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Message-Id: <20240522050712.732558-1-brad@faucet.nz>
Date: Wed, 22 May 2024 17:07:11 +1200
From: Brad Cowie <brad@...cet.nz>
To: bpf@...r.kernel.org, martin.lau@...ux.dev
Cc: lorenzo@...nel.org, memxor@...il.com, pablo@...filter.org,
davem@...emloft.net, kuba@...nel.org, pabeni@...hat.com, ast@...nel.org,
daniel@...earbox.net, andrii@...nel.org, song@...nel.org,
john.fastabend@...il.com, sdf@...gle.com, jolsa@...nel.org,
netfilter-devel@...r.kernel.org, coreteam@...filter.org,
netdev@...r.kernel.org, Brad Cowie <brad@...cet.nz>
Subject: [PATCH bpf-next v4 1/2] net: netfilter: Make ct zone opts configurable for bpf ct helpers
Add ct zone id and direction to bpf_ct_opts so that arbitrary ct zones
can be used for xdp/tc bpf ct helper functions bpf_{xdp,skb}_ct_alloc
and bpf_{xdp,skb}_ct_lookup.
Signed-off-by: Brad Cowie <brad@...cet.nz>
---
v2 -> v3:
- Remove whitespace changes
- Add reserved padding options
- If ct_zone_id is set when opts size isn't 16, return -EINVAL
- Remove ct_zone_flags
(not used by nf_conntrack_alloc or nf_conntrack_find_get)
v1 -> v2:
- Make ct zone flags/dir configurable
---
net/netfilter/nf_conntrack_bpf.c | 68 ++++++++++++++++++++++++++------
1 file changed, 55 insertions(+), 13 deletions(-)
diff --git a/net/netfilter/nf_conntrack_bpf.c b/net/netfilter/nf_conntrack_bpf.c
index d2492d050fe6..4a136fc3a9c0 100644
--- a/net/netfilter/nf_conntrack_bpf.c
+++ b/net/netfilter/nf_conntrack_bpf.c
@@ -32,7 +32,9 @@
* -EINVAL - Passed NULL for bpf_tuple pointer
* -EINVAL - opts->reserved is not 0
* -EINVAL - netns_id is less than -1
- * -EINVAL - opts__sz isn't NF_BPF_CT_OPTS_SZ (12)
+ * -EINVAL - opts__sz isn't NF_BPF_CT_OPTS_SZ (16) or 12
+ * -EINVAL - opts->ct_zone_id set when
+ opts__sz isn't NF_BPF_CT_OPTS_SZ (16)
* -EPROTO - l4proto isn't one of IPPROTO_TCP or IPPROTO_UDP
* -ENONET - No network namespace found for netns_id
* -ENOENT - Conntrack lookup could not find entry for tuple
@@ -42,6 +44,8 @@
* Values:
* IPPROTO_TCP, IPPROTO_UDP
* @dir: - connection tracking tuple direction.
+ * @ct_zone_id - connection tracking zone id.
+ * @ct_zone_dir - connection tracking zone direction.
* @reserved - Reserved member, will be reused for more options in future
* Values:
* 0
@@ -51,11 +55,13 @@ struct bpf_ct_opts {
s32 error;
u8 l4proto;
u8 dir;
- u8 reserved[2];
+ u16 ct_zone_id;
+ u8 ct_zone_dir;
+ u8 reserved[3];
};
enum {
- NF_BPF_CT_OPTS_SZ = 12,
+ NF_BPF_CT_OPTS_SZ = 16,
};
static int bpf_nf_ct_tuple_parse(struct bpf_sock_tuple *bpf_tuple,
@@ -104,12 +110,21 @@ __bpf_nf_ct_alloc_entry(struct net *net, struct bpf_sock_tuple *bpf_tuple,
u32 timeout)
{
struct nf_conntrack_tuple otuple, rtuple;
+ struct nf_conntrack_zone ct_zone;
struct nf_conn *ct;
int err;
- if (!opts || !bpf_tuple || opts->reserved[0] || opts->reserved[1] ||
- opts_len != NF_BPF_CT_OPTS_SZ)
+ if (!opts || !bpf_tuple)
return ERR_PTR(-EINVAL);
+ if (!(opts_len == NF_BPF_CT_OPTS_SZ || opts_len == 12))
+ return ERR_PTR(-EINVAL);
+ if (opts_len == NF_BPF_CT_OPTS_SZ) {
+ if (opts->reserved[0] || opts->reserved[1] || opts->reserved[2])
+ return ERR_PTR(-EINVAL);
+ } else {
+ if (opts->ct_zone_id)
+ return ERR_PTR(-EINVAL);
+ }
if (unlikely(opts->netns_id < BPF_F_CURRENT_NETNS))
return ERR_PTR(-EINVAL);
@@ -130,7 +145,16 @@ __bpf_nf_ct_alloc_entry(struct net *net, struct bpf_sock_tuple *bpf_tuple,
return ERR_PTR(-ENONET);
}
- ct = nf_conntrack_alloc(net, &nf_ct_zone_dflt, &otuple, &rtuple,
+ if (opts_len == NF_BPF_CT_OPTS_SZ) {
+ if (opts->ct_zone_dir == 0)
+ opts->ct_zone_dir = NF_CT_DEFAULT_ZONE_DIR;
+ nf_ct_zone_init(&ct_zone,
+ opts->ct_zone_id, opts->ct_zone_dir, 0);
+ } else {
+ ct_zone = nf_ct_zone_dflt;
+ }
+
+ ct = nf_conntrack_alloc(net, &ct_zone, &otuple, &rtuple,
GFP_ATOMIC);
if (IS_ERR(ct))
goto out;
@@ -152,12 +176,21 @@ static struct nf_conn *__bpf_nf_ct_lookup(struct net *net,
{
struct nf_conntrack_tuple_hash *hash;
struct nf_conntrack_tuple tuple;
+ struct nf_conntrack_zone ct_zone;
struct nf_conn *ct;
int err;
- if (!opts || !bpf_tuple || opts->reserved[0] || opts->reserved[1] ||
- opts_len != NF_BPF_CT_OPTS_SZ)
+ if (!opts || !bpf_tuple)
return ERR_PTR(-EINVAL);
+ if (!(opts_len == NF_BPF_CT_OPTS_SZ || opts_len == 12))
+ return ERR_PTR(-EINVAL);
+ if (opts_len == NF_BPF_CT_OPTS_SZ) {
+ if (opts->reserved[0] || opts->reserved[1] || opts->reserved[2])
+ return ERR_PTR(-EINVAL);
+ } else {
+ if (opts->ct_zone_id)
+ return ERR_PTR(-EINVAL);
+ }
if (unlikely(opts->l4proto != IPPROTO_TCP && opts->l4proto != IPPROTO_UDP))
return ERR_PTR(-EPROTO);
if (unlikely(opts->netns_id < BPF_F_CURRENT_NETNS))
@@ -174,7 +207,16 @@ static struct nf_conn *__bpf_nf_ct_lookup(struct net *net,
return ERR_PTR(-ENONET);
}
- hash = nf_conntrack_find_get(net, &nf_ct_zone_dflt, &tuple);
+ if (opts_len == NF_BPF_CT_OPTS_SZ) {
+ if (opts->ct_zone_dir == 0)
+ opts->ct_zone_dir = NF_CT_DEFAULT_ZONE_DIR;
+ nf_ct_zone_init(&ct_zone,
+ opts->ct_zone_id, opts->ct_zone_dir, 0);
+ } else {
+ ct_zone = nf_ct_zone_dflt;
+ }
+
+ hash = nf_conntrack_find_get(net, &ct_zone, &tuple);
if (opts->netns_id >= 0)
put_net(net);
if (!hash)
@@ -245,7 +287,7 @@ __bpf_kfunc_start_defs();
* @opts - Additional options for allocation (documented above)
* Cannot be NULL
* @opts__sz - Length of the bpf_ct_opts structure
- * Must be NF_BPF_CT_OPTS_SZ (12)
+ * Must be NF_BPF_CT_OPTS_SZ (16) or 12
*/
__bpf_kfunc struct nf_conn___init *
bpf_xdp_ct_alloc(struct xdp_md *xdp_ctx, struct bpf_sock_tuple *bpf_tuple,
@@ -279,7 +321,7 @@ bpf_xdp_ct_alloc(struct xdp_md *xdp_ctx, struct bpf_sock_tuple *bpf_tuple,
* @opts - Additional options for lookup (documented above)
* Cannot be NULL
* @opts__sz - Length of the bpf_ct_opts structure
- * Must be NF_BPF_CT_OPTS_SZ (12)
+ * Must be NF_BPF_CT_OPTS_SZ (16) or 12
*/
__bpf_kfunc struct nf_conn *
bpf_xdp_ct_lookup(struct xdp_md *xdp_ctx, struct bpf_sock_tuple *bpf_tuple,
@@ -312,7 +354,7 @@ bpf_xdp_ct_lookup(struct xdp_md *xdp_ctx, struct bpf_sock_tuple *bpf_tuple,
* @opts - Additional options for allocation (documented above)
* Cannot be NULL
* @opts__sz - Length of the bpf_ct_opts structure
- * Must be NF_BPF_CT_OPTS_SZ (12)
+ * Must be NF_BPF_CT_OPTS_SZ (16) or 12
*/
__bpf_kfunc struct nf_conn___init *
bpf_skb_ct_alloc(struct __sk_buff *skb_ctx, struct bpf_sock_tuple *bpf_tuple,
@@ -347,7 +389,7 @@ bpf_skb_ct_alloc(struct __sk_buff *skb_ctx, struct bpf_sock_tuple *bpf_tuple,
* @opts - Additional options for lookup (documented above)
* Cannot be NULL
* @opts__sz - Length of the bpf_ct_opts structure
- * Must be NF_BPF_CT_OPTS_SZ (12)
+ * Must be NF_BPF_CT_OPTS_SZ (16) or 12
*/
__bpf_kfunc struct nf_conn *
bpf_skb_ct_lookup(struct __sk_buff *skb_ctx, struct bpf_sock_tuple *bpf_tuple,
--
2.34.1
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