tcp to bpf_perf_output

tools/old/tcpaccept.py

+#!/usr/bin/python
+# @lint-avoid-python-3-compatibility-imports
+#
+# tcpaccept Trace TCP accept()s.
+#           For Linux, uses BCC, eBPF. Embedded C.
+#
+# USAGE: tcpaccept [-h] [-t] [-p PID]
+#
+# This uses dynamic tracing of the kernel inet_csk_accept() socket function
+# (from tcp_prot.accept), and will need to be modified to match kernel changes.
+#
+# IPv4 addresses are printed as dotted quads. For IPv6 addresses, the last four
+# bytes are printed after "..."; check for future versions with better IPv6
+# support.
+#
+# Copyright (c) 2015 Brendan Gregg.
+# Licensed under the Apache License, Version 2.0 (the "License")
+#
+# 13-Oct-2015   Brendan Gregg   Created this.
+
+from __future__ import print_function
+from bcc import BPF
+import argparse
+
+# arguments
+examples = """examples:
+    ./tcpaccept           # trace all TCP accept()s
+    ./tcpaccept -t        # include timestamps
+    ./tcpaccept -p 181    # only trace PID 181
+"""
+parser = argparse.ArgumentParser(
+    description="Trace TCP accepts",
+    formatter_class=argparse.RawDescriptionHelpFormatter,
+    epilog=examples)
+parser.add_argument("-t", "--timestamp", action="store_true",
+    help="include timestamp on output")
+parser.add_argument("-p", "--pid",
+    help="trace this PID only")
+args = parser.parse_args()
+debug = 0
+
+# define BPF program
+bpf_text = """
+#include <uapi/linux/ptrace.h>
+#include <net/sock.h>
+#include <bcc/proto.h>
+
+int kretprobe__inet_csk_accept(struct pt_regs *ctx)
+{
+    struct sock *newsk = (struct sock *)ctx->ax;
+    u32 pid = bpf_get_current_pid_tgid();
+
+    if (newsk == NULL)
+        return 0;
+
+    // check this is TCP
+    u8 protocol = 0;
+    // workaround for reading the sk_protocol bitfield:
+    bpf_probe_read(&protocol, 1, (void *)((long)&newsk->sk_wmem_queued) - 3);
+    if (protocol != IPPROTO_TCP)
+        return 0;
+
+    // pull in details
+    u16 family = 0, lport = 0;
+    u32 saddr = 0, daddr = 0;
+    bpf_probe_read(&family, sizeof(family), &newsk->__sk_common.skc_family);
+    bpf_probe_read(&lport, sizeof(lport), &newsk->__sk_common.skc_num);
+    if (family == AF_INET) {
+        bpf_probe_read(&saddr, sizeof(saddr),
+            &newsk->__sk_common.skc_rcv_saddr);
+        bpf_probe_read(&daddr, sizeof(daddr),
+            &newsk->__sk_common.skc_daddr);
+
+        // output
+        bpf_trace_printk("4 %x %x %d\\n", daddr, saddr, lport);
+    } else if (family == AF_INET6) {
+        // just grab the last 4 bytes for now
+        bpf_probe_read(&saddr, sizeof(saddr),
+            &newsk->__sk_common.skc_v6_rcv_saddr.in6_u.u6_addr32[3]);
+        bpf_probe_read(&daddr, sizeof(daddr),
+            &newsk->__sk_common.skc_v6_daddr.in6_u.u6_addr32[3]);
+
+        // output and flip byte order of addresses
+        bpf_trace_printk("6 %x %x %d\\n", bpf_ntohl(daddr),
+            bpf_ntohl(saddr), lport);
+    }
+    // else drop
+
+    return 0;
+}
+"""
+
+# code substitutions
+if args.pid:
+    bpf_text = bpf_text.replace('FILTER',
+        'if (pid != %s) { return 0; }' % args.pid)
+else:
+    bpf_text = bpf_text.replace('FILTER', '')
+if debug:
+    print(bpf_text)
+
+# initialize BPF
+b = BPF(text=bpf_text)
+
+# header
+if args.timestamp:
+    print("%-9s" % ("TIME(s)"), end="")
+print("%-6s %-12s %-2s %-16s %-16s %-4s" % ("PID", "COMM", "IP", "RADDR",
+    "LADDR", "LPORT"))
+
+start_ts = 0
+
+def inet_ntoa(addr):
+    dq = ''
+    for i in range(0, 4):
+        dq = dq + str(addr & 0xff)
+        if (i != 3):
+            dq = dq + '.'
+        addr = addr >> 8
+    return dq
+
+# format output
+while 1:
+    (task, pid, cpu, flags, ts, msg) = b.trace_fields()
+    (ip_s, raddr_hs, laddr_hs, lport_s) = msg.split(" ")
+
+    if args.timestamp:
+        if start_ts == 0:
+            start_ts = ts
+        print("%-9.3f" % (ts - start_ts), end="")
+    print("%-6d %-12.12s %-2s %-16s %-16s %-4s" % (pid, task, ip_s,
+        inet_ntoa(int(raddr_hs, 16)) if ip_s == "4" else "..." + raddr_hs,
+        inet_ntoa(int(laddr_hs, 16)) if ip_s == "4" else "..." + laddr_hs,
+        lport_s))

tools/old/tcpconnect.py

+#!/usr/bin/python
+# @lint-avoid-python-3-compatibility-imports
+#
+# tcpconnect    Trace TCP connect()s.
+#               For Linux, uses BCC, eBPF. Embedded C.
+#
+# USAGE: tcpconnect [-h] [-t] [-p PID]
+#
+# All connection attempts are traced, even if they ultimately fail.
+#
+# Copyright (c) 2015 Brendan Gregg.
+# Licensed under the Apache License, Version 2.0 (the "License")
+#
+# 25-Sep-2015   Brendan Gregg   Created this.
+
+from __future__ import print_function
+from bcc import BPF
+import argparse
+
+# arguments
+examples = """examples:
+    ./tcpconnect           # trace all TCP connect()s
+    ./tcpconnect -t        # include timestamps
+    ./tcpconnect -p 181    # only trace PID 181
+"""
+parser = argparse.ArgumentParser(
+    description="Trace TCP connects",
+    formatter_class=argparse.RawDescriptionHelpFormatter,
+    epilog=examples)
+parser.add_argument("-t", "--timestamp", action="store_true",
+    help="include timestamp on output")
+parser.add_argument("-p", "--pid",
+    help="trace this PID only")
+args = parser.parse_args()
+debug = 0
+
+# define BPF program
+bpf_text = """
+#include <uapi/linux/ptrace.h>
+#include <net/sock.h>
+#include <bcc/proto.h>
+
+BPF_HASH(currsock, u32, struct sock *);
+
+int trace_connect_entry(struct pt_regs *ctx, struct sock *sk)
+{
+    u32 pid = bpf_get_current_pid_tgid();
+    FILTER
+
+    // stash the sock ptr for lookup on return
+    currsock.update(&pid, &sk);
+
+    return 0;
+};
+
+static int trace_connect_return(struct pt_regs *ctx, short ipver)
+{
+    int ret = ctx->ax;
+    u32 pid = bpf_get_current_pid_tgid();
+
+    struct sock **skpp;
+    skpp = currsock.lookup(&pid);
+    if (skpp == 0) {
+        return 0;   // missed entry
+    }
+
+    if (ret != 0) {
+        // failed to send SYNC packet, may not have populated
+        // socket __sk_common.{skc_rcv_saddr, ...}
+        currsock.delete(&pid);
+        return 0;
+    }
+
+    // pull in details
+    struct sock *skp = *skpp;
+    u32 saddr = 0, daddr = 0;
+    u16 dport = 0;
+    bpf_probe_read(&dport, sizeof(dport), &skp->__sk_common.skc_dport);
+    if (ipver == 4) {
+        bpf_probe_read(&saddr, sizeof(saddr),
+            &skp->__sk_common.skc_rcv_saddr);
+        bpf_probe_read(&daddr, sizeof(daddr),
+            &skp->__sk_common.skc_daddr);
+
+        // output
+        bpf_trace_printk("4 %x %x %d\\n", saddr, daddr, ntohs(dport));
+    } else /* 6 */ {
+        // just grab the last 4 bytes for now
+        bpf_probe_read(&saddr, sizeof(saddr),
+            &skp->__sk_common.skc_v6_rcv_saddr.in6_u.u6_addr32[3]);
+        bpf_probe_read(&daddr, sizeof(daddr),
+            &skp->__sk_common.skc_v6_daddr.in6_u.u6_addr32[3]);
+
+        // output and flip byte order of addresses
+        bpf_trace_printk("6 %x %x %d\\n", bpf_ntohl(saddr),
+            bpf_ntohl(daddr), ntohs(dport));
+    }
+
+    currsock.delete(&pid);
+
+    return 0;
+}
+
+int trace_connect_v4_return(struct pt_regs *ctx)
+{
+    return trace_connect_return(ctx, 4);
+}
+
+int trace_connect_v6_return(struct pt_regs *ctx)
+{
+    return trace_connect_return(ctx, 6);
+}
+"""
+
+# code substitutions
+if args.pid:
+    bpf_text = bpf_text.replace('FILTER',
+        'if (pid != %s) { return 0; }' % args.pid)
+else:
+    bpf_text = bpf_text.replace('FILTER', '')
+if debug:
+    print(bpf_text)
+
+# initialize BPF
+b = BPF(text=bpf_text)
+b.attach_kprobe(event="tcp_v4_connect", fn_name="trace_connect_entry")
+b.attach_kprobe(event="tcp_v6_connect", fn_name="trace_connect_entry")
+b.attach_kretprobe(event="tcp_v4_connect", fn_name="trace_connect_v4_return")
+b.attach_kretprobe(event="tcp_v6_connect", fn_name="trace_connect_v6_return")
+
+# header
+if args.timestamp:
+    print("%-9s" % ("TIME(s)"), end="")
+print("%-6s %-12s %-2s %-16s %-16s %-4s" % ("PID", "COMM", "IP", "SADDR",
+    "DADDR", "DPORT"))
+
+start_ts = 0
+
+def inet_ntoa(addr):
+    dq = ''
+    for i in range(0, 4):
+        dq = dq + str(addr & 0xff)
+        if (i != 3):
+            dq = dq + '.'
+        addr = addr >> 8
+    return dq
+
+# format output
+while 1:
+    (task, pid, cpu, flags, ts, msg) = b.trace_fields()
+    (ip_s, saddr_hs, daddr_hs, dport_s) = msg.split(" ")
+
+    if args.timestamp:
+        if start_ts == 0:
+            start_ts = ts
+        print("%-9.3f" % (ts - start_ts), end="")
+    print("%-6d %-12.12s %-2s %-16s %-16s %-4s" % (pid, task, ip_s,
+        inet_ntoa(int(saddr_hs, 16)) if ip_s == "4" else "..." + saddr_hs,
+        inet_ntoa(int(daddr_hs, 16)) if ip_s == "4" else "..." + daddr_hs,
+        dport_s))

tools/tcpaccept.py

@@ -17,10 +17,12 @@
 # Licensed under the Apache License, Version 2.0 (the "License")
 #
 # 13-Oct-2015   Brendan Gregg   Created this.
+# 14-Feb-2016      "      "     Switch to bpf_perf_output.
 
 from __future__ import print_function
 from bcc import BPF
 import argparse
+import ctypes as ct
 
 # arguments
 examples = """examples:
@@ -45,6 +47,31 @@ bpf_text = """
 #include <net/sock.h>
 #include <bcc/proto.h>
 
+// separate data structs for ipv4 and ipv6
+struct ipv4_data_t {
+    // XXX: switch some to u32's when supported
+    u64 ts_us;
+    u64 pid;
+    u64 ip;
+    u64 saddr;
+    u64 daddr;
+    u64 lport;
+    char task[TASK_COMM_LEN];
+};
+BPF_PERF_OUTPUT(ipv4_events);
+
+struct ipv6_data_t {
+    // XXX: update to transfer full ipv6 addrs
+    u64 ts_us;
+    u64 pid;
+    u64 ip;
+    u64 saddr;
+    u64 daddr;
+    u64 lport;
+    char task[TASK_COMM_LEN];
+};
+BPF_PERF_OUTPUT(ipv6_events);
+
 int kretprobe__inet_csk_accept(struct pt_regs *ctx)
 {
     struct sock *newsk = (struct sock *)ctx->ax;
@@ -62,27 +89,34 @@ int kretprobe__inet_csk_accept(struct pt_regs *ctx)
 
     // pull in details
     u16 family = 0, lport = 0;
-    u32 saddr = 0, daddr = 0;
     bpf_probe_read(&family, sizeof(family), &newsk->__sk_common.skc_family);
     bpf_probe_read(&lport, sizeof(lport), &newsk->__sk_common.skc_num);
+
     if (family == AF_INET) {
-        bpf_probe_read(&saddr, sizeof(saddr),
+        struct ipv4_data_t data4 = {.pid = pid, .ip = 4};
+        data4.ts_us = bpf_ktime_get_ns() / 1000;
+        bpf_probe_read(&data4.saddr, sizeof(u32),
             &newsk->__sk_common.skc_rcv_saddr);
-        bpf_probe_read(&daddr, sizeof(daddr),
+        bpf_probe_read(&data4.daddr, sizeof(u32),
             &newsk->__sk_common.skc_daddr);
+        data4.lport = lport;
+        bpf_get_current_comm(&data4.task, sizeof(data4.task));
+        ipv4_events.perf_submit(ctx, &data4, sizeof(data4));
 
-        // output
-        bpf_trace_printk("4 %x %x %d\\n", daddr, saddr, lport);
     } else if (family == AF_INET6) {
+        struct ipv6_data_t data6 = {.pid = pid, .ip = 6};
+        data6.ts_us = bpf_ktime_get_ns() / 1000;
         // just grab the last 4 bytes for now
+        u32 saddr = 0, daddr = 0;
         bpf_probe_read(&saddr, sizeof(saddr),
             &newsk->__sk_common.skc_v6_rcv_saddr.in6_u.u6_addr32[3]);
         bpf_probe_read(&daddr, sizeof(daddr),
             &newsk->__sk_common.skc_v6_daddr.in6_u.u6_addr32[3]);
-
-        // output and flip byte order of addresses
-        bpf_trace_printk("6 %x %x %d\\n", bpf_ntohl(daddr),
-            bpf_ntohl(saddr), lport);
+        data6.saddr = bpf_ntohl(saddr);
+        data6.daddr = bpf_ntohl(daddr);
+        data6.lport = lport;
+        bpf_get_current_comm(&data6.task, sizeof(data6.task));
+        ipv6_events.perf_submit(ctx, &data6, sizeof(data6));
     }
     // else drop
 
@@ -99,6 +133,48 @@ else:
 if debug:
     print(bpf_text)
 
+# event data
+TASK_COMM_LEN = 16      # linux/sched.h
+class Data_ipv4(ct.Structure):
+    _fields_ = [
+        ("ts_us", ct.c_ulonglong),
+        ("pid", ct.c_ulonglong),
+        ("ip", ct.c_ulonglong),
+        ("saddr", ct.c_ulonglong),
+        ("daddr", ct.c_ulonglong),
+        ("lport", ct.c_ulonglong),
+        ("task", ct.c_char * TASK_COMM_LEN)
+    ]
+class Data_ipv6(ct.Structure):
+    _fields_ = [
+        ("ts_us", ct.c_ulonglong),
+        ("pid", ct.c_ulonglong),
+        ("ip", ct.c_ulonglong),
+        ("saddr", ct.c_ulonglong),
+        ("daddr", ct.c_ulonglong),
+        ("lport", ct.c_ulonglong),
+        ("task", ct.c_char * TASK_COMM_LEN)
+    ]
+
+# process event
+def print_ipv4_event(cpu, data, size):
+    event = ct.cast(data, ct.POINTER(Data_ipv4)).contents
+    if args.timestamp:
+        if start_ts == 0:
+            start_ts = event.ts_us
+        print("%-9.3f" % ((event.ts_us - start_ts) / 100000), end="")
+    print("%-6d %-12.12s %-2d %-16s %-16s %-4d" % (event.pid, event.task,
+        event.ip, inet_ntoa(event.daddr), inet_ntoa(event.saddr),
+        event.lport))
+def print_ipv6_event(cpu, data, size):
+    event = ct.cast(data, ct.POINTER(Data_ipv6)).contents
+    if args.timestamp:
+        if start_ts == 0:
+            start_ts = event.ts_us
+        print("%-9.3f" % ((event.ts_us - start_ts) / 100000), end="")
+    print("%-6d %-12.12s %-2d ...%-13x ...%-13x %-4d" % (event.pid,
+        event.task, event.ip, event.daddr, event.saddr, event.lport))
+
 # initialize BPF
 b = BPF(text=bpf_text)
 
@@ -119,16 +195,8 @@ def inet_ntoa(addr):
         addr = addr >> 8
     return dq
 
-# format output
+# read events
+b["ipv4_events"].open_perf_buffer(print_ipv4_event)
+b["ipv6_events"].open_perf_buffer(print_ipv6_event)
 while 1:
-    (task, pid, cpu, flags, ts, msg) = b.trace_fields()
-    (ip_s, raddr_hs, laddr_hs, lport_s) = msg.split(" ")
-
-    if args.timestamp:
-        if start_ts == 0:
-            start_ts = ts
-        print("%-9.3f" % (ts - start_ts), end="")
-    print("%-6d %-12.12s %-2s %-16s %-16s %-4s" % (pid, task, ip_s,
-        inet_ntoa(int(raddr_hs, 16)) if ip_s == "4" else "..." + raddr_hs,
-        inet_ntoa(int(laddr_hs, 16)) if ip_s == "4" else "..." + laddr_hs,
-        lport_s))
+    b.kprobe_poll()

tools/tcpconnect.py

@@ -8,14 +8,23 @@
 #
 # All connection attempts are traced, even if they ultimately fail.
 #
+# This uses dynamic tracing of kernel functions, and will need to be updated
+# to match kernel changes.
+#
+# IPv4 addresses are printed as dotted quads. For IPv6 addresses, the last four
+# bytes are printed after "..."; check for future versions with better IPv6
+# support.
+#
 # Copyright (c) 2015 Brendan Gregg.
 # Licensed under the Apache License, Version 2.0 (the "License")
 #
 # 25-Sep-2015   Brendan Gregg   Created this.
+# 14-Feb-2016      "      "     Switch to bpf_perf_output.
 
 from __future__ import print_function
 from bcc import BPF
 import argparse
+import ctypes as ct
 
 # arguments
 examples = """examples:
@@ -42,6 +51,31 @@ bpf_text = """
 
 BPF_HASH(currsock, u32, struct sock *);
 
+// separate data structs for ipv4 and ipv6
+struct ipv4_data_t {
+    // XXX: switch some to u32's when supported
+    u64 ts_us;
+    u64 pid;
+    u64 ip;
+    u64 saddr;
+    u64 daddr;
+    u64 dport;
+    char task[TASK_COMM_LEN];
+};
+BPF_PERF_OUTPUT(ipv4_events);
+
+struct ipv6_data_t {
+    // XXX: update to transfer full ipv6 addrs
+    u64 ts_us;
+    u64 pid;
+    u64 ip;
+    u64 saddr;
+    u64 daddr;
+    u64 dport;
+    char task[TASK_COMM_LEN];
+};
+BPF_PERF_OUTPUT(ipv6_events);
+
 int trace_connect_entry(struct pt_regs *ctx, struct sock *sk)
 {
     u32 pid = bpf_get_current_pid_tgid();
@@ -73,27 +107,34 @@ static int trace_connect_return(struct pt_regs *ctx, short ipver)
 
     // pull in details
     struct sock *skp = *skpp;
-    u32 saddr = 0, daddr = 0;
     u16 dport = 0;
     bpf_probe_read(&dport, sizeof(dport), &skp->__sk_common.skc_dport);
+
     if (ipver == 4) {
-        bpf_probe_read(&saddr, sizeof(saddr),
+        struct ipv4_data_t data4 = {.pid = pid, .ip = ipver};
+        data4.ts_us = bpf_ktime_get_ns() / 1000;
+        bpf_probe_read(&data4.saddr, sizeof(u32),
             &skp->__sk_common.skc_rcv_saddr);
-        bpf_probe_read(&daddr, sizeof(daddr),
+        bpf_probe_read(&data4.daddr, sizeof(u32),
             &skp->__sk_common.skc_daddr);
+        data4.dport = ntohs(dport);
+        bpf_get_current_comm(&data4.task, sizeof(data4.task));
+        ipv4_events.perf_submit(ctx, &data4, sizeof(data4));
 
-        // output
-        bpf_trace_printk("4 %x %x %d\\n", saddr, daddr, ntohs(dport));
     } else /* 6 */ {
+        struct ipv6_data_t data6 = {.pid = pid, .ip = ipver};
+        data6.ts_us = bpf_ktime_get_ns() / 1000;
         // just grab the last 4 bytes for now
+        u32 saddr = 0, daddr = 0;
         bpf_probe_read(&saddr, sizeof(saddr),
             &skp->__sk_common.skc_v6_rcv_saddr.in6_u.u6_addr32[3]);
         bpf_probe_read(&daddr, sizeof(daddr),
             &skp->__sk_common.skc_v6_daddr.in6_u.u6_addr32[3]);
-
-        // output and flip byte order of addresses
-        bpf_trace_printk("6 %x %x %d\\n", bpf_ntohl(saddr),
-            bpf_ntohl(daddr), ntohs(dport));
+        data6.saddr = bpf_ntohl(saddr);
+        data6.daddr = bpf_ntohl(daddr);
+        data6.dport = ntohs(dport);
+        bpf_get_current_comm(&data6.task, sizeof(data6.task));
+        ipv6_events.perf_submit(ctx, &data6, sizeof(data6));
     }
 
     currsock.delete(&pid);
@@ -121,6 +162,48 @@ else:
 if debug:
     print(bpf_text)
 
+# event data
+TASK_COMM_LEN = 16      # linux/sched.h
+class Data_ipv4(ct.Structure):
+    _fields_ = [
+        ("ts_us", ct.c_ulonglong),
+        ("pid", ct.c_ulonglong),
+        ("ip", ct.c_ulonglong),
+        ("saddr", ct.c_ulonglong),
+        ("daddr", ct.c_ulonglong),
+        ("dport", ct.c_ulonglong),
+        ("task", ct.c_char * TASK_COMM_LEN)
+    ]
+class Data_ipv6(ct.Structure):
+    _fields_ = [
+        ("ts_us", ct.c_ulonglong),
+        ("pid", ct.c_ulonglong),
+        ("ip", ct.c_ulonglong),
+        ("saddr", ct.c_ulonglong),
+        ("daddr", ct.c_ulonglong),
+        ("dport", ct.c_ulonglong),
+        ("task", ct.c_char * TASK_COMM_LEN)
+    ]
+
+# process event
+def print_ipv4_event(cpu, data, size):
+    event = ct.cast(data, ct.POINTER(Data_ipv4)).contents
+    if args.timestamp:
+        if start_ts == 0:
+            start_ts = event.ts_us
+        print("%-9.3f" % ((event.ts_us - start_ts) / 100000), end="")
+    print("%-6d %-12.12s %-2d %-16s %-16s %-4d" % (event.pid, event.task,
+        event.ip, inet_ntoa(event.saddr), inet_ntoa(event.daddr),
+        event.dport))
+def print_ipv6_event(cpu, data, size):
+    event = ct.cast(data, ct.POINTER(Data_ipv6)).contents
+    if args.timestamp:
+        if start_ts == 0:
+            start_ts = event.ts_us
+        print("%-9.3f" % ((event.ts_us - start_ts) / 100000), end="")
+    print("%-6d %-12.12s %-2d ...%-13x ...%-13x %-4d" % (event.pid,
+        event.task, event.ip, event.saddr, event.daddr, event.dport))
+
 # initialize BPF
 b = BPF(text=bpf_text)
 b.attach_kprobe(event="tcp_v4_connect", fn_name="trace_connect_entry")
@@ -145,16 +228,8 @@ def inet_ntoa(addr):
         addr = addr >> 8
     return dq
 
-# format output
+# read events
+b["ipv4_events"].open_perf_buffer(print_ipv4_event)
+b["ipv6_events"].open_perf_buffer(print_ipv6_event)
 while 1:
-    (task, pid, cpu, flags, ts, msg) = b.trace_fields()
-    (ip_s, saddr_hs, daddr_hs, dport_s) = msg.split(" ")
-
-    if args.timestamp:
-        if start_ts == 0:
-            start_ts = ts
-        print("%-9.3f" % (ts - start_ts), end="")
-    print("%-6d %-12.12s %-2s %-16s %-16s %-4s" % (pid, task, ip_s,
-        inet_ntoa(int(saddr_hs, 16)) if ip_s == "4" else "..." + saddr_hs,
-        inet_ntoa(int(daddr_hs, 16)) if ip_s == "4" else "..." + daddr_hs,
-        dport_s))
+    b.kprobe_poll()