corresponding interface */
struct rwlock bif_lock; /* interface lock */
LIST_HEAD(, bpf_d) bif_wlist; /* writer-only list */
#endif
};
void bpf_bufheld(struct bpf_d *d);
int bpf_validate(const struct bpf_insn *, int);
void bpf_tap(struct bpf_if *, u_char *, u_int);
void bpf_mtap(struct bpf_if *, struct mbuf *);
void bpf_mtap2(struct bpf_if *, void *, u_int, struct mbuf *);
void bpfattach(struct ifnet *, u_int, u_int);
void bpfattach2(struct ifnet *, u_int, u_int, struct bpf_if **);
void bpfdetach(struct ifnet *);
void bpfilterattach(int);
u_int bpf_filter(const struct bpf_insn *, u_char *, u_int, u_int);
static __inline int
bpf_peers_present(struct bpf_if *bpf)
{
if (!LIST_EMPTY(&bpf->bif_dlist))
return (1);
return (0);
}
#define BPF_TAP(_ifp,_pkt,_pktlen) do { \
if (bpf_peers_present((_ifp)->if_bpf)) \
bpf_tap((_ifp)->if_bpf, (_pkt), (_pktlen)); \
} while (0)
#define BPF_MTAP(_ifp,_m) do { \
if (bpf_peers_present((_ifp)->if_bpf)) { \
M_ASSERTVALID(_m); \
bpf_mtap((_ifp)->if_bpf, (_m)); \
} \
} while (0)
#define BPF_MTAP2(_ifp,_data,_dlen,_m) do { \
if (bpf_peers_present((_ifp)->if_bpf)) { \
M_ASSERTVALID(_m); \
bpf_mtap2((_ifp)->if_bpf,(_data),(_dlen),(_m)); \
} \
} while (0)
#endif
/*
* Number of scratch memory words (for BPF_LD|BPF_MEM and BPF_ST).
*/
#define BPF_MEMWORDS 16
#endif /* _NET_BPF_H_ */
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