diff options
Diffstat (limited to 'net/sched/cls_u32.c')
| -rw-r--r-- | net/sched/cls_u32.c | 1075 |
1 files changed, 1075 insertions, 0 deletions
diff --git a/net/sched/cls_u32.c b/net/sched/cls_u32.c new file mode 100644 index 000000000..cab9e9b43 --- /dev/null +++ b/net/sched/cls_u32.c @@ -0,0 +1,1075 @@ +/* + * net/sched/cls_u32.c Ugly (or Universal) 32bit key Packet Classifier. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version + * 2 of the License, or (at your option) any later version. + * + * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> + * + * The filters are packed to hash tables of key nodes + * with a set of 32bit key/mask pairs at every node. + * Nodes reference next level hash tables etc. + * + * This scheme is the best universal classifier I managed to + * invent; it is not super-fast, but it is not slow (provided you + * program it correctly), and general enough. And its relative + * speed grows as the number of rules becomes larger. + * + * It seems that it represents the best middle point between + * speed and manageability both by human and by machine. + * + * It is especially useful for link sharing combined with QoS; + * pure RSVP doesn't need such a general approach and can use + * much simpler (and faster) schemes, sort of cls_rsvp.c. + * + * JHS: We should remove the CONFIG_NET_CLS_IND from here + * eventually when the meta match extension is made available + * + * nfmark match added by Catalin(ux aka Dino) BOIE <catab at umbrella.ro> + */ + +#include <linux/module.h> +#include <linux/slab.h> +#include <linux/types.h> +#include <linux/kernel.h> +#include <linux/string.h> +#include <linux/errno.h> +#include <linux/percpu.h> +#include <linux/rtnetlink.h> +#include <linux/skbuff.h> +#include <linux/bitmap.h> +#include <net/netlink.h> +#include <net/act_api.h> +#include <net/pkt_cls.h> + +struct tc_u_knode { + struct tc_u_knode __rcu *next; + u32 handle; + struct tc_u_hnode __rcu *ht_up; + struct tcf_exts exts; +#ifdef CONFIG_NET_CLS_IND + int ifindex; +#endif + u8 fshift; + struct tcf_result res; + struct tc_u_hnode __rcu *ht_down; +#ifdef CONFIG_CLS_U32_PERF + struct tc_u32_pcnt __percpu *pf; +#endif +#ifdef CONFIG_CLS_U32_MARK + u32 val; + u32 mask; + u32 __percpu *pcpu_success; +#endif + struct tcf_proto *tp; + struct rcu_head rcu; + /* The 'sel' field MUST be the last field in structure to allow for + * tc_u32_keys allocated at end of structure. + */ + struct tc_u32_sel sel; +}; + +struct tc_u_hnode { + struct tc_u_hnode __rcu *next; + u32 handle; + u32 prio; + struct tc_u_common *tp_c; + int refcnt; + unsigned int divisor; + struct rcu_head rcu; + /* The 'ht' field MUST be the last field in structure to allow for + * more entries allocated at end of structure. + */ + struct tc_u_knode __rcu *ht[1]; +}; + +struct tc_u_common { + struct tc_u_hnode __rcu *hlist; + struct Qdisc *q; + int refcnt; + u32 hgenerator; + struct rcu_head rcu; +}; + +static inline unsigned int u32_hash_fold(__be32 key, + const struct tc_u32_sel *sel, + u8 fshift) +{ + unsigned int h = ntohl(key & sel->hmask) >> fshift; + + return h; +} + +static int u32_classify(struct sk_buff *skb, const struct tcf_proto *tp, struct tcf_result *res) +{ + struct { + struct tc_u_knode *knode; + unsigned int off; + } stack[TC_U32_MAXDEPTH]; + + struct tc_u_hnode *ht = rcu_dereference_bh(tp->root); + unsigned int off = skb_network_offset(skb); + struct tc_u_knode *n; + int sdepth = 0; + int off2 = 0; + int sel = 0; +#ifdef CONFIG_CLS_U32_PERF + int j; +#endif + int i, r; + +next_ht: + n = rcu_dereference_bh(ht->ht[sel]); + +next_knode: + if (n) { + struct tc_u32_key *key = n->sel.keys; + +#ifdef CONFIG_CLS_U32_PERF + __this_cpu_inc(n->pf->rcnt); + j = 0; +#endif + +#ifdef CONFIG_CLS_U32_MARK + if ((skb->mark & n->mask) != n->val) { + n = rcu_dereference_bh(n->next); + goto next_knode; + } else { + __this_cpu_inc(*n->pcpu_success); + } +#endif + + for (i = n->sel.nkeys; i > 0; i--, key++) { + int toff = off + key->off + (off2 & key->offmask); + __be32 *data, hdata; + + if (skb_headroom(skb) + toff > INT_MAX) + goto out; + + data = skb_header_pointer(skb, toff, 4, &hdata); + if (!data) + goto out; + if ((*data ^ key->val) & key->mask) { + n = rcu_dereference_bh(n->next); + goto next_knode; + } +#ifdef CONFIG_CLS_U32_PERF + __this_cpu_inc(n->pf->kcnts[j]); + j++; +#endif + } + + ht = rcu_dereference_bh(n->ht_down); + if (!ht) { +check_terminal: + if (n->sel.flags & TC_U32_TERMINAL) { + + *res = n->res; +#ifdef CONFIG_NET_CLS_IND + if (!tcf_match_indev(skb, n->ifindex)) { + n = rcu_dereference_bh(n->next); + goto next_knode; + } +#endif +#ifdef CONFIG_CLS_U32_PERF + __this_cpu_inc(n->pf->rhit); +#endif + r = tcf_exts_exec(skb, &n->exts, res); + if (r < 0) { + n = rcu_dereference_bh(n->next); + goto next_knode; + } + + return r; + } + n = rcu_dereference_bh(n->next); + goto next_knode; + } + + /* PUSH */ + if (sdepth >= TC_U32_MAXDEPTH) + goto deadloop; + stack[sdepth].knode = n; + stack[sdepth].off = off; + sdepth++; + + ht = rcu_dereference_bh(n->ht_down); + sel = 0; + if (ht->divisor) { + __be32 *data, hdata; + + data = skb_header_pointer(skb, off + n->sel.hoff, 4, + &hdata); + if (!data) + goto out; + sel = ht->divisor & u32_hash_fold(*data, &n->sel, + n->fshift); + } + if (!(n->sel.flags & (TC_U32_VAROFFSET | TC_U32_OFFSET | TC_U32_EAT))) + goto next_ht; + + if (n->sel.flags & (TC_U32_OFFSET | TC_U32_VAROFFSET)) { + off2 = n->sel.off + 3; + if (n->sel.flags & TC_U32_VAROFFSET) { + __be16 *data, hdata; + + data = skb_header_pointer(skb, + off + n->sel.offoff, + 2, &hdata); + if (!data) + goto out; + off2 += ntohs(n->sel.offmask & *data) >> + n->sel.offshift; + } + off2 &= ~3; + } + if (n->sel.flags & TC_U32_EAT) { + off += off2; + off2 = 0; + } + + if (off < skb->len) + goto next_ht; + } + + /* POP */ + if (sdepth--) { + n = stack[sdepth].knode; + ht = rcu_dereference_bh(n->ht_up); + off = stack[sdepth].off; + goto check_terminal; + } +out: + return -1; + +deadloop: + net_warn_ratelimited("cls_u32: dead loop\n"); + return -1; +} + +static struct tc_u_hnode * +u32_lookup_ht(struct tc_u_common *tp_c, u32 handle) +{ + struct tc_u_hnode *ht; + + for (ht = rtnl_dereference(tp_c->hlist); + ht; + ht = rtnl_dereference(ht->next)) + if (ht->handle == handle) + break; + + return ht; +} + +static struct tc_u_knode * +u32_lookup_key(struct tc_u_hnode *ht, u32 handle) +{ + unsigned int sel; + struct tc_u_knode *n = NULL; + + sel = TC_U32_HASH(handle); + if (sel > ht->divisor) + goto out; + + for (n = rtnl_dereference(ht->ht[sel]); + n; + n = rtnl_dereference(n->next)) + if (n->handle == handle) + break; +out: + return n; +} + + +static unsigned long u32_get(struct tcf_proto *tp, u32 handle) +{ + struct tc_u_hnode *ht; + struct tc_u_common *tp_c = tp->data; + + if (TC_U32_HTID(handle) == TC_U32_ROOT) + ht = rtnl_dereference(tp->root); + else + ht = u32_lookup_ht(tp_c, TC_U32_HTID(handle)); + + if (!ht) + return 0; + + if (TC_U32_KEY(handle) == 0) + return (unsigned long)ht; + + return (unsigned long)u32_lookup_key(ht, handle); +} + +static u32 gen_new_htid(struct tc_u_common *tp_c) +{ + int i = 0x800; + + /* hgenerator only used inside rtnl lock it is safe to increment + * without read _copy_ update semantics + */ + do { + if (++tp_c->hgenerator == 0x7FF) + tp_c->hgenerator = 1; + } while (--i > 0 && u32_lookup_ht(tp_c, (tp_c->hgenerator|0x800)<<20)); + + return i > 0 ? (tp_c->hgenerator|0x800)<<20 : 0; +} + +static int u32_init(struct tcf_proto *tp) +{ + struct tc_u_hnode *root_ht; + struct tc_u_common *tp_c; + + tp_c = tp->q->u32_node; + + root_ht = kzalloc(sizeof(*root_ht), GFP_KERNEL); + if (root_ht == NULL) + return -ENOBUFS; + + root_ht->divisor = 0; + root_ht->refcnt++; + root_ht->handle = tp_c ? gen_new_htid(tp_c) : 0x80000000; + root_ht->prio = tp->prio; + + if (tp_c == NULL) { + tp_c = kzalloc(sizeof(*tp_c), GFP_KERNEL); + if (tp_c == NULL) { + kfree(root_ht); + return -ENOBUFS; + } + tp_c->q = tp->q; + tp->q->u32_node = tp_c; + } + + tp_c->refcnt++; + RCU_INIT_POINTER(root_ht->next, tp_c->hlist); + rcu_assign_pointer(tp_c->hlist, root_ht); + root_ht->tp_c = tp_c; + + rcu_assign_pointer(tp->root, root_ht); + tp->data = tp_c; + return 0; +} + +static int u32_destroy_key(struct tcf_proto *tp, + struct tc_u_knode *n, + bool free_pf) +{ + tcf_exts_destroy(&n->exts); + if (n->ht_down) + n->ht_down->refcnt--; +#ifdef CONFIG_CLS_U32_PERF + if (free_pf) + free_percpu(n->pf); +#endif +#ifdef CONFIG_CLS_U32_MARK + if (free_pf) + free_percpu(n->pcpu_success); +#endif + kfree(n); + return 0; +} + +/* u32_delete_key_rcu should be called when free'ing a copied + * version of a tc_u_knode obtained from u32_init_knode(). When + * copies are obtained from u32_init_knode() the statistics are + * shared between the old and new copies to allow readers to + * continue to update the statistics during the copy. To support + * this the u32_delete_key_rcu variant does not free the percpu + * statistics. + */ +static void u32_delete_key_rcu(struct rcu_head *rcu) +{ + struct tc_u_knode *key = container_of(rcu, struct tc_u_knode, rcu); + + u32_destroy_key(key->tp, key, false); +} + +/* u32_delete_key_freepf_rcu is the rcu callback variant + * that free's the entire structure including the statistics + * percpu variables. Only use this if the key is not a copy + * returned by u32_init_knode(). See u32_delete_key_rcu() + * for the variant that should be used with keys return from + * u32_init_knode() + */ +static void u32_delete_key_freepf_rcu(struct rcu_head *rcu) +{ + struct tc_u_knode *key = container_of(rcu, struct tc_u_knode, rcu); + + u32_destroy_key(key->tp, key, true); +} + +static int u32_delete_key(struct tcf_proto *tp, struct tc_u_knode *key) +{ + struct tc_u_knode __rcu **kp; + struct tc_u_knode *pkp; + struct tc_u_hnode *ht = rtnl_dereference(key->ht_up); + + if (ht) { + kp = &ht->ht[TC_U32_HASH(key->handle)]; + for (pkp = rtnl_dereference(*kp); pkp; + kp = &pkp->next, pkp = rtnl_dereference(*kp)) { + if (pkp == key) { + RCU_INIT_POINTER(*kp, key->next); + + tcf_unbind_filter(tp, &key->res); + call_rcu(&key->rcu, u32_delete_key_freepf_rcu); + return 0; + } + } + } + WARN_ON(1); + return 0; +} + +static void u32_clear_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht) +{ + struct tc_u_knode *n; + unsigned int h; + + for (h = 0; h <= ht->divisor; h++) { + while ((n = rtnl_dereference(ht->ht[h])) != NULL) { + RCU_INIT_POINTER(ht->ht[h], + 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 bool ht_empty(struct tc_u_hnode *ht) +{ + unsigned int h; + + for (h = 0; h <= ht->divisor; h++) + if (rcu_access_pointer(ht->ht[h])) + return false; + + return true; +} + +static bool u32_destroy(struct tcf_proto *tp, bool force) +{ + struct tc_u_common *tp_c = tp->data; + struct tc_u_hnode *root_ht = rtnl_dereference(tp->root); + + WARN_ON(root_ht == NULL); + + if (!force) { + if (root_ht) { + if (root_ht->refcnt > 1) + return false; + if (root_ht->refcnt == 1) { + if (!ht_empty(root_ht)) + return false; + } + } + } + + 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; + return true; +} + +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, + .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"); |