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0c991ebc8c
linux/kernel/bpf
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Andrii Nakryiko 0c991ebc8c bpf: Implement bpf_prog replacement for an active bpf_cgroup_link 
Add new operation (LINK_UPDATE), which allows to replace active bpf_prog from
under given bpf_link. Currently this is only supported for bpf_cgroup_link,
but will be extended to other kinds of bpf_links in follow-up patches.

For bpf_cgroup_link, implemented functionality matches existing semantics for
direct bpf_prog attachment (including BPF_F_REPLACE flag). User can either
unconditionally set new bpf_prog regardless of which bpf_prog is currently
active under given bpf_link, or, optionally, can specify expected active
bpf_prog. If active bpf_prog doesn't match expected one, no changes are
performed, old bpf_link stays intact and attached, operation returns
a failure.

cgroup_bpf_replace() operation is resolving race between auto-detachment and
bpf_prog update in the same fashion as it's done for bpf_link detachment,
except in this case update has no way of succeeding because of target cgroup
marked as dying. So in this case error is returned.

Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20200330030001.2312810-3-andriin@fb.com
2020-03-30 17:36:33 -07:00
..
arraymap.c bpf: Add lookup and update batch ops to arraymap 2020-01-15 14:00:35 -08:00
bpf_lru_list.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 206 2019-05-30 11:29:53 -07:00
bpf_lru_list.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 206 2019-05-30 11:29:53 -07:00
bpf_lsm.c bpf: lsm: Implement attach, detach and execution 2020-03-30 01:34:00 +02:00
bpf_struct_ops_types.h bpf: tcp: Support tcp_congestion_ops in bpf 2020-01-09 08:46:18 -08:00
bpf_struct_ops.c bpf: Refactor trampoline update code 2020-03-04 13:41:05 -08:00
btf.c bpf: btf: Fix arg verification in btf_ctx_access() 2020-03-30 13:28:02 -07:00
cgroup.c bpf: Implement bpf_prog replacement for an active bpf_cgroup_link 2020-03-30 17:36:33 -07:00
core.c bpf: Enable bpf cgroup hooks to retrieve cgroup v2 and ancestor id 2020-03-27 19:40:39 -07:00
cpumap.c xdp: Make cpumap flush_list common for all map instances 2019-12-19 21:09:43 -08:00
devmap.c bpf, xdp: Remove no longer required rcu_read_{un}lock() 2020-01-27 11:16:25 +01:00
disasm.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 295 2019-06-05 17:36:38 +02:00
disasm.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 295 2019-06-05 17:36:38 +02:00
dispatcher.c bpf: Remove bpf_image tree 2020-03-13 12:49:52 -07:00
hashtab.c bpf: Replace zero-length array with flexible-array member 2020-02-28 01:21:02 +01:00
helpers.c bpf: Enable bpf cgroup hooks to retrieve cgroup v2 and ancestor id 2020-03-27 19:40:39 -07:00
inode.c bpf: Introduce pinnable bpf_link abstraction 2020-03-02 22:06:27 -08:00
local_storage.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2019-12-22 09:54:33 -08:00
lpm_trie.c bpf: Replace zero-length array with flexible-array member 2020-02-28 01:21:02 +01:00
Makefile bpf: Introduce BPF_PROG_TYPE_LSM 2020-03-30 01:34:00 +02:00
map_in_map.c bpf: Introduce BPF_MAP_TYPE_STRUCT_OPS 2020-01-09 08:46:18 -08:00
map_in_map.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 206 2019-05-30 11:29:53 -07:00
offload.c bpf, offload: Replace bitwise AND by logical AND in bpf_prog_offload_info_fill 2020-02-17 16:53:49 +01:00
percpu_freelist.c bpf: Dont iterate over possible CPUs with interrupts disabled 2020-02-24 16:18:20 -08:00
percpu_freelist.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 206 2019-05-30 11:29:53 -07:00
queue_stack_maps.c bpf: move memory size checks to bpf_map_charge_init() 2019-05-31 16:52:56 -07:00
reuseport_array.c net: Generate reuseport group ID on group creation 2020-02-21 22:29:45 +01:00
stackmap.c bpf/stackmap: Dont trylock mmap_sem with PREEMPT_RT and interrupts disabled 2020-02-24 16:20:10 -08:00
syscall.c bpf: Implement bpf_prog replacement for an active bpf_cgroup_link 2020-03-30 17:36:33 -07:00
sysfs_btf.c bpf: Support llvm-objcopy for vmlinux BTF 2020-03-19 12:32:38 +01:00
tnum.c bpf: Verifier, do explicit ALU32 bounds tracking 2020-03-30 14:59:53 -07:00
trampoline.c bpf: lsm: Implement attach, detach and execution 2020-03-30 01:34:00 +02:00
verifier.c bpf: Verifier, refine 32bit bound in do_refine_retval_range 2020-03-30 15:00:30 -07:00
xskmap.c xsk: Make xskmap flush_list common for all map instances 2019-12-19 21:09:43 -08:00