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author | Timothy Pearson <tpearson@raptorengineering.com> | 2017-08-23 14:45:25 -0500 |
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committer | Timothy Pearson <tpearson@raptorengineering.com> | 2017-08-23 14:45:25 -0500 |
commit | fcbb27b0ec6dcbc5a5108cb8fb19eae64593d204 (patch) | |
tree | 22962a4387943edc841c72a4e636a068c66d58fd /net/ipv6/fib6_rules.c | |
download | ast2050-linux-kernel-fcbb27b0ec6dcbc5a5108cb8fb19eae64593d204.zip ast2050-linux-kernel-fcbb27b0ec6dcbc5a5108cb8fb19eae64593d204.tar.gz |
Initial import of modified Linux 2.6.28 tree
Original upstream URL:
git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git | branch linux-2.6.28.y
Diffstat (limited to 'net/ipv6/fib6_rules.c')
-rw-r--r-- | net/ipv6/fib6_rules.c | 321 |
1 files changed, 321 insertions, 0 deletions
diff --git a/net/ipv6/fib6_rules.c b/net/ipv6/fib6_rules.c new file mode 100644 index 0000000..f5de3f9 --- /dev/null +++ b/net/ipv6/fib6_rules.c @@ -0,0 +1,321 @@ +/* + * 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/addrconf.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; +}; + +struct dst_entry *fib6_rule_lookup(struct net *net, struct flowi *fl, + int flags, pol_lookup_t lookup) +{ + struct fib_lookup_arg arg = { + .lookup_ptr = lookup, + }; + + fib_rules_lookup(net->ipv6.fib6_rules_ops, fl, flags, &arg); + if (arg.rule) + fib_rule_put(arg.rule); + + if (arg.result) + return arg.result; + + dst_hold(&net->ipv6.ip6_null_entry->u.dst); + return &net->ipv6.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; + struct net *net = rule->fr_net; + pol_lookup_t lookup = arg->lookup_ptr; + + switch (rule->action) { + case FR_ACT_TO_TBL: + break; + case FR_ACT_UNREACHABLE: + rt = net->ipv6.ip6_null_entry; + goto discard_pkt; + default: + case FR_ACT_BLACKHOLE: + rt = net->ipv6.ip6_blk_hole_entry; + goto discard_pkt; + case FR_ACT_PROHIBIT: + rt = net->ipv6.ip6_prohibit_entry; + goto discard_pkt; + } + + table = fib6_get_table(net, rule->table); + if (table) + rt = lookup(net, table, flp, flags); + + if (rt != net->ipv6.ip6_null_entry) { + struct fib6_rule *r = (struct fib6_rule *)rule; + + /* + * If we need to find a source address for this traffic, + * we check the result if it meets requirement of the rule. + */ + if ((rule->flags & FIB_RULE_FIND_SADDR) && + r->src.plen && !(flags & RT6_LOOKUP_F_HAS_SADDR)) { + struct in6_addr saddr; + unsigned int srcprefs = 0; + + if (flags & RT6_LOOKUP_F_SRCPREF_TMP) + srcprefs |= IPV6_PREFER_SRC_TMP; + if (flags & RT6_LOOKUP_F_SRCPREF_PUBLIC) + srcprefs |= IPV6_PREFER_SRC_PUBLIC; + if (flags & RT6_LOOKUP_F_SRCPREF_COA) + srcprefs |= IPV6_PREFER_SRC_COA; + + if (ipv6_dev_get_saddr(net, + ip6_dst_idev(&rt->u.dst)->dev, + &flp->fl6_dst, srcprefs, + &saddr)) + goto again; + if (!ipv6_prefix_equal(&saddr, &r->src.addr, + r->src.plen)) + goto again; + ipv6_addr_copy(&flp->fl6_src, &saddr); + } + goto out; + } +again: + 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 FIB_RULE_FIND_SADDR is set and we do not have a + * source address for the traffic, we defer check for + * source address. + */ + if (r->src.plen) { + if (flags & RT6_LOOKUP_F_HAS_SADDR) { + if (!ipv6_prefix_equal(&fl->fl6_src, &r->src.addr, + r->src.plen)) + return 0; + } else if (!(r->common.flags & FIB_RULE_FIND_SADDR)) + return 0; + } + + if (r->tclass && r->tclass != ((ntohl(fl->fl6_flowlabel) >> 20) & 0xff)) + return 0; + + return 1; +} + +static const struct nla_policy fib6_rule_policy[FRA_MAX+1] = { + 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 net *net = sock_net(skb->sk); + 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(net, 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(struct fib_rules_ops *ops) +{ + 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_template = { + .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, + .owner = THIS_MODULE, + .fro_net = &init_net, +}; + +static int fib6_rules_net_init(struct net *net) +{ + int err = -ENOMEM; + + net->ipv6.fib6_rules_ops = kmemdup(&fib6_rules_ops_template, + sizeof(*net->ipv6.fib6_rules_ops), + GFP_KERNEL); + if (!net->ipv6.fib6_rules_ops) + goto out; + + net->ipv6.fib6_rules_ops->fro_net = net; + INIT_LIST_HEAD(&net->ipv6.fib6_rules_ops->rules_list); + + err = fib_default_rule_add(net->ipv6.fib6_rules_ops, 0, + RT6_TABLE_LOCAL, FIB_RULE_PERMANENT); + if (err) + goto out_fib6_rules_ops; + + err = fib_default_rule_add(net->ipv6.fib6_rules_ops, + 0x7FFE, RT6_TABLE_MAIN, 0); + if (err) + goto out_fib6_default_rule_add; + + err = fib_rules_register(net->ipv6.fib6_rules_ops); + if (err) + goto out_fib6_default_rule_add; +out: + return err; + +out_fib6_default_rule_add: + fib_rules_cleanup_ops(net->ipv6.fib6_rules_ops); +out_fib6_rules_ops: + kfree(net->ipv6.fib6_rules_ops); + goto out; +} + +static void fib6_rules_net_exit(struct net *net) +{ + fib_rules_unregister(net->ipv6.fib6_rules_ops); + kfree(net->ipv6.fib6_rules_ops); +} + +static struct pernet_operations fib6_rules_net_ops = { + .init = fib6_rules_net_init, + .exit = fib6_rules_net_exit, +}; + +int __init fib6_rules_init(void) +{ + return register_pernet_subsys(&fib6_rules_net_ops); +} + + +void fib6_rules_cleanup(void) +{ + unregister_pernet_subsys(&fib6_rules_net_ops); +} |