Introduce sw acceleration for rx path of IPIP tunnels relying on the netfilter flowtable infrastructure. Subsequent patches will add sw acceleration for IPIP tunnels tx path. This series introduces basic infrastructure to accelerate other tunnel types (e.g. IP6IP6). IPIP rx sw acceleration can be tested running the following scenario where the traffic is forwarded between two NICs (eth0 and eth1) and an IPIP tunnel is used to access a remote site (using eth1 as the underlay device):

ETH0 -- TUN0 <==> ETH1 -- [IP network] -- TUN1 (192.168.100.2)

$ip addr show 6: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000 link/ether 00:00:22:33:11:55 brd ff:ff:ff:ff:ff:ff inet 192.168.0.2/24 scope global eth0 valid_lft forever preferred_lft forever 7: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000 link/ether 00:11:22:33:11:55 brd ff:ff:ff:ff:ff:ff inet 192.168.1.1/24 scope global eth1 valid_lft forever preferred_lft forever 8: tun0@NONE: <POINTOPOINT,NOARP,UP,LOWER_UP> mtu 1480 qdisc noqueue state UNKNOWN group default qlen 1000 link/ipip 192.168.1.1 peer 192.168.1.2 inet 192.168.100.1/24 scope global tun0 valid_lft forever preferred_lft forever

$ip route show default via 192.168.100.2 dev tun0 192.168.0.0/24 dev eth0 proto kernel scope link src 192.168.0.2 192.168.1.0/24 dev eth1 proto kernel scope link src 192.168.1.1 192.168.100.0/24 dev tun0 proto kernel scope link src 192.168.100.1

$nft list ruleset table inet filter { flowtable ft { hook ingress priority filter devices = { eth0, eth1 } }

chain forward { type filter hook forward priority filter; policy accept; meta l4proto { tcp, udp } flow add @ft } }

Reproducing the scenario described above using veths I got the following results: - TCP stream received from the IPIP tunnel: - net-next: (baseline) ~ 71Gbps - net-next + IPIP flowtbale support: ~101Gbps

Signed-off-by: Lorenzo Bianconi lorenzo@kernel.org --- include/linux/netdevice.h | 13 +++++++ include/net/netfilter/nf_flow_table.h | 18 +++++++++ net/ipv4/ipip.c | 25 +++++++++++++ net/netfilter/nf_flow_table_core.c | 3 ++ net/netfilter/nf_flow_table_ip.c | 69 ++++++++++++++++++++++++++++++++--- net/netfilter/nf_flow_table_path.c | 38 +++++++++++++++---- 6 files changed, 153 insertions(+), 13 deletions(-)

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h index 7f5aad5cc9a1994f95ba9037d3a4af27eef9d5e3..0355461960ce3c0db49e00a6f77f48b031a635dc 100644 --- a/include/linux/netdevice.h +++ b/include/linux/netdevice.h @@ -874,6 +874,7 @@ enum net_device_path_type { DEV_PATH_PPPOE, DEV_PATH_DSA, DEV_PATH_MTK_WDMA, + DEV_PATH_TUN, };

struct net_device_path { @@ -885,6 +886,18 @@ struct net_device_path { __be16 proto; u8 h_dest[ETH_ALEN]; } encap; + struct { + union { + struct in_addr src_v4; + struct in6_addr src_v6; + }; + union { + struct in_addr dst_v4; + struct in6_addr dst_v6; + }; + + u8 l3_proto; + } tun; struct { enum { DEV_PATH_BR_VLAN_KEEP, diff --git a/include/net/netfilter/nf_flow_table.h b/include/net/netfilter/nf_flow_table.h index 89cfe72283983ad651a943919ab2141ef082977a..4047075c615e1b64722f98da3b36acf3a2733b64 100644 --- a/include/net/netfilter/nf_flow_table.h +++ b/include/net/netfilter/nf_flow_table.h @@ -107,6 +107,19 @@ enum flow_offload_xmit_type {

#define NF_FLOW_TABLE_ENCAP_MAX 2

+struct flow_offload_tunnel { + union { + struct in_addr src_v4; + struct in6_addr src_v6; + }; + union { + struct in_addr dst_v4; + struct in6_addr dst_v6; + }; + + u8 l3_proto; +}; + struct flow_offload_tuple { union { struct in_addr src_v4; @@ -130,12 +143,15 @@ struct flow_offload_tuple { __be16 proto; } encap[NF_FLOW_TABLE_ENCAP_MAX];

+ struct flow_offload_tunnel tun; + /* All members above are keys for lookups, see flow_offload_hash(). */ struct { } __hash;

u8 dir:2, xmit_type:3, encap_num:2, + tun_num:2, in_vlan_ingress:2; u16 mtu; union { @@ -206,7 +222,9 @@ struct nf_flow_route { u16 id; __be16 proto; } encap[NF_FLOW_TABLE_ENCAP_MAX]; + struct flow_offload_tunnel tun; u8 num_encaps:2, + num_tuns:2, ingress_vlans:2; } in; struct { diff --git a/net/ipv4/ipip.c b/net/ipv4/ipip.c index 3e03af073a1ccc3d7597a998a515b6cfdded40b5..ff95b1b9908e9f4ba4bff207a5bd2c5d5670215a 100644 --- a/net/ipv4/ipip.c +++ b/net/ipv4/ipip.c @@ -353,6 +353,30 @@ ipip_tunnel_ctl(struct net_device *dev, struct ip_tunnel_parm_kern *p, int cmd) return ip_tunnel_ctl(dev, p, cmd); }

+static int ipip_fill_forward_path(struct net_device_path_ctx *ctx, + struct net_device_path *path) +{ + struct ip_tunnel *tunnel = netdev_priv(ctx->dev); + const struct iphdr *tiph = &tunnel->parms.iph; + struct rtable *rt; + + rt = ip_route_output(dev_net(ctx->dev), tiph->daddr, 0, 0, 0, + RT_SCOPE_UNIVERSE); + if (IS_ERR(rt)) + return PTR_ERR(rt); + + path->type = DEV_PATH_TUN; + path->tun.src_v4.s_addr = tiph->saddr; + path->tun.dst_v4.s_addr = tiph->daddr; + path->tun.l3_proto = IPPROTO_IPIP; + path->dev = ctx->dev; + + ctx->dev = rt->dst.dev; + ip_rt_put(rt); + + return 0; +} + static const struct net_device_ops ipip_netdev_ops = { .ndo_init = ipip_tunnel_init, .ndo_uninit = ip_tunnel_uninit, @@ -362,6 +386,7 @@ static const struct net_device_ops ipip_netdev_ops = { .ndo_get_stats64 = dev_get_tstats64, .ndo_get_iflink = ip_tunnel_get_iflink, .ndo_tunnel_ctl = ipip_tunnel_ctl, + .ndo_fill_forward_path = ipip_fill_forward_path, };

#define IPIP_FEATURES (NETIF_F_SG | \ diff --git a/net/netfilter/nf_flow_table_core.c b/net/netfilter/nf_flow_table_core.c index 6c6a5165f9933b130e772c096a01d3fcb1d61c94..06e8251a6644e2335117ae3720b9ebf159eb2264 100644 --- a/net/netfilter/nf_flow_table_core.c +++ b/net/netfilter/nf_flow_table_core.c @@ -118,7 +118,10 @@ static int flow_offload_fill_route(struct flow_offload *flow, flow_tuple->in_vlan_ingress |= BIT(j); j++; } + + flow_tuple->tun = route->tuple[dir].in.tun; flow_tuple->encap_num = route->tuple[dir].in.num_encaps; + flow_tuple->tun_num = route->tuple[dir].in.num_tuns;

switch (route->tuple[dir].xmit_type) { case FLOW_OFFLOAD_XMIT_DIRECT: diff --git a/net/netfilter/nf_flow_table_ip.c b/net/netfilter/nf_flow_table_ip.c index be21600cff5390202f5451cd76c4e2afc6f8bc00..b40080b0d71cc011e18b68201af33e9c84987d78 100644 --- a/net/netfilter/nf_flow_table_ip.c +++ b/net/netfilter/nf_flow_table_ip.c @@ -145,8 +145,11 @@ static bool ip_has_options(unsigned int thoff) static void nf_flow_tuple_encap(struct sk_buff *skb, struct flow_offload_tuple *tuple) { + __be16 inner_proto = skb->protocol; struct vlan_ethhdr *veth; struct pppoe_hdr *phdr; + struct iphdr *iph; + u16 offset = 0; int i = 0;

if (skb_vlan_tag_present(skb)) { @@ -159,13 +162,26 @@ static void nf_flow_tuple_encap(struct sk_buff *skb, veth = (struct vlan_ethhdr *)skb_mac_header(skb); tuple->encap[i].id = ntohs(veth->h_vlan_TCI); tuple->encap[i].proto = skb->protocol; + inner_proto = veth->h_vlan_encapsulated_proto; + offset += VLAN_HLEN; break; case htons(ETH_P_PPP_SES): phdr = (struct pppoe_hdr *)skb_network_header(skb); tuple->encap[i].id = ntohs(phdr->sid); tuple->encap[i].proto = skb->protocol; + inner_proto = *((__be16 *)(phdr + 1)); + offset += PPPOE_SES_HLEN; break; } + + if (inner_proto == htons(ETH_P_IP)) { + iph = (struct iphdr *)(skb_network_header(skb) + offset); + if (iph->protocol == IPPROTO_IPIP) { + tuple->tun.dst_v4.s_addr = iph->daddr; + tuple->tun.src_v4.s_addr = iph->saddr; + tuple->tun.l3_proto = IPPROTO_IPIP; + } + } }

struct nf_flowtable_ctx { @@ -277,11 +293,46 @@ static unsigned int nf_flow_xmit_xfrm(struct sk_buff *skb, return NF_STOLEN; }

+static bool nf_flow_ip4_encap_proto(struct sk_buff *skb, u32 *psize) +{ + struct iphdr *iph; + u16 size; + + if (!pskb_may_pull(skb, sizeof(*iph) + *psize)) + return false; + + iph = (struct iphdr *)(skb_network_header(skb) + *psize); + size = iph->ihl << 2; + + if (ip_is_fragment(iph) || unlikely(ip_has_options(size))) + return false; + + if (iph->ttl <= 1) + return false; + + if (iph->protocol == IPPROTO_IPIP) + *psize += size; + + return true; +} + +static void nf_flow_ip4_encap_pop(struct sk_buff *skb) +{ + struct iphdr *iph = (struct iphdr *)skb_network_header(skb); + + if (iph->protocol != IPPROTO_IPIP) + return; + + skb_pull(skb, iph->ihl << 2); + skb_reset_network_header(skb); +} + static bool nf_flow_skb_encap_protocol(struct sk_buff *skb, __be16 proto, u32 *offset) { + __be16 inner_proto = skb->protocol; struct vlan_ethhdr *veth; - __be16 inner_proto; + bool ret = false;

switch (skb->protocol) { case htons(ETH_P_8021Q): @@ -291,19 +342,23 @@ static bool nf_flow_skb_encap_protocol(struct sk_buff *skb, __be16 proto, veth = (struct vlan_ethhdr *)skb_mac_header(skb); if (veth->h_vlan_encapsulated_proto == proto) { *offset += VLAN_HLEN; - return true; + inner_proto = proto; + ret = true; } break; case htons(ETH_P_PPP_SES): if (nf_flow_pppoe_proto(skb, &inner_proto) && inner_proto == proto) { *offset += PPPOE_SES_HLEN; - return true; + ret = true; } break; }

- return false; + if (inner_proto == htons(ETH_P_IP)) + ret = nf_flow_ip4_encap_proto(skb, offset); + + return ret; }

static void nf_flow_encap_pop(struct sk_buff *skb, @@ -331,6 +386,9 @@ static void nf_flow_encap_pop(struct sk_buff *skb, break; } } + + if (skb->protocol == htons(ETH_P_IP)) + nf_flow_ip4_encap_pop(skb); }

struct nf_flow_xmit { @@ -356,8 +414,7 @@ nf_flow_offload_lookup(struct nf_flowtable_ctx *ctx, { struct flow_offload_tuple tuple = {};

- if (skb->protocol != htons(ETH_P_IP) && - !nf_flow_skb_encap_protocol(skb, htons(ETH_P_IP), &ctx->offset)) + if (!nf_flow_skb_encap_protocol(skb, htons(ETH_P_IP), &ctx->offset)) return NULL;

if (nf_flow_tuple_ip(ctx, skb, &tuple) < 0) diff --git a/net/netfilter/nf_flow_table_path.c b/net/netfilter/nf_flow_table_path.c index 50b2b7d0c579ec0855f5870d1e1f7d6f74db0e8f..64e2672a3c3383bae896c4fb68ff9ab7489fe791 100644 --- a/net/netfilter/nf_flow_table_path.c +++ b/net/netfilter/nf_flow_table_path.c @@ -80,6 +80,8 @@ struct nft_forward_info { __be16 proto; } encap[NF_FLOW_TABLE_ENCAP_MAX]; u8 num_encaps; + struct flow_offload_tunnel tun; + u8 num_tuns; u8 ingress_vlans; u8 h_source[ETH_ALEN]; u8 h_dest[ETH_ALEN]; @@ -102,6 +104,7 @@ static void nft_dev_path_info(const struct net_device_path_stack *stack, case DEV_PATH_DSA: case DEV_PATH_VLAN: case DEV_PATH_PPPOE: + case DEV_PATH_TUN: info->indev = path->dev; if (is_zero_ether_addr(info->h_source)) memcpy(info->h_source, path->dev->dev_addr, ETH_ALEN); @@ -113,14 +116,27 @@ static void nft_dev_path_info(const struct net_device_path_stack *stack, break; }

- /* DEV_PATH_VLAN and DEV_PATH_PPPOE */ - if (info->num_encaps >= NF_FLOW_TABLE_ENCAP_MAX) { - info->indev = NULL; - break; + /* DEV_PATH_VLAN, DEV_PATH_PPPOE and DEV_PATH_TUN */ + if (path->type == DEV_PATH_TUN) { + if (info->num_tuns) { + info->indev = NULL; + break; + } + info->tun.src_v6 = path->tun.src_v6; + info->tun.dst_v6 = path->tun.dst_v6; + info->tun.l3_proto = path->tun.l3_proto; + info->num_tuns++; + } else { + if (info->num_encaps >= NF_FLOW_TABLE_ENCAP_MAX) { + info->indev = NULL; + break; + } + info->encap[info->num_encaps].id = + path->encap.id; + info->encap[info->num_encaps].proto = + path->encap.proto; + info->num_encaps++; } - info->encap[info->num_encaps].id = path->encap.id; - info->encap[info->num_encaps].proto = path->encap.proto; - info->num_encaps++; if (path->type == DEV_PATH_PPPOE) memcpy(info->h_dest, path->encap.h_dest, ETH_ALEN); break; @@ -196,6 +212,14 @@ static void nft_dev_forward_path(struct nf_flow_route *route, route->tuple[!dir].in.encap[i].id = info.encap[i].id; route->tuple[!dir].in.encap[i].proto = info.encap[i].proto; } + + if (info.num_tuns) { + route->tuple[!dir].in.tun.src_v6 = info.tun.dst_v6; + route->tuple[!dir].in.tun.dst_v6 = info.tun.src_v6; + route->tuple[!dir].in.tun.l3_proto = info.tun.l3_proto; + route->tuple[!dir].in.num_tuns = info.num_tuns; + } + route->tuple[!dir].in.num_encaps = info.num_encaps; route->tuple[!dir].in.ingress_vlans = info.ingress_vlans; route->tuple[dir].out.ifindex = info.outdev->ifindex;

Introduce specific selftest for IPIP flowtable SW acceleration in nft_flowtable.sh

Signed-off-by: Lorenzo Bianconi lorenzo@kernel.org --- .../selftests/net/netfilter/nft_flowtable.sh | 69 ++++++++++++++++++++++ 1 file changed, 69 insertions(+)

diff --git a/tools/testing/selftests/net/netfilter/nft_flowtable.sh b/tools/testing/selftests/net/netfilter/nft_flowtable.sh index 45832df982950c2164dcb6637497870f0d3daefe..1fbfc8ad8dcdc5db2ab1a1ea9310f655d09eee83 100755 --- a/tools/testing/selftests/net/netfilter/nft_flowtable.sh +++ b/tools/testing/selftests/net/netfilter/nft_flowtable.sh @@ -558,6 +558,73 @@ if ! test_tcp_forwarding_nat "$ns1" "$ns2" 1 ""; then ip netns exec "$nsr1" nft list ruleset fi

+# IPIP tunnel test: +# Add IPIP tunnel interfaces and check flowtable acceleration. +test_ipip() { +if ! ip -net "$nsr1" link add name tun0 type ipip \ + local 192.168.10.1 remote 192.168.10.2 >/dev/null;then + echo "SKIP: could not add ipip tunnel" + [ "$ret" -eq 0 ] && ret=$ksft_skip + return +fi +ip -net "$nsr1" link set tun0 up +ip -net "$nsr1" addr add 192.168.100.1/24 dev tun0 +ip netns exec "$nsr1" sysctl net.ipv4.conf.tun0.forwarding=1 > /dev/null + +ip -net "$nsr2" link add name tun0 type ipip local 192.168.10.2 remote 192.168.10.1 +ip -net "$nsr2" link set tun0 up +ip -net "$nsr2" addr add 192.168.100.2/24 dev tun0 +ip netns exec "$nsr2" sysctl net.ipv4.conf.tun0.forwarding=1 > /dev/null + +ip -net "$nsr1" route change default via 192.168.100.2 +ip -net "$nsr2" route change default via 192.168.100.1 +ip -net "$ns2" route add default via 10.0.2.1 + +ip netns exec "$nsr1" nft -a insert rule inet filter forward 'meta oif tun0 accept' +ip netns exec "$nsr1" nft -a insert rule inet filter forward \ + 'meta oif "veth0" tcp sport 12345 ct mark set 1 flow add @f1 counter name routed_repl accept' + +if ! test_tcp_forwarding_nat "$ns1" "$ns2" 1 "IPIP tunnel"; then + echo "FAIL: flow offload for ns1/ns2 with IPIP tunnel" 1>&2 + ip netns exec "$nsr1" nft list ruleset + ret=1 +fi + +# Create vlan tagged devices for IPIP traffic. +ip -net "$nsr1" link add link veth1 name veth1.10 type vlan id 10 +ip -net "$nsr1" link set veth1.10 up +ip -net "$nsr1" addr add 192.168.20.1/24 dev veth1.10 +ip netns exec "$nsr1" sysctl net.ipv4.conf.veth1/10.forwarding=1 > /dev/null +ip netns exec "$nsr1" nft -a insert rule inet filter forward 'meta oif veth1.10 accept' +ip -net "$nsr1" link add name tun1 type ipip local 192.168.20.1 remote 192.168.20.2 +ip -net "$nsr1" link set tun1 up +ip -net "$nsr1" addr add 192.168.200.1/24 dev tun1 +ip -net "$nsr1" route change default via 192.168.200.2 +ip netns exec "$nsr1" sysctl net.ipv4.conf.tun1.forwarding=1 > /dev/null +ip netns exec "$nsr1" nft -a insert rule inet filter forward 'meta oif tun1 accept' + +ip -net "$nsr2" link add link veth0 name veth0.10 type vlan id 10 +ip -net "$nsr2" link set veth0.10 up +ip -net "$nsr2" addr add 192.168.20.2/24 dev veth0.10 +ip netns exec "$nsr2" sysctl net.ipv4.conf.veth0/10.forwarding=1 > /dev/null +ip -net "$nsr2" link add name tun1 type ipip local 192.168.20.2 remote 192.168.20.1 +ip -net "$nsr2" link set tun1 up +ip -net "$nsr2" addr add 192.168.200.2/24 dev tun1 +ip -net "$nsr2" route change default via 192.168.200.1 +ip netns exec "$nsr2" sysctl net.ipv4.conf.tun1.forwarding=1 > /dev/null + +if ! test_tcp_forwarding_nat "$ns1" "$ns2" 1 "IPIP tunnel over vlan"; then + echo "FAIL: flow offload for ns1/ns2 with IPIP tunnel over vlan" 1>&2 + ip netns exec "$nsr1" nft list ruleset + ret=1 +fi + +# Restore the previous configuration +ip -net "$nsr1" route change default via 192.168.10.2 +ip -net "$nsr2" route change default via 192.168.10.1 +ip -net "$ns2" route del default via 10.0.2.1 +} + # Another test: # Add bridge interface br0 to Router1, with NAT enabled. test_bridge() { @@ -643,6 +710,8 @@ ip -net "$nsr1" addr add dead:1::1/64 dev veth0 nodad ip -net "$nsr1" link set up dev veth0 }

+test_ipip + test_bridge

KEY_SHA="0x"$(ps -af | sha1sum | cut -d " " -f 1)