1 // SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
2 /* Copyright (C) 2019 Netronome Systems, Inc. */
4 #include <linux/if_ether.h>
5 #include <linux/tc_act/tc_mpls.h>
15 static const char * const action_names
[] = {
16 [TCA_MPLS_ACT_POP
] = "pop",
17 [TCA_MPLS_ACT_PUSH
] = "push",
18 [TCA_MPLS_ACT_MODIFY
] = "modify",
19 [TCA_MPLS_ACT_DEC_TTL
] = "dec_ttl",
22 static void explain(void)
25 "Usage: mpls pop [ protocol MPLS_PROTO ]\n"
26 " mpls push [ protocol MPLS_PROTO ] [ label MPLS_LABEL ] [ tc MPLS_TC ]\n"
27 " [ ttl MPLS_TTL ] [ bos MPLS_BOS ] [CONTROL]\n"
28 " mpls modify [ label MPLS_LABEL ] [ tc MPLS_TC ] [ ttl MPLS_TTL ] [CONTROL]\n"
29 " for pop MPLS_PROTO is next header of packet - e.g. ip or mpls_uc\n"
30 " for push MPLS_PROTO is one of mpls_uc or mpls_mc\n"
31 " with default: mpls_uc\n"
32 " CONTROL := reclassify | pipe | drop | continue | pass |\n"
33 " goto chain <CHAIN_INDEX>\n");
36 static void usage(void)
42 static bool can_modify_mpls_fields(unsigned int action
)
44 return action
== TCA_MPLS_ACT_PUSH
|| action
== TCA_MPLS_ACT_MODIFY
;
47 static bool can_modify_ethtype(unsigned int action
)
49 return action
== TCA_MPLS_ACT_PUSH
|| action
== TCA_MPLS_ACT_POP
;
52 static bool is_valid_label(__u32 label
)
54 return label
<= 0xfffff;
57 static bool check_double_action(unsigned int action
, const char *arg
)
63 "Error: got \"%s\" but action already set to \"%s\"\n",
64 arg
, action_names
[action
]);
69 static int parse_mpls(struct action_util
*a
, int *argc_p
, char ***argv_p
,
70 int tca_id
, struct nlmsghdr
*n
)
72 struct tc_mpls parm
= {};
73 __u32 label
= 0xffffffff;
74 unsigned int action
= 0;
75 char **argv
= *argv_p
;
83 if (matches(*argv
, "mpls") != 0)
89 if (matches(*argv
, "pop") == 0) {
90 if (check_double_action(action
, *argv
))
92 action
= TCA_MPLS_ACT_POP
;
93 } else if (matches(*argv
, "push") == 0) {
94 if (check_double_action(action
, *argv
))
96 action
= TCA_MPLS_ACT_PUSH
;
97 } else if (matches(*argv
, "modify") == 0) {
98 if (check_double_action(action
, *argv
))
100 action
= TCA_MPLS_ACT_MODIFY
;
101 } else if (matches(*argv
, "dec_ttl") == 0) {
102 if (check_double_action(action
, *argv
))
104 action
= TCA_MPLS_ACT_DEC_TTL
;
105 } else if (matches(*argv
, "label") == 0) {
106 if (!can_modify_mpls_fields(action
))
107 invarg("only valid for push/modify", *argv
);
109 if (get_u32(&label
, *argv
, 0) || !is_valid_label(label
))
110 invarg("label must be <=0xFFFFF", *argv
);
111 } else if (matches(*argv
, "tc") == 0) {
112 if (!can_modify_mpls_fields(action
))
113 invarg("only valid for push/modify", *argv
);
115 if (get_u8(&tc
, *argv
, 0) || (tc
& ~0x7))
116 invarg("tc field is 3 bits max", *argv
);
117 } else if (matches(*argv
, "ttl") == 0) {
118 if (!can_modify_mpls_fields(action
))
119 invarg("only valid for push/modify", *argv
);
121 if (get_u8(&ttl
, *argv
, 0) || !ttl
)
122 invarg("ttl must be >0 and <=255", *argv
);
123 } else if (matches(*argv
, "bos") == 0) {
124 if (!can_modify_mpls_fields(action
))
125 invarg("only valid for push/modify", *argv
);
127 if (get_u8(&bos
, *argv
, 0) || (bos
& ~0x1))
128 invarg("bos must be 0 or 1", *argv
);
129 } else if (matches(*argv
, "protocol") == 0) {
130 if (!can_modify_ethtype(action
))
131 invarg("only valid for push/pop", *argv
);
133 if (ll_proto_a2n(&proto
, *argv
))
134 invarg("protocol is invalid", *argv
);
135 } else if (matches(*argv
, "help") == 0) {
145 incomplete_command();
147 parse_action_control_dflt(&argc
, &argv
, &parm
.action
,
151 if (matches(*argv
, "index") == 0) {
153 if (get_u32(&parm
.index
, *argv
, 10))
154 invarg("illegal index", *argv
);
159 if (action
== TCA_MPLS_ACT_PUSH
&& label
== 0xffffffff)
162 if (action
== TCA_MPLS_ACT_PUSH
&& proto
&&
163 proto
!= htons(ETH_P_MPLS_UC
) && proto
!= htons(ETH_P_MPLS_MC
)) {
165 "invalid push protocol \"0x%04x\" - use mpls_(uc|mc)\n",
170 if (action
== TCA_MPLS_ACT_POP
&& !proto
)
173 parm
.m_action
= action
;
174 tail
= addattr_nest(n
, MAX_MSG
, tca_id
| NLA_F_NESTED
);
175 addattr_l(n
, MAX_MSG
, TCA_MPLS_PARMS
, &parm
, sizeof(parm
));
176 if (label
!= 0xffffffff)
177 addattr_l(n
, MAX_MSG
, TCA_MPLS_LABEL
, &label
, sizeof(label
));
179 addattr_l(n
, MAX_MSG
, TCA_MPLS_PROTO
, &proto
, sizeof(proto
));
181 addattr8(n
, MAX_MSG
, TCA_MPLS_TC
, tc
);
183 addattr8(n
, MAX_MSG
, TCA_MPLS_TTL
, ttl
);
185 addattr8(n
, MAX_MSG
, TCA_MPLS_BOS
, bos
);
186 addattr_nest_end(n
, tail
);
193 static int print_mpls(struct action_util
*au
, FILE *f
, struct rtattr
*arg
)
195 struct rtattr
*tb
[TCA_MPLS_MAX
+ 1];
196 struct tc_mpls
*parm
;
203 parse_rtattr_nested(tb
, TCA_MPLS_MAX
, arg
);
205 if (!tb
[TCA_MPLS_PARMS
]) {
206 fprintf(stderr
, "[NULL mpls parameters]\n");
209 parm
= RTA_DATA(tb
[TCA_MPLS_PARMS
]);
211 print_string(PRINT_ANY
, "kind", "%s ", "mpls");
212 print_string(PRINT_ANY
, "mpls_action", " %s",
213 action_names
[parm
->m_action
]);
215 switch (parm
->m_action
) {
216 case TCA_MPLS_ACT_POP
:
217 if (tb
[TCA_MPLS_PROTO
]) {
220 proto
= rta_getattr_u16(tb
[TCA_MPLS_PROTO
]);
221 print_string(PRINT_ANY
, "protocol", " protocol %s",
222 ll_proto_n2a(proto
, b1
, sizeof(b1
)));
225 case TCA_MPLS_ACT_PUSH
:
226 if (tb
[TCA_MPLS_PROTO
]) {
229 proto
= rta_getattr_u16(tb
[TCA_MPLS_PROTO
]);
230 print_string(PRINT_ANY
, "protocol", " protocol %s",
231 ll_proto_n2a(proto
, b1
, sizeof(b1
)));
234 case TCA_MPLS_ACT_MODIFY
:
235 if (tb
[TCA_MPLS_LABEL
]) {
236 val
= rta_getattr_u32(tb
[TCA_MPLS_LABEL
]);
237 print_uint(PRINT_ANY
, "label", " label %u", val
);
239 if (tb
[TCA_MPLS_TC
]) {
240 val
= rta_getattr_u8(tb
[TCA_MPLS_TC
]);
241 print_uint(PRINT_ANY
, "tc", " tc %u", val
);
243 if (tb
[TCA_MPLS_BOS
]) {
244 val
= rta_getattr_u8(tb
[TCA_MPLS_BOS
]);
245 print_uint(PRINT_ANY
, "bos", " bos %u", val
);
247 if (tb
[TCA_MPLS_TTL
]) {
248 val
= rta_getattr_u8(tb
[TCA_MPLS_TTL
]);
249 print_uint(PRINT_ANY
, "ttl", " ttl %u", val
);
253 print_action_control(f
, " ", parm
->action
, "");
256 print_uint(PRINT_ANY
, "index", "\t index %u", parm
->index
);
257 print_int(PRINT_ANY
, "ref", " ref %d", parm
->refcnt
);
258 print_int(PRINT_ANY
, "bind", " bind %d", parm
->bindcnt
);
261 if (tb
[TCA_MPLS_TM
]) {
262 struct tcf_t
*tm
= RTA_DATA(tb
[TCA_MPLS_TM
]);
268 print_string(PRINT_FP
, NULL
, "%s", _SL_
);
273 struct action_util mpls_action_util
= {
275 .parse_aopt
= parse_mpls
,
276 .print_aopt
= print_mpls
,