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Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of version 2 of the gnu general public license as published by the free software foundation this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 64 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Alexios Zavras <alexios.zavras@intel.com> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190529141901.894819585@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
187 lines
6.8 KiB
C
187 lines
6.8 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/* PTP classifier
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*/
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/* The below program is the bpf_asm (tools/net/) representation of
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* the opcode array in the ptp_filter structure.
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*
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* For convenience, this can easily be altered and reviewed with
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* bpf_asm and bpf_dbg, e.g. `./bpf_asm -c prog` where prog is a
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* simple file containing the below program:
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*
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* ldh [12] ; load ethertype
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*
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* ; PTP over UDP over IPv4 over Ethernet
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* test_ipv4:
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* jneq #0x800, test_ipv6 ; ETH_P_IP ?
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* ldb [23] ; load proto
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* jneq #17, drop_ipv4 ; IPPROTO_UDP ?
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* ldh [20] ; load frag offset field
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* jset #0x1fff, drop_ipv4 ; don't allow fragments
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* ldxb 4*([14]&0xf) ; load IP header len
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* ldh [x + 16] ; load UDP dst port
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* jneq #319, drop_ipv4 ; is port PTP_EV_PORT ?
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* ldh [x + 22] ; load payload
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* and #0xf ; mask PTP_CLASS_VMASK
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* or #0x10 ; PTP_CLASS_IPV4
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* ret a ; return PTP class
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* drop_ipv4: ret #0x0 ; PTP_CLASS_NONE
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*
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* ; PTP over UDP over IPv6 over Ethernet
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* test_ipv6:
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* jneq #0x86dd, test_8021q ; ETH_P_IPV6 ?
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* ldb [20] ; load proto
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* jneq #17, drop_ipv6 ; IPPROTO_UDP ?
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* ldh [56] ; load UDP dst port
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* jneq #319, drop_ipv6 ; is port PTP_EV_PORT ?
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* ldh [62] ; load payload
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* and #0xf ; mask PTP_CLASS_VMASK
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* or #0x20 ; PTP_CLASS_IPV6
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* ret a ; return PTP class
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* drop_ipv6: ret #0x0 ; PTP_CLASS_NONE
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*
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* ; PTP over 802.1Q over Ethernet
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* test_8021q:
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* jneq #0x8100, test_ieee1588 ; ETH_P_8021Q ?
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* ldh [16] ; load inner type
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* jneq #0x88f7, test_8021q_ipv4 ; ETH_P_1588 ?
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* ldb [18] ; load payload
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* and #0x8 ; as we don't have ports here, test
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* jneq #0x0, drop_ieee1588 ; for PTP_GEN_BIT and drop these
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* ldh [18] ; reload payload
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* and #0xf ; mask PTP_CLASS_VMASK
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* or #0xc0 ; PTP_CLASS_VLAN|PTP_CLASS_L2
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* ret a ; return PTP class
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*
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* ; PTP over UDP over IPv4 over 802.1Q over Ethernet
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* test_8021q_ipv4:
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* jneq #0x800, test_8021q_ipv6 ; ETH_P_IP ?
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* ldb [27] ; load proto
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* jneq #17, drop_8021q_ipv4 ; IPPROTO_UDP ?
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* ldh [24] ; load frag offset field
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* jset #0x1fff, drop_8021q_ipv4; don't allow fragments
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* ldxb 4*([18]&0xf) ; load IP header len
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* ldh [x + 20] ; load UDP dst port
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* jneq #319, drop_8021q_ipv4 ; is port PTP_EV_PORT ?
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* ldh [x + 26] ; load payload
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* and #0xf ; mask PTP_CLASS_VMASK
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* or #0x90 ; PTP_CLASS_VLAN|PTP_CLASS_IPV4
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* ret a ; return PTP class
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* drop_8021q_ipv4: ret #0x0 ; PTP_CLASS_NONE
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*
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* ; PTP over UDP over IPv6 over 802.1Q over Ethernet
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* test_8021q_ipv6:
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* jneq #0x86dd, drop_8021q_ipv6 ; ETH_P_IPV6 ?
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* ldb [24] ; load proto
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* jneq #17, drop_8021q_ipv6 ; IPPROTO_UDP ?
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* ldh [60] ; load UDP dst port
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* jneq #319, drop_8021q_ipv6 ; is port PTP_EV_PORT ?
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* ldh [66] ; load payload
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* and #0xf ; mask PTP_CLASS_VMASK
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* or #0xa0 ; PTP_CLASS_VLAN|PTP_CLASS_IPV6
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* ret a ; return PTP class
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* drop_8021q_ipv6: ret #0x0 ; PTP_CLASS_NONE
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*
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* ; PTP over Ethernet
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* test_ieee1588:
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* jneq #0x88f7, drop_ieee1588 ; ETH_P_1588 ?
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* ldb [14] ; load payload
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* and #0x8 ; as we don't have ports here, test
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* jneq #0x0, drop_ieee1588 ; for PTP_GEN_BIT and drop these
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* ldh [14] ; reload payload
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* and #0xf ; mask PTP_CLASS_VMASK
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* or #0x40 ; PTP_CLASS_L2
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* ret a ; return PTP class
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* drop_ieee1588: ret #0x0 ; PTP_CLASS_NONE
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*/
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#include <linux/skbuff.h>
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#include <linux/filter.h>
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#include <linux/ptp_classify.h>
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static struct bpf_prog *ptp_insns __read_mostly;
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unsigned int ptp_classify_raw(const struct sk_buff *skb)
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{
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return BPF_PROG_RUN(ptp_insns, skb);
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}
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EXPORT_SYMBOL_GPL(ptp_classify_raw);
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void __init ptp_classifier_init(void)
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{
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static struct sock_filter ptp_filter[] __initdata = {
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{ 0x28, 0, 0, 0x0000000c },
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{ 0x15, 0, 12, 0x00000800 },
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{ 0x30, 0, 0, 0x00000017 },
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{ 0x15, 0, 9, 0x00000011 },
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{ 0x28, 0, 0, 0x00000014 },
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{ 0x45, 7, 0, 0x00001fff },
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{ 0xb1, 0, 0, 0x0000000e },
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{ 0x48, 0, 0, 0x00000010 },
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{ 0x15, 0, 4, 0x0000013f },
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{ 0x48, 0, 0, 0x00000016 },
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{ 0x54, 0, 0, 0x0000000f },
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{ 0x44, 0, 0, 0x00000010 },
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{ 0x16, 0, 0, 0x00000000 },
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{ 0x06, 0, 0, 0x00000000 },
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{ 0x15, 0, 9, 0x000086dd },
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{ 0x30, 0, 0, 0x00000014 },
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{ 0x15, 0, 6, 0x00000011 },
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{ 0x28, 0, 0, 0x00000038 },
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{ 0x15, 0, 4, 0x0000013f },
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{ 0x28, 0, 0, 0x0000003e },
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{ 0x54, 0, 0, 0x0000000f },
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{ 0x44, 0, 0, 0x00000020 },
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{ 0x16, 0, 0, 0x00000000 },
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{ 0x06, 0, 0, 0x00000000 },
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{ 0x15, 0, 32, 0x00008100 },
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{ 0x28, 0, 0, 0x00000010 },
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{ 0x15, 0, 7, 0x000088f7 },
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{ 0x30, 0, 0, 0x00000012 },
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{ 0x54, 0, 0, 0x00000008 },
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{ 0x15, 0, 35, 0x00000000 },
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{ 0x28, 0, 0, 0x00000012 },
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{ 0x54, 0, 0, 0x0000000f },
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{ 0x44, 0, 0, 0x000000c0 },
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{ 0x16, 0, 0, 0x00000000 },
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{ 0x15, 0, 12, 0x00000800 },
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{ 0x30, 0, 0, 0x0000001b },
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{ 0x15, 0, 9, 0x00000011 },
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{ 0x28, 0, 0, 0x00000018 },
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{ 0x45, 7, 0, 0x00001fff },
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{ 0xb1, 0, 0, 0x00000012 },
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{ 0x48, 0, 0, 0x00000014 },
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{ 0x15, 0, 4, 0x0000013f },
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{ 0x48, 0, 0, 0x0000001a },
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{ 0x54, 0, 0, 0x0000000f },
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{ 0x44, 0, 0, 0x00000090 },
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{ 0x16, 0, 0, 0x00000000 },
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{ 0x06, 0, 0, 0x00000000 },
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{ 0x15, 0, 8, 0x000086dd },
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{ 0x30, 0, 0, 0x00000018 },
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{ 0x15, 0, 6, 0x00000011 },
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{ 0x28, 0, 0, 0x0000003c },
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{ 0x15, 0, 4, 0x0000013f },
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{ 0x28, 0, 0, 0x00000042 },
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{ 0x54, 0, 0, 0x0000000f },
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{ 0x44, 0, 0, 0x000000a0 },
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{ 0x16, 0, 0, 0x00000000 },
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{ 0x06, 0, 0, 0x00000000 },
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{ 0x15, 0, 7, 0x000088f7 },
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{ 0x30, 0, 0, 0x0000000e },
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{ 0x54, 0, 0, 0x00000008 },
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{ 0x15, 0, 4, 0x00000000 },
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{ 0x28, 0, 0, 0x0000000e },
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{ 0x54, 0, 0, 0x0000000f },
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{ 0x44, 0, 0, 0x00000040 },
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{ 0x16, 0, 0, 0x00000000 },
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{ 0x06, 0, 0, 0x00000000 },
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};
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struct sock_fprog_kern ptp_prog;
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ptp_prog.len = ARRAY_SIZE(ptp_filter);
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ptp_prog.filter = ptp_filter;
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BUG_ON(bpf_prog_create(&ptp_insns, &ptp_prog));
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}
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