diff options
Diffstat (limited to 'pimd/pim_pim.c')
| -rw-r--r-- | pimd/pim_pim.c | 38 |
1 files changed, 31 insertions, 7 deletions
diff --git a/pimd/pim_pim.c b/pimd/pim_pim.c index f727d3e627..840004c375 100644 --- a/pimd/pim_pim.c +++ b/pimd/pim_pim.c @@ -197,13 +197,37 @@ int pim_pim_packet(struct interface *ifp, uint8_t *buf, size_t len) /* for computing checksum */ *(uint16_t *) PIM_MSG_HDR_OFFSET_CHECKSUM(pim_msg) = 0; - checksum = in_cksum(pim_msg, pim_msg_len); - if (checksum != pim_checksum) { - if (PIM_DEBUG_PIM_PACKETS) - zlog_debug("Ignoring PIM pkt from %s with invalid checksum: received=%x calculated=%x", - ifp->name, pim_checksum, checksum); - return -1; - } + if (pim_type == PIM_MSG_TYPE_REGISTER) + { + /* First 8 byte header checksum */ + checksum = in_cksum (pim_msg, PIM_MSG_REGISTER_LEN); + if (checksum != pim_checksum) + { + checksum = in_cksum (pim_msg, pim_msg_len); + if (checksum != pim_checksum) + { + if (PIM_DEBUG_PIM_PACKETS) + zlog_debug + ("Ignoring PIM pkt from %s with invalid checksum: received=%x calculated=%x", + ifp->name, pim_checksum, checksum); + + return -1; + } + } + } + else + { + checksum = in_cksum (pim_msg, pim_msg_len); + if (checksum != pim_checksum) + { + if (PIM_DEBUG_PIM_PACKETS) + zlog_debug + ("Ignoring PIM pkt from %s with invalid checksum: received=%x calculated=%x", + ifp->name, pim_checksum, checksum); + + return -1; + } + } if (PIM_DEBUG_PIM_PACKETS) { pim_inet4_dump("<src?>", ip_hdr->ip_src, src_str, sizeof(src_str)); |