Re: [PATCH bpf-next v2 1/2] bpf: add bpf_strcasestr,bpf_strncasestr kfuncs

[Andrii Nakryiko]

On Sat, Oct 4, 2025 at 7:52 AM Rong Tao <rtoax@xxxxxxxxxxx> wrote:
>
> From: Rong Tao <rongtao@xxxxxxxx>
>
> bpf_strcasestr() and bpf_strncasestr() functions perform same like
> bpf_strstr() and bpf_strnstr() except ignoring the case of the
> characters.
>
> Signed-off-by: Rong Tao <rongtao@xxxxxxxx>
> ---
>  kernel/bpf/helpers.c | 96 ++++++++++++++++++++++++++++++++++----------
>  1 file changed, 75 insertions(+), 21 deletions(-)
>
> diff --git a/kernel/bpf/helpers.c b/kernel/bpf/helpers.c
> index c9fab9a356df..4df902e5f208 100644
> --- a/kernel/bpf/helpers.c
> +++ b/kernel/bpf/helpers.c
> @@ -3675,34 +3675,20 @@ __bpf_kfunc int bpf_strcspn(const char *s__ign, const char *reject__ign)
>         return -EFAULT;
>  }
>
> -/**
> - * bpf_strnstr - Find the first substring in a length-limited string
> - * @s1__ign: The string to be searched
> - * @s2__ign: The string to search for
> - * @len: the maximum number of characters to search
> - *
> - * Return:
> - * * >=0      - Index of the first character of the first occurrence of @s2__ign
> - *              within the first @len characters of @s1__ign
> - * * %-ENOENT - @s2__ign not found in the first @len characters of @s1__ign
> - * * %-EFAULT - Cannot read one of the strings
> - * * %-E2BIG  - One of the strings is too large
> - * * %-ERANGE - One of the strings is outside of kernel address space
> - */
> -__bpf_kfunc int bpf_strnstr(const char *s1__ign, const char *s2__ign, size_t len)
> +int __bpf_strnstr(const char *s1, const char *s2, size_t len, bool ignore_case)

keep it static?

pw-bot: cr


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