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2325 lines
52 KiB
2325 lines
52 KiB
// 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 <[email protected]> |
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*/ |
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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__nh_notifier_single_info_init(info->nh, nh); |
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|
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return 0; |
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} |
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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return 0; |
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} |
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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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|
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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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|
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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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|
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if (nhg->mpath) |
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kfree(info->nh_grp); |
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} |
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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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|
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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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|
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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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|
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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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|
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if (nexthop_notifiers_is_empty(net)) |
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return 0; |
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|
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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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|
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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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|
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return notifier_to_errno(err); |
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} |
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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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|
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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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|
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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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|
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return notifier_to_errno(err); |
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} |
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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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|
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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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|
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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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|
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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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|
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WARN_ON(nhg->spare == nhg); |
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|
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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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|
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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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|
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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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|
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kfree(nh); |
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} |
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EXPORT_SYMBOL_GPL(nexthop_free_rcu); |
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|
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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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|
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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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|
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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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|
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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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|
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return nhg; |
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} |
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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; |
|
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); |
|
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; |
|
|
|
nla_put_failure: |
|
return -EMSGSIZE; |
|
} |
|
|
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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) |
|
{ |
|
struct fib6_nh *fib6_nh; |
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struct fib_nh *fib_nh; |
|
struct nlmsghdr *nlh; |
|
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); |
|
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(struct nexthop *nh) |
|
{ |
|
struct nh_group *nhg = rtnl_dereference(nh->nh_grp); |
|
size_t sz = sizeof(struct nexthop_grp) * nhg->num_nh; |
|
|
|
return nla_total_size(sz) + |
|
nla_total_size(2); /* NHA_GROUP_TYPE */ |
|
} |
|
|
|
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 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 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 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(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(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, event); |
|
break; |
|
case NETDEV_CHANGE: |
|
if (!(dev_get_flags(dev) & (IFF_RUNNING | IFF_LOWER_UP))) |
|
nexthop_flush_dev(dev, event); |
|
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) |
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{ |
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rtnl_lock(); |
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flush_all_nexthops(net); |
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rtnl_unlock(); |
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kfree(net->nexthop.devhash); |
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} |
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static int __net_init nexthop_net_init(struct net *net) |
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{ |
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size_t sz = sizeof(struct hlist_head) * NH_DEV_HASHSIZE; |
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net->nexthop.rb_root = RB_ROOT; |
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net->nexthop.devhash = kzalloc(sz, GFP_KERNEL); |
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if (!net->nexthop.devhash) |
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return -ENOMEM; |
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BLOCKING_INIT_NOTIFIER_HEAD(&net->nexthop.notifier_chain); |
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return 0; |
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} |
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static struct pernet_operations nexthop_net_ops = { |
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.init = nexthop_net_init, |
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.exit = nexthop_net_exit, |
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}; |
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static int __init nexthop_init(void) |
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{ |
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register_pernet_subsys(&nexthop_net_ops); |
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|
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register_netdevice_notifier(&nh_netdev_notifier); |
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rtnl_register(PF_UNSPEC, RTM_NEWNEXTHOP, rtm_new_nexthop, NULL, 0); |
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rtnl_register(PF_UNSPEC, RTM_DELNEXTHOP, rtm_del_nexthop, NULL, 0); |
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rtnl_register(PF_UNSPEC, RTM_GETNEXTHOP, rtm_get_nexthop, |
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rtm_dump_nexthop, 0); |
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rtnl_register(PF_INET, RTM_NEWNEXTHOP, rtm_new_nexthop, NULL, 0); |
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rtnl_register(PF_INET, RTM_GETNEXTHOP, NULL, rtm_dump_nexthop, 0); |
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rtnl_register(PF_INET6, RTM_NEWNEXTHOP, rtm_new_nexthop, NULL, 0); |
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rtnl_register(PF_INET6, RTM_GETNEXTHOP, NULL, rtm_dump_nexthop, 0); |
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return 0; |
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} |
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subsys_initcall(nexthop_init);
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