Pablo Neira Ayuso c05cdb1b86 netlink: allow large data transfers from user-space ... I can hit ENOBUFS in the sendmsg() path with a large batch that is composed of many netlink messages. Here that limit is 8 MBytes of skbuff data area as kmalloc does not manage to get more than that. While discussing atomic rule-set for nftables with Patrick McHardy, we decided to put all rule-set updates that need to be applied atomically in one single batch to simplify the existing approach. However, as explained above, the existing netlink code limits us to a maximum of ~20000 rules that fit in one single batch without hitting ENOBUFS. iptables does not have such limitation as it is using vmalloc. This patch adds netlink_alloc_large_skb() which is only used in the netlink_sendmsg() path. It uses alloc_skb if the memory requested is <= one memory page, that should be the common case for most subsystems, else vmalloc for higher memory allocations. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org> Signed-off-by: David S. Miller <davem@davemloft.net>		2013-06-07 16:26:34 -07:00
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af_netlink.c	netlink: allow large data transfers from user-space	2013-06-07 16:26:34 -07:00
af_netlink.h	netlink: mmaped netlink: ring setup	2013-04-19 14:57:57 -04:00
diag.c	netlink: Fix build with mmap disabled.	2013-04-23 15:39:03 -04:00
genetlink.c	genetlink: fix possible memory leak in genl_family_rcv_msg()	2013-04-26 23:25:39 -04:00
Kconfig	netlink: kconfig: move mmap i/o into netlink kconfig	2013-05-01 15:02:42 -04:00
Makefile	netlink: Diag core and basic socket info dumping (v2)	2013-03-21 12:38:03 -04:00