filter: refactor common filter attach code into __sk_attach_prog
Both sk_attach_filter() and sk_attach_bpf() are setting up sk_filter, charging skmem and attaching it to the socket after we got the eBPF prog up and ready. Lets refactor that into a common helper. Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -1019,6 +1019,32 @@ void bpf_prog_destroy(struct bpf_prog *fp)
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}
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EXPORT_SYMBOL_GPL(bpf_prog_destroy);
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static int __sk_attach_prog(struct bpf_prog *prog, struct sock *sk)
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{
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struct sk_filter *fp, *old_fp;
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fp = kmalloc(sizeof(*fp), GFP_KERNEL);
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if (!fp)
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return -ENOMEM;
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fp->prog = prog;
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atomic_set(&fp->refcnt, 0);
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if (!sk_filter_charge(sk, fp)) {
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kfree(fp);
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return -ENOMEM;
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}
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old_fp = rcu_dereference_protected(sk->sk_filter,
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sock_owned_by_user(sk));
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rcu_assign_pointer(sk->sk_filter, fp);
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if (old_fp)
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sk_filter_uncharge(sk, old_fp);
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return 0;
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}
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/**
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* sk_attach_filter - attach a socket filter
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* @fprog: the filter program
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@ -1031,7 +1057,6 @@ EXPORT_SYMBOL_GPL(bpf_prog_destroy);
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*/
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int sk_attach_filter(struct sock_fprog *fprog, struct sock *sk)
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{
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struct sk_filter *fp, *old_fp;
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unsigned int fsize = bpf_classic_proglen(fprog);
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unsigned int bpf_fsize = bpf_prog_size(fprog->len);
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struct bpf_prog *prog;
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@ -1068,26 +1093,11 @@ int sk_attach_filter(struct sock_fprog *fprog, struct sock *sk)
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if (IS_ERR(prog))
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return PTR_ERR(prog);
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fp = kmalloc(sizeof(*fp), GFP_KERNEL);
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if (!fp) {
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err = __sk_attach_prog(prog, sk);
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if (err < 0) {
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__bpf_prog_release(prog);
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return -ENOMEM;
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return err;
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}
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fp->prog = prog;
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atomic_set(&fp->refcnt, 0);
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if (!sk_filter_charge(sk, fp)) {
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__sk_filter_release(fp);
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return -ENOMEM;
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}
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old_fp = rcu_dereference_protected(sk->sk_filter,
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sock_owned_by_user(sk));
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rcu_assign_pointer(sk->sk_filter, fp);
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if (old_fp)
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sk_filter_uncharge(sk, old_fp);
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return 0;
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}
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@ -1095,8 +1105,8 @@ EXPORT_SYMBOL_GPL(sk_attach_filter);
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int sk_attach_bpf(u32 ufd, struct sock *sk)
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{
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struct sk_filter *fp, *old_fp;
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struct bpf_prog *prog;
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int err;
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if (sock_flag(sk, SOCK_FILTER_LOCKED))
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return -EPERM;
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@ -1110,27 +1120,12 @@ int sk_attach_bpf(u32 ufd, struct sock *sk)
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return -EINVAL;
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}
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fp = kmalloc(sizeof(*fp), GFP_KERNEL);
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if (!fp) {
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err = __sk_attach_prog(prog, sk);
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if (err < 0) {
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bpf_prog_put(prog);
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return -ENOMEM;
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return err;
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}
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fp->prog = prog;
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atomic_set(&fp->refcnt, 0);
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if (!sk_filter_charge(sk, fp)) {
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__sk_filter_release(fp);
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return -ENOMEM;
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}
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old_fp = rcu_dereference_protected(sk->sk_filter,
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sock_owned_by_user(sk));
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rcu_assign_pointer(sk->sk_filter, fp);
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if (old_fp)
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sk_filter_uncharge(sk, old_fp);
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return 0;
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}
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