D28639.1779344977.diff
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D28639.1779344977.diff
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	diff --git a/sys/net/if.c b/sys/net/if.c
	--- a/sys/net/if.c
	+++ b/sys/net/if.c
	@@ -1857,8 +1857,18 @@
	void
	ifa_ref(struct ifaddr *ifa)
	{
	+ u_int old;

	- refcount_acquire(&ifa->ifa_refcnt);
	+ old = refcount_acquire(&ifa->ifa_refcnt);
	+ KASSERT(old > 0, ("%s: ifa %p has 0 refs", __func__, ifa));
	+}
	+
	+int
	+ifa_try_ref(struct ifaddr *ifa)
	+{
	+
	+ NET_EPOCH_ASSERT();
	+ return (refcount_acquire_if_not_zero(&ifa->ifa_refcnt));
	}

	static void
	diff --git a/sys/net/if_var.h b/sys/net/if_var.h
	--- a/sys/net/if_var.h
	+++ b/sys/net/if_var.h
	@@ -577,6 +577,7 @@
	struct ifaddr * ifa_alloc(size_t size, int flags);
	void ifa_free(struct ifaddr *ifa);
	void ifa_ref(struct ifaddr *ifa);
	+int ifa_try_ref(struct ifaddr *ifa);

	/*
	* Multicast address structure. This is analogous to the ifaddr