nhrpd: fix dont consider incomplete L2 entry (backport #18078) #18112
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Sometimes, NHRP receives L2 information on a cache entry with the 0.0.0.0 IP address. NHRP considers it as valid and updates the binding with the new IP address. > Feb 09 20:09:54 aws-sin-vpn01 nhrpd[2695]: [QQ0NK-1H449] Netlink: new-neigh 10.2.114.238 dev dmvpn1 lladdr 162.251.180.10 nud 0x2 cache used 0 type 4 > Feb 09 20:10:35 aws-sin-vpn01 nhrpd[2695]: [QQ0NK-1H449] Netlink: new-neigh 10.2.114.238 dev dmvpn1 lladdr 162.251.180.10 nud 0x4 cache used 1 type 4 > Feb 09 20:10:48 aws-sin-vpn01 nhrpd[2695]: [QQ0NK-1H449] Netlink: del-neigh 10.2.114.238 dev dmvpn1 lladdr 162.251.180.10 nud 0x4 cache used 1 type 4 > Feb 09 20:10:49 aws-sin-vpn01 nhrpd[2695]: [QQ0NK-1H449] Netlink: who-has 10.2.114.238 dev dmvpn1 lladdr (unspec) nud 0x1 cache used 1 type 4 > Feb 09 20:10:49 aws-sin-vpn01 nhrpd[2695]: [QVXNM-NVHEQ] Netlink: update binding for 10.2.114.238 dev dmvpn1 from c 162.251.180.10 peer.vc.nbma 162.251.180.10 to lladdr (unspec) > Feb 09 20:10:49 aws-sin-vpn01 nhrpd[2695]: [QQ0NK-1H449] Netlink: new-neigh 10.2.114.238 dev dmvpn1 lladdr 0.0.0.0 nud 0x2 cache used 1 type 4 > Feb 09 20:11:30 aws-sin-vpn01 nhrpd[2695]: [QQ0NK-1H449] Netlink: new-neigh 10.2.114.238 dev dmvpn1 lladdr 0.0.0.0 nud 0x4 cache used 1 type 4 Actually, the 0.0.0.0 IP addressed mentiones in the 'who-has' message is wrong because the nud state value means that value is incomplete and should not be handled as a valid entry. Instead of considering it, fix this by by invalidating the current binding. This step is necessary in order to permit NHRP to trigger resolution requests again. Signed-off-by: Philippe Guibert <[email protected]> (cherry picked from commit 3202323)
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Sometimes, NHRP receives L2 information on a cache entry with the 0.0.0.0 IP address. NHRP considers it as valid and updates the binding with the new IP address.
Actually, the 0.0.0.0 IP addressed mentiones in the 'who-has' message is wrong because the nud state value means that value is incomplete and should not be handled as a valid entry. Instead of considering it, fix this by by invalidating the current binding. This step is necessary in order to permit NHRP to trigger resolution requests again.
This is an automatic backport of pull request #18078 done by Mergify.