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);
46 if (ipv6_addr_type(&fl6->saddr) & IPV6_ADDR_UNICAST)
47 lookup_flags |= RT6_LOOKUP_F_HAS_SADDR;
49 if (priv->flags & NFTA_FIB_F_MARK)
50 fl6->flowi6_mark = pkt->skb->mark;
52 fl6->flowlabel = (*(__be32 *)iph) & IPV6_FLOWINFO_MASK;
57 static u32 __nft_fib6_eval_type(const struct nft_fib *priv,
58 const struct nft_pktinfo *pkt,
61 const struct net_device *dev = NULL;
62 const struct nf_ipv6_ops *v6ops;
63 const struct nf_afinfo *afinfo;
64 int route_err, addrtype;
67 .flowi6_iif = LOOPBACK_IFINDEX,
68 .flowi6_proto = pkt->tprot,
72 afinfo = nf_get_afinfo(NFPROTO_IPV6);
74 return RTN_UNREACHABLE;
76 if (priv->flags & NFTA_FIB_F_IIF)
78 else if (priv->flags & NFTA_FIB_F_OIF)
81 nft_fib6_flowi_init(&fl6, priv, pkt, dev, iph);
83 v6ops = nf_get_ipv6_ops();
84 if (dev && v6ops && v6ops->chk_addr(nft_net(pkt), &fl6.daddr, dev, true))
87 route_err = afinfo->route(nft_net(pkt), (struct dst_entry **)&rt,
88 flowi6_to_flowi(&fl6), false);
92 if (rt->rt6i_flags & RTF_REJECT) {
93 route_err = rt->dst.error;
94 dst_release(&rt->dst);
98 if (ipv6_anycast_destination((struct dst_entry *)rt, &fl6.daddr))
100 else if (!dev && rt->rt6i_flags & RTF_LOCAL)
103 dst_release(&rt->dst);
108 addrtype = ipv6_addr_type(&fl6.daddr);
110 if (addrtype & IPV6_ADDR_MULTICAST)
111 return RTN_MULTICAST;
112 if (addrtype & IPV6_ADDR_UNICAST)
119 return RTN_BLACKHOLE;
128 return RTN_UNREACHABLE;
131 void nft_fib6_eval_type(const struct nft_expr *expr, struct nft_regs *regs,
132 const struct nft_pktinfo *pkt)
134 const struct nft_fib *priv = nft_expr_priv(expr);
135 int noff = skb_network_offset(pkt->skb);
136 u32 *dest = ®s->data[priv->dreg];
137 struct ipv6hdr *iph, _iph;
139 iph = skb_header_pointer(pkt->skb, noff, sizeof(_iph), &_iph);
141 regs->verdict.code = NFT_BREAK;
145 *dest = __nft_fib6_eval_type(priv, pkt, iph);
147 EXPORT_SYMBOL_GPL(nft_fib6_eval_type);
149 void nft_fib6_eval(const struct nft_expr *expr, struct nft_regs *regs,
150 const struct nft_pktinfo *pkt)
152 const struct nft_fib *priv = nft_expr_priv(expr);
153 int noff = skb_network_offset(pkt->skb);
154 const struct net_device *oif = NULL;
155 u32 *dest = ®s->data[priv->dreg];
156 struct ipv6hdr *iph, _iph;
157 struct flowi6 fl6 = {
158 .flowi6_iif = LOOPBACK_IFINDEX,
159 .flowi6_proto = pkt->tprot,
164 if (priv->flags & NFTA_FIB_F_IIF)
166 else if (priv->flags & NFTA_FIB_F_OIF)
169 iph = skb_header_pointer(pkt->skb, noff, sizeof(_iph), &_iph);
171 regs->verdict.code = NFT_BREAK;
175 lookup_flags = nft_fib6_flowi_init(&fl6, priv, pkt, oif, iph);
177 if (nft_hook(pkt) == NF_INET_PRE_ROUTING &&
178 nft_fib_is_loopback(pkt->skb, nft_in(pkt))) {
179 nft_fib_store_result(dest, priv, pkt,
180 nft_in(pkt)->ifindex);
185 rt = (void *)ip6_route_lookup(nft_net(pkt), &fl6, lookup_flags);
189 /* Should not see RTF_LOCAL here */
190 if (rt->rt6i_flags & (RTF_REJECT | RTF_ANYCAST | RTF_LOCAL))
193 if (oif && oif != rt->rt6i_idev->dev)
196 switch (priv->result) {
197 case NFT_FIB_RESULT_OIF:
198 *dest = rt->rt6i_idev->dev->ifindex;
200 case NFT_FIB_RESULT_OIFNAME:
201 strncpy((char *)dest, rt->rt6i_idev->dev->name, IFNAMSIZ);
211 EXPORT_SYMBOL_GPL(nft_fib6_eval);
213 static struct nft_expr_type nft_fib6_type;
215 static const struct nft_expr_ops nft_fib6_type_ops = {
216 .type = &nft_fib6_type,
217 .size = NFT_EXPR_SIZE(sizeof(struct nft_fib)),
218 .eval = nft_fib6_eval_type,
219 .init = nft_fib_init,
220 .dump = nft_fib_dump,
221 .validate = nft_fib_validate,
224 static const struct nft_expr_ops nft_fib6_ops = {
225 .type = &nft_fib6_type,
226 .size = NFT_EXPR_SIZE(sizeof(struct nft_fib)),
227 .eval = nft_fib6_eval,
228 .init = nft_fib_init,
229 .dump = nft_fib_dump,
230 .validate = nft_fib_validate,
233 static const struct nft_expr_ops *
234 nft_fib6_select_ops(const struct nft_ctx *ctx,
235 const struct nlattr * const tb[])
237 enum nft_fib_result result;
239 if (!tb[NFTA_FIB_RESULT])
240 return ERR_PTR(-EINVAL);
242 result = ntohl(nla_get_be32(tb[NFTA_FIB_RESULT]));
245 case NFT_FIB_RESULT_OIF:
246 return &nft_fib6_ops;
247 case NFT_FIB_RESULT_OIFNAME:
248 return &nft_fib6_ops;
249 case NFT_FIB_RESULT_ADDRTYPE:
250 return &nft_fib6_type_ops;
252 return ERR_PTR(-EOPNOTSUPP);
256 static struct nft_expr_type nft_fib6_type __read_mostly = {
258 .select_ops = nft_fib6_select_ops,
259 .policy = nft_fib_policy,
260 .maxattr = NFTA_FIB_MAX,
261 .family = NFPROTO_IPV6,
262 .owner = THIS_MODULE,
265 static int __init nft_fib6_module_init(void)
267 return nft_register_expr(&nft_fib6_type);
270 static void __exit nft_fib6_module_exit(void)
272 nft_unregister_expr(&nft_fib6_type);
274 module_init(nft_fib6_module_init);
275 module_exit(nft_fib6_module_exit);
277 MODULE_LICENSE("GPL");
278 MODULE_AUTHOR("Florian Westphal <fw@strlen.de>");
279 MODULE_ALIAS_NFT_AF_EXPR(10, "fib");