svn commit: r360450 - in head/sys: conf net net/route
Alexander V. Chernikov
melifaro at FreeBSD.org
Tue Apr 28 20:00:18 UTC 2020
Author: melifaro
Date: Tue Apr 28 20:00:17 2020
New Revision: 360450
URL: https://svnweb.freebsd.org/changeset/base/360450
Log:
Move route-specific ddb commands to route/route_ddb.c
Currently functionality resides in rtsock.c, which is a controlling
interface, partially external to the routing subsystem.
Additionally, DDB-supporting functionality is > 100SLOC, which deserves
a separate file.
Given that, move this functionality to a newly-created net/route/ subdir.
Reviewed by: cem
Differential Revision: https://reviews.freebsd.org/D24561
Added:
head/sys/net/route/route_ddb.c (contents, props changed)
Modified:
head/sys/conf/files
head/sys/net/route.h
head/sys/net/rtsock.c
Modified: head/sys/conf/files
==============================================================================
--- head/sys/conf/files Tue Apr 28 19:14:09 2020 (r360449)
+++ head/sys/conf/files Tue Apr 28 20:00:17 2020 (r360450)
@@ -4095,6 +4095,7 @@ net/route/nhop.c standard
net/route/nhop_ctl.c standard
net/route/nhop_utils.c standard
net/route/route_ctl.c standard
+net/route/route_ddb.c optional ddb
net/route/route_helpers.c standard
net/route/route_temporal.c standard
net/rss_config.c optional inet rss | inet6 rss
Modified: head/sys/net/route.h
==============================================================================
--- head/sys/net/route.h Tue Apr 28 19:14:09 2020 (r360449)
+++ head/sys/net/route.h Tue Apr 28 20:00:17 2020 (r360450)
@@ -388,6 +388,8 @@ int rtsock_addrmsg(int, struct ifaddr *, int);
int rtsock_routemsg(int, struct rtentry *, struct ifnet *ifp, int, int);
int rtsock_routemsg_info(int, struct rt_addrinfo *, int);
+struct sockaddr *rtsock_fix_netmask(const struct sockaddr *dst,
+ const struct sockaddr *smask, struct sockaddr_storage *dmask);
/*
* Note the following locking behavior:
*
Added: head/sys/net/route/route_ddb.c
==============================================================================
--- /dev/null 00:00:00 1970 (empty, because file is newly added)
+++ head/sys/net/route/route_ddb.c Tue Apr 28 20:00:17 2020 (r360450)
@@ -0,0 +1,458 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
+ * Copyright 2019 Conrad Meyer <cem at FreeBSD.org>
+ *
+ * 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 AUTHOR 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 AUTHOR 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>
+__FBSDID("$FreeBSD$");
+#include "opt_inet.h"
+#include "opt_inet6.h"
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/malloc.h>
+#include <sys/mbuf.h>
+#include <sys/socket.h>
+#include <sys/sysctl.h>
+#include <sys/syslog.h>
+#include <sys/kernel.h>
+#include <sys/lock.h>
+#include <sys/rmlock.h>
+
+#include <ddb/ddb.h>
+#include <ddb/db_lex.h>
+
+#include <net/if.h>
+#include <net/if_var.h>
+#include <net/if_dl.h>
+#include <net/vnet.h>
+#include <net/route.h>
+#include <net/route/route_var.h>
+#include <net/route/nhop.h>
+#include <netinet/in.h>
+
+/*
+ * Unfortunately, RTF_ values are expressed as raw masks rather than powers of
+ * 2, so we cannot use them as nice C99 initializer indices below.
+ */
+static const char * const rtf_flag_strings[] = {
+ "UP",
+ "GATEWAY",
+ "HOST",
+ "REJECT",
+ "DYNAMIC",
+ "MODIFIED",
+ "DONE",
+ "UNUSED_0x80",
+ "UNUSED_0x100",
+ "XRESOLVE",
+ "LLDATA",
+ "STATIC",
+ "BLACKHOLE",
+ "UNUSED_0x2000",
+ "PROTO2",
+ "PROTO1",
+ "UNUSED_0x10000",
+ "UNUSED_0x20000",
+ "PROTO3",
+ "FIXEDMTU",
+ "PINNED",
+ "LOCAL",
+ "BROADCAST",
+ "MULTICAST",
+ /* Big gap. */
+ [28] = "STICKY",
+ [30] = "RNH_LOCKED",
+ [31] = "GWFLAG_COMPAT",
+};
+
+static const char * __pure
+rt_flag_name(unsigned idx)
+{
+ if (idx >= nitems(rtf_flag_strings))
+ return ("INVALID_FLAG");
+ if (rtf_flag_strings[idx] == NULL)
+ return ("UNKNOWN");
+ return (rtf_flag_strings[idx]);
+}
+
+static void
+rt_dumpaddr_ddb(const char *name, const struct sockaddr *sa)
+{
+ char buf[INET6_ADDRSTRLEN], *res;
+
+ res = NULL;
+ if (sa == NULL)
+ res = "NULL";
+ else if (sa->sa_family == AF_INET) {
+ res = inet_ntop(AF_INET,
+ &((const struct sockaddr_in *)sa)->sin_addr,
+ buf, sizeof(buf));
+ } else if (sa->sa_family == AF_INET6) {
+ res = inet_ntop(AF_INET6,
+ &((const struct sockaddr_in6 *)sa)->sin6_addr,
+ buf, sizeof(buf));
+ } else if (sa->sa_family == AF_LINK) {
+ res = "on link";
+ }
+
+ if (res != NULL) {
+ db_printf("%s <%s> ", name, res);
+ return;
+ }
+
+ db_printf("%s <af:%d> ", name, sa->sa_family);
+}
+
+static int
+rt_dumpentry_ddb(struct radix_node *rn, void *arg __unused)
+{
+ struct sockaddr_storage ss;
+ struct rtentry *rt;
+ int flags, idx;
+
+ /* If RNTORT is important, put it in a header. */
+ rt = (void *)rn;
+
+ rt_dumpaddr_ddb("dst", rt_key(rt));
+ rt_dumpaddr_ddb("gateway", &rt->rt_nhop->gw_sa);
+ rt_dumpaddr_ddb("netmask", rtsock_fix_netmask(rt_key(rt), rt_mask(rt),
+ &ss));
+ if (rt->rt_ifp != NULL && (rt->rt_ifp->if_flags & IFF_DYING) == 0) {
+ rt_dumpaddr_ddb("ifp", rt->rt_ifp->if_addr->ifa_addr);
+ rt_dumpaddr_ddb("ifa", rt->rt_ifa->ifa_addr);
+ }
+
+ db_printf("flags ");
+ flags = rt->rt_flags;
+ if (flags == 0)
+ db_printf("none");
+
+ while ((idx = ffs(flags)) > 0) {
+ idx--;
+
+ if (flags != rt->rt_flags)
+ db_printf(",");
+ db_printf("%s", rt_flag_name(idx));
+
+ flags &= ~(1ul << idx);
+ }
+
+ db_printf("\n");
+ return (0);
+}
+
+DB_SHOW_COMMAND(routetable, db_show_routetable_cmd)
+{
+ struct rib_head *rnh;
+ int error, i, lim;
+
+ if (have_addr)
+ i = lim = addr;
+ else {
+ i = 1;
+ lim = AF_MAX;
+ }
+
+ for (; i <= lim; i++) {
+ rnh = rt_tables_get_rnh(0, i);
+ if (rnh == NULL) {
+ if (have_addr) {
+ db_printf("%s: AF %d not supported?\n",
+ __func__, i);
+ break;
+ }
+ continue;
+ }
+
+ if (!have_addr && i > 1)
+ db_printf("\n");
+
+ db_printf("Route table for AF %d%s%s%s:\n", i,
+ (i == AF_INET || i == AF_INET6) ? " (" : "",
+ (i == AF_INET) ? "INET" : (i == AF_INET6) ? "INET6" : "",
+ (i == AF_INET || i == AF_INET6) ? ")" : "");
+
+ error = rnh->rnh_walktree(&rnh->head, rt_dumpentry_ddb, NULL);
+ if (error != 0)
+ db_printf("%s: walktree(%d): %d\n", __func__, i,
+ error);
+ }
+}
+
+_DB_FUNC(_show, route, db_show_route_cmd, db_show_table, CS_OWN, NULL)
+{
+ char buf[INET6_ADDRSTRLEN], *bp;
+ const void *dst_addrp;
+ struct sockaddr *dstp;
+ struct rtentry *rt;
+ union {
+ struct sockaddr_in dest_sin;
+ struct sockaddr_in6 dest_sin6;
+ } u;
+ uint16_t hextets[8];
+ unsigned i, tets;
+ int t, af, exp, tokflags;
+
+ /*
+ * Undecoded address family. No double-colon expansion seen yet.
+ */
+ af = -1;
+ exp = -1;
+ /* Assume INET6 to start; we can work back if guess was wrong. */
+ tokflags = DRT_WSPACE | DRT_HEX | DRT_HEXADECIMAL;
+
+ /*
+ * db_command has lexed 'show route' for us.
+ */
+ t = db_read_token_flags(tokflags);
+ if (t == tWSPACE)
+ t = db_read_token_flags(tokflags);
+
+ /*
+ * tEOL: Just 'show route' isn't a valid mode.
+ * tMINUS: It's either '-h' or some invalid option. Regardless, usage.
+ */
+ if (t == tEOL || t == tMINUS)
+ goto usage;
+
+ db_unread_token(t);
+
+ tets = nitems(hextets);
+
+ /*
+ * Each loop iteration, we expect to read one octet (v4) or hextet
+ * (v6), followed by an appropriate field separator ('.' or ':' or
+ * '::').
+ *
+ * At the start of each loop, we're looking for a number (octet or
+ * hextet).
+ *
+ * INET6 addresses have a special case where they may begin with '::'.
+ */
+ for (i = 0; i < tets; i++) {
+ t = db_read_token_flags(tokflags);
+
+ if (t == tCOLONCOLON) {
+ /* INET6 with leading '::' or invalid. */
+ if (i != 0) {
+ db_printf("Parse error: unexpected extra "
+ "colons.\n");
+ goto exit;
+ }
+
+ af = AF_INET6;
+ exp = i;
+ hextets[i] = 0;
+ continue;
+ } else if (t == tNUMBER) {
+ /*
+ * Lexer separates out '-' as tMINUS, but make the
+ * assumption explicit here.
+ */
+ MPASS(db_tok_number >= 0);
+
+ if (af == AF_INET && db_tok_number > UINT8_MAX) {
+ db_printf("Not a valid v4 octet: %ld\n",
+ (long)db_tok_number);
+ goto exit;
+ }
+ hextets[i] = db_tok_number;
+ } else if (t == tEOL) {
+ /*
+ * We can only detect the end of an IPv6 address in
+ * compact representation with EOL.
+ */
+ if (af != AF_INET6 || exp < 0) {
+ db_printf("Parse failed. Got unexpected EOF "
+ "when the address is not a compact-"
+ "representation IPv6 address.\n");
+ goto exit;
+ }
+ break;
+ } else {
+ db_printf("Parse failed. Unexpected token %d.\n", t);
+ goto exit;
+ }
+
+ /* Next, look for a separator, if appropriate. */
+ if (i == tets - 1)
+ continue;
+
+ t = db_read_token_flags(tokflags);
+ if (af < 0) {
+ if (t == tCOLON) {
+ af = AF_INET6;
+ continue;
+ }
+ if (t == tCOLONCOLON) {
+ af = AF_INET6;
+ i++;
+ hextets[i] = 0;
+ exp = i;
+ continue;
+ }
+ if (t == tDOT) {
+ unsigned hn, dn;
+
+ af = AF_INET;
+ /* Need to fixup the first parsed number. */
+ if (hextets[0] > 0x255 ||
+ (hextets[0] & 0xf0) > 0x90 ||
+ (hextets[0] & 0xf) > 9) {
+ db_printf("Not a valid v4 octet: %x\n",
+ hextets[0]);
+ goto exit;
+ }
+
+ hn = hextets[0];
+ dn = (hn >> 8) * 100 +
+ ((hn >> 4) & 0xf) * 10 +
+ (hn & 0xf);
+
+ hextets[0] = dn;
+
+ /* Switch to decimal for remaining octets. */
+ tokflags &= ~DRT_RADIX_MASK;
+ tokflags |= DRT_DECIMAL;
+
+ tets = 4;
+ continue;
+ }
+
+ db_printf("Parse error. Unexpected token %d.\n", t);
+ goto exit;
+ } else if (af == AF_INET) {
+ if (t == tDOT)
+ continue;
+ db_printf("Expected '.' (%d) between octets but got "
+ "(%d).\n", tDOT, t);
+ goto exit;
+
+ } else if (af == AF_INET6) {
+ if (t == tCOLON)
+ continue;
+ if (t == tCOLONCOLON) {
+ if (exp < 0) {
+ i++;
+ hextets[i] = 0;
+ exp = i;
+ continue;
+ }
+ db_printf("Got bogus second '::' in v6 "
+ "address.\n");
+ goto exit;
+ }
+ if (t == tEOL) {
+ /*
+ * Handle in the earlier part of the loop
+ * because we need to handle trailing :: too.
+ */
+ db_unread_token(t);
+ continue;
+ }
+
+ db_printf("Expected ':' (%d) or '::' (%d) between "
+ "hextets but got (%d).\n", tCOLON, tCOLONCOLON, t);
+ goto exit;
+ }
+ }
+
+ /* Check for trailing garbage. */
+ if (i == tets) {
+ t = db_read_token_flags(tokflags);
+ if (t != tEOL) {
+ db_printf("Got unexpected garbage after address "
+ "(%d).\n", t);
+ goto exit;
+ }
+ }
+
+ /*
+ * Need to expand compact INET6 addresses.
+ *
+ * Technically '::' for a single ':0:' is MUST NOT but just in case,
+ * don't bother expanding that form (exp >= 0 && i == tets case).
+ */
+ if (af == AF_INET6 && exp >= 0 && i < tets) {
+ if (exp + 1 < i) {
+ memmove(&hextets[exp + 1 + (nitems(hextets) - i)],
+ &hextets[exp + 1],
+ (i - (exp + 1)) * sizeof(hextets[0]));
+ }
+ memset(&hextets[exp + 1], 0, (nitems(hextets) - i) *
+ sizeof(hextets[0]));
+ }
+
+ memset(&u, 0, sizeof(u));
+ if (af == AF_INET) {
+ u.dest_sin.sin_family = AF_INET;
+ u.dest_sin.sin_len = sizeof(u.dest_sin);
+ u.dest_sin.sin_addr.s_addr = htonl(
+ ((uint32_t)hextets[0] << 24) |
+ ((uint32_t)hextets[1] << 16) |
+ ((uint32_t)hextets[2] << 8) |
+ (uint32_t)hextets[3]);
+ dstp = (void *)&u.dest_sin;
+ dst_addrp = &u.dest_sin.sin_addr;
+ } else if (af == AF_INET6) {
+ u.dest_sin6.sin6_family = AF_INET6;
+ u.dest_sin6.sin6_len = sizeof(u.dest_sin6);
+ for (i = 0; i < nitems(hextets); i++)
+ u.dest_sin6.sin6_addr.s6_addr16[i] = htons(hextets[i]);
+ dstp = (void *)&u.dest_sin6;
+ dst_addrp = &u.dest_sin6.sin6_addr;
+ } else {
+ MPASS(false);
+ /* UNREACHABLE */
+ /* Appease Clang false positive: */
+ dstp = NULL;
+ }
+
+ bp = inet_ntop(af, dst_addrp, buf, sizeof(buf));
+ if (bp != NULL)
+ db_printf("Looking up route to destination '%s'\n", bp);
+
+ CURVNET_SET(vnet0);
+ rt = rtalloc1(dstp, 0, RTF_RNH_LOCKED);
+ CURVNET_RESTORE();
+
+ if (rt == NULL) {
+ db_printf("Could not get route for that server.\n");
+ return;
+ }
+
+ rt_dumpentry_ddb((void *)rt, NULL);
+ RTFREE_LOCKED(rt);
+
+ return;
+usage:
+ db_printf("Usage: 'show route <address>'\n"
+ " Currently accepts only dotted-decimal INET or colon-separated\n"
+ " hextet INET6 addresses.\n");
+exit:
+ db_skip_to_eol();
+}
+
Modified: head/sys/net/rtsock.c
==============================================================================
--- head/sys/net/rtsock.c Tue Apr 28 19:14:09 2020 (r360449)
+++ head/sys/net/rtsock.c Tue Apr 28 20:00:17 2020 (r360450)
@@ -54,11 +54,6 @@
#include <sys/sysctl.h>
#include <sys/systm.h>
-#ifdef DDB
-#include <ddb/ddb.h>
-#include <ddb/db_lex.h>
-#endif
-
#include <net/if.h>
#include <net/if_var.h>
#include <net/if_dl.h>
@@ -68,6 +63,9 @@
#include <net/raw_cb.h>
#include <net/route.h>
#include <net/route/route_var.h>
+#ifdef RADIX_MPATH
+#include <net/radix_mpath.h>
+#endif
#include <net/vnet.h>
#include <netinet/in.h>
@@ -182,8 +180,6 @@ static int sysctl_ifmalist(int af, struct walkarg *w);
static int route_output(struct mbuf *m, struct socket *so, ...);
static void rt_getmetrics(const struct rtentry *rt, struct rt_metrics *out);
static void rt_dispatch(struct mbuf *, sa_family_t);
-static struct sockaddr *rtsock_fix_netmask(struct sockaddr *dst,
- struct sockaddr *smask, struct sockaddr_storage *dmask);
static int handle_rtm_get(struct rt_addrinfo *info, u_int fibnum,
struct rt_msghdr *rtm, struct rtentry **ret_nrt);
static int update_rtm_from_rte(struct rt_addrinfo *info,
@@ -1136,8 +1132,8 @@ rt_xaddrs(caddr_t cp, caddr_t cplim, struct rt_addrinf
* Fill in @dmask with valid netmask leaving original @smask
* intact. Mostly used with radix netmasks.
*/
-static struct sockaddr *
-rtsock_fix_netmask(struct sockaddr *dst, struct sockaddr *smask,
+struct sockaddr *
+rtsock_fix_netmask(const struct sockaddr *dst, const struct sockaddr *smask,
struct sockaddr_storage *dmask)
{
if (dst == NULL || smask == NULL)
@@ -2164,407 +2160,3 @@ static struct domain routedomain = {
VNET_DOMAIN_SET(route);
-#ifdef DDB
-/*
- * Unfortunately, RTF_ values are expressed as raw masks rather than powers of
- * 2, so we cannot use them as nice C99 initializer indices below.
- */
-static const char * const rtf_flag_strings[] = {
- "UP",
- "GATEWAY",
- "HOST",
- "REJECT",
- "DYNAMIC",
- "MODIFIED",
- "DONE",
- "UNUSED_0x80",
- "UNUSED_0x100",
- "XRESOLVE",
- "LLDATA",
- "STATIC",
- "BLACKHOLE",
- "UNUSED_0x2000",
- "PROTO2",
- "PROTO1",
- "UNUSED_0x10000",
- "UNUSED_0x20000",
- "PROTO3",
- "FIXEDMTU",
- "PINNED",
- "LOCAL",
- "BROADCAST",
- "MULTICAST",
- /* Big gap. */
- [28] = "STICKY",
- [30] = "RNH_LOCKED",
- [31] = "GWFLAG_COMPAT",
-};
-
-static const char * __pure
-rt_flag_name(unsigned idx)
-{
- if (idx >= nitems(rtf_flag_strings))
- return ("INVALID_FLAG");
- if (rtf_flag_strings[idx] == NULL)
- return ("UNKNOWN");
- return (rtf_flag_strings[idx]);
-}
-
-static void
-rt_dumpaddr_ddb(const char *name, const struct sockaddr *sa)
-{
- char buf[INET6_ADDRSTRLEN], *res;
-
- res = NULL;
- if (sa == NULL)
- res = "NULL";
- else if (sa->sa_family == AF_INET) {
- res = inet_ntop(AF_INET,
- &((const struct sockaddr_in *)sa)->sin_addr,
- buf, sizeof(buf));
- } else if (sa->sa_family == AF_INET6) {
- res = inet_ntop(AF_INET6,
- &((const struct sockaddr_in6 *)sa)->sin6_addr,
- buf, sizeof(buf));
- } else if (sa->sa_family == AF_LINK) {
- res = "on link";
- }
-
- if (res != NULL) {
- db_printf("%s <%s> ", name, res);
- return;
- }
-
- db_printf("%s <af:%d> ", name, sa->sa_family);
-}
-
-static int
-rt_dumpentry_ddb(struct radix_node *rn, void *arg __unused)
-{
- struct sockaddr_storage ss;
- struct rtentry *rt;
- int flags, idx;
-
- /* If RNTORT is important, put it in a header. */
- rt = (void *)rn;
-
- rt_dumpaddr_ddb("dst", rt_key(rt));
- rt_dumpaddr_ddb("gateway", &rt->rt_nhop->gw_sa);
- rt_dumpaddr_ddb("netmask", rtsock_fix_netmask(rt_key(rt), rt_mask(rt),
- &ss));
- if (rt->rt_ifp != NULL && (rt->rt_ifp->if_flags & IFF_DYING) == 0) {
- rt_dumpaddr_ddb("ifp", rt->rt_ifp->if_addr->ifa_addr);
- rt_dumpaddr_ddb("ifa", rt->rt_ifa->ifa_addr);
- }
-
- db_printf("flags ");
- flags = rt->rt_flags;
- if (flags == 0)
- db_printf("none");
-
- while ((idx = ffs(flags)) > 0) {
- idx--;
-
- if (flags != rt->rt_flags)
- db_printf(",");
- db_printf("%s", rt_flag_name(idx));
-
- flags &= ~(1ul << idx);
- }
-
- db_printf("\n");
- return (0);
-}
-
-DB_SHOW_COMMAND(routetable, db_show_routetable_cmd)
-{
- struct rib_head *rnh;
- int error, i, lim;
-
- if (have_addr)
- i = lim = addr;
- else {
- i = 1;
- lim = AF_MAX;
- }
-
- for (; i <= lim; i++) {
- rnh = rt_tables_get_rnh(0, i);
- if (rnh == NULL) {
- if (have_addr) {
- db_printf("%s: AF %d not supported?\n",
- __func__, i);
- break;
- }
- continue;
- }
-
- if (!have_addr && i > 1)
- db_printf("\n");
-
- db_printf("Route table for AF %d%s%s%s:\n", i,
- (i == AF_INET || i == AF_INET6) ? " (" : "",
- (i == AF_INET) ? "INET" : (i == AF_INET6) ? "INET6" : "",
- (i == AF_INET || i == AF_INET6) ? ")" : "");
-
- error = rnh->rnh_walktree(&rnh->head, rt_dumpentry_ddb, NULL);
- if (error != 0)
- db_printf("%s: walktree(%d): %d\n", __func__, i,
- error);
- }
-}
-
-_DB_FUNC(_show, route, db_show_route_cmd, db_show_table, CS_OWN, NULL)
-{
- char buf[INET6_ADDRSTRLEN], *bp;
- const void *dst_addrp;
- struct sockaddr *dstp;
- struct rtentry *rt;
- union {
- struct sockaddr_in dest_sin;
- struct sockaddr_in6 dest_sin6;
- } u;
- uint16_t hextets[8];
- unsigned i, tets;
- int t, af, exp, tokflags;
-
- /*
- * Undecoded address family. No double-colon expansion seen yet.
- */
- af = -1;
- exp = -1;
- /* Assume INET6 to start; we can work back if guess was wrong. */
- tokflags = DRT_WSPACE | DRT_HEX | DRT_HEXADECIMAL;
-
- /*
- * db_command has lexed 'show route' for us.
- */
- t = db_read_token_flags(tokflags);
- if (t == tWSPACE)
- t = db_read_token_flags(tokflags);
-
- /*
- * tEOL: Just 'show route' isn't a valid mode.
- * tMINUS: It's either '-h' or some invalid option. Regardless, usage.
- */
- if (t == tEOL || t == tMINUS)
- goto usage;
-
- db_unread_token(t);
-
- tets = nitems(hextets);
-
- /*
- * Each loop iteration, we expect to read one octet (v4) or hextet
- * (v6), followed by an appropriate field separator ('.' or ':' or
- * '::').
- *
- * At the start of each loop, we're looking for a number (octet or
- * hextet).
- *
- * INET6 addresses have a special case where they may begin with '::'.
- */
- for (i = 0; i < tets; i++) {
- t = db_read_token_flags(tokflags);
-
- if (t == tCOLONCOLON) {
- /* INET6 with leading '::' or invalid. */
- if (i != 0) {
- db_printf("Parse error: unexpected extra "
- "colons.\n");
- goto exit;
- }
-
- af = AF_INET6;
- exp = i;
- hextets[i] = 0;
- continue;
- } else if (t == tNUMBER) {
- /*
- * Lexer separates out '-' as tMINUS, but make the
- * assumption explicit here.
- */
- MPASS(db_tok_number >= 0);
-
- if (af == AF_INET && db_tok_number > UINT8_MAX) {
- db_printf("Not a valid v4 octet: %ld\n",
- (long)db_tok_number);
- goto exit;
- }
- hextets[i] = db_tok_number;
- } else if (t == tEOL) {
- /*
- * We can only detect the end of an IPv6 address in
- * compact representation with EOL.
- */
- if (af != AF_INET6 || exp < 0) {
- db_printf("Parse failed. Got unexpected EOF "
- "when the address is not a compact-"
- "representation IPv6 address.\n");
- goto exit;
- }
- break;
- } else {
- db_printf("Parse failed. Unexpected token %d.\n", t);
- goto exit;
- }
-
- /* Next, look for a separator, if appropriate. */
- if (i == tets - 1)
- continue;
-
- t = db_read_token_flags(tokflags);
- if (af < 0) {
- if (t == tCOLON) {
- af = AF_INET6;
- continue;
- }
- if (t == tCOLONCOLON) {
- af = AF_INET6;
- i++;
- hextets[i] = 0;
- exp = i;
- continue;
- }
- if (t == tDOT) {
- unsigned hn, dn;
-
- af = AF_INET;
- /* Need to fixup the first parsed number. */
- if (hextets[0] > 0x255 ||
- (hextets[0] & 0xf0) > 0x90 ||
- (hextets[0] & 0xf) > 9) {
- db_printf("Not a valid v4 octet: %x\n",
- hextets[0]);
- goto exit;
- }
-
- hn = hextets[0];
- dn = (hn >> 8) * 100 +
- ((hn >> 4) & 0xf) * 10 +
- (hn & 0xf);
-
- hextets[0] = dn;
-
- /* Switch to decimal for remaining octets. */
- tokflags &= ~DRT_RADIX_MASK;
- tokflags |= DRT_DECIMAL;
-
- tets = 4;
- continue;
- }
-
- db_printf("Parse error. Unexpected token %d.\n", t);
- goto exit;
- } else if (af == AF_INET) {
- if (t == tDOT)
- continue;
- db_printf("Expected '.' (%d) between octets but got "
- "(%d).\n", tDOT, t);
- goto exit;
-
- } else if (af == AF_INET6) {
- if (t == tCOLON)
- continue;
- if (t == tCOLONCOLON) {
- if (exp < 0) {
- i++;
- hextets[i] = 0;
- exp = i;
- continue;
- }
- db_printf("Got bogus second '::' in v6 "
- "address.\n");
- goto exit;
- }
- if (t == tEOL) {
- /*
- * Handle in the earlier part of the loop
- * because we need to handle trailing :: too.
- */
- db_unread_token(t);
- continue;
- }
-
- db_printf("Expected ':' (%d) or '::' (%d) between "
- "hextets but got (%d).\n", tCOLON, tCOLONCOLON, t);
- goto exit;
- }
- }
-
- /* Check for trailing garbage. */
- if (i == tets) {
- t = db_read_token_flags(tokflags);
- if (t != tEOL) {
- db_printf("Got unexpected garbage after address "
- "(%d).\n", t);
- goto exit;
- }
- }
-
- /*
- * Need to expand compact INET6 addresses.
- *
- * Technically '::' for a single ':0:' is MUST NOT but just in case,
- * don't bother expanding that form (exp >= 0 && i == tets case).
- */
- if (af == AF_INET6 && exp >= 0 && i < tets) {
- if (exp + 1 < i) {
- memmove(&hextets[exp + 1 + (nitems(hextets) - i)],
- &hextets[exp + 1],
- (i - (exp + 1)) * sizeof(hextets[0]));
- }
- memset(&hextets[exp + 1], 0, (nitems(hextets) - i) *
- sizeof(hextets[0]));
- }
-
- memset(&u, 0, sizeof(u));
- if (af == AF_INET) {
- u.dest_sin.sin_family = AF_INET;
- u.dest_sin.sin_len = sizeof(u.dest_sin);
- u.dest_sin.sin_addr.s_addr = htonl(
- ((uint32_t)hextets[0] << 24) |
- ((uint32_t)hextets[1] << 16) |
- ((uint32_t)hextets[2] << 8) |
- (uint32_t)hextets[3]);
- dstp = (void *)&u.dest_sin;
- dst_addrp = &u.dest_sin.sin_addr;
- } else if (af == AF_INET6) {
- u.dest_sin6.sin6_family = AF_INET6;
- u.dest_sin6.sin6_len = sizeof(u.dest_sin6);
- for (i = 0; i < nitems(hextets); i++)
- u.dest_sin6.sin6_addr.s6_addr16[i] = htons(hextets[i]);
- dstp = (void *)&u.dest_sin6;
- dst_addrp = &u.dest_sin6.sin6_addr;
- } else {
- MPASS(false);
- /* UNREACHABLE */
- /* Appease Clang false positive: */
- dstp = NULL;
- }
-
- bp = inet_ntop(af, dst_addrp, buf, sizeof(buf));
- if (bp != NULL)
- db_printf("Looking up route to destination '%s'\n", bp);
-
- CURVNET_SET(vnet0);
- rt = rtalloc1(dstp, 0, RTF_RNH_LOCKED);
- CURVNET_RESTORE();
-
- if (rt == NULL) {
- db_printf("Could not get route for that server.\n");
- return;
- }
-
- rt_dumpentry_ddb((void *)rt, NULL);
- RTFREE_LOCKED(rt);
-
- return;
-usage:
- db_printf("Usage: 'show route <address>'\n"
- " Currently accepts only dotted-decimal INET or colon-separated\n"
- " hextet INET6 addresses.\n");
-exit:
- db_skip_to_eol();
-}
-#endif
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