![Ying Xue](/assets/img/avatar_default.png)
After TIPC doesn't depend on iocb argument in its internal implementations of sendmsg() and recvmsg() hooks defined in proto structure, no any user is using iocb argument in them at all now. Then we can drop the redundant iocb argument completely from kinds of implementations of both sendmsg() and recvmsg() in the entire networking stack. Cc: Christoph Hellwig <hch@lst.de> Suggested-by: Al Viro <viro@ZenIV.linux.org.uk> Signed-off-by: Ying Xue <ying.xue@windriver.com> Signed-off-by: David S. Miller <davem@davemloft.net>
1102 lines
25 KiB
C
1102 lines
25 KiB
C
/*
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* INET An implementation of the TCP/IP protocol suite for the LINUX
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* operating system. INET is implemented using the BSD Socket
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* interface as the means of communication with the user level.
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*
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* RAW - implementation of IP "raw" sockets.
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*
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* Authors: Ross Biro
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* Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
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*
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* Fixes:
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* Alan Cox : verify_area() fixed up
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* Alan Cox : ICMP error handling
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* Alan Cox : EMSGSIZE if you send too big a packet
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* Alan Cox : Now uses generic datagrams and shared
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* skbuff library. No more peek crashes,
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* no more backlogs
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* Alan Cox : Checks sk->broadcast.
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* Alan Cox : Uses skb_free_datagram/skb_copy_datagram
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* Alan Cox : Raw passes ip options too
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* Alan Cox : Setsocketopt added
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* Alan Cox : Fixed error return for broadcasts
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* Alan Cox : Removed wake_up calls
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* Alan Cox : Use ttl/tos
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* Alan Cox : Cleaned up old debugging
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* Alan Cox : Use new kernel side addresses
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* Arnt Gulbrandsen : Fixed MSG_DONTROUTE in raw sockets.
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* Alan Cox : BSD style RAW socket demultiplexing.
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* Alan Cox : Beginnings of mrouted support.
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* Alan Cox : Added IP_HDRINCL option.
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* Alan Cox : Skip broadcast check if BSDism set.
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* David S. Miller : New socket lookup architecture.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/types.h>
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#include <linux/atomic.h>
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#include <asm/byteorder.h>
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#include <asm/current.h>
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#include <asm/uaccess.h>
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#include <asm/ioctls.h>
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#include <linux/stddef.h>
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#include <linux/slab.h>
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#include <linux/errno.h>
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#include <linux/aio.h>
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#include <linux/kernel.h>
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#include <linux/export.h>
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#include <linux/spinlock.h>
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#include <linux/sockios.h>
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#include <linux/socket.h>
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#include <linux/in.h>
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#include <linux/mroute.h>
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#include <linux/netdevice.h>
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#include <linux/in_route.h>
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#include <linux/route.h>
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#include <linux/skbuff.h>
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#include <linux/igmp.h>
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#include <net/net_namespace.h>
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#include <net/dst.h>
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#include <net/sock.h>
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#include <linux/ip.h>
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#include <linux/net.h>
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#include <net/ip.h>
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#include <net/icmp.h>
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#include <net/udp.h>
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#include <net/raw.h>
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#include <net/snmp.h>
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#include <net/tcp_states.h>
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#include <net/inet_common.h>
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#include <net/checksum.h>
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#include <net/xfrm.h>
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#include <linux/rtnetlink.h>
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#include <linux/proc_fs.h>
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#include <linux/seq_file.h>
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#include <linux/netfilter.h>
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#include <linux/netfilter_ipv4.h>
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#include <linux/compat.h>
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#include <linux/uio.h>
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struct raw_frag_vec {
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struct msghdr *msg;
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union {
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struct icmphdr icmph;
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char c[1];
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} hdr;
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int hlen;
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};
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static struct raw_hashinfo raw_v4_hashinfo = {
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.lock = __RW_LOCK_UNLOCKED(raw_v4_hashinfo.lock),
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};
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void raw_hash_sk(struct sock *sk)
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{
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struct raw_hashinfo *h = sk->sk_prot->h.raw_hash;
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struct hlist_head *head;
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head = &h->ht[inet_sk(sk)->inet_num & (RAW_HTABLE_SIZE - 1)];
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write_lock_bh(&h->lock);
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sk_add_node(sk, head);
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sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
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write_unlock_bh(&h->lock);
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}
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EXPORT_SYMBOL_GPL(raw_hash_sk);
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void raw_unhash_sk(struct sock *sk)
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{
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struct raw_hashinfo *h = sk->sk_prot->h.raw_hash;
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write_lock_bh(&h->lock);
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if (sk_del_node_init(sk))
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sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
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write_unlock_bh(&h->lock);
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}
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EXPORT_SYMBOL_GPL(raw_unhash_sk);
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static struct sock *__raw_v4_lookup(struct net *net, struct sock *sk,
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unsigned short num, __be32 raddr, __be32 laddr, int dif)
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{
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sk_for_each_from(sk) {
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struct inet_sock *inet = inet_sk(sk);
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if (net_eq(sock_net(sk), net) && inet->inet_num == num &&
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!(inet->inet_daddr && inet->inet_daddr != raddr) &&
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!(inet->inet_rcv_saddr && inet->inet_rcv_saddr != laddr) &&
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!(sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif))
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goto found; /* gotcha */
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}
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sk = NULL;
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found:
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return sk;
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}
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/*
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* 0 - deliver
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* 1 - block
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*/
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static int icmp_filter(const struct sock *sk, const struct sk_buff *skb)
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{
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struct icmphdr _hdr;
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const struct icmphdr *hdr;
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hdr = skb_header_pointer(skb, skb_transport_offset(skb),
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sizeof(_hdr), &_hdr);
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if (!hdr)
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return 1;
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if (hdr->type < 32) {
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__u32 data = raw_sk(sk)->filter.data;
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return ((1U << hdr->type) & data) != 0;
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}
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/* Do not block unknown ICMP types */
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return 0;
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}
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/* IP input processing comes here for RAW socket delivery.
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* Caller owns SKB, so we must make clones.
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*
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* RFC 1122: SHOULD pass TOS value up to the transport layer.
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* -> It does. And not only TOS, but all IP header.
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*/
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static int raw_v4_input(struct sk_buff *skb, const struct iphdr *iph, int hash)
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{
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struct sock *sk;
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struct hlist_head *head;
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int delivered = 0;
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struct net *net;
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read_lock(&raw_v4_hashinfo.lock);
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head = &raw_v4_hashinfo.ht[hash];
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if (hlist_empty(head))
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goto out;
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net = dev_net(skb->dev);
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sk = __raw_v4_lookup(net, __sk_head(head), iph->protocol,
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iph->saddr, iph->daddr,
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skb->dev->ifindex);
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while (sk) {
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delivered = 1;
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if ((iph->protocol != IPPROTO_ICMP || !icmp_filter(sk, skb)) &&
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ip_mc_sf_allow(sk, iph->daddr, iph->saddr,
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skb->dev->ifindex)) {
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struct sk_buff *clone = skb_clone(skb, GFP_ATOMIC);
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/* Not releasing hash table! */
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if (clone)
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raw_rcv(sk, clone);
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}
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sk = __raw_v4_lookup(net, sk_next(sk), iph->protocol,
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iph->saddr, iph->daddr,
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skb->dev->ifindex);
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}
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out:
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read_unlock(&raw_v4_hashinfo.lock);
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return delivered;
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}
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int raw_local_deliver(struct sk_buff *skb, int protocol)
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{
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int hash;
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struct sock *raw_sk;
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hash = protocol & (RAW_HTABLE_SIZE - 1);
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raw_sk = sk_head(&raw_v4_hashinfo.ht[hash]);
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/* If there maybe a raw socket we must check - if not we
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* don't care less
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*/
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if (raw_sk && !raw_v4_input(skb, ip_hdr(skb), hash))
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raw_sk = NULL;
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return raw_sk != NULL;
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}
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static void raw_err(struct sock *sk, struct sk_buff *skb, u32 info)
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{
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struct inet_sock *inet = inet_sk(sk);
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const int type = icmp_hdr(skb)->type;
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const int code = icmp_hdr(skb)->code;
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int err = 0;
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int harderr = 0;
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if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED)
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ipv4_sk_update_pmtu(skb, sk, info);
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else if (type == ICMP_REDIRECT) {
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ipv4_sk_redirect(skb, sk);
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return;
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}
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/* Report error on raw socket, if:
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1. User requested ip_recverr.
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2. Socket is connected (otherwise the error indication
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is useless without ip_recverr and error is hard.
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*/
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if (!inet->recverr && sk->sk_state != TCP_ESTABLISHED)
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return;
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switch (type) {
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default:
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case ICMP_TIME_EXCEEDED:
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err = EHOSTUNREACH;
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break;
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case ICMP_SOURCE_QUENCH:
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return;
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case ICMP_PARAMETERPROB:
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err = EPROTO;
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harderr = 1;
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break;
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case ICMP_DEST_UNREACH:
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err = EHOSTUNREACH;
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if (code > NR_ICMP_UNREACH)
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break;
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err = icmp_err_convert[code].errno;
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harderr = icmp_err_convert[code].fatal;
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if (code == ICMP_FRAG_NEEDED) {
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harderr = inet->pmtudisc != IP_PMTUDISC_DONT;
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err = EMSGSIZE;
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}
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}
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if (inet->recverr) {
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const struct iphdr *iph = (const struct iphdr *)skb->data;
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u8 *payload = skb->data + (iph->ihl << 2);
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if (inet->hdrincl)
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payload = skb->data;
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ip_icmp_error(sk, skb, err, 0, info, payload);
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}
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if (inet->recverr || harderr) {
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sk->sk_err = err;
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sk->sk_error_report(sk);
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}
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}
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void raw_icmp_error(struct sk_buff *skb, int protocol, u32 info)
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{
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int hash;
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struct sock *raw_sk;
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const struct iphdr *iph;
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struct net *net;
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hash = protocol & (RAW_HTABLE_SIZE - 1);
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read_lock(&raw_v4_hashinfo.lock);
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raw_sk = sk_head(&raw_v4_hashinfo.ht[hash]);
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if (raw_sk != NULL) {
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iph = (const struct iphdr *)skb->data;
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net = dev_net(skb->dev);
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while ((raw_sk = __raw_v4_lookup(net, raw_sk, protocol,
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iph->daddr, iph->saddr,
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skb->dev->ifindex)) != NULL) {
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raw_err(raw_sk, skb, info);
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raw_sk = sk_next(raw_sk);
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iph = (const struct iphdr *)skb->data;
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}
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}
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read_unlock(&raw_v4_hashinfo.lock);
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}
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static int raw_rcv_skb(struct sock *sk, struct sk_buff *skb)
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{
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/* Charge it to the socket. */
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ipv4_pktinfo_prepare(sk, skb);
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if (sock_queue_rcv_skb(sk, skb) < 0) {
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kfree_skb(skb);
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return NET_RX_DROP;
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}
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return NET_RX_SUCCESS;
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}
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int raw_rcv(struct sock *sk, struct sk_buff *skb)
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{
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if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb)) {
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atomic_inc(&sk->sk_drops);
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kfree_skb(skb);
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return NET_RX_DROP;
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}
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nf_reset(skb);
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skb_push(skb, skb->data - skb_network_header(skb));
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raw_rcv_skb(sk, skb);
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return 0;
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}
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|
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static int raw_send_hdrinc(struct sock *sk, struct flowi4 *fl4,
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struct msghdr *msg, size_t length,
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struct rtable **rtp,
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unsigned int flags)
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{
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struct inet_sock *inet = inet_sk(sk);
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struct net *net = sock_net(sk);
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struct iphdr *iph;
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struct sk_buff *skb;
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unsigned int iphlen;
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int err;
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struct rtable *rt = *rtp;
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int hlen, tlen;
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if (length > rt->dst.dev->mtu) {
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ip_local_error(sk, EMSGSIZE, fl4->daddr, inet->inet_dport,
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rt->dst.dev->mtu);
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return -EMSGSIZE;
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}
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if (flags&MSG_PROBE)
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goto out;
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|
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hlen = LL_RESERVED_SPACE(rt->dst.dev);
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tlen = rt->dst.dev->needed_tailroom;
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skb = sock_alloc_send_skb(sk,
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length + hlen + tlen + 15,
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flags & MSG_DONTWAIT, &err);
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if (skb == NULL)
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goto error;
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skb_reserve(skb, hlen);
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skb->priority = sk->sk_priority;
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skb->mark = sk->sk_mark;
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skb_dst_set(skb, &rt->dst);
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*rtp = NULL;
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|
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skb_reset_network_header(skb);
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iph = ip_hdr(skb);
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skb_put(skb, length);
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|
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skb->ip_summed = CHECKSUM_NONE;
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sock_tx_timestamp(sk, &skb_shinfo(skb)->tx_flags);
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skb->transport_header = skb->network_header;
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err = -EFAULT;
|
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if (memcpy_from_msg(iph, msg, length))
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goto error_free;
|
|
|
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iphlen = iph->ihl * 4;
|
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|
|
/*
|
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* We don't want to modify the ip header, but we do need to
|
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* be sure that it won't cause problems later along the network
|
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* stack. Specifically we want to make sure that iph->ihl is a
|
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* sane value. If ihl points beyond the length of the buffer passed
|
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* in, reject the frame as invalid
|
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*/
|
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err = -EINVAL;
|
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if (iphlen > length)
|
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goto error_free;
|
|
|
|
if (iphlen >= sizeof(*iph)) {
|
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if (!iph->saddr)
|
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iph->saddr = fl4->saddr;
|
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iph->check = 0;
|
|
iph->tot_len = htons(length);
|
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if (!iph->id)
|
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ip_select_ident(skb, NULL);
|
|
|
|
iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl);
|
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}
|
|
if (iph->protocol == IPPROTO_ICMP)
|
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icmp_out_count(net, ((struct icmphdr *)
|
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skb_transport_header(skb))->type);
|
|
|
|
err = NF_HOOK(NFPROTO_IPV4, NF_INET_LOCAL_OUT, skb, NULL,
|
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rt->dst.dev, dst_output);
|
|
if (err > 0)
|
|
err = net_xmit_errno(err);
|
|
if (err)
|
|
goto error;
|
|
out:
|
|
return 0;
|
|
|
|
error_free:
|
|
kfree_skb(skb);
|
|
error:
|
|
IP_INC_STATS(net, IPSTATS_MIB_OUTDISCARDS);
|
|
if (err == -ENOBUFS && !inet->recverr)
|
|
err = 0;
|
|
return err;
|
|
}
|
|
|
|
static int raw_probe_proto_opt(struct raw_frag_vec *rfv, struct flowi4 *fl4)
|
|
{
|
|
int err;
|
|
|
|
if (fl4->flowi4_proto != IPPROTO_ICMP)
|
|
return 0;
|
|
|
|
/* We only need the first two bytes. */
|
|
rfv->hlen = 2;
|
|
|
|
err = memcpy_from_msg(rfv->hdr.c, rfv->msg, rfv->hlen);
|
|
if (err)
|
|
return err;
|
|
|
|
fl4->fl4_icmp_type = rfv->hdr.icmph.type;
|
|
fl4->fl4_icmp_code = rfv->hdr.icmph.code;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int raw_getfrag(void *from, char *to, int offset, int len, int odd,
|
|
struct sk_buff *skb)
|
|
{
|
|
struct raw_frag_vec *rfv = from;
|
|
|
|
if (offset < rfv->hlen) {
|
|
int copy = min(rfv->hlen - offset, len);
|
|
|
|
if (skb->ip_summed == CHECKSUM_PARTIAL)
|
|
memcpy(to, rfv->hdr.c + offset, copy);
|
|
else
|
|
skb->csum = csum_block_add(
|
|
skb->csum,
|
|
csum_partial_copy_nocheck(rfv->hdr.c + offset,
|
|
to, copy, 0),
|
|
odd);
|
|
|
|
odd = 0;
|
|
offset += copy;
|
|
to += copy;
|
|
len -= copy;
|
|
|
|
if (!len)
|
|
return 0;
|
|
}
|
|
|
|
offset -= rfv->hlen;
|
|
|
|
return ip_generic_getfrag(rfv->msg, to, offset, len, odd, skb);
|
|
}
|
|
|
|
static int raw_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
|
|
{
|
|
struct inet_sock *inet = inet_sk(sk);
|
|
struct ipcm_cookie ipc;
|
|
struct rtable *rt = NULL;
|
|
struct flowi4 fl4;
|
|
int free = 0;
|
|
__be32 daddr;
|
|
__be32 saddr;
|
|
u8 tos;
|
|
int err;
|
|
struct ip_options_data opt_copy;
|
|
struct raw_frag_vec rfv;
|
|
|
|
err = -EMSGSIZE;
|
|
if (len > 0xFFFF)
|
|
goto out;
|
|
|
|
/*
|
|
* Check the flags.
|
|
*/
|
|
|
|
err = -EOPNOTSUPP;
|
|
if (msg->msg_flags & MSG_OOB) /* Mirror BSD error message */
|
|
goto out; /* compatibility */
|
|
|
|
/*
|
|
* Get and verify the address.
|
|
*/
|
|
|
|
if (msg->msg_namelen) {
|
|
DECLARE_SOCKADDR(struct sockaddr_in *, usin, msg->msg_name);
|
|
err = -EINVAL;
|
|
if (msg->msg_namelen < sizeof(*usin))
|
|
goto out;
|
|
if (usin->sin_family != AF_INET) {
|
|
pr_info_once("%s: %s forgot to set AF_INET. Fix it!\n",
|
|
__func__, current->comm);
|
|
err = -EAFNOSUPPORT;
|
|
if (usin->sin_family)
|
|
goto out;
|
|
}
|
|
daddr = usin->sin_addr.s_addr;
|
|
/* ANK: I did not forget to get protocol from port field.
|
|
* I just do not know, who uses this weirdness.
|
|
* IP_HDRINCL is much more convenient.
|
|
*/
|
|
} else {
|
|
err = -EDESTADDRREQ;
|
|
if (sk->sk_state != TCP_ESTABLISHED)
|
|
goto out;
|
|
daddr = inet->inet_daddr;
|
|
}
|
|
|
|
ipc.addr = inet->inet_saddr;
|
|
ipc.opt = NULL;
|
|
ipc.tx_flags = 0;
|
|
ipc.ttl = 0;
|
|
ipc.tos = -1;
|
|
ipc.oif = sk->sk_bound_dev_if;
|
|
|
|
if (msg->msg_controllen) {
|
|
err = ip_cmsg_send(sock_net(sk), msg, &ipc, false);
|
|
if (err)
|
|
goto out;
|
|
if (ipc.opt)
|
|
free = 1;
|
|
}
|
|
|
|
saddr = ipc.addr;
|
|
ipc.addr = daddr;
|
|
|
|
if (!ipc.opt) {
|
|
struct ip_options_rcu *inet_opt;
|
|
|
|
rcu_read_lock();
|
|
inet_opt = rcu_dereference(inet->inet_opt);
|
|
if (inet_opt) {
|
|
memcpy(&opt_copy, inet_opt,
|
|
sizeof(*inet_opt) + inet_opt->opt.optlen);
|
|
ipc.opt = &opt_copy.opt;
|
|
}
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
if (ipc.opt) {
|
|
err = -EINVAL;
|
|
/* Linux does not mangle headers on raw sockets,
|
|
* so that IP options + IP_HDRINCL is non-sense.
|
|
*/
|
|
if (inet->hdrincl)
|
|
goto done;
|
|
if (ipc.opt->opt.srr) {
|
|
if (!daddr)
|
|
goto done;
|
|
daddr = ipc.opt->opt.faddr;
|
|
}
|
|
}
|
|
tos = get_rtconn_flags(&ipc, sk);
|
|
if (msg->msg_flags & MSG_DONTROUTE)
|
|
tos |= RTO_ONLINK;
|
|
|
|
if (ipv4_is_multicast(daddr)) {
|
|
if (!ipc.oif)
|
|
ipc.oif = inet->mc_index;
|
|
if (!saddr)
|
|
saddr = inet->mc_addr;
|
|
} else if (!ipc.oif)
|
|
ipc.oif = inet->uc_index;
|
|
|
|
flowi4_init_output(&fl4, ipc.oif, sk->sk_mark, tos,
|
|
RT_SCOPE_UNIVERSE,
|
|
inet->hdrincl ? IPPROTO_RAW : sk->sk_protocol,
|
|
inet_sk_flowi_flags(sk) |
|
|
(inet->hdrincl ? FLOWI_FLAG_KNOWN_NH : 0),
|
|
daddr, saddr, 0, 0);
|
|
|
|
if (!inet->hdrincl) {
|
|
rfv.msg = msg;
|
|
rfv.hlen = 0;
|
|
|
|
err = raw_probe_proto_opt(&rfv, &fl4);
|
|
if (err)
|
|
goto done;
|
|
}
|
|
|
|
security_sk_classify_flow(sk, flowi4_to_flowi(&fl4));
|
|
rt = ip_route_output_flow(sock_net(sk), &fl4, sk);
|
|
if (IS_ERR(rt)) {
|
|
err = PTR_ERR(rt);
|
|
rt = NULL;
|
|
goto done;
|
|
}
|
|
|
|
err = -EACCES;
|
|
if (rt->rt_flags & RTCF_BROADCAST && !sock_flag(sk, SOCK_BROADCAST))
|
|
goto done;
|
|
|
|
if (msg->msg_flags & MSG_CONFIRM)
|
|
goto do_confirm;
|
|
back_from_confirm:
|
|
|
|
if (inet->hdrincl)
|
|
err = raw_send_hdrinc(sk, &fl4, msg, len,
|
|
&rt, msg->msg_flags);
|
|
|
|
else {
|
|
sock_tx_timestamp(sk, &ipc.tx_flags);
|
|
|
|
if (!ipc.addr)
|
|
ipc.addr = fl4.daddr;
|
|
lock_sock(sk);
|
|
err = ip_append_data(sk, &fl4, raw_getfrag,
|
|
&rfv, len, 0,
|
|
&ipc, &rt, msg->msg_flags);
|
|
if (err)
|
|
ip_flush_pending_frames(sk);
|
|
else if (!(msg->msg_flags & MSG_MORE)) {
|
|
err = ip_push_pending_frames(sk, &fl4);
|
|
if (err == -ENOBUFS && !inet->recverr)
|
|
err = 0;
|
|
}
|
|
release_sock(sk);
|
|
}
|
|
done:
|
|
if (free)
|
|
kfree(ipc.opt);
|
|
ip_rt_put(rt);
|
|
|
|
out:
|
|
if (err < 0)
|
|
return err;
|
|
return len;
|
|
|
|
do_confirm:
|
|
dst_confirm(&rt->dst);
|
|
if (!(msg->msg_flags & MSG_PROBE) || len)
|
|
goto back_from_confirm;
|
|
err = 0;
|
|
goto done;
|
|
}
|
|
|
|
static void raw_close(struct sock *sk, long timeout)
|
|
{
|
|
/*
|
|
* Raw sockets may have direct kernel references. Kill them.
|
|
*/
|
|
ip_ra_control(sk, 0, NULL);
|
|
|
|
sk_common_release(sk);
|
|
}
|
|
|
|
static void raw_destroy(struct sock *sk)
|
|
{
|
|
lock_sock(sk);
|
|
ip_flush_pending_frames(sk);
|
|
release_sock(sk);
|
|
}
|
|
|
|
/* This gets rid of all the nasties in af_inet. -DaveM */
|
|
static int raw_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
|
|
{
|
|
struct inet_sock *inet = inet_sk(sk);
|
|
struct sockaddr_in *addr = (struct sockaddr_in *) uaddr;
|
|
int ret = -EINVAL;
|
|
int chk_addr_ret;
|
|
|
|
if (sk->sk_state != TCP_CLOSE || addr_len < sizeof(struct sockaddr_in))
|
|
goto out;
|
|
chk_addr_ret = inet_addr_type(sock_net(sk), addr->sin_addr.s_addr);
|
|
ret = -EADDRNOTAVAIL;
|
|
if (addr->sin_addr.s_addr && chk_addr_ret != RTN_LOCAL &&
|
|
chk_addr_ret != RTN_MULTICAST && chk_addr_ret != RTN_BROADCAST)
|
|
goto out;
|
|
inet->inet_rcv_saddr = inet->inet_saddr = addr->sin_addr.s_addr;
|
|
if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST)
|
|
inet->inet_saddr = 0; /* Use device */
|
|
sk_dst_reset(sk);
|
|
ret = 0;
|
|
out: return ret;
|
|
}
|
|
|
|
/*
|
|
* This should be easy, if there is something there
|
|
* we return it, otherwise we block.
|
|
*/
|
|
|
|
static int raw_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
|
|
int noblock, int flags, int *addr_len)
|
|
{
|
|
struct inet_sock *inet = inet_sk(sk);
|
|
size_t copied = 0;
|
|
int err = -EOPNOTSUPP;
|
|
DECLARE_SOCKADDR(struct sockaddr_in *, sin, msg->msg_name);
|
|
struct sk_buff *skb;
|
|
|
|
if (flags & MSG_OOB)
|
|
goto out;
|
|
|
|
if (flags & MSG_ERRQUEUE) {
|
|
err = ip_recv_error(sk, msg, len, addr_len);
|
|
goto out;
|
|
}
|
|
|
|
skb = skb_recv_datagram(sk, flags, noblock, &err);
|
|
if (!skb)
|
|
goto out;
|
|
|
|
copied = skb->len;
|
|
if (len < copied) {
|
|
msg->msg_flags |= MSG_TRUNC;
|
|
copied = len;
|
|
}
|
|
|
|
err = skb_copy_datagram_msg(skb, 0, msg, copied);
|
|
if (err)
|
|
goto done;
|
|
|
|
sock_recv_ts_and_drops(msg, sk, skb);
|
|
|
|
/* Copy the address. */
|
|
if (sin) {
|
|
sin->sin_family = AF_INET;
|
|
sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
|
|
sin->sin_port = 0;
|
|
memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
|
|
*addr_len = sizeof(*sin);
|
|
}
|
|
if (inet->cmsg_flags)
|
|
ip_cmsg_recv(msg, skb);
|
|
if (flags & MSG_TRUNC)
|
|
copied = skb->len;
|
|
done:
|
|
skb_free_datagram(sk, skb);
|
|
out:
|
|
if (err)
|
|
return err;
|
|
return copied;
|
|
}
|
|
|
|
static int raw_init(struct sock *sk)
|
|
{
|
|
struct raw_sock *rp = raw_sk(sk);
|
|
|
|
if (inet_sk(sk)->inet_num == IPPROTO_ICMP)
|
|
memset(&rp->filter, 0, sizeof(rp->filter));
|
|
return 0;
|
|
}
|
|
|
|
static int raw_seticmpfilter(struct sock *sk, char __user *optval, int optlen)
|
|
{
|
|
if (optlen > sizeof(struct icmp_filter))
|
|
optlen = sizeof(struct icmp_filter);
|
|
if (copy_from_user(&raw_sk(sk)->filter, optval, optlen))
|
|
return -EFAULT;
|
|
return 0;
|
|
}
|
|
|
|
static int raw_geticmpfilter(struct sock *sk, char __user *optval, int __user *optlen)
|
|
{
|
|
int len, ret = -EFAULT;
|
|
|
|
if (get_user(len, optlen))
|
|
goto out;
|
|
ret = -EINVAL;
|
|
if (len < 0)
|
|
goto out;
|
|
if (len > sizeof(struct icmp_filter))
|
|
len = sizeof(struct icmp_filter);
|
|
ret = -EFAULT;
|
|
if (put_user(len, optlen) ||
|
|
copy_to_user(optval, &raw_sk(sk)->filter, len))
|
|
goto out;
|
|
ret = 0;
|
|
out: return ret;
|
|
}
|
|
|
|
static int do_raw_setsockopt(struct sock *sk, int level, int optname,
|
|
char __user *optval, unsigned int optlen)
|
|
{
|
|
if (optname == ICMP_FILTER) {
|
|
if (inet_sk(sk)->inet_num != IPPROTO_ICMP)
|
|
return -EOPNOTSUPP;
|
|
else
|
|
return raw_seticmpfilter(sk, optval, optlen);
|
|
}
|
|
return -ENOPROTOOPT;
|
|
}
|
|
|
|
static int raw_setsockopt(struct sock *sk, int level, int optname,
|
|
char __user *optval, unsigned int optlen)
|
|
{
|
|
if (level != SOL_RAW)
|
|
return ip_setsockopt(sk, level, optname, optval, optlen);
|
|
return do_raw_setsockopt(sk, level, optname, optval, optlen);
|
|
}
|
|
|
|
#ifdef CONFIG_COMPAT
|
|
static int compat_raw_setsockopt(struct sock *sk, int level, int optname,
|
|
char __user *optval, unsigned int optlen)
|
|
{
|
|
if (level != SOL_RAW)
|
|
return compat_ip_setsockopt(sk, level, optname, optval, optlen);
|
|
return do_raw_setsockopt(sk, level, optname, optval, optlen);
|
|
}
|
|
#endif
|
|
|
|
static int do_raw_getsockopt(struct sock *sk, int level, int optname,
|
|
char __user *optval, int __user *optlen)
|
|
{
|
|
if (optname == ICMP_FILTER) {
|
|
if (inet_sk(sk)->inet_num != IPPROTO_ICMP)
|
|
return -EOPNOTSUPP;
|
|
else
|
|
return raw_geticmpfilter(sk, optval, optlen);
|
|
}
|
|
return -ENOPROTOOPT;
|
|
}
|
|
|
|
static int raw_getsockopt(struct sock *sk, int level, int optname,
|
|
char __user *optval, int __user *optlen)
|
|
{
|
|
if (level != SOL_RAW)
|
|
return ip_getsockopt(sk, level, optname, optval, optlen);
|
|
return do_raw_getsockopt(sk, level, optname, optval, optlen);
|
|
}
|
|
|
|
#ifdef CONFIG_COMPAT
|
|
static int compat_raw_getsockopt(struct sock *sk, int level, int optname,
|
|
char __user *optval, int __user *optlen)
|
|
{
|
|
if (level != SOL_RAW)
|
|
return compat_ip_getsockopt(sk, level, optname, optval, optlen);
|
|
return do_raw_getsockopt(sk, level, optname, optval, optlen);
|
|
}
|
|
#endif
|
|
|
|
static int raw_ioctl(struct sock *sk, int cmd, unsigned long arg)
|
|
{
|
|
switch (cmd) {
|
|
case SIOCOUTQ: {
|
|
int amount = sk_wmem_alloc_get(sk);
|
|
|
|
return put_user(amount, (int __user *)arg);
|
|
}
|
|
case SIOCINQ: {
|
|
struct sk_buff *skb;
|
|
int amount = 0;
|
|
|
|
spin_lock_bh(&sk->sk_receive_queue.lock);
|
|
skb = skb_peek(&sk->sk_receive_queue);
|
|
if (skb != NULL)
|
|
amount = skb->len;
|
|
spin_unlock_bh(&sk->sk_receive_queue.lock);
|
|
return put_user(amount, (int __user *)arg);
|
|
}
|
|
|
|
default:
|
|
#ifdef CONFIG_IP_MROUTE
|
|
return ipmr_ioctl(sk, cmd, (void __user *)arg);
|
|
#else
|
|
return -ENOIOCTLCMD;
|
|
#endif
|
|
}
|
|
}
|
|
|
|
#ifdef CONFIG_COMPAT
|
|
static int compat_raw_ioctl(struct sock *sk, unsigned int cmd, unsigned long arg)
|
|
{
|
|
switch (cmd) {
|
|
case SIOCOUTQ:
|
|
case SIOCINQ:
|
|
return -ENOIOCTLCMD;
|
|
default:
|
|
#ifdef CONFIG_IP_MROUTE
|
|
return ipmr_compat_ioctl(sk, cmd, compat_ptr(arg));
|
|
#else
|
|
return -ENOIOCTLCMD;
|
|
#endif
|
|
}
|
|
}
|
|
#endif
|
|
|
|
struct proto raw_prot = {
|
|
.name = "RAW",
|
|
.owner = THIS_MODULE,
|
|
.close = raw_close,
|
|
.destroy = raw_destroy,
|
|
.connect = ip4_datagram_connect,
|
|
.disconnect = udp_disconnect,
|
|
.ioctl = raw_ioctl,
|
|
.init = raw_init,
|
|
.setsockopt = raw_setsockopt,
|
|
.getsockopt = raw_getsockopt,
|
|
.sendmsg = raw_sendmsg,
|
|
.recvmsg = raw_recvmsg,
|
|
.bind = raw_bind,
|
|
.backlog_rcv = raw_rcv_skb,
|
|
.release_cb = ip4_datagram_release_cb,
|
|
.hash = raw_hash_sk,
|
|
.unhash = raw_unhash_sk,
|
|
.obj_size = sizeof(struct raw_sock),
|
|
.h.raw_hash = &raw_v4_hashinfo,
|
|
#ifdef CONFIG_COMPAT
|
|
.compat_setsockopt = compat_raw_setsockopt,
|
|
.compat_getsockopt = compat_raw_getsockopt,
|
|
.compat_ioctl = compat_raw_ioctl,
|
|
#endif
|
|
};
|
|
|
|
#ifdef CONFIG_PROC_FS
|
|
static struct sock *raw_get_first(struct seq_file *seq)
|
|
{
|
|
struct sock *sk;
|
|
struct raw_iter_state *state = raw_seq_private(seq);
|
|
|
|
for (state->bucket = 0; state->bucket < RAW_HTABLE_SIZE;
|
|
++state->bucket) {
|
|
sk_for_each(sk, &state->h->ht[state->bucket])
|
|
if (sock_net(sk) == seq_file_net(seq))
|
|
goto found;
|
|
}
|
|
sk = NULL;
|
|
found:
|
|
return sk;
|
|
}
|
|
|
|
static struct sock *raw_get_next(struct seq_file *seq, struct sock *sk)
|
|
{
|
|
struct raw_iter_state *state = raw_seq_private(seq);
|
|
|
|
do {
|
|
sk = sk_next(sk);
|
|
try_again:
|
|
;
|
|
} while (sk && sock_net(sk) != seq_file_net(seq));
|
|
|
|
if (!sk && ++state->bucket < RAW_HTABLE_SIZE) {
|
|
sk = sk_head(&state->h->ht[state->bucket]);
|
|
goto try_again;
|
|
}
|
|
return sk;
|
|
}
|
|
|
|
static struct sock *raw_get_idx(struct seq_file *seq, loff_t pos)
|
|
{
|
|
struct sock *sk = raw_get_first(seq);
|
|
|
|
if (sk)
|
|
while (pos && (sk = raw_get_next(seq, sk)) != NULL)
|
|
--pos;
|
|
return pos ? NULL : sk;
|
|
}
|
|
|
|
void *raw_seq_start(struct seq_file *seq, loff_t *pos)
|
|
{
|
|
struct raw_iter_state *state = raw_seq_private(seq);
|
|
|
|
read_lock(&state->h->lock);
|
|
return *pos ? raw_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
|
|
}
|
|
EXPORT_SYMBOL_GPL(raw_seq_start);
|
|
|
|
void *raw_seq_next(struct seq_file *seq, void *v, loff_t *pos)
|
|
{
|
|
struct sock *sk;
|
|
|
|
if (v == SEQ_START_TOKEN)
|
|
sk = raw_get_first(seq);
|
|
else
|
|
sk = raw_get_next(seq, v);
|
|
++*pos;
|
|
return sk;
|
|
}
|
|
EXPORT_SYMBOL_GPL(raw_seq_next);
|
|
|
|
void raw_seq_stop(struct seq_file *seq, void *v)
|
|
{
|
|
struct raw_iter_state *state = raw_seq_private(seq);
|
|
|
|
read_unlock(&state->h->lock);
|
|
}
|
|
EXPORT_SYMBOL_GPL(raw_seq_stop);
|
|
|
|
static void raw_sock_seq_show(struct seq_file *seq, struct sock *sp, int i)
|
|
{
|
|
struct inet_sock *inet = inet_sk(sp);
|
|
__be32 dest = inet->inet_daddr,
|
|
src = inet->inet_rcv_saddr;
|
|
__u16 destp = 0,
|
|
srcp = inet->inet_num;
|
|
|
|
seq_printf(seq, "%4d: %08X:%04X %08X:%04X"
|
|
" %02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %d\n",
|
|
i, src, srcp, dest, destp, sp->sk_state,
|
|
sk_wmem_alloc_get(sp),
|
|
sk_rmem_alloc_get(sp),
|
|
0, 0L, 0,
|
|
from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)),
|
|
0, sock_i_ino(sp),
|
|
atomic_read(&sp->sk_refcnt), sp, atomic_read(&sp->sk_drops));
|
|
}
|
|
|
|
static int raw_seq_show(struct seq_file *seq, void *v)
|
|
{
|
|
if (v == SEQ_START_TOKEN)
|
|
seq_printf(seq, " sl local_address rem_address st tx_queue "
|
|
"rx_queue tr tm->when retrnsmt uid timeout "
|
|
"inode ref pointer drops\n");
|
|
else
|
|
raw_sock_seq_show(seq, v, raw_seq_private(seq)->bucket);
|
|
return 0;
|
|
}
|
|
|
|
static const struct seq_operations raw_seq_ops = {
|
|
.start = raw_seq_start,
|
|
.next = raw_seq_next,
|
|
.stop = raw_seq_stop,
|
|
.show = raw_seq_show,
|
|
};
|
|
|
|
int raw_seq_open(struct inode *ino, struct file *file,
|
|
struct raw_hashinfo *h, const struct seq_operations *ops)
|
|
{
|
|
int err;
|
|
struct raw_iter_state *i;
|
|
|
|
err = seq_open_net(ino, file, ops, sizeof(struct raw_iter_state));
|
|
if (err < 0)
|
|
return err;
|
|
|
|
i = raw_seq_private((struct seq_file *)file->private_data);
|
|
i->h = h;
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(raw_seq_open);
|
|
|
|
static int raw_v4_seq_open(struct inode *inode, struct file *file)
|
|
{
|
|
return raw_seq_open(inode, file, &raw_v4_hashinfo, &raw_seq_ops);
|
|
}
|
|
|
|
static const struct file_operations raw_seq_fops = {
|
|
.owner = THIS_MODULE,
|
|
.open = raw_v4_seq_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = seq_release_net,
|
|
};
|
|
|
|
static __net_init int raw_init_net(struct net *net)
|
|
{
|
|
if (!proc_create("raw", S_IRUGO, net->proc_net, &raw_seq_fops))
|
|
return -ENOMEM;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static __net_exit void raw_exit_net(struct net *net)
|
|
{
|
|
remove_proc_entry("raw", net->proc_net);
|
|
}
|
|
|
|
static __net_initdata struct pernet_operations raw_net_ops = {
|
|
.init = raw_init_net,
|
|
.exit = raw_exit_net,
|
|
};
|
|
|
|
int __init raw_proc_init(void)
|
|
{
|
|
return register_pernet_subsys(&raw_net_ops);
|
|
}
|
|
|
|
void __init raw_proc_exit(void)
|
|
{
|
|
unregister_pernet_subsys(&raw_net_ops);
|
|
}
|
|
#endif /* CONFIG_PROC_FS */
|