From patchwork Fri Apr 28 15:34:45 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alan Maguire X-Patchwork-Id: 677940 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id C24A0C7EE24 for ; Fri, 28 Apr 2023 15:35:10 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1346474AbjD1PfI (ORCPT ); Fri, 28 Apr 2023 11:35:08 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49082 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1346518AbjD1PfE (ORCPT ); Fri, 28 Apr 2023 11:35:04 -0400 Received: from mx0b-00069f02.pphosted.com (mx0b-00069f02.pphosted.com [205.220.177.32]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 554301FFB; Fri, 28 Apr 2023 08:35:03 -0700 (PDT) Received: from pps.filterd (m0333520.ppops.net [127.0.0.1]) by mx0b-00069f02.pphosted.com (8.17.1.19/8.17.1.19) with ESMTP id 33SF3uCY001561; 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Fri, 28 Apr 2023 15:34:57 GMT Received: from pps.reinject (localhost [127.0.0.1]) by phxpaimrmta02.imrmtpd1.prodappphxaev1.oraclevcn.com (PPS) with ESMTPS id 3q461b4rpr-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 28 Apr 2023 15:34:57 +0000 Received: from phxpaimrmta02.imrmtpd1.prodappphxaev1.oraclevcn.com (phxpaimrmta02.imrmtpd1.prodappphxaev1.oraclevcn.com [127.0.0.1]) by pps.reinject (8.17.1.5/8.17.1.5) with ESMTP id 33SFYqUE028134; Fri, 28 Apr 2023 15:34:57 GMT Received: from myrouter.uk.oracle.com (dhcp-10-175-188-60.vpn.oracle.com [10.175.188.60]) by phxpaimrmta02.imrmtpd1.prodappphxaev1.oraclevcn.com (PPS) with ESMTP id 3q461b4rm0-3; Fri, 28 Apr 2023 15:34:56 +0000 From: Alan Maguire To: rostedt@goodmis.org, mhiramat@kernel.org Cc: corbet@lwn.net, shuah@kernel.org, linux-trace-kernel@vger.kernel.org, linux-doc@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, Alan Maguire Subject: [PATCH v2 tracing 2/6] tracing: support IPv4 address filter predicate Date: Fri, 28 Apr 2023 16:34:45 +0100 Message-Id: <1682696089-27937-3-git-send-email-alan.maguire@oracle.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1682696089-27937-1-git-send-email-alan.maguire@oracle.com> References: <1682696089-27937-1-git-send-email-alan.maguire@oracle.com> X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.254,Aquarius:18.0.942,Hydra:6.0.573,FMLib:17.11.170.22 definitions=2023-04-28_04,2023-04-27_01,2023-02-09_01 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 spamscore=0 mlxscore=0 phishscore=0 mlxlogscore=999 adultscore=0 suspectscore=0 malwarescore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2303200000 definitions=main-2304280125 X-Proofpoint-GUID: PFChNbtqyuwrdE_yijqNgJq5ob7yTXIL X-Proofpoint-ORIG-GUID: PFChNbtqyuwrdE_yijqNgJq5ob7yTXIL Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org Support '==' and '!=' predicates for IPv4 address format; for example cd /sys/kernel/debug/tracing/events/tcp/tcp_receive_reset echo "saddr == 127.0.0.1" > filter Signed-off-by: Alan Maguire --- kernel/trace/trace_events_filter.c | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) diff --git a/kernel/trace/trace_events_filter.c b/kernel/trace/trace_events_filter.c index 64f1dfb72cb5..d8e08d3c3594 100644 --- a/kernel/trace/trace_events_filter.c +++ b/kernel/trace/trace_events_filter.c @@ -1384,6 +1384,7 @@ static int parse_pred(const char *str, void *data, unsigned long size; unsigned long ip; char num_buf[24]; /* Big enough to hold an address */ + char scratch[4]; /* Big enough to hold an IPv4 address */ u8 *pred_val; char *field_name; char *name; @@ -1646,6 +1647,24 @@ static int parse_pred(const char *str, void *data, /* go past the last quote */ i++; + } else if (field->size == 4 && + sscanf(&str[i], "%hhd.%hhd.%hhd.%hhd", + /* assume address in network byte order */ + &scratch[0], &scratch[1], &scratch[2], &scratch[3]) == 4) { + /* For IPv4 addresses, only '==' or '!=' are supported. */ + if (pred->op != OP_EQ && pred->op != OP_NE) { + parse_error(pe, FILT_ERR_ILLEGAL_FIELD_OP, pos + i); + goto err_free; + } + while (isdigit(str[i]) || str[i] == '.') + i++; + pred_val = kzalloc(field->size, GFP_KERNEL); + memcpy(pred_val, scratch, field->size); + pred->val = (u64)pred_val; + pred->fn_num = FILTER_PRED_FN_MEMCMP; + if (pred->op == OP_NE) + pred->not = 1; + } else if (str[i] == '0' && tolower(str[i + 1]) == 'x' && field->size > 8) { /* For sizes > 8 bytes, we store hex bytes for comparison;