diff options
Diffstat (limited to 'lib/csum.c')
| -rw-r--r-- | lib/csum.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/lib/csum.c b/lib/csum.c index 6f044473e..922f68625 100644 --- a/lib/csum.c +++ b/lib/csum.c @@ -76,7 +76,10 @@ csum_continue(uint32_t partial, const void *data_, size_t n) uint16_t csum_finish(uint32_t partial) { - return ~((partial & 0xffff) + (partial >> 16)); + while (partial >> 16) { + partial = (partial & 0xffff) + (partial >> 16); + } + return ~partial; } /* Returns the new checksum for a packet in which the checksum field previously @@ -93,8 +96,7 @@ recalc_csum16(uint16_t old_csum, uint16_t old_u16, uint16_t new_u16) uint16_t m_complement = ~old_u16; uint16_t m_prime = new_u16; uint32_t sum = hc_complement + m_complement + m_prime; - uint16_t hc_prime_complement = sum + (sum >> 16); - return ~hc_prime_complement; + return csum_finish(sum); } /* Returns the new checksum for a packet in which the checksum field previously |