Thomas Gleixner | 75a6faf | 2019-06-01 10:08:37 +0200 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0-only |
Pablo Neira Ayuso | c97d22e | 2016-11-28 00:05:38 +0100 | [diff] [blame] | 2 | /* |
| 3 | * Copyright (c) 2012-2016 Pablo Neira Ayuso <pablo@netfilter.org> |
Pablo Neira Ayuso | c97d22e | 2016-11-28 00:05:38 +0100 | [diff] [blame] | 4 | */ |
| 5 | |
| 6 | #include <linux/init.h> |
| 7 | #include <linux/module.h> |
| 8 | #include <linux/skbuff.h> |
| 9 | #include <linux/netlink.h> |
| 10 | #include <linux/netfilter.h> |
| 11 | #include <linux/netfilter/nf_tables.h> |
| 12 | #include <net/netfilter/nf_tables.h> |
| 13 | |
| 14 | #define nft_objref_priv(expr) *((struct nft_object **)nft_expr_priv(expr)) |
| 15 | |
| 16 | static void nft_objref_eval(const struct nft_expr *expr, |
| 17 | struct nft_regs *regs, |
| 18 | const struct nft_pktinfo *pkt) |
| 19 | { |
| 20 | struct nft_object *obj = nft_objref_priv(expr); |
| 21 | |
Pablo M. Bermudo Garay | dfc4603 | 2017-08-23 22:41:23 +0200 | [diff] [blame] | 22 | obj->ops->eval(obj, regs, pkt); |
Pablo Neira Ayuso | c97d22e | 2016-11-28 00:05:38 +0100 | [diff] [blame] | 23 | } |
| 24 | |
| 25 | static int nft_objref_init(const struct nft_ctx *ctx, |
| 26 | const struct nft_expr *expr, |
| 27 | const struct nlattr * const tb[]) |
| 28 | { |
| 29 | struct nft_object *obj = nft_objref_priv(expr); |
| 30 | u8 genmask = nft_genmask_next(ctx->net); |
| 31 | u32 objtype; |
| 32 | |
| 33 | if (!tb[NFTA_OBJREF_IMM_NAME] || |
| 34 | !tb[NFTA_OBJREF_IMM_TYPE]) |
| 35 | return -EINVAL; |
| 36 | |
| 37 | objtype = ntohl(nla_get_be32(tb[NFTA_OBJREF_IMM_TYPE])); |
Florian Westphal | 4d44175 | 2019-01-08 15:45:59 +0100 | [diff] [blame] | 38 | obj = nft_obj_lookup(ctx->net, ctx->table, |
| 39 | tb[NFTA_OBJREF_IMM_NAME], objtype, |
Pablo Neira Ayuso | cac20fc | 2018-03-28 12:06:51 +0200 | [diff] [blame] | 40 | genmask); |
Pablo Neira Ayuso | c97d22e | 2016-11-28 00:05:38 +0100 | [diff] [blame] | 41 | if (IS_ERR(obj)) |
| 42 | return -ENOENT; |
| 43 | |
| 44 | nft_objref_priv(expr) = obj; |
| 45 | obj->use++; |
| 46 | |
| 47 | return 0; |
| 48 | } |
| 49 | |
| 50 | static int nft_objref_dump(struct sk_buff *skb, const struct nft_expr *expr) |
| 51 | { |
| 52 | const struct nft_object *obj = nft_objref_priv(expr); |
| 53 | |
Florian Westphal | d152159 | 2019-01-08 15:45:58 +0100 | [diff] [blame] | 54 | if (nla_put_string(skb, NFTA_OBJREF_IMM_NAME, obj->key.name) || |
Pablo M. Bermudo Garay | dfc4603 | 2017-08-23 22:41:23 +0200 | [diff] [blame] | 55 | nla_put_be32(skb, NFTA_OBJREF_IMM_TYPE, |
| 56 | htonl(obj->ops->type->type))) |
Pablo Neira Ayuso | c97d22e | 2016-11-28 00:05:38 +0100 | [diff] [blame] | 57 | goto nla_put_failure; |
| 58 | |
| 59 | return 0; |
| 60 | |
| 61 | nla_put_failure: |
| 62 | return -1; |
| 63 | } |
| 64 | |
Pablo Neira Ayuso | 8ffcd32 | 2019-03-14 10:50:20 +0100 | [diff] [blame] | 65 | static void nft_objref_deactivate(const struct nft_ctx *ctx, |
| 66 | const struct nft_expr *expr, |
| 67 | enum nft_trans_phase phase) |
Pablo Neira Ayuso | c97d22e | 2016-11-28 00:05:38 +0100 | [diff] [blame] | 68 | { |
| 69 | struct nft_object *obj = nft_objref_priv(expr); |
| 70 | |
Pablo Neira Ayuso | 8ffcd32 | 2019-03-14 10:50:20 +0100 | [diff] [blame] | 71 | if (phase == NFT_TRANS_COMMIT) |
| 72 | return; |
| 73 | |
Pablo Neira Ayuso | c97d22e | 2016-11-28 00:05:38 +0100 | [diff] [blame] | 74 | obj->use--; |
| 75 | } |
| 76 | |
Pablo Neira Ayuso | 8ffcd32 | 2019-03-14 10:50:20 +0100 | [diff] [blame] | 77 | static void nft_objref_activate(const struct nft_ctx *ctx, |
| 78 | const struct nft_expr *expr) |
| 79 | { |
| 80 | struct nft_object *obj = nft_objref_priv(expr); |
| 81 | |
| 82 | obj->use++; |
| 83 | } |
| 84 | |
Pablo Neira Ayuso | c97d22e | 2016-11-28 00:05:38 +0100 | [diff] [blame] | 85 | static struct nft_expr_type nft_objref_type; |
| 86 | static const struct nft_expr_ops nft_objref_ops = { |
| 87 | .type = &nft_objref_type, |
| 88 | .size = NFT_EXPR_SIZE(sizeof(struct nft_object *)), |
| 89 | .eval = nft_objref_eval, |
| 90 | .init = nft_objref_init, |
Pablo Neira Ayuso | 8ffcd32 | 2019-03-14 10:50:20 +0100 | [diff] [blame] | 91 | .activate = nft_objref_activate, |
| 92 | .deactivate = nft_objref_deactivate, |
Pablo Neira Ayuso | c97d22e | 2016-11-28 00:05:38 +0100 | [diff] [blame] | 93 | .dump = nft_objref_dump, |
| 94 | }; |
| 95 | |
Pablo Neira Ayuso | 63aea29 | 2016-11-28 00:06:03 +0100 | [diff] [blame] | 96 | struct nft_objref_map { |
| 97 | struct nft_set *set; |
| 98 | enum nft_registers sreg:8; |
| 99 | struct nft_set_binding binding; |
| 100 | }; |
| 101 | |
| 102 | static void nft_objref_map_eval(const struct nft_expr *expr, |
| 103 | struct nft_regs *regs, |
| 104 | const struct nft_pktinfo *pkt) |
| 105 | { |
| 106 | struct nft_objref_map *priv = nft_expr_priv(expr); |
| 107 | const struct nft_set *set = priv->set; |
| 108 | const struct nft_set_ext *ext; |
| 109 | struct nft_object *obj; |
| 110 | bool found; |
| 111 | |
| 112 | found = set->ops->lookup(nft_net(pkt), set, ®s->data[priv->sreg], |
| 113 | &ext); |
| 114 | if (!found) { |
| 115 | regs->verdict.code = NFT_BREAK; |
| 116 | return; |
| 117 | } |
| 118 | obj = *nft_set_ext_obj(ext); |
Pablo M. Bermudo Garay | dfc4603 | 2017-08-23 22:41:23 +0200 | [diff] [blame] | 119 | obj->ops->eval(obj, regs, pkt); |
Pablo Neira Ayuso | 63aea29 | 2016-11-28 00:06:03 +0100 | [diff] [blame] | 120 | } |
| 121 | |
| 122 | static int nft_objref_map_init(const struct nft_ctx *ctx, |
| 123 | const struct nft_expr *expr, |
| 124 | const struct nlattr * const tb[]) |
| 125 | { |
| 126 | struct nft_objref_map *priv = nft_expr_priv(expr); |
| 127 | u8 genmask = nft_genmask_next(ctx->net); |
| 128 | struct nft_set *set; |
| 129 | int err; |
| 130 | |
Pablo Neira Ayuso | 10659cb | 2018-03-28 12:06:49 +0200 | [diff] [blame] | 131 | set = nft_set_lookup_global(ctx->net, ctx->table, |
| 132 | tb[NFTA_OBJREF_SET_NAME], |
| 133 | tb[NFTA_OBJREF_SET_ID], genmask); |
Pablo Neira Ayuso | c7a72e3 | 2017-03-06 17:46:20 +0100 | [diff] [blame] | 134 | if (IS_ERR(set)) |
| 135 | return PTR_ERR(set); |
Pablo Neira Ayuso | 63aea29 | 2016-11-28 00:06:03 +0100 | [diff] [blame] | 136 | |
| 137 | if (!(set->flags & NFT_SET_OBJECT)) |
| 138 | return -EINVAL; |
| 139 | |
| 140 | priv->sreg = nft_parse_register(tb[NFTA_OBJREF_SET_SREG]); |
| 141 | err = nft_validate_register_load(priv->sreg, set->klen); |
| 142 | if (err < 0) |
| 143 | return err; |
| 144 | |
| 145 | priv->binding.flags = set->flags & NFT_SET_OBJECT; |
| 146 | |
| 147 | err = nf_tables_bind_set(ctx, set, &priv->binding); |
| 148 | if (err < 0) |
| 149 | return err; |
| 150 | |
| 151 | priv->set = set; |
| 152 | return 0; |
| 153 | } |
| 154 | |
| 155 | static int nft_objref_map_dump(struct sk_buff *skb, const struct nft_expr *expr) |
| 156 | { |
| 157 | const struct nft_objref_map *priv = nft_expr_priv(expr); |
| 158 | |
| 159 | if (nft_dump_register(skb, NFTA_OBJREF_SET_SREG, priv->sreg) || |
| 160 | nla_put_string(skb, NFTA_OBJREF_SET_NAME, priv->set->name)) |
| 161 | goto nla_put_failure; |
| 162 | |
| 163 | return 0; |
| 164 | |
| 165 | nla_put_failure: |
| 166 | return -1; |
| 167 | } |
| 168 | |
Florian Westphal | cd5125d | 2018-08-29 14:41:30 +0200 | [diff] [blame] | 169 | static void nft_objref_map_deactivate(const struct nft_ctx *ctx, |
Pablo Neira Ayuso | f6ac858 | 2019-02-02 10:49:13 +0100 | [diff] [blame] | 170 | const struct nft_expr *expr, |
| 171 | enum nft_trans_phase phase) |
Florian Westphal | cd5125d | 2018-08-29 14:41:30 +0200 | [diff] [blame] | 172 | { |
| 173 | struct nft_objref_map *priv = nft_expr_priv(expr); |
| 174 | |
Pablo Neira Ayuso | 273fe3f | 2019-03-08 15:30:03 +0100 | [diff] [blame] | 175 | nf_tables_deactivate_set(ctx, priv->set, &priv->binding, phase); |
| 176 | } |
Pablo Neira Ayuso | f6ac858 | 2019-02-02 10:49:13 +0100 | [diff] [blame] | 177 | |
Pablo Neira Ayuso | 273fe3f | 2019-03-08 15:30:03 +0100 | [diff] [blame] | 178 | static void nft_objref_map_activate(const struct nft_ctx *ctx, |
| 179 | const struct nft_expr *expr) |
| 180 | { |
| 181 | struct nft_objref_map *priv = nft_expr_priv(expr); |
| 182 | |
| 183 | priv->set->use++; |
Florian Westphal | cd5125d | 2018-08-29 14:41:30 +0200 | [diff] [blame] | 184 | } |
| 185 | |
Pablo Neira Ayuso | 63aea29 | 2016-11-28 00:06:03 +0100 | [diff] [blame] | 186 | static void nft_objref_map_destroy(const struct nft_ctx *ctx, |
| 187 | const struct nft_expr *expr) |
| 188 | { |
| 189 | struct nft_objref_map *priv = nft_expr_priv(expr); |
| 190 | |
Florian Westphal | cd5125d | 2018-08-29 14:41:30 +0200 | [diff] [blame] | 191 | nf_tables_destroy_set(ctx, priv->set); |
Pablo Neira Ayuso | 63aea29 | 2016-11-28 00:06:03 +0100 | [diff] [blame] | 192 | } |
| 193 | |
| 194 | static struct nft_expr_type nft_objref_type; |
| 195 | static const struct nft_expr_ops nft_objref_map_ops = { |
| 196 | .type = &nft_objref_type, |
| 197 | .size = NFT_EXPR_SIZE(sizeof(struct nft_objref_map)), |
| 198 | .eval = nft_objref_map_eval, |
| 199 | .init = nft_objref_map_init, |
Pablo Neira Ayuso | 273fe3f | 2019-03-08 15:30:03 +0100 | [diff] [blame] | 200 | .activate = nft_objref_map_activate, |
Florian Westphal | cd5125d | 2018-08-29 14:41:30 +0200 | [diff] [blame] | 201 | .deactivate = nft_objref_map_deactivate, |
Pablo Neira Ayuso | 63aea29 | 2016-11-28 00:06:03 +0100 | [diff] [blame] | 202 | .destroy = nft_objref_map_destroy, |
| 203 | .dump = nft_objref_map_dump, |
| 204 | }; |
| 205 | |
| 206 | static const struct nft_expr_ops * |
| 207 | nft_objref_select_ops(const struct nft_ctx *ctx, |
| 208 | const struct nlattr * const tb[]) |
| 209 | { |
| 210 | if (tb[NFTA_OBJREF_SET_SREG] && |
| 211 | (tb[NFTA_OBJREF_SET_NAME] || |
| 212 | tb[NFTA_OBJREF_SET_ID])) |
| 213 | return &nft_objref_map_ops; |
| 214 | else if (tb[NFTA_OBJREF_IMM_NAME] && |
| 215 | tb[NFTA_OBJREF_IMM_TYPE]) |
| 216 | return &nft_objref_ops; |
| 217 | |
| 218 | return ERR_PTR(-EOPNOTSUPP); |
| 219 | } |
| 220 | |
Pablo Neira Ayuso | c97d22e | 2016-11-28 00:05:38 +0100 | [diff] [blame] | 221 | static const struct nla_policy nft_objref_policy[NFTA_OBJREF_MAX + 1] = { |
Liping Zhang | b2fbd04 | 2017-01-20 21:03:03 +0800 | [diff] [blame] | 222 | [NFTA_OBJREF_IMM_NAME] = { .type = NLA_STRING, |
| 223 | .len = NFT_OBJ_MAXNAMELEN - 1 }, |
Pablo Neira Ayuso | c97d22e | 2016-11-28 00:05:38 +0100 | [diff] [blame] | 224 | [NFTA_OBJREF_IMM_TYPE] = { .type = NLA_U32 }, |
Pablo Neira Ayuso | 63aea29 | 2016-11-28 00:06:03 +0100 | [diff] [blame] | 225 | [NFTA_OBJREF_SET_SREG] = { .type = NLA_U32 }, |
Liping Zhang | b2fbd04 | 2017-01-20 21:03:03 +0800 | [diff] [blame] | 226 | [NFTA_OBJREF_SET_NAME] = { .type = NLA_STRING, |
| 227 | .len = NFT_SET_MAXNAMELEN - 1 }, |
Pablo Neira Ayuso | 63aea29 | 2016-11-28 00:06:03 +0100 | [diff] [blame] | 228 | [NFTA_OBJREF_SET_ID] = { .type = NLA_U32 }, |
Pablo Neira Ayuso | c97d22e | 2016-11-28 00:05:38 +0100 | [diff] [blame] | 229 | }; |
| 230 | |
| 231 | static struct nft_expr_type nft_objref_type __read_mostly = { |
| 232 | .name = "objref", |
Pablo Neira Ayuso | 63aea29 | 2016-11-28 00:06:03 +0100 | [diff] [blame] | 233 | .select_ops = nft_objref_select_ops, |
Pablo Neira Ayuso | c97d22e | 2016-11-28 00:05:38 +0100 | [diff] [blame] | 234 | .policy = nft_objref_policy, |
| 235 | .maxattr = NFTA_OBJREF_MAX, |
| 236 | .owner = THIS_MODULE, |
| 237 | }; |
| 238 | |
| 239 | static int __init nft_objref_module_init(void) |
| 240 | { |
| 241 | return nft_register_expr(&nft_objref_type); |
| 242 | } |
| 243 | |
| 244 | static void __exit nft_objref_module_exit(void) |
| 245 | { |
| 246 | nft_unregister_expr(&nft_objref_type); |
| 247 | } |
| 248 | |
| 249 | module_init(nft_objref_module_init); |
| 250 | module_exit(nft_objref_module_exit); |
| 251 | |
| 252 | MODULE_LICENSE("GPL"); |
| 253 | MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>"); |
| 254 | MODULE_ALIAS_NFT_EXPR("objref"); |