[IPV6]: Policy Routing Rules
Adds support for policy routing rules including a new
local table for routes with a local destination.
Signed-off-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv6/fib6_rules.c b/net/ipv6/fib6_rules.c
new file mode 100644
index 0000000..c3c8195
--- /dev/null
+++ b/net/ipv6/fib6_rules.c
@@ -0,0 +1,251 @@
+/*
+ * 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/config.h>
+#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);
+
+ return (struct dst_entry *) arg.result;
+}
+
+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);
+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 (!ipv6_prefix_equal(&fl->fl6_dst, &r->dst.addr, r->dst.plen))
+ return 0;
+
+ if ((flags & RT6_F_HAS_SADDR) &&
+ !ipv6_prefix_equal(&fl->fl6_src, &r->src.addr, r->src.plen))
+ return 0;
+
+ return 1;
+}
+
+static struct nla_policy fib6_rule_policy[RTA_MAX+1] __read_mostly = {
+ [FRA_IFNAME] = { .type = NLA_STRING },
+ [FRA_PRIORITY] = { .type = NLA_U32 },
+ [FRA_SRC] = { .minlen = sizeof(struct in6_addr) },
+ [FRA_DST] = { .minlen = sizeof(struct in6_addr) },
+};
+
+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 (frh->src_len > 128 || frh->dst_len > 128 ||
+ (frh->tos & ~IPV6_FLOWINFO_MASK))
+ goto errout;
+
+ 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 (tb[FRA_SRC])
+ nla_memcpy(&rule6->src.addr, tb[FRA_SRC],
+ sizeof(struct in6_addr));
+
+ if (tb[FRA_DST])
+ 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 (tb[FRA_SRC] &&
+ nla_memcmp(tb[FRA_SRC], &rule6->src.addr, sizeof(struct in6_addr)))
+ return 0;
+
+ if (tb[FRA_DST] &&
+ 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;
+}
+
+int fib6_rules_dump(struct sk_buff *skb, struct netlink_callback *cb)
+{
+ return fib_rules_dump(skb, cb, AF_INET6);
+}
+
+static u32 fib6_rule_default_pref(void)
+{
+ return 0x3FFF;
+}
+
+static struct fib_rules_ops fib6_rules_ops = {
+ .family = AF_INET6,
+ .rule_size = sizeof(struct fib6_rule),
+ .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,
+ .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);
+}