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-rw-r--r--net/sched/act_ife.c870
1 files changed, 870 insertions, 0 deletions
diff --git a/net/sched/act_ife.c b/net/sched/act_ife.c
new file mode 100644
index 0000000..c589a9b
--- /dev/null
+++ b/net/sched/act_ife.c
@@ -0,0 +1,870 @@
+/*
+ * net/sched/ife.c Inter-FE action based on ForCES WG InterFE LFB
+ *
+ * Refer to:
+ * draft-ietf-forces-interfelfb-03
+ * and
+ * netdev01 paper:
+ * "Distributing Linux Traffic Control Classifier-Action
+ * Subsystem"
+ * Authors: Jamal Hadi Salim and Damascene M. Joachimpillai
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ *
+ * copyright Jamal Hadi Salim (2015)
+ *
+*/
+
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/errno.h>
+#include <linux/skbuff.h>
+#include <linux/rtnetlink.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <net/net_namespace.h>
+#include <net/netlink.h>
+#include <net/pkt_sched.h>
+#include <uapi/linux/tc_act/tc_ife.h>
+#include <net/tc_act/tc_ife.h>
+#include <linux/etherdevice.h>
+
+#define IFE_TAB_MASK 15
+
+static int ife_net_id;
+static int max_metacnt = IFE_META_MAX + 1;
+
+static const struct nla_policy ife_policy[TCA_IFE_MAX + 1] = {
+ [TCA_IFE_PARMS] = { .len = sizeof(struct tc_ife)},
+ [TCA_IFE_DMAC] = { .len = ETH_ALEN},
+ [TCA_IFE_SMAC] = { .len = ETH_ALEN},
+ [TCA_IFE_TYPE] = { .type = NLA_U16},
+};
+
+/* Caller takes care of presenting data in network order
+*/
+int ife_tlv_meta_encode(void *skbdata, u16 attrtype, u16 dlen, const void *dval)
+{
+ u32 *tlv = (u32 *)(skbdata);
+ u16 totlen = nla_total_size(dlen); /*alignment + hdr */
+ char *dptr = (char *)tlv + NLA_HDRLEN;
+ u32 htlv = attrtype << 16 | totlen;
+
+ *tlv = htonl(htlv);
+ memset(dptr, 0, totlen - NLA_HDRLEN);
+ memcpy(dptr, dval, dlen);
+
+ return totlen;
+}
+EXPORT_SYMBOL_GPL(ife_tlv_meta_encode);
+
+int ife_get_meta_u32(struct sk_buff *skb, struct tcf_meta_info *mi)
+{
+ if (mi->metaval)
+ return nla_put_u32(skb, mi->metaid, *(u32 *)mi->metaval);
+ else
+ return nla_put(skb, mi->metaid, 0, NULL);
+}
+EXPORT_SYMBOL_GPL(ife_get_meta_u32);
+
+int ife_check_meta_u32(u32 metaval, struct tcf_meta_info *mi)
+{
+ if (metaval || mi->metaval)
+ return 8; /* T+L+V == 2+2+4 */
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(ife_check_meta_u32);
+
+int ife_encode_meta_u32(u32 metaval, void *skbdata, struct tcf_meta_info *mi)
+{
+ u32 edata = metaval;
+
+ if (mi->metaval)
+ edata = *(u32 *)mi->metaval;
+ else if (metaval)
+ edata = metaval;
+
+ if (!edata) /* will not encode */
+ return 0;
+
+ edata = htonl(edata);
+ return ife_tlv_meta_encode(skbdata, mi->metaid, 4, &edata);
+}
+EXPORT_SYMBOL_GPL(ife_encode_meta_u32);
+
+int ife_get_meta_u16(struct sk_buff *skb, struct tcf_meta_info *mi)
+{
+ if (mi->metaval)
+ return nla_put_u16(skb, mi->metaid, *(u16 *)mi->metaval);
+ else
+ return nla_put(skb, mi->metaid, 0, NULL);
+}
+EXPORT_SYMBOL_GPL(ife_get_meta_u16);
+
+int ife_alloc_meta_u32(struct tcf_meta_info *mi, void *metaval)
+{
+ mi->metaval = kmemdup(metaval, sizeof(u32), GFP_KERNEL);
+ if (!mi->metaval)
+ return -ENOMEM;
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(ife_alloc_meta_u32);
+
+int ife_alloc_meta_u16(struct tcf_meta_info *mi, void *metaval)
+{
+ mi->metaval = kmemdup(metaval, sizeof(u16), GFP_KERNEL);
+ if (!mi->metaval)
+ return -ENOMEM;
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(ife_alloc_meta_u16);
+
+void ife_release_meta_gen(struct tcf_meta_info *mi)
+{
+ kfree(mi->metaval);
+}
+EXPORT_SYMBOL_GPL(ife_release_meta_gen);
+
+int ife_validate_meta_u32(void *val, int len)
+{
+ if (len == 4)
+ return 0;
+
+ return -EINVAL;
+}
+EXPORT_SYMBOL_GPL(ife_validate_meta_u32);
+
+int ife_validate_meta_u16(void *val, int len)
+{
+ /* length will include padding */
+ if (len == NLA_ALIGN(2))
+ return 0;
+
+ return -EINVAL;
+}
+EXPORT_SYMBOL_GPL(ife_validate_meta_u16);
+
+static LIST_HEAD(ifeoplist);
+static DEFINE_RWLOCK(ife_mod_lock);
+
+static struct tcf_meta_ops *find_ife_oplist(u16 metaid)
+{
+ struct tcf_meta_ops *o;
+
+ read_lock(&ife_mod_lock);
+ list_for_each_entry(o, &ifeoplist, list) {
+ if (o->metaid == metaid) {
+ if (!try_module_get(o->owner))
+ o = NULL;
+ read_unlock(&ife_mod_lock);
+ return o;
+ }
+ }
+ read_unlock(&ife_mod_lock);
+
+ return NULL;
+}
+
+int register_ife_op(struct tcf_meta_ops *mops)
+{
+ struct tcf_meta_ops *m;
+
+ if (!mops->metaid || !mops->metatype || !mops->name ||
+ !mops->check_presence || !mops->encode || !mops->decode ||
+ !mops->get || !mops->alloc)
+ return -EINVAL;
+
+ write_lock(&ife_mod_lock);
+
+ list_for_each_entry(m, &ifeoplist, list) {
+ if (m->metaid == mops->metaid ||
+ (strcmp(mops->name, m->name) == 0)) {
+ write_unlock(&ife_mod_lock);
+ return -EEXIST;
+ }
+ }
+
+ if (!mops->release)
+ mops->release = ife_release_meta_gen;
+
+ list_add_tail(&mops->list, &ifeoplist);
+ write_unlock(&ife_mod_lock);
+ return 0;
+}
+EXPORT_SYMBOL_GPL(unregister_ife_op);
+
+int unregister_ife_op(struct tcf_meta_ops *mops)
+{
+ struct tcf_meta_ops *m;
+ int err = -ENOENT;
+
+ write_lock(&ife_mod_lock);
+ list_for_each_entry(m, &ifeoplist, list) {
+ if (m->metaid == mops->metaid) {
+ list_del(&mops->list);
+ err = 0;
+ break;
+ }
+ }
+ write_unlock(&ife_mod_lock);
+
+ return err;
+}
+EXPORT_SYMBOL_GPL(register_ife_op);
+
+static int ife_validate_metatype(struct tcf_meta_ops *ops, void *val, int len)
+{
+ int ret = 0;
+ /* XXX: unfortunately cant use nla_policy at this point
+ * because a length of 0 is valid in the case of
+ * "allow". "use" semantics do enforce for proper
+ * length and i couldve use nla_policy but it makes it hard
+ * to use it just for that..
+ */
+ if (ops->validate)
+ return ops->validate(val, len);
+
+ if (ops->metatype == NLA_U32)
+ ret = ife_validate_meta_u32(val, len);
+ else if (ops->metatype == NLA_U16)
+ ret = ife_validate_meta_u16(val, len);
+
+ return ret;
+}
+
+/* called when adding new meta information
+ * under ife->tcf_lock
+*/
+static int load_metaops_and_vet(struct tcf_ife_info *ife, u32 metaid,
+ void *val, int len)
+{
+ struct tcf_meta_ops *ops = find_ife_oplist(metaid);
+ int ret = 0;
+
+ if (!ops) {
+ ret = -ENOENT;
+#ifdef CONFIG_MODULES
+ spin_unlock_bh(&ife->tcf_lock);
+ rtnl_unlock();
+ request_module("ifemeta%u", metaid);
+ rtnl_lock();
+ spin_lock_bh(&ife->tcf_lock);
+ ops = find_ife_oplist(metaid);
+#endif
+ }
+
+ if (ops) {
+ ret = 0;
+ if (len)
+ ret = ife_validate_metatype(ops, val, len);
+
+ module_put(ops->owner);
+ }
+
+ return ret;
+}
+
+/* called when adding new meta information
+ * under ife->tcf_lock
+*/
+static int add_metainfo(struct tcf_ife_info *ife, u32 metaid, void *metaval,
+ int len)
+{
+ struct tcf_meta_info *mi = NULL;
+ struct tcf_meta_ops *ops = find_ife_oplist(metaid);
+ int ret = 0;
+
+ if (!ops)
+ return -ENOENT;
+
+ mi = kzalloc(sizeof(*mi), GFP_KERNEL);
+ if (!mi) {
+ /*put back what find_ife_oplist took */
+ module_put(ops->owner);
+ return -ENOMEM;
+ }
+
+ mi->metaid = metaid;
+ mi->ops = ops;
+ if (len > 0) {
+ ret = ops->alloc(mi, metaval);
+ if (ret != 0) {
+ kfree(mi);
+ module_put(ops->owner);
+ return ret;
+ }
+ }
+
+ list_add_tail(&mi->metalist, &ife->metalist);
+
+ return ret;
+}
+
+static int use_all_metadata(struct tcf_ife_info *ife)
+{
+ struct tcf_meta_ops *o;
+ int rc = 0;
+ int installed = 0;
+
+ list_for_each_entry(o, &ifeoplist, list) {
+ rc = add_metainfo(ife, o->metaid, NULL, 0);
+ if (rc == 0)
+ installed += 1;
+ }
+
+ if (installed)
+ return 0;
+ else
+ return -EINVAL;
+}
+
+static int dump_metalist(struct sk_buff *skb, struct tcf_ife_info *ife)
+{
+ struct tcf_meta_info *e;
+ struct nlattr *nest;
+ unsigned char *b = skb_tail_pointer(skb);
+ int total_encoded = 0;
+
+ /*can only happen on decode */
+ if (list_empty(&ife->metalist))
+ return 0;
+
+ nest = nla_nest_start(skb, TCA_IFE_METALST);
+ if (!nest)
+ goto out_nlmsg_trim;
+
+ list_for_each_entry(e, &ife->metalist, metalist) {
+ if (!e->ops->get(skb, e))
+ total_encoded += 1;
+ }
+
+ if (!total_encoded)
+ goto out_nlmsg_trim;
+
+ nla_nest_end(skb, nest);
+
+ return 0;
+
+out_nlmsg_trim:
+ nlmsg_trim(skb, b);
+ return -1;
+}
+
+/* under ife->tcf_lock */
+static void _tcf_ife_cleanup(struct tc_action *a, int bind)
+{
+ struct tcf_ife_info *ife = a->priv;
+ struct tcf_meta_info *e, *n;
+
+ list_for_each_entry_safe(e, n, &ife->metalist, metalist) {
+ module_put(e->ops->owner);
+ list_del(&e->metalist);
+ if (e->metaval) {
+ if (e->ops->release)
+ e->ops->release(e);
+ else
+ kfree(e->metaval);
+ }
+ kfree(e);
+ }
+}
+
+static void tcf_ife_cleanup(struct tc_action *a, int bind)
+{
+ struct tcf_ife_info *ife = a->priv;
+
+ spin_lock_bh(&ife->tcf_lock);
+ _tcf_ife_cleanup(a, bind);
+ spin_unlock_bh(&ife->tcf_lock);
+}
+
+/* under ife->tcf_lock */
+static int populate_metalist(struct tcf_ife_info *ife, struct nlattr **tb)
+{
+ int len = 0;
+ int rc = 0;
+ int i = 0;
+ void *val;
+
+ for (i = 1; i < max_metacnt; i++) {
+ if (tb[i]) {
+ val = nla_data(tb[i]);
+ len = nla_len(tb[i]);
+
+ rc = load_metaops_and_vet(ife, i, val, len);
+ if (rc != 0)
+ return rc;
+
+ rc = add_metainfo(ife, i, val, len);
+ if (rc)
+ return rc;
+ }
+ }
+
+ return rc;
+}
+
+static int tcf_ife_init(struct net *net, struct nlattr *nla,
+ struct nlattr *est, struct tc_action *a,
+ int ovr, int bind)
+{
+ struct tc_action_net *tn = net_generic(net, ife_net_id);
+ struct nlattr *tb[TCA_IFE_MAX + 1];
+ struct nlattr *tb2[IFE_META_MAX + 1];
+ struct tcf_ife_info *ife;
+ struct tc_ife *parm;
+ u16 ife_type = 0;
+ u8 *daddr = NULL;
+ u8 *saddr = NULL;
+ int ret = 0;
+ int err;
+
+ err = nla_parse_nested(tb, TCA_IFE_MAX, nla, ife_policy);
+ if (err < 0)
+ return err;
+
+ if (!tb[TCA_IFE_PARMS])
+ return -EINVAL;
+
+ parm = nla_data(tb[TCA_IFE_PARMS]);
+
+ if (parm->flags & IFE_ENCODE) {
+ /* Until we get issued the ethertype, we cant have
+ * a default..
+ **/
+ if (!tb[TCA_IFE_TYPE]) {
+ pr_info("You MUST pass etherype for encoding\n");
+ return -EINVAL;
+ }
+ }
+
+ if (!tcf_hash_check(tn, parm->index, a, bind)) {
+ ret = tcf_hash_create(tn, parm->index, est, a, sizeof(*ife),
+ bind, false);
+ if (ret)
+ return ret;
+ ret = ACT_P_CREATED;
+ } else {
+ if (bind) /* dont override defaults */
+ return 0;
+ tcf_hash_release(a, bind);
+ if (!ovr)
+ return -EEXIST;
+ }
+
+ ife = to_ife(a);
+ ife->flags = parm->flags;
+
+ if (parm->flags & IFE_ENCODE) {
+ 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]);
+ }
+
+ spin_lock_bh(&ife->tcf_lock);
+ ife->tcf_action = parm->action;
+
+ if (parm->flags & IFE_ENCODE) {
+ if (daddr)
+ ether_addr_copy(ife->eth_dst, daddr);
+ else
+ eth_zero_addr(ife->eth_dst);
+
+ if (saddr)
+ ether_addr_copy(ife->eth_src, saddr);
+ else
+ eth_zero_addr(ife->eth_src);
+
+ ife->eth_type = ife_type;
+ }
+
+ 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);
+ if (err) {
+metadata_parse_err:
+ if (ret == ACT_P_CREATED)
+ _tcf_ife_cleanup(a, bind);
+
+ spin_unlock_bh(&ife->tcf_lock);
+ return err;
+ }
+
+ err = populate_metalist(ife, tb2);
+ 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_ife_cleanup(a, bind);
+
+ spin_unlock_bh(&ife->tcf_lock);
+ return err;
+ }
+ }
+
+ spin_unlock_bh(&ife->tcf_lock);
+
+ if (ret == ACT_P_CREATED)
+ tcf_hash_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 = a->priv;
+ struct tc_ife opt = {
+ .index = ife->tcf_index,
+ .refcnt = ife->tcf_refcnt - ref,
+ .bindcnt = ife->tcf_bindcnt - bind,
+ .action = ife->tcf_action,
+ .flags = ife->flags,
+ };
+ struct tcf_t t;
+
+ if (nla_put(skb, TCA_IFE_PARMS, sizeof(opt), &opt))
+ goto nla_put_failure;
+
+ t.install = jiffies_to_clock_t(jiffies - ife->tcf_tm.install);
+ t.lastuse = jiffies_to_clock_t(jiffies - ife->tcf_tm.lastuse);
+ t.expires = jiffies_to_clock_t(ife->tcf_tm.expires);
+ if (nla_put(skb, TCA_IFE_TM, sizeof(t), &t))
+ goto nla_put_failure;
+
+ if (!is_zero_ether_addr(ife->eth_dst)) {
+ if (nla_put(skb, TCA_IFE_DMAC, ETH_ALEN, ife->eth_dst))
+ goto nla_put_failure;
+ }
+
+ if (!is_zero_ether_addr(ife->eth_src)) {
+ if (nla_put(skb, TCA_IFE_SMAC, ETH_ALEN, ife->eth_src))
+ goto nla_put_failure;
+ }
+
+ if (nla_put(skb, TCA_IFE_TYPE, 2, &ife->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;
+}
+
+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 0;
+}
+
+struct ifeheadr {
+ __be16 metalen;
+ u8 tlv_data[];
+};
+
+struct meta_tlvhdr {
+ __be16 type;
+ __be16 len;
+};
+
+static int tcf_ife_decode(struct sk_buff *skb, const struct tc_action *a,
+ struct tcf_result *res)
+{
+ struct tcf_ife_info *ife = a->priv;
+ int action = ife->tcf_action;
+ struct ifeheadr *ifehdr = (struct ifeheadr *)skb->data;
+ u16 ifehdrln = ifehdr->metalen;
+ struct meta_tlvhdr *tlv = (struct meta_tlvhdr *)(ifehdr->tlv_data);
+
+ spin_lock(&ife->tcf_lock);
+ bstats_update(&ife->tcf_bstats, skb);
+ ife->tcf_tm.lastuse = jiffies;
+ spin_unlock(&ife->tcf_lock);
+
+ ifehdrln = ntohs(ifehdrln);
+ if (unlikely(!pskb_may_pull(skb, ifehdrln))) {
+ spin_lock(&ife->tcf_lock);
+ ife->tcf_qstats.drops++;
+ spin_unlock(&ife->tcf_lock);
+ return TC_ACT_SHOT;
+ }
+
+ skb_set_mac_header(skb, ifehdrln);
+ __skb_pull(skb, ifehdrln);
+ skb->protocol = eth_type_trans(skb, skb->dev);
+ ifehdrln -= IFE_METAHDRLEN;
+
+ while (ifehdrln > 0) {
+ u8 *tlvdata = (u8 *)tlv;
+ u16 mtype = tlv->type;
+ u16 mlen = tlv->len;
+
+ mtype = ntohs(mtype);
+ mlen = ntohs(mlen);
+
+ if (find_decode_metaid(skb, ife, mtype, (mlen - 4),
+ (void *)(tlvdata + 4))) {
+ /* abuse overlimits to count when we receive metadata
+ * but dont have an ops for it
+ */
+ pr_info_ratelimited("Unknown metaid %d alnlen %d\n",
+ mtype, mlen);
+ ife->tcf_qstats.overlimits++;
+ }
+
+ tlvdata += mlen;
+ ifehdrln -= mlen;
+ tlv = (struct meta_tlvhdr *)tlvdata;
+ }
+
+ 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_info *ife = a->priv;
+ int action = ife->tcf_action;
+ struct ethhdr *oethh; /* outer ether header */
+ struct ethhdr *iethh; /* inner eth 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 = skb->dev->hard_header_len;
+ u32 at = G_TC_AT(skb->tc_verd);
+ int new_len = skb->len + hdrm;
+ bool exceed_mtu = false;
+ int err;
+
+ if (at & AT_EGRESS) {
+ if (new_len > skb->dev->mtu)
+ exceed_mtu = true;
+ }
+
+ spin_lock(&ife->tcf_lock);
+ bstats_update(&ife->tcf_bstats, skb);
+ ife->tcf_tm.lastuse = jiffies;
+
+ if (!metalen) { /* no metadata to send */
+ /* abuse overlimits to count when we allow packet
+ * with no metadata
+ */
+ ife->tcf_qstats.overlimits++;
+ spin_unlock(&ife->tcf_lock);
+ return action;
+ }
+ /* could be stupid policy setup or mtu config
+ * so lets be conservative.. */
+ if ((action == TC_ACT_SHOT) || exceed_mtu) {
+ ife->tcf_qstats.drops++;
+ spin_unlock(&ife->tcf_lock);
+ return TC_ACT_SHOT;
+ }
+
+ iethh = eth_hdr(skb);
+
+ err = skb_cow_head(skb, hdrm);
+ if (unlikely(err)) {
+ ife->tcf_qstats.drops++;
+ spin_unlock(&ife->tcf_lock);
+ return TC_ACT_SHOT;
+ }
+
+ if (!(at & AT_EGRESS))
+ skb_push(skb, skb->dev->hard_header_len);
+
+ __skb_push(skb, hdrm);
+ memcpy(skb->data, iethh, skb->mac_len);
+ skb_reset_mac_header(skb);
+ oethh = eth_hdr(skb);
+
+ /*total metadata length */
+ metalen += IFE_METAHDRLEN;
+ metalen = htons(metalen);
+ memcpy((skb->data + skboff), &metalen, IFE_METAHDRLEN);
+ skboff += IFE_METAHDRLEN;
+
+ /* 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 *)(skb->data + skboff),
+ e);
+ }
+ if (err < 0) {
+ /* too corrupt to keep around if overwritten */
+ ife->tcf_qstats.drops++;
+ spin_unlock(&ife->tcf_lock);
+ return TC_ACT_SHOT;
+ }
+ skboff += err;
+ }
+
+ if (!is_zero_ether_addr(ife->eth_src))
+ ether_addr_copy(oethh->h_source, ife->eth_src);
+ else
+ ether_addr_copy(oethh->h_source, iethh->h_source);
+ if (!is_zero_ether_addr(ife->eth_dst))
+ ether_addr_copy(oethh->h_dest, ife->eth_dst);
+ else
+ ether_addr_copy(oethh->h_dest, iethh->h_dest);
+ oethh->h_proto = htons(ife->eth_type);
+
+ if (!(at & AT_EGRESS))
+ skb_pull(skb, skb->dev->hard_header_len);
+
+ spin_unlock(&ife->tcf_lock);
+
+ 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 = a->priv;
+
+ if (ife->flags & IFE_ENCODE)
+ return tcf_ife_encode(skb, a, res);
+
+ if (!(ife->flags & IFE_ENCODE))
+ return tcf_ife_decode(skb, a, res);
+
+ pr_info_ratelimited("unknown failure(policy neither de/encode\n");
+ spin_lock(&ife->tcf_lock);
+ bstats_update(&ife->tcf_bstats, skb);
+ ife->tcf_tm.lastuse = jiffies;
+ ife->tcf_qstats.drops++;
+ spin_unlock(&ife->tcf_lock);
+
+ return TC_ACT_SHOT;
+}
+
+static int tcf_ife_walker(struct net *net, struct sk_buff *skb,
+ struct netlink_callback *cb, int type,
+ struct tc_action *a)
+{
+ struct tc_action_net *tn = net_generic(net, ife_net_id);
+
+ return tcf_generic_walker(tn, skb, cb, type, a);
+}
+
+static int tcf_ife_search(struct net *net, struct tc_action *a, u32 index)
+{
+ struct tc_action_net *tn = net_generic(net, ife_net_id);
+
+ return tcf_hash_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,
+};
+
+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, IFE_TAB_MASK);
+}
+
+static void __net_exit ife_exit_net(struct net *net)
+{
+ struct tc_action_net *tn = net_generic(net, ife_net_id);
+
+ tc_action_net_exit(tn);
+}
+
+static struct pernet_operations ife_net_ops = {
+ .init = ife_init_net,
+ .exit = 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");
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