perf trace augmented_syscalls: Augment connect's 'sockaddr' arg

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>

diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c
index 5d84111..ab2ed30 100644 (file)
--- 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 a9695c7..6dfead0 100644 (file)
--- 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 f528ba3..c3b0afd 100644 (file)
--- 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 6ca044d..2570152 100644 (file)
--- 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 (file)
index 0000000..3944a7d
--- /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);
+}