| // SPDX-License-Identifier: GPL-2.0-only |
| /* |
| * Copyright (c) 2008, Intel Corporation. |
| * |
| * Author: Alexander Duyck <alexander.h.duyck@intel.com> |
| */ |
| |
| #include <linux/module.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> |
| #include <net/ip.h> |
| #include <net/ipv6.h> |
| #include <net/dsfield.h> |
| #include <net/pkt_cls.h> |
| |
| #include <linux/tc_act/tc_skbedit.h> |
| #include <net/tc_act/tc_skbedit.h> |
| |
| static unsigned int skbedit_net_id; |
| static struct tc_action_ops act_skbedit_ops; |
| |
| static int tcf_skbedit_act(struct sk_buff *skb, const struct tc_action *a, |
| struct tcf_result *res) |
| { |
| struct tcf_skbedit *d = to_skbedit(a); |
| struct tcf_skbedit_params *params; |
| int action; |
| |
| tcf_lastuse_update(&d->tcf_tm); |
| bstats_cpu_update(this_cpu_ptr(d->common.cpu_bstats), skb); |
| |
| params = rcu_dereference_bh(d->params); |
| action = READ_ONCE(d->tcf_action); |
| |
| if (params->flags & SKBEDIT_F_PRIORITY) |
| skb->priority = params->priority; |
| if (params->flags & SKBEDIT_F_INHERITDSFIELD) { |
| int wlen = skb_network_offset(skb); |
| |
| switch (tc_skb_protocol(skb)) { |
| case htons(ETH_P_IP): |
| wlen += sizeof(struct iphdr); |
| if (!pskb_may_pull(skb, wlen)) |
| goto err; |
| skb->priority = ipv4_get_dsfield(ip_hdr(skb)) >> 2; |
| break; |
| |
| case htons(ETH_P_IPV6): |
| wlen += sizeof(struct ipv6hdr); |
| if (!pskb_may_pull(skb, wlen)) |
| goto err; |
| skb->priority = ipv6_get_dsfield(ipv6_hdr(skb)) >> 2; |
| break; |
| } |
| } |
| if (params->flags & SKBEDIT_F_QUEUE_MAPPING && |
| skb->dev->real_num_tx_queues > params->queue_mapping) |
| skb_set_queue_mapping(skb, params->queue_mapping); |
| if (params->flags & SKBEDIT_F_MARK) { |
| skb->mark &= ~params->mask; |
| skb->mark |= params->mark & params->mask; |
| } |
| if (params->flags & SKBEDIT_F_PTYPE) |
| skb->pkt_type = params->ptype; |
| return action; |
| |
| err: |
| qstats_drop_inc(this_cpu_ptr(d->common.cpu_qstats)); |
| return TC_ACT_SHOT; |
| } |
| |
| static const struct nla_policy skbedit_policy[TCA_SKBEDIT_MAX + 1] = { |
| [TCA_SKBEDIT_PARMS] = { .len = sizeof(struct tc_skbedit) }, |
| [TCA_SKBEDIT_PRIORITY] = { .len = sizeof(u32) }, |
| [TCA_SKBEDIT_QUEUE_MAPPING] = { .len = sizeof(u16) }, |
| [TCA_SKBEDIT_MARK] = { .len = sizeof(u32) }, |
| [TCA_SKBEDIT_PTYPE] = { .len = sizeof(u16) }, |
| [TCA_SKBEDIT_MASK] = { .len = sizeof(u32) }, |
| [TCA_SKBEDIT_FLAGS] = { .len = sizeof(u64) }, |
| }; |
| |
| static int tcf_skbedit_init(struct net *net, struct nlattr *nla, |
| struct nlattr *est, struct tc_action **a, |
| int ovr, int bind, bool rtnl_held, |
| struct tcf_proto *tp, |
| struct netlink_ext_ack *extack) |
| { |
| struct tc_action_net *tn = net_generic(net, skbedit_net_id); |
| struct tcf_skbedit_params *params_new; |
| struct nlattr *tb[TCA_SKBEDIT_MAX + 1]; |
| struct tcf_chain *goto_ch = NULL; |
| struct tc_skbedit *parm; |
| struct tcf_skbedit *d; |
| u32 flags = 0, *priority = NULL, *mark = NULL, *mask = NULL; |
| u16 *queue_mapping = NULL, *ptype = NULL; |
| bool exists = false; |
| int ret = 0, err; |
| |
| if (nla == NULL) |
| return -EINVAL; |
| |
| err = nla_parse_nested_deprecated(tb, TCA_SKBEDIT_MAX, nla, |
| skbedit_policy, NULL); |
| if (err < 0) |
| return err; |
| |
| if (tb[TCA_SKBEDIT_PARMS] == NULL) |
| return -EINVAL; |
| |
| if (tb[TCA_SKBEDIT_PRIORITY] != NULL) { |
| flags |= SKBEDIT_F_PRIORITY; |
| priority = nla_data(tb[TCA_SKBEDIT_PRIORITY]); |
| } |
| |
| if (tb[TCA_SKBEDIT_QUEUE_MAPPING] != NULL) { |
| flags |= SKBEDIT_F_QUEUE_MAPPING; |
| queue_mapping = nla_data(tb[TCA_SKBEDIT_QUEUE_MAPPING]); |
| } |
| |
| if (tb[TCA_SKBEDIT_PTYPE] != NULL) { |
| ptype = nla_data(tb[TCA_SKBEDIT_PTYPE]); |
| if (!skb_pkt_type_ok(*ptype)) |
| return -EINVAL; |
| flags |= SKBEDIT_F_PTYPE; |
| } |
| |
| if (tb[TCA_SKBEDIT_MARK] != NULL) { |
| flags |= SKBEDIT_F_MARK; |
| mark = nla_data(tb[TCA_SKBEDIT_MARK]); |
| } |
| |
| if (tb[TCA_SKBEDIT_MASK] != NULL) { |
| flags |= SKBEDIT_F_MASK; |
| mask = nla_data(tb[TCA_SKBEDIT_MASK]); |
| } |
| |
| if (tb[TCA_SKBEDIT_FLAGS] != NULL) { |
| u64 *pure_flags = nla_data(tb[TCA_SKBEDIT_FLAGS]); |
| |
| if (*pure_flags & SKBEDIT_F_INHERITDSFIELD) |
| flags |= SKBEDIT_F_INHERITDSFIELD; |
| } |
| |
| parm = nla_data(tb[TCA_SKBEDIT_PARMS]); |
| |
| err = tcf_idr_check_alloc(tn, &parm->index, a, bind); |
| if (err < 0) |
| return err; |
| exists = err; |
| if (exists && bind) |
| return 0; |
| |
| if (!flags) { |
| if (exists) |
| tcf_idr_release(*a, bind); |
| else |
| tcf_idr_cleanup(tn, parm->index); |
| return -EINVAL; |
| } |
| |
| if (!exists) { |
| ret = tcf_idr_create(tn, parm->index, est, a, |
| &act_skbedit_ops, bind, true); |
| if (ret) { |
| tcf_idr_cleanup(tn, parm->index); |
| return ret; |
| } |
| |
| d = to_skbedit(*a); |
| ret = ACT_P_CREATED; |
| } else { |
| d = to_skbedit(*a); |
| if (!ovr) { |
| tcf_idr_release(*a, bind); |
| return -EEXIST; |
| } |
| } |
| err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, extack); |
| if (err < 0) |
| goto release_idr; |
| |
| params_new = kzalloc(sizeof(*params_new), GFP_KERNEL); |
| if (unlikely(!params_new)) { |
| err = -ENOMEM; |
| goto put_chain; |
| } |
| |
| params_new->flags = flags; |
| if (flags & SKBEDIT_F_PRIORITY) |
| params_new->priority = *priority; |
| if (flags & SKBEDIT_F_QUEUE_MAPPING) |
| params_new->queue_mapping = *queue_mapping; |
| if (flags & SKBEDIT_F_MARK) |
| params_new->mark = *mark; |
| if (flags & SKBEDIT_F_PTYPE) |
| params_new->ptype = *ptype; |
| /* default behaviour is to use all the bits */ |
| params_new->mask = 0xffffffff; |
| if (flags & SKBEDIT_F_MASK) |
| params_new->mask = *mask; |
| |
| spin_lock_bh(&d->tcf_lock); |
| goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch); |
| rcu_swap_protected(d->params, params_new, |
| lockdep_is_held(&d->tcf_lock)); |
| spin_unlock_bh(&d->tcf_lock); |
| if (params_new) |
| kfree_rcu(params_new, rcu); |
| if (goto_ch) |
| tcf_chain_put_by_act(goto_ch); |
| |
| if (ret == ACT_P_CREATED) |
| tcf_idr_insert(tn, *a); |
| return ret; |
| put_chain: |
| if (goto_ch) |
| tcf_chain_put_by_act(goto_ch); |
| release_idr: |
| tcf_idr_release(*a, bind); |
| return err; |
| } |
| |
| static int tcf_skbedit_dump(struct sk_buff *skb, struct tc_action *a, |
| int bind, int ref) |
| { |
| unsigned char *b = skb_tail_pointer(skb); |
| struct tcf_skbedit *d = to_skbedit(a); |
| struct tcf_skbedit_params *params; |
| struct tc_skbedit opt = { |
| .index = d->tcf_index, |
| .refcnt = refcount_read(&d->tcf_refcnt) - ref, |
| .bindcnt = atomic_read(&d->tcf_bindcnt) - bind, |
| }; |
| u64 pure_flags = 0; |
| struct tcf_t t; |
| |
| spin_lock_bh(&d->tcf_lock); |
| params = rcu_dereference_protected(d->params, |
| lockdep_is_held(&d->tcf_lock)); |
| opt.action = d->tcf_action; |
| |
| if (nla_put(skb, TCA_SKBEDIT_PARMS, sizeof(opt), &opt)) |
| goto nla_put_failure; |
| if ((params->flags & SKBEDIT_F_PRIORITY) && |
| nla_put_u32(skb, TCA_SKBEDIT_PRIORITY, params->priority)) |
| goto nla_put_failure; |
| if ((params->flags & SKBEDIT_F_QUEUE_MAPPING) && |
| nla_put_u16(skb, TCA_SKBEDIT_QUEUE_MAPPING, params->queue_mapping)) |
| goto nla_put_failure; |
| if ((params->flags & SKBEDIT_F_MARK) && |
| nla_put_u32(skb, TCA_SKBEDIT_MARK, params->mark)) |
| goto nla_put_failure; |
| if ((params->flags & SKBEDIT_F_PTYPE) && |
| nla_put_u16(skb, TCA_SKBEDIT_PTYPE, params->ptype)) |
| goto nla_put_failure; |
| if ((params->flags & SKBEDIT_F_MASK) && |
| nla_put_u32(skb, TCA_SKBEDIT_MASK, params->mask)) |
| goto nla_put_failure; |
| if (params->flags & SKBEDIT_F_INHERITDSFIELD) |
| pure_flags |= SKBEDIT_F_INHERITDSFIELD; |
| if (pure_flags != 0 && |
| nla_put(skb, TCA_SKBEDIT_FLAGS, sizeof(pure_flags), &pure_flags)) |
| goto nla_put_failure; |
| |
| tcf_tm_dump(&t, &d->tcf_tm); |
| if (nla_put_64bit(skb, TCA_SKBEDIT_TM, sizeof(t), &t, TCA_SKBEDIT_PAD)) |
| goto nla_put_failure; |
| spin_unlock_bh(&d->tcf_lock); |
| |
| return skb->len; |
| |
| nla_put_failure: |
| spin_unlock_bh(&d->tcf_lock); |
| nlmsg_trim(skb, b); |
| return -1; |
| } |
| |
| static void tcf_skbedit_cleanup(struct tc_action *a) |
| { |
| struct tcf_skbedit *d = to_skbedit(a); |
| struct tcf_skbedit_params *params; |
| |
| params = rcu_dereference_protected(d->params, 1); |
| if (params) |
| kfree_rcu(params, rcu); |
| } |
| |
| static int tcf_skbedit_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, skbedit_net_id); |
| |
| return tcf_generic_walker(tn, skb, cb, type, ops, extack); |
| } |
| |
| static int tcf_skbedit_search(struct net *net, struct tc_action **a, u32 index) |
| { |
| struct tc_action_net *tn = net_generic(net, skbedit_net_id); |
| |
| return tcf_idr_search(tn, a, index); |
| } |
| |
| static struct tc_action_ops act_skbedit_ops = { |
| .kind = "skbedit", |
| .id = TCA_ID_SKBEDIT, |
| .owner = THIS_MODULE, |
| .act = tcf_skbedit_act, |
| .dump = tcf_skbedit_dump, |
| .init = tcf_skbedit_init, |
| .cleanup = tcf_skbedit_cleanup, |
| .walk = tcf_skbedit_walker, |
| .lookup = tcf_skbedit_search, |
| .size = sizeof(struct tcf_skbedit), |
| }; |
| |
| static __net_init int skbedit_init_net(struct net *net) |
| { |
| struct tc_action_net *tn = net_generic(net, skbedit_net_id); |
| |
| return tc_action_net_init(tn, &act_skbedit_ops); |
| } |
| |
| static void __net_exit skbedit_exit_net(struct list_head *net_list) |
| { |
| tc_action_net_exit(net_list, skbedit_net_id); |
| } |
| |
| static struct pernet_operations skbedit_net_ops = { |
| .init = skbedit_init_net, |
| .exit_batch = skbedit_exit_net, |
| .id = &skbedit_net_id, |
| .size = sizeof(struct tc_action_net), |
| }; |
| |
| MODULE_AUTHOR("Alexander Duyck, <alexander.h.duyck@intel.com>"); |
| MODULE_DESCRIPTION("SKB Editing"); |
| MODULE_LICENSE("GPL"); |
| |
| static int __init skbedit_init_module(void) |
| { |
| return tcf_register_action(&act_skbedit_ops, &skbedit_net_ops); |
| } |
| |
| static void __exit skbedit_cleanup_module(void) |
| { |
| tcf_unregister_action(&act_skbedit_ops, &skbedit_net_ops); |
| } |
| |
| module_init(skbedit_init_module); |
| module_exit(skbedit_cleanup_module); |