From patchwork Tue Mar 15 09:15:11 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Pablo Neira Ayuso X-Patchwork-Id: 12781209 X-Patchwork-Delegate: kuba@kernel.org 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 8C49BC4332F for ; Tue, 15 Mar 2022 09:15:25 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1346409AbiCOJQf (ORCPT ); Tue, 15 Mar 2022 05:16:35 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40998 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1346265AbiCOJQd (ORCPT ); Tue, 15 Mar 2022 05:16:33 -0400 Received: from mail.netfilter.org (mail.netfilter.org [217.70.188.207]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 984A64DF67; Tue, 15 Mar 2022 02:15:21 -0700 (PDT) Received: from localhost.localdomain (unknown [78.30.32.163]) by mail.netfilter.org (Postfix) with ESMTPSA id 650E263014; Tue, 15 Mar 2022 10:13:02 +0100 (CET) From: Pablo Neira Ayuso To: netfilter-devel@vger.kernel.org Cc: davem@davemloft.net, netdev@vger.kernel.org, kuba@kernel.org Subject: [PATCH nf-next 4/6] act_ct: Support GRE offload Date: Tue, 15 Mar 2022 10:15:11 +0100 Message-Id: <20220315091513.66544-5-pablo@netfilter.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20220315091513.66544-1-pablo@netfilter.org> References: <20220315091513.66544-1-pablo@netfilter.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org From: Toshiaki Makita Support GREv0 without NAT. Signed-off-by: Toshiaki Makita Acked-by: Paul Blakey Signed-off-by: Pablo Neira Ayuso --- net/sched/act_ct.c | 115 +++++++++++++++++++++++++++++++++++---------- 1 file changed, 91 insertions(+), 24 deletions(-) diff --git a/net/sched/act_ct.c b/net/sched/act_ct.c index 5234e8bcc764..bed0b100dd0c 100644 --- a/net/sched/act_ct.c +++ b/net/sched/act_ct.c @@ -415,6 +415,19 @@ static void tcf_ct_flow_table_process_conn(struct tcf_ct_flow_table *ct_ft, break; case IPPROTO_UDP: break; +#ifdef CONFIG_NF_CT_PROTO_GRE + case IPPROTO_GRE: { + struct nf_conntrack_tuple *tuple; + + if (ct->status & IPS_NAT_MASK) + return; + tuple = &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple; + /* No support for GRE v1 */ + if (tuple->src.u.gre.key || tuple->dst.u.gre.key) + return; + break; + } +#endif default: return; } @@ -434,6 +447,8 @@ tcf_ct_flow_table_fill_tuple_ipv4(struct sk_buff *skb, struct flow_ports *ports; unsigned int thoff; struct iphdr *iph; + size_t hdrsize; + u8 ipproto; if (!pskb_network_may_pull(skb, sizeof(*iph))) return false; @@ -445,29 +460,54 @@ tcf_ct_flow_table_fill_tuple_ipv4(struct sk_buff *skb, unlikely(thoff != sizeof(struct iphdr))) return false; - if (iph->protocol != IPPROTO_TCP && - iph->protocol != IPPROTO_UDP) + ipproto = iph->protocol; + switch (ipproto) { + case IPPROTO_TCP: + hdrsize = sizeof(struct tcphdr); + break; + case IPPROTO_UDP: + hdrsize = sizeof(*ports); + break; +#ifdef CONFIG_NF_CT_PROTO_GRE + case IPPROTO_GRE: + hdrsize = sizeof(struct gre_base_hdr); + break; +#endif + default: return false; + } if (iph->ttl <= 1) return false; - if (!pskb_network_may_pull(skb, iph->protocol == IPPROTO_TCP ? - thoff + sizeof(struct tcphdr) : - thoff + sizeof(*ports))) + if (!pskb_network_may_pull(skb, thoff + hdrsize)) return false; - iph = ip_hdr(skb); - if (iph->protocol == IPPROTO_TCP) + switch (ipproto) { + case IPPROTO_TCP: *tcph = (void *)(skb_network_header(skb) + thoff); + fallthrough; + case IPPROTO_UDP: + ports = (struct flow_ports *)(skb_network_header(skb) + thoff); + tuple->src_port = ports->source; + tuple->dst_port = ports->dest; + break; + case IPPROTO_GRE: { + struct gre_base_hdr *greh; + + greh = (struct gre_base_hdr *)(skb_network_header(skb) + thoff); + if ((greh->flags & GRE_VERSION) != GRE_VERSION_0) + return false; + break; + } + } + + iph = ip_hdr(skb); - ports = (struct flow_ports *)(skb_network_header(skb) + thoff); tuple->src_v4.s_addr = iph->saddr; tuple->dst_v4.s_addr = iph->daddr; - tuple->src_port = ports->source; - tuple->dst_port = ports->dest; tuple->l3proto = AF_INET; - tuple->l4proto = iph->protocol; + tuple->l4proto = ipproto; return true; } @@ -480,36 +520,63 @@ tcf_ct_flow_table_fill_tuple_ipv6(struct sk_buff *skb, struct flow_ports *ports; struct ipv6hdr *ip6h; unsigned int thoff; + size_t hdrsize; + u8 nexthdr; if (!pskb_network_may_pull(skb, sizeof(*ip6h))) return false; ip6h = ipv6_hdr(skb); + thoff = sizeof(*ip6h); - if (ip6h->nexthdr != IPPROTO_TCP && - ip6h->nexthdr != IPPROTO_UDP) - return false; + nexthdr = ip6h->nexthdr; + switch (nexthdr) { + case IPPROTO_TCP: + hdrsize = sizeof(struct tcphdr); + break; + case IPPROTO_UDP: + hdrsize = sizeof(*ports); + break; +#ifdef CONFIG_NF_CT_PROTO_GRE + case IPPROTO_GRE: + hdrsize = sizeof(struct gre_base_hdr); + break; +#endif + default: + return -1; + } if (ip6h->hop_limit <= 1) return false; - thoff = sizeof(*ip6h); - if (!pskb_network_may_pull(skb, ip6h->nexthdr == IPPROTO_TCP ? - thoff + sizeof(struct tcphdr) : - thoff + sizeof(*ports))) + if (!pskb_network_may_pull(skb, thoff + hdrsize)) return false; - ip6h = ipv6_hdr(skb); - if (ip6h->nexthdr == IPPROTO_TCP) + switch (nexthdr) { + case IPPROTO_TCP: *tcph = (void *)(skb_network_header(skb) + thoff); + fallthrough; + case IPPROTO_UDP: + ports = (struct flow_ports *)(skb_network_header(skb) + thoff); + tuple->src_port = ports->source; + tuple->dst_port = ports->dest; + break; + case IPPROTO_GRE: { + struct gre_base_hdr *greh; + + greh = (struct gre_base_hdr *)(skb_network_header(skb) + thoff); + if ((greh->flags & GRE_VERSION) != GRE_VERSION_0) + return false; + break; + } + } + + ip6h = ipv6_hdr(skb); - ports = (struct flow_ports *)(skb_network_header(skb) + thoff); tuple->src_v6 = ip6h->saddr; tuple->dst_v6 = ip6h->daddr; - tuple->src_port = ports->source; - tuple->dst_port = ports->dest; tuple->l3proto = AF_INET6; - tuple->l4proto = ip6h->nexthdr; + tuple->l4proto = nexthdr; return true; }