[RFC PATCH bpf-next v2 15/17] tools/bpf: selftests: add dumper programs for ipv6_route and netlink

Yonghong Song
2020-04-15T19:32:17Z

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/kernel/bpfdump/netlink/my1
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/kernel/bpfdump/ipv6_route/my1
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

Signed-off-by: Yonghong Song <yhs@fb.com>
---
.../selftests/bpf/progs/bpfdump_ipv6_route.c | 71 ++++++++++++++++
.../selftests/bpf/progs/bpfdump_netlink.c | 80 +++++++++++++++++++
2 files changed, 151 insertions(+)
create mode 100644 tools/testing/selftests/bpf/progs/bpfdump_ipv6_route.c
create mode 100644 tools/testing/selftests/bpf/progs/bpfdump_netlink.c

diff --git a/tools/testing/selftests/bpf/progs/bpfdump_ipv6_route.c b/tools/testing/selftests/bpf/progs/bpfdump_ipv6_route.c
new file mode 100644
index 000000000000..ff187577e2b5
--- /dev/null
+++ b/tools/testing/selftests/bpf/progs/bpfdump_ipv6_route.c
@@ -0,0 +1,71 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (c) 2020 Facebook */
+#include "vmlinux.h"
+#include <bpf/bpf_helpers.h>
+#include <bpf/bpf_tracing.h>
+#include <bpf/bpf_endian.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("dump//sys/kernel/bpfdump/ipv6_route")
+int dump_ipv6_route(struct bpfdump__ipv6_route *ctx)
+{
+ static const char fmt1[] = "%pi6 %02x ";
+ static const char fmt2[] = "%pi6 ";
+ static const char fmt3[] = "00000000000000000000000000000000 ";
+ static const char fmt4[] = "%08x %08x ";
+ static const char fmt5[] = "%8s\n";
+ static const char fmt6[] = "\n";
+ static const char fmt7[] = "00000000000000000000000000000000 00 ";
+ 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, fmt1, sizeof(fmt1), &rt->fib6_dst.addr,
+ rt->fib6_dst.plen);
+
+ if (CONFIG_IPV6_SUBTREES)
+ bpf_seq_printf(seq, fmt1, sizeof(fmt1), &rt->fib6_src.addr,
+ rt->fib6_src.plen);
+ else
+ bpf_seq_printf(seq, fmt7, sizeof(fmt7));
+
+ if (fib6_nh->fib_nh_gw_family) {
+ flags |= RTF_GATEWAY;
+ bpf_seq_printf(seq, fmt2, sizeof(fmt2), &fib6_nh->fib_nh_gw6);
+ } else {
+ bpf_seq_printf(seq, fmt3, sizeof(fmt3));
+ }
+
+ dev = fib6_nh->fib_nh_dev;
+ bpf_seq_printf(seq, fmt4, sizeof(fmt4), rt->fib6_metric, rt->fib6_ref.refs.counter);
+ bpf_seq_printf(seq, fmt4, sizeof(fmt4), 0, flags);
+ if (dev)
+ bpf_seq_printf(seq, fmt5, sizeof(fmt5), dev->name);
+ else
+ bpf_seq_printf(seq, fmt6, sizeof(fmt6));
+
+ return 0;
+}
diff --git a/tools/testing/selftests/bpf/progs/bpfdump_netlink.c b/tools/testing/selftests/bpf/progs/bpfdump_netlink.c
new file mode 100644
index 000000000000..8a1aec0ba7d0
--- /dev/null
+++ b/tools/testing/selftests/bpf/progs/bpfdump_netlink.c
@@ -0,0 +1,80 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (c) 2020 Facebook */
+#include "vmlinux.h"
+#include <bpf/bpf_helpers.h>
+#include <bpf/bpf_tracing.h>
+#include <bpf/bpf_endian.h>
+
+char _license[] SEC("license") = "GPL";
+
+#define sk_rmem_alloc sk_backlog.rmem_alloc
+#define sk_refcnt __sk_common.skc_refcnt
+
+#define offsetof(TYPE, MEMBER) ((size_t)&((TYPE *)0)->MEMBER)
+#define container_of(ptr, type, member) ({ \
+ void *__mptr = (void *)(ptr); \
+ ((type *)(__mptr - offsetof(type, member))); })
+
+static inline struct inode *SOCK_INODE(struct socket *socket)
+{
+ return &container_of(socket, struct socket_alloc, socket)->vfs_inode;
+}
+
+SEC("dump//sys/kernel/bpfdump/netlink")
+int dump_netlink(struct bpfdump__netlink *ctx)
+{
+ static const char banner[] =
+ "sk Eth Pid Groups "
+ "Rmem Wmem Dump Locks Drops Inode\n";
+ static const char fmt1[] = "%pK %-3d ";
+ static const char fmt2[] = "%-10u %08x ";
+ static const char fmt3[] = "%-8d %-8d ";
+ static const char fmt4[] = "%-5d %-8d ";
+ static const char fmt5[] = "%-8u %-8lu\n";
+ 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, banner, sizeof(banner));
+
+ s = &nlk->sk;
+ bpf_seq_printf(seq, fmt1, sizeof(fmt1), 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, fmt2, sizeof(fmt2), nlk->portid, (u32)group);
+
+
+ bpf_seq_printf(seq, fmt3, sizeof(fmt3), s->sk_rmem_alloc.counter,
+ s->sk_wmem_alloc.refs.counter - 1);
+ bpf_seq_printf(seq, fmt4, sizeof(fmt4), 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, fmt5, sizeof(fmt5), s->sk_drops.counter, ino);
+
+ return 0;
+}
--
2.24.1