/* * net/sched/cls_matchll.c Match-all classifier * * Copyright (c) 2016 Jiri Pirko * * 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 #include #include #include #include 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; 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; 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 }, }; 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; err = tcf_exts_init(&e, TCA_MATCHALL_ACT, 0); if (err) return err; err = tcf_exts_validate(net, tp, tb, est, &e, ovr); if (err < 0) goto errout; 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; errout: tcf_exts_destroy(&e); return err; } 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; err = tcf_exts_init(&new->exts, TCA_MATCHALL_ACT, 0); if (err) goto err_exts_init; 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 err_set_parms; 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 err_replace_hw_filter; else err = 0; } } *arg = (unsigned long) head; rcu_assign_pointer(tp->root, new); if (head) call_rcu(&head->rcu, mall_destroy_rcu); return 0; err_replace_hw_filter: err_set_parms: tcf_exts_destroy(&new->exts); err_exts_init: 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 "); MODULE_DESCRIPTION("Match-all classifier"); MODULE_LICENSE("GPL v2"); 2efe9d4a354153e99d86a16af08'>Diffstat (limited to 'tools')