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ca697cee4c
mirror_iproute2/ip/link_gre.c
Matteo Croce 8589eb4efd treewide: refactor help messages 
Every tool in the iproute2 package have one or more function to show
an help message to the user. Some of these functions print the help
line by line with a series of printf call, e.g. ip/xfrm_state.c does
60 fprintf calls.
If we group all the calls to a single one and just concatenate strings,
we save a lot of libc calls and thus object size. The size difference
of the compiled binaries calculated with bloat-o-meter is:

        ip/ip:
        add/remove: 0/0 grow/shrink: 5/15 up/down: 103/-4796 (-4693)
        Total: Before=672591, After=667898, chg -0.70%
        ip/rtmon:
        add/remove: 0/0 grow/shrink: 0/1 up/down: 0/-54 (-54)
        Total: Before=48879, After=48825, chg -0.11%
        tc/tc:
        add/remove: 0/2 grow/shrink: 31/10 up/down: 882/-6133 (-5251)
        Total: Before=351912, After=346661, chg -1.49%
        bridge/bridge:
        add/remove: 0/0 grow/shrink: 0/1 up/down: 0/-459 (-459)
        Total: Before=70502, After=70043, chg -0.65%
        misc/lnstat:
        add/remove: 0/1 grow/shrink: 1/0 up/down: 48/-486 (-438)
        Total: Before=9960, After=9522, chg -4.40%
        tipc/tipc:
        add/remove: 0/0 grow/shrink: 1/1 up/down: 18/-62 (-44)
        Total: Before=79182, After=79138, chg -0.06%

While at it, indent some strings which were starting at column 0,
and use tabs where possible, to have a consistent style across helps.

Signed-off-by: Matteo Croce <mcroce@redhat.com>
Signed-off-by: David Ahern <dsahern@gmail.com>
2019-05-20 14:35:07 -07:00

572 lines
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/*
* link_gre.c gre driver module
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*
* Authors: Herbert Xu <herbert@gondor.apana.org.au>
*
*/
#include <string.h>
#include <net/if.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <linux/ip.h>
#include <linux/if_tunnel.h>
#include "rt_names.h"
#include "utils.h"
#include "ip_common.h"
#include "tunnel.h"
static void gre_print_help(struct link_util *lu, int argc, char **argv, FILE *f)
{
fprintf(f,
"Usage: ... %-9s [ remote ADDR ]\n"
" [ local ADDR ]\n"
" [ [no][i|o]seq ]\n"
" [ [i|o]key KEY | no[i|o]key ]\n"
" [ [no][i|o]csum ]\n"
" [ ttl TTL ]\n"
" [ tos TOS ]\n"
" [ [no]pmtudisc ]\n"
" [ [no]ignore-df ]\n"
" [ dev PHYS_DEV ]\n"
" [ fwmark MARK ]\n"
" [ external ]\n"
" [ noencap ]\n"
" [ encap { fou | gue | none } ]\n"
" [ encap-sport PORT ]\n"
" [ encap-dport PORT ]\n"
" [ [no]encap-csum ]\n"
" [ [no]encap-csum6 ]\n"
" [ [no]encap-remcsum ]\n"
" [ erspan_ver version ]\n"
" [ erspan IDX ]\n"
" [ erspan_dir { ingress | egress } ]\n"
" [ erspan_hwid hwid ]\n"
"\n"
"Where: ADDR := { IP_ADDRESS | any }\n"
" TOS := { NUMBER | inherit }\n"
" TTL := { 1..255 | inherit }\n"
" KEY := { DOTTED_QUAD | NUMBER }\n"
" MARK := { 0x0..0xffffffff }\n",
lu->id);
}
static int gre_parse_opt(struct link_util *lu, int argc, char **argv,
struct nlmsghdr *n)
{
struct ifinfomsg *ifi = NLMSG_DATA(n);
struct {
struct nlmsghdr n;
struct ifinfomsg i;
} req = {
.n.nlmsg_len = NLMSG_LENGTH(sizeof(*ifi)),
.n.nlmsg_flags = NLM_F_REQUEST,
.n.nlmsg_type = RTM_GETLINK,
.i.ifi_family = preferred_family,
.i.ifi_index = ifi->ifi_index,
};
struct nlmsghdr *answer;
struct rtattr *tb[IFLA_MAX + 1];
struct rtattr *linkinfo[IFLA_INFO_MAX+1];
struct rtattr *greinfo[IFLA_GRE_MAX + 1];
int len;
__u16 iflags = 0;
__u16 oflags = 0;
__be32 ikey = 0;
__be32 okey = 0;
inet_prefix saddr, daddr;
__u8 pmtudisc = 1;
__u8 ignore_df = 0;
__u8 tos = 0;
__u8 ttl = 0;
__u32 link = 0;
__u16 encaptype = 0;
__u16 encapflags = 0;
__u16 encapsport = 0;
__u16 encapdport = 0;
__u8 metadata = 0;
__u32 fwmark = 0;
__u32 erspan_idx = 0;
__u8 erspan_ver = 0;
__u8 erspan_dir = 0;
__u16 erspan_hwid = 0;
inet_prefix_reset(&saddr);
inet_prefix_reset(&daddr);
if (!(n->nlmsg_flags & NLM_F_CREATE)) {
const struct rtattr *rta;
if (rtnl_talk(&rth, &req.n, &answer) < 0) {
get_failed:
fprintf(stderr,
"Failed to get existing tunnel info.\n");
return -1;
}
len = answer->nlmsg_len;
len -= NLMSG_LENGTH(sizeof(*ifi));
if (len < 0)
goto get_failed;
parse_rtattr(tb, IFLA_MAX, IFLA_RTA(NLMSG_DATA(answer)), len);
if (!tb[IFLA_LINKINFO])
goto get_failed;
parse_rtattr_nested(linkinfo, IFLA_INFO_MAX, tb[IFLA_LINKINFO]);
if (!linkinfo[IFLA_INFO_DATA])
goto get_failed;
parse_rtattr_nested(greinfo, IFLA_GRE_MAX,
linkinfo[IFLA_INFO_DATA]);
rta = greinfo[IFLA_GRE_LOCAL];
if (rta && get_addr_rta(&saddr, rta, AF_INET))
goto get_failed;
rta = greinfo[IFLA_GRE_REMOTE];
if (rta && get_addr_rta(&daddr, rta, AF_INET))
goto get_failed;
if (greinfo[IFLA_GRE_IKEY])
ikey = rta_getattr_u32(greinfo[IFLA_GRE_IKEY]);
if (greinfo[IFLA_GRE_OKEY])
okey = rta_getattr_u32(greinfo[IFLA_GRE_OKEY]);
if (greinfo[IFLA_GRE_IFLAGS])
iflags = rta_getattr_u16(greinfo[IFLA_GRE_IFLAGS]);
if (greinfo[IFLA_GRE_OFLAGS])
oflags = rta_getattr_u16(greinfo[IFLA_GRE_OFLAGS]);
if (greinfo[IFLA_GRE_PMTUDISC])
pmtudisc = rta_getattr_u8(
greinfo[IFLA_GRE_PMTUDISC]);
if (greinfo[IFLA_GRE_IGNORE_DF])
ignore_df =
!!rta_getattr_u8(greinfo[IFLA_GRE_IGNORE_DF]);
if (greinfo[IFLA_GRE_TOS])
tos = rta_getattr_u8(greinfo[IFLA_GRE_TOS]);
if (greinfo[IFLA_GRE_TTL])
ttl = rta_getattr_u8(greinfo[IFLA_GRE_TTL]);
if (greinfo[IFLA_GRE_LINK])
link = rta_getattr_u32(greinfo[IFLA_GRE_LINK]);
if (greinfo[IFLA_GRE_ENCAP_TYPE])
encaptype = rta_getattr_u16(greinfo[IFLA_GRE_ENCAP_TYPE]);
if (greinfo[IFLA_GRE_ENCAP_FLAGS])
encapflags = rta_getattr_u16(greinfo[IFLA_GRE_ENCAP_FLAGS]);
if (greinfo[IFLA_GRE_ENCAP_SPORT])
encapsport = rta_getattr_u16(greinfo[IFLA_GRE_ENCAP_SPORT]);
if (greinfo[IFLA_GRE_ENCAP_DPORT])
encapdport = rta_getattr_u16(greinfo[IFLA_GRE_ENCAP_DPORT]);
if (greinfo[IFLA_GRE_COLLECT_METADATA])
metadata = 1;
if (greinfo[IFLA_GRE_FWMARK])
fwmark = rta_getattr_u32(greinfo[IFLA_GRE_FWMARK]);
if (greinfo[IFLA_GRE_ERSPAN_INDEX])
erspan_idx = rta_getattr_u32(greinfo[IFLA_GRE_ERSPAN_INDEX]);
if (greinfo[IFLA_GRE_ERSPAN_VER])
erspan_ver = rta_getattr_u8(greinfo[IFLA_GRE_ERSPAN_VER]);
if (greinfo[IFLA_GRE_ERSPAN_DIR])
erspan_dir = rta_getattr_u8(greinfo[IFLA_GRE_ERSPAN_DIR]);
if (greinfo[IFLA_GRE_ERSPAN_HWID])
erspan_hwid = rta_getattr_u16(greinfo[IFLA_GRE_ERSPAN_HWID]);
free(answer);
}
while (argc > 0) {
if (!matches(*argv, "key")) {
NEXT_ARG();
iflags |= GRE_KEY;
oflags |= GRE_KEY;
ikey = okey = tnl_parse_key("key", *argv);
} else if (!matches(*argv, "nokey")) {
iflags &= ~GRE_KEY;
oflags &= ~GRE_KEY;
ikey = okey = 0;
} else if (!matches(*argv, "ikey")) {
NEXT_ARG();
iflags |= GRE_KEY;
ikey = tnl_parse_key("ikey", *argv);
} else if (!matches(*argv, "noikey")) {
iflags &= ~GRE_KEY;
ikey = 0;
} else if (!matches(*argv, "okey")) {
NEXT_ARG();
oflags |= GRE_KEY;
okey = tnl_parse_key("okey", *argv);
} else if (!matches(*argv, "nookey")) {
oflags &= ~GRE_KEY;
okey = 0;
} else if (!matches(*argv, "seq")) {
iflags |= GRE_SEQ;
oflags |= GRE_SEQ;
} else if (!matches(*argv, "noseq")) {
iflags &= ~GRE_SEQ;
oflags &= ~GRE_SEQ;
} else if (!matches(*argv, "iseq")) {
iflags |= GRE_SEQ;
} else if (!matches(*argv, "noiseq")) {
iflags &= ~GRE_SEQ;
} else if (!matches(*argv, "oseq")) {
oflags |= GRE_SEQ;
} else if (!matches(*argv, "nooseq")) {
oflags &= ~GRE_SEQ;
} else if (!matches(*argv, "csum")) {
iflags |= GRE_CSUM;
oflags |= GRE_CSUM;
} else if (!matches(*argv, "nocsum")) {
iflags &= ~GRE_CSUM;
oflags &= ~GRE_CSUM;
} else if (!matches(*argv, "icsum")) {
iflags |= GRE_CSUM;
} else if (!matches(*argv, "noicsum")) {
iflags &= ~GRE_CSUM;
} else if (!matches(*argv, "ocsum")) {
oflags |= GRE_CSUM;
} else if (!matches(*argv, "noocsum")) {
oflags &= ~GRE_CSUM;
} else if (!matches(*argv, "nopmtudisc")) {
pmtudisc = 0;
} else if (!matches(*argv, "pmtudisc")) {
pmtudisc = 1;
} else if (!matches(*argv, "remote")) {
NEXT_ARG();
get_addr(&daddr, *argv, AF_INET);
} else if (!matches(*argv, "local")) {
NEXT_ARG();
get_addr(&saddr, *argv, AF_INET);
} else if (!matches(*argv, "dev")) {
NEXT_ARG();
link = ll_name_to_index(*argv);
if (!link)
exit(nodev(*argv));
} else if (!matches(*argv, "ttl") ||
!matches(*argv, "hoplimit") ||
!matches(*argv, "hlim")) {
NEXT_ARG();
if (strcmp(*argv, "inherit") != 0) {
if (get_u8(&ttl, *argv, 0))
invarg("invalid TTL\n", *argv);
} else
ttl = 0;
} else if (!matches(*argv, "tos") ||
!matches(*argv, "tclass") ||
!matches(*argv, "dsfield")) {
__u32 uval;
NEXT_ARG();
if (strcmp(*argv, "inherit") != 0) {
if (rtnl_dsfield_a2n(&uval, *argv))
invarg("bad TOS value", *argv);
tos = uval;
} else
tos = 1;
} else if (strcmp(*argv, "noencap") == 0) {
encaptype = TUNNEL_ENCAP_NONE;
} else if (strcmp(*argv, "encap") == 0) {
NEXT_ARG();
if (strcmp(*argv, "fou") == 0)
encaptype = TUNNEL_ENCAP_FOU;
else if (strcmp(*argv, "gue") == 0)
encaptype = TUNNEL_ENCAP_GUE;
else if (strcmp(*argv, "none") == 0)
encaptype = TUNNEL_ENCAP_NONE;
else
invarg("Invalid encap type.", *argv);
} else if (strcmp(*argv, "encap-sport") == 0) {
NEXT_ARG();
if (strcmp(*argv, "auto") == 0)
encapsport = 0;
else if (get_u16(&encapsport, *argv, 0))
invarg("Invalid source port.", *argv);
} else if (strcmp(*argv, "encap-dport") == 0) {
NEXT_ARG();
if (get_u16(&encapdport, *argv, 0))
invarg("Invalid destination port.", *argv);
} else if (strcmp(*argv, "encap-csum") == 0) {
encapflags |= TUNNEL_ENCAP_FLAG_CSUM;
} else if (strcmp(*argv, "noencap-csum") == 0) {
encapflags &= ~TUNNEL_ENCAP_FLAG_CSUM;
} else if (strcmp(*argv, "encap-udp6-csum") == 0) {
encapflags |= TUNNEL_ENCAP_FLAG_CSUM6;
} else if (strcmp(*argv, "noencap-udp6-csum") == 0) {
encapflags &= ~TUNNEL_ENCAP_FLAG_CSUM6;
} else if (strcmp(*argv, "encap-remcsum") == 0) {
encapflags |= TUNNEL_ENCAP_FLAG_REMCSUM;
} else if (strcmp(*argv, "noencap-remcsum") == 0) {
encapflags &= ~TUNNEL_ENCAP_FLAG_REMCSUM;
} else if (strcmp(*argv, "external") == 0) {
metadata = 1;
} else if (strcmp(*argv, "ignore-df") == 0) {
ignore_df = 1;
} else if (strcmp(*argv, "noignore-df") == 0) {
/*
*only the lsb is significant, use 2 for presence
*/
ignore_df = 2;
} else if (strcmp(*argv, "fwmark") == 0) {
NEXT_ARG();
if (get_u32(&fwmark, *argv, 0))
invarg("invalid fwmark\n", *argv);
} else if (strcmp(*argv, "erspan") == 0) {
NEXT_ARG();
if (get_u32(&erspan_idx, *argv, 0))
invarg("invalid erspan index\n", *argv);
if (erspan_idx & ~((1<<20) - 1) || erspan_idx == 0)
invarg("erspan index must be > 0 and <= 20-bit\n", *argv);
} else if (strcmp(*argv, "erspan_ver") == 0) {
NEXT_ARG();
if (get_u8(&erspan_ver, *argv, 0))
invarg("invalid erspan version\n", *argv);
if (erspan_ver != 1 && erspan_ver != 2)
invarg("erspan version must be 1 or 2\n", *argv);
} else if (strcmp(*argv, "erspan_dir") == 0) {
NEXT_ARG();
if (matches(*argv, "ingress") == 0)
erspan_dir = 0;
else if (matches(*argv, "egress") == 0)
erspan_dir = 1;
else
invarg("Invalid erspan direction.", *argv);
} else if (strcmp(*argv, "erspan_hwid") == 0) {
NEXT_ARG();
if (get_u16(&erspan_hwid, *argv, 0))
invarg("invalid erspan hwid\n", *argv);
} else {
gre_print_help(lu, argc, argv, stderr);
return -1;
}
argc--; argv++;
}
if (is_addrtype_inet_multi(&daddr)) {
if (!ikey) {
ikey = daddr.data[0];
iflags |= GRE_KEY;
}
if (!okey) {
okey = daddr.data[0];
oflags |= GRE_KEY;
}
if (!is_addrtype_inet_not_unspec(&saddr)) {
fprintf(stderr,
"A broadcast tunnel requires a source address.\n");
return -1;
}
}
if (metadata) {
addattr_l(n, 1024, IFLA_GRE_COLLECT_METADATA, NULL, 0);
return 0;
}
addattr32(n, 1024, IFLA_GRE_IKEY, ikey);
addattr32(n, 1024, IFLA_GRE_OKEY, okey);
addattr_l(n, 1024, IFLA_GRE_IFLAGS, &iflags, 2);
addattr_l(n, 1024, IFLA_GRE_OFLAGS, &oflags, 2);
if (is_addrtype_inet_not_unspec(&saddr))
addattr_l(n, 1024, IFLA_GRE_LOCAL, saddr.data, saddr.bytelen);
if (is_addrtype_inet_not_unspec(&daddr))
addattr_l(n, 1024, IFLA_GRE_REMOTE, daddr.data, daddr.bytelen);
addattr_l(n, 1024, IFLA_GRE_PMTUDISC, &pmtudisc, 1);
if (ignore_df)
addattr8(n, 1024, IFLA_GRE_IGNORE_DF, ignore_df & 1);
addattr_l(n, 1024, IFLA_GRE_TOS, &tos, 1);
if (link)
addattr32(n, 1024, IFLA_GRE_LINK, link);
addattr_l(n, 1024, IFLA_GRE_TTL, &ttl, 1);
addattr32(n, 1024, IFLA_GRE_FWMARK, fwmark);
if (erspan_ver) {
addattr8(n, 1024, IFLA_GRE_ERSPAN_VER, erspan_ver);
if (erspan_ver == 1 && erspan_idx != 0) {
addattr32(n, 1024, IFLA_GRE_ERSPAN_INDEX, erspan_idx);
} else if (erspan_ver == 2) {
addattr8(n, 1024, IFLA_GRE_ERSPAN_DIR, erspan_dir);
addattr16(n, 1024, IFLA_GRE_ERSPAN_HWID, erspan_hwid);
}
}
addattr16(n, 1024, IFLA_GRE_ENCAP_TYPE, encaptype);
addattr16(n, 1024, IFLA_GRE_ENCAP_FLAGS, encapflags);
addattr16(n, 1024, IFLA_GRE_ENCAP_SPORT, htons(encapsport));
addattr16(n, 1024, IFLA_GRE_ENCAP_DPORT, htons(encapdport));
return 0;
}
static void gre_print_opt(struct link_util *lu, FILE *f, struct rtattr *tb[])
{
char s2[64];
__u16 iflags = 0;
__u16 oflags = 0;
__u8 ttl = 0;
__u8 tos = 0;
if (!tb)
return;
if (tb[IFLA_GRE_COLLECT_METADATA]) {
print_bool(PRINT_ANY, "external", "external ", true);
return;
}
tnl_print_endpoint("remote", tb[IFLA_GRE_REMOTE], AF_INET);
tnl_print_endpoint("local", tb[IFLA_GRE_LOCAL], AF_INET);
if (tb[IFLA_GRE_LINK]) {
__u32 link = rta_getattr_u32(tb[IFLA_GRE_LINK]);
if (link) {
print_string(PRINT_ANY, "link", "dev %s ",
ll_index_to_name(link));
}
}
if (tb[IFLA_GRE_TTL])
ttl = rta_getattr_u8(tb[IFLA_GRE_TTL]);
if (is_json_context() || ttl)
print_uint(PRINT_ANY, "ttl", "ttl %u ", ttl);
else
print_string(PRINT_FP, NULL, "ttl %s ", "inherit");
if (tb[IFLA_GRE_TOS])
tos = rta_getattr_u8(tb[IFLA_GRE_TOS]);
if (tos) {
if (is_json_context() || tos != 1)
print_0xhex(PRINT_ANY, "tos", "tos %#llx ", tos);
else
print_string(PRINT_FP, NULL, "tos %s ", "inherit");
}
if (tb[IFLA_GRE_PMTUDISC]) {
if (!rta_getattr_u8(tb[IFLA_GRE_PMTUDISC]))
print_bool(PRINT_ANY, "pmtudisc", "nopmtudisc ", false);
else
print_bool(PRINT_JSON, "pmtudisc", NULL, true);
}
if (tb[IFLA_GRE_IGNORE_DF] && rta_getattr_u8(tb[IFLA_GRE_IGNORE_DF]))
print_bool(PRINT_ANY, "ignore_df", "ignore-df ", true);
if (tb[IFLA_GRE_IFLAGS])
iflags = rta_getattr_u16(tb[IFLA_GRE_IFLAGS]);
if (tb[IFLA_GRE_OFLAGS])
oflags = rta_getattr_u16(tb[IFLA_GRE_OFLAGS]);
if ((iflags & GRE_KEY) && tb[IFLA_GRE_IKEY]) {
inet_ntop(AF_INET, RTA_DATA(tb[IFLA_GRE_IKEY]), s2, sizeof(s2));
print_string(PRINT_ANY, "ikey", "ikey %s ", s2);
}
if ((oflags & GRE_KEY) && tb[IFLA_GRE_OKEY]) {
inet_ntop(AF_INET, RTA_DATA(tb[IFLA_GRE_OKEY]), s2, sizeof(s2));
print_string(PRINT_ANY, "okey", "okey %s ", s2);
}
if (iflags & GRE_SEQ)
print_bool(PRINT_ANY, "iseq", "iseq ", true);
if (oflags & GRE_SEQ)
print_bool(PRINT_ANY, "oseq", "oseq ", true);
if (iflags & GRE_CSUM)
print_bool(PRINT_ANY, "icsum", "icsum ", true);
if (oflags & GRE_CSUM)
print_bool(PRINT_ANY, "ocsum", "ocsum ", true);
if (tb[IFLA_GRE_FWMARK]) {
__u32 fwmark = rta_getattr_u32(tb[IFLA_GRE_FWMARK]);
if (fwmark) {
print_0xhex(PRINT_ANY,
"fwmark", "fwmark %#llx ", fwmark);
}
}
if (tb[IFLA_GRE_ERSPAN_INDEX]) {
__u32 erspan_idx = rta_getattr_u32(tb[IFLA_GRE_ERSPAN_INDEX]);
print_uint(PRINT_ANY,
"erspan_index", "erspan_index %u ", erspan_idx);
}
if (tb[IFLA_GRE_ERSPAN_VER]) {
__u8 erspan_ver = rta_getattr_u8(tb[IFLA_GRE_ERSPAN_VER]);
print_uint(PRINT_ANY,
"erspan_ver", "erspan_ver %u ", erspan_ver);
}
if (tb[IFLA_GRE_ERSPAN_DIR]) {
__u8 erspan_dir = rta_getattr_u8(tb[IFLA_GRE_ERSPAN_DIR]);
if (erspan_dir == 0)
print_string(PRINT_ANY, "erspan_dir",
"erspan_dir ingress ", NULL);
else
print_string(PRINT_ANY, "erspan_dir",
"erspan_dir egress ", NULL);
}
if (tb[IFLA_GRE_ERSPAN_HWID]) {
__u16 erspan_hwid = rta_getattr_u16(tb[IFLA_GRE_ERSPAN_HWID]);
print_0xhex(PRINT_ANY,
"erspan_hwid", "erspan_hwid %#llx ", erspan_hwid);
}
tnl_print_encap(tb,
IFLA_GRE_ENCAP_TYPE,
IFLA_GRE_ENCAP_FLAGS,
IFLA_GRE_ENCAP_SPORT,
IFLA_GRE_ENCAP_DPORT);
}
struct link_util gre_link_util = {
.id = "gre",
.maxattr = IFLA_GRE_MAX,
.parse_opt = gre_parse_opt,
.print_opt = gre_print_opt,
.print_help = gre_print_help,
};
struct link_util gretap_link_util = {
.id = "gretap",
.maxattr = IFLA_GRE_MAX,
.parse_opt = gre_parse_opt,
.print_opt = gre_print_opt,
.print_help = gre_print_help,
};
struct link_util erspan_link_util = {
.id = "erspan",
.maxattr = IFLA_GRE_MAX,
.parse_opt = gre_parse_opt,
.print_opt = gre_print_opt,
.print_help = gre_print_help,
};
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