From patchwork Wed Apr 29 13:48:43 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Johannes Berg X-Patchwork-Id: 215792 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=-9.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE, SPF_PASS, 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 CDFE7C83009 for ; Wed, 29 Apr 2020 13:49:04 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B25542083B for ; Wed, 29 Apr 2020 13:49:04 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727983AbgD2NtD (ORCPT ); Wed, 29 Apr 2020 09:49:03 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54930 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727934AbgD2Ns7 (ORCPT ); Wed, 29 Apr 2020 09:48:59 -0400 Received: from sipsolutions.net (s3.sipsolutions.net [IPv6:2a01:4f8:191:4433::2]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 60D87C03C1AD; Wed, 29 Apr 2020 06:48:59 -0700 (PDT) Received: by sipsolutions.net with esmtpsa (TLS1.3:ECDHE_X25519__RSA_PSS_RSAE_SHA256__AES_256_GCM:256) (Exim 4.93) (envelope-from ) id 1jTn57-001vkM-N6; Wed, 29 Apr 2020 15:48:57 +0200 From: Johannes Berg To: netdev@vger.kernel.org Cc: Antonio Quartulli , linux-wireless@vger.kernel.org, Johannes Berg Subject: [PATCH 7/7] netlink: factor out policy range helpers Date: Wed, 29 Apr 2020 15:48:43 +0200 Message-Id: <20200429154836.02b4e60d49a3.Ibb79f28261ecab0dd1de120da488db29cf011389@changeid> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200429134843.42224-1-johannes@sipsolutions.net> References: <20200429134843.42224-1-johannes@sipsolutions.net> MIME-Version: 1.0 Sender: linux-wireless-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org From: Johannes Berg Add helpers to get the policy's signed/unsigned range validation data. Signed-off-by: Johannes Berg --- include/net/netlink.h | 5 +++ lib/nlattr.c | 95 +++++++++++++++++++++++++++++++++---------- 2 files changed, 79 insertions(+), 21 deletions(-) diff --git a/include/net/netlink.h b/include/net/netlink.h index 4d4a733f1e8d..557b67f1db99 100644 --- a/include/net/netlink.h +++ b/include/net/netlink.h @@ -1928,4 +1928,9 @@ static inline bool nla_is_last(const struct nlattr *nla, int rem) return nla->nla_len == rem; } +void nla_get_range_unsigned(const struct nla_policy *pt, + struct netlink_range_validation *range); +void nla_get_range_signed(const struct nla_policy *pt, + struct netlink_range_validation_signed *range); + #endif diff --git a/lib/nlattr.c b/lib/nlattr.c index 6e4cb9458050..b78495ef6d31 100644 --- a/lib/nlattr.c +++ b/lib/nlattr.c @@ -111,25 +111,39 @@ static int nla_validate_array(const struct nlattr *head, int len, int maxtype, return 0; } -static int nla_validate_int_range_unsigned(const struct nla_policy *pt, - const struct nlattr *nla, - struct netlink_ext_ack *extack) +void nla_get_range_unsigned(const struct nla_policy *pt, + struct netlink_range_validation *range) { - struct netlink_range_validation _range = { - .min = 0, - .max = U64_MAX, - }, *range = &_range; - u64 value; - WARN_ON_ONCE(pt->min < 0 || pt->max < 0); + range->min = 0; + + switch (pt->type) { + case NLA_U8: + range->max = U8_MAX; + break; + case NLA_U16: + range->max = U16_MAX; + break; + case NLA_U32: + range->max = U32_MAX; + break; + case NLA_U64: + case NLA_MSECS: + range->max = U64_MAX; + break; + default: + WARN_ON_ONCE(1); + return; + } + switch (pt->validation_type) { case NLA_VALIDATE_RANGE: range->min = pt->min; range->max = pt->max; break; case NLA_VALIDATE_RANGE_PTR: - range = pt->range; + *range = *pt->range; break; case NLA_VALIDATE_MIN: range->min = pt->min; @@ -137,7 +151,17 @@ static int nla_validate_int_range_unsigned(const struct nla_policy *pt, case NLA_VALIDATE_MAX: range->max = pt->max; break; + default: + break; } +} + +static int nla_validate_int_range_unsigned(const struct nla_policy *pt, + const struct nlattr *nla, + struct netlink_ext_ack *extack) +{ + struct netlink_range_validation range; + u64 value; switch (pt->type) { case NLA_U8: @@ -157,7 +181,9 @@ static int nla_validate_int_range_unsigned(const struct nla_policy *pt, return -EINVAL; } - if (value < range->min || value > range->max) { + nla_get_range_unsigned(pt, &range); + + if (value < range.min || value > range.max) { NL_SET_ERR_MSG_ATTR(extack, nla, "integer out of range"); return -ERANGE; @@ -166,15 +192,30 @@ static int nla_validate_int_range_unsigned(const struct nla_policy *pt, return 0; } -static int nla_validate_int_range_signed(const struct nla_policy *pt, - const struct nlattr *nla, - struct netlink_ext_ack *extack) +void nla_get_range_signed(const struct nla_policy *pt, + struct netlink_range_validation_signed *range) { - struct netlink_range_validation_signed _range = { - .min = S64_MIN, - .max = S64_MAX, - }, *range = &_range; - s64 value; + switch (pt->type) { + case NLA_S8: + range->min = S8_MIN; + range->max = S8_MAX; + break; + case NLA_S16: + range->min = S16_MIN; + range->max = S16_MAX; + break; + case NLA_S32: + range->min = S32_MIN; + range->max = S32_MAX; + break; + case NLA_S64: + range->min = S64_MIN; + range->max = S64_MAX; + break; + default: + WARN_ON_ONCE(1); + return; + } switch (pt->validation_type) { case NLA_VALIDATE_RANGE: @@ -182,7 +223,7 @@ static int nla_validate_int_range_signed(const struct nla_policy *pt, range->max = pt->max; break; case NLA_VALIDATE_RANGE_PTR: - range = pt->range_signed; + *range = *pt->range_signed; break; case NLA_VALIDATE_MIN: range->min = pt->min; @@ -190,7 +231,17 @@ static int nla_validate_int_range_signed(const struct nla_policy *pt, case NLA_VALIDATE_MAX: range->max = pt->max; break; + default: + break; } +} + +static int nla_validate_int_range_signed(const struct nla_policy *pt, + const struct nlattr *nla, + struct netlink_ext_ack *extack) +{ + struct netlink_range_validation_signed range; + s64 value; switch (pt->type) { case NLA_S8: @@ -209,7 +260,9 @@ static int nla_validate_int_range_signed(const struct nla_policy *pt, return -EINVAL; } - if (value < range->min || value > range->max) { + nla_get_range_signed(pt, &range); + + if (value < range.min || value > range.max) { NL_SET_ERR_MSG_ATTR(extack, nla, "integer out of range"); return -ERANGE;