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 (dst->lwtstate->type == LWTUNNEL_ENCAP_IP || 50 dst->lwtstate->type == LWTUNNEL_ENCAP_IP6)) 51 return lwt_tun_info(dst->lwtstate); 52 53 return NULL; 54 } 55 56 static inline bool skb_valid_dst(const struct sk_buff *skb) 57 { 58 struct dst_entry *dst = skb_dst(skb); 59 60 return dst && !(dst->flags & DST_METADATA); 61 } 62 63 static inline int skb_metadata_dst_cmp(const struct sk_buff *skb_a, 64 const struct sk_buff *skb_b) 65 { 66 const struct metadata_dst *a, *b; 67 68 if (!(skb_a->_skb_refdst | skb_b->_skb_refdst)) 69 return 0; 70 71 a = (const struct metadata_dst *) skb_dst(skb_a); 72 b = (const struct metadata_dst *) skb_dst(skb_b); 73 74 if (!a != !b || a->type != b->type) 75 return 1; 76 77 switch (a->type) { 78 case METADATA_HW_PORT_MUX: 79 return memcmp(&a->u.port_info, &b->u.port_info, 80 sizeof(a->u.port_info)); 81 case METADATA_IP_TUNNEL: 82 return memcmp(&a->u.tun_info, &b->u.tun_info, 83 sizeof(a->u.tun_info) + 84 a->u.tun_info.options_len); 85 default: 86 return 1; 87 } 88 } 89 90 void metadata_dst_free(struct metadata_dst *); 91 struct metadata_dst *metadata_dst_alloc(u8 optslen, enum metadata_type type, 92 gfp_t flags); 93 void metadata_dst_free_percpu(struct metadata_dst __percpu *md_dst); 94 struct metadata_dst __percpu * 95 metadata_dst_alloc_percpu(u8 optslen, enum metadata_type type, gfp_t flags); 96 97 static inline struct metadata_dst *tun_rx_dst(int md_size) 98 { 99 struct metadata_dst *tun_dst; 100 101 tun_dst = metadata_dst_alloc(md_size, METADATA_IP_TUNNEL, GFP_ATOMIC); 102 if (!tun_dst) 103 return NULL; 104 105 tun_dst->u.tun_info.options_len = 0; 106 tun_dst->u.tun_info.mode = 0; 107 return tun_dst; 108 } 109 110 static inline struct metadata_dst *tun_dst_unclone(struct sk_buff *skb) 111 { 112 struct metadata_dst *md_dst = skb_metadata_dst(skb); 113 int md_size; 114 struct metadata_dst *new_md; 115 116 if (!md_dst || md_dst->type != METADATA_IP_TUNNEL) 117 return ERR_PTR(-EINVAL); 118 119 md_size = md_dst->u.tun_info.options_len; 120 new_md = metadata_dst_alloc(md_size, METADATA_IP_TUNNEL, GFP_ATOMIC); 121 if (!new_md) 122 return ERR_PTR(-ENOMEM); 123 124 memcpy(&new_md->u.tun_info, &md_dst->u.tun_info, 125 sizeof(struct ip_tunnel_info) + md_size); 126 #ifdef CONFIG_DST_CACHE 127 /* Unclone the dst cache if there is one */ 128 if (new_md->u.tun_info.dst_cache.cache) { 129 int ret; 130 131 ret = dst_cache_init(&new_md->u.tun_info.dst_cache, GFP_ATOMIC); 132 if (ret) { 133 metadata_dst_free(new_md); 134 return ERR_PTR(ret); 135 } 136 } 137 #endif 138 139 skb_dst_drop(skb); 140 skb_dst_set(skb, &new_md->dst); 141 return new_md; 142 } 143 144 static inline struct ip_tunnel_info *skb_tunnel_info_unclone(struct sk_buff *skb) 145 { 146 struct metadata_dst *dst; 147 148 dst = tun_dst_unclone(skb); 149 if (IS_ERR(dst)) 150 return NULL; 151 152 return &dst->u.tun_info; 153 } 154 155 static inline struct metadata_dst *__ip_tun_set_dst(__be32 saddr, 156 __be32 daddr, 157 __u8 tos, __u8 ttl, 158 __be16 tp_dst, 159 __be16 flags, 160 __be64 tunnel_id, 161 int md_size) 162 { 163 struct metadata_dst *tun_dst; 164 165 tun_dst = tun_rx_dst(md_size); 166 if (!tun_dst) 167 return NULL; 168 169 ip_tunnel_key_init(&tun_dst->u.tun_info.key, 170 saddr, daddr, tos, ttl, 171 0, 0, tp_dst, tunnel_id, flags); 172 return tun_dst; 173 } 174 175 static inline struct metadata_dst *ip_tun_rx_dst(struct sk_buff *skb, 176 __be16 flags, 177 __be64 tunnel_id, 178 int md_size) 179 { 180 const struct iphdr *iph = ip_hdr(skb); 181 182 return __ip_tun_set_dst(iph->saddr, iph->daddr, iph->tos, iph->ttl, 183 0, flags, tunnel_id, md_size); 184 } 185 186 static inline struct metadata_dst *__ipv6_tun_set_dst(const struct in6_addr *saddr, 187 const struct in6_addr *daddr, 188 __u8 tos, __u8 ttl, 189 __be16 tp_dst, 190 __be32 label, 191 __be16 flags, 192 __be64 tunnel_id, 193 int md_size) 194 { 195 struct metadata_dst *tun_dst; 196 struct ip_tunnel_info *info; 197 198 tun_dst = tun_rx_dst(md_size); 199 if (!tun_dst) 200 return NULL; 201 202 info = &tun_dst->u.tun_info; 203 info->mode = IP_TUNNEL_INFO_IPV6; 204 info->key.tun_flags = flags; 205 info->key.tun_id = tunnel_id; 206 info->key.tp_src = 0; 207 info->key.tp_dst = tp_dst; 208 209 info->key.u.ipv6.src = *saddr; 210 info->key.u.ipv6.dst = *daddr; 211 212 info->key.tos = tos; 213 info->key.ttl = ttl; 214 info->key.label = label; 215 216 return tun_dst; 217 } 218 219 static inline struct metadata_dst *ipv6_tun_rx_dst(struct sk_buff *skb, 220 __be16 flags, 221 __be64 tunnel_id, 222 int md_size) 223 { 224 const struct ipv6hdr *ip6h = ipv6_hdr(skb); 225 226 return __ipv6_tun_set_dst(&ip6h->saddr, &ip6h->daddr, 227 ipv6_get_dsfield(ip6h), ip6h->hop_limit, 228 0, ip6_flowlabel(ip6h), flags, tunnel_id, 229 md_size); 230 } 231 #endif /* __NET_DST_METADATA_H */ 232