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15f0127d RC |
1 | /* |
2 | * PTP 1588 support | |
3 | * | |
4 | * This file implements a BPF that recognizes PTP event messages. | |
5 | * | |
6 | * Copyright (C) 2010 OMICRON electronics GmbH | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License as published by | |
10 | * the Free Software Foundation; either version 2 of the License, or | |
11 | * (at your option) any later version. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License | |
19 | * along with this program; if not, write to the Free Software | |
20 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
21 | */ | |
22 | ||
23 | #ifndef _PTP_CLASSIFY_H_ | |
24 | #define _PTP_CLASSIFY_H_ | |
25 | ||
26 | #include <linux/if_ether.h> | |
27 | #include <linux/if_vlan.h> | |
28 | #include <linux/filter.h> | |
29 | #ifdef __KERNEL__ | |
30 | #include <linux/in.h> | |
31 | #else | |
32 | #include <netinet/in.h> | |
33 | #endif | |
34 | ||
35 | #define PTP_CLASS_NONE 0x00 /* not a PTP event message */ | |
36 | #define PTP_CLASS_V1 0x01 /* protocol version 1 */ | |
37 | #define PTP_CLASS_V2 0x02 /* protocol version 2 */ | |
38 | #define PTP_CLASS_VMASK 0x0f /* max protocol version is 15 */ | |
39 | #define PTP_CLASS_IPV4 0x10 /* event in an IPV4 UDP packet */ | |
40 | #define PTP_CLASS_IPV6 0x20 /* event in an IPV6 UDP packet */ | |
41 | #define PTP_CLASS_L2 0x30 /* event in a L2 packet */ | |
42 | #define PTP_CLASS_VLAN 0x40 /* event in a VLAN tagged L2 packet */ | |
43 | #define PTP_CLASS_PMASK 0xf0 /* mask for the packet type field */ | |
44 | ||
45 | #define PTP_CLASS_V1_IPV4 (PTP_CLASS_V1 | PTP_CLASS_IPV4) | |
46 | #define PTP_CLASS_V1_IPV6 (PTP_CLASS_V1 | PTP_CLASS_IPV6) /*probably DNE*/ | |
47 | #define PTP_CLASS_V2_IPV4 (PTP_CLASS_V2 | PTP_CLASS_IPV4) | |
48 | #define PTP_CLASS_V2_IPV6 (PTP_CLASS_V2 | PTP_CLASS_IPV6) | |
49 | #define PTP_CLASS_V2_L2 (PTP_CLASS_V2 | PTP_CLASS_L2) | |
50 | #define PTP_CLASS_V2_VLAN (PTP_CLASS_V2 | PTP_CLASS_VLAN) | |
51 | ||
52 | #define PTP_EV_PORT 319 | |
53 | ||
54 | #define OFF_ETYPE 12 | |
55 | #define OFF_IHL 14 | |
56 | #define OFF_FRAG 20 | |
57 | #define OFF_PROTO4 23 | |
58 | #define OFF_NEXT 6 | |
59 | #define OFF_UDP_DST 2 | |
60 | ||
61 | #define IP6_HLEN 40 | |
62 | #define UDP_HLEN 8 | |
63 | ||
64 | #define RELOFF_DST4 (ETH_HLEN + OFF_UDP_DST) | |
65 | #define OFF_DST6 (ETH_HLEN + IP6_HLEN + OFF_UDP_DST) | |
66 | #define OFF_PTP6 (ETH_HLEN + IP6_HLEN + UDP_HLEN) | |
67 | ||
68 | #define OP_AND (BPF_ALU | BPF_AND | BPF_K) | |
69 | #define OP_JEQ (BPF_JMP | BPF_JEQ | BPF_K) | |
70 | #define OP_JSET (BPF_JMP | BPF_JSET | BPF_K) | |
71 | #define OP_LDB (BPF_LD | BPF_B | BPF_ABS) | |
72 | #define OP_LDH (BPF_LD | BPF_H | BPF_ABS) | |
73 | #define OP_LDHI (BPF_LD | BPF_H | BPF_IND) | |
74 | #define OP_LDX (BPF_LDX | BPF_B | BPF_MSH) | |
75 | #define OP_OR (BPF_ALU | BPF_OR | BPF_K) | |
76 | #define OP_RETA (BPF_RET | BPF_A) | |
77 | #define OP_RETK (BPF_RET | BPF_K) | |
78 | ||
79 | static inline int ptp_filter_init(struct sock_filter *f, int len) | |
80 | { | |
81 | if (OP_LDH == f[0].code) | |
82 | return sk_chk_filter(f, len); | |
83 | else | |
84 | return 0; | |
85 | } | |
86 | ||
87 | #define PTP_FILTER \ | |
88 | {OP_LDH, 0, 0, OFF_ETYPE }, /* */ \ | |
89 | {OP_JEQ, 0, 12, ETH_P_IP }, /* f goto L20 */ \ | |
90 | {OP_LDB, 0, 0, OFF_PROTO4 }, /* */ \ | |
91 | {OP_JEQ, 0, 9, IPPROTO_UDP }, /* f goto L10 */ \ | |
92 | {OP_LDH, 0, 0, OFF_FRAG }, /* */ \ | |
93 | {OP_JSET, 7, 0, 0x1fff }, /* t goto L11 */ \ | |
94 | {OP_LDX, 0, 0, OFF_IHL }, /* */ \ | |
95 | {OP_LDHI, 0, 0, RELOFF_DST4 }, /* */ \ | |
96 | {OP_JEQ, 0, 4, PTP_EV_PORT }, /* f goto L12 */ \ | |
97 | {OP_LDHI, 0, 0, ETH_HLEN + UDP_HLEN }, /* */ \ | |
98 | {OP_AND, 0, 0, PTP_CLASS_VMASK }, /* */ \ | |
99 | {OP_OR, 0, 0, PTP_CLASS_IPV4 }, /* */ \ | |
100 | {OP_RETA, 0, 0, 0 }, /* */ \ | |
101 | /*L1x*/ {OP_RETK, 0, 0, PTP_CLASS_NONE }, /* */ \ | |
102 | /*L20*/ {OP_JEQ, 0, 9, ETH_P_IPV6 }, /* f goto L40 */ \ | |
103 | {OP_LDB, 0, 0, ETH_HLEN + OFF_NEXT }, /* */ \ | |
104 | {OP_JEQ, 0, 6, IPPROTO_UDP }, /* f goto L30 */ \ | |
105 | {OP_LDH, 0, 0, OFF_DST6 }, /* */ \ | |
106 | {OP_JEQ, 0, 4, PTP_EV_PORT }, /* f goto L31 */ \ | |
107 | {OP_LDH, 0, 0, OFF_PTP6 }, /* */ \ | |
108 | {OP_AND, 0, 0, PTP_CLASS_VMASK }, /* */ \ | |
109 | {OP_OR, 0, 0, PTP_CLASS_IPV6 }, /* */ \ | |
110 | {OP_RETA, 0, 0, 0 }, /* */ \ | |
111 | /*L3x*/ {OP_RETK, 0, 0, PTP_CLASS_NONE }, /* */ \ | |
112 | /*L40*/ {OP_JEQ, 0, 6, ETH_P_8021Q }, /* f goto L50 */ \ | |
113 | {OP_LDH, 0, 0, OFF_ETYPE + 4 }, /* */ \ | |
114 | {OP_JEQ, 0, 9, ETH_P_1588 }, /* f goto L60 */ \ | |
115 | {OP_LDH, 0, 0, ETH_HLEN + VLAN_HLEN }, /* */ \ | |
116 | {OP_AND, 0, 0, PTP_CLASS_VMASK }, /* */ \ | |
117 | {OP_OR, 0, 0, PTP_CLASS_VLAN }, /* */ \ | |
118 | {OP_RETA, 0, 0, 0 }, /* */ \ | |
119 | /*L50*/ {OP_JEQ, 0, 4, ETH_P_1588 }, /* f goto L61 */ \ | |
120 | {OP_LDH, 0, 0, ETH_HLEN }, /* */ \ | |
121 | {OP_AND, 0, 0, PTP_CLASS_VMASK }, /* */ \ | |
122 | {OP_OR, 0, 0, PTP_CLASS_L2 }, /* */ \ | |
123 | {OP_RETA, 0, 0, 0 }, /* */ \ | |
124 | /*L6x*/ {OP_RETK, 0, 0, PTP_CLASS_NONE }, | |
125 | ||
126 | #endif |