netdev - [PATCH net-next] bpf: expose sk_priority through struct bpf_sock

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Date:   Fri, 10 Nov 2017 11:17:09 -0800
From:   Vlad Dumitrescu <vlad@...itrescu.ro>
To:     davem@...emloft.net, ast@...com, daniel@...earbox.net,
        brakmo@...com
Cc:     netdev@...r.kernel.org, kraigatgoog@...il.com
Subject: [PATCH net-next] bpf: expose sk_priority through struct bpf_sock_ops

From: Vlad Dumitrescu <vladum@...gle.com>

Allows BPF_PROG_TYPE_SOCK_OPS programs to read sk_priority.

Signed-off-by: Vlad Dumitrescu <vladum@...gle.com>
---
 include/uapi/linux/bpf.h       |  1 +
 net/core/filter.c              | 11 +++++++++++
 tools/include/uapi/linux/bpf.h |  1 +
 3 files changed, 13 insertions(+)

diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h
index e880ae6434ee..9757a2002513 100644
--- a/include/uapi/linux/bpf.h
+++ b/include/uapi/linux/bpf.h
@@ -947,6 +947,7 @@ struct bpf_sock_ops {
 	__u32 local_ip6[4];	/* Stored in network byte order */
 	__u32 remote_port;	/* Stored in network byte order */
 	__u32 local_port;	/* stored in host byte order */
+	__u32 priority;
 };
 
 /* List of known BPF sock_ops operators.
diff --git a/net/core/filter.c b/net/core/filter.c
index 61c791f9f628..a6329642d047 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -4449,6 +4449,17 @@ static u32 sock_ops_convert_ctx_access(enum bpf_access_type type,
 		*insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg,
 				      offsetof(struct sock_common, skc_num));
 		break;
+
+	case offsetof(struct bpf_sock_ops, priority):
+		BUILD_BUG_ON(FIELD_SIZEOF(struct sock, sk_priority) != 4);
+
+		*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));
+		*insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
+				      offsetof(struct sock, sk_priority));
+		break;
 	}
 	return insn - insn_buf;
 }
diff --git a/tools/include/uapi/linux/bpf.h b/tools/include/uapi/linux/bpf.h
index e880ae6434ee..9757a2002513 100644
--- a/tools/include/uapi/linux/bpf.h
+++ b/tools/include/uapi/linux/bpf.h
@@ -947,6 +947,7 @@ struct bpf_sock_ops {
 	__u32 local_ip6[4];	/* Stored in network byte order */
 	__u32 remote_port;	/* Stored in network byte order */
 	__u32 local_port;	/* stored in host byte order */
+	__u32 priority;
 };
 
 /* List of known BPF sock_ops operators.
-- 
2.15.0.448.gf294e3d99a-goog