![WANG Cong](/assets/img/avatar_default.png)
This fixes the following crash: [ 63.976822] general protection fault: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC [ 63.980094] CPU: 1 PID: 15 Comm: ksoftirqd/1 Not tainted 3.17.0-rc6+ #648 [ 63.980094] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 63.980094] task: ffff880117dea690 ti: ffff880117dfc000 task.ti: ffff880117dfc000 [ 63.980094] RIP: 0010:[<ffffffff817e6d07>] [<ffffffff817e6d07>] u32_destroy_key+0x27/0x6d [ 63.980094] RSP: 0018:ffff880117dffcc0 EFLAGS: 00010202 [ 63.980094] RAX: ffff880117dea690 RBX: ffff8800d02e0820 RCX: 0000000000000000 [ 63.980094] RDX: 0000000000000001 RSI: 0000000000000002 RDI: 6b6b6b6b6b6b6b6b [ 63.980094] RBP: ffff880117dffcd0 R08: 0000000000000000 R09: 0000000000000000 [ 63.980094] R10: 00006c0900006ba8 R11: 00006ba100006b9d R12: 0000000000000001 [ 63.980094] R13: ffff8800d02e0898 R14: ffffffff817e6d4d R15: ffff880117387a30 [ 63.980094] FS: 0000000000000000(0000) GS:ffff88011a800000(0000) knlGS:0000000000000000 [ 63.980094] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b [ 63.980094] CR2: 00007f07e6732fed CR3: 000000011665b000 CR4: 00000000000006e0 [ 63.980094] Stack: [ 63.980094] ffff88011a9cd300 ffffffff82051ac0 ffff880117dffce0 ffffffff817e6d68 [ 63.980094] ffff880117dffd70 ffffffff810cb4c7 ffffffff810cb3cd ffff880117dfffd8 [ 63.980094] ffff880117dea690 ffff880117dea690 ffff880117dfffd8 000000000000000a [ 63.980094] Call Trace: [ 63.980094] [<ffffffff817e6d68>] u32_delete_key_freepf_rcu+0x1b/0x1d [ 63.980094] [<ffffffff810cb4c7>] rcu_process_callbacks+0x3bb/0x691 [ 63.980094] [<ffffffff810cb3cd>] ? rcu_process_callbacks+0x2c1/0x691 [ 63.980094] [<ffffffff817e6d4d>] ? u32_destroy_key+0x6d/0x6d [ 63.980094] [<ffffffff810780a4>] __do_softirq+0x142/0x323 [ 63.980094] [<ffffffff810782a8>] run_ksoftirqd+0x23/0x53 [ 63.980094] [<ffffffff81092126>] smpboot_thread_fn+0x203/0x221 [ 63.980094] [<ffffffff81091f23>] ? smpboot_unpark_thread+0x33/0x33 [ 63.980094] [<ffffffff8108e44d>] kthread+0xc9/0xd1 [ 63.980094] [<ffffffff819e00ea>] ? do_wait_for_common+0xf8/0x125 [ 63.980094] [<ffffffff8108e384>] ? __kthread_parkme+0x61/0x61 [ 63.980094] [<ffffffff819e43ec>] ret_from_fork+0x7c/0xb0 [ 63.980094] [<ffffffff8108e384>] ? __kthread_parkme+0x61/0x61 tp could be freed in call_rcu callback too, the order is not guaranteed. John Fastabend says: ==================== Its worth noting why this is safe. Any running schedulers will either read the valid class field or it will be zeroed. All schedulers today when the class is 0 do a lookup using the same call used by the tcf_exts_bind(). So even if we have a running classifier hit the null class pointer it will do a lookup and get to the same result. This is particularly fragile at the moment because the only way to verify this is to audit the schedulers call sites. ==================== Cc: John Fastabend <john.r.fastabend@intel.com> Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com> Acked-by: John Fastabend <john.r.fastabend@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
1055 lines
23 KiB
C
1055 lines
23 KiB
C
/*
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* net/sched/cls_u32.c Ugly (or Universal) 32bit key Packet Classifier.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
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*
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* The filters are packed to hash tables of key nodes
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* with a set of 32bit key/mask pairs at every node.
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* Nodes reference next level hash tables etc.
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*
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* This scheme is the best universal classifier I managed to
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* invent; it is not super-fast, but it is not slow (provided you
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* program it correctly), and general enough. And its relative
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* speed grows as the number of rules becomes larger.
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*
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* It seems that it represents the best middle point between
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* speed and manageability both by human and by machine.
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*
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* It is especially useful for link sharing combined with QoS;
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* pure RSVP doesn't need such a general approach and can use
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* much simpler (and faster) schemes, sort of cls_rsvp.c.
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*
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* JHS: We should remove the CONFIG_NET_CLS_IND from here
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* eventually when the meta match extension is made available
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*
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* nfmark match added by Catalin(ux aka Dino) BOIE <catab at umbrella.ro>
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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/percpu.h>
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#include <linux/rtnetlink.h>
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#include <linux/skbuff.h>
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#include <linux/bitmap.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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struct tc_u_knode {
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struct tc_u_knode __rcu *next;
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u32 handle;
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struct tc_u_hnode __rcu *ht_up;
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struct tcf_exts exts;
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#ifdef CONFIG_NET_CLS_IND
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int ifindex;
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#endif
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u8 fshift;
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struct tcf_result res;
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struct tc_u_hnode __rcu *ht_down;
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#ifdef CONFIG_CLS_U32_PERF
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struct tc_u32_pcnt __percpu *pf;
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#endif
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#ifdef CONFIG_CLS_U32_MARK
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u32 val;
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u32 mask;
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u32 __percpu *pcpu_success;
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#endif
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struct tcf_proto *tp;
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struct rcu_head rcu;
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/* The 'sel' field MUST be the last field in structure to allow for
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* tc_u32_keys allocated at end of structure.
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*/
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struct tc_u32_sel sel;
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};
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struct tc_u_hnode {
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struct tc_u_hnode __rcu *next;
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u32 handle;
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u32 prio;
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struct tc_u_common *tp_c;
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int refcnt;
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unsigned int divisor;
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struct tc_u_knode __rcu *ht[1];
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struct rcu_head rcu;
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};
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struct tc_u_common {
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struct tc_u_hnode __rcu *hlist;
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struct Qdisc *q;
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int refcnt;
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u32 hgenerator;
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struct rcu_head rcu;
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};
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static inline unsigned int u32_hash_fold(__be32 key,
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const struct tc_u32_sel *sel,
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u8 fshift)
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{
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unsigned int h = ntohl(key & sel->hmask) >> fshift;
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return h;
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}
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static int u32_classify(struct sk_buff *skb, const struct tcf_proto *tp, struct tcf_result *res)
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{
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struct {
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struct tc_u_knode *knode;
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unsigned int off;
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} stack[TC_U32_MAXDEPTH];
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struct tc_u_hnode *ht = rcu_dereference_bh(tp->root);
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unsigned int off = skb_network_offset(skb);
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struct tc_u_knode *n;
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int sdepth = 0;
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int off2 = 0;
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int sel = 0;
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#ifdef CONFIG_CLS_U32_PERF
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int j;
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#endif
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int i, r;
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next_ht:
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n = rcu_dereference_bh(ht->ht[sel]);
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next_knode:
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if (n) {
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struct tc_u32_key *key = n->sel.keys;
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#ifdef CONFIG_CLS_U32_PERF
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__this_cpu_inc(n->pf->rcnt);
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j = 0;
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#endif
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#ifdef CONFIG_CLS_U32_MARK
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if ((skb->mark & n->mask) != n->val) {
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n = rcu_dereference_bh(n->next);
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goto next_knode;
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} else {
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__this_cpu_inc(*n->pcpu_success);
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}
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#endif
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for (i = n->sel.nkeys; i > 0; i--, key++) {
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int toff = off + key->off + (off2 & key->offmask);
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__be32 *data, hdata;
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if (skb_headroom(skb) + toff > INT_MAX)
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goto out;
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data = skb_header_pointer(skb, toff, 4, &hdata);
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if (!data)
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goto out;
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if ((*data ^ key->val) & key->mask) {
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n = rcu_dereference_bh(n->next);
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goto next_knode;
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}
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#ifdef CONFIG_CLS_U32_PERF
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__this_cpu_inc(n->pf->kcnts[j]);
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j++;
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#endif
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}
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ht = rcu_dereference_bh(n->ht_down);
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if (!ht) {
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check_terminal:
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if (n->sel.flags & TC_U32_TERMINAL) {
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*res = n->res;
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#ifdef CONFIG_NET_CLS_IND
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if (!tcf_match_indev(skb, n->ifindex)) {
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n = rcu_dereference_bh(n->next);
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goto next_knode;
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}
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#endif
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#ifdef CONFIG_CLS_U32_PERF
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__this_cpu_inc(n->pf->rhit);
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#endif
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r = tcf_exts_exec(skb, &n->exts, res);
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if (r < 0) {
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n = rcu_dereference_bh(n->next);
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goto next_knode;
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}
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return r;
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}
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n = rcu_dereference_bh(n->next);
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goto next_knode;
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}
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/* PUSH */
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if (sdepth >= TC_U32_MAXDEPTH)
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goto deadloop;
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stack[sdepth].knode = n;
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stack[sdepth].off = off;
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sdepth++;
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ht = rcu_dereference_bh(n->ht_down);
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sel = 0;
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if (ht->divisor) {
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__be32 *data, hdata;
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data = skb_header_pointer(skb, off + n->sel.hoff, 4,
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&hdata);
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if (!data)
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goto out;
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sel = ht->divisor & u32_hash_fold(*data, &n->sel,
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n->fshift);
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}
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if (!(n->sel.flags & (TC_U32_VAROFFSET | TC_U32_OFFSET | TC_U32_EAT)))
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goto next_ht;
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if (n->sel.flags & (TC_U32_OFFSET | TC_U32_VAROFFSET)) {
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off2 = n->sel.off + 3;
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if (n->sel.flags & TC_U32_VAROFFSET) {
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__be16 *data, hdata;
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data = skb_header_pointer(skb,
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off + n->sel.offoff,
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2, &hdata);
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if (!data)
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goto out;
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off2 += ntohs(n->sel.offmask & *data) >>
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n->sel.offshift;
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}
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off2 &= ~3;
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}
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if (n->sel.flags & TC_U32_EAT) {
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off += off2;
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off2 = 0;
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}
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if (off < skb->len)
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goto next_ht;
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}
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/* POP */
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if (sdepth--) {
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n = stack[sdepth].knode;
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ht = rcu_dereference_bh(n->ht_up);
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off = stack[sdepth].off;
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goto check_terminal;
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}
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out:
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return -1;
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deadloop:
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net_warn_ratelimited("cls_u32: dead loop\n");
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return -1;
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}
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static struct tc_u_hnode *
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u32_lookup_ht(struct tc_u_common *tp_c, u32 handle)
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{
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struct tc_u_hnode *ht;
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for (ht = rtnl_dereference(tp_c->hlist);
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ht;
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ht = rtnl_dereference(ht->next))
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if (ht->handle == handle)
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break;
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return ht;
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}
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static struct tc_u_knode *
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u32_lookup_key(struct tc_u_hnode *ht, u32 handle)
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{
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unsigned int sel;
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struct tc_u_knode *n = NULL;
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sel = TC_U32_HASH(handle);
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if (sel > ht->divisor)
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goto out;
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for (n = rtnl_dereference(ht->ht[sel]);
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n;
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n = rtnl_dereference(n->next))
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if (n->handle == handle)
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break;
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out:
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return n;
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}
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static unsigned long u32_get(struct tcf_proto *tp, u32 handle)
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{
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struct tc_u_hnode *ht;
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struct tc_u_common *tp_c = tp->data;
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if (TC_U32_HTID(handle) == TC_U32_ROOT)
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ht = rtnl_dereference(tp->root);
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else
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ht = u32_lookup_ht(tp_c, TC_U32_HTID(handle));
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if (!ht)
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return 0;
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if (TC_U32_KEY(handle) == 0)
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return (unsigned long)ht;
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return (unsigned long)u32_lookup_key(ht, handle);
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}
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static void u32_put(struct tcf_proto *tp, unsigned long f)
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{
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}
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static u32 gen_new_htid(struct tc_u_common *tp_c)
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{
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int i = 0x800;
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/* hgenerator only used inside rtnl lock it is safe to increment
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* without read _copy_ update semantics
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*/
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do {
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if (++tp_c->hgenerator == 0x7FF)
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tp_c->hgenerator = 1;
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} while (--i > 0 && u32_lookup_ht(tp_c, (tp_c->hgenerator|0x800)<<20));
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return i > 0 ? (tp_c->hgenerator|0x800)<<20 : 0;
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}
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static int u32_init(struct tcf_proto *tp)
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{
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struct tc_u_hnode *root_ht;
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struct tc_u_common *tp_c;
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tp_c = tp->q->u32_node;
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root_ht = kzalloc(sizeof(*root_ht), GFP_KERNEL);
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if (root_ht == NULL)
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return -ENOBUFS;
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root_ht->divisor = 0;
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root_ht->refcnt++;
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root_ht->handle = tp_c ? gen_new_htid(tp_c) : 0x80000000;
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root_ht->prio = tp->prio;
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if (tp_c == NULL) {
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tp_c = kzalloc(sizeof(*tp_c), GFP_KERNEL);
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if (tp_c == NULL) {
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kfree(root_ht);
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return -ENOBUFS;
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}
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tp_c->q = tp->q;
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tp->q->u32_node = tp_c;
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}
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tp_c->refcnt++;
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RCU_INIT_POINTER(root_ht->next, tp_c->hlist);
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rcu_assign_pointer(tp_c->hlist, root_ht);
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root_ht->tp_c = tp_c;
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rcu_assign_pointer(tp->root, root_ht);
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tp->data = tp_c;
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return 0;
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}
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static int u32_destroy_key(struct tcf_proto *tp,
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struct tc_u_knode *n,
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bool free_pf)
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{
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tcf_exts_destroy(&n->exts);
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if (n->ht_down)
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n->ht_down->refcnt--;
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#ifdef CONFIG_CLS_U32_PERF
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if (free_pf)
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free_percpu(n->pf);
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#endif
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#ifdef CONFIG_CLS_U32_MARK
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if (free_pf)
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free_percpu(n->pcpu_success);
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#endif
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kfree(n);
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return 0;
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}
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/* u32_delete_key_rcu should be called when free'ing a copied
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* version of a tc_u_knode obtained from u32_init_knode(). When
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* copies are obtained from u32_init_knode() the statistics are
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* shared between the old and new copies to allow readers to
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* continue to update the statistics during the copy. To support
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* this the u32_delete_key_rcu variant does not free the percpu
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* statistics.
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*/
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static void u32_delete_key_rcu(struct rcu_head *rcu)
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{
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struct tc_u_knode *key = container_of(rcu, struct tc_u_knode, rcu);
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u32_destroy_key(key->tp, key, false);
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}
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/* u32_delete_key_freepf_rcu is the rcu callback variant
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* that free's the entire structure including the statistics
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* percpu variables. Only use this if the key is not a copy
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* returned by u32_init_knode(). See u32_delete_key_rcu()
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* for the variant that should be used with keys return from
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* u32_init_knode()
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*/
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static void u32_delete_key_freepf_rcu(struct rcu_head *rcu)
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{
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struct tc_u_knode *key = container_of(rcu, struct tc_u_knode, rcu);
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u32_destroy_key(key->tp, key, true);
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}
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static int u32_delete_key(struct tcf_proto *tp, struct tc_u_knode *key)
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{
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struct tc_u_knode __rcu **kp;
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struct tc_u_knode *pkp;
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struct tc_u_hnode *ht = rtnl_dereference(key->ht_up);
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if (ht) {
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kp = &ht->ht[TC_U32_HASH(key->handle)];
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for (pkp = rtnl_dereference(*kp); pkp;
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kp = &pkp->next, pkp = rtnl_dereference(*kp)) {
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if (pkp == key) {
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RCU_INIT_POINTER(*kp, key->next);
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tcf_unbind_filter(tp, &key->res);
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call_rcu(&key->rcu, u32_delete_key_freepf_rcu);
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return 0;
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}
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}
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}
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WARN_ON(1);
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return 0;
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}
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|
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static void u32_clear_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht)
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{
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struct tc_u_knode *n;
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unsigned int h;
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for (h = 0; h <= ht->divisor; h++) {
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while ((n = rtnl_dereference(ht->ht[h])) != NULL) {
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RCU_INIT_POINTER(ht->ht[h],
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rtnl_dereference(n->next));
|
|
tcf_unbind_filter(tp, &n->res);
|
|
call_rcu(&n->rcu, u32_delete_key_freepf_rcu);
|
|
}
|
|
}
|
|
}
|
|
|
|
static int u32_destroy_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht)
|
|
{
|
|
struct tc_u_common *tp_c = tp->data;
|
|
struct tc_u_hnode __rcu **hn;
|
|
struct tc_u_hnode *phn;
|
|
|
|
WARN_ON(ht->refcnt);
|
|
|
|
u32_clear_hnode(tp, ht);
|
|
|
|
hn = &tp_c->hlist;
|
|
for (phn = rtnl_dereference(*hn);
|
|
phn;
|
|
hn = &phn->next, phn = rtnl_dereference(*hn)) {
|
|
if (phn == ht) {
|
|
RCU_INIT_POINTER(*hn, ht->next);
|
|
kfree_rcu(ht, rcu);
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
return -ENOENT;
|
|
}
|
|
|
|
static void u32_destroy(struct tcf_proto *tp)
|
|
{
|
|
struct tc_u_common *tp_c = tp->data;
|
|
struct tc_u_hnode *root_ht = rtnl_dereference(tp->root);
|
|
|
|
WARN_ON(root_ht == NULL);
|
|
|
|
if (root_ht && --root_ht->refcnt == 0)
|
|
u32_destroy_hnode(tp, root_ht);
|
|
|
|
if (--tp_c->refcnt == 0) {
|
|
struct tc_u_hnode *ht;
|
|
|
|
tp->q->u32_node = NULL;
|
|
|
|
for (ht = rtnl_dereference(tp_c->hlist);
|
|
ht;
|
|
ht = rtnl_dereference(ht->next)) {
|
|
ht->refcnt--;
|
|
u32_clear_hnode(tp, ht);
|
|
}
|
|
|
|
while ((ht = rtnl_dereference(tp_c->hlist)) != NULL) {
|
|
RCU_INIT_POINTER(tp_c->hlist, ht->next);
|
|
kfree_rcu(ht, rcu);
|
|
}
|
|
|
|
kfree(tp_c);
|
|
}
|
|
|
|
tp->data = NULL;
|
|
}
|
|
|
|
static int u32_delete(struct tcf_proto *tp, unsigned long arg)
|
|
{
|
|
struct tc_u_hnode *ht = (struct tc_u_hnode *)arg;
|
|
struct tc_u_hnode *root_ht = rtnl_dereference(tp->root);
|
|
|
|
if (ht == NULL)
|
|
return 0;
|
|
|
|
if (TC_U32_KEY(ht->handle))
|
|
return u32_delete_key(tp, (struct tc_u_knode *)ht);
|
|
|
|
if (root_ht == ht)
|
|
return -EINVAL;
|
|
|
|
if (ht->refcnt == 1) {
|
|
ht->refcnt--;
|
|
u32_destroy_hnode(tp, ht);
|
|
} else {
|
|
return -EBUSY;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
#define NR_U32_NODE (1<<12)
|
|
static u32 gen_new_kid(struct tc_u_hnode *ht, u32 handle)
|
|
{
|
|
struct tc_u_knode *n;
|
|
unsigned long i;
|
|
unsigned long *bitmap = kzalloc(BITS_TO_LONGS(NR_U32_NODE) * sizeof(unsigned long),
|
|
GFP_KERNEL);
|
|
if (!bitmap)
|
|
return handle | 0xFFF;
|
|
|
|
for (n = rtnl_dereference(ht->ht[TC_U32_HASH(handle)]);
|
|
n;
|
|
n = rtnl_dereference(n->next))
|
|
set_bit(TC_U32_NODE(n->handle), bitmap);
|
|
|
|
i = find_next_zero_bit(bitmap, NR_U32_NODE, 0x800);
|
|
if (i >= NR_U32_NODE)
|
|
i = find_next_zero_bit(bitmap, NR_U32_NODE, 1);
|
|
|
|
kfree(bitmap);
|
|
return handle | (i >= NR_U32_NODE ? 0xFFF : i);
|
|
}
|
|
|
|
static const struct nla_policy u32_policy[TCA_U32_MAX + 1] = {
|
|
[TCA_U32_CLASSID] = { .type = NLA_U32 },
|
|
[TCA_U32_HASH] = { .type = NLA_U32 },
|
|
[TCA_U32_LINK] = { .type = NLA_U32 },
|
|
[TCA_U32_DIVISOR] = { .type = NLA_U32 },
|
|
[TCA_U32_SEL] = { .len = sizeof(struct tc_u32_sel) },
|
|
[TCA_U32_INDEV] = { .type = NLA_STRING, .len = IFNAMSIZ },
|
|
[TCA_U32_MARK] = { .len = sizeof(struct tc_u32_mark) },
|
|
};
|
|
|
|
static int u32_set_parms(struct net *net, struct tcf_proto *tp,
|
|
unsigned long base, struct tc_u_hnode *ht,
|
|
struct tc_u_knode *n, struct nlattr **tb,
|
|
struct nlattr *est, bool ovr)
|
|
{
|
|
int err;
|
|
struct tcf_exts e;
|
|
|
|
tcf_exts_init(&e, TCA_U32_ACT, TCA_U32_POLICE);
|
|
err = tcf_exts_validate(net, tp, tb, est, &e, ovr);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
err = -EINVAL;
|
|
if (tb[TCA_U32_LINK]) {
|
|
u32 handle = nla_get_u32(tb[TCA_U32_LINK]);
|
|
struct tc_u_hnode *ht_down = NULL, *ht_old;
|
|
|
|
if (TC_U32_KEY(handle))
|
|
goto errout;
|
|
|
|
if (handle) {
|
|
ht_down = u32_lookup_ht(ht->tp_c, handle);
|
|
|
|
if (ht_down == NULL)
|
|
goto errout;
|
|
ht_down->refcnt++;
|
|
}
|
|
|
|
ht_old = rtnl_dereference(n->ht_down);
|
|
rcu_assign_pointer(n->ht_down, ht_down);
|
|
|
|
if (ht_old)
|
|
ht_old->refcnt--;
|
|
}
|
|
if (tb[TCA_U32_CLASSID]) {
|
|
n->res.classid = nla_get_u32(tb[TCA_U32_CLASSID]);
|
|
tcf_bind_filter(tp, &n->res, base);
|
|
}
|
|
|
|
#ifdef CONFIG_NET_CLS_IND
|
|
if (tb[TCA_U32_INDEV]) {
|
|
int ret;
|
|
ret = tcf_change_indev(net, tb[TCA_U32_INDEV]);
|
|
if (ret < 0)
|
|
goto errout;
|
|
n->ifindex = ret;
|
|
}
|
|
#endif
|
|
tcf_exts_change(tp, &n->exts, &e);
|
|
|
|
return 0;
|
|
errout:
|
|
tcf_exts_destroy(&e);
|
|
return err;
|
|
}
|
|
|
|
static void u32_replace_knode(struct tcf_proto *tp,
|
|
struct tc_u_common *tp_c,
|
|
struct tc_u_knode *n)
|
|
{
|
|
struct tc_u_knode __rcu **ins;
|
|
struct tc_u_knode *pins;
|
|
struct tc_u_hnode *ht;
|
|
|
|
if (TC_U32_HTID(n->handle) == TC_U32_ROOT)
|
|
ht = rtnl_dereference(tp->root);
|
|
else
|
|
ht = u32_lookup_ht(tp_c, TC_U32_HTID(n->handle));
|
|
|
|
ins = &ht->ht[TC_U32_HASH(n->handle)];
|
|
|
|
/* The node must always exist for it to be replaced if this is not the
|
|
* case then something went very wrong elsewhere.
|
|
*/
|
|
for (pins = rtnl_dereference(*ins); ;
|
|
ins = &pins->next, pins = rtnl_dereference(*ins))
|
|
if (pins->handle == n->handle)
|
|
break;
|
|
|
|
RCU_INIT_POINTER(n->next, pins->next);
|
|
rcu_assign_pointer(*ins, n);
|
|
}
|
|
|
|
static struct tc_u_knode *u32_init_knode(struct tcf_proto *tp,
|
|
struct tc_u_knode *n)
|
|
{
|
|
struct tc_u_knode *new;
|
|
struct tc_u32_sel *s = &n->sel;
|
|
|
|
new = kzalloc(sizeof(*n) + s->nkeys*sizeof(struct tc_u32_key),
|
|
GFP_KERNEL);
|
|
|
|
if (!new)
|
|
return NULL;
|
|
|
|
RCU_INIT_POINTER(new->next, n->next);
|
|
new->handle = n->handle;
|
|
RCU_INIT_POINTER(new->ht_up, n->ht_up);
|
|
|
|
#ifdef CONFIG_NET_CLS_IND
|
|
new->ifindex = n->ifindex;
|
|
#endif
|
|
new->fshift = n->fshift;
|
|
new->res = n->res;
|
|
RCU_INIT_POINTER(new->ht_down, n->ht_down);
|
|
|
|
/* bump reference count as long as we hold pointer to structure */
|
|
if (new->ht_down)
|
|
new->ht_down->refcnt++;
|
|
|
|
#ifdef CONFIG_CLS_U32_PERF
|
|
/* Statistics may be incremented by readers during update
|
|
* so we must keep them in tact. When the node is later destroyed
|
|
* a special destroy call must be made to not free the pf memory.
|
|
*/
|
|
new->pf = n->pf;
|
|
#endif
|
|
|
|
#ifdef CONFIG_CLS_U32_MARK
|
|
new->val = n->val;
|
|
new->mask = n->mask;
|
|
/* Similarly success statistics must be moved as pointers */
|
|
new->pcpu_success = n->pcpu_success;
|
|
#endif
|
|
new->tp = tp;
|
|
memcpy(&new->sel, s, sizeof(*s) + s->nkeys*sizeof(struct tc_u32_key));
|
|
|
|
tcf_exts_init(&new->exts, TCA_U32_ACT, TCA_U32_POLICE);
|
|
|
|
return new;
|
|
}
|
|
|
|
static int u32_change(struct net *net, struct sk_buff *in_skb,
|
|
struct tcf_proto *tp, unsigned long base, u32 handle,
|
|
struct nlattr **tca,
|
|
unsigned long *arg, bool ovr)
|
|
{
|
|
struct tc_u_common *tp_c = tp->data;
|
|
struct tc_u_hnode *ht;
|
|
struct tc_u_knode *n;
|
|
struct tc_u32_sel *s;
|
|
struct nlattr *opt = tca[TCA_OPTIONS];
|
|
struct nlattr *tb[TCA_U32_MAX + 1];
|
|
u32 htid;
|
|
int err;
|
|
#ifdef CONFIG_CLS_U32_PERF
|
|
size_t size;
|
|
#endif
|
|
|
|
if (opt == NULL)
|
|
return handle ? -EINVAL : 0;
|
|
|
|
err = nla_parse_nested(tb, TCA_U32_MAX, opt, u32_policy);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
n = (struct tc_u_knode *)*arg;
|
|
if (n) {
|
|
struct tc_u_knode *new;
|
|
|
|
if (TC_U32_KEY(n->handle) == 0)
|
|
return -EINVAL;
|
|
|
|
new = u32_init_knode(tp, n);
|
|
if (!new)
|
|
return -ENOMEM;
|
|
|
|
err = u32_set_parms(net, tp, base,
|
|
rtnl_dereference(n->ht_up), new, tb,
|
|
tca[TCA_RATE], ovr);
|
|
|
|
if (err) {
|
|
u32_destroy_key(tp, new, false);
|
|
return err;
|
|
}
|
|
|
|
u32_replace_knode(tp, tp_c, new);
|
|
tcf_unbind_filter(tp, &n->res);
|
|
call_rcu(&n->rcu, u32_delete_key_rcu);
|
|
return 0;
|
|
}
|
|
|
|
if (tb[TCA_U32_DIVISOR]) {
|
|
unsigned int divisor = nla_get_u32(tb[TCA_U32_DIVISOR]);
|
|
|
|
if (--divisor > 0x100)
|
|
return -EINVAL;
|
|
if (TC_U32_KEY(handle))
|
|
return -EINVAL;
|
|
if (handle == 0) {
|
|
handle = gen_new_htid(tp->data);
|
|
if (handle == 0)
|
|
return -ENOMEM;
|
|
}
|
|
ht = kzalloc(sizeof(*ht) + divisor*sizeof(void *), GFP_KERNEL);
|
|
if (ht == NULL)
|
|
return -ENOBUFS;
|
|
ht->tp_c = tp_c;
|
|
ht->refcnt = 1;
|
|
ht->divisor = divisor;
|
|
ht->handle = handle;
|
|
ht->prio = tp->prio;
|
|
RCU_INIT_POINTER(ht->next, tp_c->hlist);
|
|
rcu_assign_pointer(tp_c->hlist, ht);
|
|
*arg = (unsigned long)ht;
|
|
return 0;
|
|
}
|
|
|
|
if (tb[TCA_U32_HASH]) {
|
|
htid = nla_get_u32(tb[TCA_U32_HASH]);
|
|
if (TC_U32_HTID(htid) == TC_U32_ROOT) {
|
|
ht = rtnl_dereference(tp->root);
|
|
htid = ht->handle;
|
|
} else {
|
|
ht = u32_lookup_ht(tp->data, TC_U32_HTID(htid));
|
|
if (ht == NULL)
|
|
return -EINVAL;
|
|
}
|
|
} else {
|
|
ht = rtnl_dereference(tp->root);
|
|
htid = ht->handle;
|
|
}
|
|
|
|
if (ht->divisor < TC_U32_HASH(htid))
|
|
return -EINVAL;
|
|
|
|
if (handle) {
|
|
if (TC_U32_HTID(handle) && TC_U32_HTID(handle^htid))
|
|
return -EINVAL;
|
|
handle = htid | TC_U32_NODE(handle);
|
|
} else
|
|
handle = gen_new_kid(ht, htid);
|
|
|
|
if (tb[TCA_U32_SEL] == NULL)
|
|
return -EINVAL;
|
|
|
|
s = nla_data(tb[TCA_U32_SEL]);
|
|
|
|
n = kzalloc(sizeof(*n) + s->nkeys*sizeof(struct tc_u32_key), GFP_KERNEL);
|
|
if (n == NULL)
|
|
return -ENOBUFS;
|
|
|
|
#ifdef CONFIG_CLS_U32_PERF
|
|
size = sizeof(struct tc_u32_pcnt) + s->nkeys * sizeof(u64);
|
|
n->pf = __alloc_percpu(size, __alignof__(struct tc_u32_pcnt));
|
|
if (!n->pf) {
|
|
kfree(n);
|
|
return -ENOBUFS;
|
|
}
|
|
#endif
|
|
|
|
memcpy(&n->sel, s, sizeof(*s) + s->nkeys*sizeof(struct tc_u32_key));
|
|
RCU_INIT_POINTER(n->ht_up, ht);
|
|
n->handle = handle;
|
|
n->fshift = s->hmask ? ffs(ntohl(s->hmask)) - 1 : 0;
|
|
tcf_exts_init(&n->exts, TCA_U32_ACT, TCA_U32_POLICE);
|
|
n->tp = tp;
|
|
|
|
#ifdef CONFIG_CLS_U32_MARK
|
|
n->pcpu_success = alloc_percpu(u32);
|
|
if (!n->pcpu_success) {
|
|
err = -ENOMEM;
|
|
goto errout;
|
|
}
|
|
|
|
if (tb[TCA_U32_MARK]) {
|
|
struct tc_u32_mark *mark;
|
|
|
|
mark = nla_data(tb[TCA_U32_MARK]);
|
|
n->val = mark->val;
|
|
n->mask = mark->mask;
|
|
}
|
|
#endif
|
|
|
|
err = u32_set_parms(net, tp, base, ht, n, tb, tca[TCA_RATE], ovr);
|
|
if (err == 0) {
|
|
struct tc_u_knode __rcu **ins;
|
|
struct tc_u_knode *pins;
|
|
|
|
ins = &ht->ht[TC_U32_HASH(handle)];
|
|
for (pins = rtnl_dereference(*ins); pins;
|
|
ins = &pins->next, pins = rtnl_dereference(*ins))
|
|
if (TC_U32_NODE(handle) < TC_U32_NODE(pins->handle))
|
|
break;
|
|
|
|
RCU_INIT_POINTER(n->next, pins);
|
|
rcu_assign_pointer(*ins, n);
|
|
|
|
*arg = (unsigned long)n;
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_CLS_U32_MARK
|
|
free_percpu(n->pcpu_success);
|
|
errout:
|
|
#endif
|
|
|
|
#ifdef CONFIG_CLS_U32_PERF
|
|
free_percpu(n->pf);
|
|
#endif
|
|
kfree(n);
|
|
return err;
|
|
}
|
|
|
|
static void u32_walk(struct tcf_proto *tp, struct tcf_walker *arg)
|
|
{
|
|
struct tc_u_common *tp_c = tp->data;
|
|
struct tc_u_hnode *ht;
|
|
struct tc_u_knode *n;
|
|
unsigned int h;
|
|
|
|
if (arg->stop)
|
|
return;
|
|
|
|
for (ht = rtnl_dereference(tp_c->hlist);
|
|
ht;
|
|
ht = rtnl_dereference(ht->next)) {
|
|
if (ht->prio != tp->prio)
|
|
continue;
|
|
if (arg->count >= arg->skip) {
|
|
if (arg->fn(tp, (unsigned long)ht, arg) < 0) {
|
|
arg->stop = 1;
|
|
return;
|
|
}
|
|
}
|
|
arg->count++;
|
|
for (h = 0; h <= ht->divisor; h++) {
|
|
for (n = rtnl_dereference(ht->ht[h]);
|
|
n;
|
|
n = rtnl_dereference(n->next)) {
|
|
if (arg->count < arg->skip) {
|
|
arg->count++;
|
|
continue;
|
|
}
|
|
if (arg->fn(tp, (unsigned long)n, arg) < 0) {
|
|
arg->stop = 1;
|
|
return;
|
|
}
|
|
arg->count++;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
static int u32_dump(struct net *net, struct tcf_proto *tp, unsigned long fh,
|
|
struct sk_buff *skb, struct tcmsg *t)
|
|
{
|
|
struct tc_u_knode *n = (struct tc_u_knode *)fh;
|
|
struct tc_u_hnode *ht_up, *ht_down;
|
|
struct nlattr *nest;
|
|
|
|
if (n == NULL)
|
|
return skb->len;
|
|
|
|
t->tcm_handle = n->handle;
|
|
|
|
nest = nla_nest_start(skb, TCA_OPTIONS);
|
|
if (nest == NULL)
|
|
goto nla_put_failure;
|
|
|
|
if (TC_U32_KEY(n->handle) == 0) {
|
|
struct tc_u_hnode *ht = (struct tc_u_hnode *)fh;
|
|
u32 divisor = ht->divisor + 1;
|
|
|
|
if (nla_put_u32(skb, TCA_U32_DIVISOR, divisor))
|
|
goto nla_put_failure;
|
|
} else {
|
|
#ifdef CONFIG_CLS_U32_PERF
|
|
struct tc_u32_pcnt *gpf;
|
|
int cpu;
|
|
#endif
|
|
|
|
if (nla_put(skb, TCA_U32_SEL,
|
|
sizeof(n->sel) + n->sel.nkeys*sizeof(struct tc_u32_key),
|
|
&n->sel))
|
|
goto nla_put_failure;
|
|
|
|
ht_up = rtnl_dereference(n->ht_up);
|
|
if (ht_up) {
|
|
u32 htid = n->handle & 0xFFFFF000;
|
|
if (nla_put_u32(skb, TCA_U32_HASH, htid))
|
|
goto nla_put_failure;
|
|
}
|
|
if (n->res.classid &&
|
|
nla_put_u32(skb, TCA_U32_CLASSID, n->res.classid))
|
|
goto nla_put_failure;
|
|
|
|
ht_down = rtnl_dereference(n->ht_down);
|
|
if (ht_down &&
|
|
nla_put_u32(skb, TCA_U32_LINK, ht_down->handle))
|
|
goto nla_put_failure;
|
|
|
|
#ifdef CONFIG_CLS_U32_MARK
|
|
if ((n->val || n->mask)) {
|
|
struct tc_u32_mark mark = {.val = n->val,
|
|
.mask = n->mask,
|
|
.success = 0};
|
|
int cpum;
|
|
|
|
for_each_possible_cpu(cpum) {
|
|
__u32 cnt = *per_cpu_ptr(n->pcpu_success, cpum);
|
|
|
|
mark.success += cnt;
|
|
}
|
|
|
|
if (nla_put(skb, TCA_U32_MARK, sizeof(mark), &mark))
|
|
goto nla_put_failure;
|
|
}
|
|
#endif
|
|
|
|
if (tcf_exts_dump(skb, &n->exts) < 0)
|
|
goto nla_put_failure;
|
|
|
|
#ifdef CONFIG_NET_CLS_IND
|
|
if (n->ifindex) {
|
|
struct net_device *dev;
|
|
dev = __dev_get_by_index(net, n->ifindex);
|
|
if (dev && nla_put_string(skb, TCA_U32_INDEV, dev->name))
|
|
goto nla_put_failure;
|
|
}
|
|
#endif
|
|
#ifdef CONFIG_CLS_U32_PERF
|
|
gpf = kzalloc(sizeof(struct tc_u32_pcnt) +
|
|
n->sel.nkeys * sizeof(u64),
|
|
GFP_KERNEL);
|
|
if (!gpf)
|
|
goto nla_put_failure;
|
|
|
|
for_each_possible_cpu(cpu) {
|
|
int i;
|
|
struct tc_u32_pcnt *pf = per_cpu_ptr(n->pf, cpu);
|
|
|
|
gpf->rcnt += pf->rcnt;
|
|
gpf->rhit += pf->rhit;
|
|
for (i = 0; i < n->sel.nkeys; i++)
|
|
gpf->kcnts[i] += pf->kcnts[i];
|
|
}
|
|
|
|
if (nla_put(skb, TCA_U32_PCNT,
|
|
sizeof(struct tc_u32_pcnt) + n->sel.nkeys*sizeof(u64),
|
|
gpf)) {
|
|
kfree(gpf);
|
|
goto nla_put_failure;
|
|
}
|
|
kfree(gpf);
|
|
#endif
|
|
}
|
|
|
|
nla_nest_end(skb, nest);
|
|
|
|
if (TC_U32_KEY(n->handle))
|
|
if (tcf_exts_dump_stats(skb, &n->exts) < 0)
|
|
goto nla_put_failure;
|
|
return skb->len;
|
|
|
|
nla_put_failure:
|
|
nla_nest_cancel(skb, nest);
|
|
return -1;
|
|
}
|
|
|
|
static struct tcf_proto_ops cls_u32_ops __read_mostly = {
|
|
.kind = "u32",
|
|
.classify = u32_classify,
|
|
.init = u32_init,
|
|
.destroy = u32_destroy,
|
|
.get = u32_get,
|
|
.put = u32_put,
|
|
.change = u32_change,
|
|
.delete = u32_delete,
|
|
.walk = u32_walk,
|
|
.dump = u32_dump,
|
|
.owner = THIS_MODULE,
|
|
};
|
|
|
|
static int __init init_u32(void)
|
|
{
|
|
pr_info("u32 classifier\n");
|
|
#ifdef CONFIG_CLS_U32_PERF
|
|
pr_info(" Performance counters on\n");
|
|
#endif
|
|
#ifdef CONFIG_NET_CLS_IND
|
|
pr_info(" input device check on\n");
|
|
#endif
|
|
#ifdef CONFIG_NET_CLS_ACT
|
|
pr_info(" Actions configured\n");
|
|
#endif
|
|
return register_tcf_proto_ops(&cls_u32_ops);
|
|
}
|
|
|
|
static void __exit exit_u32(void)
|
|
{
|
|
unregister_tcf_proto_ops(&cls_u32_ops);
|
|
}
|
|
|
|
module_init(init_u32)
|
|
module_exit(exit_u32)
|
|
MODULE_LICENSE("GPL");
|