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Message-Id: <20240415125000.12846-3-wojciech.drewek@intel.com>
Date: Mon, 15 Apr 2024 14:50:00 +0200
From: Wojciech Drewek <wojciech.drewek@...el.com>
To: netdev@...r.kernel.org
Cc: dsahern@...il.com,
stephen@...workplumber.org
Subject: [PATCH iproute2-next v2 2/2] f_flower: implement pfcp opts
From: Michal Swiatkowski <michal.swiatkowski@...ux.intel.com>
Allow adding tc filter for PFCP header.
Add support for parsing TCA_FLOWER_KEY_ENC_OPTS_PFCP.
Options are as follows: TYPE:SEID.
TYPE is a 8-bit value represented in hex and can be 1
for session header and 0 for node header. In PFCP packet
this is S flag in header.
SEID is a 64-bit session id value represented in hex.
This patch enables adding hardware filters using PFCP fields, see [1].
[1] https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next.git/commit/?id=d823265dd45bbf14bd67aa476057108feb4143ce
Signed-off-by: Michal Swiatkowski <michal.swiatkowski@...ux.intel.com>
Signed-off-by: Wojciech Drewek <wojciech.drewek@...el.com>
---
v2: improve pfcp_opts man description
---
include/libnetlink.h | 6 ++
include/uapi/linux/pkt_cls.h | 14 ++++
man/man8/tc-flower.8 | 11 +++
tc/f_flower.c | 126 +++++++++++++++++++++++++++++++++++
4 files changed, 157 insertions(+)
diff --git a/include/libnetlink.h b/include/libnetlink.h
index 35a9bb57d685..30f0c2d22d49 100644
--- a/include/libnetlink.h
+++ b/include/libnetlink.h
@@ -274,6 +274,12 @@ static inline __u64 rta_getattr_uint(const struct rtattr *rta)
}
return -1ULL;
}
+
+static inline __be64 rta_getattr_be64(const struct rtattr *rta)
+{
+ return htobe64(rta_getattr_u64(rta));
+}
+
static inline __s32 rta_getattr_s32(const struct rtattr *rta)
{
return *(__s32 *)RTA_DATA(rta);
diff --git a/include/uapi/linux/pkt_cls.h b/include/uapi/linux/pkt_cls.h
index ea277039f89d..229fc925ec3a 100644
--- a/include/uapi/linux/pkt_cls.h
+++ b/include/uapi/linux/pkt_cls.h
@@ -587,6 +587,10 @@ enum {
* TCA_FLOWER_KEY_ENC_OPT_GTP_
* attributes
*/
+ TCA_FLOWER_KEY_ENC_OPTS_PFCP, /* Nested
+ * TCA_FLOWER_KEY_ENC_IPT_PFCP
+ * attributes
+ */
__TCA_FLOWER_KEY_ENC_OPTS_MAX,
};
@@ -636,6 +640,16 @@ enum {
#define TCA_FLOWER_KEY_ENC_OPT_GTP_MAX \
(__TCA_FLOWER_KEY_ENC_OPT_GTP_MAX - 1)
+enum {
+ TCA_FLOWER_KEY_ENC_OPT_PFCP_UNSPEC,
+ TCA_FLOWER_KEY_ENC_OPT_PFCP_TYPE, /* u8 */
+ TCA_FLOWER_KEY_ENC_OPT_PFCP_SEID, /* be64 */
+ __TCA_FLOWER_KEY_ENC_OPT_PFCP_MAX,
+};
+
+#define TCA_FLOWER_KEY_ENC_OPT_PFCP_MAX \
+ (__TCA_FLOWER_KEY_ENC_OPT_PFCP_MAX - 1)
+
enum {
TCA_FLOWER_KEY_MPLS_OPTS_UNSPEC,
TCA_FLOWER_KEY_MPLS_OPTS_LSE,
diff --git a/man/man8/tc-flower.8 b/man/man8/tc-flower.8
index 832458138c74..6b56640503d5 100644
--- a/man/man8/tc-flower.8
+++ b/man/man8/tc-flower.8
@@ -97,6 +97,8 @@ flower \- flow based traffic control filter
.B erspan_opts
|
.B gtp_opts
+|
+.B pfcp_opts
}
.IR OPTIONS " | "
.BR ip_flags
@@ -453,6 +455,8 @@ Match the connection zone, and can be masked.
.BI erspan_opts " OPTIONS"
.TQ
.BI gtp_opts " OPTIONS"
+.TQ
+.BI pfcp_opts " OPTIONS"
Match on IP tunnel metadata. Key id
.I NUMBER
is a 32 bit tunnel key id (e.g. VNI for VXLAN tunnel).
@@ -494,6 +498,13 @@ doesn't support multiple options, and it consists of a key followed by a slash
and corresponding mask. If the mask is missing, \fBtc\fR assumes a full-length
match. The option can be described in the form PDU_TYPE:QFI/PDU_TYPE_MASK:QFI_MASK
where both PDU_TYPE and QFI are represented as a 8bit hexadecimal values.
+pfcp_opts
+.I OPTIONS
+does not support multiple options. It consists of a key followed by a slash
+and corresponding mask. If the mask is missing, \fBtc\fR assumes a full-length
+match. The option can be described in the form TYPE:SEID/TYPE_MASK:SEID_MASK
+where TYPE is represented as a 8bit number, SEID is represented by 64bit. Both
+TYPE and SEID are provided in hex.
.TP
.BI ip_flags " IP_FLAGS"
.I IP_FLAGS
diff --git a/tc/f_flower.c b/tc/f_flower.c
index 53188f1cd87a..bc918b4bd3ff 100644
--- a/tc/f_flower.c
+++ b/tc/f_flower.c
@@ -91,6 +91,7 @@ static void explain(void)
" vxlan_opts MASKED-OPTIONS |\n"
" erspan_opts MASKED-OPTIONS |\n"
" gtp_opts MASKED-OPTIONS |\n"
+ " pfcp_opts MASKED-OPTIONS |\n"
" ip_flags IP-FLAGS |\n"
" l2_miss L2_MISS |\n"
" enc_dst_port [ port_number ] |\n"
@@ -1152,6 +1153,58 @@ static int flower_parse_gtp_opt(char *str, struct nlmsghdr *n)
return 0;
}
+static int flower_parse_pfcp_opt(char *str, struct nlmsghdr *n)
+{
+ struct rtattr *nest;
+ char *token;
+ int i, err;
+
+ nest = addattr_nest(n, MAX_MSG,
+ TCA_FLOWER_KEY_ENC_OPTS_PFCP | NLA_F_NESTED);
+
+ i = 1;
+ token = strsep(&str, ":");
+ while (token) {
+ switch (i) {
+ case TCA_FLOWER_KEY_ENC_OPT_PFCP_TYPE:
+ {
+ __u8 opt_type;
+
+ if (!strlen(token))
+ break;
+ err = get_u8(&opt_type, token, 16);
+ if (err)
+ return err;
+
+ addattr8(n, MAX_MSG, i, opt_type);
+ break;
+ }
+ case TCA_FLOWER_KEY_ENC_OPT_PFCP_SEID:
+ {
+ __be64 opt_seid;;
+
+ if (!strlen(token))
+ break;
+ err = get_be64(&opt_seid, token, 16);
+ if (err)
+ return err;
+
+ addattr64(n, MAX_MSG, i, opt_seid);
+ break;
+ }
+ default:
+ fprintf(stderr, "Unknown \"pfcp_opts\" type\n");
+ return -1;
+ }
+
+ token = strsep(&str, ":");
+ i++;
+ }
+ addattr_nest_end(n, nest);
+
+ return 0;
+}
+
static int flower_parse_geneve_opts(char *str, struct nlmsghdr *n)
{
char *token;
@@ -1370,6 +1423,44 @@ static int flower_parse_enc_opts_gtp(char *str, struct nlmsghdr *n)
return 0;
}
+static int flower_parse_enc_opts_pfcp(char *str, struct nlmsghdr *n)
+{
+ char key[XATTR_SIZE_MAX], mask[XATTR_SIZE_MAX];
+ struct rtattr *nest;
+ char *slash;
+ int err;
+
+
+ slash = strchr(str, '/');
+ if (slash) {
+ *slash++ = '\0';
+ if (strlen(slash) > XATTR_SIZE_MAX)
+ return -1;
+ strcpy(mask, slash);
+ } else {
+ strcpy(mask, "ff:ffffffffffffffff");
+ }
+
+ if (strlen(str) > XATTR_SIZE_MAX)
+ return -1;
+ strcpy(key, str);
+
+ nest = addattr_nest(n, MAX_MSG, TCA_FLOWER_KEY_ENC_OPTS | NLA_F_NESTED);
+ err = flower_parse_pfcp_opt(key, n);
+ if (err)
+ return err;
+ addattr_nest_end(n, nest);
+
+ nest = addattr_nest(n, MAX_MSG,
+ TCA_FLOWER_KEY_ENC_OPTS_MASK | NLA_F_NESTED);
+ err = flower_parse_pfcp_opt(mask, n);
+ if (err)
+ return err;
+ addattr_nest_end(n, nest);
+
+ return 0;
+}
+
static int flower_parse_mpls_lse(int *argc_p, char ***argv_p,
struct nlmsghdr *nlh)
{
@@ -2150,6 +2241,13 @@ static int flower_parse_opt(struct filter_util *qu, char *handle,
fprintf(stderr, "Illegal \"gtp_opts\"\n");
return -1;
}
+ } else if (!strcmp(*argv, "pfcp_opts")) {
+ NEXT_ARG();
+ ret = flower_parse_enc_opts_pfcp(*argv, n);
+ if (ret < 0) {
+ fprintf(stderr, "Illegal \"pfcp_opts\"\n");
+ return -1;
+ }
} else if (matches(*argv, "action") == 0) {
NEXT_ARG();
ret = parse_action(&argc, &argv, TCA_FLOWER_ACT, n);
@@ -2646,6 +2744,22 @@ static void flower_print_gtp_opts(const char *name, struct rtattr *attr,
snprintf(strbuf, len, "%02x:%02x", pdu_type, qfi);
}
+static void flower_print_pfcp_opts(const char *name, struct rtattr *attr,
+ char *strbuf, int len)
+{
+ struct rtattr *tb[TCA_FLOWER_KEY_ENC_OPT_PFCP_MAX + 1];
+ struct rtattr *i = RTA_DATA(attr);
+ int rem = RTA_PAYLOAD(attr);
+ __be64 seid;
+ __u8 type;
+
+ parse_rtattr(tb, TCA_FLOWER_KEY_ENC_OPT_PFCP_MAX, i, rem);
+ type = rta_getattr_u8(tb[TCA_FLOWER_KEY_ENC_OPT_PFCP_TYPE]);
+ seid = rta_getattr_be64(tb[TCA_FLOWER_KEY_ENC_OPT_PFCP_SEID]);
+
+ snprintf(strbuf, len, "%02x:%llx", type, seid);
+}
+
static void __attribute__((format(printf, 2, 0)))
flower_print_enc_parts(const char *name, const char *namefrm,
struct rtattr *attr, char *key, char *mask)
@@ -2738,6 +2852,18 @@ static void flower_print_enc_opts(const char *name, struct rtattr *attr,
flower_print_enc_parts(name, " gtp_opts %s", attr, key,
msk);
+ } else if (key_tb[TCA_FLOWER_KEY_ENC_OPTS_PFCP]) {
+ flower_print_pfcp_opts("pfcp_opt_key",
+ key_tb[TCA_FLOWER_KEY_ENC_OPTS_PFCP],
+ key, len);
+
+ if (msk_tb[TCA_FLOWER_KEY_ENC_OPTS_PFCP])
+ flower_print_pfcp_opts("pfcp_opt_mask",
+ msk_tb[TCA_FLOWER_KEY_ENC_OPTS_PFCP],
+ msk, len);
+
+ flower_print_enc_parts(name, " pfcp_opts %s", attr, key,
+ msk);
}
free(msk);
--
2.40.1
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