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icmp: introduce helper for nat'd source address in network device context

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This introduces a helper function to be called only by network drivers
that wraps calls to icmp[v6]_send in a conntrack transformation, in case
NAT has been used. We don't want to pollute the non-driver path, though,
so we introduce this as a helper to be called by places that actually
make use of this, as suggested by Florian.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Cc: Florian Westphal <fw@strlen.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jason A. Donenfeld 2020-02-11 20:47:05 +01:00 • committed by David S. Miller
parent 07134cf696
commit 0b41713b60
4 changed files with 79 additions and 0 deletions
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6
include/linux/icmpv6.h
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@ -31,6 +31,12 @@ static inline void icmpv6_send(struct sk_buff *skb,
}
#endif
#if IS_ENABLED(CONFIG_NF_NAT)
void icmpv6_ndo_send(struct sk_buff *skb_in, u8 type, u8 code, __u32 info);
#else
#define icmpv6_ndo_send icmpv6_send
#endif
extern int icmpv6_init(void);
extern int icmpv6_err_convert(u8 type, u8 code,
int *err);