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[2001:1c00:20d:1300:1b1c:4449:176a:89ea]) by smtp.gmail.com with ESMTPSA id 4fb4d7f45d1cf-5f1549b3fd0sm2236164a12.35.2025.04.08.07.28.25 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 08 Apr 2025 07:28:25 -0700 (PDT) From: Eric Woudstra To: "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Simon Horman , Andrew Lunn , Pablo Neira Ayuso , Jozsef Kadlecsik , Nikolay Aleksandrov , Ido Schimmel , Kuniyuki Iwashima , Stanislav Fomichev , Ahmed Zaki , Alexander Lobakin Cc: netdev@vger.kernel.org, netfilter-devel@vger.kernel.org, bridge@lists.linux.dev, Eric Woudstra Subject: [PATCH v11 nf-next 6/6] netfilter: nft_flow_offload: Add bridgeflow to nft_flow_offload_eval() Date: Tue, 8 Apr 2025 16:28:02 +0200 Message-ID: <20250408142802.96101-7-ericwouds@gmail.com> X-Mailer: git-send-email 2.47.1 In-Reply-To: <20250408142802.96101-1-ericwouds@gmail.com> References: <20250408142802.96101-1-ericwouds@gmail.com> Precedence: bulk X-Mailing-List: bridge@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Edit nft_flow_offload_eval() to make it possible to handle a flowtable of the nft bridge family. Use nft_flow_offload_bridge_init() to fill the flow tuples. It uses nft_dev_fill_bridge_path() in each direction. Signed-off-by: Eric Woudstra --- net/netfilter/nft_flow_offload.c | 148 +++++++++++++++++++++++++++++-- 1 file changed, 143 insertions(+), 5 deletions(-) diff --git a/net/netfilter/nft_flow_offload.c b/net/netfilter/nft_flow_offload.c index 889393edc629..05294955881e 100644 --- a/net/netfilter/nft_flow_offload.c +++ b/net/netfilter/nft_flow_offload.c @@ -195,6 +195,134 @@ static bool nft_flowtable_find_dev(const struct net_device *dev, return found; } +static int nft_dev_fill_bridge_path(struct flow_offload *flow, + struct nft_flowtable *ft, + enum ip_conntrack_dir dir, + const struct net_device *src_dev, + const struct net_device *dst_dev, + unsigned char *src_ha, + unsigned char *dst_ha) +{ + struct flow_offload_tuple_rhash *th = flow->tuplehash; + struct net_device_path_ctx ctx = {}; + struct net_device_path_stack stack; + struct nft_forward_info info = {}; + int i, j = 0; + + for (i = th[dir].tuple.encap_num - 1; i >= 0 ; i--) { + if (info.num_encaps >= NF_FLOW_TABLE_ENCAP_MAX) + return -1; + + if (th[dir].tuple.in_vlan_ingress & BIT(i)) + continue; + + info.encap[info.num_encaps].id = th[dir].tuple.encap[i].id; + info.encap[info.num_encaps].proto = th[dir].tuple.encap[i].proto; + info.num_encaps++; + + if (th[dir].tuple.encap[i].proto == htons(ETH_P_PPP_SES)) + continue; + + if (ctx.num_vlans >= NET_DEVICE_PATH_VLAN_MAX) + return -1; + ctx.vlan[ctx.num_vlans].id = th[dir].tuple.encap[i].id; + ctx.vlan[ctx.num_vlans].proto = th[dir].tuple.encap[i].proto; + ctx.num_vlans++; + } + ctx.dev = src_dev; + ether_addr_copy(ctx.daddr, dst_ha); + + if (dev_fill_bridge_path(&ctx, &stack) < 0) + return -1; + + nft_dev_path_info(&stack, &info, dst_ha, &ft->data); + + if (!info.indev || info.indev != dst_dev) + return -1; + + th[!dir].tuple.iifidx = info.indev->ifindex; + for (i = info.num_encaps - 1; i >= 0; i--) { + th[!dir].tuple.encap[j].id = info.encap[i].id; + th[!dir].tuple.encap[j].proto = info.encap[i].proto; + if (info.ingress_vlans & BIT(i)) + th[!dir].tuple.in_vlan_ingress |= BIT(j); + j++; + } + th[!dir].tuple.encap_num = info.num_encaps; + + th[dir].tuple.mtu = dst_dev->mtu; + ether_addr_copy(th[dir].tuple.out.h_source, src_ha); + ether_addr_copy(th[dir].tuple.out.h_dest, dst_ha); + th[dir].tuple.out.ifidx = info.outdev->ifindex; + th[dir].tuple.out.hw_ifidx = info.hw_outdev->ifindex; + th[dir].tuple.out.bridge_vid = info.bridge_vid; + th[dir].tuple.xmit_type = FLOW_OFFLOAD_XMIT_DIRECT; + + return 0; +} + +static int nft_flow_offload_bridge_init(struct flow_offload *flow, + const struct nft_pktinfo *pkt, + enum ip_conntrack_dir dir, + struct nft_flowtable *ft) +{ + const struct net_device *in_dev, *out_dev; + struct ethhdr *eth = eth_hdr(pkt->skb); + struct flow_offload_tuple *tuple; + int err, i = 0; + + in_dev = nft_in(pkt); + if (!in_dev || !nft_flowtable_find_dev(in_dev, ft)) + return -1; + + out_dev = nft_out(pkt); + if (!out_dev || !nft_flowtable_find_dev(out_dev, ft)) + return -1; + + tuple = &flow->tuplehash[!dir].tuple; + + if (skb_vlan_tag_present(pkt->skb)) { + tuple->encap[i].id = skb_vlan_tag_get(pkt->skb); + tuple->encap[i].proto = pkt->skb->vlan_proto; + i++; + } + + switch (eth_hdr(pkt->skb)->h_proto) { + case htons(ETH_P_8021Q): { + struct vlan_hdr *vhdr = (struct vlan_hdr *)(skb_mac_header(pkt->skb) + + sizeof(struct ethhdr)); + tuple->encap[i].id = ntohs(vhdr->h_vlan_TCI); + tuple->encap[i].proto = htons(ETH_P_8021Q); + i++; + break; + } + case htons(ETH_P_PPP_SES): { + struct pppoe_hdr *phdr = (struct pppoe_hdr *)(skb_mac_header(pkt->skb) + + sizeof(struct ethhdr)); + + tuple->encap[i].id = ntohs(phdr->sid); + tuple->encap[i].proto = htons(ETH_P_PPP_SES); + i++; + break; + } + } + tuple->encap_num = i; + + err = nft_dev_fill_bridge_path(flow, ft, !dir, out_dev, in_dev, + eth->h_dest, eth->h_source); + if (err < 0) + return err; + + memset(tuple->encap, 0, sizeof(tuple->encap)); + + err = nft_dev_fill_bridge_path(flow, ft, dir, in_dev, out_dev, + eth->h_source, eth->h_dest); + if (err < 0) + return err; + + return 0; +} + static void nft_dev_forward_path(struct nf_flow_route *route, const struct nf_conn *ct, enum ip_conntrack_dir dir, @@ -315,6 +443,7 @@ static void nft_flow_offload_eval(const struct nft_expr *expr, { struct nft_flow_offload *priv = nft_expr_priv(expr); struct nf_flowtable *flowtable = &priv->flowtable->data; + bool routing = flowtable->type->family != NFPROTO_BRIDGE; struct tcphdr _tcph, *tcph = NULL; struct nf_flow_route route = {}; enum ip_conntrack_info ctinfo; @@ -368,14 +497,21 @@ static void nft_flow_offload_eval(const struct nft_expr *expr, goto out; dir = CTINFO2DIR(ctinfo); - if (nft_flow_route(pkt, ct, &route, dir, priv->flowtable) < 0) - goto err_flow_route; + if (routing) { + if (nft_flow_route(pkt, ct, &route, dir, priv->flowtable) < 0) + goto err_flow_route; + } flow = flow_offload_alloc(ct); if (!flow) goto err_flow_alloc; - flow_offload_route_init(flow, &route); + if (routing) + flow_offload_route_init(flow, &route); + else + if (nft_flow_offload_bridge_init(flow, pkt, dir, priv->flowtable) < 0) + goto err_flow_add; + if (tcph) flow_offload_ct_tcp(ct); @@ -423,8 +559,10 @@ static void nft_flow_offload_eval(const struct nft_expr *expr, err_flow_add: flow_offload_free(flow); err_flow_alloc: - dst_release(route.tuple[dir].dst); - dst_release(route.tuple[!dir].dst); + if (routing) { + dst_release(route.tuple[dir].dst); + dst_release(route.tuple[!dir].dst); + } err_flow_route: clear_bit(IPS_OFFLOAD_BIT, &ct->status); out: -- 2.47.1