1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef __NET_DST_METADATA_H
3 #define __NET_DST_METADATA_H 1
5 #include <linux/skbuff.h>
6 #include <net/ip_tunnels.h>
15 struct net_device *lower_dev;
21 enum metadata_type type;
23 struct ip_tunnel_info tun_info;
24 struct hw_port_info port_info;
28 static inline struct metadata_dst *skb_metadata_dst(struct sk_buff *skb)
30 struct metadata_dst *md_dst = (struct metadata_dst *) skb_dst(skb);
32 if (md_dst && md_dst->dst.flags & DST_METADATA)
38 static inline struct ip_tunnel_info *skb_tunnel_info(struct sk_buff *skb)
40 struct metadata_dst *md_dst = skb_metadata_dst(skb);
41 struct dst_entry *dst;
43 if (md_dst && md_dst->type == METADATA_IP_TUNNEL)
44 return &md_dst->u.tun_info;
47 if (dst && dst->lwtstate &&
48 (dst->lwtstate->type == LWTUNNEL_ENCAP_IP ||
49 dst->lwtstate->type == LWTUNNEL_ENCAP_IP6))
50 return lwt_tun_info(dst->lwtstate);
55 static inline bool skb_valid_dst(const struct sk_buff *skb)
57 struct dst_entry *dst = skb_dst(skb);
59 return dst && !(dst->flags & DST_METADATA);
62 static inline int skb_metadata_dst_cmp(const struct sk_buff *skb_a,
63 const struct sk_buff *skb_b)
65 const struct metadata_dst *a, *b;
67 if (!(skb_a->_skb_refdst | skb_b->_skb_refdst))
70 a = (const struct metadata_dst *) skb_dst(skb_a);
71 b = (const struct metadata_dst *) skb_dst(skb_b);
73 if (!a != !b || a->type != b->type)
77 case METADATA_HW_PORT_MUX:
78 return memcmp(&a->u.port_info, &b->u.port_info,
79 sizeof(a->u.port_info));
80 case METADATA_IP_TUNNEL:
81 return memcmp(&a->u.tun_info, &b->u.tun_info,
82 sizeof(a->u.tun_info) +
83 a->u.tun_info.options_len);
89 void metadata_dst_free(struct metadata_dst *);
90 struct metadata_dst *metadata_dst_alloc(u8 optslen, enum metadata_type type,
92 struct metadata_dst __percpu *
93 metadata_dst_alloc_percpu(u8 optslen, enum metadata_type type, gfp_t flags);
95 static inline struct metadata_dst *tun_rx_dst(int md_size)
97 struct metadata_dst *tun_dst;
99 tun_dst = metadata_dst_alloc(md_size, METADATA_IP_TUNNEL, GFP_ATOMIC);
103 tun_dst->u.tun_info.options_len = 0;
104 tun_dst->u.tun_info.mode = 0;
108 static inline struct metadata_dst *tun_dst_unclone(struct sk_buff *skb)
110 struct metadata_dst *md_dst = skb_metadata_dst(skb);
112 struct metadata_dst *new_md;
114 if (!md_dst || md_dst->type != METADATA_IP_TUNNEL)
115 return ERR_PTR(-EINVAL);
117 md_size = md_dst->u.tun_info.options_len;
118 new_md = metadata_dst_alloc(md_size, METADATA_IP_TUNNEL, GFP_ATOMIC);
120 return ERR_PTR(-ENOMEM);
122 memcpy(&new_md->u.tun_info, &md_dst->u.tun_info,
123 sizeof(struct ip_tunnel_info) + md_size);
124 #ifdef CONFIG_DST_CACHE
125 /* Unclone the dst cache if there is one */
126 if (new_md->u.tun_info.dst_cache.cache) {
129 ret = dst_cache_init(&new_md->u.tun_info.dst_cache, GFP_ATOMIC);
131 metadata_dst_free(new_md);
138 skb_dst_set(skb, &new_md->dst);
142 static inline struct ip_tunnel_info *skb_tunnel_info_unclone(struct sk_buff *skb)
144 struct metadata_dst *dst;
146 dst = tun_dst_unclone(skb);
150 return &dst->u.tun_info;
153 static inline struct metadata_dst *__ip_tun_set_dst(__be32 saddr,
161 struct metadata_dst *tun_dst;
163 tun_dst = tun_rx_dst(md_size);
167 ip_tunnel_key_init(&tun_dst->u.tun_info.key,
168 saddr, daddr, tos, ttl,
169 0, 0, tp_dst, tunnel_id, flags);
173 static inline struct metadata_dst *ip_tun_rx_dst(struct sk_buff *skb,
178 const struct iphdr *iph = ip_hdr(skb);
180 return __ip_tun_set_dst(iph->saddr, iph->daddr, iph->tos, iph->ttl,
181 0, flags, tunnel_id, md_size);
184 static inline struct metadata_dst *__ipv6_tun_set_dst(const struct in6_addr *saddr,
185 const struct in6_addr *daddr,
193 struct metadata_dst *tun_dst;
194 struct ip_tunnel_info *info;
196 tun_dst = tun_rx_dst(md_size);
200 info = &tun_dst->u.tun_info;
201 info->mode = IP_TUNNEL_INFO_IPV6;
202 info->key.tun_flags = flags;
203 info->key.tun_id = tunnel_id;
204 info->key.tp_src = 0;
205 info->key.tp_dst = tp_dst;
207 info->key.u.ipv6.src = *saddr;
208 info->key.u.ipv6.dst = *daddr;
212 info->key.label = label;
217 static inline struct metadata_dst *ipv6_tun_rx_dst(struct sk_buff *skb,
222 const struct ipv6hdr *ip6h = ipv6_hdr(skb);
224 return __ipv6_tun_set_dst(&ip6h->saddr, &ip6h->daddr,
225 ipv6_get_dsfield(ip6h), ip6h->hop_limit,
226 0, ip6_flowlabel(ip6h), flags, tunnel_id,
229 #endif /* __NET_DST_METADATA_H */