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d17b136f7d
mirror_iproute2/ip/link_ip6tnl.c
Phil Sutter d17b136f7d Use C99 style initializers everywhere 
This big patch was compiled by vimgrepping for memset calls and changing
to C99 initializer if applicable. One notable exception is the
initialization of union bpf_attr in tc/tc_bpf.c: changing it would break
for older gcc versions (at least <=3.4.6).

Calls to memset for struct rtattr pointer fields for parse_rtattr*()
were just dropped since they are not needed.

The changes here allowed the compiler to discover some unused variables,
so get rid of them, too.

Signed-off-by: Phil Sutter <phil@nwl.cc>
Acked-by: David Ahern <dsa@cumulusnetworks.com>
2016-07-20 12:05:24 -07:00

352 lines
9.5 KiB
C
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/*
* link_ip6tnl.c ip6tnl 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: Nicolas Dichtel <nicolas.dichtel@6wind.com>
*
*/
#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 <linux/ip6_tunnel.h>
#include "rt_names.h"
#include "utils.h"
#include "ip_common.h"
#include "tunnel.h"
#define IP6_FLOWINFO_TCLASS htonl(0x0FF00000)
#define IP6_FLOWINFO_FLOWLABEL htonl(0x000FFFFF)
#define DEFAULT_TNL_HOP_LIMIT (64)
static void print_usage(FILE *f)
{
fprintf(f, "Usage: ip link { add | set | change | replace | del } NAME\n");
fprintf(f, " [ mode { ip6ip6 | ipip6 | any } ]\n");
fprintf(f, " type ip6tnl [ remote ADDR ] [ local ADDR ]\n");
fprintf(f, " [ dev PHYS_DEV ] [ encaplimit ELIM ]\n");
fprintf(f, " [ hoplimit HLIM ] [ tclass TCLASS ] [ flowlabel FLOWLABEL ]\n");
fprintf(f, " [ dscp inherit ] [ fwmark inherit ]\n");
fprintf(f, "\n");
fprintf(f, "Where: NAME := STRING\n");
fprintf(f, " ADDR := IPV6_ADDRESS\n");
fprintf(f, " ELIM := { none | 0..255 }(default=%d)\n",
IPV6_DEFAULT_TNL_ENCAP_LIMIT);
fprintf(f, " HLIM := 0..255 (default=%d)\n",
DEFAULT_TNL_HOP_LIMIT);
fprintf(f, " TCLASS := { 0x0..0xff | inherit }\n");
fprintf(f, " FLOWLABEL := { 0x0..0xfffff | inherit }\n");
}
static void usage(void) __attribute__((noreturn));
static void usage(void)
{
print_usage(stderr);
exit(-1);
}
static int ip6tunnel_parse_opt(struct link_util *lu, int argc, char **argv,
struct nlmsghdr *n)
{
struct ifinfomsg *ifi = (struct ifinfomsg *)(n + 1);
struct {
struct nlmsghdr n;
struct ifinfomsg i;
char buf[2048];
} 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 rtattr *tb[IFLA_MAX + 1];
struct rtattr *linkinfo[IFLA_INFO_MAX+1];
struct rtattr *iptuninfo[IFLA_IPTUN_MAX + 1];
int len;
struct in6_addr laddr = {};
struct in6_addr raddr = {};
__u8 hop_limit = DEFAULT_TNL_HOP_LIMIT;
__u8 encap_limit = IPV6_DEFAULT_TNL_ENCAP_LIMIT;
__u32 flowinfo = 0;
__u32 flags = 0;
__u32 link = 0;
__u8 proto = 0;
if (!(n->nlmsg_flags & NLM_F_CREATE)) {
if (rtnl_talk(&rth, &req.n, &req.n, sizeof(req)) < 0) {
get_failed:
fprintf(stderr,
"Failed to get existing tunnel info.\n");
return -1;
}
len = req.n.nlmsg_len;
len -= NLMSG_LENGTH(sizeof(*ifi));
if (len < 0)
goto get_failed;
parse_rtattr(tb, IFLA_MAX, IFLA_RTA(&req.i), 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(iptuninfo, IFLA_IPTUN_MAX,
linkinfo[IFLA_INFO_DATA]);
if (iptuninfo[IFLA_IPTUN_LOCAL])
memcpy(&laddr, RTA_DATA(iptuninfo[IFLA_IPTUN_LOCAL]),
sizeof(laddr));
if (iptuninfo[IFLA_IPTUN_REMOTE])
memcpy(&raddr, RTA_DATA(iptuninfo[IFLA_IPTUN_REMOTE]),
sizeof(raddr));
if (iptuninfo[IFLA_IPTUN_TTL])
hop_limit = rta_getattr_u8(iptuninfo[IFLA_IPTUN_TTL]);
if (iptuninfo[IFLA_IPTUN_ENCAP_LIMIT])
encap_limit = rta_getattr_u8(iptuninfo[IFLA_IPTUN_ENCAP_LIMIT]);
if (iptuninfo[IFLA_IPTUN_FLOWINFO])
flowinfo = rta_getattr_u32(iptuninfo[IFLA_IPTUN_FLOWINFO]);
if (iptuninfo[IFLA_IPTUN_FLAGS])
flags = rta_getattr_u32(iptuninfo[IFLA_IPTUN_FLAGS]);
if (iptuninfo[IFLA_IPTUN_LINK])
link = rta_getattr_u32(iptuninfo[IFLA_IPTUN_LINK]);
if (iptuninfo[IFLA_IPTUN_PROTO])
proto = rta_getattr_u8(iptuninfo[IFLA_IPTUN_PROTO]);
}
while (argc > 0) {
if (matches(*argv, "mode") == 0) {
NEXT_ARG();
if (strcmp(*argv, "ipv6/ipv6") == 0 ||
strcmp(*argv, "ip6ip6") == 0)
proto = IPPROTO_IPV6;
else if (strcmp(*argv, "ip/ipv6") == 0 ||
strcmp(*argv, "ipv4/ipv6") == 0 ||
strcmp(*argv, "ipip6") == 0 ||
strcmp(*argv, "ip4ip6") == 0)
proto = IPPROTO_IPIP;
else if (strcmp(*argv, "any/ipv6") == 0 ||
strcmp(*argv, "any") == 0)
proto = 0;
else
invarg("Cannot guess tunnel mode.", *argv);
} else if (strcmp(*argv, "remote") == 0) {
inet_prefix addr;
NEXT_ARG();
get_prefix(&addr, *argv, preferred_family);
if (addr.family == AF_UNSPEC)
invarg("\"remote\" address family is AF_UNSPEC", *argv);
memcpy(&raddr, addr.data, addr.bytelen);
} else if (strcmp(*argv, "local") == 0) {
inet_prefix addr;
NEXT_ARG();
get_prefix(&addr, *argv, preferred_family);
if (addr.family == AF_UNSPEC)
invarg("\"local\" address family is AF_UNSPEC", *argv);
memcpy(&laddr, addr.data, addr.bytelen);
} else if (matches(*argv, "dev") == 0) {
NEXT_ARG();
link = if_nametoindex(*argv);
if (link == 0)
invarg("\"dev\" is invalid", *argv);
} else if (strcmp(*argv, "hoplimit") == 0 ||
strcmp(*argv, "ttl") == 0 ||
strcmp(*argv, "hlim") == 0) {
__u8 uval;
NEXT_ARG();
if (get_u8(&uval, *argv, 0))
invarg("invalid HLIM", *argv);
hop_limit = uval;
} else if (matches(*argv, "encaplimit") == 0) {
NEXT_ARG();
if (strcmp(*argv, "none") == 0) {
flags |= IP6_TNL_F_IGN_ENCAP_LIMIT;
} else {
__u8 uval;
if (get_u8(&uval, *argv, 0) < -1)
invarg("invalid ELIM", *argv);
encap_limit = uval;
flags &= ~IP6_TNL_F_IGN_ENCAP_LIMIT;
}
} else if (strcmp(*argv, "tclass") == 0 ||
strcmp(*argv, "tc") == 0 ||
strcmp(*argv, "tos") == 0 ||
matches(*argv, "dsfield") == 0) {
__u8 uval;
NEXT_ARG();
flowinfo &= ~IP6_FLOWINFO_TCLASS;
if (strcmp(*argv, "inherit") == 0)
flags |= IP6_TNL_F_USE_ORIG_TCLASS;
else {
if (get_u8(&uval, *argv, 16))
invarg("invalid TClass", *argv);
flowinfo |= htonl((__u32)uval << 20) & IP6_FLOWINFO_TCLASS;
flags &= ~IP6_TNL_F_USE_ORIG_TCLASS;
}
} else if (strcmp(*argv, "flowlabel") == 0 ||
strcmp(*argv, "fl") == 0) {
__u32 uval;
NEXT_ARG();
flowinfo &= ~IP6_FLOWINFO_FLOWLABEL;
if (strcmp(*argv, "inherit") == 0)
flags |= IP6_TNL_F_USE_ORIG_FLOWLABEL;
else {
if (get_u32(&uval, *argv, 16))
invarg("invalid Flowlabel", *argv);
if (uval > 0xFFFFF)
invarg("invalid Flowlabel", *argv);
flowinfo |= htonl(uval) & IP6_FLOWINFO_FLOWLABEL;
flags &= ~IP6_TNL_F_USE_ORIG_FLOWLABEL;
}
} else if (strcmp(*argv, "dscp") == 0) {
NEXT_ARG();
if (strcmp(*argv, "inherit") != 0)
invarg("not inherit", *argv);
flags |= IP6_TNL_F_RCV_DSCP_COPY;
} else if (strcmp(*argv, "fwmark") == 0) {
NEXT_ARG();
if (strcmp(*argv, "inherit") != 0)
invarg("not inherit", *argv);
flags |= IP6_TNL_F_USE_ORIG_FWMARK;
} else
usage();
argc--, argv++;
}
addattr8(n, 1024, IFLA_IPTUN_PROTO, proto);
addattr_l(n, 1024, IFLA_IPTUN_LOCAL, &laddr, sizeof(laddr));
addattr_l(n, 1024, IFLA_IPTUN_REMOTE, &raddr, sizeof(raddr));
addattr8(n, 1024, IFLA_IPTUN_TTL, hop_limit);
addattr8(n, 1024, IFLA_IPTUN_ENCAP_LIMIT, encap_limit);
addattr32(n, 1024, IFLA_IPTUN_FLOWINFO, flowinfo);
addattr32(n, 1024, IFLA_IPTUN_FLAGS, flags);
addattr32(n, 1024, IFLA_IPTUN_LINK, link);
return 0;
}
static void ip6tunnel_print_opt(struct link_util *lu, FILE *f, struct rtattr *tb[])
{
char s2[64];
int flags = 0;
__u32 flowinfo = 0;
if (!tb)
return;
if (tb[IFLA_IPTUN_FLAGS])
flags = rta_getattr_u32(tb[IFLA_IPTUN_FLAGS]);
if (tb[IFLA_IPTUN_FLOWINFO])
flowinfo = rta_getattr_u32(tb[IFLA_IPTUN_FLOWINFO]);
if (tb[IFLA_IPTUN_PROTO]) {
switch (rta_getattr_u8(tb[IFLA_IPTUN_PROTO])) {
case IPPROTO_IPIP:
fprintf(f, "ipip6 ");
break;
case IPPROTO_IPV6:
fprintf(f, "ip6ip6 ");
break;
case 0:
fprintf(f, "any ");
break;
}
}
if (tb[IFLA_IPTUN_REMOTE]) {
fprintf(f, "remote %s ",
rt_addr_n2a_rta(AF_INET6, tb[IFLA_IPTUN_REMOTE]));
}
if (tb[IFLA_IPTUN_LOCAL]) {
fprintf(f, "local %s ",
rt_addr_n2a_rta(AF_INET6, tb[IFLA_IPTUN_LOCAL]));
}
if (tb[IFLA_IPTUN_LINK] && rta_getattr_u32(tb[IFLA_IPTUN_LINK])) {
unsigned int link = rta_getattr_u32(tb[IFLA_IPTUN_LINK]);
const char *n = if_indextoname(link, s2);
if (n)
fprintf(f, "dev %s ", n);
else
fprintf(f, "dev %u ", link);
}
if (flags & IP6_TNL_F_IGN_ENCAP_LIMIT)
printf("encaplimit none ");
else if (tb[IFLA_IPTUN_ENCAP_LIMIT])
fprintf(f, "encaplimit %u ",
rta_getattr_u8(tb[IFLA_IPTUN_ENCAP_LIMIT]));
if (tb[IFLA_IPTUN_TTL])
fprintf(f, "hoplimit %u ", rta_getattr_u8(tb[IFLA_IPTUN_TTL]));
if (flags & IP6_TNL_F_USE_ORIG_TCLASS)
printf("tclass inherit ");
else if (tb[IFLA_IPTUN_FLOWINFO]) {
__u32 val = ntohl(flowinfo & IP6_FLOWINFO_TCLASS);
printf("tclass 0x%02x ", (__u8)(val >> 20));
}
if (flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
printf("flowlabel inherit ");
else
printf("flowlabel 0x%05x ", ntohl(flowinfo & IP6_FLOWINFO_FLOWLABEL));
printf("(flowinfo 0x%08x) ", ntohl(flowinfo));
if (flags & IP6_TNL_F_RCV_DSCP_COPY)
printf("dscp inherit ");
if (flags & IP6_TNL_F_MIP6_DEV)
fprintf(f, "mip6 ");
if (flags & IP6_TNL_F_USE_ORIG_FWMARK)
fprintf(f, "fwmark inherit ");
}
static void ip6tunnel_print_help(struct link_util *lu, int argc, char **argv,
FILE *f)
{
print_usage(f);
}
struct link_util ip6tnl_link_util = {
.id = "ip6tnl",
.maxattr = IFLA_IPTUN_MAX,
.parse_opt = ip6tunnel_parse_opt,
.print_opt = ip6tunnel_print_opt,
.print_help = ip6tunnel_print_help,
};
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