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443 lines
10 KiB
443 lines
10 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* net/sched/cls_matchll.c Match-all classifier |
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* |
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* Copyright (c) 2016 Jiri Pirko <[email protected]> |
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*/ |
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#include <linux/kernel.h> |
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#include <linux/init.h> |
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#include <linux/module.h> |
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#include <linux/percpu.h> |
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#include <net/sch_generic.h> |
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#include <net/pkt_cls.h> |
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struct cls_mall_head { |
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struct tcf_exts exts; |
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struct tcf_result res; |
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u32 handle; |
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u32 flags; |
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unsigned int in_hw_count; |
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struct tc_matchall_pcnt __percpu *pf; |
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struct rcu_work rwork; |
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bool deleting; |
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}; |
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static int mall_classify(struct sk_buff *skb, const struct tcf_proto *tp, |
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struct tcf_result *res) |
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{ |
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struct cls_mall_head *head = rcu_dereference_bh(tp->root); |
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if (unlikely(!head)) |
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return -1; |
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if (tc_skip_sw(head->flags)) |
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return -1; |
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*res = head->res; |
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__this_cpu_inc(head->pf->rhit); |
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return tcf_exts_exec(skb, &head->exts, res); |
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} |
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static int mall_init(struct tcf_proto *tp) |
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{ |
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return 0; |
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} |
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static void __mall_destroy(struct cls_mall_head *head) |
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{ |
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tcf_exts_destroy(&head->exts); |
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tcf_exts_put_net(&head->exts); |
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free_percpu(head->pf); |
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kfree(head); |
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} |
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static void mall_destroy_work(struct work_struct *work) |
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{ |
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struct cls_mall_head *head = container_of(to_rcu_work(work), |
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struct cls_mall_head, |
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rwork); |
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rtnl_lock(); |
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__mall_destroy(head); |
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rtnl_unlock(); |
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} |
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static void mall_destroy_hw_filter(struct tcf_proto *tp, |
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struct cls_mall_head *head, |
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unsigned long cookie, |
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struct netlink_ext_ack *extack) |
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{ |
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struct tc_cls_matchall_offload cls_mall = {}; |
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struct tcf_block *block = tp->chain->block; |
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tc_cls_common_offload_init(&cls_mall.common, tp, head->flags, extack); |
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cls_mall.command = TC_CLSMATCHALL_DESTROY; |
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cls_mall.cookie = cookie; |
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tc_setup_cb_destroy(block, tp, TC_SETUP_CLSMATCHALL, &cls_mall, false, |
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&head->flags, &head->in_hw_count, true); |
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} |
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static int mall_replace_hw_filter(struct tcf_proto *tp, |
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struct cls_mall_head *head, |
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unsigned long cookie, |
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struct netlink_ext_ack *extack) |
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{ |
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struct tc_cls_matchall_offload cls_mall = {}; |
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struct tcf_block *block = tp->chain->block; |
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bool skip_sw = tc_skip_sw(head->flags); |
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int err; |
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cls_mall.rule = flow_rule_alloc(tcf_exts_num_actions(&head->exts)); |
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if (!cls_mall.rule) |
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return -ENOMEM; |
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tc_cls_common_offload_init(&cls_mall.common, tp, head->flags, extack); |
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cls_mall.command = TC_CLSMATCHALL_REPLACE; |
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cls_mall.cookie = cookie; |
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err = tc_setup_offload_action(&cls_mall.rule->action, &head->exts); |
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if (err) { |
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kfree(cls_mall.rule); |
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mall_destroy_hw_filter(tp, head, cookie, NULL); |
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if (skip_sw) |
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NL_SET_ERR_MSG_MOD(extack, "Failed to setup flow action"); |
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else |
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err = 0; |
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return err; |
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} |
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err = tc_setup_cb_add(block, tp, TC_SETUP_CLSMATCHALL, &cls_mall, |
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skip_sw, &head->flags, &head->in_hw_count, true); |
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tc_cleanup_offload_action(&cls_mall.rule->action); |
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kfree(cls_mall.rule); |
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if (err) { |
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mall_destroy_hw_filter(tp, head, cookie, NULL); |
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return err; |
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} |
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if (skip_sw && !(head->flags & TCA_CLS_FLAGS_IN_HW)) |
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return -EINVAL; |
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return 0; |
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} |
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static void mall_destroy(struct tcf_proto *tp, bool rtnl_held, |
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struct netlink_ext_ack *extack) |
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{ |
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struct cls_mall_head *head = rtnl_dereference(tp->root); |
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if (!head) |
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return; |
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tcf_unbind_filter(tp, &head->res); |
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if (!tc_skip_hw(head->flags)) |
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mall_destroy_hw_filter(tp, head, (unsigned long) head, extack); |
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if (tcf_exts_get_net(&head->exts)) |
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tcf_queue_work(&head->rwork, mall_destroy_work); |
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else |
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__mall_destroy(head); |
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} |
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static void *mall_get(struct tcf_proto *tp, u32 handle) |
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{ |
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struct cls_mall_head *head = rtnl_dereference(tp->root); |
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if (head && head->handle == handle) |
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return head; |
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return NULL; |
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} |
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static const struct nla_policy mall_policy[TCA_MATCHALL_MAX + 1] = { |
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[TCA_MATCHALL_UNSPEC] = { .type = NLA_UNSPEC }, |
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[TCA_MATCHALL_CLASSID] = { .type = NLA_U32 }, |
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[TCA_MATCHALL_FLAGS] = { .type = NLA_U32 }, |
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}; |
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static int mall_set_parms(struct net *net, struct tcf_proto *tp, |
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struct cls_mall_head *head, |
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unsigned long base, struct nlattr **tb, |
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struct nlattr *est, u32 flags, u32 fl_flags, |
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struct netlink_ext_ack *extack) |
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{ |
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int err; |
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err = tcf_exts_validate_ex(net, tp, tb, est, &head->exts, flags, |
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fl_flags, extack); |
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if (err < 0) |
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return err; |
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if (tb[TCA_MATCHALL_CLASSID]) { |
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head->res.classid = nla_get_u32(tb[TCA_MATCHALL_CLASSID]); |
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tcf_bind_filter(tp, &head->res, base); |
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} |
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return 0; |
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} |
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static int mall_change(struct net *net, struct sk_buff *in_skb, |
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struct tcf_proto *tp, unsigned long base, |
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u32 handle, struct nlattr **tca, |
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void **arg, u32 flags, |
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struct netlink_ext_ack *extack) |
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{ |
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struct cls_mall_head *head = rtnl_dereference(tp->root); |
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struct nlattr *tb[TCA_MATCHALL_MAX + 1]; |
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struct cls_mall_head *new; |
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u32 userflags = 0; |
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int err; |
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if (!tca[TCA_OPTIONS]) |
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return -EINVAL; |
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if (head) |
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return -EEXIST; |
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err = nla_parse_nested_deprecated(tb, TCA_MATCHALL_MAX, |
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tca[TCA_OPTIONS], mall_policy, NULL); |
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if (err < 0) |
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return err; |
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if (tb[TCA_MATCHALL_FLAGS]) { |
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userflags = nla_get_u32(tb[TCA_MATCHALL_FLAGS]); |
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if (!tc_flags_valid(userflags)) |
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return -EINVAL; |
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} |
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new = kzalloc(sizeof(*new), GFP_KERNEL); |
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if (!new) |
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return -ENOBUFS; |
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err = tcf_exts_init(&new->exts, net, TCA_MATCHALL_ACT, 0); |
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if (err) |
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goto err_exts_init; |
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if (!handle) |
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handle = 1; |
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new->handle = handle; |
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new->flags = userflags; |
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new->pf = alloc_percpu(struct tc_matchall_pcnt); |
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if (!new->pf) { |
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err = -ENOMEM; |
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goto err_alloc_percpu; |
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} |
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err = mall_set_parms(net, tp, new, base, tb, tca[TCA_RATE], |
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flags, new->flags, extack); |
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if (err) |
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goto err_set_parms; |
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if (!tc_skip_hw(new->flags)) { |
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err = mall_replace_hw_filter(tp, new, (unsigned long)new, |
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extack); |
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if (err) |
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goto err_replace_hw_filter; |
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} |
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if (!tc_in_hw(new->flags)) |
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new->flags |= TCA_CLS_FLAGS_NOT_IN_HW; |
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*arg = head; |
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rcu_assign_pointer(tp->root, new); |
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return 0; |
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err_replace_hw_filter: |
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err_set_parms: |
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free_percpu(new->pf); |
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err_alloc_percpu: |
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tcf_exts_destroy(&new->exts); |
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err_exts_init: |
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kfree(new); |
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return err; |
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} |
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static int mall_delete(struct tcf_proto *tp, void *arg, bool *last, |
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bool rtnl_held, struct netlink_ext_ack *extack) |
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{ |
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struct cls_mall_head *head = rtnl_dereference(tp->root); |
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head->deleting = true; |
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*last = true; |
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return 0; |
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} |
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static void mall_walk(struct tcf_proto *tp, struct tcf_walker *arg, |
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bool rtnl_held) |
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{ |
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struct cls_mall_head *head = rtnl_dereference(tp->root); |
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if (arg->count < arg->skip) |
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goto skip; |
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if (!head || head->deleting) |
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return; |
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if (arg->fn(tp, head, arg) < 0) |
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arg->stop = 1; |
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skip: |
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arg->count++; |
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} |
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static int mall_reoffload(struct tcf_proto *tp, bool add, flow_setup_cb_t *cb, |
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void *cb_priv, struct netlink_ext_ack *extack) |
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{ |
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struct cls_mall_head *head = rtnl_dereference(tp->root); |
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struct tc_cls_matchall_offload cls_mall = {}; |
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struct tcf_block *block = tp->chain->block; |
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int err; |
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if (tc_skip_hw(head->flags)) |
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return 0; |
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cls_mall.rule = flow_rule_alloc(tcf_exts_num_actions(&head->exts)); |
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if (!cls_mall.rule) |
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return -ENOMEM; |
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tc_cls_common_offload_init(&cls_mall.common, tp, head->flags, extack); |
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cls_mall.command = add ? |
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TC_CLSMATCHALL_REPLACE : TC_CLSMATCHALL_DESTROY; |
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cls_mall.cookie = (unsigned long)head; |
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err = tc_setup_offload_action(&cls_mall.rule->action, &head->exts); |
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if (err) { |
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kfree(cls_mall.rule); |
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if (add && tc_skip_sw(head->flags)) { |
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NL_SET_ERR_MSG_MOD(extack, "Failed to setup flow action"); |
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return err; |
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} |
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return 0; |
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} |
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err = tc_setup_cb_reoffload(block, tp, add, cb, TC_SETUP_CLSMATCHALL, |
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&cls_mall, cb_priv, &head->flags, |
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&head->in_hw_count); |
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tc_cleanup_offload_action(&cls_mall.rule->action); |
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kfree(cls_mall.rule); |
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if (err) |
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return err; |
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return 0; |
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} |
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static void mall_stats_hw_filter(struct tcf_proto *tp, |
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struct cls_mall_head *head, |
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unsigned long cookie) |
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{ |
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struct tc_cls_matchall_offload cls_mall = {}; |
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struct tcf_block *block = tp->chain->block; |
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tc_cls_common_offload_init(&cls_mall.common, tp, head->flags, NULL); |
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cls_mall.command = TC_CLSMATCHALL_STATS; |
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cls_mall.cookie = cookie; |
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tc_setup_cb_call(block, TC_SETUP_CLSMATCHALL, &cls_mall, false, true); |
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tcf_exts_hw_stats_update(&head->exts, cls_mall.stats.bytes, |
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cls_mall.stats.pkts, cls_mall.stats.drops, |
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cls_mall.stats.lastused, |
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cls_mall.stats.used_hw_stats, |
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cls_mall.stats.used_hw_stats_valid); |
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} |
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static int mall_dump(struct net *net, struct tcf_proto *tp, void *fh, |
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struct sk_buff *skb, struct tcmsg *t, bool rtnl_held) |
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{ |
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struct tc_matchall_pcnt gpf = {}; |
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struct cls_mall_head *head = fh; |
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struct nlattr *nest; |
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int cpu; |
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if (!head) |
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return skb->len; |
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if (!tc_skip_hw(head->flags)) |
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mall_stats_hw_filter(tp, head, (unsigned long)head); |
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t->tcm_handle = head->handle; |
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nest = nla_nest_start_noflag(skb, TCA_OPTIONS); |
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if (!nest) |
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goto nla_put_failure; |
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if (head->res.classid && |
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nla_put_u32(skb, TCA_MATCHALL_CLASSID, head->res.classid)) |
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goto nla_put_failure; |
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if (head->flags && nla_put_u32(skb, TCA_MATCHALL_FLAGS, head->flags)) |
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goto nla_put_failure; |
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for_each_possible_cpu(cpu) { |
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struct tc_matchall_pcnt *pf = per_cpu_ptr(head->pf, cpu); |
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gpf.rhit += pf->rhit; |
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} |
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if (nla_put_64bit(skb, TCA_MATCHALL_PCNT, |
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sizeof(struct tc_matchall_pcnt), |
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&gpf, TCA_MATCHALL_PAD)) |
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goto nla_put_failure; |
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if (tcf_exts_dump(skb, &head->exts)) |
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goto nla_put_failure; |
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nla_nest_end(skb, nest); |
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if (tcf_exts_dump_stats(skb, &head->exts) < 0) |
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goto nla_put_failure; |
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return skb->len; |
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nla_put_failure: |
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nla_nest_cancel(skb, nest); |
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return -1; |
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} |
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static void mall_bind_class(void *fh, u32 classid, unsigned long cl, void *q, |
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unsigned long base) |
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{ |
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struct cls_mall_head *head = fh; |
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if (head && head->res.classid == classid) { |
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if (cl) |
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__tcf_bind_filter(q, &head->res, base); |
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else |
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__tcf_unbind_filter(q, &head->res); |
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} |
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} |
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static struct tcf_proto_ops cls_mall_ops __read_mostly = { |
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.kind = "matchall", |
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.classify = mall_classify, |
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.init = mall_init, |
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.destroy = mall_destroy, |
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.get = mall_get, |
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.change = mall_change, |
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.delete = mall_delete, |
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.walk = mall_walk, |
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.reoffload = mall_reoffload, |
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.dump = mall_dump, |
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.bind_class = mall_bind_class, |
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.owner = THIS_MODULE, |
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}; |
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static int __init cls_mall_init(void) |
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{ |
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return register_tcf_proto_ops(&cls_mall_ops); |
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} |
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static void __exit cls_mall_exit(void) |
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{ |
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unregister_tcf_proto_ops(&cls_mall_ops); |
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} |
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module_init(cls_mall_init); |
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module_exit(cls_mall_exit); |
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MODULE_AUTHOR("Jiri Pirko <[email protected]>"); |
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MODULE_DESCRIPTION("Match-all classifier"); |
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MODULE_LICENSE("GPL v2");
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