ddb(4): Add 'show route <dest>' and 'show routetable [<af>]'
These commands show the route resolved for a specified destination, or print out the entire routing table for a given address family (or all families, if none is explicitly provided). Discussed with: emaste Differential Revision: https://reviews.freebsd.org/D21510
This commit is contained in:
cem
parent
667493abd7
commit
468799be93
@ -60,7 +60,7 @@
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.\"
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.\" $FreeBSD$
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.\"
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.Dd November 30, 2018
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.Dd September 9, 2019
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.Dt DDB 4
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.Os
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.Sh NAME
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@ -955,6 +955,20 @@ Addresses of particular pointers can be gathered with "show allrman"
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command.
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.\"
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.Pp
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.It Ic show Cm route Ar addr
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Show route table result for destination
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.Ar addr .
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At this time, INET and INET6 formatted addresses are supported.
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.\"
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.Pp
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.It Ic show Cm routetable Oo Ar af Oc
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Show full route table or tables.
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If
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.Ar af
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is specified, show only routes for the given numeric address family.
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If no argument is specified, dump the route table for all address families.
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.\"
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.Pp
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.It Ic show Cm rtc
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Show real time clock value.
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Useful for long debugging sessions.
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407
sys/net/rtsock.c
407
sys/net/rtsock.c
@ -31,6 +31,7 @@
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* @(#)rtsock.c 8.7 (Berkeley) 10/12/95
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* $FreeBSD$
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*/
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#include "opt_ddb.h"
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#include "opt_mpath.h"
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#include "opt_inet.h"
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#include "opt_inet6.h"
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@ -53,6 +54,11 @@
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#include <sys/sysctl.h>
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#include <sys/systm.h>
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#ifdef DDB
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#include <ddb/ddb.h>
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#include <ddb/db_lex.h>
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#endif
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#include <net/if.h>
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#include <net/if_var.h>
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#include <net/if_dl.h>
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@ -1995,3 +2001,404 @@ static struct domain routedomain = {
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};
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VNET_DOMAIN_SET(route);
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#ifdef DDB
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/*
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* Unfortunately, RTF_ values are expressed as raw masks rather than powers of
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* 2, so we cannot use them as nice C99 initializer indices below.
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*/
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static const char * const rtf_flag_strings[] = {
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"UP",
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"GATEWAY",
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"HOST",
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"REJECT",
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"DYNAMIC",
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"MODIFIED",
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"DONE",
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"UNUSED_0x80",
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"UNUSED_0x100",
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"XRESOLVE",
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"LLDATA",
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"STATIC",
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"BLACKHOLE",
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"UNUSED_0x2000",
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"PROTO2",
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"PROTO1",
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"UNUSED_0x10000",
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"UNUSED_0x20000",
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"PROTO3",
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"FIXEDMTU",
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"PINNED",
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"LOCAL",
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"BROADCAST",
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"MULTICAST",
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/* Big gap. */
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[28] = "STICKY",
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[30] = "RNH_LOCKED",
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[31] = "GWFLAG_COMPAT",
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};
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static const char * __pure
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rt_flag_name(unsigned idx)
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{
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if (idx >= nitems(rtf_flag_strings))
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return ("INVALID_FLAG");
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if (rtf_flag_strings[idx] == NULL)
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return ("UNKNOWN");
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return (rtf_flag_strings[idx]);
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}
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static void
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rt_dumpaddr_ddb(const char *name, const struct sockaddr *sa)
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{
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char buf[INET6_ADDRSTRLEN], *res;
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res = NULL;
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if (sa == NULL)
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res = "NULL";
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else if (sa->sa_family == AF_INET) {
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res = inet_ntop(AF_INET,
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&((const struct sockaddr_in *)sa)->sin_addr,
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buf, sizeof(buf));
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} else if (sa->sa_family == AF_INET6) {
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res = inet_ntop(AF_INET6,
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&((const struct sockaddr_in6 *)sa)->sin6_addr,
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buf, sizeof(buf));
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} else if (sa->sa_family == AF_LINK) {
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res = "on link";
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}
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if (res != NULL) {
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db_printf("%s <%s> ", name, res);
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return;
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}
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db_printf("%s <af:%d> ", name, sa->sa_family);
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}
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static int
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rt_dumpentry_ddb(struct radix_node *rn, void *arg __unused)
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{
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struct sockaddr_storage ss;
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struct rtentry *rt;
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int flags, idx;
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/* If RNTORT is important, put it in a header. */
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rt = (void *)rn;
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rt_dumpaddr_ddb("dst", rt_key(rt));
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rt_dumpaddr_ddb("gateway", rt->rt_gateway);
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rt_dumpaddr_ddb("netmask", rtsock_fix_netmask(rt_key(rt), rt_mask(rt),
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&ss));
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if (rt->rt_ifp != NULL && (rt->rt_ifp->if_flags & IFF_DYING) == 0) {
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rt_dumpaddr_ddb("ifp", rt->rt_ifp->if_addr->ifa_addr);
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rt_dumpaddr_ddb("ifa", rt->rt_ifa->ifa_addr);
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}
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db_printf("flags ");
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flags = rt->rt_flags;
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if (flags == 0)
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db_printf("none");
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while ((idx = ffs(flags)) > 0) {
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idx--;
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if (flags != rt->rt_flags)
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db_printf(",");
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db_printf(rt_flag_name(idx));
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flags &= ~(1ul << idx);
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}
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db_printf("\n");
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return (0);
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}
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DB_SHOW_COMMAND(routetable, db_show_routetable_cmd)
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{
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struct rib_head *rnh;
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int error, i, lim;
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if (have_addr)
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i = lim = addr;
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else {
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i = 1;
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lim = AF_MAX;
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}
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for (; i <= lim; i++) {
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rnh = rt_tables_get_rnh(0, i);
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if (rnh == NULL) {
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if (have_addr) {
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db_printf("%s: AF %d not supported?\n",
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__func__, i);
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break;
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}
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continue;
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}
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if (!have_addr && i > 1)
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db_printf("\n");
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db_printf("Route table for AF %d%s%s%s:\n", i,
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(i == AF_INET || i == AF_INET6) ? " (" : "",
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(i == AF_INET) ? "INET" : (i == AF_INET6) ? "INET6" : "",
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(i == AF_INET || i == AF_INET6) ? ")" : "");
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error = rnh->rnh_walktree(&rnh->head, rt_dumpentry_ddb, NULL);
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if (error != 0)
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db_printf("%s: walktree(%d): %d\n", __func__, i,
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error);
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}
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}
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_DB_FUNC(_show, route, db_show_route_cmd, db_show_table, CS_OWN, NULL)
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{
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char buf[INET6_ADDRSTRLEN], *bp;
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const void *dst_addrp;
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struct sockaddr *dstp;
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struct rtentry *rt;
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union {
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struct sockaddr_in dest_sin;
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struct sockaddr_in6 dest_sin6;
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} u;
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uint16_t hextets[8];
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unsigned i, tets;
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int t, af, exp, tokflags;
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/*
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* Undecoded address family. No double-colon expansion seen yet.
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*/
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af = -1;
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exp = -1;
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/* Assume INET6 to start; we can work back if guess was wrong. */
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tokflags = DRT_WSPACE | DRT_HEX | DRT_HEXADECIMAL;
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/*
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* db_command has lexed 'show route' for us.
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*/
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t = db_read_token_flags(tokflags);
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if (t == tWSPACE)
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t = db_read_token_flags(tokflags);
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/*
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* tEOL: Just 'show route' isn't a valid mode.
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* tMINUS: It's either '-h' or some invalid option. Regardless, usage.
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*/
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if (t == tEOL || t == tMINUS)
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goto usage;
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db_unread_token(t);
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tets = nitems(hextets);
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/*
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* Each loop iteration, we expect to read one octet (v4) or hextet
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* (v6), followed by an appropriate field separator ('.' or ':' or
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* '::').
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*
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* At the start of each loop, we're looking for a number (octet or
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* hextet).
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*
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* INET6 addresses have a special case where they may begin with '::'.
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*/
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for (i = 0; i < tets; i++) {
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t = db_read_token_flags(tokflags);
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if (t == tCOLONCOLON) {
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/* INET6 with leading '::' or invalid. */
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if (i != 0) {
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db_printf("Parse error: unexpected extra "
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"colons.\n");
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goto exit;
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}
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af = AF_INET6;
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exp = i;
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hextets[i] = 0;
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continue;
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} else if (t == tNUMBER) {
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/*
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* Lexer separates out '-' as tMINUS, but make the
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* assumption explicit here.
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*/
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MPASS(db_tok_number >= 0);
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if (af == AF_INET && db_tok_number > UINT8_MAX) {
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db_printf("Not a valid v4 octet: %ld\n",
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db_tok_number);
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goto exit;
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}
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hextets[i] = db_tok_number;
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} else if (t == tEOL) {
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/*
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* We can only detect the end of an IPv6 address in
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* compact representation with EOL.
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*/
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if (af != AF_INET6 || exp < 0) {
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db_printf("Parse failed. Got unexpected EOF "
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"when the address is not a compact-"
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"representation IPv6 address.\n");
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goto exit;
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}
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break;
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} else {
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db_printf("Parse failed. Unexpected token %d.\n", t);
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goto exit;
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}
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/* Next, look for a separator, if appropriate. */
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if (i == tets - 1)
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continue;
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t = db_read_token_flags(tokflags);
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if (af < 0) {
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if (t == tCOLON) {
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af = AF_INET6;
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continue;
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}
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if (t == tCOLONCOLON) {
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af = AF_INET6;
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i++;
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hextets[i] = 0;
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exp = i;
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continue;
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}
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if (t == tDOT) {
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unsigned hn, dn;
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af = AF_INET;
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/* Need to fixup the first parsed number. */
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if (hextets[0] > 0x255 ||
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(hextets[0] & 0xf0) > 0x90 ||
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(hextets[0] & 0xf) > 9) {
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db_printf("Not a valid v4 octet: %x\n",
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hextets[0]);
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goto exit;
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}
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hn = hextets[0];
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dn = (hn >> 8) * 100 +
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((hn >> 4) & 0xf) * 10 +
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(hn & 0xf);
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hextets[0] = dn;
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/* Switch to decimal for remaining octets. */
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tokflags &= ~DRT_RADIX_MASK;
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tokflags |= DRT_DECIMAL;
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tets = 4;
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continue;
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}
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db_printf("Parse error. Unexpected token %d.\n", t);
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goto exit;
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} else if (af == AF_INET) {
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if (t == tDOT)
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continue;
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db_printf("Expected '.' (%d) between octets but got "
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"(%d).\n", tDOT, t);
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goto exit;
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} else if (af == AF_INET6) {
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if (t == tCOLON)
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continue;
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if (t == tCOLONCOLON) {
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if (exp < 0) {
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i++;
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hextets[i] = 0;
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exp = i;
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continue;
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}
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db_printf("Got bogus second '::' in v6 "
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"address.\n");
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goto exit;
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}
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if (t == tEOL) {
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/*
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* Handle in the earlier part of the loop
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* because we need to handle trailing :: too.
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*/
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db_unread_token(t);
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continue;
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}
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db_printf("Expected ':' (%d) or '::' (%d) between "
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"hextets but got (%d).\n", tCOLON, tCOLONCOLON, t);
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goto exit;
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}
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}
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/* Check for trailing garbage. */
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if (i == tets) {
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t = db_read_token_flags(tokflags);
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if (t != tEOL) {
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db_printf("Got unexpected garbage after address "
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"(%d).\n", t);
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goto exit;
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}
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}
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/*
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* Need to expand compact INET6 addresses.
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*
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* Technically '::' for a single ':0:' is MUST NOT but just in case,
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* don't bother expanding that form (exp >= 0 && i == tets case).
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*/
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if (af == AF_INET6 && exp >= 0 && i < tets) {
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if (exp + 1 < i) {
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memmove(&hextets[exp + 1 + (nitems(hextets) - i)],
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&hextets[exp + 1],
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(i - (exp + 1)) * sizeof(hextets[0]));
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}
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memset(&hextets[exp + 1], 0, (nitems(hextets) - i) *
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sizeof(hextets[0]));
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}
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memset(&u, 0, sizeof(u));
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if (af == AF_INET) {
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u.dest_sin.sin_family = AF_INET;
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u.dest_sin.sin_len = sizeof(u.dest_sin);
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u.dest_sin.sin_addr.s_addr = htonl(
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((uint32_t)hextets[0] << 24) |
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((uint32_t)hextets[1] << 16) |
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((uint32_t)hextets[2] << 8) |
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(uint32_t)hextets[3]);
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dstp = (void *)&u.dest_sin;
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dst_addrp = &u.dest_sin.sin_addr;
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} else if (af == AF_INET6) {
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u.dest_sin6.sin6_family = AF_INET6;
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u.dest_sin6.sin6_len = sizeof(u.dest_sin6);
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for (i = 0; i < nitems(hextets); i++)
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u.dest_sin6.sin6_addr.s6_addr16[i] = htons(hextets[i]);
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dstp = (void *)&u.dest_sin6;
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dst_addrp = &u.dest_sin6.sin6_addr;
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} else
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MPASS(false);
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bp = inet_ntop(af, dst_addrp, buf, sizeof(buf));
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if (bp != NULL)
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db_printf("Looking up route to destination '%s'\n", bp);
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CURVNET_SET(vnet0);
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rt = rtalloc1(dstp, 0, RTF_RNH_LOCKED);
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CURVNET_RESTORE();
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if (rt == NULL) {
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db_printf("Could not get route for that server.\n");
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return;
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}
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rt_dumpentry_ddb((void *)rt, NULL);
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RTFREE_LOCKED(rt);
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return;
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usage:
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db_printf("Usage: 'show route <address>'\n"
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" Currently accepts only dotted-decimal INET or colon-separated\n"
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" hextet INET6 addresses.\n");
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exit:
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db_skip_to_eol();
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}
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#endif
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