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2016-07-25kcm: remove redundant -ve error check and return pathColin Ian King
The check for a -ve error is redundant, remove it and just immediately return the return value from the call to seq_open_net. Signed-off-by: Colin Ian King <colin.king@canonical.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2016-07-01bpf: refactor bpf_prog_get and type check into helperDaniel Borkmann
Since bpf_prog_get() and program type check is used in a couple of places, refactor this into a small helper function that we can make use of. Since the non RO prog->aux part is not used in performance critical paths and a program destruction via RCU is rather very unlikley when doing the put, we shouldn't have an issue just doing the bpf_prog_get() + prog->type != type check, but actually not taking the ref at all (due to being in fdget() / fdput() section of the bpf fd) is even cleaner and makes the diff smaller as well, so just go for that. Callsites are changed to make use of the new helper where possible. Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2016-06-22kcm: fix /proc memory leakJiri Slaby
Every open of /proc/net/kcm leaks 16 bytes of memory as is reported by kmemleak: unreferenced object 0xffff88059c0e3458 (size 192): comm "cat", pid 1401, jiffies 4294935742 (age 310.720s) hex dump (first 32 bytes): 28 45 71 96 05 88 ff ff 00 10 00 00 00 00 00 00 (Eq............. 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace: [<ffffffff8156a2de>] kmem_cache_alloc_trace+0x16e/0x230 [<ffffffff8162a479>] seq_open+0x79/0x1d0 [<ffffffffa0578510>] kcm_seq_open+0x0/0x30 [kcm] [<ffffffff8162a479>] seq_open+0x79/0x1d0 [<ffffffff8162a8cf>] __seq_open_private+0x2f/0xa0 [<ffffffff81712548>] seq_open_net+0x38/0xa0 ... It is caused by a missing free in the ->release path. So fix it by providing seq_release_net as the ->release method. Signed-off-by: Jiri Slaby <jslaby@suse.cz> Fixes: cd6e111bf5 (kcm: Add statistics and proc interfaces) Cc: "David S. Miller" <davem@davemloft.net> Cc: Tom Herbert <tom@herbertland.com> Cc: netdev@vger.kernel.org Signed-off-by: David S. Miller <davem@davemloft.net>
2016-05-19kcm: fix a signedness in kcm_splice_read()WANG Cong
skb_splice_bits() returns int, kcm_splice_read() returns ssize_t, both are signed. We may need another patch to make them all ssize_t, but that deserves a separated patch. Fixes: 91687355b927 ("kcm: Splice support") Reported-by: David Binderman <linuxdev.baldrick@gmail.com> Cc: Tom Herbert <tom@herbertland.com> Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2016-03-09kcm: Add receive message timeoutTom Herbert
This patch adds receive timeout for message assembly on the attached TCP sockets. The timeout is set when a new messages is started and the whole message has not been received by TCP (not in the receive queue). If the completely message is subsequently received the timer is cancelled, if the timer expires the RX side is aborted. The timeout value is taken from the socket timeout (SO_RCVTIMEO) that is set on a TCP socket (i.e. set by get sockopt before attaching a TCP socket to KCM. Signed-off-by: Tom Herbert <tom@herbertland.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2016-03-09kcm: Add memory limit for receive message constructionTom Herbert
Message assembly is performed on the TCP socket. This is logically equivalent of an application that performs a peek on the socket to find out how much memory is needed for a receive buffer. The receive socket buffer also provides the maximum message size which is checked. The receive algorithm is something like: 1) Receive the first skbuf for a message (or skbufs if multiple are needed to determine message length). 2) Check the message length against the number of bytes in the TCP receive queue (tcp_inq()). - If all the bytes of the message are in the queue (incluing the skbuf received), then proceed with message assembly (it should complete with the tcp_read_sock) - Else, mark the psock with the number of bytes needed to complete the message. 3) In TCP data ready function, if the psock indicates that we are waiting for the rest of the bytes of a messages, check the number of queued bytes against that. - If there are still not enough bytes for the message, just return - Else, clear the waiting bytes and proceed to receive the skbufs. The message should now be received in one tcp_read_sock Signed-off-by: Tom Herbert <tom@herbertland.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2016-03-09kcm: Sendpage supportTom Herbert
Implement kcm_sendpage. Set in sendpage to kcm_sendpage in both dgram and seqpacket ops. Signed-off-by: Tom Herbert <tom@herbertland.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2016-03-09kcm: Splice supportTom Herbert
Implement kcm_splice_read. This is supported only for seqpacket. Add kcm_seqpacket_ops and set splice read to kcm_splice_read. Signed-off-by: Tom Herbert <tom@herbertland.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2016-03-09kcm: Add statistics and proc interfacesTom Herbert
This patch adds various counters for KCM. These include counters for messages and bytes received or sent, as well as counters for number of attached/unattached TCP sockets and other error or edge events. The statistics are exposed via a proc interface. /proc/net/kcm provides statistics per KCM socket and per psock (attached TCP sockets). /proc/net/kcm_stats provides aggregate statistics. Signed-off-by: Tom Herbert <tom@herbertland.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2016-03-09kcm: Kernel Connection Multiplexor moduleTom Herbert
This module implements the Kernel Connection Multiplexor. Kernel Connection Multiplexor (KCM) is a facility that provides a message based interface over TCP for generic application protocols. With KCM an application can efficiently send and receive application protocol messages over TCP using datagram sockets. For more information see the included Documentation/networking/kcm.txt Signed-off-by: Tom Herbert <tom@herbertland.com> Signed-off-by: David S. Miller <davem@davemloft.net>