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https://github.com/edk2-porting/linux-next.git
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36f1678d9e
This patch added a few netlink attribute parsing functions
and the netlink API functions to query networking links, tc classes,
tc qdiscs and tc filters. For example, the following API is
to get networking links:
int nl_get_link(int sock, unsigned int nl_pid,
dump_nlmsg_t dump_link_nlmsg,
void *cookie);
Note that when the API is called, the user also provided a
callback function with the following signature:
int (*dump_nlmsg_t)(void *cookie, void *msg, struct nlattr **tb);
The "cookie" is the parameter the user passed to the API and will
be available for the callback function.
The "msg" is the information about the result, e.g., ifinfomsg or
tcmsg. The "tb" is the parsed netlink attributes.
Signed-off-by: Yonghong Song <yhs@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
76 lines
2.4 KiB
C
76 lines
2.4 KiB
C
// SPDX-License-Identifier: LGPL-2.1
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/*
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* Copyright (C) 2013-2015 Alexei Starovoitov <ast@kernel.org>
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* Copyright (C) 2015 Wang Nan <wangnan0@huawei.com>
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* Copyright (C) 2015 Huawei Inc.
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* Copyright (C) 2017 Nicira, Inc.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation;
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* version 2.1 of the License (not later!)
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this program; if not, see <http://www.gnu.org/licenses>
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*/
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#include <stdio.h>
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#include <string.h>
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#include "libbpf.h"
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#define ERRNO_OFFSET(e) ((e) - __LIBBPF_ERRNO__START)
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#define ERRCODE_OFFSET(c) ERRNO_OFFSET(LIBBPF_ERRNO__##c)
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#define NR_ERRNO (__LIBBPF_ERRNO__END - __LIBBPF_ERRNO__START)
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static const char *libbpf_strerror_table[NR_ERRNO] = {
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[ERRCODE_OFFSET(LIBELF)] = "Something wrong in libelf",
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[ERRCODE_OFFSET(FORMAT)] = "BPF object format invalid",
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[ERRCODE_OFFSET(KVERSION)] = "'version' section incorrect or lost",
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[ERRCODE_OFFSET(ENDIAN)] = "Endian mismatch",
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[ERRCODE_OFFSET(INTERNAL)] = "Internal error in libbpf",
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[ERRCODE_OFFSET(RELOC)] = "Relocation failed",
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[ERRCODE_OFFSET(VERIFY)] = "Kernel verifier blocks program loading",
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[ERRCODE_OFFSET(PROG2BIG)] = "Program too big",
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[ERRCODE_OFFSET(KVER)] = "Incorrect kernel version",
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[ERRCODE_OFFSET(PROGTYPE)] = "Kernel doesn't support this program type",
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[ERRCODE_OFFSET(WRNGPID)] = "Wrong pid in netlink message",
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[ERRCODE_OFFSET(INVSEQ)] = "Invalid netlink sequence",
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[ERRCODE_OFFSET(NLPARSE)] = "Incorrect netlink message parsing",
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};
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int libbpf_strerror(int err, char *buf, size_t size)
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{
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if (!buf || !size)
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return -1;
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err = err > 0 ? err : -err;
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if (err < __LIBBPF_ERRNO__START) {
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int ret;
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ret = strerror_r(err, buf, size);
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buf[size - 1] = '\0';
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return ret;
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}
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if (err < __LIBBPF_ERRNO__END) {
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const char *msg;
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msg = libbpf_strerror_table[ERRNO_OFFSET(err)];
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snprintf(buf, size, "%s", msg);
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buf[size - 1] = '\0';
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return 0;
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}
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snprintf(buf, size, "Unknown libbpf error %d", err);
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buf[size - 1] = '\0';
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return -1;
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}
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