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bpf: export bpf_sock for BPF_PROG_TYPE_SOCK_OPS prog type 

And let it use bpf_sk_storage_{get,delete} helpers to access socket
storage. Kernel context (struct bpf_sock_ops_kern) already has sk
member, so I just expose it to the BPF hooks. I use
PTR_TO_SOCKET_OR_NULL and return NULL in !is_fullsock case.

I also export bpf_tcp_sock to make it possible to access tcp socket stats.

Cc: Martin Lau <kafai@fb.com>
Signed-off-by: Stanislav Fomichev <sdf@google.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
Stanislav Fomichev 2019-06-12 10:30:38 -07:00 committed by Daniel Borkmann
parent fb85c4a730
commit 1314ef5611
2 changed files with 27 additions and 0 deletions
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1
include/uapi/linux/bpf.h
View File

@ -3299,6 +3299,7 @@ struct bpf_sock_ops {
__u32 sk_txhash;
__u64 bytes_received;
__u64 bytes_acked;
__bpf_md_ptr(struct bpf_sock *, sk);
};
/* Definitions for bpf_sock_ops_cb_flags */

26
net/core/filter.c
View File

@ -6147,6 +6147,14 @@ sock_ops_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
return &bpf_get_local_storage_proto;
case BPF_FUNC_perf_event_output:
return &bpf_sockopt_event_output_proto;
case BPF_FUNC_sk_storage_get:
return &bpf_sk_storage_get_proto;
case BPF_FUNC_sk_storage_delete:
return &bpf_sk_storage_delete_proto;
#ifdef CONFIG_INET
case BPF_FUNC_tcp_sock:
return &bpf_tcp_sock_proto;
#endif /* CONFIG_INET */
default:
return bpf_base_func_proto(func_id);
}
@ -6882,6 +6890,11 @@ static bool sock_ops_is_valid_access(int off, int size,
if (size != sizeof(__u64))
return false;
break;
case offsetof(struct bpf_sock_ops, sk):
if (size != sizeof(__u64))
return false;
info->reg_type = PTR_TO_SOCKET_OR_NULL;
break;
default:
if (size != size_default)
return false;
@ -8053,6 +8066,19 @@ static u32 sock_ops_convert_ctx_access(enum bpf_access_type type,
SOCK_OPS_GET_OR_SET_FIELD(sk_txhash, sk_txhash,
struct sock, type);
break;
case offsetof(struct bpf_sock_ops, sk):
*insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
struct bpf_sock_ops_kern,
is_fullsock),
si->dst_reg, si->src_reg,
offsetof(struct bpf_sock_ops_kern,
is_fullsock));
*insn++ = BPF_JMP_IMM(BPF_JEQ, si->dst_reg, 0, 1);
*insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
struct bpf_sock_ops_kern, sk),
si->dst_reg, si->src_reg,
offsetof(struct bpf_sock_ops_kern, sk));
break;
}
return insn - insn_buf;
}