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Message-ID: <158939789875.17281.10136938760299538348.stgit@john-Precision-5820-Tower>
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;
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