| // SPDX-License-Identifier: GPL-2.0-only |
| /* |
| * Copyright (c) 2008-2009 Patrick McHardy <kaber@trash.net> |
| * |
| * Development of this code funded by Astaro AG (http://www.astaro.com/) |
| */ |
| |
| #include <linux/kernel.h> |
| #include <linux/init.h> |
| #include <linux/module.h> |
| #include <linux/netlink.h> |
| #include <linux/netfilter.h> |
| #include <linux/netfilter/nf_tables.h> |
| #include <net/netfilter/nf_tables_core.h> |
| #include <net/netfilter/nf_tables.h> |
| #include <net/netfilter/nf_tables_offload.h> |
| |
| void nft_immediate_eval(const struct nft_expr *expr, |
| struct nft_regs *regs, |
| const struct nft_pktinfo *pkt) |
| { |
| const struct nft_immediate_expr *priv = nft_expr_priv(expr); |
| |
| nft_data_copy(®s->data[priv->dreg], &priv->data, priv->dlen); |
| } |
| |
| static const struct nla_policy nft_immediate_policy[NFTA_IMMEDIATE_MAX + 1] = { |
| [NFTA_IMMEDIATE_DREG] = { .type = NLA_U32 }, |
| [NFTA_IMMEDIATE_DATA] = { .type = NLA_NESTED }, |
| }; |
| |
| static enum nft_data_types nft_reg_to_type(const struct nlattr *nla) |
| { |
| enum nft_data_types type; |
| u8 reg; |
| |
| reg = ntohl(nla_get_be32(nla)); |
| if (reg == NFT_REG_VERDICT) |
| type = NFT_DATA_VERDICT; |
| else |
| type = NFT_DATA_VALUE; |
| |
| return type; |
| } |
| |
| static int nft_immediate_init(const struct nft_ctx *ctx, |
| const struct nft_expr *expr, |
| const struct nlattr * const tb[]) |
| { |
| struct nft_immediate_expr *priv = nft_expr_priv(expr); |
| struct nft_data_desc desc = { |
| .size = sizeof(priv->data), |
| }; |
| int err; |
| |
| if (tb[NFTA_IMMEDIATE_DREG] == NULL || |
| tb[NFTA_IMMEDIATE_DATA] == NULL) |
| return -EINVAL; |
| |
| desc.type = nft_reg_to_type(tb[NFTA_IMMEDIATE_DREG]); |
| err = nft_data_init(ctx, &priv->data, &desc, tb[NFTA_IMMEDIATE_DATA]); |
| if (err < 0) |
| return err; |
| |
| priv->dlen = desc.len; |
| |
| err = nft_parse_register_store(ctx, tb[NFTA_IMMEDIATE_DREG], |
| &priv->dreg, &priv->data, desc.type, |
| desc.len); |
| if (err < 0) |
| goto err1; |
| |
| if (priv->dreg == NFT_REG_VERDICT) { |
| struct nft_chain *chain = priv->data.verdict.chain; |
| |
| switch (priv->data.verdict.code) { |
| case NFT_JUMP: |
| case NFT_GOTO: |
| err = nf_tables_bind_chain(ctx, chain); |
| if (err < 0) |
| return err; |
| break; |
| default: |
| break; |
| } |
| } |
| |
| return 0; |
| |
| err1: |
| nft_data_release(&priv->data, desc.type); |
| return err; |
| } |
| |
| static void nft_immediate_activate(const struct nft_ctx *ctx, |
| const struct nft_expr *expr) |
| { |
| const struct nft_immediate_expr *priv = nft_expr_priv(expr); |
| const struct nft_data *data = &priv->data; |
| struct nft_ctx chain_ctx; |
| struct nft_chain *chain; |
| struct nft_rule *rule; |
| |
| if (priv->dreg == NFT_REG_VERDICT) { |
| switch (data->verdict.code) { |
| case NFT_JUMP: |
| case NFT_GOTO: |
| chain = data->verdict.chain; |
| if (!nft_chain_binding(chain)) |
| break; |
| |
| chain_ctx = *ctx; |
| chain_ctx.chain = chain; |
| |
| list_for_each_entry(rule, &chain->rules, list) |
| nft_rule_expr_activate(&chain_ctx, rule); |
| |
| nft_clear(ctx->net, chain); |
| break; |
| default: |
| break; |
| } |
| } |
| |
| return nft_data_hold(&priv->data, nft_dreg_to_type(priv->dreg)); |
| } |
| |
| static void nft_immediate_deactivate(const struct nft_ctx *ctx, |
| const struct nft_expr *expr, |
| enum nft_trans_phase phase) |
| { |
| const struct nft_immediate_expr *priv = nft_expr_priv(expr); |
| const struct nft_data *data = &priv->data; |
| struct nft_ctx chain_ctx; |
| struct nft_chain *chain; |
| struct nft_rule *rule; |
| |
| if (priv->dreg == NFT_REG_VERDICT) { |
| switch (data->verdict.code) { |
| case NFT_JUMP: |
| case NFT_GOTO: |
| chain = data->verdict.chain; |
| if (!nft_chain_binding(chain)) |
| break; |
| |
| chain_ctx = *ctx; |
| chain_ctx.chain = chain; |
| |
| list_for_each_entry(rule, &chain->rules, list) |
| nft_rule_expr_deactivate(&chain_ctx, rule, phase); |
| |
| switch (phase) { |
| case NFT_TRANS_PREPARE_ERROR: |
| nf_tables_unbind_chain(ctx, chain); |
| fallthrough; |
| case NFT_TRANS_PREPARE: |
| nft_deactivate_next(ctx->net, chain); |
| break; |
| default: |
| nft_chain_del(chain); |
| chain->bound = false; |
| chain->table->use--; |
| break; |
| } |
| break; |
| default: |
| break; |
| } |
| } |
| |
| if (phase == NFT_TRANS_COMMIT) |
| return; |
| |
| return nft_data_release(&priv->data, nft_dreg_to_type(priv->dreg)); |
| } |
| |
| static void nft_immediate_destroy(const struct nft_ctx *ctx, |
| const struct nft_expr *expr) |
| { |
| const struct nft_immediate_expr *priv = nft_expr_priv(expr); |
| const struct nft_data *data = &priv->data; |
| struct nft_rule *rule, *n; |
| struct nft_ctx chain_ctx; |
| struct nft_chain *chain; |
| |
| if (priv->dreg != NFT_REG_VERDICT) |
| return; |
| |
| switch (data->verdict.code) { |
| case NFT_JUMP: |
| case NFT_GOTO: |
| chain = data->verdict.chain; |
| |
| if (!nft_chain_binding(chain)) |
| break; |
| |
| /* Rule construction failed, but chain is already bound: |
| * let the transaction records release this chain and its rules. |
| */ |
| if (chain->bound) { |
| chain->use--; |
| break; |
| } |
| |
| /* Rule has been deleted, release chain and its rules. */ |
| chain_ctx = *ctx; |
| chain_ctx.chain = chain; |
| |
| chain->use--; |
| list_for_each_entry_safe(rule, n, &chain->rules, list) { |
| chain->use--; |
| list_del(&rule->list); |
| nf_tables_rule_destroy(&chain_ctx, rule); |
| } |
| nf_tables_chain_destroy(&chain_ctx); |
| break; |
| default: |
| break; |
| } |
| } |
| |
| static int nft_immediate_dump(struct sk_buff *skb, |
| const struct nft_expr *expr, bool reset) |
| { |
| const struct nft_immediate_expr *priv = nft_expr_priv(expr); |
| |
| if (nft_dump_register(skb, NFTA_IMMEDIATE_DREG, priv->dreg)) |
| goto nla_put_failure; |
| |
| return nft_data_dump(skb, NFTA_IMMEDIATE_DATA, &priv->data, |
| nft_dreg_to_type(priv->dreg), priv->dlen); |
| |
| nla_put_failure: |
| return -1; |
| } |
| |
| static int nft_immediate_validate(const struct nft_ctx *ctx, |
| const struct nft_expr *expr, |
| const struct nft_data **d) |
| { |
| const struct nft_immediate_expr *priv = nft_expr_priv(expr); |
| struct nft_ctx *pctx = (struct nft_ctx *)ctx; |
| const struct nft_data *data; |
| int err; |
| |
| if (priv->dreg != NFT_REG_VERDICT) |
| return 0; |
| |
| data = &priv->data; |
| |
| switch (data->verdict.code) { |
| case NFT_JUMP: |
| case NFT_GOTO: |
| pctx->level++; |
| err = nft_chain_validate(ctx, data->verdict.chain); |
| if (err < 0) |
| return err; |
| pctx->level--; |
| break; |
| default: |
| break; |
| } |
| |
| return 0; |
| } |
| |
| static int nft_immediate_offload_verdict(struct nft_offload_ctx *ctx, |
| struct nft_flow_rule *flow, |
| const struct nft_immediate_expr *priv) |
| { |
| struct flow_action_entry *entry; |
| const struct nft_data *data; |
| |
| entry = &flow->rule->action.entries[ctx->num_actions++]; |
| |
| data = &priv->data; |
| switch (data->verdict.code) { |
| case NF_ACCEPT: |
| entry->id = FLOW_ACTION_ACCEPT; |
| break; |
| case NF_DROP: |
| entry->id = FLOW_ACTION_DROP; |
| break; |
| default: |
| return -EOPNOTSUPP; |
| } |
| |
| return 0; |
| } |
| |
| static int nft_immediate_offload(struct nft_offload_ctx *ctx, |
| struct nft_flow_rule *flow, |
| const struct nft_expr *expr) |
| { |
| const struct nft_immediate_expr *priv = nft_expr_priv(expr); |
| |
| if (priv->dreg == NFT_REG_VERDICT) |
| return nft_immediate_offload_verdict(ctx, flow, priv); |
| |
| memcpy(&ctx->regs[priv->dreg].data, &priv->data, sizeof(priv->data)); |
| |
| return 0; |
| } |
| |
| static bool nft_immediate_offload_action(const struct nft_expr *expr) |
| { |
| const struct nft_immediate_expr *priv = nft_expr_priv(expr); |
| |
| if (priv->dreg == NFT_REG_VERDICT) |
| return true; |
| |
| return false; |
| } |
| |
| static bool nft_immediate_reduce(struct nft_regs_track *track, |
| const struct nft_expr *expr) |
| { |
| const struct nft_immediate_expr *priv = nft_expr_priv(expr); |
| |
| if (priv->dreg != NFT_REG_VERDICT) |
| nft_reg_track_cancel(track, priv->dreg, priv->dlen); |
| |
| return false; |
| } |
| |
| static const struct nft_expr_ops nft_imm_ops = { |
| .type = &nft_imm_type, |
| .size = NFT_EXPR_SIZE(sizeof(struct nft_immediate_expr)), |
| .eval = nft_immediate_eval, |
| .init = nft_immediate_init, |
| .activate = nft_immediate_activate, |
| .deactivate = nft_immediate_deactivate, |
| .destroy = nft_immediate_destroy, |
| .dump = nft_immediate_dump, |
| .validate = nft_immediate_validate, |
| .reduce = nft_immediate_reduce, |
| .offload = nft_immediate_offload, |
| .offload_action = nft_immediate_offload_action, |
| }; |
| |
| struct nft_expr_type nft_imm_type __read_mostly = { |
| .name = "immediate", |
| .ops = &nft_imm_ops, |
| .policy = nft_immediate_policy, |
| .maxattr = NFTA_IMMEDIATE_MAX, |
| .owner = THIS_MODULE, |
| }; |