Toke Høiland-Jørgensen 92234c8f15 xdp: Support specifying expected existing program when attaching XDP ... While it is currently possible for userspace to specify that an existing XDP program should not be replaced when attaching to an interface, there is no mechanism to safely replace a specific XDP program with another. This patch adds a new netlink attribute, IFLA_XDP_EXPECTED_FD, which can be set along with IFLA_XDP_FD. If set, the kernel will check that the program currently loaded on the interface matches the expected one, and fail the operation if it does not. This corresponds to a 'cmpxchg' memory operation. Setting the new attribute with a negative value means that no program is expected to be attached, which corresponds to setting the UPDATE_IF_NOEXIST flag. A new companion flag, XDP_FLAGS_REPLACE, is also added to explicitly request checking of the EXPECTED_FD attribute. This is needed for userspace to discover whether the kernel supports the new attribute. Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Reviewed-by: Jakub Kicinski <kuba@kernel.org> Link: https://lore.kernel.org/bpf/158515700640.92963.3551295145441017022.stgit@toke.dk		2020-03-28 14:24:41 -07:00
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bpf_sk_storage.c	Merge git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next	2020-02-29 15:53:35 -08:00
datagram.c	net: datagram: drop 'destructor' argument from several helpers	2020-02-28 12:12:53 -08:00
datagram.h	net/core: Allow the compiler to verify declaration and definition consistency	2019-03-27 13:49:44 -07:00
dev_addr_lists.c	net: remove unnecessary variables and callback	2019-10-24 14:53:49 -07:00
dev_ioctl.c	net: Introduce peer to peer one step PTP time stamping.	2019-12-25 19:51:34 -08:00
dev.c	xdp: Support specifying expected existing program when attaching XDP	2020-03-28 14:24:41 -07:00
devlink.c	Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net	2020-03-12 22:34:48 -07:00
drop_monitor.c	net: core: Replace zero-length array with flexible-array member	2020-02-28 12:08:37 -08:00
dst_cache.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152	2019-05-30 11:26:32 -07:00
dst.c	net: print proper warning on dst underflow	2019-09-26 09:05:56 +02:00
failover.c	failover: allow name change on IFF_UP slave interfaces	2019-04-10 22:12:26 -07:00
fib_notifier.c	net: fib_notifier: propagate extack down to the notifier block callback	2019-10-04 11:10:56 -07:00
fib_rules.c	net: fib_rules: Correctly set table field when table number exceeds 8 bits	2020-02-16 18:38:24 -08:00
filter.c	bpf: Enable retrival of pid/tgid/comm from bpf cgroup hooks	2020-03-27 19:40:39 -07:00
flow_dissector.c	bpf: Use bpf_prog_run_pin_on_cpu() at simple call sites.	2020-02-24 16:20:09 -08:00
flow_offload.c	flow_offload: Add flow_match_ct to get rule ct match	2020-03-12 15:00:39 -07:00
gen_estimator.c	net_sched: gen_estimator: extend packet counter to 64bit	2019-11-06 21:51:36 -08:00
gen_stats.c	net_sched: add TCA_STATS_PKT64 attribute	2019-11-05 18:20:55 -08:00
gro_cells.c	gro_cells: make sure device is up in gro_cells_receive()	2019-03-10 11:07:14 -07:00
hwbm.c	net: hwbm: Make the hwbm_pool lock a mutex	2019-06-09 19:40:10 -07:00
link_watch.c	net: link_watch: prevent starvation when processing linkwatch wq	2019-07-01 19:02:47 -07:00
lwt_bpf.c	net: ipv6_stub: use ip6_dst_lookup_flow instead of ip6_dst_lookup	2019-12-04 12:27:13 -08:00
lwtunnel.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152	2019-05-30 11:26:32 -07:00
Makefile	ethtool: move to its own directory	2019-12-12 17:07:05 -08:00
neighbour.c	net: neigh: remove unused NEIGH_SYSCTL_MS_JIFFIES_ENTRY	2020-02-20 10:02:23 -08:00
net_namespace.c	bpf: Add netns cookie and enable it for bpf cgroup hooks	2020-03-27 19:40:38 -07:00
net-procfs.c	net: procfs: use index hashlist instead of name hashlist	2019-10-01 14:47:19 -07:00
net-sysfs.c	net-sysfs: add queue_change_owner()	2020-02-26 20:07:26 -08:00
net-sysfs.h	net-sysfs: add netdev_change_owner()	2020-02-26 20:07:25 -08:00
net-traces.c	page_pool: add tracepoints for page_pool with details need by XDP	2019-06-19 11:23:13 -04:00
netclassid_cgroup.c	cgroup, netclassid: periodically release file_lock on classid updating	2020-03-09 18:13:39 -07:00
netevent.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152	2019-05-30 11:26:32 -07:00
netpoll.c	net: fix skb use after free in netpoll	2019-08-27 20:52:02 -07:00
netprio_cgroup.c	netprio: use css ID instead of cgroup ID	2019-11-12 08:18:03 -08:00
page_pool.c	net: page_pool: API cleanup and comments	2020-02-20 10:09:25 -08:00
pktgen.c	pktgen: Allow on loopback device	2020-03-10 15:44:59 -07:00
ptp_classifier.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 295	2019-06-05 17:36:38 +02:00
request_sock.c	tcp: add rcu protection around tp->fastopen_rsk	2019-10-13 10:13:08 -07:00
rtnetlink.c	xdp: Support specifying expected existing program when attaching XDP	2020-03-28 14:24:41 -07:00
scm.c	y2038: socket: remove timespec reference in timestamping	2019-11-15 14:38:29 +01:00
secure_seq.c	treewide: Add SPDX license identifier for missed files	2019-05-21 10:50:45 +02:00
skbuff.c	net: core: Distribute switch variables for initialization	2020-02-20 10:00:19 -08:00
skmsg.c	bpf: Use bpf_prog_run_pin_on_cpu() at simple call sites.	2020-02-24 16:20:09 -08:00
sock_diag.c	sock: make cookie generation global instead of per netns	2019-08-09 13:14:46 -07:00
sock_map.c	bpf: sockmap: Add UDP support	2020-03-09 22:34:58 +01:00
sock_reuseport.c	net: Generate reuseport group ID on group creation	2020-02-21 22:29:45 +01:00
sock.c	Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net	2020-03-12 22:34:48 -07:00
stream.c	tcp: make sure EPOLLOUT wont be missed	2019-08-19 13:07:43 -07:00
sysctl_net_core.c	net, sysctl: Fix compiler warning when only cBPF is present	2019-12-19 17:17:51 +01:00
timestamping.c	net: Introduce a new MII time stamping interface.	2019-12-25 19:51:33 -08:00
tso.c	net: Use skb accessors in network core	2019-07-22 20:47:56 -07:00
utils.c	net: Fix skb->csum update in inet_proto_csum_replace16().	2020-01-24 20:54:30 +01:00
xdp.c	net: page_pool: API cleanup and comments	2020-02-20 10:09:25 -08:00