From patchwork Mon Aug 24 17:51:07 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Johannes Berg X-Patchwork-Id: 261993 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-10.0 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE, SPF_PASS, UNWANTED_LANGUAGE_BODY, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7AF21C433E1 for ; Mon, 24 Aug 2020 17:51:27 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5D43620639 for ; Mon, 24 Aug 2020 17:51:27 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727903AbgHXRv0 (ORCPT ); Mon, 24 Aug 2020 13:51:26 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37168 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726697AbgHXRvX (ORCPT ); Mon, 24 Aug 2020 13:51:23 -0400 Received: from sipsolutions.net (s3.sipsolutions.net [IPv6:2a01:4f8:191:4433::2]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 066D4C061575; Mon, 24 Aug 2020 10:51:22 -0700 (PDT) Received: by sipsolutions.net with esmtpsa (TLS1.3:ECDHE_X25519__RSA_PSS_RSAE_SHA256__AES_256_GCM:256) (Exim 4.94) (envelope-from ) id 1kAGco-00A1ue-Sm; Mon, 24 Aug 2020 19:51:18 +0200 From: Johannes Berg To: linux-wireless@vger.kernel.org, Stephen Hemminger , netdev@vger.kernel.org Cc: David Ahern Subject: [PATCH 2/3] libnetlink: add nl_print_policy() helper Date: Mon, 24 Aug 2020 19:51:07 +0200 Message-Id: <20200824175108.53101-2-johannes@sipsolutions.net> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200824175108.53101-1-johannes@sipsolutions.net> References: <20200824175108.53101-1-johannes@sipsolutions.net> MIME-Version: 1.0 Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org This prints out the data from the given nested attribute to the given FILE pointer, interpreting the firmware that the kernel has for showing netlink policies. Signed-off-by: Johannes Berg --- include/libnetlink.h | 2 ++ lib/libnetlink.c | 73 ++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 75 insertions(+) diff --git a/include/libnetlink.h b/include/libnetlink.h index 0d4a9f29afbd..b9073a6a13ad 100644 --- a/include/libnetlink.h +++ b/include/libnetlink.h @@ -289,4 +289,6 @@ int rtnl_from_file(FILE *, rtnl_listen_filter_t handler, RTA_OK(attr, RTA_PAYLOAD(nest) - ((char *)(attr) - (char *)RTA_DATA((nest)))); \ (attr) = RTA_TAIL((attr))) +void nl_print_policy(const struct rtattr *attr, FILE *fp); + #endif /* __LIBNETLINK_H__ */ diff --git a/lib/libnetlink.c b/lib/libnetlink.c index e02d6294b02e..a7b60d873afb 100644 --- a/lib/libnetlink.c +++ b/lib/libnetlink.c @@ -28,6 +28,7 @@ #include #include "libnetlink.h" +#include "utils.h" #define __aligned(x) __attribute__((aligned(x))) @@ -1440,3 +1441,75 @@ int __parse_rtattr_nested_compat(struct rtattr *tb[], int max, memset(tb, 0, sizeof(struct rtattr *) * (max + 1)); return 0; } + +static const char *get_nla_type_str(unsigned int attr) +{ + switch (attr) { +#define C(x) case NL_ATTR_TYPE_ ## x: return #x + C(U8); + C(U16); + C(U32); + C(U64); + C(STRING); + C(FLAG); + C(NESTED); + C(NESTED_ARRAY); + C(NUL_STRING); + C(BINARY); + C(S8); + C(S16); + C(S32); + C(S64); + C(BITFIELD32); + default: + return "unknown"; + } +} + +void nl_print_policy(const struct rtattr *attr, FILE *fp) +{ + const struct rtattr *pos; + + rtattr_for_each_nested(pos, attr) { + const struct rtattr *attr; + + fprintf(fp, " policy[%u]:", pos->rta_type & ~NLA_F_NESTED); + + rtattr_for_each_nested(attr, pos) { + struct rtattr *tp[NL_POLICY_TYPE_ATTR_MAX + 1]; + + parse_rtattr_nested(tp, ARRAY_SIZE(tp) - 1, attr); + + if (tp[NL_POLICY_TYPE_ATTR_TYPE]) + fprintf(fp, "attr[%u]: type=%s", + attr->rta_type & ~NLA_F_NESTED, + get_nla_type_str(rta_getattr_u32(tp[NL_POLICY_TYPE_ATTR_TYPE]))); + + if (tp[NL_POLICY_TYPE_ATTR_POLICY_IDX]) + fprintf(fp, " policy:%u", + rta_getattr_u32(tp[NL_POLICY_TYPE_ATTR_POLICY_IDX])); + + if (tp[NL_POLICY_TYPE_ATTR_POLICY_MAXTYPE]) + fprintf(fp, " maxattr:%u", + rta_getattr_u32(tp[NL_POLICY_TYPE_ATTR_POLICY_MAXTYPE])); + + if (tp[NL_POLICY_TYPE_ATTR_MIN_VALUE_S] && tp[NL_POLICY_TYPE_ATTR_MAX_VALUE_S]) + fprintf(fp, " range:[%lld,%lld]", + (signed long long)rta_getattr_u64(tp[NL_POLICY_TYPE_ATTR_MIN_VALUE_S]), + (signed long long)rta_getattr_u64(tp[NL_POLICY_TYPE_ATTR_MAX_VALUE_S])); + + if (tp[NL_POLICY_TYPE_ATTR_MIN_VALUE_U] && tp[NL_POLICY_TYPE_ATTR_MAX_VALUE_U]) + fprintf(fp, " range:[%llu,%llu]", + (unsigned long long)rta_getattr_u64(tp[NL_POLICY_TYPE_ATTR_MIN_VALUE_U]), + (unsigned long long)rta_getattr_u64(tp[NL_POLICY_TYPE_ATTR_MAX_VALUE_U])); + + if (tp[NL_POLICY_TYPE_ATTR_MIN_LENGTH]) + fprintf(fp, " min len:%u", + rta_getattr_u32(tp[NL_POLICY_TYPE_ATTR_MIN_LENGTH])); + + if (tp[NL_POLICY_TYPE_ATTR_MAX_LENGTH]) + fprintf(fp, " max len:%u", + rta_getattr_u32(tp[NL_POLICY_TYPE_ATTR_MAX_LENGTH])); + } + } +}