diff options
Diffstat (limited to 'src/vnet/ethernet/arp.c')
| -rw-r--r-- | src/vnet/ethernet/arp.c | 44 |
1 files changed, 23 insertions, 21 deletions
diff --git a/src/vnet/ethernet/arp.c b/src/vnet/ethernet/arp.c index 75c7e20372a..2f81da32400 100644 --- a/src/vnet/ethernet/arp.c +++ b/src/vnet/ethernet/arp.c @@ -479,28 +479,30 @@ arp_update_adjacency (vnet_main_t * vnm, u32 sw_if_index, u32 ai) } break; case IP_LOOKUP_NEXT_MCAST: - /* - * Construct a partial rewrite from the known ethernet mcast dest MAC - */ - adj_mcast_update_rewrite - (ai, - ethernet_build_rewrite (vnm, - sw_if_index, - adj->ia_link, - ethernet_ip4_mcast_dst_addr ())); - - /* - * Complete the remaining fields of the adj's rewrite to direct the - * complete of the rewrite at switch time by copying in the IP - * dst address's bytes. - * Ofset is 11 bytes from the end of the MAC header - which is three - * bytes into the desintation address. And we write 3 bytes. - */ - adj->rewrite_header.dst_mcast_offset = 11; - adj->rewrite_header.dst_mcast_n_bytes = 3; - - break; + { + /* + * Construct a partial rewrite from the known ethernet mcast dest MAC + */ + u8 *rewrite; + u8 offset; + + rewrite = ethernet_build_rewrite (vnm, + sw_if_index, + adj->ia_link, + ethernet_ip4_mcast_dst_addr ()); + offset = vec_len (rewrite) - 2; + + /* + * Complete the remaining fields of the adj's rewrite to direct the + * complete of the rewrite at switch time by copying in the IP + * dst address's bytes. + * Ofset is 2 bytes into the MAC desintation address. And we copy 23 bits + * from the address. + */ + adj_mcast_update_rewrite (ai, rewrite, offset, 0x007fffff); + break; + } case IP_LOOKUP_NEXT_DROP: case IP_LOOKUP_NEXT_PUNT: case IP_LOOKUP_NEXT_LOCAL: |