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I'd like to perform actions after a value is inserted to the specific map, using fentry/htab_map_update_elem hook. How can I check if struct bpf_map* map is the map that declared in BPF code?
fentry/htab_map_update_elem
struct bpf_map* map
For example,
// kernel BPF program

struct {
__uint(type, BPF_MAP_TYPE_HASH);
__uint(max_entries, 128);
__type(key, __u32);
__type(value, __u32);
} mymap SEC(".maps");

SEC("fentry/htab_map_update_elem")
int mymap_prog(struct bpf_map* map, void* key, void* value, u64 map_flags) {
// Here, how to check if map == mymap?
}

// kernel BPF program

struct {
__uint(type, BPF_MAP_TYPE_HASH);
__uint(max_entries, 128);
__type(key, __u32);
__type(value, __u32);
} mymap SEC(".maps");

SEC("fentry/htab_map_update_elem")
int mymap_prog(struct bpf_map* map, void* key, void* value, u64 map_flags) {
// Here, how to check if map == mymap?
}

// user program
int main() {
struct mymap_bpf* skel;
skel = ...

// Update mymap and trigger map update hook
bpf_map__update_elem(skel- maps.mymap, ...);

// user program
int main() {
struct mymap_bpf* skel;
skel = ...

// Update mymap and trigger map update hook
bpf_map__update_elem(skel- maps.mymap, ...);

(Skeleton header file is generated with bpftool)
Thank you in advance.


Tags: ebpf,bpf,libbpfSource of the question:
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