1ab84be7eSDavid Ahern // SPDX-License-Identifier: GPL-2.0 2ab84be7eSDavid Ahern /* Generic nexthop implementation 3ab84be7eSDavid Ahern * 4ab84be7eSDavid Ahern * Copyright (c) 2017-19 Cumulus Networks 5ab84be7eSDavid Ahern * Copyright (c) 2017-19 David Ahern <dsa@cumulusnetworks.com> 6ab84be7eSDavid Ahern */ 7ab84be7eSDavid Ahern 8ab84be7eSDavid Ahern #include <linux/nexthop.h> 9ab84be7eSDavid Ahern #include <linux/rtnetlink.h> 10ab84be7eSDavid Ahern #include <linux/slab.h> 11430a0491SDavid Ahern #include <net/arp.h> 1253010f99SDavid Ahern #include <net/ipv6_stubs.h> 13b513bd03SDavid Ahern #include <net/lwtunnel.h> 14430a0491SDavid Ahern #include <net/ndisc.h> 15ab84be7eSDavid Ahern #include <net/nexthop.h> 16597cfe4fSDavid Ahern #include <net/route.h> 17ab84be7eSDavid Ahern #include <net/sock.h> 18ab84be7eSDavid Ahern 19430a0491SDavid Ahern static void remove_nexthop(struct net *net, struct nexthop *nh, 20430a0491SDavid Ahern struct nl_info *nlinfo); 21430a0491SDavid Ahern 22597cfe4fSDavid Ahern #define NH_DEV_HASHBITS 8 23597cfe4fSDavid Ahern #define NH_DEV_HASHSIZE (1U << NH_DEV_HASHBITS) 24597cfe4fSDavid Ahern 25ab84be7eSDavid Ahern static const struct nla_policy rtm_nh_policy[NHA_MAX + 1] = { 26ab84be7eSDavid Ahern [NHA_ID] = { .type = NLA_U32 }, 27ab84be7eSDavid Ahern [NHA_GROUP] = { .type = NLA_BINARY }, 28ab84be7eSDavid Ahern [NHA_GROUP_TYPE] = { .type = NLA_U16 }, 29ab84be7eSDavid Ahern [NHA_BLACKHOLE] = { .type = NLA_FLAG }, 30ab84be7eSDavid Ahern [NHA_OIF] = { .type = NLA_U32 }, 31ab84be7eSDavid Ahern [NHA_GATEWAY] = { .type = NLA_BINARY }, 32ab84be7eSDavid Ahern [NHA_ENCAP_TYPE] = { .type = NLA_U16 }, 33ab84be7eSDavid Ahern [NHA_ENCAP] = { .type = NLA_NESTED }, 34ab84be7eSDavid Ahern [NHA_GROUPS] = { .type = NLA_FLAG }, 35ab84be7eSDavid Ahern [NHA_MASTER] = { .type = NLA_U32 }, 3638428d68SRoopa Prabhu [NHA_FDB] = { .type = NLA_FLAG }, 37ab84be7eSDavid Ahern }; 38ab84be7eSDavid Ahern 395ca474f2SIdo Schimmel static bool nexthop_notifiers_is_empty(struct net *net) 405ca474f2SIdo Schimmel { 415ca474f2SIdo Schimmel return !net->nexthop.notifier_chain.head; 425ca474f2SIdo Schimmel } 435ca474f2SIdo Schimmel 445ca474f2SIdo Schimmel static void 455ca474f2SIdo Schimmel __nh_notifier_single_info_init(struct nh_notifier_single_info *nh_info, 465ca474f2SIdo Schimmel const struct nexthop *nh) 475ca474f2SIdo Schimmel { 485ca474f2SIdo Schimmel struct nh_info *nhi = rtnl_dereference(nh->nh_info); 495ca474f2SIdo Schimmel 505ca474f2SIdo Schimmel nh_info->dev = nhi->fib_nhc.nhc_dev; 515ca474f2SIdo Schimmel nh_info->gw_family = nhi->fib_nhc.nhc_gw_family; 525ca474f2SIdo Schimmel if (nh_info->gw_family == AF_INET) 535ca474f2SIdo Schimmel nh_info->ipv4 = nhi->fib_nhc.nhc_gw.ipv4; 545ca474f2SIdo Schimmel else if (nh_info->gw_family == AF_INET6) 555ca474f2SIdo Schimmel nh_info->ipv6 = nhi->fib_nhc.nhc_gw.ipv6; 565ca474f2SIdo Schimmel 575ca474f2SIdo Schimmel nh_info->is_reject = nhi->reject_nh; 585ca474f2SIdo Schimmel nh_info->is_fdb = nhi->fdb_nh; 595ca474f2SIdo Schimmel nh_info->has_encap = !!nhi->fib_nhc.nhc_lwtstate; 605ca474f2SIdo Schimmel } 615ca474f2SIdo Schimmel 625ca474f2SIdo Schimmel static int nh_notifier_single_info_init(struct nh_notifier_info *info, 635ca474f2SIdo Schimmel const struct nexthop *nh) 645ca474f2SIdo Schimmel { 655ca474f2SIdo Schimmel info->nh = kzalloc(sizeof(*info->nh), GFP_KERNEL); 665ca474f2SIdo Schimmel if (!info->nh) 675ca474f2SIdo Schimmel return -ENOMEM; 685ca474f2SIdo Schimmel 695ca474f2SIdo Schimmel __nh_notifier_single_info_init(info->nh, nh); 705ca474f2SIdo Schimmel 715ca474f2SIdo Schimmel return 0; 725ca474f2SIdo Schimmel } 735ca474f2SIdo Schimmel 745ca474f2SIdo Schimmel static void nh_notifier_single_info_fini(struct nh_notifier_info *info) 755ca474f2SIdo Schimmel { 765ca474f2SIdo Schimmel kfree(info->nh); 775ca474f2SIdo Schimmel } 785ca474f2SIdo Schimmel 795ca474f2SIdo Schimmel static int nh_notifier_grp_info_init(struct nh_notifier_info *info, 805ca474f2SIdo Schimmel const struct nexthop *nh) 815ca474f2SIdo Schimmel { 825ca474f2SIdo Schimmel struct nh_group *nhg = rtnl_dereference(nh->nh_grp); 835ca474f2SIdo Schimmel u16 num_nh = nhg->num_nh; 845ca474f2SIdo Schimmel int i; 855ca474f2SIdo Schimmel 865ca474f2SIdo Schimmel info->nh_grp = kzalloc(struct_size(info->nh_grp, nh_entries, num_nh), 875ca474f2SIdo Schimmel GFP_KERNEL); 885ca474f2SIdo Schimmel if (!info->nh_grp) 895ca474f2SIdo Schimmel return -ENOMEM; 905ca474f2SIdo Schimmel 915ca474f2SIdo Schimmel info->nh_grp->num_nh = num_nh; 925ca474f2SIdo Schimmel info->nh_grp->is_fdb = nhg->fdb_nh; 935ca474f2SIdo Schimmel 945ca474f2SIdo Schimmel for (i = 0; i < num_nh; i++) { 955ca474f2SIdo Schimmel struct nh_grp_entry *nhge = &nhg->nh_entries[i]; 965ca474f2SIdo Schimmel 975ca474f2SIdo Schimmel info->nh_grp->nh_entries[i].id = nhge->nh->id; 985ca474f2SIdo Schimmel info->nh_grp->nh_entries[i].weight = nhge->weight; 995ca474f2SIdo Schimmel __nh_notifier_single_info_init(&info->nh_grp->nh_entries[i].nh, 1005ca474f2SIdo Schimmel nhge->nh); 1015ca474f2SIdo Schimmel } 1025ca474f2SIdo Schimmel 1035ca474f2SIdo Schimmel return 0; 1045ca474f2SIdo Schimmel } 1055ca474f2SIdo Schimmel 1065ca474f2SIdo Schimmel static void nh_notifier_grp_info_fini(struct nh_notifier_info *info) 1075ca474f2SIdo Schimmel { 1085ca474f2SIdo Schimmel kfree(info->nh_grp); 1095ca474f2SIdo Schimmel } 1105ca474f2SIdo Schimmel 1115ca474f2SIdo Schimmel static int nh_notifier_info_init(struct nh_notifier_info *info, 1125ca474f2SIdo Schimmel const struct nexthop *nh) 1135ca474f2SIdo Schimmel { 1145ca474f2SIdo Schimmel info->id = nh->id; 1155ca474f2SIdo Schimmel info->is_grp = nh->is_group; 1165ca474f2SIdo Schimmel 1175ca474f2SIdo Schimmel if (info->is_grp) 1185ca474f2SIdo Schimmel return nh_notifier_grp_info_init(info, nh); 1195ca474f2SIdo Schimmel else 1205ca474f2SIdo Schimmel return nh_notifier_single_info_init(info, nh); 1215ca474f2SIdo Schimmel } 1225ca474f2SIdo Schimmel 1235ca474f2SIdo Schimmel static void nh_notifier_info_fini(struct nh_notifier_info *info) 1245ca474f2SIdo Schimmel { 1255ca474f2SIdo Schimmel if (info->is_grp) 1265ca474f2SIdo Schimmel nh_notifier_grp_info_fini(info); 1275ca474f2SIdo Schimmel else 1285ca474f2SIdo Schimmel nh_notifier_single_info_fini(info); 1295ca474f2SIdo Schimmel } 1305ca474f2SIdo Schimmel 1318590ceedSRoopa Prabhu static int call_nexthop_notifiers(struct net *net, 132d8e79f1dSNathan Chancellor enum nexthop_event_type event_type, 1333578d53dSIdo Schimmel struct nexthop *nh, 1343578d53dSIdo Schimmel struct netlink_ext_ack *extack) 1358590ceedSRoopa Prabhu { 1365ca474f2SIdo Schimmel struct nh_notifier_info info = { 1375ca474f2SIdo Schimmel .net = net, 1385ca474f2SIdo Schimmel .extack = extack, 1395ca474f2SIdo Schimmel }; 1408590ceedSRoopa Prabhu int err; 1418590ceedSRoopa Prabhu 1425ca474f2SIdo Schimmel ASSERT_RTNL(); 1435ca474f2SIdo Schimmel 1445ca474f2SIdo Schimmel if (nexthop_notifiers_is_empty(net)) 1455ca474f2SIdo Schimmel return 0; 1465ca474f2SIdo Schimmel 1475ca474f2SIdo Schimmel err = nh_notifier_info_init(&info, nh); 1485ca474f2SIdo Schimmel if (err) { 1495ca474f2SIdo Schimmel NL_SET_ERR_MSG(extack, "Failed to initialize nexthop notifier info"); 1505ca474f2SIdo Schimmel return err; 1515ca474f2SIdo Schimmel } 1525ca474f2SIdo Schimmel 15380690ec6SIdo Schimmel err = blocking_notifier_call_chain(&net->nexthop.notifier_chain, 1541ec69d18SIdo Schimmel event_type, &info); 1555ca474f2SIdo Schimmel nh_notifier_info_fini(&info); 1565ca474f2SIdo Schimmel 1578590ceedSRoopa Prabhu return notifier_to_errno(err); 1588590ceedSRoopa Prabhu } 1598590ceedSRoopa Prabhu 160975ff7f3SIdo Schimmel static int call_nexthop_notifier(struct notifier_block *nb, struct net *net, 161975ff7f3SIdo Schimmel enum nexthop_event_type event_type, 162975ff7f3SIdo Schimmel struct nexthop *nh, 163975ff7f3SIdo Schimmel struct netlink_ext_ack *extack) 164975ff7f3SIdo Schimmel { 165975ff7f3SIdo Schimmel struct nh_notifier_info info = { 166975ff7f3SIdo Schimmel .net = net, 167975ff7f3SIdo Schimmel .extack = extack, 168975ff7f3SIdo Schimmel }; 169975ff7f3SIdo Schimmel int err; 170975ff7f3SIdo Schimmel 171975ff7f3SIdo Schimmel err = nh_notifier_info_init(&info, nh); 172975ff7f3SIdo Schimmel if (err) 173975ff7f3SIdo Schimmel return err; 174975ff7f3SIdo Schimmel 175975ff7f3SIdo Schimmel err = nb->notifier_call(nb, event_type, &info); 176975ff7f3SIdo Schimmel nh_notifier_info_fini(&info); 177975ff7f3SIdo Schimmel 178975ff7f3SIdo Schimmel return notifier_to_errno(err); 179975ff7f3SIdo Schimmel } 180975ff7f3SIdo Schimmel 181597cfe4fSDavid Ahern static unsigned int nh_dev_hashfn(unsigned int val) 182597cfe4fSDavid Ahern { 183597cfe4fSDavid Ahern unsigned int mask = NH_DEV_HASHSIZE - 1; 184597cfe4fSDavid Ahern 185597cfe4fSDavid Ahern return (val ^ 186597cfe4fSDavid Ahern (val >> NH_DEV_HASHBITS) ^ 187597cfe4fSDavid Ahern (val >> (NH_DEV_HASHBITS * 2))) & mask; 188597cfe4fSDavid Ahern } 189597cfe4fSDavid Ahern 190597cfe4fSDavid Ahern static void nexthop_devhash_add(struct net *net, struct nh_info *nhi) 191597cfe4fSDavid Ahern { 192597cfe4fSDavid Ahern struct net_device *dev = nhi->fib_nhc.nhc_dev; 193597cfe4fSDavid Ahern struct hlist_head *head; 194597cfe4fSDavid Ahern unsigned int hash; 195597cfe4fSDavid Ahern 196597cfe4fSDavid Ahern WARN_ON(!dev); 197597cfe4fSDavid Ahern 198597cfe4fSDavid Ahern hash = nh_dev_hashfn(dev->ifindex); 199597cfe4fSDavid Ahern head = &net->nexthop.devhash[hash]; 200597cfe4fSDavid Ahern hlist_add_head(&nhi->dev_hash, head); 201597cfe4fSDavid Ahern } 202597cfe4fSDavid Ahern 203430a0491SDavid Ahern static void nexthop_free_mpath(struct nexthop *nh) 204ab84be7eSDavid Ahern { 205430a0491SDavid Ahern struct nh_group *nhg; 206430a0491SDavid Ahern int i; 207430a0491SDavid Ahern 208430a0491SDavid Ahern nhg = rcu_dereference_raw(nh->nh_grp); 20990f33bffSNikolay Aleksandrov for (i = 0; i < nhg->num_nh; ++i) { 21090f33bffSNikolay Aleksandrov struct nh_grp_entry *nhge = &nhg->nh_entries[i]; 211430a0491SDavid Ahern 21290f33bffSNikolay Aleksandrov WARN_ON(!list_empty(&nhge->nh_list)); 21390f33bffSNikolay Aleksandrov nexthop_put(nhge->nh); 21490f33bffSNikolay Aleksandrov } 21590f33bffSNikolay Aleksandrov 21690f33bffSNikolay Aleksandrov WARN_ON(nhg->spare == nhg); 21790f33bffSNikolay Aleksandrov 21890f33bffSNikolay Aleksandrov kfree(nhg->spare); 219430a0491SDavid Ahern kfree(nhg); 220430a0491SDavid Ahern } 221430a0491SDavid Ahern 222430a0491SDavid Ahern static void nexthop_free_single(struct nexthop *nh) 223430a0491SDavid Ahern { 224ab84be7eSDavid Ahern struct nh_info *nhi; 225ab84be7eSDavid Ahern 226ab84be7eSDavid Ahern nhi = rcu_dereference_raw(nh->nh_info); 227597cfe4fSDavid Ahern switch (nhi->family) { 228597cfe4fSDavid Ahern case AF_INET: 229597cfe4fSDavid Ahern fib_nh_release(nh->net, &nhi->fib_nh); 230597cfe4fSDavid Ahern break; 23153010f99SDavid Ahern case AF_INET6: 23253010f99SDavid Ahern ipv6_stub->fib6_nh_release(&nhi->fib6_nh); 23353010f99SDavid Ahern break; 234597cfe4fSDavid Ahern } 235ab84be7eSDavid Ahern kfree(nhi); 236430a0491SDavid Ahern } 237430a0491SDavid Ahern 238430a0491SDavid Ahern void nexthop_free_rcu(struct rcu_head *head) 239430a0491SDavid Ahern { 240430a0491SDavid Ahern struct nexthop *nh = container_of(head, struct nexthop, rcu); 241430a0491SDavid Ahern 242430a0491SDavid Ahern if (nh->is_group) 243430a0491SDavid Ahern nexthop_free_mpath(nh); 244430a0491SDavid Ahern else 245430a0491SDavid Ahern nexthop_free_single(nh); 246ab84be7eSDavid Ahern 247ab84be7eSDavid Ahern kfree(nh); 248ab84be7eSDavid Ahern } 249ab84be7eSDavid Ahern EXPORT_SYMBOL_GPL(nexthop_free_rcu); 250ab84be7eSDavid Ahern 251ab84be7eSDavid Ahern static struct nexthop *nexthop_alloc(void) 252ab84be7eSDavid Ahern { 253ab84be7eSDavid Ahern struct nexthop *nh; 254ab84be7eSDavid Ahern 255ab84be7eSDavid Ahern nh = kzalloc(sizeof(struct nexthop), GFP_KERNEL); 256430a0491SDavid Ahern if (nh) { 2574c7e8084SDavid Ahern INIT_LIST_HEAD(&nh->fi_list); 258f88d8ea6SDavid Ahern INIT_LIST_HEAD(&nh->f6i_list); 259430a0491SDavid Ahern INIT_LIST_HEAD(&nh->grp_list); 26038428d68SRoopa Prabhu INIT_LIST_HEAD(&nh->fdb_list); 261430a0491SDavid Ahern } 262ab84be7eSDavid Ahern return nh; 263ab84be7eSDavid Ahern } 264ab84be7eSDavid Ahern 265430a0491SDavid Ahern static struct nh_group *nexthop_grp_alloc(u16 num_nh) 266430a0491SDavid Ahern { 267430a0491SDavid Ahern struct nh_group *nhg; 268430a0491SDavid Ahern 269d7d49dc7SIdo Schimmel nhg = kzalloc(struct_size(nhg, nh_entries, num_nh), GFP_KERNEL); 270430a0491SDavid Ahern if (nhg) 271430a0491SDavid Ahern nhg->num_nh = num_nh; 272430a0491SDavid Ahern 273430a0491SDavid Ahern return nhg; 274430a0491SDavid Ahern } 275430a0491SDavid Ahern 276ab84be7eSDavid Ahern static void nh_base_seq_inc(struct net *net) 277ab84be7eSDavid Ahern { 278ab84be7eSDavid Ahern while (++net->nexthop.seq == 0) 279ab84be7eSDavid Ahern ; 280ab84be7eSDavid Ahern } 281ab84be7eSDavid Ahern 282ab84be7eSDavid Ahern /* no reference taken; rcu lock or rtnl must be held */ 283ab84be7eSDavid Ahern struct nexthop *nexthop_find_by_id(struct net *net, u32 id) 284ab84be7eSDavid Ahern { 285ab84be7eSDavid Ahern struct rb_node **pp, *parent = NULL, *next; 286ab84be7eSDavid Ahern 287ab84be7eSDavid Ahern pp = &net->nexthop.rb_root.rb_node; 288ab84be7eSDavid Ahern while (1) { 289ab84be7eSDavid Ahern struct nexthop *nh; 290ab84be7eSDavid Ahern 291ab84be7eSDavid Ahern next = rcu_dereference_raw(*pp); 292ab84be7eSDavid Ahern if (!next) 293ab84be7eSDavid Ahern break; 294ab84be7eSDavid Ahern parent = next; 295ab84be7eSDavid Ahern 296ab84be7eSDavid Ahern nh = rb_entry(parent, struct nexthop, rb_node); 297ab84be7eSDavid Ahern if (id < nh->id) 298ab84be7eSDavid Ahern pp = &next->rb_left; 299ab84be7eSDavid Ahern else if (id > nh->id) 300ab84be7eSDavid Ahern pp = &next->rb_right; 301ab84be7eSDavid Ahern else 302ab84be7eSDavid Ahern return nh; 303ab84be7eSDavid Ahern } 304ab84be7eSDavid Ahern return NULL; 305ab84be7eSDavid Ahern } 306ab84be7eSDavid Ahern EXPORT_SYMBOL_GPL(nexthop_find_by_id); 307ab84be7eSDavid Ahern 308ab84be7eSDavid Ahern /* used for auto id allocation; called with rtnl held */ 309ab84be7eSDavid Ahern static u32 nh_find_unused_id(struct net *net) 310ab84be7eSDavid Ahern { 311ab84be7eSDavid Ahern u32 id_start = net->nexthop.last_id_allocated; 312ab84be7eSDavid Ahern 313ab84be7eSDavid Ahern while (1) { 314ab84be7eSDavid Ahern net->nexthop.last_id_allocated++; 315ab84be7eSDavid Ahern if (net->nexthop.last_id_allocated == id_start) 316ab84be7eSDavid Ahern break; 317ab84be7eSDavid Ahern 318ab84be7eSDavid Ahern if (!nexthop_find_by_id(net, net->nexthop.last_id_allocated)) 319ab84be7eSDavid Ahern return net->nexthop.last_id_allocated; 320ab84be7eSDavid Ahern } 321ab84be7eSDavid Ahern return 0; 322ab84be7eSDavid Ahern } 323ab84be7eSDavid Ahern 324430a0491SDavid Ahern static int nla_put_nh_group(struct sk_buff *skb, struct nh_group *nhg) 325430a0491SDavid Ahern { 326430a0491SDavid Ahern struct nexthop_grp *p; 327430a0491SDavid Ahern size_t len = nhg->num_nh * sizeof(*p); 328430a0491SDavid Ahern struct nlattr *nla; 329430a0491SDavid Ahern u16 group_type = 0; 330430a0491SDavid Ahern int i; 331430a0491SDavid Ahern 332430a0491SDavid Ahern if (nhg->mpath) 333430a0491SDavid Ahern group_type = NEXTHOP_GRP_TYPE_MPATH; 334430a0491SDavid Ahern 335430a0491SDavid Ahern if (nla_put_u16(skb, NHA_GROUP_TYPE, group_type)) 336430a0491SDavid Ahern goto nla_put_failure; 337430a0491SDavid Ahern 338430a0491SDavid Ahern nla = nla_reserve(skb, NHA_GROUP, len); 339430a0491SDavid Ahern if (!nla) 340430a0491SDavid Ahern goto nla_put_failure; 341430a0491SDavid Ahern 342430a0491SDavid Ahern p = nla_data(nla); 343430a0491SDavid Ahern for (i = 0; i < nhg->num_nh; ++i) { 344430a0491SDavid Ahern p->id = nhg->nh_entries[i].nh->id; 345430a0491SDavid Ahern p->weight = nhg->nh_entries[i].weight - 1; 346430a0491SDavid Ahern p += 1; 347430a0491SDavid Ahern } 348430a0491SDavid Ahern 349430a0491SDavid Ahern return 0; 350430a0491SDavid Ahern 351430a0491SDavid Ahern nla_put_failure: 352430a0491SDavid Ahern return -EMSGSIZE; 353430a0491SDavid Ahern } 354430a0491SDavid Ahern 355ab84be7eSDavid Ahern static int nh_fill_node(struct sk_buff *skb, struct nexthop *nh, 356ab84be7eSDavid Ahern int event, u32 portid, u32 seq, unsigned int nlflags) 357ab84be7eSDavid Ahern { 35853010f99SDavid Ahern struct fib6_nh *fib6_nh; 359597cfe4fSDavid Ahern struct fib_nh *fib_nh; 360ab84be7eSDavid Ahern struct nlmsghdr *nlh; 361ab84be7eSDavid Ahern struct nh_info *nhi; 362ab84be7eSDavid Ahern struct nhmsg *nhm; 363ab84be7eSDavid Ahern 364ab84be7eSDavid Ahern nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nhm), nlflags); 365ab84be7eSDavid Ahern if (!nlh) 366ab84be7eSDavid Ahern return -EMSGSIZE; 367ab84be7eSDavid Ahern 368ab84be7eSDavid Ahern nhm = nlmsg_data(nlh); 369ab84be7eSDavid Ahern nhm->nh_family = AF_UNSPEC; 370ab84be7eSDavid Ahern nhm->nh_flags = nh->nh_flags; 371ab84be7eSDavid Ahern nhm->nh_protocol = nh->protocol; 372ab84be7eSDavid Ahern nhm->nh_scope = 0; 373ab84be7eSDavid Ahern nhm->resvd = 0; 374ab84be7eSDavid Ahern 375ab84be7eSDavid Ahern if (nla_put_u32(skb, NHA_ID, nh->id)) 376ab84be7eSDavid Ahern goto nla_put_failure; 377ab84be7eSDavid Ahern 378430a0491SDavid Ahern if (nh->is_group) { 379430a0491SDavid Ahern struct nh_group *nhg = rtnl_dereference(nh->nh_grp); 380430a0491SDavid Ahern 381ce9ac056SDavid Ahern if (nhg->fdb_nh && nla_put_flag(skb, NHA_FDB)) 382ce9ac056SDavid Ahern goto nla_put_failure; 383430a0491SDavid Ahern if (nla_put_nh_group(skb, nhg)) 384430a0491SDavid Ahern goto nla_put_failure; 385430a0491SDavid Ahern goto out; 386430a0491SDavid Ahern } 387430a0491SDavid Ahern 388ab84be7eSDavid Ahern nhi = rtnl_dereference(nh->nh_info); 389ab84be7eSDavid Ahern nhm->nh_family = nhi->family; 390ab84be7eSDavid Ahern if (nhi->reject_nh) { 391ab84be7eSDavid Ahern if (nla_put_flag(skb, NHA_BLACKHOLE)) 392ab84be7eSDavid Ahern goto nla_put_failure; 393ab84be7eSDavid Ahern goto out; 394ce9ac056SDavid Ahern } else if (nhi->fdb_nh) { 395ce9ac056SDavid Ahern if (nla_put_flag(skb, NHA_FDB)) 396ce9ac056SDavid Ahern goto nla_put_failure; 397ce9ac056SDavid Ahern } else { 398597cfe4fSDavid Ahern const struct net_device *dev; 399597cfe4fSDavid Ahern 400597cfe4fSDavid Ahern dev = nhi->fib_nhc.nhc_dev; 401597cfe4fSDavid Ahern if (dev && nla_put_u32(skb, NHA_OIF, dev->ifindex)) 402597cfe4fSDavid Ahern goto nla_put_failure; 403597cfe4fSDavid Ahern } 404597cfe4fSDavid Ahern 405597cfe4fSDavid Ahern nhm->nh_scope = nhi->fib_nhc.nhc_scope; 406597cfe4fSDavid Ahern switch (nhi->family) { 407597cfe4fSDavid Ahern case AF_INET: 408597cfe4fSDavid Ahern fib_nh = &nhi->fib_nh; 409597cfe4fSDavid Ahern if (fib_nh->fib_nh_gw_family && 41033d80996SIdo Schimmel nla_put_be32(skb, NHA_GATEWAY, fib_nh->fib_nh_gw4)) 411597cfe4fSDavid Ahern goto nla_put_failure; 412597cfe4fSDavid Ahern break; 41353010f99SDavid Ahern 41453010f99SDavid Ahern case AF_INET6: 41553010f99SDavid Ahern fib6_nh = &nhi->fib6_nh; 41653010f99SDavid Ahern if (fib6_nh->fib_nh_gw_family && 41753010f99SDavid Ahern nla_put_in6_addr(skb, NHA_GATEWAY, &fib6_nh->fib_nh_gw6)) 41853010f99SDavid Ahern goto nla_put_failure; 41953010f99SDavid Ahern break; 420ab84be7eSDavid Ahern } 421ab84be7eSDavid Ahern 422b513bd03SDavid Ahern if (nhi->fib_nhc.nhc_lwtstate && 423b513bd03SDavid Ahern lwtunnel_fill_encap(skb, nhi->fib_nhc.nhc_lwtstate, 424b513bd03SDavid Ahern NHA_ENCAP, NHA_ENCAP_TYPE) < 0) 425b513bd03SDavid Ahern goto nla_put_failure; 426b513bd03SDavid Ahern 427ab84be7eSDavid Ahern out: 428ab84be7eSDavid Ahern nlmsg_end(skb, nlh); 429ab84be7eSDavid Ahern return 0; 430ab84be7eSDavid Ahern 431ab84be7eSDavid Ahern nla_put_failure: 432d69100b8SStephen Worley nlmsg_cancel(skb, nlh); 433ab84be7eSDavid Ahern return -EMSGSIZE; 434ab84be7eSDavid Ahern } 435ab84be7eSDavid Ahern 436430a0491SDavid Ahern static size_t nh_nlmsg_size_grp(struct nexthop *nh) 437430a0491SDavid Ahern { 438430a0491SDavid Ahern struct nh_group *nhg = rtnl_dereference(nh->nh_grp); 439430a0491SDavid Ahern size_t sz = sizeof(struct nexthop_grp) * nhg->num_nh; 440430a0491SDavid Ahern 441430a0491SDavid Ahern return nla_total_size(sz) + 442430a0491SDavid Ahern nla_total_size(2); /* NHA_GROUP_TYPE */ 443430a0491SDavid Ahern } 444430a0491SDavid Ahern 445430a0491SDavid Ahern static size_t nh_nlmsg_size_single(struct nexthop *nh) 446ab84be7eSDavid Ahern { 447597cfe4fSDavid Ahern struct nh_info *nhi = rtnl_dereference(nh->nh_info); 448430a0491SDavid Ahern size_t sz; 449ab84be7eSDavid Ahern 450ab84be7eSDavid Ahern /* covers NHA_BLACKHOLE since NHA_OIF and BLACKHOLE 451ab84be7eSDavid Ahern * are mutually exclusive 452ab84be7eSDavid Ahern */ 453430a0491SDavid Ahern sz = nla_total_size(4); /* NHA_OIF */ 454ab84be7eSDavid Ahern 455597cfe4fSDavid Ahern switch (nhi->family) { 456597cfe4fSDavid Ahern case AF_INET: 457597cfe4fSDavid Ahern if (nhi->fib_nh.fib_nh_gw_family) 458597cfe4fSDavid Ahern sz += nla_total_size(4); /* NHA_GATEWAY */ 459597cfe4fSDavid Ahern break; 46053010f99SDavid Ahern 46153010f99SDavid Ahern case AF_INET6: 46253010f99SDavid Ahern /* NHA_GATEWAY */ 46353010f99SDavid Ahern if (nhi->fib6_nh.fib_nh_gw_family) 46453010f99SDavid Ahern sz += nla_total_size(sizeof(const struct in6_addr)); 46553010f99SDavid Ahern break; 466597cfe4fSDavid Ahern } 467597cfe4fSDavid Ahern 468b513bd03SDavid Ahern if (nhi->fib_nhc.nhc_lwtstate) { 469b513bd03SDavid Ahern sz += lwtunnel_get_encap_size(nhi->fib_nhc.nhc_lwtstate); 470b513bd03SDavid Ahern sz += nla_total_size(2); /* NHA_ENCAP_TYPE */ 471b513bd03SDavid Ahern } 472b513bd03SDavid Ahern 473ab84be7eSDavid Ahern return sz; 474ab84be7eSDavid Ahern } 475ab84be7eSDavid Ahern 476430a0491SDavid Ahern static size_t nh_nlmsg_size(struct nexthop *nh) 477430a0491SDavid Ahern { 478f9e95555SStephen Worley size_t sz = NLMSG_ALIGN(sizeof(struct nhmsg)); 479f9e95555SStephen Worley 480f9e95555SStephen Worley sz += nla_total_size(4); /* NHA_ID */ 481430a0491SDavid Ahern 482430a0491SDavid Ahern if (nh->is_group) 483430a0491SDavid Ahern sz += nh_nlmsg_size_grp(nh); 484430a0491SDavid Ahern else 485430a0491SDavid Ahern sz += nh_nlmsg_size_single(nh); 486430a0491SDavid Ahern 487430a0491SDavid Ahern return sz; 488430a0491SDavid Ahern } 489430a0491SDavid Ahern 490ab84be7eSDavid Ahern static void nexthop_notify(int event, struct nexthop *nh, struct nl_info *info) 491ab84be7eSDavid Ahern { 492ab84be7eSDavid Ahern unsigned int nlflags = info->nlh ? info->nlh->nlmsg_flags : 0; 493ab84be7eSDavid Ahern u32 seq = info->nlh ? info->nlh->nlmsg_seq : 0; 494ab84be7eSDavid Ahern struct sk_buff *skb; 495ab84be7eSDavid Ahern int err = -ENOBUFS; 496ab84be7eSDavid Ahern 497ab84be7eSDavid Ahern skb = nlmsg_new(nh_nlmsg_size(nh), gfp_any()); 498ab84be7eSDavid Ahern if (!skb) 499ab84be7eSDavid Ahern goto errout; 500ab84be7eSDavid Ahern 501ab84be7eSDavid Ahern err = nh_fill_node(skb, nh, event, info->portid, seq, nlflags); 502ab84be7eSDavid Ahern if (err < 0) { 503ab84be7eSDavid Ahern /* -EMSGSIZE implies BUG in nh_nlmsg_size() */ 504ab84be7eSDavid Ahern WARN_ON(err == -EMSGSIZE); 505ab84be7eSDavid Ahern kfree_skb(skb); 506ab84be7eSDavid Ahern goto errout; 507ab84be7eSDavid Ahern } 508ab84be7eSDavid Ahern 509ab84be7eSDavid Ahern rtnl_notify(skb, info->nl_net, info->portid, RTNLGRP_NEXTHOP, 510ab84be7eSDavid Ahern info->nlh, gfp_any()); 511ab84be7eSDavid Ahern return; 512ab84be7eSDavid Ahern errout: 513ab84be7eSDavid Ahern if (err < 0) 514ab84be7eSDavid Ahern rtnl_set_sk_err(info->nl_net, RTNLGRP_NEXTHOP, err); 515ab84be7eSDavid Ahern } 516ab84be7eSDavid Ahern 517430a0491SDavid Ahern static bool valid_group_nh(struct nexthop *nh, unsigned int npaths, 518ce9ac056SDavid Ahern bool *is_fdb, struct netlink_ext_ack *extack) 519597cfe4fSDavid Ahern { 520430a0491SDavid Ahern if (nh->is_group) { 521430a0491SDavid Ahern struct nh_group *nhg = rtnl_dereference(nh->nh_grp); 522430a0491SDavid Ahern 523430a0491SDavid Ahern /* nested multipath (group within a group) is not 524430a0491SDavid Ahern * supported 525430a0491SDavid Ahern */ 526430a0491SDavid Ahern if (nhg->mpath) { 527430a0491SDavid Ahern NL_SET_ERR_MSG(extack, 528430a0491SDavid Ahern "Multipath group can not be a nexthop within a group"); 529430a0491SDavid Ahern return false; 530430a0491SDavid Ahern } 531ce9ac056SDavid Ahern *is_fdb = nhg->fdb_nh; 532430a0491SDavid Ahern } else { 533430a0491SDavid Ahern struct nh_info *nhi = rtnl_dereference(nh->nh_info); 534430a0491SDavid Ahern 535430a0491SDavid Ahern if (nhi->reject_nh && npaths > 1) { 536430a0491SDavid Ahern NL_SET_ERR_MSG(extack, 537430a0491SDavid Ahern "Blackhole nexthop can not be used in a group with more than 1 path"); 538430a0491SDavid Ahern return false; 539430a0491SDavid Ahern } 540ce9ac056SDavid Ahern *is_fdb = nhi->fdb_nh; 541430a0491SDavid Ahern } 542430a0491SDavid Ahern 543430a0491SDavid Ahern return true; 544430a0491SDavid Ahern } 545430a0491SDavid Ahern 54638428d68SRoopa Prabhu static int nh_check_attr_fdb_group(struct nexthop *nh, u8 *nh_family, 54738428d68SRoopa Prabhu struct netlink_ext_ack *extack) 54838428d68SRoopa Prabhu { 54938428d68SRoopa Prabhu struct nh_info *nhi; 55038428d68SRoopa Prabhu 551ce9ac056SDavid Ahern nhi = rtnl_dereference(nh->nh_info); 552ce9ac056SDavid Ahern 553ce9ac056SDavid Ahern if (!nhi->fdb_nh) { 55438428d68SRoopa Prabhu NL_SET_ERR_MSG(extack, "FDB nexthop group can only have fdb nexthops"); 55538428d68SRoopa Prabhu return -EINVAL; 55638428d68SRoopa Prabhu } 55738428d68SRoopa Prabhu 55838428d68SRoopa Prabhu if (*nh_family == AF_UNSPEC) { 55938428d68SRoopa Prabhu *nh_family = nhi->family; 56038428d68SRoopa Prabhu } else if (*nh_family != nhi->family) { 56138428d68SRoopa Prabhu NL_SET_ERR_MSG(extack, "FDB nexthop group cannot have mixed family nexthops"); 56238428d68SRoopa Prabhu return -EINVAL; 56338428d68SRoopa Prabhu } 56438428d68SRoopa Prabhu 56538428d68SRoopa Prabhu return 0; 56638428d68SRoopa Prabhu } 56738428d68SRoopa Prabhu 568430a0491SDavid Ahern static int nh_check_attr_group(struct net *net, struct nlattr *tb[], 569430a0491SDavid Ahern struct netlink_ext_ack *extack) 570430a0491SDavid Ahern { 571430a0491SDavid Ahern unsigned int len = nla_len(tb[NHA_GROUP]); 57238428d68SRoopa Prabhu u8 nh_family = AF_UNSPEC; 573430a0491SDavid Ahern struct nexthop_grp *nhg; 574430a0491SDavid Ahern unsigned int i, j; 57538428d68SRoopa Prabhu u8 nhg_fdb = 0; 576430a0491SDavid Ahern 577eeaac363SNikolay Aleksandrov if (!len || len & (sizeof(struct nexthop_grp) - 1)) { 578430a0491SDavid Ahern NL_SET_ERR_MSG(extack, 579430a0491SDavid Ahern "Invalid length for nexthop group attribute"); 580430a0491SDavid Ahern return -EINVAL; 581430a0491SDavid Ahern } 582430a0491SDavid Ahern 583430a0491SDavid Ahern /* convert len to number of nexthop ids */ 584430a0491SDavid Ahern len /= sizeof(*nhg); 585430a0491SDavid Ahern 586430a0491SDavid Ahern nhg = nla_data(tb[NHA_GROUP]); 587430a0491SDavid Ahern for (i = 0; i < len; ++i) { 588430a0491SDavid Ahern if (nhg[i].resvd1 || nhg[i].resvd2) { 589430a0491SDavid Ahern NL_SET_ERR_MSG(extack, "Reserved fields in nexthop_grp must be 0"); 590430a0491SDavid Ahern return -EINVAL; 591430a0491SDavid Ahern } 592430a0491SDavid Ahern if (nhg[i].weight > 254) { 593430a0491SDavid Ahern NL_SET_ERR_MSG(extack, "Invalid value for weight"); 594430a0491SDavid Ahern return -EINVAL; 595430a0491SDavid Ahern } 596430a0491SDavid Ahern for (j = i + 1; j < len; ++j) { 597430a0491SDavid Ahern if (nhg[i].id == nhg[j].id) { 598430a0491SDavid Ahern NL_SET_ERR_MSG(extack, "Nexthop id can not be used twice in a group"); 599430a0491SDavid Ahern return -EINVAL; 600430a0491SDavid Ahern } 601430a0491SDavid Ahern } 602430a0491SDavid Ahern } 603430a0491SDavid Ahern 60438428d68SRoopa Prabhu if (tb[NHA_FDB]) 60538428d68SRoopa Prabhu nhg_fdb = 1; 606430a0491SDavid Ahern nhg = nla_data(tb[NHA_GROUP]); 607430a0491SDavid Ahern for (i = 0; i < len; ++i) { 608430a0491SDavid Ahern struct nexthop *nh; 609ce9ac056SDavid Ahern bool is_fdb_nh; 610430a0491SDavid Ahern 611430a0491SDavid Ahern nh = nexthop_find_by_id(net, nhg[i].id); 612430a0491SDavid Ahern if (!nh) { 613430a0491SDavid Ahern NL_SET_ERR_MSG(extack, "Invalid nexthop id"); 614430a0491SDavid Ahern return -EINVAL; 615430a0491SDavid Ahern } 616ce9ac056SDavid Ahern if (!valid_group_nh(nh, len, &is_fdb_nh, extack)) 617430a0491SDavid Ahern return -EINVAL; 61838428d68SRoopa Prabhu 61938428d68SRoopa Prabhu if (nhg_fdb && nh_check_attr_fdb_group(nh, &nh_family, extack)) 62038428d68SRoopa Prabhu return -EINVAL; 62138428d68SRoopa Prabhu 622ce9ac056SDavid Ahern if (!nhg_fdb && is_fdb_nh) { 62338428d68SRoopa Prabhu NL_SET_ERR_MSG(extack, "Non FDB nexthop group cannot have fdb nexthops"); 62438428d68SRoopa Prabhu return -EINVAL; 62538428d68SRoopa Prabhu } 626430a0491SDavid Ahern } 62784be69b8SDavid Ahern for (i = NHA_GROUP_TYPE + 1; i < __NHA_MAX; ++i) { 628430a0491SDavid Ahern if (!tb[i]) 629430a0491SDavid Ahern continue; 63038428d68SRoopa Prabhu if (tb[NHA_FDB]) 63138428d68SRoopa Prabhu continue; 632430a0491SDavid Ahern NL_SET_ERR_MSG(extack, 633430a0491SDavid Ahern "No other attributes can be set in nexthop groups"); 634430a0491SDavid Ahern return -EINVAL; 635430a0491SDavid Ahern } 636430a0491SDavid Ahern 637430a0491SDavid Ahern return 0; 638430a0491SDavid Ahern } 639430a0491SDavid Ahern 640430a0491SDavid Ahern static bool ipv6_good_nh(const struct fib6_nh *nh) 641430a0491SDavid Ahern { 642430a0491SDavid Ahern int state = NUD_REACHABLE; 643430a0491SDavid Ahern struct neighbour *n; 644430a0491SDavid Ahern 645430a0491SDavid Ahern rcu_read_lock_bh(); 646430a0491SDavid Ahern 647430a0491SDavid Ahern n = __ipv6_neigh_lookup_noref_stub(nh->fib_nh_dev, &nh->fib_nh_gw6); 648430a0491SDavid Ahern if (n) 649430a0491SDavid Ahern state = n->nud_state; 650430a0491SDavid Ahern 651430a0491SDavid Ahern rcu_read_unlock_bh(); 652430a0491SDavid Ahern 653430a0491SDavid Ahern return !!(state & NUD_VALID); 654430a0491SDavid Ahern } 655430a0491SDavid Ahern 656430a0491SDavid Ahern static bool ipv4_good_nh(const struct fib_nh *nh) 657430a0491SDavid Ahern { 658430a0491SDavid Ahern int state = NUD_REACHABLE; 659430a0491SDavid Ahern struct neighbour *n; 660430a0491SDavid Ahern 661430a0491SDavid Ahern rcu_read_lock_bh(); 662430a0491SDavid Ahern 663430a0491SDavid Ahern n = __ipv4_neigh_lookup_noref(nh->fib_nh_dev, 664430a0491SDavid Ahern (__force u32)nh->fib_nh_gw4); 665430a0491SDavid Ahern if (n) 666430a0491SDavid Ahern state = n->nud_state; 667430a0491SDavid Ahern 668430a0491SDavid Ahern rcu_read_unlock_bh(); 669430a0491SDavid Ahern 670430a0491SDavid Ahern return !!(state & NUD_VALID); 671430a0491SDavid Ahern } 672430a0491SDavid Ahern 673430a0491SDavid Ahern struct nexthop *nexthop_select_path(struct nexthop *nh, int hash) 674430a0491SDavid Ahern { 675430a0491SDavid Ahern struct nexthop *rc = NULL; 676430a0491SDavid Ahern struct nh_group *nhg; 677430a0491SDavid Ahern int i; 678430a0491SDavid Ahern 679430a0491SDavid Ahern if (!nh->is_group) 680430a0491SDavid Ahern return nh; 681430a0491SDavid Ahern 682430a0491SDavid Ahern nhg = rcu_dereference(nh->nh_grp); 683430a0491SDavid Ahern for (i = 0; i < nhg->num_nh; ++i) { 684430a0491SDavid Ahern struct nh_grp_entry *nhge = &nhg->nh_entries[i]; 685430a0491SDavid Ahern struct nh_info *nhi; 686430a0491SDavid Ahern 687430a0491SDavid Ahern if (hash > atomic_read(&nhge->upper_bound)) 688430a0491SDavid Ahern continue; 689430a0491SDavid Ahern 690ce9ac056SDavid Ahern nhi = rcu_dereference(nhge->nh->nh_info); 691ce9ac056SDavid Ahern if (nhi->fdb_nh) 69238428d68SRoopa Prabhu return nhge->nh; 69338428d68SRoopa Prabhu 694430a0491SDavid Ahern /* nexthops always check if it is good and does 695430a0491SDavid Ahern * not rely on a sysctl for this behavior 696430a0491SDavid Ahern */ 697430a0491SDavid Ahern switch (nhi->family) { 698430a0491SDavid Ahern case AF_INET: 699430a0491SDavid Ahern if (ipv4_good_nh(&nhi->fib_nh)) 700430a0491SDavid Ahern return nhge->nh; 701430a0491SDavid Ahern break; 702430a0491SDavid Ahern case AF_INET6: 703430a0491SDavid Ahern if (ipv6_good_nh(&nhi->fib6_nh)) 704430a0491SDavid Ahern return nhge->nh; 705430a0491SDavid Ahern break; 706430a0491SDavid Ahern } 707430a0491SDavid Ahern 708430a0491SDavid Ahern if (!rc) 709430a0491SDavid Ahern rc = nhge->nh; 710430a0491SDavid Ahern } 711430a0491SDavid Ahern 712430a0491SDavid Ahern return rc; 713430a0491SDavid Ahern } 714430a0491SDavid Ahern EXPORT_SYMBOL_GPL(nexthop_select_path); 715430a0491SDavid Ahern 716f88c9aa1SDavid Ahern int nexthop_for_each_fib6_nh(struct nexthop *nh, 717f88c9aa1SDavid Ahern int (*cb)(struct fib6_nh *nh, void *arg), 718f88c9aa1SDavid Ahern void *arg) 719f88c9aa1SDavid Ahern { 720f88c9aa1SDavid Ahern struct nh_info *nhi; 721f88c9aa1SDavid Ahern int err; 722f88c9aa1SDavid Ahern 723f88c9aa1SDavid Ahern if (nh->is_group) { 724f88c9aa1SDavid Ahern struct nh_group *nhg; 725f88c9aa1SDavid Ahern int i; 726f88c9aa1SDavid Ahern 727f88c9aa1SDavid Ahern nhg = rcu_dereference_rtnl(nh->nh_grp); 728f88c9aa1SDavid Ahern for (i = 0; i < nhg->num_nh; i++) { 729f88c9aa1SDavid Ahern struct nh_grp_entry *nhge = &nhg->nh_entries[i]; 730f88c9aa1SDavid Ahern 731f88c9aa1SDavid Ahern nhi = rcu_dereference_rtnl(nhge->nh->nh_info); 732f88c9aa1SDavid Ahern err = cb(&nhi->fib6_nh, arg); 733f88c9aa1SDavid Ahern if (err) 734f88c9aa1SDavid Ahern return err; 735f88c9aa1SDavid Ahern } 736f88c9aa1SDavid Ahern } else { 737f88c9aa1SDavid Ahern nhi = rcu_dereference_rtnl(nh->nh_info); 738f88c9aa1SDavid Ahern err = cb(&nhi->fib6_nh, arg); 739f88c9aa1SDavid Ahern if (err) 740f88c9aa1SDavid Ahern return err; 741f88c9aa1SDavid Ahern } 742f88c9aa1SDavid Ahern 743f88c9aa1SDavid Ahern return 0; 744f88c9aa1SDavid Ahern } 745f88c9aa1SDavid Ahern EXPORT_SYMBOL_GPL(nexthop_for_each_fib6_nh); 746f88c9aa1SDavid Ahern 7477bf4796dSDavid Ahern static int check_src_addr(const struct in6_addr *saddr, 7487bf4796dSDavid Ahern struct netlink_ext_ack *extack) 7497bf4796dSDavid Ahern { 7507bf4796dSDavid Ahern if (!ipv6_addr_any(saddr)) { 7517bf4796dSDavid Ahern NL_SET_ERR_MSG(extack, "IPv6 routes using source address can not use nexthop objects"); 7527bf4796dSDavid Ahern return -EINVAL; 7537bf4796dSDavid Ahern } 7547bf4796dSDavid Ahern return 0; 7557bf4796dSDavid Ahern } 7567bf4796dSDavid Ahern 757f88d8ea6SDavid Ahern int fib6_check_nexthop(struct nexthop *nh, struct fib6_config *cfg, 758f88d8ea6SDavid Ahern struct netlink_ext_ack *extack) 759f88d8ea6SDavid Ahern { 760f88d8ea6SDavid Ahern struct nh_info *nhi; 761ce9ac056SDavid Ahern bool is_fdb_nh; 76238428d68SRoopa Prabhu 763f88d8ea6SDavid Ahern /* fib6_src is unique to a fib6_info and limits the ability to cache 764f88d8ea6SDavid Ahern * routes in fib6_nh within a nexthop that is potentially shared 765f88d8ea6SDavid Ahern * across multiple fib entries. If the config wants to use source 766f88d8ea6SDavid Ahern * routing it can not use nexthop objects. mlxsw also does not allow 767f88d8ea6SDavid Ahern * fib6_src on routes. 768f88d8ea6SDavid Ahern */ 7697bf4796dSDavid Ahern if (cfg && check_src_addr(&cfg->fc_src, extack) < 0) 770f88d8ea6SDavid Ahern return -EINVAL; 771f88d8ea6SDavid Ahern 772f88d8ea6SDavid Ahern if (nh->is_group) { 773f88d8ea6SDavid Ahern struct nh_group *nhg; 774f88d8ea6SDavid Ahern 775f88d8ea6SDavid Ahern nhg = rtnl_dereference(nh->nh_grp); 776f88d8ea6SDavid Ahern if (nhg->has_v4) 777f88d8ea6SDavid Ahern goto no_v4_nh; 778ce9ac056SDavid Ahern is_fdb_nh = nhg->fdb_nh; 779f88d8ea6SDavid Ahern } else { 780f88d8ea6SDavid Ahern nhi = rtnl_dereference(nh->nh_info); 781f88d8ea6SDavid Ahern if (nhi->family == AF_INET) 782f88d8ea6SDavid Ahern goto no_v4_nh; 783ce9ac056SDavid Ahern is_fdb_nh = nhi->fdb_nh; 784ce9ac056SDavid Ahern } 785ce9ac056SDavid Ahern 786ce9ac056SDavid Ahern if (is_fdb_nh) { 787ce9ac056SDavid Ahern NL_SET_ERR_MSG(extack, "Route cannot point to a fdb nexthop"); 788ce9ac056SDavid Ahern return -EINVAL; 789f88d8ea6SDavid Ahern } 790f88d8ea6SDavid Ahern 791f88d8ea6SDavid Ahern return 0; 792f88d8ea6SDavid Ahern no_v4_nh: 793f88d8ea6SDavid Ahern NL_SET_ERR_MSG(extack, "IPv6 routes can not use an IPv4 nexthop"); 794f88d8ea6SDavid Ahern return -EINVAL; 795f88d8ea6SDavid Ahern } 796f88d8ea6SDavid Ahern EXPORT_SYMBOL_GPL(fib6_check_nexthop); 797f88d8ea6SDavid Ahern 7987bf4796dSDavid Ahern /* if existing nexthop has ipv6 routes linked to it, need 7997bf4796dSDavid Ahern * to verify this new spec works with ipv6 8007bf4796dSDavid Ahern */ 8017bf4796dSDavid Ahern static int fib6_check_nh_list(struct nexthop *old, struct nexthop *new, 8027bf4796dSDavid Ahern struct netlink_ext_ack *extack) 8037bf4796dSDavid Ahern { 8047bf4796dSDavid Ahern struct fib6_info *f6i; 8057bf4796dSDavid Ahern 8067bf4796dSDavid Ahern if (list_empty(&old->f6i_list)) 8077bf4796dSDavid Ahern return 0; 8087bf4796dSDavid Ahern 8097bf4796dSDavid Ahern list_for_each_entry(f6i, &old->f6i_list, nh_list) { 8107bf4796dSDavid Ahern if (check_src_addr(&f6i->fib6_src.addr, extack) < 0) 8117bf4796dSDavid Ahern return -EINVAL; 8127bf4796dSDavid Ahern } 8137bf4796dSDavid Ahern 8147bf4796dSDavid Ahern return fib6_check_nexthop(new, NULL, extack); 8157bf4796dSDavid Ahern } 8167bf4796dSDavid Ahern 817ce9ac056SDavid Ahern static int nexthop_check_scope(struct nh_info *nhi, u8 scope, 8184c7e8084SDavid Ahern struct netlink_ext_ack *extack) 8194c7e8084SDavid Ahern { 8204c7e8084SDavid Ahern if (scope == RT_SCOPE_HOST && nhi->fib_nhc.nhc_gw_family) { 8214c7e8084SDavid Ahern NL_SET_ERR_MSG(extack, 8224c7e8084SDavid Ahern "Route with host scope can not have a gateway"); 8234c7e8084SDavid Ahern return -EINVAL; 8244c7e8084SDavid Ahern } 8254c7e8084SDavid Ahern 8264c7e8084SDavid Ahern if (nhi->fib_nhc.nhc_flags & RTNH_F_ONLINK && scope >= RT_SCOPE_LINK) { 8274c7e8084SDavid Ahern NL_SET_ERR_MSG(extack, "Scope mismatch with nexthop"); 8284c7e8084SDavid Ahern return -EINVAL; 8294c7e8084SDavid Ahern } 8304c7e8084SDavid Ahern 8314c7e8084SDavid Ahern return 0; 8324c7e8084SDavid Ahern } 8334c7e8084SDavid Ahern 8344c7e8084SDavid Ahern /* Invoked by fib add code to verify nexthop by id is ok with 8354c7e8084SDavid Ahern * config for prefix; parts of fib_check_nh not done when nexthop 8364c7e8084SDavid Ahern * object is used. 8374c7e8084SDavid Ahern */ 8384c7e8084SDavid Ahern int fib_check_nexthop(struct nexthop *nh, u8 scope, 8394c7e8084SDavid Ahern struct netlink_ext_ack *extack) 8404c7e8084SDavid Ahern { 841ce9ac056SDavid Ahern struct nh_info *nhi; 8424c7e8084SDavid Ahern int err = 0; 8434c7e8084SDavid Ahern 844ce9ac056SDavid Ahern if (nh->is_group) { 845ce9ac056SDavid Ahern struct nh_group *nhg; 846ce9ac056SDavid Ahern 847ce9ac056SDavid Ahern nhg = rtnl_dereference(nh->nh_grp); 848ce9ac056SDavid Ahern if (nhg->fdb_nh) { 84938428d68SRoopa Prabhu NL_SET_ERR_MSG(extack, "Route cannot point to a fdb nexthop"); 85038428d68SRoopa Prabhu err = -EINVAL; 85138428d68SRoopa Prabhu goto out; 85238428d68SRoopa Prabhu } 85338428d68SRoopa Prabhu 8544c7e8084SDavid Ahern if (scope == RT_SCOPE_HOST) { 8554c7e8084SDavid Ahern NL_SET_ERR_MSG(extack, "Route with host scope can not have multiple nexthops"); 8564c7e8084SDavid Ahern err = -EINVAL; 8574c7e8084SDavid Ahern goto out; 8584c7e8084SDavid Ahern } 8594c7e8084SDavid Ahern 8604c7e8084SDavid Ahern /* all nexthops in a group have the same scope */ 861ce9ac056SDavid Ahern nhi = rtnl_dereference(nhg->nh_entries[0].nh->nh_info); 862ce9ac056SDavid Ahern err = nexthop_check_scope(nhi, scope, extack); 8634c7e8084SDavid Ahern } else { 864ce9ac056SDavid Ahern nhi = rtnl_dereference(nh->nh_info); 865ce9ac056SDavid Ahern if (nhi->fdb_nh) { 866ce9ac056SDavid Ahern NL_SET_ERR_MSG(extack, "Route cannot point to a fdb nexthop"); 867ce9ac056SDavid Ahern err = -EINVAL; 868ce9ac056SDavid Ahern goto out; 8694c7e8084SDavid Ahern } 870ce9ac056SDavid Ahern err = nexthop_check_scope(nhi, scope, extack); 871ce9ac056SDavid Ahern } 872ce9ac056SDavid Ahern 8734c7e8084SDavid Ahern out: 8744c7e8084SDavid Ahern return err; 8754c7e8084SDavid Ahern } 8764c7e8084SDavid Ahern 8777bf4796dSDavid Ahern static int fib_check_nh_list(struct nexthop *old, struct nexthop *new, 8787bf4796dSDavid Ahern struct netlink_ext_ack *extack) 8797bf4796dSDavid Ahern { 8807bf4796dSDavid Ahern struct fib_info *fi; 8817bf4796dSDavid Ahern 8827bf4796dSDavid Ahern list_for_each_entry(fi, &old->fi_list, nh_list) { 8837bf4796dSDavid Ahern int err; 8847bf4796dSDavid Ahern 8857bf4796dSDavid Ahern err = fib_check_nexthop(new, fi->fib_scope, extack); 8867bf4796dSDavid Ahern if (err) 8877bf4796dSDavid Ahern return err; 8887bf4796dSDavid Ahern } 8897bf4796dSDavid Ahern return 0; 8907bf4796dSDavid Ahern } 8917bf4796dSDavid Ahern 892430a0491SDavid Ahern static void nh_group_rebalance(struct nh_group *nhg) 893430a0491SDavid Ahern { 894430a0491SDavid Ahern int total = 0; 895430a0491SDavid Ahern int w = 0; 896430a0491SDavid Ahern int i; 897430a0491SDavid Ahern 898430a0491SDavid Ahern for (i = 0; i < nhg->num_nh; ++i) 899430a0491SDavid Ahern total += nhg->nh_entries[i].weight; 900430a0491SDavid Ahern 901430a0491SDavid Ahern for (i = 0; i < nhg->num_nh; ++i) { 902430a0491SDavid Ahern struct nh_grp_entry *nhge = &nhg->nh_entries[i]; 903430a0491SDavid Ahern int upper_bound; 904430a0491SDavid Ahern 905430a0491SDavid Ahern w += nhge->weight; 906430a0491SDavid Ahern upper_bound = DIV_ROUND_CLOSEST_ULL((u64)w << 31, total) - 1; 907430a0491SDavid Ahern atomic_set(&nhge->upper_bound, upper_bound); 908430a0491SDavid Ahern } 909430a0491SDavid Ahern } 910430a0491SDavid Ahern 911ac21753aSDavid Ahern static void remove_nh_grp_entry(struct net *net, struct nh_grp_entry *nhge, 912430a0491SDavid Ahern struct nl_info *nlinfo) 913430a0491SDavid Ahern { 91490f33bffSNikolay Aleksandrov struct nh_grp_entry *nhges, *new_nhges; 915ac21753aSDavid Ahern struct nexthop *nhp = nhge->nh_parent; 916833a1065SIdo Schimmel struct netlink_ext_ack extack; 917430a0491SDavid Ahern struct nexthop *nh = nhge->nh; 91890f33bffSNikolay Aleksandrov struct nh_group *nhg, *newg; 919833a1065SIdo Schimmel int i, j, err; 920430a0491SDavid Ahern 921430a0491SDavid Ahern WARN_ON(!nh); 922430a0491SDavid Ahern 923ac21753aSDavid Ahern nhg = rtnl_dereference(nhp->nh_grp); 92490f33bffSNikolay Aleksandrov newg = nhg->spare; 925430a0491SDavid Ahern 92690f33bffSNikolay Aleksandrov /* last entry, keep it visible and remove the parent */ 92790f33bffSNikolay Aleksandrov if (nhg->num_nh == 1) { 92890f33bffSNikolay Aleksandrov remove_nexthop(net, nhp, nlinfo); 929430a0491SDavid Ahern return; 93090f33bffSNikolay Aleksandrov } 931430a0491SDavid Ahern 932863b2558SIdo Schimmel newg->has_v4 = false; 93390f33bffSNikolay Aleksandrov newg->mpath = nhg->mpath; 934ce9ac056SDavid Ahern newg->fdb_nh = nhg->fdb_nh; 93590f33bffSNikolay Aleksandrov newg->num_nh = nhg->num_nh; 936430a0491SDavid Ahern 93790f33bffSNikolay Aleksandrov /* copy old entries to new except the one getting removed */ 93890f33bffSNikolay Aleksandrov nhges = nhg->nh_entries; 93990f33bffSNikolay Aleksandrov new_nhges = newg->nh_entries; 94090f33bffSNikolay Aleksandrov for (i = 0, j = 0; i < nhg->num_nh; ++i) { 941863b2558SIdo Schimmel struct nh_info *nhi; 942863b2558SIdo Schimmel 94390f33bffSNikolay Aleksandrov /* current nexthop getting removed */ 94490f33bffSNikolay Aleksandrov if (nhg->nh_entries[i].nh == nh) { 94590f33bffSNikolay Aleksandrov newg->num_nh--; 94690f33bffSNikolay Aleksandrov continue; 94790f33bffSNikolay Aleksandrov } 948430a0491SDavid Ahern 949863b2558SIdo Schimmel nhi = rtnl_dereference(nhges[i].nh->nh_info); 950863b2558SIdo Schimmel if (nhi->family == AF_INET) 951863b2558SIdo Schimmel newg->has_v4 = true; 952863b2558SIdo Schimmel 95390f33bffSNikolay Aleksandrov list_del(&nhges[i].nh_list); 95490f33bffSNikolay Aleksandrov new_nhges[j].nh_parent = nhges[i].nh_parent; 95590f33bffSNikolay Aleksandrov new_nhges[j].nh = nhges[i].nh; 95690f33bffSNikolay Aleksandrov new_nhges[j].weight = nhges[i].weight; 95790f33bffSNikolay Aleksandrov list_add(&new_nhges[j].nh_list, &new_nhges[j].nh->grp_list); 95890f33bffSNikolay Aleksandrov j++; 95990f33bffSNikolay Aleksandrov } 96090f33bffSNikolay Aleksandrov 96190f33bffSNikolay Aleksandrov nh_group_rebalance(newg); 96290f33bffSNikolay Aleksandrov rcu_assign_pointer(nhp->nh_grp, newg); 96390f33bffSNikolay Aleksandrov 96490f33bffSNikolay Aleksandrov list_del(&nhge->nh_list); 96590f33bffSNikolay Aleksandrov nexthop_put(nhge->nh); 966430a0491SDavid Ahern 967833a1065SIdo Schimmel err = call_nexthop_notifiers(net, NEXTHOP_EVENT_REPLACE, nhp, &extack); 968833a1065SIdo Schimmel if (err) 969833a1065SIdo Schimmel pr_err("%s\n", extack._msg); 970833a1065SIdo Schimmel 971430a0491SDavid Ahern if (nlinfo) 972ac21753aSDavid Ahern nexthop_notify(RTM_NEWNEXTHOP, nhp, nlinfo); 973430a0491SDavid Ahern } 974430a0491SDavid Ahern 975430a0491SDavid Ahern static void remove_nexthop_from_groups(struct net *net, struct nexthop *nh, 976430a0491SDavid Ahern struct nl_info *nlinfo) 977430a0491SDavid Ahern { 978430a0491SDavid Ahern struct nh_grp_entry *nhge, *tmp; 979430a0491SDavid Ahern 980ac21753aSDavid Ahern list_for_each_entry_safe(nhge, tmp, &nh->grp_list, nh_list) 981ac21753aSDavid Ahern remove_nh_grp_entry(net, nhge, nlinfo); 982430a0491SDavid Ahern 98390f33bffSNikolay Aleksandrov /* make sure all see the newly published array before releasing rtnl */ 984df6afe2fSIdo Schimmel synchronize_net(); 985430a0491SDavid Ahern } 986430a0491SDavid Ahern 987430a0491SDavid Ahern static void remove_nexthop_group(struct nexthop *nh, struct nl_info *nlinfo) 988430a0491SDavid Ahern { 989430a0491SDavid Ahern struct nh_group *nhg = rcu_dereference_rtnl(nh->nh_grp); 990430a0491SDavid Ahern int i, num_nh = nhg->num_nh; 991430a0491SDavid Ahern 992430a0491SDavid Ahern for (i = 0; i < num_nh; ++i) { 993430a0491SDavid Ahern struct nh_grp_entry *nhge = &nhg->nh_entries[i]; 994430a0491SDavid Ahern 995430a0491SDavid Ahern if (WARN_ON(!nhge->nh)) 996430a0491SDavid Ahern continue; 997430a0491SDavid Ahern 99890f33bffSNikolay Aleksandrov list_del_init(&nhge->nh_list); 999430a0491SDavid Ahern } 1000430a0491SDavid Ahern } 1001430a0491SDavid Ahern 10027bf4796dSDavid Ahern /* not called for nexthop replace */ 10034c7e8084SDavid Ahern static void __remove_nexthop_fib(struct net *net, struct nexthop *nh) 10044c7e8084SDavid Ahern { 1005f88d8ea6SDavid Ahern struct fib6_info *f6i, *tmp; 10064c7e8084SDavid Ahern bool do_flush = false; 10074c7e8084SDavid Ahern struct fib_info *fi; 10084c7e8084SDavid Ahern 10094c7e8084SDavid Ahern list_for_each_entry(fi, &nh->fi_list, nh_list) { 10104c7e8084SDavid Ahern fi->fib_flags |= RTNH_F_DEAD; 10114c7e8084SDavid Ahern do_flush = true; 10124c7e8084SDavid Ahern } 10134c7e8084SDavid Ahern if (do_flush) 10144c7e8084SDavid Ahern fib_flush(net); 1015f88d8ea6SDavid Ahern 1016f88d8ea6SDavid Ahern /* ip6_del_rt removes the entry from this list hence the _safe */ 1017f88d8ea6SDavid Ahern list_for_each_entry_safe(f6i, tmp, &nh->f6i_list, nh_list) { 1018f88d8ea6SDavid Ahern /* __ip6_del_rt does a release, so do a hold here */ 1019f88d8ea6SDavid Ahern fib6_info_hold(f6i); 10204f80116dSRoopa Prabhu ipv6_stub->ip6_del_rt(net, f6i, 10214f80116dSRoopa Prabhu !net->ipv4.sysctl_nexthop_compat_mode); 1022f88d8ea6SDavid Ahern } 10234c7e8084SDavid Ahern } 10244c7e8084SDavid Ahern 1025430a0491SDavid Ahern static void __remove_nexthop(struct net *net, struct nexthop *nh, 1026430a0491SDavid Ahern struct nl_info *nlinfo) 1027430a0491SDavid Ahern { 10284c7e8084SDavid Ahern __remove_nexthop_fib(net, nh); 10294c7e8084SDavid Ahern 1030430a0491SDavid Ahern if (nh->is_group) { 1031430a0491SDavid Ahern remove_nexthop_group(nh, nlinfo); 1032430a0491SDavid Ahern } else { 1033597cfe4fSDavid Ahern struct nh_info *nhi; 1034597cfe4fSDavid Ahern 1035597cfe4fSDavid Ahern nhi = rtnl_dereference(nh->nh_info); 1036597cfe4fSDavid Ahern if (nhi->fib_nhc.nhc_dev) 1037597cfe4fSDavid Ahern hlist_del(&nhi->dev_hash); 1038430a0491SDavid Ahern 1039430a0491SDavid Ahern remove_nexthop_from_groups(net, nh, nlinfo); 1040430a0491SDavid Ahern } 1041597cfe4fSDavid Ahern } 1042597cfe4fSDavid Ahern 1043ab84be7eSDavid Ahern static void remove_nexthop(struct net *net, struct nexthop *nh, 1044430a0491SDavid Ahern struct nl_info *nlinfo) 1045ab84be7eSDavid Ahern { 10463578d53dSIdo Schimmel call_nexthop_notifiers(net, NEXTHOP_EVENT_DEL, nh, NULL); 10470695564bSIdo Schimmel 1048ab84be7eSDavid Ahern /* remove from the tree */ 1049ab84be7eSDavid Ahern rb_erase(&nh->rb_node, &net->nexthop.rb_root); 1050ab84be7eSDavid Ahern 1051ab84be7eSDavid Ahern if (nlinfo) 1052ab84be7eSDavid Ahern nexthop_notify(RTM_DELNEXTHOP, nh, nlinfo); 1053ab84be7eSDavid Ahern 1054430a0491SDavid Ahern __remove_nexthop(net, nh, nlinfo); 1055ab84be7eSDavid Ahern nh_base_seq_inc(net); 1056ab84be7eSDavid Ahern 1057ab84be7eSDavid Ahern nexthop_put(nh); 1058ab84be7eSDavid Ahern } 1059ab84be7eSDavid Ahern 10607bf4796dSDavid Ahern /* if any FIB entries reference this nexthop, any dst entries 10617bf4796dSDavid Ahern * need to be regenerated 10627bf4796dSDavid Ahern */ 10637bf4796dSDavid Ahern static void nh_rt_cache_flush(struct net *net, struct nexthop *nh) 10647bf4796dSDavid Ahern { 10657bf4796dSDavid Ahern struct fib6_info *f6i; 10667bf4796dSDavid Ahern 10677bf4796dSDavid Ahern if (!list_empty(&nh->fi_list)) 10687bf4796dSDavid Ahern rt_cache_flush(net); 10697bf4796dSDavid Ahern 10707bf4796dSDavid Ahern list_for_each_entry(f6i, &nh->f6i_list, nh_list) 10717bf4796dSDavid Ahern ipv6_stub->fib6_update_sernum(net, f6i); 10727bf4796dSDavid Ahern } 10737bf4796dSDavid Ahern 10747bf4796dSDavid Ahern static int replace_nexthop_grp(struct net *net, struct nexthop *old, 10757bf4796dSDavid Ahern struct nexthop *new, 10767bf4796dSDavid Ahern struct netlink_ext_ack *extack) 10777bf4796dSDavid Ahern { 10787bf4796dSDavid Ahern struct nh_group *oldg, *newg; 1079d144cc5fSIdo Schimmel int i, err; 10807bf4796dSDavid Ahern 10817bf4796dSDavid Ahern if (!new->is_group) { 10827bf4796dSDavid Ahern NL_SET_ERR_MSG(extack, "Can not replace a nexthop group with a nexthop."); 10837bf4796dSDavid Ahern return -EINVAL; 10847bf4796dSDavid Ahern } 10857bf4796dSDavid Ahern 1086d144cc5fSIdo Schimmel err = call_nexthop_notifiers(net, NEXTHOP_EVENT_REPLACE, new, extack); 1087d144cc5fSIdo Schimmel if (err) 1088d144cc5fSIdo Schimmel return err; 1089d144cc5fSIdo Schimmel 10907bf4796dSDavid Ahern oldg = rtnl_dereference(old->nh_grp); 10917bf4796dSDavid Ahern newg = rtnl_dereference(new->nh_grp); 10927bf4796dSDavid Ahern 10937bf4796dSDavid Ahern /* update parents - used by nexthop code for cleanup */ 10947bf4796dSDavid Ahern for (i = 0; i < newg->num_nh; i++) 10957bf4796dSDavid Ahern newg->nh_entries[i].nh_parent = old; 10967bf4796dSDavid Ahern 10977bf4796dSDavid Ahern rcu_assign_pointer(old->nh_grp, newg); 10987bf4796dSDavid Ahern 10997bf4796dSDavid Ahern for (i = 0; i < oldg->num_nh; i++) 11007bf4796dSDavid Ahern oldg->nh_entries[i].nh_parent = new; 11017bf4796dSDavid Ahern 11027bf4796dSDavid Ahern rcu_assign_pointer(new->nh_grp, oldg); 11037bf4796dSDavid Ahern 11047bf4796dSDavid Ahern return 0; 11057bf4796dSDavid Ahern } 11067bf4796dSDavid Ahern 1107885a3b15SIdo Schimmel static void nh_group_v4_update(struct nh_group *nhg) 1108885a3b15SIdo Schimmel { 1109885a3b15SIdo Schimmel struct nh_grp_entry *nhges; 1110885a3b15SIdo Schimmel bool has_v4 = false; 1111885a3b15SIdo Schimmel int i; 1112885a3b15SIdo Schimmel 1113885a3b15SIdo Schimmel nhges = nhg->nh_entries; 1114885a3b15SIdo Schimmel for (i = 0; i < nhg->num_nh; i++) { 1115885a3b15SIdo Schimmel struct nh_info *nhi; 1116885a3b15SIdo Schimmel 1117885a3b15SIdo Schimmel nhi = rtnl_dereference(nhges[i].nh->nh_info); 1118885a3b15SIdo Schimmel if (nhi->family == AF_INET) 1119885a3b15SIdo Schimmel has_v4 = true; 1120885a3b15SIdo Schimmel } 1121885a3b15SIdo Schimmel nhg->has_v4 = has_v4; 1122885a3b15SIdo Schimmel } 1123885a3b15SIdo Schimmel 11247bf4796dSDavid Ahern static int replace_nexthop_single(struct net *net, struct nexthop *old, 11257bf4796dSDavid Ahern struct nexthop *new, 11267bf4796dSDavid Ahern struct netlink_ext_ack *extack) 11277bf4796dSDavid Ahern { 1128f17bc33dSIdo Schimmel u8 old_protocol, old_nh_flags; 11297bf4796dSDavid Ahern struct nh_info *oldi, *newi; 1130f17bc33dSIdo Schimmel struct nh_grp_entry *nhge; 11318c09c9f9SIdo Schimmel int err; 11327bf4796dSDavid Ahern 11337bf4796dSDavid Ahern if (new->is_group) { 11347bf4796dSDavid Ahern NL_SET_ERR_MSG(extack, "Can not replace a nexthop with a nexthop group."); 11357bf4796dSDavid Ahern return -EINVAL; 11367bf4796dSDavid Ahern } 11377bf4796dSDavid Ahern 11388c09c9f9SIdo Schimmel err = call_nexthop_notifiers(net, NEXTHOP_EVENT_REPLACE, new, extack); 11398c09c9f9SIdo Schimmel if (err) 11408c09c9f9SIdo Schimmel return err; 11418c09c9f9SIdo Schimmel 11428c09c9f9SIdo Schimmel /* Hardware flags were set on 'old' as 'new' is not in the red-black 11438c09c9f9SIdo Schimmel * tree. Therefore, inherit the flags from 'old' to 'new'. 11448c09c9f9SIdo Schimmel */ 11458c09c9f9SIdo Schimmel new->nh_flags |= old->nh_flags & (RTNH_F_OFFLOAD | RTNH_F_TRAP); 11468c09c9f9SIdo Schimmel 11477bf4796dSDavid Ahern oldi = rtnl_dereference(old->nh_info); 11487bf4796dSDavid Ahern newi = rtnl_dereference(new->nh_info); 11497bf4796dSDavid Ahern 11507bf4796dSDavid Ahern newi->nh_parent = old; 11517bf4796dSDavid Ahern oldi->nh_parent = new; 11527bf4796dSDavid Ahern 1153f17bc33dSIdo Schimmel old_protocol = old->protocol; 1154f17bc33dSIdo Schimmel old_nh_flags = old->nh_flags; 1155f17bc33dSIdo Schimmel 11567bf4796dSDavid Ahern old->protocol = new->protocol; 11577bf4796dSDavid Ahern old->nh_flags = new->nh_flags; 11587bf4796dSDavid Ahern 11597bf4796dSDavid Ahern rcu_assign_pointer(old->nh_info, newi); 11607bf4796dSDavid Ahern rcu_assign_pointer(new->nh_info, oldi); 11617bf4796dSDavid Ahern 1162f17bc33dSIdo Schimmel /* Send a replace notification for all the groups using the nexthop. */ 1163f17bc33dSIdo Schimmel list_for_each_entry(nhge, &old->grp_list, nh_list) { 1164f17bc33dSIdo Schimmel struct nexthop *nhp = nhge->nh_parent; 1165f17bc33dSIdo Schimmel 1166f17bc33dSIdo Schimmel err = call_nexthop_notifiers(net, NEXTHOP_EVENT_REPLACE, nhp, 1167f17bc33dSIdo Schimmel extack); 1168f17bc33dSIdo Schimmel if (err) 1169f17bc33dSIdo Schimmel goto err_notify; 1170f17bc33dSIdo Schimmel } 1171f17bc33dSIdo Schimmel 1172885a3b15SIdo Schimmel /* When replacing an IPv4 nexthop with an IPv6 nexthop, potentially 1173885a3b15SIdo Schimmel * update IPv4 indication in all the groups using the nexthop. 1174885a3b15SIdo Schimmel */ 1175885a3b15SIdo Schimmel if (oldi->family == AF_INET && newi->family == AF_INET6) { 1176885a3b15SIdo Schimmel list_for_each_entry(nhge, &old->grp_list, nh_list) { 1177885a3b15SIdo Schimmel struct nexthop *nhp = nhge->nh_parent; 1178885a3b15SIdo Schimmel struct nh_group *nhg; 1179885a3b15SIdo Schimmel 1180885a3b15SIdo Schimmel nhg = rtnl_dereference(nhp->nh_grp); 1181885a3b15SIdo Schimmel nh_group_v4_update(nhg); 1182885a3b15SIdo Schimmel } 1183885a3b15SIdo Schimmel } 1184885a3b15SIdo Schimmel 11857bf4796dSDavid Ahern return 0; 1186f17bc33dSIdo Schimmel 1187f17bc33dSIdo Schimmel err_notify: 1188f17bc33dSIdo Schimmel rcu_assign_pointer(new->nh_info, newi); 1189f17bc33dSIdo Schimmel rcu_assign_pointer(old->nh_info, oldi); 1190f17bc33dSIdo Schimmel old->nh_flags = old_nh_flags; 1191f17bc33dSIdo Schimmel old->protocol = old_protocol; 1192f17bc33dSIdo Schimmel oldi->nh_parent = old; 1193f17bc33dSIdo Schimmel newi->nh_parent = new; 1194f17bc33dSIdo Schimmel list_for_each_entry_continue_reverse(nhge, &old->grp_list, nh_list) { 1195f17bc33dSIdo Schimmel struct nexthop *nhp = nhge->nh_parent; 1196f17bc33dSIdo Schimmel 1197f17bc33dSIdo Schimmel call_nexthop_notifiers(net, NEXTHOP_EVENT_REPLACE, nhp, extack); 1198f17bc33dSIdo Schimmel } 1199f17bc33dSIdo Schimmel call_nexthop_notifiers(net, NEXTHOP_EVENT_REPLACE, old, extack); 1200f17bc33dSIdo Schimmel return err; 12017bf4796dSDavid Ahern } 12027bf4796dSDavid Ahern 12037bf4796dSDavid Ahern static void __nexthop_replace_notify(struct net *net, struct nexthop *nh, 12047bf4796dSDavid Ahern struct nl_info *info) 12057bf4796dSDavid Ahern { 12067bf4796dSDavid Ahern struct fib6_info *f6i; 12077bf4796dSDavid Ahern 12087bf4796dSDavid Ahern if (!list_empty(&nh->fi_list)) { 12097bf4796dSDavid Ahern struct fib_info *fi; 12107bf4796dSDavid Ahern 12117bf4796dSDavid Ahern /* expectation is a few fib_info per nexthop and then 12127bf4796dSDavid Ahern * a lot of routes per fib_info. So mark the fib_info 12137bf4796dSDavid Ahern * and then walk the fib tables once 12147bf4796dSDavid Ahern */ 12157bf4796dSDavid Ahern list_for_each_entry(fi, &nh->fi_list, nh_list) 12167bf4796dSDavid Ahern fi->nh_updated = true; 12177bf4796dSDavid Ahern 12187bf4796dSDavid Ahern fib_info_notify_update(net, info); 12197bf4796dSDavid Ahern 12207bf4796dSDavid Ahern list_for_each_entry(fi, &nh->fi_list, nh_list) 12217bf4796dSDavid Ahern fi->nh_updated = false; 12227bf4796dSDavid Ahern } 12237bf4796dSDavid Ahern 12247bf4796dSDavid Ahern list_for_each_entry(f6i, &nh->f6i_list, nh_list) 12257bf4796dSDavid Ahern ipv6_stub->fib6_rt_update(net, f6i, info); 12267bf4796dSDavid Ahern } 12277bf4796dSDavid Ahern 12287bf4796dSDavid Ahern /* send RTM_NEWROUTE with REPLACE flag set for all FIB entries 12297bf4796dSDavid Ahern * linked to this nexthop and for all groups that the nexthop 12307bf4796dSDavid Ahern * is a member of 12317bf4796dSDavid Ahern */ 12327bf4796dSDavid Ahern static void nexthop_replace_notify(struct net *net, struct nexthop *nh, 12337bf4796dSDavid Ahern struct nl_info *info) 12347bf4796dSDavid Ahern { 12357bf4796dSDavid Ahern struct nh_grp_entry *nhge; 12367bf4796dSDavid Ahern 12377bf4796dSDavid Ahern __nexthop_replace_notify(net, nh, info); 12387bf4796dSDavid Ahern 12397bf4796dSDavid Ahern list_for_each_entry(nhge, &nh->grp_list, nh_list) 12407bf4796dSDavid Ahern __nexthop_replace_notify(net, nhge->nh_parent, info); 12417bf4796dSDavid Ahern } 12427bf4796dSDavid Ahern 1243ab84be7eSDavid Ahern static int replace_nexthop(struct net *net, struct nexthop *old, 1244ab84be7eSDavid Ahern struct nexthop *new, struct netlink_ext_ack *extack) 1245ab84be7eSDavid Ahern { 12467bf4796dSDavid Ahern bool new_is_reject = false; 12477bf4796dSDavid Ahern struct nh_grp_entry *nhge; 12487bf4796dSDavid Ahern int err; 12497bf4796dSDavid Ahern 12507bf4796dSDavid Ahern /* check that existing FIB entries are ok with the 12517bf4796dSDavid Ahern * new nexthop definition 12527bf4796dSDavid Ahern */ 12537bf4796dSDavid Ahern err = fib_check_nh_list(old, new, extack); 12547bf4796dSDavid Ahern if (err) 12557bf4796dSDavid Ahern return err; 12567bf4796dSDavid Ahern 12577bf4796dSDavid Ahern err = fib6_check_nh_list(old, new, extack); 12587bf4796dSDavid Ahern if (err) 12597bf4796dSDavid Ahern return err; 12607bf4796dSDavid Ahern 12617bf4796dSDavid Ahern if (!new->is_group) { 12627bf4796dSDavid Ahern struct nh_info *nhi = rtnl_dereference(new->nh_info); 12637bf4796dSDavid Ahern 12647bf4796dSDavid Ahern new_is_reject = nhi->reject_nh; 12657bf4796dSDavid Ahern } 12667bf4796dSDavid Ahern 12677bf4796dSDavid Ahern list_for_each_entry(nhge, &old->grp_list, nh_list) { 12687bf4796dSDavid Ahern /* if new nexthop is a blackhole, any groups using this 12697bf4796dSDavid Ahern * nexthop cannot have more than 1 path 12707bf4796dSDavid Ahern */ 12717bf4796dSDavid Ahern if (new_is_reject && 12727bf4796dSDavid Ahern nexthop_num_path(nhge->nh_parent) > 1) { 12737bf4796dSDavid Ahern NL_SET_ERR_MSG(extack, "Blackhole nexthop can not be a member of a group with more than one path"); 12747bf4796dSDavid Ahern return -EINVAL; 12757bf4796dSDavid Ahern } 12767bf4796dSDavid Ahern 12777bf4796dSDavid Ahern err = fib_check_nh_list(nhge->nh_parent, new, extack); 12787bf4796dSDavid Ahern if (err) 12797bf4796dSDavid Ahern return err; 12807bf4796dSDavid Ahern 12817bf4796dSDavid Ahern err = fib6_check_nh_list(nhge->nh_parent, new, extack); 12827bf4796dSDavid Ahern if (err) 12837bf4796dSDavid Ahern return err; 12847bf4796dSDavid Ahern } 12857bf4796dSDavid Ahern 12867bf4796dSDavid Ahern if (old->is_group) 12877bf4796dSDavid Ahern err = replace_nexthop_grp(net, old, new, extack); 12887bf4796dSDavid Ahern else 12897bf4796dSDavid Ahern err = replace_nexthop_single(net, old, new, extack); 12907bf4796dSDavid Ahern 12917bf4796dSDavid Ahern if (!err) { 12927bf4796dSDavid Ahern nh_rt_cache_flush(net, old); 12937bf4796dSDavid Ahern 12947bf4796dSDavid Ahern __remove_nexthop(net, new, NULL); 12957bf4796dSDavid Ahern nexthop_put(new); 12967bf4796dSDavid Ahern } 12977bf4796dSDavid Ahern 12987bf4796dSDavid Ahern return err; 1299ab84be7eSDavid Ahern } 1300ab84be7eSDavid Ahern 1301ab84be7eSDavid Ahern /* called with rtnl_lock held */ 1302ab84be7eSDavid Ahern static int insert_nexthop(struct net *net, struct nexthop *new_nh, 1303ab84be7eSDavid Ahern struct nh_config *cfg, struct netlink_ext_ack *extack) 1304ab84be7eSDavid Ahern { 1305ab84be7eSDavid Ahern struct rb_node **pp, *parent = NULL, *next; 1306ab84be7eSDavid Ahern struct rb_root *root = &net->nexthop.rb_root; 1307ab84be7eSDavid Ahern bool replace = !!(cfg->nlflags & NLM_F_REPLACE); 1308ab84be7eSDavid Ahern bool create = !!(cfg->nlflags & NLM_F_CREATE); 1309ab84be7eSDavid Ahern u32 new_id = new_nh->id; 13107bf4796dSDavid Ahern int replace_notify = 0; 1311ab84be7eSDavid Ahern int rc = -EEXIST; 1312ab84be7eSDavid Ahern 1313ab84be7eSDavid Ahern pp = &root->rb_node; 1314ab84be7eSDavid Ahern while (1) { 1315ab84be7eSDavid Ahern struct nexthop *nh; 1316ab84be7eSDavid Ahern 1317233c6378SIdo Schimmel next = *pp; 1318ab84be7eSDavid Ahern if (!next) 1319ab84be7eSDavid Ahern break; 1320ab84be7eSDavid Ahern 1321ab84be7eSDavid Ahern parent = next; 1322ab84be7eSDavid Ahern 1323ab84be7eSDavid Ahern nh = rb_entry(parent, struct nexthop, rb_node); 1324ab84be7eSDavid Ahern if (new_id < nh->id) { 1325ab84be7eSDavid Ahern pp = &next->rb_left; 1326ab84be7eSDavid Ahern } else if (new_id > nh->id) { 1327ab84be7eSDavid Ahern pp = &next->rb_right; 1328ab84be7eSDavid Ahern } else if (replace) { 1329ab84be7eSDavid Ahern rc = replace_nexthop(net, nh, new_nh, extack); 13307bf4796dSDavid Ahern if (!rc) { 1331ab84be7eSDavid Ahern new_nh = nh; /* send notification with old nh */ 13327bf4796dSDavid Ahern replace_notify = 1; 13337bf4796dSDavid Ahern } 1334ab84be7eSDavid Ahern goto out; 1335ab84be7eSDavid Ahern } else { 1336ab84be7eSDavid Ahern /* id already exists and not a replace */ 1337ab84be7eSDavid Ahern goto out; 1338ab84be7eSDavid Ahern } 1339ab84be7eSDavid Ahern } 1340ab84be7eSDavid Ahern 1341ab84be7eSDavid Ahern if (replace && !create) { 1342ab84be7eSDavid Ahern NL_SET_ERR_MSG(extack, "Replace specified without create and no entry exists"); 1343ab84be7eSDavid Ahern rc = -ENOENT; 1344ab84be7eSDavid Ahern goto out; 1345ab84be7eSDavid Ahern } 1346ab84be7eSDavid Ahern 1347ab84be7eSDavid Ahern rb_link_node_rcu(&new_nh->rb_node, parent, pp); 1348ab84be7eSDavid Ahern rb_insert_color(&new_nh->rb_node, root); 1349732d167bSIdo Schimmel 1350732d167bSIdo Schimmel rc = call_nexthop_notifiers(net, NEXTHOP_EVENT_REPLACE, new_nh, extack); 1351732d167bSIdo Schimmel if (rc) 1352732d167bSIdo Schimmel rb_erase(&new_nh->rb_node, &net->nexthop.rb_root); 1353732d167bSIdo Schimmel 1354ab84be7eSDavid Ahern out: 1355ab84be7eSDavid Ahern if (!rc) { 1356ab84be7eSDavid Ahern nh_base_seq_inc(net); 1357ab84be7eSDavid Ahern nexthop_notify(RTM_NEWNEXTHOP, new_nh, &cfg->nlinfo); 13584f80116dSRoopa Prabhu if (replace_notify && net->ipv4.sysctl_nexthop_compat_mode) 13597bf4796dSDavid Ahern nexthop_replace_notify(net, new_nh, &cfg->nlinfo); 1360ab84be7eSDavid Ahern } 1361ab84be7eSDavid Ahern 1362ab84be7eSDavid Ahern return rc; 1363ab84be7eSDavid Ahern } 1364ab84be7eSDavid Ahern 1365597cfe4fSDavid Ahern /* rtnl */ 1366597cfe4fSDavid Ahern /* remove all nexthops tied to a device being deleted */ 1367597cfe4fSDavid Ahern static void nexthop_flush_dev(struct net_device *dev) 1368597cfe4fSDavid Ahern { 1369597cfe4fSDavid Ahern unsigned int hash = nh_dev_hashfn(dev->ifindex); 1370597cfe4fSDavid Ahern struct net *net = dev_net(dev); 1371597cfe4fSDavid Ahern struct hlist_head *head = &net->nexthop.devhash[hash]; 1372597cfe4fSDavid Ahern struct hlist_node *n; 1373597cfe4fSDavid Ahern struct nh_info *nhi; 1374597cfe4fSDavid Ahern 1375597cfe4fSDavid Ahern hlist_for_each_entry_safe(nhi, n, head, dev_hash) { 1376597cfe4fSDavid Ahern if (nhi->fib_nhc.nhc_dev != dev) 1377597cfe4fSDavid Ahern continue; 1378597cfe4fSDavid Ahern 1379430a0491SDavid Ahern remove_nexthop(net, nhi->nh_parent, NULL); 1380597cfe4fSDavid Ahern } 1381597cfe4fSDavid Ahern } 1382597cfe4fSDavid Ahern 1383ab84be7eSDavid Ahern /* rtnl; called when net namespace is deleted */ 1384ab84be7eSDavid Ahern static void flush_all_nexthops(struct net *net) 1385ab84be7eSDavid Ahern { 1386ab84be7eSDavid Ahern struct rb_root *root = &net->nexthop.rb_root; 1387ab84be7eSDavid Ahern struct rb_node *node; 1388ab84be7eSDavid Ahern struct nexthop *nh; 1389ab84be7eSDavid Ahern 1390ab84be7eSDavid Ahern while ((node = rb_first(root))) { 1391ab84be7eSDavid Ahern nh = rb_entry(node, struct nexthop, rb_node); 1392430a0491SDavid Ahern remove_nexthop(net, nh, NULL); 1393ab84be7eSDavid Ahern cond_resched(); 1394ab84be7eSDavid Ahern } 1395ab84be7eSDavid Ahern } 1396ab84be7eSDavid Ahern 1397430a0491SDavid Ahern static struct nexthop *nexthop_create_group(struct net *net, 1398430a0491SDavid Ahern struct nh_config *cfg) 1399430a0491SDavid Ahern { 1400430a0491SDavid Ahern struct nlattr *grps_attr = cfg->nh_grp; 1401430a0491SDavid Ahern struct nexthop_grp *entry = nla_data(grps_attr); 140290f33bffSNikolay Aleksandrov u16 num_nh = nla_len(grps_attr) / sizeof(*entry); 1403430a0491SDavid Ahern struct nh_group *nhg; 1404430a0491SDavid Ahern struct nexthop *nh; 1405430a0491SDavid Ahern int i; 1406430a0491SDavid Ahern 1407eeaac363SNikolay Aleksandrov if (WARN_ON(!num_nh)) 1408eeaac363SNikolay Aleksandrov return ERR_PTR(-EINVAL); 1409eeaac363SNikolay Aleksandrov 1410430a0491SDavid Ahern nh = nexthop_alloc(); 1411430a0491SDavid Ahern if (!nh) 1412430a0491SDavid Ahern return ERR_PTR(-ENOMEM); 1413430a0491SDavid Ahern 1414430a0491SDavid Ahern nh->is_group = 1; 1415430a0491SDavid Ahern 141690f33bffSNikolay Aleksandrov nhg = nexthop_grp_alloc(num_nh); 1417430a0491SDavid Ahern if (!nhg) { 1418430a0491SDavid Ahern kfree(nh); 1419430a0491SDavid Ahern return ERR_PTR(-ENOMEM); 1420430a0491SDavid Ahern } 1421430a0491SDavid Ahern 142290f33bffSNikolay Aleksandrov /* spare group used for removals */ 142390f33bffSNikolay Aleksandrov nhg->spare = nexthop_grp_alloc(num_nh); 1424dafe2078SPatrick Eigensatz if (!nhg->spare) { 142590f33bffSNikolay Aleksandrov kfree(nhg); 142690f33bffSNikolay Aleksandrov kfree(nh); 1427dafe2078SPatrick Eigensatz return ERR_PTR(-ENOMEM); 142890f33bffSNikolay Aleksandrov } 142990f33bffSNikolay Aleksandrov nhg->spare->spare = nhg; 143090f33bffSNikolay Aleksandrov 1431430a0491SDavid Ahern for (i = 0; i < nhg->num_nh; ++i) { 1432430a0491SDavid Ahern struct nexthop *nhe; 1433430a0491SDavid Ahern struct nh_info *nhi; 1434430a0491SDavid Ahern 1435430a0491SDavid Ahern nhe = nexthop_find_by_id(net, entry[i].id); 1436430a0491SDavid Ahern if (!nexthop_get(nhe)) 1437430a0491SDavid Ahern goto out_no_nh; 1438430a0491SDavid Ahern 1439430a0491SDavid Ahern nhi = rtnl_dereference(nhe->nh_info); 1440430a0491SDavid Ahern if (nhi->family == AF_INET) 1441430a0491SDavid Ahern nhg->has_v4 = true; 1442430a0491SDavid Ahern 1443430a0491SDavid Ahern nhg->nh_entries[i].nh = nhe; 1444430a0491SDavid Ahern nhg->nh_entries[i].weight = entry[i].weight + 1; 1445430a0491SDavid Ahern list_add(&nhg->nh_entries[i].nh_list, &nhe->grp_list); 1446430a0491SDavid Ahern nhg->nh_entries[i].nh_parent = nh; 1447430a0491SDavid Ahern } 1448430a0491SDavid Ahern 1449430a0491SDavid Ahern if (cfg->nh_grp_type == NEXTHOP_GRP_TYPE_MPATH) { 1450430a0491SDavid Ahern nhg->mpath = 1; 1451430a0491SDavid Ahern nh_group_rebalance(nhg); 1452430a0491SDavid Ahern } 1453430a0491SDavid Ahern 145438428d68SRoopa Prabhu if (cfg->nh_fdb) 1455ce9ac056SDavid Ahern nhg->fdb_nh = 1; 145638428d68SRoopa Prabhu 1457430a0491SDavid Ahern rcu_assign_pointer(nh->nh_grp, nhg); 1458430a0491SDavid Ahern 1459430a0491SDavid Ahern return nh; 1460430a0491SDavid Ahern 1461430a0491SDavid Ahern out_no_nh: 1462*7b01e53eSIdo Schimmel for (i--; i >= 0; --i) { 1463*7b01e53eSIdo Schimmel list_del(&nhg->nh_entries[i].nh_list); 1464430a0491SDavid Ahern nexthop_put(nhg->nh_entries[i].nh); 1465*7b01e53eSIdo Schimmel } 1466430a0491SDavid Ahern 146790f33bffSNikolay Aleksandrov kfree(nhg->spare); 1468430a0491SDavid Ahern kfree(nhg); 1469430a0491SDavid Ahern kfree(nh); 1470430a0491SDavid Ahern 1471430a0491SDavid Ahern return ERR_PTR(-ENOENT); 1472430a0491SDavid Ahern } 1473430a0491SDavid Ahern 1474597cfe4fSDavid Ahern static int nh_create_ipv4(struct net *net, struct nexthop *nh, 1475597cfe4fSDavid Ahern struct nh_info *nhi, struct nh_config *cfg, 1476597cfe4fSDavid Ahern struct netlink_ext_ack *extack) 1477597cfe4fSDavid Ahern { 1478597cfe4fSDavid Ahern struct fib_nh *fib_nh = &nhi->fib_nh; 1479597cfe4fSDavid Ahern struct fib_config fib_cfg = { 1480597cfe4fSDavid Ahern .fc_oif = cfg->nh_ifindex, 1481597cfe4fSDavid Ahern .fc_gw4 = cfg->gw.ipv4, 1482597cfe4fSDavid Ahern .fc_gw_family = cfg->gw.ipv4 ? AF_INET : 0, 1483597cfe4fSDavid Ahern .fc_flags = cfg->nh_flags, 1484b513bd03SDavid Ahern .fc_encap = cfg->nh_encap, 1485b513bd03SDavid Ahern .fc_encap_type = cfg->nh_encap_type, 1486597cfe4fSDavid Ahern }; 148738428d68SRoopa Prabhu u32 tb_id = (cfg->dev ? l3mdev_fib_table(cfg->dev) : RT_TABLE_MAIN); 1488c76c9925SColin Ian King int err; 1489597cfe4fSDavid Ahern 1490597cfe4fSDavid Ahern err = fib_nh_init(net, fib_nh, &fib_cfg, 1, extack); 1491597cfe4fSDavid Ahern if (err) { 1492597cfe4fSDavid Ahern fib_nh_release(net, fib_nh); 1493597cfe4fSDavid Ahern goto out; 1494597cfe4fSDavid Ahern } 1495597cfe4fSDavid Ahern 1496ce9ac056SDavid Ahern if (nhi->fdb_nh) 149738428d68SRoopa Prabhu goto out; 149838428d68SRoopa Prabhu 1499597cfe4fSDavid Ahern /* sets nh_dev if successful */ 1500597cfe4fSDavid Ahern err = fib_check_nh(net, fib_nh, tb_id, 0, extack); 1501597cfe4fSDavid Ahern if (!err) { 1502597cfe4fSDavid Ahern nh->nh_flags = fib_nh->fib_nh_flags; 1503dcb1ecb5SDavid Ahern fib_info_update_nhc_saddr(net, &fib_nh->nh_common, 1504dcb1ecb5SDavid Ahern fib_nh->fib_nh_scope); 1505597cfe4fSDavid Ahern } else { 1506597cfe4fSDavid Ahern fib_nh_release(net, fib_nh); 1507597cfe4fSDavid Ahern } 1508597cfe4fSDavid Ahern out: 1509597cfe4fSDavid Ahern return err; 1510597cfe4fSDavid Ahern } 1511597cfe4fSDavid Ahern 151253010f99SDavid Ahern static int nh_create_ipv6(struct net *net, struct nexthop *nh, 151353010f99SDavid Ahern struct nh_info *nhi, struct nh_config *cfg, 151453010f99SDavid Ahern struct netlink_ext_ack *extack) 151553010f99SDavid Ahern { 151653010f99SDavid Ahern struct fib6_nh *fib6_nh = &nhi->fib6_nh; 151753010f99SDavid Ahern struct fib6_config fib6_cfg = { 151853010f99SDavid Ahern .fc_table = l3mdev_fib_table(cfg->dev), 151953010f99SDavid Ahern .fc_ifindex = cfg->nh_ifindex, 152053010f99SDavid Ahern .fc_gateway = cfg->gw.ipv6, 152153010f99SDavid Ahern .fc_flags = cfg->nh_flags, 1522b513bd03SDavid Ahern .fc_encap = cfg->nh_encap, 1523b513bd03SDavid Ahern .fc_encap_type = cfg->nh_encap_type, 152438428d68SRoopa Prabhu .fc_is_fdb = cfg->nh_fdb, 152553010f99SDavid Ahern }; 15266f43e525SColin Ian King int err; 152753010f99SDavid Ahern 152853010f99SDavid Ahern if (!ipv6_addr_any(&cfg->gw.ipv6)) 152953010f99SDavid Ahern fib6_cfg.fc_flags |= RTF_GATEWAY; 153053010f99SDavid Ahern 153153010f99SDavid Ahern /* sets nh_dev if successful */ 153253010f99SDavid Ahern err = ipv6_stub->fib6_nh_init(net, fib6_nh, &fib6_cfg, GFP_KERNEL, 153353010f99SDavid Ahern extack); 153453010f99SDavid Ahern if (err) 153553010f99SDavid Ahern ipv6_stub->fib6_nh_release(fib6_nh); 153653010f99SDavid Ahern else 153753010f99SDavid Ahern nh->nh_flags = fib6_nh->fib_nh_flags; 153853010f99SDavid Ahern 153953010f99SDavid Ahern return err; 154053010f99SDavid Ahern } 154153010f99SDavid Ahern 1542ab84be7eSDavid Ahern static struct nexthop *nexthop_create(struct net *net, struct nh_config *cfg, 1543ab84be7eSDavid Ahern struct netlink_ext_ack *extack) 1544ab84be7eSDavid Ahern { 1545ab84be7eSDavid Ahern struct nh_info *nhi; 1546ab84be7eSDavid Ahern struct nexthop *nh; 1547ab84be7eSDavid Ahern int err = 0; 1548ab84be7eSDavid Ahern 1549ab84be7eSDavid Ahern nh = nexthop_alloc(); 1550ab84be7eSDavid Ahern if (!nh) 1551ab84be7eSDavid Ahern return ERR_PTR(-ENOMEM); 1552ab84be7eSDavid Ahern 1553ab84be7eSDavid Ahern nhi = kzalloc(sizeof(*nhi), GFP_KERNEL); 1554ab84be7eSDavid Ahern if (!nhi) { 1555ab84be7eSDavid Ahern kfree(nh); 1556ab84be7eSDavid Ahern return ERR_PTR(-ENOMEM); 1557ab84be7eSDavid Ahern } 1558ab84be7eSDavid Ahern 1559ab84be7eSDavid Ahern nh->nh_flags = cfg->nh_flags; 1560ab84be7eSDavid Ahern nh->net = net; 1561ab84be7eSDavid Ahern 1562ab84be7eSDavid Ahern nhi->nh_parent = nh; 1563ab84be7eSDavid Ahern nhi->family = cfg->nh_family; 1564ab84be7eSDavid Ahern nhi->fib_nhc.nhc_scope = RT_SCOPE_LINK; 1565ab84be7eSDavid Ahern 156638428d68SRoopa Prabhu if (cfg->nh_fdb) 1567ce9ac056SDavid Ahern nhi->fdb_nh = 1; 156838428d68SRoopa Prabhu 1569ab84be7eSDavid Ahern if (cfg->nh_blackhole) { 1570ab84be7eSDavid Ahern nhi->reject_nh = 1; 1571ab84be7eSDavid Ahern cfg->nh_ifindex = net->loopback_dev->ifindex; 1572ab84be7eSDavid Ahern } 1573ab84be7eSDavid Ahern 1574597cfe4fSDavid Ahern switch (cfg->nh_family) { 1575597cfe4fSDavid Ahern case AF_INET: 1576597cfe4fSDavid Ahern err = nh_create_ipv4(net, nh, nhi, cfg, extack); 1577597cfe4fSDavid Ahern break; 157853010f99SDavid Ahern case AF_INET6: 157953010f99SDavid Ahern err = nh_create_ipv6(net, nh, nhi, cfg, extack); 158053010f99SDavid Ahern break; 1581597cfe4fSDavid Ahern } 1582597cfe4fSDavid Ahern 1583ab84be7eSDavid Ahern if (err) { 1584ab84be7eSDavid Ahern kfree(nhi); 1585ab84be7eSDavid Ahern kfree(nh); 1586ab84be7eSDavid Ahern return ERR_PTR(err); 1587ab84be7eSDavid Ahern } 1588ab84be7eSDavid Ahern 1589597cfe4fSDavid Ahern /* add the entry to the device based hash */ 1590ce9ac056SDavid Ahern if (!nhi->fdb_nh) 1591597cfe4fSDavid Ahern nexthop_devhash_add(net, nhi); 1592597cfe4fSDavid Ahern 1593ab84be7eSDavid Ahern rcu_assign_pointer(nh->nh_info, nhi); 1594ab84be7eSDavid Ahern 1595ab84be7eSDavid Ahern return nh; 1596ab84be7eSDavid Ahern } 1597ab84be7eSDavid Ahern 1598ab84be7eSDavid Ahern /* called with rtnl lock held */ 1599ab84be7eSDavid Ahern static struct nexthop *nexthop_add(struct net *net, struct nh_config *cfg, 1600ab84be7eSDavid Ahern struct netlink_ext_ack *extack) 1601ab84be7eSDavid Ahern { 1602ab84be7eSDavid Ahern struct nexthop *nh; 1603ab84be7eSDavid Ahern int err; 1604ab84be7eSDavid Ahern 1605ab84be7eSDavid Ahern if (cfg->nlflags & NLM_F_REPLACE && !cfg->nh_id) { 1606ab84be7eSDavid Ahern NL_SET_ERR_MSG(extack, "Replace requires nexthop id"); 1607ab84be7eSDavid Ahern return ERR_PTR(-EINVAL); 1608ab84be7eSDavid Ahern } 1609ab84be7eSDavid Ahern 1610ab84be7eSDavid Ahern if (!cfg->nh_id) { 1611ab84be7eSDavid Ahern cfg->nh_id = nh_find_unused_id(net); 1612ab84be7eSDavid Ahern if (!cfg->nh_id) { 1613ab84be7eSDavid Ahern NL_SET_ERR_MSG(extack, "No unused id"); 1614ab84be7eSDavid Ahern return ERR_PTR(-EINVAL); 1615ab84be7eSDavid Ahern } 1616ab84be7eSDavid Ahern } 1617ab84be7eSDavid Ahern 1618430a0491SDavid Ahern if (cfg->nh_grp) 1619430a0491SDavid Ahern nh = nexthop_create_group(net, cfg); 1620430a0491SDavid Ahern else 1621ab84be7eSDavid Ahern nh = nexthop_create(net, cfg, extack); 1622430a0491SDavid Ahern 1623ab84be7eSDavid Ahern if (IS_ERR(nh)) 1624ab84be7eSDavid Ahern return nh; 1625ab84be7eSDavid Ahern 1626ab84be7eSDavid Ahern refcount_set(&nh->refcnt, 1); 1627ab84be7eSDavid Ahern nh->id = cfg->nh_id; 1628ab84be7eSDavid Ahern nh->protocol = cfg->nh_protocol; 1629ab84be7eSDavid Ahern nh->net = net; 1630ab84be7eSDavid Ahern 1631ab84be7eSDavid Ahern err = insert_nexthop(net, nh, cfg, extack); 1632ab84be7eSDavid Ahern if (err) { 1633430a0491SDavid Ahern __remove_nexthop(net, nh, NULL); 1634ab84be7eSDavid Ahern nexthop_put(nh); 1635ab84be7eSDavid Ahern nh = ERR_PTR(err); 1636ab84be7eSDavid Ahern } 1637ab84be7eSDavid Ahern 1638ab84be7eSDavid Ahern return nh; 1639ab84be7eSDavid Ahern } 1640ab84be7eSDavid Ahern 1641ab84be7eSDavid Ahern static int rtm_to_nh_config(struct net *net, struct sk_buff *skb, 1642ab84be7eSDavid Ahern struct nlmsghdr *nlh, struct nh_config *cfg, 1643ab84be7eSDavid Ahern struct netlink_ext_ack *extack) 1644ab84be7eSDavid Ahern { 1645ab84be7eSDavid Ahern struct nhmsg *nhm = nlmsg_data(nlh); 1646ab84be7eSDavid Ahern struct nlattr *tb[NHA_MAX + 1]; 1647ab84be7eSDavid Ahern int err; 1648ab84be7eSDavid Ahern 1649ab84be7eSDavid Ahern err = nlmsg_parse(nlh, sizeof(*nhm), tb, NHA_MAX, rtm_nh_policy, 1650ab84be7eSDavid Ahern extack); 1651ab84be7eSDavid Ahern if (err < 0) 1652ab84be7eSDavid Ahern return err; 1653ab84be7eSDavid Ahern 1654ab84be7eSDavid Ahern err = -EINVAL; 1655ab84be7eSDavid Ahern if (nhm->resvd || nhm->nh_scope) { 1656ab84be7eSDavid Ahern NL_SET_ERR_MSG(extack, "Invalid values in ancillary header"); 1657ab84be7eSDavid Ahern goto out; 1658ab84be7eSDavid Ahern } 1659ab84be7eSDavid Ahern if (nhm->nh_flags & ~NEXTHOP_VALID_USER_FLAGS) { 1660ab84be7eSDavid Ahern NL_SET_ERR_MSG(extack, "Invalid nexthop flags in ancillary header"); 1661ab84be7eSDavid Ahern goto out; 1662ab84be7eSDavid Ahern } 1663ab84be7eSDavid Ahern 1664ab84be7eSDavid Ahern switch (nhm->nh_family) { 1665597cfe4fSDavid Ahern case AF_INET: 166653010f99SDavid Ahern case AF_INET6: 1667597cfe4fSDavid Ahern break; 1668430a0491SDavid Ahern case AF_UNSPEC: 1669430a0491SDavid Ahern if (tb[NHA_GROUP]) 1670430a0491SDavid Ahern break; 1671a8eceea8SJoe Perches fallthrough; 1672ab84be7eSDavid Ahern default: 1673ab84be7eSDavid Ahern NL_SET_ERR_MSG(extack, "Invalid address family"); 1674ab84be7eSDavid Ahern goto out; 1675ab84be7eSDavid Ahern } 1676ab84be7eSDavid Ahern 1677ab84be7eSDavid Ahern if (tb[NHA_GROUPS] || tb[NHA_MASTER]) { 1678ab84be7eSDavid Ahern NL_SET_ERR_MSG(extack, "Invalid attributes in request"); 1679ab84be7eSDavid Ahern goto out; 1680ab84be7eSDavid Ahern } 1681ab84be7eSDavid Ahern 1682ab84be7eSDavid Ahern memset(cfg, 0, sizeof(*cfg)); 1683ab84be7eSDavid Ahern cfg->nlflags = nlh->nlmsg_flags; 1684ab84be7eSDavid Ahern cfg->nlinfo.portid = NETLINK_CB(skb).portid; 1685ab84be7eSDavid Ahern cfg->nlinfo.nlh = nlh; 1686ab84be7eSDavid Ahern cfg->nlinfo.nl_net = net; 1687ab84be7eSDavid Ahern 1688ab84be7eSDavid Ahern cfg->nh_family = nhm->nh_family; 1689ab84be7eSDavid Ahern cfg->nh_protocol = nhm->nh_protocol; 1690ab84be7eSDavid Ahern cfg->nh_flags = nhm->nh_flags; 1691ab84be7eSDavid Ahern 1692ab84be7eSDavid Ahern if (tb[NHA_ID]) 1693ab84be7eSDavid Ahern cfg->nh_id = nla_get_u32(tb[NHA_ID]); 1694ab84be7eSDavid Ahern 169538428d68SRoopa Prabhu if (tb[NHA_FDB]) { 169638428d68SRoopa Prabhu if (tb[NHA_OIF] || tb[NHA_BLACKHOLE] || 169738428d68SRoopa Prabhu tb[NHA_ENCAP] || tb[NHA_ENCAP_TYPE]) { 169838428d68SRoopa Prabhu NL_SET_ERR_MSG(extack, "Fdb attribute can not be used with encap, oif or blackhole"); 169938428d68SRoopa Prabhu goto out; 170038428d68SRoopa Prabhu } 170138428d68SRoopa Prabhu if (nhm->nh_flags) { 170238428d68SRoopa Prabhu NL_SET_ERR_MSG(extack, "Unsupported nexthop flags in ancillary header"); 170338428d68SRoopa Prabhu goto out; 170438428d68SRoopa Prabhu } 170538428d68SRoopa Prabhu cfg->nh_fdb = nla_get_flag(tb[NHA_FDB]); 170638428d68SRoopa Prabhu } 170738428d68SRoopa Prabhu 1708430a0491SDavid Ahern if (tb[NHA_GROUP]) { 1709430a0491SDavid Ahern if (nhm->nh_family != AF_UNSPEC) { 1710430a0491SDavid Ahern NL_SET_ERR_MSG(extack, "Invalid family for group"); 1711430a0491SDavid Ahern goto out; 1712430a0491SDavid Ahern } 1713430a0491SDavid Ahern cfg->nh_grp = tb[NHA_GROUP]; 1714430a0491SDavid Ahern 1715430a0491SDavid Ahern cfg->nh_grp_type = NEXTHOP_GRP_TYPE_MPATH; 1716430a0491SDavid Ahern if (tb[NHA_GROUP_TYPE]) 1717430a0491SDavid Ahern cfg->nh_grp_type = nla_get_u16(tb[NHA_GROUP_TYPE]); 1718430a0491SDavid Ahern 1719430a0491SDavid Ahern if (cfg->nh_grp_type > NEXTHOP_GRP_TYPE_MAX) { 1720430a0491SDavid Ahern NL_SET_ERR_MSG(extack, "Invalid group type"); 1721430a0491SDavid Ahern goto out; 1722430a0491SDavid Ahern } 1723430a0491SDavid Ahern err = nh_check_attr_group(net, tb, extack); 1724430a0491SDavid Ahern 1725430a0491SDavid Ahern /* no other attributes should be set */ 1726430a0491SDavid Ahern goto out; 1727430a0491SDavid Ahern } 1728430a0491SDavid Ahern 1729ab84be7eSDavid Ahern if (tb[NHA_BLACKHOLE]) { 1730b513bd03SDavid Ahern if (tb[NHA_GATEWAY] || tb[NHA_OIF] || 173138428d68SRoopa Prabhu tb[NHA_ENCAP] || tb[NHA_ENCAP_TYPE] || tb[NHA_FDB]) { 173238428d68SRoopa Prabhu NL_SET_ERR_MSG(extack, "Blackhole attribute can not be used with gateway, oif, encap or fdb"); 1733ab84be7eSDavid Ahern goto out; 1734ab84be7eSDavid Ahern } 1735ab84be7eSDavid Ahern 1736ab84be7eSDavid Ahern cfg->nh_blackhole = 1; 1737ab84be7eSDavid Ahern err = 0; 1738ab84be7eSDavid Ahern goto out; 1739ab84be7eSDavid Ahern } 1740ab84be7eSDavid Ahern 174138428d68SRoopa Prabhu if (!cfg->nh_fdb && !tb[NHA_OIF]) { 174238428d68SRoopa Prabhu NL_SET_ERR_MSG(extack, "Device attribute required for non-blackhole and non-fdb nexthops"); 1743ab84be7eSDavid Ahern goto out; 1744ab84be7eSDavid Ahern } 1745ab84be7eSDavid Ahern 174638428d68SRoopa Prabhu if (!cfg->nh_fdb && tb[NHA_OIF]) { 1747ab84be7eSDavid Ahern cfg->nh_ifindex = nla_get_u32(tb[NHA_OIF]); 1748ab84be7eSDavid Ahern if (cfg->nh_ifindex) 1749ab84be7eSDavid Ahern cfg->dev = __dev_get_by_index(net, cfg->nh_ifindex); 1750ab84be7eSDavid Ahern 1751ab84be7eSDavid Ahern if (!cfg->dev) { 1752ab84be7eSDavid Ahern NL_SET_ERR_MSG(extack, "Invalid device index"); 1753ab84be7eSDavid Ahern goto out; 1754ab84be7eSDavid Ahern } else if (!(cfg->dev->flags & IFF_UP)) { 1755ab84be7eSDavid Ahern NL_SET_ERR_MSG(extack, "Nexthop device is not up"); 1756ab84be7eSDavid Ahern err = -ENETDOWN; 1757ab84be7eSDavid Ahern goto out; 1758ab84be7eSDavid Ahern } else if (!netif_carrier_ok(cfg->dev)) { 1759ab84be7eSDavid Ahern NL_SET_ERR_MSG(extack, "Carrier for nexthop device is down"); 1760ab84be7eSDavid Ahern err = -ENETDOWN; 1761ab84be7eSDavid Ahern goto out; 1762ab84be7eSDavid Ahern } 176338428d68SRoopa Prabhu } 1764ab84be7eSDavid Ahern 1765597cfe4fSDavid Ahern err = -EINVAL; 1766597cfe4fSDavid Ahern if (tb[NHA_GATEWAY]) { 1767597cfe4fSDavid Ahern struct nlattr *gwa = tb[NHA_GATEWAY]; 1768597cfe4fSDavid Ahern 1769597cfe4fSDavid Ahern switch (cfg->nh_family) { 1770597cfe4fSDavid Ahern case AF_INET: 1771597cfe4fSDavid Ahern if (nla_len(gwa) != sizeof(u32)) { 1772597cfe4fSDavid Ahern NL_SET_ERR_MSG(extack, "Invalid gateway"); 1773597cfe4fSDavid Ahern goto out; 1774597cfe4fSDavid Ahern } 1775597cfe4fSDavid Ahern cfg->gw.ipv4 = nla_get_be32(gwa); 1776597cfe4fSDavid Ahern break; 177753010f99SDavid Ahern case AF_INET6: 177853010f99SDavid Ahern if (nla_len(gwa) != sizeof(struct in6_addr)) { 177953010f99SDavid Ahern NL_SET_ERR_MSG(extack, "Invalid gateway"); 178053010f99SDavid Ahern goto out; 178153010f99SDavid Ahern } 178253010f99SDavid Ahern cfg->gw.ipv6 = nla_get_in6_addr(gwa); 178353010f99SDavid Ahern break; 1784597cfe4fSDavid Ahern default: 1785597cfe4fSDavid Ahern NL_SET_ERR_MSG(extack, 1786597cfe4fSDavid Ahern "Unknown address family for gateway"); 1787597cfe4fSDavid Ahern goto out; 1788597cfe4fSDavid Ahern } 1789597cfe4fSDavid Ahern } else { 1790597cfe4fSDavid Ahern /* device only nexthop (no gateway) */ 1791597cfe4fSDavid Ahern if (cfg->nh_flags & RTNH_F_ONLINK) { 1792597cfe4fSDavid Ahern NL_SET_ERR_MSG(extack, 1793597cfe4fSDavid Ahern "ONLINK flag can not be set for nexthop without a gateway"); 1794597cfe4fSDavid Ahern goto out; 1795597cfe4fSDavid Ahern } 1796597cfe4fSDavid Ahern } 1797597cfe4fSDavid Ahern 1798b513bd03SDavid Ahern if (tb[NHA_ENCAP]) { 1799b513bd03SDavid Ahern cfg->nh_encap = tb[NHA_ENCAP]; 1800b513bd03SDavid Ahern 1801b513bd03SDavid Ahern if (!tb[NHA_ENCAP_TYPE]) { 1802b513bd03SDavid Ahern NL_SET_ERR_MSG(extack, "LWT encapsulation type is missing"); 1803b513bd03SDavid Ahern goto out; 1804b513bd03SDavid Ahern } 1805b513bd03SDavid Ahern 1806b513bd03SDavid Ahern cfg->nh_encap_type = nla_get_u16(tb[NHA_ENCAP_TYPE]); 1807b513bd03SDavid Ahern err = lwtunnel_valid_encap_type(cfg->nh_encap_type, extack); 1808b513bd03SDavid Ahern if (err < 0) 1809b513bd03SDavid Ahern goto out; 1810b513bd03SDavid Ahern 1811b513bd03SDavid Ahern } else if (tb[NHA_ENCAP_TYPE]) { 1812b513bd03SDavid Ahern NL_SET_ERR_MSG(extack, "LWT encapsulation attribute is missing"); 1813b513bd03SDavid Ahern goto out; 1814b513bd03SDavid Ahern } 1815b513bd03SDavid Ahern 1816b513bd03SDavid Ahern 1817ab84be7eSDavid Ahern err = 0; 1818ab84be7eSDavid Ahern out: 1819ab84be7eSDavid Ahern return err; 1820ab84be7eSDavid Ahern } 1821ab84be7eSDavid Ahern 1822ab84be7eSDavid Ahern /* rtnl */ 1823ab84be7eSDavid Ahern static int rtm_new_nexthop(struct sk_buff *skb, struct nlmsghdr *nlh, 1824ab84be7eSDavid Ahern struct netlink_ext_ack *extack) 1825ab84be7eSDavid Ahern { 1826ab84be7eSDavid Ahern struct net *net = sock_net(skb->sk); 1827ab84be7eSDavid Ahern struct nh_config cfg; 1828ab84be7eSDavid Ahern struct nexthop *nh; 1829ab84be7eSDavid Ahern int err; 1830ab84be7eSDavid Ahern 1831ab84be7eSDavid Ahern err = rtm_to_nh_config(net, skb, nlh, &cfg, extack); 1832ab84be7eSDavid Ahern if (!err) { 1833ab84be7eSDavid Ahern nh = nexthop_add(net, &cfg, extack); 1834ab84be7eSDavid Ahern if (IS_ERR(nh)) 1835ab84be7eSDavid Ahern err = PTR_ERR(nh); 1836ab84be7eSDavid Ahern } 1837ab84be7eSDavid Ahern 1838ab84be7eSDavid Ahern return err; 1839ab84be7eSDavid Ahern } 1840ab84be7eSDavid Ahern 1841ab84be7eSDavid Ahern static int nh_valid_get_del_req(struct nlmsghdr *nlh, u32 *id, 1842ab84be7eSDavid Ahern struct netlink_ext_ack *extack) 1843ab84be7eSDavid Ahern { 1844ab84be7eSDavid Ahern struct nhmsg *nhm = nlmsg_data(nlh); 1845ab84be7eSDavid Ahern struct nlattr *tb[NHA_MAX + 1]; 1846ab84be7eSDavid Ahern int err, i; 1847ab84be7eSDavid Ahern 1848ab84be7eSDavid Ahern err = nlmsg_parse(nlh, sizeof(*nhm), tb, NHA_MAX, rtm_nh_policy, 1849ab84be7eSDavid Ahern extack); 1850ab84be7eSDavid Ahern if (err < 0) 1851ab84be7eSDavid Ahern return err; 1852ab84be7eSDavid Ahern 1853ab84be7eSDavid Ahern err = -EINVAL; 1854ab84be7eSDavid Ahern for (i = 0; i < __NHA_MAX; ++i) { 1855ab84be7eSDavid Ahern if (!tb[i]) 1856ab84be7eSDavid Ahern continue; 1857ab84be7eSDavid Ahern 1858ab84be7eSDavid Ahern switch (i) { 1859ab84be7eSDavid Ahern case NHA_ID: 1860ab84be7eSDavid Ahern break; 1861ab84be7eSDavid Ahern default: 1862ab84be7eSDavid Ahern NL_SET_ERR_MSG_ATTR(extack, tb[i], 1863ab84be7eSDavid Ahern "Unexpected attribute in request"); 1864ab84be7eSDavid Ahern goto out; 1865ab84be7eSDavid Ahern } 1866ab84be7eSDavid Ahern } 1867ab84be7eSDavid Ahern if (nhm->nh_protocol || nhm->resvd || nhm->nh_scope || nhm->nh_flags) { 1868ab84be7eSDavid Ahern NL_SET_ERR_MSG(extack, "Invalid values in header"); 1869ab84be7eSDavid Ahern goto out; 1870ab84be7eSDavid Ahern } 1871ab84be7eSDavid Ahern 1872ab84be7eSDavid Ahern if (!tb[NHA_ID]) { 1873ab84be7eSDavid Ahern NL_SET_ERR_MSG(extack, "Nexthop id is missing"); 1874ab84be7eSDavid Ahern goto out; 1875ab84be7eSDavid Ahern } 1876ab84be7eSDavid Ahern 1877ab84be7eSDavid Ahern *id = nla_get_u32(tb[NHA_ID]); 1878ab84be7eSDavid Ahern if (!(*id)) 1879ab84be7eSDavid Ahern NL_SET_ERR_MSG(extack, "Invalid nexthop id"); 1880ab84be7eSDavid Ahern else 1881ab84be7eSDavid Ahern err = 0; 1882ab84be7eSDavid Ahern out: 1883ab84be7eSDavid Ahern return err; 1884ab84be7eSDavid Ahern } 1885ab84be7eSDavid Ahern 1886ab84be7eSDavid Ahern /* rtnl */ 1887ab84be7eSDavid Ahern static int rtm_del_nexthop(struct sk_buff *skb, struct nlmsghdr *nlh, 1888ab84be7eSDavid Ahern struct netlink_ext_ack *extack) 1889ab84be7eSDavid Ahern { 1890ab84be7eSDavid Ahern struct net *net = sock_net(skb->sk); 1891ab84be7eSDavid Ahern struct nl_info nlinfo = { 1892ab84be7eSDavid Ahern .nlh = nlh, 1893ab84be7eSDavid Ahern .nl_net = net, 1894ab84be7eSDavid Ahern .portid = NETLINK_CB(skb).portid, 1895ab84be7eSDavid Ahern }; 1896ab84be7eSDavid Ahern struct nexthop *nh; 1897ab84be7eSDavid Ahern int err; 1898ab84be7eSDavid Ahern u32 id; 1899ab84be7eSDavid Ahern 1900ab84be7eSDavid Ahern err = nh_valid_get_del_req(nlh, &id, extack); 1901ab84be7eSDavid Ahern if (err) 1902ab84be7eSDavid Ahern return err; 1903ab84be7eSDavid Ahern 1904ab84be7eSDavid Ahern nh = nexthop_find_by_id(net, id); 1905ab84be7eSDavid Ahern if (!nh) 1906ab84be7eSDavid Ahern return -ENOENT; 1907ab84be7eSDavid Ahern 1908430a0491SDavid Ahern remove_nexthop(net, nh, &nlinfo); 1909ab84be7eSDavid Ahern 1910ab84be7eSDavid Ahern return 0; 1911ab84be7eSDavid Ahern } 1912ab84be7eSDavid Ahern 1913ab84be7eSDavid Ahern /* rtnl */ 1914ab84be7eSDavid Ahern static int rtm_get_nexthop(struct sk_buff *in_skb, struct nlmsghdr *nlh, 1915ab84be7eSDavid Ahern struct netlink_ext_ack *extack) 1916ab84be7eSDavid Ahern { 1917ab84be7eSDavid Ahern struct net *net = sock_net(in_skb->sk); 1918ab84be7eSDavid Ahern struct sk_buff *skb = NULL; 1919ab84be7eSDavid Ahern struct nexthop *nh; 1920ab84be7eSDavid Ahern int err; 1921ab84be7eSDavid Ahern u32 id; 1922ab84be7eSDavid Ahern 1923ab84be7eSDavid Ahern err = nh_valid_get_del_req(nlh, &id, extack); 1924ab84be7eSDavid Ahern if (err) 1925ab84be7eSDavid Ahern return err; 1926ab84be7eSDavid Ahern 1927ab84be7eSDavid Ahern err = -ENOBUFS; 1928ab84be7eSDavid Ahern skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); 1929ab84be7eSDavid Ahern if (!skb) 1930ab84be7eSDavid Ahern goto out; 1931ab84be7eSDavid Ahern 1932ab84be7eSDavid Ahern err = -ENOENT; 1933ab84be7eSDavid Ahern nh = nexthop_find_by_id(net, id); 1934ab84be7eSDavid Ahern if (!nh) 1935ab84be7eSDavid Ahern goto errout_free; 1936ab84be7eSDavid Ahern 1937ab84be7eSDavid Ahern err = nh_fill_node(skb, nh, RTM_NEWNEXTHOP, NETLINK_CB(in_skb).portid, 1938ab84be7eSDavid Ahern nlh->nlmsg_seq, 0); 1939ab84be7eSDavid Ahern if (err < 0) { 1940ab84be7eSDavid Ahern WARN_ON(err == -EMSGSIZE); 1941ab84be7eSDavid Ahern goto errout_free; 1942ab84be7eSDavid Ahern } 1943ab84be7eSDavid Ahern 1944ab84be7eSDavid Ahern err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 1945ab84be7eSDavid Ahern out: 1946ab84be7eSDavid Ahern return err; 1947ab84be7eSDavid Ahern errout_free: 1948ab84be7eSDavid Ahern kfree_skb(skb); 1949ab84be7eSDavid Ahern goto out; 1950ab84be7eSDavid Ahern } 1951ab84be7eSDavid Ahern 1952430a0491SDavid Ahern static bool nh_dump_filtered(struct nexthop *nh, int dev_idx, int master_idx, 1953430a0491SDavid Ahern bool group_filter, u8 family) 1954ab84be7eSDavid Ahern { 1955ab84be7eSDavid Ahern const struct net_device *dev; 1956ab84be7eSDavid Ahern const struct nh_info *nhi; 1957ab84be7eSDavid Ahern 1958430a0491SDavid Ahern if (group_filter && !nh->is_group) 1959430a0491SDavid Ahern return true; 1960430a0491SDavid Ahern 1961ab84be7eSDavid Ahern if (!dev_idx && !master_idx && !family) 1962ab84be7eSDavid Ahern return false; 1963ab84be7eSDavid Ahern 1964430a0491SDavid Ahern if (nh->is_group) 1965430a0491SDavid Ahern return true; 1966430a0491SDavid Ahern 1967ab84be7eSDavid Ahern nhi = rtnl_dereference(nh->nh_info); 1968ab84be7eSDavid Ahern if (family && nhi->family != family) 1969ab84be7eSDavid Ahern return true; 1970ab84be7eSDavid Ahern 1971ab84be7eSDavid Ahern dev = nhi->fib_nhc.nhc_dev; 1972ab84be7eSDavid Ahern if (dev_idx && (!dev || dev->ifindex != dev_idx)) 1973ab84be7eSDavid Ahern return true; 1974ab84be7eSDavid Ahern 1975ab84be7eSDavid Ahern if (master_idx) { 1976ab84be7eSDavid Ahern struct net_device *master; 1977ab84be7eSDavid Ahern 1978ab84be7eSDavid Ahern if (!dev) 1979ab84be7eSDavid Ahern return true; 1980ab84be7eSDavid Ahern 1981ab84be7eSDavid Ahern master = netdev_master_upper_dev_get((struct net_device *)dev); 1982ab84be7eSDavid Ahern if (!master || master->ifindex != master_idx) 1983ab84be7eSDavid Ahern return true; 1984ab84be7eSDavid Ahern } 1985ab84be7eSDavid Ahern 1986ab84be7eSDavid Ahern return false; 1987ab84be7eSDavid Ahern } 1988ab84be7eSDavid Ahern 1989430a0491SDavid Ahern static int nh_valid_dump_req(const struct nlmsghdr *nlh, int *dev_idx, 1990430a0491SDavid Ahern int *master_idx, bool *group_filter, 199138428d68SRoopa Prabhu bool *fdb_filter, struct netlink_callback *cb) 1992ab84be7eSDavid Ahern { 1993ab84be7eSDavid Ahern struct netlink_ext_ack *extack = cb->extack; 1994ab84be7eSDavid Ahern struct nlattr *tb[NHA_MAX + 1]; 1995ab84be7eSDavid Ahern struct nhmsg *nhm; 1996ab84be7eSDavid Ahern int err, i; 1997ab84be7eSDavid Ahern u32 idx; 1998ab84be7eSDavid Ahern 1999ab84be7eSDavid Ahern err = nlmsg_parse(nlh, sizeof(*nhm), tb, NHA_MAX, rtm_nh_policy, 2000ab84be7eSDavid Ahern NULL); 2001ab84be7eSDavid Ahern if (err < 0) 2002ab84be7eSDavid Ahern return err; 2003ab84be7eSDavid Ahern 2004ab84be7eSDavid Ahern for (i = 0; i <= NHA_MAX; ++i) { 2005ab84be7eSDavid Ahern if (!tb[i]) 2006ab84be7eSDavid Ahern continue; 2007ab84be7eSDavid Ahern 2008ab84be7eSDavid Ahern switch (i) { 2009ab84be7eSDavid Ahern case NHA_OIF: 2010ab84be7eSDavid Ahern idx = nla_get_u32(tb[i]); 2011ab84be7eSDavid Ahern if (idx > INT_MAX) { 2012ab84be7eSDavid Ahern NL_SET_ERR_MSG(extack, "Invalid device index"); 2013ab84be7eSDavid Ahern return -EINVAL; 2014ab84be7eSDavid Ahern } 2015ab84be7eSDavid Ahern *dev_idx = idx; 2016ab84be7eSDavid Ahern break; 2017ab84be7eSDavid Ahern case NHA_MASTER: 2018ab84be7eSDavid Ahern idx = nla_get_u32(tb[i]); 2019ab84be7eSDavid Ahern if (idx > INT_MAX) { 2020ab84be7eSDavid Ahern NL_SET_ERR_MSG(extack, "Invalid master device index"); 2021ab84be7eSDavid Ahern return -EINVAL; 2022ab84be7eSDavid Ahern } 2023ab84be7eSDavid Ahern *master_idx = idx; 2024ab84be7eSDavid Ahern break; 2025430a0491SDavid Ahern case NHA_GROUPS: 2026430a0491SDavid Ahern *group_filter = true; 2027430a0491SDavid Ahern break; 202838428d68SRoopa Prabhu case NHA_FDB: 202938428d68SRoopa Prabhu *fdb_filter = true; 203038428d68SRoopa Prabhu break; 2031ab84be7eSDavid Ahern default: 2032ab84be7eSDavid Ahern NL_SET_ERR_MSG(extack, "Unsupported attribute in dump request"); 2033ab84be7eSDavid Ahern return -EINVAL; 2034ab84be7eSDavid Ahern } 2035ab84be7eSDavid Ahern } 2036ab84be7eSDavid Ahern 2037ab84be7eSDavid Ahern nhm = nlmsg_data(nlh); 2038ab84be7eSDavid Ahern if (nhm->nh_protocol || nhm->resvd || nhm->nh_scope || nhm->nh_flags) { 2039ab84be7eSDavid Ahern NL_SET_ERR_MSG(extack, "Invalid values in header for nexthop dump request"); 2040ab84be7eSDavid Ahern return -EINVAL; 2041ab84be7eSDavid Ahern } 2042ab84be7eSDavid Ahern 2043ab84be7eSDavid Ahern return 0; 2044ab84be7eSDavid Ahern } 2045ab84be7eSDavid Ahern 2046ab84be7eSDavid Ahern /* rtnl */ 2047ab84be7eSDavid Ahern static int rtm_dump_nexthop(struct sk_buff *skb, struct netlink_callback *cb) 2048ab84be7eSDavid Ahern { 204938428d68SRoopa Prabhu bool group_filter = false, fdb_filter = false; 2050ab84be7eSDavid Ahern struct nhmsg *nhm = nlmsg_data(cb->nlh); 2051ab84be7eSDavid Ahern int dev_filter_idx = 0, master_idx = 0; 2052ab84be7eSDavid Ahern struct net *net = sock_net(skb->sk); 2053ab84be7eSDavid Ahern struct rb_root *root = &net->nexthop.rb_root; 2054ab84be7eSDavid Ahern struct rb_node *node; 2055ab84be7eSDavid Ahern int idx = 0, s_idx; 2056ab84be7eSDavid Ahern int err; 2057ab84be7eSDavid Ahern 2058430a0491SDavid Ahern err = nh_valid_dump_req(cb->nlh, &dev_filter_idx, &master_idx, 205938428d68SRoopa Prabhu &group_filter, &fdb_filter, cb); 2060ab84be7eSDavid Ahern if (err < 0) 2061ab84be7eSDavid Ahern return err; 2062ab84be7eSDavid Ahern 2063ab84be7eSDavid Ahern s_idx = cb->args[0]; 2064ab84be7eSDavid Ahern for (node = rb_first(root); node; node = rb_next(node)) { 2065ab84be7eSDavid Ahern struct nexthop *nh; 2066ab84be7eSDavid Ahern 2067ab84be7eSDavid Ahern if (idx < s_idx) 2068ab84be7eSDavid Ahern goto cont; 2069ab84be7eSDavid Ahern 2070ab84be7eSDavid Ahern nh = rb_entry(node, struct nexthop, rb_node); 2071ab84be7eSDavid Ahern if (nh_dump_filtered(nh, dev_filter_idx, master_idx, 2072430a0491SDavid Ahern group_filter, nhm->nh_family)) 2073ab84be7eSDavid Ahern goto cont; 2074ab84be7eSDavid Ahern 2075ab84be7eSDavid Ahern err = nh_fill_node(skb, nh, RTM_NEWNEXTHOP, 2076ab84be7eSDavid Ahern NETLINK_CB(cb->skb).portid, 2077ab84be7eSDavid Ahern cb->nlh->nlmsg_seq, NLM_F_MULTI); 2078ab84be7eSDavid Ahern if (err < 0) { 2079ab84be7eSDavid Ahern if (likely(skb->len)) 2080ab84be7eSDavid Ahern goto out; 2081ab84be7eSDavid Ahern 2082ab84be7eSDavid Ahern goto out_err; 2083ab84be7eSDavid Ahern } 2084ab84be7eSDavid Ahern cont: 2085ab84be7eSDavid Ahern idx++; 2086ab84be7eSDavid Ahern } 2087ab84be7eSDavid Ahern 2088ab84be7eSDavid Ahern out: 2089ab84be7eSDavid Ahern err = skb->len; 2090ab84be7eSDavid Ahern out_err: 2091ab84be7eSDavid Ahern cb->args[0] = idx; 2092ab84be7eSDavid Ahern cb->seq = net->nexthop.seq; 2093ab84be7eSDavid Ahern nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 2094ab84be7eSDavid Ahern 2095ab84be7eSDavid Ahern return err; 2096ab84be7eSDavid Ahern } 2097ab84be7eSDavid Ahern 2098597cfe4fSDavid Ahern static void nexthop_sync_mtu(struct net_device *dev, u32 orig_mtu) 2099597cfe4fSDavid Ahern { 2100597cfe4fSDavid Ahern unsigned int hash = nh_dev_hashfn(dev->ifindex); 2101597cfe4fSDavid Ahern struct net *net = dev_net(dev); 2102597cfe4fSDavid Ahern struct hlist_head *head = &net->nexthop.devhash[hash]; 2103597cfe4fSDavid Ahern struct hlist_node *n; 2104597cfe4fSDavid Ahern struct nh_info *nhi; 2105597cfe4fSDavid Ahern 2106597cfe4fSDavid Ahern hlist_for_each_entry_safe(nhi, n, head, dev_hash) { 2107597cfe4fSDavid Ahern if (nhi->fib_nhc.nhc_dev == dev) { 2108597cfe4fSDavid Ahern if (nhi->family == AF_INET) 2109597cfe4fSDavid Ahern fib_nhc_update_mtu(&nhi->fib_nhc, dev->mtu, 2110597cfe4fSDavid Ahern orig_mtu); 2111597cfe4fSDavid Ahern } 2112597cfe4fSDavid Ahern } 2113597cfe4fSDavid Ahern } 2114597cfe4fSDavid Ahern 2115597cfe4fSDavid Ahern /* rtnl */ 2116597cfe4fSDavid Ahern static int nh_netdev_event(struct notifier_block *this, 2117597cfe4fSDavid Ahern unsigned long event, void *ptr) 2118597cfe4fSDavid Ahern { 2119597cfe4fSDavid Ahern struct net_device *dev = netdev_notifier_info_to_dev(ptr); 2120597cfe4fSDavid Ahern struct netdev_notifier_info_ext *info_ext; 2121597cfe4fSDavid Ahern 2122597cfe4fSDavid Ahern switch (event) { 2123597cfe4fSDavid Ahern case NETDEV_DOWN: 2124597cfe4fSDavid Ahern case NETDEV_UNREGISTER: 2125597cfe4fSDavid Ahern nexthop_flush_dev(dev); 2126597cfe4fSDavid Ahern break; 2127597cfe4fSDavid Ahern case NETDEV_CHANGE: 2128597cfe4fSDavid Ahern if (!(dev_get_flags(dev) & (IFF_RUNNING | IFF_LOWER_UP))) 2129597cfe4fSDavid Ahern nexthop_flush_dev(dev); 2130597cfe4fSDavid Ahern break; 2131597cfe4fSDavid Ahern case NETDEV_CHANGEMTU: 2132597cfe4fSDavid Ahern info_ext = ptr; 2133597cfe4fSDavid Ahern nexthop_sync_mtu(dev, info_ext->ext.mtu); 2134597cfe4fSDavid Ahern rt_cache_flush(dev_net(dev)); 2135597cfe4fSDavid Ahern break; 2136597cfe4fSDavid Ahern } 2137597cfe4fSDavid Ahern return NOTIFY_DONE; 2138597cfe4fSDavid Ahern } 2139597cfe4fSDavid Ahern 2140597cfe4fSDavid Ahern static struct notifier_block nh_netdev_notifier = { 2141597cfe4fSDavid Ahern .notifier_call = nh_netdev_event, 2142597cfe4fSDavid Ahern }; 2143597cfe4fSDavid Ahern 2144975ff7f3SIdo Schimmel static int nexthops_dump(struct net *net, struct notifier_block *nb, 2145975ff7f3SIdo Schimmel struct netlink_ext_ack *extack) 2146975ff7f3SIdo Schimmel { 2147975ff7f3SIdo Schimmel struct rb_root *root = &net->nexthop.rb_root; 2148975ff7f3SIdo Schimmel struct rb_node *node; 2149975ff7f3SIdo Schimmel int err = 0; 2150975ff7f3SIdo Schimmel 2151975ff7f3SIdo Schimmel for (node = rb_first(root); node; node = rb_next(node)) { 2152975ff7f3SIdo Schimmel struct nexthop *nh; 2153975ff7f3SIdo Schimmel 2154975ff7f3SIdo Schimmel nh = rb_entry(node, struct nexthop, rb_node); 2155975ff7f3SIdo Schimmel err = call_nexthop_notifier(nb, net, NEXTHOP_EVENT_REPLACE, nh, 2156975ff7f3SIdo Schimmel extack); 2157975ff7f3SIdo Schimmel if (err) 2158975ff7f3SIdo Schimmel break; 2159975ff7f3SIdo Schimmel } 2160975ff7f3SIdo Schimmel 2161975ff7f3SIdo Schimmel return err; 2162975ff7f3SIdo Schimmel } 2163975ff7f3SIdo Schimmel 2164ce7e9c8aSIdo Schimmel int register_nexthop_notifier(struct net *net, struct notifier_block *nb, 2165ce7e9c8aSIdo Schimmel struct netlink_ext_ack *extack) 21668590ceedSRoopa Prabhu { 2167975ff7f3SIdo Schimmel int err; 2168975ff7f3SIdo Schimmel 2169975ff7f3SIdo Schimmel rtnl_lock(); 2170975ff7f3SIdo Schimmel err = nexthops_dump(net, nb, extack); 2171975ff7f3SIdo Schimmel if (err) 2172975ff7f3SIdo Schimmel goto unlock; 2173975ff7f3SIdo Schimmel err = blocking_notifier_chain_register(&net->nexthop.notifier_chain, 217480690ec6SIdo Schimmel nb); 2175975ff7f3SIdo Schimmel unlock: 2176975ff7f3SIdo Schimmel rtnl_unlock(); 2177975ff7f3SIdo Schimmel return err; 21788590ceedSRoopa Prabhu } 21798590ceedSRoopa Prabhu EXPORT_SYMBOL(register_nexthop_notifier); 21808590ceedSRoopa Prabhu 21818590ceedSRoopa Prabhu int unregister_nexthop_notifier(struct net *net, struct notifier_block *nb) 21828590ceedSRoopa Prabhu { 218380690ec6SIdo Schimmel return blocking_notifier_chain_unregister(&net->nexthop.notifier_chain, 21848590ceedSRoopa Prabhu nb); 21858590ceedSRoopa Prabhu } 21868590ceedSRoopa Prabhu EXPORT_SYMBOL(unregister_nexthop_notifier); 21878590ceedSRoopa Prabhu 2188e95f2592SIdo Schimmel void nexthop_set_hw_flags(struct net *net, u32 id, bool offload, bool trap) 2189e95f2592SIdo Schimmel { 2190e95f2592SIdo Schimmel struct nexthop *nexthop; 2191e95f2592SIdo Schimmel 2192e95f2592SIdo Schimmel rcu_read_lock(); 2193e95f2592SIdo Schimmel 2194e95f2592SIdo Schimmel nexthop = nexthop_find_by_id(net, id); 2195e95f2592SIdo Schimmel if (!nexthop) 2196e95f2592SIdo Schimmel goto out; 2197e95f2592SIdo Schimmel 2198e95f2592SIdo Schimmel nexthop->nh_flags &= ~(RTNH_F_OFFLOAD | RTNH_F_TRAP); 2199e95f2592SIdo Schimmel if (offload) 2200e95f2592SIdo Schimmel nexthop->nh_flags |= RTNH_F_OFFLOAD; 2201e95f2592SIdo Schimmel if (trap) 2202e95f2592SIdo Schimmel nexthop->nh_flags |= RTNH_F_TRAP; 2203e95f2592SIdo Schimmel 2204e95f2592SIdo Schimmel out: 2205e95f2592SIdo Schimmel rcu_read_unlock(); 2206e95f2592SIdo Schimmel } 2207e95f2592SIdo Schimmel EXPORT_SYMBOL(nexthop_set_hw_flags); 2208e95f2592SIdo Schimmel 2209ab84be7eSDavid Ahern static void __net_exit nexthop_net_exit(struct net *net) 2210ab84be7eSDavid Ahern { 2211ab84be7eSDavid Ahern rtnl_lock(); 2212ab84be7eSDavid Ahern flush_all_nexthops(net); 2213ab84be7eSDavid Ahern rtnl_unlock(); 2214597cfe4fSDavid Ahern kfree(net->nexthop.devhash); 2215ab84be7eSDavid Ahern } 2216ab84be7eSDavid Ahern 2217ab84be7eSDavid Ahern static int __net_init nexthop_net_init(struct net *net) 2218ab84be7eSDavid Ahern { 2219597cfe4fSDavid Ahern size_t sz = sizeof(struct hlist_head) * NH_DEV_HASHSIZE; 2220597cfe4fSDavid Ahern 2221ab84be7eSDavid Ahern net->nexthop.rb_root = RB_ROOT; 2222597cfe4fSDavid Ahern net->nexthop.devhash = kzalloc(sz, GFP_KERNEL); 2223597cfe4fSDavid Ahern if (!net->nexthop.devhash) 2224597cfe4fSDavid Ahern return -ENOMEM; 222580690ec6SIdo Schimmel BLOCKING_INIT_NOTIFIER_HEAD(&net->nexthop.notifier_chain); 2226ab84be7eSDavid Ahern 2227ab84be7eSDavid Ahern return 0; 2228ab84be7eSDavid Ahern } 2229ab84be7eSDavid Ahern 2230ab84be7eSDavid Ahern static struct pernet_operations nexthop_net_ops = { 2231ab84be7eSDavid Ahern .init = nexthop_net_init, 2232ab84be7eSDavid Ahern .exit = nexthop_net_exit, 2233ab84be7eSDavid Ahern }; 2234ab84be7eSDavid Ahern 2235ab84be7eSDavid Ahern static int __init nexthop_init(void) 2236ab84be7eSDavid Ahern { 2237ab84be7eSDavid Ahern register_pernet_subsys(&nexthop_net_ops); 2238ab84be7eSDavid Ahern 2239597cfe4fSDavid Ahern register_netdevice_notifier(&nh_netdev_notifier); 2240597cfe4fSDavid Ahern 2241ab84be7eSDavid Ahern rtnl_register(PF_UNSPEC, RTM_NEWNEXTHOP, rtm_new_nexthop, NULL, 0); 2242ab84be7eSDavid Ahern rtnl_register(PF_UNSPEC, RTM_DELNEXTHOP, rtm_del_nexthop, NULL, 0); 2243ab84be7eSDavid Ahern rtnl_register(PF_UNSPEC, RTM_GETNEXTHOP, rtm_get_nexthop, 2244ab84be7eSDavid Ahern rtm_dump_nexthop, 0); 2245ab84be7eSDavid Ahern 2246ab84be7eSDavid Ahern rtnl_register(PF_INET, RTM_NEWNEXTHOP, rtm_new_nexthop, NULL, 0); 2247ab84be7eSDavid Ahern rtnl_register(PF_INET, RTM_GETNEXTHOP, NULL, rtm_dump_nexthop, 0); 2248ab84be7eSDavid Ahern 2249ab84be7eSDavid Ahern rtnl_register(PF_INET6, RTM_NEWNEXTHOP, rtm_new_nexthop, NULL, 0); 2250ab84be7eSDavid Ahern rtnl_register(PF_INET6, RTM_GETNEXTHOP, NULL, rtm_dump_nexthop, 0); 2251ab84be7eSDavid Ahern 2252ab84be7eSDavid Ahern return 0; 2253ab84be7eSDavid Ahern } 2254ab84be7eSDavid Ahern subsys_initcall(nexthop_init); 2255