Eric Dumazet 3fb07daff8 ipv4: add reference counting to metrics ... Andrey Konovalov reported crashes in ipv4_mtu() I could reproduce the issue with KASAN kernels, between 10.246.7.151 and 10.246.7.152 : 1) 20 concurrent netperf -t TCP_RR -H 10.246.7.152 -l 1000 & 2) At the same time run following loop : while : do ip ro add 10.246.7.152 dev eth0 src 10.246.7.151 mtu 1500 ip ro del 10.246.7.152 dev eth0 src 10.246.7.151 mtu 1500 done Cong Wang attempted to add back rt->fi in commit 82486aa6f1 ("ipv4: restore rt->fi for reference counting") but this proved to add some issues that were complex to solve. Instead, I suggested to add a refcount to the metrics themselves, being a standalone object (in particular, no reference to other objects) I tried to make this patch as small as possible to ease its backport, instead of being super clean. Note that we believe that only ipv4 dst need to take care of the metric refcount. But if this is wrong, this patch adds the basic infrastructure to extend this to other families. Many thanks to Julian Anastasov for reviewing this patch, and Cong Wang for his efforts on this problem. Fixes: 2860583fe8 ("ipv4: Kill rt->fi") Signed-off-by: Eric Dumazet <edumazet@google.com> Reported-by: Andrey Konovalov <andreyknvl@google.com> Reviewed-by: Julian Anastasov <ja@ssi.bg> Acked-by: Cong Wang <xiyou.wangcong@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>		2017-05-26 14:57:07 -04:00
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Makefile	…
datagram.c	…
dev.c	xdp: refine xdp api with regards to generic xdp	2017-05-11 21:30:57 -04:00
dev_addr_lists.c	…
dev_ioctl.c	…
devlink.c	…
drop_monitor.c	…
dst.c	ipv4: add reference counting to metrics	2017-05-26 14:57:07 -04:00
dst_cache.c	…
ethtool.c	…
fib_rules.c	…
filter.c	bpf: add bpf_clone_redirect to bpf_helper_changes_pkt_data	2017-05-25 13:44:28 -04:00
flow.c	…
flow_dissector.c	…
gen_estimator.c	…
gen_stats.c	…
gro_cells.c	…
hwbm.c	…
link_watch.c	…
lwt_bpf.c	…
lwtunnel.c	…
neighbour.c	neighbour: update neigh timestamps iff update is effective	2017-05-17 11:41:38 -04:00
net-procfs.c	…
net-sysfs.c	…
net-sysfs.h	…
net-traces.c	…
net_namespace.c	net: move somaxconn init from sysctl code	2017-05-25 13:12:17 -04:00
netclassid_cgroup.c	…
netevent.c	…
netpoll.c	…
netprio_cgroup.c	…
pktgen.c	…
ptp_classifier.c	…
request_sock.c	…
rtnetlink.c	net: rtnetlink: bail out from rtnl_fdb_dump() on parse error	2017-05-24 15:27:16 -04:00
scm.c	…
secure_seq.c	…
skbuff.c	…
sock.c	net: fix compile error in skb_orphan_partial()	2017-05-17 15:10:13 -04:00
sock_diag.c	…
sock_reuseport.c	…
stream.c	…
sysctl_net_core.c	net: move somaxconn init from sysctl code	2017-05-25 13:12:17 -04:00
timestamping.c	…
tso.c	…
utils.c	…