netdev - [PATCH bpf-next 1/2] bpf: add helper for getting xfrm states

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Date:   Tue, 17 Apr 2018 07:48:48 +0300
From:   Eyal Birger <eyal.birger@...il.com>
To:     netdev@...r.kernel.org
Cc:     shmulik@...anetworks.com, ast@...nel.org, daniel@...earbox.net,
        fw@...len.de, steffen.klassert@...unet.com,
        Eyal Birger <eyal.birger@...il.com>
Subject: [PATCH bpf-next 1/2] bpf: add helper for getting xfrm states

This commit introduces a helper which allows fetching xfrm state
parameters by eBPF programs attached to TC.

Prototype:
bpf_skb_get_xfrm_state(skb, index, xfrm_state, size, flags)

skb: pointer to skb
index: the index in the skb xfrm_state secpath array
xfrm_state: pointer to 'struct bpf_xfrm_state'
size: size of 'struct bpf_xfrm_state'
flags: reserved for future extensions

The helper returns 0 on success. Non zero if no xfrm state at the index
is found - or non exists at all.

struct bpf_xfrm_state currently includes the SPI, peer IPv4/IPv6
address and the reqid; it can be further extended by adding elements to
its end - indicating the populated fields by the 'size' argument -
keeping backwards compatibility.

Typical usage:

struct bpf_xfrm_state x = {};
bpf_skb_get_xfrm_state(skb, 0, &x, sizeof(x), 0);
...

Signed-off-by: Eyal Birger <eyal.birger@...il.com>
---
 include/uapi/linux/bpf.h | 25 ++++++++++++++++++++++++-
 net/core/filter.c        | 46 ++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 70 insertions(+), 1 deletion(-)

diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h
index c5ec897..132e172 100644
--- a/include/uapi/linux/bpf.h
+++ b/include/uapi/linux/bpf.h
@@ -755,6 +755,15 @@ union bpf_attr {
  *     @addr: pointer to struct sockaddr to bind socket to
  *     @addr_len: length of sockaddr structure
  *     Return: 0 on success or negative error code
+ *
+ * int bpf_skb_get_xfrm_state(skb, index, xfrm_state, size, flags)
+ *     retrieve XFRM state
+ *     @skb: pointer to skb
+ *     @index: index of the xfrm state in the secpath
+ *     @key: pointer to 'struct bpf_xfrm_state'
+ *     @size: size of 'struct bpf_xfrm_state'
+ *     @flags: room for future extensions
+ *     Return: 0 on success or negative error
  */
 #define __BPF_FUNC_MAPPER(FN)		\
 	FN(unspec),			\
@@ -821,7 +830,8 @@ union bpf_attr {
 	FN(msg_apply_bytes),		\
 	FN(msg_cork_bytes),		\
 	FN(msg_pull_data),		\
-	FN(bind),
+	FN(bind),			\
+	FN(skb_get_xfrm_state),
 
 /* integer value in 'imm' field of BPF_CALL instruction selects which helper
  * function eBPF program intends to call
@@ -927,6 +937,19 @@ struct bpf_tunnel_key {
 	__u32 tunnel_label;
 };
 
+/* user accessible mirror of in-kernel xfrm_state.
+ * new fields can only be added to the end of this structure
+ */
+struct bpf_xfrm_state {
+	__u32 reqid;
+	__u32 spi;
+	__u16 family;
+	union {
+		__u32 remote_ipv4;
+		__u32 remote_ipv6[4];
+	};
+};
+
 /* Generic BPF return codes which all BPF program types may support.
  * The values are binary compatible with their TC_ACT_* counter-part to
  * provide backwards compatibility with existing SCHED_CLS and SCHED_ACT
diff --git a/net/core/filter.c b/net/core/filter.c
index d31aff9..c06600a 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -57,6 +57,7 @@
 #include <net/sock_reuseport.h>
 #include <net/busy_poll.h>
 #include <net/tcp.h>
+#include <net/xfrm.h>
 #include <linux/bpf_trace.h>
 
 /**
@@ -3703,6 +3704,49 @@ static const struct bpf_func_proto bpf_bind_proto = {
 	.arg3_type	= ARG_CONST_SIZE,
 };
 
+BPF_CALL_5(bpf_skb_get_xfrm_state, struct sk_buff *, skb, u32, index,
+	   struct bpf_xfrm_state *, to, u32, size, u64, flags)
+{
+#ifdef CONFIG_XFRM
+	const struct sec_path *sp = skb_sec_path(skb);
+	const struct xfrm_state *x;
+
+	if (!sp || index >= sp->len)
+		goto err_clear;
+
+	x = sp->xvec[index];
+
+	if (unlikely(size != sizeof(struct bpf_xfrm_state)))
+		goto err_clear;
+
+	to->reqid = x->props.reqid;
+	to->spi = be32_to_cpu(x->id.spi);
+	to->family = x->props.family;
+	if (to->family == AF_INET6) {
+		memcpy(to->remote_ipv6, x->props.saddr.a6,
+		       sizeof(to->remote_ipv6));
+	} else {
+		to->remote_ipv4 = be32_to_cpu(x->props.saddr.a4);
+	}
+
+	return 0;
+err_clear:
+#endif
+	memset(to, 0, size);
+	return -EINVAL;
+}
+
+static const struct bpf_func_proto bpf_skb_get_xfrm_state_proto = {
+	.func		= bpf_skb_get_xfrm_state,
+	.gpl_only	= false,
+	.ret_type	= RET_INTEGER,
+	.arg1_type	= ARG_PTR_TO_CTX,
+	.arg2_type	= ARG_ANYTHING,
+	.arg3_type	= ARG_PTR_TO_UNINIT_MEM,
+	.arg4_type	= ARG_CONST_SIZE,
+	.arg5_type	= ARG_ANYTHING,
+};
+
 static const struct bpf_func_proto *
 bpf_base_func_proto(enum bpf_func_id func_id)
 {
@@ -3844,6 +3888,8 @@ tc_cls_act_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
 		return &bpf_get_socket_cookie_proto;
 	case BPF_FUNC_get_socket_uid:
 		return &bpf_get_socket_uid_proto;
+	case BPF_FUNC_skb_get_xfrm_state:
+		return &bpf_skb_get_xfrm_state_proto;
 	default:
 		return bpf_base_func_proto(func_id);
 	}
-- 
2.7.4