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[src/trunk]: src Add /d(dump) and /v(verbose) modifiers to DDB's "show mbuf" ...



details:   https://anonhg.NetBSD.org/src/rev/6b8f7a28f335
branches:  trunk
changeset: 324738:6b8f7a28f335
user:      msaitoh <msaitoh%NetBSD.org@localhost>
date:      Tue Jul 17 05:52:07 2018 +0000

description:
Add /d(dump) and /v(verbose) modifiers to DDB's "show mbuf" command. Mainly
written by Hiroki SUENAGA. Currently, /v supports Ethernet, PPP, PPPoE, ARP,
IPv4, ICMP, IPv6, ICMPv6, TCP and UDP.

diffstat:

 share/man/man4/ddb.4      |   20 +-
 sys/kern/files.kern       |    3 +-
 sys/kern/uipc_mbuf.c      |   36 +-
 sys/kern/uipc_mbufdebug.c |  959 ++++++++++++++++++++++++++++++++++++++++++++++
 sys/sys/mbuf.h            |    6 +-
 sys/sys/socket.h          |    6 +-
 6 files changed, 1017 insertions(+), 13 deletions(-)

diffs (truncated from 1152 to 300 lines):

diff -r 2681e00e29fe -r 6b8f7a28f335 share/man/man4/ddb.4
--- a/share/man/man4/ddb.4      Tue Jul 17 05:29:07 2018 +0000
+++ b/share/man/man4/ddb.4      Tue Jul 17 05:52:07 2018 +0000
@@ -1,4 +1,4 @@
-.\"    $NetBSD: ddb.4,v 1.178 2018/03/19 08:41:21 ozaki-r Exp $
+.\"    $NetBSD: ddb.4,v 1.179 2018/07/17 05:52:07 msaitoh Exp $
 .\"
 .\" Copyright (c) 1997 - 2009 The NetBSD Foundation, Inc.
 .\" All rights reserved.
@@ -56,7 +56,7 @@
 .\" any improvements or extensions that they make and grant Carnegie Mellon
 .\" the rights to redistribute these changes.
 .\"
-.Dd March 19, 2018
+.Dd July 17, 2018
 .Dt DDB 4
 .Os
 .Sh NAME
@@ -673,12 +673,20 @@
 If
 .Cm /f
 is specified, the complete vnode list is printed.
-.It Ic show mbuf Ns Oo Cm /c Oc Ar address
+.It Ic show mbuf Ns Oo Cm /cdv Oc Ar address
 Print the mbuf structure at
 .Ar address .
-If
-.Cm /c
-is specified, the mbufs in the chain are followed.
+Valid modifiers:
+.Bl -tag -width 4n -compact
+.It Cm /c
+The mbufs in the chain are followed.
+.It Cm /d
+The data is dumped.
+.It Cm /v
+Decode the mbuf chain as a packet.
+It currently supports Ethernet, PPP, PPPoE, ARP, IPv4, ICMP, IPv6, ICMP6, TCP
+and UDP.
+.El
 .It Ic show ncache Ar address
 Dump the namecache list associated with vnode at
 .Ar address .
diff -r 2681e00e29fe -r 6b8f7a28f335 sys/kern/files.kern
--- a/sys/kern/files.kern       Tue Jul 17 05:29:07 2018 +0000
+++ b/sys/kern/files.kern       Tue Jul 17 05:52:07 2018 +0000
@@ -1,4 +1,4 @@
-#      $NetBSD: files.kern,v 1.18 2018/07/12 10:46:48 maxv Exp $
+#      $NetBSD: files.kern,v 1.19 2018/07/17 05:52:07 msaitoh Exp $
 
 #
 # kernel sources
@@ -175,6 +175,7 @@
 file   kern/uipc_domain.c              kern
 file   kern/uipc_mbuf.c                kern
 file   kern/uipc_mbuf2.c               kern
+file   kern/uipc_mbufdebug.c           kern
 file   net/link_proto.c                kern    # XXX
 file   kern/uipc_proto.c               kern
 file   kern/uipc_sem.c                 kern
diff -r 2681e00e29fe -r 6b8f7a28f335 sys/kern/uipc_mbuf.c
--- a/sys/kern/uipc_mbuf.c      Tue Jul 17 05:29:07 2018 +0000
+++ b/sys/kern/uipc_mbuf.c      Tue Jul 17 05:52:07 2018 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: uipc_mbuf.c,v 1.215 2018/05/07 09:57:37 maxv Exp $     */
+/*     $NetBSD: uipc_mbuf.c,v 1.216 2018/07/17 05:52:07 msaitoh Exp $  */
 
 /*
  * Copyright (c) 1999, 2001 The NetBSD Foundation, Inc.
@@ -62,7 +62,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: uipc_mbuf.c,v 1.215 2018/05/07 09:57:37 maxv Exp $");
+__KERNEL_RCSID(0, "$NetBSD: uipc_mbuf.c,v 1.216 2018/07/17 05:52:07 msaitoh Exp $");
 
 #ifdef _KERNEL_OPT
 #include "opt_mbuftrace.h"
@@ -1646,7 +1646,11 @@
 m_print(const struct mbuf *m, const char *modif, void (*pr)(const char *, ...))
 {
        char ch;
+       const struct mbuf *m0 = NULL;
        bool opt_c = false;
+       bool opt_d = false;
+       bool opt_v = false;
+       int no = 0;
        char buf[512];
 
        while ((ch = *(modif++)) != '\0') {
@@ -1654,14 +1658,35 @@
                case 'c':
                        opt_c = true;
                        break;
+               case 'd':
+                       opt_d = true;
+                       break;
+               case 'v':
+                       opt_v = true;
+                       m0 = m;
+                       break;
                }
        }
 
 nextchain:
-       (*pr)("MBUF %p\n", m);
+       (*pr)("MBUF(%d) %p\n", no, m);
        snprintb(buf, sizeof(buf), M_FLAGS_BITS, (u_int)m->m_flags);
        (*pr)("  data=%p, len=%d, type=%d, flags=%s\n",
            m->m_data, m->m_len, m->m_type, buf);
+       if (opt_d) {
+               int i;
+               unsigned char *p = m->m_data;
+
+               (*pr)("  data:");
+
+               for (i = 0; i < m->m_len; i++) {
+                       if (i % 16 == 0)
+                               (*pr)("\n");
+                       (*pr)(" %02x", p[i]);
+               }
+
+               (*pr)("\n");
+       }
        (*pr)("  owner=%p, next=%p, nextpkt=%p\n", m->m_owner, m->m_next,
            m->m_nextpkt);
        (*pr)("  leadingspace=%u, trailingspace=%u, readonly=%u\n",
@@ -1697,9 +1722,14 @@
        if (opt_c) {
                m = m->m_next;
                if (m != NULL) {
+                       no++;
                        goto nextchain;
                }
        }
+
+       if (opt_v && m0) {
+               m_examine(m0, AF_ETHER, modif, pr);
+       }
 }
 #endif /* defined(DDB) */
 
diff -r 2681e00e29fe -r 6b8f7a28f335 sys/kern/uipc_mbufdebug.c
--- /dev/null   Thu Jan 01 00:00:00 1970 +0000
+++ b/sys/kern/uipc_mbufdebug.c Tue Jul 17 05:52:07 2018 +0000
@@ -0,0 +1,959 @@
+/*     $NetBSD: uipc_mbufdebug.c,v 1.1 2018/07/17 05:52:07 msaitoh Exp $       */
+
+/*
+ * Copyright (C) 2017 Internet Initiative Japan Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__KERNEL_RCSID(0, "$SEIL: uipc_mbufseil.c$");
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/proc.h>
+#include <sys/malloc.h>
+#include <sys/mbuf.h>
+
+#include <net/if.h>
+#include <net/if_ether.h>
+#include <net/ppp_defs.h>
+#include <net/if_arp.h>
+
+#include <netinet/in.h>
+#include <netinet/in_systm.h>
+#include <netinet/ip.h>
+#include <netinet/ip_icmp.h>
+#include <netinet/ip6.h>
+#include <netinet/icmp6.h>
+#include <netinet/if_inarp.h>
+#include <netinet/tcp.h>
+#include <netinet/udp.h>
+
+#define EXAMINE_HEX_LIMIT 128
+#define EXAMINE_HEX_COL 4
+
+/* mbuf operations without change of mbuf chain */
+static int m_peek_data(const struct mbuf *, int, int, void *);
+static unsigned int m_peek_len(const struct mbuf *, const char *);
+
+/* utility */
+static char *str_ethaddr(const uint8_t *);
+static char *str_ipaddr(const struct in_addr *);
+static char *str_ip6addr(const struct in6_addr *);
+static const char *str_ipproto(const uint8_t);
+
+/* parsers for m_examine() */
+static void m_examine_ether(const struct mbuf *, int, const char *,
+    void (*)(const char *, ...));
+static void m_examine_pppoe(const struct mbuf *, int, const char *,
+    void (*)(const char *, ...));
+static void m_examine_ppp(const struct mbuf *, int, const char *,
+    void (*)(const char *, ...));
+static void m_examine_arp(const struct mbuf *, int, const char *,
+    void (*)(const char *, ...));
+static void m_examine_ip(const struct mbuf *, int, const char *,
+    void (*)(const char *, ...));
+static void m_examine_icmp(const struct mbuf *, int, const char *,
+    void (*)(const char *, ...));
+static void m_examine_ip6(const struct mbuf *, int, const char *,
+    void (*)(const char *, ...));
+static void m_examine_icmp6(const struct mbuf *, int, const char *,
+    void (*)(const char *, ...));
+static void m_examine_tcp(const struct mbuf *, int, const char *,
+    void (*)(const char *, ...));
+static void m_examine_udp(const struct mbuf *, int, const char *,
+    void (*)(const char *, ...));
+static void m_examine_hex(const struct mbuf *, int, const char *,
+    void (*)(const char *, ...));
+
+/* header structure for some protocol */
+struct pppoehdr {
+       uint8_t vertype;
+       uint8_t code;
+       uint16_t session;
+       uint16_t plen;
+} __attribute__((__packed__));
+
+struct pppoetag {
+       uint16_t tag;
+       uint16_t len;
+} __attribute__((__packed__));
+
+#define PPPOE_TAG_EOL 0x0000
+#define PPPOE_CODE_PADI                0x09    /* Active Discovery Initiation */
+#define        PPPOE_CODE_PADO         0x07    /* Active Discovery Offer */
+#define        PPPOE_CODE_PADR         0x19    /* Active Discovery Request */
+#define        PPPOE_CODE_PADS         0x65    /* Active Discovery Session confirmation */
+#define        PPPOE_CODE_PADT         0xA7    /* Active Discovery Terminate */
+
+struct ppp_header {
+       uint8_t address;
+       uint8_t control;
+       uint16_t protocol;
+} __attribute__((__packed__));
+
+#define CISCO_MULTICAST                0x8f    /* Cisco multicast address */
+#define CISCO_UNICAST          0x0f    /* Cisco unicast address */
+#define CISCO_KEEPALIVE                0x8035  /* Cisco keepalive protocol */
+
+#ifndef NELEMS
+#define NELEMS(elem) ((sizeof(elem))/(sizeof((elem)[0])))
+#endif
+
+static int
+m_peek_data(const struct mbuf *m, int off, int len, void *vp)
+{
+       unsigned int count;
+       char *cp = vp;
+
+       if (off < 0 || len < 0)
+               return -1;
+
+       while (off > 0) {
+               if (m == 0)
+                       return -1;
+               if (off < m->m_len)
+                       break;
+               off -= m->m_len;
+               m = m->m_next;
+       }
+       while (len > 0) {
+               if (m == 0)
+                       return -1;
+               count = min(m->m_len - off, len);
+               memcpy(cp, mtod(m, char *) + off, count);
+               len -= count;
+               cp += count;
+               off = 0;
+               m = m->m_next;
+       }
+
+       return 0;
+}
+



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