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The sk_unattached_filter_create() API is used by BPF filters that are not directly attached or related to sockets, and are used in team, ptp, xt_bpf, cls_bpf, etc. As such all users do their own internal managment of obtaining filter blocks and thus already have them in kernel memory and set up before calling into sk_unattached_filter_create(). As a result, due to __user annotation in sock_fprog, sparse triggers false positives (incorrect type in assignment [different address space]) when filters are set up before passing them to sk_unattached_filter_create(). Therefore, let sk_unattached_filter_create() API use sock_fprog_kern to overcome this issue. Signed-off-by: Daniel Borkmann <dborkman@redhat.com> Acked-by: Alexei Starovoitov <ast@plumgrid.com> Signed-off-by: David S. Miller <davem@davemloft.net>
142 lines
5.1 KiB
C
142 lines
5.1 KiB
C
/* PTP classifier
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of version 2 of the GNU General Public
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* License as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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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, drop_ieee1588 ; 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 #0x40 ; PTP_CLASS_V2_VLAN
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* ret a ; return PTP class
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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 #0x30 ; 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 sk_filter *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 SK_RUN_FILTER(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, 9, 0x00008100 },
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{ 0x28, 0, 0, 0x00000010 },
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{ 0x15, 0, 15, 0x000088f7 },
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{ 0x30, 0, 0, 0x00000012 },
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{ 0x54, 0, 0, 0x00000008 },
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{ 0x15, 0, 12, 0x00000000 },
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{ 0x28, 0, 0, 0x00000012 },
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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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{ 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, 0x00000030 },
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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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.len = ARRAY_SIZE(ptp_filter), .filter = ptp_filter,
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};
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BUG_ON(sk_unattached_filter_create(&ptp_insns, &ptp_prog));
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}
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