netdev - [bpf-next PATCH 3/3] bpf: sk_msg add get socket storage helpers

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Date:   Wed, 13 May 2020 12:24:58 -0700
From:   John Fastabend <john.fastabend@...il.com>
To:     ast@...nel.org, daniel@...earbox.net
Cc:     lmb@...udflare.com, bpf@...r.kernel.org, john.fastabend@...il.com,
        jakub@...udflare.com, netdev@...r.kernel.org
Subject: [bpf-next PATCH 3/3] bpf: sk_msg add get socket storage helpers

Add helpers to use local socket storage.

Signed-off-by: John Fastabend <john.fastabend@...il.com>
---
 include/uapi/linux/bpf.h |    2 ++
 net/core/filter.c        |   15 +++++++++++++++
 2 files changed, 17 insertions(+)

diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h
index bfb31c1..3ca7cfd 100644
--- a/include/uapi/linux/bpf.h
+++ b/include/uapi/linux/bpf.h
@@ -3607,6 +3607,8 @@ struct sk_msg_md {
 	__u32 remote_port;	/* Stored in network byte order */
 	__u32 local_port;	/* stored in host byte order */
 	__u32 size;		/* Total size of sk_msg */
+
+	__bpf_md_ptr(struct bpf_sock *, sk); /* current socket */
 };
 
 struct sk_reuseport_md {
diff --git a/net/core/filter.c b/net/core/filter.c
index d1c4739..c42adc8 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -6395,6 +6395,10 @@ sk_msg_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
 		return &bpf_get_current_uid_gid_proto;
 	case BPF_FUNC_get_current_pid_tgid:
 		return &bpf_get_current_pid_tgid_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_CGROUPS
 	case BPF_FUNC_get_current_cgroup_id:
 		return &bpf_get_current_cgroup_id_proto;
@@ -7243,6 +7247,11 @@ static bool sk_msg_is_valid_access(int off, int size,
 		if (size != sizeof(__u64))
 			return false;
 		break;
+	case offsetof(struct sk_msg_md, sk):
+		if (size != sizeof(__u64))
+			return false;
+		info->reg_type = PTR_TO_SOCKET;
+		break;
 	case bpf_ctx_range(struct sk_msg_md, family):
 	case bpf_ctx_range(struct sk_msg_md, remote_ip4):
 	case bpf_ctx_range(struct sk_msg_md, local_ip4):
@@ -8577,6 +8586,12 @@ static u32 sk_msg_convert_ctx_access(enum bpf_access_type type,
 				      si->dst_reg, si->src_reg,
 				      offsetof(struct sk_msg_sg, size));
 		break;
+
+	case offsetof(struct sk_msg_md, sk):
+		*insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_msg, sk),
+				      si->dst_reg, si->src_reg,
+				      offsetof(struct sk_msg, sk));
+		break;
 	}
 
 	return insn - insn_buf;