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-rw-r--r--net/sched/act_skbedit.c464
1 files changed, 464 insertions, 0 deletions
diff --git a/net/sched/act_skbedit.c b/net/sched/act_skbedit.c
new file mode 100644
index 0000000000..ce7008cf29
--- /dev/null
+++ b/net/sched/act_skbedit.c
@@ -0,0 +1,464 @@
+// 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 <net/tc_wrapper.h>
+
+#include <linux/tc_act/tc_skbedit.h>
+#include <net/tc_act/tc_skbedit.h>
+
+static struct tc_action_ops act_skbedit_ops;
+
+static u16 tcf_skbedit_hash(struct tcf_skbedit_params *params,
+ struct sk_buff *skb)
+{
+ u16 queue_mapping = params->queue_mapping;
+
+ if (params->flags & SKBEDIT_F_TXQ_SKBHASH) {
+ u32 hash = skb_get_hash(skb);
+
+ queue_mapping += hash % params->mapping_mod;
+ }
+
+ return netdev_cap_txqueue(skb->dev, queue_mapping);
+}
+
+TC_INDIRECT_SCOPE 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_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 (skb_protocol(skb, true)) {
+ 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) {
+#ifdef CONFIG_NET_EGRESS
+ netdev_xmit_skip_txqueue(true);
+#endif
+ skb_set_queue_mapping(skb, tcf_skbedit_hash(params, skb));
+ }
+ 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 void tcf_skbedit_stats_update(struct tc_action *a, u64 bytes,
+ u64 packets, u64 drops,
+ u64 lastuse, bool hw)
+{
+ struct tcf_skbedit *d = to_skbedit(a);
+ struct tcf_t *tm = &d->tcf_tm;
+
+ tcf_action_update_stats(a, bytes, packets, drops, hw);
+ tm->lastuse = max_t(u64, tm->lastuse, lastuse);
+}
+
+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) },
+ [TCA_SKBEDIT_QUEUE_MAPPING_MAX] = { .len = sizeof(u16) },
+};
+
+static int tcf_skbedit_init(struct net *net, struct nlattr *nla,
+ struct nlattr *est, struct tc_action **a,
+ struct tcf_proto *tp, u32 act_flags,
+ struct netlink_ext_ack *extack)
+{
+ struct tc_action_net *tn = net_generic(net, act_skbedit_ops.net_id);
+ bool bind = act_flags & TCA_ACT_FLAGS_BIND;
+ 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;
+ u16 mapping_mod = 1;
+ bool exists = false;
+ int ret = 0, err;
+ u32 index;
+
+ 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) {
+ if (is_tcf_skbedit_ingress(act_flags) &&
+ !(act_flags & TCA_ACT_FLAGS_SKIP_SW)) {
+ NL_SET_ERR_MSG_MOD(extack, "\"queue_mapping\" option on receive side is hardware only, use skip_sw");
+ return -EOPNOTSUPP;
+ }
+ 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_TXQ_SKBHASH) {
+ u16 *queue_mapping_max;
+
+ if (!tb[TCA_SKBEDIT_QUEUE_MAPPING] ||
+ !tb[TCA_SKBEDIT_QUEUE_MAPPING_MAX]) {
+ NL_SET_ERR_MSG_MOD(extack, "Missing required range of queue_mapping.");
+ return -EINVAL;
+ }
+
+ queue_mapping_max =
+ nla_data(tb[TCA_SKBEDIT_QUEUE_MAPPING_MAX]);
+ if (*queue_mapping_max < *queue_mapping) {
+ NL_SET_ERR_MSG_MOD(extack, "The range of queue_mapping is invalid, max < min.");
+ return -EINVAL;
+ }
+
+ mapping_mod = *queue_mapping_max - *queue_mapping + 1;
+ flags |= SKBEDIT_F_TXQ_SKBHASH;
+ }
+ if (*pure_flags & SKBEDIT_F_INHERITDSFIELD)
+ flags |= SKBEDIT_F_INHERITDSFIELD;
+ }
+
+ parm = nla_data(tb[TCA_SKBEDIT_PARMS]);
+ index = parm->index;
+ err = tcf_idr_check_alloc(tn, &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, index);
+ return -EINVAL;
+ }
+
+ if (!exists) {
+ ret = tcf_idr_create(tn, index, est, a,
+ &act_skbedit_ops, bind, true, act_flags);
+ if (ret) {
+ tcf_idr_cleanup(tn, index);
+ return ret;
+ }
+
+ d = to_skbedit(*a);
+ ret = ACT_P_CREATED;
+ } else {
+ d = to_skbedit(*a);
+ if (!(act_flags & TCA_ACT_FLAGS_REPLACE)) {
+ 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;
+ params_new->mapping_mod = mapping_mod;
+ }
+ 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);
+ params_new = rcu_replace_pointer(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);
+
+ 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 (params->flags & SKBEDIT_F_TXQ_SKBHASH) {
+ if (nla_put_u16(skb, TCA_SKBEDIT_QUEUE_MAPPING_MAX,
+ params->queue_mapping + params->mapping_mod - 1))
+ goto nla_put_failure;
+
+ pure_flags |= SKBEDIT_F_TXQ_SKBHASH;
+ }
+ 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 size_t tcf_skbedit_get_fill_size(const struct tc_action *act)
+{
+ return nla_total_size(sizeof(struct tc_skbedit))
+ + nla_total_size(sizeof(u32)) /* TCA_SKBEDIT_PRIORITY */
+ + nla_total_size(sizeof(u16)) /* TCA_SKBEDIT_QUEUE_MAPPING */
+ + nla_total_size(sizeof(u16)) /* TCA_SKBEDIT_QUEUE_MAPPING_MAX */
+ + nla_total_size(sizeof(u32)) /* TCA_SKBEDIT_MARK */
+ + nla_total_size(sizeof(u16)) /* TCA_SKBEDIT_PTYPE */
+ + nla_total_size(sizeof(u32)) /* TCA_SKBEDIT_MASK */
+ + nla_total_size_64bit(sizeof(u64)); /* TCA_SKBEDIT_FLAGS */
+}
+
+static int tcf_skbedit_offload_act_setup(struct tc_action *act, void *entry_data,
+ u32 *index_inc, bool bind,
+ struct netlink_ext_ack *extack)
+{
+ if (bind) {
+ struct flow_action_entry *entry = entry_data;
+
+ if (is_tcf_skbedit_mark(act)) {
+ entry->id = FLOW_ACTION_MARK;
+ entry->mark = tcf_skbedit_mark(act);
+ } else if (is_tcf_skbedit_ptype(act)) {
+ entry->id = FLOW_ACTION_PTYPE;
+ entry->ptype = tcf_skbedit_ptype(act);
+ } else if (is_tcf_skbedit_priority(act)) {
+ entry->id = FLOW_ACTION_PRIORITY;
+ entry->priority = tcf_skbedit_priority(act);
+ } else if (is_tcf_skbedit_tx_queue_mapping(act)) {
+ NL_SET_ERR_MSG_MOD(extack, "Offload not supported when \"queue_mapping\" option is used on transmit side");
+ return -EOPNOTSUPP;
+ } else if (is_tcf_skbedit_rx_queue_mapping(act)) {
+ entry->id = FLOW_ACTION_RX_QUEUE_MAPPING;
+ entry->rx_queue = tcf_skbedit_rx_queue_mapping(act);
+ } else if (is_tcf_skbedit_inheritdsfield(act)) {
+ NL_SET_ERR_MSG_MOD(extack, "Offload not supported when \"inheritdsfield\" option is used");
+ return -EOPNOTSUPP;
+ } else {
+ NL_SET_ERR_MSG_MOD(extack, "Unsupported skbedit option offload");
+ return -EOPNOTSUPP;
+ }
+ *index_inc = 1;
+ } else {
+ struct flow_offload_action *fl_action = entry_data;
+
+ if (is_tcf_skbedit_mark(act))
+ fl_action->id = FLOW_ACTION_MARK;
+ else if (is_tcf_skbedit_ptype(act))
+ fl_action->id = FLOW_ACTION_PTYPE;
+ else if (is_tcf_skbedit_priority(act))
+ fl_action->id = FLOW_ACTION_PRIORITY;
+ else if (is_tcf_skbedit_rx_queue_mapping(act))
+ fl_action->id = FLOW_ACTION_RX_QUEUE_MAPPING;
+ else
+ return -EOPNOTSUPP;
+ }
+
+ return 0;
+}
+
+static struct tc_action_ops act_skbedit_ops = {
+ .kind = "skbedit",
+ .id = TCA_ID_SKBEDIT,
+ .owner = THIS_MODULE,
+ .act = tcf_skbedit_act,
+ .stats_update = tcf_skbedit_stats_update,
+ .dump = tcf_skbedit_dump,
+ .init = tcf_skbedit_init,
+ .cleanup = tcf_skbedit_cleanup,
+ .get_fill_size = tcf_skbedit_get_fill_size,
+ .offload_act_setup = tcf_skbedit_offload_act_setup,
+ .size = sizeof(struct tcf_skbedit),
+};
+
+static __net_init int skbedit_init_net(struct net *net)
+{
+ struct tc_action_net *tn = net_generic(net, act_skbedit_ops.net_id);
+
+ return tc_action_net_init(net, tn, &act_skbedit_ops);
+}
+
+static void __net_exit skbedit_exit_net(struct list_head *net_list)
+{
+ tc_action_net_exit(net_list, act_skbedit_ops.net_id);
+}
+
+static struct pernet_operations skbedit_net_ops = {
+ .init = skbedit_init_net,
+ .exit_batch = skbedit_exit_net,
+ .id = &act_skbedit_ops.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);