624cd2a176
Convert exceptions_assert.c to bpf_cmp_unlikely() macro. Since bpf_assert(bpf_cmp_unlikely(var, ==, 100)); other code; will generate assembly code: if r1 == 100 goto L2; r0 = 0 call bpf_throw L1: other code; ... L2: goto L1; LLVM generates redundant basic block with extra goto. LLVM will be fixed eventually. Right now it's less efficient than __bpf_assert(var, ==, 100) macro that produces: if r1 == 100 goto L1; r0 = 0 call bpf_throw L1: other code; But extra goto doesn't hurt the verification process. Signed-off-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Acked-by: Jiri Olsa <jolsa@kernel.org> Acked-by: Kumar Kartikeya Dwivedi <memxor@gmail.com> Link: https://lore.kernel.org/bpf/20231226191148.48536-4-alexei.starovoitov@gmail.com
135 lines
4 KiB
C
135 lines
4 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <vmlinux.h>
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#include <limits.h>
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#include <bpf/bpf_tracing.h>
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#include <bpf/bpf_helpers.h>
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#include <bpf/bpf_core_read.h>
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#include <bpf/bpf_endian.h>
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#include "bpf_misc.h"
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#include "bpf_experimental.h"
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#define check_assert(type, op, name, value) \
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SEC("?tc") \
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__log_level(2) __failure \
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int check_assert_##name(void *ctx) \
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{ \
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type num = bpf_ktime_get_ns(); \
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bpf_assert(bpf_cmp_unlikely(num, op, value)); \
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return *(u64 *)num; \
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}
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__msg(": R0_w=0xffffffff80000000")
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check_assert(s64, ==, eq_int_min, INT_MIN);
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__msg(": R0_w=0x7fffffff")
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check_assert(s64, ==, eq_int_max, INT_MAX);
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__msg(": R0_w=0")
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check_assert(s64, ==, eq_zero, 0);
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__msg(": R0_w=0x8000000000000000 R1_w=0x8000000000000000")
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check_assert(s64, ==, eq_llong_min, LLONG_MIN);
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__msg(": R0_w=0x7fffffffffffffff R1_w=0x7fffffffffffffff")
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check_assert(s64, ==, eq_llong_max, LLONG_MAX);
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__msg(": R0_w=scalar(id=1,smax=0x7ffffffe)")
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check_assert(s64, <, lt_pos, INT_MAX);
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__msg(": R0_w=scalar(id=1,smax=-1,umin=0x8000000000000000,var_off=(0x8000000000000000; 0x7fffffffffffffff))")
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check_assert(s64, <, lt_zero, 0);
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__msg(": R0_w=scalar(id=1,smax=0xffffffff7fffffff")
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check_assert(s64, <, lt_neg, INT_MIN);
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__msg(": R0_w=scalar(id=1,smax=0x7fffffff)")
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check_assert(s64, <=, le_pos, INT_MAX);
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__msg(": R0_w=scalar(id=1,smax=0)")
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check_assert(s64, <=, le_zero, 0);
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__msg(": R0_w=scalar(id=1,smax=0xffffffff80000000")
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check_assert(s64, <=, le_neg, INT_MIN);
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__msg(": R0_w=scalar(id=1,smin=umin=0x80000000,umax=0x7fffffffffffffff,var_off=(0x0; 0x7fffffffffffffff))")
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check_assert(s64, >, gt_pos, INT_MAX);
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__msg(": R0_w=scalar(id=1,smin=umin=1,umax=0x7fffffffffffffff,var_off=(0x0; 0x7fffffffffffffff))")
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check_assert(s64, >, gt_zero, 0);
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__msg(": R0_w=scalar(id=1,smin=0xffffffff80000001")
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check_assert(s64, >, gt_neg, INT_MIN);
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__msg(": R0_w=scalar(id=1,smin=umin=0x7fffffff,umax=0x7fffffffffffffff,var_off=(0x0; 0x7fffffffffffffff))")
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check_assert(s64, >=, ge_pos, INT_MAX);
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__msg(": R0_w=scalar(id=1,smin=0,umax=0x7fffffffffffffff,var_off=(0x0; 0x7fffffffffffffff))")
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check_assert(s64, >=, ge_zero, 0);
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__msg(": R0_w=scalar(id=1,smin=0xffffffff80000000")
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check_assert(s64, >=, ge_neg, INT_MIN);
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SEC("?tc")
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__log_level(2) __failure
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__msg(": R0=0 R1=ctx() R2=scalar(smin=0xffffffff80000002,smax=smax32=0x7ffffffd,smin32=0x80000002) R10=fp0")
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int check_assert_range_s64(struct __sk_buff *ctx)
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{
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struct bpf_sock *sk = ctx->sk;
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s64 num;
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_Static_assert(_Generic((sk->rx_queue_mapping), s32: 1, default: 0), "type match");
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if (!sk)
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return 0;
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num = sk->rx_queue_mapping;
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bpf_assert_range(num, INT_MIN + 2, INT_MAX - 2);
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return *((u8 *)ctx + num);
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}
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SEC("?tc")
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__log_level(2) __failure
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__msg(": R1=ctx() R2=scalar(smin=umin=smin32=umin32=4096,smax=umax=smax32=umax32=8192,var_off=(0x0; 0x3fff))")
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int check_assert_range_u64(struct __sk_buff *ctx)
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{
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u64 num = ctx->len;
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bpf_assert_range(num, 4096, 8192);
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return *((u8 *)ctx + num);
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}
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SEC("?tc")
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__log_level(2) __failure
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__msg(": R0=0 R1=ctx() R2=4096 R10=fp0")
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int check_assert_single_range_s64(struct __sk_buff *ctx)
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{
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struct bpf_sock *sk = ctx->sk;
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s64 num;
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_Static_assert(_Generic((sk->rx_queue_mapping), s32: 1, default: 0), "type match");
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if (!sk)
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return 0;
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num = sk->rx_queue_mapping;
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bpf_assert_range(num, 4096, 4096);
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return *((u8 *)ctx + num);
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}
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SEC("?tc")
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__log_level(2) __failure
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__msg(": R1=ctx() R2=4096 R10=fp0")
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int check_assert_single_range_u64(struct __sk_buff *ctx)
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{
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u64 num = ctx->len;
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bpf_assert_range(num, 4096, 4096);
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return *((u8 *)ctx + num);
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}
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SEC("?tc")
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__log_level(2) __failure
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__msg(": R1=pkt(off=64,r=64) R2=pkt_end() R6=pkt(r=64) R10=fp0")
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int check_assert_generic(struct __sk_buff *ctx)
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{
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u8 *data_end = (void *)(long)ctx->data_end;
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u8 *data = (void *)(long)ctx->data;
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bpf_assert(data + 64 <= data_end);
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return data[128];
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}
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SEC("?fentry/bpf_check")
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__failure __msg("At program exit the register R1 has smin=64 smax=64")
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int check_assert_with_return(void *ctx)
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{
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bpf_assert_with(!ctx, 64);
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return 0;
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}
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char _license[] SEC("license") = "GPL";
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