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Wed, 10 Feb 2021 06:16:16 -0500 Received: from mail-wr1-x432.google.com (mail-wr1-x432.google.com [IPv6:2a00:1450:4864:20::432]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8B041C061222 for ; Wed, 10 Feb 2021 03:14:36 -0800 (PST) Received: by mail-wr1-x432.google.com with SMTP id v15so2029102wrx.4 for ; Wed, 10 Feb 2021 03:14:36 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=aEkhdihSwfhxGxg05o1OOrjqP2aU9xjhYWHyFiwC/aU=; b=hN8KzzcSb2zddgiPUqOecwx8mVFF8Zn4rKQsXnDt/0C4pEOaPaNZ56n6SvgTgt0GAj 0LHyzzWRFwAcy/IST+jUQ4RXrWHHL4P9Yg0jvDYkkUNpoF9hyehKAkJ3LC7jKMpTgqfW CsiPdxq0NiXPzdWdi72wYbPbc6x5BCvoe+RtU= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=aEkhdihSwfhxGxg05o1OOrjqP2aU9xjhYWHyFiwC/aU=; b=dBwf2DVpgX08Og5W/Cn9VdnyZuFHg7sV8ws0f0J2zT6Xly+ZCsC8x/6i5yvjRZ9yLV qwQMwySkebUrCeqwmu3BTKahUpcMWPdMndSWO/IXX9yv0rfSGDlNCVzw7oLlWiDKfQB7 inodVKdhy9BPDUbBBRrHo8VxDybYrKKPafwRuE5MUuJRMleylxg1t91KG94VOdWxnLx7 98it6B3dBv6qFHYn9U3W+eYOJY/ouy9jnAiZL2tZAOtOLqRZ7ssfEobUg2Ibsem6/EGT y0tmMW1htJ0exZ9CLiR4pKKLuc4g0xTLSpF2Wtmozjz4WFdVzK0tvd8aWe91NrY+zyk0 wang== X-Gm-Message-State: AOAM532xQNFT0D/g+8+i+BqmEk0Rf6eXHQiAYIFLNrY2njU2FAEkzlSS PjZ4mt0mcIHMKF9ZZkKHGE23mXvjRKVkoQ== X-Google-Smtp-Source: ABdhPJzj3HQGXP7H0JsVQ7vEj5VaWyUhXpwolnLdpHKqbkF6AW1u1OV5fywDVX0eDEp/aAm9Knvevw== X-Received: by 2002:a05:6000:1816:: with SMTP id m22mr2995427wrh.91.1612955675051; Wed, 10 Feb 2021 03:14:35 -0800 (PST) Received: from revest.zrh.corp.google.com ([2a00:79e0:42:204:31ae:b3c8:8fe:5f4d]) by smtp.gmail.com with ESMTPSA id u10sm1907633wmj.40.2021.02.10.03.14.34 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 10 Feb 2021 03:14:34 -0800 (PST) From: Florent Revest To: bpf@vger.kernel.org Cc: ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org, kpsingh@chromium.org, revest@google.com, jackmanb@chromium.org, linux-kernel@vger.kernel.org, Florent Revest , KP Singh Subject: [PATCH bpf-next v7 2/5] bpf: Expose bpf_get_socket_cookie to tracing programs Date: Wed, 10 Feb 2021 12:14:03 +0100 Message-Id: <20210210111406.785541-2-revest@chromium.org> X-Mailer: git-send-email 2.30.0.478.g8a0d178c01-goog In-Reply-To: <20210210111406.785541-1-revest@chromium.org> References: <20210210111406.785541-1-revest@chromium.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org This needs a new helper that: - can work in a sleepable context (using sock_gen_cookie) - takes a struct sock pointer and checks that it's not NULL Signed-off-by: Florent Revest Acked-by: KP Singh --- include/linux/bpf.h | 1 + include/uapi/linux/bpf.h | 8 ++++++++ kernel/trace/bpf_trace.c | 2 ++ net/core/filter.c | 12 ++++++++++++ tools/include/uapi/linux/bpf.h | 8 ++++++++ 5 files changed, 31 insertions(+) diff --git a/include/linux/bpf.h b/include/linux/bpf.h index 321966fc35db..d212ae7d9731 100644 --- a/include/linux/bpf.h +++ b/include/linux/bpf.h @@ -1888,6 +1888,7 @@ extern const struct bpf_func_proto bpf_per_cpu_ptr_proto; extern const struct bpf_func_proto bpf_this_cpu_ptr_proto; extern const struct bpf_func_proto bpf_ktime_get_coarse_ns_proto; extern const struct bpf_func_proto bpf_sock_from_file_proto; +extern const struct bpf_func_proto bpf_get_socket_ptr_cookie_proto; const struct bpf_func_proto *bpf_tracing_func_proto( enum bpf_func_id func_id, const struct bpf_prog *prog); diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h index 0b735c2729b2..a8d9ad543300 100644 --- a/include/uapi/linux/bpf.h +++ b/include/uapi/linux/bpf.h @@ -1673,6 +1673,14 @@ union bpf_attr { * Return * A 8-byte long unique number. * + * u64 bpf_get_socket_cookie(struct sock *sk) + * Description + * Equivalent to **bpf_get_socket_cookie**\ () helper that accepts + * *sk*, but gets socket from a BTF **struct sock**. This helper + * also works for sleepable programs. + * Return + * A 8-byte long unique number or 0 if *sk* is NULL. + * * u32 bpf_get_socket_uid(struct sk_buff *skb) * Return * The owner UID of the socket associated to *skb*. If the socket diff --git a/kernel/trace/bpf_trace.c b/kernel/trace/bpf_trace.c index 6c0018abe68a..845b2168e006 100644 --- a/kernel/trace/bpf_trace.c +++ b/kernel/trace/bpf_trace.c @@ -1760,6 +1760,8 @@ tracing_prog_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) return &bpf_sk_storage_delete_tracing_proto; case BPF_FUNC_sock_from_file: return &bpf_sock_from_file_proto; + case BPF_FUNC_get_socket_cookie: + return &bpf_get_socket_ptr_cookie_proto; #endif case BPF_FUNC_seq_printf: return prog->expected_attach_type == BPF_TRACE_ITER ? diff --git a/net/core/filter.c b/net/core/filter.c index e15d4741719a..57aaed478362 100644 --- a/net/core/filter.c +++ b/net/core/filter.c @@ -4631,6 +4631,18 @@ static const struct bpf_func_proto bpf_get_socket_cookie_sock_proto = { .arg1_type = ARG_PTR_TO_CTX, }; +BPF_CALL_1(bpf_get_socket_ptr_cookie, struct sock *, sk) +{ + return sk ? sock_gen_cookie(sk) : 0; +} + +const struct bpf_func_proto bpf_get_socket_ptr_cookie_proto = { + .func = bpf_get_socket_ptr_cookie, + .gpl_only = false, + .ret_type = RET_INTEGER, + .arg1_type = ARG_PTR_TO_BTF_ID_SOCK_COMMON, +}; + BPF_CALL_1(bpf_get_socket_cookie_sock_ops, struct bpf_sock_ops_kern *, ctx) { return __sock_gen_cookie(ctx->sk); diff --git a/tools/include/uapi/linux/bpf.h b/tools/include/uapi/linux/bpf.h index 0b735c2729b2..a8d9ad543300 100644 --- a/tools/include/uapi/linux/bpf.h +++ b/tools/include/uapi/linux/bpf.h @@ -1673,6 +1673,14 @@ union bpf_attr { * Return * A 8-byte long unique number. * + * u64 bpf_get_socket_cookie(struct sock *sk) + * Description + * Equivalent to **bpf_get_socket_cookie**\ () helper that accepts + * *sk*, but gets socket from a BTF **struct sock**. This helper + * also works for sleepable programs. + * Return + * A 8-byte long unique number or 0 if *sk* is NULL. + * * u32 bpf_get_socket_uid(struct sk_buff *skb) * Return * The owner UID of the socket associated to *skb*. If the socket -- 2.30.0.478.g8a0d178c01-goog