developer | 0fb30d5 | 2023-12-04 09:51:36 +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/netdevice.h> |
| 10 | |
| 11 | #include <pce/cls.h> |
| 12 | #include <pce/netsys.h> |
| 13 | #include <pce/pce.h> |
| 14 | |
| 15 | #include "tops/internal.h" |
| 16 | #include "tops/protocol/mac/ppp.h" |
| 17 | #include "tops/protocol/transport/udp.h" |
| 18 | #include "tops/protocol/tunnel/l2tp/l2tpv2.h" |
| 19 | #include "tops/tunnel.h" |
| 20 | |
| 21 | static int l2tpv2_cls_entry_setup(struct tops_tnl_info *tnl_info, |
| 22 | struct cls_desc *cdesc) |
| 23 | { |
| 24 | CLS_DESC_DATA(cdesc, fport, PSE_PORT_PPE0); |
| 25 | CLS_DESC_DATA(cdesc, tport_idx, 0x4); |
| 26 | CLS_DESC_MASK_DATA(cdesc, tag, CLS_DESC_TAG_MASK, CLS_DESC_TAG_MATCH_L4_USR); |
| 27 | CLS_DESC_MASK_DATA(cdesc, dip_match, CLS_DESC_DIP_MATCH, CLS_DESC_DIP_MATCH); |
| 28 | CLS_DESC_MASK_DATA(cdesc, l4_type, CLS_DESC_L4_TYPE_MASK, IPPROTO_UDP); |
| 29 | CLS_DESC_MASK_DATA(cdesc, l4_valid, |
| 30 | CLS_DESC_L4_VALID_MASK, |
| 31 | CLS_DESC_VALID_UPPER_HALF_WORD_BIT | |
| 32 | CLS_DESC_VALID_LOWER_HALF_WORD_BIT | |
| 33 | CLS_DESC_VALID_DPORT_BIT); |
| 34 | CLS_DESC_MASK_DATA(cdesc, l4_dport, CLS_DESC_L4_DPORT_MASK, 1701); |
| 35 | CLS_DESC_MASK_DATA(cdesc, l4_hdr_usr_data, 0x80030000, 0x00020000); |
| 36 | |
| 37 | return 0; |
| 38 | } |
| 39 | |
| 40 | static inline bool l2tpv2_offload_valid(struct sk_buff *skb) |
| 41 | { |
| 42 | struct udp_l2tp_data_hdr *l2tp; |
| 43 | struct udp_l2tp_data_hdr l2tph; |
| 44 | u16 hdrflags; |
| 45 | |
| 46 | l2tp = skb_header_pointer(skb, 0, sizeof(struct udp_l2tp_data_hdr), &l2tph); |
| 47 | if (!l2tp) |
| 48 | return false; |
| 49 | |
| 50 | hdrflags = ntohs(l2tp->flag_ver); |
| 51 | |
| 52 | return ((hdrflags & L2TP_HDR_VER_MASK) == L2TP_HDR_VER_2 && |
| 53 | !(hdrflags & L2TP_HDRFLAG_T)); |
| 54 | } |
| 55 | |
| 56 | static int l2tpv2_tnl_decap_param_setup(struct sk_buff *skb, |
| 57 | struct tops_params *params) |
| 58 | { |
| 59 | struct tops_l2tp_params *l2tpp; |
| 60 | struct udp_l2tp_data_hdr *l2tp; |
| 61 | struct udp_l2tp_data_hdr l2tph; |
| 62 | int ret = 0; |
| 63 | |
| 64 | /* ppp */ |
| 65 | skb_push(skb, sizeof(struct ppp_hdr)); |
| 66 | if (unlikely(!mtk_tops_ppp_valid(skb))) { |
| 67 | ret = -EINVAL; |
| 68 | goto restore_ppp; |
| 69 | } |
| 70 | |
| 71 | /* l2tp */ |
| 72 | skb_push(skb, sizeof(struct udp_l2tp_data_hdr)); |
| 73 | if (unlikely(!l2tpv2_offload_valid(skb))) { |
| 74 | ret = -EINVAL; |
| 75 | goto restore_l2tp; |
| 76 | } |
| 77 | |
| 78 | l2tp = skb_header_pointer(skb, 0, sizeof(struct udp_l2tp_data_hdr), &l2tph); |
| 79 | if (unlikely(!l2tp)) { |
| 80 | ret = -EINVAL; |
| 81 | goto restore_l2tp; |
| 82 | } |
| 83 | |
| 84 | params->tunnel.type = TOPS_TUNNEL_L2TP_V2; |
| 85 | |
| 86 | l2tpp = ¶ms->tunnel.l2tp; |
| 87 | l2tpp->tid = l2tp->tid; |
| 88 | l2tpp->sid = l2tp->sid; |
| 89 | |
| 90 | ret = mtk_tops_transport_decap_param_setup(skb, params); |
| 91 | |
| 92 | restore_l2tp: |
| 93 | skb_pull(skb, sizeof(struct udp_l2tp_data_hdr)); |
| 94 | |
| 95 | restore_ppp: |
| 96 | skb_pull(skb, sizeof(struct ppp_hdr)); |
| 97 | |
| 98 | return ret; |
| 99 | } |
| 100 | |
| 101 | static int l2tpv2_tnl_encap_param_setup(struct sk_buff *skb, |
| 102 | struct tops_params *params) |
| 103 | { |
| 104 | struct tops_l2tp_params *l2tpp; |
| 105 | struct udp_l2tp_data_hdr *l2tp; |
| 106 | struct udp_l2tp_data_hdr l2tph; |
| 107 | |
| 108 | if (unlikely(!l2tpv2_offload_valid(skb))) |
| 109 | return -EINVAL; |
| 110 | |
| 111 | l2tp = skb_header_pointer(skb, 0, sizeof(struct udp_l2tp_data_hdr), &l2tph); |
| 112 | if (unlikely(!l2tp)) |
| 113 | return -EINVAL; |
| 114 | |
| 115 | params->tunnel.type = TOPS_TUNNEL_L2TP_V2; |
| 116 | |
| 117 | l2tpp = ¶ms->tunnel.l2tp; |
| 118 | l2tpp->tid = l2tp->tid; |
| 119 | l2tpp->sid = l2tp->sid; |
| 120 | |
| 121 | return 0; |
| 122 | } |
| 123 | |
| 124 | static int l2tpv2_tnl_debug_param_setup(const char *buf, int *ofs, |
| 125 | struct tops_params *params) |
| 126 | { |
| 127 | struct tops_l2tp_params *l2tpp; |
| 128 | int nchar = 0; |
| 129 | int ret; |
| 130 | u16 tid = 0; |
| 131 | u16 sid = 0; |
| 132 | |
| 133 | params->tunnel.type = TOPS_TUNNEL_L2TP_V2; |
| 134 | l2tpp = ¶ms->tunnel.l2tp; |
| 135 | |
| 136 | ret = sscanf(buf + *ofs, "%hu %hu %n", &tid, &sid, &nchar); |
| 137 | if (ret != 2) |
| 138 | return -EINVAL; |
| 139 | |
| 140 | l2tpp->tid = htons(tid); |
| 141 | l2tpp->sid = htons(sid); |
| 142 | |
| 143 | *ofs += nchar; |
| 144 | |
| 145 | return 0; |
| 146 | } |
| 147 | |
| 148 | static int l2tpv2_tnl_l2_param_update(struct sk_buff *skb, |
| 149 | struct tops_params *params) |
| 150 | { |
| 151 | struct ethhdr *eth = eth_hdr(skb); |
| 152 | struct tops_mac_params *mac = ¶ms->mac; |
| 153 | |
| 154 | memcpy(&mac->eth.h_source, eth->h_source, sizeof(u8) * ETH_ALEN); |
| 155 | memcpy(&mac->eth.h_dest, eth->h_dest, sizeof(u8) * ETH_ALEN); |
| 156 | |
| 157 | return 1; |
| 158 | } |
| 159 | |
| 160 | static bool l2tpv2_tnl_decap_offloadable(struct sk_buff *skb) |
| 161 | { |
| 162 | struct iphdr *ip; |
| 163 | bool ret = true; |
| 164 | u32 ip_len; |
| 165 | |
| 166 | ip = ip_hdr(skb); |
| 167 | if (ip->protocol != IPPROTO_UDP) |
| 168 | return false; |
| 169 | |
| 170 | ip_len = ip_hdr(skb)->ihl * 4; |
| 171 | |
| 172 | skb_pull(skb, ip_len + sizeof(struct udphdr)); |
| 173 | if (!l2tpv2_offload_valid(skb)) { |
| 174 | ret = false; |
| 175 | goto restore_ip_udp; |
| 176 | } |
| 177 | |
| 178 | skb_pull(skb, sizeof(struct udp_l2tp_data_hdr)); |
| 179 | if (!mtk_tops_ppp_valid(skb)) { |
| 180 | ret = false; |
| 181 | goto restore_l2tp; |
| 182 | } |
| 183 | |
| 184 | restore_l2tp: |
| 185 | skb_push(skb, sizeof(struct udp_l2tp_data_hdr)); |
| 186 | restore_ip_udp: |
| 187 | skb_push(skb, ip_len + sizeof(struct udphdr)); |
| 188 | |
| 189 | return ret; |
| 190 | } |
| 191 | |
| 192 | static void l2tpv2_tnl_param_dump(struct seq_file *s, struct tops_params *params) |
| 193 | { |
| 194 | struct tops_l2tp_params *l2tpp = ¶ms->tunnel.l2tp; |
| 195 | |
| 196 | seq_puts(s, "\tTunnel Type: L2TPv2 "); |
| 197 | seq_printf(s, "tunnel ID: %05u session ID: %05u\n", |
| 198 | ntohs(l2tpp->tid), ntohs(l2tpp->sid)); |
| 199 | } |
| 200 | |
| 201 | static struct tops_tnl_type l2tpv2_type = { |
| 202 | .type_name = "l2tpv2", |
| 203 | .cls_entry_setup = l2tpv2_cls_entry_setup, |
| 204 | .tnl_decap_param_setup = l2tpv2_tnl_decap_param_setup, |
| 205 | .tnl_encap_param_setup = l2tpv2_tnl_encap_param_setup, |
| 206 | .tnl_debug_param_setup = l2tpv2_tnl_debug_param_setup, |
| 207 | .tnl_decap_offloadable = l2tpv2_tnl_decap_offloadable, |
| 208 | .tnl_l2_param_update = l2tpv2_tnl_l2_param_update, |
| 209 | .tnl_param_dump = l2tpv2_tnl_param_dump, |
| 210 | .tnl_proto_type = TOPS_TUNNEL_L2TP_V2, |
| 211 | .has_inner_eth = false, |
| 212 | }; |
| 213 | |
| 214 | int mtk_tops_l2tpv2_init(void) |
| 215 | { |
| 216 | return mtk_tops_tnl_type_register(&l2tpv2_type); |
| 217 | } |
| 218 | |
| 219 | void mtk_tops_l2tpv2_deinit(void) |
| 220 | { |
| 221 | mtk_tops_tnl_type_unregister(&l2tpv2_type); |
| 222 | } |