From: Florian Westphal <fw@strlen.de>
To: <bpf@vger.kernel.org>
Cc: <netdev@vger.kernel.org>,
ast@kernel.org, Florian Westphal <fw@strlen.de>,
Andrii Nakryiko <andrii.nakryiko@gmail.com>
Subject: [PATCH bpf] bpf: netfilter: add BPF_NETFILTER bpf_attach_type
Date: Fri, 26 May 2023 14:11:24 +0200 [thread overview]
Message-ID: <20230526121124.3915-1-fw@strlen.de> (raw)
In-Reply-To: <CAEf4BzZ69YgrQW7DHCJUT_X+GqMq_ZQQPBwopaJJVGFD5=d5Vg@mail.gmail.com>
Andrii Nakryiko writes:
And we currently don't have an attach type for NETLINK BPF link.
Thankfully it's not too late to add it. I see that link_create() in
kernel/bpf/syscall.c just bypasses attach_type check. We shouldn't
have done that. Instead we need to add BPF_NETLINK attach type to enum
bpf_attach_type. And wire all that properly throughout the kernel and
libbpf itself.
This adds BPF_NETFILTER and uses it. This breaks uabi but this
wasn't in any non-rc release yet, so it should be fine.
Fixes: 84601d6ee68a ("bpf: add bpf_link support for BPF_NETFILTER programs")
Suggested-by: Andrii Nakryiko <andrii.nakryiko@gmail.com>
Link: https://lore.kernel.org/bpf/CAEf4BzZ69YgrQW7DHCJUT_X+GqMq_ZQQPBwopaJJVGFD5=d5Vg@mail.gmail.com/
Signed-off-by: Florian Westphal <fw@strlen.de>
---
include/uapi/linux/bpf.h | 1 +
kernel/bpf/syscall.c | 4 ++++
tools/include/uapi/linux/bpf.h | 1 +
tools/lib/bpf/libbpf.c | 2 +-
4 files changed, 7 insertions(+), 1 deletion(-)
diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h
index 1bb11a6ee667..c994ff5b157c 100644
--- a/include/uapi/linux/bpf.h
+++ b/include/uapi/linux/bpf.h
@@ -1035,6 +1035,7 @@ enum bpf_attach_type {
BPF_TRACE_KPROBE_MULTI,
BPF_LSM_CGROUP,
BPF_STRUCT_OPS,
+ BPF_NETFILTER,
__MAX_BPF_ATTACH_TYPE
};
diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c
index 14f39c1e573e..cc1fc2404406 100644
--- a/kernel/bpf/syscall.c
+++ b/kernel/bpf/syscall.c
@@ -2433,6 +2433,10 @@ bpf_prog_load_check_attach(enum bpf_prog_type prog_type,
default:
return -EINVAL;
}
+ case BPF_PROG_TYPE_NETFILTER:
+ if (expected_attach_type == BPF_NETFILTER)
+ return 0;
+ return -EINVAL;
case BPF_PROG_TYPE_SYSCALL:
case BPF_PROG_TYPE_EXT:
if (expected_attach_type)
diff --git a/tools/include/uapi/linux/bpf.h b/tools/include/uapi/linux/bpf.h
index 1bb11a6ee667..c994ff5b157c 100644
--- a/tools/include/uapi/linux/bpf.h
+++ b/tools/include/uapi/linux/bpf.h
@@ -1035,6 +1035,7 @@ enum bpf_attach_type {
BPF_TRACE_KPROBE_MULTI,
BPF_LSM_CGROUP,
BPF_STRUCT_OPS,
+ BPF_NETFILTER,
__MAX_BPF_ATTACH_TYPE
};
diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
index ad1ec893b41b..532a97cf1cc1 100644
--- a/tools/lib/bpf/libbpf.c
+++ b/tools/lib/bpf/libbpf.c
@@ -8712,7 +8712,7 @@ static const struct bpf_sec_def section_defs[] = {
SEC_DEF("struct_ops+", STRUCT_OPS, 0, SEC_NONE),
SEC_DEF("struct_ops.s+", STRUCT_OPS, 0, SEC_SLEEPABLE),
SEC_DEF("sk_lookup", SK_LOOKUP, BPF_SK_LOOKUP, SEC_ATTACHABLE),
- SEC_DEF("netfilter", NETFILTER, 0, SEC_NONE),
+ SEC_DEF("netfilter", NETFILTER, BPF_NETFILTER, SEC_NONE),
};
static size_t custom_sec_def_cnt;
--
2.39.3
next prev parent reply other threads:[~2023-05-26 12:11 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-05-25 11:00 [PATCH bpf-next 0/2] libbpf: add netfilter link attach helper Florian Westphal
2023-05-25 11:00 ` [PATCH bpf-next 1/2] tools: " Florian Westphal
2023-05-25 21:01 ` Andrii Nakryiko
2023-05-26 12:11 ` Florian Westphal [this message]
2023-05-30 17:10 ` [PATCH bpf] bpf: netfilter: add BPF_NETFILTER bpf_attach_type Andrii Nakryiko
2023-05-25 11:01 ` [PATCH bpf-next 2/2] selftests/bpf: Add bpf_program__attach_netfilter_opts helper test Florian Westphal
2023-05-25 21:05 ` Andrii Nakryiko
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