| /* |
| * net/sched/act_simple.c Simple example of an action |
| * |
| * 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 (2005-8) |
| * |
| */ |
| |
| #include <linux/module.h> |
| #include <linux/slab.h> |
| #include <linux/init.h> |
| #include <linux/kernel.h> |
| #include <linux/skbuff.h> |
| #include <linux/rtnetlink.h> |
| #include <net/netlink.h> |
| #include <net/pkt_sched.h> |
| |
| #define TCA_ACT_SIMP 22 |
| |
| #include <linux/tc_act/tc_defact.h> |
| #include <net/tc_act/tc_defact.h> |
| |
| static unsigned int simp_net_id; |
| static struct tc_action_ops act_simp_ops; |
| |
| #define SIMP_MAX_DATA 32 |
| static int tcf_simp(struct sk_buff *skb, const struct tc_action *a, |
| struct tcf_result *res) |
| { |
| struct tcf_defact *d = to_defact(a); |
| |
| spin_lock(&d->tcf_lock); |
| tcf_lastuse_update(&d->tcf_tm); |
| bstats_update(&d->tcf_bstats, skb); |
| |
| /* print policy string followed by _ then packet count |
| * Example if this was the 3rd packet and the string was "hello" |
| * then it would look like "hello_3" (without quotes) |
| */ |
| pr_info("simple: %s_%d\n", |
| (char *)d->tcfd_defdata, d->tcf_bstats.packets); |
| spin_unlock(&d->tcf_lock); |
| return d->tcf_action; |
| } |
| |
| static void tcf_simp_release(struct tc_action *a) |
| { |
| struct tcf_defact *d = to_defact(a); |
| kfree(d->tcfd_defdata); |
| } |
| |
| static int alloc_defdata(struct tcf_defact *d, const struct nlattr *defdata) |
| { |
| d->tcfd_defdata = kzalloc(SIMP_MAX_DATA, GFP_KERNEL); |
| if (unlikely(!d->tcfd_defdata)) |
| return -ENOMEM; |
| nla_strlcpy(d->tcfd_defdata, defdata, SIMP_MAX_DATA); |
| return 0; |
| } |
| |
| static void reset_policy(struct tcf_defact *d, const struct nlattr *defdata, |
| struct tc_defact *p) |
| { |
| spin_lock_bh(&d->tcf_lock); |
| d->tcf_action = p->action; |
| memset(d->tcfd_defdata, 0, SIMP_MAX_DATA); |
| nla_strlcpy(d->tcfd_defdata, defdata, SIMP_MAX_DATA); |
| spin_unlock_bh(&d->tcf_lock); |
| } |
| |
| static const struct nla_policy simple_policy[TCA_DEF_MAX + 1] = { |
| [TCA_DEF_PARMS] = { .len = sizeof(struct tc_defact) }, |
| [TCA_DEF_DATA] = { .type = NLA_STRING, .len = SIMP_MAX_DATA }, |
| }; |
| |
| static int tcf_simp_init(struct net *net, struct nlattr *nla, |
| struct nlattr *est, struct tc_action **a, |
| int ovr, int bind, struct netlink_ext_ack *extack) |
| { |
| struct tc_action_net *tn = net_generic(net, simp_net_id); |
| struct nlattr *tb[TCA_DEF_MAX + 1]; |
| struct tc_defact *parm; |
| struct tcf_defact *d; |
| bool exists = false; |
| int ret = 0, err; |
| |
| if (nla == NULL) |
| return -EINVAL; |
| |
| err = nla_parse_nested(tb, TCA_DEF_MAX, nla, simple_policy, NULL); |
| if (err < 0) |
| return err; |
| |
| if (tb[TCA_DEF_PARMS] == NULL) |
| return -EINVAL; |
| |
| parm = nla_data(tb[TCA_DEF_PARMS]); |
| exists = tcf_idr_check(tn, parm->index, a, bind); |
| if (exists && bind) |
| return 0; |
| |
| if (tb[TCA_DEF_DATA] == NULL) { |
| if (exists) |
| tcf_idr_release(*a, bind); |
| return -EINVAL; |
| } |
| |
| if (!exists) { |
| ret = tcf_idr_create(tn, parm->index, est, a, |
| &act_simp_ops, bind, false); |
| if (ret) |
| return ret; |
| |
| d = to_defact(*a); |
| ret = alloc_defdata(d, tb[TCA_DEF_DATA]); |
| if (ret < 0) { |
| tcf_idr_release(*a, bind); |
| return ret; |
| } |
| d->tcf_action = parm->action; |
| ret = ACT_P_CREATED; |
| } else { |
| d = to_defact(*a); |
| |
| tcf_idr_release(*a, bind); |
| if (!ovr) |
| return -EEXIST; |
| |
| reset_policy(d, tb[TCA_DEF_DATA], parm); |
| } |
| |
| if (ret == ACT_P_CREATED) |
| tcf_idr_insert(tn, *a); |
| return ret; |
| } |
| |
| static int tcf_simp_dump(struct sk_buff *skb, struct tc_action *a, |
| int bind, int ref) |
| { |
| unsigned char *b = skb_tail_pointer(skb); |
| struct tcf_defact *d = to_defact(a); |
| struct tc_defact opt = { |
| .index = d->tcf_index, |
| .refcnt = d->tcf_refcnt - ref, |
| .bindcnt = d->tcf_bindcnt - bind, |
| .action = d->tcf_action, |
| }; |
| struct tcf_t t; |
| |
| if (nla_put(skb, TCA_DEF_PARMS, sizeof(opt), &opt) || |
| nla_put_string(skb, TCA_DEF_DATA, d->tcfd_defdata)) |
| goto nla_put_failure; |
| |
| tcf_tm_dump(&t, &d->tcf_tm); |
| if (nla_put_64bit(skb, TCA_DEF_TM, sizeof(t), &t, TCA_DEF_PAD)) |
| goto nla_put_failure; |
| return skb->len; |
| |
| nla_put_failure: |
| nlmsg_trim(skb, b); |
| return -1; |
| } |
| |
| static int tcf_simp_walker(struct net *net, struct sk_buff *skb, |
| struct netlink_callback *cb, int type, |
| const struct tc_action_ops *ops, |
| struct netlink_ext_ack *extack) |
| { |
| struct tc_action_net *tn = net_generic(net, simp_net_id); |
| |
| return tcf_generic_walker(tn, skb, cb, type, ops, extack); |
| } |
| |
| static int tcf_simp_search(struct net *net, struct tc_action **a, u32 index, |
| struct netlink_ext_ack *extack) |
| { |
| struct tc_action_net *tn = net_generic(net, simp_net_id); |
| |
| return tcf_idr_search(tn, a, index); |
| } |
| |
| static struct tc_action_ops act_simp_ops = { |
| .kind = "simple", |
| .type = TCA_ACT_SIMP, |
| .owner = THIS_MODULE, |
| .act = tcf_simp, |
| .dump = tcf_simp_dump, |
| .cleanup = tcf_simp_release, |
| .init = tcf_simp_init, |
| .walk = tcf_simp_walker, |
| .lookup = tcf_simp_search, |
| .size = sizeof(struct tcf_defact), |
| }; |
| |
| static __net_init int simp_init_net(struct net *net) |
| { |
| struct tc_action_net *tn = net_generic(net, simp_net_id); |
| |
| return tc_action_net_init(tn, &act_simp_ops); |
| } |
| |
| static void __net_exit simp_exit_net(struct list_head *net_list) |
| { |
| tc_action_net_exit(net_list, simp_net_id); |
| } |
| |
| static struct pernet_operations simp_net_ops = { |
| .init = simp_init_net, |
| .exit_batch = simp_exit_net, |
| .id = &simp_net_id, |
| .size = sizeof(struct tc_action_net), |
| }; |
| |
| MODULE_AUTHOR("Jamal Hadi Salim(2005)"); |
| MODULE_DESCRIPTION("Simple example action"); |
| MODULE_LICENSE("GPL"); |
| |
| static int __init simp_init_module(void) |
| { |
| int ret = tcf_register_action(&act_simp_ops, &simp_net_ops); |
| if (!ret) |
| pr_info("Simple TC action Loaded\n"); |
| return ret; |
| } |
| |
| static void __exit simp_cleanup_module(void) |
| { |
| tcf_unregister_action(&act_simp_ops, &simp_net_ops); |
| } |
| |
| module_init(simp_init_module); |
| module_exit(simp_cleanup_module); |