mirror of
https://github.com/torvalds/linux
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5f5624cf15
Following patch adds icmp-registration module for ipv6. It allows ipv6 protocol to register icmp_sender which is used for sending ipv6 icmp msgs. This extra layer allows us to kill ipv6 dependency for sending icmp packets. This patch also fixes ip_tunnel compilation problem when ip_tunnel is statically compiled in kernel but ipv6 is module Signed-off-by: Pravin B Shelar <pshelar@nicira.com> Acked-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
47 lines
939 B
C
47 lines
939 B
C
#include <linux/export.h>
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#include <linux/icmpv6.h>
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#include <linux/mutex.h>
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#include <linux/netdevice.h>
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#include <linux/spinlock.h>
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#include <net/ipv6.h>
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#if IS_ENABLED(CONFIG_IPV6)
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static ip6_icmp_send_t __rcu *ip6_icmp_send;
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int inet6_register_icmp_sender(ip6_icmp_send_t *fn)
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{
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return (cmpxchg((ip6_icmp_send_t **)&ip6_icmp_send, NULL, fn) == NULL) ?
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0 : -EBUSY;
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}
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EXPORT_SYMBOL(inet6_register_icmp_sender);
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int inet6_unregister_icmp_sender(ip6_icmp_send_t *fn)
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{
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int ret;
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ret = (cmpxchg((ip6_icmp_send_t **)&ip6_icmp_send, fn, NULL) == fn) ?
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0 : -EINVAL;
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synchronize_net();
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return ret;
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}
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EXPORT_SYMBOL(inet6_unregister_icmp_sender);
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void icmpv6_send(struct sk_buff *skb, u8 type, u8 code, __u32 info)
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{
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ip6_icmp_send_t *send;
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rcu_read_lock();
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send = rcu_dereference(ip6_icmp_send);
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if (!send)
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goto out;
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send(skb, type, code, info);
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out:
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rcu_read_unlock();
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}
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EXPORT_SYMBOL(icmpv6_send);
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#endif
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