Sabrina Dubroca 2c7269b231 bpf: tcp: Recv() should return 0 when the peer socket is closed ... If the peer is closed, we will never get more data, so tcp_bpf_wait_data will get stuck forever. In case we passed MSG_DONTWAIT to recv(), we get EAGAIN but we should actually get 0. >From man 2 recv: RETURN VALUE When a stream socket peer has performed an orderly shutdown, the return value will be 0 (the traditional "end-of-file" return). This patch makes tcp_bpf_wait_data always return 1 when the peer socket has been shutdown. Either we have data available, and it would have returned 1 anyway, or there isn't, in which case we'll call tcp_recvmsg which does the right thing in this situation. Fixes: 604326b41a ("bpf, sockmap: convert to generic sk_msg interface") Signed-off-by: Sabrina Dubroca <sd@queasysnail.net> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Acked-by: Jakub Sitnicki <jakub@cloudflare.com> Link: https://lore.kernel.org/bpf/26038a28c21fea5d04d4bd4744c5686d3f2e5504.1591784177.git.sd@queasysnail.net		2020-06-12 15:10:12 -07:00
..
6lowpan
9p
802
8021q	netpoll: accept NULL np argument in netpoll_send_skb()	2020-05-07 18:11:07 -07:00
appletalk	ipv4,appletalk: move SIOCADDRT and SIOCDELRT handling into ->compat_ioctl	2020-05-18 17:35:02 -07:00
atm	atm: switch do_atmif_sioc() to direct use of atm_dev_ioctl()	2020-05-20 20:31:36 -04:00
ax25	Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net	2020-05-24 13:47:27 -07:00
batman-adv	This cleanup patchset includes the following patches:	2020-05-26 15:19:29 -07:00
bluetooth	Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next	2020-06-03 16:27:18 -07:00
bpf	bpf: Fix too large copy from user in bpf_test_init	2020-05-19 17:56:34 +02:00
bpfilter	SPDX patches for 5.7-rc1.	2020-04-03 13:12:26 -07:00
bridge	Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next	2020-06-03 16:27:18 -07:00
caif	net: caif: Fix use correct return type for ndo_start_xmit()	2020-04-30 12:13:07 -07:00
can
ceph	Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next	2020-06-03 16:27:18 -07:00
core	net/filter: Permit reading NET in load_bytes_relative when MAC not set	2020-06-11 16:05:56 +02:00
dcb
dccp	ipv6: move SIOCADDRT and SIOCDELRT handling into ->compat_ioctl	2020-05-18 17:35:02 -07:00
decnet	Merge git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next	2020-05-01 17:02:27 -07:00
dns_resolver	docs: networking: convert dns_resolver.txt to ReST	2020-04-28 14:39:46 -07:00
dsa	Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net	2020-05-31 17:48:46 -07:00
ethernet	net: move devres helpers into a separate source file	2020-05-23 16:56:17 -07:00
ethtool	net: ethtool: cabletest: Make ethnl_act_cable_test_tdr_cfg static	2020-05-29 17:28:30 -07:00
hsr	hsr: remove WARN_ONCE() in hsr_fill_frame_info()	2020-05-07 17:40:02 -07:00
ieee802154	ieee802154: 6lowpan: remove unnecessary comparison	2020-05-08 22:25:10 -07:00
ife
ipv4	bpf: tcp: Recv() should return 0 when the peer socket is closed	2020-06-12 15:10:12 -07:00
ipv6	Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next	2020-06-03 16:27:18 -07:00
iucv	net/af_iucv: clean up function prototypes	2020-05-19 12:50:14 -07:00
kcm
key
l2tp	Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net	2020-05-31 17:48:46 -07:00
l3mdev
lapb	docs: networking: convert lapb-module.txt to ReST	2020-04-30 12:56:35 -07:00
llc
mac80211	Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net	2020-05-31 17:48:46 -07:00
mac802154
mpls	net: Make mpls_entry_encode() available for generic users	2020-05-29 21:20:20 -07:00
mptcp	Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next	2020-06-03 16:27:18 -07:00
ncsi
netfilter	Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next	2020-06-03 16:27:18 -07:00
netlabel	netlabel: cope with NULL catmap	2020-05-12 18:12:40 -07:00
netlink	bpf: Enable bpf_iter targets registering ctx argument types	2020-05-13 12:30:50 -07:00
netrom	net: partially revert dynamic lockdep key changes	2020-05-04 12:05:56 -07:00
nfc
nsh
openvswitch	net: openvswitch: use div_u64() for 64-by-32 divisions	2020-04-25 20:48:21 -07:00
packet
phonet	sysctl: pass kernel pointers to ->proc_handler	2020-04-27 02:07:40 -04:00
psample	net: psample: fix build error when CONFIG_INET is not enabled	2020-05-23 16:36:05 -07:00
qrtr	Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net	2020-05-31 17:48:46 -07:00
rds	tcp: add tcp_sock_set_keepcnt	2020-05-28 11:11:45 -07:00
rfkill
rose	net: partially revert dynamic lockdep key changes	2020-05-04 12:05:56 -07:00
rxrpc	rxrpc: add rxrpc_sock_set_min_security_level	2020-05-28 11:11:46 -07:00
sched	cls_flower: remove mpls_opts_policy	2020-06-01 12:01:05 -07:00
sctp	Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next	2020-06-03 16:27:18 -07:00
smc	Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next	2020-06-03 16:27:18 -07:00
strparser
sunrpc	ipv6: add ip6_sock_set_recvpktinfo	2020-05-28 11:11:46 -07:00
switchdev
tipc	Revert "tipc: Fix potential tipc_aead refcnt leak in tipc_crypto_rcv"	2020-06-02 15:13:47 -07:00
tls	bpf: Fix running sk_skb program types with ktls	2020-06-01 14:48:32 -07:00
unix
vmw_vsock	virtio_vsock: Fix race condition in virtio_transport_recv_pkt	2020-05-30 17:44:01 -07:00
wimax
wireless	Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net	2020-05-31 17:48:46 -07:00
x25	Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net	2020-05-06 22:10:13 -07:00
xdp	xdp: Fix xsk_generic_xmit errno	2020-06-11 23:44:33 +02:00
xfrm	Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net	2020-05-31 17:48:46 -07:00
compat.c	switch cmsghdr_from_user_compat_to_kern() to copy_from_user()	2020-06-01 12:05:45 -07:00
devres.c	net: devres: provide devm_register_netdev()	2020-05-23 16:56:17 -07:00
Kconfig	net: ethtool: netlink: Add support for triggering a cable test	2020-05-10 12:28:41 -07:00
Makefile	net: move devres helpers into a separate source file	2020-05-23 16:56:17 -07:00
socket.c	net: remove kernel_setsockopt	2020-05-29 13:10:39 -07:00
sysctl_net.c