Back to home page

OSCL-LXR
 
 

     

0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /*
0003  *
0004  * Generic part shared by ipv4 and ipv6 backends.
0005  */
0006 
0007 #include <linux/kernel.h>
0008 #include <linux/init.h>
0009 #include <linux/module.h>
0010 #include <linux/netlink.h>
0011 #include <linux/netfilter.h>
0012 #include <linux/netfilter/nf_tables.h>
0013 #include <net/netfilter/nf_tables_core.h>
0014 #include <net/netfilter/nf_tables.h>
0015 #include <net/netfilter/nft_fib.h>
0016 
0017 const struct nla_policy nft_fib_policy[NFTA_FIB_MAX + 1] = {
0018     [NFTA_FIB_DREG]     = { .type = NLA_U32 },
0019     [NFTA_FIB_RESULT]   = { .type = NLA_U32 },
0020     [NFTA_FIB_FLAGS]    = { .type = NLA_U32 },
0021 };
0022 EXPORT_SYMBOL(nft_fib_policy);
0023 
0024 #define NFTA_FIB_F_ALL (NFTA_FIB_F_SADDR | NFTA_FIB_F_DADDR | \
0025             NFTA_FIB_F_MARK | NFTA_FIB_F_IIF | NFTA_FIB_F_OIF | \
0026             NFTA_FIB_F_PRESENT)
0027 
0028 int nft_fib_validate(const struct nft_ctx *ctx, const struct nft_expr *expr,
0029              const struct nft_data **data)
0030 {
0031     const struct nft_fib *priv = nft_expr_priv(expr);
0032     unsigned int hooks;
0033 
0034     switch (priv->result) {
0035     case NFT_FIB_RESULT_OIF:
0036     case NFT_FIB_RESULT_OIFNAME:
0037         hooks = (1 << NF_INET_PRE_ROUTING);
0038         if (priv->flags & NFTA_FIB_F_IIF) {
0039             hooks |= (1 << NF_INET_LOCAL_IN) |
0040                  (1 << NF_INET_FORWARD);
0041         }
0042         break;
0043     case NFT_FIB_RESULT_ADDRTYPE:
0044         if (priv->flags & NFTA_FIB_F_IIF)
0045             hooks = (1 << NF_INET_PRE_ROUTING) |
0046                 (1 << NF_INET_LOCAL_IN) |
0047                 (1 << NF_INET_FORWARD);
0048         else if (priv->flags & NFTA_FIB_F_OIF)
0049             hooks = (1 << NF_INET_LOCAL_OUT) |
0050                 (1 << NF_INET_POST_ROUTING) |
0051                 (1 << NF_INET_FORWARD);
0052         else
0053             hooks = (1 << NF_INET_LOCAL_IN) |
0054                 (1 << NF_INET_LOCAL_OUT) |
0055                 (1 << NF_INET_FORWARD) |
0056                 (1 << NF_INET_PRE_ROUTING) |
0057                 (1 << NF_INET_POST_ROUTING);
0058 
0059         break;
0060     default:
0061         return -EINVAL;
0062     }
0063 
0064     return nft_chain_validate_hooks(ctx->chain, hooks);
0065 }
0066 EXPORT_SYMBOL_GPL(nft_fib_validate);
0067 
0068 int nft_fib_init(const struct nft_ctx *ctx, const struct nft_expr *expr,
0069          const struct nlattr * const tb[])
0070 {
0071     struct nft_fib *priv = nft_expr_priv(expr);
0072     unsigned int len;
0073     int err;
0074 
0075     if (!tb[NFTA_FIB_DREG] || !tb[NFTA_FIB_RESULT] || !tb[NFTA_FIB_FLAGS])
0076         return -EINVAL;
0077 
0078     priv->flags = ntohl(nla_get_be32(tb[NFTA_FIB_FLAGS]));
0079 
0080     if (priv->flags == 0 || (priv->flags & ~NFTA_FIB_F_ALL))
0081         return -EINVAL;
0082 
0083     if ((priv->flags & (NFTA_FIB_F_SADDR | NFTA_FIB_F_DADDR)) ==
0084                (NFTA_FIB_F_SADDR | NFTA_FIB_F_DADDR))
0085         return -EINVAL;
0086     if ((priv->flags & (NFTA_FIB_F_IIF | NFTA_FIB_F_OIF)) ==
0087                (NFTA_FIB_F_IIF | NFTA_FIB_F_OIF))
0088         return -EINVAL;
0089     if ((priv->flags & (NFTA_FIB_F_SADDR | NFTA_FIB_F_DADDR)) == 0)
0090         return -EINVAL;
0091 
0092     priv->result = ntohl(nla_get_be32(tb[NFTA_FIB_RESULT]));
0093 
0094     switch (priv->result) {
0095     case NFT_FIB_RESULT_OIF:
0096         if (priv->flags & NFTA_FIB_F_OIF)
0097             return -EINVAL;
0098         len = sizeof(int);
0099         break;
0100     case NFT_FIB_RESULT_OIFNAME:
0101         if (priv->flags & NFTA_FIB_F_OIF)
0102             return -EINVAL;
0103         len = IFNAMSIZ;
0104         break;
0105     case NFT_FIB_RESULT_ADDRTYPE:
0106         len = sizeof(u32);
0107         break;
0108     default:
0109         return -EINVAL;
0110     }
0111 
0112     err = nft_parse_register_store(ctx, tb[NFTA_FIB_DREG], &priv->dreg,
0113                        NULL, NFT_DATA_VALUE, len);
0114     if (err < 0)
0115         return err;
0116 
0117     return 0;
0118 }
0119 EXPORT_SYMBOL_GPL(nft_fib_init);
0120 
0121 int nft_fib_dump(struct sk_buff *skb, const struct nft_expr *expr)
0122 {
0123     const struct nft_fib *priv = nft_expr_priv(expr);
0124 
0125     if (nft_dump_register(skb, NFTA_FIB_DREG, priv->dreg))
0126         return -1;
0127 
0128     if (nla_put_be32(skb, NFTA_FIB_RESULT, htonl(priv->result)))
0129         return -1;
0130 
0131     if (nla_put_be32(skb, NFTA_FIB_FLAGS, htonl(priv->flags)))
0132         return -1;
0133 
0134     return 0;
0135 }
0136 EXPORT_SYMBOL_GPL(nft_fib_dump);
0137 
0138 void nft_fib_store_result(void *reg, const struct nft_fib *priv,
0139               const struct net_device *dev)
0140 {
0141     u32 *dreg = reg;
0142     int index;
0143 
0144     switch (priv->result) {
0145     case NFT_FIB_RESULT_OIF:
0146         index = dev ? dev->ifindex : 0;
0147         *dreg = (priv->flags & NFTA_FIB_F_PRESENT) ? !!index : index;
0148         break;
0149     case NFT_FIB_RESULT_OIFNAME:
0150         if (priv->flags & NFTA_FIB_F_PRESENT)
0151             *dreg = !!dev;
0152         else
0153             strncpy(reg, dev ? dev->name : "", IFNAMSIZ);
0154         break;
0155     default:
0156         WARN_ON_ONCE(1);
0157         *dreg = 0;
0158         break;
0159     }
0160 }
0161 EXPORT_SYMBOL_GPL(nft_fib_store_result);
0162 
0163 bool nft_fib_reduce(struct nft_regs_track *track,
0164             const struct nft_expr *expr)
0165 {
0166     const struct nft_fib *priv = nft_expr_priv(expr);
0167     unsigned int len = NFT_REG32_SIZE;
0168     const struct nft_fib *fib;
0169 
0170     switch (priv->result) {
0171     case NFT_FIB_RESULT_OIF:
0172         break;
0173     case NFT_FIB_RESULT_OIFNAME:
0174         if (priv->flags & NFTA_FIB_F_PRESENT)
0175             len = NFT_REG32_SIZE;
0176         else
0177             len = IFNAMSIZ;
0178         break;
0179     case NFT_FIB_RESULT_ADDRTYPE:
0180          break;
0181     default:
0182         WARN_ON_ONCE(1);
0183         break;
0184     }
0185 
0186     if (!nft_reg_track_cmp(track, expr, priv->dreg)) {
0187         nft_reg_track_update(track, expr, priv->dreg, len);
0188         return false;
0189     }
0190 
0191     fib = nft_expr_priv(track->regs[priv->dreg].selector);
0192     if (priv->result != fib->result ||
0193         priv->flags != fib->flags) {
0194         nft_reg_track_update(track, expr, priv->dreg, len);
0195         return false;
0196     }
0197 
0198     if (!track->regs[priv->dreg].bitwise)
0199         return true;
0200 
0201     return false;
0202 }
0203 EXPORT_SYMBOL_GPL(nft_fib_reduce);
0204 
0205 MODULE_LICENSE("GPL");
0206 MODULE_AUTHOR("Florian Westphal <fw@strlen.de>");
[ Source navigation ] [ Diff markup ] [ Identifier search ] [ general search ]

This page was automatically generated by the 2.1.0 LXR engine.

The LXR team
Valid CSS 2.1! Valid HTML 4.01!