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683 lines
14 KiB
683 lines
14 KiB
// 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, <[email protected]> |
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*/ |
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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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/* |
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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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|
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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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|
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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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|
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#define ROUTE4_FAILURE ((struct route4_filter *)(-1L)) |
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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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bool ovr, 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, ovr, true, 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, bool ovr, |
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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 __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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|
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if (opt == NULL) |
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return handle ? -EINVAL : 0; |
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|
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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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|
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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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|
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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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|
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f->tp = fold->tp; |
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f->bkt = fold->bkt; |
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new = false; |
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} |
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|
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err = route4_set_parms(net, tp, base, f, handle, head, tb, |
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tca[TCA_RATE], new, ovr, extack); |
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if (err < 0) |
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goto errout; |
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|
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h = from_hash(f->handle >> 16); |
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fp = &f->bkt->ht[h]; |
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for (pfp = rtnl_dereference(*fp); |
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(f1 = rtnl_dereference(*fp)) != NULL; |
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fp = &f1->next) |
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if (f->handle < f1->handle) |
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break; |
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|
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tcf_block_netif_keep_dst(tp->chain->block); |
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rcu_assign_pointer(f->next, f1); |
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rcu_assign_pointer(*fp, f); |
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|
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if (fold && fold->handle && f->handle != fold->handle) { |
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th = to_hash(fold->handle); |
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h = from_hash(fold->handle >> 16); |
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b = rtnl_dereference(head->table[th]); |
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if (b) { |
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fp = &b->ht[h]; |
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for (pfp = rtnl_dereference(*fp); pfp; |
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fp = &pfp->next, pfp = rtnl_dereference(*fp)) { |
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if (pfp == fold) { |
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rcu_assign_pointer(*fp, fold->next); |
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break; |
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} |
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} |
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} |
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} |
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|
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route4_reset_fastmap(head); |
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*arg = f; |
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if (fold) { |
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tcf_unbind_filter(tp, &fold->res); |
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tcf_exts_get_net(&fold->exts); |
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tcf_queue_work(&fold->rwork, route4_delete_filter_work); |
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} |
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return 0; |
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errout: |
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if (f) |
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tcf_exts_destroy(&f->exts); |
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kfree(f); |
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return err; |
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} |
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|
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static void route4_walk(struct tcf_proto *tp, struct tcf_walker *arg, |
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bool rtnl_held) |
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{ |
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struct route4_head *head = rtnl_dereference(tp->root); |
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unsigned int h, h1; |
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|
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if (head == NULL || arg->stop) |
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return; |
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|
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for (h = 0; h <= 256; h++) { |
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struct route4_bucket *b = rtnl_dereference(head->table[h]); |
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|
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if (b) { |
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for (h1 = 0; h1 <= 32; h1++) { |
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struct route4_filter *f; |
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|
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for (f = rtnl_dereference(b->ht[h1]); |
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f; |
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f = rtnl_dereference(f->next)) { |
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if (arg->count < arg->skip) { |
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arg->count++; |
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continue; |
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} |
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if (arg->fn(tp, f, arg) < 0) { |
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arg->stop = 1; |
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return; |
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} |
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arg->count++; |
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} |
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} |
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} |
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} |
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} |
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|
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static int route4_dump(struct net *net, struct tcf_proto *tp, void *fh, |
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struct sk_buff *skb, struct tcmsg *t, bool rtnl_held) |
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{ |
|
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");
|
|
|