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f31645d138
With a bit larger, branchy eBPF programs f.e. already ~BPF_MAXINSNS/7 in size, it happens rather quickly that bpf(2) rejects also valid programs when only the verifier log buffer size we have in tc is too small. Change that, so by default we don't do any logging, and only in error case we retry with logging enabled. If we should fail providing a reasonable dump of the verifier analysis, retry few times with a larger log buffer so that we can at least give the user a chance to debug the program. Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: John Fastabend <john.r.fastabend@intel.com>
79 lines
1.8 KiB
C
79 lines
1.8 KiB
C
/*
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* tc_bpf.h BPF common code
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*
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* This program is free software; you can distribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* Authors: Daniel Borkmann <dborkman@redhat.com>
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* Jiri Pirko <jiri@resnulli.us>
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*/
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#ifndef _TC_BPF_H_
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#define _TC_BPF_H_ 1
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#include <linux/netlink.h>
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#include <linux/bpf.h>
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#include <linux/magic.h>
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#include "utils.h"
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#include "bpf_scm.h"
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enum {
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BPF_NLA_OPS_LEN = 0,
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BPF_NLA_OPS,
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BPF_NLA_FD,
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BPF_NLA_NAME,
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__BPF_NLA_MAX,
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};
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#define BPF_NLA_MAX __BPF_NLA_MAX
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#define BPF_ENV_UDS "TC_BPF_UDS"
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#define BPF_ENV_MNT "TC_BPF_MNT"
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#ifndef BPF_FS_MAGIC
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# define BPF_FS_MAGIC 0xcafe4a11
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#endif
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#define BPF_DIR_MNT "/sys/fs/bpf"
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#define BPF_DIR_TC "tc"
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#define BPF_DIR_GLOBALS "globals"
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#ifndef TRACEFS_MAGIC
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# define TRACEFS_MAGIC 0x74726163
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#endif
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#define TRACE_DIR_MNT "/sys/kernel/tracing"
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int bpf_trace_pipe(void);
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const char *bpf_default_section(const enum bpf_prog_type type);
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int bpf_parse_common(int *ptr_argc, char ***ptr_argv, const int *nla_tbl,
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enum bpf_prog_type type, const char **ptr_object,
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const char **ptr_uds_name, struct nlmsghdr *n);
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int bpf_graft_map(const char *map_path, uint32_t *key, int argc, char **argv);
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void bpf_print_ops(FILE *f, struct rtattr *bpf_ops, __u16 len);
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#ifdef HAVE_ELF
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int bpf_send_map_fds(const char *path, const char *obj);
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int bpf_recv_map_fds(const char *path, int *fds, struct bpf_map_aux *aux,
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unsigned int entries);
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#else
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static inline int bpf_send_map_fds(const char *path, const char *obj)
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{
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return 0;
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}
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static inline int bpf_recv_map_fds(const char *path, int *fds,
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struct bpf_map_aux *aux,
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unsigned int entries)
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{
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return -1;
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}
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#endif /* HAVE_ELF */
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#endif /* _TC_BPF_H_ */
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