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Linux/net/ipv4/netfilter/nft_fib_ipv4.c

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  1 /*
  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.
  5  */
  6 
  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 <net/netfilter/nf_tables_core.h>
 14 #include <net/netfilter/nf_tables.h>
 15 #include <net/netfilter/nft_fib.h>
 16 
 17 #include <net/ip_fib.h>
 18 #include <net/route.h>
 19 
 20 /* don't try to find route from mcast/bcast/zeronet */
 21 static __be32 get_saddr(__be32 addr)
 22 {
 23         if (ipv4_is_multicast(addr) || ipv4_is_lbcast(addr) ||
 24             ipv4_is_zeronet(addr))
 25                 return 0;
 26         return addr;
 27 }
 28 
 29 #define DSCP_BITS     0xfc
 30 
 31 void nft_fib4_eval_type(const struct nft_expr *expr, struct nft_regs *regs,
 32                         const struct nft_pktinfo *pkt)
 33 {
 34         const struct nft_fib *priv = nft_expr_priv(expr);
 35         int noff = skb_network_offset(pkt->skb);
 36         u32 *dst = &regs->data[priv->dreg];
 37         const struct net_device *dev = NULL;
 38         struct iphdr *iph, _iph;
 39         __be32 addr;
 40 
 41         if (priv->flags & NFTA_FIB_F_IIF)
 42                 dev = nft_in(pkt);
 43         else if (priv->flags & NFTA_FIB_F_OIF)
 44                 dev = nft_out(pkt);
 45 
 46         iph = skb_header_pointer(pkt->skb, noff, sizeof(_iph), &_iph);
 47         if (!iph) {
 48                 regs->verdict.code = NFT_BREAK;
 49                 return;
 50         }
 51 
 52         if (priv->flags & NFTA_FIB_F_DADDR)
 53                 addr = iph->daddr;
 54         else
 55                 addr = iph->saddr;
 56 
 57         *dst = inet_dev_addr_type(nft_net(pkt), dev, addr);
 58 }
 59 EXPORT_SYMBOL_GPL(nft_fib4_eval_type);
 60 
 61 static int get_ifindex(const struct net_device *dev)
 62 {
 63         return dev ? dev->ifindex : 0;
 64 }
 65 
 66 void nft_fib4_eval(const struct nft_expr *expr, struct nft_regs *regs,
 67                    const struct nft_pktinfo *pkt)
 68 {
 69         const struct nft_fib *priv = nft_expr_priv(expr);
 70         int noff = skb_network_offset(pkt->skb);
 71         u32 *dest = &regs->data[priv->dreg];
 72         struct iphdr *iph, _iph;
 73         struct fib_result res;
 74         struct flowi4 fl4 = {
 75                 .flowi4_scope = RT_SCOPE_UNIVERSE,
 76                 .flowi4_iif = LOOPBACK_IFINDEX,
 77         };
 78         const struct net_device *oif;
 79         const struct net_device *found;
 80 
 81         /*
 82          * Do not set flowi4_oif, it restricts results (for example, asking
 83          * for oif 3 will get RTN_UNICAST result even if the daddr exits
 84          * on another interface.
 85          *
 86          * Search results for the desired outinterface instead.
 87          */
 88         if (priv->flags & NFTA_FIB_F_OIF)
 89                 oif = nft_out(pkt);
 90         else if (priv->flags & NFTA_FIB_F_IIF)
 91                 oif = nft_in(pkt);
 92         else
 93                 oif = NULL;
 94 
 95         if (nft_hook(pkt) == NF_INET_PRE_ROUTING &&
 96             nft_fib_is_loopback(pkt->skb, nft_in(pkt))) {
 97                 nft_fib_store_result(dest, priv, pkt,
 98                                      nft_in(pkt)->ifindex);
 99                 return;
100         }
101 
102         iph = skb_header_pointer(pkt->skb, noff, sizeof(_iph), &_iph);
103         if (!iph) {
104                 regs->verdict.code = NFT_BREAK;
105                 return;
106         }
107 
108         if (ipv4_is_zeronet(iph->saddr)) {
109                 if (ipv4_is_lbcast(iph->daddr) ||
110                     ipv4_is_local_multicast(iph->daddr)) {
111                         nft_fib_store_result(dest, priv, pkt,
112                                              get_ifindex(pkt->skb->dev));
113                         return;
114                 }
115         }
116 
117         if (priv->flags & NFTA_FIB_F_MARK)
118                 fl4.flowi4_mark = pkt->skb->mark;
119 
120         fl4.flowi4_tos = iph->tos & DSCP_BITS;
121 
122         if (priv->flags & NFTA_FIB_F_DADDR) {
123                 fl4.daddr = iph->daddr;
124                 fl4.saddr = get_saddr(iph->saddr);
125         } else {
126                 fl4.daddr = iph->saddr;
127                 fl4.saddr = get_saddr(iph->daddr);
128         }
129 
130         *dest = 0;
131 
132         if (fib_lookup(nft_net(pkt), &fl4, &res, FIB_LOOKUP_IGNORE_LINKSTATE))
133                 return;
134 
135         switch (res.type) {
136         case RTN_UNICAST:
137                 break;
138         case RTN_LOCAL: /* Should not see RTN_LOCAL here */
139                 return;
140         default:
141                 break;
142         }
143 
144        if (!oif) {
145                found = FIB_RES_DEV(res);
146         } else {
147                 if (!fib_info_nh_uses_dev(res.fi, oif))
148                         return;
149 
150                 found = oif;
151         }
152 
153         switch (priv->result) {
154         case NFT_FIB_RESULT_OIF:
155                 *dest = found->ifindex;
156                 break;
157         case NFT_FIB_RESULT_OIFNAME:
158                 strncpy((char *)dest, found->name, IFNAMSIZ);
159                 break;
160         default:
161                 WARN_ON_ONCE(1);
162                 break;
163         }
164 }
165 EXPORT_SYMBOL_GPL(nft_fib4_eval);
166 
167 static struct nft_expr_type nft_fib4_type;
168 
169 static const struct nft_expr_ops nft_fib4_type_ops = {
170         .type           = &nft_fib4_type,
171         .size           = NFT_EXPR_SIZE(sizeof(struct nft_fib)),
172         .eval           = nft_fib4_eval_type,
173         .init           = nft_fib_init,
174         .dump           = nft_fib_dump,
175         .validate       = nft_fib_validate,
176 };
177 
178 static const struct nft_expr_ops nft_fib4_ops = {
179         .type           = &nft_fib4_type,
180         .size           = NFT_EXPR_SIZE(sizeof(struct nft_fib)),
181         .eval           = nft_fib4_eval,
182         .init           = nft_fib_init,
183         .dump           = nft_fib_dump,
184         .validate       = nft_fib_validate,
185 };
186 
187 static const struct nft_expr_ops *
188 nft_fib4_select_ops(const struct nft_ctx *ctx,
189                     const struct nlattr * const tb[])
190 {
191         enum nft_fib_result result;
192 
193         if (!tb[NFTA_FIB_RESULT])
194                 return ERR_PTR(-EINVAL);
195 
196         result = ntohl(nla_get_be32(tb[NFTA_FIB_RESULT]));
197 
198         switch (result) {
199         case NFT_FIB_RESULT_OIF:
200                 return &nft_fib4_ops;
201         case NFT_FIB_RESULT_OIFNAME:
202                 return &nft_fib4_ops;
203         case NFT_FIB_RESULT_ADDRTYPE:
204                 return &nft_fib4_type_ops;
205         default:
206                 return ERR_PTR(-EOPNOTSUPP);
207         }
208 }
209 
210 static struct nft_expr_type nft_fib4_type __read_mostly = {
211         .name           = "fib",
212         .select_ops     = nft_fib4_select_ops,
213         .policy         = nft_fib_policy,
214         .maxattr        = NFTA_FIB_MAX,
215         .family         = NFPROTO_IPV4,
216         .owner          = THIS_MODULE,
217 };
218 
219 static int __init nft_fib4_module_init(void)
220 {
221         return nft_register_expr(&nft_fib4_type);
222 }
223 
224 static void __exit nft_fib4_module_exit(void)
225 {
226         nft_unregister_expr(&nft_fib4_type);
227 }
228 
229 module_init(nft_fib4_module_init);
230 module_exit(nft_fib4_module_exit);
231 MODULE_LICENSE("GPL");
232 MODULE_AUTHOR("Florian Westphal <fw@strlen.de>");
233 MODULE_ALIAS_NFT_AF_EXPR(2, "fib");
234 

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