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![Petr Machata](/assets/img/avatar_default.png)
In order to allow different handling for next-hop tree dumper and for bucket dumper, parameterize the next-hop tree walker with a callback. Add rtm_dump_nexthop_cb() with just the bits relevant for next-hop tree dumping. Signed-off-by: Petr Machata <petrm@nvidia.com> Reviewed-by: Ido Schimmel <idosch@nvidia.com> Reviewed-by: David Ahern <dsahern@kernel.org> Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2314 lines
52 KiB
C
2314 lines
52 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* Generic nexthop implementation
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*
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* Copyright (c) 2017-19 Cumulus Networks
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* Copyright (c) 2017-19 David Ahern <dsa@cumulusnetworks.com>
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*/
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#include <linux/nexthop.h>
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#include <linux/rtnetlink.h>
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#include <linux/slab.h>
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#include <net/arp.h>
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#include <net/ipv6_stubs.h>
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#include <net/lwtunnel.h>
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#include <net/ndisc.h>
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#include <net/nexthop.h>
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#include <net/route.h>
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#include <net/sock.h>
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static void remove_nexthop(struct net *net, struct nexthop *nh,
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struct nl_info *nlinfo);
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#define NH_DEV_HASHBITS 8
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#define NH_DEV_HASHSIZE (1U << NH_DEV_HASHBITS)
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static const struct nla_policy rtm_nh_policy_new[] = {
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[NHA_ID] = { .type = NLA_U32 },
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[NHA_GROUP] = { .type = NLA_BINARY },
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[NHA_GROUP_TYPE] = { .type = NLA_U16 },
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[NHA_BLACKHOLE] = { .type = NLA_FLAG },
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[NHA_OIF] = { .type = NLA_U32 },
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[NHA_GATEWAY] = { .type = NLA_BINARY },
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[NHA_ENCAP_TYPE] = { .type = NLA_U16 },
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[NHA_ENCAP] = { .type = NLA_NESTED },
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[NHA_FDB] = { .type = NLA_FLAG },
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};
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static const struct nla_policy rtm_nh_policy_get[] = {
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[NHA_ID] = { .type = NLA_U32 },
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};
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static const struct nla_policy rtm_nh_policy_dump[] = {
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[NHA_OIF] = { .type = NLA_U32 },
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[NHA_GROUPS] = { .type = NLA_FLAG },
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[NHA_MASTER] = { .type = NLA_U32 },
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[NHA_FDB] = { .type = NLA_FLAG },
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};
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static bool nexthop_notifiers_is_empty(struct net *net)
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{
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return !net->nexthop.notifier_chain.head;
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}
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static void
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__nh_notifier_single_info_init(struct nh_notifier_single_info *nh_info,
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const struct nexthop *nh)
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{
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struct nh_info *nhi = rtnl_dereference(nh->nh_info);
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nh_info->dev = nhi->fib_nhc.nhc_dev;
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nh_info->gw_family = nhi->fib_nhc.nhc_gw_family;
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if (nh_info->gw_family == AF_INET)
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nh_info->ipv4 = nhi->fib_nhc.nhc_gw.ipv4;
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else if (nh_info->gw_family == AF_INET6)
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nh_info->ipv6 = nhi->fib_nhc.nhc_gw.ipv6;
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nh_info->is_reject = nhi->reject_nh;
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nh_info->is_fdb = nhi->fdb_nh;
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nh_info->has_encap = !!nhi->fib_nhc.nhc_lwtstate;
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}
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static int nh_notifier_single_info_init(struct nh_notifier_info *info,
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const struct nexthop *nh)
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{
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info->type = NH_NOTIFIER_INFO_TYPE_SINGLE;
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info->nh = kzalloc(sizeof(*info->nh), GFP_KERNEL);
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if (!info->nh)
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return -ENOMEM;
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__nh_notifier_single_info_init(info->nh, nh);
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return 0;
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}
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static void nh_notifier_single_info_fini(struct nh_notifier_info *info)
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{
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kfree(info->nh);
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}
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static int nh_notifier_mp_info_init(struct nh_notifier_info *info,
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struct nh_group *nhg)
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{
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u16 num_nh = nhg->num_nh;
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int i;
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info->type = NH_NOTIFIER_INFO_TYPE_GRP;
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info->nh_grp = kzalloc(struct_size(info->nh_grp, nh_entries, num_nh),
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GFP_KERNEL);
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if (!info->nh_grp)
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return -ENOMEM;
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info->nh_grp->num_nh = num_nh;
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info->nh_grp->is_fdb = nhg->fdb_nh;
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for (i = 0; i < num_nh; i++) {
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struct nh_grp_entry *nhge = &nhg->nh_entries[i];
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info->nh_grp->nh_entries[i].id = nhge->nh->id;
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info->nh_grp->nh_entries[i].weight = nhge->weight;
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__nh_notifier_single_info_init(&info->nh_grp->nh_entries[i].nh,
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nhge->nh);
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}
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return 0;
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}
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static int nh_notifier_grp_info_init(struct nh_notifier_info *info,
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const struct nexthop *nh)
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{
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struct nh_group *nhg = rtnl_dereference(nh->nh_grp);
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if (nhg->mpath)
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return nh_notifier_mp_info_init(info, nhg);
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return -EINVAL;
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}
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static void nh_notifier_grp_info_fini(struct nh_notifier_info *info,
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const struct nexthop *nh)
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{
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struct nh_group *nhg = rtnl_dereference(nh->nh_grp);
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if (nhg->mpath)
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kfree(info->nh_grp);
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}
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static int nh_notifier_info_init(struct nh_notifier_info *info,
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const struct nexthop *nh)
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{
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info->id = nh->id;
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if (nh->is_group)
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return nh_notifier_grp_info_init(info, nh);
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else
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return nh_notifier_single_info_init(info, nh);
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}
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static void nh_notifier_info_fini(struct nh_notifier_info *info,
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const struct nexthop *nh)
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{
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if (nh->is_group)
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nh_notifier_grp_info_fini(info, nh);
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else
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nh_notifier_single_info_fini(info);
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}
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static int call_nexthop_notifiers(struct net *net,
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enum nexthop_event_type event_type,
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struct nexthop *nh,
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struct netlink_ext_ack *extack)
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{
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struct nh_notifier_info info = {
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.net = net,
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.extack = extack,
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};
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int err;
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ASSERT_RTNL();
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if (nexthop_notifiers_is_empty(net))
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return 0;
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err = nh_notifier_info_init(&info, nh);
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if (err) {
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NL_SET_ERR_MSG(extack, "Failed to initialize nexthop notifier info");
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return err;
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}
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err = blocking_notifier_call_chain(&net->nexthop.notifier_chain,
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event_type, &info);
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nh_notifier_info_fini(&info, nh);
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return notifier_to_errno(err);
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}
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static int call_nexthop_notifier(struct notifier_block *nb, struct net *net,
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enum nexthop_event_type event_type,
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struct nexthop *nh,
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struct netlink_ext_ack *extack)
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{
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struct nh_notifier_info info = {
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.net = net,
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.extack = extack,
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};
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int err;
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err = nh_notifier_info_init(&info, nh);
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if (err)
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return err;
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err = nb->notifier_call(nb, event_type, &info);
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nh_notifier_info_fini(&info, nh);
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return notifier_to_errno(err);
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}
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static unsigned int nh_dev_hashfn(unsigned int val)
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{
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unsigned int mask = NH_DEV_HASHSIZE - 1;
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return (val ^
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(val >> NH_DEV_HASHBITS) ^
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(val >> (NH_DEV_HASHBITS * 2))) & mask;
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}
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static void nexthop_devhash_add(struct net *net, struct nh_info *nhi)
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{
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struct net_device *dev = nhi->fib_nhc.nhc_dev;
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struct hlist_head *head;
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unsigned int hash;
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WARN_ON(!dev);
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hash = nh_dev_hashfn(dev->ifindex);
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head = &net->nexthop.devhash[hash];
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hlist_add_head(&nhi->dev_hash, head);
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}
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static void nexthop_free_group(struct nexthop *nh)
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{
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struct nh_group *nhg;
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int i;
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nhg = rcu_dereference_raw(nh->nh_grp);
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for (i = 0; i < nhg->num_nh; ++i) {
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struct nh_grp_entry *nhge = &nhg->nh_entries[i];
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WARN_ON(!list_empty(&nhge->nh_list));
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nexthop_put(nhge->nh);
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}
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WARN_ON(nhg->spare == nhg);
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kfree(nhg->spare);
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kfree(nhg);
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}
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static void nexthop_free_single(struct nexthop *nh)
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{
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struct nh_info *nhi;
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nhi = rcu_dereference_raw(nh->nh_info);
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switch (nhi->family) {
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case AF_INET:
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fib_nh_release(nh->net, &nhi->fib_nh);
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break;
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case AF_INET6:
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ipv6_stub->fib6_nh_release(&nhi->fib6_nh);
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break;
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}
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kfree(nhi);
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}
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void nexthop_free_rcu(struct rcu_head *head)
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{
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struct nexthop *nh = container_of(head, struct nexthop, rcu);
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if (nh->is_group)
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nexthop_free_group(nh);
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else
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nexthop_free_single(nh);
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kfree(nh);
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}
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EXPORT_SYMBOL_GPL(nexthop_free_rcu);
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static struct nexthop *nexthop_alloc(void)
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{
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struct nexthop *nh;
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nh = kzalloc(sizeof(struct nexthop), GFP_KERNEL);
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if (nh) {
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INIT_LIST_HEAD(&nh->fi_list);
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INIT_LIST_HEAD(&nh->f6i_list);
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INIT_LIST_HEAD(&nh->grp_list);
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INIT_LIST_HEAD(&nh->fdb_list);
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}
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return nh;
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}
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static struct nh_group *nexthop_grp_alloc(u16 num_nh)
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{
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struct nh_group *nhg;
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nhg = kzalloc(struct_size(nhg, nh_entries, num_nh), GFP_KERNEL);
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if (nhg)
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nhg->num_nh = num_nh;
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return nhg;
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}
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static void nh_base_seq_inc(struct net *net)
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{
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while (++net->nexthop.seq == 0)
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;
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}
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/* no reference taken; rcu lock or rtnl must be held */
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struct nexthop *nexthop_find_by_id(struct net *net, u32 id)
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{
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struct rb_node **pp, *parent = NULL, *next;
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pp = &net->nexthop.rb_root.rb_node;
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while (1) {
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struct nexthop *nh;
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next = rcu_dereference_raw(*pp);
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if (!next)
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break;
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parent = next;
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nh = rb_entry(parent, struct nexthop, rb_node);
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if (id < nh->id)
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pp = &next->rb_left;
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else if (id > nh->id)
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pp = &next->rb_right;
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else
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return nh;
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}
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return NULL;
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}
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EXPORT_SYMBOL_GPL(nexthop_find_by_id);
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/* used for auto id allocation; called with rtnl held */
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static u32 nh_find_unused_id(struct net *net)
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{
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u32 id_start = net->nexthop.last_id_allocated;
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while (1) {
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net->nexthop.last_id_allocated++;
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if (net->nexthop.last_id_allocated == id_start)
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break;
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if (!nexthop_find_by_id(net, net->nexthop.last_id_allocated))
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return net->nexthop.last_id_allocated;
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}
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return 0;
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}
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static int nla_put_nh_group(struct sk_buff *skb, struct nh_group *nhg)
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{
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struct nexthop_grp *p;
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size_t len = nhg->num_nh * sizeof(*p);
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struct nlattr *nla;
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u16 group_type = 0;
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int i;
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if (nhg->mpath)
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group_type = NEXTHOP_GRP_TYPE_MPATH;
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if (nla_put_u16(skb, NHA_GROUP_TYPE, group_type))
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goto nla_put_failure;
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nla = nla_reserve(skb, NHA_GROUP, len);
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if (!nla)
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goto nla_put_failure;
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p = nla_data(nla);
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for (i = 0; i < nhg->num_nh; ++i) {
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p->id = nhg->nh_entries[i].nh->id;
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p->weight = nhg->nh_entries[i].weight - 1;
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p += 1;
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}
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return 0;
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nla_put_failure:
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return -EMSGSIZE;
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}
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static int nh_fill_node(struct sk_buff *skb, struct nexthop *nh,
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int event, u32 portid, u32 seq, unsigned int nlflags)
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{
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struct fib6_nh *fib6_nh;
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struct fib_nh *fib_nh;
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struct nlmsghdr *nlh;
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struct nh_info *nhi;
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struct nhmsg *nhm;
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nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nhm), nlflags);
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if (!nlh)
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return -EMSGSIZE;
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nhm = nlmsg_data(nlh);
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nhm->nh_family = AF_UNSPEC;
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nhm->nh_flags = nh->nh_flags;
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nhm->nh_protocol = nh->protocol;
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nhm->nh_scope = 0;
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nhm->resvd = 0;
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if (nla_put_u32(skb, NHA_ID, nh->id))
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goto nla_put_failure;
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if (nh->is_group) {
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struct nh_group *nhg = rtnl_dereference(nh->nh_grp);
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if (nhg->fdb_nh && nla_put_flag(skb, NHA_FDB))
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goto nla_put_failure;
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if (nla_put_nh_group(skb, nhg))
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goto nla_put_failure;
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goto out;
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}
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nhi = rtnl_dereference(nh->nh_info);
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nhm->nh_family = nhi->family;
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if (nhi->reject_nh) {
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if (nla_put_flag(skb, NHA_BLACKHOLE))
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goto nla_put_failure;
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goto out;
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} else if (nhi->fdb_nh) {
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if (nla_put_flag(skb, NHA_FDB))
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goto nla_put_failure;
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} else {
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const struct net_device *dev;
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dev = nhi->fib_nhc.nhc_dev;
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if (dev && nla_put_u32(skb, NHA_OIF, dev->ifindex))
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goto nla_put_failure;
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}
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nhm->nh_scope = nhi->fib_nhc.nhc_scope;
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switch (nhi->family) {
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case AF_INET:
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fib_nh = &nhi->fib_nh;
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if (fib_nh->fib_nh_gw_family &&
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nla_put_be32(skb, NHA_GATEWAY, fib_nh->fib_nh_gw4))
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goto nla_put_failure;
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break;
|
|
|
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case AF_INET6:
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fib6_nh = &nhi->fib6_nh;
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if (fib6_nh->fib_nh_gw_family &&
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nla_put_in6_addr(skb, NHA_GATEWAY, &fib6_nh->fib_nh_gw6))
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goto nla_put_failure;
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break;
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}
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|
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if (nhi->fib_nhc.nhc_lwtstate &&
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lwtunnel_fill_encap(skb, nhi->fib_nhc.nhc_lwtstate,
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NHA_ENCAP, NHA_ENCAP_TYPE) < 0)
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goto nla_put_failure;
|
|
|
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out:
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nlmsg_end(skb, nlh);
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return 0;
|
|
|
|
nla_put_failure:
|
|
nlmsg_cancel(skb, nlh);
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return -EMSGSIZE;
|
|
}
|
|
|
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static size_t nh_nlmsg_size_grp(struct nexthop *nh)
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{
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struct nh_group *nhg = rtnl_dereference(nh->nh_grp);
|
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size_t sz = sizeof(struct nexthop_grp) * nhg->num_nh;
|
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|
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return nla_total_size(sz) +
|
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nla_total_size(2); /* NHA_GROUP_TYPE */
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}
|
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|
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static size_t nh_nlmsg_size_single(struct nexthop *nh)
|
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{
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struct nh_info *nhi = rtnl_dereference(nh->nh_info);
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size_t sz;
|
|
|
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/* covers NHA_BLACKHOLE since NHA_OIF and BLACKHOLE
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* are mutually exclusive
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*/
|
|
sz = nla_total_size(4); /* NHA_OIF */
|
|
|
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switch (nhi->family) {
|
|
case AF_INET:
|
|
if (nhi->fib_nh.fib_nh_gw_family)
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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;
|
|
}
|
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|
|
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 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);
|
|
|
|
/* nested multipath (group within a group) is not
|
|
* supported
|
|
*/
|
|
if (nhg->mpath) {
|
|
NL_SET_ERR_MSG(extack,
|
|
"Multipath 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,
|
|
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;
|
|
if (i == NHA_FDB)
|
|
continue;
|
|
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_mp(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->mpath.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;
|
|
}
|
|
|
|
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->mpath)
|
|
return nexthop_select_path_mp(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 void nh_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->mpath.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->mpath = nhg->mpath;
|
|
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++;
|
|
}
|
|
|
|
nh_group_rebalance(newg);
|
|
rcu_assign_pointer(nhp->nh_grp, newg);
|
|
|
|
list_del(&nhge->nh_list);
|
|
nexthop_put(nhge->nh);
|
|
|
|
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);
|
|
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);
|
|
}
|
|
}
|
|
|
|
/* 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,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
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;
|
|
}
|
|
|
|
err = call_nexthop_notifiers(net, NEXTHOP_EVENT_REPLACE, new, extack);
|
|
if (err)
|
|
return err;
|
|
|
|
oldg = rtnl_dereference(old->nh_grp);
|
|
newg = rtnl_dereference(new->nh_grp);
|
|
|
|
/* 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);
|
|
|
|
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(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 = call_nexthop_notifiers(net, NEXTHOP_EVENT_REPLACE, nhp,
|
|
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;
|
|
|
|
call_nexthop_notifiers(net, NEXTHOP_EVENT_REPLACE, nhp, extack);
|
|
}
|
|
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, 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, 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, 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;
|
|
}
|
|
|
|
rb_link_node_rcu(&new_nh->rb_node, parent, pp);
|
|
rb_insert_color(&new_nh->rb_node, root);
|
|
|
|
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 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;
|
|
|
|
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 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))
|
|
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->mpath = 1;
|
|
|
|
WARN_ON_ONCE(nhg->mpath != 1);
|
|
|
|
if (nhg->mpath)
|
|
nh_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(-ENOENT);
|
|
}
|
|
|
|
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_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_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_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), 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(struct nlmsghdr *nlh, u32 *id,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
struct nhmsg *nhm = nlmsg_data(nlh);
|
|
struct nlattr *tb[ARRAY_SIZE(rtm_nh_policy_get)];
|
|
int err;
|
|
|
|
err = nlmsg_parse(nlh, sizeof(*nhm), tb,
|
|
ARRAY_SIZE(rtm_nh_policy_get) - 1,
|
|
rtm_nh_policy_get, extack);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
err = -EINVAL;
|
|
if (nhm->nh_protocol || nhm->resvd || nhm->nh_scope || nhm->nh_flags) {
|
|
NL_SET_ERR_MSG(extack, "Invalid values in header");
|
|
goto out;
|
|
}
|
|
|
|
if (!tb[NHA_ID]) {
|
|
NL_SET_ERR_MSG(extack, "Nexthop id is missing");
|
|
goto out;
|
|
}
|
|
|
|
*id = nla_get_u32(tb[NHA_ID]);
|
|
if (!(*id))
|
|
NL_SET_ERR_MSG(extack, "Invalid nexthop id");
|
|
else
|
|
err = 0;
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
/* 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(skb);
|
|
goto out;
|
|
}
|
|
|
|
struct nh_dump_filter {
|
|
int dev_idx;
|
|
int master_idx;
|
|
bool group_filter;
|
|
bool fdb_filter;
|
|
};
|
|
|
|
static bool nh_dump_filtered(struct nexthop *nh,
|
|
struct nh_dump_filter *filter, u8 family)
|
|
{
|
|
const struct net_device *dev;
|
|
const struct nh_info *nhi;
|
|
|
|
if (filter->group_filter && !nh->is_group)
|
|
return true;
|
|
|
|
if (!filter->dev_idx && !filter->master_idx && !family)
|
|
return false;
|
|
|
|
if (nh->is_group)
|
|
return true;
|
|
|
|
nhi = rtnl_dereference(nh->nh_info);
|
|
if (family && nhi->family != family)
|
|
return true;
|
|
|
|
dev = nhi->fib_nhc.nhc_dev;
|
|
if (filter->dev_idx && (!dev || dev->ifindex != filter->dev_idx))
|
|
return true;
|
|
|
|
if (filter->master_idx) {
|
|
struct net_device *master;
|
|
|
|
if (!dev)
|
|
return true;
|
|
|
|
master = netdev_master_upper_dev_get((struct net_device *)dev);
|
|
if (!master || master->ifindex != filter->master_idx)
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
static int __nh_valid_dump_req(const struct nlmsghdr *nlh, struct nlattr **tb,
|
|
struct nh_dump_filter *filter,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
struct nhmsg *nhm;
|
|
u32 idx;
|
|
|
|
if (tb[NHA_OIF]) {
|
|
idx = nla_get_u32(tb[NHA_OIF]);
|
|
if (idx > INT_MAX) {
|
|
NL_SET_ERR_MSG(extack, "Invalid device index");
|
|
return -EINVAL;
|
|
}
|
|
filter->dev_idx = idx;
|
|
}
|
|
if (tb[NHA_MASTER]) {
|
|
idx = nla_get_u32(tb[NHA_MASTER]);
|
|
if (idx > INT_MAX) {
|
|
NL_SET_ERR_MSG(extack, "Invalid master device index");
|
|
return -EINVAL;
|
|
}
|
|
filter->master_idx = idx;
|
|
}
|
|
filter->group_filter = nla_get_flag(tb[NHA_GROUPS]);
|
|
filter->fdb_filter = nla_get_flag(tb[NHA_FDB]);
|
|
|
|
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 for nexthop dump request");
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int nh_valid_dump_req(const struct nlmsghdr *nlh,
|
|
struct nh_dump_filter *filter,
|
|
struct netlink_callback *cb)
|
|
{
|
|
struct nlattr *tb[ARRAY_SIZE(rtm_nh_policy_dump)];
|
|
int err;
|
|
|
|
err = nlmsg_parse(nlh, sizeof(struct nhmsg), tb,
|
|
ARRAY_SIZE(rtm_nh_policy_dump) - 1,
|
|
rtm_nh_policy_dump, cb->extack);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
return __nh_valid_dump_req(nlh, tb, filter, cb->extack);
|
|
}
|
|
|
|
struct rtm_dump_nh_ctx {
|
|
u32 idx;
|
|
};
|
|
|
|
static struct rtm_dump_nh_ctx *
|
|
rtm_dump_nh_ctx(struct netlink_callback *cb)
|
|
{
|
|
struct rtm_dump_nh_ctx *ctx = (void *)cb->ctx;
|
|
|
|
BUILD_BUG_ON(sizeof(*ctx) > sizeof(cb->ctx));
|
|
return ctx;
|
|
}
|
|
|
|
static int rtm_dump_walk_nexthops(struct sk_buff *skb,
|
|
struct netlink_callback *cb,
|
|
struct rb_root *root,
|
|
struct rtm_dump_nh_ctx *ctx,
|
|
int (*nh_cb)(struct sk_buff *skb,
|
|
struct netlink_callback *cb,
|
|
struct nexthop *nh, void *data),
|
|
void *data)
|
|
{
|
|
struct rb_node *node;
|
|
int idx = 0, s_idx;
|
|
int err;
|
|
|
|
s_idx = ctx->idx;
|
|
for (node = rb_first(root); node; node = rb_next(node)) {
|
|
struct nexthop *nh;
|
|
|
|
if (idx < s_idx)
|
|
goto cont;
|
|
|
|
nh = rb_entry(node, struct nexthop, rb_node);
|
|
ctx->idx = idx;
|
|
err = nh_cb(skb, cb, nh, data);
|
|
if (err)
|
|
return err;
|
|
cont:
|
|
idx++;
|
|
}
|
|
|
|
ctx->idx = idx;
|
|
return 0;
|
|
}
|
|
|
|
static int rtm_dump_nexthop_cb(struct sk_buff *skb, struct netlink_callback *cb,
|
|
struct nexthop *nh, void *data)
|
|
{
|
|
struct nhmsg *nhm = nlmsg_data(cb->nlh);
|
|
struct nh_dump_filter *filter = data;
|
|
|
|
if (nh_dump_filtered(nh, filter, nhm->nh_family))
|
|
return 0;
|
|
|
|
return nh_fill_node(skb, nh, RTM_NEWNEXTHOP,
|
|
NETLINK_CB(cb->skb).portid,
|
|
cb->nlh->nlmsg_seq, NLM_F_MULTI);
|
|
}
|
|
|
|
/* rtnl */
|
|
static int rtm_dump_nexthop(struct sk_buff *skb, struct netlink_callback *cb)
|
|
{
|
|
struct rtm_dump_nh_ctx *ctx = rtm_dump_nh_ctx(cb);
|
|
struct net *net = sock_net(skb->sk);
|
|
struct rb_root *root = &net->nexthop.rb_root;
|
|
struct nh_dump_filter filter = {};
|
|
int err;
|
|
|
|
err = nh_valid_dump_req(cb->nlh, &filter, cb);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
err = rtm_dump_walk_nexthops(skb, cb, root, ctx,
|
|
&rtm_dump_nexthop_cb, &filter);
|
|
if (err < 0) {
|
|
if (likely(skb->len))
|
|
goto out;
|
|
goto out_err;
|
|
}
|
|
|
|
out:
|
|
err = skb->len;
|
|
out_err:
|
|
cb->seq = net->nexthop.seq;
|
|
nl_dump_check_consistent(cb, nlmsg_hdr(skb));
|
|
return err;
|
|
}
|
|
|
|
static void nexthop_sync_mtu(struct net_device *dev, u32 orig_mtu)
|
|
{
|
|
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) {
|
|
if (nhi->family == AF_INET)
|
|
fib_nhc_update_mtu(&nhi->fib_nhc, dev->mtu,
|
|
orig_mtu);
|
|
}
|
|
}
|
|
}
|
|
|
|
/* rtnl */
|
|
static int nh_netdev_event(struct notifier_block *this,
|
|
unsigned long event, void *ptr)
|
|
{
|
|
struct net_device *dev = netdev_notifier_info_to_dev(ptr);
|
|
struct netdev_notifier_info_ext *info_ext;
|
|
|
|
switch (event) {
|
|
case NETDEV_DOWN:
|
|
case NETDEV_UNREGISTER:
|
|
nexthop_flush_dev(dev);
|
|
break;
|
|
case NETDEV_CHANGE:
|
|
if (!(dev_get_flags(dev) & (IFF_RUNNING | IFF_LOWER_UP)))
|
|
nexthop_flush_dev(dev);
|
|
break;
|
|
case NETDEV_CHANGEMTU:
|
|
info_ext = ptr;
|
|
nexthop_sync_mtu(dev, info_ext->ext.mtu);
|
|
rt_cache_flush(dev_net(dev));
|
|
break;
|
|
}
|
|
return NOTIFY_DONE;
|
|
}
|
|
|
|
static struct notifier_block nh_netdev_notifier = {
|
|
.notifier_call = nh_netdev_event,
|
|
};
|
|
|
|
static int nexthops_dump(struct net *net, struct notifier_block *nb,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
struct rb_root *root = &net->nexthop.rb_root;
|
|
struct rb_node *node;
|
|
int err = 0;
|
|
|
|
for (node = rb_first(root); node; node = rb_next(node)) {
|
|
struct nexthop *nh;
|
|
|
|
nh = rb_entry(node, struct nexthop, rb_node);
|
|
err = call_nexthop_notifier(nb, net, NEXTHOP_EVENT_REPLACE, nh,
|
|
extack);
|
|
if (err)
|
|
break;
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
int register_nexthop_notifier(struct net *net, struct notifier_block *nb,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
int err;
|
|
|
|
rtnl_lock();
|
|
err = nexthops_dump(net, nb, extack);
|
|
if (err)
|
|
goto unlock;
|
|
err = blocking_notifier_chain_register(&net->nexthop.notifier_chain,
|
|
nb);
|
|
unlock:
|
|
rtnl_unlock();
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(register_nexthop_notifier);
|
|
|
|
int unregister_nexthop_notifier(struct net *net, struct notifier_block *nb)
|
|
{
|
|
return blocking_notifier_chain_unregister(&net->nexthop.notifier_chain,
|
|
nb);
|
|
}
|
|
EXPORT_SYMBOL(unregister_nexthop_notifier);
|
|
|
|
void nexthop_set_hw_flags(struct net *net, u32 id, bool offload, bool trap)
|
|
{
|
|
struct nexthop *nexthop;
|
|
|
|
rcu_read_lock();
|
|
|
|
nexthop = nexthop_find_by_id(net, id);
|
|
if (!nexthop)
|
|
goto out;
|
|
|
|
nexthop->nh_flags &= ~(RTNH_F_OFFLOAD | RTNH_F_TRAP);
|
|
if (offload)
|
|
nexthop->nh_flags |= RTNH_F_OFFLOAD;
|
|
if (trap)
|
|
nexthop->nh_flags |= RTNH_F_TRAP;
|
|
|
|
out:
|
|
rcu_read_unlock();
|
|
}
|
|
EXPORT_SYMBOL(nexthop_set_hw_flags);
|
|
|
|
static void __net_exit nexthop_net_exit(struct net *net)
|
|
{
|
|
rtnl_lock();
|
|
flush_all_nexthops(net);
|
|
rtnl_unlock();
|
|
kfree(net->nexthop.devhash);
|
|
}
|
|
|
|
static int __net_init nexthop_net_init(struct net *net)
|
|
{
|
|
size_t sz = sizeof(struct hlist_head) * NH_DEV_HASHSIZE;
|
|
|
|
net->nexthop.rb_root = RB_ROOT;
|
|
net->nexthop.devhash = kzalloc(sz, GFP_KERNEL);
|
|
if (!net->nexthop.devhash)
|
|
return -ENOMEM;
|
|
BLOCKING_INIT_NOTIFIER_HEAD(&net->nexthop.notifier_chain);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct pernet_operations nexthop_net_ops = {
|
|
.init = nexthop_net_init,
|
|
.exit = nexthop_net_exit,
|
|
};
|
|
|
|
static int __init nexthop_init(void)
|
|
{
|
|
register_pernet_subsys(&nexthop_net_ops);
|
|
|
|
register_netdevice_notifier(&nh_netdev_notifier);
|
|
|
|
rtnl_register(PF_UNSPEC, RTM_NEWNEXTHOP, rtm_new_nexthop, NULL, 0);
|
|
rtnl_register(PF_UNSPEC, RTM_DELNEXTHOP, rtm_del_nexthop, NULL, 0);
|
|
rtnl_register(PF_UNSPEC, RTM_GETNEXTHOP, rtm_get_nexthop,
|
|
rtm_dump_nexthop, 0);
|
|
|
|
rtnl_register(PF_INET, RTM_NEWNEXTHOP, rtm_new_nexthop, NULL, 0);
|
|
rtnl_register(PF_INET, RTM_GETNEXTHOP, NULL, rtm_dump_nexthop, 0);
|
|
|
|
rtnl_register(PF_INET6, RTM_NEWNEXTHOP, rtm_new_nexthop, NULL, 0);
|
|
rtnl_register(PF_INET6, RTM_GETNEXTHOP, NULL, rtm_dump_nexthop, 0);
|
|
|
|
return 0;
|
|
}
|
|
subsys_initcall(nexthop_init);
|