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510 lines
12 KiB
510 lines
12 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* net/ipv6/fib6_rules.c IPv6 Routing Policy Rules |
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* |
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* Copyright (C)2003-2006 Helsinki University of Technology |
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* Copyright (C)2003-2006 USAGI/WIDE Project |
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* |
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* Authors |
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* Thomas Graf <[email protected]> |
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* Ville Nuorvala <[email protected]> |
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*/ |
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|
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#include <linux/netdevice.h> |
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#include <linux/notifier.h> |
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#include <linux/export.h> |
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#include <linux/indirect_call_wrapper.h> |
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|
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#include <net/fib_rules.h> |
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#include <net/ipv6.h> |
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#include <net/addrconf.h> |
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#include <net/ip6_route.h> |
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#include <net/netlink.h> |
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struct fib6_rule { |
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struct fib_rule common; |
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struct rt6key src; |
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struct rt6key dst; |
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u8 tclass; |
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}; |
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static bool fib6_rule_matchall(const struct fib_rule *rule) |
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{ |
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struct fib6_rule *r = container_of(rule, struct fib6_rule, common); |
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if (r->dst.plen || r->src.plen || r->tclass) |
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return false; |
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return fib_rule_matchall(rule); |
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} |
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bool fib6_rule_default(const struct fib_rule *rule) |
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{ |
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if (!fib6_rule_matchall(rule) || rule->action != FR_ACT_TO_TBL || |
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rule->l3mdev) |
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return false; |
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if (rule->table != RT6_TABLE_LOCAL && rule->table != RT6_TABLE_MAIN) |
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return false; |
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return true; |
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} |
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EXPORT_SYMBOL_GPL(fib6_rule_default); |
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int fib6_rules_dump(struct net *net, struct notifier_block *nb, |
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struct netlink_ext_ack *extack) |
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{ |
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return fib_rules_dump(net, nb, AF_INET6, extack); |
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} |
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unsigned int fib6_rules_seq_read(struct net *net) |
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{ |
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return fib_rules_seq_read(net, AF_INET6); |
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} |
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/* called with rcu lock held; no reference taken on fib6_info */ |
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int fib6_lookup(struct net *net, int oif, struct flowi6 *fl6, |
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struct fib6_result *res, int flags) |
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{ |
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int err; |
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if (net->ipv6.fib6_has_custom_rules) { |
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struct fib_lookup_arg arg = { |
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.lookup_ptr = fib6_table_lookup, |
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.lookup_data = &oif, |
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.result = res, |
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.flags = FIB_LOOKUP_NOREF, |
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}; |
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l3mdev_update_flow(net, flowi6_to_flowi(fl6)); |
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err = fib_rules_lookup(net->ipv6.fib6_rules_ops, |
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flowi6_to_flowi(fl6), flags, &arg); |
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} else { |
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err = fib6_table_lookup(net, net->ipv6.fib6_local_tbl, oif, |
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fl6, res, flags); |
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if (err || res->f6i == net->ipv6.fib6_null_entry) |
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err = fib6_table_lookup(net, net->ipv6.fib6_main_tbl, |
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oif, fl6, res, flags); |
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} |
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return err; |
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} |
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struct dst_entry *fib6_rule_lookup(struct net *net, struct flowi6 *fl6, |
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const struct sk_buff *skb, |
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int flags, pol_lookup_t lookup) |
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{ |
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if (net->ipv6.fib6_has_custom_rules) { |
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struct fib6_result res = {}; |
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struct fib_lookup_arg arg = { |
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.lookup_ptr = lookup, |
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.lookup_data = skb, |
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.result = &res, |
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.flags = FIB_LOOKUP_NOREF, |
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}; |
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/* update flow if oif or iif point to device enslaved to l3mdev */ |
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l3mdev_update_flow(net, flowi6_to_flowi(fl6)); |
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fib_rules_lookup(net->ipv6.fib6_rules_ops, |
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flowi6_to_flowi(fl6), flags, &arg); |
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if (res.rt6) |
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return &res.rt6->dst; |
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} else { |
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struct rt6_info *rt; |
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rt = pol_lookup_func(lookup, |
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net, net->ipv6.fib6_local_tbl, fl6, skb, flags); |
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if (rt != net->ipv6.ip6_null_entry && rt->dst.error != -EAGAIN) |
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return &rt->dst; |
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ip6_rt_put_flags(rt, flags); |
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rt = pol_lookup_func(lookup, |
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net, net->ipv6.fib6_main_tbl, fl6, skb, flags); |
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if (rt->dst.error != -EAGAIN) |
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return &rt->dst; |
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ip6_rt_put_flags(rt, flags); |
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} |
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if (!(flags & RT6_LOOKUP_F_DST_NOREF)) |
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dst_hold(&net->ipv6.ip6_null_entry->dst); |
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return &net->ipv6.ip6_null_entry->dst; |
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} |
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static int fib6_rule_saddr(struct net *net, struct fib_rule *rule, int flags, |
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struct flowi6 *flp6, const struct net_device *dev) |
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{ |
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struct fib6_rule *r = (struct fib6_rule *)rule; |
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/* If we need to find a source address for this traffic, |
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* we check the result if it meets requirement of the rule. |
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*/ |
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if ((rule->flags & FIB_RULE_FIND_SADDR) && |
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r->src.plen && !(flags & RT6_LOOKUP_F_HAS_SADDR)) { |
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struct in6_addr saddr; |
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if (ipv6_dev_get_saddr(net, dev, &flp6->daddr, |
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rt6_flags2srcprefs(flags), &saddr)) |
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return -EAGAIN; |
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if (!ipv6_prefix_equal(&saddr, &r->src.addr, r->src.plen)) |
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return -EAGAIN; |
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flp6->saddr = saddr; |
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} |
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return 0; |
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} |
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static int fib6_rule_action_alt(struct fib_rule *rule, struct flowi *flp, |
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int flags, struct fib_lookup_arg *arg) |
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{ |
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struct fib6_result *res = arg->result; |
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struct flowi6 *flp6 = &flp->u.ip6; |
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struct net *net = rule->fr_net; |
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struct fib6_table *table; |
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int err, *oif; |
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u32 tb_id; |
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switch (rule->action) { |
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case FR_ACT_TO_TBL: |
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break; |
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case FR_ACT_UNREACHABLE: |
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return -ENETUNREACH; |
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case FR_ACT_PROHIBIT: |
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return -EACCES; |
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case FR_ACT_BLACKHOLE: |
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default: |
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return -EINVAL; |
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} |
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tb_id = fib_rule_get_table(rule, arg); |
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table = fib6_get_table(net, tb_id); |
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if (!table) |
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return -EAGAIN; |
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oif = (int *)arg->lookup_data; |
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err = fib6_table_lookup(net, table, *oif, flp6, res, flags); |
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if (!err && res->f6i != net->ipv6.fib6_null_entry) |
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err = fib6_rule_saddr(net, rule, flags, flp6, |
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res->nh->fib_nh_dev); |
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else |
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err = -EAGAIN; |
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return err; |
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} |
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static int __fib6_rule_action(struct fib_rule *rule, struct flowi *flp, |
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int flags, struct fib_lookup_arg *arg) |
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{ |
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struct fib6_result *res = arg->result; |
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struct flowi6 *flp6 = &flp->u.ip6; |
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struct rt6_info *rt = NULL; |
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struct fib6_table *table; |
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struct net *net = rule->fr_net; |
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pol_lookup_t lookup = arg->lookup_ptr; |
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int err = 0; |
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u32 tb_id; |
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switch (rule->action) { |
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case FR_ACT_TO_TBL: |
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break; |
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case FR_ACT_UNREACHABLE: |
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err = -ENETUNREACH; |
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rt = net->ipv6.ip6_null_entry; |
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goto discard_pkt; |
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default: |
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case FR_ACT_BLACKHOLE: |
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err = -EINVAL; |
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rt = net->ipv6.ip6_blk_hole_entry; |
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goto discard_pkt; |
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case FR_ACT_PROHIBIT: |
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err = -EACCES; |
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rt = net->ipv6.ip6_prohibit_entry; |
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goto discard_pkt; |
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} |
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tb_id = fib_rule_get_table(rule, arg); |
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table = fib6_get_table(net, tb_id); |
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if (!table) { |
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err = -EAGAIN; |
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goto out; |
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} |
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rt = pol_lookup_func(lookup, |
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net, table, flp6, arg->lookup_data, flags); |
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if (rt != net->ipv6.ip6_null_entry) { |
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err = fib6_rule_saddr(net, rule, flags, flp6, |
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ip6_dst_idev(&rt->dst)->dev); |
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if (err == -EAGAIN) |
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goto again; |
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err = rt->dst.error; |
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if (err != -EAGAIN) |
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goto out; |
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} |
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again: |
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ip6_rt_put_flags(rt, flags); |
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err = -EAGAIN; |
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rt = NULL; |
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goto out; |
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discard_pkt: |
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if (!(flags & RT6_LOOKUP_F_DST_NOREF)) |
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dst_hold(&rt->dst); |
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out: |
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res->rt6 = rt; |
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return err; |
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} |
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INDIRECT_CALLABLE_SCOPE int fib6_rule_action(struct fib_rule *rule, |
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struct flowi *flp, int flags, |
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struct fib_lookup_arg *arg) |
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{ |
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if (arg->lookup_ptr == fib6_table_lookup) |
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return fib6_rule_action_alt(rule, flp, flags, arg); |
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return __fib6_rule_action(rule, flp, flags, arg); |
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} |
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INDIRECT_CALLABLE_SCOPE bool fib6_rule_suppress(struct fib_rule *rule, |
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int flags, |
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struct fib_lookup_arg *arg) |
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{ |
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struct fib6_result *res = arg->result; |
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struct rt6_info *rt = res->rt6; |
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struct net_device *dev = NULL; |
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if (!rt) |
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return false; |
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if (rt->rt6i_idev) |
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dev = rt->rt6i_idev->dev; |
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/* do not accept result if the route does |
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* not meet the required prefix length |
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*/ |
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if (rt->rt6i_dst.plen <= rule->suppress_prefixlen) |
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goto suppress_route; |
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/* do not accept result if the route uses a device |
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* belonging to a forbidden interface group |
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*/ |
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if (rule->suppress_ifgroup != -1 && dev && dev->group == rule->suppress_ifgroup) |
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goto suppress_route; |
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return false; |
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suppress_route: |
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ip6_rt_put_flags(rt, flags); |
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return true; |
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} |
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INDIRECT_CALLABLE_SCOPE int fib6_rule_match(struct fib_rule *rule, |
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struct flowi *fl, int flags) |
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{ |
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struct fib6_rule *r = (struct fib6_rule *) rule; |
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struct flowi6 *fl6 = &fl->u.ip6; |
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if (r->dst.plen && |
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!ipv6_prefix_equal(&fl6->daddr, &r->dst.addr, r->dst.plen)) |
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return 0; |
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/* |
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* If FIB_RULE_FIND_SADDR is set and we do not have a |
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* source address for the traffic, we defer check for |
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* source address. |
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*/ |
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if (r->src.plen) { |
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if (flags & RT6_LOOKUP_F_HAS_SADDR) { |
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if (!ipv6_prefix_equal(&fl6->saddr, &r->src.addr, |
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r->src.plen)) |
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return 0; |
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} else if (!(r->common.flags & FIB_RULE_FIND_SADDR)) |
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return 0; |
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} |
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if (r->tclass && r->tclass != ip6_tclass(fl6->flowlabel)) |
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return 0; |
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if (rule->ip_proto && (rule->ip_proto != fl6->flowi6_proto)) |
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return 0; |
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if (fib_rule_port_range_set(&rule->sport_range) && |
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!fib_rule_port_inrange(&rule->sport_range, fl6->fl6_sport)) |
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return 0; |
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if (fib_rule_port_range_set(&rule->dport_range) && |
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!fib_rule_port_inrange(&rule->dport_range, fl6->fl6_dport)) |
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return 0; |
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return 1; |
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} |
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static int fib6_rule_configure(struct fib_rule *rule, struct sk_buff *skb, |
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struct fib_rule_hdr *frh, |
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struct nlattr **tb, |
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struct netlink_ext_ack *extack) |
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{ |
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int err = -EINVAL; |
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struct net *net = sock_net(skb->sk); |
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struct fib6_rule *rule6 = (struct fib6_rule *) rule; |
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if (rule->action == FR_ACT_TO_TBL && !rule->l3mdev) { |
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if (rule->table == RT6_TABLE_UNSPEC) { |
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NL_SET_ERR_MSG(extack, "Invalid table"); |
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goto errout; |
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} |
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if (fib6_new_table(net, rule->table) == NULL) { |
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err = -ENOBUFS; |
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goto errout; |
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} |
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} |
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if (frh->src_len) |
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rule6->src.addr = nla_get_in6_addr(tb[FRA_SRC]); |
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if (frh->dst_len) |
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rule6->dst.addr = nla_get_in6_addr(tb[FRA_DST]); |
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rule6->src.plen = frh->src_len; |
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rule6->dst.plen = frh->dst_len; |
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rule6->tclass = frh->tos; |
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if (fib_rule_requires_fldissect(rule)) |
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net->ipv6.fib6_rules_require_fldissect++; |
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net->ipv6.fib6_has_custom_rules = true; |
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err = 0; |
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errout: |
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return err; |
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} |
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static int fib6_rule_delete(struct fib_rule *rule) |
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{ |
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struct net *net = rule->fr_net; |
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if (net->ipv6.fib6_rules_require_fldissect && |
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fib_rule_requires_fldissect(rule)) |
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net->ipv6.fib6_rules_require_fldissect--; |
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return 0; |
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} |
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static int fib6_rule_compare(struct fib_rule *rule, struct fib_rule_hdr *frh, |
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struct nlattr **tb) |
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{ |
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struct fib6_rule *rule6 = (struct fib6_rule *) rule; |
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if (frh->src_len && (rule6->src.plen != frh->src_len)) |
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return 0; |
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if (frh->dst_len && (rule6->dst.plen != frh->dst_len)) |
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return 0; |
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if (frh->tos && (rule6->tclass != frh->tos)) |
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return 0; |
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if (frh->src_len && |
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nla_memcmp(tb[FRA_SRC], &rule6->src.addr, sizeof(struct in6_addr))) |
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return 0; |
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if (frh->dst_len && |
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nla_memcmp(tb[FRA_DST], &rule6->dst.addr, sizeof(struct in6_addr))) |
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return 0; |
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return 1; |
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} |
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static int fib6_rule_fill(struct fib_rule *rule, struct sk_buff *skb, |
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struct fib_rule_hdr *frh) |
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{ |
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struct fib6_rule *rule6 = (struct fib6_rule *) rule; |
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frh->dst_len = rule6->dst.plen; |
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frh->src_len = rule6->src.plen; |
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frh->tos = rule6->tclass; |
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if ((rule6->dst.plen && |
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nla_put_in6_addr(skb, FRA_DST, &rule6->dst.addr)) || |
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(rule6->src.plen && |
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nla_put_in6_addr(skb, FRA_SRC, &rule6->src.addr))) |
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goto nla_put_failure; |
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return 0; |
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nla_put_failure: |
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return -ENOBUFS; |
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} |
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static size_t fib6_rule_nlmsg_payload(struct fib_rule *rule) |
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{ |
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return nla_total_size(16) /* dst */ |
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+ nla_total_size(16); /* src */ |
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} |
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static const struct fib_rules_ops __net_initconst fib6_rules_ops_template = { |
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.family = AF_INET6, |
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.rule_size = sizeof(struct fib6_rule), |
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.addr_size = sizeof(struct in6_addr), |
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.action = fib6_rule_action, |
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.match = fib6_rule_match, |
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.suppress = fib6_rule_suppress, |
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.configure = fib6_rule_configure, |
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.delete = fib6_rule_delete, |
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.compare = fib6_rule_compare, |
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.fill = fib6_rule_fill, |
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.nlmsg_payload = fib6_rule_nlmsg_payload, |
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.nlgroup = RTNLGRP_IPV6_RULE, |
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.owner = THIS_MODULE, |
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.fro_net = &init_net, |
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}; |
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static int __net_init fib6_rules_net_init(struct net *net) |
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{ |
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struct fib_rules_ops *ops; |
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int err; |
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ops = fib_rules_register(&fib6_rules_ops_template, net); |
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if (IS_ERR(ops)) |
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return PTR_ERR(ops); |
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err = fib_default_rule_add(ops, 0, RT6_TABLE_LOCAL, 0); |
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if (err) |
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goto out_fib6_rules_ops; |
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err = fib_default_rule_add(ops, 0x7FFE, RT6_TABLE_MAIN, 0); |
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if (err) |
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goto out_fib6_rules_ops; |
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net->ipv6.fib6_rules_ops = ops; |
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net->ipv6.fib6_rules_require_fldissect = 0; |
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out: |
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return err; |
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out_fib6_rules_ops: |
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fib_rules_unregister(ops); |
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goto out; |
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} |
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static void __net_exit fib6_rules_net_exit(struct net *net) |
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{ |
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rtnl_lock(); |
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fib_rules_unregister(net->ipv6.fib6_rules_ops); |
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rtnl_unlock(); |
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} |
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static struct pernet_operations fib6_rules_net_ops = { |
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.init = fib6_rules_net_init, |
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.exit = fib6_rules_net_exit, |
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}; |
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|
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int __init fib6_rules_init(void) |
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{ |
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return register_pernet_subsys(&fib6_rules_net_ops); |
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} |
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|
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void fib6_rules_cleanup(void) |
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{ |
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unregister_pernet_subsys(&fib6_rules_net_ops); |
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}
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