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SubjectRe: [PATCH v2 net-next 1/1] Allow user to set metric on default route learned via Router Advertisement.
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-set-metric-on-default-route-learned-via-Router-Advertisement/20210115-160758
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/35f232fe80f8b50430aee1c6e534cba119c88de8
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@intel.com>

All errors (new ones prefixed by >>):

net/ipv6/ndisc.c: In function 'ndisc_router_discovery':
>> net/ipv6/ndisc.c:1308:35: error: 'struct ipv6_devconf' has no member named 'accept_ra_defrtr_metric'; did you mean 'accept_ra_defrtr'?
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 */
> 1308 defrtr_usr_metric = in6_dev->cnf.accept_ra_defrtr_metric;
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
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