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![Cong Wang](/assets/img/avatar_default.png)
TC action ->init() API has 10 parameters, it becomes harder to read. Some of them are just boolean and can be replaced by flags. Similarly for the internal API tcf_action_init() and tcf_exts_validate(). This patch converts them to flags and fold them into the upper 16 bits of "flags", whose lower 16 bits are still reserved for user-space. More specifically, the following kernel flags are introduced: TCA_ACT_FLAGS_POLICE replace 'name' in a few contexts, to distinguish whether it is compatible with policer. TCA_ACT_FLAGS_BIND replaces 'bind', to indicate whether this action is bound to a filter. TCA_ACT_FLAGS_REPLACE replaces 'ovr' in most contexts, means we are replacing an existing action. TCA_ACT_FLAGS_NO_RTNL replaces 'rtnl_held' but has the opposite meaning, because we still hold RTNL in most cases. The only user-space flag TCA_ACT_FLAGS_NO_PERCPU_STATS is untouched and still stored as before. I have tested this patch with tdc and I do not see any failure related to this patch. Tested-by: Vlad Buslov <vladbu@nvidia.com> Acked-by: Jamal Hadi Salim<jhs@mojatatu.com> Cc: Jiri Pirko <jiri@resnulli.us> Signed-off-by: Cong Wang <cong.wang@bytedance.com> Signed-off-by: David S. Miller <davem@davemloft.net>
683 lines
14 KiB
C
683 lines
14 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* net/sched/cls_route.c ROUTE4 classifier.
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*
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* Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
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*/
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#include <linux/module.h>
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#include <linux/slab.h>
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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 <net/dst.h>
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#include <net/route.h>
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#include <net/netlink.h>
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#include <net/act_api.h>
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#include <net/pkt_cls.h>
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/*
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* 1. For now we assume that route tags < 256.
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* It allows to use direct table lookups, instead of hash tables.
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* 2. For now we assume that "from TAG" and "fromdev DEV" statements
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* are mutually exclusive.
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* 3. "to TAG from ANY" has higher priority, than "to ANY from XXX"
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*/
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struct route4_fastmap {
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struct route4_filter *filter;
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u32 id;
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int iif;
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};
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struct route4_head {
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struct route4_fastmap fastmap[16];
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struct route4_bucket __rcu *table[256 + 1];
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struct rcu_head rcu;
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};
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struct route4_bucket {
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/* 16 FROM buckets + 16 IIF buckets + 1 wildcard bucket */
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struct route4_filter __rcu *ht[16 + 16 + 1];
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struct rcu_head rcu;
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};
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struct route4_filter {
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struct route4_filter __rcu *next;
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u32 id;
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int iif;
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struct tcf_result res;
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struct tcf_exts exts;
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u32 handle;
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struct route4_bucket *bkt;
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struct tcf_proto *tp;
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struct rcu_work rwork;
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};
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#define ROUTE4_FAILURE ((struct route4_filter *)(-1L))
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static inline int route4_fastmap_hash(u32 id, int iif)
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{
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return id & 0xF;
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}
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static DEFINE_SPINLOCK(fastmap_lock);
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static void
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route4_reset_fastmap(struct route4_head *head)
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{
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spin_lock_bh(&fastmap_lock);
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memset(head->fastmap, 0, sizeof(head->fastmap));
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spin_unlock_bh(&fastmap_lock);
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}
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static void
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route4_set_fastmap(struct route4_head *head, u32 id, int iif,
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struct route4_filter *f)
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{
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int h = route4_fastmap_hash(id, iif);
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/* fastmap updates must look atomic to aling id, iff, filter */
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spin_lock_bh(&fastmap_lock);
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head->fastmap[h].id = id;
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head->fastmap[h].iif = iif;
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head->fastmap[h].filter = f;
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spin_unlock_bh(&fastmap_lock);
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}
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static inline int route4_hash_to(u32 id)
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{
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return id & 0xFF;
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}
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static inline int route4_hash_from(u32 id)
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{
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return (id >> 16) & 0xF;
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}
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static inline int route4_hash_iif(int iif)
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{
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return 16 + ((iif >> 16) & 0xF);
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}
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static inline int route4_hash_wild(void)
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{
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return 32;
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}
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#define ROUTE4_APPLY_RESULT() \
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{ \
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*res = f->res; \
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if (tcf_exts_has_actions(&f->exts)) { \
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int r = tcf_exts_exec(skb, &f->exts, res); \
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if (r < 0) { \
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dont_cache = 1; \
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continue; \
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} \
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return r; \
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} else if (!dont_cache) \
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route4_set_fastmap(head, id, iif, f); \
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return 0; \
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}
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static int route4_classify(struct sk_buff *skb, const struct tcf_proto *tp,
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struct tcf_result *res)
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{
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struct route4_head *head = rcu_dereference_bh(tp->root);
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struct dst_entry *dst;
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struct route4_bucket *b;
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struct route4_filter *f;
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u32 id, h;
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int iif, dont_cache = 0;
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dst = skb_dst(skb);
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if (!dst)
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goto failure;
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id = dst->tclassid;
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iif = inet_iif(skb);
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h = route4_fastmap_hash(id, iif);
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spin_lock(&fastmap_lock);
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if (id == head->fastmap[h].id &&
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iif == head->fastmap[h].iif &&
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(f = head->fastmap[h].filter) != NULL) {
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if (f == ROUTE4_FAILURE) {
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spin_unlock(&fastmap_lock);
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goto failure;
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}
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*res = f->res;
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spin_unlock(&fastmap_lock);
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return 0;
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}
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spin_unlock(&fastmap_lock);
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h = route4_hash_to(id);
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restart:
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b = rcu_dereference_bh(head->table[h]);
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if (b) {
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for (f = rcu_dereference_bh(b->ht[route4_hash_from(id)]);
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f;
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f = rcu_dereference_bh(f->next))
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if (f->id == id)
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ROUTE4_APPLY_RESULT();
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for (f = rcu_dereference_bh(b->ht[route4_hash_iif(iif)]);
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f;
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f = rcu_dereference_bh(f->next))
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if (f->iif == iif)
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ROUTE4_APPLY_RESULT();
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for (f = rcu_dereference_bh(b->ht[route4_hash_wild()]);
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f;
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f = rcu_dereference_bh(f->next))
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ROUTE4_APPLY_RESULT();
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}
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if (h < 256) {
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h = 256;
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id &= ~0xFFFF;
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goto restart;
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}
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if (!dont_cache)
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route4_set_fastmap(head, id, iif, ROUTE4_FAILURE);
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failure:
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return -1;
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}
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static inline u32 to_hash(u32 id)
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{
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u32 h = id & 0xFF;
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if (id & 0x8000)
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h += 256;
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return h;
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}
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static inline u32 from_hash(u32 id)
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{
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id &= 0xFFFF;
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if (id == 0xFFFF)
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return 32;
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if (!(id & 0x8000)) {
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if (id > 255)
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return 256;
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return id & 0xF;
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}
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return 16 + (id & 0xF);
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}
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static void *route4_get(struct tcf_proto *tp, u32 handle)
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{
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struct route4_head *head = rtnl_dereference(tp->root);
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struct route4_bucket *b;
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struct route4_filter *f;
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unsigned int h1, h2;
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h1 = to_hash(handle);
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if (h1 > 256)
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return NULL;
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h2 = from_hash(handle >> 16);
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if (h2 > 32)
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return NULL;
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b = rtnl_dereference(head->table[h1]);
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if (b) {
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for (f = rtnl_dereference(b->ht[h2]);
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f;
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f = rtnl_dereference(f->next))
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if (f->handle == handle)
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return f;
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}
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return NULL;
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}
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static int route4_init(struct tcf_proto *tp)
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{
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struct route4_head *head;
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head = kzalloc(sizeof(struct route4_head), GFP_KERNEL);
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if (head == NULL)
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return -ENOBUFS;
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rcu_assign_pointer(tp->root, head);
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return 0;
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}
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static void __route4_delete_filter(struct route4_filter *f)
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{
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tcf_exts_destroy(&f->exts);
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tcf_exts_put_net(&f->exts);
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kfree(f);
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}
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static void route4_delete_filter_work(struct work_struct *work)
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{
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struct route4_filter *f = container_of(to_rcu_work(work),
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struct route4_filter,
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rwork);
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rtnl_lock();
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__route4_delete_filter(f);
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rtnl_unlock();
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}
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static void route4_queue_work(struct route4_filter *f)
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{
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tcf_queue_work(&f->rwork, route4_delete_filter_work);
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}
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static void route4_destroy(struct tcf_proto *tp, bool rtnl_held,
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struct netlink_ext_ack *extack)
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{
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struct route4_head *head = rtnl_dereference(tp->root);
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int h1, h2;
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if (head == NULL)
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return;
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for (h1 = 0; h1 <= 256; h1++) {
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struct route4_bucket *b;
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b = rtnl_dereference(head->table[h1]);
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if (b) {
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for (h2 = 0; h2 <= 32; h2++) {
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struct route4_filter *f;
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while ((f = rtnl_dereference(b->ht[h2])) != NULL) {
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struct route4_filter *next;
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next = rtnl_dereference(f->next);
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RCU_INIT_POINTER(b->ht[h2], next);
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tcf_unbind_filter(tp, &f->res);
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if (tcf_exts_get_net(&f->exts))
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route4_queue_work(f);
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else
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__route4_delete_filter(f);
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}
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}
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RCU_INIT_POINTER(head->table[h1], NULL);
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kfree_rcu(b, rcu);
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}
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}
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kfree_rcu(head, rcu);
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}
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static int route4_delete(struct tcf_proto *tp, void *arg, bool *last,
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bool rtnl_held, struct netlink_ext_ack *extack)
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{
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struct route4_head *head = rtnl_dereference(tp->root);
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struct route4_filter *f = arg;
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struct route4_filter __rcu **fp;
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struct route4_filter *nf;
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struct route4_bucket *b;
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unsigned int h = 0;
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int i, h1;
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if (!head || !f)
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return -EINVAL;
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h = f->handle;
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b = f->bkt;
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fp = &b->ht[from_hash(h >> 16)];
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for (nf = rtnl_dereference(*fp); nf;
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fp = &nf->next, nf = rtnl_dereference(*fp)) {
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if (nf == f) {
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/* unlink it */
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RCU_INIT_POINTER(*fp, rtnl_dereference(f->next));
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/* Remove any fastmap lookups that might ref filter
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* notice we unlink'd the filter so we can't get it
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* back in the fastmap.
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*/
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route4_reset_fastmap(head);
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/* Delete it */
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tcf_unbind_filter(tp, &f->res);
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tcf_exts_get_net(&f->exts);
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tcf_queue_work(&f->rwork, route4_delete_filter_work);
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/* Strip RTNL protected tree */
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for (i = 0; i <= 32; i++) {
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struct route4_filter *rt;
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rt = rtnl_dereference(b->ht[i]);
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if (rt)
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goto out;
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}
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/* OK, session has no flows */
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RCU_INIT_POINTER(head->table[to_hash(h)], NULL);
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kfree_rcu(b, rcu);
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break;
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}
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}
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out:
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*last = true;
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for (h1 = 0; h1 <= 256; h1++) {
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if (rcu_access_pointer(head->table[h1])) {
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*last = false;
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break;
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}
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}
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return 0;
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}
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static const struct nla_policy route4_policy[TCA_ROUTE4_MAX + 1] = {
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[TCA_ROUTE4_CLASSID] = { .type = NLA_U32 },
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[TCA_ROUTE4_TO] = { .type = NLA_U32 },
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[TCA_ROUTE4_FROM] = { .type = NLA_U32 },
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[TCA_ROUTE4_IIF] = { .type = NLA_U32 },
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};
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static int route4_set_parms(struct net *net, struct tcf_proto *tp,
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unsigned long base, struct route4_filter *f,
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u32 handle, struct route4_head *head,
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struct nlattr **tb, struct nlattr *est, int new,
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u32 flags, struct netlink_ext_ack *extack)
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{
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u32 id = 0, to = 0, nhandle = 0x8000;
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struct route4_filter *fp;
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unsigned int h1;
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struct route4_bucket *b;
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int err;
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err = tcf_exts_validate(net, tp, tb, est, &f->exts, flags, extack);
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if (err < 0)
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return err;
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if (tb[TCA_ROUTE4_TO]) {
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if (new && handle & 0x8000)
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return -EINVAL;
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to = nla_get_u32(tb[TCA_ROUTE4_TO]);
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if (to > 0xFF)
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return -EINVAL;
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nhandle = to;
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}
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if (tb[TCA_ROUTE4_FROM]) {
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if (tb[TCA_ROUTE4_IIF])
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return -EINVAL;
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id = nla_get_u32(tb[TCA_ROUTE4_FROM]);
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if (id > 0xFF)
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return -EINVAL;
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nhandle |= id << 16;
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} else if (tb[TCA_ROUTE4_IIF]) {
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id = nla_get_u32(tb[TCA_ROUTE4_IIF]);
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if (id > 0x7FFF)
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return -EINVAL;
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nhandle |= (id | 0x8000) << 16;
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} else
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nhandle |= 0xFFFF << 16;
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if (handle && new) {
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nhandle |= handle & 0x7F00;
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if (nhandle != handle)
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return -EINVAL;
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}
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h1 = to_hash(nhandle);
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b = rtnl_dereference(head->table[h1]);
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if (!b) {
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b = kzalloc(sizeof(struct route4_bucket), GFP_KERNEL);
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if (b == NULL)
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return -ENOBUFS;
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rcu_assign_pointer(head->table[h1], b);
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} else {
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unsigned int h2 = from_hash(nhandle >> 16);
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for (fp = rtnl_dereference(b->ht[h2]);
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fp;
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fp = rtnl_dereference(fp->next))
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if (fp->handle == f->handle)
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return -EEXIST;
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}
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if (tb[TCA_ROUTE4_TO])
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f->id = to;
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if (tb[TCA_ROUTE4_FROM])
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f->id = to | id<<16;
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else if (tb[TCA_ROUTE4_IIF])
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f->iif = id;
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f->handle = nhandle;
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f->bkt = b;
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f->tp = tp;
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if (tb[TCA_ROUTE4_CLASSID]) {
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f->res.classid = nla_get_u32(tb[TCA_ROUTE4_CLASSID]);
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tcf_bind_filter(tp, &f->res, base);
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}
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return 0;
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}
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static int route4_change(struct net *net, struct sk_buff *in_skb,
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struct tcf_proto *tp, unsigned long base, u32 handle,
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struct nlattr **tca, void **arg, u32 flags,
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struct netlink_ext_ack *extack)
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{
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struct route4_head *head = rtnl_dereference(tp->root);
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struct route4_filter __rcu **fp;
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struct route4_filter *fold, *f1, *pfp, *f = NULL;
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struct route4_bucket *b;
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struct nlattr *opt = tca[TCA_OPTIONS];
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struct nlattr *tb[TCA_ROUTE4_MAX + 1];
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unsigned int h, th;
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int err;
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bool new = true;
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if (opt == NULL)
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return handle ? -EINVAL : 0;
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err = nla_parse_nested_deprecated(tb, TCA_ROUTE4_MAX, opt,
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route4_policy, NULL);
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if (err < 0)
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return err;
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fold = *arg;
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if (fold && handle && fold->handle != handle)
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return -EINVAL;
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err = -ENOBUFS;
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f = kzalloc(sizeof(struct route4_filter), GFP_KERNEL);
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if (!f)
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goto errout;
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err = tcf_exts_init(&f->exts, net, TCA_ROUTE4_ACT, TCA_ROUTE4_POLICE);
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if (err < 0)
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goto errout;
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if (fold) {
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f->id = fold->id;
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f->iif = fold->iif;
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f->res = fold->res;
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f->handle = fold->handle;
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|
|
|
f->tp = fold->tp;
|
|
f->bkt = fold->bkt;
|
|
new = false;
|
|
}
|
|
|
|
err = route4_set_parms(net, tp, base, f, handle, head, tb,
|
|
tca[TCA_RATE], new, flags, extack);
|
|
if (err < 0)
|
|
goto errout;
|
|
|
|
h = from_hash(f->handle >> 16);
|
|
fp = &f->bkt->ht[h];
|
|
for (pfp = rtnl_dereference(*fp);
|
|
(f1 = rtnl_dereference(*fp)) != NULL;
|
|
fp = &f1->next)
|
|
if (f->handle < f1->handle)
|
|
break;
|
|
|
|
tcf_block_netif_keep_dst(tp->chain->block);
|
|
rcu_assign_pointer(f->next, f1);
|
|
rcu_assign_pointer(*fp, f);
|
|
|
|
if (fold && fold->handle && f->handle != fold->handle) {
|
|
th = to_hash(fold->handle);
|
|
h = from_hash(fold->handle >> 16);
|
|
b = rtnl_dereference(head->table[th]);
|
|
if (b) {
|
|
fp = &b->ht[h];
|
|
for (pfp = rtnl_dereference(*fp); pfp;
|
|
fp = &pfp->next, pfp = rtnl_dereference(*fp)) {
|
|
if (pfp == fold) {
|
|
rcu_assign_pointer(*fp, fold->next);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
route4_reset_fastmap(head);
|
|
*arg = f;
|
|
if (fold) {
|
|
tcf_unbind_filter(tp, &fold->res);
|
|
tcf_exts_get_net(&fold->exts);
|
|
tcf_queue_work(&fold->rwork, route4_delete_filter_work);
|
|
}
|
|
return 0;
|
|
|
|
errout:
|
|
if (f)
|
|
tcf_exts_destroy(&f->exts);
|
|
kfree(f);
|
|
return err;
|
|
}
|
|
|
|
static void route4_walk(struct tcf_proto *tp, struct tcf_walker *arg,
|
|
bool rtnl_held)
|
|
{
|
|
struct route4_head *head = rtnl_dereference(tp->root);
|
|
unsigned int h, h1;
|
|
|
|
if (head == NULL || arg->stop)
|
|
return;
|
|
|
|
for (h = 0; h <= 256; h++) {
|
|
struct route4_bucket *b = rtnl_dereference(head->table[h]);
|
|
|
|
if (b) {
|
|
for (h1 = 0; h1 <= 32; h1++) {
|
|
struct route4_filter *f;
|
|
|
|
for (f = rtnl_dereference(b->ht[h1]);
|
|
f;
|
|
f = rtnl_dereference(f->next)) {
|
|
if (arg->count < arg->skip) {
|
|
arg->count++;
|
|
continue;
|
|
}
|
|
if (arg->fn(tp, f, arg) < 0) {
|
|
arg->stop = 1;
|
|
return;
|
|
}
|
|
arg->count++;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
static int route4_dump(struct net *net, struct tcf_proto *tp, void *fh,
|
|
struct sk_buff *skb, struct tcmsg *t, bool rtnl_held)
|
|
{
|
|
struct route4_filter *f = fh;
|
|
struct nlattr *nest;
|
|
u32 id;
|
|
|
|
if (f == NULL)
|
|
return skb->len;
|
|
|
|
t->tcm_handle = f->handle;
|
|
|
|
nest = nla_nest_start_noflag(skb, TCA_OPTIONS);
|
|
if (nest == NULL)
|
|
goto nla_put_failure;
|
|
|
|
if (!(f->handle & 0x8000)) {
|
|
id = f->id & 0xFF;
|
|
if (nla_put_u32(skb, TCA_ROUTE4_TO, id))
|
|
goto nla_put_failure;
|
|
}
|
|
if (f->handle & 0x80000000) {
|
|
if ((f->handle >> 16) != 0xFFFF &&
|
|
nla_put_u32(skb, TCA_ROUTE4_IIF, f->iif))
|
|
goto nla_put_failure;
|
|
} else {
|
|
id = f->id >> 16;
|
|
if (nla_put_u32(skb, TCA_ROUTE4_FROM, id))
|
|
goto nla_put_failure;
|
|
}
|
|
if (f->res.classid &&
|
|
nla_put_u32(skb, TCA_ROUTE4_CLASSID, f->res.classid))
|
|
goto nla_put_failure;
|
|
|
|
if (tcf_exts_dump(skb, &f->exts) < 0)
|
|
goto nla_put_failure;
|
|
|
|
nla_nest_end(skb, nest);
|
|
|
|
if (tcf_exts_dump_stats(skb, &f->exts) < 0)
|
|
goto nla_put_failure;
|
|
|
|
return skb->len;
|
|
|
|
nla_put_failure:
|
|
nla_nest_cancel(skb, nest);
|
|
return -1;
|
|
}
|
|
|
|
static void route4_bind_class(void *fh, u32 classid, unsigned long cl, void *q,
|
|
unsigned long base)
|
|
{
|
|
struct route4_filter *f = fh;
|
|
|
|
if (f && f->res.classid == classid) {
|
|
if (cl)
|
|
__tcf_bind_filter(q, &f->res, base);
|
|
else
|
|
__tcf_unbind_filter(q, &f->res);
|
|
}
|
|
}
|
|
|
|
static struct tcf_proto_ops cls_route4_ops __read_mostly = {
|
|
.kind = "route",
|
|
.classify = route4_classify,
|
|
.init = route4_init,
|
|
.destroy = route4_destroy,
|
|
.get = route4_get,
|
|
.change = route4_change,
|
|
.delete = route4_delete,
|
|
.walk = route4_walk,
|
|
.dump = route4_dump,
|
|
.bind_class = route4_bind_class,
|
|
.owner = THIS_MODULE,
|
|
};
|
|
|
|
static int __init init_route4(void)
|
|
{
|
|
return register_tcf_proto_ops(&cls_route4_ops);
|
|
}
|
|
|
|
static void __exit exit_route4(void)
|
|
{
|
|
unregister_tcf_proto_ops(&cls_route4_ops);
|
|
}
|
|
|
|
module_init(init_route4)
|
|
module_exit(exit_route4)
|
|
MODULE_LICENSE("GPL");
|