![Davide Caratti](/assets/img/avatar_default.png)
in the following script
# tc actions add action ife encode allow prio pass index 42
# tc actions replace action ife encode allow tcindex drop index 42
the action control should remain equal to 'pass', if the kernel failed
to replace the TC action. Pospone the assignment of the action control,
to ensure it is not overwritten in the error path of tcf_ife_init().
Fixes: ef6980b6be
("introduce IFE action")
Signed-off-by: Davide Caratti <dcaratti@redhat.com>
Acked-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
894 lines
20 KiB
C
894 lines
20 KiB
C
/*
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* net/sched/ife.c Inter-FE action based on ForCES WG InterFE LFB
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*
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* Refer to:
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* draft-ietf-forces-interfelfb-03
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* and
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* netdev01 paper:
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* "Distributing Linux Traffic Control Classifier-Action
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* Subsystem"
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* Authors: Jamal Hadi Salim and Damascene M. Joachimpillai
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* copyright Jamal Hadi Salim (2015)
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*
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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 <net/net_namespace.h>
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#include <net/netlink.h>
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#include <net/pkt_sched.h>
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#include <uapi/linux/tc_act/tc_ife.h>
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#include <net/tc_act/tc_ife.h>
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#include <linux/etherdevice.h>
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#include <net/ife.h>
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static unsigned int ife_net_id;
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static int max_metacnt = IFE_META_MAX + 1;
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static struct tc_action_ops act_ife_ops;
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static const struct nla_policy ife_policy[TCA_IFE_MAX + 1] = {
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[TCA_IFE_PARMS] = { .len = sizeof(struct tc_ife)},
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[TCA_IFE_DMAC] = { .len = ETH_ALEN},
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[TCA_IFE_SMAC] = { .len = ETH_ALEN},
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[TCA_IFE_TYPE] = { .type = NLA_U16},
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};
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int ife_encode_meta_u16(u16 metaval, void *skbdata, struct tcf_meta_info *mi)
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{
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u16 edata = 0;
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if (mi->metaval)
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edata = *(u16 *)mi->metaval;
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else if (metaval)
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edata = metaval;
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if (!edata) /* will not encode */
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return 0;
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edata = htons(edata);
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return ife_tlv_meta_encode(skbdata, mi->metaid, 2, &edata);
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}
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EXPORT_SYMBOL_GPL(ife_encode_meta_u16);
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int ife_get_meta_u32(struct sk_buff *skb, struct tcf_meta_info *mi)
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{
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if (mi->metaval)
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return nla_put_u32(skb, mi->metaid, *(u32 *)mi->metaval);
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else
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return nla_put(skb, mi->metaid, 0, NULL);
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}
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EXPORT_SYMBOL_GPL(ife_get_meta_u32);
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int ife_check_meta_u32(u32 metaval, struct tcf_meta_info *mi)
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{
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if (metaval || mi->metaval)
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return 8; /* T+L+V == 2+2+4 */
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return 0;
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}
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EXPORT_SYMBOL_GPL(ife_check_meta_u32);
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int ife_check_meta_u16(u16 metaval, struct tcf_meta_info *mi)
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{
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if (metaval || mi->metaval)
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return 8; /* T+L+(V) == 2+2+(2+2bytepad) */
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return 0;
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}
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EXPORT_SYMBOL_GPL(ife_check_meta_u16);
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int ife_encode_meta_u32(u32 metaval, void *skbdata, struct tcf_meta_info *mi)
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{
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u32 edata = metaval;
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if (mi->metaval)
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edata = *(u32 *)mi->metaval;
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else if (metaval)
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edata = metaval;
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if (!edata) /* will not encode */
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return 0;
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edata = htonl(edata);
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return ife_tlv_meta_encode(skbdata, mi->metaid, 4, &edata);
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}
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EXPORT_SYMBOL_GPL(ife_encode_meta_u32);
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int ife_get_meta_u16(struct sk_buff *skb, struct tcf_meta_info *mi)
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{
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if (mi->metaval)
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return nla_put_u16(skb, mi->metaid, *(u16 *)mi->metaval);
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else
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return nla_put(skb, mi->metaid, 0, NULL);
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}
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EXPORT_SYMBOL_GPL(ife_get_meta_u16);
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int ife_alloc_meta_u32(struct tcf_meta_info *mi, void *metaval, gfp_t gfp)
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{
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mi->metaval = kmemdup(metaval, sizeof(u32), gfp);
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if (!mi->metaval)
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return -ENOMEM;
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return 0;
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}
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EXPORT_SYMBOL_GPL(ife_alloc_meta_u32);
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int ife_alloc_meta_u16(struct tcf_meta_info *mi, void *metaval, gfp_t gfp)
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{
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mi->metaval = kmemdup(metaval, sizeof(u16), gfp);
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if (!mi->metaval)
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return -ENOMEM;
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return 0;
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}
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EXPORT_SYMBOL_GPL(ife_alloc_meta_u16);
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void ife_release_meta_gen(struct tcf_meta_info *mi)
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{
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kfree(mi->metaval);
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}
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EXPORT_SYMBOL_GPL(ife_release_meta_gen);
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int ife_validate_meta_u32(void *val, int len)
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{
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if (len == sizeof(u32))
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return 0;
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return -EINVAL;
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}
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EXPORT_SYMBOL_GPL(ife_validate_meta_u32);
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int ife_validate_meta_u16(void *val, int len)
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{
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/* length will not include padding */
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if (len == sizeof(u16))
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return 0;
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return -EINVAL;
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}
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EXPORT_SYMBOL_GPL(ife_validate_meta_u16);
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static LIST_HEAD(ifeoplist);
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static DEFINE_RWLOCK(ife_mod_lock);
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static struct tcf_meta_ops *find_ife_oplist(u16 metaid)
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{
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struct tcf_meta_ops *o;
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read_lock(&ife_mod_lock);
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list_for_each_entry(o, &ifeoplist, list) {
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if (o->metaid == metaid) {
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if (!try_module_get(o->owner))
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o = NULL;
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read_unlock(&ife_mod_lock);
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return o;
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}
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}
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read_unlock(&ife_mod_lock);
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return NULL;
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}
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int register_ife_op(struct tcf_meta_ops *mops)
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{
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struct tcf_meta_ops *m;
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if (!mops->metaid || !mops->metatype || !mops->name ||
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!mops->check_presence || !mops->encode || !mops->decode ||
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!mops->get || !mops->alloc)
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return -EINVAL;
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write_lock(&ife_mod_lock);
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list_for_each_entry(m, &ifeoplist, list) {
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if (m->metaid == mops->metaid ||
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(strcmp(mops->name, m->name) == 0)) {
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write_unlock(&ife_mod_lock);
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return -EEXIST;
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}
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}
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if (!mops->release)
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mops->release = ife_release_meta_gen;
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list_add_tail(&mops->list, &ifeoplist);
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write_unlock(&ife_mod_lock);
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return 0;
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}
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EXPORT_SYMBOL_GPL(unregister_ife_op);
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int unregister_ife_op(struct tcf_meta_ops *mops)
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{
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struct tcf_meta_ops *m;
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int err = -ENOENT;
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write_lock(&ife_mod_lock);
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list_for_each_entry(m, &ifeoplist, list) {
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if (m->metaid == mops->metaid) {
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list_del(&mops->list);
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err = 0;
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break;
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}
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}
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write_unlock(&ife_mod_lock);
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return err;
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}
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EXPORT_SYMBOL_GPL(register_ife_op);
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static int ife_validate_metatype(struct tcf_meta_ops *ops, void *val, int len)
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{
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int ret = 0;
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/* XXX: unfortunately cant use nla_policy at this point
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* because a length of 0 is valid in the case of
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* "allow". "use" semantics do enforce for proper
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* length and i couldve use nla_policy but it makes it hard
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* to use it just for that..
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*/
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if (ops->validate)
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return ops->validate(val, len);
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if (ops->metatype == NLA_U32)
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ret = ife_validate_meta_u32(val, len);
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else if (ops->metatype == NLA_U16)
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ret = ife_validate_meta_u16(val, len);
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return ret;
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}
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#ifdef CONFIG_MODULES
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static const char *ife_meta_id2name(u32 metaid)
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{
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switch (metaid) {
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case IFE_META_SKBMARK:
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return "skbmark";
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case IFE_META_PRIO:
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return "skbprio";
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case IFE_META_TCINDEX:
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return "tcindex";
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default:
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return "unknown";
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}
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}
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#endif
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/* called when adding new meta information
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* under ife->tcf_lock for existing action
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*/
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static int load_metaops_and_vet(struct tcf_ife_info *ife, u32 metaid,
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void *val, int len, bool exists)
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{
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struct tcf_meta_ops *ops = find_ife_oplist(metaid);
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int ret = 0;
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if (!ops) {
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ret = -ENOENT;
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#ifdef CONFIG_MODULES
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if (exists)
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spin_unlock_bh(&ife->tcf_lock);
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rtnl_unlock();
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request_module("ife-meta-%s", ife_meta_id2name(metaid));
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rtnl_lock();
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if (exists)
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spin_lock_bh(&ife->tcf_lock);
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ops = find_ife_oplist(metaid);
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#endif
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}
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if (ops) {
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ret = 0;
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if (len)
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ret = ife_validate_metatype(ops, val, len);
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module_put(ops->owner);
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}
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return ret;
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}
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/* called when adding new meta information
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* under ife->tcf_lock for existing action
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*/
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static int add_metainfo(struct tcf_ife_info *ife, u32 metaid, void *metaval,
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int len, bool atomic)
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{
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struct tcf_meta_info *mi = NULL;
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struct tcf_meta_ops *ops = find_ife_oplist(metaid);
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int ret = 0;
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if (!ops)
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return -ENOENT;
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mi = kzalloc(sizeof(*mi), atomic ? GFP_ATOMIC : GFP_KERNEL);
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if (!mi) {
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/*put back what find_ife_oplist took */
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module_put(ops->owner);
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return -ENOMEM;
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}
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mi->metaid = metaid;
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mi->ops = ops;
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if (len > 0) {
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ret = ops->alloc(mi, metaval, atomic ? GFP_ATOMIC : GFP_KERNEL);
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if (ret != 0) {
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kfree(mi);
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module_put(ops->owner);
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return ret;
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}
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}
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list_add_tail(&mi->metalist, &ife->metalist);
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return ret;
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}
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static int use_all_metadata(struct tcf_ife_info *ife)
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{
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struct tcf_meta_ops *o;
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int rc = 0;
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int installed = 0;
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read_lock(&ife_mod_lock);
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list_for_each_entry(o, &ifeoplist, list) {
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rc = add_metainfo(ife, o->metaid, NULL, 0, true);
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if (rc == 0)
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installed += 1;
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}
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read_unlock(&ife_mod_lock);
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if (installed)
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return 0;
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else
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return -EINVAL;
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}
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static int dump_metalist(struct sk_buff *skb, struct tcf_ife_info *ife)
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{
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struct tcf_meta_info *e;
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struct nlattr *nest;
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unsigned char *b = skb_tail_pointer(skb);
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int total_encoded = 0;
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/*can only happen on decode */
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if (list_empty(&ife->metalist))
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return 0;
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nest = nla_nest_start(skb, TCA_IFE_METALST);
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if (!nest)
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goto out_nlmsg_trim;
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list_for_each_entry(e, &ife->metalist, metalist) {
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if (!e->ops->get(skb, e))
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total_encoded += 1;
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}
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if (!total_encoded)
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goto out_nlmsg_trim;
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nla_nest_end(skb, nest);
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return 0;
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out_nlmsg_trim:
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nlmsg_trim(skb, b);
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return -1;
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}
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/* under ife->tcf_lock */
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static void _tcf_ife_cleanup(struct tc_action *a)
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{
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struct tcf_ife_info *ife = to_ife(a);
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struct tcf_meta_info *e, *n;
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list_for_each_entry_safe(e, n, &ife->metalist, metalist) {
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module_put(e->ops->owner);
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list_del(&e->metalist);
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if (e->metaval) {
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if (e->ops->release)
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e->ops->release(e);
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else
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kfree(e->metaval);
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}
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kfree(e);
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}
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}
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static void tcf_ife_cleanup(struct tc_action *a)
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{
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struct tcf_ife_info *ife = to_ife(a);
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struct tcf_ife_params *p;
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spin_lock_bh(&ife->tcf_lock);
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_tcf_ife_cleanup(a);
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spin_unlock_bh(&ife->tcf_lock);
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p = rcu_dereference_protected(ife->params, 1);
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if (p)
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kfree_rcu(p, rcu);
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}
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/* under ife->tcf_lock for existing action */
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static int populate_metalist(struct tcf_ife_info *ife, struct nlattr **tb,
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bool exists)
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{
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int len = 0;
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int rc = 0;
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int i = 0;
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void *val;
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for (i = 1; i < max_metacnt; i++) {
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if (tb[i]) {
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val = nla_data(tb[i]);
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len = nla_len(tb[i]);
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rc = load_metaops_and_vet(ife, i, val, len, exists);
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if (rc != 0)
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return rc;
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rc = add_metainfo(ife, i, val, len, exists);
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if (rc)
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return rc;
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}
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}
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return rc;
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}
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static int tcf_ife_init(struct net *net, struct nlattr *nla,
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struct nlattr *est, struct tc_action **a,
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int ovr, int bind, struct netlink_ext_ack *extack)
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{
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struct tc_action_net *tn = net_generic(net, ife_net_id);
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struct nlattr *tb[TCA_IFE_MAX + 1];
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struct nlattr *tb2[IFE_META_MAX + 1];
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struct tcf_ife_params *p, *p_old;
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struct tcf_ife_info *ife;
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u16 ife_type = ETH_P_IFE;
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struct tc_ife *parm;
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u8 *daddr = NULL;
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u8 *saddr = NULL;
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bool exists = false;
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int ret = 0;
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int err;
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err = nla_parse_nested(tb, TCA_IFE_MAX, nla, ife_policy, NULL);
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if (err < 0)
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return err;
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if (!tb[TCA_IFE_PARMS])
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return -EINVAL;
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parm = nla_data(tb[TCA_IFE_PARMS]);
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/* IFE_DECODE is 0 and indicates the opposite of IFE_ENCODE because
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* they cannot run as the same time. Check on all other values which
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* are not supported right now.
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*/
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if (parm->flags & ~IFE_ENCODE)
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return -EINVAL;
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p = kzalloc(sizeof(*p), GFP_KERNEL);
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if (!p)
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return -ENOMEM;
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exists = tcf_idr_check(tn, parm->index, a, bind);
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if (exists && bind) {
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kfree(p);
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return 0;
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}
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if (!exists) {
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ret = tcf_idr_create(tn, parm->index, est, a, &act_ife_ops,
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bind, true);
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if (ret) {
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kfree(p);
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return ret;
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}
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ret = ACT_P_CREATED;
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} else {
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tcf_idr_release(*a, bind);
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if (!ovr) {
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kfree(p);
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return -EEXIST;
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}
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}
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ife = to_ife(*a);
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p->flags = parm->flags;
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if (parm->flags & IFE_ENCODE) {
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if (tb[TCA_IFE_TYPE])
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ife_type = nla_get_u16(tb[TCA_IFE_TYPE]);
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if (tb[TCA_IFE_DMAC])
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daddr = nla_data(tb[TCA_IFE_DMAC]);
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if (tb[TCA_IFE_SMAC])
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saddr = nla_data(tb[TCA_IFE_SMAC]);
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}
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if (parm->flags & IFE_ENCODE) {
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|
if (daddr)
|
|
ether_addr_copy(p->eth_dst, daddr);
|
|
else
|
|
eth_zero_addr(p->eth_dst);
|
|
|
|
if (saddr)
|
|
ether_addr_copy(p->eth_src, saddr);
|
|
else
|
|
eth_zero_addr(p->eth_src);
|
|
|
|
p->eth_type = ife_type;
|
|
}
|
|
|
|
if (exists)
|
|
spin_lock_bh(&ife->tcf_lock);
|
|
|
|
if (ret == ACT_P_CREATED)
|
|
INIT_LIST_HEAD(&ife->metalist);
|
|
|
|
if (tb[TCA_IFE_METALST]) {
|
|
err = nla_parse_nested(tb2, IFE_META_MAX, tb[TCA_IFE_METALST],
|
|
NULL, NULL);
|
|
if (err) {
|
|
metadata_parse_err:
|
|
if (ret == ACT_P_CREATED)
|
|
tcf_idr_release(*a, bind);
|
|
|
|
if (exists)
|
|
spin_unlock_bh(&ife->tcf_lock);
|
|
kfree(p);
|
|
return err;
|
|
}
|
|
|
|
err = populate_metalist(ife, tb2, exists);
|
|
if (err)
|
|
goto metadata_parse_err;
|
|
|
|
} else {
|
|
/* if no passed metadata allow list or passed allow-all
|
|
* then here we process by adding as many supported metadatum
|
|
* as we can. You better have at least one else we are
|
|
* going to bail out
|
|
*/
|
|
err = use_all_metadata(ife);
|
|
if (err) {
|
|
if (ret == ACT_P_CREATED)
|
|
tcf_idr_release(*a, bind);
|
|
|
|
if (exists)
|
|
spin_unlock_bh(&ife->tcf_lock);
|
|
kfree(p);
|
|
return err;
|
|
}
|
|
}
|
|
|
|
ife->tcf_action = parm->action;
|
|
if (exists)
|
|
spin_unlock_bh(&ife->tcf_lock);
|
|
|
|
p_old = rtnl_dereference(ife->params);
|
|
rcu_assign_pointer(ife->params, p);
|
|
if (p_old)
|
|
kfree_rcu(p_old, rcu);
|
|
|
|
if (ret == ACT_P_CREATED)
|
|
tcf_idr_insert(tn, *a);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int tcf_ife_dump(struct sk_buff *skb, struct tc_action *a, int bind,
|
|
int ref)
|
|
{
|
|
unsigned char *b = skb_tail_pointer(skb);
|
|
struct tcf_ife_info *ife = to_ife(a);
|
|
struct tcf_ife_params *p = rtnl_dereference(ife->params);
|
|
struct tc_ife opt = {
|
|
.index = ife->tcf_index,
|
|
.refcnt = ife->tcf_refcnt - ref,
|
|
.bindcnt = ife->tcf_bindcnt - bind,
|
|
.action = ife->tcf_action,
|
|
.flags = p->flags,
|
|
};
|
|
struct tcf_t t;
|
|
|
|
if (nla_put(skb, TCA_IFE_PARMS, sizeof(opt), &opt))
|
|
goto nla_put_failure;
|
|
|
|
tcf_tm_dump(&t, &ife->tcf_tm);
|
|
if (nla_put_64bit(skb, TCA_IFE_TM, sizeof(t), &t, TCA_IFE_PAD))
|
|
goto nla_put_failure;
|
|
|
|
if (!is_zero_ether_addr(p->eth_dst)) {
|
|
if (nla_put(skb, TCA_IFE_DMAC, ETH_ALEN, p->eth_dst))
|
|
goto nla_put_failure;
|
|
}
|
|
|
|
if (!is_zero_ether_addr(p->eth_src)) {
|
|
if (nla_put(skb, TCA_IFE_SMAC, ETH_ALEN, p->eth_src))
|
|
goto nla_put_failure;
|
|
}
|
|
|
|
if (nla_put(skb, TCA_IFE_TYPE, 2, &p->eth_type))
|
|
goto nla_put_failure;
|
|
|
|
if (dump_metalist(skb, ife)) {
|
|
/*ignore failure to dump metalist */
|
|
pr_info("Failed to dump metalist\n");
|
|
}
|
|
|
|
return skb->len;
|
|
|
|
nla_put_failure:
|
|
nlmsg_trim(skb, b);
|
|
return -1;
|
|
}
|
|
|
|
static int find_decode_metaid(struct sk_buff *skb, struct tcf_ife_info *ife,
|
|
u16 metaid, u16 mlen, void *mdata)
|
|
{
|
|
struct tcf_meta_info *e;
|
|
|
|
/* XXX: use hash to speed up */
|
|
list_for_each_entry(e, &ife->metalist, metalist) {
|
|
if (metaid == e->metaid) {
|
|
if (e->ops) {
|
|
/* We check for decode presence already */
|
|
return e->ops->decode(skb, mdata, mlen);
|
|
}
|
|
}
|
|
}
|
|
|
|
return -ENOENT;
|
|
}
|
|
|
|
static int tcf_ife_decode(struct sk_buff *skb, const struct tc_action *a,
|
|
struct tcf_result *res)
|
|
{
|
|
struct tcf_ife_info *ife = to_ife(a);
|
|
int action = ife->tcf_action;
|
|
u8 *ifehdr_end;
|
|
u8 *tlv_data;
|
|
u16 metalen;
|
|
|
|
bstats_cpu_update(this_cpu_ptr(ife->common.cpu_bstats), skb);
|
|
tcf_lastuse_update(&ife->tcf_tm);
|
|
|
|
if (skb_at_tc_ingress(skb))
|
|
skb_push(skb, skb->dev->hard_header_len);
|
|
|
|
tlv_data = ife_decode(skb, &metalen);
|
|
if (unlikely(!tlv_data)) {
|
|
qstats_drop_inc(this_cpu_ptr(ife->common.cpu_qstats));
|
|
return TC_ACT_SHOT;
|
|
}
|
|
|
|
ifehdr_end = tlv_data + metalen;
|
|
for (; tlv_data < ifehdr_end; tlv_data = ife_tlv_meta_next(tlv_data)) {
|
|
u8 *curr_data;
|
|
u16 mtype;
|
|
u16 dlen;
|
|
|
|
curr_data = ife_tlv_meta_decode(tlv_data, ifehdr_end, &mtype,
|
|
&dlen, NULL);
|
|
if (!curr_data) {
|
|
qstats_drop_inc(this_cpu_ptr(ife->common.cpu_qstats));
|
|
return TC_ACT_SHOT;
|
|
}
|
|
|
|
if (find_decode_metaid(skb, ife, mtype, dlen, curr_data)) {
|
|
/* abuse overlimits to count when we receive metadata
|
|
* but dont have an ops for it
|
|
*/
|
|
pr_info_ratelimited("Unknown metaid %d dlen %d\n",
|
|
mtype, dlen);
|
|
qstats_overlimit_inc(this_cpu_ptr(ife->common.cpu_qstats));
|
|
}
|
|
}
|
|
|
|
if (WARN_ON(tlv_data != ifehdr_end)) {
|
|
qstats_drop_inc(this_cpu_ptr(ife->common.cpu_qstats));
|
|
return TC_ACT_SHOT;
|
|
}
|
|
|
|
skb->protocol = eth_type_trans(skb, skb->dev);
|
|
skb_reset_network_header(skb);
|
|
|
|
return action;
|
|
}
|
|
|
|
/*XXX: check if we can do this at install time instead of current
|
|
* send data path
|
|
**/
|
|
static int ife_get_sz(struct sk_buff *skb, struct tcf_ife_info *ife)
|
|
{
|
|
struct tcf_meta_info *e, *n;
|
|
int tot_run_sz = 0, run_sz = 0;
|
|
|
|
list_for_each_entry_safe(e, n, &ife->metalist, metalist) {
|
|
if (e->ops->check_presence) {
|
|
run_sz = e->ops->check_presence(skb, e);
|
|
tot_run_sz += run_sz;
|
|
}
|
|
}
|
|
|
|
return tot_run_sz;
|
|
}
|
|
|
|
static int tcf_ife_encode(struct sk_buff *skb, const struct tc_action *a,
|
|
struct tcf_result *res, struct tcf_ife_params *p)
|
|
{
|
|
struct tcf_ife_info *ife = to_ife(a);
|
|
int action = ife->tcf_action;
|
|
struct ethhdr *oethh; /* outer ether header */
|
|
struct tcf_meta_info *e;
|
|
/*
|
|
OUTERHDR:TOTMETALEN:{TLVHDR:Metadatum:TLVHDR..}:ORIGDATA
|
|
where ORIGDATA = original ethernet header ...
|
|
*/
|
|
u16 metalen = ife_get_sz(skb, ife);
|
|
int hdrm = metalen + skb->dev->hard_header_len + IFE_METAHDRLEN;
|
|
unsigned int skboff = 0;
|
|
int new_len = skb->len + hdrm;
|
|
bool exceed_mtu = false;
|
|
void *ife_meta;
|
|
int err = 0;
|
|
|
|
if (!skb_at_tc_ingress(skb)) {
|
|
if (new_len > skb->dev->mtu)
|
|
exceed_mtu = true;
|
|
}
|
|
|
|
bstats_cpu_update(this_cpu_ptr(ife->common.cpu_bstats), skb);
|
|
tcf_lastuse_update(&ife->tcf_tm);
|
|
|
|
if (!metalen) { /* no metadata to send */
|
|
/* abuse overlimits to count when we allow packet
|
|
* with no metadata
|
|
*/
|
|
qstats_overlimit_inc(this_cpu_ptr(ife->common.cpu_qstats));
|
|
return action;
|
|
}
|
|
/* could be stupid policy setup or mtu config
|
|
* so lets be conservative.. */
|
|
if ((action == TC_ACT_SHOT) || exceed_mtu) {
|
|
qstats_drop_inc(this_cpu_ptr(ife->common.cpu_qstats));
|
|
return TC_ACT_SHOT;
|
|
}
|
|
|
|
if (skb_at_tc_ingress(skb))
|
|
skb_push(skb, skb->dev->hard_header_len);
|
|
|
|
ife_meta = ife_encode(skb, metalen);
|
|
|
|
spin_lock(&ife->tcf_lock);
|
|
|
|
/* XXX: we dont have a clever way of telling encode to
|
|
* not repeat some of the computations that are done by
|
|
* ops->presence_check...
|
|
*/
|
|
list_for_each_entry(e, &ife->metalist, metalist) {
|
|
if (e->ops->encode) {
|
|
err = e->ops->encode(skb, (void *)(ife_meta + skboff),
|
|
e);
|
|
}
|
|
if (err < 0) {
|
|
/* too corrupt to keep around if overwritten */
|
|
spin_unlock(&ife->tcf_lock);
|
|
qstats_drop_inc(this_cpu_ptr(ife->common.cpu_qstats));
|
|
return TC_ACT_SHOT;
|
|
}
|
|
skboff += err;
|
|
}
|
|
spin_unlock(&ife->tcf_lock);
|
|
oethh = (struct ethhdr *)skb->data;
|
|
|
|
if (!is_zero_ether_addr(p->eth_src))
|
|
ether_addr_copy(oethh->h_source, p->eth_src);
|
|
if (!is_zero_ether_addr(p->eth_dst))
|
|
ether_addr_copy(oethh->h_dest, p->eth_dst);
|
|
oethh->h_proto = htons(p->eth_type);
|
|
|
|
if (skb_at_tc_ingress(skb))
|
|
skb_pull(skb, skb->dev->hard_header_len);
|
|
|
|
return action;
|
|
}
|
|
|
|
static int tcf_ife_act(struct sk_buff *skb, const struct tc_action *a,
|
|
struct tcf_result *res)
|
|
{
|
|
struct tcf_ife_info *ife = to_ife(a);
|
|
struct tcf_ife_params *p;
|
|
int ret;
|
|
|
|
rcu_read_lock();
|
|
p = rcu_dereference(ife->params);
|
|
if (p->flags & IFE_ENCODE) {
|
|
ret = tcf_ife_encode(skb, a, res, p);
|
|
rcu_read_unlock();
|
|
return ret;
|
|
}
|
|
rcu_read_unlock();
|
|
|
|
return tcf_ife_decode(skb, a, res);
|
|
}
|
|
|
|
static int tcf_ife_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, ife_net_id);
|
|
|
|
return tcf_generic_walker(tn, skb, cb, type, ops, extack);
|
|
}
|
|
|
|
static int tcf_ife_search(struct net *net, struct tc_action **a, u32 index,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
struct tc_action_net *tn = net_generic(net, ife_net_id);
|
|
|
|
return tcf_idr_search(tn, a, index);
|
|
}
|
|
|
|
static struct tc_action_ops act_ife_ops = {
|
|
.kind = "ife",
|
|
.type = TCA_ACT_IFE,
|
|
.owner = THIS_MODULE,
|
|
.act = tcf_ife_act,
|
|
.dump = tcf_ife_dump,
|
|
.cleanup = tcf_ife_cleanup,
|
|
.init = tcf_ife_init,
|
|
.walk = tcf_ife_walker,
|
|
.lookup = tcf_ife_search,
|
|
.size = sizeof(struct tcf_ife_info),
|
|
};
|
|
|
|
static __net_init int ife_init_net(struct net *net)
|
|
{
|
|
struct tc_action_net *tn = net_generic(net, ife_net_id);
|
|
|
|
return tc_action_net_init(tn, &act_ife_ops);
|
|
}
|
|
|
|
static void __net_exit ife_exit_net(struct list_head *net_list)
|
|
{
|
|
tc_action_net_exit(net_list, ife_net_id);
|
|
}
|
|
|
|
static struct pernet_operations ife_net_ops = {
|
|
.init = ife_init_net,
|
|
.exit_batch = ife_exit_net,
|
|
.id = &ife_net_id,
|
|
.size = sizeof(struct tc_action_net),
|
|
};
|
|
|
|
static int __init ife_init_module(void)
|
|
{
|
|
return tcf_register_action(&act_ife_ops, &ife_net_ops);
|
|
}
|
|
|
|
static void __exit ife_cleanup_module(void)
|
|
{
|
|
tcf_unregister_action(&act_ife_ops, &ife_net_ops);
|
|
}
|
|
|
|
module_init(ife_init_module);
|
|
module_exit(ife_cleanup_module);
|
|
|
|
MODULE_AUTHOR("Jamal Hadi Salim(2015)");
|
|
MODULE_DESCRIPTION("Inter-FE LFB action");
|
|
MODULE_LICENSE("GPL");
|