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Mon, 19 Jun 2023 11:00:34 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 282A5C433C9; Mon, 19 Jun 2023 11:00:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1687172433; bh=xH16Yck6jINc2i41oFGr4laPsXS83w2BuMkWLedqgB0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=G9Tj6sJ9+Jw8jyExIoysY5lbEZ1VmtmunPLCPyPdbM8VXpQ6pRc/tCnAec19UlO/R l+rZH5oGlFV+4nZOt+yYtJCLQUB9kP02qB35jALEibQj+SMIKfZlsX4xPfWYQGpy6s KCKRptlyBLJ+mIhrlFny5cY2tAkv7o4kPKZ4pHuI= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Jamal Hadi Salim , Simon Horman , Pedro Tammela , Paolo Abeni , Sasha Levin Subject: [PATCH 5.15 067/107] net/sched: simplify tcf_pedit_act Date: Mon, 19 Jun 2023 12:30:51 +0200 Message-ID: <20230619102144.656985406@linuxfoundation.org> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230619102141.541044823@linuxfoundation.org> References: <20230619102141.541044823@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Pedro Tammela [ Upstream commit 95b069382351826c0ae37938070aa82dbeaf288d ] Remove the check for a negative number of keys as this cannot ever happen Reviewed-by: Jamal Hadi Salim Reviewed-by: Simon Horman Signed-off-by: Pedro Tammela Signed-off-by: Paolo Abeni Stable-dep-of: 6c02568fd1ae ("net/sched: act_pedit: Parse L3 Header for L4 offset") Signed-off-by: Sasha Levin --- net/sched/act_pedit.c | 137 +++++++++++++++++++++--------------------- 1 file changed, 67 insertions(+), 70 deletions(-) diff --git a/net/sched/act_pedit.c b/net/sched/act_pedit.c index 051cd20928599..0237d898fabea 100644 --- a/net/sched/act_pedit.c +++ b/net/sched/act_pedit.c @@ -349,8 +349,12 @@ static int pedit_skb_hdr_offset(struct sk_buff *skb, static int tcf_pedit_act(struct sk_buff *skb, const struct tc_action *a, struct tcf_result *res) { + enum pedit_header_type htype = TCA_PEDIT_KEY_EX_HDR_TYPE_NETWORK; + enum pedit_cmd cmd = TCA_PEDIT_KEY_EX_CMD_SET; struct tcf_pedit *p = to_pedit(a); + struct tcf_pedit_key_ex *tkey_ex; struct tcf_pedit_parms *parms; + struct tc_pedit_key *tkey; u32 max_offset; int i; @@ -366,88 +370,81 @@ static int tcf_pedit_act(struct sk_buff *skb, const struct tc_action *a, tcf_lastuse_update(&p->tcf_tm); tcf_action_update_bstats(&p->common, skb); - if (parms->tcfp_nkeys > 0) { - struct tc_pedit_key *tkey = parms->tcfp_keys; - struct tcf_pedit_key_ex *tkey_ex = parms->tcfp_keys_ex; - enum pedit_header_type htype = - TCA_PEDIT_KEY_EX_HDR_TYPE_NETWORK; - enum pedit_cmd cmd = TCA_PEDIT_KEY_EX_CMD_SET; - - for (i = parms->tcfp_nkeys; i > 0; i--, tkey++) { - u32 *ptr, hdata; - int offset = tkey->off; - int hoffset; - u32 val; - int rc; - - if (tkey_ex) { - htype = tkey_ex->htype; - cmd = tkey_ex->cmd; - - tkey_ex++; - } + tkey = parms->tcfp_keys; + tkey_ex = parms->tcfp_keys_ex; - rc = pedit_skb_hdr_offset(skb, htype, &hoffset); - if (rc) { - pr_info("tc action pedit bad header type specified (0x%x)\n", - htype); - goto bad; - } + for (i = parms->tcfp_nkeys; i > 0; i--, tkey++) { + int offset = tkey->off; + u32 *ptr, hdata; + int hoffset; + u32 val; + int rc; - if (tkey->offmask) { - u8 *d, _d; - - if (!offset_valid(skb, hoffset + tkey->at)) { - pr_info("tc action pedit 'at' offset %d out of bounds\n", - hoffset + tkey->at); - goto bad; - } - d = skb_header_pointer(skb, hoffset + tkey->at, - sizeof(_d), &_d); - if (!d) - goto bad; - offset += (*d & tkey->offmask) >> tkey->shift; - } + if (tkey_ex) { + htype = tkey_ex->htype; + cmd = tkey_ex->cmd; - if (offset % 4) { - pr_info("tc action pedit offset must be on 32 bit boundaries\n"); - goto bad; - } + tkey_ex++; + } - if (!offset_valid(skb, hoffset + offset)) { - pr_info("tc action pedit offset %d out of bounds\n", - hoffset + offset); - goto bad; - } + rc = pedit_skb_hdr_offset(skb, htype, &hoffset); + if (rc) { + pr_info("tc action pedit bad header type specified (0x%x)\n", + htype); + goto bad; + } - ptr = skb_header_pointer(skb, hoffset + offset, - sizeof(hdata), &hdata); - if (!ptr) - goto bad; - /* just do it, baby */ - switch (cmd) { - case TCA_PEDIT_KEY_EX_CMD_SET: - val = tkey->val; - break; - case TCA_PEDIT_KEY_EX_CMD_ADD: - val = (*ptr + tkey->val) & ~tkey->mask; - break; - default: - pr_info("tc action pedit bad command (%d)\n", - cmd); + if (tkey->offmask) { + u8 *d, _d; + + if (!offset_valid(skb, hoffset + tkey->at)) { + pr_info("tc action pedit 'at' offset %d out of bounds\n", + hoffset + tkey->at); goto bad; } + d = skb_header_pointer(skb, hoffset + tkey->at, + sizeof(_d), &_d); + if (!d) + goto bad; + offset += (*d & tkey->offmask) >> tkey->shift; + } - *ptr = ((*ptr & tkey->mask) ^ val); - if (ptr == &hdata) - skb_store_bits(skb, hoffset + offset, ptr, 4); + if (offset % 4) { + pr_info("tc action pedit offset must be on 32 bit boundaries\n"); + goto bad; } - goto done; - } else { - WARN(1, "pedit BUG: index %d\n", p->tcf_index); + if (!offset_valid(skb, hoffset + offset)) { + pr_info("tc action pedit offset %d out of bounds\n", + hoffset + offset); + goto bad; + } + + ptr = skb_header_pointer(skb, hoffset + offset, + sizeof(hdata), &hdata); + if (!ptr) + goto bad; + /* just do it, baby */ + switch (cmd) { + case TCA_PEDIT_KEY_EX_CMD_SET: + val = tkey->val; + break; + case TCA_PEDIT_KEY_EX_CMD_ADD: + val = (*ptr + tkey->val) & ~tkey->mask; + break; + default: + pr_info("tc action pedit bad command (%d)\n", + cmd); + goto bad; + } + + *ptr = ((*ptr & tkey->mask) ^ val); + if (ptr == &hdata) + skb_store_bits(skb, hoffset + offset, ptr, 4); } + goto done; + bad: spin_lock(&p->tcf_lock); p->tcf_qstats.overlimits++; -- 2.39.2