1 | /* $NetBSD: bpfdesc.h,v 1.38 2013/11/15 00:12:44 rmind Exp $ */ |
2 | |
3 | /* |
4 | * Copyright (c) 1990, 1991, 1993 |
5 | * The Regents of the University of California. All rights reserved. |
6 | * |
7 | * This code is derived from the Stanford/CMU enet packet filter, |
8 | * (net/enet.c) distributed as part of 4.3BSD, and code contributed |
9 | * to Berkeley by Steven McCanne and Van Jacobson both of Lawrence |
10 | * Berkeley Laboratory. |
11 | * |
12 | * Redistribution and use in source and binary forms, with or without |
13 | * modification, are permitted provided that the following conditions |
14 | * are met: |
15 | * 1. Redistributions of source code must retain the above copyright |
16 | * notice, this list of conditions and the following disclaimer. |
17 | * 2. Redistributions in binary form must reproduce the above copyright |
18 | * notice, this list of conditions and the following disclaimer in the |
19 | * documentation and/or other materials provided with the distribution. |
20 | * 3. Neither the name of the University nor the names of its contributors |
21 | * may be used to endorse or promote products derived from this software |
22 | * without specific prior written permission. |
23 | * |
24 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
25 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
26 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
27 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
28 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
29 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
30 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
31 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
32 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
33 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
34 | * SUCH DAMAGE. |
35 | * |
36 | * @(#)bpfdesc.h 8.1 (Berkeley) 6/10/93 |
37 | * |
38 | * @(#) Header: bpfdesc.h,v 1.14 96/06/16 22:28:07 leres Exp (LBL) |
39 | */ |
40 | |
41 | #ifndef _NET_BPFDESC_H_ |
42 | #define _NET_BPFDESC_H_ |
43 | |
44 | #include <sys/callout.h> |
45 | #include <sys/selinfo.h> /* for struct selinfo */ |
46 | #include <net/if.h> /* for IFNAMSIZ */ |
47 | #include <net/bpfjit.h> /* for bpfjit_function_t */ |
48 | |
49 | /* |
50 | * Descriptor associated with each open bpf file. |
51 | */ |
52 | struct bpf_d { |
53 | struct bpf_d *bd_next; /* Linked list of descriptors */ |
54 | /* |
55 | * Buffer slots: two mbuf clusters buffer the incoming packets. |
56 | * The model has three slots. Sbuf is always occupied. |
57 | * sbuf (store) - Receive interrupt puts packets here. |
58 | * hbuf (hold) - When sbuf is full, put cluster here and |
59 | * wakeup read (replace sbuf with fbuf). |
60 | * fbuf (free) - When read is done, put cluster here. |
61 | * On receiving, if sbuf is full and fbuf is 0, packet is dropped. |
62 | */ |
63 | void * bd_sbuf; /* store slot */ |
64 | void * bd_hbuf; /* hold slot */ |
65 | void * bd_fbuf; /* free slot */ |
66 | int bd_slen; /* current length of store buffer */ |
67 | int bd_hlen; /* current length of hold buffer */ |
68 | |
69 | int bd_bufsize; /* absolute length of buffers */ |
70 | |
71 | struct bpf_if * bd_bif; /* interface descriptor */ |
72 | u_long bd_rtout; /* Read timeout in 'ticks' */ |
73 | struct bpf_insn *bd_filter; /* filter code */ |
74 | u_long bd_rcount; /* number of packets received */ |
75 | u_long bd_dcount; /* number of packets dropped */ |
76 | u_long bd_ccount; /* number of packets captured */ |
77 | |
78 | u_char bd_promisc; /* true if listening promiscuously */ |
79 | u_char bd_state; /* idle, waiting, or timed out */ |
80 | u_char bd_immediate; /* true to return on packet arrival */ |
81 | int bd_hdrcmplt; /* false to fill in src lladdr */ |
82 | int bd_seesent; /* true if bpf should see sent packets */ |
83 | int bd_feedback; /* true to feed back sent packets */ |
84 | int bd_async; /* non-zero if packet reception should generate signal */ |
85 | pid_t bd_pgid; /* process or group id for signal */ |
86 | #if BSD < 199103 |
87 | u_char bd_selcoll; /* true if selects collide */ |
88 | int bd_timedout; |
89 | struct proc * bd_selproc; /* process that last selected us */ |
90 | #else |
91 | u_char bd_pad; /* explicit alignment */ |
92 | struct selinfo bd_sel; /* bsd select info */ |
93 | #endif |
94 | callout_t bd_callout; /* for BPF timeouts with select */ |
95 | pid_t bd_pid; /* corresponding PID */ |
96 | LIST_ENTRY(bpf_d) bd_list; /* list of all BPF's */ |
97 | void *bd_sih; /* soft interrupt handle */ |
98 | struct timespec bd_atime; /* access time */ |
99 | struct timespec bd_mtime; /* modification time */ |
100 | struct timespec bd_btime; /* birth time */ |
101 | #ifdef _LP64 |
102 | int bd_compat32; /* 32-bit stream on LP64 system */ |
103 | #endif |
104 | bpfjit_func_t bd_jitcode; /* compiled filter program */ |
105 | }; |
106 | |
107 | |
108 | /* Values for bd_state */ |
109 | #define BPF_IDLE 0 /* no select in progress */ |
110 | #define BPF_WAITING 1 /* waiting for read timeout in select */ |
111 | #define BPF_TIMED_OUT 2 /* read timeout has expired in select */ |
112 | |
113 | /* |
114 | * Description associated with the external representation of each |
115 | * open bpf file. |
116 | */ |
117 | struct bpf_d_ext { |
118 | int32_t bde_bufsize; |
119 | uint8_t bde_promisc; |
120 | uint8_t bde_state; |
121 | uint8_t bde_immediate; |
122 | int32_t bde_hdrcmplt; |
123 | int32_t bde_seesent; |
124 | pid_t bde_pid; |
125 | uint64_t bde_rcount; /* number of packets received */ |
126 | uint64_t bde_dcount; /* number of packets dropped */ |
127 | uint64_t bde_ccount; /* number of packets captured */ |
128 | char bde_ifname[IFNAMSIZ]; |
129 | }; |
130 | |
131 | |
132 | /* |
133 | * Descriptor associated with each attached hardware interface. |
134 | */ |
135 | struct bpf_if { |
136 | struct bpf_if *bif_next; /* list of all interfaces */ |
137 | struct bpf_d *bif_dlist; /* descriptor list */ |
138 | struct bpf_if **bif_driverp; /* pointer into softc */ |
139 | u_int bif_dlt; /* link layer type */ |
140 | u_int bif_hdrlen; /* length of header (with padding) */ |
141 | struct ifnet *bif_ifp; /* corresponding interface */ |
142 | }; |
143 | |
144 | #ifdef _KERNEL |
145 | int bpf_setf(struct bpf_d *, struct bpf_program *); |
146 | #endif |
147 | |
148 | #endif /* !_NET_BPFDESC_H_ */ |
149 | |