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c29a70d2ca
Introduce function udp_tun_rx_dst() to initialize tunnel dst on receive path. Signed-off-by: Pravin B Shelar <pshelar@nicira.com> Reviewed-by: Jesse Gross <jesse@nicira.com> Acked-by: Thomas Graf <tgraf@suug.ch> Signed-off-by: David S. Miller <davem@davemloft.net>
112 lines
2.5 KiB
C
112 lines
2.5 KiB
C
#ifndef __NET_DST_METADATA_H
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#define __NET_DST_METADATA_H 1
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#include <linux/skbuff.h>
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#include <net/ip_tunnels.h>
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#include <net/dst.h>
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struct metadata_dst {
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struct dst_entry dst;
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size_t opts_len;
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union {
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struct ip_tunnel_info tun_info;
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} u;
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};
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static inline struct metadata_dst *skb_metadata_dst(struct sk_buff *skb)
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{
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struct metadata_dst *md_dst = (struct metadata_dst *) skb_dst(skb);
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if (md_dst && md_dst->dst.flags & DST_METADATA)
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return md_dst;
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return NULL;
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}
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static inline struct ip_tunnel_info *skb_tunnel_info(struct sk_buff *skb)
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{
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struct metadata_dst *md_dst = skb_metadata_dst(skb);
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struct dst_entry *dst;
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if (md_dst)
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return &md_dst->u.tun_info;
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dst = skb_dst(skb);
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if (dst && dst->lwtstate)
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return lwt_tun_info(dst->lwtstate);
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return NULL;
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}
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static inline bool skb_valid_dst(const struct sk_buff *skb)
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{
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struct dst_entry *dst = skb_dst(skb);
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return dst && !(dst->flags & DST_METADATA);
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}
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struct metadata_dst *metadata_dst_alloc(u8 optslen, gfp_t flags);
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struct metadata_dst __percpu *metadata_dst_alloc_percpu(u8 optslen, gfp_t flags);
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static inline struct metadata_dst *tun_rx_dst(__be16 flags,
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__be64 tunnel_id, int md_size)
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{
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struct metadata_dst *tun_dst;
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struct ip_tunnel_info *info;
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tun_dst = metadata_dst_alloc(md_size, GFP_ATOMIC);
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if (!tun_dst)
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return NULL;
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info = &tun_dst->u.tun_info;
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info->mode = IP_TUNNEL_INFO_RX;
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info->key.tun_flags = flags;
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info->key.tun_id = tunnel_id;
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info->key.tp_src = 0;
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info->key.tp_dst = 0;
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return tun_dst;
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}
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static inline struct metadata_dst *ip_tun_rx_dst(struct sk_buff *skb,
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__be16 flags,
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__be64 tunnel_id,
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int md_size)
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{
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const struct iphdr *iph = ip_hdr(skb);
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struct metadata_dst *tun_dst;
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struct ip_tunnel_info *info;
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tun_dst = tun_rx_dst(flags, tunnel_id, md_size);
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if (!tun_dst)
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return NULL;
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info = &tun_dst->u.tun_info;
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info->key.u.ipv4.src = iph->saddr;
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info->key.u.ipv4.dst = iph->daddr;
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info->key.tos = iph->tos;
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info->key.ttl = iph->ttl;
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return tun_dst;
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}
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static inline struct metadata_dst *ipv6_tun_rx_dst(struct sk_buff *skb,
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__be16 flags,
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__be64 tunnel_id,
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int md_size)
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{
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const struct ipv6hdr *ip6h = ipv6_hdr(skb);
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struct metadata_dst *tun_dst;
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struct ip_tunnel_info *info;
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tun_dst = tun_rx_dst(flags, tunnel_id, md_size);
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if (!tun_dst)
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return NULL;
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info = &tun_dst->u.tun_info;
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info->key.u.ipv6.src = ip6h->saddr;
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info->key.u.ipv6.dst = ip6h->daddr;
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info->key.tos = ipv6_get_dsfield(ip6h);
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info->key.ttl = ip6h->hop_limit;
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return tun_dst;
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}
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#endif /* __NET_DST_METADATA_H */
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