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sock_map: Introduce BPF_SK_SKB_VERDICT

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Reusing BPF_SK_SKB_STREAM_VERDICT is possible but its name is
confusing and more importantly we still want to distinguish them
from user-space. So we can just reuse the stream verdict code but
introduce a new type of eBPF program, skb_verdict. Users are not
allowed to attach stream_verdict and skb_verdict programs to the
same map.

Signed-off-by: Cong Wang <cong.wang@bytedance.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: John Fastabend <john.fastabend@gmail.com>
Link: https://lore.kernel.org/bpf/20210331023237.41094-10-xiyou.wangcong@gmail.com
This commit is contained in:
Cong Wang 2021-03-30 19:32:30 -07:00 committed by Alexei Starovoitov
parent b017055255
commit a7ba4558e6
8 changed files with 38 additions and 1 deletions
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2
include/linux/skmsg.h
View File

@ -58,6 +58,7 @@ struct sk_psock_progs {
struct bpf_prog *msg_parser;
struct bpf_prog *stream_parser;
struct bpf_prog *stream_verdict;
struct bpf_prog *skb_verdict;
};
enum sk_psock_state_bits {
@ -487,6 +488,7 @@ static inline void psock_progs_drop(struct sk_psock_progs *progs)
psock_set_prog(&progs->msg_parser, NULL);
psock_set_prog(&progs->stream_parser, NULL);
psock_set_prog(&progs->stream_verdict, NULL);
psock_set_prog(&progs->skb_verdict, NULL);
}
int sk_psock_tls_strp_read(struct sk_psock *psock, struct sk_buff *skb);

1
include/uapi/linux/bpf.h
View File

@ -957,6 +957,7 @@ enum bpf_attach_type {
BPF_XDP_CPUMAP,
BPF_SK_LOOKUP,
BPF_XDP,
BPF_SK_SKB_VERDICT,
__MAX_BPF_ATTACH_TYPE
};

1
kernel/bpf/syscall.c
View File

@ -2948,6 +2948,7 @@ attach_type_to_prog_type(enum bpf_attach_type attach_type)
return BPF_PROG_TYPE_SK_MSG;
case BPF_SK_SKB_STREAM_PARSER:
case BPF_SK_SKB_STREAM_VERDICT:
case BPF_SK_SKB_VERDICT:
return BPF_PROG_TYPE_SK_SKB;
case BPF_LIRC_MODE2:
return BPF_PROG_TYPE_LIRC_MODE2;

4
net/core/skmsg.c
View File

@ -697,7 +697,7 @@ void sk_psock_drop(struct sock *sk, struct sk_psock *psock)
rcu_assign_sk_user_data(sk, NULL);
if (psock->progs.stream_parser)
sk_psock_stop_strp(sk, psock);
else if (psock->progs.stream_verdict)
else if (psock->progs.stream_verdict || psock->progs.skb_verdict)
sk_psock_stop_verdict(sk, psock);
write_unlock_bh(&sk->sk_callback_lock);
@ -1024,6 +1024,8 @@ static int sk_psock_verdict_recv(read_descriptor_t *desc, struct sk_buff *skb,
}
skb_set_owner_r(skb, sk);
prog = READ_ONCE(psock->progs.stream_verdict);
if (!prog)
prog = READ_ONCE(psock->progs.skb_verdict);
if (likely(prog)) {
skb_dst_drop(skb);
skb_bpf_redirect_clear(skb);

28
net/core/sock_map.c
View File

@ -156,6 +156,8 @@ static void sock_map_del_link(struct sock *sk,
strp_stop = true;
if (psock->saved_data_ready && stab->progs.stream_verdict)
verdict_stop = true;
if (psock->saved_data_ready && stab->progs.skb_verdict)
verdict_stop = true;
list_del(&link->list);
sk_psock_free_link(link);
}
@ -232,6 +234,7 @@ static int sock_map_link(struct bpf_map *map, struct sock *sk)
struct sk_psock_progs *progs = sock_map_progs(map);
struct bpf_prog *stream_verdict = NULL;
struct bpf_prog *stream_parser = NULL;
struct bpf_prog *skb_verdict = NULL;
struct bpf_prog *msg_parser = NULL;
struct sk_psock *psock;
int ret;
@ -268,6 +271,15 @@ static int sock_map_link(struct bpf_map *map, struct sock *sk)
}
}
skb_verdict = READ_ONCE(progs->skb_verdict);
if (skb_verdict) {
skb_verdict = bpf_prog_inc_not_zero(skb_verdict);
if (IS_ERR(skb_verdict)) {
ret = PTR_ERR(skb_verdict);
goto out_put_msg_parser;
}
}
no_progs:
psock = sock_map_psock_get_checked(sk);
if (IS_ERR(psock)) {
@ -278,6 +290,9 @@ no_progs:
if (psock) {
if ((msg_parser && READ_ONCE(psock->progs.msg_parser)) ||
(stream_parser && READ_ONCE(psock->progs.stream_parser)) ||
(skb_verdict && READ_ONCE(psock->progs.skb_verdict)) ||
(skb_verdict && READ_ONCE(psock->progs.stream_verdict)) ||
(stream_verdict && READ_ONCE(psock->progs.skb_verdict)) ||
(stream_verdict && READ_ONCE(psock->progs.stream_verdict))) {
sk_psock_put(sk, psock);
ret = -EBUSY;
@ -309,6 +324,9 @@ no_progs:
} else if (!stream_parser && stream_verdict && !psock->saved_data_ready) {
psock_set_prog(&psock->progs.stream_verdict, stream_verdict);
sk_psock_start_verdict(sk,psock);
} else if (!stream_verdict && skb_verdict && !psock->saved_data_ready) {
psock_set_prog(&psock->progs.skb_verdict, skb_verdict);
sk_psock_start_verdict(sk, psock);
}
write_unlock_bh(&sk->sk_callback_lock);
return 0;
@ -317,6 +335,9 @@ out_unlock_drop:
out_drop:
sk_psock_put(sk, psock);
out_progs:
if (skb_verdict)
bpf_prog_put(skb_verdict);
out_put_msg_parser:
if (msg_parser)
bpf_prog_put(msg_parser);
out_put_stream_parser:
@ -1442,8 +1463,15 @@ static int sock_map_prog_update(struct bpf_map *map, struct bpf_prog *prog,
break;
#endif
case BPF_SK_SKB_STREAM_VERDICT:
if (progs->skb_verdict)
return -EBUSY;
pprog = &progs->stream_verdict;
break;
case BPF_SK_SKB_VERDICT:
if (progs->stream_verdict)
return -EBUSY;
pprog = &progs->skb_verdict;
break;
default:
return -EOPNOTSUPP;
}

1
tools/bpf/bpftool/common.c
View File

@ -57,6 +57,7 @@ const char * const attach_type_name[__MAX_BPF_ATTACH_TYPE] = {
[BPF_SK_SKB_STREAM_PARSER] = "sk_skb_stream_parser",
[BPF_SK_SKB_STREAM_VERDICT] = "sk_skb_stream_verdict",
[BPF_SK_SKB_VERDICT] = "sk_skb_verdict",
[BPF_SK_MSG_VERDICT] = "sk_msg_verdict",
[BPF_LIRC_MODE2] = "lirc_mode2",
[BPF_FLOW_DISSECTOR] = "flow_dissector",

1
tools/bpf/bpftool/prog.c
View File

@ -76,6 +76,7 @@ enum dump_mode {
static const char * const attach_type_strings[] = {
[BPF_SK_SKB_STREAM_PARSER] = "stream_parser",
[BPF_SK_SKB_STREAM_VERDICT] = "stream_verdict",
[BPF_SK_SKB_VERDICT] = "skb_verdict",
[BPF_SK_MSG_VERDICT] = "msg_verdict",
[BPF_FLOW_DISSECTOR] = "flow_dissector",
[__MAX_BPF_ATTACH_TYPE] = NULL,

1
tools/include/uapi/linux/bpf.h
View File

@ -957,6 +957,7 @@ enum bpf_attach_type {
BPF_XDP_CPUMAP,
BPF_SK_LOOKUP,
BPF_XDP,
BPF_SK_SKB_VERDICT,
__MAX_BPF_ATTACH_TYPE
};