| // SPDX-License-Identifier: GPL-2.0 |
| /* Generic nexthop implementation |
| * |
| * Copyright (c) 2017-19 Cumulus Networks |
| * Copyright (c) 2017-19 David Ahern <dsa@cumulusnetworks.com> |
| */ |
| |
| #include <linux/nexthop.h> |
| #include <linux/rtnetlink.h> |
| #include <linux/slab.h> |
| #include <net/arp.h> |
| #include <net/ipv6_stubs.h> |
| #include <net/lwtunnel.h> |
| #include <net/ndisc.h> |
| #include <net/nexthop.h> |
| #include <net/route.h> |
| #include <net/sock.h> |
| |
| #define NH_RES_DEFAULT_IDLE_TIMER (120 * HZ) |
| #define NH_RES_DEFAULT_UNBALANCED_TIMER 0 /* No forced rebalancing. */ |
| |
| static void remove_nexthop(struct net *net, struct nexthop *nh, |
| struct nl_info *nlinfo); |
| |
| #define NH_DEV_HASHBITS 8 |
| #define NH_DEV_HASHSIZE (1U << NH_DEV_HASHBITS) |
| |
| static const struct nla_policy rtm_nh_policy_new[] = { |
| [NHA_ID] = { .type = NLA_U32 }, |
| [NHA_GROUP] = { .type = NLA_BINARY }, |
| [NHA_GROUP_TYPE] = { .type = NLA_U16 }, |
| [NHA_BLACKHOLE] = { .type = NLA_FLAG }, |
| [NHA_OIF] = { .type = NLA_U32 }, |
| [NHA_GATEWAY] = { .type = NLA_BINARY }, |
| [NHA_ENCAP_TYPE] = { .type = NLA_U16 }, |
| [NHA_ENCAP] = { .type = NLA_NESTED }, |
| [NHA_FDB] = { .type = NLA_FLAG }, |
| [NHA_RES_GROUP] = { .type = NLA_NESTED }, |
| }; |
| |
| static const struct nla_policy rtm_nh_policy_get[] = { |
| [NHA_ID] = { .type = NLA_U32 }, |
| }; |
| |
| static const struct nla_policy rtm_nh_policy_dump[] = { |
| [NHA_OIF] = { .type = NLA_U32 }, |
| [NHA_GROUPS] = { .type = NLA_FLAG }, |
| [NHA_MASTER] = { .type = NLA_U32 }, |
| [NHA_FDB] = { .type = NLA_FLAG }, |
| }; |
| |
| static const struct nla_policy rtm_nh_res_policy_new[] = { |
| [NHA_RES_GROUP_BUCKETS] = { .type = NLA_U16 }, |
| [NHA_RES_GROUP_IDLE_TIMER] = { .type = NLA_U32 }, |
| [NHA_RES_GROUP_UNBALANCED_TIMER] = { .type = NLA_U32 }, |
| }; |
| |
| static const struct nla_policy rtm_nh_policy_dump_bucket[] = { |
| [NHA_ID] = { .type = NLA_U32 }, |
| [NHA_OIF] = { .type = NLA_U32 }, |
| [NHA_MASTER] = { .type = NLA_U32 }, |
| [NHA_RES_BUCKET] = { .type = NLA_NESTED }, |
| }; |
| |
| static const struct nla_policy rtm_nh_res_bucket_policy_dump[] = { |
| [NHA_RES_BUCKET_NH_ID] = { .type = NLA_U32 }, |
| }; |
| |
| static const struct nla_policy rtm_nh_policy_get_bucket[] = { |
| [NHA_ID] = { .type = NLA_U32 }, |
| [NHA_RES_BUCKET] = { .type = NLA_NESTED }, |
| }; |
| |
| static const struct nla_policy rtm_nh_res_bucket_policy_get[] = { |
| [NHA_RES_BUCKET_INDEX] = { .type = NLA_U16 }, |
| }; |
| |
| static bool nexthop_notifiers_is_empty(struct net *net) |
| { |
| return !net->nexthop.notifier_chain.head; |
| } |
| |
| static void |
| __nh_notifier_single_info_init(struct nh_notifier_single_info *nh_info, |
| const struct nh_info *nhi) |
| { |
| nh_info->dev = nhi->fib_nhc.nhc_dev; |
| nh_info->gw_family = nhi->fib_nhc.nhc_gw_family; |
| if (nh_info->gw_family == AF_INET) |
| nh_info->ipv4 = nhi->fib_nhc.nhc_gw.ipv4; |
| else if (nh_info->gw_family == AF_INET6) |
| nh_info->ipv6 = nhi->fib_nhc.nhc_gw.ipv6; |
| |
| nh_info->is_reject = nhi->reject_nh; |
| nh_info->is_fdb = nhi->fdb_nh; |
| nh_info->has_encap = !!nhi->fib_nhc.nhc_lwtstate; |
| } |
| |
| static int nh_notifier_single_info_init(struct nh_notifier_info *info, |
| const struct nexthop *nh) |
| { |
| struct nh_info *nhi = rtnl_dereference(nh->nh_info); |
| |
| info->type = NH_NOTIFIER_INFO_TYPE_SINGLE; |
| info->nh = kzalloc(sizeof(*info->nh), GFP_KERNEL); |
| if (!info->nh) |
| return -ENOMEM; |
| |
| __nh_notifier_single_info_init(info->nh, nhi); |
| |
| return 0; |
| } |
| |
| static void nh_notifier_single_info_fini(struct nh_notifier_info *info) |
| { |
| kfree(info->nh); |
| } |
| |
| static int nh_notifier_mpath_info_init(struct nh_notifier_info *info, |
| struct nh_group *nhg) |
| { |
| u16 num_nh = nhg->num_nh; |
| int i; |
| |
| info->type = NH_NOTIFIER_INFO_TYPE_GRP; |
| info->nh_grp = kzalloc(struct_size(info->nh_grp, nh_entries, num_nh), |
| GFP_KERNEL); |
| if (!info->nh_grp) |
| return -ENOMEM; |
| |
| info->nh_grp->num_nh = num_nh; |
| info->nh_grp->is_fdb = nhg->fdb_nh; |
| |
| for (i = 0; i < num_nh; i++) { |
| struct nh_grp_entry *nhge = &nhg->nh_entries[i]; |
| struct nh_info *nhi; |
| |
| nhi = rtnl_dereference(nhge->nh->nh_info); |
| info->nh_grp->nh_entries[i].id = nhge->nh->id; |
| info->nh_grp->nh_entries[i].weight = nhge->weight; |
| __nh_notifier_single_info_init(&info->nh_grp->nh_entries[i].nh, |
| nhi); |
| } |
| |
| return 0; |
| } |
| |
| static int nh_notifier_res_table_info_init(struct nh_notifier_info *info, |
| struct nh_group *nhg) |
| { |
| struct nh_res_table *res_table = rtnl_dereference(nhg->res_table); |
| u16 num_nh_buckets = res_table->num_nh_buckets; |
| unsigned long size; |
| u16 i; |
| |
| info->type = NH_NOTIFIER_INFO_TYPE_RES_TABLE; |
| size = struct_size(info->nh_res_table, nhs, num_nh_buckets); |
| info->nh_res_table = __vmalloc(size, GFP_KERNEL | __GFP_ZERO | |
| __GFP_NOWARN); |
| if (!info->nh_res_table) |
| return -ENOMEM; |
| |
| info->nh_res_table->num_nh_buckets = num_nh_buckets; |
| |
| for (i = 0; i < num_nh_buckets; i++) { |
| struct nh_res_bucket *bucket = &res_table->nh_buckets[i]; |
| struct nh_grp_entry *nhge; |
| struct nh_info *nhi; |
| |
| nhge = rtnl_dereference(bucket->nh_entry); |
| nhi = rtnl_dereference(nhge->nh->nh_info); |
| __nh_notifier_single_info_init(&info->nh_res_table->nhs[i], |
| nhi); |
| } |
| |
| return 0; |
| } |
| |
| static int nh_notifier_grp_info_init(struct nh_notifier_info *info, |
| const struct nexthop *nh) |
| { |
| struct nh_group *nhg = rtnl_dereference(nh->nh_grp); |
| |
| if (nhg->hash_threshold) |
| return nh_notifier_mpath_info_init(info, nhg); |
| else if (nhg->resilient) |
| return nh_notifier_res_table_info_init(info, nhg); |
| return -EINVAL; |
| } |
| |
| static void nh_notifier_grp_info_fini(struct nh_notifier_info *info, |
| const struct nexthop *nh) |
| { |
| struct nh_group *nhg = rtnl_dereference(nh->nh_grp); |
| |
| if (nhg->hash_threshold) |
| kfree(info->nh_grp); |
| else if (nhg->resilient) |
| vfree(info->nh_res_table); |
| } |
| |
| static int nh_notifier_info_init(struct nh_notifier_info *info, |
| const struct nexthop *nh) |
| { |
| info->id = nh->id; |
| |
| if (nh->is_group) |
| return nh_notifier_grp_info_init(info, nh); |
| else |
| return nh_notifier_single_info_init(info, nh); |
| } |
| |
| static void nh_notifier_info_fini(struct nh_notifier_info *info, |
| const struct nexthop *nh) |
| { |
| if (nh->is_group) |
| nh_notifier_grp_info_fini(info, nh); |
| else |
| nh_notifier_single_info_fini(info); |
| } |
| |
| static int call_nexthop_notifiers(struct net *net, |
| enum nexthop_event_type event_type, |
| struct nexthop *nh, |
| struct netlink_ext_ack *extack) |
| { |
| struct nh_notifier_info info = { |
| .net = net, |
| .extack = extack, |
| }; |
| int err; |
| |
| ASSERT_RTNL(); |
| |
| if (nexthop_notifiers_is_empty(net)) |
| return 0; |
| |
| err = nh_notifier_info_init(&info, nh); |
| if (err) { |
| NL_SET_ERR_MSG(extack, "Failed to initialize nexthop notifier info"); |
| return err; |
| } |
| |
| err = blocking_notifier_call_chain(&net->nexthop.notifier_chain, |
| event_type, &info); |
| nh_notifier_info_fini(&info, nh); |
| |
| return notifier_to_errno(err); |
| } |
| |
| static int |
| nh_notifier_res_bucket_idle_timer_get(const struct nh_notifier_info *info, |
| bool force, unsigned int *p_idle_timer_ms) |
| { |
| struct nh_res_table *res_table; |
| struct nh_group *nhg; |
| struct nexthop *nh; |
| int err = 0; |
| |
| /* When 'force' is false, nexthop bucket replacement is performed |
| * because the bucket was deemed to be idle. In this case, capable |
| * listeners can choose to perform an atomic replacement: The bucket is |
| * only replaced if it is inactive. However, if the idle timer interval |
| * is smaller than the interval in which a listener is querying |
| * buckets' activity from the device, then atomic replacement should |
| * not be tried. Pass the idle timer value to listeners, so that they |
| * could determine which type of replacement to perform. |
| */ |
| if (force) { |
| *p_idle_timer_ms = 0; |
| return 0; |
| } |
| |
| rcu_read_lock(); |
| |
| nh = nexthop_find_by_id(info->net, info->id); |
| if (!nh) { |
| err = -EINVAL; |
| goto out; |
| } |
| |
| nhg = rcu_dereference(nh->nh_grp); |
| res_table = rcu_dereference(nhg->res_table); |
| *p_idle_timer_ms = jiffies_to_msecs(res_table->idle_timer); |
| |
| out: |
| rcu_read_unlock(); |
| |
| return err; |
| } |
| |
| static int nh_notifier_res_bucket_info_init(struct nh_notifier_info *info, |
| u16 bucket_index, bool force, |
| struct nh_info *oldi, |
| struct nh_info *newi) |
| { |
| unsigned int idle_timer_ms; |
| int err; |
| |
| err = nh_notifier_res_bucket_idle_timer_get(info, force, |
| &idle_timer_ms); |
| if (err) |
| return err; |
| |
| info->type = NH_NOTIFIER_INFO_TYPE_RES_BUCKET; |
| info->nh_res_bucket = kzalloc(sizeof(*info->nh_res_bucket), |
| GFP_KERNEL); |
| if (!info->nh_res_bucket) |
| return -ENOMEM; |
| |
| info->nh_res_bucket->bucket_index = bucket_index; |
| info->nh_res_bucket->idle_timer_ms = idle_timer_ms; |
| info->nh_res_bucket->force = force; |
| __nh_notifier_single_info_init(&info->nh_res_bucket->old_nh, oldi); |
| __nh_notifier_single_info_init(&info->nh_res_bucket->new_nh, newi); |
| return 0; |
| } |
| |
| static void nh_notifier_res_bucket_info_fini(struct nh_notifier_info *info) |
| { |
| kfree(info->nh_res_bucket); |
| } |
| |
| static int __call_nexthop_res_bucket_notifiers(struct net *net, u32 nhg_id, |
| u16 bucket_index, bool force, |
| struct nh_info *oldi, |
| struct nh_info *newi, |
| struct netlink_ext_ack *extack) |
| { |
| struct nh_notifier_info info = { |
| .net = net, |
| .extack = extack, |
| .id = nhg_id, |
| }; |
| int err; |
| |
| if (nexthop_notifiers_is_empty(net)) |
| return 0; |
| |
| err = nh_notifier_res_bucket_info_init(&info, bucket_index, force, |
| oldi, newi); |
| if (err) |
| return err; |
| |
| err = blocking_notifier_call_chain(&net->nexthop.notifier_chain, |
| NEXTHOP_EVENT_BUCKET_REPLACE, &info); |
| nh_notifier_res_bucket_info_fini(&info); |
| |
| return notifier_to_errno(err); |
| } |
| |
| /* There are three users of RES_TABLE, and NHs etc. referenced from there: |
| * |
| * 1) a collection of callbacks for NH maintenance. This operates under |
| * RTNL, |
| * 2) the delayed work that gradually balances the resilient table, |
| * 3) and nexthop_select_path(), operating under RCU. |
| * |
| * Both the delayed work and the RTNL block are writers, and need to |
| * maintain mutual exclusion. Since there are only two and well-known |
| * writers for each table, the RTNL code can make sure it has exclusive |
| * access thus: |
| * |
| * - Have the DW operate without locking; |
| * - synchronously cancel the DW; |
| * - do the writing; |
| * - if the write was not actually a delete, call upkeep, which schedules |
| * DW again if necessary. |
| * |
| * The functions that are always called from the RTNL context use |
| * rtnl_dereference(). The functions that can also be called from the DW do |
| * a raw dereference and rely on the above mutual exclusion scheme. |
| */ |
| #define nh_res_dereference(p) (rcu_dereference_raw(p)) |
| |
| static int call_nexthop_res_bucket_notifiers(struct net *net, u32 nhg_id, |
| u16 bucket_index, bool force, |
| struct nexthop *old_nh, |
| struct nexthop *new_nh, |
| struct netlink_ext_ack *extack) |
| { |
| struct nh_info *oldi = nh_res_dereference(old_nh->nh_info); |
| struct nh_info *newi = nh_res_dereference(new_nh->nh_info); |
| |
| return __call_nexthop_res_bucket_notifiers(net, nhg_id, bucket_index, |
| force, oldi, newi, extack); |
| } |
| |
| static int call_nexthop_res_table_notifiers(struct net *net, struct nexthop *nh, |
| struct netlink_ext_ack *extack) |
| { |
| struct nh_notifier_info info = { |
| .net = net, |
| .extack = extack, |
| }; |
| struct nh_group *nhg; |
| int err; |
| |
| ASSERT_RTNL(); |
| |
| if (nexthop_notifiers_is_empty(net)) |
| return 0; |
| |
| /* At this point, the nexthop buckets are still not populated. Only |
| * emit a notification with the logical nexthops, so that a listener |
| * could potentially veto it in case of unsupported configuration. |
| */ |
| nhg = rtnl_dereference(nh->nh_grp); |
| err = nh_notifier_mpath_info_init(&info, nhg); |
| if (err) { |
| NL_SET_ERR_MSG(extack, "Failed to initialize nexthop notifier info"); |
| return err; |
| } |
| |
| err = blocking_notifier_call_chain(&net->nexthop.notifier_chain, |
| NEXTHOP_EVENT_RES_TABLE_PRE_REPLACE, |
| &info); |
| kfree(info.nh_grp); |
| |
| return notifier_to_errno(err); |
| } |
| |
| static int call_nexthop_notifier(struct notifier_block *nb, struct net *net, |
| enum nexthop_event_type event_type, |
| struct nexthop *nh, |
| struct netlink_ext_ack *extack) |
| { |
| struct nh_notifier_info info = { |
| .net = net, |
| .extack = extack, |
| }; |
| int err; |
| |
| err = nh_notifier_info_init(&info, nh); |
| if (err) |
| return err; |
| |
| err = nb->notifier_call(nb, event_type, &info); |
| nh_notifier_info_fini(&info, nh); |
| |
| return notifier_to_errno(err); |
| } |
| |
| static unsigned int nh_dev_hashfn(unsigned int val) |
| { |
| unsigned int mask = NH_DEV_HASHSIZE - 1; |
| |
| return (val ^ |
| (val >> NH_DEV_HASHBITS) ^ |
| (val >> (NH_DEV_HASHBITS * 2))) & mask; |
| } |
| |
| static void nexthop_devhash_add(struct net *net, struct nh_info *nhi) |
| { |
| struct net_device *dev = nhi->fib_nhc.nhc_dev; |
| struct hlist_head *head; |
| unsigned int hash; |
| |
| WARN_ON(!dev); |
| |
| hash = nh_dev_hashfn(dev->ifindex); |
| head = &net->nexthop.devhash[hash]; |
| hlist_add_head(&nhi->dev_hash, head); |
| } |
| |
| static void nexthop_free_group(struct nexthop *nh) |
| { |
| struct nh_group *nhg; |
| int i; |
| |
| nhg = rcu_dereference_raw(nh->nh_grp); |
| for (i = 0; i < nhg->num_nh; ++i) { |
| struct nh_grp_entry *nhge = &nhg->nh_entries[i]; |
| |
| WARN_ON(!list_empty(&nhge->nh_list)); |
| nexthop_put(nhge->nh); |
| } |
| |
| WARN_ON(nhg->spare == nhg); |
| |
| if (nhg->resilient) |
| vfree(rcu_dereference_raw(nhg->res_table)); |
| |
| kfree(nhg->spare); |
| kfree(nhg); |
| } |
| |
| static void nexthop_free_single(struct nexthop *nh) |
| { |
| struct nh_info *nhi; |
| |
| nhi = rcu_dereference_raw(nh->nh_info); |
| switch (nhi->family) { |
| case AF_INET: |
| fib_nh_release(nh->net, &nhi->fib_nh); |
| break; |
| case AF_INET6: |
| ipv6_stub->fib6_nh_release(&nhi->fib6_nh); |
| break; |
| } |
| kfree(nhi); |
| } |
| |
| void nexthop_free_rcu(struct rcu_head *head) |
| { |
| struct nexthop *nh = container_of(head, struct nexthop, rcu); |
| |
| if (nh->is_group) |
| nexthop_free_group(nh); |
| else |
| nexthop_free_single(nh); |
| |
| kfree(nh); |
| } |
| EXPORT_SYMBOL_GPL(nexthop_free_rcu); |
| |
| static struct nexthop *nexthop_alloc(void) |
| { |
| struct nexthop *nh; |
| |
| nh = kzalloc(sizeof(struct nexthop), GFP_KERNEL); |
| if (nh) { |
| INIT_LIST_HEAD(&nh->fi_list); |
| INIT_LIST_HEAD(&nh->f6i_list); |
| INIT_LIST_HEAD(&nh->grp_list); |
| INIT_LIST_HEAD(&nh->fdb_list); |
| } |
| return nh; |
| } |
| |
| static struct nh_group *nexthop_grp_alloc(u16 num_nh) |
| { |
| struct nh_group *nhg; |
| |
| nhg = kzalloc(struct_size(nhg, nh_entries, num_nh), GFP_KERNEL); |
| if (nhg) |
| nhg->num_nh = num_nh; |
| |
| return nhg; |
| } |
| |
| static void nh_res_table_upkeep_dw(struct work_struct *work); |
| |
| static struct nh_res_table * |
| nexthop_res_table_alloc(struct net *net, u32 nhg_id, struct nh_config *cfg) |
| { |
| const u16 num_nh_buckets = cfg->nh_grp_res_num_buckets; |
| struct nh_res_table *res_table; |
| unsigned long size; |
| |
| size = struct_size(res_table, nh_buckets, num_nh_buckets); |
| res_table = __vmalloc(size, GFP_KERNEL | __GFP_ZERO | __GFP_NOWARN); |
| if (!res_table) |
| return NULL; |
| |
| res_table->net = net; |
| res_table->nhg_id = nhg_id; |
| INIT_DELAYED_WORK(&res_table->upkeep_dw, &nh_res_table_upkeep_dw); |
| INIT_LIST_HEAD(&res_table->uw_nh_entries); |
| res_table->idle_timer = cfg->nh_grp_res_idle_timer; |
| res_table->unbalanced_timer = cfg->nh_grp_res_unbalanced_timer; |
| res_table->num_nh_buckets = num_nh_buckets; |
| return res_table; |
| } |
| |
| static void nh_base_seq_inc(struct net *net) |
| { |
| while (++net->nexthop.seq == 0) |
| ; |
| } |
| |
| /* no reference taken; rcu lock or rtnl must be held */ |
| struct nexthop *nexthop_find_by_id(struct net *net, u32 id) |
| { |
| struct rb_node **pp, *parent = NULL, *next; |
| |
| pp = &net->nexthop.rb_root.rb_node; |
| while (1) { |
| struct nexthop *nh; |
| |
| next = rcu_dereference_raw(*pp); |
| if (!next) |
| break; |
| parent = next; |
| |
| nh = rb_entry(parent, struct nexthop, rb_node); |
| if (id < nh->id) |
| pp = &next->rb_left; |
| else if (id > nh->id) |
| pp = &next->rb_right; |
| else |
| return nh; |
| } |
| return NULL; |
| } |
| EXPORT_SYMBOL_GPL(nexthop_find_by_id); |
| |
| /* used for auto id allocation; called with rtnl held */ |
| static u32 nh_find_unused_id(struct net *net) |
| { |
| u32 id_start = net->nexthop.last_id_allocated; |
| |
| while (1) { |
| net->nexthop.last_id_allocated++; |
| if (net->nexthop.last_id_allocated == id_start) |
| break; |
| |
| if (!nexthop_find_by_id(net, net->nexthop.last_id_allocated)) |
| return net->nexthop.last_id_allocated; |
| } |
| return 0; |
| } |
| |
| static void nh_res_time_set_deadline(unsigned long next_time, |
| unsigned long *deadline) |
| { |
| if (time_before(next_time, *deadline)) |
| *deadline = next_time; |
| } |
| |
| static clock_t nh_res_table_unbalanced_time(struct nh_res_table *res_table) |
| { |
| if (list_empty(&res_table->uw_nh_entries)) |
| return 0; |
| return jiffies_delta_to_clock_t(jiffies - res_table->unbalanced_since); |
| } |
| |
| static int nla_put_nh_group_res(struct sk_buff *skb, struct nh_group *nhg) |
| { |
| struct nh_res_table *res_table = rtnl_dereference(nhg->res_table); |
| struct nlattr *nest; |
| |
| nest = nla_nest_start(skb, NHA_RES_GROUP); |
| if (!nest) |
| return -EMSGSIZE; |
| |
| if (nla_put_u16(skb, NHA_RES_GROUP_BUCKETS, |
| res_table->num_nh_buckets) || |
| nla_put_u32(skb, NHA_RES_GROUP_IDLE_TIMER, |
| jiffies_to_clock_t(res_table->idle_timer)) || |
| nla_put_u32(skb, NHA_RES_GROUP_UNBALANCED_TIMER, |
| jiffies_to_clock_t(res_table->unbalanced_timer)) || |
| nla_put_u64_64bit(skb, NHA_RES_GROUP_UNBALANCED_TIME, |
| nh_res_table_unbalanced_time(res_table), |
| NHA_RES_GROUP_PAD)) |
| goto nla_put_failure; |
| |
| nla_nest_end(skb, nest); |
| return 0; |
| |
| nla_put_failure: |
| nla_nest_cancel(skb, nest); |
| return -EMSGSIZE; |
| } |
| |
| static int nla_put_nh_group(struct sk_buff *skb, struct nh_group *nhg) |
| { |
| struct nexthop_grp *p; |
| size_t len = nhg->num_nh * sizeof(*p); |
| struct nlattr *nla; |
| u16 group_type = 0; |
| int i; |
| |
| if (nhg->hash_threshold) |
| group_type = NEXTHOP_GRP_TYPE_MPATH; |
| else if (nhg->resilient) |
| group_type = NEXTHOP_GRP_TYPE_RES; |
| |
| if (nla_put_u16(skb, NHA_GROUP_TYPE, group_type)) |
| goto nla_put_failure; |
| |
| nla = nla_reserve(skb, NHA_GROUP, len); |
| if (!nla) |
| goto nla_put_failure; |
| |
| p = nla_data(nla); |
| for (i = 0; i < nhg->num_nh; ++i) { |
| p->id = nhg->nh_entries[i].nh->id; |
| p->weight = nhg->nh_entries[i].weight - 1; |
| p += 1; |
| } |
| |
| if (nhg->resilient && nla_put_nh_group_res(skb, nhg)) |
| goto nla_put_failure; |
| |
| return 0; |
| |
| nla_put_failure: |
| return -EMSGSIZE; |
| } |
| |
| static int nh_fill_node(struct sk_buff *skb, struct nexthop *nh, |
| int event, u32 portid, u32 seq, unsigned int nlflags) |
| { |
| struct fib6_nh *fib6_nh; |
| struct fib_nh *fib_nh; |
| struct nlmsghdr *nlh; |
| struct nh_info *nhi; |
| struct nhmsg *nhm; |
| |
| nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nhm), nlflags); |
| if (!nlh) |
| return -EMSGSIZE; |
| |
| nhm = nlmsg_data(nlh); |
| nhm->nh_family = AF_UNSPEC; |
| nhm->nh_flags = nh->nh_flags; |
| nhm->nh_protocol = nh->protocol; |
| nhm->nh_scope = 0; |
| nhm->resvd = 0; |
| |
| if (nla_put_u32(skb, NHA_ID, nh->id)) |
| goto nla_put_failure; |
| |
| if (nh->is_group) { |
| struct nh_group *nhg = rtnl_dereference(nh->nh_grp); |
| |
| if (nhg->fdb_nh && nla_put_flag(skb, NHA_FDB)) |
| goto nla_put_failure; |
| if (nla_put_nh_group(skb, nhg)) |
| goto nla_put_failure; |
| goto out; |
| } |
| |
| nhi = rtnl_dereference(nh->nh_info); |
| nhm->nh_family = nhi->family; |
| if (nhi->reject_nh) { |
| if (nla_put_flag(skb, NHA_BLACKHOLE)) |
| goto nla_put_failure; |
| goto out; |
| } else if (nhi->fdb_nh) { |
| if (nla_put_flag(skb, NHA_FDB)) |
| goto nla_put_failure; |
| } else { |
| const struct net_device *dev; |
| |
| dev = nhi->fib_nhc.nhc_dev; |
| if (dev && nla_put_u32(skb, NHA_OIF, dev->ifindex)) |
| goto nla_put_failure; |
| } |
| |
| nhm->nh_scope = nhi->fib_nhc.nhc_scope; |
| switch (nhi->family) { |
| case AF_INET: |
| fib_nh = &nhi->fib_nh; |
| if (fib_nh->fib_nh_gw_family && |
| nla_put_be32(skb, NHA_GATEWAY, fib_nh->fib_nh_gw4)) |
| goto nla_put_failure; |
| break; |
| |
| case AF_INET6: |
| fib6_nh = &nhi->fib6_nh; |
| if (fib6_nh->fib_nh_gw_family && |
| nla_put_in6_addr(skb, NHA_GATEWAY, &fib6_nh->fib_nh_gw6)) |
| goto nla_put_failure; |
| break; |
| } |
| |
| if (nhi->fib_nhc.nhc_lwtstate && |
| lwtunnel_fill_encap(skb, nhi->fib_nhc.nhc_lwtstate, |
| NHA_ENCAP, NHA_ENCAP_TYPE) < 0) |
| goto nla_put_failure; |
| |
| out: |
| nlmsg_end(skb, nlh); |
| return 0; |
| |
| nla_put_failure: |
| nlmsg_cancel(skb, nlh); |
| return -EMSGSIZE; |
| } |
| |
| static size_t nh_nlmsg_size_grp_res(struct nh_group *nhg) |
| { |
| return nla_total_size(0) + /* NHA_RES_GROUP */ |
| nla_total_size(2) + /* NHA_RES_GROUP_BUCKETS */ |
| nla_total_size(4) + /* NHA_RES_GROUP_IDLE_TIMER */ |
| nla_total_size(4) + /* NHA_RES_GROUP_UNBALANCED_TIMER */ |
| nla_total_size_64bit(8);/* NHA_RES_GROUP_UNBALANCED_TIME */ |
| } |
| |
| static size_t nh_nlmsg_size_grp(struct nexthop *nh) |
| { |
| struct nh_group *nhg = rtnl_dereference(nh->nh_grp); |
| size_t sz = sizeof(struct nexthop_grp) * nhg->num_nh; |
| size_t tot = nla_total_size(sz) + |
| nla_total_size(2); /* NHA_GROUP_TYPE */ |
| |
| if (nhg->resilient) |
| tot += nh_nlmsg_size_grp_res(nhg); |
| |
| return tot; |
| } |
| |
| static size_t nh_nlmsg_size_single(struct nexthop *nh) |
| { |
| struct nh_info *nhi = rtnl_dereference(nh->nh_info); |
| size_t sz; |
| |
| /* covers NHA_BLACKHOLE since NHA_OIF and BLACKHOLE |
| * are mutually exclusive |
| */ |
| sz = nla_total_size(4); /* NHA_OIF */ |
| |
| switch (nhi->family) { |
| case AF_INET: |
| if (nhi->fib_nh.fib_nh_gw_family) |
| sz += nla_total_size(4); /* NHA_GATEWAY */ |
| break; |
| |
| case AF_INET6: |
| /* NHA_GATEWAY */ |
| if (nhi->fib6_nh.fib_nh_gw_family) |
| sz += nla_total_size(sizeof(const struct in6_addr)); |
| break; |
| } |
| |
| if (nhi->fib_nhc.nhc_lwtstate) { |
| sz += lwtunnel_get_encap_size(nhi->fib_nhc.nhc_lwtstate); |
| sz += nla_total_size(2); /* NHA_ENCAP_TYPE */ |
| } |
| |
| return sz; |
| } |
| |
| static size_t nh_nlmsg_size(struct nexthop *nh) |
| { |
| size_t sz = NLMSG_ALIGN(sizeof(struct nhmsg)); |
| |
| sz += nla_total_size(4); /* NHA_ID */ |
| |
| if (nh->is_group) |
| sz += nh_nlmsg_size_grp(nh); |
| else |
| sz += nh_nlmsg_size_single(nh); |
| |
| return sz; |
| } |
| |
| static void nexthop_notify(int event, struct nexthop *nh, struct nl_info *info) |
| { |
| unsigned int nlflags = info->nlh ? info->nlh->nlmsg_flags : 0; |
| u32 seq = info->nlh ? info->nlh->nlmsg_seq : 0; |
| struct sk_buff *skb; |
| int err = -ENOBUFS; |
| |
| skb = nlmsg_new(nh_nlmsg_size(nh), gfp_any()); |
| if (!skb) |
| goto errout; |
| |
| err = nh_fill_node(skb, nh, event, info->portid, seq, nlflags); |
| if (err < 0) { |
| /* -EMSGSIZE implies BUG in nh_nlmsg_size() */ |
| WARN_ON(err == -EMSGSIZE); |
| kfree_skb(skb); |
| goto errout; |
| } |
| |
| rtnl_notify(skb, info->nl_net, info->portid, RTNLGRP_NEXTHOP, |
| info->nlh, gfp_any()); |
| return; |
| errout: |
| if (err < 0) |
| rtnl_set_sk_err(info->nl_net, RTNLGRP_NEXTHOP, err); |
| } |
| |
| static unsigned long nh_res_bucket_used_time(const struct nh_res_bucket *bucket) |
| { |
| return (unsigned long)atomic_long_read(&bucket->used_time); |
| } |
| |
| static unsigned long |
| nh_res_bucket_idle_point(const struct nh_res_table *res_table, |
| const struct nh_res_bucket *bucket, |
| unsigned long now) |
| { |
| unsigned long time = nh_res_bucket_used_time(bucket); |
| |
| /* Bucket was not used since it was migrated. The idle time is now. */ |
| if (time == bucket->migrated_time) |
| return now; |
| |
| return time + res_table->idle_timer; |
| } |
| |
| static unsigned long |
| nh_res_table_unb_point(const struct nh_res_table *res_table) |
| { |
| return res_table->unbalanced_since + res_table->unbalanced_timer; |
| } |
| |
| static void nh_res_bucket_set_idle(const struct nh_res_table *res_table, |
| struct nh_res_bucket *bucket) |
| { |
| unsigned long now = jiffies; |
| |
| atomic_long_set(&bucket->used_time, (long)now); |
| bucket->migrated_time = now; |
| } |
| |
| static void nh_res_bucket_set_busy(struct nh_res_bucket *bucket) |
| { |
| atomic_long_set(&bucket->used_time, (long)jiffies); |
| } |
| |
| static clock_t nh_res_bucket_idle_time(const struct nh_res_bucket *bucket) |
| { |
| unsigned long used_time = nh_res_bucket_used_time(bucket); |
| |
| return jiffies_delta_to_clock_t(jiffies - used_time); |
| } |
| |
| static int nh_fill_res_bucket(struct sk_buff *skb, struct nexthop *nh, |
| struct nh_res_bucket *bucket, u16 bucket_index, |
| int event, u32 portid, u32 seq, |
| unsigned int nlflags, |
| struct netlink_ext_ack *extack) |
| { |
| struct nh_grp_entry *nhge = nh_res_dereference(bucket->nh_entry); |
| struct nlmsghdr *nlh; |
| struct nlattr *nest; |
| struct nhmsg *nhm; |
| |
| nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nhm), nlflags); |
| if (!nlh) |
| return -EMSGSIZE; |
| |
| nhm = nlmsg_data(nlh); |
| nhm->nh_family = AF_UNSPEC; |
| nhm->nh_flags = bucket->nh_flags; |
| nhm->nh_protocol = nh->protocol; |
| nhm->nh_scope = 0; |
| nhm->resvd = 0; |
| |
| if (nla_put_u32(skb, NHA_ID, nh->id)) |
| goto nla_put_failure; |
| |
| nest = nla_nest_start(skb, NHA_RES_BUCKET); |
| if (!nest) |
| goto nla_put_failure; |
| |
| if (nla_put_u16(skb, NHA_RES_BUCKET_INDEX, bucket_index) || |
| nla_put_u32(skb, NHA_RES_BUCKET_NH_ID, nhge->nh->id) || |
| nla_put_u64_64bit(skb, NHA_RES_BUCKET_IDLE_TIME, |
| nh_res_bucket_idle_time(bucket), |
| NHA_RES_BUCKET_PAD)) |
| goto nla_put_failure_nest; |
| |
| nla_nest_end(skb, nest); |
| nlmsg_end(skb, nlh); |
| return 0; |
| |
| nla_put_failure_nest: |
| nla_nest_cancel(skb, nest); |
| nla_put_failure: |
| nlmsg_cancel(skb, nlh); |
| return -EMSGSIZE; |
| } |
| |
| static void nexthop_bucket_notify(struct nh_res_table *res_table, |
| u16 bucket_index) |
| { |
| struct nh_res_bucket *bucket = &res_table->nh_buckets[bucket_index]; |
| struct nh_grp_entry *nhge = nh_res_dereference(bucket->nh_entry); |
| struct nexthop *nh = nhge->nh_parent; |
| struct sk_buff *skb; |
| int err = -ENOBUFS; |
| |
| skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
| if (!skb) |
| goto errout; |
| |
| err = nh_fill_res_bucket(skb, nh, bucket, bucket_index, |
| RTM_NEWNEXTHOPBUCKET, 0, 0, NLM_F_REPLACE, |
| NULL); |
| if (err < 0) { |
| kfree_skb(skb); |
| goto errout; |
| } |
| |
| rtnl_notify(skb, nh->net, 0, RTNLGRP_NEXTHOP, NULL, GFP_KERNEL); |
| return; |
| errout: |
| if (err < 0) |
| rtnl_set_sk_err(nh->net, RTNLGRP_NEXTHOP, err); |
| } |
| |
| static bool valid_group_nh(struct nexthop *nh, unsigned int npaths, |
| bool *is_fdb, struct netlink_ext_ack *extack) |
| { |
| if (nh->is_group) { |
| struct nh_group *nhg = rtnl_dereference(nh->nh_grp); |
| |
| /* Nesting groups within groups is not supported. */ |
| if (nhg->hash_threshold) { |
| NL_SET_ERR_MSG(extack, |
| "Hash-threshold group can not be a nexthop within a group"); |
| return false; |
| } |
| if (nhg->resilient) { |
| NL_SET_ERR_MSG(extack, |
| "Resilient group can not be a nexthop within a group"); |
| return false; |
| } |
| *is_fdb = nhg->fdb_nh; |
| } else { |
| struct nh_info *nhi = rtnl_dereference(nh->nh_info); |
| |
| if (nhi->reject_nh && npaths > 1) { |
| NL_SET_ERR_MSG(extack, |
| "Blackhole nexthop can not be used in a group with more than 1 path"); |
| return false; |
| } |
| *is_fdb = nhi->fdb_nh; |
| } |
| |
| return true; |
| } |
| |
| static int nh_check_attr_fdb_group(struct nexthop *nh, u8 *nh_family, |
| struct netlink_ext_ack *extack) |
| { |
| struct nh_info *nhi; |
| |
| nhi = rtnl_dereference(nh->nh_info); |
| |
| if (!nhi->fdb_nh) { |
| NL_SET_ERR_MSG(extack, "FDB nexthop group can only have fdb nexthops"); |
| return -EINVAL; |
| } |
| |
| if (*nh_family == AF_UNSPEC) { |
| *nh_family = nhi->family; |
| } else if (*nh_family != nhi->family) { |
| NL_SET_ERR_MSG(extack, "FDB nexthop group cannot have mixed family nexthops"); |
| return -EINVAL; |
| } |
| |
| return 0; |
| } |
| |
| static int nh_check_attr_group(struct net *net, |
| struct nlattr *tb[], size_t tb_size, |
| u16 nh_grp_type, struct netlink_ext_ack *extack) |
| { |
| unsigned int len = nla_len(tb[NHA_GROUP]); |
| u8 nh_family = AF_UNSPEC; |
| struct nexthop_grp *nhg; |
| unsigned int i, j; |
| u8 nhg_fdb = 0; |
| |
| if (!len || len & (sizeof(struct nexthop_grp) - 1)) { |
| NL_SET_ERR_MSG(extack, |
| "Invalid length for nexthop group attribute"); |
| return -EINVAL; |
| } |
| |
| /* convert len to number of nexthop ids */ |
| len /= sizeof(*nhg); |
| |
| nhg = nla_data(tb[NHA_GROUP]); |
| for (i = 0; i < len; ++i) { |
| if (nhg[i].resvd1 || nhg[i].resvd2) { |
| NL_SET_ERR_MSG(extack, "Reserved fields in nexthop_grp must be 0"); |
| return -EINVAL; |
| } |
| if (nhg[i].weight > 254) { |
| NL_SET_ERR_MSG(extack, "Invalid value for weight"); |
| return -EINVAL; |
| } |
| for (j = i + 1; j < len; ++j) { |
| if (nhg[i].id == nhg[j].id) { |
| NL_SET_ERR_MSG(extack, "Nexthop id can not be used twice in a group"); |
| return -EINVAL; |
| } |
| } |
| } |
| |
| if (tb[NHA_FDB]) |
| nhg_fdb = 1; |
| nhg = nla_data(tb[NHA_GROUP]); |
| for (i = 0; i < len; ++i) { |
| struct nexthop *nh; |
| bool is_fdb_nh; |
| |
| nh = nexthop_find_by_id(net, nhg[i].id); |
| if (!nh) { |
| NL_SET_ERR_MSG(extack, "Invalid nexthop id"); |
| return -EINVAL; |
| } |
| if (!valid_group_nh(nh, len, &is_fdb_nh, extack)) |
| return -EINVAL; |
| |
| if (nhg_fdb && nh_check_attr_fdb_group(nh, &nh_family, extack)) |
| return -EINVAL; |
| |
| if (!nhg_fdb && is_fdb_nh) { |
| NL_SET_ERR_MSG(extack, "Non FDB nexthop group cannot have fdb nexthops"); |
| return -EINVAL; |
| } |
| } |
| for (i = NHA_GROUP_TYPE + 1; i < tb_size; ++i) { |
| if (!tb[i]) |
| continue; |
| switch (i) { |
| case NHA_FDB: |
| continue; |
| case NHA_RES_GROUP: |
| if (nh_grp_type == NEXTHOP_GRP_TYPE_RES) |
| continue; |
| break; |
| } |
| NL_SET_ERR_MSG(extack, |
| "No other attributes can be set in nexthop groups"); |
| return -EINVAL; |
| } |
| |
| return 0; |
| } |
| |
| static bool ipv6_good_nh(const struct fib6_nh *nh) |
| { |
| int state = NUD_REACHABLE; |
| struct neighbour *n; |
| |
| rcu_read_lock_bh(); |
| |
| n = __ipv6_neigh_lookup_noref_stub(nh->fib_nh_dev, &nh->fib_nh_gw6); |
| if (n) |
| state = n->nud_state; |
| |
| rcu_read_unlock_bh(); |
| |
| return !!(state & NUD_VALID); |
| } |
| |
| static bool ipv4_good_nh(const struct fib_nh *nh) |
| { |
| int state = NUD_REACHABLE; |
| struct neighbour *n; |
| |
| rcu_read_lock_bh(); |
| |
| n = __ipv4_neigh_lookup_noref(nh->fib_nh_dev, |
| (__force u32)nh->fib_nh_gw4); |
| if (n) |
| state = n->nud_state; |
| |
| rcu_read_unlock_bh(); |
| |
| return !!(state & NUD_VALID); |
| } |
| |
| static struct nexthop *nexthop_select_path_hthr(struct nh_group *nhg, int hash) |
| { |
| struct nexthop *rc = NULL; |
| int i; |
| |
| for (i = 0; i < nhg->num_nh; ++i) { |
| struct nh_grp_entry *nhge = &nhg->nh_entries[i]; |
| struct nh_info *nhi; |
| |
| if (hash > atomic_read(&nhge->hthr.upper_bound)) |
| continue; |
| |
| nhi = rcu_dereference(nhge->nh->nh_info); |
| if (nhi->fdb_nh) |
| return nhge->nh; |
| |
| /* nexthops always check if it is good and does |
| * not rely on a sysctl for this behavior |
| */ |
| switch (nhi->family) { |
| case AF_INET: |
| if (ipv4_good_nh(&nhi->fib_nh)) |
| return nhge->nh; |
| break; |
| case AF_INET6: |
| if (ipv6_good_nh(&nhi->fib6_nh)) |
| return nhge->nh; |
| break; |
| } |
| |
| if (!rc) |
| rc = nhge->nh; |
| } |
| |
| return rc; |
| } |
| |
| static struct nexthop *nexthop_select_path_res(struct nh_group *nhg, int hash) |
| { |
| struct nh_res_table *res_table = rcu_dereference(nhg->res_table); |
| u16 bucket_index = hash % res_table->num_nh_buckets; |
| struct nh_res_bucket *bucket; |
| struct nh_grp_entry *nhge; |
| |
| /* nexthop_select_path() is expected to return a non-NULL value, so |
| * skip protocol validation and just hand out whatever there is. |
| */ |
| bucket = &res_table->nh_buckets[bucket_index]; |
| nh_res_bucket_set_busy(bucket); |
| nhge = rcu_dereference(bucket->nh_entry); |
| return nhge->nh; |
| } |
| |
| struct nexthop *nexthop_select_path(struct nexthop *nh, int hash) |
| { |
| struct nh_group *nhg; |
| |
| if (!nh->is_group) |
| return nh; |
| |
| nhg = rcu_dereference(nh->nh_grp); |
| if (nhg->hash_threshold) |
| return nexthop_select_path_hthr(nhg, hash); |
| else if (nhg->resilient) |
| return nexthop_select_path_res(nhg, hash); |
| |
| /* Unreachable. */ |
| return NULL; |
| } |
| EXPORT_SYMBOL_GPL(nexthop_select_path); |
| |
| int nexthop_for_each_fib6_nh(struct nexthop *nh, |
| int (*cb)(struct fib6_nh *nh, void *arg), |
| void *arg) |
| { |
| struct nh_info *nhi; |
| int err; |
| |
| if (nh->is_group) { |
| struct nh_group *nhg; |
| int i; |
| |
| nhg = rcu_dereference_rtnl(nh->nh_grp); |
| for (i = 0; i < nhg->num_nh; i++) { |
| struct nh_grp_entry *nhge = &nhg->nh_entries[i]; |
| |
| nhi = rcu_dereference_rtnl(nhge->nh->nh_info); |
| err = cb(&nhi->fib6_nh, arg); |
| if (err) |
| return err; |
| } |
| } else { |
| nhi = rcu_dereference_rtnl(nh->nh_info); |
| err = cb(&nhi->fib6_nh, arg); |
| if (err) |
| return err; |
| } |
| |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(nexthop_for_each_fib6_nh); |
| |
| static int check_src_addr(const struct in6_addr *saddr, |
| struct netlink_ext_ack *extack) |
| { |
| if (!ipv6_addr_any(saddr)) { |
| NL_SET_ERR_MSG(extack, "IPv6 routes using source address can not use nexthop objects"); |
| return -EINVAL; |
| } |
| return 0; |
| } |
| |
| int fib6_check_nexthop(struct nexthop *nh, struct fib6_config *cfg, |
| struct netlink_ext_ack *extack) |
| { |
| struct nh_info *nhi; |
| bool is_fdb_nh; |
| |
| /* fib6_src is unique to a fib6_info and limits the ability to cache |
| * routes in fib6_nh within a nexthop that is potentially shared |
| * across multiple fib entries. If the config wants to use source |
| * routing it can not use nexthop objects. mlxsw also does not allow |
| * fib6_src on routes. |
| */ |
| if (cfg && check_src_addr(&cfg->fc_src, extack) < 0) |
| return -EINVAL; |
| |
| if (nh->is_group) { |
| struct nh_group *nhg; |
| |
| nhg = rtnl_dereference(nh->nh_grp); |
| if (nhg->has_v4) |
| goto no_v4_nh; |
| is_fdb_nh = nhg->fdb_nh; |
| } else { |
| nhi = rtnl_dereference(nh->nh_info); |
| if (nhi->family == AF_INET) |
| goto no_v4_nh; |
| is_fdb_nh = nhi->fdb_nh; |
| } |
| |
| if (is_fdb_nh) { |
| NL_SET_ERR_MSG(extack, "Route cannot point to a fdb nexthop"); |
| return -EINVAL; |
| } |
| |
| return 0; |
| no_v4_nh: |
| NL_SET_ERR_MSG(extack, "IPv6 routes can not use an IPv4 nexthop"); |
| return -EINVAL; |
| } |
| EXPORT_SYMBOL_GPL(fib6_check_nexthop); |
| |
| /* if existing nexthop has ipv6 routes linked to it, need |
| * to verify this new spec works with ipv6 |
| */ |
| static int fib6_check_nh_list(struct nexthop *old, struct nexthop *new, |
| struct netlink_ext_ack *extack) |
| { |
| struct fib6_info *f6i; |
| |
| if (list_empty(&old->f6i_list)) |
| return 0; |
| |
| list_for_each_entry(f6i, &old->f6i_list, nh_list) { |
| if (check_src_addr(&f6i->fib6_src.addr, extack) < 0) |
| return -EINVAL; |
| } |
| |
| return fib6_check_nexthop(new, NULL, extack); |
| } |
| |
| static int nexthop_check_scope(struct nh_info *nhi, u8 scope, |
| struct netlink_ext_ack *extack) |
| { |
| if (scope == RT_SCOPE_HOST && nhi->fib_nhc.nhc_gw_family) { |
| NL_SET_ERR_MSG(extack, |
| "Route with host scope can not have a gateway"); |
| return -EINVAL; |
| } |
| |
| if (nhi->fib_nhc.nhc_flags & RTNH_F_ONLINK && scope >= RT_SCOPE_LINK) { |
| NL_SET_ERR_MSG(extack, "Scope mismatch with nexthop"); |
| return -EINVAL; |
| } |
| |
| return 0; |
| } |
| |
| /* Invoked by fib add code to verify nexthop by id is ok with |
| * config for prefix; parts of fib_check_nh not done when nexthop |
| * object is used. |
| */ |
| int fib_check_nexthop(struct nexthop *nh, u8 scope, |
| struct netlink_ext_ack *extack) |
| { |
| struct nh_info *nhi; |
| int err = 0; |
| |
| if (nh->is_group) { |
| struct nh_group *nhg; |
| |
| nhg = rtnl_dereference(nh->nh_grp); |
| if (nhg->fdb_nh) { |
| NL_SET_ERR_MSG(extack, "Route cannot point to a fdb nexthop"); |
| err = -EINVAL; |
| goto out; |
| } |
| |
| if (scope == RT_SCOPE_HOST) { |
| NL_SET_ERR_MSG(extack, "Route with host scope can not have multiple nexthops"); |
| err = -EINVAL; |
| goto out; |
| } |
| |
| /* all nexthops in a group have the same scope */ |
| nhi = rtnl_dereference(nhg->nh_entries[0].nh->nh_info); |
| err = nexthop_check_scope(nhi, scope, extack); |
| } else { |
| nhi = rtnl_dereference(nh->nh_info); |
| if (nhi->fdb_nh) { |
| NL_SET_ERR_MSG(extack, "Route cannot point to a fdb nexthop"); |
| err = -EINVAL; |
| goto out; |
| } |
| err = nexthop_check_scope(nhi, scope, extack); |
| } |
| |
| out: |
| return err; |
| } |
| |
| static int fib_check_nh_list(struct nexthop *old, struct nexthop *new, |
| struct netlink_ext_ack *extack) |
| { |
| struct fib_info *fi; |
| |
| list_for_each_entry(fi, &old->fi_list, nh_list) { |
| int err; |
| |
| err = fib_check_nexthop(new, fi->fib_scope, extack); |
| if (err) |
| return err; |
| } |
| return 0; |
| } |
| |
| static bool nh_res_nhge_is_balanced(const struct nh_grp_entry *nhge) |
| { |
| return nhge->res.count_buckets == nhge->res.wants_buckets; |
| } |
| |
| static bool nh_res_nhge_is_ow(const struct nh_grp_entry *nhge) |
| { |
| return nhge->res.count_buckets > nhge->res.wants_buckets; |
| } |
| |
| static bool nh_res_nhge_is_uw(const struct nh_grp_entry *nhge) |
| { |
| return nhge->res.count_buckets < nhge->res.wants_buckets; |
| } |
| |
| static bool nh_res_table_is_balanced(const struct nh_res_table *res_table) |
| { |
| return list_empty(&res_table->uw_nh_entries); |
| } |
| |
| static void nh_res_bucket_unset_nh(struct nh_res_bucket *bucket) |
| { |
| struct nh_grp_entry *nhge; |
| |
| if (bucket->occupied) { |
| nhge = nh_res_dereference(bucket->nh_entry); |
| nhge->res.count_buckets--; |
| bucket->occupied = false; |
| } |
| } |
| |
| static void nh_res_bucket_set_nh(struct nh_res_bucket *bucket, |
| struct nh_grp_entry *nhge) |
| { |
| nh_res_bucket_unset_nh(bucket); |
| |
| bucket->occupied = true; |
| rcu_assign_pointer(bucket->nh_entry, nhge); |
| nhge->res.count_buckets++; |
| } |
| |
| static bool nh_res_bucket_should_migrate(struct nh_res_table *res_table, |
| struct nh_res_bucket *bucket, |
| unsigned long *deadline, bool *force) |
| { |
| unsigned long now = jiffies; |
| struct nh_grp_entry *nhge; |
| unsigned long idle_point; |
| |
| if (!bucket->occupied) { |
| /* The bucket is not occupied, its NHGE pointer is either |
| * NULL or obsolete. We _have to_ migrate: set force. |
| */ |
| *force = true; |
| return true; |
| } |
| |
| nhge = nh_res_dereference(bucket->nh_entry); |
| |
| /* If the bucket is populated by an underweight or balanced |
| * nexthop, do not migrate. |
| */ |
| if (!nh_res_nhge_is_ow(nhge)) |
| return false; |
| |
| /* At this point we know that the bucket is populated with an |
| * overweight nexthop. It needs to be migrated to a new nexthop if |
| * the idle timer of unbalanced timer expired. |
| */ |
| |
| idle_point = nh_res_bucket_idle_point(res_table, bucket, now); |
| if (time_after_eq(now, idle_point)) { |
| /* The bucket is idle. We _can_ migrate: unset force. */ |
| *force = false; |
| return true; |
| } |
| |
| /* Unbalanced timer of 0 means "never force". */ |
| if (res_table->unbalanced_timer) { |
| unsigned long unb_point; |
| |
| unb_point = nh_res_table_unb_point(res_table); |
| if (time_after(now, unb_point)) { |
| /* The bucket is not idle, but the unbalanced timer |
| * expired. We _can_ migrate, but set force anyway, |
| * so that drivers know to ignore activity reports |
| * from the HW. |
| */ |
| *force = true; |
| return true; |
| } |
| |
| nh_res_time_set_deadline(unb_point, deadline); |
| } |
| |
| nh_res_time_set_deadline(idle_point, deadline); |
| return false; |
| } |
| |
| static bool nh_res_bucket_migrate(struct nh_res_table *res_table, |
| u16 bucket_index, bool notify, |
| bool notify_nl, bool force) |
| { |
| struct nh_res_bucket *bucket = &res_table->nh_buckets[bucket_index]; |
| struct nh_grp_entry *new_nhge; |
| struct netlink_ext_ack extack; |
| int err; |
| |
| new_nhge = list_first_entry_or_null(&res_table->uw_nh_entries, |
| struct nh_grp_entry, |
| res.uw_nh_entry); |
| if (WARN_ON_ONCE(!new_nhge)) |
| /* If this function is called, "bucket" is either not |
| * occupied, or it belongs to a next hop that is |
| * overweight. In either case, there ought to be a |
| * corresponding underweight next hop. |
| */ |
| return false; |
| |
| if (notify) { |
| struct nh_grp_entry *old_nhge; |
| |
| old_nhge = nh_res_dereference(bucket->nh_entry); |
| err = call_nexthop_res_bucket_notifiers(res_table->net, |
| res_table->nhg_id, |
| bucket_index, force, |
| old_nhge->nh, |
| new_nhge->nh, &extack); |
| if (err) { |
| pr_err_ratelimited("%s\n", extack._msg); |
| if (!force) |
| return false; |
| /* It is not possible to veto a forced replacement, so |
| * just clear the hardware flags from the nexthop |
| * bucket to indicate to user space that this bucket is |
| * not correctly populated in hardware. |
| */ |
| bucket->nh_flags &= ~(RTNH_F_OFFLOAD | RTNH_F_TRAP); |
| } |
| } |
| |
| nh_res_bucket_set_nh(bucket, new_nhge); |
| nh_res_bucket_set_idle(res_table, bucket); |
| |
| if (notify_nl) |
| nexthop_bucket_notify(res_table, bucket_index); |
| |
| if (nh_res_nhge_is_balanced(new_nhge)) |
| list_del(&new_nhge->res.uw_nh_entry); |
| return true; |
| } |
| |
| #define NH_RES_UPKEEP_DW_MINIMUM_INTERVAL (HZ / 2) |
| |
| static void nh_res_table_upkeep(struct nh_res_table *res_table, |
| bool notify, bool notify_nl) |
| { |
| unsigned long now = jiffies; |
| unsigned long deadline; |
| u16 i; |
| |
| /* Deadline is the next time that upkeep should be run. It is the |
| * earliest time at which one of the buckets might be migrated. |
| * Start at the most pessimistic estimate: either unbalanced_timer |
| * from now, or if there is none, idle_timer from now. For each |
| * encountered time point, call nh_res_time_set_deadline() to |
| * refine the estimate. |
| */ |
| if (res_table->unbalanced_timer) |
| deadline = now + res_table->unbalanced_timer; |
| else |
| deadline = now + res_table->idle_timer; |
| |
| for (i = 0; i < res_table->num_nh_buckets; i++) { |
| struct nh_res_bucket *bucket = &res_table->nh_buckets[i]; |
| bool force; |
| |
| if (nh_res_bucket_should_migrate(res_table, bucket, |
| &deadline, &force)) { |
| if (!nh_res_bucket_migrate(res_table, i, notify, |
| notify_nl, force)) { |
| unsigned long idle_point; |
| |
| /* A driver can override the migration |
| * decision if the HW reports that the |
| * bucket is actually not idle. Therefore |
| * remark the bucket as busy again and |
| * update the deadline. |
| */ |
| nh_res_bucket_set_busy(bucket); |
| idle_point = nh_res_bucket_idle_point(res_table, |
| bucket, |
| now); |
| nh_res_time_set_deadline(idle_point, &deadline); |
| } |
| } |
| } |
| |
| /* If the group is still unbalanced, schedule the next upkeep to |
| * either the deadline computed above, or the minimum deadline, |
| * whichever comes later. |
| */ |
| if (!nh_res_table_is_balanced(res_table)) { |
| unsigned long now = jiffies; |
| unsigned long min_deadline; |
| |
| min_deadline = now + NH_RES_UPKEEP_DW_MINIMUM_INTERVAL; |
| if (time_before(deadline, min_deadline)) |
| deadline = min_deadline; |
| |
| queue_delayed_work(system_power_efficient_wq, |
| &res_table->upkeep_dw, deadline - now); |
| } |
| } |
| |
| static void nh_res_table_upkeep_dw(struct work_struct *work) |
| { |
| struct delayed_work *dw = to_delayed_work(work); |
| struct nh_res_table *res_table; |
| |
| res_table = container_of(dw, struct nh_res_table, upkeep_dw); |
| nh_res_table_upkeep(res_table, true, true); |
| } |
| |
| static void nh_res_table_cancel_upkeep(struct nh_res_table *res_table) |
| { |
| cancel_delayed_work_sync(&res_table->upkeep_dw); |
| } |
| |
| static void nh_res_group_rebalance(struct nh_group *nhg, |
| struct nh_res_table *res_table) |
| { |
| int prev_upper_bound = 0; |
| int total = 0; |
| int w = 0; |
| int i; |
| |
| INIT_LIST_HEAD(&res_table->uw_nh_entries); |
| |
| for (i = 0; i < nhg->num_nh; ++i) |
| total += nhg->nh_entries[i].weight; |
| |
| for (i = 0; i < nhg->num_nh; ++i) { |
| struct nh_grp_entry *nhge = &nhg->nh_entries[i]; |
| int upper_bound; |
| |
| w += nhge->weight; |
| upper_bound = DIV_ROUND_CLOSEST(res_table->num_nh_buckets * w, |
| total); |
| nhge->res.wants_buckets = upper_bound - prev_upper_bound; |
| prev_upper_bound = upper_bound; |
| |
| if (nh_res_nhge_is_uw(nhge)) { |
| if (list_empty(&res_table->uw_nh_entries)) |
| res_table->unbalanced_since = jiffies; |
| list_add(&nhge->res.uw_nh_entry, |
| &res_table->uw_nh_entries); |
| } |
| } |
| } |
| |
| /* Migrate buckets in res_table so that they reference NHGE's from NHG with |
| * the right NH ID. Set those buckets that do not have a corresponding NHGE |
| * entry in NHG as not occupied. |
| */ |
| static void nh_res_table_migrate_buckets(struct nh_res_table *res_table, |
| struct nh_group *nhg) |
| { |
| u16 i; |
| |
| for (i = 0; i < res_table->num_nh_buckets; i++) { |
| struct nh_res_bucket *bucket = &res_table->nh_buckets[i]; |
| u32 id = rtnl_dereference(bucket->nh_entry)->nh->id; |
| bool found = false; |
| int j; |
| |
| for (j = 0; j < nhg->num_nh; j++) { |
| struct nh_grp_entry *nhge = &nhg->nh_entries[j]; |
| |
| if (nhge->nh->id == id) { |
| nh_res_bucket_set_nh(bucket, nhge); |
| found = true; |
| break; |
| } |
| } |
| |
| if (!found) |
| nh_res_bucket_unset_nh(bucket); |
| } |
| } |
| |
| static void replace_nexthop_grp_res(struct nh_group *oldg, |
| struct nh_group *newg) |
| { |
| /* For NH group replacement, the new NHG might only have a stub |
| * hash table with 0 buckets, because the number of buckets was not |
| * specified. For NH removal, oldg and newg both reference the same |
| * res_table. So in any case, in the following, we want to work |
| * with oldg->res_table. |
| */ |
| struct nh_res_table *old_res_table = rtnl_dereference(oldg->res_table); |
| unsigned long prev_unbalanced_since = old_res_table->unbalanced_since; |
| bool prev_has_uw = !list_empty(&old_res_table->uw_nh_entries); |
| |
| nh_res_table_cancel_upkeep(old_res_table); |
| nh_res_table_migrate_buckets(old_res_table, newg); |
| nh_res_group_rebalance(newg, old_res_table); |
| if (prev_has_uw && !list_empty(&old_res_table->uw_nh_entries)) |
| old_res_table->unbalanced_since = prev_unbalanced_since; |
| nh_res_table_upkeep(old_res_table, true, false); |
| } |
| |
| static void nh_hthr_group_rebalance(struct nh_group *nhg) |
| { |
| int total = 0; |
| int w = 0; |
| int i; |
| |
| for (i = 0; i < nhg->num_nh; ++i) |
| total += nhg->nh_entries[i].weight; |
| |
| for (i = 0; i < nhg->num_nh; ++i) { |
| struct nh_grp_entry *nhge = &nhg->nh_entries[i]; |
| int upper_bound; |
| |
| w += nhge->weight; |
| upper_bound = DIV_ROUND_CLOSEST_ULL((u64)w << 31, total) - 1; |
| atomic_set(&nhge->hthr.upper_bound, upper_bound); |
| } |
| } |
| |
| static void remove_nh_grp_entry(struct net *net, struct nh_grp_entry *nhge, |
| struct nl_info *nlinfo) |
| { |
| struct nh_grp_entry *nhges, *new_nhges; |
| struct nexthop *nhp = nhge->nh_parent; |
| struct netlink_ext_ack extack; |
| struct nexthop *nh = nhge->nh; |
| struct nh_group *nhg, *newg; |
| int i, j, err; |
| |
| WARN_ON(!nh); |
| |
| nhg = rtnl_dereference(nhp->nh_grp); |
| newg = nhg->spare; |
| |
| /* last entry, keep it visible and remove the parent */ |
| if (nhg->num_nh == 1) { |
| remove_nexthop(net, nhp, nlinfo); |
| return; |
| } |
| |
| newg->has_v4 = false; |
| newg->is_multipath = nhg->is_multipath; |
| newg->hash_threshold = nhg->hash_threshold; |
| newg->resilient = nhg->resilient; |
| newg->fdb_nh = nhg->fdb_nh; |
| newg->num_nh = nhg->num_nh; |
| |
| /* copy old entries to new except the one getting removed */ |
| nhges = nhg->nh_entries; |
| new_nhges = newg->nh_entries; |
| for (i = 0, j = 0; i < nhg->num_nh; ++i) { |
| struct nh_info *nhi; |
| |
| /* current nexthop getting removed */ |
| if (nhg->nh_entries[i].nh == nh) { |
| newg->num_nh--; |
| continue; |
| } |
| |
| nhi = rtnl_dereference(nhges[i].nh->nh_info); |
| if (nhi->family == AF_INET) |
| newg->has_v4 = true; |
| |
| list_del(&nhges[i].nh_list); |
| new_nhges[j].nh_parent = nhges[i].nh_parent; |
| new_nhges[j].nh = nhges[i].nh; |
| new_nhges[j].weight = nhges[i].weight; |
| list_add(&new_nhges[j].nh_list, &new_nhges[j].nh->grp_list); |
| j++; |
| } |
| |
| if (newg->hash_threshold) |
| nh_hthr_group_rebalance(newg); |
| else if (newg->resilient) |
| replace_nexthop_grp_res(nhg, newg); |
| |
| rcu_assign_pointer(nhp->nh_grp, newg); |
| |
| list_del(&nhge->nh_list); |
| nexthop_put(nhge->nh); |
| |
| /* Removal of a NH from a resilient group is notified through |
| * bucket notifications. |
| */ |
| if (newg->hash_threshold) { |
| err = call_nexthop_notifiers(net, NEXTHOP_EVENT_REPLACE, nhp, |
| &extack); |
| if (err) |
| pr_err("%s\n", extack._msg); |
| } |
| |
| if (nlinfo) |
| nexthop_notify(RTM_NEWNEXTHOP, nhp, nlinfo); |
| } |
| |
| static void remove_nexthop_from_groups(struct net *net, struct nexthop *nh, |
| struct nl_info *nlinfo) |
| { |
| struct nh_grp_entry *nhge, *tmp; |
| |
| list_for_each_entry_safe(nhge, tmp, &nh->grp_list, nh_list) |
| remove_nh_grp_entry(net, nhge, nlinfo); |
| |
| /* make sure all see the newly published array before releasing rtnl */ |
| synchronize_net(); |
| } |
| |
| static void remove_nexthop_group(struct nexthop *nh, struct nl_info *nlinfo) |
| { |
| struct nh_group *nhg = rcu_dereference_rtnl(nh->nh_grp); |
| struct nh_res_table *res_table; |
| int i, num_nh = nhg->num_nh; |
| |
| for (i = 0; i < num_nh; ++i) { |
| struct nh_grp_entry *nhge = &nhg->nh_entries[i]; |
| |
| if (WARN_ON(!nhge->nh)) |
| continue; |
| |
| list_del_init(&nhge->nh_list); |
| } |
| |
| if (nhg->resilient) { |
| res_table = rtnl_dereference(nhg->res_table); |
| nh_res_table_cancel_upkeep(res_table); |
| } |
| } |
| |
| /* not called for nexthop replace */ |
| static void __remove_nexthop_fib(struct net *net, struct nexthop *nh) |
| { |
| struct fib6_info *f6i, *tmp; |
| bool do_flush = false; |
| struct fib_info *fi; |
| |
| list_for_each_entry(fi, &nh->fi_list, nh_list) { |
| fi->fib_flags |= RTNH_F_DEAD; |
| do_flush = true; |
| } |
| if (do_flush) |
| fib_flush(net); |
| |
| /* ip6_del_rt removes the entry from this list hence the _safe */ |
| list_for_each_entry_safe(f6i, tmp, &nh->f6i_list, nh_list) { |
| /* __ip6_del_rt does a release, so do a hold here */ |
| fib6_info_hold(f6i); |
| ipv6_stub->ip6_del_rt(net, f6i, |
| !net->ipv4.sysctl_nexthop_compat_mode); |
| } |
| } |
| |
| static void __remove_nexthop(struct net *net, struct nexthop *nh, |
| struct nl_info *nlinfo) |
| { |
| __remove_nexthop_fib(net, nh); |
| |
| if (nh->is_group) { |
| remove_nexthop_group(nh, nlinfo); |
| } else { |
| struct nh_info *nhi; |
| |
| nhi = rtnl_dereference(nh->nh_info); |
| if (nhi->fib_nhc.nhc_dev) |
| hlist_del(&nhi->dev_hash); |
| |
| remove_nexthop_from_groups(net, nh, nlinfo); |
| } |
| } |
| |
| static void remove_nexthop(struct net *net, struct nexthop *nh, |
| struct nl_info *nlinfo) |
| { |
| call_nexthop_notifiers(net, NEXTHOP_EVENT_DEL, nh, NULL); |
| |
| /* remove from the tree */ |
| rb_erase(&nh->rb_node, &net->nexthop.rb_root); |
| |
| if (nlinfo) |
| nexthop_notify(RTM_DELNEXTHOP, nh, nlinfo); |
| |
| __remove_nexthop(net, nh, nlinfo); |
| nh_base_seq_inc(net); |
| |
| nexthop_put(nh); |
| } |
| |
| /* if any FIB entries reference this nexthop, any dst entries |
| * need to be regenerated |
| */ |
| static void nh_rt_cache_flush(struct net *net, struct nexthop *nh) |
| { |
| struct fib6_info *f6i; |
| |
| if (!list_empty(&nh->fi_list)) |
| rt_cache_flush(net); |
| |
| list_for_each_entry(f6i, &nh->f6i_list, nh_list) |
| ipv6_stub->fib6_update_sernum(net, f6i); |
| } |
| |
| static int replace_nexthop_grp(struct net *net, struct nexthop *old, |
| struct nexthop *new, const struct nh_config *cfg, |
| struct netlink_ext_ack *extack) |
| { |
| struct nh_res_table *tmp_table = NULL; |
| struct nh_res_table *new_res_table; |
| struct nh_res_table *old_res_table; |
| struct nh_group *oldg, *newg; |
| int i, err; |
| |
| if (!new->is_group) { |
| NL_SET_ERR_MSG(extack, "Can not replace a nexthop group with a nexthop."); |
| return -EINVAL; |
| } |
| |
| oldg = rtnl_dereference(old->nh_grp); |
| newg = rtnl_dereference(new->nh_grp); |
| |
| if (newg->hash_threshold != oldg->hash_threshold) { |
| NL_SET_ERR_MSG(extack, "Can not replace a nexthop group with one of a different type."); |
| return -EINVAL; |
| } |
| |
| if (newg->hash_threshold) { |
| err = call_nexthop_notifiers(net, NEXTHOP_EVENT_REPLACE, new, |
| extack); |
| if (err) |
| return err; |
| } else if (newg->resilient) { |
| new_res_table = rtnl_dereference(newg->res_table); |
| old_res_table = rtnl_dereference(oldg->res_table); |
| |
| /* Accept if num_nh_buckets was not given, but if it was |
| * given, demand that the value be correct. |
| */ |
| if (cfg->nh_grp_res_has_num_buckets && |
| cfg->nh_grp_res_num_buckets != |
| old_res_table->num_nh_buckets) { |
| NL_SET_ERR_MSG(extack, "Can not change number of buckets of a resilient nexthop group."); |
| return -EINVAL; |
| } |
| |
| /* Emit a pre-replace notification so that listeners could veto |
| * a potentially unsupported configuration. Otherwise, |
| * individual bucket replacement notifications would need to be |
| * vetoed, which is something that should only happen if the |
| * bucket is currently active. |
| */ |
| err = call_nexthop_res_table_notifiers(net, new, extack); |
| if (err) |
| return err; |
| |
| if (cfg->nh_grp_res_has_idle_timer) |
| old_res_table->idle_timer = cfg->nh_grp_res_idle_timer; |
| if (cfg->nh_grp_res_has_unbalanced_timer) |
| old_res_table->unbalanced_timer = |
| cfg->nh_grp_res_unbalanced_timer; |
| |
| replace_nexthop_grp_res(oldg, newg); |
| |
| tmp_table = new_res_table; |
| rcu_assign_pointer(newg->res_table, old_res_table); |
| rcu_assign_pointer(newg->spare->res_table, old_res_table); |
| } |
| |
| /* update parents - used by nexthop code for cleanup */ |
| for (i = 0; i < newg->num_nh; i++) |
| newg->nh_entries[i].nh_parent = old; |
| |
| rcu_assign_pointer(old->nh_grp, newg); |
| |
| if (newg->resilient) { |
| /* Make sure concurrent readers are not using 'oldg' anymore. */ |
| synchronize_net(); |
| rcu_assign_pointer(oldg->res_table, tmp_table); |
| rcu_assign_pointer(oldg->spare->res_table, tmp_table); |
| } |
| |
| for (i = 0; i < oldg->num_nh; i++) |
| oldg->nh_entries[i].nh_parent = new; |
| |
| rcu_assign_pointer(new->nh_grp, oldg); |
| |
| return 0; |
| } |
| |
| static void nh_group_v4_update(struct nh_group *nhg) |
| { |
| struct nh_grp_entry *nhges; |
| bool has_v4 = false; |
| int i; |
| |
| nhges = nhg->nh_entries; |
| for (i = 0; i < nhg->num_nh; i++) { |
| struct nh_info *nhi; |
| |
| nhi = rtnl_dereference(nhges[i].nh->nh_info); |
| if (nhi->family == AF_INET) |
| has_v4 = true; |
| } |
| nhg->has_v4 = has_v4; |
| } |
| |
| static int replace_nexthop_single_notify_res(struct net *net, |
| struct nh_res_table *res_table, |
| struct nexthop *old, |
| struct nh_info *oldi, |
| struct nh_info *newi, |
| struct netlink_ext_ack *extack) |
| { |
| u32 nhg_id = res_table->nhg_id; |
| int err; |
| u16 i; |
| |
| for (i = 0; i < res_table->num_nh_buckets; i++) { |
| struct nh_res_bucket *bucket = &res_table->nh_buckets[i]; |
| struct nh_grp_entry *nhge; |
| |
| nhge = rtnl_dereference(bucket->nh_entry); |
| if (nhge->nh == old) { |
| err = __call_nexthop_res_bucket_notifiers(net, nhg_id, |
| i, true, |
| oldi, newi, |
| extack); |
| if (err) |
| goto err_notify; |
| } |
| } |
| |
| return 0; |
| |
| err_notify: |
| while (i-- > 0) { |
| struct nh_res_bucket *bucket = &res_table->nh_buckets[i]; |
| struct nh_grp_entry *nhge; |
| |
| nhge = rtnl_dereference(bucket->nh_entry); |
| if (nhge->nh == old) |
| __call_nexthop_res_bucket_notifiers(net, nhg_id, i, |
| true, newi, oldi, |
| extack); |
| } |
| return err; |
| } |
| |
| static int replace_nexthop_single_notify(struct net *net, |
| struct nexthop *group_nh, |
| struct nexthop *old, |
| struct nh_info *oldi, |
| struct nh_info *newi, |
| struct netlink_ext_ack *extack) |
| { |
| struct nh_group *nhg = rtnl_dereference(group_nh->nh_grp); |
| struct nh_res_table *res_table; |
| |
| if (nhg->hash_threshold) { |
| return call_nexthop_notifiers(net, NEXTHOP_EVENT_REPLACE, |
| group_nh, extack); |
| } else if (nhg->resilient) { |
| res_table = rtnl_dereference(nhg->res_table); |
| return replace_nexthop_single_notify_res(net, res_table, |
| old, oldi, newi, |
| extack); |
| } |
| |
| return -EINVAL; |
| } |
| |
| static int replace_nexthop_single(struct net *net, struct nexthop *old, |
| struct nexthop *new, |
| struct netlink_ext_ack *extack) |
| { |
| u8 old_protocol, old_nh_flags; |
| struct nh_info *oldi, *newi; |
| struct nh_grp_entry *nhge; |
| int err; |
| |
| if (new->is_group) { |
| NL_SET_ERR_MSG(extack, "Can not replace a nexthop with a nexthop group."); |
| return -EINVAL; |
| } |
| |
| err = call_nexthop_notifiers(net, NEXTHOP_EVENT_REPLACE, new, extack); |
| if (err) |
| return err; |
| |
| /* Hardware flags were set on 'old' as 'new' is not in the red-black |
| * tree. Therefore, inherit the flags from 'old' to 'new'. |
| */ |
| new->nh_flags |= old->nh_flags & (RTNH_F_OFFLOAD | RTNH_F_TRAP); |
| |
| oldi = rtnl_dereference(old->nh_info); |
| newi = rtnl_dereference(new->nh_info); |
| |
| newi->nh_parent = old; |
| oldi->nh_parent = new; |
| |
| old_protocol = old->protocol; |
| old_nh_flags = old->nh_flags; |
| |
| old->protocol = new->protocol; |
| old->nh_flags = new->nh_flags; |
| |
| rcu_assign_pointer(old->nh_info, newi); |
| rcu_assign_pointer(new->nh_info, oldi); |
| |
| /* Send a replace notification for all the groups using the nexthop. */ |
| list_for_each_entry(nhge, &old->grp_list, nh_list) { |
| struct nexthop *nhp = nhge->nh_parent; |
| |
| err = replace_nexthop_single_notify(net, nhp, old, oldi, newi, |
| extack); |
| if (err) |
| goto err_notify; |
| } |
| |
| /* When replacing an IPv4 nexthop with an IPv6 nexthop, potentially |
| * update IPv4 indication in all the groups using the nexthop. |
| */ |
| if (oldi->family == AF_INET && newi->family == AF_INET6) { |
| list_for_each_entry(nhge, &old->grp_list, nh_list) { |
| struct nexthop *nhp = nhge->nh_parent; |
| struct nh_group *nhg; |
| |
| nhg = rtnl_dereference(nhp->nh_grp); |
| nh_group_v4_update(nhg); |
| } |
| } |
| |
| return 0; |
| |
| err_notify: |
| rcu_assign_pointer(new->nh_info, newi); |
| rcu_assign_pointer(old->nh_info, oldi); |
| old->nh_flags = old_nh_flags; |
| old->protocol = old_protocol; |
| oldi->nh_parent = old; |
| newi->nh_parent = new; |
| list_for_each_entry_continue_reverse(nhge, &old->grp_list, nh_list) { |
| struct nexthop *nhp = nhge->nh_parent; |
| |
| replace_nexthop_single_notify(net, nhp, old, newi, oldi, NULL); |
| } |
| call_nexthop_notifiers(net, NEXTHOP_EVENT_REPLACE, old, extack); |
| return err; |
| } |
| |
| static void __nexthop_replace_notify(struct net *net, struct nexthop *nh, |
| struct nl_info *info) |
| { |
| struct fib6_info *f6i; |
| |
| if (!list_empty(&nh->fi_list)) { |
| struct fib_info *fi; |
| |
| /* expectation is a few fib_info per nexthop and then |
| * a lot of routes per fib_info. So mark the fib_info |
| * and then walk the fib tables once |
| */ |
| list_for_each_entry(fi, &nh->fi_list, nh_list) |
| fi->nh_updated = true; |
| |
| fib_info_notify_update(net, info); |
| |
| list_for_each_entry(fi, &nh->fi_list, nh_list) |
| fi->nh_updated = false; |
| } |
| |
| list_for_each_entry(f6i, &nh->f6i_list, nh_list) |
| ipv6_stub->fib6_rt_update(net, f6i, info); |
| } |
| |
| /* send RTM_NEWROUTE with REPLACE flag set for all FIB entries |
| * linked to this nexthop and for all groups that the nexthop |
| * is a member of |
| */ |
| static void nexthop_replace_notify(struct net *net, struct nexthop *nh, |
| struct nl_info *info) |
| { |
| struct nh_grp_entry *nhge; |
| |
| __nexthop_replace_notify(net, nh, info); |
| |
| list_for_each_entry(nhge, &nh->grp_list, nh_list) |
| __nexthop_replace_notify(net, nhge->nh_parent, info); |
| } |
| |
| static int replace_nexthop(struct net *net, struct nexthop *old, |
| struct nexthop *new, const struct nh_config *cfg, |
| struct netlink_ext_ack *extack) |
| { |
| bool new_is_reject = false; |
| struct nh_grp_entry *nhge; |
| int err; |
| |
| /* check that existing FIB entries are ok with the |
| * new nexthop definition |
| */ |
| err = fib_check_nh_list(old, new, extack); |
| if (err) |
| return err; |
| |
| err = fib6_check_nh_list(old, new, extack); |
| if (err) |
| return err; |
| |
| if (!new->is_group) { |
| struct nh_info *nhi = rtnl_dereference(new->nh_info); |
| |
| new_is_reject = nhi->reject_nh; |
| } |
| |
| list_for_each_entry(nhge, &old->grp_list, nh_list) { |
| /* if new nexthop is a blackhole, any groups using this |
| * nexthop cannot have more than 1 path |
| */ |
| if (new_is_reject && |
| nexthop_num_path(nhge->nh_parent) > 1) { |
| NL_SET_ERR_MSG(extack, "Blackhole nexthop can not be a member of a group with more than one path"); |
| return -EINVAL; |
| } |
| |
| err = fib_check_nh_list(nhge->nh_parent, new, extack); |
| if (err) |
| return err; |
| |
| err = fib6_check_nh_list(nhge->nh_parent, new, extack); |
| if (err) |
| return err; |
| } |
| |
| if (old->is_group) |
| err = replace_nexthop_grp(net, old, new, cfg, extack); |
| else |
| err = replace_nexthop_single(net, old, new, extack); |
| |
| if (!err) { |
| nh_rt_cache_flush(net, old); |
| |
| __remove_nexthop(net, new, NULL); |
| nexthop_put(new); |
| } |
| |
| return err; |
| } |
| |
| /* called with rtnl_lock held */ |
| static int insert_nexthop(struct net *net, struct nexthop *new_nh, |
| struct nh_config *cfg, struct netlink_ext_ack *extack) |
| { |
| struct rb_node **pp, *parent = NULL, *next; |
| struct rb_root *root = &net->nexthop.rb_root; |
| bool replace = !!(cfg->nlflags & NLM_F_REPLACE); |
| bool create = !!(cfg->nlflags & NLM_F_CREATE); |
| u32 new_id = new_nh->id; |
| int replace_notify = 0; |
| int rc = -EEXIST; |
| |
| pp = &root->rb_node; |
| while (1) { |
| struct nexthop *nh; |
| |
| next = *pp; |
| if (!next) |
| break; |
| |
| parent = next; |
| |
| nh = rb_entry(parent, struct nexthop, rb_node); |
| if (new_id < nh->id) { |
| pp = &next->rb_left; |
| } else if (new_id > nh->id) { |
| pp = &next->rb_right; |
| } else if (replace) { |
| rc = replace_nexthop(net, nh, new_nh, cfg, extack); |
| if (!rc) { |
| new_nh = nh; /* send notification with old nh */ |
| replace_notify = 1; |
| } |
| goto out; |
| } else { |
| /* id already exists and not a replace */ |
| goto out; |
| } |
| } |
| |
| if (replace && !create) { |
| NL_SET_ERR_MSG(extack, "Replace specified without create and no entry exists"); |
| rc = -ENOENT; |
| goto out; |
| } |
| |
| if (new_nh->is_group) { |
| struct nh_group *nhg = rtnl_dereference(new_nh->nh_grp); |
| struct nh_res_table *res_table; |
| |
| if (nhg->resilient) { |
| res_table = rtnl_dereference(nhg->res_table); |
| |
| /* Not passing the number of buckets is OK when |
| * replacing, but not when creating a new group. |
| */ |
| if (!cfg->nh_grp_res_has_num_buckets) { |
| NL_SET_ERR_MSG(extack, "Number of buckets not specified for nexthop group insertion"); |
| rc = -EINVAL; |
| goto out; |
| } |
| |
| nh_res_group_rebalance(nhg, res_table); |
| |
| /* Do not send bucket notifications, we do full |
| * notification below. |
| */ |
| nh_res_table_upkeep(res_table, false, false); |
| } |
| } |
| |
| rb_link_node_rcu(&new_nh->rb_node, parent, pp); |
| rb_insert_color(&new_nh->rb_node, root); |
| |
| /* The initial insertion is a full notification for hash-threshold as |
| * well as resilient groups. |
| */ |
| rc = call_nexthop_notifiers(net, NEXTHOP_EVENT_REPLACE, new_nh, extack); |
| if (rc) |
| rb_erase(&new_nh->rb_node, &net->nexthop.rb_root); |
| |
| out: |
| if (!rc) { |
| nh_base_seq_inc(net); |
| nexthop_notify(RTM_NEWNEXTHOP, new_nh, &cfg->nlinfo); |
| if (replace_notify && net->ipv4.sysctl_nexthop_compat_mode) |
| nexthop_replace_notify(net, new_nh, &cfg->nlinfo); |
| } |
| |
| return rc; |
| } |
| |
| /* rtnl */ |
| /* remove all nexthops tied to a device being deleted */ |
| static void nexthop_flush_dev(struct net_device *dev, unsigned long event) |
| { |
| unsigned int hash = nh_dev_hashfn(dev->ifindex); |
| struct net *net = dev_net(dev); |
| struct hlist_head *head = &net->nexthop.devhash[hash]; |
| struct hlist_node *n; |
| struct nh_info *nhi; |
| |
| hlist_for_each_entry_safe(nhi, n, head, dev_hash) { |
| if (nhi->fib_nhc.nhc_dev != dev) |
| continue; |
| |
| if (nhi->reject_nh && |
| (event == NETDEV_DOWN || event == NETDEV_CHANGE)) |
| continue; |
| |
| remove_nexthop(net, nhi->nh_parent, NULL); |
| } |
| } |
| |
| /* rtnl; called when net namespace is deleted */ |
| static void flush_all_nexthops(struct net *net) |
| { |
| struct rb_root *root = &net->nexthop.rb_root; |
| struct rb_node *node; |
| struct nexthop *nh; |
| |
| while ((node = rb_first(root))) { |
| nh = rb_entry(node, struct nexthop, rb_node); |
| remove_nexthop(net, nh, NULL); |
| cond_resched(); |
| } |
| } |
| |
| static struct nexthop *nexthop_create_group(struct net *net, |
| struct nh_config *cfg) |
| { |
| struct nlattr *grps_attr = cfg->nh_grp; |
| struct nexthop_grp *entry = nla_data(grps_attr); |
| u16 num_nh = nla_len(grps_attr) / sizeof(*entry); |
| struct nh_group *nhg; |
| struct nexthop *nh; |
| int err; |
| int i; |
| |
| if (WARN_ON(!num_nh)) |
| return ERR_PTR(-EINVAL); |
| |
| nh = nexthop_alloc(); |
| if (!nh) |
| return ERR_PTR(-ENOMEM); |
| |
| nh->is_group = 1; |
| |
| nhg = nexthop_grp_alloc(num_nh); |
| if (!nhg) { |
| kfree(nh); |
| return ERR_PTR(-ENOMEM); |
| } |
| |
| /* spare group used for removals */ |
| nhg->spare = nexthop_grp_alloc(num_nh); |
| if (!nhg->spare) { |
| kfree(nhg); |
| kfree(nh); |
| return ERR_PTR(-ENOMEM); |
| } |
| nhg->spare->spare = nhg; |
| |
| for (i = 0; i < nhg->num_nh; ++i) { |
| struct nexthop *nhe; |
| struct nh_info *nhi; |
| |
| nhe = nexthop_find_by_id(net, entry[i].id); |
| if (!nexthop_get(nhe)) { |
| err = -ENOENT; |
| goto out_no_nh; |
| } |
| |
| nhi = rtnl_dereference(nhe->nh_info); |
| if (nhi->family == AF_INET) |
| nhg->has_v4 = true; |
| |
| nhg->nh_entries[i].nh = nhe; |
| nhg->nh_entries[i].weight = entry[i].weight + 1; |
| list_add(&nhg->nh_entries[i].nh_list, &nhe->grp_list); |
| nhg->nh_entries[i].nh_parent = nh; |
| } |
| |
| if (cfg->nh_grp_type == NEXTHOP_GRP_TYPE_MPATH) { |
| nhg->hash_threshold = 1; |
| nhg->is_multipath = true; |
| } else if (cfg->nh_grp_type == NEXTHOP_GRP_TYPE_RES) { |
| struct nh_res_table *res_table; |
| |
| res_table = nexthop_res_table_alloc(net, cfg->nh_id, cfg); |
| if (!res_table) { |
| err = -ENOMEM; |
| goto out_no_nh; |
| } |
| |
| rcu_assign_pointer(nhg->spare->res_table, res_table); |
| rcu_assign_pointer(nhg->res_table, res_table); |
| nhg->resilient = true; |
| nhg->is_multipath = true; |
| } |
| |
| WARN_ON_ONCE(nhg->hash_threshold + nhg->resilient != 1); |
| |
| if (nhg->hash_threshold) |
| nh_hthr_group_rebalance(nhg); |
| |
| if (cfg->nh_fdb) |
| nhg->fdb_nh = 1; |
| |
| rcu_assign_pointer(nh->nh_grp, nhg); |
| |
| return nh; |
| |
| out_no_nh: |
| for (i--; i >= 0; --i) { |
| list_del(&nhg->nh_entries[i].nh_list); |
| nexthop_put(nhg->nh_entries[i].nh); |
| } |
| |
| kfree(nhg->spare); |
| kfree(nhg); |
| kfree(nh); |
| |
| return ERR_PTR(err); |
| } |
| |
| static int nh_create_ipv4(struct net *net, struct nexthop *nh, |
| struct nh_info *nhi, struct nh_config *cfg, |
| struct netlink_ext_ack *extack) |
| { |
| struct fib_nh *fib_nh = &nhi->fib_nh; |
| struct fib_config fib_cfg = { |
| .fc_oif = cfg->nh_ifindex, |
| .fc_gw4 = cfg->gw.ipv4, |
| .fc_gw_family = cfg->gw.ipv4 ? AF_INET : 0, |
| .fc_flags = cfg->nh_flags, |
| .fc_nlinfo = cfg->nlinfo, |
| .fc_encap = cfg->nh_encap, |
| .fc_encap_type = cfg->nh_encap_type, |
| }; |
| u32 tb_id = (cfg->dev ? l3mdev_fib_table(cfg->dev) : RT_TABLE_MAIN); |
| int err; |
| |
| err = fib_nh_init(net, fib_nh, &fib_cfg, 1, extack); |
| if (err) { |
| fib_nh_release(net, fib_nh); |
| goto out; |
| } |
| |
| if (nhi->fdb_nh) |
| goto out; |
| |
| /* sets nh_dev if successful */ |
| err = fib_check_nh(net, fib_nh, tb_id, 0, extack); |
| if (!err) { |
| nh->nh_flags = fib_nh->fib_nh_flags; |
| fib_info_update_nhc_saddr(net, &fib_nh->nh_common, |
| fib_nh->fib_nh_scope); |
| } else { |
| fib_nh_release(net, fib_nh); |
| } |
| out: |
| return err; |
| } |
| |
| static int nh_create_ipv6(struct net *net, struct nexthop *nh, |
| struct nh_info *nhi, struct nh_config *cfg, |
| struct netlink_ext_ack *extack) |
| { |
| struct fib6_nh *fib6_nh = &nhi->fib6_nh; |
| struct fib6_config fib6_cfg = { |
| .fc_table = l3mdev_fib_table(cfg->dev), |
| .fc_ifindex = cfg->nh_ifindex, |
| .fc_gateway = cfg->gw.ipv6, |
| .fc_flags = cfg->nh_flags, |
| .fc_nlinfo = cfg->nlinfo, |
| .fc_encap = cfg->nh_encap, |
| .fc_encap_type = cfg->nh_encap_type, |
| .fc_is_fdb = cfg->nh_fdb, |
| }; |
| int err; |
| |
| if (!ipv6_addr_any(&cfg->gw.ipv6)) |
| fib6_cfg.fc_flags |= RTF_GATEWAY; |
| |
| /* sets nh_dev if successful */ |
| err = ipv6_stub->fib6_nh_init(net, fib6_nh, &fib6_cfg, GFP_KERNEL, |
| extack); |
| if (err) |
| ipv6_stub->fib6_nh_release(fib6_nh); |
| else |
| nh->nh_flags = fib6_nh->fib_nh_flags; |
| |
| return err; |
| } |
| |
| static struct nexthop *nexthop_create(struct net *net, struct nh_config *cfg, |
| struct netlink_ext_ack *extack) |
| { |
| struct nh_info *nhi; |
| struct nexthop *nh; |
| int err = 0; |
| |
| nh = nexthop_alloc(); |
| if (!nh) |
| return ERR_PTR(-ENOMEM); |
| |
| nhi = kzalloc(sizeof(*nhi), GFP_KERNEL); |
| if (!nhi) { |
| kfree(nh); |
| return ERR_PTR(-ENOMEM); |
| } |
| |
| nh->nh_flags = cfg->nh_flags; |
| nh->net = net; |
| |
| nhi->nh_parent = nh; |
| nhi->family = cfg->nh_family; |
| nhi->fib_nhc.nhc_scope = RT_SCOPE_LINK; |
| |
| if (cfg->nh_fdb) |
| nhi->fdb_nh = 1; |
| |
| if (cfg->nh_blackhole) { |
| nhi->reject_nh = 1; |
| cfg->nh_ifindex = net->loopback_dev->ifindex; |
| } |
| |
| switch (cfg->nh_family) { |
| case AF_INET: |
| err = nh_create_ipv4(net, nh, nhi, cfg, extack); |
| break; |
| case AF_INET6: |
| err = nh_create_ipv6(net, nh, nhi, cfg, extack); |
| break; |
| } |
| |
| if (err) { |
| kfree(nhi); |
| kfree(nh); |
| return ERR_PTR(err); |
| } |
| |
| /* add the entry to the device based hash */ |
| if (!nhi->fdb_nh) |
| nexthop_devhash_add(net, nhi); |
| |
| rcu_assign_pointer(nh->nh_info, nhi); |
| |
| return nh; |
| } |
| |
| /* called with rtnl lock held */ |
| static struct nexthop *nexthop_add(struct net *net, struct nh_config *cfg, |
| struct netlink_ext_ack *extack) |
| { |
| struct nexthop *nh; |
| int err; |
| |
| if (cfg->nlflags & NLM_F_REPLACE && !cfg->nh_id) { |
| NL_SET_ERR_MSG(extack, "Replace requires nexthop id"); |
| return ERR_PTR(-EINVAL); |
| } |
| |
| if (!cfg->nh_id) { |
| cfg->nh_id = nh_find_unused_id(net); |
| if (!cfg->nh_id) { |
| NL_SET_ERR_MSG(extack, "No unused id"); |
| return ERR_PTR(-EINVAL); |
| } |
| } |
| |
| if (cfg->nh_grp) |
| nh = nexthop_create_group(net, cfg); |
| else |
| nh = nexthop_create(net, cfg, extack); |
| |
| if (IS_ERR(nh)) |
| return nh; |
| |
| refcount_set(&nh->refcnt, 1); |
| nh->id = cfg->nh_id; |
| nh->protocol = cfg->nh_protocol; |
| nh->net = net; |
| |
| err = insert_nexthop(net, nh, cfg, extack); |
| if (err) { |
| __remove_nexthop(net, nh, NULL); |
| nexthop_put(nh); |
| nh = ERR_PTR(err); |
| } |
| |
| return nh; |
| } |
| |
| static int rtm_nh_get_timer(struct nlattr *attr, unsigned long fallback, |
| unsigned long *timer_p, bool *has_p, |
| struct netlink_ext_ack *extack) |
| { |
| unsigned long timer; |
| u32 value; |
| |
| if (!attr) { |
| *timer_p = fallback; |
| *has_p = false; |
| return 0; |
| } |
| |
| value = nla_get_u32(attr); |
| timer = clock_t_to_jiffies(value); |
| if (timer == ~0UL) { |
| NL_SET_ERR_MSG(extack, "Timer value too large"); |
| return -EINVAL; |
| } |
| |
| *timer_p = timer; |
| *has_p = true; |
| return 0; |
| } |
| |
| static int rtm_to_nh_config_grp_res(struct nlattr *res, struct nh_config *cfg, |
| struct netlink_ext_ack *extack) |
| { |
| struct nlattr *tb[ARRAY_SIZE(rtm_nh_res_policy_new)] = {}; |
| int err; |
| |
| if (res) { |
| err = nla_parse_nested(tb, |
| ARRAY_SIZE(rtm_nh_res_policy_new) - 1, |
| res, rtm_nh_res_policy_new, extack); |
| if (err < 0) |
| return err; |
| } |
| |
| if (tb[NHA_RES_GROUP_BUCKETS]) { |
| cfg->nh_grp_res_num_buckets = |
| nla_get_u16(tb[NHA_RES_GROUP_BUCKETS]); |
| cfg->nh_grp_res_has_num_buckets = true; |
| if (!cfg->nh_grp_res_num_buckets) { |
| NL_SET_ERR_MSG(extack, "Number of buckets needs to be non-0"); |
| return -EINVAL; |
| } |
| } |
| |
| err = rtm_nh_get_timer(tb[NHA_RES_GROUP_IDLE_TIMER], |
| NH_RES_DEFAULT_IDLE_TIMER, |
| &cfg->nh_grp_res_idle_timer, |
| &cfg->nh_grp_res_has_idle_timer, |
| extack); |
| if (err) |
| return err; |
| |
| return rtm_nh_get_timer(tb[NHA_RES_GROUP_UNBALANCED_TIMER], |
| NH_RES_DEFAULT_UNBALANCED_TIMER, |
| &cfg->nh_grp_res_unbalanced_timer, |
| &cfg->nh_grp_res_has_unbalanced_timer, |
| extack); |
| } |
| |
| static int rtm_to_nh_config(struct net *net, struct sk_buff *skb, |
| struct nlmsghdr *nlh, struct nh_config *cfg, |
| struct netlink_ext_ack *extack) |
| { |
| struct nhmsg *nhm = nlmsg_data(nlh); |
| struct nlattr *tb[ARRAY_SIZE(rtm_nh_policy_new)]; |
| int err; |
| |
| err = nlmsg_parse(nlh, sizeof(*nhm), tb, |
| ARRAY_SIZE(rtm_nh_policy_new) - 1, |
| rtm_nh_policy_new, extack); |
| if (err < 0) |
| return err; |
| |
| err = -EINVAL; |
| if (nhm->resvd || nhm->nh_scope) { |
| NL_SET_ERR_MSG(extack, "Invalid values in ancillary header"); |
| goto out; |
| } |
| if (nhm->nh_flags & ~NEXTHOP_VALID_USER_FLAGS) { |
| NL_SET_ERR_MSG(extack, "Invalid nexthop flags in ancillary header"); |
| goto out; |
| } |
| |
| switch (nhm->nh_family) { |
| case AF_INET: |
| case AF_INET6: |
| break; |
| case AF_UNSPEC: |
| if (tb[NHA_GROUP]) |
| break; |
| fallthrough; |
| default: |
| NL_SET_ERR_MSG(extack, "Invalid address family"); |
| goto out; |
| } |
| |
| memset(cfg, 0, sizeof(*cfg)); |
| cfg->nlflags = nlh->nlmsg_flags; |
| cfg->nlinfo.portid = NETLINK_CB(skb).portid; |
| cfg->nlinfo.nlh = nlh; |
| cfg->nlinfo.nl_net = net; |
| |
| cfg->nh_family = nhm->nh_family; |
| cfg->nh_protocol = nhm->nh_protocol; |
| cfg->nh_flags = nhm->nh_flags; |
| |
| if (tb[NHA_ID]) |
| cfg->nh_id = nla_get_u32(tb[NHA_ID]); |
| |
| if (tb[NHA_FDB]) { |
| if (tb[NHA_OIF] || tb[NHA_BLACKHOLE] || |
| tb[NHA_ENCAP] || tb[NHA_ENCAP_TYPE]) { |
| NL_SET_ERR_MSG(extack, "Fdb attribute can not be used with encap, oif or blackhole"); |
| goto out; |
| } |
| if (nhm->nh_flags) { |
| NL_SET_ERR_MSG(extack, "Unsupported nexthop flags in ancillary header"); |
| goto out; |
| } |
| cfg->nh_fdb = nla_get_flag(tb[NHA_FDB]); |
| } |
| |
| if (tb[NHA_GROUP]) { |
| if (nhm->nh_family != AF_UNSPEC) { |
| NL_SET_ERR_MSG(extack, "Invalid family for group"); |
| goto out; |
| } |
| cfg->nh_grp = tb[NHA_GROUP]; |
| |
| cfg->nh_grp_type = NEXTHOP_GRP_TYPE_MPATH; |
| if (tb[NHA_GROUP_TYPE]) |
| cfg->nh_grp_type = nla_get_u16(tb[NHA_GROUP_TYPE]); |
| |
| if (cfg->nh_grp_type > NEXTHOP_GRP_TYPE_MAX) { |
| NL_SET_ERR_MSG(extack, "Invalid group type"); |
| goto out; |
| } |
| err = nh_check_attr_group(net, tb, ARRAY_SIZE(tb), |
| cfg->nh_grp_type, extack); |
| if (err) |
| goto out; |
| |
| if (cfg->nh_grp_type == NEXTHOP_GRP_TYPE_RES) |
| err = rtm_to_nh_config_grp_res(tb[NHA_RES_GROUP], |
| cfg, extack); |
| |
| /* no other attributes should be set */ |
| goto out; |
| } |
| |
| if (tb[NHA_BLACKHOLE]) { |
| if (tb[NHA_GATEWAY] || tb[NHA_OIF] || |
| tb[NHA_ENCAP] || tb[NHA_ENCAP_TYPE] || tb[NHA_FDB]) { |
| NL_SET_ERR_MSG(extack, "Blackhole attribute can not be used with gateway, oif, encap or fdb"); |
| goto out; |
| } |
| |
| cfg->nh_blackhole = 1; |
| err = 0; |
| goto out; |
| } |
| |
| if (!cfg->nh_fdb && !tb[NHA_OIF]) { |
| NL_SET_ERR_MSG(extack, "Device attribute required for non-blackhole and non-fdb nexthops"); |
| goto out; |
| } |
| |
| if (!cfg->nh_fdb && tb[NHA_OIF]) { |
| cfg->nh_ifindex = nla_get_u32(tb[NHA_OIF]); |
| if (cfg->nh_ifindex) |
| cfg->dev = __dev_get_by_index(net, cfg->nh_ifindex); |
| |
| if (!cfg->dev) { |
| NL_SET_ERR_MSG(extack, "Invalid device index"); |
| goto out; |
| } else if (!(cfg->dev->flags & IFF_UP)) { |
| NL_SET_ERR_MSG(extack, "Nexthop device is not up"); |
| err = -ENETDOWN; |
| goto out; |
| } else if (!netif_carrier_ok(cfg->dev)) { |
| NL_SET_ERR_MSG(extack, "Carrier for nexthop device is down"); |
| err = -ENETDOWN; |
| goto out; |
| } |
| } |
| |
| err = -EINVAL; |
| if (tb[NHA_GATEWAY]) { |
| struct nlattr *gwa = tb[NHA_GATEWAY]; |
| |
| switch (cfg->nh_family) { |
| case AF_INET: |
| if (nla_len(gwa) != sizeof(u32)) { |
| NL_SET_ERR_MSG(extack, "Invalid gateway"); |
| goto out; |
| } |
| cfg->gw.ipv4 = nla_get_be32(gwa); |
| break; |
| case AF_INET6: |
| if (nla_len(gwa) != sizeof(struct in6_addr)) { |
| NL_SET_ERR_MSG(extack, "Invalid gateway"); |
| goto out; |
| } |
| cfg->gw.ipv6 = nla_get_in6_addr(gwa); |
| break; |
| default: |
| NL_SET_ERR_MSG(extack, |
| "Unknown address family for gateway"); |
| goto out; |
| } |
| } else { |
| /* device only nexthop (no gateway) */ |
| if (cfg->nh_flags & RTNH_F_ONLINK) { |
| NL_SET_ERR_MSG(extack, |
| "ONLINK flag can not be set for nexthop without a gateway"); |
| goto out; |
| } |
| } |
| |
| if (tb[NHA_ENCAP]) { |
| cfg->nh_encap = tb[NHA_ENCAP]; |
| |
| if (!tb[NHA_ENCAP_TYPE]) { |
| NL_SET_ERR_MSG(extack, "LWT encapsulation type is missing"); |
| goto out; |
| } |
| |
| cfg->nh_encap_type = nla_get_u16(tb[NHA_ENCAP_TYPE]); |
| err = lwtunnel_valid_encap_type(cfg->nh_encap_type, extack); |
| if (err < 0) |
| goto out; |
| |
| } else if (tb[NHA_ENCAP_TYPE]) { |
| NL_SET_ERR_MSG(extack, "LWT encapsulation attribute is missing"); |
| goto out; |
| } |
| |
| |
| err = 0; |
| out: |
| return err; |
| } |
| |
| /* rtnl */ |
| static int rtm_new_nexthop(struct sk_buff *skb, struct nlmsghdr *nlh, |
| struct netlink_ext_ack *extack) |
| { |
| struct net *net = sock_net(skb->sk); |
| struct nh_config cfg; |
| struct nexthop *nh; |
| int err; |
| |
| err = rtm_to_nh_config(net, skb, nlh, &cfg, extack); |
| if (!err) { |
| nh = nexthop_add(net, &cfg, extack); |
| if (IS_ERR(nh)) |
| err = PTR_ERR(nh); |
| } |
| |
| return err; |
| } |
| |
| static int __nh_valid_get_del_req(const struct nlmsghdr *nlh, |
| struct nlattr **tb, u32 *id, |
| struct netlink_ext_ack *extack) |
| { |
| struct nhmsg *nhm = nlmsg_data(nlh); |
| |
| if (nhm->nh_protocol || nhm->resvd || nhm->nh_scope || nhm->nh_flags) { |
| NL_SET_ERR_MSG(extack, "Invalid values in header"); |
| return -EINVAL; |
| } |
| |
| if (!tb[NHA_ID]) { |
| NL_SET_ERR_MSG(extack, "Nexthop id is missing"); |
| return -EINVAL; |
| } |
| |
| *id = nla_get_u32(tb[NHA_ID]); |
| if (!(*id)) { |
| NL_SET_ERR_MSG(extack, "Invalid nexthop id"); |
| return -EINVAL; |
| } |
| |
| return 0; |
| } |
| |
| static int nh_valid_get_del_req(const struct nlmsghdr *nlh, u32 *id, |
| struct netlink_ext_ack *extack) |
| { |
| struct nlattr *tb[ARRAY_SIZE(rtm_nh_policy_get)]; |
| int err; |
| |
| err = nlmsg_parse(nlh, sizeof(struct nhmsg), tb, |
| ARRAY_SIZE(rtm_nh_policy_get) - 1, |
| rtm_nh_policy_get, extack); |
| if (err < 0) |
| return err; |
| |
| return __nh_valid_get_del_req(nlh, tb, id, extack); |
| } |
| |
| /* rtnl */ |
| static int rtm_del_nexthop(struct sk_buff *skb, struct nlmsghdr *nlh, |
| struct netlink_ext_ack *extack) |
| { |
| struct net *net = sock_net(skb->sk); |
| struct nl_info nlinfo = { |
| .nlh = nlh, |
| .nl_net = net, |
| .portid = NETLINK_CB(skb).portid, |
| }; |
| struct nexthop *nh; |
| int err; |
| u32 id; |
| |
| err = nh_valid_get_del_req(nlh, &id, extack); |
| if (err) |
| return err; |
| |
| nh = nexthop_find_by_id(net, id); |
| if (!nh) |
| return -ENOENT; |
| |
| remove_nexthop(net, nh, &nlinfo); |
| |
| return 0; |
| } |
| |
| /* rtnl */ |
| static int rtm_get_nexthop(struct sk_buff *in_skb, struct nlmsghdr *nlh, |
| struct netlink_ext_ack *extack) |
| { |
| struct net *net = sock_net(in_skb->sk); |
| struct sk_buff *skb = NULL; |
| struct nexthop *nh; |
| int err; |
| u32 id; |
| |
| err = nh_valid_get_del_req(nlh, &id, extack); |
| if (err) |
| return err; |
| |
| err = -ENOBUFS; |
| skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
| if (!skb) |
| goto out; |
| |
| err = -ENOENT; |
| nh = nexthop_find_by_id(net, id); |
| if (!nh) |
| goto errout_free; |
| |
| err = nh_fill_node(skb, nh, RTM_NEWNEXTHOP, NETLINK_CB(in_skb).portid, |
| nlh->nlmsg_seq, 0); |
| if (err < 0) { |
| WARN_ON(err == -EMSGSIZE); |
| goto errout_free; |
| } |
| |
| err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); |
| out: |
| return err; |
| errout_free: |
| kfree_skb( |