developer | e5e687d | 2023-08-08 16:05:33 +0800 | [diff] [blame^] | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
| 2 | /* |
| 3 | * Copyright (c) 2023 MediaTek Inc. All Rights Reserved. |
| 4 | * |
| 5 | * Author: Frank-zj Lin <rank-zj.lin@mediatek.com> |
| 6 | * Ren-Ting Wang <ren-ting.wang@mediatek.com> |
| 7 | */ |
| 8 | |
| 9 | #include <linux/if_ether.h> |
| 10 | #include <linux/netdevice.h> |
| 11 | #include <linux/ppp_defs.h> |
| 12 | #include <linux/udp.h> |
| 13 | |
| 14 | #include <pce/cls.h> |
| 15 | #include <pce/pce.h> |
| 16 | |
| 17 | #include "protocol/l2tp/l2tp.h" |
| 18 | #include "protocol/ppp/ppp.h" |
| 19 | #include "tunnel.h" |
| 20 | |
| 21 | static struct cls_entry udp_l2tp_data_cls_entry = { |
| 22 | .entry = CLS_ENTRY_UDP_L2TP_DATA, |
| 23 | .cdesc = { |
| 24 | .fport = 0x3, |
| 25 | .tport_idx = 0x4, |
| 26 | .tag_m = 0x3, |
| 27 | .tag = 0x2, |
| 28 | .dip_match_m = 0x1, |
| 29 | .dip_match = 0x1, |
| 30 | .l4_type_m = 0xFF, |
| 31 | .l4_type = 0x11, |
| 32 | .l4_valid_m = 0x7, |
| 33 | .l4_valid = 0x7, |
| 34 | .l4_dport_m = 0xFFFF, |
| 35 | .l4_dport = 1701, |
| 36 | .l4_hdr_usr_data_m = 0x80030000, |
| 37 | .l4_hdr_usr_data = 0x00020000, |
| 38 | }, |
| 39 | }; |
| 40 | |
| 41 | static inline bool l2tpv2_offload_match(struct udp_l2tp_data_hdr *l2tp) |
| 42 | { |
| 43 | u16 hdrflags = ntohs(l2tp->flag_ver); |
| 44 | |
| 45 | return ((hdrflags & L2TP_HDR_VER_MASK) == L2TP_HDR_VER_2 && |
| 46 | !(hdrflags & L2TP_HDRFLAG_T)); |
| 47 | } |
| 48 | |
| 49 | static inline bool ppp_offload_match(struct ppp_hdr *ppp) |
| 50 | { |
| 51 | return (ppp->addr == PPP_ALLSTATIONS && |
| 52 | ppp->ctrl == PPP_UI && ntohs(ppp->proto) == PPP_IP); |
| 53 | } |
| 54 | |
| 55 | static int udp_l2tp_data_tnl_decap_param_setup(struct sk_buff *skb, |
| 56 | struct tops_tnl_params *tnl_params) |
| 57 | { |
| 58 | struct udp_l2tp_data_hdr *l2tp; |
| 59 | struct udp_l2tp_data_hdr l2tph; |
| 60 | struct ppp_hdr *ppp; |
| 61 | struct ppp_hdr ppph; |
| 62 | struct udphdr *udp; |
| 63 | struct udphdr udph; |
| 64 | struct ethhdr *eth; |
| 65 | struct ethhdr ethh; |
| 66 | struct iphdr *ip; |
| 67 | struct iphdr iph; |
| 68 | int ret = 0; |
| 69 | |
| 70 | /* ppp */ |
| 71 | skb_push(skb, sizeof(struct ppp_hdr)); |
| 72 | ppp = skb_header_pointer(skb, 0, sizeof(struct ppp_hdr), &ppph); |
| 73 | |
| 74 | if (unlikely(!ppp)) { |
| 75 | ret = -EINVAL; |
| 76 | goto restore_ppp; |
| 77 | } |
| 78 | |
| 79 | if (unlikely(!ppp_offload_match(ppp))) { |
| 80 | pr_notice("ppp offload unmatched\n"); |
| 81 | ret = -EINVAL; |
| 82 | goto restore_ppp; |
| 83 | } |
| 84 | |
| 85 | /* l2tp */ |
| 86 | skb_push(skb, sizeof(struct udp_l2tp_data_hdr)); |
| 87 | l2tp = skb_header_pointer(skb, 0, sizeof(struct udp_l2tp_data_hdr), &l2tph); |
| 88 | if (unlikely(!l2tp)) { |
| 89 | ret = -EINVAL; |
| 90 | goto restore_l2tp; |
| 91 | } |
| 92 | |
| 93 | if (unlikely(!l2tpv2_offload_match(l2tp))) { |
| 94 | ret = -EINVAL; |
| 95 | goto restore_l2tp; |
| 96 | } |
| 97 | |
| 98 | tnl_params->priv.l2tp.tid = l2tp->tid; |
| 99 | tnl_params->priv.l2tp.sid = l2tp->sid; |
| 100 | |
| 101 | /* udp */ |
| 102 | skb_push(skb, sizeof(struct udphdr)); |
| 103 | udp = skb_header_pointer(skb, 0, sizeof(struct udphdr), &udph); |
| 104 | if (unlikely(!udp)) { |
| 105 | ret = -EINVAL; |
| 106 | goto restore_udp; |
| 107 | } |
| 108 | |
| 109 | if (unlikely(ntohs(udp->dest) != UDP_L2TP_PORT)) { |
| 110 | pr_notice("udp port 0x%x unmatched\n", ntohs(udp->dest)); |
| 111 | ret = -EINVAL; |
| 112 | goto restore_udp; |
| 113 | } |
| 114 | |
| 115 | tnl_params->sport = udp->dest; |
| 116 | tnl_params->dport = udp->source; |
| 117 | |
| 118 | /* ip */ |
| 119 | skb_push(skb, sizeof(struct iphdr)); |
| 120 | ip = skb_header_pointer(skb, 0, sizeof(struct iphdr), &iph); |
| 121 | if (unlikely(!ip)) { |
| 122 | ret = -EINVAL; |
| 123 | goto restore_ip; |
| 124 | } |
| 125 | |
| 126 | if (unlikely(ip->version != IPVERSION || ip->protocol != IPPROTO_UDP)) { |
| 127 | pr_notice("ip: %p version or protocol unmatched, ver: 0x%x, proto: 0x%x\n", |
| 128 | ip, ip->version, ip->protocol); |
| 129 | ret = -EINVAL; |
| 130 | goto restore_ip; |
| 131 | } |
| 132 | |
| 133 | tnl_params->protocol = ip->protocol; |
| 134 | tnl_params->sip = ip->daddr; |
| 135 | tnl_params->dip = ip->saddr; |
| 136 | |
| 137 | /* eth */ |
| 138 | skb_push(skb, sizeof(struct ethhdr)); |
| 139 | eth = skb_header_pointer(skb, 0, sizeof(struct ethhdr), ðh); |
| 140 | if (unlikely(!eth)) { |
| 141 | ret = -EINVAL; |
| 142 | goto restore_eth; |
| 143 | } |
| 144 | |
| 145 | if (unlikely(ntohs(eth->h_proto) != ETH_P_IP)) { |
| 146 | pr_notice("eth proto not supported, proto: 0x%x\n", |
| 147 | ntohs(eth->h_proto)); |
| 148 | ret = -EINVAL; |
| 149 | goto restore_eth; |
| 150 | } |
| 151 | |
| 152 | memcpy(&tnl_params->saddr, eth->h_dest, sizeof(u8) * ETH_ALEN); |
| 153 | memcpy(&tnl_params->daddr, eth->h_source, sizeof(u8) * ETH_ALEN); |
| 154 | |
| 155 | restore_eth: |
| 156 | skb_pull(skb, sizeof(struct ethhdr)); |
| 157 | restore_ip: |
| 158 | skb_pull(skb, sizeof(struct iphdr)); |
| 159 | restore_udp: |
| 160 | skb_pull(skb, sizeof(struct udphdr)); |
| 161 | restore_l2tp: |
| 162 | skb_pull(skb, sizeof(struct udp_l2tp_data_hdr)); |
| 163 | restore_ppp: |
| 164 | skb_pull(skb, sizeof(struct ppp_hdr)); |
| 165 | |
| 166 | return ret; |
| 167 | } |
| 168 | |
| 169 | static int udp_l2tp_data_tnl_encap_param_setup(struct sk_buff *skb, |
| 170 | struct tops_tnl_params *tnl_params) |
| 171 | { |
| 172 | struct ethhdr *eth = eth_hdr(skb); |
| 173 | struct iphdr *ip = ip_hdr(skb); |
| 174 | struct udp_l2tp_data_hdr *l2tp; |
| 175 | struct udp_l2tp_data_hdr l2tph; |
| 176 | struct udphdr *udp; |
| 177 | struct udphdr udph; |
| 178 | int ret = 0; |
| 179 | |
| 180 | if (unlikely(ip->version != IPVERSION || ip->protocol != IPPROTO_UDP)) { |
| 181 | pr_notice("eth proto: 0x%x, ip ver: 0x%x, proto: 0x%x is not support\n", |
| 182 | ntohs(eth->h_proto), |
| 183 | ip->version, |
| 184 | ip->protocol); |
| 185 | ret = -EINVAL; |
| 186 | goto out; |
| 187 | } |
| 188 | |
| 189 | skb_pull(skb, sizeof(struct iphdr)); |
| 190 | udp = skb_header_pointer(skb, 0, sizeof(struct udphdr), &udph); |
| 191 | if (unlikely(!udp)) { |
| 192 | ret = -EINVAL; |
| 193 | goto restore_ip; |
| 194 | } |
| 195 | |
| 196 | if (unlikely(ntohs(udp->dest) != UDP_L2TP_PORT)) { |
| 197 | pr_notice("udp port 0x%x unmatched\n", ntohs(udp->dest)); |
| 198 | ret = -EINVAL; |
| 199 | goto restore_ip; |
| 200 | } |
| 201 | |
| 202 | skb_pull(skb, sizeof(struct udphdr)); |
| 203 | l2tp = skb_header_pointer(skb, 0, sizeof(struct udp_l2tp_data_hdr), &l2tph); |
| 204 | if (unlikely(!l2tp)) { |
| 205 | ret = -EINVAL; |
| 206 | goto restore_udp; |
| 207 | } |
| 208 | |
| 209 | if (unlikely(!l2tpv2_offload_match(l2tp))) { |
| 210 | ret = -EINVAL; |
| 211 | goto restore_udp; |
| 212 | } |
| 213 | |
| 214 | memcpy(&tnl_params->saddr, eth->h_source, sizeof(u8) * ETH_ALEN); |
| 215 | memcpy(&tnl_params->daddr, eth->h_dest, sizeof(u8) * ETH_ALEN); |
| 216 | tnl_params->protocol = ip->protocol; |
| 217 | tnl_params->sip = ip->saddr; |
| 218 | tnl_params->dip = ip->daddr; |
| 219 | tnl_params->sport = udp->source; |
| 220 | tnl_params->dport = udp->dest; |
| 221 | tnl_params->priv.l2tp.tid = l2tp->tid; |
| 222 | tnl_params->priv.l2tp.sid = l2tp->sid; |
| 223 | |
| 224 | restore_udp: |
| 225 | skb_push(skb, sizeof(struct udphdr)); |
| 226 | restore_ip: |
| 227 | skb_push(skb, sizeof(struct iphdr)); |
| 228 | out: |
| 229 | return ret; |
| 230 | } |
| 231 | |
| 232 | static int udp_l2tp_data_tnl_debug_param_setup(const char *buf, int *ofs, |
| 233 | struct tops_tnl_params *tnl_params) |
| 234 | { |
| 235 | return -EPERM; //TODO: not implemented |
| 236 | } |
| 237 | |
| 238 | static bool udp_l2tp_data_tnl_info_match(struct tops_tnl_params *params1, |
| 239 | struct tops_tnl_params *params2) |
| 240 | { |
| 241 | if (params1->sip == params2->sip |
| 242 | && params1->dip == params2->dip |
| 243 | && params1->sport == params2->sport |
| 244 | && params1->dport == params2->dport |
| 245 | && params1->priv.l2tp.tid == params2->priv.l2tp.tid |
| 246 | && params1->priv.l2tp.sid == params2->priv.l2tp.sid |
| 247 | && !memcmp(params1->saddr, params2->saddr, sizeof(u8) * ETH_ALEN) |
| 248 | && !memcmp(params1->daddr, params2->daddr, sizeof(u8) * ETH_ALEN)) |
| 249 | return true; |
| 250 | |
| 251 | return false; |
| 252 | } |
| 253 | |
| 254 | static bool udp_l2tp_data_tnl_decap_offloadable(struct sk_buff *skb) |
| 255 | { |
| 256 | struct udp_l2tp_data_hdr *l2tp; |
| 257 | struct udp_l2tp_data_hdr l2tph; |
| 258 | struct ppp_hdr *ppp; |
| 259 | struct ppp_hdr ppph; |
| 260 | struct udphdr *udp; |
| 261 | struct iphdr *ip; |
| 262 | |
| 263 | ip = ip_hdr(skb); |
| 264 | if (ip->protocol != IPPROTO_UDP) |
| 265 | return false; |
| 266 | |
| 267 | udp = udp_hdr(skb); |
| 268 | if (ntohs(udp->dest) != UDP_L2TP_PORT) |
| 269 | return false; |
| 270 | |
| 271 | l2tp = skb_header_pointer(skb, ip_hdr(skb)->ihl * 4 + sizeof(struct udphdr), |
| 272 | sizeof(struct udp_l2tp_data_hdr), &l2tph); |
| 273 | |
| 274 | if (unlikely(!l2tp)) |
| 275 | return false; |
| 276 | |
| 277 | if (unlikely(!l2tpv2_offload_match(l2tp))) |
| 278 | return false; |
| 279 | |
| 280 | ppp = skb_header_pointer(skb, (ip_hdr(skb)->ihl * 4 + |
| 281 | sizeof(struct udphdr) + |
| 282 | sizeof(struct udp_l2tp_data_hdr)), |
| 283 | sizeof(struct ppp_hdr), &ppph); |
| 284 | |
| 285 | if (unlikely(!ppp)) |
| 286 | return false; |
| 287 | |
| 288 | if (unlikely(!ppp_offload_match(ppp))) |
| 289 | return false; |
| 290 | |
| 291 | return true; |
| 292 | } |
| 293 | |
| 294 | static struct tops_tnl_type udp_l2tp_data_type = { |
| 295 | .type_name = "udp-l2tp-data", |
| 296 | .tnl_decap_param_setup = udp_l2tp_data_tnl_decap_param_setup, |
| 297 | .tnl_encap_param_setup = udp_l2tp_data_tnl_encap_param_setup, |
| 298 | .tnl_debug_param_setup = udp_l2tp_data_tnl_debug_param_setup, |
| 299 | .tnl_info_match = udp_l2tp_data_tnl_info_match, |
| 300 | .tnl_decap_offloadable = udp_l2tp_data_tnl_decap_offloadable, |
| 301 | .tops_entry = TOPS_ENTRY_UDP_L2TP_DATA, |
| 302 | .has_inner_eth = false, |
| 303 | }; |
| 304 | |
| 305 | int mtk_tops_udp_l2tp_data_init(void) |
| 306 | { |
| 307 | int ret = 0; |
| 308 | |
| 309 | ret = mtk_tops_tnl_type_register(&udp_l2tp_data_type); |
| 310 | if (ret) |
| 311 | return ret; |
| 312 | |
| 313 | ret = mtk_pce_cls_entry_register(&udp_l2tp_data_cls_entry); |
| 314 | if (ret) { |
| 315 | mtk_tops_tnl_type_unregister(&udp_l2tp_data_type); |
| 316 | return ret; |
| 317 | } |
| 318 | |
| 319 | return ret; |
| 320 | } |
| 321 | |
| 322 | void mtk_tops_udp_l2tp_data_deinit(void) |
| 323 | { |
| 324 | mtk_pce_cls_entry_unregister(&udp_l2tp_data_cls_entry); |
| 325 | |
| 326 | mtk_tops_tnl_type_unregister(&udp_l2tp_data_type); |
| 327 | } |