struct flow_offload *flow_offload_alloc(struct nf_conn *ct);
void flow_offload_free(struct flow_offload *flow);
+struct nft_flowtable;
+struct nft_pktinfo;
+int nft_flow_route(const struct nft_pktinfo *pkt, const struct nf_conn *ct,
+ struct nf_flow_route *route, enum ip_conntrack_dir dir,
+ struct nft_flowtable *ft);
+
static inline int
nf_flow_table_offload_add_cb(struct nf_flowtable *flow_table,
flow_setup_cb_t *cb, void *cb_priv)
# flow table infrastructure
obj-$(CONFIG_NF_FLOW_TABLE) += nf_flow_table.o
nf_flow_table-objs := nf_flow_table_core.o nf_flow_table_ip.o \
+ nf_flow_table_path.o \
nf_flow_table_offload.o nf_flow_table_xdp.o
nf_flow_table-$(CONFIG_NF_FLOW_TABLE_PROCFS) += nf_flow_table_procfs.o
ifeq ($(CONFIG_NF_FLOW_TABLE),m)
--- /dev/null
+// SPDX-License-Identifier: GPL-2.0-only
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/netlink.h>
+#include <linux/netfilter.h>
+#include <linux/spinlock.h>
+#include <linux/netfilter/nf_conntrack_common.h>
+#include <linux/netfilter/nf_tables.h>
+#include <net/ip.h>
+#include <net/inet_dscp.h>
+#include <net/netfilter/nf_tables.h>
+#include <net/netfilter/nf_tables_core.h>
+#include <net/netfilter/nf_conntrack_core.h>
+#include <net/netfilter/nf_conntrack_extend.h>
+#include <net/netfilter/nf_flow_table.h>
+
+static enum flow_offload_xmit_type nft_xmit_type(struct dst_entry *dst)
+{
+ if (dst_xfrm(dst))
+ return FLOW_OFFLOAD_XMIT_XFRM;
+
+ return FLOW_OFFLOAD_XMIT_NEIGH;
+}
+
+static void nft_default_forward_path(struct nf_flow_route *route,
+ struct dst_entry *dst_cache,
+ enum ip_conntrack_dir dir)
+{
+ route->tuple[!dir].in.ifindex = dst_cache->dev->ifindex;
+ route->tuple[dir].dst = dst_cache;
+ route->tuple[dir].xmit_type = nft_xmit_type(dst_cache);
+}
+
+static bool nft_is_valid_ether_device(const struct net_device *dev)
+{
+ if (!dev || (dev->flags & IFF_LOOPBACK) || dev->type != ARPHRD_ETHER ||
+ dev->addr_len != ETH_ALEN || !is_valid_ether_addr(dev->dev_addr))
+ return false;
+
+ return true;
+}
+
+static int nft_dev_fill_forward_path(const struct nf_flow_route *route,
+ const struct dst_entry *dst_cache,
+ const struct nf_conn *ct,
+ enum ip_conntrack_dir dir, u8 *ha,
+ struct net_device_path_stack *stack)
+{
+ const void *daddr = &ct->tuplehash[!dir].tuple.src.u3;
+ struct net_device *dev = dst_cache->dev;
+ struct neighbour *n;
+ u8 nud_state;
+
+ if (!nft_is_valid_ether_device(dev))
+ goto out;
+
+ n = dst_neigh_lookup(dst_cache, daddr);
+ if (!n)
+ return -1;
+
+ read_lock_bh(&n->lock);
+ nud_state = n->nud_state;
+ ether_addr_copy(ha, n->ha);
+ read_unlock_bh(&n->lock);
+ neigh_release(n);
+
+ if (!(nud_state & NUD_VALID))
+ return -1;
+
+out:
+ return dev_fill_forward_path(dev, ha, stack);
+}
+
+struct nft_forward_info {
+ const struct net_device *indev;
+ const struct net_device *outdev;
+ const struct net_device *hw_outdev;
+ struct id {
+ __u16 id;
+ __be16 proto;
+ } encap[NF_FLOW_TABLE_ENCAP_MAX];
+ u8 num_encaps;
+ u8 ingress_vlans;
+ u8 h_source[ETH_ALEN];
+ u8 h_dest[ETH_ALEN];
+ enum flow_offload_xmit_type xmit_type;
+};
+
+static void nft_dev_path_info(const struct net_device_path_stack *stack,
+ struct nft_forward_info *info,
+ unsigned char *ha, struct nf_flowtable *flowtable)
+{
+ const struct net_device_path *path;
+ int i;
+
+ memcpy(info->h_dest, ha, ETH_ALEN);
+
+ for (i = 0; i < stack->num_paths; i++) {
+ path = &stack->path[i];
+ switch (path->type) {
+ case DEV_PATH_ETHERNET:
+ case DEV_PATH_DSA:
+ case DEV_PATH_VLAN:
+ case DEV_PATH_PPPOE:
+ info->indev = path->dev;
+ if (is_zero_ether_addr(info->h_source))
+ memcpy(info->h_source, path->dev->dev_addr, ETH_ALEN);
+
+ if (path->type == DEV_PATH_ETHERNET)
+ break;
+ if (path->type == DEV_PATH_DSA) {
+ i = stack->num_paths;
+ break;
+ }
+
+ /* DEV_PATH_VLAN and DEV_PATH_PPPOE */
+ if (info->num_encaps >= NF_FLOW_TABLE_ENCAP_MAX) {
+ info->indev = NULL;
+ break;
+ }
+ if (!info->outdev)
+ info->outdev = path->dev;
+ 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;
+ case DEV_PATH_BRIDGE:
+ if (is_zero_ether_addr(info->h_source))
+ memcpy(info->h_source, path->dev->dev_addr, ETH_ALEN);
+
+ switch (path->bridge.vlan_mode) {
+ case DEV_PATH_BR_VLAN_UNTAG_HW:
+ info->ingress_vlans |= BIT(info->num_encaps - 1);
+ break;
+ case DEV_PATH_BR_VLAN_TAG:
+ if (info->num_encaps >= NF_FLOW_TABLE_ENCAP_MAX) {
+ info->indev = NULL;
+ break;
+ }
+ info->encap[info->num_encaps].id = path->bridge.vlan_id;
+ info->encap[info->num_encaps].proto = path->bridge.vlan_proto;
+ info->num_encaps++;
+ break;
+ case DEV_PATH_BR_VLAN_UNTAG:
+ if (WARN_ON_ONCE(info->num_encaps-- == 0)) {
+ info->indev = NULL;
+ break;
+ }
+ break;
+ case DEV_PATH_BR_VLAN_KEEP:
+ break;
+ }
+ info->xmit_type = FLOW_OFFLOAD_XMIT_DIRECT;
+ break;
+ default:
+ info->indev = NULL;
+ break;
+ }
+ }
+ if (!info->outdev)
+ info->outdev = info->indev;
+
+ info->hw_outdev = info->indev;
+
+ if (nf_flowtable_hw_offload(flowtable) &&
+ nft_is_valid_ether_device(info->indev))
+ info->xmit_type = FLOW_OFFLOAD_XMIT_DIRECT;
+}
+
+static bool nft_flowtable_find_dev(const struct net_device *dev,
+ struct nft_flowtable *ft)
+{
+ struct nft_hook *hook;
+ bool found = false;
+
+ list_for_each_entry_rcu(hook, &ft->hook_list, list) {
+ if (!nft_hook_find_ops_rcu(hook, dev))
+ continue;
+
+ found = true;
+ break;
+ }
+
+ return found;
+}
+
+static void nft_dev_forward_path(struct nf_flow_route *route,
+ const struct nf_conn *ct,
+ enum ip_conntrack_dir dir,
+ struct nft_flowtable *ft)
+{
+ const struct dst_entry *dst = route->tuple[dir].dst;
+ struct net_device_path_stack stack;
+ struct nft_forward_info info = {};
+ unsigned char ha[ETH_ALEN];
+ int i;
+
+ if (nft_dev_fill_forward_path(route, dst, ct, dir, ha, &stack) >= 0)
+ nft_dev_path_info(&stack, &info, ha, &ft->data);
+
+ if (!info.indev || !nft_flowtable_find_dev(info.indev, ft))
+ return;
+
+ route->tuple[!dir].in.ifindex = info.indev->ifindex;
+ for (i = 0; i < info.num_encaps; i++) {
+ route->tuple[!dir].in.encap[i].id = info.encap[i].id;
+ route->tuple[!dir].in.encap[i].proto = info.encap[i].proto;
+ }
+ route->tuple[!dir].in.num_encaps = info.num_encaps;
+ route->tuple[!dir].in.ingress_vlans = info.ingress_vlans;
+
+ if (info.xmit_type == FLOW_OFFLOAD_XMIT_DIRECT) {
+ memcpy(route->tuple[dir].out.h_source, info.h_source, ETH_ALEN);
+ memcpy(route->tuple[dir].out.h_dest, info.h_dest, ETH_ALEN);
+ route->tuple[dir].out.ifindex = info.outdev->ifindex;
+ route->tuple[dir].out.hw_ifindex = info.hw_outdev->ifindex;
+ route->tuple[dir].xmit_type = info.xmit_type;
+ }
+}
+
+int nft_flow_route(const struct nft_pktinfo *pkt, const struct nf_conn *ct,
+ struct nf_flow_route *route, enum ip_conntrack_dir dir,
+ struct nft_flowtable *ft)
+{
+ struct dst_entry *this_dst = skb_dst(pkt->skb);
+ struct dst_entry *other_dst = NULL;
+ struct flowi fl;
+
+ memset(&fl, 0, sizeof(fl));
+ switch (nft_pf(pkt)) {
+ case NFPROTO_IPV4:
+ fl.u.ip4.daddr = ct->tuplehash[dir].tuple.src.u3.ip;
+ fl.u.ip4.saddr = ct->tuplehash[!dir].tuple.src.u3.ip;
+ fl.u.ip4.flowi4_oif = nft_in(pkt)->ifindex;
+ fl.u.ip4.flowi4_iif = this_dst->dev->ifindex;
+ fl.u.ip4.flowi4_dscp = ip4h_dscp(ip_hdr(pkt->skb));
+ fl.u.ip4.flowi4_mark = pkt->skb->mark;
+ fl.u.ip4.flowi4_flags = FLOWI_FLAG_ANYSRC;
+ break;
+ case NFPROTO_IPV6:
+ fl.u.ip6.daddr = ct->tuplehash[dir].tuple.src.u3.in6;
+ fl.u.ip6.saddr = ct->tuplehash[!dir].tuple.src.u3.in6;
+ fl.u.ip6.flowi6_oif = nft_in(pkt)->ifindex;
+ fl.u.ip6.flowi6_iif = this_dst->dev->ifindex;
+ fl.u.ip6.flowlabel = ip6_flowinfo(ipv6_hdr(pkt->skb));
+ fl.u.ip6.flowi6_mark = pkt->skb->mark;
+ fl.u.ip6.flowi6_flags = FLOWI_FLAG_ANYSRC;
+ break;
+ }
+
+ if (!dst_hold_safe(this_dst))
+ return -ENOENT;
+
+ nf_route(nft_net(pkt), &other_dst, &fl, false, nft_pf(pkt));
+ if (!other_dst) {
+ dst_release(this_dst);
+ return -ENOENT;
+ }
+
+ nft_default_forward_path(route, this_dst, dir);
+ nft_default_forward_path(route, other_dst, !dir);
+
+ if (route->tuple[dir].xmit_type == FLOW_OFFLOAD_XMIT_NEIGH &&
+ route->tuple[!dir].xmit_type == FLOW_OFFLOAD_XMIT_NEIGH) {
+ nft_dev_forward_path(route, ct, dir, ft);
+ nft_dev_forward_path(route, ct, !dir, ft);
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(nft_flow_route);
struct nft_flowtable *flowtable;
};
-static enum flow_offload_xmit_type nft_xmit_type(struct dst_entry *dst)
-{
- if (dst_xfrm(dst))
- return FLOW_OFFLOAD_XMIT_XFRM;
-
- return FLOW_OFFLOAD_XMIT_NEIGH;
-}
-
-static void nft_default_forward_path(struct nf_flow_route *route,
- struct dst_entry *dst_cache,
- enum ip_conntrack_dir dir)
-{
- route->tuple[!dir].in.ifindex = dst_cache->dev->ifindex;
- route->tuple[dir].dst = dst_cache;
- route->tuple[dir].xmit_type = nft_xmit_type(dst_cache);
-}
-
-static bool nft_is_valid_ether_device(const struct net_device *dev)
-{
- if (!dev || (dev->flags & IFF_LOOPBACK) || dev->type != ARPHRD_ETHER ||
- dev->addr_len != ETH_ALEN || !is_valid_ether_addr(dev->dev_addr))
- return false;
-
- return true;
-}
-
-static int nft_dev_fill_forward_path(const struct nf_flow_route *route,
- const struct dst_entry *dst_cache,
- const struct nf_conn *ct,
- enum ip_conntrack_dir dir, u8 *ha,
- struct net_device_path_stack *stack)
-{
- const void *daddr = &ct->tuplehash[!dir].tuple.src.u3;
- struct net_device *dev = dst_cache->dev;
- struct neighbour *n;
- u8 nud_state;
-
- if (!nft_is_valid_ether_device(dev))
- goto out;
-
- n = dst_neigh_lookup(dst_cache, daddr);
- if (!n)
- return -1;
-
- read_lock_bh(&n->lock);
- nud_state = n->nud_state;
- ether_addr_copy(ha, n->ha);
- read_unlock_bh(&n->lock);
- neigh_release(n);
-
- if (!(nud_state & NUD_VALID))
- return -1;
-
-out:
- return dev_fill_forward_path(dev, ha, stack);
-}
-
-struct nft_forward_info {
- const struct net_device *indev;
- const struct net_device *outdev;
- const struct net_device *hw_outdev;
- struct id {
- __u16 id;
- __be16 proto;
- } encap[NF_FLOW_TABLE_ENCAP_MAX];
- u8 num_encaps;
- u8 ingress_vlans;
- u8 h_source[ETH_ALEN];
- u8 h_dest[ETH_ALEN];
- enum flow_offload_xmit_type xmit_type;
-};
-
-static void nft_dev_path_info(const struct net_device_path_stack *stack,
- struct nft_forward_info *info,
- unsigned char *ha, struct nf_flowtable *flowtable)
-{
- const struct net_device_path *path;
- int i;
-
- memcpy(info->h_dest, ha, ETH_ALEN);
-
- for (i = 0; i < stack->num_paths; i++) {
- path = &stack->path[i];
- switch (path->type) {
- case DEV_PATH_ETHERNET:
- case DEV_PATH_DSA:
- case DEV_PATH_VLAN:
- case DEV_PATH_PPPOE:
- info->indev = path->dev;
- if (is_zero_ether_addr(info->h_source))
- memcpy(info->h_source, path->dev->dev_addr, ETH_ALEN);
-
- if (path->type == DEV_PATH_ETHERNET)
- break;
- if (path->type == DEV_PATH_DSA) {
- i = stack->num_paths;
- break;
- }
-
- /* DEV_PATH_VLAN and DEV_PATH_PPPOE */
- if (info->num_encaps >= NF_FLOW_TABLE_ENCAP_MAX) {
- info->indev = NULL;
- break;
- }
- if (!info->outdev)
- info->outdev = path->dev;
- 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;
- case DEV_PATH_BRIDGE:
- if (is_zero_ether_addr(info->h_source))
- memcpy(info->h_source, path->dev->dev_addr, ETH_ALEN);
-
- switch (path->bridge.vlan_mode) {
- case DEV_PATH_BR_VLAN_UNTAG_HW:
- info->ingress_vlans |= BIT(info->num_encaps - 1);
- break;
- case DEV_PATH_BR_VLAN_TAG:
- if (info->num_encaps >= NF_FLOW_TABLE_ENCAP_MAX) {
- info->indev = NULL;
- break;
- }
- info->encap[info->num_encaps].id = path->bridge.vlan_id;
- info->encap[info->num_encaps].proto = path->bridge.vlan_proto;
- info->num_encaps++;
- break;
- case DEV_PATH_BR_VLAN_UNTAG:
- if (WARN_ON_ONCE(info->num_encaps-- == 0)) {
- info->indev = NULL;
- break;
- }
- break;
- case DEV_PATH_BR_VLAN_KEEP:
- break;
- }
- info->xmit_type = FLOW_OFFLOAD_XMIT_DIRECT;
- break;
- default:
- info->indev = NULL;
- break;
- }
- }
- if (!info->outdev)
- info->outdev = info->indev;
-
- info->hw_outdev = info->indev;
-
- if (nf_flowtable_hw_offload(flowtable) &&
- nft_is_valid_ether_device(info->indev))
- info->xmit_type = FLOW_OFFLOAD_XMIT_DIRECT;
-}
-
-static bool nft_flowtable_find_dev(const struct net_device *dev,
- struct nft_flowtable *ft)
-{
- struct nft_hook *hook;
- bool found = false;
-
- list_for_each_entry_rcu(hook, &ft->hook_list, list) {
- if (!nft_hook_find_ops_rcu(hook, dev))
- continue;
-
- found = true;
- break;
- }
-
- return found;
-}
-
-static void nft_dev_forward_path(struct nf_flow_route *route,
- const struct nf_conn *ct,
- enum ip_conntrack_dir dir,
- struct nft_flowtable *ft)
-{
- const struct dst_entry *dst = route->tuple[dir].dst;
- struct net_device_path_stack stack;
- struct nft_forward_info info = {};
- unsigned char ha[ETH_ALEN];
- int i;
-
- if (nft_dev_fill_forward_path(route, dst, ct, dir, ha, &stack) >= 0)
- nft_dev_path_info(&stack, &info, ha, &ft->data);
-
- if (!info.indev || !nft_flowtable_find_dev(info.indev, ft))
- return;
-
- route->tuple[!dir].in.ifindex = info.indev->ifindex;
- for (i = 0; i < info.num_encaps; i++) {
- route->tuple[!dir].in.encap[i].id = info.encap[i].id;
- route->tuple[!dir].in.encap[i].proto = info.encap[i].proto;
- }
- route->tuple[!dir].in.num_encaps = info.num_encaps;
- route->tuple[!dir].in.ingress_vlans = info.ingress_vlans;
-
- if (info.xmit_type == FLOW_OFFLOAD_XMIT_DIRECT) {
- memcpy(route->tuple[dir].out.h_source, info.h_source, ETH_ALEN);
- memcpy(route->tuple[dir].out.h_dest, info.h_dest, ETH_ALEN);
- route->tuple[dir].out.ifindex = info.outdev->ifindex;
- route->tuple[dir].out.hw_ifindex = info.hw_outdev->ifindex;
- route->tuple[dir].xmit_type = info.xmit_type;
- }
-}
-
-static int nft_flow_route(const struct nft_pktinfo *pkt,
- const struct nf_conn *ct,
- struct nf_flow_route *route,
- enum ip_conntrack_dir dir,
- struct nft_flowtable *ft)
-{
- struct dst_entry *this_dst = skb_dst(pkt->skb);
- struct dst_entry *other_dst = NULL;
- struct flowi fl;
-
- memset(&fl, 0, sizeof(fl));
- switch (nft_pf(pkt)) {
- case NFPROTO_IPV4:
- fl.u.ip4.daddr = ct->tuplehash[dir].tuple.src.u3.ip;
- fl.u.ip4.saddr = ct->tuplehash[!dir].tuple.src.u3.ip;
- fl.u.ip4.flowi4_oif = nft_in(pkt)->ifindex;
- fl.u.ip4.flowi4_iif = this_dst->dev->ifindex;
- fl.u.ip4.flowi4_dscp = ip4h_dscp(ip_hdr(pkt->skb));
- fl.u.ip4.flowi4_mark = pkt->skb->mark;
- fl.u.ip4.flowi4_flags = FLOWI_FLAG_ANYSRC;
- break;
- case NFPROTO_IPV6:
- fl.u.ip6.daddr = ct->tuplehash[dir].tuple.src.u3.in6;
- fl.u.ip6.saddr = ct->tuplehash[!dir].tuple.src.u3.in6;
- fl.u.ip6.flowi6_oif = nft_in(pkt)->ifindex;
- fl.u.ip6.flowi6_iif = this_dst->dev->ifindex;
- fl.u.ip6.flowlabel = ip6_flowinfo(ipv6_hdr(pkt->skb));
- fl.u.ip6.flowi6_mark = pkt->skb->mark;
- fl.u.ip6.flowi6_flags = FLOWI_FLAG_ANYSRC;
- break;
- }
-
- if (!dst_hold_safe(this_dst))
- return -ENOENT;
-
- nf_route(nft_net(pkt), &other_dst, &fl, false, nft_pf(pkt));
- if (!other_dst) {
- dst_release(this_dst);
- return -ENOENT;
- }
-
- nft_default_forward_path(route, this_dst, dir);
- nft_default_forward_path(route, other_dst, !dir);
-
- if (route->tuple[dir].xmit_type == FLOW_OFFLOAD_XMIT_NEIGH &&
- route->tuple[!dir].xmit_type == FLOW_OFFLOAD_XMIT_NEIGH) {
- nft_dev_forward_path(route, ct, dir, ft);
- nft_dev_forward_path(route, ct, !dir, ft);
- }
-
- return 0;
-}
-
static bool nft_flow_offload_skip(struct sk_buff *skb, int family)
{
if (skb_sec_path(skb))
gentwo / linux / .git / commitdiff