2 * m_skbmod.c skb modifier action module
4 * This program is free software; you can distribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
9 * Authors: J Hadi Salim (jhs@mojatatu.com)
17 #include <sys/socket.h>
18 #include <netinet/in.h>
19 #include <arpa/inet.h>
21 #include <linux/netdevice.h>
26 #include <linux/tc_act/tc_skbmod.h>
28 static void skbmod_explain(void)
31 "Usage:... skbmod {[set <SETTABLE>] [swap <SWAPABLE>]} [CONTROL] [index INDEX]\n"
32 "where SETTABLE is: [dmac DMAC] [smac SMAC] [etype ETYPE]\n"
33 "where SWAPABLE is: \"mac\" to swap mac addresses\n"
34 "note: \"swap mac\" is done after any outstanding D/SMAC change\n"
35 "\tDMAC := 6 byte Destination MAC address\n"
36 "\tSMAC := optional 6 byte Source MAC address\n"
37 "\tETYPE := optional 16 bit ethertype\n"
38 "\tCONTROL := reclassify | pipe | drop | continue | ok |\n"
39 "\t goto chain <CHAIN_INDEX>\n"
40 "\tINDEX := skbmod index value to use\n");
43 static void skbmod_usage(void)
49 static int parse_skbmod(struct action_util
*a
, int *argc_p
, char ***argv_p
,
50 int tca_id
, struct nlmsghdr
*n
)
53 char **argv
= *argv_p
;
59 __u16 skbmod_etype
= 0;
63 memset(&p
, 0, sizeof(p
));
69 if (matches(*argv
, "skbmod") == 0) {
72 } else if (matches(*argv
, "swap") == 0) {
75 } else if (matches(*argv
, "mac") == 0) {
76 p
.flags
|= SKBMOD_F_SWAPMAC
;
78 } else if (matches(*argv
, "set") == 0) {
81 } else if (matches(*argv
, "etype") == 0) {
83 if (get_u16(&skbmod_etype
, *argv
, 0))
84 invarg("ethertype is invalid", *argv
);
85 fprintf(stderr
, "skbmod etype 0x%x\n", skbmod_etype
);
86 p
.flags
|= SKBMOD_F_ETYPE
;
88 } else if (matches(*argv
, "dmac") == 0) {
91 if (sscanf(daddr
, "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx",
92 dbuf
, dbuf
+ 1, dbuf
+ 2,
93 dbuf
+ 3, dbuf
+ 4, dbuf
+ 5) != 6) {
94 fprintf(stderr
, "Invalid dst mac address %s\n",
98 p
.flags
|= SKBMOD_F_DMAC
;
99 fprintf(stderr
, "dst MAC address <%s>\n", daddr
);
102 } else if (matches(*argv
, "smac") == 0) {
105 if (sscanf(saddr
, "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx",
106 sbuf
, sbuf
+ 1, sbuf
+ 2,
107 sbuf
+ 3, sbuf
+ 4, sbuf
+ 5) != 6) {
108 fprintf(stderr
, "Invalid smac address %s\n",
112 p
.flags
|= SKBMOD_F_SMAC
;
113 fprintf(stderr
, "src MAC address <%s>\n", saddr
);
115 } else if (matches(*argv
, "help") == 0) {
125 parse_action_control_dflt(&argc
, &argv
, &p
.action
, false, TC_ACT_PIPE
);
128 if (matches(*argv
, "index") == 0) {
130 if (get_u32(&p
.index
, *argv
, 0)) {
131 fprintf(stderr
, "skbmod: Illegal \"index\"\n");
141 fprintf(stderr
, "skbmod requires at least one option\n");
145 tail
= addattr_nest(n
, MAX_MSG
, tca_id
);
146 addattr_l(n
, MAX_MSG
, TCA_SKBMOD_PARMS
, &p
, sizeof(p
));
149 addattr_l(n
, MAX_MSG
, TCA_SKBMOD_DMAC
, dbuf
, ETH_ALEN
);
151 addattr16(n
, MAX_MSG
, TCA_SKBMOD_ETYPE
, skbmod_etype
);
153 addattr_l(n
, MAX_MSG
, TCA_SKBMOD_SMAC
, sbuf
, ETH_ALEN
);
155 addattr_nest_end(n
, tail
);
162 static int print_skbmod(struct action_util
*au
, FILE *f
, struct rtattr
*arg
)
165 struct rtattr
*tb
[TCA_SKBMOD_MAX
+ 1];
166 __u16 skbmod_etype
= 0;
167 int has_optional
= 0;
174 parse_rtattr_nested(tb
, TCA_SKBMOD_MAX
, arg
);
176 if (tb
[TCA_SKBMOD_PARMS
] == NULL
) {
177 fprintf(stderr
, "Missing skbmod parameters\n");
181 p
= RTA_DATA(tb
[TCA_SKBMOD_PARMS
]);
183 fprintf(f
, "skbmod ");
184 print_action_control(f
, "", p
->action
, " ");
186 if (tb
[TCA_SKBMOD_ETYPE
]) {
187 skbmod_etype
= rta_getattr_u16(tb
[TCA_SKBMOD_ETYPE
]);
189 fprintf(f
, "set etype 0x%X ", skbmod_etype
);
195 if (tb
[TCA_SKBMOD_DMAC
]) {
197 fprintf(f
, "set dmac %s ",
198 ll_addr_n2a(RTA_DATA(tb
[TCA_SKBMOD_DMAC
]),
199 RTA_PAYLOAD(tb
[TCA_SKBMOD_DMAC
]), 0, b1
,
204 if (tb
[TCA_SKBMOD_SMAC
]) {
206 fprintf(f
, "set smac %s ",
207 ll_addr_n2a(RTA_DATA(tb
[TCA_SKBMOD_SMAC
]),
208 RTA_PAYLOAD(tb
[TCA_SKBMOD_SMAC
]), 0, b2
,
212 if (p
->flags
& SKBMOD_F_SWAPMAC
)
213 fprintf(f
, "swap mac ");
215 fprintf(f
, "\n\t index %u ref %d bind %d", p
->index
, p
->refcnt
,
218 if (tb
[TCA_SKBMOD_TM
]) {
219 struct tcf_t
*tm
= RTA_DATA(tb
[TCA_SKBMOD_TM
]);
230 struct action_util skbmod_action_util
= {
232 .parse_aopt
= parse_skbmod
,
233 .print_aopt
= print_skbmod
,