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* [PATCH bpf-next v3 0/2] Get ingress_ifindex in BPF_SK_LOOKUP prog type
@ 2021-11-10 11:10 Mark Pashmfouroush
  2021-11-10 11:10 ` [PATCH bpf-next v3 1/2] bpf: Add ingress_ifindex to bpf_sk_lookup Mark Pashmfouroush
                   ` (2 more replies)
  0 siblings, 3 replies; 4+ messages in thread
From: Mark Pashmfouroush @ 2021-11-10 11:10 UTC (permalink / raw)
  To: markpash, Alexei Starovoitov, Daniel Borkmann, Andrii Nakryiko
  Cc: kernel-team, netdev, bpf

BPF_SK_LOOKUP users may want to have access to the ifindex of the skb
which triggered the socket lookup. This may be useful for selectively
applying programmable socket lookup logic to packets that arrive on a
specific interface, or excluding packets from an interface.

v3:
- Rename ifindex field to ingress_ifindex for consistency. (Yonghong)

v2:
- Fix inaccurate comment (Alexei)
- Add more details to commit messages (John)

Mark Pashmfouroush (2):
  bpf: Add ingress_ifindex to bpf_sk_lookup
  selftests/bpf: Add tests for accessing ingress_ifindex in
    bpf_sk_lookup

 include/linux/filter.h                        |  7 ++--
 include/uapi/linux/bpf.h                      |  1 +
 net/core/filter.c                             |  7 ++++
 net/ipv4/inet_hashtables.c                    |  8 ++---
 net/ipv4/udp.c                                |  8 ++---
 net/ipv6/inet6_hashtables.c                   |  8 ++---
 net/ipv6/udp.c                                |  8 ++---
 tools/include/uapi/linux/bpf.h                |  1 +
 .../selftests/bpf/prog_tests/sk_lookup.c      | 31 ++++++++++++++++++
 .../selftests/bpf/progs/test_sk_lookup.c      |  8 +++++
 .../selftests/bpf/verifier/ctx_sk_lookup.c    | 32 +++++++++++++++++++
 11 files changed, 101 insertions(+), 18 deletions(-)

-- 
2.31.1


^ permalink raw reply	[flat|nested] 4+ messages in thread
* [PATCH bpf-next v3 1/2] bpf: Add ingress_ifindex to bpf_sk_lookup
  2021-11-10 11:10 [PATCH bpf-next v3 0/2] Get ingress_ifindex in BPF_SK_LOOKUP prog type Mark Pashmfouroush
@ 2021-11-10 11:10 ` Mark Pashmfouroush
  2021-11-10 11:10 ` [PATCH bpf-next v3 2/2] selftests/bpf: Add tests for accessing ingress_ifindex in bpf_sk_lookup Mark Pashmfouroush
  2021-11-10 11:54 ` [PATCH bpf-next v3 0/2] Get ingress_ifindex in BPF_SK_LOOKUP prog type Lorenz Bauer
  2 siblings, 0 replies; 4+ messages in thread
From: Mark Pashmfouroush @ 2021-11-10 11:10 UTC (permalink / raw)
  To: markpash, Alexei Starovoitov, Daniel Borkmann, Andrii Nakryiko,
	David S. Miller, Jakub Kicinski, Hideaki YOSHIFUJI, David Ahern
  Cc: kernel-team, netdev, bpf, linux-kernel

It may be helpful to have access to the ifindex during bpf socket
lookup. An example may be to scope certain socket lookup logic to
specific interfaces, i.e. an interface may be made exempt from custom
lookup code.

Add the ifindex of the arriving connection to the bpf_sk_lookup API.

Signed-off-by: Mark Pashmfouroush <markpash@cloudflare.com>

diff --git a/include/linux/filter.h b/include/linux/filter.h
index 24b7ed2677af..b6a216eb217a 100644
--- a/include/linux/filter.h
+++ b/include/linux/filter.h
@@ -1374,6 +1374,7 @@ struct bpf_sk_lookup_kern {
 		const struct in6_addr *daddr;
 	} v6;
 	struct sock	*selected_sk;
+	u32		ingress_ifindex;
 	bool		no_reuseport;
 };
 
@@ -1436,7 +1437,7 @@ extern struct static_key_false bpf_sk_lookup_enabled;
 static inline bool bpf_sk_lookup_run_v4(struct net *net, int protocol,
 					const __be32 saddr, const __be16 sport,
 					const __be32 daddr, const u16 dport,
-					struct sock **psk)
+					const int ifindex, struct sock **psk)
 {
 	struct bpf_prog_array *run_array;
 	struct sock *selected_sk = NULL;
@@ -1452,6 +1453,7 @@ static inline bool bpf_sk_lookup_run_v4(struct net *net, int protocol,
 			.v4.daddr	= daddr,
 			.sport		= sport,
 			.dport		= dport,
+			.ingress_ifindex	= ifindex,
 		};
 		u32 act;
 
@@ -1474,7 +1476,7 @@ static inline bool bpf_sk_lookup_run_v6(struct net *net, int protocol,
 					const __be16 sport,
 					const struct in6_addr *daddr,
 					const u16 dport,
-					struct sock **psk)
+					const int ifindex, struct sock **psk)
 {
 	struct bpf_prog_array *run_array;
 	struct sock *selected_sk = NULL;
@@ -1490,6 +1492,7 @@ static inline bool bpf_sk_lookup_run_v6(struct net *net, int protocol,
 			.v6.daddr	= daddr,
 			.sport		= sport,
 			.dport		= dport,
+			.ingress_ifindex	= ifindex,
 		};
 		u32 act;
 
diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h
index 509eee5f0393..6297eafdc40f 100644
--- a/include/uapi/linux/bpf.h
+++ b/include/uapi/linux/bpf.h
@@ -6316,6 +6316,7 @@ struct bpf_sk_lookup {
 	__u32 local_ip4;	/* Network byte order */
 	__u32 local_ip6[4];	/* Network byte order */
 	__u32 local_port;	/* Host byte order */
+	__u32 ingress_ifindex;		/* The arriving interface. Determined by inet_iif. */
 };
 
 /*
diff --git a/net/core/filter.c b/net/core/filter.c
index 8e8d3b49c297..315a58466fc9 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -10491,6 +10491,7 @@ static bool sk_lookup_is_valid_access(int off, int size,
 	case bpf_ctx_range_till(struct bpf_sk_lookup, local_ip6[0], local_ip6[3]):
 	case bpf_ctx_range(struct bpf_sk_lookup, remote_port):
 	case bpf_ctx_range(struct bpf_sk_lookup, local_port):
+	case bpf_ctx_range(struct bpf_sk_lookup, ingress_ifindex):
 		bpf_ctx_record_field_size(info, sizeof(__u32));
 		return bpf_ctx_narrow_access_ok(off, size, sizeof(__u32));
 
@@ -10580,6 +10581,12 @@ static u32 sk_lookup_convert_ctx_access(enum bpf_access_type type,
 				      bpf_target_off(struct bpf_sk_lookup_kern,
 						     dport, 2, target_size));
 		break;
+
+	case offsetof(struct bpf_sk_lookup, ingress_ifindex):
+		*insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg,
+				      bpf_target_off(struct bpf_sk_lookup_kern,
+						     ingress_ifindex, 4, target_size));
+		break;
 	}
 
 	return insn - insn_buf;
diff --git a/net/ipv4/inet_hashtables.c b/net/ipv4/inet_hashtables.c
index 75737267746f..30ab717ff1b8 100644
--- a/net/ipv4/inet_hashtables.c
+++ b/net/ipv4/inet_hashtables.c
@@ -307,7 +307,7 @@ static inline struct sock *inet_lookup_run_bpf(struct net *net,
 					       struct inet_hashinfo *hashinfo,
 					       struct sk_buff *skb, int doff,
 					       __be32 saddr, __be16 sport,
-					       __be32 daddr, u16 hnum)
+					       __be32 daddr, u16 hnum, const int dif)
 {
 	struct sock *sk, *reuse_sk;
 	bool no_reuseport;
@@ -315,8 +315,8 @@ static inline struct sock *inet_lookup_run_bpf(struct net *net,
 	if (hashinfo != &tcp_hashinfo)
 		return NULL; /* only TCP is supported */
 
-	no_reuseport = bpf_sk_lookup_run_v4(net, IPPROTO_TCP,
-					    saddr, sport, daddr, hnum, &sk);
+	no_reuseport = bpf_sk_lookup_run_v4(net, IPPROTO_TCP, saddr, sport,
+					    daddr, hnum, dif, &sk);
 	if (no_reuseport || IS_ERR_OR_NULL(sk))
 		return sk;
 
@@ -340,7 +340,7 @@ struct sock *__inet_lookup_listener(struct net *net,
 	/* Lookup redirect from BPF */
 	if (static_branch_unlikely(&bpf_sk_lookup_enabled)) {
 		result = inet_lookup_run_bpf(net, hashinfo, skb, doff,
-					     saddr, sport, daddr, hnum);
+					     saddr, sport, daddr, hnum, dif);
 		if (result)
 			goto done;
 	}
diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index 2fffcf2b54f3..5fceee3de65d 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -460,7 +460,7 @@ static struct sock *udp4_lookup_run_bpf(struct net *net,
 					struct udp_table *udptable,
 					struct sk_buff *skb,
 					__be32 saddr, __be16 sport,
-					__be32 daddr, u16 hnum)
+					__be32 daddr, u16 hnum, const int dif)
 {
 	struct sock *sk, *reuse_sk;
 	bool no_reuseport;
@@ -468,8 +468,8 @@ static struct sock *udp4_lookup_run_bpf(struct net *net,
 	if (udptable != &udp_table)
 		return NULL; /* only UDP is supported */
 
-	no_reuseport = bpf_sk_lookup_run_v4(net, IPPROTO_UDP,
-					    saddr, sport, daddr, hnum, &sk);
+	no_reuseport = bpf_sk_lookup_run_v4(net, IPPROTO_UDP, saddr, sport,
+					    daddr, hnum, dif, &sk);
 	if (no_reuseport || IS_ERR_OR_NULL(sk))
 		return sk;
 
@@ -505,7 +505,7 @@ struct sock *__udp4_lib_lookup(struct net *net, __be32 saddr,
 	/* Lookup redirect from BPF */
 	if (static_branch_unlikely(&bpf_sk_lookup_enabled)) {
 		sk = udp4_lookup_run_bpf(net, udptable, skb,
-					 saddr, sport, daddr, hnum);
+					 saddr, sport, daddr, hnum, dif);
 		if (sk) {
 			result = sk;
 			goto done;
diff --git a/net/ipv6/inet6_hashtables.c b/net/ipv6/inet6_hashtables.c
index 67c9114835c8..4514444e96c8 100644
--- a/net/ipv6/inet6_hashtables.c
+++ b/net/ipv6/inet6_hashtables.c
@@ -165,7 +165,7 @@ static inline struct sock *inet6_lookup_run_bpf(struct net *net,
 						const struct in6_addr *saddr,
 						const __be16 sport,
 						const struct in6_addr *daddr,
-						const u16 hnum)
+						const u16 hnum, const int dif)
 {
 	struct sock *sk, *reuse_sk;
 	bool no_reuseport;
@@ -173,8 +173,8 @@ static inline struct sock *inet6_lookup_run_bpf(struct net *net,
 	if (hashinfo != &tcp_hashinfo)
 		return NULL; /* only TCP is supported */
 
-	no_reuseport = bpf_sk_lookup_run_v6(net, IPPROTO_TCP,
-					    saddr, sport, daddr, hnum, &sk);
+	no_reuseport = bpf_sk_lookup_run_v6(net, IPPROTO_TCP, saddr, sport,
+					    daddr, hnum, dif, &sk);
 	if (no_reuseport || IS_ERR_OR_NULL(sk))
 		return sk;
 
@@ -198,7 +198,7 @@ struct sock *inet6_lookup_listener(struct net *net,
 	/* Lookup redirect from BPF */
 	if (static_branch_unlikely(&bpf_sk_lookup_enabled)) {
 		result = inet6_lookup_run_bpf(net, hashinfo, skb, doff,
-					      saddr, sport, daddr, hnum);
+					      saddr, sport, daddr, hnum, dif);
 		if (result)
 			goto done;
 	}
diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
index 12c12619ee35..ea4ea525f94a 100644
--- a/net/ipv6/udp.c
+++ b/net/ipv6/udp.c
@@ -195,7 +195,7 @@ static inline struct sock *udp6_lookup_run_bpf(struct net *net,
 					       const struct in6_addr *saddr,
 					       __be16 sport,
 					       const struct in6_addr *daddr,
-					       u16 hnum)
+					       u16 hnum, const int dif)
 {
 	struct sock *sk, *reuse_sk;
 	bool no_reuseport;
@@ -203,8 +203,8 @@ static inline struct sock *udp6_lookup_run_bpf(struct net *net,
 	if (udptable != &udp_table)
 		return NULL; /* only UDP is supported */
 
-	no_reuseport = bpf_sk_lookup_run_v6(net, IPPROTO_UDP,
-					    saddr, sport, daddr, hnum, &sk);
+	no_reuseport = bpf_sk_lookup_run_v6(net, IPPROTO_UDP, saddr, sport,
+					    daddr, hnum, dif, &sk);
 	if (no_reuseport || IS_ERR_OR_NULL(sk))
 		return sk;
 
@@ -240,7 +240,7 @@ struct sock *__udp6_lib_lookup(struct net *net,
 	/* Lookup redirect from BPF */
 	if (static_branch_unlikely(&bpf_sk_lookup_enabled)) {
 		sk = udp6_lookup_run_bpf(net, udptable, skb,
-					 saddr, sport, daddr, hnum);
+					 saddr, sport, daddr, hnum, dif);
 		if (sk) {
 			result = sk;
 			goto done;
diff --git a/tools/include/uapi/linux/bpf.h b/tools/include/uapi/linux/bpf.h
index 509eee5f0393..6297eafdc40f 100644
--- a/tools/include/uapi/linux/bpf.h
+++ b/tools/include/uapi/linux/bpf.h
@@ -6316,6 +6316,7 @@ struct bpf_sk_lookup {
 	__u32 local_ip4;	/* Network byte order */
 	__u32 local_ip6[4];	/* Network byte order */
 	__u32 local_port;	/* Host byte order */
+	__u32 ingress_ifindex;		/* The arriving interface. Determined by inet_iif. */
 };
 
 /*
-- 
2.31.1


^ permalink raw reply related	[flat|nested] 4+ messages in thread
* [PATCH bpf-next v3 2/2] selftests/bpf: Add tests for accessing ingress_ifindex in bpf_sk_lookup
  2021-11-10 11:10 [PATCH bpf-next v3 0/2] Get ingress_ifindex in BPF_SK_LOOKUP prog type Mark Pashmfouroush
  2021-11-10 11:10 ` [PATCH bpf-next v3 1/2] bpf: Add ingress_ifindex to bpf_sk_lookup Mark Pashmfouroush
@ 2021-11-10 11:10 ` Mark Pashmfouroush
  2021-11-10 11:54 ` [PATCH bpf-next v3 0/2] Get ingress_ifindex in BPF_SK_LOOKUP prog type Lorenz Bauer
  2 siblings, 0 replies; 4+ messages in thread
From: Mark Pashmfouroush @ 2021-11-10 11:10 UTC (permalink / raw)
  To: markpash, Shuah Khan, Alexei Starovoitov, Daniel Borkmann,
	Andrii Nakryiko
  Cc: kernel-team, linux-kselftest, netdev, bpf, linux-kernel

A new field was added to the bpf_sk_lookup data that users can access.
Add tests that validate that the new ingress_ifindex field contains the
right data.

Signed-off-by: Mark Pashmfouroush <markpash@cloudflare.com>

diff --git a/tools/testing/selftests/bpf/prog_tests/sk_lookup.c b/tools/testing/selftests/bpf/prog_tests/sk_lookup.c
index 6db07401bc49..57846cc7ce36 100644
--- a/tools/testing/selftests/bpf/prog_tests/sk_lookup.c
+++ b/tools/testing/selftests/bpf/prog_tests/sk_lookup.c
@@ -937,6 +937,37 @@ static void test_drop_on_lookup(struct test_sk_lookup *skel)
 			.connect_to	= { EXT_IP6, EXT_PORT },
 			.listen_at	= { EXT_IP6, INT_PORT },
 		},
+		/* The program will drop on success, meaning that the ifindex
+		 * was 1.
+		 */
+		{
+			.desc		= "TCP IPv4 drop on valid ifindex",
+			.lookup_prog	= skel->progs.check_ifindex,
+			.sotype		= SOCK_STREAM,
+			.connect_to	= { EXT_IP4, EXT_PORT },
+			.listen_at	= { EXT_IP4, EXT_PORT },
+		},
+		{
+			.desc		= "TCP IPv6 drop on valid ifindex",
+			.lookup_prog	= skel->progs.check_ifindex,
+			.sotype		= SOCK_STREAM,
+			.connect_to	= { EXT_IP6, EXT_PORT },
+			.listen_at	= { EXT_IP6, EXT_PORT },
+		},
+		{
+			.desc		= "UDP IPv4 drop on valid ifindex",
+			.lookup_prog	= skel->progs.check_ifindex,
+			.sotype		= SOCK_DGRAM,
+			.connect_to	= { EXT_IP4, EXT_PORT },
+			.listen_at	= { EXT_IP4, EXT_PORT },
+		},
+		{
+			.desc		= "UDP IPv6 drop on valid ifindex",
+			.lookup_prog	= skel->progs.check_ifindex,
+			.sotype		= SOCK_DGRAM,
+			.connect_to	= { EXT_IP6, EXT_PORT },
+			.listen_at	= { EXT_IP6, EXT_PORT },
+		},
 	};
 	const struct test *t;
 
diff --git a/tools/testing/selftests/bpf/progs/test_sk_lookup.c b/tools/testing/selftests/bpf/progs/test_sk_lookup.c
index 19d2465d9442..83b0aaa52ef7 100644
--- a/tools/testing/selftests/bpf/progs/test_sk_lookup.c
+++ b/tools/testing/selftests/bpf/progs/test_sk_lookup.c
@@ -84,6 +84,14 @@ int lookup_drop(struct bpf_sk_lookup *ctx)
 	return SK_DROP;
 }
 
+SEC("sk_lookup")
+int check_ifindex(struct bpf_sk_lookup *ctx)
+{
+	if (ctx->ingress_ifindex == 1)
+		return SK_DROP;
+	return SK_PASS;
+}
+
 SEC("sk_reuseport")
 int reuseport_pass(struct sk_reuseport_md *ctx)
 {
diff --git a/tools/testing/selftests/bpf/verifier/ctx_sk_lookup.c b/tools/testing/selftests/bpf/verifier/ctx_sk_lookup.c
index d78627be060f..a2b006e2fd06 100644
--- a/tools/testing/selftests/bpf/verifier/ctx_sk_lookup.c
+++ b/tools/testing/selftests/bpf/verifier/ctx_sk_lookup.c
@@ -229,6 +229,24 @@
 		BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_1,
 			    offsetof(struct bpf_sk_lookup, local_port)),
 
+		/* 1-byte read from ingress_ifindex field */
+		BPF_LDX_MEM(BPF_B, BPF_REG_0, BPF_REG_1,
+			    offsetof(struct bpf_sk_lookup, ingress_ifindex)),
+		BPF_LDX_MEM(BPF_B, BPF_REG_0, BPF_REG_1,
+			    offsetof(struct bpf_sk_lookup, ingress_ifindex) + 1),
+		BPF_LDX_MEM(BPF_B, BPF_REG_0, BPF_REG_1,
+			    offsetof(struct bpf_sk_lookup, ingress_ifindex) + 2),
+		BPF_LDX_MEM(BPF_B, BPF_REG_0, BPF_REG_1,
+			    offsetof(struct bpf_sk_lookup, ingress_ifindex) + 3),
+		/* 2-byte read from ingress_ifindex field */
+		BPF_LDX_MEM(BPF_H, BPF_REG_0, BPF_REG_1,
+			    offsetof(struct bpf_sk_lookup, ingress_ifindex)),
+		BPF_LDX_MEM(BPF_H, BPF_REG_0, BPF_REG_1,
+			    offsetof(struct bpf_sk_lookup, ingress_ifindex) + 2),
+		/* 4-byte read from ingress_ifindex field */
+		BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_1,
+			    offsetof(struct bpf_sk_lookup, ingress_ifindex)),
+
 		/* 8-byte read from sk field */
 		BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_1,
 			    offsetof(struct bpf_sk_lookup, sk)),
@@ -351,6 +369,20 @@
 	.expected_attach_type = BPF_SK_LOOKUP,
 	.flags = F_NEEDS_EFFICIENT_UNALIGNED_ACCESS,
 },
+{
+	"invalid 8-byte read from bpf_sk_lookup ingress_ifindex field",
+	.insns = {
+		BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_1,
+			    offsetof(struct bpf_sk_lookup, ingress_ifindex)),
+		BPF_MOV32_IMM(BPF_REG_0, 0),
+		BPF_EXIT_INSN(),
+	},
+	.errstr = "invalid bpf_context access",
+	.result = REJECT,
+	.prog_type = BPF_PROG_TYPE_SK_LOOKUP,
+	.expected_attach_type = BPF_SK_LOOKUP,
+	.flags = F_NEEDS_EFFICIENT_UNALIGNED_ACCESS,
+},
 /* invalid 1,2,4-byte reads from 8-byte fields in bpf_sk_lookup */
 {
 	"invalid 4-byte read from bpf_sk_lookup sk field",
-- 
2.31.1


^ permalink raw reply related	[flat|nested] 4+ messages in thread
* Re: [PATCH bpf-next v3 0/2] Get ingress_ifindex in BPF_SK_LOOKUP prog type
  2021-11-10 11:10 [PATCH bpf-next v3 0/2] Get ingress_ifindex in BPF_SK_LOOKUP prog type Mark Pashmfouroush
  2021-11-10 11:10 ` [PATCH bpf-next v3 1/2] bpf: Add ingress_ifindex to bpf_sk_lookup Mark Pashmfouroush
  2021-11-10 11:10 ` [PATCH bpf-next v3 2/2] selftests/bpf: Add tests for accessing ingress_ifindex in bpf_sk_lookup Mark Pashmfouroush
@ 2021-11-10 11:54 ` Lorenz Bauer
  2 siblings, 0 replies; 4+ messages in thread
From: Lorenz Bauer @ 2021-11-10 11:54 UTC (permalink / raw)
  To: Mark Pashmfouroush
  Cc: Alexei Starovoitov, Daniel Borkmann, Andrii Nakryiko,
	kernel-team, Networking, bpf

On Wed, 10 Nov 2021 at 11:10, Mark Pashmfouroush
<markpash@cloudflare.com> wrote:
>
> BPF_SK_LOOKUP users may want to have access to the ifindex of the skb
> which triggered the socket lookup. This may be useful for selectively
> applying programmable socket lookup logic to packets that arrive on a
> specific interface, or excluding packets from an interface.
>

For the series:

Revieview-by: Lorenz Bauer <lmb@cloudflare.com>

-- 
Lorenz Bauer  |  Systems Engineer
6th Floor, County Hall/The Riverside Building, SE1 7PB, UK

www.cloudflare.com

^ permalink raw reply	[flat|nested] 4+ messages in thread
end of thread, other threads:[~2021-11-10 11:55 UTC | newest]

Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-11-10 11:10 [PATCH bpf-next v3 0/2] Get ingress_ifindex in BPF_SK_LOOKUP prog type Mark Pashmfouroush
2021-11-10 11:10 ` [PATCH bpf-next v3 1/2] bpf: Add ingress_ifindex to bpf_sk_lookup Mark Pashmfouroush
2021-11-10 11:10 ` [PATCH bpf-next v3 2/2] selftests/bpf: Add tests for accessing ingress_ifindex in bpf_sk_lookup Mark Pashmfouroush
2021-11-10 11:54 ` [PATCH bpf-next v3 0/2] Get ingress_ifindex in BPF_SK_LOOKUP prog type Lorenz Bauer

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