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sk-netlink.c
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sk-netlink.c
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#include <unistd.h>
#include <linux/netlink.h>
#include <linux/rtnetlink.h>
#include <poll.h>
#include "crtools.h"
#include "files.h"
#include "sockets.h"
#include "util.h"
#include "protobuf.h"
#include "protobuf/sk-netlink.pb-c.h"
#include "netlink_diag.h"
#include "libnetlink.h"
struct netlink_sk_desc {
struct socket_desc sd;
u32 portid;
u32 *groups;
u32 gsize;
u32 dst_portid;
u32 dst_group;
u8 state;
u8 protocol;
};
int netlink_receive_one(struct nlmsghdr *hdr, void *arg)
{
struct rtattr *tb[NETLINK_DIAG_MAX+1];
struct netlink_diag_msg *m;
struct netlink_sk_desc *sd;
unsigned long *groups;
m = NLMSG_DATA(hdr);
pr_info("Collect netlink sock 0x%x\n", m->ndiag_ino);
sd = xmalloc(sizeof(*sd));
if (!sd)
return -1;
sd->protocol = m->ndiag_protocol;
sd->portid = m->ndiag_portid;
sd->dst_portid = m->ndiag_dst_portid;
sd->dst_group = m->ndiag_dst_group;
sd->state = m->ndiag_state;
parse_rtattr(tb, NETLINK_DIAG_MAX, (struct rtattr *)(m + 1),
hdr->nlmsg_len - NLMSG_LENGTH(sizeof(*m)));
if (tb[NETLINK_DIAG_GROUPS]) {
sd->gsize = RTA_PAYLOAD(tb[NETLINK_DIAG_GROUPS]);
groups = RTA_DATA(tb[NETLINK_DIAG_GROUPS]);
sd->groups = xmalloc(sd->gsize);
if (!sd->groups) {
xfree(sd);
return -1;
}
memcpy(sd->groups, groups, sd->gsize);
} else {
sd->groups = NULL;
sd->gsize = 0;
}
return sk_collect_one(m->ndiag_ino, PF_NETLINK, &sd->sd);
}
void show_netlinksk(int fd)
{
pb_show_plain(fd, PB_NETLINKSK);
}
static bool can_dump_netlink_sk(int lfd)
{
struct pollfd pfd = {lfd, POLLIN, 0};
int ret;
ret = poll(&pfd, 1, 0);
if (ret < 0) {
pr_perror("poll() failed");
} else if (ret == 1)
pr_err("The socket has data to read\n");
return ret == 0;
}
static int dump_one_netlink_fd(int lfd, u32 id, const struct fd_parms *p)
{
struct netlink_sk_desc *sk;
NetlinkSkEntry ne = NETLINK_SK_ENTRY__INIT;
SkOptsEntry skopts = SK_OPTS_ENTRY__INIT;
sk = (struct netlink_sk_desc *)lookup_socket(p->stat.st_ino, PF_NETLINK, 0);
if (IS_ERR(sk))
goto err;
ne.id = id;
ne.ino = p->stat.st_ino;
if (!can_dump_netlink_sk(lfd))
goto err;
if (sk) {
BUG_ON(sk->sd.already_dumped);
ne.protocol = sk->protocol;
ne.portid = sk->portid;
ne.groups = sk->groups;
ne.n_groups = sk->gsize / sizeof(ne.groups[0]);
/*
* On 64-bit sk->gsize is multiple to 8 bytes (sizeof(long)),
* so remove the last 4 bytes if they are empty.
*/
if (ne.n_groups && sk->groups[ne.n_groups - 1] == 0)
ne.n_groups -= 1;
if (ne.n_groups > 1) {
pr_err("%d %x\n", sk->gsize, sk->groups[1]);
pr_err("The netlink socket 0x%x has more than 32 groups\n", ne.ino);
return -1;
}
if (sk->groups && !sk->portid) {
pr_err("The netlink socket 0x%x is bound to groups but not to portid\n", ne.ino);
return -1;
}
ne.state = sk->state;
ne.dst_portid = sk->dst_portid;
ne.dst_group = sk->dst_group;
} else { /* unconnected and unbound socket */
int val;
socklen_t aux = sizeof(val);
if (getsockopt(lfd, SOL_SOCKET, SO_PROTOCOL, &val, &aux) < 0) {
pr_perror("Unable to get protocol for netlink socket");
goto err;
}
ne.protocol = val;
}
ne.fown = (FownEntry *)&p->fown;
ne.opts = &skopts;
if (dump_socket_opts(lfd, &skopts))
goto err;
if (pb_write_one(fdset_fd(glob_fdset, CR_FD_NETLINKSK), &ne, PB_NETLINKSK))
goto err;
return 0;
err:
return -1;
}
static const struct fdtype_ops netlink_dump_ops = {
.type = FD_TYPES__NETLINKSK,
.dump = dump_one_netlink_fd,
};
int dump_one_netlink(struct fd_parms *p, int lfd, const int fdinfo)
{
return do_dump_gen_file(p, lfd, &netlink_dump_ops, fdinfo);
}
struct netlink_sock_info {
NetlinkSkEntry *nse;
struct file_desc d;
};
static int open_netlink_sk(struct file_desc *d)
{
struct netlink_sock_info *nsi;
NetlinkSkEntry *nse;
struct sockaddr_nl addr;
int sk = -1;
nsi = container_of(d, struct netlink_sock_info, d);
nse = nsi->nse;
pr_info("Opening netlink socket id %#x\n", nse->id);
sk = socket(PF_NETLINK, SOCK_RAW, nse->protocol);
if (sk < 0) {
pr_perror("Can't create netlink sock");
goto err;
}
if (nse->portid) {
memset(&addr, 0, sizeof(addr));
addr.nl_family = AF_NETLINK;
if (nse->n_groups > 1) {
pr_err("Groups above 32 are not supported yet\n");
goto err;
}
if (nse->n_groups)
addr.nl_groups = nse->groups[0];
addr.nl_pid = nse->portid;
if (bind(sk, (struct sockaddr *)&addr, sizeof(addr)) < 0) {
pr_perror("Can't bind netlink socket");
goto err;
}
}
if (nse->state == NETLINK_CONNECTED) {
addr.nl_family = AF_NETLINK;
addr.nl_groups = 1 << (nse->dst_group - 1);
addr.nl_pid = nse->dst_portid;
if (connect(sk, (struct sockaddr *)&addr, sizeof(addr)) < 0) {
pr_perror("Can't connect netlink socket");
goto err;
}
}
if (rst_file_params(sk, nse->fown, nse->flags))
goto err;
if (restore_socket_opts(sk, nse->opts))
goto err;
return sk;
err:
close(sk);
return -1;
}
static struct file_desc_ops netlink_sock_desc_ops = {
.type = FD_TYPES__NETLINKSK,
.open = open_netlink_sk,
};
static int collect_one_netlink_sk(void *o, ProtobufCMessage *base)
{
struct netlink_sock_info *si = o;
si->nse = pb_msg(base, NetlinkSkEntry);
file_desc_add(&si->d, si->nse->id, &netlink_sock_desc_ops);
return 0;
}
int collect_netlink_sockets(void)
{
int ret = collect_image(CR_FD_NETLINKSK, PB_NETLINKSK,
sizeof(struct netlink_sock_info), collect_one_netlink_sk);
if (ret < 0 && errno == ENOENT)
return 0;
return ret;
}