300 lines
6.7 KiB
C
300 lines
6.7 KiB
C
/*
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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 <jiri@mellanox.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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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 <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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struct rcu_head rcu;
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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 (tc_skip_sw(head->flags))
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return -1;
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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_rcu(struct rcu_head *rcu)
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{
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struct cls_mall_head *head = container_of(rcu, struct cls_mall_head,
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rcu);
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tcf_exts_destroy(&head->exts);
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kfree(head);
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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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{
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struct net_device *dev = tp->q->dev_queue->dev;
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struct tc_to_netdev offload;
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struct tc_cls_matchall_offload mall_offload = {0};
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int err;
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offload.type = TC_SETUP_MATCHALL;
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offload.cls_mall = &mall_offload;
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offload.cls_mall->command = TC_CLSMATCHALL_REPLACE;
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offload.cls_mall->exts = &head->exts;
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offload.cls_mall->cookie = cookie;
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err = dev->netdev_ops->ndo_setup_tc(dev, tp->q->handle, tp->protocol,
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&offload);
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if (!err)
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head->flags |= TCA_CLS_FLAGS_IN_HW;
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return err;
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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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{
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struct net_device *dev = tp->q->dev_queue->dev;
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struct tc_to_netdev offload;
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struct tc_cls_matchall_offload mall_offload = {0};
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offload.type = TC_SETUP_MATCHALL;
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offload.cls_mall = &mall_offload;
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offload.cls_mall->command = TC_CLSMATCHALL_DESTROY;
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offload.cls_mall->exts = NULL;
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offload.cls_mall->cookie = cookie;
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dev->netdev_ops->ndo_setup_tc(dev, tp->q->handle, tp->protocol,
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&offload);
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}
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static void mall_destroy(struct tcf_proto *tp)
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{
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struct cls_mall_head *head = rtnl_dereference(tp->root);
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struct net_device *dev = tp->q->dev_queue->dev;
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if (!head)
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return;
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if (tc_should_offload(dev, tp, head->flags))
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mall_destroy_hw_filter(tp, head, (unsigned long) head);
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call_rcu(&head->rcu, mall_destroy_rcu);
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}
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static unsigned long mall_get(struct tcf_proto *tp, u32 handle)
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{
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return 0UL;
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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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};
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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, bool ovr)
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{
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struct tcf_exts e;
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int err;
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err = tcf_exts_init(&e, TCA_MATCHALL_ACT, 0);
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if (err)
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return err;
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err = tcf_exts_validate(net, tp, tb, est, &e, ovr);
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if (err < 0)
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goto errout;
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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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tcf_exts_change(tp, &head->exts, &e);
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return 0;
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errout:
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tcf_exts_destroy(&e);
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return err;
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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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unsigned long *arg, bool ovr)
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{
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struct cls_mall_head *head = rtnl_dereference(tp->root);
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struct net_device *dev = tp->q->dev_queue->dev;
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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 flags = 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(tb, TCA_MATCHALL_MAX, tca[TCA_OPTIONS],
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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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flags = nla_get_u32(tb[TCA_MATCHALL_FLAGS]);
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if (!tc_flags_valid(flags))
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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, 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 = flags;
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err = mall_set_parms(net, tp, new, base, tb, tca[TCA_RATE], ovr);
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if (err)
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goto err_set_parms;
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if (tc_should_offload(dev, tp, flags)) {
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err = mall_replace_hw_filter(tp, new, (unsigned long) new);
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if (err) {
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if (tc_skip_sw(flags))
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goto err_replace_hw_filter;
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else
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err = 0;
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}
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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 = (unsigned long) head;
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rcu_assign_pointer(tp->root, new);
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call_rcu(&head->rcu, mall_destroy_rcu);
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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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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, unsigned long arg, bool *last)
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{
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return -EOPNOTSUPP;
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}
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static void mall_walk(struct tcf_proto *tp, struct tcf_walker *arg)
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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 (arg->fn(tp, (unsigned long) 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_dump(struct net *net, struct tcf_proto *tp, unsigned long fh,
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struct sk_buff *skb, struct tcmsg *t)
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{
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struct cls_mall_head *head = (struct cls_mall_head *) fh;
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struct nlattr *nest;
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if (!head)
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return skb->len;
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t->tcm_handle = head->handle;
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nest = nla_nest_start(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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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 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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.dump = mall_dump,
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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 <jiri@mellanox.com>");
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MODULE_DESCRIPTION("Match-all classifier");
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MODULE_LICENSE("GPL v2");
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