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52d0378645
This patch anticipates the support for the IOAM insertion inside in-transit packets, by making a difference between input and output in order to determine the right value for its hop-limit (inherited from the IPv6 hop-limit). Input case: happens before ip6_forward, the IPv6 hop-limit is not decremented yet -> decrement the IOAM hop-limit to reflect the new hop inside the trace. Output case: happens after ip6_forward, the IPv6 hop-limit has already been decremented -> keep the same value for the IOAM hop-limit. Signed-off-by: Justin Iurman <justin.iurman@uliege.be> Signed-off-by: David S. Miller <davem@davemloft.net>
68 lines
1.2 KiB
C
68 lines
1.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* IPv6 IOAM implementation
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*
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* Author:
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* Justin Iurman <justin.iurman@uliege.be>
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*/
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#ifndef _NET_IOAM6_H
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#define _NET_IOAM6_H
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#include <linux/net.h>
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#include <linux/ipv6.h>
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#include <linux/ioam6.h>
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#include <linux/rhashtable-types.h>
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struct ioam6_namespace {
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struct rhash_head head;
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struct rcu_head rcu;
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struct ioam6_schema __rcu *schema;
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__be16 id;
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__be32 data;
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__be64 data_wide;
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};
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struct ioam6_schema {
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struct rhash_head head;
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struct rcu_head rcu;
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struct ioam6_namespace __rcu *ns;
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u32 id;
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int len;
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__be32 hdr;
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u8 data[0];
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};
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struct ioam6_pernet_data {
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struct mutex lock;
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struct rhashtable namespaces;
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struct rhashtable schemas;
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};
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static inline struct ioam6_pernet_data *ioam6_pernet(struct net *net)
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{
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#if IS_ENABLED(CONFIG_IPV6)
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return net->ipv6.ioam6_data;
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#else
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return NULL;
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#endif
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}
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struct ioam6_namespace *ioam6_namespace(struct net *net, __be16 id);
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void ioam6_fill_trace_data(struct sk_buff *skb,
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struct ioam6_namespace *ns,
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struct ioam6_trace_hdr *trace,
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bool is_input);
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int ioam6_init(void);
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void ioam6_exit(void);
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int ioam6_iptunnel_init(void);
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void ioam6_iptunnel_exit(void);
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#endif /* _NET_IOAM6_H */
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