cregit-Linux how code gets into the kernel

Release 4.8 net/sched/act_pedit.c

Directory: net/sched
 * net/sched/act_pedit.c        Generic packet editor
 *              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:     Jamal Hadi Salim (2002-4)

#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/skbuff.h>
#include <linux/rtnetlink.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <net/netlink.h>
#include <net/pkt_sched.h>
#include <linux/tc_act/tc_pedit.h>
#include <net/tc_act/tc_pedit.h>

#define PEDIT_TAB_MASK	15

static int pedit_net_id;

static struct tc_action_ops act_pedit_ops;

static const struct nla_policy pedit_policy[TCA_PEDIT_MAX + 1] = {
	[TCA_PEDIT_PARMS]	= { .len = sizeof(struct tc_pedit) },

static int tcf_pedit_init(struct net *net, struct nlattr *nla, struct nlattr *est, struct tc_action **a, int ovr, int bind) { struct tc_action_net *tn = net_generic(net, pedit_net_id); struct nlattr *tb[TCA_PEDIT_MAX + 1]; struct tc_pedit *parm; int ret = 0, err; struct tcf_pedit *p; struct tc_pedit_key *keys = NULL; int ksize; if (nla == NULL) return -EINVAL; err = nla_parse_nested(tb, TCA_PEDIT_MAX, nla, pedit_policy); if (err < 0) return err; if (tb[TCA_PEDIT_PARMS] == NULL) return -EINVAL; parm = nla_data(tb[TCA_PEDIT_PARMS]); ksize = parm->nkeys * sizeof(struct tc_pedit_key); if (nla_len(tb[TCA_PEDIT_PARMS]) < sizeof(*parm) + ksize) return -EINVAL; if (!tcf_hash_check(tn, parm->index, a, bind)) { if (!parm->nkeys) return -EINVAL; ret = tcf_hash_create(tn, parm->index, est, a, &act_pedit_ops, bind, false); if (ret) return ret; p = to_pedit(*a); keys = kmalloc(ksize, GFP_KERNEL); if (keys == NULL) { tcf_hash_cleanup(*a, est); return -ENOMEM; } ret = ACT_P_CREATED; } else { if (bind) return 0; tcf_hash_release(*a, bind); if (!ovr) return -EEXIST; p = to_pedit(*a); if (p->tcfp_nkeys && p->tcfp_nkeys != parm->nkeys) { keys = kmalloc(ksize, GFP_KERNEL); if (keys == NULL) return -ENOMEM; } } spin_lock_bh(&p->tcf_lock); p->tcfp_flags = parm->flags; p->tcf_action = parm->action; if (keys) { kfree(p->tcfp_keys); p->tcfp_keys = keys; p->tcfp_nkeys = parm->nkeys; } memcpy(p->tcfp_keys, parm->keys, ksize); spin_unlock_bh(&p->tcf_lock); if (ret == ACT_P_CREATED) tcf_hash_insert(tn, *a); return ret; }


patrick mchardypatrick mchardy18944.06%635.29%
jamal hadi salimjamal hadi salim16538.46%211.76%
americo wangamerico wang5111.89%529.41%
david s. millerdavid s. miller163.73%15.88%
benjamin lahaisebenjamin lahaise51.17%15.88%
eric dumazeteric dumazet20.47%15.88%
hiroaki shimodahiroaki shimoda10.23%15.88%

static void tcf_pedit_cleanup(struct tc_action *a, int bind) { struct tcf_pedit *p = to_pedit(a); struct tc_pedit_key *keys = p->tcfp_keys; kfree(keys); }


jamal hadi salimjamal hadi salim1744.74%114.29%
patrick mchardypatrick mchardy1642.11%342.86%
americo wangamerico wang410.53%228.57%
david s. millerdavid s. miller12.63%114.29%

static int tcf_pedit(struct sk_buff *skb, const struct tc_action *a, struct tcf_result *res) { struct tcf_pedit *p = to_pedit(a); int i; unsigned int off; if (skb_unclone(skb, GFP_ATOMIC)) return p->tcf_action; off = skb_network_offset(skb); spin_lock(&p->tcf_lock); tcf_lastuse_update(&p->tcf_tm); if (p->tcfp_nkeys > 0) { struct tc_pedit_key *tkey = p->tcfp_keys; for (i = p->tcfp_nkeys; i > 0; i--, tkey++) { u32 *ptr, _data; int offset = tkey->off; if (tkey->offmask) { char *d, _d; d = skb_header_pointer(skb, off + tkey->at, 1, &_d); if (!d) goto bad; offset += (*d & tkey->offmask) >> tkey->shift; } if (offset % 4) { pr_info("tc filter pedit" " offset must be on 32 bit boundaries\n"); goto bad; } if (offset > 0 && offset > skb->len) { pr_info("tc filter pedit" " offset %d can't exceed pkt length %d\n", offset, skb->len); goto bad; } ptr = skb_header_pointer(skb, off + offset, 4, &_data); if (!ptr) goto bad; /* just do it, baby */ *ptr = ((*ptr & tkey->mask) ^ tkey->val); if (ptr == &_data) skb_store_bits(skb, off + offset, ptr, 4); } goto done; } else WARN(1, "pedit BUG: index %d\n", p->tcf_index); bad: p->tcf_qstats.overlimits++; done: bstats_update(&p->tcf_bstats, skb); spin_unlock(&p->tcf_lock); return p->tcf_action; }


jamal hadi salimjamal hadi salim22565.98%317.65%
changli gaochangli gao7321.41%15.88%
patrick mchardypatrick mchardy113.23%423.53%
david s. millerdavid s. miller113.23%15.88%
stephen hemmingerstephen hemminger82.35%15.88%
eric dumazeteric dumazet51.47%211.76%
americo wangamerico wang30.88%15.88%
arnaldo carvalho de meloarnaldo carvalho de melo20.59%15.88%
lucas de marchilucas de marchi10.29%15.88%
pravin b shelarpravin b shelar10.29%15.88%
jussi kivilinnajussi kivilinna10.29%15.88%

static int tcf_pedit_dump(struct sk_buff *skb, struct tc_action *a, int bind, int ref) { unsigned char *b = skb_tail_pointer(skb); struct tcf_pedit *p = to_pedit(a); struct tc_pedit *opt; struct tcf_t t; int s; s = sizeof(*opt) + p->tcfp_nkeys * sizeof(struct tc_pedit_key); /* netlink spinlocks held above us - must use ATOMIC */ opt = kzalloc(s, GFP_ATOMIC); if (unlikely(!opt)) return -ENOBUFS; memcpy(opt->keys, p->tcfp_keys, p->tcfp_nkeys * sizeof(struct tc_pedit_key)); opt->index = p->tcf_index; opt->nkeys = p->tcfp_nkeys; opt->flags = p->tcfp_flags; opt->action = p->tcf_action; opt->refcnt = p->tcf_refcnt - ref; opt->bindcnt = p->tcf_bindcnt - bind; if (nla_put(skb, TCA_PEDIT_PARMS, s, opt)) goto nla_put_failure; tcf_tm_dump(&t, &p->tcf_tm); if (nla_put_64bit(skb, TCA_PEDIT_TM, sizeof(t), &t, TCA_PEDIT_PAD)) goto nla_put_failure; kfree(opt); return skb->len; nla_put_failure: nlmsg_trim(skb, b); kfree(opt); return -1; }


jamal hadi salimjamal hadi salim18475.41%320.00%
david s. millerdavid s. miller3213.11%213.33%
patrick mchardypatrick mchardy176.97%533.33%
arnaldo carvalho de meloarnaldo carvalho de melo41.64%213.33%
nicolas dichtelnicolas dichtel31.23%16.67%
americo wangamerico wang31.23%16.67%
panagiotis issaris*panagiotis issaris*10.41%16.67%

static int tcf_pedit_walker(struct net *net, struct sk_buff *skb, struct netlink_callback *cb, int type, const struct tc_action_ops *ops) { struct tc_action_net *tn = net_generic(net, pedit_net_id); return tcf_generic_walker(tn, skb, cb, type, ops); }


americo wangamerico wang56100.00%2100.00%

static int tcf_pedit_search(struct net *net, struct tc_action **a, u32 index) { struct tc_action_net *tn = net_generic(net, pedit_net_id); return tcf_hash_search(tn, a, index); }


americo wangamerico wang42100.00%2100.00%

static struct tc_action_ops act_pedit_ops = { .kind = "pedit", .type = TCA_ACT_PEDIT, .owner = THIS_MODULE, .act = tcf_pedit, .dump = tcf_pedit_dump, .cleanup = tcf_pedit_cleanup, .init = tcf_pedit_init, .walk = tcf_pedit_walker, .lookup = tcf_pedit_search, .size = sizeof(struct tcf_pedit), };
static __net_init int pedit_init_net(struct net *net) { struct tc_action_net *tn = net_generic(net, pedit_net_id); return tc_action_net_init(tn, &act_pedit_ops, PEDIT_TAB_MASK); }


americo wangamerico wang35100.00%1100.00%

static void __net_exit pedit_exit_net(struct net *net) { struct tc_action_net *tn = net_generic(net, pedit_net_id); tc_action_net_exit(tn); }


americo wangamerico wang29100.00%1100.00%

static struct pernet_operations pedit_net_ops = { .init = pedit_init_net, .exit = pedit_exit_net, .id = &pedit_net_id, .size = sizeof(struct tc_action_net), }; MODULE_AUTHOR("Jamal Hadi Salim(2002-4)"); MODULE_DESCRIPTION("Generic Packet Editor actions"); MODULE_LICENSE("GPL");
static int __init pedit_init_module(void) { return tcf_register_action(&act_pedit_ops, &pedit_net_ops); }


jamal hadi salimjamal hadi salim1684.21%133.33%
americo wangamerico wang315.79%266.67%

static void __exit pedit_cleanup_module(void) { tcf_unregister_action(&act_pedit_ops, &pedit_net_ops); }


jamal hadi salimjamal hadi salim1583.33%150.00%
americo wangamerico wang316.67%150.00%

module_init(pedit_init_module); module_exit(pedit_cleanup_module);

Overall Contributors

jamal hadi salimjamal hadi salim72550.00%818.18%
americo wangamerico wang28919.93%715.91%
patrick mchardypatrick mchardy26017.93%1022.73%
changli gaochangli gao735.03%12.27%
david s. millerdavid s. miller624.28%24.55%
arnaldo carvalho de meloarnaldo carvalho de melo90.62%36.82%
stephen hemmingerstephen hemminger80.55%12.27%
eric dumazeteric dumazet70.48%36.82%
benjamin lahaisebenjamin lahaise50.34%12.27%
tejun heotejun heo30.21%12.27%
nicolas dichtelnicolas dichtel30.21%12.27%
panagiotis issaris*panagiotis issaris*10.07%12.27%
jiri pirkojiri pirko10.07%12.27%
lucas de marchilucas de marchi10.07%12.27%
pravin b shelarpravin b shelar10.07%12.27%
jussi kivilinnajussi kivilinna10.07%12.27%
hiroaki shimodahiroaki shimoda10.07%12.27%
Directory: net/sched
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