1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef __NET_DST_METADATA_H 3 #define __NET_DST_METADATA_H 1 4 5 #include <linux/skbuff.h> 6 #include <net/ip_tunnels.h> 7 #include <net/dst.h> 8 9 enum metadata_type { 10 METADATA_IP_TUNNEL, 11 METADATA_HW_PORT_MUX, 12 }; 13 14 struct hw_port_info { 15 struct net_device *lower_dev; 16 u32 port_id; 17 }; 18 19 struct metadata_dst { 20 struct dst_entry dst; 21 enum metadata_type type; 22 union { 23 struct ip_tunnel_info tun_info; 24 struct hw_port_info port_info; 25 } u; 26 }; 27 28 static inline struct metadata_dst *skb_metadata_dst(const struct sk_buff *skb) 29 { 30 struct metadata_dst *md_dst = (struct metadata_dst *) skb_dst(skb); 31 32 if (md_dst && md_dst->dst.flags & DST_METADATA) 33 return md_dst; 34 35 return NULL; 36 } 37 38 static inline struct ip_tunnel_info * 39 skb_tunnel_info(const struct sk_buff *skb) 40 { 41 struct metadata_dst *md_dst = skb_metadata_dst(skb); 42 struct dst_entry *dst; 43 44 if (md_dst && md_dst->type == METADATA_IP_TUNNEL) 45 return &md_dst->u.tun_info; 46 47 dst = skb_dst(skb); 48 if (dst && dst->lwtstate) 49 return lwt_tun_info(dst->lwtstate); 50 51 return NULL; 52 } 53 54 static inline bool skb_valid_dst(const struct sk_buff *skb) 55 { 56 struct dst_entry *dst = skb_dst(skb); 57 58 return dst && !(dst->flags & DST_METADATA); 59 } 60 61 static inline int skb_metadata_dst_cmp(const struct sk_buff *skb_a, 62 const struct sk_buff *skb_b) 63 { 64 const struct metadata_dst *a, *b; 65 66 if (!(skb_a->_skb_refdst | skb_b->_skb_refdst)) 67 return 0; 68 69 a = (const struct metadata_dst *) skb_dst(skb_a); 70 b = (const struct metadata_dst *) skb_dst(skb_b); 71 72 if (!a != !b || a->type != b->type) 73 return 1; 74 75 switch (a->type) { 76 case METADATA_HW_PORT_MUX: 77 return memcmp(&a->u.port_info, &b->u.port_info, 78 sizeof(a->u.port_info)); 79 case METADATA_IP_TUNNEL: 80 return memcmp(&a->u.tun_info, &b->u.tun_info, 81 sizeof(a->u.tun_info) + 82 a->u.tun_info.options_len); 83 default: 84 return 1; 85 } 86 } 87 88 void metadata_dst_free(struct metadata_dst *); 89 struct metadata_dst *metadata_dst_alloc(u8 optslen, enum metadata_type type, 90 gfp_t flags); 91 void metadata_dst_free_percpu(struct metadata_dst __percpu *md_dst); 92 struct metadata_dst __percpu * 93 metadata_dst_alloc_percpu(u8 optslen, enum metadata_type type, gfp_t flags); 94 95 static inline struct metadata_dst *tun_rx_dst(int md_size) 96 { 97 struct metadata_dst *tun_dst; 98 99 tun_dst = metadata_dst_alloc(md_size, METADATA_IP_TUNNEL, GFP_ATOMIC); 100 if (!tun_dst) 101 return NULL; 102 103 tun_dst->u.tun_info.options_len = 0; 104 tun_dst->u.tun_info.mode = 0; 105 return tun_dst; 106 } 107 108 static inline struct metadata_dst *tun_dst_unclone(struct sk_buff *skb) 109 { 110 struct metadata_dst *md_dst = skb_metadata_dst(skb); 111 int md_size; 112 struct metadata_dst *new_md; 113 114 if (!md_dst || md_dst->type != METADATA_IP_TUNNEL) 115 return ERR_PTR(-EINVAL); 116 117 md_size = md_dst->u.tun_info.options_len; 118 new_md = metadata_dst_alloc(md_size, METADATA_IP_TUNNEL, GFP_ATOMIC); 119 if (!new_md) 120 return ERR_PTR(-ENOMEM); 121 122 memcpy(&new_md->u.tun_info, &md_dst->u.tun_info, 123 sizeof(struct ip_tunnel_info) + md_size); 124 skb_dst_drop(skb); 125 dst_hold(&new_md->dst); 126 skb_dst_set(skb, &new_md->dst); 127 return new_md; 128 } 129 130 static inline struct ip_tunnel_info *skb_tunnel_info_unclone(struct sk_buff *skb) 131 { 132 struct metadata_dst *dst; 133 134 dst = tun_dst_unclone(skb); 135 if (IS_ERR(dst)) 136 return NULL; 137 138 return &dst->u.tun_info; 139 } 140 141 static inline struct metadata_dst *__ip_tun_set_dst(__be32 saddr, 142 __be32 daddr, 143 __u8 tos, __u8 ttl, 144 __be16 tp_dst, 145 __be16 flags, 146 __be64 tunnel_id, 147 int md_size) 148 { 149 struct metadata_dst *tun_dst; 150 151 tun_dst = tun_rx_dst(md_size); 152 if (!tun_dst) 153 return NULL; 154 155 ip_tunnel_key_init(&tun_dst->u.tun_info.key, 156 saddr, daddr, tos, ttl, 157 0, 0, tp_dst, tunnel_id, flags); 158 return tun_dst; 159 } 160 161 static inline struct metadata_dst *ip_tun_rx_dst(struct sk_buff *skb, 162 __be16 flags, 163 __be64 tunnel_id, 164 int md_size) 165 { 166 const struct iphdr *iph = ip_hdr(skb); 167 168 return __ip_tun_set_dst(iph->saddr, iph->daddr, iph->tos, iph->ttl, 169 0, flags, tunnel_id, md_size); 170 } 171 172 static inline struct metadata_dst *__ipv6_tun_set_dst(const struct in6_addr *saddr, 173 const struct in6_addr *daddr, 174 __u8 tos, __u8 ttl, 175 __be16 tp_dst, 176 __be32 label, 177 __be16 flags, 178 __be64 tunnel_id, 179 int md_size) 180 { 181 struct metadata_dst *tun_dst; 182 struct ip_tunnel_info *info; 183 184 tun_dst = tun_rx_dst(md_size); 185 if (!tun_dst) 186 return NULL; 187 188 info = &tun_dst->u.tun_info; 189 info->mode = IP_TUNNEL_INFO_IPV6; 190 info->key.tun_flags = flags; 191 info->key.tun_id = tunnel_id; 192 info->key.tp_src = 0; 193 info->key.tp_dst = tp_dst; 194 195 info->key.u.ipv6.src = *saddr; 196 info->key.u.ipv6.dst = *daddr; 197 198 info->key.tos = tos; 199 info->key.ttl = ttl; 200 info->key.label = label; 201 202 return tun_dst; 203 } 204 205 static inline struct metadata_dst *ipv6_tun_rx_dst(struct sk_buff *skb, 206 __be16 flags, 207 __be64 tunnel_id, 208 int md_size) 209 { 210 const struct ipv6hdr *ip6h = ipv6_hdr(skb); 211 212 return __ipv6_tun_set_dst(&ip6h->saddr, &ip6h->daddr, 213 ipv6_get_dsfield(ip6h), ip6h->hop_limit, 214 0, ip6_flowlabel(ip6h), flags, tunnel_id, 215 md_size); 216 } 217 #endif /* __NET_DST_METADATA_H */ 218