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Message-Id: <20220211175506.7903-1-marcin.szycik@linux.intel.com>
Date: Fri, 11 Feb 2022 18:55:06 +0100
From: Marcin Szycik <marcin.szycik@...ux.intel.com>
To: netdev@...r.kernel.org
Cc: michal.swiatkowski@...ux.intel.com, wojciech.drewek@...el.com,
davem@...emloft.net, kuba@...nel.org, pablo@...filter.org,
laforge@...monks.org, osmocom-net-gprs@...ts.osmocom.org,
jiri@...nulli.us
Subject: [RFC PATCH net-next v5 3/6] net/sched: Allow flower to match on GTP options
From: Wojciech Drewek <wojciech.drewek@...el.com>
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@...el.com>
---
include/net/gtp.h | 5 ++
include/uapi/linux/if_tunnel.h | 4 +-
include/uapi/linux/pkt_cls.h | 15 +++++
net/sched/cls_flower.c | 116 +++++++++++++++++++++++++++++++++
4 files changed, 139 insertions(+), 1 deletion(-)
diff --git a/include/net/gtp.h b/include/net/gtp.h
index 0e12c37f2958..23c2aaae8a42 100644
--- a/include/net/gtp.h
+++ b/include/net/gtp.h
@@ -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
diff --git a/include/uapi/linux/if_tunnel.h b/include/uapi/linux/if_tunnel.h
index 7d9105533c7b..102119628ff5 100644
--- a/include/uapi/linux/if_tunnel.h
+++ b/include/uapi/linux/if_tunnel.h
@@ -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_ */
diff --git a/include/uapi/linux/pkt_cls.h b/include/uapi/linux/pkt_cls.h
index ee38b35c3f57..404f97fb239c 100644
--- a/include/uapi/linux/pkt_cls.h
+++ b/include/uapi/linux/pkt_cls.h
@@ -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,
diff --git a/net/sched/cls_flower.c b/net/sched/cls_flower.c
index 1a9b1f140f9e..c80fc49c0da1 100644
--- a/net/sched/cls_flower.c
+++ b/net/sched/cls_flower.c
@@ -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 @@ static int fl_dump_key_erspan_opt(struct sk_buff *skb,
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;
}
--
2.31.1
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