cregit-Linux how code gets into the kernel

Release 4.14 net/sched/cls_fw.c

Directory: net/sched
/*
 * net/sched/cls_fw.c   Classifier mapping ipchains' fwmark to traffic class.
 *
 *              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:     Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
 *
 * Changes:
 * Karlis Peisenieks <karlis@mt.lv> : 990415 : fw_walk off by one
 * Karlis Peisenieks <karlis@mt.lv> : 990415 : fw_delete killed all the filter (and kernel).
 * Alex <alex@pilotsoft.com> : 2004xxyy: Added Action extension
 *
 * JHS: We should remove the CONFIG_NET_CLS_IND from here
 * eventually when the meta match extension is made available
 *
 */

#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/skbuff.h>
#include <net/netlink.h>
#include <net/act_api.h>
#include <net/pkt_cls.h>


#define HTSIZE 256


struct fw_head {
	
u32			mask;
	
struct fw_filter __rcu	*ht[HTSIZE];
	
struct rcu_head		rcu;
};


struct fw_filter {
	
struct fw_filter __rcu	*next;
	
u32			id;
	
struct tcf_result	res;
#ifdef CONFIG_NET_CLS_IND
	
int			ifindex;
#endif /* CONFIG_NET_CLS_IND */
	
struct tcf_exts		exts;
	
struct tcf_proto	*tp;
	union {
		
struct work_struct	work;
		
struct rcu_head		rcu;
	};
};


static u32 fw_hash(u32 handle) { handle ^= (handle >> 16); handle ^= (handle >> 8); return handle % HTSIZE; }

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Thomas Graf1240.00%133.33%
Linus Torvalds (pre-git)1033.33%133.33%
Eric Dumazet826.67%133.33%
Total30100.00%3100.00%


static int fw_classify(struct sk_buff *skb, const struct tcf_proto *tp, struct tcf_result *res) { struct fw_head *head = rcu_dereference_bh(tp->root); struct fw_filter *f; int r; u32 id = skb->mark; if (head != NULL) { id &= head->mask; for (f = rcu_dereference_bh(head->ht[fw_hash(id)]); f; f = rcu_dereference_bh(f->next)) { if (f->id == id) { *res = f->res; #ifdef CONFIG_NET_CLS_IND if (!tcf_match_indev(skb, f->ifindex)) continue; #endif /* CONFIG_NET_CLS_IND */ r = tcf_exts_exec(skb, &f->exts, res); if (r < 0) continue; return r; } } } else { /* Old method: classify the packet using its skb mark. */ if (id && (TC_H_MAJ(id) == 0 || !(TC_H_MAJ(id ^ tp->q->handle)))) { res->classid = id; res->class = 0; return 0; } } return -1; }

Contributors

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Linus Torvalds (pre-git)13967.80%428.57%
Thomas Graf2512.20%321.43%
Jamal Hadi Salim2110.24%17.14%
John Fastabend94.39%17.14%
Patrick McHardy62.93%17.14%
David S. Miller20.98%17.14%
Américo Wang20.98%214.29%
Eric Dumazet10.49%17.14%
Total205100.00%14100.00%


static void *fw_get(struct tcf_proto *tp, u32 handle) { struct fw_head *head = rtnl_dereference(tp->root); struct fw_filter *f; if (head == NULL) return NULL; f = rtnl_dereference(head->ht[fw_hash(handle)]); for (; f; f = rtnl_dereference(f->next)) { if (f->id == handle) return f; } return NULL; }

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Linus Torvalds (pre-git)7081.40%250.00%
John Fastabend1213.95%125.00%
Américo Wang44.65%125.00%
Total86100.00%4100.00%


static int fw_init(struct tcf_proto *tp) { /* We don't allocate fw_head here, because in the old method * we don't need it at all. */ return 0; }

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Linus Torvalds (pre-git)1493.33%150.00%
Américo Wang16.67%150.00%
Total15100.00%2100.00%


static void __fw_delete_filter(struct fw_filter *f) { tcf_exts_destroy(&f->exts); tcf_exts_put_net(&f->exts); kfree(f); }

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Américo Wang32100.00%1100.00%
Total32100.00%1100.00%


static void fw_delete_filter_work(struct work_struct *work) { struct fw_filter *f = container_of(work, struct fw_filter, work); rtnl_lock(); __fw_delete_filter(f); rtnl_unlock(); }

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Américo Wang37100.00%2100.00%
Total37100.00%2100.00%


static void fw_delete_filter(struct rcu_head *head) { struct fw_filter *f = container_of(head, struct fw_filter, rcu); INIT_WORK(&f->work, fw_delete_filter_work); tcf_queue_work(&f->work); }

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PersonTokensPropCommitsCommitProp
Thomas Graf2147.73%133.33%
John Fastabend1534.09%133.33%
Américo Wang818.18%133.33%
Total44100.00%3100.00%


static void fw_destroy(struct tcf_proto *tp) { struct fw_head *head = rtnl_dereference(tp->root); struct fw_filter *f; int h; if (head == NULL) return; for (h = 0; h < HTSIZE; h++) { while ((f = rtnl_dereference(head->ht[h])) != NULL) { RCU_INIT_POINTER(head->ht[h], rtnl_dereference(f->next)); tcf_unbind_filter(tp, &f->res); if (tcf_exts_get_net(&f->exts)) call_rcu(&f->rcu, fw_delete_filter); else __fw_delete_filter(f); } } kfree_rcu(head, rcu); }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)8261.65%228.57%
John Fastabend3224.06%228.57%
Américo Wang1813.53%228.57%
Thomas Graf10.75%114.29%
Total133100.00%7100.00%


static int fw_delete(struct tcf_proto *tp, void *arg, bool *last) { struct fw_head *head = rtnl_dereference(tp->root); struct fw_filter *f = arg; struct fw_filter __rcu **fp; struct fw_filter *pfp; int ret = -EINVAL; int h; if (head == NULL || f == NULL) goto out; fp = &head->ht[fw_hash(f->id)]; for (pfp = rtnl_dereference(*fp); pfp; fp = &pfp->next, pfp = rtnl_dereference(*fp)) { if (pfp == f) { RCU_INIT_POINTER(*fp, rtnl_dereference(f->next)); tcf_unbind_filter(tp, &f->res); tcf_exts_get_net(&f->exts); call_rcu(&f->rcu, fw_delete_filter); ret = 0; break; } } *last = true; for (h = 0; h < HTSIZE; h++) { if (rcu_access_pointer(head->ht[h])) { *last = false; break; } } out: return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)9242.79%333.33%
Américo Wang6831.63%333.33%
John Fastabend5023.26%222.22%
Arnaldo Carvalho de Melo52.33%111.11%
Total215100.00%9100.00%

static const struct nla_policy fw_policy[TCA_FW_MAX + 1] = { [TCA_FW_CLASSID] = { .type = NLA_U32 }, [TCA_FW_INDEV] = { .type = NLA_STRING, .len = IFNAMSIZ }, [TCA_FW_MASK] = { .type = NLA_U32 }, };
static int fw_set_parms(struct net *net, struct tcf_proto *tp, struct fw_filter *f, struct nlattr **tb, struct nlattr **tca, unsigned long base, bool ovr) { struct fw_head *head = rtnl_dereference(tp->root); u32 mask; int err; err = tcf_exts_validate(net, tp, tb, tca[TCA_RATE], &f->exts, ovr); if (err < 0) return err; if (tb[TCA_FW_CLASSID]) { f->res.classid = nla_get_u32(tb[TCA_FW_CLASSID]); tcf_bind_filter(tp, &f->res, base); } #ifdef CONFIG_NET_CLS_IND if (tb[TCA_FW_INDEV]) { int ret; ret = tcf_change_indev(net, tb[TCA_FW_INDEV]); if (ret < 0) return ret; f->ifindex = ret; } #endif /* CONFIG_NET_CLS_IND */ err = -EINVAL; if (tb[TCA_FW_MASK]) { mask = nla_get_u32(tb[TCA_FW_MASK]); if (mask != head->mask) return err; } else if (head->mask != 0xFFFFFFFF) return err; return 0; }

Contributors

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Linus Torvalds (pre-git)6429.09%211.11%
Patrick McHardy5022.73%316.67%
Thomas Graf4922.27%316.67%
Américo Wang146.36%211.11%
Jiri Pirko146.36%211.11%
Jamal Hadi Salim83.64%15.56%
Benjamin LaHaise73.18%15.56%
Wei Yongjun62.73%211.11%
Cong Wang52.27%15.56%
John Fastabend31.36%15.56%
Total220100.00%18100.00%


static int fw_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) { struct fw_head *head = rtnl_dereference(tp->root); struct fw_filter *f = *arg; struct nlattr *opt = tca[TCA_OPTIONS]; struct nlattr *tb[TCA_FW_MAX + 1]; int err; if (!opt) return handle ? -EINVAL : 0; /* Succeed if it is old method. */ err = nla_parse_nested(tb, TCA_FW_MAX, opt, fw_policy, NULL); if (err < 0) return err; if (f) { struct fw_filter *pfp, *fnew; struct fw_filter __rcu **fp; if (f->id != handle && handle) return -EINVAL; fnew = kzalloc(sizeof(struct fw_filter), GFP_KERNEL); if (!fnew) return -ENOBUFS; fnew->id = f->id; fnew->res = f->res; #ifdef CONFIG_NET_CLS_IND fnew->ifindex = f->ifindex; #endif /* CONFIG_NET_CLS_IND */ fnew->tp = f->tp; err = tcf_exts_init(&fnew->exts, TCA_FW_ACT, TCA_FW_POLICE); if (err < 0) { kfree(fnew); return err; } err = fw_set_parms(net, tp, fnew, tb, tca, base, ovr); if (err < 0) { tcf_exts_destroy(&fnew->exts); kfree(fnew); return err; } fp = &head->ht[fw_hash(fnew->id)]; for (pfp = rtnl_dereference(*fp); pfp; fp = &pfp->next, pfp = rtnl_dereference(*fp)) if (pfp == f) break; RCU_INIT_POINTER(fnew->next, rtnl_dereference(pfp->next)); rcu_assign_pointer(*fp, fnew); tcf_unbind_filter(tp, &f->res); tcf_exts_get_net(&f->exts); call_rcu(&f->rcu, fw_delete_filter); *arg = fnew; return err; } if (!handle) return -EINVAL; if (!head) { u32 mask = 0xFFFFFFFF; if (tb[TCA_FW_MASK]) mask = nla_get_u32(tb[TCA_FW_MASK]); head = kzalloc(sizeof(*head), GFP_KERNEL); if (!head) return -ENOBUFS; head->mask = mask; rcu_assign_pointer(tp->root, head); } f = kzalloc(sizeof(struct fw_filter), GFP_KERNEL); if (f == NULL) return -ENOBUFS; err = tcf_exts_init(&f->exts, TCA_FW_ACT, TCA_FW_POLICE); if (err < 0) goto errout; f->id = handle; f->tp = tp; err = fw_set_parms(net, tp, f, tb, tca, base, ovr); if (err < 0) goto errout; RCU_INIT_POINTER(f->next, head->ht[fw_hash(handle)]); rcu_assign_pointer(head->ht[fw_hash(handle)], f); *arg = f; return 0; errout: tcf_exts_destroy(&f->exts); kfree(f); return err; }

Contributors

PersonTokensPropCommitsCommitProp
John Fastabend21935.49%312.00%
Thomas Graf11718.96%14.00%
Américo Wang10517.02%728.00%
Linus Torvalds (pre-git)7612.32%28.00%
Jamal Hadi Salim386.16%14.00%
Patrick McHardy365.83%520.00%
Benjamin LaHaise91.46%14.00%
Cong Wang71.13%14.00%
Eric W. Biedermann50.81%14.00%
Johannes Berg20.32%14.00%
Jiri Pirko20.32%14.00%
Panagiotis Issaris10.16%14.00%
Total617100.00%25100.00%


static void fw_walk(struct tcf_proto *tp, struct tcf_walker *arg) { struct fw_head *head = rtnl_dereference(tp->root); int h; if (head == NULL) arg->stop = 1; if (arg->stop) return; for (h = 0; h < HTSIZE; h++) { struct fw_filter *f; for (f = rtnl_dereference(head->ht[h]); f; f = rtnl_dereference(f->next)) { if (arg->count < arg->skip) { arg->count++; continue; } if (arg->fn(tp, f, arg) < 0) { arg->stop = 1; return; } arg->count++; } } }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)13392.36%240.00%
John Fastabend96.25%120.00%
Thomas Graf21.39%240.00%
Total144100.00%5100.00%


static int fw_dump(struct net *net, struct tcf_proto *tp, void *fh, struct sk_buff *skb, struct tcmsg *t) { struct fw_head *head = rtnl_dereference(tp->root); struct fw_filter *f = fh; struct nlattr *nest; if (f == NULL) return skb->len; t->tcm_handle = f->id; if (!f->res.classid && !tcf_exts_has_actions(&f->exts)) return skb->len; nest = nla_nest_start(skb, TCA_OPTIONS); if (nest == NULL) goto nla_put_failure; if (f->res.classid && nla_put_u32(skb, TCA_FW_CLASSID, f->res.classid)) goto nla_put_failure; #ifdef CONFIG_NET_CLS_IND if (f->ifindex) { struct net_device *dev; dev = __dev_get_by_index(net, f->ifindex); if (dev && nla_put_string(skb, TCA_FW_INDEV, dev->name)) goto nla_put_failure; } #endif /* CONFIG_NET_CLS_IND */ if (head->mask != 0xFFFFFFFF && nla_put_u32(skb, TCA_FW_MASK, head->mask)) goto nla_put_failure; if (tcf_exts_dump(skb, &f->exts) < 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

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Linus Torvalds (pre-git)13149.06%316.67%
Patrick McHardy4416.48%316.67%
Américo Wang3011.24%316.67%
Jamal Hadi Salim238.61%15.56%
David S. Miller186.74%15.56%
Thomas Graf134.87%316.67%
John Fastabend31.12%15.56%
Jiri Pirko31.12%211.11%
Arnaldo Carvalho de Melo20.75%15.56%
Total267100.00%18100.00%


static void fw_bind_class(void *fh, u32 classid, unsigned long cl) { struct fw_filter *f = fh; if (f && f->res.classid == classid) f->res.class = cl; }

Contributors

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Américo Wang44100.00%1100.00%
Total44100.00%1100.00%

static struct tcf_proto_ops cls_fw_ops __read_mostly = { .kind = "fw", .classify = fw_classify, .init = fw_init, .destroy = fw_destroy, .get = fw_get, .change = fw_change, .delete = fw_delete, .walk = fw_walk, .dump = fw_dump, .bind_class = fw_bind_class, .owner = THIS_MODULE, };
static int __init init_fw(void) { return register_tcf_proto_ops(&cls_fw_ops); }

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Linus Torvalds (pre-git)1381.25%150.00%
Al Viro318.75%150.00%
Total16100.00%2100.00%


static void __exit exit_fw(void) { unregister_tcf_proto_ops(&cls_fw_ops); }

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Linus Torvalds (pre-git)1280.00%150.00%
Al Viro320.00%150.00%
Total15100.00%2100.00%

module_init(init_fw) module_exit(exit_fw) MODULE_LICENSE("GPL");

Overall Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)91438.88%69.52%
Américo Wang37816.08%1219.05%
John Fastabend36715.61%34.76%
Thomas Graf25110.68%1117.46%
Patrick McHardy1898.04%914.29%
Jamal Hadi Salim954.04%11.59%
David S. Miller532.25%34.76%
Jiri Pirko190.81%46.35%
Benjamin LaHaise160.68%11.59%
Al Viro150.64%11.59%
Eric Dumazet130.55%23.17%
Cong Wang120.51%11.59%
Arnaldo Carvalho de Melo70.30%23.17%
Wei Yongjun60.26%23.17%
Eric W. Biedermann50.21%11.59%
Linus Torvalds50.21%11.59%
Tejun Heo30.13%11.59%
Johannes Berg20.09%11.59%
Panagiotis Issaris10.04%11.59%
Total2351100.00%63100.00%
Directory: net/sched
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