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Alexander V. Chernikov d187154750 netlink: use custom uma zone for the mbuf storage.
Netlink communicates with userland via sockets, utilising
 MCLBYTES-sized mbufs to append data to the socket buffers.
These mbufs are never transmitted via logical or physical network.

It may be possible that the 2k mbuf zone is temporary exhausted
 due to the DDoS-style traffic, leading to Netlink failure to
 respond to the requests.

To address it, this change introduces a custom Netlink-specific
 zone for the mbuf storage. It has the following benefits:
* no precious memory from UMA_ZONE_CONTIG zones is utilized for Netlink
* Netlink becomes (more) independent from the traffic spikes and
 other related network "corner" conditions.
* Netlink allocations are now isolated within a specific zone, making it
 easier to track Netlink mbuf usage and attribute mbufs.

Reviewed by:	gallatin, adrian
Differential Revision:
MFC after:	2 weeks
2 hours ago
contrib pf: make contents of struct pfsync_state configurable 2 days ago
crypto OpenSSL: Merge OpenSSL 1.1.1u 2 days ago
lib libunbound: Request the OpenSSL 1.1 API 18 hours ago
sbin decryptcore: add OPENSSL_INIT_LOAD_CONFIG to init call 16 hours ago
secure OpenSSL: Merge OpenSSL 1.1.1u 2 days ago
share pmc: Initialise and check the pm_flags field for CONFIGURELOG 1 day ago
sys netlink: use custom uma zone for the mbuf storage. 2 hours ago
tests netinet*: Fix redirects for connections from localhost 22 hours ago
tools genl: add new command to list genetlink(4) 2 days ago
usr.bin split(1): add '-c' to continue creating files 2 days ago
usr.sbin unbound: avoid calling deprecated OpenSSL function 1 day ago
.cirrus.yml Cirrus-CI: add amd64 and arm64 Clang/LLVM 16 jobs 2 days ago

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