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Date: Mon, 5 Sep 2022 21:33:58 +0200
From: Toke Høiland-Jørgensen <toke@...hat.com>
To: Alexei Starovoitov <ast@...nel.org>,
Daniel Borkmann <daniel@...earbox.net>,
Andrii Nakryiko <andrii@...nel.org>,
Martin KaFai Lau <martin.lau@...ux.dev>,
Song Liu <song@...nel.org>, Yonghong Song <yhs@...com>,
John Fastabend <john.fastabend@...il.com>,
KP Singh <kpsingh@...nel.org>,
Stanislav Fomichev <sdf@...gle.com>,
Hao Luo <haoluo@...gle.com>, Jiri Olsa <jolsa@...nel.org>,
"David S. Miller" <davem@...emloft.net>,
Jakub Kicinski <kuba@...nel.org>,
Jesper Dangaard Brouer <hawk@...nel.org>,
Björn Töpel <bjorn@...nel.org>,
Magnus Karlsson <magnus.karlsson@...el.com>,
Maciej Fijalkowski <maciej.fijalkowski@...el.com>,
Jonathan Lemon <jonathan.lemon@...il.com>
Cc: Toke Høiland-Jørgensen <toke@...hat.com>,
Eric Dumazet <edumazet@...gle.com>,
Paolo Abeni <pabeni@...hat.com>, bpf@...r.kernel.org,
netdev@...r.kernel.org
Subject: [PATCH bpf-next v2 2/3] bpf: Expand map key argument of bpf_redirect_map to u64
For queueing packets in XDP we want to add a new redirect map type with
support for 64-bit indexes. To prepare fore this, expand the width of the
'key' argument to the bpf_redirect_map() helper. Since BPF registers are
always 64-bit, this should be safe to do after the fact.
Reviewed-by: Stanislav Fomichev <sdf@...gle.com>
Signed-off-by: Toke Høiland-Jørgensen <toke@...hat.com>
---
include/linux/bpf.h | 2 +-
include/linux/filter.h | 12 ++++++------
include/uapi/linux/bpf.h | 2 +-
kernel/bpf/cpumap.c | 4 ++--
kernel/bpf/devmap.c | 4 ++--
kernel/bpf/verifier.c | 2 +-
net/core/filter.c | 4 ++--
net/xdp/xskmap.c | 4 ++--
8 files changed, 17 insertions(+), 17 deletions(-)
diff --git a/include/linux/bpf.h b/include/linux/bpf.h
index 9c1674973e03..222cba23e6d9 100644
--- a/include/linux/bpf.h
+++ b/include/linux/bpf.h
@@ -134,7 +134,7 @@ struct bpf_map_ops {
struct bpf_local_storage __rcu ** (*map_owner_storage_ptr)(void *owner);
/* Misc helpers.*/
- int (*map_redirect)(struct bpf_map *map, u32 ifindex, u64 flags);
+ int (*map_redirect)(struct bpf_map *map, u64 key, u64 flags);
/* map_meta_equal must be implemented for maps that can be
* used as an inner map. It is a runtime check to ensure
diff --git a/include/linux/filter.h b/include/linux/filter.h
index 527ae1d64e27..eff295509f03 100644
--- a/include/linux/filter.h
+++ b/include/linux/filter.h
@@ -637,13 +637,13 @@ struct bpf_nh_params {
};
struct bpf_redirect_info {
- u32 flags;
- u32 tgt_index;
+ u64 tgt_index;
void *tgt_value;
struct bpf_map *map;
+ u32 flags;
+ u32 kern_flags;
u32 map_id;
enum bpf_map_type map_type;
- u32 kern_flags;
struct bpf_nh_params nh;
};
@@ -1493,7 +1493,7 @@ static inline bool bpf_sk_lookup_run_v6(struct net *net, int protocol,
}
#endif /* IS_ENABLED(CONFIG_IPV6) */
-static __always_inline int __bpf_xdp_redirect_map(struct bpf_map *map, u32 ifindex,
+static __always_inline int __bpf_xdp_redirect_map(struct bpf_map *map, u64 index,
u64 flags, const u64 flag_mask,
void *lookup_elem(struct bpf_map *map, u32 key))
{
@@ -1504,7 +1504,7 @@ static __always_inline int __bpf_xdp_redirect_map(struct bpf_map *map, u32 ifind
if (unlikely(flags & ~(action_mask | flag_mask)))
return XDP_ABORTED;
- ri->tgt_value = lookup_elem(map, ifindex);
+ ri->tgt_value = lookup_elem(map, index);
if (unlikely(!ri->tgt_value) && !(flags & BPF_F_BROADCAST)) {
/* If the lookup fails we want to clear out the state in the
* redirect_info struct completely, so that if an eBPF program
@@ -1516,7 +1516,7 @@ static __always_inline int __bpf_xdp_redirect_map(struct bpf_map *map, u32 ifind
return flags & action_mask;
}
- ri->tgt_index = ifindex;
+ ri->tgt_index = index;
ri->map_id = map->id;
ri->map_type = map->map_type;
diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h
index 837c0f9b7fdd..c6d37ac2b87c 100644
--- a/include/uapi/linux/bpf.h
+++ b/include/uapi/linux/bpf.h
@@ -2629,7 +2629,7 @@ union bpf_attr {
* Return
* 0 on success, or a negative error in case of failure.
*
- * long bpf_redirect_map(struct bpf_map *map, u32 key, u64 flags)
+ * long bpf_redirect_map(struct bpf_map *map, u64 key, u64 flags)
* Description
* Redirect the packet to the endpoint referenced by *map* at
* index *key*. Depending on its type, this *map* can contain
diff --git a/kernel/bpf/cpumap.c b/kernel/bpf/cpumap.c
index b5ba34ddd4b6..39ed08a2bb52 100644
--- a/kernel/bpf/cpumap.c
+++ b/kernel/bpf/cpumap.c
@@ -668,9 +668,9 @@ static int cpu_map_get_next_key(struct bpf_map *map, void *key, void *next_key)
return 0;
}
-static int cpu_map_redirect(struct bpf_map *map, u32 ifindex, u64 flags)
+static int cpu_map_redirect(struct bpf_map *map, u64 index, u64 flags)
{
- return __bpf_xdp_redirect_map(map, ifindex, flags, 0,
+ return __bpf_xdp_redirect_map(map, index, flags, 0,
__cpu_map_lookup_elem);
}
diff --git a/kernel/bpf/devmap.c b/kernel/bpf/devmap.c
index f9a87dcc5535..d01e4c55b376 100644
--- a/kernel/bpf/devmap.c
+++ b/kernel/bpf/devmap.c
@@ -992,14 +992,14 @@ static int dev_map_hash_update_elem(struct bpf_map *map, void *key, void *value,
map, key, value, map_flags);
}
-static int dev_map_redirect(struct bpf_map *map, u32 ifindex, u64 flags)
+static int dev_map_redirect(struct bpf_map *map, u64 ifindex, u64 flags)
{
return __bpf_xdp_redirect_map(map, ifindex, flags,
BPF_F_BROADCAST | BPF_F_EXCLUDE_INGRESS,
__dev_map_lookup_elem);
}
-static int dev_hash_map_redirect(struct bpf_map *map, u32 ifindex, u64 flags)
+static int dev_hash_map_redirect(struct bpf_map *map, u64 ifindex, u64 flags)
{
return __bpf_xdp_redirect_map(map, ifindex, flags,
BPF_F_BROADCAST | BPF_F_EXCLUDE_INGRESS,
diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c
index 068b20ed34d2..844a44694b6f 100644
--- a/kernel/bpf/verifier.c
+++ b/kernel/bpf/verifier.c
@@ -14169,7 +14169,7 @@ static int do_misc_fixups(struct bpf_verifier_env *env)
BUILD_BUG_ON(!__same_type(ops->map_peek_elem,
(int (*)(struct bpf_map *map, void *value))NULL));
BUILD_BUG_ON(!__same_type(ops->map_redirect,
- (int (*)(struct bpf_map *map, u32 ifindex, u64 flags))NULL));
+ (int (*)(struct bpf_map *map, u64 index, u64 flags))NULL));
BUILD_BUG_ON(!__same_type(ops->map_for_each_callback,
(int (*)(struct bpf_map *map,
bpf_callback_t callback_fn,
diff --git a/net/core/filter.c b/net/core/filter.c
index ee768bb5b5ab..285eaee2b373 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -4408,10 +4408,10 @@ static const struct bpf_func_proto bpf_xdp_redirect_proto = {
.arg2_type = ARG_ANYTHING,
};
-BPF_CALL_3(bpf_xdp_redirect_map, struct bpf_map *, map, u32, ifindex,
+BPF_CALL_3(bpf_xdp_redirect_map, struct bpf_map *, map, u64, key,
u64, flags)
{
- return map->ops->map_redirect(map, ifindex, flags);
+ return map->ops->map_redirect(map, key, flags);
}
static const struct bpf_func_proto bpf_xdp_redirect_map_proto = {
diff --git a/net/xdp/xskmap.c b/net/xdp/xskmap.c
index acc8e52a4f5f..771d0fa90ef5 100644
--- a/net/xdp/xskmap.c
+++ b/net/xdp/xskmap.c
@@ -231,9 +231,9 @@ static int xsk_map_delete_elem(struct bpf_map *map, void *key)
return 0;
}
-static int xsk_map_redirect(struct bpf_map *map, u32 ifindex, u64 flags)
+static int xsk_map_redirect(struct bpf_map *map, u64 index, u64 flags)
{
- return __bpf_xdp_redirect_map(map, ifindex, flags, 0,
+ return __bpf_xdp_redirect_map(map, index, flags, 0,
__xsk_map_lookup_elem);
}
--
2.37.2
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