include/net/dst_metadata.h

   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
   8 enum metadata_type {
   9         METADATA_IP_TUNNEL,
  10         METADATA_HW_PORT_MUX,
  11 };
  12
  13 struct hw_port_info {
  14         struct net_device *lower_dev;
  15         u32 port_id;
  16 };
  17
  18 struct 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
  27 static 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
  37 static 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
  52 static 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
  59 static 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
  86 void metadata_dst_free(struct metadata_dst *);
  87 struct metadata_dst *metadata_dst_alloc(u8 optslen, enum metadata_type type,
  88                                         gfp_t flags);
  89 struct metadata_dst __percpu *
  90 metadata_dst_alloc_percpu(u8 optslen, enum metadata_type type, gfp_t flags);
  91
  92 static 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
 105 static 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
 127 static 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
 138 static 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
 158 static 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
 169 static 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
 202 static 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 /* __NET_DST_METADATA_H */