#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/fcntl.h>
#include <linux/random.h>
#include <linux/slab.h>
#include <linux/cache.h>
#include <linux/init.h>
#include <linux/time.h>
#include <net/icmp.h>
#include <net/tcp.h>
#include <net/ipv6.h>
#include <net/inet_common.h>
#include <net/inet_connection_sock.h>
#include <net/bpf_sk_storage.h>
#include <net/netlink.h>
#include <linux/inet.h>
#include <linux/stddef.h>
#include <linux/inet_diag.h>
#include <linux/sock_diag.h>
static const struct inet_diag_handler __rcu **inet_diag_table;
struct inet_diag_entry {
const __be32 *saddr;
const __be32 *daddr;
u16 sport;
u16 dport;
u16 family;
u16 userlocks;
u32 ifindex;
u32 mark;
#ifdef CONFIG_SOCK_CGROUP_DATA
u64 cgroup_id;
#endif
};
static const struct inet_diag_handler *inet_diag_lock_handler(int proto)
{
const struct inet_diag_handler *handler;
if (proto < 0 || proto >= IPPROTO_MAX)
return NULL;
if (!READ_ONCE(inet_diag_table[proto]))
sock_load_diag_module(AF_INET, proto);
rcu_read_lock();
handler = rcu_dereference(inet_diag_table[proto]);
if (handler && !try_module_get(handler->owner))
handler = NULL;
rcu_read_unlock();
return handler;
}
static void inet_diag_unlock_handler(const struct inet_diag_handler *handler)
{
module_put(handler->owner);
}
void inet_diag_msg_common_fill(struct inet_diag_msg *r, struct sock *sk)
{
r->idiag_family = READ_ONCE(sk->sk_family);
r->id.idiag_sport = htons(READ_ONCE(sk->sk_num));
r->id.idiag_dport = READ_ONCE(sk->sk_dport);
r->id.idiag_if = READ_ONCE(sk->sk_bound_dev_if);
sock_diag_save_cookie(sk, r->id.idiag_cookie);
#if IS_ENABLED(CONFIG_IPV6)
if (r->idiag_family == AF_INET6) {
data_race(*(struct in6_addr *)r->id.idiag_src = sk->sk_v6_rcv_saddr);
data_race(*(struct in6_addr *)r->id.idiag_dst = sk->sk_v6_daddr);
} else
#endif
{
memset(&r->id.idiag_src, 0, sizeof(r->id.idiag_src));
memset(&r->id.idiag_dst, 0, sizeof(r->id.idiag_dst));
r->id.idiag_src[0] = READ_ONCE(sk->sk_rcv_saddr);
r->id.idiag_dst[0] = READ_ONCE(sk->sk_daddr);
}
}
EXPORT_SYMBOL_GPL(inet_diag_msg_common_fill);
int inet_diag_msg_attrs_fill(struct sock *sk, struct sk_buff *skb,
struct inet_diag_msg *r, int ext,
struct user_namespace *user_ns,
bool net_admin)
{
const struct inet_sock *inet = inet_sk(sk);
struct inet_diag_sockopt inet_sockopt;
if (nla_put_u8(skb, INET_DIAG_SHUTDOWN, sk->sk_shutdown))
goto errout;
if (ext & (1 << (INET_DIAG_TOS - 1)))
if (nla_put_u8(skb, INET_DIAG_TOS, READ_ONCE(inet->tos)) < 0)
goto errout;
#if IS_ENABLED(CONFIG_IPV6)
if (r->idiag_family == AF_INET6) {
if (ext & (1 << (INET_DIAG_TCLASS - 1)))
if (nla_put_u8(skb, INET_DIAG_TCLASS,
inet6_sk(sk)->tclass) < 0)
goto errout;
if (((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) &&
nla_put_u8(skb, INET_DIAG_SKV6ONLY, ipv6_only_sock(sk)))
goto errout;
}
#endif
if (net_admin && nla_put_u32(skb, INET_DIAG_MARK, READ_ONCE(sk->sk_mark)))
goto errout;
if (ext & (1 << (INET_DIAG_CLASS_ID - 1)) ||
ext & (1 << (INET_DIAG_TCLASS - 1))) {
u32 classid = 0;
#ifdef CONFIG_CGROUP_NET_CLASSID
classid = sock_cgroup_classid(&sk->sk_cgrp_data);
#endif
if (!classid)
classid = READ_ONCE(sk->sk_priority);
if (nla_put_u32(skb, INET_DIAG_CLASS_ID, classid))
goto errout;
}
#ifdef CONFIG_SOCK_CGROUP_DATA
if (nla_put_u64_64bit(skb, INET_DIAG_CGROUP_ID,
cgroup_id(sock_cgroup_ptr(&sk->sk_cgrp_data)),
INET_DIAG_PAD))
goto errout;
#endif
r->idiag_uid = from_kuid_munged(user_ns, sk_uid(sk));
r->idiag_inode = sock_i_ino(sk);
memset(&inet_sockopt, 0, sizeof(inet_sockopt));
inet_sockopt.recverr = inet_test_bit(RECVERR, sk);
inet_sockopt.is_icsk = inet_test_bit(IS_ICSK, sk);
inet_sockopt.freebind = inet_test_bit(FREEBIND, sk);
inet_sockopt.hdrincl = inet_test_bit(HDRINCL, sk);
inet_sockopt.mc_loop = inet_test_bit(MC_LOOP, sk);
inet_sockopt.transparent = inet_test_bit(TRANSPARENT, sk);
inet_sockopt.mc_all = inet_test_bit(MC_ALL, sk);
inet_sockopt.nodefrag = inet_test_bit(NODEFRAG, sk);
inet_sockopt.bind_address_no_port = inet_test_bit(BIND_ADDRESS_NO_PORT, sk);
inet_sockopt.recverr_rfc4884 = inet_test_bit(RECVERR_RFC4884, sk);
inet_sockopt.defer_connect = inet_test_bit(DEFER_CONNECT, sk);
if (nla_put(skb, INET_DIAG_SOCKOPT, sizeof(inet_sockopt),
&inet_sockopt))
goto errout;
return 0;
errout:
return 1;
}
EXPORT_SYMBOL_GPL(inet_diag_msg_attrs_fill);
static int inet_diag_parse_attrs(const struct nlmsghdr *nlh, int hdrlen,
struct nlattr **req_nlas)
{
struct nlattr *nla;
int remaining;
nlmsg_for_each_attr(nla, nlh, hdrlen, remaining) {
int type = nla_type(nla);
if (type == INET_DIAG_REQ_PROTOCOL && nla_len(nla) != sizeof(u32))
return -EINVAL;
if (type < __INET_DIAG_REQ_MAX)
req_nlas[type] = nla;
}
return 0;
}
static int inet_diag_get_protocol(const struct inet_diag_req_v2 *req,
const struct inet_diag_dump_data *data)
{
if (data->req_nlas[INET_DIAG_REQ_PROTOCOL])
return nla_get_u32(data->req_nlas[INET_DIAG_REQ_PROTOCOL]);
return req->sdiag_protocol;
}
#define MAX_DUMP_ALLOC_SIZE (KMALLOC_MAX_SIZE - SKB_DATA_ALIGN(sizeof(struct skb_shared_info)))
int inet_sk_diag_fill(struct sock *sk, struct inet_connection_sock *icsk,
struct sk_buff *skb, struct netlink_callback *cb,
const struct inet_diag_req_v2 *req,
u16 nlmsg_flags, bool net_admin)
{
const struct tcp_congestion_ops *ca_ops;
const struct inet_diag_handler *handler;
struct inet_diag_dump_data *cb_data;
int ext = req->idiag_ext;
struct inet_diag_msg *r;
struct nlmsghdr *nlh;
struct nlattr *attr;
void *info = NULL;
u8 icsk_pending;
int protocol;
cb_data = cb->data;
protocol = inet_diag_get_protocol(req, cb_data);
handler = rcu_dereference_protected(inet_diag_table[protocol], 1);
DEBUG_NET_WARN_ON_ONCE(!handler);
if (!handler)
return -ENXIO;
nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
cb->nlh->nlmsg_type, sizeof(*r), nlmsg_flags);
if (!nlh)
return -EMSGSIZE;
r = nlmsg_data(nlh);
BUG_ON(!sk_fullsock(sk));
inet_diag_msg_common_fill(r, sk);
r->idiag_state = sk->sk_state;
r->idiag_timer = IDIAG_TIMER_OFF;
r->idiag_retrans = 0;
r->idiag_expires = 0;
if (inet_diag_msg_attrs_fill(sk, skb, r, ext,
sk_user_ns(NETLINK_CB(cb->skb).sk),
net_admin))
goto errout;
if (ext & (1 << (INET_DIAG_MEMINFO - 1))) {
struct inet_diag_meminfo minfo = {
.idiag_rmem = sk_rmem_alloc_get(sk),
.idiag_wmem = READ_ONCE(sk->sk_wmem_queued),
.idiag_fmem = READ_ONCE(sk->sk_forward_alloc),
.idiag_tmem = sk_wmem_alloc_get(sk),
};
if (nla_put(skb, INET_DIAG_MEMINFO, sizeof(minfo), &minfo) < 0)
goto errout;
}
if (ext & (1 << (INET_DIAG_SKMEMINFO - 1)))
if (sock_diag_put_meminfo(sk, skb, INET_DIAG_SKMEMINFO))
goto errout;
if (sk->sk_type == SOCK_RAW) {
if (nla_put_u8(skb, INET_DIAG_PROTOCOL, sk->sk_protocol))
goto errout;
}
if (!icsk) {
handler->idiag_get_info(sk, r, NULL);
goto out;
}
icsk_pending = smp_load_acquire(&icsk->icsk_pending);
if (icsk_pending == ICSK_TIME_RETRANS ||
icsk_pending == ICSK_TIME_REO_TIMEOUT ||
icsk_pending == ICSK_TIME_LOSS_PROBE) {
r->idiag_timer = IDIAG_TIMER_ON;
r->idiag_retrans = READ_ONCE(icsk->icsk_retransmits);
r->idiag_expires =
jiffies_delta_to_msecs(tcp_timeout_expires(sk) - jiffies);
} else if (icsk_pending == ICSK_TIME_PROBE0) {
r->idiag_timer = IDIAG_TIMER_PROBE0;
r->idiag_retrans = READ_ONCE(icsk->icsk_probes_out);
r->idiag_expires =
jiffies_delta_to_msecs(tcp_timeout_expires(sk) - jiffies);
} else if (timer_pending(&icsk->icsk_keepalive_timer)) {
r->idiag_timer = IDIAG_TIMER_KEEPALIVE;
r->idiag_retrans = READ_ONCE(icsk->icsk_probes_out);
r->idiag_expires =
jiffies_delta_to_msecs(icsk->icsk_keepalive_timer.expires - jiffies);
} else if ((READ_ONCE(icsk->icsk_ack.pending) & ICSK_ACK_TIMER) &&
timer_pending(&icsk->icsk_delack_timer)) {
r->idiag_timer = IDIAG_TIMER_DELACK;
r->idiag_expires =
jiffies_delta_to_msecs(icsk_delack_timeout(icsk) - jiffies);
}
if ((ext & (1 << (INET_DIAG_INFO - 1))) && handler->idiag_info_size) {
attr = nla_reserve_64bit(skb, INET_DIAG_INFO,
handler->idiag_info_size,
INET_DIAG_PAD);
if (!attr)
goto errout;
info = nla_data(attr);
}
if (ext & (1 << (INET_DIAG_CONG - 1))) {
int err = 0;
rcu_read_lock();
ca_ops = READ_ONCE(icsk->icsk_ca_ops);
if (ca_ops)
err = nla_put_string(skb, INET_DIAG_CONG, ca_ops->name);
rcu_read_unlock();
if (err < 0)
goto errout;
}
handler->idiag_get_info(sk, r, info);
if (ext & (1 << (INET_DIAG_INFO - 1)) && handler->idiag_get_aux)
if (handler->idiag_get_aux(sk, net_admin, skb) < 0)
goto errout;
if (sk->sk_state < TCP_TIME_WAIT) {
union tcp_cc_info info;
size_t sz = 0;
int attr;
rcu_read_lock();
ca_ops = READ_ONCE(icsk->icsk_ca_ops);
if (ca_ops && ca_ops->get_info)
sz = ca_ops->get_info(sk, ext, &attr, &info);
rcu_read_unlock();
if (sz && nla_put(skb, attr, sz, &info) < 0)
goto errout;
}
if (cb_data->bpf_stg_diag) {
bool first_nlmsg = ((unsigned char *)nlh == skb->data);
unsigned int prev_min_dump_alloc;
unsigned int total_nla_size = 0;
unsigned int msg_len;
int err;
msg_len = skb_tail_pointer(skb) - (unsigned char *)nlh;
err = bpf_sk_storage_diag_put(cb_data->bpf_stg_diag, sk, skb,
INET_DIAG_SK_BPF_STORAGES,
&total_nla_size);
if (!err)
goto out;
total_nla_size += msg_len;
prev_min_dump_alloc = cb->min_dump_alloc;
if (total_nla_size > prev_min_dump_alloc)
cb->min_dump_alloc = min_t(u32, total_nla_size,
MAX_DUMP_ALLOC_SIZE);
if (!first_nlmsg)
goto errout;
if (cb->min_dump_alloc > prev_min_dump_alloc)
goto errout;
WARN_ON_ONCE(total_nla_size <= prev_min_dump_alloc);
}
out:
nlmsg_end(skb, nlh);
return 0;
errout:
nlmsg_cancel(skb, nlh);
return -EMSGSIZE;
}
EXPORT_SYMBOL_GPL(inet_sk_diag_fill);
static int inet_diag_cmd_exact(int cmd, struct sk_buff *in_skb,
const struct nlmsghdr *nlh,
int hdrlen,
const struct inet_diag_req_v2 *req)
{
const struct inet_diag_handler *handler;
struct inet_diag_dump_data dump_data;
int err, protocol;
memset(&dump_data, 0, sizeof(dump_data));
err = inet_diag_parse_attrs(nlh, hdrlen, dump_data.req_nlas);
if (err)
return err;
protocol = inet_diag_get_protocol(req, &dump_data);
handler = inet_diag_lock_handler(protocol);
if (!handler)
return -ENOENT;
if (cmd == SOCK_DIAG_BY_FAMILY) {
struct netlink_callback cb = {
.nlh = nlh,
.skb = in_skb,
.data = &dump_data,
};
err = handler->dump_one(&cb, req);
} else if (cmd == SOCK_DESTROY && handler->destroy) {
err = handler->destroy(in_skb, req);
} else {
err = -EOPNOTSUPP;
}
inet_diag_unlock_handler(handler);
return err;
}
static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits)
{
int words = bits >> 5;
bits &= 0x1f;
if (words) {
if (memcmp(a1, a2, words << 2))
return 0;
}
if (bits) {
__be32 w1, w2;
__be32 mask;
w1 = a1[words];
w2 = a2[words];
mask = htonl((0xffffffff) << (32 - bits));
if ((w1 ^ w2) & mask)
return 0;
}
return 1;
}
static int inet_diag_bc_run(const struct nlattr *_bc,
const struct inet_diag_entry *entry)
{
const void *bc = nla_data(_bc);
int len = nla_len(_bc);
while (len > 0) {
int yes = 1;
const struct inet_diag_bc_op *op = bc;
switch (op->code) {
case INET_DIAG_BC_NOP:
break;
case INET_DIAG_BC_JMP:
yes = 0;
break;
case INET_DIAG_BC_S_EQ:
yes = entry->sport == op[1].no;
break;
case INET_DIAG_BC_S_GE:
yes = entry->sport >= op[1].no;
break;
case INET_DIAG_BC_S_LE:
yes = entry->sport <= op[1].no;
break;
case INET_DIAG_BC_D_EQ:
yes = entry->dport == op[1].no;
break;
case INET_DIAG_BC_D_GE:
yes = entry->dport >= op[1].no;
break;
case INET_DIAG_BC_D_LE:
yes = entry->dport <= op[1].no;
break;
case INET_DIAG_BC_AUTO:
yes = !(entry->userlocks & SOCK_BINDPORT_LOCK);
break;
case INET_DIAG_BC_S_COND:
case INET_DIAG_BC_D_COND: {
const struct inet_diag_hostcond *cond;
const __be32 *addr;
cond = (const struct inet_diag_hostcond *)(op + 1);
if (cond->port != -1 &&
cond->port != (op->code == INET_DIAG_BC_S_COND ?
entry->sport : entry->dport)) {
yes = 0;
break;
}
if (op->code == INET_DIAG_BC_S_COND)
addr = entry->saddr;
else
addr = entry->daddr;
if (cond->family != AF_UNSPEC &&
cond->family != entry->family) {
if (entry->family == AF_INET6 &&
cond->family == AF_INET) {
if (addr[0] == 0 && addr[1] == 0 &&
addr[2] == htonl(0xffff) &&
bitstring_match(addr + 3,
cond->addr,
cond->prefix_len))
break;
}
yes = 0;
break;
}
if (cond->prefix_len == 0)
break;
if (bitstring_match(addr, cond->addr,
cond->prefix_len))
break;
yes = 0;
break;
}
case INET_DIAG_BC_DEV_COND: {
u32 ifindex;
ifindex = *((const u32 *)(op + 1));
if (ifindex != entry->ifindex)
yes = 0;
break;
}
case INET_DIAG_BC_MARK_COND: {
struct inet_diag_markcond *cond;
cond = (struct inet_diag_markcond *)(op + 1);
if ((entry->mark & cond->mask) != cond->mark)
yes = 0;
break;
}
#ifdef CONFIG_SOCK_CGROUP_DATA
case INET_DIAG_BC_CGROUP_COND: {
u64 cgroup_id;
cgroup_id = get_unaligned((const u64 *)(op + 1));
if (cgroup_id != entry->cgroup_id)
yes = 0;
break;
}
#endif
}
if (yes) {
len -= op->yes;
bc += op->yes;
} else {
len -= op->no;
bc += op->no;
}
}
return len == 0;
}
static void entry_fill_addrs(struct inet_diag_entry *entry,
const struct sock *sk)
{
#if IS_ENABLED(CONFIG_IPV6)
if (entry->family == AF_INET6) {
entry->saddr = sk->sk_v6_rcv_saddr.s6_addr32;
entry->daddr = sk->sk_v6_daddr.s6_addr32;
} else
#endif
{
entry->saddr = &sk->sk_rcv_saddr;
entry->daddr = &sk->sk_daddr;
}
}
int inet_diag_bc_sk(const struct inet_diag_dump_data *cb_data, struct sock *sk)
{
const struct nlattr *bc = cb_data->inet_diag_nla_bc;
const struct inet_sock *inet = inet_sk(sk);
struct inet_diag_entry entry;
if (!bc)
return 1;
entry.family = READ_ONCE(sk->sk_family);
entry_fill_addrs(&entry, sk);
entry.sport = READ_ONCE(inet->inet_num);
entry.dport = ntohs(READ_ONCE(inet->inet_dport));
entry.ifindex = READ_ONCE(sk->sk_bound_dev_if);
if (cb_data->userlocks_needed)
entry.userlocks = sk_fullsock(sk) ? READ_ONCE(sk->sk_userlocks) : 0;
if (cb_data->mark_needed) {
if (sk_fullsock(sk))
entry.mark = READ_ONCE(sk->sk_mark);
else if (sk->sk_state == TCP_NEW_SYN_RECV)
entry.mark = inet_rsk(inet_reqsk(sk))->ir_mark;
else if (sk->sk_state == TCP_TIME_WAIT)
entry.mark = inet_twsk(sk)->tw_mark;
else
entry.mark = 0;
}
#ifdef CONFIG_SOCK_CGROUP_DATA
if (cb_data->cgroup_needed)
entry.cgroup_id = sk_fullsock(sk) ?
cgroup_id(sock_cgroup_ptr(&sk->sk_cgrp_data)) : 0;
#endif
return inet_diag_bc_run(bc, &entry);
}
EXPORT_SYMBOL_GPL(inet_diag_bc_sk);
static int valid_cc(const void *bc, int len, int cc)
{
while (len >= 0) {
const struct inet_diag_bc_op *op = bc;
if (cc > len)
return 0;
if (cc == len)
return 1;
if (op->yes < 4 || op->yes & 3)
return 0;
len -= op->yes;
bc += op->yes;
}
return 0;
}
static bool valid_devcond(const struct inet_diag_bc_op *op, int len,
int *min_len)
{
*min_len += sizeof(u32);
if (len < *min_len)
return false;
return true;
}
static bool valid_hostcond(const struct inet_diag_bc_op *op, int len,
int *min_len)
{
struct inet_diag_hostcond *cond;
int addr_len;
*min_len += sizeof(struct inet_diag_hostcond);
if (len < *min_len)
return false;
cond = (struct inet_diag_hostcond *)(op + 1);
switch (cond->family) {
case AF_UNSPEC:
addr_len = 0;
break;
case AF_INET:
addr_len = sizeof(struct in_addr);
break;
case AF_INET6:
addr_len = sizeof(struct in6_addr);
break;
default:
return false;
}
*min_len += addr_len;
if (len < *min_len)
return false;
if (cond->prefix_len > 8 * addr_len)
return false;
return true;
}
static bool valid_port_comparison(const struct inet_diag_bc_op *op,
int len, int *min_len)
{
*min_len += sizeof(struct inet_diag_bc_op);
if (len < *min_len)
return false;
return true;
}
static bool valid_markcond(const struct inet_diag_bc_op *op, int len,
int *min_len)
{
*min_len += sizeof(struct inet_diag_markcond);
return len >= *min_len;
}
#ifdef CONFIG_SOCK_CGROUP_DATA
static bool valid_cgroupcond(const struct inet_diag_bc_op *op, int len,
int *min_len)
{
*min_len += sizeof(u64);
return len >= *min_len;
}
#endif
static int inet_diag_bc_audit(struct inet_diag_dump_data *cb_data,
const struct sk_buff *skb)
{
const struct nlattr *attr = cb_data->inet_diag_nla_bc;
const void *bytecode, *bc;
int bytecode_len, len;
bool net_admin;
if (!attr)
return 0;
if (nla_len(attr) < sizeof(struct inet_diag_bc_op))
return -EINVAL;
net_admin = netlink_net_capable(skb, CAP_NET_ADMIN);
bytecode = bc = nla_data(attr);
len = bytecode_len = nla_len(attr);
while (len > 0) {
int min_len = sizeof(struct inet_diag_bc_op);
const struct inet_diag_bc_op *op = bc;
switch (op->code) {
case INET_DIAG_BC_S_COND:
case INET_DIAG_BC_D_COND:
if (!valid_hostcond(bc, len, &min_len))
return -EINVAL;
break;
case INET_DIAG_BC_DEV_COND:
if (!valid_devcond(bc, len, &min_len))
return -EINVAL;
break;
case INET_DIAG_BC_S_EQ:
case INET_DIAG_BC_S_GE:
case INET_DIAG_BC_S_LE:
case INET_DIAG_BC_D_EQ:
case INET_DIAG_BC_D_GE:
case INET_DIAG_BC_D_LE:
if (!valid_port_comparison(bc, len, &min_len))
return -EINVAL;
break;
case INET_DIAG_BC_MARK_COND:
if (!net_admin)
return -EPERM;
if (!valid_markcond(bc, len, &min_len))
return -EINVAL;
cb_data->mark_needed = true;
break;
#ifdef CONFIG_SOCK_CGROUP_DATA
case INET_DIAG_BC_CGROUP_COND:
if (!valid_cgroupcond(bc, len, &min_len))
return -EINVAL;
cb_data->cgroup_needed = true;
break;
#endif
case INET_DIAG_BC_AUTO:
cb_data->userlocks_needed = true;
fallthrough;
case INET_DIAG_BC_JMP:
case INET_DIAG_BC_NOP:
break;
default:
return -EINVAL;
}
if (op->code != INET_DIAG_BC_NOP) {
if (op->no < min_len || op->no > len + 4 || op->no & 3)
return -EINVAL;
if (op->no < len &&
!valid_cc(bytecode, bytecode_len, len - op->no))
return -EINVAL;
}
if (op->yes < min_len || op->yes > len + 4 || op->yes & 3)
return -EINVAL;
bc += op->yes;
len -= op->yes;
}
return len == 0 ? 0 : -EINVAL;
}
static int __inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
const struct inet_diag_req_v2 *r)
{
struct inet_diag_dump_data *cb_data = cb->data;
const struct inet_diag_handler *handler;
u32 prev_min_dump_alloc;
int protocol, err = 0;
protocol = inet_diag_get_protocol(r, cb_data);
again:
prev_min_dump_alloc = cb->min_dump_alloc;
handler = inet_diag_lock_handler(protocol);
if (handler) {
handler->dump(skb, cb, r);
inet_diag_unlock_handler(handler);
} else {
err = -ENOENT;
}
if (!skb->len && cb->min_dump_alloc > prev_min_dump_alloc) {
err = pskb_expand_head(skb, 0, cb->min_dump_alloc, GFP_KERNEL);
if (!err)
goto again;
}
return err ? : skb->len;
}
static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
{
return __inet_diag_dump(skb, cb, nlmsg_data(cb->nlh));
}
static int __inet_diag_dump_start(struct netlink_callback *cb, int hdrlen)
{
const struct nlmsghdr *nlh = cb->nlh;
struct inet_diag_dump_data *cb_data;
struct sk_buff *skb = cb->skb;
struct nlattr *nla;
int err;
cb_data = kzalloc_obj(*cb_data);
if (!cb_data)
return -ENOMEM;
err = inet_diag_parse_attrs(nlh, hdrlen, cb_data->req_nlas);
if (err) {
kfree(cb_data);
return err;
}
err = inet_diag_bc_audit(cb_data, skb);
if (err) {
kfree(cb_data);
return err;
}
nla = cb_data->inet_diag_nla_bpf_stgs;
if (nla) {
struct bpf_sk_storage_diag *bpf_stg_diag;
bpf_stg_diag = bpf_sk_storage_diag_alloc(nla);
if (IS_ERR(bpf_stg_diag)) {
kfree(cb_data);
return PTR_ERR(bpf_stg_diag);
}
cb_data->bpf_stg_diag = bpf_stg_diag;
}
cb->data = cb_data;
return 0;
}
static int inet_diag_dump_start(struct netlink_callback *cb)
{
return __inet_diag_dump_start(cb, sizeof(struct inet_diag_req_v2));
}
static int inet_diag_dump_start_compat(struct netlink_callback *cb)
{
return __inet_diag_dump_start(cb, sizeof(struct inet_diag_req));
}
static int inet_diag_dump_done(struct netlink_callback *cb)
{
struct inet_diag_dump_data *cb_data = cb->data;
bpf_sk_storage_diag_free(cb_data->bpf_stg_diag);
kfree(cb->data);
return 0;
}
static int inet_diag_type2proto(int type)
{
switch (type) {
case TCPDIAG_GETSOCK:
return IPPROTO_TCP;
default:
return 0;
}
}
static int inet_diag_dump_compat(struct sk_buff *skb,
struct netlink_callback *cb)
{
struct inet_diag_req *rc = nlmsg_data(cb->nlh);
struct inet_diag_req_v2 req;
req.sdiag_family = AF_UNSPEC;
req.sdiag_protocol = inet_diag_type2proto(cb->nlh->nlmsg_type);
req.idiag_ext = rc->idiag_ext;
req.pad = 0;
req.idiag_states = rc->idiag_states;
req.id = rc->id;
return __inet_diag_dump(skb, cb, &req);
}
static int inet_diag_get_exact_compat(struct sk_buff *in_skb,
const struct nlmsghdr *nlh)
{
struct inet_diag_req *rc = nlmsg_data(nlh);
struct inet_diag_req_v2 req;
req.sdiag_family = rc->idiag_family;
req.sdiag_protocol = inet_diag_type2proto(nlh->nlmsg_type);
req.idiag_ext = rc->idiag_ext;
req.pad = 0;
req.idiag_states = rc->idiag_states;
req.id = rc->id;
return inet_diag_cmd_exact(SOCK_DIAG_BY_FAMILY, in_skb, nlh,
sizeof(struct inet_diag_req), &req);
}
static int inet_diag_rcv_msg_compat(struct sk_buff *skb, struct nlmsghdr *nlh)
{
int hdrlen = sizeof(struct inet_diag_req);
struct net *net = sock_net(skb->sk);
if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX ||
nlmsg_len(nlh) < hdrlen)
return -EINVAL;
if (nlh->nlmsg_flags & NLM_F_DUMP) {
struct netlink_dump_control c = {
.start = inet_diag_dump_start_compat,
.done = inet_diag_dump_done,
.dump = inet_diag_dump_compat,
};
return netlink_dump_start(net->diag_nlsk, skb, nlh, &c);
}
return inet_diag_get_exact_compat(skb, nlh);
}
static int inet_diag_handler_cmd(struct sk_buff *skb, struct nlmsghdr *h)
{
int hdrlen = sizeof(struct inet_diag_req_v2);
struct net *net = sock_net(skb->sk);
if (nlmsg_len(h) < hdrlen)
return -EINVAL;
if (h->nlmsg_type == SOCK_DIAG_BY_FAMILY &&
h->nlmsg_flags & NLM_F_DUMP) {
struct netlink_dump_control c = {
.start = inet_diag_dump_start,
.done = inet_diag_dump_done,
.dump = inet_diag_dump,
};
return netlink_dump_start(net->diag_nlsk, skb, h, &c);
}
return inet_diag_cmd_exact(h->nlmsg_type, skb, h, hdrlen,
nlmsg_data(h));
}
static
int inet_diag_handler_get_info(struct sk_buff *skb, struct sock *sk)
{
const struct inet_diag_handler *handler;
struct nlmsghdr *nlh;
struct nlattr *attr;
struct inet_diag_msg *r;
void *info = NULL;
int err = 0;
nlh = nlmsg_put(skb, 0, 0, SOCK_DIAG_BY_FAMILY, sizeof(*r), 0);
if (!nlh)
return -ENOMEM;
r = nlmsg_data(nlh);
memset(r, 0, sizeof(*r));
inet_diag_msg_common_fill(r, sk);
if (sk->sk_type == SOCK_DGRAM || sk->sk_type == SOCK_STREAM)
r->id.idiag_sport = inet_sk(sk)->inet_sport;
r->idiag_state = sk->sk_state;
if ((err = nla_put_u8(skb, INET_DIAG_PROTOCOL, sk->sk_protocol))) {
nlmsg_cancel(skb, nlh);
return err;
}
handler = inet_diag_lock_handler(sk->sk_protocol);
if (!handler) {
nlmsg_cancel(skb, nlh);
return -ENOENT;
}
attr = handler->idiag_info_size
? nla_reserve_64bit(skb, INET_DIAG_INFO,
handler->idiag_info_size,
INET_DIAG_PAD)
: NULL;
if (attr)
info = nla_data(attr);
handler->idiag_get_info(sk, r, info);
inet_diag_unlock_handler(handler);
nlmsg_end(skb, nlh);
return 0;
}
static const struct sock_diag_handler inet_diag_handler = {
.owner = THIS_MODULE,
.family = AF_INET,
.dump = inet_diag_handler_cmd,
.get_info = inet_diag_handler_get_info,
.destroy = inet_diag_handler_cmd,
};
static const struct sock_diag_handler inet6_diag_handler = {
.owner = THIS_MODULE,
.family = AF_INET6,
.dump = inet_diag_handler_cmd,
.get_info = inet_diag_handler_get_info,
.destroy = inet_diag_handler_cmd,
};
int inet_diag_register(const struct inet_diag_handler *h)
{
const __u16 type = h->idiag_type;
if (type >= IPPROTO_MAX)
return -EINVAL;
return !cmpxchg((const struct inet_diag_handler **)&inet_diag_table[type],
NULL, h) ? 0 : -EEXIST;
}
EXPORT_SYMBOL_GPL(inet_diag_register);
void inet_diag_unregister(const struct inet_diag_handler *h)
{
const __u16 type = h->idiag_type;
if (type >= IPPROTO_MAX)
return;
xchg((const struct inet_diag_handler **)&inet_diag_table[type],
NULL);
}
EXPORT_SYMBOL_GPL(inet_diag_unregister);
static const struct sock_diag_inet_compat inet_diag_compat = {
.owner = THIS_MODULE,
.fn = inet_diag_rcv_msg_compat,
};
static int __init inet_diag_init(void)
{
const int inet_diag_table_size = (IPPROTO_MAX *
sizeof(struct inet_diag_handler *));
int err = -ENOMEM;
inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL);
if (!inet_diag_table)
goto out;
err = sock_diag_register(&inet_diag_handler);
if (err)
goto out_free_nl;
err = sock_diag_register(&inet6_diag_handler);
if (err)
goto out_free_inet;
sock_diag_register_inet_compat(&inet_diag_compat);
out:
return err;
out_free_inet:
sock_diag_unregister(&inet_diag_handler);
out_free_nl:
kfree(inet_diag_table);
goto out;
}
static void __exit inet_diag_exit(void)
{
sock_diag_unregister(&inet6_diag_handler);
sock_diag_unregister(&inet_diag_handler);
sock_diag_unregister_inet_compat(&inet_diag_compat);
kfree(inet_diag_table);
}
module_init(inet_diag_init);
module_exit(inet_diag_exit);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("INET/INET6: socket monitoring via SOCK_DIAG");
MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2 );
MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 10 );
