465 lines
13 KiB
C
465 lines
13 KiB
C
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// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (c) 2008, Intel Corporation.
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*
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* Author: Alexander Duyck <alexander.h.duyck@intel.com>
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/skbuff.h>
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#include <linux/rtnetlink.h>
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#include <net/netlink.h>
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#include <net/pkt_sched.h>
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#include <net/ip.h>
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#include <net/ipv6.h>
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#include <net/dsfield.h>
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#include <net/pkt_cls.h>
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#include <net/tc_wrapper.h>
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#include <linux/tc_act/tc_skbedit.h>
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#include <net/tc_act/tc_skbedit.h>
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static struct tc_action_ops act_skbedit_ops;
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static u16 tcf_skbedit_hash(struct tcf_skbedit_params *params,
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struct sk_buff *skb)
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{
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u16 queue_mapping = params->queue_mapping;
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if (params->flags & SKBEDIT_F_TXQ_SKBHASH) {
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u32 hash = skb_get_hash(skb);
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queue_mapping += hash % params->mapping_mod;
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}
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return netdev_cap_txqueue(skb->dev, queue_mapping);
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}
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TC_INDIRECT_SCOPE int tcf_skbedit_act(struct sk_buff *skb,
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const struct tc_action *a,
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struct tcf_result *res)
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{
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struct tcf_skbedit *d = to_skbedit(a);
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struct tcf_skbedit_params *params;
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int action;
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tcf_lastuse_update(&d->tcf_tm);
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bstats_update(this_cpu_ptr(d->common.cpu_bstats), skb);
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params = rcu_dereference_bh(d->params);
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action = READ_ONCE(d->tcf_action);
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if (params->flags & SKBEDIT_F_PRIORITY)
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skb->priority = params->priority;
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if (params->flags & SKBEDIT_F_INHERITDSFIELD) {
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int wlen = skb_network_offset(skb);
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switch (skb_protocol(skb, true)) {
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case htons(ETH_P_IP):
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wlen += sizeof(struct iphdr);
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if (!pskb_may_pull(skb, wlen))
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goto err;
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skb->priority = ipv4_get_dsfield(ip_hdr(skb)) >> 2;
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break;
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case htons(ETH_P_IPV6):
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wlen += sizeof(struct ipv6hdr);
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if (!pskb_may_pull(skb, wlen))
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goto err;
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skb->priority = ipv6_get_dsfield(ipv6_hdr(skb)) >> 2;
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break;
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}
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}
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if (params->flags & SKBEDIT_F_QUEUE_MAPPING &&
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skb->dev->real_num_tx_queues > params->queue_mapping) {
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#ifdef CONFIG_NET_EGRESS
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netdev_xmit_skip_txqueue(true);
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#endif
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skb_set_queue_mapping(skb, tcf_skbedit_hash(params, skb));
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}
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if (params->flags & SKBEDIT_F_MARK) {
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skb->mark &= ~params->mask;
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skb->mark |= params->mark & params->mask;
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}
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if (params->flags & SKBEDIT_F_PTYPE)
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skb->pkt_type = params->ptype;
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return action;
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err:
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qstats_drop_inc(this_cpu_ptr(d->common.cpu_qstats));
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return TC_ACT_SHOT;
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}
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static void tcf_skbedit_stats_update(struct tc_action *a, u64 bytes,
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u64 packets, u64 drops,
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u64 lastuse, bool hw)
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{
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struct tcf_skbedit *d = to_skbedit(a);
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struct tcf_t *tm = &d->tcf_tm;
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tcf_action_update_stats(a, bytes, packets, drops, hw);
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tm->lastuse = max_t(u64, tm->lastuse, lastuse);
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}
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static const struct nla_policy skbedit_policy[TCA_SKBEDIT_MAX + 1] = {
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[TCA_SKBEDIT_PARMS] = { .len = sizeof(struct tc_skbedit) },
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[TCA_SKBEDIT_PRIORITY] = { .len = sizeof(u32) },
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[TCA_SKBEDIT_QUEUE_MAPPING] = { .len = sizeof(u16) },
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[TCA_SKBEDIT_MARK] = { .len = sizeof(u32) },
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[TCA_SKBEDIT_PTYPE] = { .len = sizeof(u16) },
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[TCA_SKBEDIT_MASK] = { .len = sizeof(u32) },
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[TCA_SKBEDIT_FLAGS] = { .len = sizeof(u64) },
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[TCA_SKBEDIT_QUEUE_MAPPING_MAX] = { .len = sizeof(u16) },
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};
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static int tcf_skbedit_init(struct net *net, struct nlattr *nla,
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struct nlattr *est, struct tc_action **a,
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struct tcf_proto *tp, u32 act_flags,
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struct netlink_ext_ack *extack)
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{
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struct tc_action_net *tn = net_generic(net, act_skbedit_ops.net_id);
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bool bind = act_flags & TCA_ACT_FLAGS_BIND;
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struct tcf_skbedit_params *params_new;
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struct nlattr *tb[TCA_SKBEDIT_MAX + 1];
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struct tcf_chain *goto_ch = NULL;
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struct tc_skbedit *parm;
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struct tcf_skbedit *d;
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u32 flags = 0, *priority = NULL, *mark = NULL, *mask = NULL;
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u16 *queue_mapping = NULL, *ptype = NULL;
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u16 mapping_mod = 1;
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bool exists = false;
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int ret = 0, err;
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u32 index;
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if (nla == NULL)
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return -EINVAL;
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err = nla_parse_nested_deprecated(tb, TCA_SKBEDIT_MAX, nla,
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skbedit_policy, NULL);
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if (err < 0)
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return err;
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if (tb[TCA_SKBEDIT_PARMS] == NULL)
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return -EINVAL;
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if (tb[TCA_SKBEDIT_PRIORITY] != NULL) {
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flags |= SKBEDIT_F_PRIORITY;
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priority = nla_data(tb[TCA_SKBEDIT_PRIORITY]);
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}
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if (tb[TCA_SKBEDIT_QUEUE_MAPPING] != NULL) {
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if (is_tcf_skbedit_ingress(act_flags) &&
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!(act_flags & TCA_ACT_FLAGS_SKIP_SW)) {
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NL_SET_ERR_MSG_MOD(extack, "\"queue_mapping\" option on receive side is hardware only, use skip_sw");
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return -EOPNOTSUPP;
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}
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flags |= SKBEDIT_F_QUEUE_MAPPING;
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queue_mapping = nla_data(tb[TCA_SKBEDIT_QUEUE_MAPPING]);
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}
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if (tb[TCA_SKBEDIT_PTYPE] != NULL) {
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ptype = nla_data(tb[TCA_SKBEDIT_PTYPE]);
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if (!skb_pkt_type_ok(*ptype))
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return -EINVAL;
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flags |= SKBEDIT_F_PTYPE;
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}
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if (tb[TCA_SKBEDIT_MARK] != NULL) {
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flags |= SKBEDIT_F_MARK;
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mark = nla_data(tb[TCA_SKBEDIT_MARK]);
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}
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if (tb[TCA_SKBEDIT_MASK] != NULL) {
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flags |= SKBEDIT_F_MASK;
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mask = nla_data(tb[TCA_SKBEDIT_MASK]);
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}
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if (tb[TCA_SKBEDIT_FLAGS] != NULL) {
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u64 *pure_flags = nla_data(tb[TCA_SKBEDIT_FLAGS]);
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if (*pure_flags & SKBEDIT_F_TXQ_SKBHASH) {
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u16 *queue_mapping_max;
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if (!tb[TCA_SKBEDIT_QUEUE_MAPPING] ||
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!tb[TCA_SKBEDIT_QUEUE_MAPPING_MAX]) {
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NL_SET_ERR_MSG_MOD(extack, "Missing required range of queue_mapping.");
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return -EINVAL;
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}
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queue_mapping_max =
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nla_data(tb[TCA_SKBEDIT_QUEUE_MAPPING_MAX]);
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if (*queue_mapping_max < *queue_mapping) {
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NL_SET_ERR_MSG_MOD(extack, "The range of queue_mapping is invalid, max < min.");
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return -EINVAL;
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}
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mapping_mod = *queue_mapping_max - *queue_mapping + 1;
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flags |= SKBEDIT_F_TXQ_SKBHASH;
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}
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if (*pure_flags & SKBEDIT_F_INHERITDSFIELD)
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flags |= SKBEDIT_F_INHERITDSFIELD;
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}
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parm = nla_data(tb[TCA_SKBEDIT_PARMS]);
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index = parm->index;
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err = tcf_idr_check_alloc(tn, &index, a, bind);
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if (err < 0)
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return err;
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exists = err;
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if (exists && bind)
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return 0;
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if (!flags) {
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if (exists)
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tcf_idr_release(*a, bind);
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else
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tcf_idr_cleanup(tn, index);
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return -EINVAL;
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}
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if (!exists) {
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ret = tcf_idr_create(tn, index, est, a,
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&act_skbedit_ops, bind, true, act_flags);
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if (ret) {
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tcf_idr_cleanup(tn, index);
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return ret;
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}
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d = to_skbedit(*a);
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ret = ACT_P_CREATED;
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} else {
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d = to_skbedit(*a);
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if (!(act_flags & TCA_ACT_FLAGS_REPLACE)) {
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tcf_idr_release(*a, bind);
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return -EEXIST;
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}
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}
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err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, extack);
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if (err < 0)
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goto release_idr;
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params_new = kzalloc(sizeof(*params_new), GFP_KERNEL);
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if (unlikely(!params_new)) {
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err = -ENOMEM;
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goto put_chain;
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}
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params_new->flags = flags;
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if (flags & SKBEDIT_F_PRIORITY)
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params_new->priority = *priority;
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if (flags & SKBEDIT_F_QUEUE_MAPPING) {
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params_new->queue_mapping = *queue_mapping;
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params_new->mapping_mod = mapping_mod;
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}
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if (flags & SKBEDIT_F_MARK)
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params_new->mark = *mark;
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if (flags & SKBEDIT_F_PTYPE)
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params_new->ptype = *ptype;
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/* default behaviour is to use all the bits */
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params_new->mask = 0xffffffff;
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if (flags & SKBEDIT_F_MASK)
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params_new->mask = *mask;
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spin_lock_bh(&d->tcf_lock);
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goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch);
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params_new = rcu_replace_pointer(d->params, params_new,
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lockdep_is_held(&d->tcf_lock));
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spin_unlock_bh(&d->tcf_lock);
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if (params_new)
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kfree_rcu(params_new, rcu);
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if (goto_ch)
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tcf_chain_put_by_act(goto_ch);
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return ret;
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put_chain:
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if (goto_ch)
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tcf_chain_put_by_act(goto_ch);
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release_idr:
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tcf_idr_release(*a, bind);
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return err;
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}
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static int tcf_skbedit_dump(struct sk_buff *skb, struct tc_action *a,
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int bind, int ref)
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{
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unsigned char *b = skb_tail_pointer(skb);
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struct tcf_skbedit *d = to_skbedit(a);
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struct tcf_skbedit_params *params;
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struct tc_skbedit opt = {
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.index = d->tcf_index,
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.refcnt = refcount_read(&d->tcf_refcnt) - ref,
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.bindcnt = atomic_read(&d->tcf_bindcnt) - bind,
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};
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u64 pure_flags = 0;
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struct tcf_t t;
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spin_lock_bh(&d->tcf_lock);
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params = rcu_dereference_protected(d->params,
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lockdep_is_held(&d->tcf_lock));
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opt.action = d->tcf_action;
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if (nla_put(skb, TCA_SKBEDIT_PARMS, sizeof(opt), &opt))
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goto nla_put_failure;
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if ((params->flags & SKBEDIT_F_PRIORITY) &&
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nla_put_u32(skb, TCA_SKBEDIT_PRIORITY, params->priority))
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goto nla_put_failure;
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if ((params->flags & SKBEDIT_F_QUEUE_MAPPING) &&
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nla_put_u16(skb, TCA_SKBEDIT_QUEUE_MAPPING, params->queue_mapping))
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goto nla_put_failure;
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if ((params->flags & SKBEDIT_F_MARK) &&
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nla_put_u32(skb, TCA_SKBEDIT_MARK, params->mark))
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goto nla_put_failure;
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if ((params->flags & SKBEDIT_F_PTYPE) &&
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nla_put_u16(skb, TCA_SKBEDIT_PTYPE, params->ptype))
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goto nla_put_failure;
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if ((params->flags & SKBEDIT_F_MASK) &&
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nla_put_u32(skb, TCA_SKBEDIT_MASK, params->mask))
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goto nla_put_failure;
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if (params->flags & SKBEDIT_F_INHERITDSFIELD)
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pure_flags |= SKBEDIT_F_INHERITDSFIELD;
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if (params->flags & SKBEDIT_F_TXQ_SKBHASH) {
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if (nla_put_u16(skb, TCA_SKBEDIT_QUEUE_MAPPING_MAX,
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params->queue_mapping + params->mapping_mod - 1))
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goto nla_put_failure;
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pure_flags |= SKBEDIT_F_TXQ_SKBHASH;
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}
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if (pure_flags != 0 &&
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nla_put(skb, TCA_SKBEDIT_FLAGS, sizeof(pure_flags), &pure_flags))
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goto nla_put_failure;
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tcf_tm_dump(&t, &d->tcf_tm);
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if (nla_put_64bit(skb, TCA_SKBEDIT_TM, sizeof(t), &t, TCA_SKBEDIT_PAD))
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goto nla_put_failure;
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spin_unlock_bh(&d->tcf_lock);
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return skb->len;
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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);
|