c7dcb6c9aa
Mark dynptr kfuncs as __weak to allow
verifier_global_subprogs/arg_ctx_{perf,kprobe,raw_tp} subtests to be
loadable on old kernels. Because bpf_dynptr_from_xdp() kfunc is used
from arg_tag_dynptr BPF program in progs/verifier_global_subprogs.c
*and* is not marked as __weak, loading any subtest from
verifier_global_subprogs fails on old kernels that don't have
bpf_dynptr_from_xdp() kfunc defined. Even if arg_tag_dynptr program
itself is not loaded, libbpf bails out on non-weak reference to
bpf_dynptr_from_xdp (that can't be resolved), which shared across all
programs in progs/verifier_global_subprogs.c.
So mark all dynptr-related kfuncs as __weak to unblock libbpf CI ([0]).
In the upcoming "kfunc in vmlinux.h" work we should make sure that
kfuncs are always declared __weak as well.
[0] https://github.com/libbpf/libbpf/actions/runs/7792673215/job/21251250831?pr=776#step:4:7961
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/r/20240206004008.1541513-1-andrii@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
79 lines
2.8 KiB
C
79 lines
2.8 KiB
C
#ifndef __BPF_KFUNCS__
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#define __BPF_KFUNCS__
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struct bpf_sock_addr_kern;
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/* Description
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* Initializes an skb-type dynptr
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* Returns
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* Error code
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*/
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extern int bpf_dynptr_from_skb(struct __sk_buff *skb, __u64 flags,
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struct bpf_dynptr *ptr__uninit) __ksym __weak;
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/* Description
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* Initializes an xdp-type dynptr
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* Returns
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* Error code
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*/
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extern int bpf_dynptr_from_xdp(struct xdp_md *xdp, __u64 flags,
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struct bpf_dynptr *ptr__uninit) __ksym __weak;
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/* Description
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* Obtain a read-only pointer to the dynptr's data
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* Returns
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* Either a direct pointer to the dynptr data or a pointer to the user-provided
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* buffer if unable to obtain a direct pointer
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*/
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extern void *bpf_dynptr_slice(const struct bpf_dynptr *ptr, __u32 offset,
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void *buffer, __u32 buffer__szk) __ksym __weak;
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/* Description
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* Obtain a read-write pointer to the dynptr's data
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* Returns
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* Either a direct pointer to the dynptr data or a pointer to the user-provided
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* buffer if unable to obtain a direct pointer
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*/
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extern void *bpf_dynptr_slice_rdwr(const struct bpf_dynptr *ptr, __u32 offset,
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void *buffer, __u32 buffer__szk) __ksym __weak;
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extern int bpf_dynptr_adjust(const struct bpf_dynptr *ptr, __u32 start, __u32 end) __ksym __weak;
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extern bool bpf_dynptr_is_null(const struct bpf_dynptr *ptr) __ksym __weak;
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extern bool bpf_dynptr_is_rdonly(const struct bpf_dynptr *ptr) __ksym __weak;
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extern __u32 bpf_dynptr_size(const struct bpf_dynptr *ptr) __ksym __weak;
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extern int bpf_dynptr_clone(const struct bpf_dynptr *ptr, struct bpf_dynptr *clone__init) __ksym __weak;
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/* Description
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* Modify the address of a AF_UNIX sockaddr.
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* Returns__bpf_kfunc
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* -EINVAL if the address size is too big or, 0 if the sockaddr was successfully modified.
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*/
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extern int bpf_sock_addr_set_sun_path(struct bpf_sock_addr_kern *sa_kern,
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const __u8 *sun_path, __u32 sun_path__sz) __ksym;
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/* Description
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* Allocate and configure a reqsk and link it with a listener and skb.
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* Returns
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* Error code
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*/
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struct sock;
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struct bpf_tcp_req_attrs;
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extern int bpf_sk_assign_tcp_reqsk(struct __sk_buff *skb, struct sock *sk,
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struct bpf_tcp_req_attrs *attrs, int attrs__sz) __ksym;
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void *bpf_cast_to_kern_ctx(void *) __ksym;
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extern void *bpf_rdonly_cast(const void *obj, __u32 btf_id) __ksym __weak;
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extern int bpf_get_file_xattr(struct file *file, const char *name,
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struct bpf_dynptr *value_ptr) __ksym;
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extern int bpf_get_fsverity_digest(struct file *file, struct bpf_dynptr *digest_ptr) __ksym;
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extern struct bpf_key *bpf_lookup_user_key(__u32 serial, __u64 flags) __ksym;
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extern struct bpf_key *bpf_lookup_system_key(__u64 id) __ksym;
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extern void bpf_key_put(struct bpf_key *key) __ksym;
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extern int bpf_verify_pkcs7_signature(struct bpf_dynptr *data_ptr,
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struct bpf_dynptr *sig_ptr,
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struct bpf_key *trusted_keyring) __ksym;
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#endif
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