604 lines
15 KiB
C
604 lines
15 KiB
C
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/* SPDX-License-Identifier: GPL-2.0 */
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <net/act_api.h>
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#include <net/flow_offload.h>
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#include <linux/rtnetlink.h>
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#include <linux/mutex.h>
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#include <linux/rhashtable.h>
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struct flow_rule *flow_rule_alloc(unsigned int num_actions)
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{
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struct flow_rule *rule;
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int i;
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rule = kzalloc(struct_size(rule, action.entries, num_actions),
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GFP_KERNEL);
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if (!rule)
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return NULL;
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rule->action.num_entries = num_actions;
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/* Pre-fill each action hw_stats with DONT_CARE.
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* Caller can override this if it wants stats for a given action.
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*/
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for (i = 0; i < num_actions; i++)
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rule->action.entries[i].hw_stats = FLOW_ACTION_HW_STATS_DONT_CARE;
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return rule;
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}
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EXPORT_SYMBOL(flow_rule_alloc);
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struct flow_offload_action *offload_action_alloc(unsigned int num_actions)
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{
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struct flow_offload_action *fl_action;
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int i;
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fl_action = kzalloc(struct_size(fl_action, action.entries, num_actions),
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GFP_KERNEL);
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if (!fl_action)
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return NULL;
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fl_action->action.num_entries = num_actions;
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/* Pre-fill each action hw_stats with DONT_CARE.
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* Caller can override this if it wants stats for a given action.
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*/
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for (i = 0; i < num_actions; i++)
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fl_action->action.entries[i].hw_stats = FLOW_ACTION_HW_STATS_DONT_CARE;
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return fl_action;
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}
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#define FLOW_DISSECTOR_MATCH(__rule, __type, __out) \
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const struct flow_match *__m = &(__rule)->match; \
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struct flow_dissector *__d = (__m)->dissector; \
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\
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(__out)->key = skb_flow_dissector_target(__d, __type, (__m)->key); \
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(__out)->mask = skb_flow_dissector_target(__d, __type, (__m)->mask); \
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void flow_rule_match_meta(const struct flow_rule *rule,
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struct flow_match_meta *out)
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{
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FLOW_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_META, out);
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}
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EXPORT_SYMBOL(flow_rule_match_meta);
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void flow_rule_match_basic(const struct flow_rule *rule,
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struct flow_match_basic *out)
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{
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FLOW_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_BASIC, out);
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}
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EXPORT_SYMBOL(flow_rule_match_basic);
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void flow_rule_match_control(const struct flow_rule *rule,
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struct flow_match_control *out)
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{
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FLOW_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_CONTROL, out);
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}
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EXPORT_SYMBOL(flow_rule_match_control);
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void flow_rule_match_eth_addrs(const struct flow_rule *rule,
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struct flow_match_eth_addrs *out)
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{
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FLOW_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_ETH_ADDRS, out);
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}
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EXPORT_SYMBOL(flow_rule_match_eth_addrs);
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void flow_rule_match_vlan(const struct flow_rule *rule,
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struct flow_match_vlan *out)
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{
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FLOW_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_VLAN, out);
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}
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EXPORT_SYMBOL(flow_rule_match_vlan);
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void flow_rule_match_cvlan(const struct flow_rule *rule,
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struct flow_match_vlan *out)
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{
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FLOW_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_CVLAN, out);
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}
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EXPORT_SYMBOL(flow_rule_match_cvlan);
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void flow_rule_match_ipv4_addrs(const struct flow_rule *rule,
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struct flow_match_ipv4_addrs *out)
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{
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FLOW_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_IPV4_ADDRS, out);
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}
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EXPORT_SYMBOL(flow_rule_match_ipv4_addrs);
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void flow_rule_match_ipv6_addrs(const struct flow_rule *rule,
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struct flow_match_ipv6_addrs *out)
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{
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FLOW_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_IPV6_ADDRS, out);
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}
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EXPORT_SYMBOL(flow_rule_match_ipv6_addrs);
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void flow_rule_match_ip(const struct flow_rule *rule,
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struct flow_match_ip *out)
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{
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FLOW_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_IP, out);
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}
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EXPORT_SYMBOL(flow_rule_match_ip);
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void flow_rule_match_ports(const struct flow_rule *rule,
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struct flow_match_ports *out)
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{
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FLOW_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_PORTS, out);
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}
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EXPORT_SYMBOL(flow_rule_match_ports);
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void flow_rule_match_tcp(const struct flow_rule *rule,
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struct flow_match_tcp *out)
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{
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FLOW_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_TCP, out);
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}
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EXPORT_SYMBOL(flow_rule_match_tcp);
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void flow_rule_match_icmp(const struct flow_rule *rule,
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struct flow_match_icmp *out)
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{
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FLOW_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_ICMP, out);
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}
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EXPORT_SYMBOL(flow_rule_match_icmp);
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void flow_rule_match_mpls(const struct flow_rule *rule,
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struct flow_match_mpls *out)
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{
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FLOW_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_MPLS, out);
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}
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EXPORT_SYMBOL(flow_rule_match_mpls);
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void flow_rule_match_enc_control(const struct flow_rule *rule,
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struct flow_match_control *out)
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{
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FLOW_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_ENC_CONTROL, out);
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}
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EXPORT_SYMBOL(flow_rule_match_enc_control);
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void flow_rule_match_enc_ipv4_addrs(const struct flow_rule *rule,
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struct flow_match_ipv4_addrs *out)
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{
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FLOW_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_ENC_IPV4_ADDRS, out);
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}
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EXPORT_SYMBOL(flow_rule_match_enc_ipv4_addrs);
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void flow_rule_match_enc_ipv6_addrs(const struct flow_rule *rule,
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struct flow_match_ipv6_addrs *out)
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{
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FLOW_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_ENC_IPV6_ADDRS, out);
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}
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EXPORT_SYMBOL(flow_rule_match_enc_ipv6_addrs);
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void flow_rule_match_enc_ip(const struct flow_rule *rule,
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struct flow_match_ip *out)
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{
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FLOW_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_ENC_IP, out);
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}
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EXPORT_SYMBOL(flow_rule_match_enc_ip);
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void flow_rule_match_enc_ports(const struct flow_rule *rule,
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struct flow_match_ports *out)
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{
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FLOW_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_ENC_PORTS, out);
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}
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EXPORT_SYMBOL(flow_rule_match_enc_ports);
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void flow_rule_match_enc_keyid(const struct flow_rule *rule,
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struct flow_match_enc_keyid *out)
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{
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FLOW_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_ENC_KEYID, out);
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}
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EXPORT_SYMBOL(flow_rule_match_enc_keyid);
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void flow_rule_match_enc_opts(const struct flow_rule *rule,
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struct flow_match_enc_opts *out)
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{
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FLOW_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_ENC_OPTS, out);
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}
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EXPORT_SYMBOL(flow_rule_match_enc_opts);
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struct flow_action_cookie *flow_action_cookie_create(void *data,
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unsigned int len,
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gfp_t gfp)
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{
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struct flow_action_cookie *cookie;
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cookie = kmalloc(sizeof(*cookie) + len, gfp);
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if (!cookie)
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return NULL;
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cookie->cookie_len = len;
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memcpy(cookie->cookie, data, len);
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return cookie;
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}
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EXPORT_SYMBOL(flow_action_cookie_create);
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void flow_action_cookie_destroy(struct flow_action_cookie *cookie)
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{
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kfree(cookie);
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}
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EXPORT_SYMBOL(flow_action_cookie_destroy);
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void flow_rule_match_ct(const struct flow_rule *rule,
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struct flow_match_ct *out)
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{
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FLOW_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_CT, out);
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}
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EXPORT_SYMBOL(flow_rule_match_ct);
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struct flow_block_cb *flow_block_cb_alloc(flow_setup_cb_t *cb,
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void *cb_ident, void *cb_priv,
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void (*release)(void *cb_priv))
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{
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struct flow_block_cb *block_cb;
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block_cb = kzalloc(sizeof(*block_cb), GFP_KERNEL);
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if (!block_cb)
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return ERR_PTR(-ENOMEM);
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block_cb->cb = cb;
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block_cb->cb_ident = cb_ident;
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block_cb->cb_priv = cb_priv;
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block_cb->release = release;
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return block_cb;
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}
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EXPORT_SYMBOL(flow_block_cb_alloc);
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void flow_block_cb_free(struct flow_block_cb *block_cb)
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{
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if (block_cb->release)
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block_cb->release(block_cb->cb_priv);
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kfree(block_cb);
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}
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EXPORT_SYMBOL(flow_block_cb_free);
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struct flow_block_cb *flow_block_cb_lookup(struct flow_block *block,
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flow_setup_cb_t *cb, void *cb_ident)
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{
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struct flow_block_cb *block_cb;
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list_for_each_entry(block_cb, &block->cb_list, list) {
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if (block_cb->cb == cb &&
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block_cb->cb_ident == cb_ident)
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return block_cb;
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}
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return NULL;
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}
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EXPORT_SYMBOL(flow_block_cb_lookup);
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void *flow_block_cb_priv(struct flow_block_cb *block_cb)
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{
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return block_cb->cb_priv;
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}
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EXPORT_SYMBOL(flow_block_cb_priv);
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void flow_block_cb_incref(struct flow_block_cb *block_cb)
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{
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block_cb->refcnt++;
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}
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EXPORT_SYMBOL(flow_block_cb_incref);
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unsigned int flow_block_cb_decref(struct flow_block_cb *block_cb)
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{
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return --block_cb->refcnt;
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}
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EXPORT_SYMBOL(flow_block_cb_decref);
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bool flow_block_cb_is_busy(flow_setup_cb_t *cb, void *cb_ident,
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struct list_head *driver_block_list)
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{
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struct flow_block_cb *block_cb;
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list_for_each_entry(block_cb, driver_block_list, driver_list) {
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if (block_cb->cb == cb &&
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block_cb->cb_ident == cb_ident)
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return true;
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}
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return false;
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}
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EXPORT_SYMBOL(flow_block_cb_is_busy);
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int flow_block_cb_setup_simple(struct flow_block_offload *f,
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struct list_head *driver_block_list,
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flow_setup_cb_t *cb,
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void *cb_ident, void *cb_priv,
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bool ingress_only)
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{
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struct flow_block_cb *block_cb;
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if (ingress_only &&
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f->binder_type != FLOW_BLOCK_BINDER_TYPE_CLSACT_INGRESS)
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return -EOPNOTSUPP;
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f->driver_block_list = driver_block_list;
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switch (f->command) {
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case FLOW_BLOCK_BIND:
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if (flow_block_cb_is_busy(cb, cb_ident, driver_block_list))
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return -EBUSY;
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block_cb = flow_block_cb_alloc(cb, cb_ident, cb_priv, NULL);
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if (IS_ERR(block_cb))
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return PTR_ERR(block_cb);
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flow_block_cb_add(block_cb, f);
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list_add_tail(&block_cb->driver_list, driver_block_list);
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return 0;
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case FLOW_BLOCK_UNBIND:
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block_cb = flow_block_cb_lookup(f->block, cb, cb_ident);
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if (!block_cb)
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return -ENOENT;
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flow_block_cb_remove(block_cb, f);
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list_del(&block_cb->driver_list);
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return 0;
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default:
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return -EOPNOTSUPP;
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}
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}
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EXPORT_SYMBOL(flow_block_cb_setup_simple);
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static DEFINE_MUTEX(flow_indr_block_lock);
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static LIST_HEAD(flow_block_indr_list);
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static LIST_HEAD(flow_block_indr_dev_list);
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static LIST_HEAD(flow_indir_dev_list);
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struct flow_indr_dev {
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struct list_head list;
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flow_indr_block_bind_cb_t *cb;
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void *cb_priv;
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refcount_t refcnt;
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};
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static struct flow_indr_dev *flow_indr_dev_alloc(flow_indr_block_bind_cb_t *cb,
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void *cb_priv)
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{
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struct flow_indr_dev *indr_dev;
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indr_dev = kmalloc(sizeof(*indr_dev), GFP_KERNEL);
|
||
|
|
if (!indr_dev)
|
||
|
|
return NULL;
|
||
|
|
|
||
|
|
indr_dev->cb = cb;
|
||
|
|
indr_dev->cb_priv = cb_priv;
|
||
|
|
refcount_set(&indr_dev->refcnt, 1);
|
||
|
|
|
||
|
|
return indr_dev;
|
||
|
|
}
|
||
|
|
|
||
|
|
struct flow_indir_dev_info {
|
||
|
|
void *data;
|
||
|
|
struct net_device *dev;
|
||
|
|
struct Qdisc *sch;
|
||
|
|
enum tc_setup_type type;
|
||
|
|
void (*cleanup)(struct flow_block_cb *block_cb);
|
||
|
|
struct list_head list;
|
||
|
|
enum flow_block_command command;
|
||
|
|
enum flow_block_binder_type binder_type;
|
||
|
|
struct list_head *cb_list;
|
||
|
|
};
|
||
|
|
|
||
|
|
static void existing_qdiscs_register(flow_indr_block_bind_cb_t *cb, void *cb_priv)
|
||
|
|
{
|
||
|
|
struct flow_block_offload bo;
|
||
|
|
struct flow_indir_dev_info *cur;
|
||
|
|
|
||
|
|
list_for_each_entry(cur, &flow_indir_dev_list, list) {
|
||
|
|
memset(&bo, 0, sizeof(bo));
|
||
|
|
bo.command = cur->command;
|
||
|
|
bo.binder_type = cur->binder_type;
|
||
|
|
INIT_LIST_HEAD(&bo.cb_list);
|
||
|
|
cb(cur->dev, cur->sch, cb_priv, cur->type, &bo, cur->data, cur->cleanup);
|
||
|
|
list_splice(&bo.cb_list, cur->cb_list);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
int flow_indr_dev_register(flow_indr_block_bind_cb_t *cb, void *cb_priv)
|
||
|
|
{
|
||
|
|
struct flow_indr_dev *indr_dev;
|
||
|
|
|
||
|
|
mutex_lock(&flow_indr_block_lock);
|
||
|
|
list_for_each_entry(indr_dev, &flow_block_indr_dev_list, list) {
|
||
|
|
if (indr_dev->cb == cb &&
|
||
|
|
indr_dev->cb_priv == cb_priv) {
|
||
|
|
refcount_inc(&indr_dev->refcnt);
|
||
|
|
mutex_unlock(&flow_indr_block_lock);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
indr_dev = flow_indr_dev_alloc(cb, cb_priv);
|
||
|
|
if (!indr_dev) {
|
||
|
|
mutex_unlock(&flow_indr_block_lock);
|
||
|
|
return -ENOMEM;
|
||
|
|
}
|
||
|
|
|
||
|
|
list_add(&indr_dev->list, &flow_block_indr_dev_list);
|
||
|
|
existing_qdiscs_register(cb, cb_priv);
|
||
|
|
mutex_unlock(&flow_indr_block_lock);
|
||
|
|
|
||
|
|
tcf_action_reoffload_cb(cb, cb_priv, true);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL(flow_indr_dev_register);
|
||
|
|
|
||
|
|
static void __flow_block_indr_cleanup(void (*release)(void *cb_priv),
|
||
|
|
void *cb_priv,
|
||
|
|
struct list_head *cleanup_list)
|
||
|
|
{
|
||
|
|
struct flow_block_cb *this, *next;
|
||
|
|
|
||
|
|
list_for_each_entry_safe(this, next, &flow_block_indr_list, indr.list) {
|
||
|
|
if (this->release == release &&
|
||
|
|
this->indr.cb_priv == cb_priv)
|
||
|
|
list_move(&this->indr.list, cleanup_list);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
static void flow_block_indr_notify(struct list_head *cleanup_list)
|
||
|
|
{
|
||
|
|
struct flow_block_cb *this, *next;
|
||
|
|
|
||
|
|
list_for_each_entry_safe(this, next, cleanup_list, indr.list) {
|
||
|
|
list_del(&this->indr.list);
|
||
|
|
this->indr.cleanup(this);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
void flow_indr_dev_unregister(flow_indr_block_bind_cb_t *cb, void *cb_priv,
|
||
|
|
void (*release)(void *cb_priv))
|
||
|
|
{
|
||
|
|
struct flow_indr_dev *this, *next, *indr_dev = NULL;
|
||
|
|
LIST_HEAD(cleanup_list);
|
||
|
|
|
||
|
|
mutex_lock(&flow_indr_block_lock);
|
||
|
|
list_for_each_entry_safe(this, next, &flow_block_indr_dev_list, list) {
|
||
|
|
if (this->cb == cb &&
|
||
|
|
this->cb_priv == cb_priv &&
|
||
|
|
refcount_dec_and_test(&this->refcnt)) {
|
||
|
|
indr_dev = this;
|
||
|
|
list_del(&indr_dev->list);
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if (!indr_dev) {
|
||
|
|
mutex_unlock(&flow_indr_block_lock);
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
__flow_block_indr_cleanup(release, cb_priv, &cleanup_list);
|
||
|
|
mutex_unlock(&flow_indr_block_lock);
|
||
|
|
|
||
|
|
tcf_action_reoffload_cb(cb, cb_priv, false);
|
||
|
|
flow_block_indr_notify(&cleanup_list);
|
||
|
|
kfree(indr_dev);
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL(flow_indr_dev_unregister);
|
||
|
|
|
||
|
|
static void flow_block_indr_init(struct flow_block_cb *flow_block,
|
||
|
|
struct flow_block_offload *bo,
|
||
|
|
struct net_device *dev, struct Qdisc *sch, void *data,
|
||
|
|
void *cb_priv,
|
||
|
|
void (*cleanup)(struct flow_block_cb *block_cb))
|
||
|
|
{
|
||
|
|
flow_block->indr.binder_type = bo->binder_type;
|
||
|
|
flow_block->indr.data = data;
|
||
|
|
flow_block->indr.cb_priv = cb_priv;
|
||
|
|
flow_block->indr.dev = dev;
|
||
|
|
flow_block->indr.sch = sch;
|
||
|
|
flow_block->indr.cleanup = cleanup;
|
||
|
|
}
|
||
|
|
|
||
|
|
struct flow_block_cb *flow_indr_block_cb_alloc(flow_setup_cb_t *cb,
|
||
|
|
void *cb_ident, void *cb_priv,
|
||
|
|
void (*release)(void *cb_priv),
|
||
|
|
struct flow_block_offload *bo,
|
||
|
|
struct net_device *dev,
|
||
|
|
struct Qdisc *sch, void *data,
|
||
|
|
void *indr_cb_priv,
|
||
|
|
void (*cleanup)(struct flow_block_cb *block_cb))
|
||
|
|
{
|
||
|
|
struct flow_block_cb *block_cb;
|
||
|
|
|
||
|
|
block_cb = flow_block_cb_alloc(cb, cb_ident, cb_priv, release);
|
||
|
|
if (IS_ERR(block_cb))
|
||
|
|
goto out;
|
||
|
|
|
||
|
|
flow_block_indr_init(block_cb, bo, dev, sch, data, indr_cb_priv, cleanup);
|
||
|
|
list_add(&block_cb->indr.list, &flow_block_indr_list);
|
||
|
|
|
||
|
|
out:
|
||
|
|
return block_cb;
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL(flow_indr_block_cb_alloc);
|
||
|
|
|
||
|
|
static struct flow_indir_dev_info *find_indir_dev(void *data)
|
||
|
|
{
|
||
|
|
struct flow_indir_dev_info *cur;
|
||
|
|
|
||
|
|
list_for_each_entry(cur, &flow_indir_dev_list, list) {
|
||
|
|
if (cur->data == data)
|
||
|
|
return cur;
|
||
|
|
}
|
||
|
|
return NULL;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int indir_dev_add(void *data, struct net_device *dev, struct Qdisc *sch,
|
||
|
|
enum tc_setup_type type, void (*cleanup)(struct flow_block_cb *block_cb),
|
||
|
|
struct flow_block_offload *bo)
|
||
|
|
{
|
||
|
|
struct flow_indir_dev_info *info;
|
||
|
|
|
||
|
|
info = find_indir_dev(data);
|
||
|
|
if (info)
|
||
|
|
return -EEXIST;
|
||
|
|
|
||
|
|
info = kzalloc(sizeof(*info), GFP_KERNEL);
|
||
|
|
if (!info)
|
||
|
|
return -ENOMEM;
|
||
|
|
|
||
|
|
info->data = data;
|
||
|
|
info->dev = dev;
|
||
|
|
info->sch = sch;
|
||
|
|
info->type = type;
|
||
|
|
info->cleanup = cleanup;
|
||
|
|
info->command = bo->command;
|
||
|
|
info->binder_type = bo->binder_type;
|
||
|
|
info->cb_list = bo->cb_list_head;
|
||
|
|
|
||
|
|
list_add(&info->list, &flow_indir_dev_list);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int indir_dev_remove(void *data)
|
||
|
|
{
|
||
|
|
struct flow_indir_dev_info *info;
|
||
|
|
|
||
|
|
info = find_indir_dev(data);
|
||
|
|
if (!info)
|
||
|
|
return -ENOENT;
|
||
|
|
|
||
|
|
list_del(&info->list);
|
||
|
|
|
||
|
|
kfree(info);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
int flow_indr_dev_setup_offload(struct net_device *dev, struct Qdisc *sch,
|
||
|
|
enum tc_setup_type type, void *data,
|
||
|
|
struct flow_block_offload *bo,
|
||
|
|
void (*cleanup)(struct flow_block_cb *block_cb))
|
||
|
|
{
|
||
|
|
struct flow_indr_dev *this;
|
||
|
|
u32 count = 0;
|
||
|
|
int err;
|
||
|
|
|
||
|
|
mutex_lock(&flow_indr_block_lock);
|
||
|
|
if (bo) {
|
||
|
|
if (bo->command == FLOW_BLOCK_BIND)
|
||
|
|
indir_dev_add(data, dev, sch, type, cleanup, bo);
|
||
|
|
else if (bo->command == FLOW_BLOCK_UNBIND)
|
||
|
|
indir_dev_remove(data);
|
||
|
|
}
|
||
|
|
|
||
|
|
list_for_each_entry(this, &flow_block_indr_dev_list, list) {
|
||
|
|
err = this->cb(dev, sch, this->cb_priv, type, bo, data, cleanup);
|
||
|
|
if (!err)
|
||
|
|
count++;
|
||
|
|
}
|
||
|
|
|
||
|
|
mutex_unlock(&flow_indr_block_lock);
|
||
|
|
|
||
|
|
return (bo && list_empty(&bo->cb_list)) ? -EOPNOTSUPP : count;
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL(flow_indr_dev_setup_offload);
|
||
|
|
|
||
|
|
bool flow_indr_dev_exists(void)
|
||
|
|
{
|
||
|
|
return !list_empty(&flow_block_indr_dev_list);
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL(flow_indr_dev_exists);
|