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net: sock: allow eBPF programs to be attached to sockets

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introduce new setsockopt() command:

setsockopt(sock, SOL_SOCKET, SO_ATTACH_BPF, &prog_fd, sizeof(prog_fd))

where prog_fd was received from syscall bpf(BPF_PROG_LOAD, attr, ...)
and attr->prog_type == BPF_PROG_TYPE_SOCKET_FILTER

setsockopt() calls bpf_prog_get() which increments refcnt of the program,
so it doesn't get unloaded while socket is using the program.

The same eBPF program can be attached to multiple sockets.

User task exit automatically closes socket which calls sk_filter_uncharge()
which decrements refcnt of eBPF program

Signed-off-by: Alexei Starovoitov <ast@plumgrid.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Alexei Starovoitov 2014-12-01 15:06:35 -08:00 • committed by David S. Miller
parent ddd872bc30
commit 89aa075832
18 changed files with 155 additions and 2 deletions
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4
include/linux/bpf.h
View file

@ -128,7 +128,11 @@ struct bpf_prog_aux {
struct work_struct work;
};
#ifdef CONFIG_BPF_SYSCALL
void bpf_prog_put(struct bpf_prog *prog);
#else
static inline void bpf_prog_put(struct bpf_prog *prog) {}
#endif
struct bpf_prog *bpf_prog_get(u32 ufd);
/* verify correctness of eBPF program */
int bpf_check(struct bpf_prog *fp, union bpf_attr *attr);