* Fred N. van Kempen, <waltje@uwalt.nl.mugnet.org>
* (derived from FvK's 'route.c 1.70 01/04/94')
*
- * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
+ * Licensed under GPLv2 or later, see file LICENSE in this source tree.
*
*
* displayroute() code added by Vladimir N. Oleynik <dzo@simtreas.ru>
* Rewritten to fix several bugs, add additional error checking, and
* remove ridiculous amounts of bloat.
*/
+//config:config ROUTE
+//config: bool "route (8.9 kb)"
+//config: default y
+//config: select PLATFORM_LINUX
+//config: help
+//config: Route displays or manipulates the kernel's IP routing tables.
+
+//applet:IF_ROUTE(APPLET(route, BB_DIR_SBIN, BB_SUID_DROP))
+
+//kbuild:lib-$(CONFIG_ROUTE) += route.o
+
+//usage:#define route_trivial_usage
+//usage: "[{add|del|delete}]"
+//usage:#define route_full_usage "\n\n"
+//usage: "Edit kernel routing tables\n"
+//usage: "\n -n Don't resolve names"
+//usage: "\n -e Display other/more information"
+//usage: "\n -A inet" IF_FEATURE_IPV6("{6}") " Select address family"
#include <net/route.h>
#include <net/if.h>
#define RTF_WINDOW 0x0080 /* per route window clamping */
#define RTF_IRTT 0x0100 /* Initial round trip time */
#define RTF_REJECT 0x0200 /* Reject route */
+#define RTF_NONEXTHOP 0x00200000 /* route with no nexthop */
#endif
#if defined(SIOCADDRTOLD) || defined(RTF_IRTT) /* route */
"\013\043reinstate" /* Since last, we can save a byte. */
;
-static const int flags_ipvx[] = { /* MUST match tbl_ipvx[] values above. */
+static const uint16_t flags_ipvx[] = { /* MUST match tbl_ipvx[] values above. */
#ifdef RTF_REJECT
RTF_REJECT,
#endif
/* Add or delete a route, depending on action. */
-static void INET_setroute(int action, char **args)
+static NOINLINE void INET_setroute(int action, char **args)
{
- struct rtentry rt;
+ /* char buffer instead of bona-fide struct avoids aliasing warning */
+ char rt_buf[sizeof(struct rtentry)];
+ struct rtentry *const rt = (void *)rt_buf;
+
const char *netmask = NULL;
int skfd, isnet, xflag;
}
/* Clean out the RTREQ structure. */
- memset(&rt, 0, sizeof(rt));
+ memset(rt, 0, sizeof(*rt));
{
const char *target = *args++;
int prefix_len;
prefix_len = xatoul_range(prefix+1, 0, 32);
- mask_in_addr(rt) = htonl( ~ (0xffffffffUL >> prefix_len));
+ mask_in_addr(*rt) = htonl( ~(0xffffffffUL >> prefix_len));
*prefix = '\0';
#if HAVE_NEW_ADDRT
- rt.rt_genmask.sa_family = AF_INET;
+ rt->rt_genmask.sa_family = AF_INET;
#endif
} else {
/* Default netmask. */
- netmask = bb_str_default;
+ netmask = "default";
}
/* Prefer hostname lookup is -host flag (xflag==1) was given. */
- isnet = INET_resolve(target, (struct sockaddr_in *) &rt.rt_dst,
+ isnet = INET_resolve(target, (struct sockaddr_in *) &rt->rt_dst,
(xflag & HOST_FLAG));
if (isnet < 0) {
bb_error_msg_and_die("resolving %s", target);
}
/* Fill in the other fields. */
- rt.rt_flags = ((isnet) ? RTF_UP : (RTF_UP | RTF_HOST));
+ rt->rt_flags = ((isnet) ? RTF_UP : (RTF_UP | RTF_HOST));
while (*args) {
int k = kw_lookup(tbl_ipvx, &args);
const char *args_m1 = args[-1];
if (k & KW_IPVx_FLAG_ONLY) {
- rt.rt_flags |= flags_ipvx[k & 3];
+ rt->rt_flags |= flags_ipvx[k & 3];
continue;
}
#if HAVE_NEW_ADDRT
if (k == KW_IPVx_METRIC) {
- rt.rt_metric = xatoul(args_m1) + 1;
+ rt->rt_metric = xatoul(args_m1) + 1;
continue;
}
#endif
if (k == KW_IPVx_NETMASK) {
struct sockaddr mask;
- if (mask_in_addr(rt)) {
+ if (mask_in_addr(*rt)) {
bb_show_usage();
}
if (isnet < 0) {
bb_error_msg_and_die("resolving %s", netmask);
}
- rt.rt_genmask = full_mask(mask);
+ rt->rt_genmask = full_mask(mask);
continue;
}
if (k == KW_IPVx_GATEWAY) {
- if (rt.rt_flags & RTF_GATEWAY) {
+ if (rt->rt_flags & RTF_GATEWAY) {
bb_show_usage();
}
isnet = INET_resolve(args_m1,
- (struct sockaddr_in *) &rt.rt_gateway, 1);
- rt.rt_flags |= RTF_GATEWAY;
+ (struct sockaddr_in *) &rt->rt_gateway, 1);
+ rt->rt_flags |= RTF_GATEWAY;
if (isnet) {
if (isnet < 0) {
}
if (k == KW_IPVx_MSS) { /* Check valid MSS bounds. */
- rt.rt_flags |= RTF_MSS;
- rt.rt_mss = xatoul_range(args_m1, 64, 32768);
+ rt->rt_flags |= RTF_MSS;
+ rt->rt_mss = xatoul_range(args_m1, 64, 32768);
continue;
}
if (k == KW_IPVx_WINDOW) { /* Check valid window bounds. */
- rt.rt_flags |= RTF_WINDOW;
- rt.rt_window = xatoul_range(args_m1, 128, INT_MAX);
+ rt->rt_flags |= RTF_WINDOW;
+ rt->rt_window = xatoul_range(args_m1, 128, INT_MAX);
continue;
}
#ifdef RTF_IRTT
if (k == KW_IPVx_IRTT) {
- rt.rt_flags |= RTF_IRTT;
- rt.rt_irtt = xatoul(args_m1);
- rt.rt_irtt *= (sysconf(_SC_CLK_TCK) / 100); /* FIXME */
+ rt->rt_flags |= RTF_IRTT;
+ rt->rt_irtt = xatoul(args_m1);
+ rt->rt_irtt *= (bb_clk_tck() / 100); /* FIXME */
#if 0 /* FIXME: do we need to check anything of this? */
- if (rt.rt_irtt < 1 || rt.rt_irtt > (120 * HZ)) {
+ if (rt->rt_irtt < 1 || rt->rt_irtt > (120 * HZ)) {
bb_error_msg_and_die("bad irtt");
}
#endif
#endif
/* Device is special in that it can be the last arg specified
- * and doesn't requre the dev/device keyword in that case. */
- if (!rt.rt_dev && ((k == KW_IPVx_DEVICE) || (!k && !*++args))) {
+ * and doesn't require the dev/device keyword in that case. */
+ if (!rt->rt_dev && ((k == KW_IPVx_DEVICE) || (!k && !*++args))) {
/* Don't use args_m1 here since args may have changed! */
- rt.rt_dev = args[-1];
+ rt->rt_dev = args[-1];
continue;
}
}
#ifdef RTF_REJECT
- if ((rt.rt_flags & RTF_REJECT) && !rt.rt_dev) {
- rt.rt_dev = (char*)"lo";
+ if ((rt->rt_flags & RTF_REJECT) && !rt->rt_dev) {
+ rt->rt_dev = (char*)"lo";
}
#endif
/* sanity checks.. */
- if (mask_in_addr(rt)) {
- uint32_t mask = mask_in_addr(rt);
+ if (mask_in_addr(*rt)) {
+ uint32_t mask = mask_in_addr(*rt);
mask = ~ntohl(mask);
- if ((rt.rt_flags & RTF_HOST) && mask != 0xffffffff) {
+ if ((rt->rt_flags & RTF_HOST) && mask != 0xffffffff) {
bb_error_msg_and_die("netmask %.8x and host route conflict",
(unsigned int) mask);
}
if (mask & (mask + 1)) {
bb_error_msg_and_die("bogus netmask %s", netmask);
}
- mask = ((struct sockaddr_in *) &rt.rt_dst)->sin_addr.s_addr;
- if (mask & ~(uint32_t)mask_in_addr(rt)) {
+ mask = ((struct sockaddr_in *) &rt->rt_dst)->sin_addr.s_addr;
+ if (mask & ~(uint32_t)mask_in_addr(*rt)) {
bb_error_msg_and_die("netmask and route address conflict");
}
}
/* Fill out netmask if still unset */
- if ((action == RTACTION_ADD) && (rt.rt_flags & RTF_HOST)) {
- mask_in_addr(rt) = 0xffffffff;
+ if ((action == RTACTION_ADD) && (rt->rt_flags & RTF_HOST)) {
+ mask_in_addr(*rt) = 0xffffffff;
}
/* Create a socket to the INET kernel. */
skfd = xsocket(AF_INET, SOCK_DGRAM, 0);
if (action == RTACTION_ADD)
- xioctl(skfd, SIOCADDRT, &rt);
+ xioctl(skfd, SIOCADDRT, rt);
else
- xioctl(skfd, SIOCDELRT, &rt);
+ xioctl(skfd, SIOCDELRT, rt);
if (ENABLE_FEATURE_CLEAN_UP) close(skfd);
}
#if ENABLE_FEATURE_IPV6
-static void INET6_setroute(int action, char **args)
+static NOINLINE void INET6_setroute(int action, char **args)
{
struct sockaddr_in6 sa6;
struct in6_rtmsg rt;
/* We know args isn't NULL from the check in route_main. */
const char *target = *args++;
- if (strcmp(target, bb_str_default) == 0) {
+ if (strcmp(target, "default") == 0) {
prefix_len = 0;
memset(&sa6, 0, sizeof(sa6));
} else {
bb_error_msg_and_die("resolving %s", args_m1);
}
memcpy(&rt.rtmsg_gateway, sa6.sin6_addr.s6_addr,
- sizeof(struct in6_addr));
+ sizeof(struct in6_addr));
rt.rtmsg_flags |= RTF_GATEWAY;
continue;
}
/* Device is special in that it can be the last arg specified
- * and doesn't requre the dev/device keyword in that case. */
+ * and doesn't require the dev/device keyword in that case. */
if (!devname && ((k == KW_IPVx_DEVICE) || (!k && !*++args))) {
/* Don't use args_m1 here since args may have changed! */
devname = args[-1];
struct ifreq ifr;
memset(&ifr, 0, sizeof(ifr));
strncpy_IFNAMSIZ(ifr.ifr_name, devname);
- xioctl(skfd, SIOGIFINDEX, &ifr);
+ xioctl(skfd, SIOCGIFINDEX, &ifr);
rt.rtmsg_ifindex = ifr.ifr_ifindex;
}
}
#endif
-static const unsigned flagvals[] = { /* Must agree with flagchars[]. */
+static const
+IF_NOT_FEATURE_IPV6(uint16_t)
+IF_FEATURE_IPV6(unsigned)
+flagvals[] = { /* Must agree with flagchars[]. */
+ RTF_UP,
RTF_GATEWAY,
RTF_HOST,
RTF_REINSTATE,
#if ENABLE_FEATURE_IPV6
RTF_DEFAULT,
RTF_ADDRCONF,
- RTF_CACHE
+ RTF_CACHE,
+ RTF_REJECT,
+ RTF_NONEXTHOP, /* this one doesn't fit into 16 bits */
#endif
};
-
-#define IPV4_MASK (RTF_GATEWAY|RTF_HOST|RTF_REINSTATE|RTF_DYNAMIC|RTF_MODIFIED)
-#define IPV6_MASK (RTF_GATEWAY|RTF_HOST|RTF_DEFAULT|RTF_ADDRCONF|RTF_CACHE)
-
/* Must agree with flagvals[]. */
static const char flagchars[] ALIGN1 =
- "GHRDM"
+ "UGHRDM"
#if ENABLE_FEATURE_IPV6
- "DAC"
+ "DAC!n"
#endif
;
+#define IPV4_MASK (RTF_UP|RTF_GATEWAY|RTF_HOST|RTF_REINSTATE|RTF_DYNAMIC|RTF_MODIFIED)
+#define IPV6_MASK (RTF_UP|RTF_GATEWAY|RTF_HOST|RTF_DEFAULT|RTF_ADDRCONF|RTF_CACHE|RTF_REJECT|RTF_NONEXTHOP)
static void set_flags(char *flagstr, int flags)
{
int i;
- *flagstr++ = 'U';
-
for (i = 0; (*flagstr = flagchars[i]) != 0; i++) {
if (flags & flagvals[i]) {
++flagstr;
{
char devname[64], flags[16], *sdest, *sgw;
unsigned long d, g, m;
+ int r;
int flgs, ref, use, metric, mtu, win, ir;
struct sockaddr_in s_addr;
struct in_addr mask;
FILE *fp = xfopen_for_read("/proc/net/route");
printf("Kernel IP routing table\n"
- "Destination Gateway Genmask Flags %s Iface\n",
+ "Destination Gateway Genmask Flags %s Iface\n",
netstatfmt ? " MSS Window irtt" : "Metric Ref Use");
- if (fscanf(fp, "%*[^\n]\n") < 0) { /* Skip the first line. */
- goto ERROR; /* Empty or missing line, or read error. */
+ /* Skip the first line. */
+ r = fscanf(fp, "%*[^\n]\n");
+ if (r < 0) {
+ /* Empty line, read error, or EOF. Yes, if routing table
+ * is completely empty, /proc/net/route has no header.
+ */
+ goto ERROR;
}
while (1) {
- int r;
r = fscanf(fp, "%63s%lx%lx%X%d%d%d%lx%d%d%d\n",
- devname, &d, &g, &flgs, &ref, &use, &metric, &m,
- &mtu, &win, &ir);
+ devname, &d, &g, &flgs, &ref, &use, &metric, &m,
+ &mtu, &win, &ir);
if (r != 11) {
+ ERROR:
if ((r < 0) && feof(fp)) { /* EOF with no (nonspace) chars read. */
break;
}
- ERROR:
- bb_error_msg_and_die("fscanf");
+ bb_perror_msg_and_die(bb_msg_read_error);
}
if (!(flgs & RTF_UP)) { /* Skip interfaces that are down. */
printf("%-6d %-2d %7d %s\n", metric, ref, use, devname);
}
}
+ fclose(fp);
}
#if ENABLE_FEATURE_IPV6
FILE *fp = xfopen_for_read("/proc/net/ipv6_route");
printf("Kernel IPv6 routing table\n%-44s%-40s"
- "Flags Metric Ref Use Iface\n",
- "Destination", "Next Hop");
+ "Flags Metric Ref Use Iface\n",
+ "Destination", "Next Hop");
while (1) {
int r;
r = fscanf(fp, "%32s%x%*s%x%32s%x%x%x%x%s\n",
addr6x+14, &prefix_len, &slen, addr6x+40+7,
- &metric, &use, &refcnt, &iflags, iface);
+ &metric, &refcnt, &use, &iflags, iface);
if (r != 9) {
if ((r < 0) && feof(fp)) { /* EOF with no (nonspace) chars read. */
break;
}
ERROR:
- bb_error_msg_and_die("fscanf");
+ bb_perror_msg_and_die(bb_msg_read_error);
}
/* Do the addr6x shift-and-insert changes to ':'-delimit addresses.
} while (i < 40+28+7);
}
- if (!(iflags & RTF_UP)) { /* Skip interfaces that are down. */
- continue;
- }
-
set_flags(flags, (iflags & IPV6_MASK));
r = 0;
- do {
+ while (1) {
inet_pton(AF_INET6, addr6x + r,
(struct sockaddr *) &snaddr6.sin6_addr);
snaddr6.sin6_family = AF_INET6;
naddr6 = INET6_rresolve((struct sockaddr_in6 *) &snaddr6,
- 0x0fff /* Apparently, upstream never resolves. */
- );
+ 0x0fff /* Apparently, upstream never resolves. */
+ );
if (!r) { /* 1st pass */
snprintf(addr6, sizeof(addr6), "%s/%d", naddr6, prefix_len);
free(naddr6);
break;
}
- } while (1);
+ }
}
+ fclose(fp);
}
#endif
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