2 * This program is free software; you can redistribute it and/or modify
3 * it under the terms of the GNU General Public License version 2 as
4 * published by the Free Software Foundation.
7 #include <linux/kernel.h>
8 #include <linux/init.h>
9 #include <linux/module.h>
10 #include <linux/netlink.h>
11 #include <linux/netfilter.h>
12 #include <linux/netfilter/nf_tables.h>
13 #include <linux/netfilter_ipv6.h>
14 #include <net/netfilter/nf_tables_core.h>
15 #include <net/netfilter/nf_tables.h>
16 #include <net/netfilter/nft_fib.h>
18 #include <net/ip6_fib.h>
19 #include <net/ip6_route.h>
21 static int get_ifindex(const struct net_device *dev)
23 return dev ? dev->ifindex : 0;
26 static int nft_fib6_flowi_init(struct flowi6 *fl6, const struct nft_fib *priv,
27 const struct nft_pktinfo *pkt,
28 const struct net_device *dev,
33 if (priv->flags & NFTA_FIB_F_DADDR) {
34 fl6->daddr = iph->daddr;
35 fl6->saddr = iph->saddr;
37 fl6->daddr = iph->saddr;
38 fl6->saddr = iph->daddr;
41 if (ipv6_addr_type(&fl6->daddr) & IPV6_ADDR_LINKLOCAL) {
42 lookup_flags |= RT6_LOOKUP_F_IFACE;
43 fl6->flowi6_oif = get_ifindex(dev ? dev : pkt->skb->dev);
44 } else if ((priv->flags & NFTA_FIB_F_IIF) &&
45 (netif_is_l3_master(dev) || netif_is_l3_slave(dev))) {
46 fl6->flowi6_oif = dev->ifindex;
49 if (ipv6_addr_type(&fl6->saddr) & IPV6_ADDR_UNICAST)
50 lookup_flags |= RT6_LOOKUP_F_HAS_SADDR;
52 if (priv->flags & NFTA_FIB_F_MARK)
53 fl6->flowi6_mark = pkt->skb->mark;
55 fl6->flowlabel = (*(__be32 *)iph) & IPV6_FLOWINFO_MASK;
60 static u32 __nft_fib6_eval_type(const struct nft_fib *priv,
61 const struct nft_pktinfo *pkt,
64 const struct net_device *dev = NULL;
65 const struct nf_ipv6_ops *v6ops;
66 const struct nf_afinfo *afinfo;
67 int route_err, addrtype;
70 .flowi6_iif = LOOPBACK_IFINDEX,
71 .flowi6_proto = pkt->tprot,
75 afinfo = nf_get_afinfo(NFPROTO_IPV6);
77 return RTN_UNREACHABLE;
79 if (priv->flags & NFTA_FIB_F_IIF)
81 else if (priv->flags & NFTA_FIB_F_OIF)
84 nft_fib6_flowi_init(&fl6, priv, pkt, dev, iph);
86 v6ops = nf_get_ipv6_ops();
87 if (dev && v6ops && v6ops->chk_addr(nft_net(pkt), &fl6.daddr, dev, true))
90 route_err = afinfo->route(nft_net(pkt), (struct dst_entry **)&rt,
91 flowi6_to_flowi(&fl6), false);
95 if (rt->rt6i_flags & RTF_REJECT) {
96 route_err = rt->dst.error;
97 dst_release(&rt->dst);
101 if (ipv6_anycast_destination((struct dst_entry *)rt, &fl6.daddr))
103 else if (!dev && rt->rt6i_flags & RTF_LOCAL)
106 dst_release(&rt->dst);
111 addrtype = ipv6_addr_type(&fl6.daddr);
113 if (addrtype & IPV6_ADDR_MULTICAST)
114 return RTN_MULTICAST;
115 if (addrtype & IPV6_ADDR_UNICAST)
122 return RTN_BLACKHOLE;
131 return RTN_UNREACHABLE;
134 void nft_fib6_eval_type(const struct nft_expr *expr, struct nft_regs *regs,
135 const struct nft_pktinfo *pkt)
137 const struct nft_fib *priv = nft_expr_priv(expr);
138 int noff = skb_network_offset(pkt->skb);
139 u32 *dest = ®s->data[priv->dreg];
140 struct ipv6hdr *iph, _iph;
142 iph = skb_header_pointer(pkt->skb, noff, sizeof(_iph), &_iph);
144 regs->verdict.code = NFT_BREAK;
148 *dest = __nft_fib6_eval_type(priv, pkt, iph);
150 EXPORT_SYMBOL_GPL(nft_fib6_eval_type);
152 void nft_fib6_eval(const struct nft_expr *expr, struct nft_regs *regs,
153 const struct nft_pktinfo *pkt)
155 const struct nft_fib *priv = nft_expr_priv(expr);
156 int noff = skb_network_offset(pkt->skb);
157 const struct net_device *oif = NULL;
158 u32 *dest = ®s->data[priv->dreg];
159 struct ipv6hdr *iph, _iph;
160 struct flowi6 fl6 = {
161 .flowi6_iif = LOOPBACK_IFINDEX,
162 .flowi6_proto = pkt->tprot,
167 if (priv->flags & NFTA_FIB_F_IIF)
169 else if (priv->flags & NFTA_FIB_F_OIF)
172 iph = skb_header_pointer(pkt->skb, noff, sizeof(_iph), &_iph);
174 regs->verdict.code = NFT_BREAK;
178 lookup_flags = nft_fib6_flowi_init(&fl6, priv, pkt, oif, iph);
180 if (nft_hook(pkt) == NF_INET_PRE_ROUTING &&
181 nft_fib_is_loopback(pkt->skb, nft_in(pkt))) {
182 nft_fib_store_result(dest, priv, pkt,
183 nft_in(pkt)->ifindex);
188 rt = (void *)ip6_route_lookup(nft_net(pkt), &fl6, lookup_flags);
192 /* Should not see RTF_LOCAL here */
193 if (rt->rt6i_flags & (RTF_REJECT | RTF_ANYCAST | RTF_LOCAL))
196 if (oif && oif != rt->rt6i_idev->dev &&
197 l3mdev_master_ifindex_rcu(rt->rt6i_idev->dev) != oif->ifindex)
200 switch (priv->result) {
201 case NFT_FIB_RESULT_OIF:
202 *dest = rt->rt6i_idev->dev->ifindex;
204 case NFT_FIB_RESULT_OIFNAME:
205 strncpy((char *)dest, rt->rt6i_idev->dev->name, IFNAMSIZ);
215 EXPORT_SYMBOL_GPL(nft_fib6_eval);
217 static struct nft_expr_type nft_fib6_type;
219 static const struct nft_expr_ops nft_fib6_type_ops = {
220 .type = &nft_fib6_type,
221 .size = NFT_EXPR_SIZE(sizeof(struct nft_fib)),
222 .eval = nft_fib6_eval_type,
223 .init = nft_fib_init,
224 .dump = nft_fib_dump,
225 .validate = nft_fib_validate,
228 static const struct nft_expr_ops nft_fib6_ops = {
229 .type = &nft_fib6_type,
230 .size = NFT_EXPR_SIZE(sizeof(struct nft_fib)),
231 .eval = nft_fib6_eval,
232 .init = nft_fib_init,
233 .dump = nft_fib_dump,
234 .validate = nft_fib_validate,
237 static const struct nft_expr_ops *
238 nft_fib6_select_ops(const struct nft_ctx *ctx,
239 const struct nlattr * const tb[])
241 enum nft_fib_result result;
243 if (!tb[NFTA_FIB_RESULT])
244 return ERR_PTR(-EINVAL);
246 result = ntohl(nla_get_be32(tb[NFTA_FIB_RESULT]));
249 case NFT_FIB_RESULT_OIF:
250 return &nft_fib6_ops;
251 case NFT_FIB_RESULT_OIFNAME:
252 return &nft_fib6_ops;
253 case NFT_FIB_RESULT_ADDRTYPE:
254 return &nft_fib6_type_ops;
256 return ERR_PTR(-EOPNOTSUPP);
260 static struct nft_expr_type nft_fib6_type __read_mostly = {
262 .select_ops = nft_fib6_select_ops,
263 .policy = nft_fib_policy,
264 .maxattr = NFTA_FIB_MAX,
265 .family = NFPROTO_IPV6,
266 .owner = THIS_MODULE,
269 static int __init nft_fib6_module_init(void)
271 return nft_register_expr(&nft_fib6_type);
274 static void __exit nft_fib6_module_exit(void)
276 nft_unregister_expr(&nft_fib6_type);
278 module_init(nft_fib6_module_init);
279 module_exit(nft_fib6_module_exit);
281 MODULE_LICENSE("GPL");
282 MODULE_AUTHOR("Florian Westphal <fw@strlen.de>");
283 MODULE_ALIAS_NFT_AF_EXPR(10, "fib");