modules/genunix/vfs.c

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#include <mdb/mdb_modapi.h>
#include <mdb/mdb_ks.h>

#include <sys/types.h>
#include <sys/systm.h>
#include <sys/door.h>
#include <sys/file.h>
#include <sys/mount.h>
#include <sys/proc.h>
#include <sys/procfs.h>
#include <sys/proc/prdata.h>
#include <sys/stat.h>
#include <sys/vfs.h>
#include <sys/vnode.h>
#include <sys/fs/snode.h>
#include <sys/fs/fifonode.h>
#include <sys/fs/namenode.h>
#include <sys/socket.h>
#include <sys/stropts.h>
#include <sys/socketvar.h>
#include <sys/strsubr.h>
#include <sys/un.h>
#include <fs/sockfs/socktpi_impl.h>
#include <inet/ipclassifier.h>
#include <inet/ip_if.h>
#include <inet/sctp/sctp_impl.h>
#include <inet/sctp/sctp_addr.h>

int
vfs_walk_init(mdb_walk_state_t *wsp)
{
	if (wsp->walk_addr == NULL &&
	    mdb_readvar(&wsp->walk_addr, "rootvfs") == -1) {
		mdb_warn("failed to read 'rootvfs'");
		return (WALK_ERR);
	}

	wsp->walk_data = (void *)wsp->walk_addr;
	return (WALK_NEXT);
}

int
vfs_walk_step(mdb_walk_state_t *wsp)
{
	vfs_t vfs;
	int status;

	if (mdb_vread(&vfs, sizeof (vfs), wsp->walk_addr) == -1) {
		mdb_warn("failed to read vfs_t at %p", wsp->walk_addr);
		return (WALK_DONE);
	}

	status = wsp->walk_callback(wsp->walk_addr, &vfs, wsp->walk_cbdata);

	if (vfs.vfs_next == wsp->walk_data)
		return (WALK_DONE);

	wsp->walk_addr = (uintptr_t)vfs.vfs_next;

	return (status);
}

/*
 * Utility routine to read in a filesystem name given a vfs pointer.  If
 * no vfssw entry for the vfs is available (as is the case with some pseudo-
 * filesystems), we check against some known problem fs's: doorfs and
 * portfs.  If that fails, we try to guess the filesystem name using
 * symbol names.  fsname should be a buffer of size _ST_FSTYPSZ.
 */
static int
read_fsname(uintptr_t vfsp, char *fsname)
{
	vfs_t vfs;
	struct vfssw vfssw_entry;
	GElf_Sym vfssw_sym, test_sym;
	char testname[MDB_SYM_NAMLEN];

	if (mdb_vread(&vfs, sizeof (vfs), vfsp) == -1) {
		mdb_warn("failed to read vfs %p", vfsp);
		return (-1);
	}

	if (mdb_lookup_by_name("vfssw", &vfssw_sym) == -1) {
		mdb_warn("failed to find vfssw");
		return (-1);
	}

	/*
	 * vfssw is an array; we need vfssw[vfs.vfs_fstype].
	 */
	if (mdb_vread(&vfssw_entry, sizeof (vfssw_entry),
	    vfssw_sym.st_value + (sizeof (struct vfssw) * vfs.vfs_fstype))
	    == -1) {
		mdb_warn("failed to read vfssw index %d", vfs.vfs_fstype);
		return (-1);
	}

	if (vfs.vfs_fstype != 0) {
		if (mdb_readstr(fsname, _ST_FSTYPSZ,
		    (uintptr_t)vfssw_entry.vsw_name) == -1) {
			mdb_warn("failed to find fs name %p",
			    vfssw_entry.vsw_name);
			return (-1);
		}
		return (0);
	}

	/*
	 * Do precise detection for certain filesystem types that we
	 * know do not appear in vfssw[], and that we depend upon in other
	 * parts of the code: doorfs and portfs.
	 */
	if (mdb_lookup_by_name("door_vfs", &test_sym) != -1) {
		if (test_sym.st_value == vfsp) {
			strcpy(fsname, "doorfs");
			return (0);
		}
	}
	if (mdb_lookup_by_name("port_vfs", &test_sym) != -1) {
		if (test_sym.st_value == vfsp) {
			strcpy(fsname, "portfs");
			return (0);
		}
	}

	/*
	 * Heuristic detection for other filesystems that don't have a
	 * vfssw[] entry.  These tend to be named <fsname>_vfs, so we do a
	 * lookup_by_addr and see if we find a symbol of that name.
	 */
	if (mdb_lookup_by_addr(vfsp, MDB_SYM_EXACT, testname, sizeof (testname),
	    &test_sym) != -1) {
		if ((strlen(testname) > 4) &&
		    (strcmp(testname + strlen(testname) - 4, "_vfs") == 0)) {
			testname[strlen(testname) - 4] = '\0';
			strncpy(fsname, testname, _ST_FSTYPSZ);
			return (0);
		}
	}

	mdb_warn("unknown filesystem type for vfs %p", vfsp);
	return (-1);
}

/*
 * Column widths for mount point display in ::fsinfo output.
 */
#ifdef _LP64
#define	FSINFO_MNTLEN	48
#else
#define	FSINFO_MNTLEN	56
#endif

/* ARGSUSED */
int
fsinfo(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv)
{
	vfs_t vfs;
	int len;
	int opt_v = 0;
	char buf[MAXPATHLEN];
	char fsname[_ST_FSTYPSZ];
	mntopt_t *mntopts;
	size_t size;
	int i;
	int first = 1;
	char opt[MAX_MNTOPT_STR];
	uintptr_t global_zone;

	if (!(flags & DCMD_ADDRSPEC)) {
		if (mdb_walk_dcmd("vfs", "fsinfo", argc, argv) == -1) {
			mdb_warn("failed to walk file system list");
			return (DCMD_ERR);
		}
		return (DCMD_OK);
	}

	if (mdb_getopts(argc, argv,
	    'v', MDB_OPT_SETBITS, TRUE, &opt_v, NULL) != argc)
		return (DCMD_USAGE);

	if (DCMD_HDRSPEC(flags))
		mdb_printf("%<u>%?s %-15s %s%</u>\n",
		    "VFSP", "FS", "MOUNT");

	if (mdb_vread(&vfs, sizeof (vfs), addr) == -1) {
		mdb_warn("failed to read vfs_t %p", addr);
		return (DCMD_ERR);
	}

	if ((len = mdb_read_refstr((uintptr_t)vfs.vfs_mntpt, buf,
	    sizeof (buf))) <= 0)
		strcpy(buf, "??");

	else if (!opt_v && (len >= FSINFO_MNTLEN))
		/*
		 * In normal mode, we truncate the path to keep the output
		 * clean.  In -v mode, we just print the full path.
		 */
		strcpy(&buf[FSINFO_MNTLEN - 4], "...");

	if (read_fsname(addr, fsname) == -1)
		return (DCMD_ERR);

	mdb_printf("%0?p %-15s %s\n", addr, fsname, buf);

	if (!opt_v)
		return (DCMD_OK);

	/*
	 * Print 'resource' string; this shows what we're mounted upon.
	 */
	if (mdb_read_refstr((uintptr_t)vfs.vfs_resource, buf,
	    MAXPATHLEN) <= 0)
		strcpy(buf, "??");

	mdb_printf("%?s %s\n", "R:", buf);

	/*
	 * Print mount options array; it sucks to be a mimic, but we copy
	 * the same logic as in mntvnops.c for adding zone= tags, and we
	 * don't bother with the obsolete dev= option.
	 */
	size = vfs.vfs_mntopts.mo_count * sizeof (mntopt_t);
	mntopts = mdb_alloc(size, UM_SLEEP | UM_GC);

	if (mdb_vread(mntopts, size,
	    (uintptr_t)vfs.vfs_mntopts.mo_list) == -1) {
		mdb_warn("failed to read mntopts %p", vfs.vfs_mntopts.mo_list);
		return (DCMD_ERR);
	}

	for (i = 0; i < vfs.vfs_mntopts.mo_count; i++) {
		if (mntopts[i].mo_flags & MO_SET) {
			if (mdb_readstr(opt, sizeof (opt),
			    (uintptr_t)mntopts[i].mo_name) == -1) {
				mdb_warn("failed to read mntopt name %p",
				    mntopts[i].mo_name);
				return (DCMD_ERR);
			}
			if (first) {
				mdb_printf("%?s ", "O:");
				first = 0;
			} else {
				mdb_printf(",");
			}
			mdb_printf("%s", opt);
			if (mntopts[i].mo_flags & MO_HASVALUE) {
				if (mdb_readstr(opt, sizeof (opt),
				    (uintptr_t)mntopts[i].mo_arg) == -1) {
					mdb_warn("failed to read mntopt "
					    "value %p", mntopts[i].mo_arg);
					return (DCMD_ERR);
				}
				mdb_printf("=%s", opt);
			}
		}
	}

	if (mdb_readvar(&global_zone, "global_zone") == -1) {
		mdb_warn("failed to locate global_zone");
		return (DCMD_ERR);
	}

	if ((vfs.vfs_zone != NULL) &&
	    ((uintptr_t)vfs.vfs_zone != global_zone)) {
		zone_t z;

		if (mdb_vread(&z, sizeof (z), (uintptr_t)vfs.vfs_zone) == -1) {
			mdb_warn("failed to read zone");
			return (DCMD_ERR);
		}
		/*
		 * zone names are much shorter than MAX_MNTOPT_STR
		 */
		if (mdb_readstr(opt, sizeof (opt),
		    (uintptr_t)z.zone_name) == -1) {
			mdb_warn("failed to read zone name");
			return (DCMD_ERR);
		}
		if (first) {
			mdb_printf("%?s ", "O:");
		} else {
			mdb_printf(",");
		}
		mdb_printf("zone=%s", opt);
	}
	return (DCMD_OK);
}


#define	REALVP_DONE	0
#define	REALVP_ERR	1
#define	REALVP_CONTINUE	2

static int
next_realvp(uintptr_t invp, struct vnode *outvn, uintptr_t *outvp)
{
	char fsname[_ST_FSTYPSZ];

	*outvp = invp;
	if (mdb_vread(outvn, sizeof (struct vnode), invp) == -1) {
		mdb_warn("failed to read vnode at %p", invp);
		return (REALVP_ERR);
	}

	if (read_fsname((uintptr_t)outvn->v_vfsp, fsname) == -1)
		return (REALVP_ERR);

	/*
	 * We know how to do 'realvp' for as many filesystems as possible;
	 * for all other filesystems, we assume that the vp we are given
	 * is the realvp.  In the kernel, a realvp operation will sometimes
	 * dig through multiple layers.  Here, we only fetch the pointer
	 * to the next layer down.  This allows dcmds to print out the
	 * various layers.
	 */
	if (strcmp(fsname, "fifofs") == 0) {
		fifonode_t fn;
		if (mdb_vread(&fn, sizeof (fn),
		    (uintptr_t)outvn->v_data) == -1) {
			mdb_warn("failed to read fifonode");
			return (REALVP_ERR);
		}
		*outvp = (uintptr_t)fn.fn_realvp;

	} else if (strcmp(fsname, "namefs") == 0) {
		struct namenode nn;
		if (mdb_vread(&nn, sizeof (nn),
		    (uintptr_t)outvn->v_data) == -1) {
			mdb_warn("failed to read namenode");
			return (REALVP_ERR);
		}
		*outvp = (uintptr_t)nn.nm_filevp;

	} else if (outvn->v_type == VSOCK && outvn->v_stream != NULL) {
		struct stdata stream;

		/*
		 * Sockets have a strange and different layering scheme; we
		 * hop over into the sockfs vnode (accessible via the stream
		 * head) if possible.
		 */
		if (mdb_vread(&stream, sizeof (stream),
		    (uintptr_t)outvn->v_stream) == -1) {
			mdb_warn("failed to read stream data");
			return (REALVP_ERR);
		}
		*outvp = (uintptr_t)stream.sd_vnode;
	}

	if (*outvp == invp || *outvp == NULL)
		return (REALVP_DONE);

	return (REALVP_CONTINUE);
}

static void
pfiles_print_addr(struct sockaddr *addr)
{
	struct sockaddr_in *s_in;
	struct sockaddr_un *s_un;
	struct sockaddr_in6 *s_in6;
	in_port_t port;

	switch (addr->sa_family) {
	case AF_INET:
		/* LINTED: alignment */
		s_in = (struct sockaddr_in *)addr;
		mdb_nhconvert(&port, &s_in->sin_port, sizeof (port));
		mdb_printf("AF_INET %I %d ", s_in->sin_addr.s_addr, port);
		break;

	case AF_INET6:
		/* LINTED: alignment */
		s_in6 = (struct sockaddr_in6 *)addr;
		mdb_nhconvert(&port, &s_in6->sin6_port, sizeof (port));
		mdb_printf("AF_INET6 %N %d ", &(s_in6->sin6_addr), port);
		break;

	case AF_UNIX:
		s_un = (struct sockaddr_un *)addr;
		mdb_printf("AF_UNIX %s ", s_un->sun_path);
		break;
	default:
		mdb_printf("AF_?? (%d) ", addr->sa_family);
		break;
	}
}

static int
pfiles_get_sonode(vnode_t *v_sock, struct sonode *sonode)
{
	if (mdb_vread(sonode, sizeof (struct sonode),
	    (uintptr_t)v_sock->v_data) == -1) {
		mdb_warn("failed to read sonode");
		return (-1);
	}

	return (0);
}

static int
pfiles_get_tpi_sonode(vnode_t *v_sock, sotpi_sonode_t *sotpi_sonode)
{

	struct stdata stream;

	if (mdb_vread(&stream, sizeof (stream),
	    (uintptr_t)v_sock->v_stream) == -1) {
		mdb_warn("failed to read stream data");
		return (-1);
	}

	if (mdb_vread(v_sock, sizeof (vnode_t),
	    (uintptr_t)stream.sd_vnode) == -1) {
		mdb_warn("failed to read stream vnode");
		return (-1);
	}

	if (mdb_vread(sotpi_sonode, sizeof (sotpi_sonode_t),
	    (uintptr_t)v_sock->v_data) == -1) {
		mdb_warn("failed to read sotpi_sonode");
		return (-1);
	}

	return (0);
}

/*
 * Do some digging to get a reasonable pathname for this vnode. 'path'
 * should point at a buffer of MAXPATHLEN in size.
 */
static int
pfiles_dig_pathname(uintptr_t vp, char *path)
{
	vnode_t v;

	bzero(path, MAXPATHLEN);

	if (mdb_vread(&v, sizeof (v), vp) == -1) {
		mdb_warn("failed to read vnode");
		return (-1);
	}

	if (v.v_path == NULL) {
		/*
		 * fifo's and doors are special.   Some have pathnames, and
		 * some do not.  And for these, it is pointless to go off to
		 * mdb_vnode2path, which is very slow.
		 *
		 * Event ports never have a pathname.
		 */
		if (v.v_type == VFIFO || v.v_type == VDOOR || v.v_type == VPORT)
			return (0);

		/*
		 * For sockets, we won't find a path unless we print the path
		 * associated with transport's STREAM device.
		 */
		if (v.v_type == VSOCK) {
			struct sonode sonode;

			if (pfiles_get_sonode(&v, &sonode) == -1) {
				return (-1);
			}
			if (!SOCK_IS_NONSTR(&sonode)) {
				struct sockparams *sp = sonode.so_sockparams;
				vp = (uintptr_t)sp->sp_sdev_info.sd_vnode;
			} else {
				vp = NULL;
			}
		}
	}


	/*
	 * mdb_vnode2path will print an error for us as needed, but not
	 * finding a pathname is not really an error, so we plow on.
	 */
	(void) mdb_vnode2path(vp, path, MAXPATHLEN);

	/*
	 * A common problem is that device pathnames are prefixed with
	 * /dev/../devices/.  We just clean those up slightly:
	 * 	/dev/../devices/<mumble> --> /devices/<mumble>
	 * 	/dev/pts/../../devices/<mumble> --> /devices/<mumble>
	 */
	if (strncmp("/dev/../devices/", path, strlen("/dev/../devices/")) == 0)
		strcpy(path, path + 7);

	if (strncmp("/dev/pts/../../devices/", path,
	    strlen("/dev/pts/../../devices/")) == 0)
		strcpy(path, path + 14);

	return (0);
}

const struct fs_type {
	int type;
	const char *name;
} fs_types[] = {
	{ VNON,   "NON" },
	{ VREG,   "REG" },
	{ VDIR,   "DIR" },
	{ VBLK,   "BLK" },
	{ VCHR,   "CHR" },
	{ VLNK,   "LNK" },
	{ VFIFO,  "FIFO" },
	{ VDOOR,  "DOOR" },
	{ VPROC,  "PROC" },
	{ VSOCK,  "SOCK" },
	{ VPORT,  "PORT" },
	{ VBAD,   "BAD" }
};

#define	NUM_FS_TYPES (sizeof (fs_types) / sizeof (struct fs_type))

struct pfiles_cbdata {
	int opt_p;
	int fd;
};

#define	list_d2l(a, obj) ((list_node_t *)(((char *)obj) + (a)->list_offset))
#define	list_object(a, node) ((void *)(((char *)node) - (a)->list_offset))

/*
 * SCTP interface for geting the first source address of a sctp_t.
 */
int
sctp_getsockaddr(sctp_t *sctp, struct sockaddr *addr)
{
	int			err = -1;
	int			i;
	int			l;
	sctp_saddr_ipif_t	*pobj;
	sctp_saddr_ipif_t	obj;
	size_t			added = 0;
	sin6_t			*sin6;
	sin_t			*sin4;
	int			scanned = 0;
	boolean_t		skip_lback = B_FALSE;

	addr->sa_family = sctp->sctp_family;
	if (sctp->sctp_nsaddrs == 0)
		goto done;

	/*
	 * Skip loopback addresses for non-loopback assoc.
	 */
	if (sctp->sctp_state >= SCTPS_ESTABLISHED && !sctp->sctp_loopback) {
		skip_lback = B_TRUE;
	}

	for (i = 0; i < SCTP_IPIF_HASH; i++) {
		if (sctp->sctp_saddrs[i].ipif_count == 0)
			continue;

		pobj = list_object(&sctp->sctp_saddrs[i].sctp_ipif_list,
		    sctp->sctp_saddrs[i].sctp_ipif_list.list_head.list_next);
		if (mdb_vread(&obj, sizeof (sctp_saddr_ipif_t),
		    (uintptr_t)pobj) == -1) {
			mdb_warn("failed to read sctp_saddr_ipif_t");
			return (err);
		}

		for (l = 0; l < sctp->sctp_saddrs[i].ipif_count; l++) {
			sctp_ipif_t	ipif;
			in6_addr_t	laddr;
			list_node_t 	*pnode;
			list_node_t	node;

			if (mdb_vread(&ipif, sizeof (sctp_ipif_t),
			    (uintptr_t)obj.saddr_ipifp) == -1) {
				mdb_warn("failed to read sctp_ipif_t");
				return (err);
			}
			laddr = ipif.sctp_ipif_saddr;

			scanned++;
			if ((ipif.sctp_ipif_state == SCTP_IPIFS_CONDEMNED) ||
			    SCTP_DONT_SRC(&obj) ||
			    (ipif.sctp_ipif_ill->sctp_ill_flags &
			    PHYI_LOOPBACK) && skip_lback) {
				if (scanned >= sctp->sctp_nsaddrs)
					goto done;

				/* LINTED: alignment */
				pnode = list_d2l(&sctp->sctp_saddrs[i].
				    sctp_ipif_list, pobj);
				if (mdb_vread(&node, sizeof (list_node_t),
				    (uintptr_t)pnode) == -1) {
					mdb_warn("failed to read list_node_t");
					return (err);
				}
				pobj = list_object(&sctp->sctp_saddrs[i].
				    sctp_ipif_list, node.list_next);
				if (mdb_vread(&obj, sizeof (sctp_saddr_ipif_t),
				    (uintptr_t)pobj) == -1) {
					mdb_warn("failed to read "
					    "sctp_saddr_ipif_t");
					return (err);
				}
				continue;
			}

			switch (sctp->sctp_family) {
			case AF_INET:
				/* LINTED: alignment */
				sin4 = (sin_t *)addr;
				if ((sctp->sctp_state <= SCTPS_LISTEN) &&
				    sctp->sctp_bound_to_all) {
					sin4->sin_addr.s_addr = INADDR_ANY;
					sin4->sin_port = sctp->sctp_lport;
				} else {
					sin4 += added;
					sin4->sin_family = AF_INET;
					sin4->sin_port = sctp->sctp_lport;
					IN6_V4MAPPED_TO_INADDR(&laddr,
					    &sin4->sin_addr);
				}
				break;

			case AF_INET6:
				/* LINTED: alignment */
				sin6 = (sin6_t *)addr;
				if ((sctp->sctp_state <= SCTPS_LISTEN) &&
				    sctp->sctp_bound_to_all) {
					bzero(&sin6->sin6_addr,
					    sizeof (sin6->sin6_addr));
					sin6->sin6_port = sctp->sctp_lport;
				} else {
					sin6 += added;
					sin6->sin6_family = AF_INET6;
					sin6->sin6_port = sctp->sctp_lport;
					sin6->sin6_addr = laddr;
				}
				sin6->sin6_flowinfo = sctp->sctp_ip6h->ip6_vcf &
				    ~IPV6_VERS_AND_FLOW_MASK;
				sin6->sin6_scope_id = 0;
				sin6->__sin6_src_id = 0;
				break;
			}
			added++;
			if (added >= 1) {
				err = 0;
				goto done;
			}
			if (scanned >= sctp->sctp_nsaddrs)
				goto done;

			/* LINTED: alignment */
			pnode = list_d2l(&sctp->sctp_saddrs[i].sctp_ipif_list,
			    pobj);
			if (mdb_vread(&node, sizeof (list_node_t),
			    (uintptr_t)pnode) == -1) {
				mdb_warn("failed to read list_node_t");
				return (err);
			}
			pobj = list_object(&sctp->sctp_saddrs[i].
			    sctp_ipif_list, node.list_next);
			if (mdb_vread(&obj, sizeof (sctp_saddr_ipif_t),
			    (uintptr_t)pobj) == -1) {
				mdb_warn("failed to read sctp_saddr_ipif_t");
				return (err);
			}
		}
	}
done:
	return (err);
}

/*
 * SCTP interface for geting the primary peer address of a sctp_t.
 */
static int
sctp_getpeeraddr(sctp_t *sctp, struct sockaddr *addr)
{
	struct sockaddr_in	*sin4;
	struct sockaddr_in6	*sin6;
	sctp_faddr_t		sctp_primary;
	in6_addr_t		faddr;

	if (sctp->sctp_faddrs == NULL)
		return (-1);

	addr->sa_family = sctp->sctp_family;
	if (mdb_vread(&sctp_primary, sizeof (sctp_faddr_t),
	    (uintptr_t)sctp->sctp_primary) == -1) {
		mdb_warn("failed to read sctp primary faddr");
		return (-1);
	}
	faddr = sctp_primary.faddr;

	switch (sctp->sctp_family) {
	case AF_INET:
		/* LINTED: alignment */
		sin4 = (struct sockaddr_in *)addr;
		IN6_V4MAPPED_TO_INADDR(&faddr, &sin4->sin_addr);
		sin4->sin_port = sctp->sctp_fport;
		sin4->sin_family = AF_INET;
		break;

	case AF_INET6:
		/* LINTED: alignment */
		sin6 = (struct sockaddr_in6 *)addr;
		sin6->sin6_addr = faddr;
		sin6->sin6_port = sctp->sctp_fport;
		sin6->sin6_family = AF_INET6;
		sin6->sin6_flowinfo = 0;
		sin6->sin6_scope_id = 0;
		sin6->__sin6_src_id = 0;
		break;
	}

	return (0);
}

static int
tpi_sock_print(sotpi_sonode_t *sotpi_sonode)
{
	if (sotpi_sonode->st_info.sti_laddr_valid == 1) {
		struct sockaddr *laddr =
		    mdb_alloc(sotpi_sonode->st_info.sti_laddr_len, UM_SLEEP);
		if (mdb_vread(laddr, sotpi_sonode->st_info.sti_laddr_len,
		    (uintptr_t)sotpi_sonode->st_info.sti_laddr_sa) == -1) {
			mdb_warn("failed to read sotpi_sonode socket addr");
			return (-1);
		}

		mdb_printf("socket: ");
		pfiles_print_addr(laddr);
	}

	if (sotpi_sonode->st_info.sti_faddr_valid == 1) {
		struct sockaddr *faddr =
		    mdb_alloc(sotpi_sonode->st_info.sti_faddr_len, UM_SLEEP);
		if (mdb_vread(faddr, sotpi_sonode->st_info.sti_faddr_len,
		    (uintptr_t)sotpi_sonode->st_info.sti_faddr_sa) == -1) {
			mdb_warn("failed to read sotpi_sonode remote addr");
			return (-1);
		}

		mdb_printf("remote: ");
		pfiles_print_addr(faddr);
	}

	return (0);
}

static int
tcpip_sock_print(struct sonode *socknode)
{
	switch (socknode->so_family) {
	case AF_INET:
	{
		conn_t conn_t;
		in_port_t port;

		if (mdb_vread(&conn_t, sizeof (conn_t),
		    (uintptr_t)socknode->so_proto_handle) == -1) {
			mdb_warn("failed to read conn_t V4");
			return (-1);
		}

		mdb_printf("socket: ");
		mdb_nhconvert(&port, &conn_t.conn_lport, sizeof (port));
		mdb_printf("AF_INET %I %d ", conn_t.conn_src, port);

		/*
		 * If this is a listening socket, we don't print
		 * the remote address.
		 */
		if (IPCL_IS_TCP(&conn_t) && IPCL_IS_BOUND(&conn_t) == 0 ||
		    IPCL_IS_UDP(&conn_t) && IPCL_IS_CONNECTED(&conn_t)) {
			mdb_printf("remote: ");
			mdb_nhconvert(&port, &conn_t.conn_fport, sizeof (port));
			mdb_printf("AF_INET %I %d ", conn_t.conn_rem, port);
		}

		break;
	}

	case AF_INET6:
	{
		conn_t conn_t;
		in_port_t port;

		if (mdb_vread(&conn_t, sizeof (conn_t),
		    (uintptr_t)socknode->so_proto_handle) == -1) {
			mdb_warn("failed to read conn_t V6");
			return (-1);
		}

		mdb_printf("socket: ");
		mdb_nhconvert(&port, &conn_t.conn_lport, sizeof (port));
		mdb_printf("AF_INET6 %N %d ", &conn_t.conn_srcv6, port);

		/*
		 * If this is a listening socket, we don't print
		 * the remote address.
		 */
		if (IPCL_IS_TCP(&conn_t) && IPCL_IS_BOUND(&conn_t) == 0 ||
		    IPCL_IS_UDP(&conn_t) && IPCL_IS_CONNECTED(&conn_t)) {
			mdb_printf("remote: ");
			mdb_nhconvert(&port, &conn_t.conn_fport, sizeof (port));
			mdb_printf("AF_INET6 %N %d ", &conn_t.conn_remv6, port);
		}

		break;
	}

	default:
		mdb_printf("AF_?? (%d)", socknode->so_family);
		break;
	}

	return (0);
}

static int
sctp_sock_print(struct sonode *socknode)
{
	sctp_t sctp_t;

	struct sockaddr *laddr = mdb_alloc(sizeof (struct sockaddr), UM_SLEEP);
	struct sockaddr *faddr = mdb_alloc(sizeof (struct sockaddr), UM_SLEEP);

	if (mdb_vread(&sctp_t, sizeof (sctp_t),
	    (uintptr_t)socknode->so_proto_handle) == -1) {
		mdb_warn("failed to read sctp_t");
		return (-1);
	}

	if (sctp_getsockaddr(&sctp_t, laddr) == 0) {
		mdb_printf("socket:");
		pfiles_print_addr(laddr);
	}
	if (sctp_getpeeraddr(&sctp_t, faddr) == 0) {
		mdb_printf("remote:");
		pfiles_print_addr(faddr);
	}

	return (0);
}

/* ARGSUSED */
static int
sdp_sock_print(struct sonode *socknode)
{
	return (0);
}

struct sock_print {
	int	family;
	int	type;
	int	pro;
	int	(*print)(struct sonode *socknode);
} sock_prints[] = {
	{ 2,	2,	0,	tcpip_sock_print },	/* /dev/tcp	*/
	{ 2,	2,	6,	tcpip_sock_print },	/* /dev/tcp	*/
	{ 26,	2,	0,	tcpip_sock_print },	/* /dev/tcp6	*/
	{ 26,	2,	6,	tcpip_sock_print },	/* /dev/tcp6	*/
	{ 2,	1,	0,	tcpip_sock_print },	/* /dev/udp	*/
	{ 2,	1,	17,	tcpip_sock_print },	/* /dev/udp	*/
	{ 26,	1,	0,	tcpip_sock_print },	/* /dev/udp6	*/
	{ 26,	1,	17,	tcpip_sock_print },	/* /dev/udp6	*/
	{ 2,	4,	0,	tcpip_sock_print },	/* /dev/rawip	*/
	{ 26,	4,	0,	tcpip_sock_print },	/* /dev/rawip6	*/
	{ 2,	2,	132,	sctp_sock_print },	/* /dev/sctp	*/
	{ 26,	2,	132,	sctp_sock_print },	/* /dev/sctp6	*/
	{ 2,	6,	132,	sctp_sock_print },	/* /dev/sctp	*/
	{ 26,	6,	132,	sctp_sock_print },	/* /dev/sctp6	*/
	{ 24,	4,	0,	tcpip_sock_print },	/* /dev/rts	*/
	{ 2,	2,	257,	sdp_sock_print },	/* /dev/sdp	*/
	{ 26,	2,	257,	sdp_sock_print },	/* /dev/sdp	*/
};

#define	NUM_SOCK_PRINTS                                         \
	(sizeof (sock_prints) / sizeof (struct sock_print))

static int
pfile_callback(uintptr_t addr, const struct file *f, struct pfiles_cbdata *cb)
{
	vnode_t v, layer_vn;
	int myfd = cb->fd;
	const char *type;
	char path[MAXPATHLEN];
	uintptr_t top_vnodep, realvpp;
	char fsname[_ST_FSTYPSZ];
	int err, i;

	cb->fd++;

	if (addr == NULL) {
		return (WALK_NEXT);
	}

	top_vnodep = realvpp = (uintptr_t)f->f_vnode;

	if (mdb_vread(&v, sizeof (v), realvpp) == -1) {
		mdb_warn("failed to read vnode");
		return (DCMD_ERR);
	}

	type = "?";
	for (i = 0; i <= NUM_FS_TYPES; i++) {
		if (fs_types[i].type == v.v_type)
			type = fs_types[i].name;
	}

	do {
		uintptr_t next_realvpp;

		err = next_realvp(realvpp, &layer_vn, &next_realvpp);
		if (next_realvpp != NULL)
			realvpp = next_realvpp;

	} while (err == REALVP_CONTINUE);

	if (err == REALVP_ERR) {
		mdb_warn("failed to do realvp() for %p", realvpp);
		return (DCMD_ERR);
	}

	if (read_fsname((uintptr_t)layer_vn.v_vfsp, fsname) == -1)
		return (DCMD_ERR);

	mdb_printf("%4d %4s %?0p ", myfd, type, top_vnodep);

	if (cb->opt_p) {
		if (pfiles_dig_pathname(top_vnodep, path) == -1)
			return (DCMD_ERR);

		mdb_printf("%s\n", path);
		return (DCMD_OK);
	}

	/*
	 * Sockets generally don't have interesting pathnames; we only
	 * show those in the '-p' view.
	 */
	path[0] = '\0';
	if (v.v_type != VSOCK) {
		if (pfiles_dig_pathname(top_vnodep, path) == -1)
			return (DCMD_ERR);
	}
	mdb_printf("%s%s", path, path[0] == '\0' ? "" : " ");

	switch (v.v_type) {
	case VDOOR:
	{
		door_node_t doornode;
		proc_t pr;

		if (mdb_vread(&doornode, sizeof (doornode),
		    (uintptr_t)layer_vn.v_data) == -1) {
			mdb_warn("failed to read door_node");
			return (DCMD_ERR);
		}

		if (mdb_vread(&pr, sizeof (pr),
		    (uintptr_t)doornode.door_target) == -1) {
			mdb_warn("failed to read door server process %p",
			    doornode.door_target);
			return (DCMD_ERR);
		}
		mdb_printf("[door to '%s' (proc=%p)]", pr.p_user.u_comm,
		    doornode.door_target);
		break;
	}

	case VSOCK:
	{
		vnode_t v_sock;
		struct sonode so;

		if (mdb_vread(&v_sock, sizeof (v_sock), realvpp) == -1) {
			mdb_warn("failed to read socket vnode");
			return (DCMD_ERR);
		}

		/*
		 * Sockets can be non-stream or stream, they have to be dealed
		 * with differently.
		 */
		if (v_sock.v_stream == NULL) {
			if (pfiles_get_sonode(&v_sock, &so) == -1)
				return (DCMD_ERR);

			/* Pick the proper methods. */
			for (i = 0; i <= NUM_SOCK_PRINTS; i++) {
				if ((sock_prints[i].family == so.so_family &&
				    sock_prints[i].type == so.so_type &&
				    sock_prints[i].pro == so.so_protocol) ||
				    (sock_prints[i].family == so.so_family &&
				    sock_prints[i].type == so.so_type &&
				    so.so_type == SOCK_RAW)) {
					if ((*sock_prints[i].print)(&so) == -1)
						return (DCMD_ERR);
				}
			}
		} else {
			sotpi_sonode_t sotpi_sonode;

			if (pfiles_get_sonode(&v_sock, &so) == -1)
				return (DCMD_ERR);

			/*
			 * If the socket is a fallback socket, read its related
			 * information separately; otherwise, read it as a whole
			 * tpi socket.
			 */
			if (so.so_state & SS_FALLBACK_COMP) {
				sotpi_sonode.st_sonode = so;

				if (mdb_vread(&(sotpi_sonode.st_info),
				    sizeof (sotpi_info_t),
				    (uintptr_t)so.so_priv) == -1)
					return (DCMD_ERR);
			} else {
				if (pfiles_get_tpi_sonode(&v_sock,
				    &sotpi_sonode) == -1)
					return (DCMD_ERR);
			}

			if (tpi_sock_print(&sotpi_sonode) == -1)
				return (DCMD_ERR);
		}

		break;
	}

	case VPORT:
		mdb_printf("[event port (port=%p)]", v.v_data);
		break;

	case VPROC:
	{
		prnode_t prnode;
		prcommon_t prcommon;

		if (mdb_vread(&prnode, sizeof (prnode),
		    (uintptr_t)layer_vn.v_data) == -1) {
			mdb_warn("failed to read prnode");
			return (DCMD_ERR);
		}

		if (mdb_vread(&prcommon, sizeof (prcommon),
		    (uintptr_t)prnode.pr_common) == -1) {
			mdb_warn("failed to read prcommon %p",
			    prnode.pr_common);
			return (DCMD_ERR);
		}

		mdb_printf("(proc=%p)", prcommon.prc_proc);
		break;
	}

	default:
		break;
	}

	mdb_printf("\n");

	return (WALK_NEXT);
}

static int
file_t_callback(uintptr_t addr, const struct file *f, struct pfiles_cbdata *cb)
{
	int myfd = cb->fd;

	cb->fd++;

	if (addr == NULL) {
		return (WALK_NEXT);
	}

	/*
	 * We really need 20 digits to print a 64-bit offset_t, but this
	 * is exceedingly rare, so we cheat and assume a column width of 10
	 * digits, in order to fit everything cleanly into 80 columns.
	 */
	mdb_printf("%?0p %4d %8x %?0p %10lld %?0p %4d\n",
	    addr, myfd, f->f_flag, f->f_vnode, f->f_offset, f->f_cred,
	    f->f_count);

	return (WALK_NEXT);
}

int
pfiles(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv)
{
	int opt_f = 0;

	struct pfiles_cbdata cb;

	bzero(&cb, sizeof (cb));

	if (!(flags & DCMD_ADDRSPEC))
		return (DCMD_USAGE);

	if (mdb_getopts(argc, argv,
	    'p', MDB_OPT_SETBITS, TRUE, &cb.opt_p,
	    'f', MDB_OPT_SETBITS, TRUE, &opt_f, NULL) != argc)
		return (DCMD_USAGE);

	if (opt_f) {
		mdb_printf("%<u>%?s %4s %8s %?s %10s %?s %4s%</u>\n", "FILE",
		    "FD", "FLAG", "VNODE", "OFFSET", "CRED", "CNT");
		if (mdb_pwalk("allfile", (mdb_walk_cb_t)file_t_callback, &cb,
		    addr) == -1) {
			mdb_warn("failed to walk 'allfile'");
			return (DCMD_ERR);
		}
	} else {
		mdb_printf("%<u>%-4s %4s %?s ", "FD", "TYPE", "VNODE");
		if (cb.opt_p)
			mdb_printf("PATH");
		else
			mdb_printf("INFO");
		mdb_printf("%</u>\n");

		if (mdb_pwalk("allfile", (mdb_walk_cb_t)pfile_callback, &cb,
		    addr) == -1) {
			mdb_warn("failed to walk 'allfile'");
			return (DCMD_ERR);
		}
	}


	return (DCMD_OK);
}

void
pfiles_help(void)
{
	mdb_printf(
	    "Given the address of a process, print information about files\n"
	    "which the process has open.  By default, this includes decoded\n"
	    "information about the file depending on file and filesystem type\n"
	    "\n"
	    "\t-p\tPathnames; omit decoded information.  Only display "
	    "pathnames\n"
	    "\t-f\tfile_t view; show the file_t structure corresponding to "
	    "the fd\n");
}