diff options
Diffstat (limited to 'lib/packets.c')
| -rw-r--r-- | lib/packets.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/lib/packets.c b/lib/packets.c index 07cf2eb24..419c6af49 100644 --- a/lib/packets.c +++ b/lib/packets.c @@ -1043,3 +1043,17 @@ compose_arp(struct dp_packet *b, const uint8_t eth_src[ETH_ADDR_LEN], dp_packet_set_frame(b, eth); dp_packet_set_l3(b, arp); } + +uint32_t +packet_csum_pseudoheader(const struct ip_header *ip) +{ + uint32_t partial = 0; + + partial = csum_add32(partial, get_16aligned_be32(&ip->ip_src)); + partial = csum_add32(partial, get_16aligned_be32(&ip->ip_dst)); + partial = csum_add16(partial, htons(ip->ip_proto)); + partial = csum_add16(partial, htons(ntohs(ip->ip_tot_len) - + IP_IHL(ip->ip_ihl_ver) * 4)); + + return partial; +} |