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339 lines
7.8 KiB
339 lines
7.8 KiB
/* License: GPL */ |
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#include <linux/mutex.h> |
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#include <linux/socket.h> |
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#include <linux/skbuff.h> |
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#include <net/netlink.h> |
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#include <net/net_namespace.h> |
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#include <linux/module.h> |
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#include <net/sock.h> |
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#include <linux/kernel.h> |
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#include <linux/tcp.h> |
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#include <linux/workqueue.h> |
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#include <linux/nospec.h> |
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#include <linux/cookie.h> |
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#include <linux/inet_diag.h> |
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#include <linux/sock_diag.h> |
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static const struct sock_diag_handler *sock_diag_handlers[AF_MAX]; |
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static int (*inet_rcv_compat)(struct sk_buff *skb, struct nlmsghdr *nlh); |
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static DEFINE_MUTEX(sock_diag_table_mutex); |
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static struct workqueue_struct *broadcast_wq; |
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DEFINE_COOKIE(sock_cookie); |
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u64 __sock_gen_cookie(struct sock *sk) |
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{ |
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while (1) { |
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u64 res = atomic64_read(&sk->sk_cookie); |
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if (res) |
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return res; |
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res = gen_cookie_next(&sock_cookie); |
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atomic64_cmpxchg(&sk->sk_cookie, 0, res); |
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} |
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} |
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int sock_diag_check_cookie(struct sock *sk, const __u32 *cookie) |
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{ |
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u64 res; |
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if (cookie[0] == INET_DIAG_NOCOOKIE && cookie[1] == INET_DIAG_NOCOOKIE) |
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return 0; |
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res = sock_gen_cookie(sk); |
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if ((u32)res != cookie[0] || (u32)(res >> 32) != cookie[1]) |
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return -ESTALE; |
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return 0; |
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} |
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EXPORT_SYMBOL_GPL(sock_diag_check_cookie); |
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void sock_diag_save_cookie(struct sock *sk, __u32 *cookie) |
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{ |
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u64 res = sock_gen_cookie(sk); |
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cookie[0] = (u32)res; |
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cookie[1] = (u32)(res >> 32); |
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} |
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EXPORT_SYMBOL_GPL(sock_diag_save_cookie); |
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int sock_diag_put_meminfo(struct sock *sk, struct sk_buff *skb, int attrtype) |
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{ |
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u32 mem[SK_MEMINFO_VARS]; |
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sk_get_meminfo(sk, mem); |
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return nla_put(skb, attrtype, sizeof(mem), &mem); |
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} |
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EXPORT_SYMBOL_GPL(sock_diag_put_meminfo); |
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int sock_diag_put_filterinfo(bool may_report_filterinfo, struct sock *sk, |
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struct sk_buff *skb, int attrtype) |
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{ |
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struct sock_fprog_kern *fprog; |
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struct sk_filter *filter; |
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struct nlattr *attr; |
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unsigned int flen; |
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int err = 0; |
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if (!may_report_filterinfo) { |
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nla_reserve(skb, attrtype, 0); |
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return 0; |
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} |
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rcu_read_lock(); |
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filter = rcu_dereference(sk->sk_filter); |
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if (!filter) |
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goto out; |
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fprog = filter->prog->orig_prog; |
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if (!fprog) |
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goto out; |
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flen = bpf_classic_proglen(fprog); |
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attr = nla_reserve(skb, attrtype, flen); |
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if (attr == NULL) { |
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err = -EMSGSIZE; |
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goto out; |
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} |
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memcpy(nla_data(attr), fprog->filter, flen); |
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out: |
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rcu_read_unlock(); |
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return err; |
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} |
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EXPORT_SYMBOL(sock_diag_put_filterinfo); |
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struct broadcast_sk { |
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struct sock *sk; |
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struct work_struct work; |
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}; |
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static size_t sock_diag_nlmsg_size(void) |
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{ |
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return NLMSG_ALIGN(sizeof(struct inet_diag_msg) |
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+ nla_total_size(sizeof(u8)) /* INET_DIAG_PROTOCOL */ |
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+ nla_total_size_64bit(sizeof(struct tcp_info))); /* INET_DIAG_INFO */ |
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} |
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static void sock_diag_broadcast_destroy_work(struct work_struct *work) |
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{ |
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struct broadcast_sk *bsk = |
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container_of(work, struct broadcast_sk, work); |
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struct sock *sk = bsk->sk; |
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const struct sock_diag_handler *hndl; |
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struct sk_buff *skb; |
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const enum sknetlink_groups group = sock_diag_destroy_group(sk); |
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int err = -1; |
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WARN_ON(group == SKNLGRP_NONE); |
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skb = nlmsg_new(sock_diag_nlmsg_size(), GFP_KERNEL); |
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if (!skb) |
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goto out; |
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mutex_lock(&sock_diag_table_mutex); |
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hndl = sock_diag_handlers[sk->sk_family]; |
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if (hndl && hndl->get_info) |
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err = hndl->get_info(skb, sk); |
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mutex_unlock(&sock_diag_table_mutex); |
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if (!err) |
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nlmsg_multicast(sock_net(sk)->diag_nlsk, skb, 0, group, |
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GFP_KERNEL); |
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else |
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kfree_skb(skb); |
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out: |
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sk_destruct(sk); |
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kfree(bsk); |
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} |
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void sock_diag_broadcast_destroy(struct sock *sk) |
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{ |
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/* Note, this function is often called from an interrupt context. */ |
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struct broadcast_sk *bsk = |
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kmalloc(sizeof(struct broadcast_sk), GFP_ATOMIC); |
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if (!bsk) |
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return sk_destruct(sk); |
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bsk->sk = sk; |
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INIT_WORK(&bsk->work, sock_diag_broadcast_destroy_work); |
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queue_work(broadcast_wq, &bsk->work); |
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} |
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void sock_diag_register_inet_compat(int (*fn)(struct sk_buff *skb, struct nlmsghdr *nlh)) |
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{ |
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mutex_lock(&sock_diag_table_mutex); |
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inet_rcv_compat = fn; |
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mutex_unlock(&sock_diag_table_mutex); |
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} |
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EXPORT_SYMBOL_GPL(sock_diag_register_inet_compat); |
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void sock_diag_unregister_inet_compat(int (*fn)(struct sk_buff *skb, struct nlmsghdr *nlh)) |
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{ |
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mutex_lock(&sock_diag_table_mutex); |
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inet_rcv_compat = NULL; |
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mutex_unlock(&sock_diag_table_mutex); |
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} |
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EXPORT_SYMBOL_GPL(sock_diag_unregister_inet_compat); |
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int sock_diag_register(const struct sock_diag_handler *hndl) |
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{ |
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int err = 0; |
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if (hndl->family >= AF_MAX) |
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return -EINVAL; |
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mutex_lock(&sock_diag_table_mutex); |
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if (sock_diag_handlers[hndl->family]) |
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err = -EBUSY; |
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else |
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sock_diag_handlers[hndl->family] = hndl; |
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mutex_unlock(&sock_diag_table_mutex); |
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return err; |
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} |
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EXPORT_SYMBOL_GPL(sock_diag_register); |
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void sock_diag_unregister(const struct sock_diag_handler *hnld) |
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{ |
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int family = hnld->family; |
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if (family >= AF_MAX) |
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return; |
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mutex_lock(&sock_diag_table_mutex); |
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BUG_ON(sock_diag_handlers[family] != hnld); |
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sock_diag_handlers[family] = NULL; |
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mutex_unlock(&sock_diag_table_mutex); |
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} |
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EXPORT_SYMBOL_GPL(sock_diag_unregister); |
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static int __sock_diag_cmd(struct sk_buff *skb, struct nlmsghdr *nlh) |
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{ |
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int err; |
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struct sock_diag_req *req = nlmsg_data(nlh); |
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const struct sock_diag_handler *hndl; |
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if (nlmsg_len(nlh) < sizeof(*req)) |
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return -EINVAL; |
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if (req->sdiag_family >= AF_MAX) |
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return -EINVAL; |
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req->sdiag_family = array_index_nospec(req->sdiag_family, AF_MAX); |
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if (sock_diag_handlers[req->sdiag_family] == NULL) |
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sock_load_diag_module(req->sdiag_family, 0); |
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mutex_lock(&sock_diag_table_mutex); |
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hndl = sock_diag_handlers[req->sdiag_family]; |
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if (hndl == NULL) |
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err = -ENOENT; |
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else if (nlh->nlmsg_type == SOCK_DIAG_BY_FAMILY) |
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err = hndl->dump(skb, nlh); |
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else if (nlh->nlmsg_type == SOCK_DESTROY && hndl->destroy) |
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err = hndl->destroy(skb, nlh); |
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else |
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err = -EOPNOTSUPP; |
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mutex_unlock(&sock_diag_table_mutex); |
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return err; |
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} |
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static int sock_diag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, |
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struct netlink_ext_ack *extack) |
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{ |
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int ret; |
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switch (nlh->nlmsg_type) { |
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case TCPDIAG_GETSOCK: |
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case DCCPDIAG_GETSOCK: |
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if (inet_rcv_compat == NULL) |
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sock_load_diag_module(AF_INET, 0); |
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mutex_lock(&sock_diag_table_mutex); |
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if (inet_rcv_compat != NULL) |
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ret = inet_rcv_compat(skb, nlh); |
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else |
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ret = -EOPNOTSUPP; |
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mutex_unlock(&sock_diag_table_mutex); |
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return ret; |
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case SOCK_DIAG_BY_FAMILY: |
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case SOCK_DESTROY: |
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return __sock_diag_cmd(skb, nlh); |
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default: |
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return -EINVAL; |
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} |
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} |
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static DEFINE_MUTEX(sock_diag_mutex); |
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static void sock_diag_rcv(struct sk_buff *skb) |
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{ |
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mutex_lock(&sock_diag_mutex); |
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netlink_rcv_skb(skb, &sock_diag_rcv_msg); |
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mutex_unlock(&sock_diag_mutex); |
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} |
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static int sock_diag_bind(struct net *net, int group) |
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{ |
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switch (group) { |
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case SKNLGRP_INET_TCP_DESTROY: |
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case SKNLGRP_INET_UDP_DESTROY: |
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if (!sock_diag_handlers[AF_INET]) |
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sock_load_diag_module(AF_INET, 0); |
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break; |
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case SKNLGRP_INET6_TCP_DESTROY: |
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case SKNLGRP_INET6_UDP_DESTROY: |
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if (!sock_diag_handlers[AF_INET6]) |
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sock_load_diag_module(AF_INET6, 0); |
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break; |
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} |
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return 0; |
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} |
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int sock_diag_destroy(struct sock *sk, int err) |
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{ |
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if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
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return -EPERM; |
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if (!sk->sk_prot->diag_destroy) |
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return -EOPNOTSUPP; |
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return sk->sk_prot->diag_destroy(sk, err); |
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} |
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EXPORT_SYMBOL_GPL(sock_diag_destroy); |
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static int __net_init diag_net_init(struct net *net) |
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{ |
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struct netlink_kernel_cfg cfg = { |
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.groups = SKNLGRP_MAX, |
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.input = sock_diag_rcv, |
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.bind = sock_diag_bind, |
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.flags = NL_CFG_F_NONROOT_RECV, |
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}; |
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net->diag_nlsk = netlink_kernel_create(net, NETLINK_SOCK_DIAG, &cfg); |
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return net->diag_nlsk == NULL ? -ENOMEM : 0; |
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} |
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static void __net_exit diag_net_exit(struct net *net) |
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{ |
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netlink_kernel_release(net->diag_nlsk); |
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net->diag_nlsk = NULL; |
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} |
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static struct pernet_operations diag_net_ops = { |
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.init = diag_net_init, |
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.exit = diag_net_exit, |
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}; |
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static int __init sock_diag_init(void) |
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{ |
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broadcast_wq = alloc_workqueue("sock_diag_events", 0, 0); |
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BUG_ON(!broadcast_wq); |
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return register_pernet_subsys(&diag_net_ops); |
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} |
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device_initcall(sock_diag_init);
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