![Jamal Hadi Salim](/assets/img/avatar_default.png)
only when user space passes the addresses should we consider their presence Signed-off-by: Jamal Hadi Salim <jhs@mojatatu.com> Acked-by: Jiri Pirko <jiri@resnulli.us> Signed-off-by: David S. Miller <davem@davemloft.net>
698 lines
19 KiB
C
698 lines
19 KiB
C
/*
|
|
* net/sched/cls_flower.c Flower classifier
|
|
*
|
|
* Copyright (c) 2015 Jiri Pirko <jiri@resnulli.us>
|
|
*
|
|
* 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.
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/init.h>
|
|
#include <linux/module.h>
|
|
#include <linux/rhashtable.h>
|
|
|
|
#include <linux/if_ether.h>
|
|
#include <linux/in6.h>
|
|
#include <linux/ip.h>
|
|
|
|
#include <net/sch_generic.h>
|
|
#include <net/pkt_cls.h>
|
|
#include <net/ip.h>
|
|
#include <net/flow_dissector.h>
|
|
|
|
struct fl_flow_key {
|
|
int indev_ifindex;
|
|
struct flow_dissector_key_control control;
|
|
struct flow_dissector_key_basic basic;
|
|
struct flow_dissector_key_eth_addrs eth;
|
|
struct flow_dissector_key_addrs ipaddrs;
|
|
union {
|
|
struct flow_dissector_key_ipv4_addrs ipv4;
|
|
struct flow_dissector_key_ipv6_addrs ipv6;
|
|
};
|
|
struct flow_dissector_key_ports tp;
|
|
} __aligned(BITS_PER_LONG / 8); /* Ensure that we can do comparisons as longs. */
|
|
|
|
struct fl_flow_mask_range {
|
|
unsigned short int start;
|
|
unsigned short int end;
|
|
};
|
|
|
|
struct fl_flow_mask {
|
|
struct fl_flow_key key;
|
|
struct fl_flow_mask_range range;
|
|
struct rcu_head rcu;
|
|
};
|
|
|
|
struct cls_fl_head {
|
|
struct rhashtable ht;
|
|
struct fl_flow_mask mask;
|
|
struct flow_dissector dissector;
|
|
u32 hgen;
|
|
bool mask_assigned;
|
|
struct list_head filters;
|
|
struct rhashtable_params ht_params;
|
|
struct rcu_head rcu;
|
|
};
|
|
|
|
struct cls_fl_filter {
|
|
struct rhash_head ht_node;
|
|
struct fl_flow_key mkey;
|
|
struct tcf_exts exts;
|
|
struct tcf_result res;
|
|
struct fl_flow_key key;
|
|
struct list_head list;
|
|
u32 handle;
|
|
struct rcu_head rcu;
|
|
};
|
|
|
|
static unsigned short int fl_mask_range(const struct fl_flow_mask *mask)
|
|
{
|
|
return mask->range.end - mask->range.start;
|
|
}
|
|
|
|
static void fl_mask_update_range(struct fl_flow_mask *mask)
|
|
{
|
|
const u8 *bytes = (const u8 *) &mask->key;
|
|
size_t size = sizeof(mask->key);
|
|
size_t i, first = 0, last = size - 1;
|
|
|
|
for (i = 0; i < sizeof(mask->key); i++) {
|
|
if (bytes[i]) {
|
|
if (!first && i)
|
|
first = i;
|
|
last = i;
|
|
}
|
|
}
|
|
mask->range.start = rounddown(first, sizeof(long));
|
|
mask->range.end = roundup(last + 1, sizeof(long));
|
|
}
|
|
|
|
static void *fl_key_get_start(struct fl_flow_key *key,
|
|
const struct fl_flow_mask *mask)
|
|
{
|
|
return (u8 *) key + mask->range.start;
|
|
}
|
|
|
|
static void fl_set_masked_key(struct fl_flow_key *mkey, struct fl_flow_key *key,
|
|
struct fl_flow_mask *mask)
|
|
{
|
|
const long *lkey = fl_key_get_start(key, mask);
|
|
const long *lmask = fl_key_get_start(&mask->key, mask);
|
|
long *lmkey = fl_key_get_start(mkey, mask);
|
|
int i;
|
|
|
|
for (i = 0; i < fl_mask_range(mask); i += sizeof(long))
|
|
*lmkey++ = *lkey++ & *lmask++;
|
|
}
|
|
|
|
static void fl_clear_masked_range(struct fl_flow_key *key,
|
|
struct fl_flow_mask *mask)
|
|
{
|
|
memset(fl_key_get_start(key, mask), 0, fl_mask_range(mask));
|
|
}
|
|
|
|
static int fl_classify(struct sk_buff *skb, const struct tcf_proto *tp,
|
|
struct tcf_result *res)
|
|
{
|
|
struct cls_fl_head *head = rcu_dereference_bh(tp->root);
|
|
struct cls_fl_filter *f;
|
|
struct fl_flow_key skb_key;
|
|
struct fl_flow_key skb_mkey;
|
|
|
|
fl_clear_masked_range(&skb_key, &head->mask);
|
|
skb_key.indev_ifindex = skb->skb_iif;
|
|
/* skb_flow_dissect() does not set n_proto in case an unknown protocol,
|
|
* so do it rather here.
|
|
*/
|
|
skb_key.basic.n_proto = skb->protocol;
|
|
skb_flow_dissect(skb, &head->dissector, &skb_key, 0);
|
|
|
|
fl_set_masked_key(&skb_mkey, &skb_key, &head->mask);
|
|
|
|
f = rhashtable_lookup_fast(&head->ht,
|
|
fl_key_get_start(&skb_mkey, &head->mask),
|
|
head->ht_params);
|
|
if (f) {
|
|
*res = f->res;
|
|
return tcf_exts_exec(skb, &f->exts, res);
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
static int fl_init(struct tcf_proto *tp)
|
|
{
|
|
struct cls_fl_head *head;
|
|
|
|
head = kzalloc(sizeof(*head), GFP_KERNEL);
|
|
if (!head)
|
|
return -ENOBUFS;
|
|
|
|
INIT_LIST_HEAD_RCU(&head->filters);
|
|
rcu_assign_pointer(tp->root, head);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void fl_destroy_filter(struct rcu_head *head)
|
|
{
|
|
struct cls_fl_filter *f = container_of(head, struct cls_fl_filter, rcu);
|
|
|
|
tcf_exts_destroy(&f->exts);
|
|
kfree(f);
|
|
}
|
|
|
|
static bool fl_destroy(struct tcf_proto *tp, bool force)
|
|
{
|
|
struct cls_fl_head *head = rtnl_dereference(tp->root);
|
|
struct cls_fl_filter *f, *next;
|
|
|
|
if (!force && !list_empty(&head->filters))
|
|
return false;
|
|
|
|
list_for_each_entry_safe(f, next, &head->filters, list) {
|
|
list_del_rcu(&f->list);
|
|
call_rcu(&f->rcu, fl_destroy_filter);
|
|
}
|
|
RCU_INIT_POINTER(tp->root, NULL);
|
|
if (head->mask_assigned)
|
|
rhashtable_destroy(&head->ht);
|
|
kfree_rcu(head, rcu);
|
|
return true;
|
|
}
|
|
|
|
static unsigned long fl_get(struct tcf_proto *tp, u32 handle)
|
|
{
|
|
struct cls_fl_head *head = rtnl_dereference(tp->root);
|
|
struct cls_fl_filter *f;
|
|
|
|
list_for_each_entry(f, &head->filters, list)
|
|
if (f->handle == handle)
|
|
return (unsigned long) f;
|
|
return 0;
|
|
}
|
|
|
|
static const struct nla_policy fl_policy[TCA_FLOWER_MAX + 1] = {
|
|
[TCA_FLOWER_UNSPEC] = { .type = NLA_UNSPEC },
|
|
[TCA_FLOWER_CLASSID] = { .type = NLA_U32 },
|
|
[TCA_FLOWER_INDEV] = { .type = NLA_STRING,
|
|
.len = IFNAMSIZ },
|
|
[TCA_FLOWER_KEY_ETH_DST] = { .len = ETH_ALEN },
|
|
[TCA_FLOWER_KEY_ETH_DST_MASK] = { .len = ETH_ALEN },
|
|
[TCA_FLOWER_KEY_ETH_SRC] = { .len = ETH_ALEN },
|
|
[TCA_FLOWER_KEY_ETH_SRC_MASK] = { .len = ETH_ALEN },
|
|
[TCA_FLOWER_KEY_ETH_TYPE] = { .type = NLA_U16 },
|
|
[TCA_FLOWER_KEY_IP_PROTO] = { .type = NLA_U8 },
|
|
[TCA_FLOWER_KEY_IPV4_SRC] = { .type = NLA_U32 },
|
|
[TCA_FLOWER_KEY_IPV4_SRC_MASK] = { .type = NLA_U32 },
|
|
[TCA_FLOWER_KEY_IPV4_DST] = { .type = NLA_U32 },
|
|
[TCA_FLOWER_KEY_IPV4_DST_MASK] = { .type = NLA_U32 },
|
|
[TCA_FLOWER_KEY_IPV6_SRC] = { .len = sizeof(struct in6_addr) },
|
|
[TCA_FLOWER_KEY_IPV6_SRC_MASK] = { .len = sizeof(struct in6_addr) },
|
|
[TCA_FLOWER_KEY_IPV6_DST] = { .len = sizeof(struct in6_addr) },
|
|
[TCA_FLOWER_KEY_IPV6_DST_MASK] = { .len = sizeof(struct in6_addr) },
|
|
[TCA_FLOWER_KEY_TCP_SRC] = { .type = NLA_U16 },
|
|
[TCA_FLOWER_KEY_TCP_DST] = { .type = NLA_U16 },
|
|
[TCA_FLOWER_KEY_UDP_SRC] = { .type = NLA_U16 },
|
|
[TCA_FLOWER_KEY_UDP_DST] = { .type = NLA_U16 },
|
|
};
|
|
|
|
static void fl_set_key_val(struct nlattr **tb,
|
|
void *val, int val_type,
|
|
void *mask, int mask_type, int len)
|
|
{
|
|
if (!tb[val_type])
|
|
return;
|
|
memcpy(val, nla_data(tb[val_type]), len);
|
|
if (mask_type == TCA_FLOWER_UNSPEC || !tb[mask_type])
|
|
memset(mask, 0xff, len);
|
|
else
|
|
memcpy(mask, nla_data(tb[mask_type]), len);
|
|
}
|
|
|
|
static int fl_set_key(struct net *net, struct nlattr **tb,
|
|
struct fl_flow_key *key, struct fl_flow_key *mask)
|
|
{
|
|
#ifdef CONFIG_NET_CLS_IND
|
|
if (tb[TCA_FLOWER_INDEV]) {
|
|
int err = tcf_change_indev(net, tb[TCA_FLOWER_INDEV]);
|
|
if (err < 0)
|
|
return err;
|
|
key->indev_ifindex = err;
|
|
mask->indev_ifindex = 0xffffffff;
|
|
}
|
|
#endif
|
|
|
|
fl_set_key_val(tb, key->eth.dst, TCA_FLOWER_KEY_ETH_DST,
|
|
mask->eth.dst, TCA_FLOWER_KEY_ETH_DST_MASK,
|
|
sizeof(key->eth.dst));
|
|
fl_set_key_val(tb, key->eth.src, TCA_FLOWER_KEY_ETH_SRC,
|
|
mask->eth.src, TCA_FLOWER_KEY_ETH_SRC_MASK,
|
|
sizeof(key->eth.src));
|
|
|
|
fl_set_key_val(tb, &key->basic.n_proto, TCA_FLOWER_KEY_ETH_TYPE,
|
|
&mask->basic.n_proto, TCA_FLOWER_UNSPEC,
|
|
sizeof(key->basic.n_proto));
|
|
|
|
if (key->basic.n_proto == htons(ETH_P_IP) ||
|
|
key->basic.n_proto == htons(ETH_P_IPV6)) {
|
|
fl_set_key_val(tb, &key->basic.ip_proto, TCA_FLOWER_KEY_IP_PROTO,
|
|
&mask->basic.ip_proto, TCA_FLOWER_UNSPEC,
|
|
sizeof(key->basic.ip_proto));
|
|
}
|
|
|
|
if (tb[TCA_FLOWER_KEY_IPV4_SRC] || tb[TCA_FLOWER_KEY_IPV4_DST]) {
|
|
key->control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS;
|
|
fl_set_key_val(tb, &key->ipv4.src, TCA_FLOWER_KEY_IPV4_SRC,
|
|
&mask->ipv4.src, TCA_FLOWER_KEY_IPV4_SRC_MASK,
|
|
sizeof(key->ipv4.src));
|
|
fl_set_key_val(tb, &key->ipv4.dst, TCA_FLOWER_KEY_IPV4_DST,
|
|
&mask->ipv4.dst, TCA_FLOWER_KEY_IPV4_DST_MASK,
|
|
sizeof(key->ipv4.dst));
|
|
} else if (tb[TCA_FLOWER_KEY_IPV6_SRC] || tb[TCA_FLOWER_KEY_IPV6_DST]) {
|
|
key->control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
|
|
fl_set_key_val(tb, &key->ipv6.src, TCA_FLOWER_KEY_IPV6_SRC,
|
|
&mask->ipv6.src, TCA_FLOWER_KEY_IPV6_SRC_MASK,
|
|
sizeof(key->ipv6.src));
|
|
fl_set_key_val(tb, &key->ipv6.dst, TCA_FLOWER_KEY_IPV6_DST,
|
|
&mask->ipv6.dst, TCA_FLOWER_KEY_IPV6_DST_MASK,
|
|
sizeof(key->ipv6.dst));
|
|
}
|
|
|
|
if (key->basic.ip_proto == IPPROTO_TCP) {
|
|
fl_set_key_val(tb, &key->tp.src, TCA_FLOWER_KEY_TCP_SRC,
|
|
&mask->tp.src, TCA_FLOWER_UNSPEC,
|
|
sizeof(key->tp.src));
|
|
fl_set_key_val(tb, &key->tp.dst, TCA_FLOWER_KEY_TCP_DST,
|
|
&mask->tp.dst, TCA_FLOWER_UNSPEC,
|
|
sizeof(key->tp.dst));
|
|
} else if (key->basic.ip_proto == IPPROTO_UDP) {
|
|
fl_set_key_val(tb, &key->tp.src, TCA_FLOWER_KEY_UDP_SRC,
|
|
&mask->tp.src, TCA_FLOWER_UNSPEC,
|
|
sizeof(key->tp.src));
|
|
fl_set_key_val(tb, &key->tp.dst, TCA_FLOWER_KEY_UDP_DST,
|
|
&mask->tp.dst, TCA_FLOWER_UNSPEC,
|
|
sizeof(key->tp.dst));
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static bool fl_mask_eq(struct fl_flow_mask *mask1,
|
|
struct fl_flow_mask *mask2)
|
|
{
|
|
const long *lmask1 = fl_key_get_start(&mask1->key, mask1);
|
|
const long *lmask2 = fl_key_get_start(&mask2->key, mask2);
|
|
|
|
return !memcmp(&mask1->range, &mask2->range, sizeof(mask1->range)) &&
|
|
!memcmp(lmask1, lmask2, fl_mask_range(mask1));
|
|
}
|
|
|
|
static const struct rhashtable_params fl_ht_params = {
|
|
.key_offset = offsetof(struct cls_fl_filter, mkey), /* base offset */
|
|
.head_offset = offsetof(struct cls_fl_filter, ht_node),
|
|
.automatic_shrinking = true,
|
|
};
|
|
|
|
static int fl_init_hashtable(struct cls_fl_head *head,
|
|
struct fl_flow_mask *mask)
|
|
{
|
|
head->ht_params = fl_ht_params;
|
|
head->ht_params.key_len = fl_mask_range(mask);
|
|
head->ht_params.key_offset += mask->range.start;
|
|
|
|
return rhashtable_init(&head->ht, &head->ht_params);
|
|
}
|
|
|
|
#define FL_KEY_MEMBER_OFFSET(member) offsetof(struct fl_flow_key, member)
|
|
#define FL_KEY_MEMBER_SIZE(member) (sizeof(((struct fl_flow_key *) 0)->member))
|
|
#define FL_KEY_MEMBER_END_OFFSET(member) \
|
|
(FL_KEY_MEMBER_OFFSET(member) + FL_KEY_MEMBER_SIZE(member))
|
|
|
|
#define FL_KEY_IN_RANGE(mask, member) \
|
|
(FL_KEY_MEMBER_OFFSET(member) <= (mask)->range.end && \
|
|
FL_KEY_MEMBER_END_OFFSET(member) >= (mask)->range.start)
|
|
|
|
#define FL_KEY_SET(keys, cnt, id, member) \
|
|
do { \
|
|
keys[cnt].key_id = id; \
|
|
keys[cnt].offset = FL_KEY_MEMBER_OFFSET(member); \
|
|
cnt++; \
|
|
} while(0);
|
|
|
|
#define FL_KEY_SET_IF_IN_RANGE(mask, keys, cnt, id, member) \
|
|
do { \
|
|
if (FL_KEY_IN_RANGE(mask, member)) \
|
|
FL_KEY_SET(keys, cnt, id, member); \
|
|
} while(0);
|
|
|
|
static void fl_init_dissector(struct cls_fl_head *head,
|
|
struct fl_flow_mask *mask)
|
|
{
|
|
struct flow_dissector_key keys[FLOW_DISSECTOR_KEY_MAX];
|
|
size_t cnt = 0;
|
|
|
|
FL_KEY_SET(keys, cnt, FLOW_DISSECTOR_KEY_CONTROL, control);
|
|
FL_KEY_SET(keys, cnt, FLOW_DISSECTOR_KEY_BASIC, basic);
|
|
FL_KEY_SET_IF_IN_RANGE(mask, keys, cnt,
|
|
FLOW_DISSECTOR_KEY_ETH_ADDRS, eth);
|
|
FL_KEY_SET_IF_IN_RANGE(mask, keys, cnt,
|
|
FLOW_DISSECTOR_KEY_IPV4_ADDRS, ipv4);
|
|
FL_KEY_SET_IF_IN_RANGE(mask, keys, cnt,
|
|
FLOW_DISSECTOR_KEY_IPV6_ADDRS, ipv6);
|
|
FL_KEY_SET_IF_IN_RANGE(mask, keys, cnt,
|
|
FLOW_DISSECTOR_KEY_PORTS, tp);
|
|
|
|
skb_flow_dissector_init(&head->dissector, keys, cnt);
|
|
}
|
|
|
|
static int fl_check_assign_mask(struct cls_fl_head *head,
|
|
struct fl_flow_mask *mask)
|
|
{
|
|
int err;
|
|
|
|
if (head->mask_assigned) {
|
|
if (!fl_mask_eq(&head->mask, mask))
|
|
return -EINVAL;
|
|
else
|
|
return 0;
|
|
}
|
|
|
|
/* Mask is not assigned yet. So assign it and init hashtable
|
|
* according to that.
|
|
*/
|
|
err = fl_init_hashtable(head, mask);
|
|
if (err)
|
|
return err;
|
|
memcpy(&head->mask, mask, sizeof(head->mask));
|
|
head->mask_assigned = true;
|
|
|
|
fl_init_dissector(head, mask);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int fl_set_parms(struct net *net, struct tcf_proto *tp,
|
|
struct cls_fl_filter *f, struct fl_flow_mask *mask,
|
|
unsigned long base, struct nlattr **tb,
|
|
struct nlattr *est, bool ovr)
|
|
{
|
|
struct tcf_exts e;
|
|
int err;
|
|
|
|
tcf_exts_init(&e, TCA_FLOWER_ACT, 0);
|
|
err = tcf_exts_validate(net, tp, tb, est, &e, ovr);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
if (tb[TCA_FLOWER_CLASSID]) {
|
|
f->res.classid = nla_get_u32(tb[TCA_FLOWER_CLASSID]);
|
|
tcf_bind_filter(tp, &f->res, base);
|
|
}
|
|
|
|
err = fl_set_key(net, tb, &f->key, &mask->key);
|
|
if (err)
|
|
goto errout;
|
|
|
|
fl_mask_update_range(mask);
|
|
fl_set_masked_key(&f->mkey, &f->key, mask);
|
|
|
|
tcf_exts_change(tp, &f->exts, &e);
|
|
|
|
return 0;
|
|
errout:
|
|
tcf_exts_destroy(&e);
|
|
return err;
|
|
}
|
|
|
|
static u32 fl_grab_new_handle(struct tcf_proto *tp,
|
|
struct cls_fl_head *head)
|
|
{
|
|
unsigned int i = 0x80000000;
|
|
u32 handle;
|
|
|
|
do {
|
|
if (++head->hgen == 0x7FFFFFFF)
|
|
head->hgen = 1;
|
|
} while (--i > 0 && fl_get(tp, head->hgen));
|
|
|
|
if (unlikely(i == 0)) {
|
|
pr_err("Insufficient number of handles\n");
|
|
handle = 0;
|
|
} else {
|
|
handle = head->hgen;
|
|
}
|
|
|
|
return handle;
|
|
}
|
|
|
|
static int fl_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 cls_fl_head *head = rtnl_dereference(tp->root);
|
|
struct cls_fl_filter *fold = (struct cls_fl_filter *) *arg;
|
|
struct cls_fl_filter *fnew;
|
|
struct nlattr *tb[TCA_FLOWER_MAX + 1];
|
|
struct fl_flow_mask mask = {};
|
|
int err;
|
|
|
|
if (!tca[TCA_OPTIONS])
|
|
return -EINVAL;
|
|
|
|
err = nla_parse_nested(tb, TCA_FLOWER_MAX, tca[TCA_OPTIONS], fl_policy);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
if (fold && handle && fold->handle != handle)
|
|
return -EINVAL;
|
|
|
|
fnew = kzalloc(sizeof(*fnew), GFP_KERNEL);
|
|
if (!fnew)
|
|
return -ENOBUFS;
|
|
|
|
tcf_exts_init(&fnew->exts, TCA_FLOWER_ACT, 0);
|
|
|
|
if (!handle) {
|
|
handle = fl_grab_new_handle(tp, head);
|
|
if (!handle) {
|
|
err = -EINVAL;
|
|
goto errout;
|
|
}
|
|
}
|
|
fnew->handle = handle;
|
|
|
|
err = fl_set_parms(net, tp, fnew, &mask, base, tb, tca[TCA_RATE], ovr);
|
|
if (err)
|
|
goto errout;
|
|
|
|
err = fl_check_assign_mask(head, &mask);
|
|
if (err)
|
|
goto errout;
|
|
|
|
err = rhashtable_insert_fast(&head->ht, &fnew->ht_node,
|
|
head->ht_params);
|
|
if (err)
|
|
goto errout;
|
|
if (fold)
|
|
rhashtable_remove_fast(&head->ht, &fold->ht_node,
|
|
head->ht_params);
|
|
|
|
*arg = (unsigned long) fnew;
|
|
|
|
if (fold) {
|
|
list_replace_rcu(&fold->list, &fnew->list);
|
|
tcf_unbind_filter(tp, &fold->res);
|
|
call_rcu(&fold->rcu, fl_destroy_filter);
|
|
} else {
|
|
list_add_tail_rcu(&fnew->list, &head->filters);
|
|
}
|
|
|
|
return 0;
|
|
|
|
errout:
|
|
kfree(fnew);
|
|
return err;
|
|
}
|
|
|
|
static int fl_delete(struct tcf_proto *tp, unsigned long arg)
|
|
{
|
|
struct cls_fl_head *head = rtnl_dereference(tp->root);
|
|
struct cls_fl_filter *f = (struct cls_fl_filter *) arg;
|
|
|
|
rhashtable_remove_fast(&head->ht, &f->ht_node,
|
|
head->ht_params);
|
|
list_del_rcu(&f->list);
|
|
tcf_unbind_filter(tp, &f->res);
|
|
call_rcu(&f->rcu, fl_destroy_filter);
|
|
return 0;
|
|
}
|
|
|
|
static void fl_walk(struct tcf_proto *tp, struct tcf_walker *arg)
|
|
{
|
|
struct cls_fl_head *head = rtnl_dereference(tp->root);
|
|
struct cls_fl_filter *f;
|
|
|
|
list_for_each_entry_rcu(f, &head->filters, list) {
|
|
if (arg->count < arg->skip)
|
|
goto skip;
|
|
if (arg->fn(tp, (unsigned long) f, arg) < 0) {
|
|
arg->stop = 1;
|
|
break;
|
|
}
|
|
skip:
|
|
arg->count++;
|
|
}
|
|
}
|
|
|
|
static int fl_dump_key_val(struct sk_buff *skb,
|
|
void *val, int val_type,
|
|
void *mask, int mask_type, int len)
|
|
{
|
|
int err;
|
|
|
|
if (!memchr_inv(mask, 0, len))
|
|
return 0;
|
|
err = nla_put(skb, val_type, len, val);
|
|
if (err)
|
|
return err;
|
|
if (mask_type != TCA_FLOWER_UNSPEC) {
|
|
err = nla_put(skb, mask_type, len, mask);
|
|
if (err)
|
|
return err;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int fl_dump(struct net *net, struct tcf_proto *tp, unsigned long fh,
|
|
struct sk_buff *skb, struct tcmsg *t)
|
|
{
|
|
struct cls_fl_head *head = rtnl_dereference(tp->root);
|
|
struct cls_fl_filter *f = (struct cls_fl_filter *) fh;
|
|
struct nlattr *nest;
|
|
struct fl_flow_key *key, *mask;
|
|
|
|
if (!f)
|
|
return skb->len;
|
|
|
|
t->tcm_handle = f->handle;
|
|
|
|
nest = nla_nest_start(skb, TCA_OPTIONS);
|
|
if (!nest)
|
|
goto nla_put_failure;
|
|
|
|
if (f->res.classid &&
|
|
nla_put_u32(skb, TCA_FLOWER_CLASSID, f->res.classid))
|
|
goto nla_put_failure;
|
|
|
|
key = &f->key;
|
|
mask = &head->mask.key;
|
|
|
|
if (mask->indev_ifindex) {
|
|
struct net_device *dev;
|
|
|
|
dev = __dev_get_by_index(net, key->indev_ifindex);
|
|
if (dev && nla_put_string(skb, TCA_FLOWER_INDEV, dev->name))
|
|
goto nla_put_failure;
|
|
}
|
|
|
|
if (fl_dump_key_val(skb, key->eth.dst, TCA_FLOWER_KEY_ETH_DST,
|
|
mask->eth.dst, TCA_FLOWER_KEY_ETH_DST_MASK,
|
|
sizeof(key->eth.dst)) ||
|
|
fl_dump_key_val(skb, key->eth.src, TCA_FLOWER_KEY_ETH_SRC,
|
|
mask->eth.src, TCA_FLOWER_KEY_ETH_SRC_MASK,
|
|
sizeof(key->eth.src)) ||
|
|
fl_dump_key_val(skb, &key->basic.n_proto, TCA_FLOWER_KEY_ETH_TYPE,
|
|
&mask->basic.n_proto, TCA_FLOWER_UNSPEC,
|
|
sizeof(key->basic.n_proto)))
|
|
goto nla_put_failure;
|
|
if ((key->basic.n_proto == htons(ETH_P_IP) ||
|
|
key->basic.n_proto == htons(ETH_P_IPV6)) &&
|
|
fl_dump_key_val(skb, &key->basic.ip_proto, TCA_FLOWER_KEY_IP_PROTO,
|
|
&mask->basic.ip_proto, TCA_FLOWER_UNSPEC,
|
|
sizeof(key->basic.ip_proto)))
|
|
goto nla_put_failure;
|
|
|
|
if (key->control.addr_type == FLOW_DISSECTOR_KEY_IPV4_ADDRS &&
|
|
(fl_dump_key_val(skb, &key->ipv4.src, TCA_FLOWER_KEY_IPV4_SRC,
|
|
&mask->ipv4.src, TCA_FLOWER_KEY_IPV4_SRC_MASK,
|
|
sizeof(key->ipv4.src)) ||
|
|
fl_dump_key_val(skb, &key->ipv4.dst, TCA_FLOWER_KEY_IPV4_DST,
|
|
&mask->ipv4.dst, TCA_FLOWER_KEY_IPV4_DST_MASK,
|
|
sizeof(key->ipv4.dst))))
|
|
goto nla_put_failure;
|
|
else if (key->control.addr_type == FLOW_DISSECTOR_KEY_IPV6_ADDRS &&
|
|
(fl_dump_key_val(skb, &key->ipv6.src, TCA_FLOWER_KEY_IPV6_SRC,
|
|
&mask->ipv6.src, TCA_FLOWER_KEY_IPV6_SRC_MASK,
|
|
sizeof(key->ipv6.src)) ||
|
|
fl_dump_key_val(skb, &key->ipv6.dst, TCA_FLOWER_KEY_IPV6_DST,
|
|
&mask->ipv6.dst, TCA_FLOWER_KEY_IPV6_DST_MASK,
|
|
sizeof(key->ipv6.dst))))
|
|
goto nla_put_failure;
|
|
|
|
if (key->basic.ip_proto == IPPROTO_TCP &&
|
|
(fl_dump_key_val(skb, &key->tp.src, TCA_FLOWER_KEY_TCP_SRC,
|
|
&mask->tp.src, TCA_FLOWER_UNSPEC,
|
|
sizeof(key->tp.src)) ||
|
|
fl_dump_key_val(skb, &key->tp.dst, TCA_FLOWER_KEY_TCP_DST,
|
|
&mask->tp.dst, TCA_FLOWER_UNSPEC,
|
|
sizeof(key->tp.dst))))
|
|
goto nla_put_failure;
|
|
else if (key->basic.ip_proto == IPPROTO_UDP &&
|
|
(fl_dump_key_val(skb, &key->tp.src, TCA_FLOWER_KEY_UDP_SRC,
|
|
&mask->tp.src, TCA_FLOWER_UNSPEC,
|
|
sizeof(key->tp.src)) ||
|
|
fl_dump_key_val(skb, &key->tp.dst, TCA_FLOWER_KEY_UDP_DST,
|
|
&mask->tp.dst, TCA_FLOWER_UNSPEC,
|
|
sizeof(key->tp.dst))))
|
|
goto nla_put_failure;
|
|
|
|
if (tcf_exts_dump(skb, &f->exts))
|
|
goto nla_put_failure;
|
|
|
|
nla_nest_end(skb, nest);
|
|
|
|
if (tcf_exts_dump_stats(skb, &f->exts) < 0)
|
|
goto nla_put_failure;
|
|
|
|
return skb->len;
|
|
|
|
nla_put_failure:
|
|
nla_nest_cancel(skb, nest);
|
|
return -1;
|
|
}
|
|
|
|
static struct tcf_proto_ops cls_fl_ops __read_mostly = {
|
|
.kind = "flower",
|
|
.classify = fl_classify,
|
|
.init = fl_init,
|
|
.destroy = fl_destroy,
|
|
.get = fl_get,
|
|
.change = fl_change,
|
|
.delete = fl_delete,
|
|
.walk = fl_walk,
|
|
.dump = fl_dump,
|
|
.owner = THIS_MODULE,
|
|
};
|
|
|
|
static int __init cls_fl_init(void)
|
|
{
|
|
return register_tcf_proto_ops(&cls_fl_ops);
|
|
}
|
|
|
|
static void __exit cls_fl_exit(void)
|
|
{
|
|
unregister_tcf_proto_ops(&cls_fl_ops);
|
|
}
|
|
|
|
module_init(cls_fl_init);
|
|
module_exit(cls_fl_exit);
|
|
|
|
MODULE_AUTHOR("Jiri Pirko <jiri@resnulli.us>");
|
|
MODULE_DESCRIPTION("Flower classifier");
|
|
MODULE_LICENSE("GPL v2");
|