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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
f38a9eb1 TG |
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 | ||
3fcece12 JK |
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 | ||
f38a9eb1 TG |
19 | struct metadata_dst { |
20 | struct dst_entry dst; | |
3fcece12 | 21 | enum metadata_type type; |
ee122c79 TG |
22 | union { |
23 | struct ip_tunnel_info tun_info; | |
3fcece12 | 24 | struct hw_port_info port_info; |
ee122c79 | 25 | } u; |
f38a9eb1 TG |
26 | }; |
27 | ||
32f16369 | 28 | static inline struct metadata_dst *skb_metadata_dst(const struct sk_buff *skb) |
f38a9eb1 TG |
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 | ||
32f16369 SH |
38 | static inline struct ip_tunnel_info * |
39 | skb_tunnel_info(const struct sk_buff *skb) | |
ee122c79 TG |
40 | { |
41 | struct metadata_dst *md_dst = skb_metadata_dst(skb); | |
61adedf3 | 42 | struct dst_entry *dst; |
ee122c79 | 43 | |
3fcece12 | 44 | if (md_dst && md_dst->type == METADATA_IP_TUNNEL) |
ee122c79 TG |
45 | return &md_dst->u.tun_info; |
46 | ||
61adedf3 | 47 | dst = skb_dst(skb); |
40f9468a TY |
48 | if (dst && dst->lwtstate && |
49 | (dst->lwtstate->type == LWTUNNEL_ENCAP_IP || | |
50 | dst->lwtstate->type == LWTUNNEL_ENCAP_IP6)) | |
61adedf3 | 51 | return lwt_tun_info(dst->lwtstate); |
3093fbe7 | 52 | |
ee122c79 TG |
53 | return NULL; |
54 | } | |
55 | ||
f38a9eb1 TG |
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 | ||
ce87fc6c JG |
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 | ||
3fcece12 | 74 | if (!a != !b || a->type != b->type) |
ce87fc6c JG |
75 | return 1; |
76 | ||
3fcece12 JK |
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 | } | |
ce87fc6c JG |
88 | } |
89 | ||
d71785ff | 90 | void metadata_dst_free(struct metadata_dst *); |
3fcece12 JK |
91 | struct metadata_dst *metadata_dst_alloc(u8 optslen, enum metadata_type type, |
92 | gfp_t flags); | |
d66f2b91 | 93 | void metadata_dst_free_percpu(struct metadata_dst __percpu *md_dst); |
3fcece12 JK |
94 | struct metadata_dst __percpu * |
95 | metadata_dst_alloc_percpu(u8 optslen, enum metadata_type type, gfp_t flags); | |
f38a9eb1 | 96 | |
4c222798 | 97 | static inline struct metadata_dst *tun_rx_dst(int md_size) |
c29a70d2 PS |
98 | { |
99 | struct metadata_dst *tun_dst; | |
c29a70d2 | 100 | |
3fcece12 | 101 | tun_dst = metadata_dst_alloc(md_size, METADATA_IP_TUNNEL, GFP_ATOMIC); |
c29a70d2 PS |
102 | if (!tun_dst) |
103 | return NULL; | |
104 | ||
4c222798 PS |
105 | tun_dst->u.tun_info.options_len = 0; |
106 | tun_dst->u.tun_info.mode = 0; | |
c29a70d2 PS |
107 | return tun_dst; |
108 | } | |
109 | ||
fc4099f1 PS |
110 | static inline struct metadata_dst *tun_dst_unclone(struct sk_buff *skb) |
111 | { | |
112 | struct metadata_dst *md_dst = skb_metadata_dst(skb); | |
f63ce5b6 | 113 | int md_size; |
fc4099f1 PS |
114 | struct metadata_dst *new_md; |
115 | ||
3fcece12 | 116 | if (!md_dst || md_dst->type != METADATA_IP_TUNNEL) |
fc4099f1 PS |
117 | return ERR_PTR(-EINVAL); |
118 | ||
f63ce5b6 | 119 | md_size = md_dst->u.tun_info.options_len; |
3fcece12 | 120 | new_md = metadata_dst_alloc(md_size, METADATA_IP_TUNNEL, GFP_ATOMIC); |
fc4099f1 PS |
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); | |
ef0009af AT |
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 | ||
fc4099f1 | 139 | skb_dst_drop(skb); |
fc4099f1 PS |
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 | ||
2ff378b7 AV |
155 | static inline struct metadata_dst *__ip_tun_set_dst(__be32 saddr, |
156 | __be32 daddr, | |
157 | __u8 tos, __u8 ttl, | |
24ba898d | 158 | __be16 tp_dst, |
2ff378b7 AV |
159 | __be16 flags, |
160 | __be64 tunnel_id, | |
161 | int md_size) | |
c29a70d2 | 162 | { |
c29a70d2 | 163 | struct metadata_dst *tun_dst; |
c29a70d2 | 164 | |
4c222798 | 165 | tun_dst = tun_rx_dst(md_size); |
c29a70d2 PS |
166 | if (!tun_dst) |
167 | return NULL; | |
168 | ||
4c222798 | 169 | ip_tunnel_key_init(&tun_dst->u.tun_info.key, |
2ff378b7 | 170 | saddr, daddr, tos, ttl, |
24ba898d | 171 | 0, 0, tp_dst, tunnel_id, flags); |
c29a70d2 PS |
172 | return tun_dst; |
173 | } | |
174 | ||
2ff378b7 | 175 | static inline struct metadata_dst *ip_tun_rx_dst(struct sk_buff *skb, |
c29a70d2 PS |
176 | __be16 flags, |
177 | __be64 tunnel_id, | |
178 | int md_size) | |
179 | { | |
2ff378b7 AV |
180 | const struct iphdr *iph = ip_hdr(skb); |
181 | ||
182 | return __ip_tun_set_dst(iph->saddr, iph->daddr, iph->tos, iph->ttl, | |
24ba898d | 183 | 0, flags, tunnel_id, md_size); |
2ff378b7 AV |
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, | |
24ba898d | 189 | __be16 tp_dst, |
2ff378b7 AV |
190 | __be32 label, |
191 | __be16 flags, | |
192 | __be64 tunnel_id, | |
193 | int md_size) | |
194 | { | |
c29a70d2 PS |
195 | struct metadata_dst *tun_dst; |
196 | struct ip_tunnel_info *info; | |
197 | ||
4c222798 | 198 | tun_dst = tun_rx_dst(md_size); |
c29a70d2 PS |
199 | if (!tun_dst) |
200 | return NULL; | |
201 | ||
202 | info = &tun_dst->u.tun_info; | |
4c222798 PS |
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; | |
24ba898d | 207 | info->key.tp_dst = tp_dst; |
4c222798 | 208 | |
2ff378b7 AV |
209 | info->key.u.ipv6.src = *saddr; |
210 | info->key.u.ipv6.dst = *daddr; | |
13461144 | 211 | |
2ff378b7 AV |
212 | info->key.tos = tos; |
213 | info->key.ttl = ttl; | |
214 | info->key.label = label; | |
13461144 | 215 | |
c29a70d2 PS |
216 | return tun_dst; |
217 | } | |
218 | ||
2ff378b7 AV |
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, | |
24ba898d | 228 | 0, ip6_flowlabel(ip6h), flags, tunnel_id, |
2ff378b7 AV |
229 | md_size); |
230 | } | |
f38a9eb1 | 231 | #endif /* __NET_DST_METADATA_H */ |