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Release 4.11 net/sched/cls_basic.c

Directory: net/sched
/*
 * net/sched/cls_basic.c        Basic Packet Classifier.
 *
 *              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.
 *
 * Authors:     Thomas Graf <tgraf@suug.ch>
 */

#include <linux/module.h>
#include <linux/slab.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/rtnetlink.h>
#include <linux/skbuff.h>
#include <net/netlink.h>
#include <net/act_api.h>
#include <net/pkt_cls.h>


struct basic_head {
	
u32			hgenerator;
	
struct list_head	flist;
	
struct rcu_head		rcu;
};


struct basic_filter {
	
u32			handle;
	
struct tcf_exts		exts;
	
struct tcf_ematch_tree	ematches;
	
struct tcf_result	res;
	
struct tcf_proto	*tp;
	
struct list_head	link;
	
struct rcu_head		rcu;
};


static int basic_classify(struct sk_buff *skb, const struct tcf_proto *tp, struct tcf_result *res) { int r; struct basic_head *head = rcu_dereference_bh(tp->root); struct basic_filter *f; list_for_each_entry_rcu(f, &head->flist, link) { if (!tcf_em_tree_match(skb, &f->ematches, NULL)) continue; *res = f->res; r = tcf_exts_exec(skb, &f->exts, res); if (r < 0) continue; return r; } return -1; }

Contributors

PersonTokensPropCommitsCommitProp
David S. Miller9895.15%133.33%
John Fastabend43.88%133.33%
Eric Dumazet10.97%133.33%
Total103100.00%3100.00%


static unsigned long basic_get(struct tcf_proto *tp, u32 handle) { unsigned long l = 0UL; struct basic_head *head = rtnl_dereference(tp->root); struct basic_filter *f; list_for_each_entry(f, &head->flist, link) { if (f->handle == handle) { l = (unsigned long) f; break; } } return l; }

Contributors

PersonTokensPropCommitsCommitProp
David S. Miller6288.57%133.33%
Daniel Borkmann57.14%133.33%
John Fastabend34.29%133.33%
Total70100.00%3100.00%


static int basic_init(struct tcf_proto *tp) { struct basic_head *head; head = kzalloc(sizeof(*head), GFP_KERNEL); if (head == NULL) return -ENOBUFS; INIT_LIST_HEAD(&head->flist); rcu_assign_pointer(tp->root, head); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Patrick McHardy4169.49%133.33%
David S. Miller1423.73%133.33%
John Fastabend46.78%133.33%
Total59100.00%3100.00%


static void basic_delete_filter(struct rcu_head *head) { struct basic_filter *f = container_of(head, struct basic_filter, rcu); tcf_exts_destroy(&f->exts); tcf_em_tree_destroy(&f->ematches); kfree(f); }

Contributors

PersonTokensPropCommitsCommitProp
David S. Miller3268.09%150.00%
John Fastabend1531.91%150.00%
Total47100.00%2100.00%


static bool basic_destroy(struct tcf_proto *tp, bool force) { struct basic_head *head = rtnl_dereference(tp->root); struct basic_filter *f, *n; if (!force && !list_empty(&head->flist)) return false; list_for_each_entry_safe(f, n, &head->flist, link) { list_del_rcu(&f->link); tcf_unbind_filter(tp, &f->res); call_rcu(&f->rcu, basic_delete_filter); } kfree_rcu(head, rcu); return true; }

Contributors

PersonTokensPropCommitsCommitProp
David S. Miller4645.54%120.00%
John Fastabend2726.73%240.00%
Cong Wang2423.76%120.00%
Patrick McHardy43.96%120.00%
Total101100.00%5100.00%


static int basic_delete(struct tcf_proto *tp, unsigned long arg) { struct basic_filter *f = (struct basic_filter *) arg; list_del_rcu(&f->link); tcf_unbind_filter(tp, &f->res); call_rcu(&f->rcu, basic_delete_filter); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
David S. Miller3967.24%125.00%
John Fastabend1627.59%250.00%
Jiri Pirko35.17%125.00%
Total58100.00%4100.00%

static const struct nla_policy basic_policy[TCA_BASIC_MAX + 1] = { [TCA_BASIC_CLASSID] = { .type = NLA_U32 }, [TCA_BASIC_EMATCHES] = { .type = NLA_NESTED }, };
static int basic_set_parms(struct net *net, struct tcf_proto *tp, struct basic_filter *f, unsigned long base, struct nlattr **tb, struct nlattr *est, bool ovr) { int err; struct tcf_exts e; struct tcf_ematch_tree t; err = tcf_exts_init(&e, TCA_BASIC_ACT, TCA_BASIC_POLICE); if (err < 0) return err; err = tcf_exts_validate(net, tp, tb, est, &e, ovr); if (err < 0) goto errout; err = tcf_em_tree_validate(tp, tb[TCA_BASIC_EMATCHES], &t); if (err < 0) goto errout; if (tb[TCA_BASIC_CLASSID]) { f->res.classid = nla_get_u32(tb[TCA_BASIC_CLASSID]); tcf_bind_filter(tp, &f->res, base); } tcf_exts_change(tp, &f->exts, &e); tcf_em_tree_change(tp, &f->ematches, &t); f->tp = tp; return 0; errout: tcf_exts_destroy(&e); return err; }

Contributors

PersonTokensPropCommitsCommitProp
David S. Miller15877.83%112.50%
Américo Wang2411.82%225.00%
Benjamin LaHaise73.45%112.50%
John Fastabend62.96%112.50%
Cong Wang52.46%112.50%
Patrick McHardy31.48%225.00%
Total203100.00%8100.00%


static int basic_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) { int err; struct basic_head *head = rtnl_dereference(tp->root); struct nlattr *tb[TCA_BASIC_MAX + 1]; struct basic_filter *fold = (struct basic_filter *) *arg; struct basic_filter *fnew; if (tca[TCA_OPTIONS] == NULL) return -EINVAL; err = nla_parse_nested(tb, TCA_BASIC_MAX, tca[TCA_OPTIONS], basic_policy); if (err < 0) return err; if (fold != NULL) { if (handle && fold->handle != handle) return -EINVAL; } fnew = kzalloc(sizeof(*fnew), GFP_KERNEL); if (!fnew) return -ENOBUFS; err = tcf_exts_init(&fnew->exts, TCA_BASIC_ACT, TCA_BASIC_POLICE); if (err < 0) goto errout; err = -EINVAL; if (handle) { fnew->handle = handle; } else if (fold) { fnew->handle = fold->handle; } else { unsigned int i = 0x80000000; do { if (++head->hgenerator == 0x7FFFFFFF) head->hgenerator = 1; } while (--i > 0 && basic_get(tp, head->hgenerator)); if (i <= 0) { pr_err("Insufficient number of handles\n"); goto errout; } fnew->handle = head->hgenerator; } err = basic_set_parms(net, tp, fnew, base, tb, tca[TCA_RATE], ovr); if (err < 0) goto errout; *arg = (unsigned long)fnew; if (fold) { list_replace_rcu(&fold->link, &fnew->link); tcf_unbind_filter(tp, &fold->res); call_rcu(&fold->rcu, basic_delete_filter); } else { list_add_rcu(&fnew->link, &head->flist); } return 0; errout: tcf_exts_destroy(&fnew->exts); kfree(fnew); return err; }

Contributors

PersonTokensPropCommitsCommitProp
David S. Miller25161.82%16.25%
John Fastabend8621.18%212.50%
Américo Wang307.39%318.75%
Patrick McHardy143.45%318.75%
Benjamin LaHaise71.72%16.25%
Eric W. Biedermann51.23%16.25%
Cong Wang51.23%16.25%
Jiri Pirko51.23%16.25%
Kim Nordlund10.25%16.25%
Panagiotis Issaris10.25%16.25%
Eric Dumazet10.25%16.25%
Total406100.00%16100.00%


static void basic_walk(struct tcf_proto *tp, struct tcf_walker *arg) { struct basic_head *head = rtnl_dereference(tp->root); struct basic_filter *f; list_for_each_entry(f, &head->flist, link) { if (arg->count < arg->skip) goto skip; if (arg->fn(tp, (unsigned long) f, arg) < 0) { arg->stop = 1; break; } skip: arg->count++; } }

Contributors

PersonTokensPropCommitsCommitProp
David S. Miller8896.70%150.00%
John Fastabend33.30%150.00%
Total91100.00%2100.00%


static int basic_dump(struct net *net, struct tcf_proto *tp, unsigned long fh, struct sk_buff *skb, struct tcmsg *t) { struct basic_filter *f = (struct basic_filter *) fh; struct nlattr *nest; if (f == NULL) return skb->len; t->tcm_handle = f->handle; nest = nla_nest_start(skb, TCA_OPTIONS); if (nest == NULL) goto nla_put_failure; if (f->res.classid && nla_put_u32(skb, TCA_BASIC_CLASSID, f->res.classid)) goto nla_put_failure; if (tcf_exts_dump(skb, &f->exts) < 0 || tcf_em_tree_dump(skb, &f->ematches, TCA_BASIC_EMATCHES) < 0) goto nla_put_failure; nla_nest_end(skb, nest); if (tcf_exts_dump_stats(skb, &f->exts) < 0) goto nla_put_failure; return skb->len; nla_put_failure: nla_nest_cancel(skb, nest); return -1; }

Contributors

PersonTokensPropCommitsCommitProp
David S. Miller11965.75%225.00%
Patrick McHardy2011.05%225.00%
Thomas Graf189.94%112.50%
Stephen Hemminger179.39%112.50%
Américo Wang52.76%112.50%
Arnaldo Carvalho de Melo21.10%112.50%
Total181100.00%8100.00%

static struct tcf_proto_ops cls_basic_ops __read_mostly = { .kind = "basic", .classify = basic_classify, .init = basic_init, .destroy = basic_destroy, .get = basic_get, .change = basic_change, .delete = basic_delete, .walk = basic_walk, .dump = basic_dump, .owner = THIS_MODULE, };
static int __init init_basic(void) { return register_tcf_proto_ops(&cls_basic_ops); }

Contributors

PersonTokensPropCommitsCommitProp
David S. Miller16100.00%1100.00%
Total16100.00%1100.00%


static void __exit exit_basic(void) { unregister_tcf_proto_ops(&cls_basic_ops); }

Contributors

PersonTokensPropCommitsCommitProp
David S. Miller15100.00%1100.00%
Total15100.00%1100.00%

module_init(init_basic) module_exit(exit_basic) MODULE_LICENSE("GPL");

Overall Contributors

PersonTokensPropCommitsCommitProp
David S. Miller107269.66%26.25%
John Fastabend17711.50%26.25%
Patrick McHardy1187.67%825.00%
Américo Wang593.83%412.50%
Cong Wang342.21%26.25%
Thomas Graf181.17%13.12%
Stephen Hemminger171.10%13.12%
Benjamin LaHaise140.91%13.12%
Jiri Pirko80.52%26.25%
Eric W. Biedermann50.32%13.12%
Daniel Borkmann50.32%13.12%
Arnaldo Carvalho de Melo50.32%26.25%
Tejun Heo30.19%13.12%
Eric Dumazet20.13%26.25%
Panagiotis Issaris10.06%13.12%
Kim Nordlund10.06%13.12%
Total1539100.00%32100.00%
Directory: net/sched
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