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| author | Martin KaFai Lau <kafai@fb.com> | 2020-10-01 18:34:48 -0700 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2020-10-02 11:34:48 -0700 |
| commit | 82f45c6c4a70622cc0585e3f4372e192a6491d26 (patch) | |
| tree | f6490cacf4745d061f2e99ebc75b7e5566c02763 /include | |
| parent | 48ca6243c6adf1a3d7e7a0fd519ba918eb7b00ca (diff) | |
| download | linux-stable-82f45c6c4a70622cc0585e3f4372e192a6491d26.tar.gz linux-stable-82f45c6c4a70622cc0585e3f4372e192a6491d26.tar.bz2 linux-stable-82f45c6c4a70622cc0585e3f4372e192a6491d26.zip | |
bpf: tcp: Do not limit cb_flags when creating child sk from listen sk
The commit 0813a841566f ("bpf: tcp: Allow bpf prog to write and parse TCP header option")
unnecessarily introduced bpf_skops_init_child() which limited the child
sk from inheriting all bpf_sock_ops_cb_flags of the listen sk. That
breaks existing user expectation.
This patch removes the bpf_skops_init_child() and just allows
sock_copy() to do its job to copy everything from listen sk to
the child sk.
Fixes: 0813a841566f ("bpf: tcp: Allow bpf prog to write and parse TCP header option")
Reported-by: Stanislav Fomichev <sdf@google.com>
Signed-off-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20201002013448.2542025-1-kafai@fb.com
Diffstat (limited to 'include')
| -rw-r--r-- | include/net/tcp.h | 33 |
1 files changed, 0 insertions, 33 deletions
diff --git a/include/net/tcp.h b/include/net/tcp.h index 3601dea931a6..d4ef5bf94168 100644 --- a/include/net/tcp.h +++ b/include/net/tcp.h @@ -2228,34 +2228,6 @@ int __tcp_bpf_recvmsg(struct sock *sk, struct sk_psock *psock, #endif /* CONFIG_NET_SOCK_MSG */ #ifdef CONFIG_CGROUP_BPF -/* Copy the listen sk's HDR_OPT_CB flags to its child. - * - * During 3-Way-HandShake, the synack is usually sent from - * the listen sk with the HDR_OPT_CB flags set so that - * bpf-prog will be called to write the BPF hdr option. - * - * In fastopen, the child sk is used to send synack instead - * of the listen sk. Thus, inheriting the HDR_OPT_CB flags - * from the listen sk gives the bpf-prog a chance to write - * BPF hdr option in the synack pkt during fastopen. - * - * Both fastopen and non-fastopen child will inherit the - * HDR_OPT_CB flags to keep the bpf-prog having a consistent - * behavior when deciding to clear this cb flags (or not) - * during the PASSIVE_ESTABLISHED_CB. - * - * In the future, other cb flags could be inherited here also. - */ -static inline void bpf_skops_init_child(const struct sock *sk, - struct sock *child) -{ - tcp_sk(child)->bpf_sock_ops_cb_flags = - tcp_sk(sk)->bpf_sock_ops_cb_flags & - (BPF_SOCK_OPS_PARSE_ALL_HDR_OPT_CB_FLAG | - BPF_SOCK_OPS_PARSE_UNKNOWN_HDR_OPT_CB_FLAG | - BPF_SOCK_OPS_WRITE_HDR_OPT_CB_FLAG); -} - static inline void bpf_skops_init_skb(struct bpf_sock_ops_kern *skops, struct sk_buff *skb, unsigned int end_offset) @@ -2264,11 +2236,6 @@ static inline void bpf_skops_init_skb(struct bpf_sock_ops_kern *skops, skops->skb_data_end = skb->data + end_offset; } #else -static inline void bpf_skops_init_child(const struct sock *sk, - struct sock *child) -{ -} - static inline void bpf_skops_init_skb(struct bpf_sock_ops_kern *skops, struct sk_buff *skb, unsigned int end_offset) |