mirror of
https://github.com/torvalds/linux.git
synced 2024-12-05 10:32:35 +00:00
fecc51559a
Cross-merge networking fixes after downstream PR. Conflicts: net/ipv4/udp.cf796feabb9
("udp: add local "peek offset enabled" flag")56667da739
("net: implement lockless setsockopt(SO_PEEK_OFF)") Adjacent changes: net/unix/garbage.caa82ac51d6
("af_unix: Drop oob_skb ref before purging queue in GC.")11498715f2
("af_unix: Remove io_uring code for GC.") Signed-off-by: Jakub Kicinski <kuba@kernel.org>
685 lines
17 KiB
C
685 lines
17 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* net/sched/act_mirred.c packet mirroring and redirect actions
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*
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* Authors: Jamal Hadi Salim (2002-4)
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*
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* TODO: Add ingress support (and socket redirect support)
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*/
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/string.h>
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#include <linux/errno.h>
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#include <linux/skbuff.h>
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#include <linux/rtnetlink.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/gfp.h>
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#include <linux/if_arp.h>
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#include <net/net_namespace.h>
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#include <net/netlink.h>
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#include <net/dst.h>
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#include <net/pkt_sched.h>
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#include <net/pkt_cls.h>
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#include <linux/tc_act/tc_mirred.h>
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#include <net/tc_act/tc_mirred.h>
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#include <net/tc_wrapper.h>
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static LIST_HEAD(mirred_list);
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static DEFINE_SPINLOCK(mirred_list_lock);
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#define MIRRED_NEST_LIMIT 4
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static DEFINE_PER_CPU(unsigned int, mirred_nest_level);
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static bool tcf_mirred_is_act_redirect(int action)
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{
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return action == TCA_EGRESS_REDIR || action == TCA_INGRESS_REDIR;
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}
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static bool tcf_mirred_act_wants_ingress(int action)
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{
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switch (action) {
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case TCA_EGRESS_REDIR:
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case TCA_EGRESS_MIRROR:
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return false;
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case TCA_INGRESS_REDIR:
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case TCA_INGRESS_MIRROR:
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return true;
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default:
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BUG();
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}
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}
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static bool tcf_mirred_can_reinsert(int action)
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{
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switch (action) {
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case TC_ACT_SHOT:
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case TC_ACT_STOLEN:
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case TC_ACT_QUEUED:
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case TC_ACT_TRAP:
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return true;
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}
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return false;
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}
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static struct net_device *tcf_mirred_dev_dereference(struct tcf_mirred *m)
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{
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return rcu_dereference_protected(m->tcfm_dev,
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lockdep_is_held(&m->tcf_lock));
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}
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static void tcf_mirred_release(struct tc_action *a)
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{
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struct tcf_mirred *m = to_mirred(a);
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struct net_device *dev;
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spin_lock(&mirred_list_lock);
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list_del(&m->tcfm_list);
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spin_unlock(&mirred_list_lock);
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/* last reference to action, no need to lock */
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dev = rcu_dereference_protected(m->tcfm_dev, 1);
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netdev_put(dev, &m->tcfm_dev_tracker);
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}
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static const struct nla_policy mirred_policy[TCA_MIRRED_MAX + 1] = {
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[TCA_MIRRED_PARMS] = { .len = sizeof(struct tc_mirred) },
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[TCA_MIRRED_BLOCKID] = NLA_POLICY_MIN(NLA_U32, 1),
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};
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static struct tc_action_ops act_mirred_ops;
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static void tcf_mirred_replace_dev(struct tcf_mirred *m,
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struct net_device *ndev)
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{
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struct net_device *odev;
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odev = rcu_replace_pointer(m->tcfm_dev, ndev,
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lockdep_is_held(&m->tcf_lock));
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netdev_put(odev, &m->tcfm_dev_tracker);
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}
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static int tcf_mirred_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,
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u32 flags, struct netlink_ext_ack *extack)
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{
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struct tc_action_net *tn = net_generic(net, act_mirred_ops.net_id);
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bool bind = flags & TCA_ACT_FLAGS_BIND;
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struct nlattr *tb[TCA_MIRRED_MAX + 1];
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struct tcf_chain *goto_ch = NULL;
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bool mac_header_xmit = false;
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struct tc_mirred *parm;
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struct tcf_mirred *m;
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bool exists = false;
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int ret, err;
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u32 index;
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if (!nla) {
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NL_SET_ERR_MSG_MOD(extack, "Mirred requires attributes to be passed");
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return -EINVAL;
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}
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ret = nla_parse_nested_deprecated(tb, TCA_MIRRED_MAX, nla,
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mirred_policy, extack);
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if (ret < 0)
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return ret;
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if (!tb[TCA_MIRRED_PARMS]) {
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NL_SET_ERR_MSG_MOD(extack, "Missing required mirred parameters");
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return -EINVAL;
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}
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parm = nla_data(tb[TCA_MIRRED_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 ACT_P_BOUND;
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if (tb[TCA_MIRRED_BLOCKID] && parm->ifindex) {
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NL_SET_ERR_MSG_MOD(extack,
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"Cannot specify Block ID and dev simultaneously");
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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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switch (parm->eaction) {
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case TCA_EGRESS_MIRROR:
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case TCA_EGRESS_REDIR:
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case TCA_INGRESS_REDIR:
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case TCA_INGRESS_MIRROR:
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break;
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default:
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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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NL_SET_ERR_MSG_MOD(extack, "Unknown mirred option");
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return -EINVAL;
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}
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if (!exists) {
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if (!parm->ifindex && !tb[TCA_MIRRED_BLOCKID]) {
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tcf_idr_cleanup(tn, index);
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NL_SET_ERR_MSG_MOD(extack,
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"Must specify device or block");
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return -EINVAL;
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}
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ret = tcf_idr_create_from_flags(tn, index, est, a,
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&act_mirred_ops, bind, 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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ret = ACT_P_CREATED;
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} else if (!(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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m = to_mirred(*a);
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if (ret == ACT_P_CREATED)
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INIT_LIST_HEAD(&m->tcfm_list);
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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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spin_lock_bh(&m->tcf_lock);
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if (parm->ifindex) {
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struct net_device *ndev;
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ndev = dev_get_by_index(net, parm->ifindex);
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if (!ndev) {
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spin_unlock_bh(&m->tcf_lock);
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err = -ENODEV;
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goto put_chain;
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}
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mac_header_xmit = dev_is_mac_header_xmit(ndev);
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tcf_mirred_replace_dev(m, ndev);
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netdev_tracker_alloc(ndev, &m->tcfm_dev_tracker, GFP_ATOMIC);
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m->tcfm_mac_header_xmit = mac_header_xmit;
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m->tcfm_blockid = 0;
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} else if (tb[TCA_MIRRED_BLOCKID]) {
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tcf_mirred_replace_dev(m, NULL);
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m->tcfm_mac_header_xmit = false;
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m->tcfm_blockid = nla_get_u32(tb[TCA_MIRRED_BLOCKID]);
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}
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goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch);
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m->tcfm_eaction = parm->eaction;
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spin_unlock_bh(&m->tcf_lock);
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if (goto_ch)
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tcf_chain_put_by_act(goto_ch);
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if (ret == ACT_P_CREATED) {
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spin_lock(&mirred_list_lock);
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list_add(&m->tcfm_list, &mirred_list);
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spin_unlock(&mirred_list_lock);
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}
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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
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tcf_mirred_forward(bool at_ingress, bool want_ingress, struct sk_buff *skb)
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{
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int err;
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if (!want_ingress)
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err = tcf_dev_queue_xmit(skb, dev_queue_xmit);
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else if (!at_ingress)
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err = netif_rx(skb);
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else
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err = netif_receive_skb(skb);
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return err;
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}
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static int tcf_mirred_to_dev(struct sk_buff *skb, struct tcf_mirred *m,
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struct net_device *dev,
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const bool m_mac_header_xmit, int m_eaction,
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int retval)
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{
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struct sk_buff *skb_to_send = skb;
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bool want_ingress;
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bool is_redirect;
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bool expects_nh;
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bool at_ingress;
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bool dont_clone;
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int mac_len;
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bool at_nh;
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int err;
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is_redirect = tcf_mirred_is_act_redirect(m_eaction);
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if (unlikely(!(dev->flags & IFF_UP)) || !netif_carrier_ok(dev)) {
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net_notice_ratelimited("tc mirred to Houston: device %s is down\n",
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dev->name);
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goto err_cant_do;
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}
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/* we could easily avoid the clone only if called by ingress and clsact;
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* since we can't easily detect the clsact caller, skip clone only for
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* ingress - that covers the TC S/W datapath.
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*/
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at_ingress = skb_at_tc_ingress(skb);
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dont_clone = skb_at_tc_ingress(skb) && is_redirect &&
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tcf_mirred_can_reinsert(retval);
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if (!dont_clone) {
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skb_to_send = skb_clone(skb, GFP_ATOMIC);
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if (!skb_to_send)
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goto err_cant_do;
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}
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want_ingress = tcf_mirred_act_wants_ingress(m_eaction);
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/* All mirred/redirected skbs should clear previous ct info */
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nf_reset_ct(skb_to_send);
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if (want_ingress && !at_ingress) /* drop dst for egress -> ingress */
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skb_dst_drop(skb_to_send);
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expects_nh = want_ingress || !m_mac_header_xmit;
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at_nh = skb->data == skb_network_header(skb);
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if (at_nh != expects_nh) {
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mac_len = at_ingress ? skb->mac_len :
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skb_network_offset(skb);
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if (expects_nh) {
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/* target device/action expect data at nh */
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skb_pull_rcsum(skb_to_send, mac_len);
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} else {
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/* target device/action expect data at mac */
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skb_push_rcsum(skb_to_send, mac_len);
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}
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}
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skb_to_send->skb_iif = skb->dev->ifindex;
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skb_to_send->dev = dev;
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if (is_redirect) {
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if (skb == skb_to_send)
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retval = TC_ACT_CONSUMED;
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skb_set_redirected(skb_to_send, skb_to_send->tc_at_ingress);
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err = tcf_mirred_forward(at_ingress, want_ingress, skb_to_send);
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} else {
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err = tcf_mirred_forward(at_ingress, want_ingress, skb_to_send);
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}
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if (err)
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tcf_action_inc_overlimit_qstats(&m->common);
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return retval;
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err_cant_do:
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if (is_redirect)
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retval = TC_ACT_SHOT;
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tcf_action_inc_overlimit_qstats(&m->common);
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return retval;
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}
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static int tcf_blockcast_redir(struct sk_buff *skb, struct tcf_mirred *m,
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struct tcf_block *block, int m_eaction,
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const u32 exception_ifindex, int retval)
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{
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struct net_device *dev_prev = NULL;
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struct net_device *dev = NULL;
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unsigned long index;
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int mirred_eaction;
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mirred_eaction = tcf_mirred_act_wants_ingress(m_eaction) ?
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TCA_INGRESS_MIRROR : TCA_EGRESS_MIRROR;
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xa_for_each(&block->ports, index, dev) {
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if (index == exception_ifindex)
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continue;
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if (!dev_prev)
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goto assign_prev;
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tcf_mirred_to_dev(skb, m, dev_prev,
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dev_is_mac_header_xmit(dev),
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mirred_eaction, retval);
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assign_prev:
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dev_prev = dev;
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}
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if (dev_prev)
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return tcf_mirred_to_dev(skb, m, dev_prev,
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dev_is_mac_header_xmit(dev_prev),
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m_eaction, retval);
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return retval;
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}
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static int tcf_blockcast_mirror(struct sk_buff *skb, struct tcf_mirred *m,
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struct tcf_block *block, int m_eaction,
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const u32 exception_ifindex, int retval)
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{
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struct net_device *dev = NULL;
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unsigned long index;
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xa_for_each(&block->ports, index, dev) {
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if (index == exception_ifindex)
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continue;
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tcf_mirred_to_dev(skb, m, dev,
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dev_is_mac_header_xmit(dev),
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m_eaction, retval);
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}
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return retval;
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}
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static int tcf_blockcast(struct sk_buff *skb, struct tcf_mirred *m,
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const u32 blockid, struct tcf_result *res,
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int retval)
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{
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const u32 exception_ifindex = skb->dev->ifindex;
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struct tcf_block *block;
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bool is_redirect;
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int m_eaction;
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m_eaction = READ_ONCE(m->tcfm_eaction);
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is_redirect = tcf_mirred_is_act_redirect(m_eaction);
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/* we are already under rcu protection, so can call block lookup
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* directly.
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*/
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block = tcf_block_lookup(dev_net(skb->dev), blockid);
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if (!block || xa_empty(&block->ports)) {
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tcf_action_inc_overlimit_qstats(&m->common);
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return retval;
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}
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if (is_redirect)
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return tcf_blockcast_redir(skb, m, block, m_eaction,
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exception_ifindex, retval);
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/* If it's not redirect, it is mirror */
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return tcf_blockcast_mirror(skb, m, block, m_eaction, exception_ifindex,
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retval);
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}
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TC_INDIRECT_SCOPE int tcf_mirred_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_mirred *m = to_mirred(a);
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int retval = READ_ONCE(m->tcf_action);
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unsigned int nest_level;
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bool m_mac_header_xmit;
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struct net_device *dev;
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int m_eaction;
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u32 blockid;
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nest_level = __this_cpu_inc_return(mirred_nest_level);
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if (unlikely(nest_level > MIRRED_NEST_LIMIT)) {
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net_warn_ratelimited("Packet exceeded mirred recursion limit on dev %s\n",
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netdev_name(skb->dev));
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retval = TC_ACT_SHOT;
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goto dec_nest_level;
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}
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tcf_lastuse_update(&m->tcf_tm);
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tcf_action_update_bstats(&m->common, skb);
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blockid = READ_ONCE(m->tcfm_blockid);
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if (blockid) {
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retval = tcf_blockcast(skb, m, blockid, res, retval);
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goto dec_nest_level;
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}
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dev = rcu_dereference_bh(m->tcfm_dev);
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if (unlikely(!dev)) {
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pr_notice_once("tc mirred: target device is gone\n");
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tcf_action_inc_overlimit_qstats(&m->common);
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goto dec_nest_level;
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}
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m_mac_header_xmit = READ_ONCE(m->tcfm_mac_header_xmit);
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m_eaction = READ_ONCE(m->tcfm_eaction);
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retval = tcf_mirred_to_dev(skb, m, dev, m_mac_header_xmit, m_eaction,
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retval);
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dec_nest_level:
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__this_cpu_dec(mirred_nest_level);
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return retval;
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}
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static void tcf_stats_update(struct tc_action *a, u64 bytes, u64 packets,
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u64 drops, u64 lastuse, bool hw)
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{
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struct tcf_mirred *m = to_mirred(a);
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struct tcf_t *tm = &m->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 int tcf_mirred_dump(struct sk_buff *skb, struct tc_action *a, int bind,
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int ref)
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{
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unsigned char *b = skb_tail_pointer(skb);
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struct tcf_mirred *m = to_mirred(a);
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struct tc_mirred opt = {
|
|
.index = m->tcf_index,
|
|
.refcnt = refcount_read(&m->tcf_refcnt) - ref,
|
|
.bindcnt = atomic_read(&m->tcf_bindcnt) - bind,
|
|
};
|
|
struct net_device *dev;
|
|
struct tcf_t t;
|
|
u32 blockid;
|
|
|
|
spin_lock_bh(&m->tcf_lock);
|
|
opt.action = m->tcf_action;
|
|
opt.eaction = m->tcfm_eaction;
|
|
dev = tcf_mirred_dev_dereference(m);
|
|
if (dev)
|
|
opt.ifindex = dev->ifindex;
|
|
|
|
if (nla_put(skb, TCA_MIRRED_PARMS, sizeof(opt), &opt))
|
|
goto nla_put_failure;
|
|
|
|
blockid = m->tcfm_blockid;
|
|
if (blockid && nla_put_u32(skb, TCA_MIRRED_BLOCKID, blockid))
|
|
goto nla_put_failure;
|
|
|
|
tcf_tm_dump(&t, &m->tcf_tm);
|
|
if (nla_put_64bit(skb, TCA_MIRRED_TM, sizeof(t), &t, TCA_MIRRED_PAD))
|
|
goto nla_put_failure;
|
|
spin_unlock_bh(&m->tcf_lock);
|
|
|
|
return skb->len;
|
|
|
|
nla_put_failure:
|
|
spin_unlock_bh(&m->tcf_lock);
|
|
nlmsg_trim(skb, b);
|
|
return -1;
|
|
}
|
|
|
|
static int mirred_device_event(struct notifier_block *unused,
|
|
unsigned long event, void *ptr)
|
|
{
|
|
struct net_device *dev = netdev_notifier_info_to_dev(ptr);
|
|
struct tcf_mirred *m;
|
|
|
|
ASSERT_RTNL();
|
|
if (event == NETDEV_UNREGISTER) {
|
|
spin_lock(&mirred_list_lock);
|
|
list_for_each_entry(m, &mirred_list, tcfm_list) {
|
|
spin_lock_bh(&m->tcf_lock);
|
|
if (tcf_mirred_dev_dereference(m) == dev) {
|
|
netdev_put(dev, &m->tcfm_dev_tracker);
|
|
/* Note : no rcu grace period necessary, as
|
|
* net_device are already rcu protected.
|
|
*/
|
|
RCU_INIT_POINTER(m->tcfm_dev, NULL);
|
|
}
|
|
spin_unlock_bh(&m->tcf_lock);
|
|
}
|
|
spin_unlock(&mirred_list_lock);
|
|
}
|
|
|
|
return NOTIFY_DONE;
|
|
}
|
|
|
|
static struct notifier_block mirred_device_notifier = {
|
|
.notifier_call = mirred_device_event,
|
|
};
|
|
|
|
static void tcf_mirred_dev_put(void *priv)
|
|
{
|
|
struct net_device *dev = priv;
|
|
|
|
dev_put(dev);
|
|
}
|
|
|
|
static struct net_device *
|
|
tcf_mirred_get_dev(const struct tc_action *a,
|
|
tc_action_priv_destructor *destructor)
|
|
{
|
|
struct tcf_mirred *m = to_mirred(a);
|
|
struct net_device *dev;
|
|
|
|
rcu_read_lock();
|
|
dev = rcu_dereference(m->tcfm_dev);
|
|
if (dev) {
|
|
dev_hold(dev);
|
|
*destructor = tcf_mirred_dev_put;
|
|
}
|
|
rcu_read_unlock();
|
|
|
|
return dev;
|
|
}
|
|
|
|
static size_t tcf_mirred_get_fill_size(const struct tc_action *act)
|
|
{
|
|
return nla_total_size(sizeof(struct tc_mirred));
|
|
}
|
|
|
|
static void tcf_offload_mirred_get_dev(struct flow_action_entry *entry,
|
|
const struct tc_action *act)
|
|
{
|
|
entry->dev = act->ops->get_dev(act, &entry->destructor);
|
|
if (!entry->dev)
|
|
return;
|
|
entry->destructor_priv = entry->dev;
|
|
}
|
|
|
|
static int tcf_mirred_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_mirred_egress_redirect(act)) {
|
|
entry->id = FLOW_ACTION_REDIRECT;
|
|
tcf_offload_mirred_get_dev(entry, act);
|
|
} else if (is_tcf_mirred_egress_mirror(act)) {
|
|
entry->id = FLOW_ACTION_MIRRED;
|
|
tcf_offload_mirred_get_dev(entry, act);
|
|
} else if (is_tcf_mirred_ingress_redirect(act)) {
|
|
entry->id = FLOW_ACTION_REDIRECT_INGRESS;
|
|
tcf_offload_mirred_get_dev(entry, act);
|
|
} else if (is_tcf_mirred_ingress_mirror(act)) {
|
|
entry->id = FLOW_ACTION_MIRRED_INGRESS;
|
|
tcf_offload_mirred_get_dev(entry, act);
|
|
} else {
|
|
NL_SET_ERR_MSG_MOD(extack, "Unsupported mirred offload");
|
|
return -EOPNOTSUPP;
|
|
}
|
|
*index_inc = 1;
|
|
} else {
|
|
struct flow_offload_action *fl_action = entry_data;
|
|
|
|
if (is_tcf_mirred_egress_redirect(act))
|
|
fl_action->id = FLOW_ACTION_REDIRECT;
|
|
else if (is_tcf_mirred_egress_mirror(act))
|
|
fl_action->id = FLOW_ACTION_MIRRED;
|
|
else if (is_tcf_mirred_ingress_redirect(act))
|
|
fl_action->id = FLOW_ACTION_REDIRECT_INGRESS;
|
|
else if (is_tcf_mirred_ingress_mirror(act))
|
|
fl_action->id = FLOW_ACTION_MIRRED_INGRESS;
|
|
else
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct tc_action_ops act_mirred_ops = {
|
|
.kind = "mirred",
|
|
.id = TCA_ID_MIRRED,
|
|
.owner = THIS_MODULE,
|
|
.act = tcf_mirred_act,
|
|
.stats_update = tcf_stats_update,
|
|
.dump = tcf_mirred_dump,
|
|
.cleanup = tcf_mirred_release,
|
|
.init = tcf_mirred_init,
|
|
.get_fill_size = tcf_mirred_get_fill_size,
|
|
.offload_act_setup = tcf_mirred_offload_act_setup,
|
|
.size = sizeof(struct tcf_mirred),
|
|
.get_dev = tcf_mirred_get_dev,
|
|
};
|
|
MODULE_ALIAS_NET_ACT("mirred");
|
|
|
|
static __net_init int mirred_init_net(struct net *net)
|
|
{
|
|
struct tc_action_net *tn = net_generic(net, act_mirred_ops.net_id);
|
|
|
|
return tc_action_net_init(net, tn, &act_mirred_ops);
|
|
}
|
|
|
|
static void __net_exit mirred_exit_net(struct list_head *net_list)
|
|
{
|
|
tc_action_net_exit(net_list, act_mirred_ops.net_id);
|
|
}
|
|
|
|
static struct pernet_operations mirred_net_ops = {
|
|
.init = mirred_init_net,
|
|
.exit_batch = mirred_exit_net,
|
|
.id = &act_mirred_ops.net_id,
|
|
.size = sizeof(struct tc_action_net),
|
|
};
|
|
|
|
MODULE_AUTHOR("Jamal Hadi Salim(2002)");
|
|
MODULE_DESCRIPTION("Device Mirror/redirect actions");
|
|
MODULE_LICENSE("GPL");
|
|
|
|
static int __init mirred_init_module(void)
|
|
{
|
|
int err = register_netdevice_notifier(&mirred_device_notifier);
|
|
if (err)
|
|
return err;
|
|
|
|
pr_info("Mirror/redirect action on\n");
|
|
err = tcf_register_action(&act_mirred_ops, &mirred_net_ops);
|
|
if (err)
|
|
unregister_netdevice_notifier(&mirred_device_notifier);
|
|
|
|
return err;
|
|
}
|
|
|
|
static void __exit mirred_cleanup_module(void)
|
|
{
|
|
tcf_unregister_action(&act_mirred_ops, &mirred_net_ops);
|
|
unregister_netdevice_notifier(&mirred_device_notifier);
|
|
}
|
|
|
|
module_init(mirred_init_module);
|
|
module_exit(mirred_cleanup_module);
|