Hi Praveen, Thank you for the patch! Yet something to improve: [auto build test ERROR on 139711f033f636cc78b6aaf7363252241b9698ef] url: https://github.com/0day-ci/linux/commits/Praveen-Chaudhary/Allow-user-to-... base: 139711f033f636cc78b6aaf7363252241b9698ef config: nds32-randconfig-r015-20210115 (attached as .config) compiler: nds32le-linux-gcc (GCC) 9.3.0 reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # https://github.com/0day-ci/linux/commit/35f232fe80f8b50430aee1c6e534cba11... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Praveen-Chaudhary/Allow-user-to-set-metric-on-default-route-learned-via-Router-Advertisement/20210115-160758 git checkout 35f232fe80f8b50430aee1c6e534cba119c88de8 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=nds32 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): net/ipv6/ndisc.c: In function 'ndisc_router_discovery': 1308 | defrtr_usr_metric = in6_dev->cnf.accept_ra_defrtr_metric; | ^~~~~~~~~~~~~~~~~~~~~~~ | accept_ra_defrtr Kconfig warnings: (for reference only) WARNING: unmet direct dependencies detected for FRAME_POINTER Depends on DEBUG_KERNEL && (M68K || UML || SUPERH) || ARCH_WANT_FRAME_POINTERS Selected by - LATENCYTOP && DEBUG_KERNEL && STACKTRACE_SUPPORT && PROC_FS && !MIPS && !PPC && !S390 && !MICROBLAZE && !ARM && !ARC && !X86 vim +1308 net/ipv6/ndisc.c 1241 1242 if (in6_dev->if_flags & IF_RS_SENT) { 1243 /* 1244 * flag that an RA was received after an RS was sent 1245 * out on this interface. 1246 */ 1247 in6_dev->if_flags |= IF_RA_RCVD; 1248 } 1249 1250 /* 1251 * Remember the managed/otherconf flags from most recently 1252 * received RA message (RFC 2462) -- yoshfuji 1253 */ 1254 old_if_flags = in6_dev->if_flags; 1255 in6_dev->if_flags = (in6_dev->if_flags & ~(IF_RA_MANAGED | 1256 IF_RA_OTHERCONF)) | 1257 (ra_msg->icmph.icmp6_addrconf_managed ? 1258 IF_RA_MANAGED : 0) | 1259 (ra_msg->icmph.icmp6_addrconf_other ? 1260 IF_RA_OTHERCONF : 0); 1261 1262 if (old_if_flags != in6_dev->if_flags) 1263 send_ifinfo_notify = true; 1264 1265 if (!in6_dev->cnf.accept_ra_defrtr) { 1266 ND_PRINTK(2, info, 1267 "RA: %s, defrtr is false for dev: %s\n", 1268 __func__, skb->dev->name); 1269 goto skip_defrtr; 1270 } 1271 1272 /* Do not accept RA with source-addr found on local machine unless 1273 * accept_ra_from_local is set to true. 1274 */ 1275 net = dev_net(in6_dev->dev); 1276 if (!in6_dev->cnf.accept_ra_from_local && 1277 ipv6_chk_addr(net, &ipv6_hdr(skb)->saddr, in6_dev->dev, 0)) { 1278 ND_PRINTK(2, info, 1279 "RA from local address detected on dev: %s: default router ignored\n", 1280 skb->dev->name); 1281 goto skip_defrtr; 1282 } 1283 1284 lifetime = ntohs(ra_msg->icmph.icmp6_rt_lifetime); 1285 1286 #ifdef CONFIG_IPV6_ROUTER_PREF 1287 pref = ra_msg->icmph.icmp6_router_pref; 1288 /* 10b is handled as if it were 00b (medium) */ 1289 if (pref == ICMPV6_ROUTER_PREF_INVALID || 1290 !in6_dev->cnf.accept_ra_rtr_pref) 1291 pref = ICMPV6_ROUTER_PREF_MEDIUM; 1292 #endif 1293 /* routes added from RAs do not use nexthop objects */ 1294 rt = rt6_get_dflt_router(net, &ipv6_hdr(skb)->saddr, skb->dev); 1295 if (rt) { 1296 neigh = ip6_neigh_lookup(&rt->fib6_nh->fib_nh_gw6, 1297 rt->fib6_nh->fib_nh_dev, NULL, 1298 &ipv6_hdr(skb)->saddr); 1299 if (!neigh) { 1300 ND_PRINTK(0, err, 1301 "RA: %s got default router without neighbour\n", 1302 __func__); 1303 fib6_info_release(rt); 1304 return; 1305 } 1306 } 1307 /* Set default route metric if specified by user */ 1309 if (defrtr_usr_metric == 0) 1310 defrtr_usr_metric = IP6_RT_PRIO_USER; 1311 /* delete the route if lifetime is 0 or if metric needs change */ 1312 if (rt && ((lifetime == 0) || (rt->fib6_metric != defrtr_usr_metric))) { 1313 ip6_del_rt(net, rt, false); 1314 rt = NULL; 1315 } 1316 1317 ND_PRINTK(3, info, "RA: rt: %p lifetime: %d, metric: %d, for dev: %s\n", 1318 rt, lifetime, defrtr_usr_metric, skb->dev->name); 1319 if (!rt && lifetime) { 1320 ND_PRINTK(3, info, "RA: adding default router\n"); 1321 1322 rt = rt6_add_dflt_router(net, &ipv6_hdr(skb)->saddr, 1323 skb->dev, pref, defrtr_usr_metric); 1324 if (!rt) { 1325 ND_PRINTK(0, err, 1326 "RA: %s failed to add default route\n", 1327 __func__); 1328 return; 1329 } 1330 1331 neigh = ip6_neigh_lookup(&rt->fib6_nh->fib_nh_gw6, 1332 rt->fib6_nh->fib_nh_dev, NULL, 1333 &ipv6_hdr(skb)->saddr); 1334 if (!neigh) { 1335 ND_PRINTK(0, err, 1336 "RA: %s got default router without neighbour\n", 1337 __func__); 1338 fib6_info_release(rt); 1339 return; 1340 } 1341 neigh->flags |= NTF_ROUTER; 1342 } else if (rt) { 1343 rt->fib6_flags = (rt->fib6_flags & ~RTF_PREF_MASK) | RTF_PREF(pref); 1344 } 1345 1346 if (rt) 1347 fib6_set_expires(rt, jiffies + (HZ * lifetime)); 1348 if (in6_dev->cnf.accept_ra_min_hop_limit < 256 && 1349 ra_msg->icmph.icmp6_hop_limit) { 1350 if (in6_dev->cnf.accept_ra_min_hop_limit <= ra_msg->icmph.icmp6_hop_limit) { 1351 in6_dev->cnf.hop_limit = ra_msg->icmph.icmp6_hop_limit; 1352 fib6_metric_set(rt, RTAX_HOPLIMIT, 1353 ra_msg->icmph.icmp6_hop_limit); 1354 } else { 1355 ND_PRINTK(2, warn, "RA: Got route advertisement with lower hop_limit than minimum\n"); 1356 } 1357 } 1358 1359 skip_defrtr: 1360 1361 /* 1362 * Update Reachable Time and Retrans Timer 1363 */ 1364 1365 if (in6_dev->nd_parms) { 1366 unsigned long rtime = ntohl(ra_msg->retrans_timer); 1367 1368 if (rtime && rtime/1000 < MAX_SCHEDULE_TIMEOUT/HZ) { 1369 rtime = (rtime*HZ)/1000; 1370 if (rtime < HZ/100) 1371 rtime = HZ/100; 1372 NEIGH_VAR_SET(in6_dev->nd_parms, RETRANS_TIME, rtime); 1373 in6_dev->tstamp = jiffies; 1374 send_ifinfo_notify = true; 1375 } 1376 1377 rtime = ntohl(ra_msg->reachable_time); 1378 if (rtime && rtime/1000 < MAX_SCHEDULE_TIMEOUT/(3*HZ)) { 1379 rtime = (rtime*HZ)/1000; 1380 1381 if (rtime < HZ/10) 1382 rtime = HZ/10; 1383 1384 if (rtime != NEIGH_VAR(in6_dev->nd_parms, BASE_REACHABLE_TIME)) { 1385 NEIGH_VAR_SET(in6_dev->nd_parms, 1386 BASE_REACHABLE_TIME, rtime); 1387 NEIGH_VAR_SET(in6_dev->nd_parms, 1388 GC_STALETIME, 3 * rtime); 1389 in6_dev->nd_parms->reachable_time = neigh_rand_reach_time(rtime); 1390 in6_dev->tstamp = jiffies; 1391 send_ifinfo_notify = true; 1392 } 1393 } 1394 } 1395 1396 /* 1397 * Send a notify if RA changed managed/otherconf flags or timer settings 1398 */ 1399 if (send_ifinfo_notify) 1400 inet6_ifinfo_notify(RTM_NEWLINK, in6_dev); 1401 1402 skip_linkparms: 1403 1404 /* 1405 * Process options. 1406 */ 1407 1408 if (!neigh) 1409 neigh = __neigh_lookup(&nd_tbl, &ipv6_hdr(skb)->saddr, 1410 skb->dev, 1); 1411 if (neigh) { 1412 u8 *lladdr = NULL; 1413 if (ndopts.nd_opts_src_lladdr) { 1414 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr, 1415 skb->dev); 1416 if (!lladdr) { 1417 ND_PRINTK(2, warn, 1418 "RA: invalid link-layer address length\n"); 1419 goto out; 1420 } 1421 } 1422 ndisc_update(skb->dev, neigh, lladdr, NUD_STALE, 1423 NEIGH_UPDATE_F_WEAK_OVERRIDE| 1424 NEIGH_UPDATE_F_OVERRIDE| 1425 NEIGH_UPDATE_F_OVERRIDE_ISROUTER| 1426 NEIGH_UPDATE_F_ISROUTER, 1427 NDISC_ROUTER_ADVERTISEMENT, &ndopts); 1428 } 1429 1430 if (!ipv6_accept_ra(in6_dev)) { 1431 ND_PRINTK(2, info, 1432 "RA: %s, accept_ra is false for dev: %s\n", 1433 __func__, skb->dev->name); 1434 goto out; 1435 } 1436 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org