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net: flower: add support for matching cfm fields

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Add support to the tc flower classifier to match based on fields in CFM
information elements like level and opcode.

tc filter add dev ens6 ingress protocol 802.1q \
	flower vlan_id 698 vlan_ethtype 0x8902 cfm mdl 5 op 46 \
	action drop

Signed-off-by: Zahari Doychev <zdoychev@maxlinear.com>
Reviewed-by: Simon Horman <simon.horman@corigine.com>
Reviewed-by: Ido Schimmel <idosch@nvidia.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Zahari Doychev 2023-06-08 12:56:47 +02:00 committed by Jakub Kicinski
parent d7ad70b5ef
commit 7cfffd5fed
2 changed files with 111 additions and 0 deletions
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9
include/uapi/linux/pkt_cls.h
View File

@ -596,6 +596,8 @@ enum {
TCA_FLOWER_L2_MISS, /* u8 */
TCA_FLOWER_KEY_CFM, /* nested */
__TCA_FLOWER_MAX,
};
@ -704,6 +706,13 @@ enum {
TCA_FLOWER_KEY_FLAGS_FRAG_IS_FIRST = (1 << 1),
};
enum {
TCA_FLOWER_KEY_CFM_OPT_UNSPEC,
TCA_FLOWER_KEY_CFM_MD_LEVEL,
TCA_FLOWER_KEY_CFM_OPCODE,
TCA_FLOWER_KEY_CFM_OPT_MAX,
};
#define TCA_FLOWER_MASK_FLAGS_RANGE (1 << 0) /* Range-based match */
/* Match-all classifier */

102
net/sched/cls_flower.c
View File

@ -11,6 +11,7 @@
#include <linux/rhashtable.h>
#include <linux/workqueue.h>
#include <linux/refcount.h>
#include <linux/bitfield.h>
#include <linux/if_ether.h>
#include <linux/in6.h>
@ -71,6 +72,7 @@ struct fl_flow_key {
struct flow_dissector_key_num_of_vlans num_of_vlans;
struct flow_dissector_key_pppoe pppoe;
struct flow_dissector_key_l2tpv3 l2tpv3;
struct flow_dissector_key_cfm cfm;
} __aligned(BITS_PER_LONG / 8); /* Ensure that we can do comparisons as longs. */
struct fl_flow_mask_range {
@ -725,6 +727,7 @@ static const struct nla_policy fl_policy[TCA_FLOWER_MAX + 1] = {
[TCA_FLOWER_KEY_PPP_PROTO] = { .type = NLA_U16 },
[TCA_FLOWER_KEY_L2TPV3_SID] = { .type = NLA_U32 },
[TCA_FLOWER_L2_MISS] = NLA_POLICY_MAX(NLA_U8, 1),
[TCA_FLOWER_KEY_CFM] = { .type = NLA_NESTED },
};
static const struct nla_policy
@ -773,6 +776,12 @@ mpls_stack_entry_policy[TCA_FLOWER_KEY_MPLS_OPT_LSE_MAX + 1] = {
[TCA_FLOWER_KEY_MPLS_OPT_LSE_LABEL] = { .type = NLA_U32 },
};
static const struct nla_policy cfm_opt_policy[TCA_FLOWER_KEY_CFM_OPT_MAX] = {
[TCA_FLOWER_KEY_CFM_MD_LEVEL] = NLA_POLICY_MAX(NLA_U8,
FLOW_DIS_CFM_MDL_MAX),
[TCA_FLOWER_KEY_CFM_OPCODE] = { .type = NLA_U8 },
};
static void fl_set_key_val(struct nlattr **tb,
void *val, int val_type,
void *mask, int mask_type, int len)
@ -1660,6 +1669,53 @@ static bool is_vlan_key(struct nlattr *tb, __be16 *ethertype,
return false;
}
static void fl_set_key_cfm_md_level(struct nlattr **tb,
struct fl_flow_key *key,
struct fl_flow_key *mask,
struct netlink_ext_ack *extack)
{
u8 level;
if (!tb[TCA_FLOWER_KEY_CFM_MD_LEVEL])
return;
level = nla_get_u8(tb[TCA_FLOWER_KEY_CFM_MD_LEVEL]);
key->cfm.mdl_ver = FIELD_PREP(FLOW_DIS_CFM_MDL_MASK, level);
mask->cfm.mdl_ver = FLOW_DIS_CFM_MDL_MASK;
}
static void fl_set_key_cfm_opcode(struct nlattr **tb,
struct fl_flow_key *key,
struct fl_flow_key *mask,
struct netlink_ext_ack *extack)
{
fl_set_key_val(tb, &key->cfm.opcode, TCA_FLOWER_KEY_CFM_OPCODE,
&mask->cfm.opcode, TCA_FLOWER_UNSPEC,
sizeof(key->cfm.opcode));
}
static int fl_set_key_cfm(struct nlattr **tb,
struct fl_flow_key *key,
struct fl_flow_key *mask,
struct netlink_ext_ack *extack)
{
struct nlattr *nla_cfm_opt[TCA_FLOWER_KEY_CFM_OPT_MAX];
int err;
if (!tb[TCA_FLOWER_KEY_CFM])
return 0;
err = nla_parse_nested(nla_cfm_opt, TCA_FLOWER_KEY_CFM_OPT_MAX,
tb[TCA_FLOWER_KEY_CFM], cfm_opt_policy, extack);
if (err < 0)
return err;
fl_set_key_cfm_opcode(nla_cfm_opt, key, mask, extack);
fl_set_key_cfm_md_level(nla_cfm_opt, key, mask, extack);
return 0;
}
static int fl_set_key(struct net *net, struct nlattr **tb,
struct fl_flow_key *key, struct fl_flow_key *mask,
struct netlink_ext_ack *extack)
@ -1814,6 +1870,10 @@ static int fl_set_key(struct net *net, struct nlattr **tb,
TCA_FLOWER_KEY_L2TPV3_SID,
&mask->l2tpv3.session_id, TCA_FLOWER_UNSPEC,
sizeof(key->l2tpv3.session_id));
} else if (key->basic.n_proto == htons(ETH_P_CFM)) {
ret = fl_set_key_cfm(tb, key, mask, extack);
if (ret)
return ret;
}
if (key->basic.ip_proto == IPPROTO_TCP ||
@ -1996,6 +2056,8 @@ static void fl_init_dissector(struct flow_dissector *dissector,
FLOW_DISSECTOR_KEY_PPPOE, pppoe);
FL_KEY_SET_IF_MASKED(mask, keys, cnt,
FLOW_DISSECTOR_KEY_L2TPV3, l2tpv3);
FL_KEY_SET_IF_MASKED(mask, keys, cnt,
FLOW_DISSECTOR_KEY_CFM, cfm);
skb_flow_dissector_init(dissector, keys, cnt);
}
@ -3029,6 +3091,43 @@ nla_put_failure:
return -EMSGSIZE;
}
static int fl_dump_key_cfm(struct sk_buff *skb,
struct flow_dissector_key_cfm *key,
struct flow_dissector_key_cfm *mask)
{
struct nlattr *opts;
int err;
u8 mdl;
if (!memchr_inv(mask, 0, sizeof(*mask)))
return 0;
opts = nla_nest_start(skb, TCA_FLOWER_KEY_CFM);
if (!opts)
return -EMSGSIZE;
if (FIELD_GET(FLOW_DIS_CFM_MDL_MASK, mask->mdl_ver)) {
mdl = FIELD_GET(FLOW_DIS_CFM_MDL_MASK, key->mdl_ver);
err = nla_put_u8(skb, TCA_FLOWER_KEY_CFM_MD_LEVEL, mdl);
if (err)
goto err_cfm_opts;
}
if (mask->opcode) {
err = nla_put_u8(skb, TCA_FLOWER_KEY_CFM_OPCODE, key->opcode);
if (err)
goto err_cfm_opts;
}
nla_nest_end(skb, opts);
return 0;
err_cfm_opts:
nla_nest_cancel(skb, opts);
return err;
}
static int fl_dump_key_options(struct sk_buff *skb, int enc_opt_type,
struct flow_dissector_key_enc_opts *enc_opts)
{
@ -3316,6 +3415,9 @@ static int fl_dump_key(struct sk_buff *skb, struct net *net,
sizeof(key->hash.hash)))
goto nla_put_failure;
if (fl_dump_key_cfm(skb, &key->cfm, &mask->cfm))
goto nla_put_failure;
return 0;
nla_put_failure: