Yonghong Song af7ec13833 bpf: Add bpf_skc_to_tcp6_sock() helper ... The helper is used in tracing programs to cast a socket pointer to a tcp6_sock pointer. The return value could be NULL if the casting is illegal. A new helper return type RET_PTR_TO_BTF_ID_OR_NULL is added so the verifier is able to deduce proper return types for the helper. Different from the previous BTF_ID based helpers, the bpf_skc_to_tcp6_sock() argument can be several possible btf_ids. More specifically, all possible socket data structures with sock_common appearing in the first in the memory layout. This patch only added socket types related to tcp and udp. All possible argument btf_id and return value btf_id for helper bpf_skc_to_tcp6_sock() are pre-calculcated and cached. In the future, it is even possible to precompute these btf_id's at kernel build time. Signed-off-by: Yonghong Song <yhs@fb.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Acked-by: Andrii Nakryiko <andriin@fb.com> Acked-by: Martin KaFai Lau <kafai@fb.com> Link: https://lore.kernel.org/bpf/20200623230809.3988195-1-yhs@fb.com		2020-06-24 18:37:59 -07:00
..
arraymap.c	bpf: Set map_btf_{name, id} for all map types	2020-06-22 22:22:58 +02:00
bpf_iter.c	bpf: Enable bpf_iter targets registering ctx argument types	2020-05-13 12:30:50 -07:00
bpf_lru_list.c
bpf_lru_list.h
bpf_lsm.c	bpf: Use tracing helpers for lsm programs	2020-06-01 15:08:04 -07:00
bpf_struct_ops_types.h
bpf_struct_ops.c	bpf: Set map_btf_{name, id} for all map types	2020-06-22 22:22:58 +02:00
btf.c	bpf: Add bpf_skc_to_tcp6_sock() helper	2020-06-24 18:37:59 -07:00
cgroup.c	bpf: cgroup: Allow multi-attach program to replace itself	2020-06-09 11:21:43 -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	bpf: Set map_btf_{name, id} for all map types	2020-06-22 22:22:58 +02:00
devmap.c	bpf: Set map_btf_{name, id} for all map types	2020-06-22 22:22:58 +02:00
disasm.c
disasm.h
dispatcher.c
hashtab.c	bpf: Set map_btf_{name, id} for all map types	2020-06-22 22:22:58 +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	bpf: Set map_btf_{name, id} for all map types	2020-06-22 22:22:58 +02:00
lpm_trie.c	bpf: Set map_btf_{name, id} for all map types	2020-06-22 22:22:58 +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
map_iter.c	bpf: Enable bpf_iter targets registering ctx argument types	2020-05-13 12:30:50 -07:00
net_namespace.c	bpf: Add link-based BPF program attachment to network namespace	2020-06-01 15:21:03 -07:00
offload.c
percpu_freelist.c
percpu_freelist.h
queue_stack_maps.c	bpf: Set map_btf_{name, id} for all map types	2020-06-22 22:22:58 +02:00
reuseport_array.c	bpf: Set map_btf_{name, id} for all map types	2020-06-22 22:22:58 +02:00
ringbuf.c	bpf: Set map_btf_{name, id} for all map types	2020-06-22 22:22:58 +02:00
stackmap.c	bpf: Set map_btf_{name, id} for all map types	2020-06-22 22:22:58 +02:00
syscall.c	Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net	2020-06-13 16:27:13 -07:00
sysfs_btf.c
task_iter.c	bpf: Fix bpf_iter's task iterator logic	2020-05-14 18:37:32 -07:00
tnum.c
trampoline.c
verifier.c	bpf: Add bpf_skc_to_tcp6_sock() helper	2020-06-24 18:37:59 -07:00