Yonghong Song 9d0b3c1f14 tools/bpf: fix a netlink recv issue ... Commit f7010770fb ("tools/bpf: move bpf/lib netlink related functions into a new file") introduced a while loop for the netlink recv path. This while loop is needed since the buffer in recv syscall may not be enough to hold all the information and in such cases multiple recv calls are needed. There is a bug introduced by the above commit as the while loop may block on recv syscall if there is no more messages are expected. The netlink message header flag NLM_F_MULTI is used to indicate that more messages are expected and this patch fixed the bug by doing further recv syscall only if multipart message is expected. The patch added another fix regarding to message length of 0. When netlink recv returns message length of 0, there will be no more messages for returning data so the while loop can end. Fixes: f7010770fb ("tools/bpf: move bpf/lib netlink related functions into a new file") Reported-by: Björn Töpel <bjorn.topel@intel.com> Tested-by: Björn Töpel <bjorn.topel@intel.com> Signed-off-by: Yonghong Song <yhs@fb.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org>		2018-09-11 14:26:30 -07:00
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.gitignore	tools lib bpf: Change FEATURE-DUMP to FEATURE-DUMP.libbpf	2015-11-05 12:47:51 -03:00
bpf.c	tools/bpf: move bpf/lib netlink related functions into a new file	2018-09-06 22:34:08 -07:00
bpf.h	bpf: Test BPF_PROG_TYPE_SK_REUSEPORT	2018-08-11 01:58:46 +02:00
btf.c	Merge ra.kernel.org:/pub/scm/linux/kernel/git/davem/net	2018-08-11 17:52:00 -07:00
btf.h	Merge ra.kernel.org:/pub/scm/linux/kernel/git/davem/net	2018-08-11 17:52:00 -07:00
Build	tools/bpf: move bpf/lib netlink related functions into a new file	2018-09-06 22:34:08 -07:00
libbpf_errno.c	tools/bpf: add more netlink functionalities in lib/bpf	2018-09-06 22:34:08 -07:00
libbpf.c	libbpf: Remove the duplicate checking of function storage	2018-09-05 22:16:00 -07:00
libbpf.h	tools/bpf: add more netlink functionalities in lib/bpf	2018-09-06 22:34:08 -07:00
Makefile	tools: libbpf: remove libelf-getphdrnum feature detection	2018-07-16 16:36:49 -07:00
netlink.c	tools/bpf: fix a netlink recv issue	2018-09-11 14:26:30 -07:00
nlattr.c	tools/bpf: add more netlink functionalities in lib/bpf	2018-09-06 22:34:08 -07:00
nlattr.h	tools/bpf: add more netlink functionalities in lib/bpf	2018-09-06 22:34:08 -07:00