| /* |
| * net/sched/cls_matchll.c Match-all classifier |
| * |
| * Copyright (c) 2016 Jiri Pirko <jiri@mellanox.com> |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| */ |
| |
| #include <linux/kernel.h> |
| #include <linux/init.h> |
| #include <linux/module.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; |
| struct rcu_head rcu; |
| }; |
| |
| 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 (tc_skip_sw(head->flags)) |
| return -1; |
| |
| *res = head->res; |
| return tcf_exts_exec(skb, &head->exts, res); |
| } |
| |
| static int mall_init(struct tcf_proto *tp) |
| { |
| return 0; |
| } |
| |
| static void mall_destroy_rcu(struct rcu_head *rcu) |
| { |
| struct cls_mall_head *head = container_of(rcu, struct cls_mall_head, |
| rcu); |
| |
| tcf_exts_destroy(&head->exts); |
| kfree(head); |
| } |
| |
| static int mall_replace_hw_filter(struct tcf_proto *tp, |
| struct cls_mall_head *head, |
| unsigned long cookie) |
| { |
| struct net_device *dev = tp->q->dev_queue->dev; |
| struct tc_to_netdev offload; |
| struct tc_cls_matchall_offload mall_offload = {0}; |
| |
| offload.type = TC_SETUP_MATCHALL; |
| offload.cls_mall = &mall_offload; |
| offload.cls_mall->command = TC_CLSMATCHALL_REPLACE; |
| offload.cls_mall->exts = &head->exts; |
| offload.cls_mall->cookie = cookie; |
| |
| return dev->netdev_ops->ndo_setup_tc(dev, tp->q->handle, tp->protocol, |
| &offload); |
| } |
| |
| static void mall_destroy_hw_filter(struct tcf_proto *tp, |
| struct cls_mall_head *head, |
| unsigned long cookie) |
| { |
| struct net_device *dev = tp->q->dev_queue->dev; |
| struct tc_to_netdev offload; |
| struct tc_cls_matchall_offload mall_offload = {0}; |
| |
| offload.type = TC_SETUP_MATCHALL; |
| offload.cls_mall = &mall_offload; |
| offload.cls_mall->command = TC_CLSMATCHALL_DESTROY; |
| offload.cls_mall->exts = NULL; |
| offload.cls_mall->cookie = cookie; |
| |
| dev->netdev_ops->ndo_setup_tc(dev, tp->q->handle, tp->protocol, |
| &offload); |
| } |
| |
| static bool mall_destroy(struct tcf_proto *tp, bool force) |
| { |
| struct cls_mall_head *head = rtnl_dereference(tp->root); |
| struct net_device *dev = tp->q->dev_queue->dev; |
| |
| if (!head) |
| return true; |
| |
| tcf_unbind_filter(tp, &head->res); |
| |
| if (tc_should_offload(dev, tp, head->flags)) |
| mall_destroy_hw_filter(tp, head, (unsigned long) head); |
| |
| call_rcu(&head->rcu, mall_destroy_rcu); |
| return true; |
| } |
| |
| static unsigned long mall_get(struct tcf_proto *tp, u32 handle) |
| { |
| return 0UL; |
| } |
| |
| static const struct nla_policy mall_policy[TCA_MATCHALL_MAX + 1] = { |
| [TCA_MATCHALL_UNSPEC] = { .type = NLA_UNSPEC }, |
| [TCA_MATCHALL_CLASSID] = { .type = NLA_U32 }, |
| [TCA_MATCHALL_FLAGS] = { .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 tcf_exts e; |
| int err; |
| |
| tcf_exts_init(&e, TCA_MATCHALL_ACT, 0); |
| err = tcf_exts_validate(net, tp, tb, est, &e, ovr); |
| 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); |
| } |
| |
| tcf_exts_change(tp, &head->exts, &e); |
| |
| 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, |
| unsigned long *arg, bool ovr) |
| { |
| struct cls_mall_head *head = rtnl_dereference(tp->root); |
| struct net_device *dev = tp->q->dev_queue->dev; |
| 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(tb, TCA_MATCHALL_MAX, |
| tca[TCA_OPTIONS], mall_policy); |
| 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; |
| |
| tcf_exts_init(&new->exts, TCA_MATCHALL_ACT, 0); |
| |
| if (!handle) |
| handle = 1; |
| new->handle = handle; |
| new->flags = flags; |
| |
| err = mall_set_parms(net, tp, new, base, tb, tca[TCA_RATE], ovr); |
| if (err) |
| goto errout; |
| |
| if (tc_should_offload(dev, tp, flags)) { |
| err = mall_replace_hw_filter(tp, new, (unsigned long) new); |
| if (err) { |
| if (tc_skip_sw(flags)) |
| goto errout; |
| else |
| err = 0; |
| } |
| } |
| |
| *arg = (unsigned long) head; |
| rcu_assign_pointer(tp->root, new); |
| if (head) |
| call_rcu(&head->rcu, mall_destroy_rcu); |
| return 0; |
| |
| errout: |
| kfree(new); |
| return err; |
| } |
| |
| static int mall_delete(struct tcf_proto *tp, unsigned long arg) |
| { |
| return -EOPNOTSUPP; |
| } |
| |
| static void mall_walk(struct tcf_proto *tp, struct tcf_walker *arg) |
| { |
| struct cls_mall_head *head = rtnl_dereference(tp->root); |
| |
| if (arg->count < arg->skip) |
| goto skip; |
| if (arg->fn(tp, (unsigned long) head, arg) < 0) |
| arg->stop = 1; |
| skip: |
| arg->count++; |
| } |
| |
| static int mall_dump(struct net *net, struct tcf_proto *tp, unsigned long fh, |
| struct sk_buff *skb, struct tcmsg *t) |
| { |
| struct cls_mall_head *head = (struct cls_mall_head *) fh; |
| struct nlattr *nest; |
| |
| if (!head) |
| return skb->len; |
| |
| t->tcm_handle = head->handle; |
| |
| nest = nla_nest_start(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 (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 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, |
| .dump = mall_dump, |
| .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"); |