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authorPeter Oskolkov <posk@google.com>2018-09-21 21:17:16 +0300
committerDavid S. Miller <davem@davemloft.net>2018-09-22 05:45:52 +0300
commit83619623929815a76fa7af49309d2cdfcf024fd3 (patch)
tree1ce822c70eb3189659e60bea091b251d54da7140 /net/ieee802154
parent2475f59c618ea58e9f72ae5ded2db392ee47810d (diff)
downloadlinux-83619623929815a76fa7af49309d2cdfcf024fd3.tar.xz
net/ipfrag: let ip[6]frag_high_thresh in ns be higher than in init_net
Currently, ip[6]frag_high_thresh sysctl values in new namespaces are hard-limited to those of the root/init ns. There are at least two use cases when it would be desirable to set the high_thresh values higher in a child namespace vs the global hard limit: - a security/ddos protection policy may lower the thresholds in the root/init ns but allow for a special exception in a child namespace - testing: a test running in a namespace may want to set these thresholds higher in its namespace than what is in the root/init ns The new behavior: # ip netns add testns # ip netns exec testns bash # sysctl -w net.ipv4.ipfrag_high_thresh=9000000 net.ipv4.ipfrag_high_thresh = 9000000 # sysctl net.ipv4.ipfrag_high_thresh net.ipv4.ipfrag_high_thresh = 9000000 # sysctl -w net.ipv6.ip6frag_high_thresh=9000000 net.ipv6.ip6frag_high_thresh = 9000000 # sysctl net.ipv6.ip6frag_high_thresh net.ipv6.ip6frag_high_thresh = 9000000 The old behavior: # ip netns add testns # ip netns exec testns bash # sysctl -w net.ipv4.ipfrag_high_thresh=9000000 net.ipv4.ipfrag_high_thresh = 9000000 # sysctl net.ipv4.ipfrag_high_thresh net.ipv4.ipfrag_high_thresh = 4194304 # sysctl -w net.ipv6.ip6frag_high_thresh=9000000 net.ipv6.ip6frag_high_thresh = 9000000 # sysctl net.ipv6.ip6frag_high_thresh net.ipv6.ip6frag_high_thresh = 4194304 Signed-off-by: Peter Oskolkov <posk@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ieee802154')
-rw-r--r--net/ieee802154/6lowpan/reassembly.c1
1 files changed, 0 insertions, 1 deletions
diff --git a/net/ieee802154/6lowpan/reassembly.c b/net/ieee802154/6lowpan/reassembly.c
index 09ffbf5ce8fa..d14226ecfde4 100644
--- a/net/ieee802154/6lowpan/reassembly.c
+++ b/net/ieee802154/6lowpan/reassembly.c
@@ -463,7 +463,6 @@ static int __net_init lowpan_frags_ns_sysctl_register(struct net *net)
table[0].data = &ieee802154_lowpan->frags.high_thresh;
table[0].extra1 = &ieee802154_lowpan->frags.low_thresh;
- table[0].extra2 = &init_net.ieee802154_lowpan.frags.high_thresh;
table[1].data = &ieee802154_lowpan->frags.low_thresh;
table[1].extra2 = &ieee802154_lowpan->frags.high_thresh;
table[2].data = &ieee802154_lowpan->frags.timeout;