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authorThomas Graf <tgraf@suug.ch>2015-07-21 11:43:56 +0300
committerDavid S. Miller <davem@davemloft.net>2015-07-21 20:39:05 +0300
commitf38a9eb1f77b296ff07e000823884a0f64d67b2a (patch)
treef1404a06ffc6ce0f2bfc8a24e12a1faa7bc0db57 /include/net/dst_metadata.h
parent773a69d64bf65eb6c212c97e9737963a2cf668fd (diff)
downloadlinux-f38a9eb1f77b296ff07e000823884a0f64d67b2a.tar.xz
dst: Metadata destinations
Introduces a new dst_metadata which enables to carry per packet metadata between forwarding and processing elements via the skb->dst pointer. The structure is set up to be a union. Thus, each separate type of metadata requires its own dst instance. If demand arises to carry multiple types of metadata concurrently, metadata dst entries can be made stackable. The metadata dst entry is refcnt'ed as expected for now but a non reference counted use is possible if the reference is forced before queueing the skb. In order to allow allocating dsts with variable length, the existing dst_alloc() is split into a dst_alloc() and dst_init() function. The existing dst_init() function to initialize the subsystem is being renamed to dst_subsys_init() to make it clear what is what. The check before ip_route_input() is changed to ignore metadata dsts and drop the dst inside the routing function thus allowing to interpret metadata in a later commit. Signed-off-by: Thomas Graf <tgraf@suug.ch> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/net/dst_metadata.h')
-rw-r--r--include/net/dst_metadata.h32
1 files changed, 32 insertions, 0 deletions
diff --git a/include/net/dst_metadata.h b/include/net/dst_metadata.h
new file mode 100644
index 000000000000..4f7694f3c7d0
--- /dev/null
+++ b/include/net/dst_metadata.h
@@ -0,0 +1,32 @@
+#ifndef __NET_DST_METADATA_H
+#define __NET_DST_METADATA_H 1
+
+#include <linux/skbuff.h>
+#include <net/ip_tunnels.h>
+#include <net/dst.h>
+
+struct metadata_dst {
+ struct dst_entry dst;
+ size_t opts_len;
+};
+
+static inline struct metadata_dst *skb_metadata_dst(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 bool skb_valid_dst(const struct sk_buff *skb)
+{
+ struct dst_entry *dst = skb_dst(skb);
+
+ return dst && !(dst->flags & DST_METADATA);
+}
+
+struct metadata_dst *metadata_dst_alloc(u8 optslen, gfp_t flags);
+
+#endif /* __NET_DST_METADATA_H */