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