From: David Ahern <dsahern@kernel.org>
To: netdev@vger.kernel.org
Cc: bpf@vger.kernel.org, davem@davemloft.net, kuba@kernel.org,
brouer@redhat.com, toke@redhat.com, lorenzo@kernel.org,
daniel@iogearbox.net, john.fastabend@gmail.com, ast@kernel.org,
kafai@fb.com, songliubraving@fb.com, yhs@fb.com, andriin@fb.com,
dsahern@gmail.com, David Ahern <dsahern@kernel.org>
Subject: [PATCH v4 bpf-next 1/5] devmap: Formalize map value as a named struct
Date: Fri, 29 May 2020 16:07:12 -0600 [thread overview]
Message-ID: <20200529220716.75383-2-dsahern@kernel.org> (raw)
In-Reply-To: <20200529220716.75383-1-dsahern@kernel.org>
Add 'struct bpf_devmap_val' to formalize the expected values that can
be passed in for a DEVMAP. Update devmap code to use the struct.
Signed-off-by: David Ahern <dsahern@kernel.org>
Acked-by: Toke Høiland-Jørgensen <toke@redhat.com>
---
kernel/bpf/devmap.c | 45 ++++++++++++++++++++++++++++-----------------
1 file changed, 28 insertions(+), 17 deletions(-)
diff --git a/kernel/bpf/devmap.c b/kernel/bpf/devmap.c
index a51d9fb7a359..a1459de0914e 100644
--- a/kernel/bpf/devmap.c
+++ b/kernel/bpf/devmap.c
@@ -60,12 +60,18 @@ struct xdp_dev_bulk_queue {
unsigned int count;
};
+/* DEVMAP values */
+struct bpf_devmap_val {
+ u32 ifindex; /* device index */
+};
+
struct bpf_dtab_netdev {
struct net_device *dev; /* must be first member, due to tracepoint */
struct hlist_node index_hlist;
struct bpf_dtab *dtab;
struct rcu_head rcu;
unsigned int idx;
+ struct bpf_devmap_val val;
};
struct bpf_dtab {
@@ -472,18 +478,15 @@ int dev_map_generic_redirect(struct bpf_dtab_netdev *dst, struct sk_buff *skb,
static void *dev_map_lookup_elem(struct bpf_map *map, void *key)
{
struct bpf_dtab_netdev *obj = __dev_map_lookup_elem(map, *(u32 *)key);
- struct net_device *dev = obj ? obj->dev : NULL;
- return dev ? &dev->ifindex : NULL;
+ return obj ? &obj->val : NULL;
}
static void *dev_map_hash_lookup_elem(struct bpf_map *map, void *key)
{
struct bpf_dtab_netdev *obj = __dev_map_hash_lookup_elem(map,
*(u32 *)key);
- struct net_device *dev = obj ? obj->dev : NULL;
-
- return dev ? &dev->ifindex : NULL;
+ return obj ? &obj->val : NULL;
}
static void __dev_map_entry_free(struct rcu_head *rcu)
@@ -541,7 +544,7 @@ static int dev_map_hash_delete_elem(struct bpf_map *map, void *key)
static struct bpf_dtab_netdev *__dev_map_alloc_node(struct net *net,
struct bpf_dtab *dtab,
- u32 ifindex,
+ struct bpf_devmap_val *val,
unsigned int idx)
{
struct bpf_dtab_netdev *dev;
@@ -551,16 +554,18 @@ static struct bpf_dtab_netdev *__dev_map_alloc_node(struct net *net,
if (!dev)
return ERR_PTR(-ENOMEM);
- dev->dev = dev_get_by_index(net, ifindex);
- if (!dev->dev) {
- kfree(dev);
- return ERR_PTR(-EINVAL);
- }
+ dev->dev = dev_get_by_index(net, val->ifindex);
+ if (!dev->dev)
+ goto err_out;
dev->idx = idx;
dev->dtab = dtab;
+ dev->val.ifindex = val->ifindex;
return dev;
+err_out:
+ kfree(dev);
+ return ERR_PTR(-EINVAL);
}
static int __dev_map_update_elem(struct net *net, struct bpf_map *map,
@@ -568,7 +573,7 @@ static int __dev_map_update_elem(struct net *net, struct bpf_map *map,
{
struct bpf_dtab *dtab = container_of(map, struct bpf_dtab, map);
struct bpf_dtab_netdev *dev, *old_dev;
- u32 ifindex = *(u32 *)value;
+ struct bpf_devmap_val val = { };
u32 i = *(u32 *)key;
if (unlikely(map_flags > BPF_EXIST))
@@ -578,10 +583,13 @@ static int __dev_map_update_elem(struct net *net, struct bpf_map *map,
if (unlikely(map_flags == BPF_NOEXIST))
return -EEXIST;
- if (!ifindex) {
+ /* already verified value_size <= sizeof val */
+ memcpy(&val, value, map->value_size);
+
+ if (!val.ifindex) {
dev = NULL;
} else {
- dev = __dev_map_alloc_node(net, dtab, ifindex, i);
+ dev = __dev_map_alloc_node(net, dtab, &val, i);
if (IS_ERR(dev))
return PTR_ERR(dev);
}
@@ -609,12 +617,15 @@ static int __dev_map_hash_update_elem(struct net *net, struct bpf_map *map,
{
struct bpf_dtab *dtab = container_of(map, struct bpf_dtab, map);
struct bpf_dtab_netdev *dev, *old_dev;
- u32 ifindex = *(u32 *)value;
+ struct bpf_devmap_val val = { };
u32 idx = *(u32 *)key;
unsigned long flags;
int err = -EEXIST;
- if (unlikely(map_flags > BPF_EXIST || !ifindex))
+ /* already verified value_size <= sizeof val */
+ memcpy(&val, value, map->value_size);
+
+ if (unlikely(map_flags > BPF_EXIST || !val.ifindex))
return -EINVAL;
spin_lock_irqsave(&dtab->index_lock, flags);
@@ -623,7 +634,7 @@ static int __dev_map_hash_update_elem(struct net *net, struct bpf_map *map,
if (old_dev && (map_flags & BPF_NOEXIST))
goto out_err;
- dev = __dev_map_alloc_node(net, dtab, ifindex, idx);
+ dev = __dev_map_alloc_node(net, dtab, &val, idx);
if (IS_ERR(dev)) {
err = PTR_ERR(dev);
goto out_err;
--
2.21.1 (Apple Git-122.3)
next prev parent reply other threads:[~2020-05-29 22:07 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-29 22:07 [PATCH v4 bpf-next 0/5] bpf: Add support for XDP programs in DEVMAP entries David Ahern
2020-05-29 22:07 ` David Ahern [this message]
2020-05-29 22:07 ` [PATCH v4 bpf-next 2/5] bpf: Add support to attach bpf program to a devmap entry David Ahern
2020-05-29 22:07 ` [PATCH v4 bpf-next 3/5] xdp: Add xdp_txq_info to xdp_buff David Ahern
2020-05-29 22:07 ` [PATCH v4 bpf-next 4/5] libbpf: Add SEC name for xdp programs attached to device map David Ahern
2020-05-29 22:07 ` [PATCH v4 bpf-next 5/5] selftest: Add tests for XDP programs in devmap entries David Ahern
2020-06-01 21:12 ` [PATCH v4 bpf-next 0/5] bpf: Add support for XDP programs in DEVMAP entries Alexei Starovoitov
2020-06-01 22:28 ` David Ahern
2020-06-01 22:31 ` Alexei Starovoitov
2020-06-01 22:52 ` Andrii Nakryiko
2020-06-02 3:00 ` David Ahern
2020-06-05 23:45 ` David Ahern
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