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695c12147a
linux/kernel/bpf
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Jakub Sitnicki 695c12147a bpf, netns: Keep attached programs in bpf_prog_array 
Prepare for having multi-prog attachments for new netns attach types by
storing programs to run in a bpf_prog_array, which is well suited for
iterating over programs and running them in sequence.

After this change bpf(PROG_QUERY) may block to allocate memory in
bpf_prog_array_copy_to_user() for collected program IDs. This forces a
change in how we protect access to the attached program in the query
callback. Because bpf_prog_array_copy_to_user() can sleep, we switch from
an RCU read lock to holding a mutex that serializes updaters.

Because we allow only one BPF flow_dissector program to be attached to
netns at all times, the bpf_prog_array pointed by net->bpf.run_array is
always either detached (null) or one element long.

No functional changes intended.

Signed-off-by: Jakub Sitnicki <jakub@cloudflare.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Martin KaFai Lau <kafai@fb.com>
Acked-by: Andrii Nakryiko <andriin@fb.com>
Link: https://lore.kernel.org/bpf/20200625141357.910330-3-jakub@cloudflare.com
2020-06-30 10:45:08 -07:00
..
arraymap.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2020-05-15 13:48:59 -07:00
bpf_iter.c bpf: Enable bpf_iter targets registering ctx argument types 2020-05-13 12:30:50 -07:00
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 bpf: Fix a typo "inacitve" -> "inactive" 2020-04-06 21:54:10 +02:00
bpf_lsm.c bpf: Use tracing helpers for lsm programs 2020-06-01 15:08:04 -07:00
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: Implement CAP_BPF 2020-05-15 17:29:41 +02:00
btf.c bpf: Do not allow btf_ctx_access with __int128 types 2020-06-25 16:17:05 +02:00
cgroup.c bpf: Don't return EINVAL from {get,set}sockopt when optlen > PAGE_SIZE 2020-06-17 10:54:05 -07:00
core.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next 2020-06-03 16:27:18 -07:00
cpumap.c xdp: Rename convert_to_xdp_frame in xdp_convert_buff_to_frame 2020-06-01 15:02:53 -07:00
devmap.c devmap: Use bpf_map_area_alloc() for allocating hash buckets 2020-06-17 10:01:19 -07:00
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: Implement CAP_BPF 2020-05-15 17:29:41 +02:00
helpers.c bpf: Implement BPF ring buffer and verifier support for it 2020-06-01 14:38:22 -07:00
inode.c bpf: Create file bpf iterator 2020-05-09 17:05:26 -07:00
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: Implement CAP_BPF 2020-05-15 17:29:41 +02:00
Makefile flow_dissector: Move out netns_bpf prog callbacks 2020-06-01 15:21:02 -07:00
map_in_map.c bpf: Implement CAP_BPF 2020-05-15 17:29:41 +02:00
map_in_map.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 206 2019-05-30 11:29:53 -07:00
map_iter.c bpf: Enable bpf_iter targets registering ctx argument types 2020-05-13 12:30:50 -07:00
net_namespace.c bpf, netns: Keep attached programs in bpf_prog_array 2020-06-30 10:45:08 -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: Implement CAP_BPF 2020-05-15 17:29:41 +02:00
reuseport_array.c bpf: Implement CAP_BPF 2020-05-15 17:29:41 +02:00
ringbuf.c bpf: Enforce BPF ringbuf size to be the power of 2 2020-06-30 16:31:55 +02:00
stackmap.c mmap locking API: add mmap_read_trylock_non_owner() 2020-06-09 09:39:14 -07:00
syscall.c bpf: Restore behaviour of CAP_SYS_ADMIN allowing the loading of networking bpf programs 2020-06-23 17:45:42 -07:00
sysfs_btf.c bpf: Support llvm-objcopy for vmlinux BTF 2020-03-19 12:32:38 +01:00
task_iter.c bpf: Fix bpf_iter's task iterator logic 2020-05-14 18:37:32 -07:00
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: Set the number of exception entries properly for subprograms 2020-06-23 17:27:37 -07:00