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944 lines
21 KiB
944 lines
21 KiB
// 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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|
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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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|
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static unsigned int ife_net_id; |
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static int max_metacnt = IFE_META_MAX + 1; |
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static struct tc_action_ops act_ife_ops; |
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|
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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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|
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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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|
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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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|
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if (!edata) /* will not encode */ |
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return 0; |
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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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if (!edata) /* will not encode */ |
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return 0; |
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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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static LIST_HEAD(ifeoplist); |
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static DEFINE_RWLOCK(ife_mod_lock); |
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|
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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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|
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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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|
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return NULL; |
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} |
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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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|
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write_lock(&ife_mod_lock); |
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|
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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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|
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if (!mops->release) |
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mops->release = ife_release_meta_gen; |
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|
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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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|
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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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|
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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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|
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return err; |
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} |
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EXPORT_SYMBOL_GPL(register_ife_op); |
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|
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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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|
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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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|
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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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|
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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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|
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module_put(ops->owner); |
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} |
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|
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return ret; |
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} |
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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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|
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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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|
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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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|
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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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|
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return ret; |
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} |
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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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|
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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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|
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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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|
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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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|
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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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|
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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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} |
|
|
|
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: |
|
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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{ |
|
struct tcf_ife_info *ife = to_ife(a); |
|
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) |
|
e->ops->release(e); |
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else |
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kfree(e->metaval); |
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} |
|
module_put(e->ops->owner); |
|
kfree(e); |
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} |
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} |
|
|
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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); |
|
|
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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, |
|
int ovr, int bind, bool rtnl_held, |
|
struct tcf_proto *tp, u32 flags, |
|
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_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, rtnl_held); |
|
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, 0); |
|
if (ret) { |
|
tcf_idr_cleanup(tn, 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); |
|
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, 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) |
|
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_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 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", |
|
.id = TCA_ID_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(net, 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");
|
|
|