iv/linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

net/sched: Allow flower to match on GTP options

Browse Source 
Options are as follows: PDU_TYPE:QFI and they refernce to
the fields from the  PDU Session Protocol. PDU Session data
is conveyed in GTP-U Extension Header.

GTP-U Extension Header is described in 3GPP TS 29.281.
PDU Session Protocol is described in 3GPP TS 38.415.

PDU_TYPE -  indicates the type of the PDU Session Information (4 bits)
QFI      -  QoS Flow Identifier (6 bits)

  # ip link add gtp_dev type gtp role sgsn
  # tc qdisc add dev gtp_dev ingress
  # tc filter add dev gtp_dev protocol ip parent ffff: \
      flower \
        enc_key_id 11 \
        gtp_opts 1:8/ff:ff \
      action mirred egress redirect dev eth0

Signed-off-by: Wojciech Drewek <wojciech.drewek@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
This commit is contained in:
Wojciech Drewek 2022-03-04 17:40:45 +01:00 committed by Tony Nguyen
parent d33bd757d3
commit e3acda7ade
4 changed files with 139 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
include/net/gtp.h
View File

@ -58,6 +58,11 @@ struct gtp1u_packet {
struct gtp_ie ie;
} __packed;
struct gtp_pdu_session_info { /* According to 3GPP TS 38.415. */
u8 pdu_type;
u8 qfi;
};
#define GTP1_F_NPDU 0x01
#define GTP1_F_SEQ 0x02
#define GTP1_F_EXTHDR 0x04

4
include/uapi/linux/if_tunnel.h
View File

@ -176,8 +176,10 @@ enum {
#define TUNNEL_VXLAN_OPT __cpu_to_be16(0x1000)
#define TUNNEL_NOCACHE __cpu_to_be16(0x2000)
#define TUNNEL_ERSPAN_OPT __cpu_to_be16(0x4000)
#define TUNNEL_GTP_OPT __cpu_to_be16(0x8000)
#define TUNNEL_OPTIONS_PRESENT \
(TUNNEL_GENEVE_OPT | TUNNEL_VXLAN_OPT | TUNNEL_ERSPAN_OPT)
(TUNNEL_GENEVE_OPT | TUNNEL_VXLAN_OPT | TUNNEL_ERSPAN_OPT | \
TUNNEL_GTP_OPT)
#endif /* _UAPI_IF_TUNNEL_H_ */

15
include/uapi/linux/pkt_cls.h
View File

@ -616,6 +616,10 @@ enum {
* TCA_FLOWER_KEY_ENC_OPT_ERSPAN_
* attributes
*/
TCA_FLOWER_KEY_ENC_OPTS_GTP, /* Nested
* TCA_FLOWER_KEY_ENC_OPT_GTP_
* attributes
*/
__TCA_FLOWER_KEY_ENC_OPTS_MAX,
};
@ -654,6 +658,17 @@ enum {
#define TCA_FLOWER_KEY_ENC_OPT_ERSPAN_MAX \
(__TCA_FLOWER_KEY_ENC_OPT_ERSPAN_MAX - 1)
enum {
TCA_FLOWER_KEY_ENC_OPT_GTP_UNSPEC,
TCA_FLOWER_KEY_ENC_OPT_GTP_PDU_TYPE, /* u8 */
TCA_FLOWER_KEY_ENC_OPT_GTP_QFI, /* u8 */
__TCA_FLOWER_KEY_ENC_OPT_GTP_MAX,
};
#define TCA_FLOWER_KEY_ENC_OPT_GTP_MAX \
(__TCA_FLOWER_KEY_ENC_OPT_GTP_MAX - 1)
enum {
TCA_FLOWER_KEY_MPLS_OPTS_UNSPEC,
TCA_FLOWER_KEY_MPLS_OPTS_LSE,

116
net/sched/cls_flower.c
View File

@ -25,6 +25,7 @@
#include <net/geneve.h>
#include <net/vxlan.h>
#include <net/erspan.h>
#include <net/gtp.h>
#include <net/dst.h>
#include <net/dst_metadata.h>
@ -723,6 +724,7 @@ enc_opts_policy[TCA_FLOWER_KEY_ENC_OPTS_MAX + 1] = {
[TCA_FLOWER_KEY_ENC_OPTS_GENEVE] = { .type = NLA_NESTED },
[TCA_FLOWER_KEY_ENC_OPTS_VXLAN] = { .type = NLA_NESTED },
[TCA_FLOWER_KEY_ENC_OPTS_ERSPAN] = { .type = NLA_NESTED },
[TCA_FLOWER_KEY_ENC_OPTS_GTP] = { .type = NLA_NESTED },
};
static const struct nla_policy
@ -746,6 +748,12 @@ erspan_opt_policy[TCA_FLOWER_KEY_ENC_OPT_ERSPAN_MAX + 1] = {
[TCA_FLOWER_KEY_ENC_OPT_ERSPAN_HWID] = { .type = NLA_U8 },
};
static const struct nla_policy
gtp_opt_policy[TCA_FLOWER_KEY_ENC_OPT_GTP_MAX + 1] = {
[TCA_FLOWER_KEY_ENC_OPT_GTP_PDU_TYPE] = { .type = NLA_U8 },
[TCA_FLOWER_KEY_ENC_OPT_GTP_QFI] = { .type = NLA_U8 },
};
static const struct nla_policy
mpls_stack_entry_policy[TCA_FLOWER_KEY_MPLS_OPT_LSE_MAX + 1] = {
[TCA_FLOWER_KEY_MPLS_OPT_LSE_DEPTH] = { .type = NLA_U8 },
@ -1262,6 +1270,49 @@ static int fl_set_erspan_opt(const struct nlattr *nla, struct fl_flow_key *key,
return sizeof(*md);
}
static int fl_set_gtp_opt(const struct nlattr *nla, struct fl_flow_key *key,
int depth, int option_len,
struct netlink_ext_ack *extack)
{
struct nlattr *tb[TCA_FLOWER_KEY_ENC_OPT_GTP_MAX + 1];
struct gtp_pdu_session_info *sinfo;
u8 len = key->enc_opts.len;
int err;
sinfo = (struct gtp_pdu_session_info *)&key->enc_opts.data[len];
memset(sinfo, 0xff, option_len);
if (!depth)
return sizeof(*sinfo);
if (nla_type(nla) != TCA_FLOWER_KEY_ENC_OPTS_GTP) {
NL_SET_ERR_MSG_MOD(extack, "Non-gtp option type for mask");
return -EINVAL;
}
err = nla_parse_nested(tb, TCA_FLOWER_KEY_ENC_OPT_GTP_MAX, nla,
gtp_opt_policy, extack);
if (err < 0)
return err;
if (!option_len &&
(!tb[TCA_FLOWER_KEY_ENC_OPT_GTP_PDU_TYPE] ||
!tb[TCA_FLOWER_KEY_ENC_OPT_GTP_QFI])) {
NL_SET_ERR_MSG_MOD(extack,
"Missing tunnel key gtp option pdu type or qfi");
return -EINVAL;
}
if (tb[TCA_FLOWER_KEY_ENC_OPT_GTP_PDU_TYPE])
sinfo->pdu_type =
nla_get_u8(tb[TCA_FLOWER_KEY_ENC_OPT_GTP_PDU_TYPE]);
if (tb[TCA_FLOWER_KEY_ENC_OPT_GTP_QFI])
sinfo->qfi = nla_get_u8(tb[TCA_FLOWER_KEY_ENC_OPT_GTP_QFI]);
return sizeof(*sinfo);
}
static int fl_set_enc_opt(struct nlattr **tb, struct fl_flow_key *key,
struct fl_flow_key *mask,
struct netlink_ext_ack *extack)
@ -1386,6 +1437,38 @@ static int fl_set_enc_opt(struct nlattr **tb, struct fl_flow_key *key,
return -EINVAL;
}
break;
case TCA_FLOWER_KEY_ENC_OPTS_GTP:
if (key->enc_opts.dst_opt_type) {
NL_SET_ERR_MSG_MOD(extack,
"Duplicate type for gtp options");
return -EINVAL;
}
option_len = 0;
key->enc_opts.dst_opt_type = TUNNEL_GTP_OPT;
option_len = fl_set_gtp_opt(nla_opt_key, key,
key_depth, option_len,
extack);
if (option_len < 0)
return option_len;
key->enc_opts.len += option_len;
/* At the same time we need to parse through the mask
* in order to verify exact and mask attribute lengths.
*/
mask->enc_opts.dst_opt_type = TUNNEL_GTP_OPT;
option_len = fl_set_gtp_opt(nla_opt_msk, mask,
msk_depth, option_len,
extack);
if (option_len < 0)
return option_len;
mask->enc_opts.len += option_len;
if (key->enc_opts.len != mask->enc_opts.len) {
NL_SET_ERR_MSG_MOD(extack,
"Key and mask miss aligned");
return -EINVAL;
}
break;
default:
NL_SET_ERR_MSG(extack, "Unknown tunnel option type");
return -EINVAL;
@ -2761,6 +2844,34 @@ nla_put_failure:
return -EMSGSIZE;
}
static int fl_dump_key_gtp_opt(struct sk_buff *skb,
struct flow_dissector_key_enc_opts *enc_opts)
{
struct gtp_pdu_session_info *session_info;
struct nlattr *nest;
nest = nla_nest_start_noflag(skb, TCA_FLOWER_KEY_ENC_OPTS_GTP);
if (!nest)
goto nla_put_failure;
session_info = (struct gtp_pdu_session_info *)&enc_opts->data[0];
if (nla_put_u8(skb, TCA_FLOWER_KEY_ENC_OPT_GTP_PDU_TYPE,
session_info->pdu_type))
goto nla_put_failure;
if (nla_put_u8(skb, TCA_FLOWER_KEY_ENC_OPT_GTP_QFI, session_info->qfi))
goto nla_put_failure;
nla_nest_end(skb, nest);
return 0;
nla_put_failure:
nla_nest_cancel(skb, nest);
return -EMSGSIZE;
}
static int fl_dump_key_ct(struct sk_buff *skb,
struct flow_dissector_key_ct *key,
struct flow_dissector_key_ct *mask)
@ -2824,6 +2935,11 @@ static int fl_dump_key_options(struct sk_buff *skb, int enc_opt_type,
if (err)
goto nla_put_failure;
break;
case TUNNEL_GTP_OPT:
err = fl_dump_key_gtp_opt(skb, enc_opts);
if (err)
goto nla_put_failure;
break;
default:
goto nla_put_failure;
}