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: Ren-Ting Wang <ren-ting.wang@mediatek.com> |
| 6 | */ |
| 7 | |
| 8 | #include <net/gre.h> |
| 9 | |
| 10 | #include <pce/cls.h> |
developer | 15ee46c | 2023-08-24 16:35:34 +0800 | [diff] [blame] | 11 | #include <pce/netsys.h> |
developer | e5e687d | 2023-08-08 16:05:33 +0800 | [diff] [blame] | 12 | #include <pce/pce.h> |
| 13 | |
| 14 | #include "tunnel.h" |
| 15 | |
developer | 15ee46c | 2023-08-24 16:35:34 +0800 | [diff] [blame] | 16 | static int gretap_cls_entry_setup(struct tops_tnl_info *tnl_info, |
| 17 | struct cls_desc *cdesc) |
| 18 | { |
| 19 | CLS_DESC_DATA(cdesc, fport, PSE_PORT_PPE0); |
| 20 | CLS_DESC_DATA(cdesc, tport_idx, 0x4); |
| 21 | CLS_DESC_MASK_DATA(cdesc, tag, CLS_DESC_TAG_MASK, CLS_DESC_TAG_MATCH_L4_HDR); |
| 22 | CLS_DESC_MASK_DATA(cdesc, dip_match, CLS_DESC_DIP_MATCH, CLS_DESC_DIP_MATCH); |
| 23 | CLS_DESC_MASK_DATA(cdesc, l4_type, CLS_DESC_L4_TYPE_MASK, IPPROTO_GRE); |
| 24 | CLS_DESC_MASK_DATA(cdesc, l4_udp_hdr_nez, |
| 25 | CLS_DESC_UDPLITE_L4_HDR_NEZ_MASK, |
| 26 | CLS_DESC_UDPLITE_L4_HDR_NEZ_MASK); |
| 27 | CLS_DESC_MASK_DATA(cdesc, l4_valid, |
| 28 | CLS_DESC_L4_VALID_MASK, |
| 29 | CLS_DESC_VALID_UPPER_HALF_WORD_BIT | |
| 30 | CLS_DESC_VALID_LOWER_HALF_WORD_BIT); |
| 31 | CLS_DESC_MASK_DATA(cdesc, l4_hdr_usr_data, 0x0000FFFF, 0x00006558); |
| 32 | |
| 33 | return 0; |
| 34 | } |
developer | e5e687d | 2023-08-08 16:05:33 +0800 | [diff] [blame] | 35 | |
| 36 | static int gretap_tnl_decap_param_setup(struct sk_buff *skb, |
| 37 | struct tops_tnl_params *tnl_params) |
| 38 | { |
| 39 | struct gre_base_hdr *pgre; |
| 40 | struct gre_base_hdr greh; |
| 41 | struct ethhdr *eth; |
| 42 | struct ethhdr ethh; |
| 43 | struct iphdr *ip; |
| 44 | struct iphdr iph; |
| 45 | int ret = 0; |
| 46 | |
| 47 | if (!skb->dev->rtnl_link_ops |
| 48 | || strcmp(skb->dev->rtnl_link_ops->kind, "gretap")) |
| 49 | return -EAGAIN; |
| 50 | |
| 51 | skb_push(skb, sizeof(struct gre_base_hdr)); |
| 52 | pgre = skb_header_pointer(skb, 0, sizeof(struct gre_base_hdr), &greh); |
| 53 | if (unlikely(!pgre)) { |
| 54 | ret = -EINVAL; |
| 55 | goto restore_gre; |
| 56 | } |
| 57 | |
| 58 | if (unlikely(ntohs(pgre->protocol) != ETH_P_TEB)) { |
| 59 | pr_notice("gre: %p protocol unmatched, proto: 0x%x\n", |
| 60 | pgre, ntohs(pgre->protocol)); |
| 61 | ret = -EINVAL; |
| 62 | goto restore_gre; |
| 63 | } |
| 64 | |
| 65 | /* TODO: store gre parameters? */ |
| 66 | |
| 67 | skb_push(skb, sizeof(struct iphdr)); |
| 68 | ip = skb_header_pointer(skb, 0, sizeof(struct iphdr), &iph); |
| 69 | if (unlikely(!ip)) { |
| 70 | ret = -EINVAL; |
| 71 | goto restore_ip; |
| 72 | } |
| 73 | |
| 74 | if (unlikely(ip->version != IPVERSION || ip->protocol != IPPROTO_GRE)) { |
| 75 | pr_notice("ip: %p version or protocol unmatched, ver: 0x%x, proto: 0x%x\n", |
| 76 | ip, ip->version, ip->protocol); |
| 77 | ret = -EINVAL; |
| 78 | goto restore_ip; |
| 79 | } |
| 80 | |
| 81 | /* TODO: check ip options is support for us? */ |
| 82 | /* TODO: store ip parameters? */ |
| 83 | tnl_params->protocol = ip->protocol; |
| 84 | tnl_params->sip = ip->daddr; |
| 85 | tnl_params->dip = ip->saddr; |
| 86 | |
| 87 | skb_push(skb, sizeof(struct ethhdr)); |
| 88 | eth = skb_header_pointer(skb, 0, sizeof(struct ethhdr), ðh); |
| 89 | if (unlikely(!eth)) { |
| 90 | ret = -EINVAL; |
| 91 | goto restore_eth; |
| 92 | } |
| 93 | |
| 94 | if (unlikely(ntohs(eth->h_proto) != ETH_P_IP)) { |
| 95 | pr_notice("eth proto not support, proto: 0x%x\n", |
| 96 | ntohs(eth->h_proto)); |
| 97 | ret = -EINVAL; |
| 98 | goto restore_eth; |
| 99 | } |
| 100 | |
| 101 | memcpy(&tnl_params->saddr, eth->h_dest, sizeof(u8) * ETH_ALEN); |
| 102 | memcpy(&tnl_params->daddr, eth->h_source, sizeof(u8) * ETH_ALEN); |
| 103 | |
| 104 | restore_eth: |
| 105 | skb_pull(skb, sizeof(struct ethhdr)); |
| 106 | |
| 107 | restore_ip: |
| 108 | skb_pull(skb, sizeof(struct iphdr)); |
| 109 | |
| 110 | restore_gre: |
| 111 | skb_pull(skb, sizeof(struct gre_base_hdr)); |
| 112 | |
| 113 | return ret; |
| 114 | } |
| 115 | |
| 116 | static int gretap_tnl_encap_param_setup(struct sk_buff *skb, |
| 117 | struct tops_tnl_params *tnl_params) |
| 118 | { |
| 119 | struct ethhdr *eth = eth_hdr(skb); |
| 120 | struct iphdr *ip = ip_hdr(skb); |
| 121 | |
| 122 | /* |
| 123 | * ether type no need to check since it is even not constructed yet |
| 124 | * currently not support gre without ipv4 |
| 125 | */ |
| 126 | if (unlikely(ip->version != IPVERSION || ip->protocol != IPPROTO_GRE)) { |
| 127 | pr_notice("eth proto: 0x%x, ip ver: 0x%x, proto: 0x%x is not support\n", |
| 128 | ntohs(eth->h_proto), |
| 129 | ip->version, |
| 130 | ip->protocol); |
| 131 | return -EINVAL; |
| 132 | } |
| 133 | |
| 134 | memcpy(&tnl_params->saddr, eth->h_source, sizeof(u8) * ETH_ALEN); |
| 135 | memcpy(&tnl_params->daddr, eth->h_dest, sizeof(u8) * ETH_ALEN); |
| 136 | tnl_params->protocol = ip->protocol; |
| 137 | tnl_params->sip = ip->saddr; |
| 138 | tnl_params->dip = ip->daddr; |
| 139 | |
| 140 | return 0; |
| 141 | } |
| 142 | |
| 143 | static int gretap_tnl_debug_param_setup(const char *buf, int *ofs, |
| 144 | struct tops_tnl_params *tnl_params) |
| 145 | { |
| 146 | tnl_params->protocol = IPPROTO_GRE; |
| 147 | return 0; |
| 148 | } |
| 149 | |
| 150 | static bool gretap_tnl_info_match(struct tops_tnl_params *parms1, |
| 151 | struct tops_tnl_params *parms2) |
| 152 | { |
| 153 | if (parms1->sip == parms2->sip |
| 154 | && parms1->dip == parms2->dip |
| 155 | && !memcmp(parms1->saddr, parms2->saddr, sizeof(u8) * ETH_ALEN) |
| 156 | && !memcmp(parms1->daddr, parms2->daddr, sizeof(u8) * ETH_ALEN)) { |
| 157 | return true; |
| 158 | } |
| 159 | |
| 160 | return false; |
| 161 | } |
| 162 | |
| 163 | static bool gretap_tnl_decap_offloadable(struct sk_buff *skb) |
| 164 | { |
| 165 | struct iphdr *ip = ip_hdr(skb); |
| 166 | |
| 167 | if (ip->protocol != IPPROTO_GRE) |
| 168 | return false; |
| 169 | |
| 170 | return true; |
| 171 | } |
| 172 | |
| 173 | static struct tops_tnl_type gretap_type = { |
| 174 | .type_name = "gretap", |
developer | 15ee46c | 2023-08-24 16:35:34 +0800 | [diff] [blame] | 175 | .cls_entry_setup = gretap_cls_entry_setup, |
developer | e5e687d | 2023-08-08 16:05:33 +0800 | [diff] [blame] | 176 | .tnl_decap_param_setup = gretap_tnl_decap_param_setup, |
| 177 | .tnl_encap_param_setup = gretap_tnl_encap_param_setup, |
| 178 | .tnl_debug_param_setup = gretap_tnl_debug_param_setup, |
| 179 | .tnl_info_match = gretap_tnl_info_match, |
| 180 | .tnl_decap_offloadable = gretap_tnl_decap_offloadable, |
| 181 | .tops_entry = TOPS_ENTRY_GRETAP, |
| 182 | .has_inner_eth = true, |
| 183 | }; |
| 184 | |
| 185 | int mtk_tops_gretap_init(void) |
| 186 | { |
developer | 15ee46c | 2023-08-24 16:35:34 +0800 | [diff] [blame] | 187 | return mtk_tops_tnl_type_register(&gretap_type); |
developer | e5e687d | 2023-08-08 16:05:33 +0800 | [diff] [blame] | 188 | } |
| 189 | |
| 190 | void mtk_tops_gretap_deinit(void) |
| 191 | { |
developer | e5e687d | 2023-08-08 16:05:33 +0800 | [diff] [blame] | 192 | mtk_tops_tnl_type_unregister(&gretap_type); |
| 193 | } |