1 /* 2 * Copyright (c) 2008, Intel Corporation. 3 * 4 * This program is free software; you can redistribute it and/or modify it 5 * under the terms and conditions of the GNU General Public License, 6 * version 2, as published by the Free Software Foundation. 7 * 8 * This program is distributed in the hope it will be useful, but WITHOUT 9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 11 * more details. 12 * 13 * You should have received a copy of the GNU General Public License along with 14 * this program; if not, see <http://www.gnu.org/licenses/>. 15 * 16 * Author: Alexander Duyck <alexander.h.duyck@intel.com> 17 */ 18 19 #include <linux/module.h> 20 #include <linux/init.h> 21 #include <linux/kernel.h> 22 #include <linux/skbuff.h> 23 #include <linux/rtnetlink.h> 24 #include <net/netlink.h> 25 #include <net/pkt_sched.h> 26 27 #include <linux/tc_act/tc_skbedit.h> 28 #include <net/tc_act/tc_skbedit.h> 29 30 #define SKBEDIT_TAB_MASK 15 31 32 static int skbedit_net_id; 33 static struct tc_action_ops act_skbedit_ops; 34 35 static int tcf_skbedit(struct sk_buff *skb, const struct tc_action *a, 36 struct tcf_result *res) 37 { 38 struct tcf_skbedit *d = to_skbedit(a); 39 40 spin_lock(&d->tcf_lock); 41 tcf_lastuse_update(&d->tcf_tm); 42 bstats_update(&d->tcf_bstats, skb); 43 44 if (d->flags & SKBEDIT_F_PRIORITY) 45 skb->priority = d->priority; 46 if (d->flags & SKBEDIT_F_QUEUE_MAPPING && 47 skb->dev->real_num_tx_queues > d->queue_mapping) 48 skb_set_queue_mapping(skb, d->queue_mapping); 49 if (d->flags & SKBEDIT_F_MARK) 50 skb->mark = d->mark; 51 if (d->flags & SKBEDIT_F_PTYPE) 52 skb->pkt_type = d->ptype; 53 54 spin_unlock(&d->tcf_lock); 55 return d->tcf_action; 56 } 57 58 static const struct nla_policy skbedit_policy[TCA_SKBEDIT_MAX + 1] = { 59 [TCA_SKBEDIT_PARMS] = { .len = sizeof(struct tc_skbedit) }, 60 [TCA_SKBEDIT_PRIORITY] = { .len = sizeof(u32) }, 61 [TCA_SKBEDIT_QUEUE_MAPPING] = { .len = sizeof(u16) }, 62 [TCA_SKBEDIT_MARK] = { .len = sizeof(u32) }, 63 [TCA_SKBEDIT_PTYPE] = { .len = sizeof(u16) }, 64 }; 65 66 static int tcf_skbedit_init(struct net *net, struct nlattr *nla, 67 struct nlattr *est, struct tc_action **a, 68 int ovr, int bind) 69 { 70 struct tc_action_net *tn = net_generic(net, skbedit_net_id); 71 struct nlattr *tb[TCA_SKBEDIT_MAX + 1]; 72 struct tc_skbedit *parm; 73 struct tcf_skbedit *d; 74 u32 flags = 0, *priority = NULL, *mark = NULL; 75 u16 *queue_mapping = NULL, *ptype = NULL; 76 bool exists = false; 77 int ret = 0, err; 78 79 if (nla == NULL) 80 return -EINVAL; 81 82 err = nla_parse_nested(tb, TCA_SKBEDIT_MAX, nla, skbedit_policy); 83 if (err < 0) 84 return err; 85 86 if (tb[TCA_SKBEDIT_PARMS] == NULL) 87 return -EINVAL; 88 89 if (tb[TCA_SKBEDIT_PRIORITY] != NULL) { 90 flags |= SKBEDIT_F_PRIORITY; 91 priority = nla_data(tb[TCA_SKBEDIT_PRIORITY]); 92 } 93 94 if (tb[TCA_SKBEDIT_QUEUE_MAPPING] != NULL) { 95 flags |= SKBEDIT_F_QUEUE_MAPPING; 96 queue_mapping = nla_data(tb[TCA_SKBEDIT_QUEUE_MAPPING]); 97 } 98 99 if (tb[TCA_SKBEDIT_PTYPE] != NULL) { 100 ptype = nla_data(tb[TCA_SKBEDIT_PTYPE]); 101 if (!skb_pkt_type_ok(*ptype)) 102 return -EINVAL; 103 flags |= SKBEDIT_F_PTYPE; 104 } 105 106 if (tb[TCA_SKBEDIT_MARK] != NULL) { 107 flags |= SKBEDIT_F_MARK; 108 mark = nla_data(tb[TCA_SKBEDIT_MARK]); 109 } 110 111 parm = nla_data(tb[TCA_SKBEDIT_PARMS]); 112 113 exists = tcf_hash_check(tn, parm->index, a, bind); 114 if (exists && bind) 115 return 0; 116 117 if (!flags) { 118 tcf_hash_release(*a, bind); 119 return -EINVAL; 120 } 121 122 if (!exists) { 123 ret = tcf_hash_create(tn, parm->index, est, a, 124 &act_skbedit_ops, bind, false); 125 if (ret) 126 return ret; 127 128 d = to_skbedit(*a); 129 ret = ACT_P_CREATED; 130 } else { 131 d = to_skbedit(*a); 132 tcf_hash_release(*a, bind); 133 if (!ovr) 134 return -EEXIST; 135 } 136 137 spin_lock_bh(&d->tcf_lock); 138 139 d->flags = flags; 140 if (flags & SKBEDIT_F_PRIORITY) 141 d->priority = *priority; 142 if (flags & SKBEDIT_F_QUEUE_MAPPING) 143 d->queue_mapping = *queue_mapping; 144 if (flags & SKBEDIT_F_MARK) 145 d->mark = *mark; 146 if (flags & SKBEDIT_F_PTYPE) 147 d->ptype = *ptype; 148 149 d->tcf_action = parm->action; 150 151 spin_unlock_bh(&d->tcf_lock); 152 153 if (ret == ACT_P_CREATED) 154 tcf_hash_insert(tn, *a); 155 return ret; 156 } 157 158 static int tcf_skbedit_dump(struct sk_buff *skb, struct tc_action *a, 159 int bind, int ref) 160 { 161 unsigned char *b = skb_tail_pointer(skb); 162 struct tcf_skbedit *d = to_skbedit(a); 163 struct tc_skbedit opt = { 164 .index = d->tcf_index, 165 .refcnt = d->tcf_refcnt - ref, 166 .bindcnt = d->tcf_bindcnt - bind, 167 .action = d->tcf_action, 168 }; 169 struct tcf_t t; 170 171 if (nla_put(skb, TCA_SKBEDIT_PARMS, sizeof(opt), &opt)) 172 goto nla_put_failure; 173 if ((d->flags & SKBEDIT_F_PRIORITY) && 174 nla_put_u32(skb, TCA_SKBEDIT_PRIORITY, d->priority)) 175 goto nla_put_failure; 176 if ((d->flags & SKBEDIT_F_QUEUE_MAPPING) && 177 nla_put_u16(skb, TCA_SKBEDIT_QUEUE_MAPPING, d->queue_mapping)) 178 goto nla_put_failure; 179 if ((d->flags & SKBEDIT_F_MARK) && 180 nla_put_u32(skb, TCA_SKBEDIT_MARK, d->mark)) 181 goto nla_put_failure; 182 if ((d->flags & SKBEDIT_F_PTYPE) && 183 nla_put_u16(skb, TCA_SKBEDIT_PTYPE, d->ptype)) 184 goto nla_put_failure; 185 186 tcf_tm_dump(&t, &d->tcf_tm); 187 if (nla_put_64bit(skb, TCA_SKBEDIT_TM, sizeof(t), &t, TCA_SKBEDIT_PAD)) 188 goto nla_put_failure; 189 return skb->len; 190 191 nla_put_failure: 192 nlmsg_trim(skb, b); 193 return -1; 194 } 195 196 static int tcf_skbedit_walker(struct net *net, struct sk_buff *skb, 197 struct netlink_callback *cb, int type, 198 const struct tc_action_ops *ops) 199 { 200 struct tc_action_net *tn = net_generic(net, skbedit_net_id); 201 202 return tcf_generic_walker(tn, skb, cb, type, ops); 203 } 204 205 static int tcf_skbedit_search(struct net *net, struct tc_action **a, u32 index) 206 { 207 struct tc_action_net *tn = net_generic(net, skbedit_net_id); 208 209 return tcf_hash_search(tn, a, index); 210 } 211 212 static struct tc_action_ops act_skbedit_ops = { 213 .kind = "skbedit", 214 .type = TCA_ACT_SKBEDIT, 215 .owner = THIS_MODULE, 216 .act = tcf_skbedit, 217 .dump = tcf_skbedit_dump, 218 .init = tcf_skbedit_init, 219 .walk = tcf_skbedit_walker, 220 .lookup = tcf_skbedit_search, 221 .size = sizeof(struct tcf_skbedit), 222 }; 223 224 static __net_init int skbedit_init_net(struct net *net) 225 { 226 struct tc_action_net *tn = net_generic(net, skbedit_net_id); 227 228 return tc_action_net_init(tn, &act_skbedit_ops, SKBEDIT_TAB_MASK); 229 } 230 231 static void __net_exit skbedit_exit_net(struct net *net) 232 { 233 struct tc_action_net *tn = net_generic(net, skbedit_net_id); 234 235 tc_action_net_exit(tn); 236 } 237 238 static struct pernet_operations skbedit_net_ops = { 239 .init = skbedit_init_net, 240 .exit = skbedit_exit_net, 241 .id = &skbedit_net_id, 242 .size = sizeof(struct tc_action_net), 243 }; 244 245 MODULE_AUTHOR("Alexander Duyck, <alexander.h.duyck@intel.com>"); 246 MODULE_DESCRIPTION("SKB Editing"); 247 MODULE_LICENSE("GPL"); 248 249 static int __init skbedit_init_module(void) 250 { 251 return tcf_register_action(&act_skbedit_ops, &skbedit_net_ops); 252 } 253 254 static void __exit skbedit_cleanup_module(void) 255 { 256 tcf_unregister_action(&act_skbedit_ops, &skbedit_net_ops); 257 } 258 259 module_init(skbedit_init_module); 260 module_exit(skbedit_cleanup_module); 261