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