lkml.org 
[lkml]   [2018]   [Sep]   [5]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 14/77] perf trace augmented_syscalls: Augment connect's 'sockaddr' arg
Date
From: Arnaldo Carvalho de Melo <acme@redhat.com>

As the first example of augmenting something other than a 'filename',
augment the 'struct sockaddr' argument for the 'connect' syscall:

# perf trace -e tools/perf/examples/bpf/augmented_syscalls.c ssh -6 fedorapeople.org
0.000 ssh/29669 connect(fd: 3, uservaddr: { .family: LOCAL, path: /var/run/nscd/socket }, addrlen: 110)
0.042 ssh/29669 connect(fd: 3, uservaddr: { .family: LOCAL, path: /var/run/nscd/socket }, addrlen: 110)
1.329 ssh/29669 connect(fd: 3, uservaddr: { .family: LOCAL, path: /var/run/nscd/socket }, addrlen: 110)
1.362 ssh/29669 connect(fd: 3, uservaddr: { .family: LOCAL, path: /var/run/nscd/socket }, addrlen: 110)
1.458 ssh/29669 connect(fd: 3, uservaddr: { .family: LOCAL, path: /var/run/nscd/socket }, addrlen: 110)
1.478 ssh/29669 connect(fd: 3, uservaddr: { .family: LOCAL, path: /var/run/nscd/socket }, addrlen: 110)
1.683 ssh/29669 connect(fd: 3<socket:[125942]>, uservaddr: { .family: INET, port: 53, addr: 192.168.43.1 }, addrlen: 16)
4.710 ssh/29669 connect(fd: 3<socket:[125942]>, uservaddr: { .family: INET6, port: 22, addr: 2610:28:3090:3001:5054:ff:fea7:9474 }, addrlen: 28)
root@fedorapeople.org: Permission denied (publickey).
#

This is still just augmenting the syscalls:sys_enter_connect part, later
we'll wire this up to augment the enter+exit combo, like in the
tradicional 'perf trace' and 'strace' outputs.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: https://lkml.kernel.org/n/tip-s7l541cbiqb22ifio6z7dpf6@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
tools/perf/builtin-trace.c | 12 +-----
tools/perf/examples/bpf/augmented_syscalls.c | 34 +++++++++++++++-
tools/perf/trace/beauty/Build | 1 +
tools/perf/trace/beauty/beauty.h | 5 +++
tools/perf/trace/beauty/sockaddr.c | 58 ++++++++++++++++++++++++++++
5 files changed, 99 insertions(+), 11 deletions(-)
create mode 100644 tools/perf/trace/beauty/sockaddr.c

diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c
index 5d841114a745..ab2ed30b8dcc 100644
--- a/tools/perf/builtin-trace.c
+++ b/tools/perf/builtin-trace.c
@@ -498,16 +498,6 @@ static const char *clockid[] = {
};
static DEFINE_STRARRAY(clockid);

-static const char *socket_families[] = {
- "UNSPEC", "LOCAL", "INET", "AX25", "IPX", "APPLETALK", "NETROM",
- "BRIDGE", "ATMPVC", "X25", "INET6", "ROSE", "DECnet", "NETBEUI",
- "SECURITY", "KEY", "NETLINK", "PACKET", "ASH", "ECONET", "ATMSVC",
- "RDS", "SNA", "IRDA", "PPPOX", "WANPIPE", "LLC", "IB", "CAN", "TIPC",
- "BLUETOOTH", "IUCV", "RXRPC", "ISDN", "PHONET", "IEEE802154", "CAIF",
- "ALG", "NFC", "VSOCK",
-};
-static DEFINE_STRARRAY(socket_families);
-
static size_t syscall_arg__scnprintf_access_mode(char *bf, size_t size,
struct syscall_arg *arg)
{
@@ -645,6 +635,8 @@ static struct syscall_fmt {
[4] = { .name = "tls", .scnprintf = SCA_HEX, }, }, },
{ .name = "close",
.arg = { [0] = { .scnprintf = SCA_CLOSE_FD, /* fd */ }, }, },
+ { .name = "connect",
+ .arg = { [1] = { .scnprintf = SCA_SOCKADDR, /* servaddr */ }, }, },
{ .name = "epoll_ctl",
.arg = { [1] = STRARRAY(op, epoll_ctl_ops), }, },
{ .name = "eventfd2",
diff --git a/tools/perf/examples/bpf/augmented_syscalls.c b/tools/perf/examples/bpf/augmented_syscalls.c
index a9695c7f7aab..6dfead0be74e 100644
--- a/tools/perf/examples/bpf/augmented_syscalls.c
+++ b/tools/perf/examples/bpf/augmented_syscalls.c
@@ -19,6 +19,7 @@
*/

#include <stdio.h>
+#include <linux/socket.h>

struct bpf_map SEC("maps") __augmented_syscalls__ = {
.type = BPF_MAP_TYPE_PERF_EVENT_ARRAY,
@@ -33,7 +34,7 @@ struct augmented_filename {
char value[256];
};

-#define augmented_filename_syscall_enter(syscall) \
+#define augmented_filename_syscall_enter(syscall) \
struct augmented_enter_##syscall##_args { \
struct syscall_enter_##syscall##_args args; \
struct augmented_filename filename; \
@@ -94,4 +95,35 @@ struct syscall_enter_newstat_args {

augmented_filename_syscall_enter(newstat);

+struct sockaddr;
+
+struct syscall_enter_connect_args {
+ unsigned long long common_tp_fields;
+ long syscall_nr;
+ long fd;
+ struct sockaddr *addr_ptr;
+ unsigned long addrlen;
+};
+
+struct augmented_enter_connect_args {
+ struct syscall_enter_connect_args args;
+ struct sockaddr_storage addr;
+};
+
+int syscall_enter(connect)(struct syscall_enter_connect_args *args)
+{
+ struct augmented_enter_connect_args augmented_args;
+ unsigned long addrlen = sizeof(augmented_args.addr);
+
+ probe_read(&augmented_args.args, sizeof(augmented_args.args), args);
+#ifdef FIXME_CLANG_OPTIMIZATION_THAT_ACCESSES_USER_CONTROLLED_ADDRLEN_DESPITE_THIS_CHECK
+ if (addrlen > augmented_args.args.addrlen)
+ addrlen = augmented_args.args.addrlen;
+#endif
+ probe_read(&augmented_args.addr, addrlen, args->addr_ptr);
+ perf_event_output(args, &__augmented_syscalls__, BPF_F_CURRENT_CPU, &augmented_args,
+ sizeof(augmented_args) - sizeof(augmented_args.addr) + addrlen);
+ return 0;
+}
+
license(GPL);
diff --git a/tools/perf/trace/beauty/Build b/tools/perf/trace/beauty/Build
index f528ba35e140..c3b0afd67760 100644
--- a/tools/perf/trace/beauty/Build
+++ b/tools/perf/trace/beauty/Build
@@ -7,5 +7,6 @@ endif
libperf-y += kcmp.o
libperf-y += pkey_alloc.o
libperf-y += prctl.o
+libperf-y += sockaddr.o
libperf-y += socket.o
libperf-y += statx.o
diff --git a/tools/perf/trace/beauty/beauty.h b/tools/perf/trace/beauty/beauty.h
index 6ca044d3d851..2570152d3909 100644
--- a/tools/perf/trace/beauty/beauty.h
+++ b/tools/perf/trace/beauty/beauty.h
@@ -30,6 +30,8 @@ struct thread;

size_t pid__scnprintf_fd(struct trace *trace, pid_t pid, int fd, char *bf, size_t size);

+extern struct strarray strarray__socket_families;
+
/**
* augmented_arg: extra payload for syscall pointer arguments

@@ -135,6 +137,9 @@ size_t syscall_arg__scnprintf_prctl_arg2(char *bf, size_t size, struct syscall_a
size_t syscall_arg__scnprintf_prctl_arg3(char *bf, size_t size, struct syscall_arg *arg);
#define SCA_PRCTL_ARG3 syscall_arg__scnprintf_prctl_arg3

+size_t syscall_arg__scnprintf_sockaddr(char *bf, size_t size, struct syscall_arg *arg);
+#define SCA_SOCKADDR syscall_arg__scnprintf_sockaddr
+
size_t syscall_arg__scnprintf_socket_protocol(char *bf, size_t size, struct syscall_arg *arg);
#define SCA_SK_PROTO syscall_arg__scnprintf_socket_protocol

diff --git a/tools/perf/trace/beauty/sockaddr.c b/tools/perf/trace/beauty/sockaddr.c
new file mode 100644
index 000000000000..3944a7d54d3c
--- /dev/null
+++ b/tools/perf/trace/beauty/sockaddr.c
@@ -0,0 +1,58 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2018, Red Hat Inc, Arnaldo Carvalho de Melo <acme@redhat.com>
+
+#include "trace/beauty/beauty.h"
+#include <sys/socket.h>
+#include <sys/types.h>
+#include <sys/un.h>
+#include <arpa/inet.h>
+
+static const char *socket_families[] = {
+ "UNSPEC", "LOCAL", "INET", "AX25", "IPX", "APPLETALK", "NETROM",
+ "BRIDGE", "ATMPVC", "X25", "INET6", "ROSE", "DECnet", "NETBEUI",
+ "SECURITY", "KEY", "NETLINK", "PACKET", "ASH", "ECONET", "ATMSVC",
+ "RDS", "SNA", "IRDA", "PPPOX", "WANPIPE", "LLC", "IB", "CAN", "TIPC",
+ "BLUETOOTH", "IUCV", "RXRPC", "ISDN", "PHONET", "IEEE802154", "CAIF",
+ "ALG", "NFC", "VSOCK",
+};
+DEFINE_STRARRAY(socket_families);
+
+static size_t syscall_arg__scnprintf_augmented_sockaddr(struct syscall_arg *arg, char *bf, size_t size)
+{
+ struct sockaddr_in *sin = (struct sockaddr_in *)arg->augmented.args;
+ char family[32];
+ size_t printed;
+
+ strarray__scnprintf(&strarray__socket_families, family, sizeof(family), "%d", sin->sin_family);
+ printed = scnprintf(bf, size, "{ .family: %s", family);
+
+ if (sin->sin_family == AF_INET) {
+ char tmp[512];
+ printed += scnprintf(bf + printed, size - printed, ", port: %d, addr: %s", ntohs(sin->sin_port),
+ inet_ntop(sin->sin_family, &sin->sin_addr, tmp, sizeof(tmp)));
+ } else if (sin->sin_family == AF_INET6) {
+ struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sin;
+ u32 flowinfo = ntohl(sin6->sin6_flowinfo);
+ char tmp[512];
+
+ printed += scnprintf(bf + printed, size - printed, ", port: %d, addr: %s", ntohs(sin6->sin6_port),
+ inet_ntop(sin6->sin6_family, &sin6->sin6_addr, tmp, sizeof(tmp)));
+ if (flowinfo != 0)
+ printed += scnprintf(bf + printed, size - printed, ", flowinfo: %lu", flowinfo);
+ if (sin6->sin6_scope_id != 0)
+ printed += scnprintf(bf + printed, size - printed, ", scope_id: %lu", sin6->sin6_scope_id);
+ } else if (sin->sin_family == AF_LOCAL) {
+ struct sockaddr_un *sun = (struct sockaddr_un *)sin;
+ printed += scnprintf(bf + printed, size - printed, ", path: %s", sun->sun_path);
+ }
+
+ return printed + scnprintf(bf + printed, size - printed, " }");
+}
+
+size_t syscall_arg__scnprintf_sockaddr(char *bf, size_t size, struct syscall_arg *arg)
+{
+ if (arg->augmented.args)
+ return syscall_arg__scnprintf_augmented_sockaddr(arg, bf, size);
+
+ return scnprintf(bf, size, "%#x", arg->val);
+}
--
2.14.4
\
 
 \ /
  Last update: 2018-09-06 00:12    [W:0.254 / U:9.592 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site