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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 | // SPDX-License-Identifier: GPL-2.0 /* Copyright (c) 2021 Facebook */ #include <vmlinux.h> #include <bpf/bpf_helpers.h> extern int bpf_kfunc_call_test2(struct sock *sk, __u32 a, __u32 b) __ksym; extern __u64 bpf_kfunc_call_test1(struct sock *sk, __u32 a, __u64 b, __u32 c, __u64 d) __ksym; extern struct prog_test_ref_kfunc *bpf_kfunc_call_test_acquire(unsigned long *sp) __ksym; extern void bpf_kfunc_call_test_release(struct prog_test_ref_kfunc *p) __ksym; extern void bpf_kfunc_call_test_pass_ctx(struct __sk_buff *skb) __ksym; extern void bpf_kfunc_call_test_pass1(struct prog_test_pass1 *p) __ksym; extern void bpf_kfunc_call_test_pass2(struct prog_test_pass2 *p) __ksym; extern void bpf_kfunc_call_test_mem_len_pass1(void *mem, int len) __ksym; extern void bpf_kfunc_call_test_mem_len_fail2(__u64 *mem, int len) __ksym; extern int *bpf_kfunc_call_test_get_rdwr_mem(struct prog_test_ref_kfunc *p, const int rdwr_buf_size) __ksym; extern int *bpf_kfunc_call_test_get_rdonly_mem(struct prog_test_ref_kfunc *p, const int rdonly_buf_size) __ksym; SEC("tc") int kfunc_call_test2(struct __sk_buff *skb) { struct bpf_sock *sk = skb->sk; if (!sk) return -1; sk = bpf_sk_fullsock(sk); if (!sk) return -1; return bpf_kfunc_call_test2((struct sock *)sk, 1, 2); } SEC("tc") int kfunc_call_test1(struct __sk_buff *skb) { struct bpf_sock *sk = skb->sk; __u64 a = 1ULL << 32; __u32 ret; if (!sk) return -1; sk = bpf_sk_fullsock(sk); if (!sk) return -1; a = bpf_kfunc_call_test1((struct sock *)sk, 1, a | 2, 3, a | 4); ret = a >> 32; /* ret should be 2 */ ret += (__u32)a; /* ret should be 12 */ return ret; } SEC("tc") int kfunc_call_test_ref_btf_id(struct __sk_buff *skb) { struct prog_test_ref_kfunc *pt; unsigned long s = 0; int ret = 0; pt = bpf_kfunc_call_test_acquire(&s); if (pt) { if (pt->a != 42 || pt->b != 108) ret = -1; bpf_kfunc_call_test_release(pt); } return ret; } SEC("tc") int kfunc_call_test_pass(struct __sk_buff *skb) { struct prog_test_pass1 p1 = {}; struct prog_test_pass2 p2 = {}; short a = 0; __u64 b = 0; long c = 0; char d = 0; int e = 0; bpf_kfunc_call_test_pass_ctx(skb); bpf_kfunc_call_test_pass1(&p1); bpf_kfunc_call_test_pass2(&p2); bpf_kfunc_call_test_mem_len_pass1(&a, sizeof(a)); bpf_kfunc_call_test_mem_len_pass1(&b, sizeof(b)); bpf_kfunc_call_test_mem_len_pass1(&c, sizeof(c)); bpf_kfunc_call_test_mem_len_pass1(&d, sizeof(d)); bpf_kfunc_call_test_mem_len_pass1(&e, sizeof(e)); bpf_kfunc_call_test_mem_len_fail2(&b, -1); return 0; } struct syscall_test_args { __u8 data[16]; size_t size; }; SEC("syscall") int kfunc_syscall_test(struct syscall_test_args *args) { const long size = args->size; if (size > sizeof(args->data)) return -7; /* -E2BIG */ bpf_kfunc_call_test_mem_len_pass1(&args->data, sizeof(args->data)); bpf_kfunc_call_test_mem_len_pass1(&args->data, sizeof(*args)); bpf_kfunc_call_test_mem_len_pass1(&args->data, size); return 0; } SEC("syscall") int kfunc_syscall_test_null(struct syscall_test_args *args) { /* Must be called with args as a NULL pointer * we do not check for it to have the verifier consider that * the pointer might not be null, and so we can load it. * * So the following can not be added: * * if (args) * return -22; */ bpf_kfunc_call_test_mem_len_pass1(args, 0); return 0; } SEC("tc") int kfunc_call_test_get_mem(struct __sk_buff *skb) { struct prog_test_ref_kfunc *pt; unsigned long s = 0; int *p = NULL; int ret = 0; pt = bpf_kfunc_call_test_acquire(&s); if (pt) { p = bpf_kfunc_call_test_get_rdwr_mem(pt, 2 * sizeof(int)); if (p) { p[0] = 42; ret = p[1]; /* 108 */ } else { ret = -1; } if (ret >= 0) { p = bpf_kfunc_call_test_get_rdonly_mem(pt, 2 * sizeof(int)); if (p) ret = p[0]; /* 42 */ else ret = -1; } bpf_kfunc_call_test_release(pt); } return ret; } char _license[] SEC("license") = "GPL"; |