From patchwork Fri Jun 11 10:50:11 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Florian Westphal X-Patchwork-Id: 458967 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=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI, 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 63369C48BD1 for ; Fri, 11 Jun 2021 10:50:37 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 490EB613F3 for ; Fri, 11 Jun 2021 10:50:37 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231161AbhFKKwd (ORCPT ); Fri, 11 Jun 2021 06:52:33 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33950 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231230AbhFKKwa (ORCPT ); Fri, 11 Jun 2021 06:52:30 -0400 Received: from Chamillionaire.breakpoint.cc (Chamillionaire.breakpoint.cc [IPv6:2a0a:51c0:0:12e:520::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 26B08C0617AF for ; Fri, 11 Jun 2021 03:50:32 -0700 (PDT) Received: from fw by Chamillionaire.breakpoint.cc with local (Exim 4.92) (envelope-from ) id 1lrekA-0007iF-Lr; Fri, 11 Jun 2021 12:50:30 +0200 From: Florian Westphal To: Cc: steffen.klassert@secunet.com, herbert@gondor.apana.org.au, Florian Westphal Subject: [PATCH ipsec-next v2 2/5] xfrm: ipv6: move mip6_destopt_offset into xfrm core Date: Fri, 11 Jun 2021 12:50:11 +0200 Message-Id: <20210611105014.4675-3-fw@strlen.de> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210611105014.4675-1-fw@strlen.de> References: <20210611105014.4675-1-fw@strlen.de> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org This helper is relatively small, just move this to the xfrm core and call it directly. Next patch does the same for the ROUTING type. Signed-off-by: Florian Westphal --- net/ipv6/mip6.c | 49 ------------------------------------ net/xfrm/xfrm_output.c | 57 ++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 57 insertions(+), 49 deletions(-) diff --git a/net/ipv6/mip6.c b/net/ipv6/mip6.c index bc560e1664aa..fba3b56a7dd2 100644 --- a/net/ipv6/mip6.c +++ b/net/ipv6/mip6.c @@ -247,54 +247,6 @@ static int mip6_destopt_reject(struct xfrm_state *x, struct sk_buff *skb, return err; } -static int mip6_destopt_offset(struct xfrm_state *x, struct sk_buff *skb, - u8 **nexthdr) -{ - u16 offset = sizeof(struct ipv6hdr); - struct ipv6_opt_hdr *exthdr = - (struct ipv6_opt_hdr *)(ipv6_hdr(skb) + 1); - const unsigned char *nh = skb_network_header(skb); - unsigned int packet_len = skb_tail_pointer(skb) - - skb_network_header(skb); - int found_rhdr = 0; - - *nexthdr = &ipv6_hdr(skb)->nexthdr; - - while (offset + 1 <= packet_len) { - - switch (**nexthdr) { - case NEXTHDR_HOP: - break; - case NEXTHDR_ROUTING: - found_rhdr = 1; - break; - case NEXTHDR_DEST: - /* - * HAO MUST NOT appear more than once. - * XXX: It is better to try to find by the end of - * XXX: packet if HAO exists. - */ - if (ipv6_find_tlv(skb, offset, IPV6_TLV_HAO) >= 0) { - net_dbg_ratelimited("mip6: hao exists already, override\n"); - return offset; - } - - if (found_rhdr) - return offset; - - break; - default: - return offset; - } - - offset += ipv6_optlen(exthdr); - *nexthdr = &exthdr->nexthdr; - exthdr = (struct ipv6_opt_hdr *)(nh + offset); - } - - return offset; -} - static int mip6_destopt_init_state(struct xfrm_state *x) { if (x->id.spi) { @@ -332,7 +284,6 @@ static const struct xfrm_type mip6_destopt_type = { .input = mip6_destopt_input, .output = mip6_destopt_output, .reject = mip6_destopt_reject, - .hdr_offset = mip6_destopt_offset, }; static int mip6_rthdr_input(struct xfrm_state *x, struct sk_buff *skb) diff --git a/net/xfrm/xfrm_output.c b/net/xfrm/xfrm_output.c index 6b44b6e738f7..29959054a535 100644 --- a/net/xfrm/xfrm_output.c +++ b/net/xfrm/xfrm_output.c @@ -77,8 +77,65 @@ static int xfrm4_transport_output(struct xfrm_state *x, struct sk_buff *skb) return 0; } +#if IS_ENABLED(CONFIG_IPV6_MIP6) +static int mip6_destopt_offset(struct xfrm_state *x, struct sk_buff *skb, + u8 **nexthdr) +{ + u16 offset = sizeof(struct ipv6hdr); + struct ipv6_opt_hdr *exthdr = + (struct ipv6_opt_hdr *)(ipv6_hdr(skb) + 1); + const unsigned char *nh = skb_network_header(skb); + unsigned int packet_len = skb_tail_pointer(skb) - + skb_network_header(skb); + int found_rhdr = 0; + + *nexthdr = &ipv6_hdr(skb)->nexthdr; + + while (offset + 1 <= packet_len) { + switch (**nexthdr) { + case NEXTHDR_HOP: + break; + case NEXTHDR_ROUTING: + found_rhdr = 1; + break; + case NEXTHDR_DEST: + /* HAO MUST NOT appear more than once. + * XXX: It is better to try to find by the end of + * XXX: packet if HAO exists. + */ + if (ipv6_find_tlv(skb, offset, IPV6_TLV_HAO) >= 0) { + net_dbg_ratelimited("mip6: hao exists already, override\n"); + return offset; + } + + if (found_rhdr) + return offset; + + break; + default: + return offset; + } + + offset += ipv6_optlen(exthdr); + *nexthdr = &exthdr->nexthdr; + exthdr = (struct ipv6_opt_hdr *)(nh + offset); + } + + return offset; +} +#endif + static int xfrm6_hdr_offset(struct xfrm_state *x, struct sk_buff *skb, u8 **prevhdr) { + switch (x->type->proto) { +#if IS_ENABLED(CONFIG_IPV6_MIP6) + case IPPROTO_DSTOPTS: + return mip6_destopt_offset(x, skb, prevhdr); +#endif + default: + break; + } + return x->type->hdr_offset(x, skb, prevhdr); }