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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 | // SPDX-License-Identifier: GPL-2.0-only /* PTP classifier */ /* The below program is the bpf_asm (tools/net/) representation of * the opcode array in the ptp_filter structure. * * For convenience, this can easily be altered and reviewed with * bpf_asm and bpf_dbg, e.g. `./bpf_asm -c prog` where prog is a * simple file containing the below program: * * ldh [12] ; load ethertype * * ; PTP over UDP over IPv4 over Ethernet * test_ipv4: * jneq #0x800, test_ipv6 ; ETH_P_IP ? * ldb [23] ; load proto * jneq #17, drop_ipv4 ; IPPROTO_UDP ? * ldh [20] ; load frag offset field * jset #0x1fff, drop_ipv4 ; don't allow fragments * ldxb 4*([14]&0xf) ; load IP header len * ldh [x + 16] ; load UDP dst port * jneq #319, drop_ipv4 ; is port PTP_EV_PORT ? * ldh [x + 22] ; load payload * and #0xf ; mask PTP_CLASS_VMASK * or #0x10 ; PTP_CLASS_IPV4 * ret a ; return PTP class * drop_ipv4: ret #0x0 ; PTP_CLASS_NONE * * ; PTP over UDP over IPv6 over Ethernet * test_ipv6: * jneq #0x86dd, test_8021q ; ETH_P_IPV6 ? * ldb [20] ; load proto * jneq #17, drop_ipv6 ; IPPROTO_UDP ? * ldh [56] ; load UDP dst port * jneq #319, drop_ipv6 ; is port PTP_EV_PORT ? * ldh [62] ; load payload * and #0xf ; mask PTP_CLASS_VMASK * or #0x20 ; PTP_CLASS_IPV6 * ret a ; return PTP class * drop_ipv6: ret #0x0 ; PTP_CLASS_NONE * * ; PTP over 802.1Q over Ethernet * test_8021q: * jneq #0x8100, test_ieee1588 ; ETH_P_8021Q ? * ldh [16] ; load inner type * jneq #0x88f7, test_8021q_ipv4 ; ETH_P_1588 ? * ldb [18] ; load payload * and #0x8 ; as we don't have ports here, test * jneq #0x0, drop_ieee1588 ; for PTP_GEN_BIT and drop these * ldh [18] ; reload payload * and #0xf ; mask PTP_CLASS_VMASK * or #0xc0 ; PTP_CLASS_VLAN|PTP_CLASS_L2 * ret a ; return PTP class * * ; PTP over UDP over IPv4 over 802.1Q over Ethernet * test_8021q_ipv4: * jneq #0x800, test_8021q_ipv6 ; ETH_P_IP ? * ldb [27] ; load proto * jneq #17, drop_8021q_ipv4 ; IPPROTO_UDP ? * ldh [24] ; load frag offset field * jset #0x1fff, drop_8021q_ipv4; don't allow fragments * ldxb 4*([18]&0xf) ; load IP header len * ldh [x + 20] ; load UDP dst port * jneq #319, drop_8021q_ipv4 ; is port PTP_EV_PORT ? * ldh [x + 26] ; load payload * and #0xf ; mask PTP_CLASS_VMASK * or #0x90 ; PTP_CLASS_VLAN|PTP_CLASS_IPV4 * ret a ; return PTP class * drop_8021q_ipv4: ret #0x0 ; PTP_CLASS_NONE * * ; PTP over UDP over IPv6 over 802.1Q over Ethernet * test_8021q_ipv6: * jneq #0x86dd, drop_8021q_ipv6 ; ETH_P_IPV6 ? * ldb [24] ; load proto * jneq #17, drop_8021q_ipv6 ; IPPROTO_UDP ? * ldh [60] ; load UDP dst port * jneq #319, drop_8021q_ipv6 ; is port PTP_EV_PORT ? * ldh [66] ; load payload * and #0xf ; mask PTP_CLASS_VMASK * or #0xa0 ; PTP_CLASS_VLAN|PTP_CLASS_IPV6 * ret a ; return PTP class * drop_8021q_ipv6: ret #0x0 ; PTP_CLASS_NONE * * ; PTP over Ethernet * test_ieee1588: * jneq #0x88f7, drop_ieee1588 ; ETH_P_1588 ? * ldb [14] ; load payload * and #0x8 ; as we don't have ports here, test * jneq #0x0, drop_ieee1588 ; for PTP_GEN_BIT and drop these * ldh [14] ; reload payload * and #0xf ; mask PTP_CLASS_VMASK * or #0x40 ; PTP_CLASS_L2 * ret a ; return PTP class * drop_ieee1588: ret #0x0 ; PTP_CLASS_NONE */ #include <linux/skbuff.h> #include <linux/filter.h> #include <linux/ptp_classify.h> static struct bpf_prog *ptp_insns __read_mostly; unsigned int ptp_classify_raw(const struct sk_buff *skb) { return bpf_prog_run(ptp_insns, skb); } EXPORT_SYMBOL_GPL(ptp_classify_raw); struct ptp_header *ptp_parse_header(struct sk_buff *skb, unsigned int type) { u8 *ptr = skb_mac_header(skb); if (type & PTP_CLASS_VLAN) ptr += VLAN_HLEN; switch (type & PTP_CLASS_PMASK) { case PTP_CLASS_IPV4: ptr += IPV4_HLEN(ptr) + UDP_HLEN; break; case PTP_CLASS_IPV6: ptr += IP6_HLEN + UDP_HLEN; break; case PTP_CLASS_L2: break; default: return NULL; } ptr += ETH_HLEN; /* Ensure that the entire header is present in this packet. */ if (ptr + sizeof(struct ptp_header) > skb->data + skb->len) return NULL; return (struct ptp_header *)ptr; } EXPORT_SYMBOL_GPL(ptp_parse_header); bool ptp_msg_is_sync(struct sk_buff *skb, unsigned int type) { struct ptp_header *hdr; hdr = ptp_parse_header(skb, type); if (!hdr) return false; return ptp_get_msgtype(hdr, type) == PTP_MSGTYPE_SYNC; } EXPORT_SYMBOL_GPL(ptp_msg_is_sync); void __init ptp_classifier_init(void) { static struct sock_filter ptp_filter[] __initdata = { { 0x28, 0, 0, 0x0000000c }, { 0x15, 0, 12, 0x00000800 }, { 0x30, 0, 0, 0x00000017 }, { 0x15, 0, 9, 0x00000011 }, { 0x28, 0, 0, 0x00000014 }, { 0x45, 7, 0, 0x00001fff }, { 0xb1, 0, 0, 0x0000000e }, { 0x48, 0, 0, 0x00000010 }, { 0x15, 0, 4, 0x0000013f }, { 0x48, 0, 0, 0x00000016 }, { 0x54, 0, 0, 0x0000000f }, { 0x44, 0, 0, 0x00000010 }, { 0x16, 0, 0, 0x00000000 }, { 0x06, 0, 0, 0x00000000 }, { 0x15, 0, 9, 0x000086dd }, { 0x30, 0, 0, 0x00000014 }, { 0x15, 0, 6, 0x00000011 }, { 0x28, 0, 0, 0x00000038 }, { 0x15, 0, 4, 0x0000013f }, { 0x28, 0, 0, 0x0000003e }, { 0x54, 0, 0, 0x0000000f }, { 0x44, 0, 0, 0x00000020 }, { 0x16, 0, 0, 0x00000000 }, { 0x06, 0, 0, 0x00000000 }, { 0x15, 0, 32, 0x00008100 }, { 0x28, 0, 0, 0x00000010 }, { 0x15, 0, 7, 0x000088f7 }, { 0x30, 0, 0, 0x00000012 }, { 0x54, 0, 0, 0x00000008 }, { 0x15, 0, 35, 0x00000000 }, { 0x28, 0, 0, 0x00000012 }, { 0x54, 0, 0, 0x0000000f }, { 0x44, 0, 0, 0x000000c0 }, { 0x16, 0, 0, 0x00000000 }, { 0x15, 0, 12, 0x00000800 }, { 0x30, 0, 0, 0x0000001b }, { 0x15, 0, 9, 0x00000011 }, { 0x28, 0, 0, 0x00000018 }, { 0x45, 7, 0, 0x00001fff }, { 0xb1, 0, 0, 0x00000012 }, { 0x48, 0, 0, 0x00000014 }, { 0x15, 0, 4, 0x0000013f }, { 0x48, 0, 0, 0x0000001a }, { 0x54, 0, 0, 0x0000000f }, { 0x44, 0, 0, 0x00000090 }, { 0x16, 0, 0, 0x00000000 }, { 0x06, 0, 0, 0x00000000 }, { 0x15, 0, 8, 0x000086dd }, { 0x30, 0, 0, 0x00000018 }, { 0x15, 0, 6, 0x00000011 }, { 0x28, 0, 0, 0x0000003c }, { 0x15, 0, 4, 0x0000013f }, { 0x28, 0, 0, 0x00000042 }, { 0x54, 0, 0, 0x0000000f }, { 0x44, 0, 0, 0x000000a0 }, { 0x16, 0, 0, 0x00000000 }, { 0x06, 0, 0, 0x00000000 }, { 0x15, 0, 7, 0x000088f7 }, { 0x30, 0, 0, 0x0000000e }, { 0x54, 0, 0, 0x00000008 }, { 0x15, 0, 4, 0x00000000 }, { 0x28, 0, 0, 0x0000000e }, { 0x54, 0, 0, 0x0000000f }, { 0x44, 0, 0, 0x00000040 }, { 0x16, 0, 0, 0x00000000 }, { 0x06, 0, 0, 0x00000000 }, }; struct sock_fprog_kern ptp_prog; ptp_prog.len = ARRAY_SIZE(ptp_filter); ptp_prog.filter = ptp_filter; BUG_ON(bpf_prog_create(&ptp_insns, &ptp_prog)); } |