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