1 // SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)
12 #include "bpf-utils.h"
18 	int	size_offset;	/* > 0: offset of rec size,
19 				 * < 0: fix size of -size_offset
27 		-1,
32 		-1,
37 		-(int)sizeof(__u32),
42 		-(int)sizeof(__u64),
47 		-(int)sizeof(__u32),
67 		-(int)sizeof(__u8) * BPF_TAG_SIZE,
79 	return -(int)offset;  in bpf_prog_info_read_offset_u32()
89 	return -(int)offset;  in bpf_prog_info_read_offset_u64()
121 		return ERR_PTR(-EINVAL);  in get_bpf_prog_info_linear()
123 	/* step 1: get array dimensions */  in get_bpf_prog_info_linear()
127 		return ERR_PTR(-EFAULT);  in get_bpf_prog_info_linear()
130 	/* step 2: calculate total size of all arrays */  in get_bpf_prog_info_linear()
134 		__u32 count, size;  in get_bpf_prog_info_linear()  local
139 		if (info_len < desc->array_offset + sizeof(__u32) ||  in get_bpf_prog_info_linear()
140 		    info_len < desc->count_offset + sizeof(__u32) ||  in get_bpf_prog_info_linear()
141 		    (desc->size_offset > 0 && info_len < (__u32)desc->size_offset))  in get_bpf_prog_info_linear()
149 		count = bpf_prog_info_read_offset_u32(&info, desc->count_offset);  in get_bpf_prog_info_linear()
150 		size  = bpf_prog_info_read_offset_u32(&info, desc->size_offset);  in get_bpf_prog_info_linear()
152 		data_len += roundup(count * size, sizeof(__u64));  in get_bpf_prog_info_linear()
155 	/* step 3: allocate continuous memory */  in get_bpf_prog_info_linear()
158 		return ERR_PTR(-ENOMEM);  in get_bpf_prog_info_linear()
160 	/* step 4: fill data to info_linear->info */  in get_bpf_prog_info_linear()
161 	info_linear->arrays = arrays;  in get_bpf_prog_info_linear()
162 	memset(&info_linear->info, 0, sizeof(info));  in get_bpf_prog_info_linear()
163 	ptr = info_linear->data;  in get_bpf_prog_info_linear()
167 		__u32 count, size;  in get_bpf_prog_info_linear()  local
173 		count = bpf_prog_info_read_offset_u32(&info, desc->count_offset);  in get_bpf_prog_info_linear()
174 		size  = bpf_prog_info_read_offset_u32(&info, desc->size_offset);  in get_bpf_prog_info_linear()
175 		bpf_prog_info_set_offset_u32(&info_linear->info,  in get_bpf_prog_info_linear()
176 					     desc->count_offset, count);  in get_bpf_prog_info_linear()
177 		bpf_prog_info_set_offset_u32(&info_linear->info,  in get_bpf_prog_info_linear()
178 					     desc->size_offset, size);  in get_bpf_prog_info_linear()
179 		bpf_prog_info_set_offset_u64(&info_linear->info,  in get_bpf_prog_info_linear()
180 					     desc->array_offset,  in get_bpf_prog_info_linear()
182 		ptr += roundup(count * size, sizeof(__u64));  in get_bpf_prog_info_linear()
185 	/* step 5: call syscall again to get required arrays */  in get_bpf_prog_info_linear()
186 	err = bpf_obj_get_info_by_fd(fd, &info_linear->info, &info_len);  in get_bpf_prog_info_linear()
190 		return ERR_PTR(-EFAULT);  in get_bpf_prog_info_linear()
193 	/* step 6: verify the data */  in get_bpf_prog_info_linear()
202 		v1 = bpf_prog_info_read_offset_u32(&info, desc->count_offset);  in get_bpf_prog_info_linear()
203 		v2 = bpf_prog_info_read_offset_u32(&info_linear->info,  in get_bpf_prog_info_linear()
204 						   desc->count_offset);  in get_bpf_prog_info_linear()
208 		v1 = bpf_prog_info_read_offset_u32(&info, desc->size_offset);  in get_bpf_prog_info_linear()
209 		v2 = bpf_prog_info_read_offset_u32(&info_linear->info,  in get_bpf_prog_info_linear()
210 						   desc->size_offset);  in get_bpf_prog_info_linear()
212 			pr_warning("%s: mismatch in rec size\n", __func__);  in get_bpf_prog_info_linear()
215 	/* step 7: update info_len and data_len */  in get_bpf_prog_info_linear()
216 	info_linear->info_len = sizeof(struct bpf_prog_info);  in get_bpf_prog_info_linear()
217 	info_linear->data_len = data_len;  in get_bpf_prog_info_linear()
230 		if ((info_linear->arrays & (1UL << i)) == 0)  in bpil_addr_to_offs()
234 		addr = bpf_prog_info_read_offset_u64(&info_linear->info,  in bpil_addr_to_offs()
235 						     desc->array_offset);  in bpil_addr_to_offs()
236 		offs = addr - ptr_to_u64(info_linear->data);  in bpil_addr_to_offs()
237 		bpf_prog_info_set_offset_u64(&info_linear->info,  in bpil_addr_to_offs()
238 					     desc->array_offset, offs);  in bpil_addr_to_offs()
250 		if ((info_linear->arrays & (1UL << i)) == 0)  in bpil_offs_to_addr()
254 		offs = bpf_prog_info_read_offset_u64(&info_linear->info,  in bpil_offs_to_addr()
255 						     desc->array_offset);  in bpil_offs_to_addr()
256 		addr = offs + ptr_to_u64(info_linear->data);  in bpil_offs_to_addr()
257 		bpf_prog_info_set_offset_u64(&info_linear->info,  in bpil_offs_to_addr()
258 					     desc->array_offset, addr);  in bpil_offs_to_addr()