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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel os linux
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#include <linux/skbuff.h>#include <net/ip.h>#include <net/ip_tunnels.h>#include <net/macsec.h>#include <net/dst.h>
enum metadata_type { METADATA_IP_TUNNEL, METADATA_HW_PORT_MUX, METADATA_MACSEC, METADATA_XFRM,};
struct hw_port_info { struct net_device *lower_dev; u32 port_id;};
struct macsec_info { sci_t sci;};
struct xfrm_md_info { u32 if_id; int link; struct dst_entry *dst_orig;};
struct metadata_dst { struct dst_entry dst; enum metadata_type type; union { struct ip_tunnel_info tun_info; struct hw_port_info port_info; struct macsec_info macsec_info; struct xfrm_md_info xfrm_info; } u;};
static inline struct metadata_dst *skb_metadata_dst(const struct sk_buff *skb){ struct metadata_dst *md_dst = (struct metadata_dst *) skb_dst(skb);
if (md_dst && md_dst->dst.flags & DST_METADATA) return md_dst;
return NULL;}
static inline struct ip_tunnel_info *skb_tunnel_info(const struct sk_buff *skb){ struct metadata_dst *md_dst = skb_metadata_dst(skb); struct dst_entry *dst;
if (md_dst && md_dst->type == METADATA_IP_TUNNEL) return &md_dst->u.tun_info;
dst = skb_dst(skb); if (dst && dst->lwtstate && (dst->lwtstate->type == LWTUNNEL_ENCAP_IP || dst->lwtstate->type == LWTUNNEL_ENCAP_IP6)) return lwt_tun_info(dst->lwtstate);
return NULL;}
static inline struct xfrm_md_info *lwt_xfrm_info(struct lwtunnel_state *lwt){ return (struct xfrm_md_info *)lwt->data;}
static inline struct xfrm_md_info *skb_xfrm_md_info(const struct sk_buff *skb){ struct metadata_dst *md_dst = skb_metadata_dst(skb); struct dst_entry *dst;
if (md_dst && md_dst->type == METADATA_XFRM) return &md_dst->u.xfrm_info;
dst = skb_dst(skb); if (dst && dst->lwtstate && dst->lwtstate->type == LWTUNNEL_ENCAP_XFRM) return lwt_xfrm_info(dst->lwtstate);
return NULL;}
static inline bool skb_valid_dst(const struct sk_buff *skb){ struct dst_entry *dst = skb_dst(skb);
return dst && !(dst->flags & DST_METADATA);}
static inline int skb_metadata_dst_cmp(const struct sk_buff *skb_a, const struct sk_buff *skb_b){ const struct metadata_dst *a, *b;
if (!(skb_a->_skb_refdst | skb_b->_skb_refdst)) return 0;
a = (const struct metadata_dst *) skb_dst(skb_a); b = (const struct metadata_dst *) skb_dst(skb_b);
if (!a != !b || a->type != b->type) return 1;
switch (a->type) { case METADATA_HW_PORT_MUX: return memcmp(&a->u.port_info, &b->u.port_info, sizeof(a->u.port_info)); case METADATA_IP_TUNNEL: return memcmp(&a->u.tun_info, &b->u.tun_info, sizeof(a->u.tun_info) + a->u.tun_info.options_len); case METADATA_MACSEC: return memcmp(&a->u.macsec_info, &b->u.macsec_info, sizeof(a->u.macsec_info)); case METADATA_XFRM: return memcmp(&a->u.xfrm_info, &b->u.xfrm_info, sizeof(a->u.xfrm_info)); default: return 1; }}
void metadata_dst_free(struct metadata_dst *);struct metadata_dst *metadata_dst_alloc(u8 optslen, enum metadata_type type, gfp_t flags);void metadata_dst_free_percpu(struct metadata_dst __percpu *md_dst);struct metadata_dst __percpu *metadata_dst_alloc_percpu(u8 optslen, enum metadata_type type, gfp_t flags);
static inline struct metadata_dst *tun_rx_dst(int md_size){ struct metadata_dst *tun_dst;
tun_dst = metadata_dst_alloc(md_size, METADATA_IP_TUNNEL, GFP_ATOMIC); if (!tun_dst) return NULL;
tun_dst->u.tun_info.options_len = 0; tun_dst->u.tun_info.mode = 0; return tun_dst;}
static inline struct metadata_dst *tun_dst_unclone(struct sk_buff *skb){ struct metadata_dst *md_dst = skb_metadata_dst(skb); int md_size; struct metadata_dst *new_md;
if (!md_dst || md_dst->type != METADATA_IP_TUNNEL) return ERR_PTR(-EINVAL);
md_size = md_dst->u.tun_info.options_len; new_md = metadata_dst_alloc(md_size, METADATA_IP_TUNNEL, GFP_ATOMIC); if (!new_md) return ERR_PTR(-ENOMEM);
/* Copy in two stages to keep the __counted_by happy. */ new_md->u.tun_info = md_dst->u.tun_info; memcpy(ip_tunnel_info_opts(&new_md->u.tun_info), ip_tunnel_info_opts(&md_dst->u.tun_info), md_size);
#ifdef CONFIG_DST_CACHE /* Unclone the dst cache if there is one */ if (new_md->u.tun_info.dst_cache.cache) { int ret;
ret = dst_cache_init(&new_md->u.tun_info.dst_cache, GFP_ATOMIC); if (ret) { metadata_dst_free(new_md); return ERR_PTR(ret); } }#endif
skb_dst_drop(skb); skb_dst_set(skb, &new_md->dst); return new_md;}
static inline struct ip_tunnel_info *skb_tunnel_info_unclone(struct sk_buff *skb){ struct metadata_dst *dst;
dst = tun_dst_unclone(skb); if (IS_ERR(dst)) return NULL;
return &dst->u.tun_info;}
static inline struct metadata_dst *__ip_tun_set_dst(__be32 saddr, __be32 daddr, __u8 tos, __u8 ttl, __be16 tp_dst, const unsigned long *flags, __be64 tunnel_id, int md_size){ struct metadata_dst *tun_dst;
tun_dst = tun_rx_dst(md_size); if (!tun_dst) return NULL;
ip_tunnel_key_init(&tun_dst->u.tun_info.key, saddr, daddr, tos, ttl, 0, 0, tp_dst, tunnel_id, flags); return tun_dst;}
static inline struct metadata_dst *ip_tun_rx_dst(struct sk_buff *skb, const unsigned long *flags, __be64 tunnel_id, int md_size){ const struct iphdr *iph = ip_hdr(skb); struct metadata_dst *tun_dst;
tun_dst = __ip_tun_set_dst(iph->saddr, iph->daddr, iph->tos, iph->ttl, 0, flags, tunnel_id, md_size);
if (tun_dst && (iph->frag_off & htons(IP_DF))) __set_bit(IP_TUNNEL_DONT_FRAGMENT_BIT, tun_dst->u.tun_info.key.tun_flags); return tun_dst;}
static inline struct metadata_dst *__ipv6_tun_set_dst(const struct in6_addr *saddr, const struct in6_addr *daddr, __u8 tos, __u8 ttl, __be16 tp_dst, __be32 label, const unsigned long *flags, __be64 tunnel_id, int md_size){ struct metadata_dst *tun_dst; struct ip_tunnel_info *info;
tun_dst = tun_rx_dst(md_size); if (!tun_dst) return NULL;
info = &tun_dst->u.tun_info; info->mode = IP_TUNNEL_INFO_IPV6; ip_tunnel_flags_copy(info->key.tun_flags, flags); info->key.tun_id = tunnel_id; info->key.tp_src = 0; info->key.tp_dst = tp_dst;
info->key.u.ipv6.src = *saddr; info->key.u.ipv6.dst = *daddr;
info->key.tos = tos; info->key.ttl = ttl; info->key.label = label;
return tun_dst;}
static inline struct metadata_dst *ipv6_tun_rx_dst(struct sk_buff *skb, const unsigned long *flags, __be64 tunnel_id, int md_size){ const struct ipv6hdr *ip6h = ipv6_hdr(skb);
return __ipv6_tun_set_dst(&ip6h->saddr, &ip6h->daddr, ipv6_get_dsfield(ip6h), ip6h->hop_limit, 0, ip6_flowlabel(ip6h), flags, tunnel_id, md_size);}#endif /* __NET_DST_METADATA_H */