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871cf386dd
Expose the necessary tc act functions and wire up act_api to use direct calls in retpoline kernels. Signed-off-by: Pedro Tammela <pctammela@mojatatu.com> Reviewed-by: Jamal Hadi Salim <jhs@mojatatu.com> Reviewed-by: Victor Nogueira <victor@mojatatu.com> Signed-off-by: David S. Miller <davem@davemloft.net>
927 lines
20 KiB
C
927 lines
20 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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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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* copyright Jamal Hadi Salim (2015)
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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 <net/pkt_cls.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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#include <net/tc_wrapper.h>
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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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*/
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static int load_metaops_and_vet(u32 metaid, void *val, int len, bool rtnl_held)
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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 (rtnl_held)
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rtnl_unlock();
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request_module("ife-meta-%s", ife_meta_id2name(metaid));
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if (rtnl_held)
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rtnl_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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*/
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static int __add_metainfo(const struct tcf_meta_ops *ops,
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struct tcf_ife_info *ife, u32 metaid, void *metaval,
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int len, bool atomic, bool exists)
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{
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struct tcf_meta_info *mi = NULL;
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int ret = 0;
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mi = kzalloc(sizeof(*mi), atomic ? GFP_ATOMIC : GFP_KERNEL);
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if (!mi)
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return -ENOMEM;
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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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return ret;
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}
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}
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if (exists)
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spin_lock_bh(&ife->tcf_lock);
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list_add_tail(&mi->metalist, &ife->metalist);
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if (exists)
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spin_unlock_bh(&ife->tcf_lock);
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return ret;
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}
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static int add_metainfo_and_get_ops(const struct tcf_meta_ops *ops,
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struct tcf_ife_info *ife, u32 metaid,
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bool exists)
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{
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int ret;
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if (!try_module_get(ops->owner))
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return -ENOENT;
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ret = __add_metainfo(ops, ife, metaid, NULL, 0, true, exists);
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if (ret)
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module_put(ops->owner);
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return ret;
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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 exists)
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{
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const struct tcf_meta_ops *ops = find_ife_oplist(metaid);
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int ret;
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if (!ops)
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return -ENOENT;
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ret = __add_metainfo(ops, ife, metaid, metaval, len, false, exists);
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if (ret)
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/*put back what find_ife_oplist took */
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module_put(ops->owner);
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return ret;
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}
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static int use_all_metadata(struct tcf_ife_info *ife, bool exists)
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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_and_get_ops(o, ife, o->metaid, exists);
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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_noflag(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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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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module_put(e->ops->owner);
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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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static int load_metalist(struct nlattr **tb, bool rtnl_held)
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{
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int i;
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for (i = 1; i < max_metacnt; i++) {
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if (tb[i]) {
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void *val = nla_data(tb[i]);
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int len = nla_len(tb[i]);
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int rc;
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rc = load_metaops_and_vet(i, val, len, rtnl_held);
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if (rc != 0)
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return rc;
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}
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}
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return 0;
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}
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static int populate_metalist(struct tcf_ife_info *ife, struct nlattr **tb,
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bool exists, bool rtnl_held)
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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 = 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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struct tcf_proto *tp, u32 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_ife_ops.net_id);
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bool bind = flags & TCA_ACT_FLAGS_BIND;
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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_chain *goto_ch = NULL;
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struct tcf_ife_params *p;
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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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u32 index;
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int err;
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if (!nla) {
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NL_SET_ERR_MSG_MOD(extack, "IFE requires attributes to be passed");
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return -EINVAL;
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}
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err = nla_parse_nested_deprecated(tb, TCA_IFE_MAX, nla, ife_policy,
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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);
|
|
if (!p)
|
|
return -ENOMEM;
|
|
|
|
if (tb[TCA_IFE_METALST]) {
|
|
err = nla_parse_nested_deprecated(tb2, IFE_META_MAX,
|
|
tb[TCA_IFE_METALST], NULL,
|
|
NULL);
|
|
if (err) {
|
|
kfree(p);
|
|
return err;
|
|
}
|
|
err = load_metalist(tb2, !(flags & TCA_ACT_FLAGS_NO_RTNL));
|
|
if (err) {
|
|
kfree(p);
|
|
return err;
|
|
}
|
|
}
|
|
|
|
index = parm->index;
|
|
err = tcf_idr_check_alloc(tn, &index, a, bind);
|
|
if (err < 0) {
|
|
kfree(p);
|
|
return err;
|
|
}
|
|
exists = err;
|
|
if (exists && bind) {
|
|
kfree(p);
|
|
return 0;
|
|
}
|
|
|
|
if (!exists) {
|
|
ret = tcf_idr_create(tn, index, est, a, &act_ife_ops,
|
|
bind, true, flags);
|
|
if (ret) {
|
|
tcf_idr_cleanup(tn, index);
|
|
kfree(p);
|
|
return ret;
|
|
}
|
|
ret = ACT_P_CREATED;
|
|
} else if (!(flags & TCA_ACT_FLAGS_REPLACE)) {
|
|
tcf_idr_release(*a, bind);
|
|
kfree(p);
|
|
return -EEXIST;
|
|
}
|
|
|
|
ife = to_ife(*a);
|
|
if (ret == ACT_P_CREATED)
|
|
INIT_LIST_HEAD(&ife->metalist);
|
|
|
|
err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, extack);
|
|
if (err < 0)
|
|
goto release_idr;
|
|
|
|
p->flags = parm->flags;
|
|
|
|
if (parm->flags & IFE_ENCODE) {
|
|
if (tb[TCA_IFE_TYPE])
|
|
ife_type = nla_get_u16(tb[TCA_IFE_TYPE]);
|
|
if (tb[TCA_IFE_DMAC])
|
|
daddr = nla_data(tb[TCA_IFE_DMAC]);
|
|
if (tb[TCA_IFE_SMAC])
|
|
saddr = nla_data(tb[TCA_IFE_SMAC]);
|
|
}
|
|
|
|
if (parm->flags & IFE_ENCODE) {
|
|
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 (tb[TCA_IFE_METALST]) {
|
|
err = populate_metalist(ife, tb2, exists,
|
|
!(flags & TCA_ACT_FLAGS_NO_RTNL));
|
|
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, exists);
|
|
if (err)
|
|
goto metadata_parse_err;
|
|
}
|
|
|
|
if (exists)
|
|
spin_lock_bh(&ife->tcf_lock);
|
|
/* protected by tcf_lock when modifying existing action */
|
|
goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch);
|
|
p = rcu_replace_pointer(ife->params, p, 1);
|
|
|
|
if (exists)
|
|
spin_unlock_bh(&ife->tcf_lock);
|
|
if (goto_ch)
|
|
tcf_chain_put_by_act(goto_ch);
|
|
if (p)
|
|
kfree_rcu(p, rcu);
|
|
|
|
return ret;
|
|
metadata_parse_err:
|
|
if (goto_ch)
|
|
tcf_chain_put_by_act(goto_ch);
|
|
release_idr:
|
|
kfree(p);
|
|
tcf_idr_release(*a, bind);
|
|
return err;
|
|
}
|
|
|
|
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;
|
|
struct tc_ife opt = {
|
|
.index = ife->tcf_index,
|
|
.refcnt = refcount_read(&ife->tcf_refcnt) - ref,
|
|
.bindcnt = atomic_read(&ife->tcf_bindcnt) - bind,
|
|
};
|
|
struct tcf_t t;
|
|
|
|
spin_lock_bh(&ife->tcf_lock);
|
|
opt.action = ife->tcf_action;
|
|
p = rcu_dereference_protected(ife->params,
|
|
lockdep_is_held(&ife->tcf_lock));
|
|
opt.flags = p->flags;
|
|
|
|
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");
|
|
}
|
|
|
|
spin_unlock_bh(&ife->tcf_lock);
|
|
return skb->len;
|
|
|
|
nla_put_failure:
|
|
spin_unlock_bh(&ife->tcf_lock);
|
|
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_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_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;
|
|
}
|
|
|
|
TC_INDIRECT_SCOPE 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;
|
|
|
|
p = rcu_dereference_bh(ife->params);
|
|
if (p->flags & IFE_ENCODE) {
|
|
ret = tcf_ife_encode(skb, a, res, p);
|
|
return ret;
|
|
}
|
|
|
|
return tcf_ife_decode(skb, a, res);
|
|
}
|
|
|
|
static struct tc_action_ops act_ife_ops = {
|
|
.kind = "ife",
|
|
.id = TCA_ID_IFE,
|
|
.owner = THIS_MODULE,
|
|
.act = tcf_ife_act,
|
|
.dump = tcf_ife_dump,
|
|
.cleanup = tcf_ife_cleanup,
|
|
.init = tcf_ife_init,
|
|
.size = sizeof(struct tcf_ife_info),
|
|
};
|
|
|
|
static __net_init int ife_init_net(struct net *net)
|
|
{
|
|
struct tc_action_net *tn = net_generic(net, act_ife_ops.net_id);
|
|
|
|
return tc_action_net_init(net, tn, &act_ife_ops);
|
|
}
|
|
|
|
static void __net_exit ife_exit_net(struct list_head *net_list)
|
|
{
|
|
tc_action_net_exit(net_list, act_ife_ops.net_id);
|
|
}
|
|
|
|
static struct pernet_operations ife_net_ops = {
|
|
.init = ife_init_net,
|
|
.exit_batch = ife_exit_net,
|
|
.id = &act_ife_ops.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");
|