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8498ca92d7
The size of bpf_insn is passed to bpf_load_program instead of the number of elements as it expects, so ip vrf exec fails with: $ sudo ip link add vrf-blue type vrf table 10 $ sudo ip link set dev vrf-blue up $ sudo ip/ip vrf exec vrf-blue ls Failed to load BPF prog: 'Invalid argument' last insn is not an exit or jmp processed 0 insns (limit 1000000) max_states_per_insn 0 total_states 0 peak_states 0 mark_read 0 Kernel compiled with CGROUP_BPF enabled? https://bugs.debian.org/980046 Reported-by: Emmanuel DECAEN <Emmanuel.Decaen@xsalto.com> Signed-off-by: Luca Boccassi <bluca@debian.org> Reviewed-by: David Ahern <dsahern@kernel.org> Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
88 lines
2.4 KiB
C
88 lines
2.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* bpf_glue.c: BPF code to call both legacy and libbpf code
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* Authors: Hangbin Liu <haliu@redhat.com>
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*
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*/
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#include "bpf_util.h"
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#ifdef HAVE_LIBBPF
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#include <bpf/bpf.h>
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#endif
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int bpf_program_load(enum bpf_prog_type type, const struct bpf_insn *insns,
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size_t size_insns, const char *license, char *log,
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size_t size_log)
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{
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#ifdef HAVE_LIBBPF
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return bpf_load_program(type, insns, size_insns / sizeof(struct bpf_insn),
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license, 0, log, size_log);
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#else
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return bpf_prog_load_dev(type, insns, size_insns, license, 0, log, size_log);
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#endif
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}
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int bpf_program_attach(int prog_fd, int target_fd, enum bpf_attach_type type)
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{
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#ifdef HAVE_LIBBPF
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return bpf_prog_attach(prog_fd, target_fd, type, 0);
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#else
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return bpf_prog_attach_fd(prog_fd, target_fd, type);
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#endif
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}
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#ifdef HAVE_LIBBPF
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static const char *_libbpf_compile_version = LIBBPF_VERSION;
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static char _libbpf_version[10] = {};
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const char *get_libbpf_version(void)
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{
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/* Start by copying compile-time version into buffer so we have a
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* fallback value in case we are dynamically linked, or can't find a
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* version in /proc/self/maps below.
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*/
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strncpy(_libbpf_version, _libbpf_compile_version,
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sizeof(_libbpf_version)-1);
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#ifdef LIBBPF_DYNAMIC
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char buf[PATH_MAX], *s;
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bool found = false;
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FILE *fp;
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/* When dynamically linking against libbpf, we can't be sure that the
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* version we discovered at compile time is actually the one we are
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* using at runtime. This can lead to hard-to-debug errors, so we try to
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* discover the correct version at runtime.
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*
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* The simple solution to this would be if libbpf itself exported a
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* version in its API. But since it doesn't, we work around this by
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* parsing the mappings of the binary at runtime, looking for the full
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* filename of libbpf.so and using that.
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*/
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fp = fopen("/proc/self/maps", "r");
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if (fp == NULL)
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goto out;
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while ((s = fgets(buf, sizeof(buf), fp)) != NULL) {
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if ((s = strstr(buf, "libbpf.so.")) != NULL) {
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strncpy(_libbpf_version, s+10, sizeof(_libbpf_version)-1);
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strtok(_libbpf_version, "\n");
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found = true;
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break;
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}
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}
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fclose(fp);
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out:
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if (!found)
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fprintf(stderr, "Couldn't find runtime libbpf version - falling back to compile-time value!\n");
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#endif /* LIBBPF_DYNAMIC */
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_libbpf_version[sizeof(_libbpf_version)-1] = '\0';
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return _libbpf_version;
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}
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#else
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const char *get_libbpf_version(void)
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{
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return NULL;
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}
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#endif /* HAVE_LIBBPF */
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