Function pf_change_a

freebsd/netpfil/pf/pf.c:2245–2254

Changes a u_int32_t. Uses a void * so there are no align restrictions */

/* Changes a u_int32_t.  Uses a void * so there are no align restrictions */
void
pf_change_a(void *a, u_int16_t *c, u_int32_t an, u_int8_t u)
{
	u_int32_t	ao;

	memcpy(&ao, a, sizeof(ao));
	memcpy(a, &an, sizeof(u_int32_t));
	*c = pf_cksum_fixup(pf_cksum_fixup(*c, ao / 65536, an / 65536, u),
	    ao % 65536, an % 65536, u);
}

void
pf_change_proto_a(struct mbuf *m, void *a, u_int16_t *c, u_int32_t an, u_int8_t udp)