| /* |
| * 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> |
| #include <net/ife.h> |
| |
| static unsigned int ife_net_id; |
| 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(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(o, ife, o->metaid, NULL, 0, true, 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(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) { |
| 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) |
| { |
| 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 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 = load_metaops_and_vet(i, val, len, rtnl_held); |
| if (rc != 0) |
| return rc; |
| |
| 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, |
| int ovr, int bind, bool rtnl_held, |
| struct netlink_ext_ack *extack) |
| { |
| 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_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; |
| int err; |
| |
| err = nla_parse_nested(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; |
| |
| err = tcf_idr_check_alloc(tn, &parm->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, parm->index, est, a, &act_ife_ops, |
| bind, true); |
| if (ret) { |
| tcf_idr_cleanup(tn, parm->index); |
| kfree(p); |
| return ret; |
| } |
| ret = ACT_P_CREATED; |
| } else if (!ovr) { |
| tcf_idr_release(*a, bind); |
| kfree(p); |
| return -EEXIST; |
| } |
| |
| ife = to_ife(*a); |
| 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 (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: |
| tcf_idr_release(*a, bind); |
| kfree(p); |
| return err; |
| } |
| |
| err = populate_metalist(ife, tb2, exists, rtnl_held); |
| 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) { |
| tcf_idr_release(*a, bind); |
| kfree(p); |
| return err; |
| } |
| } |
| |
| if (exists) |
| spin_lock_bh(&ife->tcf_lock); |
| ife->tcf_action = parm->action; |
| /* protected by tcf_lock when modifying existing action */ |
| rcu_swap_protected(ife->params, p, 1); |
| |
| if (exists) |
| spin_unlock_bh(&ife->tcf_lock); |
| if (p) |
| kfree_rcu(p, 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; |
| 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_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; |
| |
| 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 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"); |