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sockets.c
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sockets.c
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#include <unistd.h>
#include <sys/socket.h>
#include <linux/netlink.h>
#include <linux/rtnetlink.h>
#include <netinet/tcp.h>
#include <errno.h>
#include <linux/if.h>
#include <linux/filter.h>
#include <string.h>
#include "libnetlink.h"
#include "sockets.h"
#include "unix_diag.h"
#include "inet_diag.h"
#include "packet_diag.h"
#include "netlink_diag.h"
#include "files.h"
#include "util-net.h"
#include "sk-packet.h"
#include "namespaces.h"
#include "crtools.h"
#include "net.h"
#ifndef NETLINK_SOCK_DIAG
#define NETLINK_SOCK_DIAG NETLINK_INET_DIAG
#endif
#ifndef SOCK_DIAG_BY_FAMILY
#define SOCK_DIAG_BY_FAMILY 20
#endif
#ifndef SOCKFS_MAGIC
#define SOCKFS_MAGIC 0x534F434B
#endif
#define SK_HASH_SIZE 32
#ifndef SO_GET_FILTER
#define SO_GET_FILTER SO_ATTACH_FILTER
#endif
enum socket_cl_bits
{
NETLINK_CL_BIT,
INET_TCP_CL_BIT,
INET_UDP_CL_BIT,
INET_UDPLITE_CL_BIT,
INET6_TCP_CL_BIT,
INET6_UDP_CL_BIT,
INET6_UDPLITE_CL_BIT,
UNIX_CL_BIT,
PACKET_CL_BIT,
_MAX_CL_BIT,
};
#define MAX_CL_BIT (_MAX_CL_BIT - 1)
static DECLARE_BITMAP(socket_cl_bits, MAX_CL_BIT);
static inline
enum socket_cl_bits get_collect_bit_nr(unsigned int family, unsigned int proto)
{
if (family == AF_NETLINK)
return NETLINK_CL_BIT;
if (family == AF_UNIX)
return UNIX_CL_BIT;
if (family == AF_PACKET)
return PACKET_CL_BIT;
if (family == AF_INET) {
if (proto == IPPROTO_TCP)
return INET_TCP_CL_BIT;
if (proto == IPPROTO_UDP)
return INET_UDP_CL_BIT;
if (proto == IPPROTO_UDPLITE)
return INET_UDPLITE_CL_BIT;
}
if (family == AF_INET6) {
if (proto == IPPROTO_TCP)
return INET6_TCP_CL_BIT;
if (proto == IPPROTO_UDP)
return INET6_UDP_CL_BIT;
if (proto == IPPROTO_UDPLITE)
return INET6_UDPLITE_CL_BIT;
}
pr_err("Unknown pair family %d proto %d\n", family, proto);
BUG();
return -1;
}
static void set_collect_bit(unsigned int family, unsigned int proto)
{
enum socket_cl_bits nr;
nr = get_collect_bit_nr(family, proto);
set_bit(nr, socket_cl_bits);
}
bool socket_test_collect_bit(unsigned int family, unsigned int proto)
{
enum socket_cl_bits nr;
nr = get_collect_bit_nr(family, proto);
return test_bit(nr, socket_cl_bits) != 0;
}
static int dump_bound_dev(int sk, SkOptsEntry *soe)
{
int ret;
char dev[IFNAMSIZ];
socklen_t len = sizeof(dev);
ret = getsockopt(sk, SOL_SOCKET, SO_BINDTODEVICE, &dev, &len);
if (ret) {
pr_perror("Can't get bound dev");
return ret;
}
if (len == 0)
return 0;
pr_debug("\tDumping %s bound dev for sk\n", dev);
soe->so_bound_dev = xmalloc(len);
if (soe->so_bound_dev == NULL)
return -1;
strcpy(soe->so_bound_dev, dev);
return 0;
}
static int restore_bound_dev(int sk, SkOptsEntry *soe)
{
char *n = soe->so_bound_dev;
if (!n)
return 0;
pr_debug("\tBinding socket to %s dev\n", n);
return do_restore_opt(sk, SOL_SOCKET, SO_BINDTODEVICE, n, strlen(n));
}
/*
* Protobuf handles le/be himself, but the sock_filter is not just u64,
* it's a structure and we have to preserve the fields order to be able
* to move socket image across architectures.
*/
static void encode_filter(struct sock_filter *f, uint64_t *img, int n)
{
int i;
BUILD_BUG_ON(sizeof(*f) != sizeof(*img));
for (i = 0; i < n; i++)
img[i] = ((uint64_t)f[i].code << 48) |
((uint64_t)f[i].jt << 40) |
((uint64_t)f[i].jf << 32) |
((uint64_t)f[i].k << 0);
}
static void decode_filter(uint64_t *img, struct sock_filter *f, int n)
{
int i;
for (i = 0; i < n; i++) {
f[i].code = img[i] >> 48;
f[i].jt = img[i] >> 40;
f[i].jf = img[i] >> 32;
f[i].k = img[i] >> 0;
}
}
static int dump_socket_filter(int sk, SkOptsEntry *soe)
{
socklen_t len = 0;
int ret;
struct sock_filter *flt;
ret = getsockopt(sk, SOL_SOCKET, SO_GET_FILTER, NULL, &len);
if (ret) {
pr_perror("Can't get socket filter len");
return ret;
}
if (!len) {
pr_info("No filter for socket\n");
return 0;
}
flt = xmalloc(len * sizeof(*flt));
if (!flt)
return -1;
ret = getsockopt(sk, SOL_SOCKET, SO_GET_FILTER, flt, &len);
if (ret) {
pr_perror("Can't get socket filter");
xfree(flt);
return ret;
}
soe->so_filter = xmalloc(len * sizeof(*soe->so_filter));
if (!soe->so_filter) {
xfree(flt);
return -1;
}
encode_filter(flt, soe->so_filter, len);
soe->n_so_filter = len;
xfree(flt);
return 0;
}
static int restore_socket_filter(int sk, SkOptsEntry *soe)
{
int ret;
struct sock_fprog sfp;
if (!soe->n_so_filter)
return 0;
pr_info("Restoring socket filter\n");
sfp.len = soe->n_so_filter;
sfp.filter = xmalloc(soe->n_so_filter * sfp.len);
if (!sfp.filter)
return -1;
decode_filter(soe->so_filter, sfp.filter, sfp.len);
ret = restore_opt(sk, SOL_SOCKET, SO_ATTACH_FILTER, &sfp);
xfree(sfp.filter);
return ret;
}
static struct socket_desc *sockets[SK_HASH_SIZE];
struct socket_desc *lookup_socket(int ino, int family, int proto)
{
struct socket_desc *sd;
if (!socket_test_collect_bit(family, proto)) {
pr_err("Sockets (family %d, proto %d) are not collected\n",
family, proto);
return ERR_PTR(-EINVAL);
}
pr_debug("\tSearching for socket %x (family %d)\n", ino, family);
for (sd = sockets[ino % SK_HASH_SIZE]; sd; sd = sd->next)
if (sd->ino == ino) {
BUG_ON(sd->family != family);
return sd;
}
return NULL;
}
int sk_collect_one(int ino, int family, struct socket_desc *d)
{
struct socket_desc **chain;
d->ino = ino;
d->family = family;
d->already_dumped = 0;
chain = &sockets[ino % SK_HASH_SIZE];
d->next = *chain;
*chain = d;
return 0;
}
int do_restore_opt(int sk, int level, int name, void *val, int len)
{
if (setsockopt(sk, level, name, val, len) < 0) {
pr_perror("Can't set %d:%d (len %d)", level, name, len);
return -1;
}
return 0;
}
/*
* Set sizes of buffers to maximum and prevent blocking
* Caller of this fn should call other socket restoring
* routines to drop the non-blocking and set proper send
* and receive buffers.
*/
int restore_prepare_socket(int sk)
{
int flags;
/* In kernel a bufsize has type int and a value is doubled. */
u32 maxbuf = INT_MAX / 2;
if (restore_opt(sk, SOL_SOCKET, SO_SNDBUFFORCE, &maxbuf))
return -1;
if (restore_opt(sk, SOL_SOCKET, SO_RCVBUFFORCE, &maxbuf))
return -1;
/* Prevent blocking on restore */
flags = fcntl(sk, F_GETFL, 0);
if (flags == -1) {
pr_perror("Unable to get flags for %d", sk);
return -1;
}
if (fcntl(sk, F_SETFL, flags | O_NONBLOCK) ) {
pr_perror("Unable to set O_NONBLOCK for %d", sk);
return -1;
}
return 0;
}
int restore_socket_opts(int sk, SkOptsEntry *soe)
{
int ret = 0, val;
struct timeval tv;
pr_info("%d restore sndbuf %d rcv buf %d\n", sk, soe->so_sndbuf, soe->so_rcvbuf);
ret |= restore_opt(sk, SOL_SOCKET, SO_SNDBUFFORCE, &soe->so_sndbuf);
ret |= restore_opt(sk, SOL_SOCKET, SO_RCVBUFFORCE, &soe->so_rcvbuf);
if (soe->has_so_priority) {
pr_debug("\trestore priority %d for socket\n", soe->so_priority);
ret |= restore_opt(sk, SOL_SOCKET, SO_PRIORITY, &soe->so_priority);
}
if (soe->has_so_rcvlowat) {
pr_debug("\trestore rcvlowat %d for socket\n", soe->so_rcvlowat);
ret |= restore_opt(sk, SOL_SOCKET, SO_RCVLOWAT, &soe->so_rcvlowat);
}
if (soe->has_so_mark) {
pr_debug("\trestore mark %d for socket\n", soe->so_mark);
ret |= restore_opt(sk, SOL_SOCKET, SO_MARK, &soe->so_mark);
}
if (soe->has_so_passcred && soe->so_passcred) {
val = 1;
pr_debug("\tset passcred for socket\n");
ret |= restore_opt(sk, SOL_SOCKET, SO_PASSCRED, &val);
}
if (soe->has_so_passsec && soe->so_passsec) {
val = 1;
pr_debug("\tset passsec for socket\n");
ret |= restore_opt(sk, SOL_SOCKET, SO_PASSSEC, &val);
}
if (soe->has_so_dontroute && soe->so_dontroute) {
val = 1;
pr_debug("\tset dontroute for socket\n");
ret |= restore_opt(sk, SOL_SOCKET, SO_DONTROUTE, &val);
}
if (soe->has_so_no_check && soe->so_no_check) {
val = 1;
pr_debug("\tset no_check for socket\n");
ret |= restore_opt(sk, SOL_SOCKET, SO_NO_CHECK, &val);
}
tv.tv_sec = soe->so_snd_tmo_sec;
tv.tv_usec = soe->so_snd_tmo_usec;
ret |= restore_opt(sk, SOL_SOCKET, SO_SNDTIMEO, &tv);
tv.tv_sec = soe->so_rcv_tmo_sec;
tv.tv_usec = soe->so_rcv_tmo_usec;
ret |= restore_opt(sk, SOL_SOCKET, SO_RCVTIMEO, &tv);
ret |= restore_bound_dev(sk, soe);
ret |= restore_socket_filter(sk, soe);
/* The restore of SO_REUSEADDR depends on type of socket */
return ret;
}
int do_dump_opt(int sk, int level, int name, void *val, int len)
{
socklen_t aux = len;
if (getsockopt(sk, level, name, val, &aux) < 0) {
pr_perror("Can't get %d:%d opt", level, name);
return -1;
}
if (aux != len) {
pr_err("Len mismatch on %d:%d : %d, want %d\n",
level, name, aux, len);
return -1;
}
return 0;
}
int dump_socket_opts(int sk, SkOptsEntry *soe)
{
int ret = 0, val;
struct timeval tv;
ret |= dump_opt(sk, SOL_SOCKET, SO_SNDBUF, &soe->so_sndbuf);
ret |= dump_opt(sk, SOL_SOCKET, SO_RCVBUF, &soe->so_rcvbuf);
soe->has_so_priority = true;
ret |= dump_opt(sk, SOL_SOCKET, SO_PRIORITY, &soe->so_priority);
soe->has_so_rcvlowat = true;
ret |= dump_opt(sk, SOL_SOCKET, SO_RCVLOWAT, &soe->so_rcvlowat);
soe->has_so_mark = true;
ret |= dump_opt(sk, SOL_SOCKET, SO_MARK, &soe->so_mark);
ret |= dump_opt(sk, SOL_SOCKET, SO_SNDTIMEO, &tv);
soe->so_snd_tmo_sec = tv.tv_sec;
soe->so_snd_tmo_usec = tv.tv_usec;
ret |= dump_opt(sk, SOL_SOCKET, SO_RCVTIMEO, &tv);
soe->so_rcv_tmo_sec = tv.tv_sec;
soe->so_rcv_tmo_usec = tv.tv_usec;
ret |= dump_opt(sk, SOL_SOCKET, SO_REUSEADDR, &val);
soe->reuseaddr = val ? true : false;
soe->has_reuseaddr = true;
ret |= dump_opt(sk, SOL_SOCKET, SO_PASSCRED, &val);
soe->has_so_passcred = true;
soe->so_passcred = val ? true : false;
ret |= dump_opt(sk, SOL_SOCKET, SO_PASSSEC, &val);
soe->has_so_passsec = true;
soe->so_passsec = val ? true : false;
ret |= dump_opt(sk, SOL_SOCKET, SO_DONTROUTE, &val);
soe->has_so_dontroute = true;
soe->so_dontroute = val ? true : false;
ret |= dump_opt(sk, SOL_SOCKET, SO_NO_CHECK, &val);
soe->has_so_no_check = true;
soe->so_no_check = val ? true : false;
ret |= dump_bound_dev(sk, soe);
ret |= dump_socket_filter(sk, soe);
return ret;
}
void release_skopts(SkOptsEntry *soe)
{
xfree(soe->so_filter);
xfree(soe->so_bound_dev);
}
int dump_socket(struct fd_parms *p, int lfd, const int fdinfo)
{
int family;
if (dump_opt(lfd, SOL_SOCKET, SO_DOMAIN, &family))
return -1;
switch (family) {
case AF_UNIX:
return dump_one_unix(p, lfd, fdinfo);
case AF_INET:
return dump_one_inet(p, lfd, fdinfo);
case AF_INET6:
return dump_one_inet6(p, lfd, fdinfo);
case AF_PACKET:
return dump_one_packet_sk(p, lfd, fdinfo);
case AF_NETLINK:
return dump_one_netlink(p, lfd, fdinfo);
default:
pr_err("BUG! Unknown socket collected (family %d)\n", family);
break;
}
return -1;
}
static int inet_receive_one(struct nlmsghdr *h, void *arg)
{
struct inet_diag_req_v2 *i = arg;
int type;
switch (i->sdiag_protocol) {
case IPPROTO_TCP:
type = SOCK_STREAM;
break;
case IPPROTO_UDP:
case IPPROTO_UDPLITE:
type = SOCK_DGRAM;
break;
default:
BUG_ON(1);
return -1;
}
return inet_collect_one(h, i->sdiag_family, type);
}
struct sock_diag_req {
struct nlmsghdr hdr;
union {
struct unix_diag_req u;
struct inet_diag_req_v2 i;
struct packet_diag_req p;
struct netlink_diag_req n;
} r;
};
static int do_collect_req(int nl, struct sock_diag_req *req, int size,
int (*receive_callback)(struct nlmsghdr *h, void *), void *arg)
{
int tmp;
tmp = do_rtnl_req(nl, req, size, receive_callback, arg);
if (tmp == 0)
set_collect_bit(req->r.n.sdiag_family, req->r.n.sdiag_protocol);
return tmp;
}
int collect_sockets(int pid)
{
int err = 0, tmp;
int rst = -1;
int nl;
struct sock_diag_req req;
if (current_ns_mask & CLONE_NEWNET) {
pr_info("Switching to %d's net for collecting sockets\n", pid);
if (switch_ns(pid, &net_ns_desc, &rst))
return -1;
}
nl = socket(PF_NETLINK, SOCK_RAW, NETLINK_SOCK_DIAG);
if (nl < 0) {
pr_perror("Can't create sock diag socket");
err = -1;
goto out;
}
memset(&req, 0, sizeof(req));
req.hdr.nlmsg_len = sizeof(req);
req.hdr.nlmsg_type = SOCK_DIAG_BY_FAMILY;
req.hdr.nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST;
req.hdr.nlmsg_seq = CR_NLMSG_SEQ;
/* Collect UNIX sockets */
req.r.u.sdiag_family = AF_UNIX;
req.r.u.udiag_states = -1; /* All */
req.r.u.udiag_show = UDIAG_SHOW_NAME | UDIAG_SHOW_VFS |
UDIAG_SHOW_PEER | UDIAG_SHOW_ICONS |
UDIAG_SHOW_RQLEN;
tmp = do_collect_req(nl, &req, sizeof(req), unix_receive_one, NULL);
if (tmp)
err = tmp;
/* Collect IPv4 TCP sockets */
req.r.i.sdiag_family = AF_INET;
req.r.i.sdiag_protocol = IPPROTO_TCP;
req.r.i.idiag_ext = 0;
/* Only listening and established sockets supported yet */
req.r.i.idiag_states = (1 << TCP_LISTEN) | (1 << TCP_ESTABLISHED);
tmp = do_collect_req(nl, &req, sizeof(req), inet_receive_one, &req.r.i);
if (tmp)
err = tmp;
/* Collect IPv4 UDP sockets */
req.r.i.sdiag_family = AF_INET;
req.r.i.sdiag_protocol = IPPROTO_UDP;
req.r.i.idiag_ext = 0;
req.r.i.idiag_states = -1; /* All */
tmp = do_collect_req(nl, &req, sizeof(req), inet_receive_one, &req.r.i);
if (tmp)
err = tmp;
/* Collect IPv4 UDP-lite sockets */
req.r.i.sdiag_family = AF_INET;
req.r.i.sdiag_protocol = IPPROTO_UDPLITE;
req.r.i.idiag_ext = 0;
req.r.i.idiag_states = -1; /* All */
tmp = do_collect_req(nl, &req, sizeof(req), inet_receive_one, &req.r.i);
if (tmp)
err = tmp;
/* Collect IPv6 TCP sockets */
req.r.i.sdiag_family = AF_INET6;
req.r.i.sdiag_protocol = IPPROTO_TCP;
req.r.i.idiag_ext = 0;
/* Only listening sockets supported yet */
req.r.i.idiag_states = (1 << TCP_LISTEN) | (1 << TCP_ESTABLISHED);
tmp = do_collect_req(nl, &req, sizeof(req), inet_receive_one, &req.r.i);
if (tmp)
err = tmp;
/* Collect IPv6 UDP sockets */
req.r.i.sdiag_family = AF_INET6;
req.r.i.sdiag_protocol = IPPROTO_UDP;
req.r.i.idiag_ext = 0;
req.r.i.idiag_states = -1; /* All */
tmp = do_collect_req(nl, &req, sizeof(req), inet_receive_one, &req.r.i);
if (tmp)
err = tmp;
/* Collect IPv6 UDP-lite sockets */
req.r.i.sdiag_family = AF_INET6;
req.r.i.sdiag_protocol = IPPROTO_UDPLITE;
req.r.i.idiag_ext = 0;
req.r.i.idiag_states = -1; /* All */
tmp = do_collect_req(nl, &req, sizeof(req), inet_receive_one, &req.r.i);
if (tmp)
err = tmp;
req.r.p.sdiag_family = AF_PACKET;
req.r.p.sdiag_protocol = 0;
req.r.p.pdiag_show = PACKET_SHOW_INFO | PACKET_SHOW_MCLIST |
PACKET_SHOW_FANOUT | PACKET_SHOW_RING_CFG;
tmp = do_collect_req(nl, &req, sizeof(req), packet_receive_one, NULL);
if (tmp) {
pr_warn("The current kernel doesn't support packet_diag\n");
if (pid == 0 || tmp != -ENOENT) /* Fedora 19 */
err = tmp;
}
if (pid == 0 && opts.check_ms_kernel) {
pr_warn("Skipping netling diag check (not yet merged)\n");
goto skip;
}
req.r.n.sdiag_family = AF_NETLINK;
req.r.n.sdiag_protocol = NDIAG_PROTO_ALL;
req.r.n.ndiag_show = NDIAG_SHOW_GROUPS;
tmp = do_collect_req(nl, &req, sizeof(req), netlink_receive_one, NULL);
if (tmp) {
pr_warn("The current kernel doesn't support netlink_diag\n");
if (pid == 0 || tmp != -ENOENT) /* Going to be in 3.10 */
err = tmp;
}
skip:
close(nl);
out:
if (rst >= 0) {
if (restore_ns(rst, &net_ns_desc) < 0)
err = -1;
} else if (pid != 0) {
/*
* If netns isn't dumped, criu will fail only
* if an unsupported socket will be really dumped.
*/
pr_info("Uncollected sockets! Will probably fail later.\n");
err = 0;
}
return err;
}
static inline char *unknown(u32 val)
{
static char unk[12];
snprintf(unk, sizeof(unk), "x%d", val);
return unk;
}
char *skfamily2s(u32 f)
{
if (f == AF_INET)
return " inet";
else if (f == AF_INET6)
return "inet6";
else
return unknown(f);
}
char *sktype2s(u32 t)
{
if (t == SOCK_STREAM)
return "stream";
else if (t == SOCK_DGRAM)
return " dgram";
else
return unknown(t);
}
char *skproto2s(u32 p)
{
if (p == IPPROTO_UDP)
return "udp";
else if (p == IPPROTO_UDPLITE)
return "udpl";
else if (p == IPPROTO_TCP)
return "tcp";
else
return unknown(p);
}
char *skstate2s(u32 state)
{
if (state == TCP_ESTABLISHED)
return " estab";
else if (state == TCP_CLOSE)
return "closed";
else if (state == TCP_LISTEN)
return "listen";
else
return unknown(state);
}