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Date: Thu, 13 Dec 2018 11:03:01 -0800
From: Stanislav Fomichev <sdf@...gle.com>
To: netdev@...r.kernel.org, ast@...nel.org
Cc: davem@...emloft.net, daniel@...earbox.net, ecree@...arflare.com,
quentin.monnet@...ronome.com, Stanislav Fomichev <sdf@...gle.com>
Subject: [PATCH bpf-next 6/6] bpf: BPF_PROG_TYPE_CGROUP_{SKB,SOCK,SOCK_ADDR}
require cgroups enabled
There is no way to exercise appropriate attach points without cgroups
enabled. This lets test_verifier correctly skip tests for these
prog_types if kernel was compiled without BPF cgroup support.
Signed-off-by: Stanislav Fomichev <sdf@...gle.com>
---
include/linux/bpf_types.h | 2 ++
net/core/filter.c | 18 ++++++++++++++++++
2 files changed, 20 insertions(+)
diff --git a/include/linux/bpf_types.h b/include/linux/bpf_types.h
index 44d9ab4809bd..08bf2f1fe553 100644
--- a/include/linux/bpf_types.h
+++ b/include/linux/bpf_types.h
@@ -6,9 +6,11 @@ BPF_PROG_TYPE(BPF_PROG_TYPE_SOCKET_FILTER, sk_filter)
BPF_PROG_TYPE(BPF_PROG_TYPE_SCHED_CLS, tc_cls_act)
BPF_PROG_TYPE(BPF_PROG_TYPE_SCHED_ACT, tc_cls_act)
BPF_PROG_TYPE(BPF_PROG_TYPE_XDP, xdp)
+#ifdef CONFIG_CGROUP_BPF
BPF_PROG_TYPE(BPF_PROG_TYPE_CGROUP_SKB, cg_skb)
BPF_PROG_TYPE(BPF_PROG_TYPE_CGROUP_SOCK, cg_sock)
BPF_PROG_TYPE(BPF_PROG_TYPE_CGROUP_SOCK_ADDR, cg_sock_addr)
+#endif
BPF_PROG_TYPE(BPF_PROG_TYPE_LWT_IN, lwt_in)
BPF_PROG_TYPE(BPF_PROG_TYPE_LWT_OUT, lwt_out)
BPF_PROG_TYPE(BPF_PROG_TYPE_LWT_XMIT, lwt_xmit)
diff --git a/net/core/filter.c b/net/core/filter.c
index f9348806e843..6a390e519431 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -5315,6 +5315,7 @@ bpf_base_func_proto(enum bpf_func_id func_id)
}
}
+#ifdef CONFIG_CGROUP_BPF
static const struct bpf_func_proto *
sock_filter_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
{
@@ -5364,6 +5365,7 @@ sock_addr_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
return bpf_base_func_proto(func_id);
}
}
+#endif
static const struct bpf_func_proto *
sk_filter_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
@@ -5382,6 +5384,7 @@ sk_filter_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
}
}
+#ifdef CONFIG_CGROUP_BPF
static const struct bpf_func_proto *
cg_skb_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
{
@@ -5392,6 +5395,7 @@ cg_skb_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
return sk_filter_func_proto(func_id, prog);
}
}
+#endif
static const struct bpf_func_proto *
tc_cls_act_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
@@ -5790,6 +5794,7 @@ static bool sk_filter_is_valid_access(int off, int size,
return bpf_skb_is_valid_access(off, size, type, prog, info);
}
+#ifdef CONFIG_CGROUP_BPF
static bool cg_skb_is_valid_access(int off, int size,
enum bpf_access_type type,
const struct bpf_prog *prog,
@@ -5834,6 +5839,7 @@ static bool cg_skb_is_valid_access(int off, int size,
return bpf_skb_is_valid_access(off, size, type, prog, info);
}
+#endif
static bool lwt_is_valid_access(int off, int size,
enum bpf_access_type type,
@@ -5873,6 +5879,7 @@ static bool lwt_is_valid_access(int off, int size,
return bpf_skb_is_valid_access(off, size, type, prog, info);
}
+#ifdef CONFIG_CGROUP_BPF
/* Attach type specific accesses */
static bool __sock_filter_check_attach_type(int off,
enum bpf_access_type access_type,
@@ -5916,6 +5923,7 @@ static bool __sock_filter_check_attach_type(int off,
full_access:
return true;
}
+#endif
static bool __sock_filter_check_size(int off, int size,
struct bpf_insn_access_aux *info)
@@ -5944,6 +5952,7 @@ bool bpf_sock_is_valid_access(int off, int size, enum bpf_access_type type,
return true;
}
+#ifdef CONFIG_CGROUP_BPF
static bool sock_filter_is_valid_access(int off, int size,
enum bpf_access_type type,
const struct bpf_prog *prog,
@@ -5954,6 +5963,7 @@ static bool sock_filter_is_valid_access(int off, int size,
return __sock_filter_check_attach_type(off, type,
prog->expected_attach_type);
}
+#endif
static int bpf_noop_prologue(struct bpf_insn *insn_buf, bool direct_write,
const struct bpf_prog *prog)
@@ -6133,6 +6143,7 @@ void bpf_warn_invalid_xdp_action(u32 act)
}
EXPORT_SYMBOL_GPL(bpf_warn_invalid_xdp_action);
+#ifdef CONFIG_CGROUP_BPF
static bool sock_addr_is_valid_access(int off, int size,
enum bpf_access_type type,
const struct bpf_prog *prog,
@@ -6219,6 +6230,7 @@ static bool sock_addr_is_valid_access(int off, int size,
return true;
}
+#endif
static bool sock_ops_is_valid_access(int off, int size,
enum bpf_access_type type,
@@ -6955,6 +6967,7 @@ static u32 xdp_convert_ctx_access(enum bpf_access_type type,
SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF( \
S, NS, F, NF, BPF_FIELD_SIZEOF(NS, NF), 0, TF)
+#ifdef CONFIG_CGROUP_BPF
static u32 sock_addr_convert_ctx_access(enum bpf_access_type type,
const struct bpf_insn *si,
struct bpf_insn *insn_buf,
@@ -7043,6 +7056,7 @@ static u32 sock_addr_convert_ctx_access(enum bpf_access_type type,
return insn - insn_buf;
}
+#endif
static u32 sock_ops_convert_ctx_access(enum bpf_access_type type,
const struct bpf_insn *si,
@@ -7569,6 +7583,7 @@ const struct bpf_prog_ops xdp_prog_ops = {
.test_run = bpf_prog_test_run_xdp,
};
+#ifdef CONFIG_CGROUP_BPF
const struct bpf_verifier_ops cg_skb_verifier_ops = {
.get_func_proto = cg_skb_func_proto,
.is_valid_access = cg_skb_is_valid_access,
@@ -7578,6 +7593,7 @@ const struct bpf_verifier_ops cg_skb_verifier_ops = {
const struct bpf_prog_ops cg_skb_prog_ops = {
.test_run = bpf_prog_test_run_skb,
};
+#endif
const struct bpf_verifier_ops lwt_in_verifier_ops = {
.get_func_proto = lwt_in_func_proto,
@@ -7620,6 +7636,7 @@ const struct bpf_prog_ops lwt_seg6local_prog_ops = {
.test_run = bpf_prog_test_run_skb,
};
+#ifdef CONFIG_CGROUP_BPF
const struct bpf_verifier_ops cg_sock_verifier_ops = {
.get_func_proto = sock_filter_func_proto,
.is_valid_access = sock_filter_is_valid_access,
@@ -7637,6 +7654,7 @@ const struct bpf_verifier_ops cg_sock_addr_verifier_ops = {
const struct bpf_prog_ops cg_sock_addr_prog_ops = {
};
+#endif
const struct bpf_verifier_ops sock_ops_verifier_ops = {
.get_func_proto = sock_ops_func_proto,
--
2.20.0.rc2.403.gdbc3b29805-goog
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