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Message-Id: <20201015011630.2399-6-pablo@netfilter.org>
Date: Thu, 15 Oct 2020 03:16:26 +0200
From: Pablo Neira Ayuso <pablo@...filter.org>
To: netfilter-devel@...r.kernel.org
Cc: davem@...emloft.net, netdev@...r.kernel.org, kuba@...nel.org
Subject: [PATCH net-next 5/9] netfilter: flowtable: use dev_fill_forward_path() to obtain ingress device
The ingress device in the tuple is obtained from route in the reply
direction. Use dev_fill_forward_path() instead to provide the real
ingress device for this flow.
Signed-off-by: Pablo Neira Ayuso <pablo@...filter.org>
---
include/net/netfilter/nf_flow_table.h | 6 ++-
net/netfilter/nf_flow_table_core.c | 3 +-
net/netfilter/nft_flow_offload.c | 75 ++++++++++++++++++++++++++-
3 files changed, 80 insertions(+), 4 deletions(-)
diff --git a/include/net/netfilter/nf_flow_table.h b/include/net/netfilter/nf_flow_table.h
index 08e779f149ee..ecb84d4358cc 100644
--- a/include/net/netfilter/nf_flow_table.h
+++ b/include/net/netfilter/nf_flow_table.h
@@ -112,9 +112,10 @@ struct flow_offload_tuple {
u8 l3proto;
u8 l4proto;
+
+ /* All members above are keys for lookups, see flow_offload_hash(). */
u8 dir;
enum flow_offload_xmit_type xmit_type:8;
-
u16 mtu;
struct dst_entry *dst_cache;
@@ -160,6 +161,9 @@ static inline __s32 nf_flow_timeout_delta(unsigned int timeout)
struct nf_flow_route {
struct {
+ struct {
+ u32 ifindex;
+ } in;
struct dst_entry *dst;
} tuple[FLOW_OFFLOAD_DIR_MAX];
};
diff --git a/net/netfilter/nf_flow_table_core.c b/net/netfilter/nf_flow_table_core.c
index 97f04f244961..66abc7f287a3 100644
--- a/net/netfilter/nf_flow_table_core.c
+++ b/net/netfilter/nf_flow_table_core.c
@@ -79,7 +79,6 @@ static int flow_offload_fill_route(struct flow_offload *flow,
enum flow_offload_tuple_dir dir)
{
struct flow_offload_tuple *flow_tuple = &flow->tuplehash[dir].tuple;
- struct dst_entry *other_dst = route->tuple[!dir].dst;
struct dst_entry *dst = route->tuple[dir].dst;
if (!dst_hold_safe(route->tuple[dir].dst))
@@ -94,7 +93,7 @@ static int flow_offload_fill_route(struct flow_offload *flow,
break;
}
- flow_tuple->iifidx = other_dst->dev->ifindex;
+ flow_tuple->iifidx = route->tuple[dir].in.ifindex;
if (dst_xfrm(dst))
flow_tuple->xmit_type = FLOW_OFFLOAD_XMIT_XFRM;
diff --git a/net/netfilter/nft_flow_offload.c b/net/netfilter/nft_flow_offload.c
index 3a6c84fb2c90..4b476b0a3c88 100644
--- a/net/netfilter/nft_flow_offload.c
+++ b/net/netfilter/nft_flow_offload.c
@@ -19,6 +19,75 @@ struct nft_flow_offload {
struct nft_flowtable *flowtable;
};
+static int nft_dev_fill_forward_path(const struct nf_flow_route *route,
+ const struct nf_conn *ct,
+ enum ip_conntrack_dir dir,
+ struct net_device_path_stack *stack)
+{
+ const struct dst_entry *dst_cache = route->tuple[dir].dst;
+ const void *daddr = &ct->tuplehash[!dir].tuple.src.u3;
+ unsigned char ha[ETH_ALEN];
+ struct net_device *dev;
+ struct neighbour *n;
+ struct rtable *rt;
+ u8 nud_state;
+
+ rt = (struct rtable *)dst_cache;
+ dev = rt->dst.dev;
+
+ 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;
+
+ return dev_fill_forward_path(dev, ha, stack);
+}
+
+struct nft_forward_info {
+ u32 iifindex;
+};
+
+static int nft_dev_forward_path(struct nf_flow_route *route,
+ const struct nf_conn *ct,
+ enum ip_conntrack_dir dir)
+{
+ struct net_device_path_stack stack = {};
+ struct nft_forward_info info = {};
+ struct net_device_path *path;
+ int i, ret;
+
+ memset(&stack, 0, sizeof(stack));
+
+ ret = nft_dev_fill_forward_path(route, ct, dir, &stack);
+ if (ret < 0)
+ return -1;
+
+ for (i = stack.num_paths - 1; i >= 0; i--) {
+ path = &stack.path[i];
+ switch (path->type) {
+ case DEV_PATH_ETHERNET:
+ info.iifindex = path->dev->ifindex;
+ break;
+ case DEV_PATH_VLAN:
+ return -1;
+ case DEV_PATH_BRIDGE:
+ return -1;
+ }
+ }
+
+ route->tuple[!dir].in.ifindex = info.iifindex;
+
+ return 0;
+}
+
static int nft_flow_route(const struct nft_pktinfo *pkt,
const struct nf_conn *ct,
struct nf_flow_route *route,
@@ -47,6 +116,10 @@ static int nft_flow_route(const struct nft_pktinfo *pkt,
route->tuple[dir].dst = this_dst;
route->tuple[!dir].dst = other_dst;
+ if (nft_dev_forward_path(route, ct, IP_CT_DIR_ORIGINAL) < 0 ||
+ nft_dev_forward_path(route, ct, IP_CT_DIR_REPLY) < 0)
+ return -ENOENT;
+
return 0;
}
@@ -74,8 +147,8 @@ 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;
struct tcphdr _tcph, *tcph = NULL;
+ struct nf_flow_route route = {};
enum ip_conntrack_info ctinfo;
- struct nf_flow_route route;
struct flow_offload *flow;
enum ip_conntrack_dir dir;
struct nf_conn *ct;
--
2.20.1
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