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net.c
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#include <unistd.h>
#include <sys/socket.h>
#include <linux/netlink.h>
#include <linux/rtnetlink.h>
#include <linux/netfilter/nfnetlink.h>
#include <linux/netfilter/nfnetlink_conntrack.h>
#include <linux/netfilter/nf_conntrack_tcp.h>
#include <string.h>
#include <net/if_arp.h>
#include <sys/wait.h>
#include <sched.h>
#include <sys/mount.h>
#include <sys/types.h>
#include <net/if.h>
#include <linux/sockios.h>
#include <libnl3/netlink/attr.h>
#include <libnl3/netlink/msg.h>
#include <libnl3/netlink/netlink.h>
#if defined(CONFIG_HAS_NFTABLES_LIB_API_0) || defined(CONFIG_HAS_NFTABLES_LIB_API_1)
#include <nftables/libnftables.h>
#endif
#ifdef CONFIG_HAS_SELINUX
#include <selinux/selinux.h>
#endif
#include "../soccr/soccr.h"
#include "imgset.h"
#include "namespaces.h"
#include "net.h"
#include "libnetlink.h"
#include "cr_options.h"
#include "sk-inet.h"
#include "tun.h"
#include "util-pie.h"
#include "plugin.h"
#include "action-scripts.h"
#include "sockets.h"
#include "pstree.h"
#include "string.h"
#include "sysctl.h"
#include "kerndat.h"
#include "util.h"
#include "external.h"
#include "fdstore.h"
#include "netfilter.h"
#include "protobuf.h"
#include "images/netdev.pb-c.h"
#include "images/inventory.pb-c.h"
#undef LOG_PREFIX
#define LOG_PREFIX "net: "
#ifndef IFLA_NEW_IFINDEX
#define IFLA_NEW_IFINDEX 49
#endif
#ifndef IFLA_LINK_NETNSID
#define IFLA_LINK_NETNSID 37
#undef IFLA_MAX
#define IFLA_MAX IFLA_LINK_NETNSID
#endif
#ifndef RTM_NEWNSID
#define RTM_NEWNSID 88
#endif
#ifndef IFLA_MACVLAN_FLAGS
#define IFLA_MACVLAN_FLAGS 2
#endif
enum {
IFLA_IPTUN_UNSPEC,
IFLA_IPTUN_LINK,
IFLA_IPTUN_LOCAL,
IFLA_IPTUN_REMOTE,
IFLA_IPTUN_TTL,
IFLA_IPTUN_TOS,
IFLA_IPTUN_ENCAP_LIMIT,
IFLA_IPTUN_FLOWINFO,
IFLA_IPTUN_FLAGS,
IFLA_IPTUN_PROTO,
IFLA_IPTUN_PMTUDISC,
IFLA_IPTUN_6RD_PREFIX,
IFLA_IPTUN_6RD_RELAY_PREFIX,
IFLA_IPTUN_6RD_PREFIXLEN,
IFLA_IPTUN_6RD_RELAY_PREFIXLEN,
IFLA_IPTUN_ENCAP_TYPE,
IFLA_IPTUN_ENCAP_FLAGS,
IFLA_IPTUN_ENCAP_SPORT,
IFLA_IPTUN_ENCAP_DPORT,
__IFLA_IPTUN_MAX,
};
#define IFLA_IPTUN_MAX (__IFLA_IPTUN_MAX - 1)
static int ns_sysfs_fd = -1;
int read_ns_sys_file(char *path, char *buf, int len)
{
int fd, rlen;
BUG_ON(ns_sysfs_fd == -1);
fd = openat(ns_sysfs_fd, path, O_RDONLY, 0);
if (fd < 0) {
pr_perror("Can't open ns' %s", path);
return -1;
}
rlen = read(fd, buf, len);
if (rlen == -1)
pr_perror("Can't read ns' %s", path);
close(fd);
if (rlen == len) {
buf[0] = '\0';
pr_err("Too small buffer to read ns sys file %s\n", path);
return -1;
}
if (rlen >= 0)
buf[rlen] = '\0';
return rlen;
}
static bool sysctl_entries_equal(SysctlEntry *a, SysctlEntry *b)
{
if (a->type != b->type)
return false;
switch (a->type) {
case SYSCTL_TYPE__CTL_32:
return a->has_iarg && b->has_iarg && a->iarg == b->iarg;
case SYSCTL_TYPE__CTL_STR:
return a->sarg && b->sarg && !strcmp(a->sarg, b->sarg);
default:;
}
return false;
}
static char *devconfs4[] = {
"accept_local",
"accept_redirects",
"accept_source_route",
"arp_accept",
"arp_announce",
"arp_filter",
"arp_ignore",
"arp_notify",
"bootp_relay",
"disable_policy",
"disable_xfrm",
"force_igmp_version",
"forwarding",
"igmpv2_unsolicited_report_interval",
"igmpv3_unsolicited_report_interval",
"log_martians",
"medium_id",
"promote_secondaries",
"proxy_arp",
"proxy_arp_pvlan",
"route_localnet",
"rp_filter",
"secure_redirects",
"send_redirects",
"shared_media",
"src_valid_mark",
"tag",
"ignore_routes_with_linkdown",
"drop_gratuitous_arp",
"drop_unicast_in_l2_multicast",
};
char *devconfs6[] = {
"accept_dad",
"accept_ra",
"accept_ra_defrtr",
"accept_ra_from_local",
"accept_ra_min_hop_limit",
"accept_ra_mtu",
"accept_ra_pinfo",
"accept_ra_rt_info_max_plen",
"accept_ra_rtr_pref",
"accept_redirects",
"accept_source_route",
"autoconf",
"dad_transmits",
"disable_ipv6",
"drop_unicast_in_l2_multicast",
"drop_unsolicited_na",
"force_mld_version",
"force_tllao",
"forwarding",
"hop_limit",
"ignore_routes_with_linkdown",
"keep_addr_on_down",
"max_addresses",
"max_desync_factor",
"mldv1_unsolicited_report_interval",
"mldv2_unsolicited_report_interval",
"mtu",
"ndisc_notify",
"optimistic_dad",
"proxy_ndp",
"regen_max_retry",
"router_probe_interval",
"router_solicitation_delay",
"router_solicitation_interval",
"router_solicitations",
"stable_secret",
"suppress_frag_ndisc",
"temp_prefered_lft",
"temp_valid_lft",
"use_oif_addrs_only",
"use_optimistic",
"use_tempaddr",
};
#define CONF_OPT_PATH "net/%s/conf/%s/%s"
#define MAX_CONF_OPT_PATH IFNAMSIZ + 60
#define MAX_STR_CONF_LEN 200
static const char *unix_conf_entries[] = {
"max_dgram_qlen",
};
/*
* MAX_CONF_UNIX_PATH = (sizeof(CONF_UNIX_FMT) - strlen("%s"))
* + MAX_CONF_UNIX_OPT_PATH
*/
#define CONF_UNIX_BASE "net/unix"
#define CONF_UNIX_FMT CONF_UNIX_BASE "/%s"
#define MAX_CONF_UNIX_OPT_PATH 32
#define MAX_CONF_UNIX_PATH (sizeof(CONF_UNIX_FMT) + MAX_CONF_UNIX_OPT_PATH - 2)
static int net_conf_op(char *tgt, SysctlEntry **conf, int n, int op, char *proto, struct sysctl_req *req,
char (*path)[MAX_CONF_OPT_PATH], int size, char **devconfs, SysctlEntry **def_conf)
{
int i, ri, ar = -1;
int ret, flags = op == CTL_READ ? CTL_FLAGS_OPTIONAL : 0;
SysctlEntry **rconf;
if (n > size)
pr_warn("The image contains unknown sysctl-s\n");
if (opts.weak_sysctls)
flags = CTL_FLAGS_OPTIONAL;
rconf = xmalloc(sizeof(SysctlEntry *) * size);
if (!rconf)
return -1;
for (i = 0, ri = 0; i < size; i++) {
if (i >= n) {
pr_warn("Skip %s/%s\n", tgt, devconfs[i]);
continue;
}
/*
* If dev conf value is the same as default skip restoring it,
* mtu may be changed by disable_ipv6 so we can not skip
* it's restore
*/
if (def_conf && sysctl_entries_equal(conf[i], def_conf[i]) && strcmp(devconfs[i], "mtu")) {
pr_debug("Skip %s/%s, coincides with default\n", tgt, devconfs[i]);
continue;
}
/*
* Make "accept_redirects" go last on write(it should
* restore after forwarding to be correct)
*/
if (op == CTL_WRITE && !strcmp(devconfs[i], "accept_redirects")) {
ar = i;
continue;
}
snprintf(path[i], MAX_CONF_OPT_PATH, CONF_OPT_PATH, proto, tgt, devconfs[i]);
req[ri].name = path[i];
req[ri].flags = flags;
switch (conf[i]->type) {
case SYSCTL_TYPE__CTL_32:
req[ri].type = CTL_32;
/* skip non-existing sysctl */
if (op == CTL_WRITE && !conf[i]->has_iarg)
continue;
req[ri].arg = &conf[i]->iarg;
break;
case SYSCTL_TYPE__CTL_STR:
req[ri].type = CTL_STR(MAX_STR_CONF_LEN);
req[ri].flags |=
op == CTL_READ && !strcmp(devconfs[i], "stable_secret") ? CTL_FLAGS_READ_EIO_SKIP : 0;
/* skip non-existing sysctl */
if (op == CTL_WRITE && !conf[i]->sarg)
continue;
req[ri].arg = conf[i]->sarg;
break;
default:
continue;
}
rconf[ri] = conf[i];
ri++;
}
if (ar != -1 && conf[ar]->type == SYSCTL_TYPE__CTL_32 && conf[ar]->has_iarg) {
snprintf(path[ar], MAX_CONF_OPT_PATH, CONF_OPT_PATH, proto, tgt, devconfs[ar]);
req[ri].name = path[ar];
req[ri].type = CTL_32;
req[ri].arg = &conf[ar]->iarg;
req[ri].flags = flags;
rconf[ri] = conf[ar];
ri++;
}
ret = sysctl_op(req, ri, op, CLONE_NEWNET);
if (ret < 0) {
pr_err("Failed to %s %s/<confs>\n", (op == CTL_READ) ? "read" : "write", tgt);
goto err_free;
}
if (op == CTL_READ) {
/* (un)mark (non-)existing sysctls in image */
for (i = 0; i < ri; i++)
if (req[i].flags & CTL_FLAGS_HAS) {
if (rconf[i]->type == SYSCTL_TYPE__CTL_32)
rconf[i]->has_iarg = true;
} else {
if (rconf[i]->type == SYSCTL_TYPE__CTL_STR)
rconf[i]->sarg = NULL;
}
}
err_free:
xfree(rconf);
return ret;
}
static int ipv4_conf_op(char *tgt, SysctlEntry **conf, int n, int op, SysctlEntry **def_conf)
{
struct sysctl_req req[ARRAY_SIZE(devconfs4)];
char path[ARRAY_SIZE(devconfs4)][MAX_CONF_OPT_PATH];
return net_conf_op(tgt, conf, n, op, "ipv4", req, path, ARRAY_SIZE(devconfs4), devconfs4, def_conf);
}
static int ipv6_conf_op(char *tgt, SysctlEntry **conf, int n, int op, SysctlEntry **def_conf)
{
struct sysctl_req req[ARRAY_SIZE(devconfs6)];
char path[ARRAY_SIZE(devconfs6)][MAX_CONF_OPT_PATH];
return net_conf_op(tgt, conf, n, op, "ipv6", req, path, ARRAY_SIZE(devconfs6), devconfs6, def_conf);
}
static int unix_conf_op(SysctlEntry ***rconf, size_t *pn, int op)
{
int i, ret = -1, flags = 0;
char path[ARRAY_SIZE(unix_conf_entries)][MAX_CONF_UNIX_PATH] = {};
struct sysctl_req req[ARRAY_SIZE(unix_conf_entries)] = {};
SysctlEntry **conf = *rconf;
size_t n = *pn;
if (n != ARRAY_SIZE(unix_conf_entries)) {
pr_err("unix: Unexpected entries in config (%zu %zu)\n", n, ARRAY_SIZE(unix_conf_entries));
return -EINVAL;
}
if (opts.weak_sysctls || op == CTL_READ)
flags = CTL_FLAGS_OPTIONAL;
for (i = 0; i < n; i++) {
snprintf(path[i], MAX_CONF_UNIX_PATH, CONF_UNIX_FMT, unix_conf_entries[i]);
req[i].name = path[i];
req[i].flags = flags;
switch (conf[i]->type) {
case SYSCTL_TYPE__CTL_32:
req[i].type = CTL_32;
req[i].arg = &conf[i]->iarg;
break;
default:
pr_err("unix: Unknown config type %d\n", conf[i]->type);
return -1;
}
}
ret = sysctl_op(req, n, op, CLONE_NEWNET);
if (ret < 0) {
pr_err("unix: Failed to %s %s/<confs>\n", (op == CTL_READ) ? "read" : "write", CONF_UNIX_BASE);
return -1;
}
if (op == CTL_READ) {
bool has_entries = false;
for (i = 0; i < n; i++) {
if (req[i].flags & CTL_FLAGS_HAS) {
conf[i]->has_iarg = true;
if (!has_entries)
has_entries = true;
}
}
/*
* Zap the whole section of data.
* Unix conf is optional.
*/
if (!has_entries) {
*pn = 0;
*rconf = NULL;
}
}
return 0;
}
/*
* I case if some entry is missing in
* the kernel, simply write DEVCONFS_UNUSED
* into the image so we would skip it.
*/
#define DEVCONFS_UNUSED (-1u)
static int ipv4_conf_op_old(char *tgt, int *conf, int n, int op, int *def_conf)
{
int i, ri;
int ret, flags = op == CTL_READ ? CTL_FLAGS_OPTIONAL : 0;
struct sysctl_req req[ARRAY_SIZE(devconfs4)];
char path[ARRAY_SIZE(devconfs4)][MAX_CONF_OPT_PATH];
if (n > ARRAY_SIZE(devconfs4))
pr_warn("The image contains unknown sysctl-s\n");
for (i = 0, ri = 0; i < ARRAY_SIZE(devconfs4); i++) {
if (i >= n) {
pr_warn("Skip %s/%s\n", tgt, devconfs4[i]);
continue;
}
/*
* If dev conf value is the same as default skip restoring it
*/
if (def_conf && conf[i] == def_conf[i]) {
pr_debug("DEBUG Skip %s/%s, val =%d\n", tgt, devconfs4[i], conf[i]);
continue;
}
if (op == CTL_WRITE && conf[i] == DEVCONFS_UNUSED)
continue;
else if (op == CTL_READ)
conf[i] = DEVCONFS_UNUSED;
snprintf(path[i], MAX_CONF_OPT_PATH, CONF_OPT_PATH, "ipv4", tgt, devconfs4[i]);
req[ri].name = path[i];
req[ri].arg = &conf[i];
req[ri].type = CTL_32;
req[ri].flags = flags;
ri++;
}
ret = sysctl_op(req, ri, op, CLONE_NEWNET);
if (ret < 0) {
pr_err("Failed to %s %s/<confs>\n", (op == CTL_READ) ? "read" : "write", tgt);
return -1;
}
return 0;
}
int write_netdev_img(NetDeviceEntry *nde, struct cr_imgset *fds, struct nlattr **info)
{
return pb_write_one(img_from_set(fds, CR_FD_NETDEV), nde, PB_NETDEV);
}
static int lookup_net_by_netid(struct ns_id *ns, int net_id)
{
struct netns_id *p;
list_for_each_entry(p, &ns->net.ids, node)
if (p->netnsid_value == net_id)
return p->target_ns_id;
return -1;
}
static int dump_one_netdev(int type, struct ifinfomsg *ifi, struct nlattr **tb, struct ns_id *ns, struct cr_imgset *fds,
int (*dump)(NetDeviceEntry *, struct cr_imgset *, struct nlattr **info))
{
int ret = -1, i, peer_ifindex;
NetDeviceEntry netdev = NET_DEVICE_ENTRY__INIT;
SysctlEntry *confs4 = NULL;
int size4 = ARRAY_SIZE(devconfs4);
SysctlEntry *confs6 = NULL;
int size6 = ARRAY_SIZE(devconfs6);
char stable_secret[MAX_STR_CONF_LEN + 1] = {};
struct nlattr *info[IFLA_INFO_MAX + 1], **arg = NULL;
if (!tb[IFLA_IFNAME]) {
pr_err("No name for link %d\n", ifi->ifi_index);
return -1;
}
netdev.type = type;
netdev.ifindex = ifi->ifi_index;
netdev.mtu = *(int *)RTA_DATA(tb[IFLA_MTU]);
netdev.flags = ifi->ifi_flags;
netdev.name = RTA_DATA(tb[IFLA_IFNAME]);
if (kdat.has_nsid) {
s32 nsid = -1;
peer_ifindex = ifi->ifi_index;
if (tb[IFLA_LINK])
peer_ifindex = nla_get_u32(tb[IFLA_LINK]);
netdev.has_peer_ifindex = true;
netdev.peer_ifindex = peer_ifindex;
if (tb[IFLA_LINK_NETNSID])
nsid = nla_get_s32(tb[IFLA_LINK_NETNSID]);
pr_debug("The peer link is in the %d netns with the %u index\n", nsid, netdev.peer_ifindex);
if (nsid == -1)
nsid = ns->id;
else
nsid = lookup_net_by_netid(ns, nsid);
if (nsid < 0) {
pr_warn("The %s veth is in an external netns\n", netdev.name);
} else {
netdev.has_peer_nsid = true;
netdev.peer_nsid = nsid;
}
}
/*
* If kdat.has_nsid is false, a multiple network namespaces are not dumped,
* so if we are here, this means only one netns is dumped.
*/
if (tb[IFLA_ADDRESS] && (type != ND_TYPE__LOOPBACK)) {
netdev.has_address = true;
netdev.address.data = nla_data(tb[IFLA_ADDRESS]);
netdev.address.len = nla_len(tb[IFLA_ADDRESS]);
pr_info("Found ll addr (%02x:../%d) for %s\n", (int)netdev.address.data[0], (int)netdev.address.len,
netdev.name);
}
if (tb[IFLA_MASTER]) {
netdev.has_master = true;
netdev.master = nla_get_u32(tb[IFLA_MASTER]);
}
netdev.n_conf4 = size4;
netdev.conf4 = xmalloc(sizeof(SysctlEntry *) * size4);
if (!netdev.conf4)
goto err_free;
confs4 = xmalloc(sizeof(SysctlEntry) * size4);
if (!confs4)
goto err_free;
for (i = 0; i < size4; i++) {
sysctl_entry__init(&confs4[i]);
netdev.conf4[i] = &confs4[i];
netdev.conf4[i]->type = CTL_32;
}
netdev.n_conf6 = size6;
netdev.conf6 = xmalloc(sizeof(SysctlEntry *) * size6);
if (!netdev.conf6)
goto err_free;
confs6 = xmalloc(sizeof(SysctlEntry) * size6);
if (!confs6)
goto err_free;
for (i = 0; i < size6; i++) {
sysctl_entry__init(&confs6[i]);
netdev.conf6[i] = &confs6[i];
if (strcmp(devconfs6[i], "stable_secret")) {
netdev.conf6[i]->type = SYSCTL_TYPE__CTL_32;
} else {
netdev.conf6[i]->type = SYSCTL_TYPE__CTL_STR;
netdev.conf6[i]->sarg = stable_secret;
}
}
ret = ipv4_conf_op(netdev.name, netdev.conf4, size4, CTL_READ, NULL);
if (ret < 0)
goto err_free;
ret = ipv6_conf_op(netdev.name, netdev.conf6, size6, CTL_READ, NULL);
if (ret < 0)
goto err_free;
if (!dump)
dump = write_netdev_img;
if (tb[IFLA_LINKINFO]) {
ret = nla_parse_nested(info, IFLA_INFO_MAX, tb[IFLA_LINKINFO], NULL);
if (ret < 0) {
pr_err("failed to parse nested linkinfo\n");
return -1;
}
arg = info;
}
ret = dump(&netdev, fds, arg);
err_free:
xfree(netdev.conf4);
xfree(confs4);
xfree(netdev.conf6);
xfree(confs6);
return ret;
}
static char *link_kind(struct ifinfomsg *ifi, struct nlattr **tb)
{
struct nlattr *linkinfo[IFLA_INFO_MAX + 1];
if (!tb[IFLA_LINKINFO]) {
pr_err("No linkinfo for eth link %d\n", ifi->ifi_index);
return NULL;
}
nla_parse_nested(linkinfo, IFLA_INFO_MAX, tb[IFLA_LINKINFO], NULL);
if (!linkinfo[IFLA_INFO_KIND]) {
pr_err("No kind for eth link %d\n", ifi->ifi_index);
return NULL;
}
return nla_data(linkinfo[IFLA_INFO_KIND]);
}
static int dump_unknown_device(struct ifinfomsg *ifi, char *kind, struct nlattr **tb, struct ns_id *ns,
struct cr_imgset *fds)
{
int ret;
ret = run_plugins(DUMP_EXT_LINK, ifi->ifi_index, ifi->ifi_type, kind);
if (ret == 0)
return dump_one_netdev(ND_TYPE__EXTLINK, ifi, tb, ns, fds, NULL);
if (ret == -ENOTSUP)
pr_err("Unsupported link %d (type %d kind %s)\n", ifi->ifi_index, ifi->ifi_type, kind);
return -1;
}
static int dump_bridge(NetDeviceEntry *nde, struct cr_imgset *imgset, struct nlattr **info)
{
return write_netdev_img(nde, imgset, info);
}
static int dump_macvlan(NetDeviceEntry *nde, struct cr_imgset *imgset, struct nlattr **info)
{
MacvlanLinkEntry macvlan = MACVLAN_LINK_ENTRY__INIT;
int ret;
struct nlattr *data[IFLA_MACVLAN_FLAGS + 1];
if (!info || !info[IFLA_INFO_DATA]) {
pr_err("no data for macvlan\n");
return -1;
}
ret = nla_parse_nested(data, IFLA_MACVLAN_FLAGS, info[IFLA_INFO_DATA], NULL);
if (ret < 0) {
pr_err("failed to parse macvlan data\n");
return -1;
}
if (!data[IFLA_MACVLAN_MODE]) {
pr_err("macvlan mode required for %s\n", nde->name);
return -1;
}
macvlan.mode = *((u32 *)RTA_DATA(data[IFLA_MACVLAN_MODE]));
if (data[IFLA_MACVLAN_FLAGS])
macvlan.flags = *((u16 *)RTA_DATA(data[IFLA_MACVLAN_FLAGS]));
nde->macvlan = &macvlan;
return write_netdev_img(nde, imgset, info);
}
static int dump_one_ethernet(struct ifinfomsg *ifi, char *kind, struct nlattr **tb, struct ns_id *ns,
struct cr_imgset *fds)
{
if (!strcmp(kind, "veth"))
/*
* This is not correct. The peer of the veth device may
* be either outside or inside the netns we're working
* on, but there's currently no way of finding this out.
*
* Sigh... we have to assume, that the veth device is a
* connection to the outer world and just dump this end :(
*/
return dump_one_netdev(ND_TYPE__VETH, ifi, tb, ns, fds, NULL);
if (!strcmp(kind, "tun"))
return dump_one_netdev(ND_TYPE__TUN, ifi, tb, ns, fds, dump_tun_link);
if (!strcmp(kind, "bridge"))
return dump_one_netdev(ND_TYPE__BRIDGE, ifi, tb, ns, fds, dump_bridge);
if (!strcmp(kind, "gretap")) {
char *name = (char *)RTA_DATA(tb[IFLA_IFNAME]);
if (!name) {
pr_err("gretap %d has no name\n", ifi->ifi_index);
return -1;
}
if (!strcmp(name, "gretap0")) {
pr_info("found %s, ignoring\n", name);
return 0;
}
pr_warn("GRE tap device %s not supported natively\n", name);
}
if (!strcmp(kind, "macvlan"))
return dump_one_netdev(ND_TYPE__MACVLAN, ifi, tb, ns, fds, dump_macvlan);
return dump_unknown_device(ifi, kind, tb, ns, fds);
}
static int dump_one_gendev(struct ifinfomsg *ifi, char *kind, struct nlattr **tb, struct ns_id *ns,
struct cr_imgset *fds)
{
if (!strcmp(kind, "tun"))
return dump_one_netdev(ND_TYPE__TUN, ifi, tb, ns, fds, dump_tun_link);
return dump_unknown_device(ifi, kind, tb, ns, fds);
}
static int dump_one_voiddev(struct ifinfomsg *ifi, char *kind, struct nlattr **tb, struct ns_id *ns,
struct cr_imgset *fds)
{
if (!strcmp(kind, "venet"))
return dump_one_netdev(ND_TYPE__VENET, ifi, tb, ns, fds, NULL);
return dump_unknown_device(ifi, kind, tb, ns, fds);
}
static int dump_one_gre(struct ifinfomsg *ifi, char *kind, struct nlattr **tb, struct ns_id *ns, struct cr_imgset *fds)
{
if (!strcmp(kind, "gre")) {
char *name = (char *)RTA_DATA(tb[IFLA_IFNAME]);
if (!name) {
pr_err("gre device %d has no name\n", ifi->ifi_index);
return -1;
}
if (!strcmp(name, "gre0")) {
pr_info("found %s, ignoring\n", name);
return 0;
}
pr_warn("GRE tunnel device %s not supported natively\n", name);
}
return dump_unknown_device(ifi, kind, tb, ns, fds);
}
static int dump_sit(NetDeviceEntry *nde, struct cr_imgset *imgset, struct nlattr **info)
{
int ret;
struct nlattr *data[__IFLA_IPTUN_MAX];
SitEntry se = SIT_ENTRY__INIT;
/* There are for IP(v6) addresses kernel feeds to us */
uint32_t a_local, a_remote, rd_prefix[4], rl_prefix;
if (!info || !info[IFLA_INFO_DATA]) {
pr_err("no data for sit\n");
return -1;
}
pr_info("Some data for SIT provided\n");
ret = nla_parse_nested(data, IFLA_IPTUN_MAX, info[IFLA_INFO_DATA], NULL);
if (ret < 0) {
pr_err("failed to parse sit data\n");
return -1;
}
#define ENCODE_ENTRY(__type, __ifla, __proto) \
do { \
if (data[__ifla]) { \
se.__proto = *(__type *)nla_data(data[__ifla]); \
se.has_##__proto = true; \
} \
} while (0)
if (data[IFLA_IPTUN_LOCAL]) {
a_local = *(u32 *)nla_data(data[IFLA_IPTUN_LOCAL]);
if (a_local != 0) {
se.n_local = 1;
se.local = &a_local;
}
}
if (data[IFLA_IPTUN_REMOTE]) {
a_remote = *(u32 *)nla_data(data[IFLA_IPTUN_REMOTE]);
if (a_remote != 0) {
se.n_remote = 1;
se.remote = &a_remote;
}
}
ENCODE_ENTRY(u32, IFLA_IPTUN_LINK, link);
ENCODE_ENTRY(u8, IFLA_IPTUN_TTL, ttl);
ENCODE_ENTRY(u8, IFLA_IPTUN_TOS, tos);
ENCODE_ENTRY(u16, IFLA_IPTUN_FLAGS, flags);
ENCODE_ENTRY(u8, IFLA_IPTUN_PROTO, proto);
if (data[IFLA_IPTUN_PMTUDISC]) {
u8 v;
v = *(u8 *)nla_data(data[IFLA_IPTUN_PMTUDISC]);
if (v)
se.pmtudisc = se.has_pmtudisc = true;
}
ENCODE_ENTRY(u16, IFLA_IPTUN_ENCAP_TYPE, encap_type);
ENCODE_ENTRY(u16, IFLA_IPTUN_ENCAP_FLAGS, encap_flags);
ENCODE_ENTRY(u16, IFLA_IPTUN_ENCAP_SPORT, encap_sport);
ENCODE_ENTRY(u16, IFLA_IPTUN_ENCAP_DPORT, encap_dport);
if (data[IFLA_IPTUN_6RD_PREFIXLEN]) {
se.rd_prefixlen = *(u16 *)nla_data(data[IFLA_IPTUN_6RD_PREFIXLEN]);
if (!se.rd_prefixlen)
goto skip;
if (!data[IFLA_IPTUN_6RD_PREFIX]) {
pr_err("No 6rd prefix for sit device\n");
return -1;
}
se.has_rd_prefixlen = true;
memcpy(&rd_prefix, nla_data(data[IFLA_IPTUN_6RD_PREFIX]), sizeof(rd_prefix));
se.n_rd_prefix = 4;
se.rd_prefix = rd_prefix;
se.relay_prefixlen = *(u16 *)nla_data(data[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]);
if (!se.relay_prefixlen)
goto skip;
if (!data[IFLA_IPTUN_6RD_RELAY_PREFIX]) {
pr_err("No 6rd relay prefix for sit device\n");
return -1;
}
se.has_relay_prefixlen = true;
memcpy(&rl_prefix, nla_data(data[IFLA_IPTUN_6RD_RELAY_PREFIX]), sizeof(rl_prefix));
se.n_relay_prefix = 1;
se.relay_prefix = &rl_prefix;
skip:;
}
#undef ENCODE_ENTRY
nde->sit = &se;
return write_netdev_img(nde, imgset, info);
}
static int dump_one_sit(struct ifinfomsg *ifi, char *kind, struct nlattr **tb, struct ns_id *ns, struct cr_imgset *fds)
{
char *name;
if (strcmp(kind, "sit")) {
pr_err("SIT device with %s kind\n", kind);
return -1;
}
name = (char *)RTA_DATA(tb[IFLA_IFNAME]);
if (!name) {
pr_err("sit device %d has no name\n", ifi->ifi_index);
return -1;
}
if (!strcmp(name, "sit0")) {
pr_info("found %s, ignoring\n", name);
return 0;
}
return dump_one_netdev(ND_TYPE__SIT, ifi, tb, ns, fds, dump_sit);
}
static int list_one_link(struct nlmsghdr *hdr, struct ns_id *ns, void *arg)
{
return 0;
}
static int dump_one_link(struct nlmsghdr *hdr, struct ns_id *ns, void *arg)
{
struct cr_imgset *fds = arg;
struct ifinfomsg *ifi;
int ret = 0, len = hdr->nlmsg_len - NLMSG_LENGTH(sizeof(*ifi));
struct nlattr *tb[IFLA_MAX + 1];
char *kind;
ifi = NLMSG_DATA(hdr);
if (len < 0) {
pr_err("No iflas for link %d\n", ifi->ifi_index);
return -1;
}
nlmsg_parse(hdr, sizeof(struct ifinfomsg), tb, IFLA_MAX, NULL);
pr_info("\tLD: Got link %d, type %d\n", ifi->ifi_index, ifi->ifi_type);
if (ifi->ifi_type == ARPHRD_LOOPBACK)
return dump_one_netdev(ND_TYPE__LOOPBACK, ifi, tb, ns, fds, NULL);
kind = link_kind(ifi, tb);
if (!kind)
goto unk;
switch (ifi->ifi_type) {
case ARPHRD_ETHER:
ret = dump_one_ethernet(ifi, kind, tb, ns, fds);
break;
case ARPHRD_NONE:
ret = dump_one_gendev(ifi, kind, tb, ns, fds);
break;
case ARPHRD_VOID:
ret = dump_one_voiddev(ifi, kind, tb, ns, fds);
break;
case ARPHRD_IPGRE:
ret = dump_one_gre(ifi, kind, tb, ns, fds);
break;
case ARPHRD_SIT:
ret = dump_one_sit(ifi, kind, tb, ns, fds);
break;
default:
unk:
ret = dump_unknown_device(ifi, kind, tb, ns, fds);
break;
}
return ret;
}
static int dump_one_nf(struct nlmsghdr *hdr, struct ns_id *ns, void *arg)
{
struct cr_img *img = arg;
if (lazy_image(img) && open_image_lazy(img))
return -1;
if (write_img_buf(img, hdr, hdr->nlmsg_len))
return -1;
return 0;
}
static int ct_restore_callback(struct nlmsghdr *nlh)
{
struct nfgenmsg *msg;
struct nlattr *tb[CTA_MAX + 1], *tbp[CTA_PROTOINFO_MAX + 1], *tb_tcp[CTA_PROTOINFO_TCP_MAX + 1];
int err;
msg = NLMSG_DATA(nlh);
if (msg->nfgen_family != AF_INET && msg->nfgen_family != AF_INET6)
return 0;
err = nlmsg_parse(nlh, sizeof(struct nfgenmsg), tb, CTA_MAX, NULL);
if (err < 0)
return -1;
if (!tb[CTA_PROTOINFO])
return 0;
err = nla_parse_nested(tbp, CTA_PROTOINFO_MAX, tb[CTA_PROTOINFO], NULL);
if (err < 0)
return -1;
if (!tbp[CTA_PROTOINFO_TCP])
return 0;
err = nla_parse_nested(tb_tcp, CTA_PROTOINFO_TCP_MAX, tbp[CTA_PROTOINFO_TCP], NULL);
if (err < 0)
return -1;
if (tb_tcp[CTA_PROTOINFO_TCP_FLAGS_ORIGINAL]) {
struct nf_ct_tcp_flags *flags;
flags = nla_data(tb_tcp[CTA_PROTOINFO_TCP_FLAGS_ORIGINAL]);
flags->flags |= IP_CT_TCP_FLAG_BE_LIBERAL;
flags->mask |= IP_CT_TCP_FLAG_BE_LIBERAL;
}
if (tb_tcp[CTA_PROTOINFO_TCP_FLAGS_REPLY]) {
struct nf_ct_tcp_flags *flags;
flags = nla_data(tb_tcp[CTA_PROTOINFO_TCP_FLAGS_REPLY]);
flags->flags |= IP_CT_TCP_FLAG_BE_LIBERAL;
flags->mask |= IP_CT_TCP_FLAG_BE_LIBERAL;
}