2019-07-09 23:00:43 +02:00
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/* SPDX-License-Identifier: GPL-2.0 */
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/netfilter.h>
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#include <net/flow_offload.h>
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#include <net/netfilter/nf_tables.h>
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#include <net/netfilter/nf_tables_offload.h>
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#include <net/pkt_cls.h>
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static struct nft_flow_rule *nft_flow_rule_alloc(int num_actions)
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{
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struct nft_flow_rule *flow;
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flow = kzalloc(sizeof(struct nft_flow_rule), GFP_KERNEL);
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if (!flow)
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return NULL;
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flow->rule = flow_rule_alloc(num_actions);
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if (!flow->rule) {
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kfree(flow);
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return NULL;
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}
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flow->rule->match.dissector = &flow->match.dissector;
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flow->rule->match.mask = &flow->match.mask;
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flow->rule->match.key = &flow->match.key;
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return flow;
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}
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struct nft_flow_rule *nft_flow_rule_create(const struct nft_rule *rule)
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{
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struct nft_offload_ctx ctx = {
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.dep = {
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.type = NFT_OFFLOAD_DEP_UNSPEC,
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},
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};
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struct nft_flow_rule *flow;
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int num_actions = 0, err;
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struct nft_expr *expr;
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expr = nft_expr_first(rule);
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while (expr->ops && expr != nft_expr_last(rule)) {
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if (expr->ops->offload_flags & NFT_OFFLOAD_F_ACTION)
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num_actions++;
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expr = nft_expr_next(expr);
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}
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flow = nft_flow_rule_alloc(num_actions);
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if (!flow)
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return ERR_PTR(-ENOMEM);
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expr = nft_expr_first(rule);
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while (expr->ops && expr != nft_expr_last(rule)) {
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if (!expr->ops->offload) {
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err = -EOPNOTSUPP;
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goto err_out;
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}
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err = expr->ops->offload(&ctx, flow, expr);
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if (err < 0)
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goto err_out;
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expr = nft_expr_next(expr);
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}
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flow->proto = ctx.dep.l3num;
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return flow;
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err_out:
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nft_flow_rule_destroy(flow);
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return ERR_PTR(err);
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}
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void nft_flow_rule_destroy(struct nft_flow_rule *flow)
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{
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kfree(flow->rule);
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kfree(flow);
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}
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void nft_offload_set_dependency(struct nft_offload_ctx *ctx,
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enum nft_offload_dep_type type)
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{
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ctx->dep.type = type;
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}
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void nft_offload_update_dependency(struct nft_offload_ctx *ctx,
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const void *data, u32 len)
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{
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switch (ctx->dep.type) {
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case NFT_OFFLOAD_DEP_NETWORK:
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WARN_ON(len != sizeof(__u16));
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memcpy(&ctx->dep.l3num, data, sizeof(__u16));
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break;
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case NFT_OFFLOAD_DEP_TRANSPORT:
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WARN_ON(len != sizeof(__u8));
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memcpy(&ctx->dep.protonum, data, sizeof(__u8));
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break;
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default:
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break;
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}
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ctx->dep.type = NFT_OFFLOAD_DEP_UNSPEC;
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}
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static void nft_flow_offload_common_init(struct flow_cls_common_offload *common,
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__be16 proto,
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struct netlink_ext_ack *extack)
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{
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common->protocol = proto;
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common->extack = extack;
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}
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static int nft_setup_cb_call(struct nft_base_chain *basechain,
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enum tc_setup_type type, void *type_data)
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{
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struct flow_block_cb *block_cb;
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int err;
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2019-07-19 18:20:16 +02:00
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list_for_each_entry(block_cb, &basechain->flow_block.cb_list, list) {
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2019-07-09 23:00:43 +02:00
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err = block_cb->cb(type, type_data, block_cb->cb_priv);
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if (err < 0)
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return err;
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}
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return 0;
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}
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static int nft_flow_offload_rule(struct nft_trans *trans,
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enum flow_cls_command command)
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{
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struct nft_flow_rule *flow = nft_trans_flow_rule(trans);
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struct nft_rule *rule = nft_trans_rule(trans);
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struct flow_cls_offload cls_flow = {};
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struct nft_base_chain *basechain;
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struct netlink_ext_ack extack;
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__be16 proto = ETH_P_ALL;
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if (!nft_is_base_chain(trans->ctx.chain))
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return -EOPNOTSUPP;
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basechain = nft_base_chain(trans->ctx.chain);
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if (flow)
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proto = flow->proto;
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nft_flow_offload_common_init(&cls_flow.common, proto, &extack);
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cls_flow.command = command;
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cls_flow.cookie = (unsigned long) rule;
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if (flow)
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cls_flow.rule = flow->rule;
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return nft_setup_cb_call(basechain, TC_SETUP_CLSFLOWER, &cls_flow);
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}
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static int nft_flow_offload_bind(struct flow_block_offload *bo,
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struct nft_base_chain *basechain)
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{
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2019-07-19 18:20:16 +02:00
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list_splice(&bo->cb_list, &basechain->flow_block.cb_list);
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2019-07-09 23:00:43 +02:00
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return 0;
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}
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static int nft_flow_offload_unbind(struct flow_block_offload *bo,
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struct nft_base_chain *basechain)
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{
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struct flow_block_cb *block_cb, *next;
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list_for_each_entry_safe(block_cb, next, &bo->cb_list, list) {
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list_del(&block_cb->list);
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flow_block_cb_free(block_cb);
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}
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return 0;
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}
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#define FLOW_SETUP_BLOCK TC_SETUP_BLOCK
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static int nft_flow_offload_chain(struct nft_trans *trans,
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enum flow_block_command cmd)
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{
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struct nft_chain *chain = trans->ctx.chain;
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struct netlink_ext_ack extack = {};
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struct flow_block_offload bo = {};
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struct nft_base_chain *basechain;
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struct net_device *dev;
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int err;
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if (!nft_is_base_chain(chain))
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return -EOPNOTSUPP;
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basechain = nft_base_chain(chain);
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dev = basechain->ops.dev;
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if (!dev || !dev->netdev_ops->ndo_setup_tc)
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return -EOPNOTSUPP;
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/* Only default policy to accept is supported for now. */
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if (cmd == FLOW_BLOCK_BIND &&
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nft_trans_chain_policy(trans) != -1 &&
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nft_trans_chain_policy(trans) != NF_ACCEPT)
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return -EOPNOTSUPP;
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bo.command = cmd;
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2019-07-19 18:20:16 +02:00
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bo.block = &basechain->flow_block;
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2019-07-09 23:00:43 +02:00
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bo.binder_type = FLOW_BLOCK_BINDER_TYPE_CLSACT_INGRESS;
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bo.extack = &extack;
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INIT_LIST_HEAD(&bo.cb_list);
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err = dev->netdev_ops->ndo_setup_tc(dev, FLOW_SETUP_BLOCK, &bo);
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if (err < 0)
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return err;
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switch (cmd) {
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case FLOW_BLOCK_BIND:
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err = nft_flow_offload_bind(&bo, basechain);
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break;
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case FLOW_BLOCK_UNBIND:
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err = nft_flow_offload_unbind(&bo, basechain);
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break;
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}
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return err;
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}
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int nft_flow_rule_offload_commit(struct net *net)
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{
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struct nft_trans *trans;
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int err = 0;
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list_for_each_entry(trans, &net->nft.commit_list, list) {
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if (trans->ctx.family != NFPROTO_NETDEV)
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continue;
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switch (trans->msg_type) {
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case NFT_MSG_NEWCHAIN:
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if (!(trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD))
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continue;
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err = nft_flow_offload_chain(trans, FLOW_BLOCK_BIND);
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break;
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case NFT_MSG_DELCHAIN:
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if (!(trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD))
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continue;
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err = nft_flow_offload_chain(trans, FLOW_BLOCK_UNBIND);
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break;
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case NFT_MSG_NEWRULE:
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if (!(trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD))
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continue;
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if (trans->ctx.flags & NLM_F_REPLACE ||
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!(trans->ctx.flags & NLM_F_APPEND))
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return -EOPNOTSUPP;
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err = nft_flow_offload_rule(trans, FLOW_CLS_REPLACE);
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nft_flow_rule_destroy(nft_trans_flow_rule(trans));
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break;
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case NFT_MSG_DELRULE:
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if (!(trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD))
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continue;
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err = nft_flow_offload_rule(trans, FLOW_CLS_DESTROY);
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break;
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}
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if (err)
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return err;
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}
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return err;
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}
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