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1136 lines
26 KiB
1136 lines
26 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
|
/* |
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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, <[email protected]> |
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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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|
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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 <linux/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/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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|
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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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|
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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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EXPORT_SYMBOL_GPL(raw_v4_hashinfo); |
|
|
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int 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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|
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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); |
|
|
|
return 0; |
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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; |
|
|
|
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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|
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struct sock *__raw_v4_lookup(struct net *net, struct sock *sk, |
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unsigned short num, __be32 raddr, __be32 laddr, |
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int dif, int sdif) |
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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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|
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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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raw_sk_bound_dev_eq(net, sk->sk_bound_dev_if, dif, sdif)) |
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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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EXPORT_SYMBOL_GPL(__raw_v4_lookup); |
|
|
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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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|
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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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|
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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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int sdif = inet_sdif(skb); |
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int dif = inet_iif(skb); |
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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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|
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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, dif, sdif); |
|
|
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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, sdif)) { |
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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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dif, sdif); |
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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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static void raw_err(struct sock *sk, struct sk_buff *skb, u32 info) |
|
{ |
|
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; |
|
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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/* 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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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: |
|
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; |
|
break; |
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case ICMP_DEST_UNREACH: |
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err = EHOSTUNREACH; |
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if (code > NR_ICMP_UNREACH) |
|
break; |
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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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} else { |
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err = icmp_err_convert[code].errno; |
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harderr = icmp_err_convert[code].fatal; |
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} |
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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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|
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if (inet->recverr || harderr) { |
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sk->sk_err = err; |
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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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|
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hash = protocol & (RAW_HTABLE_SIZE - 1); |
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|
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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) { |
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int dif = skb->dev->ifindex; |
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int sdif = inet_sdif(skb); |
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|
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iph = (const struct iphdr *)skb->data; |
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net = dev_net(skb->dev); |
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|
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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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dif, sdif)) != 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); |
|
kfree_skb(skb); |
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return NET_RX_DROP; |
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} |
|
nf_reset_ct(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; |
|
} |
|
|
|
static int raw_send_hdrinc(struct sock *sk, struct flowi4 *fl4, |
|
struct msghdr *msg, size_t length, |
|
struct rtable **rtp, unsigned int flags, |
|
const struct sockcm_cookie *sockc) |
|
{ |
|
struct inet_sock *inet = inet_sk(sk); |
|
struct net *net = sock_net(sk); |
|
struct iphdr *iph; |
|
struct sk_buff *skb; |
|
unsigned int iphlen; |
|
int err; |
|
struct rtable *rt = *rtp; |
|
int hlen, tlen; |
|
|
|
if (length > rt->dst.dev->mtu) { |
|
ip_local_error(sk, EMSGSIZE, fl4->daddr, inet->inet_dport, |
|
rt->dst.dev->mtu); |
|
return -EMSGSIZE; |
|
} |
|
if (length < sizeof(struct iphdr)) |
|
return -EINVAL; |
|
|
|
if (flags&MSG_PROBE) |
|
goto out; |
|
|
|
hlen = LL_RESERVED_SPACE(rt->dst.dev); |
|
tlen = rt->dst.dev->needed_tailroom; |
|
skb = sock_alloc_send_skb(sk, |
|
length + hlen + tlen + 15, |
|
flags & MSG_DONTWAIT, &err); |
|
if (!skb) |
|
goto error; |
|
skb_reserve(skb, hlen); |
|
|
|
skb->priority = sk->sk_priority; |
|
skb->mark = sockc->mark; |
|
skb->tstamp = sockc->transmit_time; |
|
skb_dst_set(skb, &rt->dst); |
|
*rtp = NULL; |
|
|
|
skb_reset_network_header(skb); |
|
iph = ip_hdr(skb); |
|
skb_put(skb, length); |
|
|
|
skb->ip_summed = CHECKSUM_NONE; |
|
|
|
skb_setup_tx_timestamp(skb, sockc->tsflags); |
|
|
|
if (flags & MSG_CONFIRM) |
|
skb_set_dst_pending_confirm(skb, 1); |
|
|
|
skb->transport_header = skb->network_header; |
|
err = -EFAULT; |
|
if (memcpy_from_msg(iph, msg, length)) |
|
goto error_free; |
|
|
|
iphlen = iph->ihl * 4; |
|
|
|
/* |
|
* We don't want to modify the ip header, but we do need to |
|
* be sure that it won't cause problems later along the network |
|
* stack. Specifically we want to make sure that iph->ihl is a |
|
* sane value. If ihl points beyond the length of the buffer passed |
|
* in, reject the frame as invalid |
|
*/ |
|
err = -EINVAL; |
|
if (iphlen > length) |
|
goto error_free; |
|
|
|
if (iphlen >= sizeof(*iph)) { |
|
if (!iph->saddr) |
|
iph->saddr = fl4->saddr; |
|
iph->check = 0; |
|
iph->tot_len = htons(length); |
|
if (!iph->id) |
|
ip_select_ident(net, skb, NULL); |
|
|
|
iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl); |
|
skb->transport_header += iphlen; |
|
if (iph->protocol == IPPROTO_ICMP && |
|
length >= iphlen + sizeof(struct icmphdr)) |
|
icmp_out_count(net, ((struct icmphdr *) |
|
skb_transport_header(skb))->type); |
|
} |
|
|
|
err = NF_HOOK(NFPROTO_IPV4, NF_INET_LOCAL_OUT, |
|
net, sk, skb, NULL, 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), |
|
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 net *net = sock_net(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; |
|
int hdrincl; |
|
|
|
err = -EMSGSIZE; |
|
if (len > 0xFFFF) |
|
goto out; |
|
|
|
/* hdrincl should be READ_ONCE(inet->hdrincl) |
|
* but READ_ONCE() doesn't work with bit fields. |
|
* Doing this indirectly yields the same result. |
|
*/ |
|
hdrincl = inet->hdrincl; |
|
hdrincl = READ_ONCE(hdrincl); |
|
/* |
|
* 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; |
|
} |
|
|
|
ipcm_init_sk(&ipc, inet); |
|
|
|
if (msg->msg_controllen) { |
|
err = ip_cmsg_send(sk, msg, &ipc, false); |
|
if (unlikely(err)) { |
|
kfree(ipc.opt); |
|
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 (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 || netif_index_is_l3_master(sock_net(sk), ipc.oif)) |
|
ipc.oif = inet->mc_index; |
|
if (!saddr) |
|
saddr = inet->mc_addr; |
|
} else if (!ipc.oif) { |
|
ipc.oif = inet->uc_index; |
|
} else if (ipv4_is_lbcast(daddr) && inet->uc_index) { |
|
/* oif is set, packet is to local broadcast |
|
* and uc_index is set. oif is most likely set |
|
* by sk_bound_dev_if. If uc_index != oif check if the |
|
* oif is an L3 master and uc_index is an L3 slave. |
|
* If so, we want to allow the send using the uc_index. |
|
*/ |
|
if (ipc.oif != inet->uc_index && |
|
ipc.oif == l3mdev_master_ifindex_by_index(sock_net(sk), |
|
inet->uc_index)) { |
|
ipc.oif = inet->uc_index; |
|
} |
|
} |
|
|
|
flowi4_init_output(&fl4, ipc.oif, ipc.sockc.mark, tos, |
|
RT_SCOPE_UNIVERSE, |
|
hdrincl ? IPPROTO_RAW : sk->sk_protocol, |
|
inet_sk_flowi_flags(sk) | |
|
(hdrincl ? FLOWI_FLAG_KNOWN_NH : 0), |
|
daddr, saddr, 0, 0, sk->sk_uid); |
|
|
|
if (!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_common(&fl4)); |
|
rt = ip_route_output_flow(net, &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 (hdrincl) |
|
err = raw_send_hdrinc(sk, &fl4, msg, len, |
|
&rt, msg->msg_flags, &ipc.sockc); |
|
|
|
else { |
|
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: |
|
if (msg->msg_flags & MSG_PROBE) |
|
dst_confirm_neigh(&rt->dst, &fl4.daddr); |
|
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; |
|
u32 tb_id = RT_TABLE_LOCAL; |
|
int ret = -EINVAL; |
|
int chk_addr_ret; |
|
|
|
if (sk->sk_state != TCP_CLOSE || addr_len < sizeof(struct sockaddr_in)) |
|
goto out; |
|
|
|
if (sk->sk_bound_dev_if) |
|
tb_id = l3mdev_fib_table_by_index(sock_net(sk), |
|
sk->sk_bound_dev_if) ? : tb_id; |
|
|
|
chk_addr_ret = inet_addr_type_table(sock_net(sk), addr->sin_addr.s_addr, |
|
tb_id); |
|
|
|
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_sk_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, sockptr_t optval, int optlen) |
|
{ |
|
if (optlen > sizeof(struct icmp_filter)) |
|
optlen = sizeof(struct icmp_filter); |
|
if (copy_from_sockptr(&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, |
|
sockptr_t 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, |
|
sockptr_t 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); |
|
} |
|
|
|
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); |
|
} |
|
|
|
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) |
|
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 |
|
|
|
int raw_abort(struct sock *sk, int err) |
|
{ |
|
lock_sock(sk); |
|
|
|
sk->sk_err = err; |
|
sk_error_report(sk); |
|
__udp_disconnect(sk, 0); |
|
|
|
release_sock(sk); |
|
|
|
return 0; |
|
} |
|
EXPORT_SYMBOL_GPL(raw_abort); |
|
|
|
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_sk_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), |
|
.useroffset = offsetof(struct raw_sock, filter), |
|
.usersize = sizeof_field(struct raw_sock, filter), |
|
.h.raw_hash = &raw_v4_hashinfo, |
|
#ifdef CONFIG_COMPAT |
|
.compat_ioctl = compat_raw_ioctl, |
|
#endif |
|
.diag_destroy = raw_abort, |
|
}; |
|
|
|
#ifdef CONFIG_PROC_FS |
|
static struct sock *raw_get_first(struct seq_file *seq) |
|
{ |
|
struct sock *sk; |
|
struct raw_hashinfo *h = PDE_DATA(file_inode(seq->file)); |
|
struct raw_iter_state *state = raw_seq_private(seq); |
|
|
|
for (state->bucket = 0; state->bucket < RAW_HTABLE_SIZE; |
|
++state->bucket) { |
|
sk_for_each(sk, &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_hashinfo *h = PDE_DATA(file_inode(seq->file)); |
|
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(&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) |
|
__acquires(&h->lock) |
|
{ |
|
struct raw_hashinfo *h = PDE_DATA(file_inode(seq->file)); |
|
|
|
read_lock(&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) |
|
__releases(&h->lock) |
|
{ |
|
struct raw_hashinfo *h = PDE_DATA(file_inode(seq->file)); |
|
|
|
read_unlock(&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 %u\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), |
|
refcount_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, |
|
}; |
|
|
|
static __net_init int raw_init_net(struct net *net) |
|
{ |
|
if (!proc_create_net_data("raw", 0444, net->proc_net, &raw_seq_ops, |
|
sizeof(struct raw_iter_state), &raw_v4_hashinfo)) |
|
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 */ |
|
|
|
static void raw_sysctl_init_net(struct net *net) |
|
{ |
|
#ifdef CONFIG_NET_L3_MASTER_DEV |
|
net->ipv4.sysctl_raw_l3mdev_accept = 1; |
|
#endif |
|
} |
|
|
|
static int __net_init raw_sysctl_init(struct net *net) |
|
{ |
|
raw_sysctl_init_net(net); |
|
return 0; |
|
} |
|
|
|
static struct pernet_operations __net_initdata raw_sysctl_ops = { |
|
.init = raw_sysctl_init, |
|
}; |
|
|
|
void __init raw_init(void) |
|
{ |
|
raw_sysctl_init_net(&init_net); |
|
if (register_pernet_subsys(&raw_sysctl_ops)) |
|
panic("RAW: failed to init sysctl parameters.\n"); |
|
}
|
|
|