1d2912cb1SThomas Gleixner // SPDX-License-Identifier: GPL-2.0-only 296518518SPatrick McHardy /* 3ef1f7df9SPatrick McHardy * Copyright (c) 2008-2009 Patrick McHardy <kaber@trash.net> 496518518SPatrick McHardy * 596518518SPatrick McHardy * Development of this code funded by Astaro AG (http://www.astaro.com/) 696518518SPatrick McHardy */ 796518518SPatrick McHardy 896518518SPatrick McHardy #include <linux/kernel.h> 996518518SPatrick McHardy #include <linux/init.h> 1096518518SPatrick McHardy #include <linux/module.h> 1196518518SPatrick McHardy #include <linux/netlink.h> 1296518518SPatrick McHardy #include <linux/netfilter.h> 138819efc9SPablo Neira Ayuso #include <linux/if_arp.h> 1496518518SPatrick McHardy #include <linux/netfilter/nf_tables.h> 1596518518SPatrick McHardy #include <net/netfilter/nf_tables_core.h> 16c9626a2cSPablo Neira Ayuso #include <net/netfilter/nf_tables_offload.h> 1796518518SPatrick McHardy #include <net/netfilter/nf_tables.h> 1896518518SPatrick McHardy 1996518518SPatrick McHardy struct nft_cmp_expr { 2096518518SPatrick McHardy struct nft_data data; 214f16d25cSPablo Neira Ayuso u8 sreg; 2296518518SPatrick McHardy u8 len; 2396518518SPatrick McHardy enum nft_cmp_ops op:8; 2496518518SPatrick McHardy }; 2596518518SPatrick McHardy 2610870dd8SFlorian Westphal void nft_cmp_eval(const struct nft_expr *expr, 27a55e22e9SPatrick McHardy struct nft_regs *regs, 2896518518SPatrick McHardy const struct nft_pktinfo *pkt) 2996518518SPatrick McHardy { 3096518518SPatrick McHardy const struct nft_cmp_expr *priv = nft_expr_priv(expr); 3196518518SPatrick McHardy int d; 3296518518SPatrick McHardy 33e562d860SPatrick McHardy d = memcmp(®s->data[priv->sreg], &priv->data, priv->len); 3496518518SPatrick McHardy switch (priv->op) { 3596518518SPatrick McHardy case NFT_CMP_EQ: 3696518518SPatrick McHardy if (d != 0) 3796518518SPatrick McHardy goto mismatch; 3896518518SPatrick McHardy break; 3996518518SPatrick McHardy case NFT_CMP_NEQ: 4096518518SPatrick McHardy if (d == 0) 4196518518SPatrick McHardy goto mismatch; 4296518518SPatrick McHardy break; 4396518518SPatrick McHardy case NFT_CMP_LT: 4496518518SPatrick McHardy if (d == 0) 4596518518SPatrick McHardy goto mismatch; 46954d8297SGustavo A. R. Silva fallthrough; 4796518518SPatrick McHardy case NFT_CMP_LTE: 4896518518SPatrick McHardy if (d > 0) 4996518518SPatrick McHardy goto mismatch; 5096518518SPatrick McHardy break; 5196518518SPatrick McHardy case NFT_CMP_GT: 5296518518SPatrick McHardy if (d == 0) 5396518518SPatrick McHardy goto mismatch; 54954d8297SGustavo A. R. Silva fallthrough; 5596518518SPatrick McHardy case NFT_CMP_GTE: 5696518518SPatrick McHardy if (d < 0) 5796518518SPatrick McHardy goto mismatch; 5896518518SPatrick McHardy break; 5996518518SPatrick McHardy } 6096518518SPatrick McHardy return; 6196518518SPatrick McHardy 6296518518SPatrick McHardy mismatch: 63a55e22e9SPatrick McHardy regs->verdict.code = NFT_BREAK; 6496518518SPatrick McHardy } 6596518518SPatrick McHardy 6696518518SPatrick McHardy static const struct nla_policy nft_cmp_policy[NFTA_CMP_MAX + 1] = { 6796518518SPatrick McHardy [NFTA_CMP_SREG] = { .type = NLA_U32 }, 6896518518SPatrick McHardy [NFTA_CMP_OP] = { .type = NLA_U32 }, 6996518518SPatrick McHardy [NFTA_CMP_DATA] = { .type = NLA_NESTED }, 7096518518SPatrick McHardy }; 7196518518SPatrick McHardy 7296518518SPatrick McHardy static int nft_cmp_init(const struct nft_ctx *ctx, const struct nft_expr *expr, 7396518518SPatrick McHardy const struct nlattr * const tb[]) 7496518518SPatrick McHardy { 7596518518SPatrick McHardy struct nft_cmp_expr *priv = nft_expr_priv(expr); 7696518518SPatrick McHardy struct nft_data_desc desc; 7796518518SPatrick McHardy int err; 7896518518SPatrick McHardy 79d0a11fc3SPatrick McHardy err = nft_data_init(NULL, &priv->data, sizeof(priv->data), &desc, 80d0a11fc3SPatrick McHardy tb[NFTA_CMP_DATA]); 81fa5950e4SFlorian Westphal if (err < 0) 82fa5950e4SFlorian Westphal return err; 8396518518SPatrick McHardy 840d2c96afSPablo Neira Ayuso if (desc.type != NFT_DATA_VALUE) { 850d2c96afSPablo Neira Ayuso err = -EINVAL; 860d2c96afSPablo Neira Ayuso nft_data_release(&priv->data, desc.type); 870d2c96afSPablo Neira Ayuso return err; 880d2c96afSPablo Neira Ayuso } 890d2c96afSPablo Neira Ayuso 904f16d25cSPablo Neira Ayuso err = nft_parse_register_load(tb[NFTA_CMP_SREG], &priv->sreg, desc.len); 91d07db988SPatrick McHardy if (err < 0) 92d07db988SPatrick McHardy return err; 93d07db988SPatrick McHardy 94d07db988SPatrick McHardy priv->op = ntohl(nla_get_be32(tb[NFTA_CMP_OP])); 9596518518SPatrick McHardy priv->len = desc.len; 9696518518SPatrick McHardy return 0; 9796518518SPatrick McHardy } 9896518518SPatrick McHardy 9996518518SPatrick McHardy static int nft_cmp_dump(struct sk_buff *skb, const struct nft_expr *expr) 10096518518SPatrick McHardy { 10196518518SPatrick McHardy const struct nft_cmp_expr *priv = nft_expr_priv(expr); 10296518518SPatrick McHardy 103b1c96ed3SPatrick McHardy if (nft_dump_register(skb, NFTA_CMP_SREG, priv->sreg)) 10496518518SPatrick McHardy goto nla_put_failure; 10596518518SPatrick McHardy if (nla_put_be32(skb, NFTA_CMP_OP, htonl(priv->op))) 10696518518SPatrick McHardy goto nla_put_failure; 10796518518SPatrick McHardy 10896518518SPatrick McHardy if (nft_data_dump(skb, NFTA_CMP_DATA, &priv->data, 10996518518SPatrick McHardy NFT_DATA_VALUE, priv->len) < 0) 11096518518SPatrick McHardy goto nla_put_failure; 11196518518SPatrick McHardy return 0; 11296518518SPatrick McHardy 11396518518SPatrick McHardy nla_put_failure: 11496518518SPatrick McHardy return -1; 11596518518SPatrick McHardy } 11696518518SPatrick McHardy 117ff4d90a8SPablo Neira Ayuso union nft_cmp_offload_data { 118ff4d90a8SPablo Neira Ayuso u16 val16; 119ff4d90a8SPablo Neira Ayuso u32 val32; 120ff4d90a8SPablo Neira Ayuso u64 val64; 121ff4d90a8SPablo Neira Ayuso }; 122ff4d90a8SPablo Neira Ayuso 123ff4d90a8SPablo Neira Ayuso static void nft_payload_n2h(union nft_cmp_offload_data *data, 124ff4d90a8SPablo Neira Ayuso const u8 *val, u32 len) 125ff4d90a8SPablo Neira Ayuso { 126ff4d90a8SPablo Neira Ayuso switch (len) { 127ff4d90a8SPablo Neira Ayuso case 2: 128ff4d90a8SPablo Neira Ayuso data->val16 = ntohs(*((u16 *)val)); 129ff4d90a8SPablo Neira Ayuso break; 130ff4d90a8SPablo Neira Ayuso case 4: 131ff4d90a8SPablo Neira Ayuso data->val32 = ntohl(*((u32 *)val)); 132ff4d90a8SPablo Neira Ayuso break; 133ff4d90a8SPablo Neira Ayuso case 8: 134ff4d90a8SPablo Neira Ayuso data->val64 = be64_to_cpu(*((u64 *)val)); 135ff4d90a8SPablo Neira Ayuso break; 136ff4d90a8SPablo Neira Ayuso default: 137ff4d90a8SPablo Neira Ayuso WARN_ON_ONCE(1); 138ff4d90a8SPablo Neira Ayuso break; 139ff4d90a8SPablo Neira Ayuso } 140ff4d90a8SPablo Neira Ayuso } 141ff4d90a8SPablo Neira Ayuso 142c9626a2cSPablo Neira Ayuso static int __nft_cmp_offload(struct nft_offload_ctx *ctx, 143c9626a2cSPablo Neira Ayuso struct nft_flow_rule *flow, 144c9626a2cSPablo Neira Ayuso const struct nft_cmp_expr *priv) 145c9626a2cSPablo Neira Ayuso { 146c9626a2cSPablo Neira Ayuso struct nft_offload_reg *reg = &ctx->regs[priv->sreg]; 147ff4d90a8SPablo Neira Ayuso union nft_cmp_offload_data _data, _datamask; 148c9626a2cSPablo Neira Ayuso u8 *mask = (u8 *)&flow->match.mask; 149c9626a2cSPablo Neira Ayuso u8 *key = (u8 *)&flow->match.key; 150ff4d90a8SPablo Neira Ayuso u8 *data, *datamask; 151c9626a2cSPablo Neira Ayuso 152a5d45bc0SPablo Neira Ayuso if (priv->op != NFT_CMP_EQ || priv->len > reg->len) 153c9626a2cSPablo Neira Ayuso return -EOPNOTSUPP; 154c9626a2cSPablo Neira Ayuso 155ff4d90a8SPablo Neira Ayuso if (reg->flags & NFT_OFFLOAD_F_NETWORK2HOST) { 156ff4d90a8SPablo Neira Ayuso nft_payload_n2h(&_data, (u8 *)&priv->data, reg->len); 157ff4d90a8SPablo Neira Ayuso nft_payload_n2h(&_datamask, (u8 *)®->mask, reg->len); 158ff4d90a8SPablo Neira Ayuso data = (u8 *)&_data; 159ff4d90a8SPablo Neira Ayuso datamask = (u8 *)&_datamask; 160ff4d90a8SPablo Neira Ayuso } else { 161ff4d90a8SPablo Neira Ayuso data = (u8 *)&priv->data; 162ff4d90a8SPablo Neira Ayuso datamask = (u8 *)®->mask; 163ff4d90a8SPablo Neira Ayuso } 164ff4d90a8SPablo Neira Ayuso 165ff4d90a8SPablo Neira Ayuso memcpy(key + reg->offset, data, reg->len); 166ff4d90a8SPablo Neira Ayuso memcpy(mask + reg->offset, datamask, reg->len); 167c9626a2cSPablo Neira Ayuso 168c9626a2cSPablo Neira Ayuso flow->match.dissector.used_keys |= BIT(reg->key); 169c9626a2cSPablo Neira Ayuso flow->match.dissector.offset[reg->key] = reg->base_offset; 170c9626a2cSPablo Neira Ayuso 1718819efc9SPablo Neira Ayuso if (reg->key == FLOW_DISSECTOR_KEY_META && 1728819efc9SPablo Neira Ayuso reg->offset == offsetof(struct nft_flow_key, meta.ingress_iftype) && 1738819efc9SPablo Neira Ayuso nft_reg_load16(priv->data.data) != ARPHRD_ETHER) 1748819efc9SPablo Neira Ayuso return -EOPNOTSUPP; 1758819efc9SPablo Neira Ayuso 176a5d45bc0SPablo Neira Ayuso nft_offload_update_dependency(ctx, &priv->data, reg->len); 177c9626a2cSPablo Neira Ayuso 178c9626a2cSPablo Neira Ayuso return 0; 179c9626a2cSPablo Neira Ayuso } 180c9626a2cSPablo Neira Ayuso 181c9626a2cSPablo Neira Ayuso static int nft_cmp_offload(struct nft_offload_ctx *ctx, 182c9626a2cSPablo Neira Ayuso struct nft_flow_rule *flow, 183c9626a2cSPablo Neira Ayuso const struct nft_expr *expr) 184c9626a2cSPablo Neira Ayuso { 185c9626a2cSPablo Neira Ayuso const struct nft_cmp_expr *priv = nft_expr_priv(expr); 186c9626a2cSPablo Neira Ayuso 187c9626a2cSPablo Neira Ayuso return __nft_cmp_offload(ctx, flow, priv); 188c9626a2cSPablo Neira Ayuso } 189c9626a2cSPablo Neira Ayuso 190ef1f7df9SPatrick McHardy static const struct nft_expr_ops nft_cmp_ops = { 191ef1f7df9SPatrick McHardy .type = &nft_cmp_type, 19296518518SPatrick McHardy .size = NFT_EXPR_SIZE(sizeof(struct nft_cmp_expr)), 19396518518SPatrick McHardy .eval = nft_cmp_eval, 19496518518SPatrick McHardy .init = nft_cmp_init, 19596518518SPatrick McHardy .dump = nft_cmp_dump, 196c9626a2cSPablo Neira Ayuso .offload = nft_cmp_offload, 197ef1f7df9SPatrick McHardy }; 198ef1f7df9SPatrick McHardy 199cb7dbfd0SPatrick McHardy static int nft_cmp_fast_init(const struct nft_ctx *ctx, 200cb7dbfd0SPatrick McHardy const struct nft_expr *expr, 201cb7dbfd0SPatrick McHardy const struct nlattr * const tb[]) 202cb7dbfd0SPatrick McHardy { 203cb7dbfd0SPatrick McHardy struct nft_cmp_fast_expr *priv = nft_expr_priv(expr); 204cb7dbfd0SPatrick McHardy struct nft_data_desc desc; 205cb7dbfd0SPatrick McHardy struct nft_data data; 206cb7dbfd0SPatrick McHardy int err; 207cb7dbfd0SPatrick McHardy 208d0a11fc3SPatrick McHardy err = nft_data_init(NULL, &data, sizeof(data), &desc, 209d0a11fc3SPatrick McHardy tb[NFTA_CMP_DATA]); 210fa5950e4SFlorian Westphal if (err < 0) 211fa5950e4SFlorian Westphal return err; 212cb7dbfd0SPatrick McHardy 2134f16d25cSPablo Neira Ayuso err = nft_parse_register_load(tb[NFTA_CMP_SREG], &priv->sreg, desc.len); 214d07db988SPatrick McHardy if (err < 0) 215d07db988SPatrick McHardy return err; 216d07db988SPatrick McHardy 217d07db988SPatrick McHardy desc.len *= BITS_PER_BYTE; 218d07db988SPatrick McHardy 2195f48846dSPhil Sutter priv->mask = nft_cmp_fast_mask(desc.len); 2205f48846dSPhil Sutter priv->data = data.data[0] & priv->mask; 221cb7dbfd0SPatrick McHardy priv->len = desc.len; 2225f48846dSPhil Sutter priv->inv = ntohl(nla_get_be32(tb[NFTA_CMP_OP])) != NFT_CMP_EQ; 223cb7dbfd0SPatrick McHardy return 0; 224cb7dbfd0SPatrick McHardy } 225cb7dbfd0SPatrick McHardy 226c9626a2cSPablo Neira Ayuso static int nft_cmp_fast_offload(struct nft_offload_ctx *ctx, 227c9626a2cSPablo Neira Ayuso struct nft_flow_rule *flow, 228c9626a2cSPablo Neira Ayuso const struct nft_expr *expr) 229c9626a2cSPablo Neira Ayuso { 230c9626a2cSPablo Neira Ayuso const struct nft_cmp_fast_expr *priv = nft_expr_priv(expr); 231c9626a2cSPablo Neira Ayuso struct nft_cmp_expr cmp = { 232c9626a2cSPablo Neira Ayuso .data = { 233c9626a2cSPablo Neira Ayuso .data = { 234c9626a2cSPablo Neira Ayuso [0] = priv->data, 235c9626a2cSPablo Neira Ayuso }, 236c9626a2cSPablo Neira Ayuso }, 237c9626a2cSPablo Neira Ayuso .sreg = priv->sreg, 238c9626a2cSPablo Neira Ayuso .len = priv->len / BITS_PER_BYTE, 2395f48846dSPhil Sutter .op = priv->inv ? NFT_CMP_NEQ : NFT_CMP_EQ, 240c9626a2cSPablo Neira Ayuso }; 241c9626a2cSPablo Neira Ayuso 242c9626a2cSPablo Neira Ayuso return __nft_cmp_offload(ctx, flow, &cmp); 243c9626a2cSPablo Neira Ayuso } 244c9626a2cSPablo Neira Ayuso 245cb7dbfd0SPatrick McHardy static int nft_cmp_fast_dump(struct sk_buff *skb, const struct nft_expr *expr) 246cb7dbfd0SPatrick McHardy { 247cb7dbfd0SPatrick McHardy const struct nft_cmp_fast_expr *priv = nft_expr_priv(expr); 2485f48846dSPhil Sutter enum nft_cmp_ops op = priv->inv ? NFT_CMP_NEQ : NFT_CMP_EQ; 249cb7dbfd0SPatrick McHardy struct nft_data data; 250cb7dbfd0SPatrick McHardy 251b1c96ed3SPatrick McHardy if (nft_dump_register(skb, NFTA_CMP_SREG, priv->sreg)) 252cb7dbfd0SPatrick McHardy goto nla_put_failure; 2535f48846dSPhil Sutter if (nla_put_be32(skb, NFTA_CMP_OP, htonl(op))) 254cb7dbfd0SPatrick McHardy goto nla_put_failure; 255cb7dbfd0SPatrick McHardy 256cb7dbfd0SPatrick McHardy data.data[0] = priv->data; 257cb7dbfd0SPatrick McHardy if (nft_data_dump(skb, NFTA_CMP_DATA, &data, 258cb7dbfd0SPatrick McHardy NFT_DATA_VALUE, priv->len / BITS_PER_BYTE) < 0) 259cb7dbfd0SPatrick McHardy goto nla_put_failure; 260cb7dbfd0SPatrick McHardy return 0; 261cb7dbfd0SPatrick McHardy 262cb7dbfd0SPatrick McHardy nla_put_failure: 263cb7dbfd0SPatrick McHardy return -1; 264cb7dbfd0SPatrick McHardy } 265cb7dbfd0SPatrick McHardy 266cb7dbfd0SPatrick McHardy const struct nft_expr_ops nft_cmp_fast_ops = { 267cb7dbfd0SPatrick McHardy .type = &nft_cmp_type, 268cb7dbfd0SPatrick McHardy .size = NFT_EXPR_SIZE(sizeof(struct nft_cmp_fast_expr)), 269cb7dbfd0SPatrick McHardy .eval = NULL, /* inlined */ 270cb7dbfd0SPatrick McHardy .init = nft_cmp_fast_init, 271cb7dbfd0SPatrick McHardy .dump = nft_cmp_fast_dump, 272c9626a2cSPablo Neira Ayuso .offload = nft_cmp_fast_offload, 273cb7dbfd0SPatrick McHardy }; 274cb7dbfd0SPatrick McHardy 275*23f68d46SPablo Neira Ayuso static u32 nft_cmp_mask(u32 bitlen) 276*23f68d46SPablo Neira Ayuso { 277*23f68d46SPablo Neira Ayuso return (__force u32)cpu_to_le32(~0U >> (sizeof(u32) * BITS_PER_BYTE - bitlen)); 278*23f68d46SPablo Neira Ayuso } 279*23f68d46SPablo Neira Ayuso 280*23f68d46SPablo Neira Ayuso static void nft_cmp16_fast_mask(struct nft_data *data, unsigned int bitlen) 281*23f68d46SPablo Neira Ayuso { 282*23f68d46SPablo Neira Ayuso int len = bitlen / BITS_PER_BYTE; 283*23f68d46SPablo Neira Ayuso int i, words = len / sizeof(u32); 284*23f68d46SPablo Neira Ayuso 285*23f68d46SPablo Neira Ayuso for (i = 0; i < words; i++) { 286*23f68d46SPablo Neira Ayuso data->data[i] = 0xffffffff; 287*23f68d46SPablo Neira Ayuso bitlen -= sizeof(u32) * BITS_PER_BYTE; 288*23f68d46SPablo Neira Ayuso } 289*23f68d46SPablo Neira Ayuso 290*23f68d46SPablo Neira Ayuso if (len % sizeof(u32)) 291*23f68d46SPablo Neira Ayuso data->data[i++] = nft_cmp_mask(bitlen); 292*23f68d46SPablo Neira Ayuso 293*23f68d46SPablo Neira Ayuso for (; i < 4; i++) 294*23f68d46SPablo Neira Ayuso data->data[i] = 0; 295*23f68d46SPablo Neira Ayuso } 296*23f68d46SPablo Neira Ayuso 297*23f68d46SPablo Neira Ayuso static int nft_cmp16_fast_init(const struct nft_ctx *ctx, 298*23f68d46SPablo Neira Ayuso const struct nft_expr *expr, 299*23f68d46SPablo Neira Ayuso const struct nlattr * const tb[]) 300*23f68d46SPablo Neira Ayuso { 301*23f68d46SPablo Neira Ayuso struct nft_cmp16_fast_expr *priv = nft_expr_priv(expr); 302*23f68d46SPablo Neira Ayuso struct nft_data_desc desc; 303*23f68d46SPablo Neira Ayuso int err; 304*23f68d46SPablo Neira Ayuso 305*23f68d46SPablo Neira Ayuso err = nft_data_init(NULL, &priv->data, sizeof(priv->data), &desc, 306*23f68d46SPablo Neira Ayuso tb[NFTA_CMP_DATA]); 307*23f68d46SPablo Neira Ayuso if (err < 0) 308*23f68d46SPablo Neira Ayuso return err; 309*23f68d46SPablo Neira Ayuso 310*23f68d46SPablo Neira Ayuso err = nft_parse_register_load(tb[NFTA_CMP_SREG], &priv->sreg, desc.len); 311*23f68d46SPablo Neira Ayuso if (err < 0) 312*23f68d46SPablo Neira Ayuso return err; 313*23f68d46SPablo Neira Ayuso 314*23f68d46SPablo Neira Ayuso nft_cmp16_fast_mask(&priv->mask, desc.len * BITS_PER_BYTE); 315*23f68d46SPablo Neira Ayuso priv->inv = ntohl(nla_get_be32(tb[NFTA_CMP_OP])) != NFT_CMP_EQ; 316*23f68d46SPablo Neira Ayuso priv->len = desc.len; 317*23f68d46SPablo Neira Ayuso 318*23f68d46SPablo Neira Ayuso return 0; 319*23f68d46SPablo Neira Ayuso } 320*23f68d46SPablo Neira Ayuso 321*23f68d46SPablo Neira Ayuso static int nft_cmp16_fast_offload(struct nft_offload_ctx *ctx, 322*23f68d46SPablo Neira Ayuso struct nft_flow_rule *flow, 323*23f68d46SPablo Neira Ayuso const struct nft_expr *expr) 324*23f68d46SPablo Neira Ayuso { 325*23f68d46SPablo Neira Ayuso const struct nft_cmp16_fast_expr *priv = nft_expr_priv(expr); 326*23f68d46SPablo Neira Ayuso struct nft_cmp_expr cmp = { 327*23f68d46SPablo Neira Ayuso .data = priv->data, 328*23f68d46SPablo Neira Ayuso .sreg = priv->sreg, 329*23f68d46SPablo Neira Ayuso .len = priv->len, 330*23f68d46SPablo Neira Ayuso .op = priv->inv ? NFT_CMP_NEQ : NFT_CMP_EQ, 331*23f68d46SPablo Neira Ayuso }; 332*23f68d46SPablo Neira Ayuso 333*23f68d46SPablo Neira Ayuso return __nft_cmp_offload(ctx, flow, &cmp); 334*23f68d46SPablo Neira Ayuso } 335*23f68d46SPablo Neira Ayuso 336*23f68d46SPablo Neira Ayuso static int nft_cmp16_fast_dump(struct sk_buff *skb, const struct nft_expr *expr) 337*23f68d46SPablo Neira Ayuso { 338*23f68d46SPablo Neira Ayuso const struct nft_cmp16_fast_expr *priv = nft_expr_priv(expr); 339*23f68d46SPablo Neira Ayuso enum nft_cmp_ops op = priv->inv ? NFT_CMP_NEQ : NFT_CMP_EQ; 340*23f68d46SPablo Neira Ayuso 341*23f68d46SPablo Neira Ayuso if (nft_dump_register(skb, NFTA_CMP_SREG, priv->sreg)) 342*23f68d46SPablo Neira Ayuso goto nla_put_failure; 343*23f68d46SPablo Neira Ayuso if (nla_put_be32(skb, NFTA_CMP_OP, htonl(op))) 344*23f68d46SPablo Neira Ayuso goto nla_put_failure; 345*23f68d46SPablo Neira Ayuso 346*23f68d46SPablo Neira Ayuso if (nft_data_dump(skb, NFTA_CMP_DATA, &priv->data, 347*23f68d46SPablo Neira Ayuso NFT_DATA_VALUE, priv->len) < 0) 348*23f68d46SPablo Neira Ayuso goto nla_put_failure; 349*23f68d46SPablo Neira Ayuso return 0; 350*23f68d46SPablo Neira Ayuso 351*23f68d46SPablo Neira Ayuso nla_put_failure: 352*23f68d46SPablo Neira Ayuso return -1; 353*23f68d46SPablo Neira Ayuso } 354*23f68d46SPablo Neira Ayuso 355*23f68d46SPablo Neira Ayuso 356*23f68d46SPablo Neira Ayuso const struct nft_expr_ops nft_cmp16_fast_ops = { 357*23f68d46SPablo Neira Ayuso .type = &nft_cmp_type, 358*23f68d46SPablo Neira Ayuso .size = NFT_EXPR_SIZE(sizeof(struct nft_cmp16_fast_expr)), 359*23f68d46SPablo Neira Ayuso .eval = NULL, /* inlined */ 360*23f68d46SPablo Neira Ayuso .init = nft_cmp16_fast_init, 361*23f68d46SPablo Neira Ayuso .dump = nft_cmp16_fast_dump, 362*23f68d46SPablo Neira Ayuso .offload = nft_cmp16_fast_offload, 363*23f68d46SPablo Neira Ayuso }; 364*23f68d46SPablo Neira Ayuso 3650ca743a5SPablo Neira Ayuso static const struct nft_expr_ops * 3660ca743a5SPablo Neira Ayuso nft_cmp_select_ops(const struct nft_ctx *ctx, const struct nlattr * const tb[]) 367cb7dbfd0SPatrick McHardy { 368cb7dbfd0SPatrick McHardy struct nft_data_desc desc; 369cb7dbfd0SPatrick McHardy struct nft_data data; 370cb7dbfd0SPatrick McHardy enum nft_cmp_ops op; 371*23f68d46SPablo Neira Ayuso u8 sreg; 372cb7dbfd0SPatrick McHardy int err; 373cb7dbfd0SPatrick McHardy 374cb7dbfd0SPatrick McHardy if (tb[NFTA_CMP_SREG] == NULL || 375cb7dbfd0SPatrick McHardy tb[NFTA_CMP_OP] == NULL || 376cb7dbfd0SPatrick McHardy tb[NFTA_CMP_DATA] == NULL) 377cb7dbfd0SPatrick McHardy return ERR_PTR(-EINVAL); 378cb7dbfd0SPatrick McHardy 379cb7dbfd0SPatrick McHardy op = ntohl(nla_get_be32(tb[NFTA_CMP_OP])); 380cb7dbfd0SPatrick McHardy switch (op) { 381cb7dbfd0SPatrick McHardy case NFT_CMP_EQ: 382cb7dbfd0SPatrick McHardy case NFT_CMP_NEQ: 383cb7dbfd0SPatrick McHardy case NFT_CMP_LT: 384cb7dbfd0SPatrick McHardy case NFT_CMP_LTE: 385cb7dbfd0SPatrick McHardy case NFT_CMP_GT: 386cb7dbfd0SPatrick McHardy case NFT_CMP_GTE: 387cb7dbfd0SPatrick McHardy break; 388cb7dbfd0SPatrick McHardy default: 389cb7dbfd0SPatrick McHardy return ERR_PTR(-EINVAL); 390cb7dbfd0SPatrick McHardy } 391cb7dbfd0SPatrick McHardy 392d0a11fc3SPatrick McHardy err = nft_data_init(NULL, &data, sizeof(data), &desc, 393d0a11fc3SPatrick McHardy tb[NFTA_CMP_DATA]); 394cb7dbfd0SPatrick McHardy if (err < 0) 395cb7dbfd0SPatrick McHardy return ERR_PTR(err); 396cb7dbfd0SPatrick McHardy 397626899a0SColin Ian King if (desc.type != NFT_DATA_VALUE) 39871df14b0SPablo Neira Ayuso goto err1; 39971df14b0SPablo Neira Ayuso 400*23f68d46SPablo Neira Ayuso sreg = ntohl(nla_get_be32(tb[NFTA_CMP_SREG])); 40171df14b0SPablo Neira Ayuso 402*23f68d46SPablo Neira Ayuso if (op == NFT_CMP_EQ || op == NFT_CMP_NEQ) { 403*23f68d46SPablo Neira Ayuso if (desc.len <= sizeof(u32)) 404*23f68d46SPablo Neira Ayuso return &nft_cmp_fast_ops; 405*23f68d46SPablo Neira Ayuso else if (desc.len <= sizeof(data) && 406*23f68d46SPablo Neira Ayuso ((sreg >= NFT_REG_1 && sreg <= NFT_REG_4) || 407*23f68d46SPablo Neira Ayuso (sreg >= NFT_REG32_00 && sreg <= NFT_REG32_12 && sreg % 2 == 0))) 408*23f68d46SPablo Neira Ayuso return &nft_cmp16_fast_ops; 409*23f68d46SPablo Neira Ayuso } 410cb7dbfd0SPatrick McHardy return &nft_cmp_ops; 41171df14b0SPablo Neira Ayuso err1: 41259105446SPablo Neira Ayuso nft_data_release(&data, desc.type); 41371df14b0SPablo Neira Ayuso return ERR_PTR(-EINVAL); 414cb7dbfd0SPatrick McHardy } 415cb7dbfd0SPatrick McHardy 4164e24877eSLiping Zhang struct nft_expr_type nft_cmp_type __read_mostly = { 417ef1f7df9SPatrick McHardy .name = "cmp", 418cb7dbfd0SPatrick McHardy .select_ops = nft_cmp_select_ops, 41996518518SPatrick McHardy .policy = nft_cmp_policy, 42096518518SPatrick McHardy .maxattr = NFTA_CMP_MAX, 421ef1f7df9SPatrick McHardy .owner = THIS_MODULE, 42296518518SPatrick McHardy }; 423