| /* |
| * net/ipv6/fib6_rules.c IPv6 Routing Policy Rules |
| * |
| * Copyright (C)2003-2006 Helsinki University of Technology |
| * Copyright (C)2003-2006 USAGI/WIDE Project |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License as |
| * published by the Free Software Foundation, version 2. |
| * |
| * Authors |
| * Thomas Graf <tgraf@suug.ch> |
| * Ville Nuorvala <vnuorval@tcs.hut.fi> |
| */ |
| |
| #include <linux/netdevice.h> |
| |
| #include <net/fib_rules.h> |
| #include <net/ipv6.h> |
| #include <net/ip6_route.h> |
| #include <net/netlink.h> |
| |
| struct fib6_rule |
| { |
| struct fib_rule common; |
| struct rt6key src; |
| struct rt6key dst; |
| u8 tclass; |
| }; |
| |
| static struct fib_rules_ops fib6_rules_ops; |
| |
| static struct fib6_rule main_rule = { |
| .common = { |
| .refcnt = ATOMIC_INIT(2), |
| .pref = 0x7FFE, |
| .action = FR_ACT_TO_TBL, |
| .table = RT6_TABLE_MAIN, |
| }, |
| }; |
| |
| static struct fib6_rule local_rule = { |
| .common = { |
| .refcnt = ATOMIC_INIT(2), |
| .pref = 0, |
| .action = FR_ACT_TO_TBL, |
| .table = RT6_TABLE_LOCAL, |
| .flags = FIB_RULE_PERMANENT, |
| }, |
| }; |
| |
| static LIST_HEAD(fib6_rules); |
| |
| struct dst_entry *fib6_rule_lookup(struct flowi *fl, int flags, |
| pol_lookup_t lookup) |
| { |
| struct fib_lookup_arg arg = { |
| .lookup_ptr = lookup, |
| }; |
| |
| fib_rules_lookup(&fib6_rules_ops, fl, flags, &arg); |
| if (arg.rule) |
| fib_rule_put(arg.rule); |
| |
| if (arg.result) |
| return arg.result; |
| |
| dst_hold(&ip6_null_entry.u.dst); |
| return &ip6_null_entry.u.dst; |
| } |
| |
| static int fib6_rule_action(struct fib_rule *rule, struct flowi *flp, |
| int flags, struct fib_lookup_arg *arg) |
| { |
| struct rt6_info *rt = NULL; |
| struct fib6_table *table; |
| pol_lookup_t lookup = arg->lookup_ptr; |
| |
| switch (rule->action) { |
| case FR_ACT_TO_TBL: |
| break; |
| case FR_ACT_UNREACHABLE: |
| rt = &ip6_null_entry; |
| goto discard_pkt; |
| default: |
| case FR_ACT_BLACKHOLE: |
| rt = &ip6_blk_hole_entry; |
| goto discard_pkt; |
| case FR_ACT_PROHIBIT: |
| rt = &ip6_prohibit_entry; |
| goto discard_pkt; |
| } |
| |
| table = fib6_get_table(rule->table); |
| if (table) |
| rt = lookup(table, flp, flags); |
| |
| if (rt != &ip6_null_entry) |
| goto out; |
| dst_release(&rt->u.dst); |
| rt = NULL; |
| goto out; |
| |
| discard_pkt: |
| dst_hold(&rt->u.dst); |
| out: |
| arg->result = rt; |
| return rt == NULL ? -EAGAIN : 0; |
| } |
| |
| |
| static int fib6_rule_match(struct fib_rule *rule, struct flowi *fl, int flags) |
| { |
| struct fib6_rule *r = (struct fib6_rule *) rule; |
| |
| if (r->dst.plen && |
| !ipv6_prefix_equal(&fl->fl6_dst, &r->dst.addr, r->dst.plen)) |
| return 0; |
| |
| if (r->src.plen) { |
| if (!(flags & RT6_LOOKUP_F_HAS_SADDR) || |
| !ipv6_prefix_equal(&fl->fl6_src, &r->src.addr, r->src.plen)) |
| return 0; |
| } |
| |
| if (r->tclass && r->tclass != ((ntohl(fl->fl6_flowlabel) >> 20) & 0xff)) |
| return 0; |
| |
| return 1; |
| } |
| |
| static struct nla_policy fib6_rule_policy[FRA_MAX+1] __read_mostly = { |
| FRA_GENERIC_POLICY, |
| }; |
| |
| static int fib6_rule_configure(struct fib_rule *rule, struct sk_buff *skb, |
| struct nlmsghdr *nlh, struct fib_rule_hdr *frh, |
| struct nlattr **tb) |
| { |
| int err = -EINVAL; |
| struct fib6_rule *rule6 = (struct fib6_rule *) rule; |
| |
| if (rule->action == FR_ACT_TO_TBL) { |
| if (rule->table == RT6_TABLE_UNSPEC) |
| goto errout; |
| |
| if (fib6_new_table(rule->table) == NULL) { |
| err = -ENOBUFS; |
| goto errout; |
| } |
| } |
| |
| if (frh->src_len) |
| nla_memcpy(&rule6->src.addr, tb[FRA_SRC], |
| sizeof(struct in6_addr)); |
| |
| if (frh->dst_len) |
| nla_memcpy(&rule6->dst.addr, tb[FRA_DST], |
| sizeof(struct in6_addr)); |
| |
| rule6->src.plen = frh->src_len; |
| rule6->dst.plen = frh->dst_len; |
| rule6->tclass = frh->tos; |
| |
| err = 0; |
| errout: |
| return err; |
| } |
| |
| static int fib6_rule_compare(struct fib_rule *rule, struct fib_rule_hdr *frh, |
| struct nlattr **tb) |
| { |
| struct fib6_rule *rule6 = (struct fib6_rule *) rule; |
| |
| if (frh->src_len && (rule6->src.plen != frh->src_len)) |
| return 0; |
| |
| if (frh->dst_len && (rule6->dst.plen != frh->dst_len)) |
| return 0; |
| |
| if (frh->tos && (rule6->tclass != frh->tos)) |
| return 0; |
| |
| if (frh->src_len && |
| nla_memcmp(tb[FRA_SRC], &rule6->src.addr, sizeof(struct in6_addr))) |
| return 0; |
| |
| if (frh->dst_len && |
| nla_memcmp(tb[FRA_DST], &rule6->dst.addr, sizeof(struct in6_addr))) |
| return 0; |
| |
| return 1; |
| } |
| |
| static int fib6_rule_fill(struct fib_rule *rule, struct sk_buff *skb, |
| struct nlmsghdr *nlh, struct fib_rule_hdr *frh) |
| { |
| struct fib6_rule *rule6 = (struct fib6_rule *) rule; |
| |
| frh->family = AF_INET6; |
| frh->dst_len = rule6->dst.plen; |
| frh->src_len = rule6->src.plen; |
| frh->tos = rule6->tclass; |
| |
| if (rule6->dst.plen) |
| NLA_PUT(skb, FRA_DST, sizeof(struct in6_addr), |
| &rule6->dst.addr); |
| |
| if (rule6->src.plen) |
| NLA_PUT(skb, FRA_SRC, sizeof(struct in6_addr), |
| &rule6->src.addr); |
| |
| return 0; |
| |
| nla_put_failure: |
| return -ENOBUFS; |
| } |
| |
| static u32 fib6_rule_default_pref(void) |
| { |
| return 0x3FFF; |
| } |
| |
| static size_t fib6_rule_nlmsg_payload(struct fib_rule *rule) |
| { |
| return nla_total_size(16) /* dst */ |
| + nla_total_size(16); /* src */ |
| } |
| |
| static struct fib_rules_ops fib6_rules_ops = { |
| .family = AF_INET6, |
| .rule_size = sizeof(struct fib6_rule), |
| .addr_size = sizeof(struct in6_addr), |
| .action = fib6_rule_action, |
| .match = fib6_rule_match, |
| .configure = fib6_rule_configure, |
| .compare = fib6_rule_compare, |
| .fill = fib6_rule_fill, |
| .default_pref = fib6_rule_default_pref, |
| .nlmsg_payload = fib6_rule_nlmsg_payload, |
| .nlgroup = RTNLGRP_IPV6_RULE, |
| .policy = fib6_rule_policy, |
| .rules_list = &fib6_rules, |
| .owner = THIS_MODULE, |
| }; |
| |
| void __init fib6_rules_init(void) |
| { |
| list_add_tail(&local_rule.common.list, &fib6_rules); |
| list_add_tail(&main_rule.common.list, &fib6_rules); |
| |
| fib_rules_register(&fib6_rules_ops); |
| } |
| |
| void fib6_rules_cleanup(void) |
| { |
| fib_rules_unregister(&fib6_rules_ops); |
| } |