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 int route_err, addrtype;
69 .flowi6_iif = LOOPBACK_IFINDEX,
70 .flowi6_proto = pkt->tprot,
74 v6ops = nf_get_ipv6_ops();
76 return RTN_UNREACHABLE;
78 if (priv->flags & NFTA_FIB_F_IIF)
80 else if (priv->flags & NFTA_FIB_F_OIF)
83 nft_fib6_flowi_init(&fl6, priv, pkt, dev, iph);
85 if (dev && v6ops->chk_addr(nft_net(pkt), &fl6.daddr, dev, true))
88 route_err = v6ops->route(nft_net(pkt), (struct dst_entry **)&rt,
89 flowi6_to_flowi(&fl6), false);
93 if (rt->rt6i_flags & RTF_REJECT) {
94 route_err = rt->dst.error;
95 dst_release(&rt->dst);
99 if (ipv6_anycast_destination((struct dst_entry *)rt, &fl6.daddr))
101 else if (!dev && rt->rt6i_flags & RTF_LOCAL)
104 dst_release(&rt->dst);
109 addrtype = ipv6_addr_type(&fl6.daddr);
111 if (addrtype & IPV6_ADDR_MULTICAST)
112 return RTN_MULTICAST;
113 if (addrtype & IPV6_ADDR_UNICAST)
120 return RTN_BLACKHOLE;
129 return RTN_UNREACHABLE;
132 void nft_fib6_eval_type(const struct nft_expr *expr, struct nft_regs *regs,
133 const struct nft_pktinfo *pkt)
135 const struct nft_fib *priv = nft_expr_priv(expr);
136 int noff = skb_network_offset(pkt->skb);
137 u32 *dest = ®s->data[priv->dreg];
138 struct ipv6hdr *iph, _iph;
140 iph = skb_header_pointer(pkt->skb, noff, sizeof(_iph), &_iph);
142 regs->verdict.code = NFT_BREAK;
146 *dest = __nft_fib6_eval_type(priv, pkt, iph);
148 EXPORT_SYMBOL_GPL(nft_fib6_eval_type);
150 void nft_fib6_eval(const struct nft_expr *expr, struct nft_regs *regs,
151 const struct nft_pktinfo *pkt)
153 const struct nft_fib *priv = nft_expr_priv(expr);
154 int noff = skb_network_offset(pkt->skb);
155 const struct net_device *oif = NULL;
156 u32 *dest = ®s->data[priv->dreg];
157 struct ipv6hdr *iph, _iph;
158 struct flowi6 fl6 = {
159 .flowi6_iif = LOOPBACK_IFINDEX,
160 .flowi6_proto = pkt->tprot,
165 if (priv->flags & NFTA_FIB_F_IIF)
167 else if (priv->flags & NFTA_FIB_F_OIF)
170 iph = skb_header_pointer(pkt->skb, noff, sizeof(_iph), &_iph);
172 regs->verdict.code = NFT_BREAK;
176 lookup_flags = nft_fib6_flowi_init(&fl6, priv, pkt, oif, iph);
178 if (nft_hook(pkt) == NF_INET_PRE_ROUTING &&
179 nft_fib_is_loopback(pkt->skb, nft_in(pkt))) {
180 nft_fib_store_result(dest, priv, pkt,
181 nft_in(pkt)->ifindex);
186 rt = (void *)ip6_route_lookup(nft_net(pkt), &fl6, pkt->skb,
191 /* Should not see RTF_LOCAL here */
192 if (rt->rt6i_flags & (RTF_REJECT | RTF_ANYCAST | RTF_LOCAL))
195 if (oif && oif != rt->rt6i_idev->dev &&
196 l3mdev_master_ifindex_rcu(rt->rt6i_idev->dev) != oif->ifindex)
199 switch (priv->result) {
200 case NFT_FIB_RESULT_OIF:
201 *dest = rt->rt6i_idev->dev->ifindex;
203 case NFT_FIB_RESULT_OIFNAME:
204 strncpy((char *)dest, rt->rt6i_idev->dev->name, IFNAMSIZ);
214 EXPORT_SYMBOL_GPL(nft_fib6_eval);
216 static struct nft_expr_type nft_fib6_type;
218 static const struct nft_expr_ops nft_fib6_type_ops = {
219 .type = &nft_fib6_type,
220 .size = NFT_EXPR_SIZE(sizeof(struct nft_fib)),
221 .eval = nft_fib6_eval_type,
222 .init = nft_fib_init,
223 .dump = nft_fib_dump,
224 .validate = nft_fib_validate,
227 static const struct nft_expr_ops nft_fib6_ops = {
228 .type = &nft_fib6_type,
229 .size = NFT_EXPR_SIZE(sizeof(struct nft_fib)),
230 .eval = nft_fib6_eval,
231 .init = nft_fib_init,
232 .dump = nft_fib_dump,
233 .validate = nft_fib_validate,
236 static const struct nft_expr_ops *
237 nft_fib6_select_ops(const struct nft_ctx *ctx,
238 const struct nlattr * const tb[])
240 enum nft_fib_result result;
242 if (!tb[NFTA_FIB_RESULT])
243 return ERR_PTR(-EINVAL);
245 result = ntohl(nla_get_be32(tb[NFTA_FIB_RESULT]));
248 case NFT_FIB_RESULT_OIF:
249 return &nft_fib6_ops;
250 case NFT_FIB_RESULT_OIFNAME:
251 return &nft_fib6_ops;
252 case NFT_FIB_RESULT_ADDRTYPE:
253 return &nft_fib6_type_ops;
255 return ERR_PTR(-EOPNOTSUPP);
259 static struct nft_expr_type nft_fib6_type __read_mostly = {
261 .select_ops = nft_fib6_select_ops,
262 .policy = nft_fib_policy,
263 .maxattr = NFTA_FIB_MAX,
264 .family = NFPROTO_IPV6,
265 .owner = THIS_MODULE,
268 static int __init nft_fib6_module_init(void)
270 return nft_register_expr(&nft_fib6_type);
273 static void __exit nft_fib6_module_exit(void)
275 nft_unregister_expr(&nft_fib6_type);
277 module_init(nft_fib6_module_init);
278 module_exit(nft_fib6_module_exit);
280 MODULE_LICENSE("GPL");
281 MODULE_AUTHOR("Florian Westphal <fw@strlen.de>");
282 MODULE_ALIAS_NFT_AF_EXPR(10, "fib");