This patch introduces a flow-based filter. So far, the very essential
packet fields are supported.
This patch is only the first step. There is a lot of potential performance
improvements possible to implement. Also a lot of features are missing
now. They will be addressed in follow-up patches.
Signed-off-by: Jiri Pirko <j...@resnulli.us>
---
v3->v4:
- renamed to "flower" and remove all references to OpenFlow
- removed internal classifier and used skb_flow_dissect instead
v2->v3:
- prepare masted key for faster matching
- use one mask per one cls_of_head as suggested by Thomas Graf
- Thomas Graf suggested to use hash lookup from the very beginning,
so use rthashtable to store masked keys and do lookup in classify op
v1->v2:
- Added note to Kconfig about no relation to other OpenFlow items than
classification suggested by Thomas Graf
- fixed TCA_BASIC_CLASSID c&p typo noticed by Jamal
- avoided union for tp suggested by Jamal
Signed-off-by: Jiri Pirko <j...@resnulli.us>
---
include/uapi/linux/pkt_cls.h | 31 ++
net/sched/Kconfig | 10 +
net/sched/Makefile | 1 +
net/sched/cls_flower.c | 688 +++++++++++++++++++++++++++++++++++++++++++
4 files changed, 730 insertions(+)
create mode 100644 net/sched/cls_flower.c
diff --git a/include/uapi/linux/pkt_cls.h b/include/uapi/linux/pkt_cls.h
index bf08e76..6851602 100644
--- a/include/uapi/linux/pkt_cls.h
+++ b/include/uapi/linux/pkt_cls.h
@@ -404,6 +404,37 @@ enum {
#define TCA_BPF_MAX (__TCA_BPF_MAX - 1)
+/* Flower classifier */
+
+enum {
+ TCA_FLOWER_UNSPEC,
+ TCA_FLOWER_CLASSID,
+ TCA_FLOWER_POLICE,
+ TCA_FLOWER_INDEV,
+ TCA_FLOWER_ACT,
+ TCA_FLOWER_KEY_ETH_DST, /* ETH_ALEN */
+ TCA_FLOWER_KEY_ETH_DST_MASK, /* ETH_ALEN */
+ TCA_FLOWER_KEY_ETH_SRC, /* ETH_ALEN */
+ TCA_FLOWER_KEY_ETH_SRC_MASK, /* ETH_ALEN */
+ TCA_FLOWER_KEY_ETH_TYPE, /* be16 */
+ TCA_FLOWER_KEY_IP_PROTO, /* u8 */
+ TCA_FLOWER_KEY_IPV4_SRC, /* be32 */
+ TCA_FLOWER_KEY_IPV4_SRC_MASK, /* be32 */
+ TCA_FLOWER_KEY_IPV4_DST, /* be32 */
+ TCA_FLOWER_KEY_IPV4_DST_MASK, /* be32 */
+ TCA_FLOWER_KEY_IPV6_SRC, /* struct in6_addr */
+ TCA_FLOWER_KEY_IPV6_SRC_MASK, /* struct in6_addr */
+ TCA_FLOWER_KEY_IPV6_DST, /* struct in6_addr */
+ TCA_FLOWER_KEY_IPV6_DST_MASK, /* struct in6_addr */
+ TCA_FLOWER_KEY_TCP_SRC, /* be16 */
+ TCA_FLOWER_KEY_TCP_DST, /* be16 */
+ TCA_FLOWER_KEY_UDP_SRC, /* be16 */
+ TCA_FLOWER_KEY_UDP_DST, /* be16 */
+ __TCA_FLOWER_MAX,
+};
+
+#define TCA_FLOWER_MAX (__TCA_FLOWER_MAX - 1)
+
/* Extended Matches */
struct tcf_ematch_tree_hdr {
diff --git a/net/sched/Kconfig b/net/sched/Kconfig
index 2274e72..5fd1c2f 100644
--- a/net/sched/Kconfig
+++ b/net/sched/Kconfig
@@ -477,6 +477,16 @@ config NET_CLS_BPF
To compile this code as a module, choose M here: the module will
be called cls_bpf.
+config NET_CLS_FLOWER
+ tristate "Flower classifier"
+ select NET_CLS
+ ---help---
+ If you say Y here, you will be able to classify packets based on
+ a configurable combination of packet keys and masks.
+
+ To compile this code as a module, choose M here: the module will
+ be called cls_flower.
+
config NET_EMATCH
bool "Extended Matches"
select NET_CLS
diff --git a/net/sched/Makefile b/net/sched/Makefile
index 7ca7f4c..690c1689 100644
--- a/net/sched/Makefile
+++ b/net/sched/Makefile
@@ -56,6 +56,7 @@ obj-$(CONFIG_NET_CLS_BASIC) += cls_basic.o
obj-$(CONFIG_NET_CLS_FLOW) += cls_flow.o
obj-$(CONFIG_NET_CLS_CGROUP) += cls_cgroup.o
obj-$(CONFIG_NET_CLS_BPF) += cls_bpf.o
+obj-$(CONFIG_NET_CLS_FLOWER) += cls_flower.o
obj-$(CONFIG_NET_EMATCH) += ematch.o
obj-$(CONFIG_NET_EMATCH_CMP) += em_cmp.o
obj-$(CONFIG_NET_EMATCH_NBYTE) += em_nbyte.o
diff --git a/net/sched/cls_flower.c b/net/sched/cls_flower.c
new file mode 100644
index 0000000..17cc18b
--- /dev/null
+++ b/net/sched/cls_flower.c
@@ -0,0 +1,688 @@
+/*
+ * net/sched/cls_flower.c Flower classifier
+ *
+ * Copyright (c) 2015 Jiri Pirko <j...@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_basic basic;
+ struct flow_dissector_key_eth_addrs eth;
+ union {
+ struct flow_dissector_key_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);
+
+ 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_TCP_SRC] = { .type = NLA_U16 },
+ [TCA_FLOWER_KEY_TCP_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)
+{
+ int err;
+
+ if (tb[TCA_FLOWER_INDEV]) {
+ err = tcf_change_indev(net, tb[TCA_FLOWER_INDEV]);
+ if (err < 0)
+ return err;
+ key->indev_ifindex = err;
+ mask->indev_ifindex = 0xffffffff;
+ }
+
+ 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 (key->basic.n_proto == htons(ETH_P_IP)) {
+ 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 (key->basic.n_proto == htons(ETH_P_IPV6)) {
+ 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_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, TCA_FLOWER_POLICE);
+ 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, TCA_FLOWER_POLICE);
+
+ 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(&fnew->list, &fold->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->basic.n_proto == htons(ETH_P_IP) &&
+ (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->basic.n_proto == htons(ETH_P_IPV6) &&
+ (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 <j...@resnulli.us>");
+MODULE_DESCRIPTION("Flower classifier");
+MODULE_LICENSE("GPL v2");
--
1.9.3
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