From: Jakub Sitnicki <jakub@cloudflare.com>
To: John Fastabend <john.fastabend@gmail.com>
Cc: bpf@vger.kernel.org, netdev@vger.kernel.org,
kernel-team@cloudflare.com, Eric Dumazet <edumazet@google.com>,
Lorenz Bauer <lmb@cloudflare.com>,
Martin KaFai Lau <kafai@fb.com>
Subject: Re: [PATCH bpf-next v2 04/11] tcp_bpf: Don't let child socket inherit parent protocol ops on copy
Date: Mon, 13 Jan 2020 23:31:43 +0100 [thread overview]
Message-ID: <87h80zrnsg.fsf@cloudflare.com> (raw)
In-Reply-To: <5e1a5ed97885d_1e7f2b0c859c45c0d7@john-XPS-13-9370.notmuch>
On Sun, Jan 12, 2020 at 12:48 AM CET, John Fastabend wrote:
> Jakub Sitnicki wrote:
>> Prepare for cloning listening sockets that have their protocol callbacks
>> overridden by sk_msg. Child sockets must not inherit parent callbacks that
>> access state stored in sk_user_data owned by the parent.
>>
>> Restore the child socket protocol callbacks before the it gets hashed and
>> any of the callbacks can get invoked.
>>
>> Signed-off-by: Jakub Sitnicki <jakub@cloudflare.com>
>> ---
>> include/net/tcp.h | 1 +
>> net/ipv4/tcp_bpf.c | 13 +++++++++++++
>> net/ipv4/tcp_minisocks.c | 2 ++
>> 3 files changed, 16 insertions(+)
>>
>> diff --git a/include/net/tcp.h b/include/net/tcp.h
>> index 9dd975be7fdf..7cbf9465bb10 100644
>> --- a/include/net/tcp.h
>> +++ b/include/net/tcp.h
>> @@ -2181,6 +2181,7 @@ int tcp_bpf_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
>> int nonblock, int flags, int *addr_len);
>> int __tcp_bpf_recvmsg(struct sock *sk, struct sk_psock *psock,
>> struct msghdr *msg, int len, int flags);
>> +void tcp_bpf_clone(const struct sock *sk, struct sock *child);
>>
>> /* Call BPF_SOCK_OPS program that returns an int. If the return value
>> * is < 0, then the BPF op failed (for example if the loaded BPF
>> diff --git a/net/ipv4/tcp_bpf.c b/net/ipv4/tcp_bpf.c
>> index f6c83747c71e..6f96320fb7cf 100644
>> --- a/net/ipv4/tcp_bpf.c
>> +++ b/net/ipv4/tcp_bpf.c
>> @@ -586,6 +586,19 @@ static void tcp_bpf_close(struct sock *sk, long timeout)
>> saved_close(sk, timeout);
>> }
>>
>> +/* If a child got cloned from a listening socket that had tcp_bpf
>> + * protocol callbacks installed, we need to restore the callbacks to
>> + * the default ones because the child does not inherit the psock state
>> + * that tcp_bpf callbacks expect.
>> + */
>> +void tcp_bpf_clone(const struct sock *sk, struct sock *newsk)
>> +{
>> + struct proto *prot = newsk->sk_prot;
>> +
>> + if (prot->recvmsg == tcp_bpf_recvmsg)
>> + newsk->sk_prot = sk->sk_prot_creator;
>> +}
>> +
>
> ^^^^ probably needs to go into tcp.h wrapped in ifdef NET_SOCK_MSG with
> a stub for ifndef NET_SOCK_MSG case.
>
> Looks like build bot also caught this.
Oops, I need to add NET_SOCK_MSG to my build matrix :-)
next prev parent reply other threads:[~2020-01-13 22:31 UTC|newest]
Thread overview: 49+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-10 10:50 [PATCH bpf-next v2 00/11] Extend SOCKMAP to store listening sockets Jakub Sitnicki
2020-01-10 10:50 ` [PATCH bpf-next v2 01/11] bpf, sk_msg: Don't reset saved sock proto on restore Jakub Sitnicki
2020-01-11 22:50 ` John Fastabend
2020-01-10 10:50 ` [PATCH bpf-next v2 02/11] net, sk_msg: Annotate lockless access to sk_prot on clone Jakub Sitnicki
2020-01-11 23:14 ` John Fastabend
2020-01-13 15:09 ` Jakub Sitnicki
2020-01-14 3:14 ` John Fastabend
2020-01-20 17:00 ` John Fastabend
2020-01-20 18:11 ` Jakub Sitnicki
2020-01-21 12:42 ` Jakub Sitnicki
2020-01-10 10:50 ` [PATCH bpf-next v2 03/11] net, sk_msg: Clear sk_user_data pointer on clone if tagged Jakub Sitnicki
2020-01-11 23:38 ` John Fastabend
2020-01-12 12:55 ` kbuild test robot
2020-01-13 20:15 ` Martin Lau
2020-01-14 16:04 ` Jakub Sitnicki
2020-01-10 10:50 ` [PATCH bpf-next v2 04/11] tcp_bpf: Don't let child socket inherit parent protocol ops on copy Jakub Sitnicki
2020-01-11 2:42 ` kbuild test robot
2020-01-11 3:02 ` kbuild test robot
2020-01-11 23:48 ` John Fastabend
2020-01-13 22:31 ` Jakub Sitnicki [this message]
2020-01-13 22:23 ` Martin Lau
2020-01-13 22:42 ` Jakub Sitnicki
2020-01-13 23:23 ` Martin Lau
2020-01-10 10:50 ` [PATCH bpf-next v2 05/11] bpf, sockmap: Allow inserting listening TCP sockets into sockmap Jakub Sitnicki
2020-01-11 23:59 ` John Fastabend
2020-01-13 15:48 ` Jakub Sitnicki
2020-01-10 10:50 ` [PATCH bpf-next v2 06/11] bpf, sockmap: Don't set up sockmap progs for listening sockets Jakub Sitnicki
2020-01-12 0:51 ` John Fastabend
2020-01-12 1:07 ` John Fastabend
2020-01-13 17:59 ` Jakub Sitnicki
2020-01-10 10:50 ` [PATCH bpf-next v2 07/11] bpf, sockmap: Return socket cookie on lookup from syscall Jakub Sitnicki
2020-01-12 0:56 ` John Fastabend
2020-01-13 23:12 ` Martin Lau
2020-01-14 3:16 ` John Fastabend
2020-01-14 15:48 ` Jakub Sitnicki
2020-01-10 10:50 ` [PATCH bpf-next v2 08/11] bpf, sockmap: Let all kernel-land lookup values in SOCKMAP Jakub Sitnicki
2020-01-10 10:50 ` [PATCH bpf-next v2 09/11] bpf: Allow selecting reuseport socket from a SOCKMAP Jakub Sitnicki
2020-01-12 1:00 ` John Fastabend
2020-01-13 23:45 ` Martin Lau
2020-01-15 12:41 ` Jakub Sitnicki
2020-01-13 23:51 ` Martin Lau
2020-01-15 12:57 ` Jakub Sitnicki
2020-01-10 10:50 ` [PATCH bpf-next v2 10/11] selftests/bpf: Extend SK_REUSEPORT tests to cover SOCKMAP Jakub Sitnicki
2020-01-12 1:01 ` John Fastabend
2020-01-10 10:50 ` [PATCH bpf-next v2 11/11] selftests/bpf: Tests for SOCKMAP holding listening sockets Jakub Sitnicki
2020-01-12 1:06 ` John Fastabend
2020-01-13 15:58 ` Jakub Sitnicki
2020-01-11 0:18 ` [PATCH bpf-next v2 00/11] Extend SOCKMAP to store " Alexei Starovoitov
2020-01-11 22:47 ` John Fastabend
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