1 // SPDX-License-Identifier: GPL-2.0-or-later
71 	for (nhsel = 0, nh = (fi)->fib_nh;				\
77 	for (nhsel = 0,	nexthop_nh = (struct fib_nh *)((fi)->fib_nh);	\
86 	int nhsel; const struct fib_nh *nh = (fi)->fib_nh;		\
91 	struct fib_nh *nexthop_nh = (struct fib_nh *)((fi)->fib_nh);	\
125 		.error	= -EINVAL,
129 		.error	= -EHOSTUNREACH,
133 		.error	= -EACCES,
137 		.error	= -EAGAIN,
141 		.error	= -EINVAL,
145 		.error	= -EINVAL,
162 	dst_dev_put(&rt->dst);  in rt_fibinfo_free()
163 	dst_release_immediate(&rt->dst);  in rt_fibinfo_free()
171 	hash = rcu_dereference_protected(nhc->nhc_exceptions, 1);  in free_nh_exceptions()
181 			next = rcu_dereference_protected(fnhe->fnhe_next, 1);  in free_nh_exceptions()
183 			rt_fibinfo_free(&fnhe->fnhe_rth_input);  in free_nh_exceptions()
184 			rt_fibinfo_free(&fnhe->fnhe_rth_output);  in free_nh_exceptions()
206 			dst_dev_put(&rt->dst);  in rt_fibinfo_free_cpus()
207 			dst_release_immediate(&rt->dst);  in rt_fibinfo_free_cpus()
215 	netdev_put(nhc->nhc_dev, &nhc->nhc_dev_tracker);  in fib_nh_common_release()
216 	lwtstate_put(nhc->nhc_lwtstate);  in fib_nh_common_release()
217 	rt_fibinfo_free_cpus(nhc->nhc_pcpu_rth_output);  in fib_nh_common_release()
218 	rt_fibinfo_free(&nhc->nhc_rth_input);  in fib_nh_common_release()
226 	if (fib_nh->nh_tclassid)  in fib_nh_release()
227 		atomic_dec(&net->ipv4.fib_num_tclassid_users);  in fib_nh_release()
229 	fib_nh_common_release(&fib_nh->nh_common);  in fib_nh_release()
237 	if (fi->nh) {  in free_fib_info_rcu()
238 		nexthop_put(fi->nh);  in free_fib_info_rcu()
241 			fib_nh_release(fi->fib_net, nexthop_nh);  in free_fib_info_rcu()
245 	ip_fib_metrics_put(fi->fib_metrics);  in free_fib_info_rcu()
252 	if (fi->fib_dead == 0) {  in free_fib_info()
257 	call_rcu_hurry(&fi->rcu, free_fib_info_rcu);  in free_fib_info()
264 	if (fi && refcount_dec_and_test(&fi->fib_treeref)) {  in fib_release_info()
265 		hlist_del(&fi->fib_hash);  in fib_release_info()
268 		WRITE_ONCE(fib_info_cnt, fib_info_cnt - 1);  in fib_release_info()
270 		if (fi->fib_prefsrc)  in fib_release_info()
271 			hlist_del(&fi->fib_lhash);  in fib_release_info()
272 		if (fi->nh) {  in fib_release_info()
273 			list_del(&fi->nh_list);  in fib_release_info()
276 				if (!nexthop_nh->fib_nh_dev)  in fib_release_info()
278 				hlist_del(&nexthop_nh->nh_hash);  in fib_release_info()
282 		WRITE_ONCE(fi->fib_dead, 1);  in fib_release_info()
292 	if (fi->nh || ofi->nh)  in nh_comp()
293 		return nexthop_cmp(fi->nh, ofi->nh) ? 0 : -1;  in nh_comp()
295 	if (ofi->fib_nhs == 0)  in nh_comp()
301 		if (nh->fib_nh_oif != onh->fib_nh_oif ||  in nh_comp()
302 		    nh->fib_nh_gw_family != onh->fib_nh_gw_family ||  in nh_comp()
303 		    nh->fib_nh_scope != onh->fib_nh_scope ||  in nh_comp()
305 		    nh->fib_nh_weight != onh->fib_nh_weight ||  in nh_comp()
308 		    nh->nh_tclassid != onh->nh_tclassid ||  in nh_comp()
310 		    lwtunnel_cmp_encap(nh->fib_nh_lws, onh->fib_nh_lws) ||  in nh_comp()
311 		    ((nh->fib_nh_flags ^ onh->fib_nh_flags) & ~RTNH_COMPARE_MASK))  in nh_comp()
312 			return -1;  in nh_comp()
314 		if (nh->fib_nh_gw_family == AF_INET &&  in nh_comp()
315 		    nh->fib_nh_gw4 != onh->fib_nh_gw4)  in nh_comp()
316 			return -1;  in nh_comp()
318 		if (nh->fib_nh_gw_family == AF_INET6 &&  in nh_comp()
319 		    ipv6_addr_cmp(&nh->fib_nh_gw6, &onh->fib_nh_gw6))  in nh_comp()
320 			return -1;  in nh_comp()
333 	u32 val = net_hash_mix(dev_net(dev)) ^ dev->ifindex;  in fib_info_devhash_bucket()
352 	unsigned int mask = (fib_info_hash_size - 1);  in fib_info_hashfn_result()
361 	val = fib_info_hashfn_1(fi->fib_nhs, fi->fib_protocol,  in fib_info_hashfn()
362 				fi->fib_scope, (__force u32)fi->fib_prefsrc,  in fib_info_hashfn()
363 				fi->fib_priority);  in fib_info_hashfn()
365 	if (fi->nh) {  in fib_info_hashfn()
366 		val ^= fib_devindex_hashfn(fi->nh->id);  in fib_info_hashfn()
369 			val ^= fib_devindex_hashfn(nh->fib_nh_oif);  in fib_info_hashfn()
384 	hash = fib_info_hashfn_1(fib_devindex_hashfn(cfg->fc_nh_id),  in fib_find_info_nh()
385 				 cfg->fc_protocol, cfg->fc_scope,  in fib_find_info_nh()
386 				 (__force u32)cfg->fc_prefsrc,  in fib_find_info_nh()
387 				 cfg->fc_priority);  in fib_find_info_nh()
392 		if (!net_eq(fi->fib_net, net))  in fib_find_info_nh()
394 		if (!fi->nh || fi->nh->id != cfg->fc_nh_id)  in fib_find_info_nh()
396 		if (cfg->fc_protocol == fi->fib_protocol &&  in fib_find_info_nh()
397 		    cfg->fc_scope == fi->fib_scope &&  in fib_find_info_nh()
398 		    cfg->fc_prefsrc == fi->fib_prefsrc &&  in fib_find_info_nh()
399 		    cfg->fc_priority == fi->fib_priority &&  in fib_find_info_nh()
400 		    cfg->fc_type == fi->fib_type &&  in fib_find_info_nh()
401 		    cfg->fc_table == fi->fib_tb_id &&  in fib_find_info_nh()
402 		    !((cfg->fc_flags ^ fi->fib_flags) & ~RTNH_COMPARE_MASK))  in fib_find_info_nh()
419 		if (!net_eq(fi->fib_net, nfi->fib_net))  in fib_find_info()
421 		if (fi->fib_nhs != nfi->fib_nhs)  in fib_find_info()
423 		if (nfi->fib_protocol == fi->fib_protocol &&  in fib_find_info()
424 		    nfi->fib_scope == fi->fib_scope &&  in fib_find_info()
425 		    nfi->fib_prefsrc == fi->fib_prefsrc &&  in fib_find_info()
426 		    nfi->fib_priority == fi->fib_priority &&  in fib_find_info()
427 		    nfi->fib_type == fi->fib_type &&  in fib_find_info()
428 		    nfi->fib_tb_id == fi->fib_tb_id &&  in fib_find_info()
429 		    memcmp(nfi->fib_metrics, fi->fib_metrics,  in fib_find_info()
431 		    !((nfi->fib_flags ^ fi->fib_flags) & ~RTNH_COMPARE_MASK) &&  in fib_find_info()
452 		if (nh->fib_nh_dev == dev &&  in ip_fib_check_default()
453 		    nh->fib_nh_gw4 == gw &&  in ip_fib_check_default()
454 		    !(nh->fib_nh_flags & RTNH_F_DEAD)) {  in ip_fib_check_default()
462 	return -1;  in ip_fib_check_default()
478 	if (fi->nh)  in fib_nlmsg_size()
496 			if (nhc->nhc_lwtstate) {  in fib_nlmsg_size()
499 						nhc->nhc_lwtstate);  in fib_nlmsg_size()
519 	u32 seq = info->nlh ? info->nlh->nlmsg_seq : 0;  in rtmsg_fib()
520 	int err = -ENOBUFS;  in rtmsg_fib()
522 	skb = nlmsg_new(fib_nlmsg_size(fa->fa_info), GFP_KERNEL);  in rtmsg_fib()
526 	fri.fi = fa->fa_info;  in rtmsg_fib()
530 	fri.dscp = fa->fa_dscp;  in rtmsg_fib()
531 	fri.type = fa->fa_type;  in rtmsg_fib()
532 	fri.offload = READ_ONCE(fa->offload);  in rtmsg_fib()
533 	fri.trap = READ_ONCE(fa->trap);  in rtmsg_fib()
534 	fri.offload_failed = READ_ONCE(fa->offload_failed);  in rtmsg_fib()
535 	err = fib_dump_info(skb, info->portid, seq, event, &fri, nlm_flags);  in rtmsg_fib()
537 		/* -EMSGSIZE implies BUG in fib_nlmsg_size() */  in rtmsg_fib()
538 		WARN_ON(err == -EMSGSIZE);  in rtmsg_fib()
542 	rtnl_notify(skb, info->nl_net, info->portid, RTNLGRP_IPV4_ROUTE,  in rtmsg_fib()
543 		    info->nlh, GFP_KERNEL);  in rtmsg_fib()
546 	rtnl_set_sk_err(info->nl_net, RTNLGRP_IPV4_ROUTE, err);  in rtmsg_fib()
557 	if (likely(nhc->nhc_gw_family == AF_INET))  in fib_detect_death()
558 		n = neigh_lookup(&arp_tbl, &nhc->nhc_gw.ipv4, nhc->nhc_dev);  in fib_detect_death()
559 	else if (nhc->nhc_gw_family == AF_INET6)  in fib_detect_death()
560 		n = neigh_lookup(ipv6_stub->nd_tbl, &nhc->nhc_gw.ipv6,  in fib_detect_death()
561 				 nhc->nhc_dev);  in fib_detect_death()
566 		state = READ_ONCE(n->nud_state);  in fib_detect_death()
590 	nhc->nhc_pcpu_rth_output = alloc_percpu_gfp(struct rtable __rcu *,  in fib_nh_common_init()
592 	if (!nhc->nhc_pcpu_rth_output)  in fib_nh_common_init()
593 		return -ENOMEM;  in fib_nh_common_init()
600 			err = -EINVAL;  in fib_nh_common_init()
604 					   nhc->nhc_family, cfg, &lwtstate,  in fib_nh_common_init()
609 		nhc->nhc_lwtstate = lwtstate_get(lwtstate);  in fib_nh_common_init()
615 	rt_fibinfo_free_cpus(nhc->nhc_pcpu_rth_output);  in fib_nh_common_init()
616 	nhc->nhc_pcpu_rth_output = NULL;  in fib_nh_common_init()
627 	nh->fib_nh_family = AF_INET;  in fib_nh_init()
629 	err = fib_nh_common_init(net, &nh->nh_common, cfg->fc_encap,  in fib_nh_init()
630 				 cfg->fc_encap_type, cfg, GFP_KERNEL, extack);  in fib_nh_init()
634 	nh->fib_nh_oif = cfg->fc_oif;  in fib_nh_init()
635 	nh->fib_nh_gw_family = cfg->fc_gw_family;  in fib_nh_init()
636 	if (cfg->fc_gw_family == AF_INET)  in fib_nh_init()
637 		nh->fib_nh_gw4 = cfg->fc_gw4;  in fib_nh_init()
638 	else if (cfg->fc_gw_family == AF_INET6)  in fib_nh_init()
639 		nh->fib_nh_gw6 = cfg->fc_gw6;  in fib_nh_init()
641 	nh->fib_nh_flags = cfg->fc_flags;  in fib_nh_init()
644 	nh->nh_tclassid = cfg->fc_flow;  in fib_nh_init()
645 	if (nh->nh_tclassid)  in fib_nh_init()
646 		atomic_inc(&net->ipv4.fib_num_tclassid_users);  in fib_nh_init()
649 	nh->fib_nh_weight = nh_weight;  in fib_nh_init()
669 			       "Invalid nexthop configuration - extra data after nexthops");  in fib_count_nexthops()
681 		return -EINVAL;  in fib_gw_from_attr()
694 	struct net *net = fi->fib_net;  in fib_get_nhs()
706 				       "Invalid nexthop configuration - extra data after nexthop");  in fib_get_nhs()
707 			return -EINVAL;  in fib_get_nhs()
710 		if (rtnh->rtnh_flags & (RTNH_F_DEAD | RTNH_F_LINKDOWN)) {  in fib_get_nhs()
712 				       "Invalid flags for nexthop - can not contain DEAD or LINKDOWN");  in fib_get_nhs()
713 			return -EINVAL;  in fib_get_nhs()
716 		fib_cfg.fc_flags = (cfg->fc_flags & ~0xFF) | rtnh->rtnh_flags;  in fib_get_nhs()
717 		fib_cfg.fc_oif = rtnh->rtnh_ifindex;  in fib_get_nhs()
728 				return -EINVAL;  in fib_get_nhs()
748 					return -EINVAL;  in fib_get_nhs()
763 				  rtnh->rtnh_hops + 1, extack);  in fib_get_nhs()
770 	ret = -EINVAL;  in fib_get_nhs()
772 	if (cfg->fc_oif && nh->fib_nh_oif != cfg->fc_oif) {  in fib_get_nhs()
777 	if (cfg->fc_gw_family) {  in fib_get_nhs()
778 		if (cfg->fc_gw_family != nh->fib_nh_gw_family ||  in fib_get_nhs()
779 		    (cfg->fc_gw_family == AF_INET &&  in fib_get_nhs()
780 		     nh->fib_nh_gw4 != cfg->fc_gw4) ||  in fib_get_nhs()
781 		    (cfg->fc_gw_family == AF_INET6 &&  in fib_get_nhs()
782 		     ipv6_addr_cmp(&nh->fib_nh_gw6, &cfg->fc_gw6))) {  in fib_get_nhs()
789 	if (cfg->fc_flow && nh->nh_tclassid != cfg->fc_flow) {  in fib_get_nhs()
811 		if (nh->fib_nh_flags & RTNH_F_DEAD)  in fib_rebalance()
814 		if (ip_ignore_linkdown(nh->fib_nh_dev) &&  in fib_rebalance()
815 		    nh->fib_nh_flags & RTNH_F_LINKDOWN)  in fib_rebalance()
818 		total += nh->fib_nh_weight;  in fib_rebalance()
825 		if (nexthop_nh->fib_nh_flags & RTNH_F_DEAD) {  in fib_rebalance()
826 			upper_bound = -1;  in fib_rebalance()
827 		} else if (ip_ignore_linkdown(nexthop_nh->fib_nh_dev) &&  in fib_rebalance()
828 			   nexthop_nh->fib_nh_flags & RTNH_F_LINKDOWN) {  in fib_rebalance()
829 			upper_bound = -1;  in fib_rebalance()
831 			w += nexthop_nh->fib_nh_weight;  in fib_rebalance()
833 							    total) - 1;  in fib_rebalance()
836 		atomic_set(&nexthop_nh->fib_nh_upper_bound, upper_bound);  in fib_rebalance()
847 	return -EINVAL;  in fib_get_nhs()
869 		result = lwtunnel_cmp_encap(lwtstate, nh->fib_nh_lws);  in fib_encap_match()
884 	if (cfg->fc_priority && cfg->fc_priority != fi->fib_priority)  in fib_nh_match()
887 	if (cfg->fc_nh_id) {  in fib_nh_match()
888 		if (fi->nh && cfg->fc_nh_id == fi->nh->id)  in fib_nh_match()
893 	if (fi->nh) {  in fib_nh_match()
894 		if (cfg->fc_oif || cfg->fc_gw_family || cfg->fc_mp)  in fib_nh_match()
899 	if (cfg->fc_oif || cfg->fc_gw_family) {  in fib_nh_match()
903 		if (cfg->fc_encap) {  in fib_nh_match()
904 			if (fib_encap_match(net, cfg->fc_encap_type,  in fib_nh_match()
905 					    cfg->fc_encap, nh, cfg, extack))  in fib_nh_match()
909 		if (cfg->fc_flow &&  in fib_nh_match()
910 		    cfg->fc_flow != nh->nh_tclassid)  in fib_nh_match()
913 		if ((cfg->fc_oif && cfg->fc_oif != nh->fib_nh_oif) ||  in fib_nh_match()
914 		    (cfg->fc_gw_family &&  in fib_nh_match()
915 		     cfg->fc_gw_family != nh->fib_nh_gw_family))  in fib_nh_match()
918 		if (cfg->fc_gw_family == AF_INET &&  in fib_nh_match()
919 		    cfg->fc_gw4 != nh->fib_nh_gw4)  in fib_nh_match()
922 		if (cfg->fc_gw_family == AF_INET6 &&  in fib_nh_match()
923 		    ipv6_addr_cmp(&cfg->fc_gw6, &nh->fib_nh_gw6))  in fib_nh_match()
930 	if (!cfg->fc_mp)  in fib_nh_match()
933 	rtnh = cfg->fc_mp;  in fib_nh_match()
934 	remaining = cfg->fc_mp_len;  in fib_nh_match()
940 			return -EINVAL;  in fib_nh_match()
942 		if (rtnh->rtnh_ifindex && rtnh->rtnh_ifindex != nh->fib_nh_oif)  in fib_nh_match()
955 				return -EINVAL;  in fib_nh_match()
965 				if (nh->fib_nh_gw_family != AF_INET ||  in fib_nh_match()
966 				    gw != nh->fib_nh_gw4)  in fib_nh_match()
975 				switch (nh->fib_nh_gw_family) {  in fib_nh_match()
978 					    cfg2.fc_gw4 != nh->fib_nh_gw4)  in fib_nh_match()
984 							  &nh->fib_nh_gw6))  in fib_nh_match()
995 					return -EINVAL;  in fib_nh_match()
997 				if (nla_get_u32(nla) != nh->nh_tclassid)  in fib_nh_match()
1014 	if (!cfg->fc_mx)  in fib_metrics_match()
1017 	nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) {  in fib_metrics_match()
1039 		fi_val = fi->fib_metrics->metrics[type - 1];  in fib_metrics_match()
1055 		.fc_flags = nh->fib_nh_flags | RTF_GATEWAY,  in fib_check_nh_v6_gw()
1056 		.fc_ifindex = nh->fib_nh_oif,  in fib_check_nh_v6_gw()
1057 		.fc_gateway = nh->fib_nh_gw6,  in fib_check_nh_v6_gw()
1062 	err = ipv6_stub->fib6_nh_init(net, &fib6_nh, &cfg, GFP_KERNEL, extack);  in fib_check_nh_v6_gw()
1064 		nh->fib_nh_dev = fib6_nh.fib_nh_dev;  in fib_check_nh_v6_gw()
1065 		netdev_hold(nh->fib_nh_dev, &nh->fib_nh_dev_tracker,  in fib_check_nh_v6_gw()
1067 		nh->fib_nh_oif = nh->fib_nh_dev->ifindex;  in fib_check_nh_v6_gw()
1068 		nh->fib_nh_scope = RT_SCOPE_LINK;  in fib_check_nh_v6_gw()
1070 		ipv6_stub->fib6_nh_release(&fib6_nh);  in fib_check_nh_v6_gw()
1078  * -------
1084  * b) gateway must be on-link address, possibly
1088  * d) If we use tunnel routes, gateway could be not on-link.
1090  * Attempt to reconcile all of these (alas, self-contradictory) conditions
1107  * consistent and very flexible. F.e. as by-product it allows
1108  * to co-exists in peace independent exterior and interior
1113  * {universe prefix}  -> (gw, oif) [scope link]
1115  *		  |-> {link prefix} -> (gw, oif) [scope local]
1117  *					|-> {local prefix} (terminal node)
1126 	if (nh->fib_nh_flags & RTNH_F_ONLINK) {  in fib_check_nh_v4_gw()
1131 			return -EINVAL;  in fib_check_nh_v4_gw()
1133 		dev = __dev_get_by_index(net, nh->fib_nh_oif);  in fib_check_nh_v4_gw()
1136 			return -ENODEV;  in fib_check_nh_v4_gw()
1138 		if (!(dev->flags & IFF_UP)) {  in fib_check_nh_v4_gw()
1140 			return -ENETDOWN;  in fib_check_nh_v4_gw()
1142 		addr_type = inet_addr_type_dev_table(net, dev, nh->fib_nh_gw4);  in fib_check_nh_v4_gw()
1145 			return -EINVAL;  in fib_check_nh_v4_gw()
1148 			nh->fib_nh_flags |= RTNH_F_LINKDOWN;  in fib_check_nh_v4_gw()
1149 		nh->fib_nh_dev = dev;  in fib_check_nh_v4_gw()
1150 		netdev_hold(dev, &nh->fib_nh_dev_tracker, GFP_ATOMIC);  in fib_check_nh_v4_gw()
1151 		nh->fib_nh_scope = RT_SCOPE_LINK;  in fib_check_nh_v4_gw()
1158 			.daddr = nh->fib_nh_gw4,  in fib_check_nh_v4_gw()
1160 			.flowi4_oif = nh->fib_nh_oif,  in fib_check_nh_v4_gw()
1191 	err = -EINVAL;  in fib_check_nh_v4_gw()
1196 	nh->fib_nh_scope = res.scope;  in fib_check_nh_v4_gw()
1197 	nh->fib_nh_oif = FIB_RES_OIF(res);  in fib_check_nh_v4_gw()
1198 	nh->fib_nh_dev = dev = FIB_RES_DEV(res);  in fib_check_nh_v4_gw()
1204 	netdev_hold(dev, &nh->fib_nh_dev_tracker, GFP_ATOMIC);  in fib_check_nh_v4_gw()
1206 		nh->fib_nh_flags |= RTNH_F_LINKDOWN;  in fib_check_nh_v4_gw()
1207 	err = (dev->flags & IFF_UP) ? 0 : -ENETDOWN;  in fib_check_nh_v4_gw()
1219 	if (nh->fib_nh_flags & (RTNH_F_PERVASIVE | RTNH_F_ONLINK)) {  in fib_check_nh_nongw()
1221 			       "Invalid flags for nexthop - PERVASIVE and ONLINK can not be set");  in fib_check_nh_nongw()
1222 		return -EINVAL;  in fib_check_nh_nongw()
1227 	err = -ENODEV;  in fib_check_nh_nongw()
1228 	in_dev = inetdev_by_index(net, nh->fib_nh_oif);  in fib_check_nh_nongw()
1231 	err = -ENETDOWN;  in fib_check_nh_nongw()
1232 	if (!(in_dev->dev->flags & IFF_UP)) {  in fib_check_nh_nongw()
1237 	nh->fib_nh_dev = in_dev->dev;  in fib_check_nh_nongw()
1238 	netdev_hold(nh->fib_nh_dev, &nh->fib_nh_dev_tracker, GFP_ATOMIC);  in fib_check_nh_nongw()
1239 	nh->fib_nh_scope = RT_SCOPE_HOST;  in fib_check_nh_nongw()
1240 	if (!netif_carrier_ok(nh->fib_nh_dev))  in fib_check_nh_nongw()
1241 		nh->fib_nh_flags |= RTNH_F_LINKDOWN;  in fib_check_nh_nongw()
1253 	if (nh->fib_nh_gw_family == AF_INET)  in fib_check_nh()
1255 	else if (nh->fib_nh_gw_family == AF_INET6)  in fib_check_nh()
1297 			hlist_add_head(&fi->fib_hash, dest);  in fib_info_hash_move()
1311 			ldest = fib_info_laddrhash_bucket(fi->fib_net,  in fib_info_hash_move()
1312 							  fi->fib_prefsrc);  in fib_info_hash_move()
1313 			hlist_add_head(&fi->fib_lhash, ldest);  in fib_info_hash_move()
1329 	if (nhc->nhc_family != AF_INET)  in fib_info_update_nhc_saddr()
1330 		return inet_select_addr(nhc->nhc_dev, 0, scope);  in fib_info_update_nhc_saddr()
1333 	saddr = inet_select_addr(nh->fib_nh_dev, nh->fib_nh_gw4, scope);  in fib_info_update_nhc_saddr()
1335 	WRITE_ONCE(nh->nh_saddr, saddr);  in fib_info_update_nhc_saddr()
1336 	WRITE_ONCE(nh->nh_saddr_genid, atomic_read(&net->ipv4.dev_addr_genid));  in fib_info_update_nhc_saddr()
1343 	struct fib_nh_common *nhc = res->nhc;  in fib_result_prefsrc()
1345 	if (res->fi->fib_prefsrc)  in fib_result_prefsrc()
1346 		return res->fi->fib_prefsrc;  in fib_result_prefsrc()
1348 	if (nhc->nhc_family == AF_INET) {  in fib_result_prefsrc()
1352 		if (READ_ONCE(nh->nh_saddr_genid) ==  in fib_result_prefsrc()
1353 		    atomic_read(&net->ipv4.dev_addr_genid))  in fib_result_prefsrc()
1354 			return READ_ONCE(nh->nh_saddr);  in fib_result_prefsrc()
1357 	return fib_info_update_nhc_saddr(net, nhc, res->fi->fib_scope);  in fib_result_prefsrc()
1362 	if (cfg->fc_type != RTN_LOCAL || !cfg->fc_dst ||  in fib_valid_prefsrc()
1363 	    fib_prefsrc != cfg->fc_dst) {  in fib_valid_prefsrc()
1364 		u32 tb_id = cfg->fc_table;  in fib_valid_prefsrc()
1370 		rc = inet_addr_type_table(cfg->fc_nlinfo.nl_net,  in fib_valid_prefsrc()
1374 			rc = inet_addr_type_table(cfg->fc_nlinfo.nl_net,  in fib_valid_prefsrc()
1392 	struct net *net = cfg->fc_nlinfo.nl_net;  in fib_create_info()
1394 	if (cfg->fc_type > RTN_MAX)  in fib_create_info()
1398 	if (fib_props[cfg->fc_type].scope > cfg->fc_scope) {  in fib_create_info()
1403 	if (cfg->fc_flags & (RTNH_F_DEAD | RTNH_F_LINKDOWN)) {  in fib_create_info()
1405 			       "Invalid rtm_flags - can not contain DEAD or LINKDOWN");  in fib_create_info()
1409 	if (cfg->fc_nh_id) {  in fib_create_info()
1410 		if (!cfg->fc_mx) {  in fib_create_info()
1413 				refcount_inc(&fi->fib_treeref);  in fib_create_info()
1418 		nh = nexthop_find_by_id(net, cfg->fc_nh_id);  in fib_create_info()
1427 	if (cfg->fc_mp) {  in fib_create_info()
1428 		nhs = fib_count_nexthops(cfg->fc_mp, cfg->fc_mp_len, extack);  in fib_create_info()
1434 	err = -ENOBUFS;  in fib_create_info()
1461 	fi->fib_metrics = ip_fib_metrics_init(cfg->fc_mx, cfg->fc_mx_len, extack);  in fib_create_info()
1462 	if (IS_ERR(fi->fib_metrics)) {  in fib_create_info()
1463 		err = PTR_ERR(fi->fib_metrics);  in fib_create_info()
1468 	fi->fib_net = net;  in fib_create_info()
1469 	fi->fib_protocol = cfg->fc_protocol;  in fib_create_info()
1470 	fi->fib_scope = cfg->fc_scope;  in fib_create_info()
1471 	fi->fib_flags = cfg->fc_flags;  in fib_create_info()
1472 	fi->fib_priority = cfg->fc_priority;  in fib_create_info()
1473 	fi->fib_prefsrc = cfg->fc_prefsrc;  in fib_create_info()
1474 	fi->fib_type = cfg->fc_type;  in fib_create_info()
1475 	fi->fib_tb_id = cfg->fc_table;  in fib_create_info()
1477 	fi->fib_nhs = nhs;  in fib_create_info()
1481 			err = -EINVAL;  in fib_create_info()
1484 			fi->nh = nh;  in fib_create_info()
1488 			nexthop_nh->nh_parent = fi;  in fib_create_info()
1491 		if (cfg->fc_mp)  in fib_create_info()
1492 			err = fib_get_nhs(fi, cfg->fc_mp, cfg->fc_mp_len, cfg,  in fib_create_info()
1495 			err = fib_nh_init(net, fi->fib_nh, cfg, 1, extack);  in fib_create_info()
1501 	if (fib_props[cfg->fc_type].error) {  in fib_create_info()
1502 		if (cfg->fc_gw_family || cfg->fc_oif || cfg->fc_mp) {  in fib_create_info()
1509 		switch (cfg->fc_type) {  in fib_create_info()
1522 	if (cfg->fc_scope > RT_SCOPE_HOST) {  in fib_create_info()
1527 	if (fi->nh) {  in fib_create_info()
1528 		err = fib_check_nexthop(fi->nh, cfg->fc_scope, extack);  in fib_create_info()
1531 	} else if (cfg->fc_scope == RT_SCOPE_HOST) {  in fib_create_info()
1532 		struct fib_nh *nh = fi->fib_nh;  in fib_create_info()
1540 		if (nh->fib_nh_gw_family) {  in fib_create_info()
1545 		nh->fib_nh_scope = RT_SCOPE_NOWHERE;  in fib_create_info()
1546 		nh->fib_nh_dev = dev_get_by_index(net, nh->fib_nh_oif);  in fib_create_info()
1547 		err = -ENODEV;  in fib_create_info()
1548 		if (!nh->fib_nh_dev)  in fib_create_info()
1550 		netdev_tracker_alloc(nh->fib_nh_dev, &nh->fib_nh_dev_tracker,  in fib_create_info()
1556 			err = fib_check_nh(cfg->fc_nlinfo.nl_net, nexthop_nh,  in fib_create_info()
1557 					   cfg->fc_table, cfg->fc_scope,  in fib_create_info()
1561 			if (nexthop_nh->fib_nh_flags & RTNH_F_LINKDOWN)  in fib_create_info()
1564 		if (linkdown == fi->fib_nhs)  in fib_create_info()
1565 			fi->fib_flags |= RTNH_F_LINKDOWN;  in fib_create_info()
1568 	if (fi->fib_prefsrc && !fib_valid_prefsrc(cfg, fi->fib_prefsrc)) {  in fib_create_info()
1573 	if (!fi->nh) {  in fib_create_info()
1575 			fib_info_update_nhc_saddr(net, &nexthop_nh->nh_common,  in fib_create_info()
1576 						  fi->fib_scope);  in fib_create_info()
1577 			if (nexthop_nh->fib_nh_gw_family == AF_INET6)  in fib_create_info()
1578 				fi->fib_nh_is_v6 = true;  in fib_create_info()
1588 		fi->fib_dead = 1;  in fib_create_info()
1590 		refcount_inc(&ofi->fib_treeref);  in fib_create_info()
1594 	refcount_set(&fi->fib_treeref, 1);  in fib_create_info()
1595 	refcount_set(&fi->fib_clntref, 1);  in fib_create_info()
1598 	hlist_add_head(&fi->fib_hash,  in fib_create_info()
1600 	if (fi->fib_prefsrc) {  in fib_create_info()
1603 		head = fib_info_laddrhash_bucket(net, fi->fib_prefsrc);  in fib_create_info()
1604 		hlist_add_head(&fi->fib_lhash, head);  in fib_create_info()
1606 	if (fi->nh) {  in fib_create_info()
1607 		list_add(&fi->nh_list, &nh->fi_list);  in fib_create_info()
1612 			if (!nexthop_nh->fib_nh_dev)  in fib_create_info()
1614 			head = fib_info_devhash_bucket(nexthop_nh->fib_nh_dev);  in fib_create_info()
1615 			hlist_add_head(&nexthop_nh->nh_hash, head);  in fib_create_info()
1622 	err = -EINVAL;  in fib_create_info()
1627 		fi->fib_dead = 1;  in fib_create_info()
1637 	if (nhc->nhc_flags & RTNH_F_DEAD)  in fib_nexthop_info()
1640 	if (nhc->nhc_flags & RTNH_F_LINKDOWN) {  in fib_nexthop_info()
1644 		switch (nhc->nhc_family) {  in fib_nexthop_info()
1646 			if (ip_ignore_linkdown(nhc->nhc_dev))  in fib_nexthop_info()
1650 			if (ip6_ignore_linkdown(nhc->nhc_dev))  in fib_nexthop_info()
1657 	switch (nhc->nhc_gw_family) {  in fib_nexthop_info()
1659 		if (nla_put_in_addr(skb, RTA_GATEWAY, nhc->nhc_gw.ipv4))  in fib_nexthop_info()
1666 		if (rt_family != nhc->nhc_gw_family) {  in fib_nexthop_info()
1676 			via->rtvia_family = AF_INET6;  in fib_nexthop_info()
1677 			memcpy(via->rtvia_addr, &nhc->nhc_gw.ipv6, alen);  in fib_nexthop_info()
1679 					    &nhc->nhc_gw.ipv6) < 0) {  in fib_nexthop_info()
1685 	*flags |= (nhc->nhc_flags &  in fib_nexthop_info()
1688 	if (!skip_oif && nhc->nhc_dev &&  in fib_nexthop_info()
1689 	    nla_put_u32(skb, RTA_OIF, nhc->nhc_dev->ifindex))  in fib_nexthop_info()
1692 	if (nhc->nhc_lwtstate &&  in fib_nexthop_info()
1693 	    lwtunnel_fill_encap(skb, nhc->nhc_lwtstate,  in fib_nexthop_info()
1700 	return -EMSGSIZE;  in fib_nexthop_info()
1708 	const struct net_device *dev = nhc->nhc_dev;  in fib_add_nexthop()
1716 	rtnh->rtnh_hops = nh_weight - 1;  in fib_add_nexthop()
1717 	rtnh->rtnh_ifindex = dev ? dev->ifindex : 0;  in fib_add_nexthop()
1722 	rtnh->rtnh_flags = flags;  in fib_add_nexthop()
1728 	rtnh->rtnh_len = nlmsg_get_pos(skb) - (void *)rtnh;  in fib_add_nexthop()
1733 	return -EMSGSIZE;  in fib_add_nexthop()
1747 	if (unlikely(fi->nh)) {  in fib_add_multipath()
1748 		if (nexthop_mpath_fill_node(skb, fi->nh, AF_INET) < 0)  in fib_add_multipath()
1756 		nh_tclassid = nh->nh_tclassid;  in fib_add_multipath()
1758 		if (fib_add_nexthop(skb, &nh->nh_common, nh->fib_nh_weight,  in fib_add_multipath()
1769 	return -EMSGSIZE;  in fib_add_multipath()
1781 	unsigned int nhs = fib_info_num_path(fri->fi);  in fib_dump_info()
1782 	struct fib_info *fi = fri->fi;  in fib_dump_info()
1783 	u32 tb_id = fri->tb_id;  in fib_dump_info()
1785 	struct rtmsg *rtm;  in fib_dump_info()  local
1787 	nlh = nlmsg_put(skb, portid, seq, event, sizeof(*rtm), flags);  in fib_dump_info()
1789 		return -EMSGSIZE;  in fib_dump_info()
1791 	rtm = nlmsg_data(nlh);  in fib_dump_info()
1792 	rtm->rtm_family = AF_INET;  in fib_dump_info()
1793 	rtm->rtm_dst_len = fri->dst_len;  in fib_dump_info()
1794 	rtm->rtm_src_len = 0;  in fib_dump_info()
1795 	rtm->rtm_tos = inet_dscp_to_dsfield(fri->dscp);  in fib_dump_info()
1797 		rtm->rtm_table = tb_id;  in fib_dump_info()
1799 		rtm->rtm_table = RT_TABLE_COMPAT;  in fib_dump_info()
1802 	rtm->rtm_type = fri->type;  in fib_dump_info()
1803 	rtm->rtm_flags = fi->fib_flags;  in fib_dump_info()
1804 	rtm->rtm_scope = fi->fib_scope;  in fib_dump_info()
1805 	rtm->rtm_protocol = fi->fib_protocol;  in fib_dump_info()
1807 	if (rtm->rtm_dst_len &&  in fib_dump_info()
1808 	    nla_put_in_addr(skb, RTA_DST, fri->dst))  in fib_dump_info()
1810 	if (fi->fib_priority &&  in fib_dump_info()
1811 	    nla_put_u32(skb, RTA_PRIORITY, fi->fib_priority))  in fib_dump_info()
1813 	if (rtnetlink_put_metrics(skb, fi->fib_metrics->metrics) < 0)  in fib_dump_info()
1816 	if (fi->fib_prefsrc &&  in fib_dump_info()
1817 	    nla_put_in_addr(skb, RTA_PREFSRC, fi->fib_prefsrc))  in fib_dump_info()
1820 	if (fi->nh) {  in fib_dump_info()
1821 		if (nla_put_u32(skb, RTA_NH_ID, fi->nh->id))  in fib_dump_info()
1823 		if (nexthop_is_blackhole(fi->nh))  in fib_dump_info()
1824 			rtm->rtm_type = RTN_BLACKHOLE;  in fib_dump_info()
1825 		if (!READ_ONCE(fi->fib_net->ipv4.sysctl_nexthop_compat_mode))  in fib_dump_info()
1836 		rtm->rtm_flags = flags;  in fib_dump_info()
1838 		if (nhc->nhc_family == AF_INET) {  in fib_dump_info()
1842 			if (nh->nh_tclassid &&  in fib_dump_info()
1843 			    nla_put_u32(skb, RTA_FLOW, nh->nh_tclassid))  in fib_dump_info()
1853 	if (fri->offload)  in fib_dump_info()
1854 		rtm->rtm_flags |= RTM_F_OFFLOAD;  in fib_dump_info()
1855 	if (fri->trap)  in fib_dump_info()
1856 		rtm->rtm_flags |= RTM_F_TRAP;  in fib_dump_info()
1857 	if (fri->offload_failed)  in fib_dump_info()
1858 		rtm->rtm_flags |= RTM_F_OFFLOAD_FAILED;  in fib_dump_info()
1865 	return -EMSGSIZE;  in fib_dump_info()
1870  * - local address disappeared -> we must delete all the entries
1872  * - device went down -> we must shutdown all nexthops going via it.
1887 		if (!net_eq(fi->fib_net, net) ||  in fib_sync_down_addr()
1888 		    fi->fib_tb_id != tb_id)  in fib_sync_down_addr()
1890 		if (fi->fib_prefsrc == local) {  in fib_sync_down_addr()
1891 			fi->fib_flags |= RTNH_F_DEAD;  in fib_sync_down_addr()
1892 			fi->pfsrc_removed = true;  in fib_sync_down_addr()
1902 	bool ignore_link_down = ip_ignore_linkdown(nh->fib_nh_dev);  in call_fib_nh_notifiers()
1909 		if (nh->fib_nh_flags & RTNH_F_DEAD)  in call_fib_nh_notifiers()
1911 		if (ignore_link_down && nh->fib_nh_flags & RTNH_F_LINKDOWN)  in call_fib_nh_notifiers()
1913 		return call_fib4_notifiers(dev_net(nh->fib_nh_dev), event_type,  in call_fib_nh_notifiers()
1916 		if ((ignore_link_down && nh->fib_nh_flags & RTNH_F_LINKDOWN) ||  in call_fib_nh_notifiers()
1917 		    (nh->fib_nh_flags & RTNH_F_DEAD))  in call_fib_nh_notifiers()
1918 			return call_fib4_notifiers(dev_net(nh->fib_nh_dev),  in call_fib_nh_notifiers()
1929  * - the new MTU of the first hop becomes smaller than the PMTU
1930  * - the old MTU was the same as the PMTU, and it limited discovery of
1935  * - if the new MTU is greater than the PMTU, don't make any change
1936  * - otherwise, unlock and set PMTU
1943 	bucket = rcu_dereference_protected(nhc->nhc_exceptions, 1);  in fib_nhc_update_mtu()
1952 		     fnhe = rcu_dereference_protected(fnhe->fnhe_next, 1)) {  in fib_nhc_update_mtu()
1953 			if (fnhe->fnhe_mtu_locked) {  in fib_nhc_update_mtu()
1954 				if (new <= fnhe->fnhe_pmtu) {  in fib_nhc_update_mtu()
1955 					fnhe->fnhe_pmtu = new;  in fib_nhc_update_mtu()
1956 					fnhe->fnhe_mtu_locked = false;  in fib_nhc_update_mtu()
1958 			} else if (new < fnhe->fnhe_pmtu ||  in fib_nhc_update_mtu()
1959 				   orig == fnhe->fnhe_pmtu) {  in fib_nhc_update_mtu()
1960 				fnhe->fnhe_pmtu = new;  in fib_nhc_update_mtu()
1972 		if (nh->fib_nh_dev == dev)  in fib_sync_mtu()
1973 			fib_nhc_update_mtu(&nh->nh_common, dev->mtu, orig_mtu);  in fib_sync_mtu()
1994 		scope = -1;  in fib_sync_down_dev()
1997 		struct fib_info *fi = nh->nh_parent;  in fib_sync_down_dev()
2000 		BUG_ON(!fi->fib_nhs);  in fib_sync_down_dev()
2001 		if (nh->fib_nh_dev != dev || fi == prev_fi)  in fib_sync_down_dev()
2006 			if (nexthop_nh->fib_nh_flags & RTNH_F_DEAD)  in fib_sync_down_dev()
2008 			else if (nexthop_nh->fib_nh_dev == dev &&  in fib_sync_down_dev()
2009 				 nexthop_nh->fib_nh_scope != scope) {  in fib_sync_down_dev()
2013 					nexthop_nh->fib_nh_flags |= RTNH_F_DEAD;  in fib_sync_down_dev()
2016 					nexthop_nh->fib_nh_flags |= RTNH_F_LINKDOWN;  in fib_sync_down_dev()
2025 			    nexthop_nh->fib_nh_dev == dev) {  in fib_sync_down_dev()
2026 				dead = fi->fib_nhs;  in fib_sync_down_dev()
2031 		if (dead == fi->fib_nhs) {  in fib_sync_down_dev()
2035 				fi->fib_flags |= RTNH_F_DEAD;  in fib_sync_down_dev()
2038 				fi->fib_flags |= RTNH_F_LINKDOWN;  in fib_sync_down_dev()
2054 	struct hlist_head *fa_head = res->fa_head;  in fib_select_default()
2055 	struct fib_table *tb = res->table;  in fib_select_default()
2056 	u8 slen = 32 - res->prefixlen;  in fib_select_default()
2057 	int order = -1, last_idx = -1;  in fib_select_default()
2059 	u32 last_prio = res->fi->fib_priority;  in fib_select_default()
2063 		struct fib_info *next_fi = fa->fa_info;  in fib_select_default()
2066 		if (fa->fa_slen != slen)  in fib_select_default()
2068 		if (fa->fa_dscp && !fib_dscp_masked_match(fa->fa_dscp, flp))  in fib_select_default()
2070 		if (fa->tb_id != tb->tb_id)  in fib_select_default()
2072 		if (next_fi->fib_priority > last_prio &&  in fib_select_default()
2073 		    fa->fa_dscp == last_dscp) {  in fib_select_default()
2078 		if (next_fi->fib_flags & RTNH_F_DEAD)  in fib_select_default()
2080 		last_dscp = fa->fa_dscp;  in fib_select_default()
2081 		last_prio = next_fi->fib_priority;  in fib_select_default()
2083 		if (next_fi->fib_scope != res->scope ||  in fib_select_default()
2084 		    fa->fa_type != RTN_UNICAST)  in fib_select_default()
2088 		if (!nhc->nhc_gw_family || nhc->nhc_scope != RT_SCOPE_LINK)  in fib_select_default()
2094 			if (next_fi != res->fi)  in fib_select_default()
2098 					     &last_idx, fa1->fa_default)) {  in fib_select_default()
2100 			fa1->fa_default = order;  in fib_select_default()
2109 			fa1->fa_default = -1;  in fib_select_default()
2114 			      fa1->fa_default)) {  in fib_select_default()
2116 		fa1->fa_default = order;  in fib_select_default()
2122 	fa1->fa_default = last_idx;  in fib_select_default()
2140 	if (!(dev->flags & IFF_UP))  in fib_sync_up()
2155 		struct fib_info *fi = nh->nh_parent;  in fib_sync_up()
2158 		BUG_ON(!fi->fib_nhs);  in fib_sync_up()
2159 		if (nh->fib_nh_dev != dev || fi == prev_fi)  in fib_sync_up()
2165 			if (!(nexthop_nh->fib_nh_flags & nh_flags)) {  in fib_sync_up()
2169 			if (!nexthop_nh->fib_nh_dev ||  in fib_sync_up()
2170 			    !(nexthop_nh->fib_nh_dev->flags & IFF_UP))  in fib_sync_up()
2172 			if (nexthop_nh->fib_nh_dev != dev ||  in fib_sync_up()
2176 			nexthop_nh->fib_nh_flags &= ~nh_flags;  in fib_sync_up()
2181 			fi->fib_flags &= ~nh_flags;  in fib_sync_up()
2196 	if (nh->fib_nh_scope == RT_SCOPE_LINK) {  in fib_good_nh()
2201 		if (likely(nh->fib_nh_gw_family == AF_INET))  in fib_good_nh()
2202 			n = __ipv4_neigh_lookup_noref(nh->fib_nh_dev,  in fib_good_nh()
2203 						   (__force u32)nh->fib_nh_gw4);  in fib_good_nh()
2204 		else if (nh->fib_nh_gw_family == AF_INET6)  in fib_good_nh()
2205 			n = __ipv6_neigh_lookup_noref_stub(nh->fib_nh_dev,  in fib_good_nh()
2206 							   &nh->fib_nh_gw6);  in fib_good_nh()
2210 			state = READ_ONCE(n->nud_state);  in fib_good_nh()
2220 	struct fib_info *fi = res->fi;  in fib_select_multipath()
2221 	struct net *net = fi->fib_net;  in fib_select_multipath()
2224 	if (unlikely(res->fi->nh)) {  in fib_select_multipath()
2230 		if (READ_ONCE(net->ipv4.sysctl_fib_multipath_use_neigh)) {  in fib_select_multipath()
2234 				res->nh_sel = nhsel;  in fib_select_multipath()
2235 				res->nhc = &nexthop_nh->nh_common;  in fib_select_multipath()
2240 		if (hash > atomic_read(&nexthop_nh->fib_nh_upper_bound))  in fib_select_multipath()
2243 		res->nh_sel = nhsel;  in fib_select_multipath()
2244 		res->nhc = &nexthop_nh->nh_common;  in fib_select_multipath()
2253 	if (fl4->flowi4_oif)  in fib_select_path()
2257 	if (fib_info_num_path(res->fi) > 1) {  in fib_select_path()
2264 	if (!res->prefixlen &&  in fib_select_path()
2265 	    res->table->tb_num_default > 1 &&  in fib_select_path()
2266 	    res->type == RTN_UNICAST)  in fib_select_path()
2270 	if (!fl4->saddr) {  in fib_select_path()
2273 		l3mdev = dev_get_by_index_rcu(net, fl4->flowi4_l3mdev);  in fib_select_path()
2277 			fl4->saddr = fib_result_prefsrc(net, res);  in fib_select_path()
2279 			fl4->saddr = inet_select_addr(l3mdev, 0, RT_SCOPE_LINK);  in fib_select_path()