PF_LO
pf_patch_8(pd, &icmp6->icmp6_code, code, PF_LO);
pf_patch_8(pd, &icmp4->icmp_code, code, PF_LO);
pf_patch_8(pd, &th->th_flags, flags, PF_LO);
#define PF_ALGNMNT(off) (((off) % 2) == 0 ? PF_HI : PF_LO)