@@ -57,16 +57,19 @@ enum {
static struct nf_conn *__bpf_nf_ct_lookup(struct net *net,
struct bpf_sock_tuple *bpf_tuple,
- u32 tuple_len, u8 protonum,
- s32 netns_id, u8 *dir)
+ u32 tuple_len, struct bpf_ct_opts *opts,
+ u32 opts_len)
{
struct nf_conntrack_tuple_hash *hash;
struct nf_conntrack_tuple tuple;
struct nf_conn *ct;
- if (unlikely(protonum != IPPROTO_TCP && protonum != IPPROTO_UDP))
+ if (!opts || !bpf_tuple || opts->reserved[0] || opts->reserved[1] ||
+ opts_len != NF_BPF_CT_OPTS_SZ)
+ return ERR_PTR(-EINVAL);
+ if (unlikely(opts->l4proto != IPPROTO_TCP && opts->l4proto != IPPROTO_UDP))
return ERR_PTR(-EPROTO);
- if (unlikely(netns_id < BPF_F_CURRENT_NETNS))
+ if (unlikely(opts->netns_id < BPF_F_CURRENT_NETNS))
return ERR_PTR(-EINVAL);
memset(&tuple, 0, sizeof(tuple));
@@ -89,23 +92,22 @@ static struct nf_conn *__bpf_nf_ct_lookup(struct net *net,
return ERR_PTR(-EAFNOSUPPORT);
}
- tuple.dst.protonum = protonum;
+ tuple.dst.protonum = opts->l4proto;
- if (netns_id >= 0) {
- net = get_net_ns_by_id(net, netns_id);
+ if (opts->netns_id >= 0) {
+ net = get_net_ns_by_id(net, opts->netns_id);
if (unlikely(!net))
return ERR_PTR(-ENONET);
}
hash = nf_conntrack_find_get(net, &nf_ct_zone_dflt, &tuple);
- if (netns_id >= 0)
+ if (opts->netns_id >= 0)
put_net(net);
if (!hash)
return ERR_PTR(-ENOENT);
ct = nf_ct_tuplehash_to_ctrack(hash);
- if (dir)
- *dir = NF_CT_DIRECTION(hash);
+ opts->dir = NF_CT_DIRECTION(hash);
return ct;
}
@@ -138,20 +140,11 @@ bpf_xdp_ct_lookup(struct xdp_md *xdp_ctx, struct bpf_sock_tuple *bpf_tuple,
struct net *caller_net;
struct nf_conn *nfct;
- BUILD_BUG_ON(sizeof(struct bpf_ct_opts) != NF_BPF_CT_OPTS_SZ);
-
- if (!opts)
- return NULL;
- if (!bpf_tuple || opts->reserved[0] || opts->reserved[1] ||
- opts__sz != NF_BPF_CT_OPTS_SZ) {
- opts->error = -EINVAL;
- return NULL;
- }
caller_net = dev_net(ctx->rxq->dev);
- nfct = __bpf_nf_ct_lookup(caller_net, bpf_tuple, tuple__sz, opts->l4proto,
- opts->netns_id, &opts->dir);
+ nfct = __bpf_nf_ct_lookup(caller_net, bpf_tuple, tuple__sz, opts, opts__sz);
if (IS_ERR(nfct)) {
- opts->error = PTR_ERR(nfct);
+ if (opts)
+ opts->error = PTR_ERR(nfct);
return NULL;
}
return nfct;
@@ -181,20 +174,11 @@ bpf_skb_ct_lookup(struct __sk_buff *skb_ctx, struct bpf_sock_tuple *bpf_tuple,
struct net *caller_net;
struct nf_conn *nfct;
- BUILD_BUG_ON(sizeof(struct bpf_ct_opts) != NF_BPF_CT_OPTS_SZ);
-
- if (!opts)
- return NULL;
- if (!bpf_tuple || opts->reserved[0] || opts->reserved[1] ||
- opts__sz != NF_BPF_CT_OPTS_SZ) {
- opts->error = -EINVAL;
- return NULL;
- }
caller_net = skb->dev ? dev_net(skb->dev) : sock_net(skb->sk);
- nfct = __bpf_nf_ct_lookup(caller_net, bpf_tuple, tuple__sz, opts->l4proto,
- opts->netns_id, &opts->dir);
+ nfct = __bpf_nf_ct_lookup(caller_net, bpf_tuple, tuple__sz, opts, opts__sz);
if (IS_ERR(nfct)) {
- opts->error = PTR_ERR(nfct);
+ if (opts)
+ opts->error = PTR_ERR(nfct);
return NULL;
}
return nfct;
Move common checks inside the common function, and maintain the only difference the two being how to obtain the struct net * from ctx. No functional change intended. Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com> --- net/netfilter/nf_conntrack_bpf.c | 52 +++++++++++--------------------- 1 file changed, 18 insertions(+), 34 deletions(-)