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-rw-r--r--net/sched/act_ife.c925
1 files changed, 925 insertions, 0 deletions
diff --git a/net/sched/act_ife.c b/net/sched/act_ife.c
new file mode 100644
index 000000000..41d63b334
--- /dev/null
+++ b/net/sched/act_ife.c
@@ -0,0 +1,925 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * 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
+ *
+ * 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 <net/pkt_cls.h>
+#include <uapi/linux/tc_act/tc_ife.h>
+#include <net/tc_act/tc_ife.h>
+#include <linux/etherdevice.h>
+#include <net/ife.h>
+
+static int max_metacnt = IFE_META_MAX + 1;
+static struct tc_action_ops act_ife_ops;
+
+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},
+};
+
+int ife_encode_meta_u16(u16 metaval, void *skbdata, struct tcf_meta_info *mi)
+{
+ u16 edata = 0;
+
+ if (mi->metaval)
+ edata = *(u16 *)mi->metaval;
+ else if (metaval)
+ edata = metaval;
+
+ if (!edata) /* will not encode */
+ return 0;
+
+ edata = htons(edata);
+ return ife_tlv_meta_encode(skbdata, mi->metaid, 2, &edata);
+}
+EXPORT_SYMBOL_GPL(ife_encode_meta_u16);
+
+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_check_meta_u16(u16 metaval, struct tcf_meta_info *mi)
+{
+ if (metaval || mi->metaval)
+ return 8; /* T+L+(V) == 2+2+(2+2bytepad) */
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(ife_check_meta_u16);
+
+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, gfp_t gfp)
+{
+ mi->metaval = kmemdup(metaval, sizeof(u32), gfp);
+ 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, gfp_t gfp)
+{
+ mi->metaval = kmemdup(metaval, sizeof(u16), gfp);
+ 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 == sizeof(u32))
+ return 0;
+
+ return -EINVAL;
+}
+EXPORT_SYMBOL_GPL(ife_validate_meta_u32);
+
+int ife_validate_meta_u16(void *val, int len)
+{
+ /* length will not include padding */
+ if (len == sizeof(u16))
+ 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;
+}
+
+#ifdef CONFIG_MODULES
+static const char *ife_meta_id2name(u32 metaid)
+{
+ switch (metaid) {
+ case IFE_META_SKBMARK:
+ return "skbmark";
+ case IFE_META_PRIO:
+ return "skbprio";
+ case IFE_META_TCINDEX:
+ return "tcindex";
+ default:
+ return "unknown";
+ }
+}
+#endif
+
+/* called when adding new meta information
+*/
+static int load_metaops_and_vet(u32 metaid, void *val, int len, bool rtnl_held)
+{
+ struct tcf_meta_ops *ops = find_ife_oplist(metaid);
+ int ret = 0;
+
+ if (!ops) {
+ ret = -ENOENT;
+#ifdef CONFIG_MODULES
+ if (rtnl_held)
+ rtnl_unlock();
+ request_module("ife-meta-%s", ife_meta_id2name(metaid));
+ if (rtnl_held)
+ rtnl_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
+*/
+static int __add_metainfo(const struct tcf_meta_ops *ops,
+ struct tcf_ife_info *ife, u32 metaid, void *metaval,
+ int len, bool atomic, bool exists)
+{
+ struct tcf_meta_info *mi = NULL;
+ int ret = 0;
+
+ mi = kzalloc(sizeof(*mi), atomic ? GFP_ATOMIC : GFP_KERNEL);
+ if (!mi)
+ return -ENOMEM;
+
+ mi->metaid = metaid;
+ mi->ops = ops;
+ if (len > 0) {
+ ret = ops->alloc(mi, metaval, atomic ? GFP_ATOMIC : GFP_KERNEL);
+ if (ret != 0) {
+ kfree(mi);
+ return ret;
+ }
+ }
+
+ if (exists)
+ spin_lock_bh(&ife->tcf_lock);
+ list_add_tail(&mi->metalist, &ife->metalist);
+ if (exists)
+ spin_unlock_bh(&ife->tcf_lock);
+
+ return ret;
+}
+
+static int add_metainfo_and_get_ops(const struct tcf_meta_ops *ops,
+ struct tcf_ife_info *ife, u32 metaid,
+ bool exists)
+{
+ int ret;
+
+ if (!try_module_get(ops->owner))
+ return -ENOENT;
+ ret = __add_metainfo(ops, ife, metaid, NULL, 0, true, exists);
+ if (ret)
+ module_put(ops->owner);
+ return ret;
+}
+
+static int add_metainfo(struct tcf_ife_info *ife, u32 metaid, void *metaval,
+ int len, bool exists)
+{
+ const struct tcf_meta_ops *ops = find_ife_oplist(metaid);
+ int ret;
+
+ if (!ops)
+ return -ENOENT;
+ ret = __add_metainfo(ops, ife, metaid, metaval, len, false, exists);
+ if (ret)
+ /*put back what find_ife_oplist took */
+ module_put(ops->owner);
+ return ret;
+}
+
+static int use_all_metadata(struct tcf_ife_info *ife, bool exists)
+{
+ struct tcf_meta_ops *o;
+ int rc = 0;
+ int installed = 0;
+
+ read_lock(&ife_mod_lock);
+ list_for_each_entry(o, &ifeoplist, list) {
+ rc = add_metainfo_and_get_ops(o, ife, o->metaid, exists);
+ if (rc == 0)
+ installed += 1;
+ }
+ read_unlock(&ife_mod_lock);
+
+ 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_noflag(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)
+{
+ struct tcf_ife_info *ife = to_ife(a);
+ struct tcf_meta_info *e, *n;
+
+ list_for_each_entry_safe(e, n, &ife->metalist, metalist) {
+ list_del(&e->metalist);
+ if (e->metaval) {
+ if (e->ops->release)
+ e->ops->release(e);
+ else
+ kfree(e->metaval);
+ }
+ module_put(e->ops->owner);
+ kfree(e);
+ }
+}
+
+static void tcf_ife_cleanup(struct tc_action *a)
+{
+ struct tcf_ife_info *ife = to_ife(a);
+ struct tcf_ife_params *p;
+
+ spin_lock_bh(&ife->tcf_lock);
+ _tcf_ife_cleanup(a);
+ spin_unlock_bh(&ife->tcf_lock);
+
+ p = rcu_dereference_protected(ife->params, 1);
+ if (p)
+ kfree_rcu(p, rcu);
+}
+
+static int load_metalist(struct nlattr **tb, bool rtnl_held)
+{
+ int i;
+
+ for (i = 1; i < max_metacnt; i++) {
+ if (tb[i]) {
+ void *val = nla_data(tb[i]);
+ int len = nla_len(tb[i]);
+ int rc;
+
+ rc = load_metaops_and_vet(i, val, len, rtnl_held);
+ if (rc != 0)
+ return rc;
+ }
+ }
+
+ return 0;
+}
+
+static int populate_metalist(struct tcf_ife_info *ife, struct nlattr **tb,
+ bool exists, bool rtnl_held)
+{
+ 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 = add_metainfo(ife, i, val, len, exists);
+ if (rc)
+ return rc;
+ }
+ }
+
+ return rc;
+}
+
+static int tcf_ife_init(struct net *net, struct nlattr *nla,
+ struct nlattr *est, struct tc_action **a,
+ struct tcf_proto *tp, u32 flags,
+ struct netlink_ext_ack *extack)
+{
+ struct tc_action_net *tn = net_generic(net, act_ife_ops.net_id);
+ bool bind = flags & TCA_ACT_FLAGS_BIND;
+ struct nlattr *tb[TCA_IFE_MAX + 1];
+ struct nlattr *tb2[IFE_META_MAX + 1];
+ struct tcf_chain *goto_ch = NULL;
+ struct tcf_ife_params *p;
+ struct tcf_ife_info *ife;
+ u16 ife_type = ETH_P_IFE;
+ struct tc_ife *parm;
+ u8 *daddr = NULL;
+ u8 *saddr = NULL;
+ bool exists = false;
+ int ret = 0;
+ u32 index;
+ int err;
+
+ if (!nla) {
+ NL_SET_ERR_MSG_MOD(extack, "IFE requires attributes to be passed");
+ return -EINVAL;
+ }
+
+ err = nla_parse_nested_deprecated(tb, TCA_IFE_MAX, nla, ife_policy,
+ NULL);
+ if (err < 0)
+ return err;
+
+ if (!tb[TCA_IFE_PARMS])
+ return -EINVAL;
+
+ parm = nla_data(tb[TCA_IFE_PARMS]);
+
+ /* IFE_DECODE is 0 and indicates the opposite of IFE_ENCODE because
+ * they cannot run as the same time. Check on all other values which
+ * are not supported right now.
+ */
+ if (parm->flags & ~IFE_ENCODE)
+ return -EINVAL;
+
+ 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;
+}
+
+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;
+
+ 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");