Function in_lltable_alloc

freebsd/netinet/in.c:1515–1559

}

static struct llentry *
in_lltable_alloc(struct lltable *llt, u_int flags, const struct sockaddr *l3addr)
{
	const struct sockaddr_in *sin = (const struct sockaddr_in *)l3addr;
	struct ifnet *ifp = llt->llt_ifp;
	struct llentry *lle;
	char linkhdr[LLE_MAX_LINKHDR];
	size_t linkhdrsize;
	int lladdr_off;

	KASSERT(l3addr->sa_family == AF_INET,
	    ("sin_family %d", l3addr->sa_family));

	/*
	 * A route that covers the given address must have
	 * been installed 1st because we are doing a resolution,
	 * verify this.
	 */
	if (!(flags & LLE_IFADDR) &&
	    in_lltable_rtcheck(ifp, flags, l3addr) != 0)
		return (NULL);

	lle = in_lltable_new(sin->sin_addr, flags);
	if (lle == NULL) {
		log(LOG_INFO, "lla_lookup: new lle malloc failed\n");
		return (NULL);
	}
	lle->la_flags = flags;
	if (flags & LLE_STATIC)
		lle->r_flags |= RLLE_VALID;
	if ((flags & LLE_IFADDR) == LLE_IFADDR) {
		linkhdrsize = LLE_MAX_LINKHDR;
		if (lltable_calc_llheader(ifp, AF_INET, IF_LLADDR(ifp),
		    linkhdr, &linkhdrsize, &lladdr_off) != 0) {
			NET_EPOCH_CALL(in_lltable_destroy_lle_unlocked, &lle->lle_epoch_ctx);
			return (NULL);
		}
		lltable_set_entry_addr(ifp, lle, linkhdr, linkhdrsize,
		    lladdr_off);
		lle->la_flags |= LLE_STATIC;
		lle->r_flags |= (RLLE_VALID | RLLE_IFADDR);
	}

	return (lle);
}

/*
 * Return NULL if not found or marked for deletion.