| 451 | } |
| 452 | |
| 453 | static __inline uint16_t |
| 454 | gre_cksum_add(uint16_t sum, uint16_t a) |
| 455 | { |
| 456 | uint16_t res; |
| 457 | |
| 458 | res = sum + a; |
| 459 | return (res + (res < a)); |
| 460 | } |
| 461 | |
| 462 | void |
| 463 | gre_update_udphdr(struct gre_softc *sc, struct udphdr *udp, uint16_t csum) |