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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 | /* * net/sched/simp.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> #define SIMP_TAB_MASK 7 #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 = a->priv; spin_lock(&d->tcf_lock); d->tcf_tm.lastuse = jiffies; 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, int bind) { struct tcf_defact *d = to_defact(a); kfree(d->tcfd_defdata); } static int alloc_defdata(struct tcf_defact *d, char *defdata) { d->tcfd_defdata = kzalloc(SIMP_MAX_DATA, GFP_KERNEL); if (unlikely(!d->tcfd_defdata)) return -ENOMEM; strlcpy(d->tcfd_defdata, defdata, SIMP_MAX_DATA); return 0; } static void reset_policy(struct tcf_defact *d, char *defdata, struct tc_defact *p) { spin_lock_bh(&d->tcf_lock); d->tcf_action = p->action; memset(d->tcfd_defdata, 0, SIMP_MAX_DATA); 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 nlattr *tb[TCA_DEF_MAX + 1]; struct tc_defact *parm; struct tcf_defact *d; char *defdata; int ret = 0, err; if (nla == NULL) return -EINVAL; err = nla_parse_nested(tb, TCA_DEF_MAX, nla, simple_policy); if (err < 0) return err; if (tb[TCA_DEF_PARMS] == NULL) return -EINVAL; if (tb[TCA_DEF_DATA] == NULL) return -EINVAL; parm = nla_data(tb[TCA_DEF_PARMS]); defdata = nla_data(tb[TCA_DEF_DATA]); if (!tcf_hash_check(parm->index, a, bind)) { ret = tcf_hash_create(parm->index, est, a, sizeof(*d), bind); if (ret) return ret; d = to_defact(a); ret = alloc_defdata(d, defdata); if (ret < 0) { tcf_hash_cleanup(a, est); return ret; } d->tcf_action = parm->action; ret = ACT_P_CREATED; } else { d = to_defact(a); if (bind) return 0; tcf_hash_release(a, bind); if (!ovr) return -EEXIST; reset_policy(d, defdata, parm); } if (ret == ACT_P_CREATED) tcf_hash_insert(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 = a->priv; 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; t.install = jiffies_to_clock_t(jiffies - d->tcf_tm.install); t.lastuse = jiffies_to_clock_t(jiffies - d->tcf_tm.lastuse); t.expires = jiffies_to_clock_t(d->tcf_tm.expires); if (nla_put(skb, TCA_DEF_TM, sizeof(t), &t)) goto nla_put_failure; return skb->len; nla_put_failure: nlmsg_trim(skb, b); return -1; } 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, }; MODULE_AUTHOR("Jamal Hadi Salim(2005)"); MODULE_DESCRIPTION("Simple example action"); MODULE_LICENSE("GPL"); static int __init simp_init_module(void) { int ret; ret = tcf_register_action(&act_simp_ops, SIMP_TAB_MASK); if (!ret) pr_info("Simple TC action Loaded\n"); return ret; } static void __exit simp_cleanup_module(void) { tcf_unregister_action(&act_simp_ops); } module_init(simp_init_module); module_exit(simp_cleanup_module); |