Function report |
Source Code:kernel\bpf\hashtab.c |
Create Date:2022-07-28 13:09:16 |
Last Modify:2022-05-23 09:15:29 | Copyright©Brick |
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Annotation kernel can get tool activity | Download SCCT | Chinese |
Name:Called from syscall
Proto:static int htab_map_alloc_check(union bpf_attr *attr)
Type:int
Parameter:
Type | Parameter | Name |
---|---|---|
union bpf_attr * | attr |
228 | percpu = one of enum bpf_map_type == BPF_MAP_TYPE_PERCPU_HASH || one of enum bpf_map_type == BPF_MAP_TYPE_LRU_PERCPU_HASH |
230 | lru = one of enum bpf_map_type == BPF_MAP_TYPE_LRU_HASH || one of enum bpf_map_type == BPF_MAP_TYPE_LRU_PERCPU_HASH |
238 | prealloc = Not ( BPF_MAP_CREATE related * flags defined above. & lags for BPF_MAP_CREATE command ) |
239 | zero_seed = BPF_MAP_CREATE related * flags defined above. & Zero-initialize hash function seed. This should only be used for testing. |
240 | numa_node = bpf_map_attr_numa_node(attr) |
242 | BUILD_BUG_ON - break compile if a condition is true(offsetof(structhtab_elem, htab) != offsetof(structhtab_elem, pprev)) |
244 | BUILD_BUG_ON - break compile if a condition is true(offsetof(structhtab_elem, next) != offsetof(structhtab_elem, pprev)) |
247 | If lru && Not Check operation authority Then Return -EPERM |
253 | If zero_seed && Not Check operation authority Then Return -EPERM |
257 | If BPF_MAP_CREATE related * flags defined above. & ~HTAB_CREATE_FLAG_MASK || Not bpf_map_flags_access_ok( BPF_MAP_CREATE related * flags defined above.) Then Return -EINVAL |
261 | If Not lru && percpu_lru Then Return -EINVAL |
264 | If lru && Not prealloc Then Return -Operation is not supported |
267 | If numa_node != NUMA_NO_NODE && (percpu || percpu_lru) Then Return -EINVAL |
273 | If max number of entries in a map == 0 || size of key in bytes == 0 || size of value in bytes == 0 Then Return -EINVAL |
277 | If size of key in bytes > BPF program can access up to 512 bytes of stack space. Then Return -E2BIG |
283 | If size of value in bytes >= Maximum allocatable size - BPF program can access up to 512 bytes of stack space. - sizeof(structhtab_elem) Then Return -E2BIG |
292 | Return 0 |
Name | Describe |
---|---|
fd_htab_map_alloc_check |
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