From: Yonghong Song <yhs@fb.com>
To: Andrii Nakryiko <andriin@fb.com>, <bpf@vger.kernel.org>,
Martin KaFai Lau <kafai@fb.com>, <netdev@vger.kernel.org>
Cc: Alexei Starovoitov <ast@fb.com>,
Daniel Borkmann <daniel@iogearbox.net>, <kernel-team@fb.com>
Subject: [PATCH bpf-next v3 19/21] tools/bpf: selftests: add iterator programs for ipv6_route and netlink
Date: Wed, 6 May 2020 22:39:37 -0700 [thread overview]
Message-ID: <20200507053937.1545349-1-yhs@fb.com> (raw)
In-Reply-To: <20200507053915.1542140-1-yhs@fb.com>
Two bpf programs are added in this patch for netlink and ipv6_route
target. On my VM, I am able to achieve identical
results compared to /proc/net/netlink and /proc/net/ipv6_route.
$ cat /proc/net/netlink
sk Eth Pid Groups Rmem Wmem Dump Locks Drops Inode
000000002c42d58b 0 0 00000000 0 0 0 2 0 7
00000000a4e8b5e1 0 1 00000551 0 0 0 2 0 18719
00000000e1b1c195 4 0 00000000 0 0 0 2 0 16422
000000007e6b29f9 6 0 00000000 0 0 0 2 0 16424
....
00000000159a170d 15 1862 00000002 0 0 0 2 0 1886
000000009aca4bc9 15 3918224839 00000002 0 0 0 2 0 19076
00000000d0ab31d2 15 1 00000002 0 0 0 2 0 18683
000000008398fb08 16 0 00000000 0 0 0 2 0 27
$ cat /sys/fs/bpf/my_netlink
sk Eth Pid Groups Rmem Wmem Dump Locks Drops Inode
000000002c42d58b 0 0 00000000 0 0 0 2 0 7
00000000a4e8b5e1 0 1 00000551 0 0 0 2 0 18719
00000000e1b1c195 4 0 00000000 0 0 0 2 0 16422
000000007e6b29f9 6 0 00000000 0 0 0 2 0 16424
....
00000000159a170d 15 1862 00000002 0 0 0 2 0 1886
000000009aca4bc9 15 3918224839 00000002 0 0 0 2 0 19076
00000000d0ab31d2 15 1 00000002 0 0 0 2 0 18683
000000008398fb08 16 0 00000000 0 0 0 2 0 27
$ cat /proc/net/ipv6_route
fe800000000000000000000000000000 40 00000000000000000000000000000000 00 00000000000000000000000000000000 00000100 00000001 00000000 00000001 eth0
00000000000000000000000000000000 00 00000000000000000000000000000000 00 00000000000000000000000000000000 ffffffff 00000001 00000000 00200200 lo
00000000000000000000000000000001 80 00000000000000000000000000000000 00 00000000000000000000000000000000 00000000 00000003 00000000 80200001 lo
fe80000000000000c04b03fffe7827ce 80 00000000000000000000000000000000 00 00000000000000000000000000000000 00000000 00000002 00000000 80200001 eth0
ff000000000000000000000000000000 08 00000000000000000000000000000000 00 00000000000000000000000000000000 00000100 00000003 00000000 00000001 eth0
00000000000000000000000000000000 00 00000000000000000000000000000000 00 00000000000000000000000000000000 ffffffff 00000001 00000000 00200200 lo
$ cat /sys/fs/bpf/my_ipv6_route
fe800000000000000000000000000000 40 00000000000000000000000000000000 00 00000000000000000000000000000000 00000100 00000001 00000000 00000001 eth0
00000000000000000000000000000000 00 00000000000000000000000000000000 00 00000000000000000000000000000000 ffffffff 00000001 00000000 00200200 lo
00000000000000000000000000000001 80 00000000000000000000000000000000 00 00000000000000000000000000000000 00000000 00000003 00000000 80200001 lo
fe80000000000000c04b03fffe7827ce 80 00000000000000000000000000000000 00 00000000000000000000000000000000 00000000 00000002 00000000 80200001 eth0
ff000000000000000000000000000000 08 00000000000000000000000000000000 00 00000000000000000000000000000000 00000100 00000003 00000000 00000001 eth0
00000000000000000000000000000000 00 00000000000000000000000000000000 00 00000000000000000000000000000000 ffffffff 00000001 00000000 00200200 lo
Acked-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Yonghong Song <yhs@fb.com>
---
.../selftests/bpf/progs/bpf_iter_ipv6_route.c | 62 +++++++++++++++++
.../selftests/bpf/progs/bpf_iter_netlink.c | 66 +++++++++++++++++++
2 files changed, 128 insertions(+)
create mode 100644 tools/testing/selftests/bpf/progs/bpf_iter_ipv6_route.c
create mode 100644 tools/testing/selftests/bpf/progs/bpf_iter_netlink.c
diff --git a/tools/testing/selftests/bpf/progs/bpf_iter_ipv6_route.c b/tools/testing/selftests/bpf/progs/bpf_iter_ipv6_route.c
new file mode 100644
index 000000000000..ab9e2650e021
--- /dev/null
+++ b/tools/testing/selftests/bpf/progs/bpf_iter_ipv6_route.c
@@ -0,0 +1,62 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (c) 2020 Facebook */
+#include "vmlinux.h"
+#include <bpf/bpf_helpers.h>
+#include <bpf/bpf_tracing.h>
+
+char _license[] SEC("license") = "GPL";
+
+extern bool CONFIG_IPV6_SUBTREES __kconfig __weak;
+
+#define RTF_GATEWAY 0x0002
+#define IFNAMSIZ 16
+#define fib_nh_gw_family nh_common.nhc_gw_family
+#define fib_nh_gw6 nh_common.nhc_gw.ipv6
+#define fib_nh_dev nh_common.nhc_dev
+
+SEC("iter/ipv6_route")
+int dump_ipv6_route(struct bpf_iter__ipv6_route *ctx)
+{
+ struct seq_file *seq = ctx->meta->seq;
+ struct fib6_info *rt = ctx->rt;
+ const struct net_device *dev;
+ struct fib6_nh *fib6_nh;
+ unsigned int flags;
+ struct nexthop *nh;
+
+ if (rt == (void *)0)
+ return 0;
+
+ fib6_nh = &rt->fib6_nh[0];
+ flags = rt->fib6_flags;
+
+ /* FIXME: nexthop_is_multipath is not handled here. */
+ nh = rt->nh;
+ if (rt->nh)
+ fib6_nh = &nh->nh_info->fib6_nh;
+
+ BPF_SEQ_PRINTF(seq, "%pi6 %02x ", &rt->fib6_dst.addr, rt->fib6_dst.plen);
+
+ if (CONFIG_IPV6_SUBTREES)
+ BPF_SEQ_PRINTF(seq, "%pi6 %02x ", &rt->fib6_src.addr,
+ rt->fib6_src.plen);
+ else
+ BPF_SEQ_PRINTF(seq, "00000000000000000000000000000000 00 ");
+
+ if (fib6_nh->fib_nh_gw_family) {
+ flags |= RTF_GATEWAY;
+ BPF_SEQ_PRINTF(seq, "%pi6 ", &fib6_nh->fib_nh_gw6);
+ } else {
+ BPF_SEQ_PRINTF(seq, "00000000000000000000000000000000 ");
+ }
+
+ dev = fib6_nh->fib_nh_dev;
+ if (dev)
+ BPF_SEQ_PRINTF(seq, "%08x %08x %08x %08x %8s\n", rt->fib6_metric,
+ rt->fib6_ref.refs.counter, 0, flags, dev->name);
+ else
+ BPF_SEQ_PRINTF(seq, "%08x %08x %08x %08x\n", rt->fib6_metric,
+ rt->fib6_ref.refs.counter, 0, flags);
+
+ return 0;
+}
diff --git a/tools/testing/selftests/bpf/progs/bpf_iter_netlink.c b/tools/testing/selftests/bpf/progs/bpf_iter_netlink.c
new file mode 100644
index 000000000000..6b40a233d4e0
--- /dev/null
+++ b/tools/testing/selftests/bpf/progs/bpf_iter_netlink.c
@@ -0,0 +1,66 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (c) 2020 Facebook */
+#include "vmlinux.h"
+#include <bpf/bpf_helpers.h>
+#include <bpf/bpf_tracing.h>
+
+char _license[] SEC("license") = "GPL";
+
+#define sk_rmem_alloc sk_backlog.rmem_alloc
+#define sk_refcnt __sk_common.skc_refcnt
+
+static inline struct inode *SOCK_INODE(struct socket *socket)
+{
+ return &container_of(socket, struct socket_alloc, socket)->vfs_inode;
+}
+
+SEC("iter/netlink")
+int dump_netlink(struct bpf_iter__netlink *ctx)
+{
+ struct seq_file *seq = ctx->meta->seq;
+ struct netlink_sock *nlk = ctx->sk;
+ unsigned long group, ino;
+ struct inode *inode;
+ struct socket *sk;
+ struct sock *s;
+
+ if (nlk == (void *)0)
+ return 0;
+
+ if (ctx->meta->seq_num == 0)
+ BPF_SEQ_PRINTF(seq, "sk Eth Pid Groups "
+ "Rmem Wmem Dump Locks Drops "
+ "Inode\n");
+
+ s = &nlk->sk;
+ BPF_SEQ_PRINTF(seq, "%pK %-3d ", s, s->sk_protocol);
+
+ if (!nlk->groups) {
+ group = 0;
+ } else {
+ /* FIXME: temporary use bpf_probe_read here, needs
+ * verifier support to do direct access.
+ */
+ bpf_probe_read(&group, sizeof(group), &nlk->groups[0]);
+ }
+ BPF_SEQ_PRINTF(seq, "%-10u %08x %-8d %-8d %-5d %-8d ",
+ nlk->portid, (u32)group,
+ s->sk_rmem_alloc.counter,
+ s->sk_wmem_alloc.refs.counter - 1,
+ nlk->cb_running, s->sk_refcnt.refs.counter);
+
+ sk = s->sk_socket;
+ if (!sk) {
+ ino = 0;
+ } else {
+ /* FIXME: container_of inside SOCK_INODE has a forced
+ * type conversion, and direct access cannot be used
+ * with current verifier.
+ */
+ inode = SOCK_INODE(sk);
+ bpf_probe_read(&ino, sizeof(ino), &inode->i_ino);
+ }
+ BPF_SEQ_PRINTF(seq, "%-8u %-8lu\n", s->sk_drops.counter, ino);
+
+ return 0;
+}
--
2.24.1
next prev parent reply other threads:[~2020-05-07 5:39 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-07 5:39 [PATCH bpf-next v3 00/21] bpf: implement bpf iterator for kernel data Yonghong Song
2020-05-07 5:39 ` [PATCH bpf-next v3 01/21] bpf: implement an interface to register bpf_iter targets Yonghong Song
2020-05-08 18:18 ` Andrii Nakryiko
2020-05-07 5:39 ` [PATCH bpf-next v3 02/21] bpf: allow loading of a bpf_iter program Yonghong Song
2020-05-08 18:20 ` Andrii Nakryiko
2020-05-07 5:39 ` [PATCH bpf-next v3 03/21] bpf: support bpf tracing/iter programs for BPF_LINK_CREATE Yonghong Song
2020-05-08 18:24 ` Andrii Nakryiko
2020-05-09 1:36 ` Yonghong Song
2020-05-12 3:15 ` Andrii Nakryiko
2020-05-13 16:57 ` Yonghong Song
2020-05-07 5:39 ` [PATCH bpf-next v3 04/21] bpf: support bpf tracing/iter programs for BPF_LINK_UPDATE Yonghong Song
2020-05-07 5:39 ` [PATCH bpf-next v3 05/21] bpf: implement bpf_seq_read() for bpf iterator Yonghong Song
2020-05-08 18:52 ` Andrii Nakryiko
2020-05-09 1:41 ` Yonghong Song
2020-05-07 5:39 ` [PATCH bpf-next v3 06/21] bpf: create anonymous " Yonghong Song
2020-05-08 18:57 ` Andrii Nakryiko
2020-05-07 5:39 ` [PATCH bpf-next v3 07/21] bpf: create file " Yonghong Song
2020-05-07 5:39 ` [PATCH bpf-next v3 08/21] bpf: implement common macros/helpers for target iterators Yonghong Song
2020-05-08 19:07 ` Andrii Nakryiko
2020-05-09 3:18 ` Yonghong Song
2020-05-12 3:16 ` Andrii Nakryiko
2020-05-07 5:39 ` [PATCH bpf-next v3 09/21] bpf: add bpf_map iterator Yonghong Song
2020-05-07 5:39 ` [PATCH bpf-next v3 10/21] net: bpf: add netlink and ipv6_route bpf_iter targets Yonghong Song
2020-05-08 19:17 ` Andrii Nakryiko
2020-05-07 5:39 ` [PATCH bpf-next v3 11/21] bpf: add task and task/file iterator targets Yonghong Song
2020-05-08 19:36 ` Andrii Nakryiko
2020-05-07 5:39 ` [PATCH bpf-next v3 12/21] bpf: add PTR_TO_BTF_ID_OR_NULL support Yonghong Song
2020-05-07 5:39 ` [PATCH bpf-next v3 13/21] bpf: add bpf_seq_printf and bpf_seq_write helpers Yonghong Song
2020-05-08 19:44 ` Andrii Nakryiko
2020-05-09 4:18 ` Yonghong Song
2020-05-09 5:30 ` Alexei Starovoitov
2020-05-09 6:04 ` Yonghong Song
2020-05-07 5:39 ` [PATCH bpf-next v3 14/21] bpf: handle spilled PTR_TO_BTF_ID properly when checking stack_boundary Yonghong Song
2020-05-07 5:39 ` [PATCH bpf-next v3 15/21] bpf: support variable length array in tracing programs Yonghong Song
2020-05-07 5:39 ` [PATCH bpf-next v3 16/21] tools/libbpf: add bpf_iter support Yonghong Song
2020-05-08 19:46 ` Andrii Nakryiko
2020-05-07 5:39 ` [PATCH bpf-next v3 17/21] tools/libpf: add offsetof/container_of macro in bpf_helpers.h Yonghong Song
2020-05-08 19:48 ` Andrii Nakryiko
2020-05-07 5:39 ` [PATCH bpf-next v3 18/21] tools/bpftool: add bpf_iter support for bptool Yonghong Song
2020-05-08 19:51 ` Andrii Nakryiko
2020-05-09 5:26 ` Yonghong Song
2020-05-07 5:39 ` Yonghong Song [this message]
2020-05-07 5:39 ` [PATCH bpf-next v3 20/21] tools/bpf: selftests: add iter progs for bpf_map/task/task_file Yonghong Song
2020-05-07 5:39 ` [PATCH bpf-next v3 21/21] tools/bpf: selftests: add bpf_iter selftests Yonghong Song
2020-05-08 19:57 ` Andrii Nakryiko
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