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1319 lines
30 KiB
1319 lines
30 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
|
/* |
|
* RAW sockets for IPv6 |
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* Linux INET6 implementation |
|
* |
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* Authors: |
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* Pedro Roque <[email protected]> |
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* |
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* Adapted from linux/net/ipv4/raw.c |
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* |
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* Fixes: |
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* Hideaki YOSHIFUJI : sin6_scope_id support |
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* YOSHIFUJI,H.@USAGI : raw checksum (RFC2292(bis) compliance) |
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* Kazunori MIYAZAWA @USAGI: change process style to use ip6_append_data |
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*/ |
|
|
|
#include <linux/errno.h> |
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#include <linux/types.h> |
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#include <linux/socket.h> |
|
#include <linux/slab.h> |
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#include <linux/sockios.h> |
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#include <linux/net.h> |
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#include <linux/in6.h> |
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#include <linux/netdevice.h> |
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#include <linux/if_arp.h> |
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#include <linux/icmpv6.h> |
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#include <linux/netfilter.h> |
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#include <linux/netfilter_ipv6.h> |
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#include <linux/skbuff.h> |
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#include <linux/compat.h> |
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#include <linux/uaccess.h> |
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#include <asm/ioctls.h> |
|
|
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#include <net/net_namespace.h> |
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#include <net/ip.h> |
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#include <net/sock.h> |
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#include <net/snmp.h> |
|
|
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#include <net/ipv6.h> |
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#include <net/ndisc.h> |
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#include <net/protocol.h> |
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#include <net/ip6_route.h> |
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#include <net/ip6_checksum.h> |
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#include <net/addrconf.h> |
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#include <net/transp_v6.h> |
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#include <net/udp.h> |
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#include <net/inet_common.h> |
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#include <net/tcp_states.h> |
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#if IS_ENABLED(CONFIG_IPV6_MIP6) |
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#include <net/mip6.h> |
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#endif |
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#include <linux/mroute6.h> |
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|
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#include <net/raw.h> |
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#include <net/rawv6.h> |
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#include <net/xfrm.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/export.h> |
|
|
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#define ICMPV6_HDRLEN 4 /* ICMPv6 header, RFC 4443 Section 2.1 */ |
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|
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struct raw_hashinfo raw_v6_hashinfo; |
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EXPORT_SYMBOL_GPL(raw_v6_hashinfo); |
|
|
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bool raw_v6_match(struct net *net, struct sock *sk, unsigned short num, |
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const struct in6_addr *loc_addr, |
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const struct in6_addr *rmt_addr, int dif, int sdif) |
|
{ |
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if (inet_sk(sk)->inet_num != num || |
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!net_eq(sock_net(sk), net) || |
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(!ipv6_addr_any(&sk->sk_v6_daddr) && |
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!ipv6_addr_equal(&sk->sk_v6_daddr, rmt_addr)) || |
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!raw_sk_bound_dev_eq(net, sk->sk_bound_dev_if, |
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dif, sdif)) |
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return false; |
|
|
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if (ipv6_addr_any(&sk->sk_v6_rcv_saddr) || |
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ipv6_addr_equal(&sk->sk_v6_rcv_saddr, loc_addr) || |
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(ipv6_addr_is_multicast(loc_addr) && |
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inet6_mc_check(sk, loc_addr, rmt_addr))) |
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return true; |
|
|
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return false; |
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} |
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EXPORT_SYMBOL_GPL(raw_v6_match); |
|
|
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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 icmpv6_filter(const struct sock *sk, const struct sk_buff *skb) |
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{ |
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struct icmp6hdr _hdr; |
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const struct icmp6hdr *hdr; |
|
|
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/* We require only the four bytes of the ICMPv6 header, not any |
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* additional bytes of message body in "struct icmp6hdr". |
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*/ |
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hdr = skb_header_pointer(skb, skb_transport_offset(skb), |
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ICMPV6_HDRLEN, &_hdr); |
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if (hdr) { |
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const __u32 *data = &raw6_sk(sk)->filter.data[0]; |
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unsigned int type = hdr->icmp6_type; |
|
|
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return (data[type >> 5] & (1U << (type & 31))) != 0; |
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} |
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return 1; |
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} |
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|
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#if IS_ENABLED(CONFIG_IPV6_MIP6) |
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typedef int mh_filter_t(struct sock *sock, struct sk_buff *skb); |
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|
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static mh_filter_t __rcu *mh_filter __read_mostly; |
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|
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int rawv6_mh_filter_register(mh_filter_t filter) |
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{ |
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rcu_assign_pointer(mh_filter, filter); |
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return 0; |
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} |
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EXPORT_SYMBOL(rawv6_mh_filter_register); |
|
|
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int rawv6_mh_filter_unregister(mh_filter_t filter) |
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{ |
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RCU_INIT_POINTER(mh_filter, NULL); |
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synchronize_rcu(); |
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return 0; |
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} |
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EXPORT_SYMBOL(rawv6_mh_filter_unregister); |
|
|
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#endif |
|
|
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/* |
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* demultiplex raw sockets. |
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* (should consider queueing the skb in the sock receive_queue |
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* without calling rawv6.c) |
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* |
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* Caller owns SKB so we must make clones. |
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*/ |
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static bool ipv6_raw_deliver(struct sk_buff *skb, int nexthdr) |
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{ |
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struct net *net = dev_net(skb->dev); |
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struct hlist_nulls_head *hlist; |
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struct hlist_nulls_node *hnode; |
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const struct in6_addr *saddr; |
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const struct in6_addr *daddr; |
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struct sock *sk; |
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bool delivered = false; |
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__u8 hash; |
|
|
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saddr = &ipv6_hdr(skb)->saddr; |
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daddr = saddr + 1; |
|
|
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hash = nexthdr & (RAW_HTABLE_SIZE - 1); |
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hlist = &raw_v6_hashinfo.ht[hash]; |
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rcu_read_lock(); |
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sk_nulls_for_each(sk, hnode, hlist) { |
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int filtered; |
|
|
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if (!raw_v6_match(net, sk, nexthdr, daddr, saddr, |
|
inet6_iif(skb), inet6_sdif(skb))) |
|
continue; |
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delivered = true; |
|
switch (nexthdr) { |
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case IPPROTO_ICMPV6: |
|
filtered = icmpv6_filter(sk, skb); |
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break; |
|
|
|
#if IS_ENABLED(CONFIG_IPV6_MIP6) |
|
case IPPROTO_MH: |
|
{ |
|
/* XXX: To validate MH only once for each packet, |
|
* this is placed here. It should be after checking |
|
* xfrm policy, however it doesn't. The checking xfrm |
|
* policy is placed in rawv6_rcv() because it is |
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* required for each socket. |
|
*/ |
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mh_filter_t *filter; |
|
|
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filter = rcu_dereference(mh_filter); |
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filtered = filter ? (*filter)(sk, skb) : 0; |
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break; |
|
} |
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#endif |
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default: |
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filtered = 0; |
|
break; |
|
} |
|
|
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if (filtered < 0) |
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break; |
|
if (filtered == 0) { |
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struct sk_buff *clone = skb_clone(skb, GFP_ATOMIC); |
|
|
|
/* Not releasing hash table! */ |
|
if (clone) { |
|
nf_reset_ct(clone); |
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rawv6_rcv(sk, clone); |
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} |
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} |
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} |
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rcu_read_unlock(); |
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return delivered; |
|
} |
|
|
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bool raw6_local_deliver(struct sk_buff *skb, int nexthdr) |
|
{ |
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return ipv6_raw_deliver(skb, nexthdr); |
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} |
|
|
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/* This cleans up af_inet6 a bit. -DaveM */ |
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static int rawv6_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len) |
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{ |
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struct inet_sock *inet = inet_sk(sk); |
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struct ipv6_pinfo *np = inet6_sk(sk); |
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struct sockaddr_in6 *addr = (struct sockaddr_in6 *) uaddr; |
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__be32 v4addr = 0; |
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int addr_type; |
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int err; |
|
|
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if (addr_len < SIN6_LEN_RFC2133) |
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return -EINVAL; |
|
|
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if (addr->sin6_family != AF_INET6) |
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return -EINVAL; |
|
|
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addr_type = ipv6_addr_type(&addr->sin6_addr); |
|
|
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/* Raw sockets are IPv6 only */ |
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if (addr_type == IPV6_ADDR_MAPPED) |
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return -EADDRNOTAVAIL; |
|
|
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lock_sock(sk); |
|
|
|
err = -EINVAL; |
|
if (sk->sk_state != TCP_CLOSE) |
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goto out; |
|
|
|
rcu_read_lock(); |
|
/* Check if the address belongs to the host. */ |
|
if (addr_type != IPV6_ADDR_ANY) { |
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struct net_device *dev = NULL; |
|
|
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if (__ipv6_addr_needs_scope_id(addr_type)) { |
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if (addr_len >= sizeof(struct sockaddr_in6) && |
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addr->sin6_scope_id) { |
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/* Override any existing binding, if another |
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* one is supplied by user. |
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*/ |
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sk->sk_bound_dev_if = addr->sin6_scope_id; |
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} |
|
|
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/* Binding to link-local address requires an interface */ |
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if (!sk->sk_bound_dev_if) |
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goto out_unlock; |
|
} |
|
|
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if (sk->sk_bound_dev_if) { |
|
err = -ENODEV; |
|
dev = dev_get_by_index_rcu(sock_net(sk), |
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sk->sk_bound_dev_if); |
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if (!dev) |
|
goto out_unlock; |
|
} |
|
|
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/* ipv4 addr of the socket is invalid. Only the |
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* unspecified and mapped address have a v4 equivalent. |
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*/ |
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v4addr = LOOPBACK4_IPV6; |
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if (!(addr_type & IPV6_ADDR_MULTICAST) && |
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!ipv6_can_nonlocal_bind(sock_net(sk), inet)) { |
|
err = -EADDRNOTAVAIL; |
|
if (!ipv6_chk_addr(sock_net(sk), &addr->sin6_addr, |
|
dev, 0)) { |
|
goto out_unlock; |
|
} |
|
} |
|
} |
|
|
|
inet->inet_rcv_saddr = inet->inet_saddr = v4addr; |
|
sk->sk_v6_rcv_saddr = addr->sin6_addr; |
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if (!(addr_type & IPV6_ADDR_MULTICAST)) |
|
np->saddr = addr->sin6_addr; |
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err = 0; |
|
out_unlock: |
|
rcu_read_unlock(); |
|
out: |
|
release_sock(sk); |
|
return err; |
|
} |
|
|
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static void rawv6_err(struct sock *sk, struct sk_buff *skb, |
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struct inet6_skb_parm *opt, |
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u8 type, u8 code, int offset, __be32 info) |
|
{ |
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struct inet_sock *inet = inet_sk(sk); |
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struct ipv6_pinfo *np = inet6_sk(sk); |
|
int err; |
|
int harderr; |
|
|
|
/* Report error on raw socket, if: |
|
1. User requested recverr. |
|
2. Socket is connected (otherwise the error indication |
|
is useless without recverr and error is hard. |
|
*/ |
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if (!np->recverr && sk->sk_state != TCP_ESTABLISHED) |
|
return; |
|
|
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harderr = icmpv6_err_convert(type, code, &err); |
|
if (type == ICMPV6_PKT_TOOBIG) { |
|
ip6_sk_update_pmtu(skb, sk, info); |
|
harderr = (np->pmtudisc == IPV6_PMTUDISC_DO); |
|
} |
|
if (type == NDISC_REDIRECT) { |
|
ip6_sk_redirect(skb, sk); |
|
return; |
|
} |
|
if (np->recverr) { |
|
u8 *payload = skb->data; |
|
if (!inet->hdrincl) |
|
payload += offset; |
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ipv6_icmp_error(sk, skb, err, 0, ntohl(info), payload); |
|
} |
|
|
|
if (np->recverr || harderr) { |
|
sk->sk_err = err; |
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sk_error_report(sk); |
|
} |
|
} |
|
|
|
void raw6_icmp_error(struct sk_buff *skb, int nexthdr, |
|
u8 type, u8 code, int inner_offset, __be32 info) |
|
{ |
|
struct net *net = dev_net(skb->dev); |
|
struct hlist_nulls_head *hlist; |
|
struct hlist_nulls_node *hnode; |
|
struct sock *sk; |
|
int hash; |
|
|
|
hash = nexthdr & (RAW_HTABLE_SIZE - 1); |
|
hlist = &raw_v6_hashinfo.ht[hash]; |
|
rcu_read_lock(); |
|
sk_nulls_for_each(sk, hnode, hlist) { |
|
/* Note: ipv6_hdr(skb) != skb->data */ |
|
const struct ipv6hdr *ip6h = (const struct ipv6hdr *)skb->data; |
|
|
|
if (!raw_v6_match(net, sk, nexthdr, &ip6h->saddr, &ip6h->daddr, |
|
inet6_iif(skb), inet6_iif(skb))) |
|
continue; |
|
rawv6_err(sk, skb, NULL, type, code, inner_offset, info); |
|
} |
|
rcu_read_unlock(); |
|
} |
|
|
|
static inline int rawv6_rcv_skb(struct sock *sk, struct sk_buff *skb) |
|
{ |
|
if ((raw6_sk(sk)->checksum || rcu_access_pointer(sk->sk_filter)) && |
|
skb_checksum_complete(skb)) { |
|
atomic_inc(&sk->sk_drops); |
|
kfree_skb(skb); |
|
return NET_RX_DROP; |
|
} |
|
|
|
/* Charge it to the socket. */ |
|
skb_dst_drop(skb); |
|
if (sock_queue_rcv_skb(sk, skb) < 0) { |
|
kfree_skb(skb); |
|
return NET_RX_DROP; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
/* |
|
* This is next to useless... |
|
* if we demultiplex in network layer we don't need the extra call |
|
* just to queue the skb... |
|
* maybe we could have the network decide upon a hint if it |
|
* should call raw_rcv for demultiplexing |
|
*/ |
|
int rawv6_rcv(struct sock *sk, struct sk_buff *skb) |
|
{ |
|
struct inet_sock *inet = inet_sk(sk); |
|
struct raw6_sock *rp = raw6_sk(sk); |
|
|
|
if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) { |
|
atomic_inc(&sk->sk_drops); |
|
kfree_skb(skb); |
|
return NET_RX_DROP; |
|
} |
|
|
|
if (!rp->checksum) |
|
skb->ip_summed = CHECKSUM_UNNECESSARY; |
|
|
|
if (skb->ip_summed == CHECKSUM_COMPLETE) { |
|
skb_postpull_rcsum(skb, skb_network_header(skb), |
|
skb_network_header_len(skb)); |
|
if (!csum_ipv6_magic(&ipv6_hdr(skb)->saddr, |
|
&ipv6_hdr(skb)->daddr, |
|
skb->len, inet->inet_num, skb->csum)) |
|
skb->ip_summed = CHECKSUM_UNNECESSARY; |
|
} |
|
if (!skb_csum_unnecessary(skb)) |
|
skb->csum = ~csum_unfold(csum_ipv6_magic(&ipv6_hdr(skb)->saddr, |
|
&ipv6_hdr(skb)->daddr, |
|
skb->len, |
|
inet->inet_num, 0)); |
|
|
|
if (inet->hdrincl) { |
|
if (skb_checksum_complete(skb)) { |
|
atomic_inc(&sk->sk_drops); |
|
kfree_skb(skb); |
|
return NET_RX_DROP; |
|
} |
|
} |
|
|
|
rawv6_rcv_skb(sk, skb); |
|
return 0; |
|
} |
|
|
|
|
|
/* |
|
* This should be easy, if there is something there |
|
* we return it, otherwise we block. |
|
*/ |
|
|
|
static int rawv6_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, |
|
int flags, int *addr_len) |
|
{ |
|
struct ipv6_pinfo *np = inet6_sk(sk); |
|
DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name); |
|
struct sk_buff *skb; |
|
size_t copied; |
|
int err; |
|
|
|
if (flags & MSG_OOB) |
|
return -EOPNOTSUPP; |
|
|
|
if (flags & MSG_ERRQUEUE) |
|
return ipv6_recv_error(sk, msg, len, addr_len); |
|
|
|
if (np->rxpmtu && np->rxopt.bits.rxpmtu) |
|
return ipv6_recv_rxpmtu(sk, msg, len, addr_len); |
|
|
|
skb = skb_recv_datagram(sk, flags, &err); |
|
if (!skb) |
|
goto out; |
|
|
|
copied = skb->len; |
|
if (copied > len) { |
|
copied = len; |
|
msg->msg_flags |= MSG_TRUNC; |
|
} |
|
|
|
if (skb_csum_unnecessary(skb)) { |
|
err = skb_copy_datagram_msg(skb, 0, msg, copied); |
|
} else if (msg->msg_flags&MSG_TRUNC) { |
|
if (__skb_checksum_complete(skb)) |
|
goto csum_copy_err; |
|
err = skb_copy_datagram_msg(skb, 0, msg, copied); |
|
} else { |
|
err = skb_copy_and_csum_datagram_msg(skb, 0, msg); |
|
if (err == -EINVAL) |
|
goto csum_copy_err; |
|
} |
|
if (err) |
|
goto out_free; |
|
|
|
/* Copy the address. */ |
|
if (sin6) { |
|
sin6->sin6_family = AF_INET6; |
|
sin6->sin6_port = 0; |
|
sin6->sin6_addr = ipv6_hdr(skb)->saddr; |
|
sin6->sin6_flowinfo = 0; |
|
sin6->sin6_scope_id = ipv6_iface_scope_id(&sin6->sin6_addr, |
|
inet6_iif(skb)); |
|
*addr_len = sizeof(*sin6); |
|
} |
|
|
|
sock_recv_cmsgs(msg, sk, skb); |
|
|
|
if (np->rxopt.all) |
|
ip6_datagram_recv_ctl(sk, msg, skb); |
|
|
|
err = copied; |
|
if (flags & MSG_TRUNC) |
|
err = skb->len; |
|
|
|
out_free: |
|
skb_free_datagram(sk, skb); |
|
out: |
|
return err; |
|
|
|
csum_copy_err: |
|
skb_kill_datagram(sk, skb, flags); |
|
|
|
/* Error for blocking case is chosen to masquerade |
|
as some normal condition. |
|
*/ |
|
err = (flags&MSG_DONTWAIT) ? -EAGAIN : -EHOSTUNREACH; |
|
goto out; |
|
} |
|
|
|
static int rawv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6, |
|
struct raw6_sock *rp) |
|
{ |
|
struct sk_buff *skb; |
|
int err = 0; |
|
int offset; |
|
int len; |
|
int total_len; |
|
__wsum tmp_csum; |
|
__sum16 csum; |
|
|
|
if (!rp->checksum) |
|
goto send; |
|
|
|
skb = skb_peek(&sk->sk_write_queue); |
|
if (!skb) |
|
goto out; |
|
|
|
offset = rp->offset; |
|
total_len = inet_sk(sk)->cork.base.length; |
|
if (offset >= total_len - 1) { |
|
err = -EINVAL; |
|
ip6_flush_pending_frames(sk); |
|
goto out; |
|
} |
|
|
|
/* should be check HW csum miyazawa */ |
|
if (skb_queue_len(&sk->sk_write_queue) == 1) { |
|
/* |
|
* Only one fragment on the socket. |
|
*/ |
|
tmp_csum = skb->csum; |
|
} else { |
|
struct sk_buff *csum_skb = NULL; |
|
tmp_csum = 0; |
|
|
|
skb_queue_walk(&sk->sk_write_queue, skb) { |
|
tmp_csum = csum_add(tmp_csum, skb->csum); |
|
|
|
if (csum_skb) |
|
continue; |
|
|
|
len = skb->len - skb_transport_offset(skb); |
|
if (offset >= len) { |
|
offset -= len; |
|
continue; |
|
} |
|
|
|
csum_skb = skb; |
|
} |
|
|
|
skb = csum_skb; |
|
} |
|
|
|
offset += skb_transport_offset(skb); |
|
err = skb_copy_bits(skb, offset, &csum, 2); |
|
if (err < 0) { |
|
ip6_flush_pending_frames(sk); |
|
goto out; |
|
} |
|
|
|
/* in case cksum was not initialized */ |
|
if (unlikely(csum)) |
|
tmp_csum = csum_sub(tmp_csum, csum_unfold(csum)); |
|
|
|
csum = csum_ipv6_magic(&fl6->saddr, &fl6->daddr, |
|
total_len, fl6->flowi6_proto, tmp_csum); |
|
|
|
if (csum == 0 && fl6->flowi6_proto == IPPROTO_UDP) |
|
csum = CSUM_MANGLED_0; |
|
|
|
BUG_ON(skb_store_bits(skb, offset, &csum, 2)); |
|
|
|
send: |
|
err = ip6_push_pending_frames(sk); |
|
out: |
|
return err; |
|
} |
|
|
|
static int rawv6_send_hdrinc(struct sock *sk, struct msghdr *msg, int length, |
|
struct flowi6 *fl6, struct dst_entry **dstp, |
|
unsigned int flags, const struct sockcm_cookie *sockc) |
|
{ |
|
struct ipv6_pinfo *np = inet6_sk(sk); |
|
struct net *net = sock_net(sk); |
|
struct ipv6hdr *iph; |
|
struct sk_buff *skb; |
|
int err; |
|
struct rt6_info *rt = (struct rt6_info *)*dstp; |
|
int hlen = LL_RESERVED_SPACE(rt->dst.dev); |
|
int tlen = rt->dst.dev->needed_tailroom; |
|
|
|
if (length > rt->dst.dev->mtu) { |
|
ipv6_local_error(sk, EMSGSIZE, fl6, rt->dst.dev->mtu); |
|
return -EMSGSIZE; |
|
} |
|
if (length < sizeof(struct ipv6hdr)) |
|
return -EINVAL; |
|
if (flags&MSG_PROBE) |
|
goto out; |
|
|
|
skb = sock_alloc_send_skb(sk, |
|
length + hlen + tlen + 15, |
|
flags & MSG_DONTWAIT, &err); |
|
if (!skb) |
|
goto error; |
|
skb_reserve(skb, hlen); |
|
|
|
skb->protocol = htons(ETH_P_IPV6); |
|
skb->priority = sk->sk_priority; |
|
skb->mark = sockc->mark; |
|
skb->tstamp = sockc->transmit_time; |
|
|
|
skb_put(skb, length); |
|
skb_reset_network_header(skb); |
|
iph = ipv6_hdr(skb); |
|
|
|
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 = memcpy_from_msg(iph, msg, length); |
|
if (err) { |
|
err = -EFAULT; |
|
kfree_skb(skb); |
|
goto error; |
|
} |
|
|
|
skb_dst_set(skb, &rt->dst); |
|
*dstp = NULL; |
|
|
|
/* if egress device is enslaved to an L3 master device pass the |
|
* skb to its handler for processing |
|
*/ |
|
skb = l3mdev_ip6_out(sk, skb); |
|
if (unlikely(!skb)) |
|
return 0; |
|
|
|
/* Acquire rcu_read_lock() in case we need to use rt->rt6i_idev |
|
* in the error path. Since skb has been freed, the dst could |
|
* have been queued for deletion. |
|
*/ |
|
rcu_read_lock(); |
|
IP6_UPD_PO_STATS(net, rt->rt6i_idev, IPSTATS_MIB_OUT, skb->len); |
|
err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, net, sk, skb, |
|
NULL, rt->dst.dev, dst_output); |
|
if (err > 0) |
|
err = net_xmit_errno(err); |
|
if (err) { |
|
IP6_INC_STATS(net, rt->rt6i_idev, IPSTATS_MIB_OUTDISCARDS); |
|
rcu_read_unlock(); |
|
goto error_check; |
|
} |
|
rcu_read_unlock(); |
|
out: |
|
return 0; |
|
|
|
error: |
|
IP6_INC_STATS(net, rt->rt6i_idev, IPSTATS_MIB_OUTDISCARDS); |
|
error_check: |
|
if (err == -ENOBUFS && !np->recverr) |
|
err = 0; |
|
return err; |
|
} |
|
|
|
struct raw6_frag_vec { |
|
struct msghdr *msg; |
|
int hlen; |
|
char c[4]; |
|
}; |
|
|
|
static int rawv6_probe_proto_opt(struct raw6_frag_vec *rfv, struct flowi6 *fl6) |
|
{ |
|
int err = 0; |
|
switch (fl6->flowi6_proto) { |
|
case IPPROTO_ICMPV6: |
|
rfv->hlen = 2; |
|
err = memcpy_from_msg(rfv->c, rfv->msg, rfv->hlen); |
|
if (!err) { |
|
fl6->fl6_icmp_type = rfv->c[0]; |
|
fl6->fl6_icmp_code = rfv->c[1]; |
|
} |
|
break; |
|
case IPPROTO_MH: |
|
rfv->hlen = 4; |
|
err = memcpy_from_msg(rfv->c, rfv->msg, rfv->hlen); |
|
if (!err) |
|
fl6->fl6_mh_type = rfv->c[2]; |
|
} |
|
return err; |
|
} |
|
|
|
static int raw6_getfrag(void *from, char *to, int offset, int len, int odd, |
|
struct sk_buff *skb) |
|
{ |
|
struct raw6_frag_vec *rfv = from; |
|
|
|
if (offset < rfv->hlen) { |
|
int copy = min(rfv->hlen - offset, len); |
|
|
|
if (skb->ip_summed == CHECKSUM_PARTIAL) |
|
memcpy(to, rfv->c + offset, copy); |
|
else |
|
skb->csum = csum_block_add( |
|
skb->csum, |
|
csum_partial_copy_nocheck(rfv->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 rawv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len) |
|
{ |
|
struct ipv6_txoptions *opt_to_free = NULL; |
|
struct ipv6_txoptions opt_space; |
|
DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name); |
|
struct in6_addr *daddr, *final_p, final; |
|
struct inet_sock *inet = inet_sk(sk); |
|
struct ipv6_pinfo *np = inet6_sk(sk); |
|
struct raw6_sock *rp = raw6_sk(sk); |
|
struct ipv6_txoptions *opt = NULL; |
|
struct ip6_flowlabel *flowlabel = NULL; |
|
struct dst_entry *dst = NULL; |
|
struct raw6_frag_vec rfv; |
|
struct flowi6 fl6; |
|
struct ipcm6_cookie ipc6; |
|
int addr_len = msg->msg_namelen; |
|
int hdrincl; |
|
u16 proto; |
|
int err; |
|
|
|
/* Rough check on arithmetic overflow, |
|
better check is made in ip6_append_data(). |
|
*/ |
|
if (len > INT_MAX) |
|
return -EMSGSIZE; |
|
|
|
/* Mirror BSD error message compatibility */ |
|
if (msg->msg_flags & MSG_OOB) |
|
return -EOPNOTSUPP; |
|
|
|
/* 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); |
|
|
|
/* |
|
* Get and verify the address. |
|
*/ |
|
memset(&fl6, 0, sizeof(fl6)); |
|
|
|
fl6.flowi6_mark = sk->sk_mark; |
|
fl6.flowi6_uid = sk->sk_uid; |
|
|
|
ipcm6_init(&ipc6); |
|
ipc6.sockc.tsflags = sk->sk_tsflags; |
|
ipc6.sockc.mark = sk->sk_mark; |
|
|
|
if (sin6) { |
|
if (addr_len < SIN6_LEN_RFC2133) |
|
return -EINVAL; |
|
|
|
if (sin6->sin6_family && sin6->sin6_family != AF_INET6) |
|
return -EAFNOSUPPORT; |
|
|
|
/* port is the proto value [0..255] carried in nexthdr */ |
|
proto = ntohs(sin6->sin6_port); |
|
|
|
if (!proto) |
|
proto = inet->inet_num; |
|
else if (proto != inet->inet_num) |
|
return -EINVAL; |
|
|
|
if (proto > 255) |
|
return -EINVAL; |
|
|
|
daddr = &sin6->sin6_addr; |
|
if (np->sndflow) { |
|
fl6.flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK; |
|
if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) { |
|
flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); |
|
if (IS_ERR(flowlabel)) |
|
return -EINVAL; |
|
} |
|
} |
|
|
|
/* |
|
* Otherwise it will be difficult to maintain |
|
* sk->sk_dst_cache. |
|
*/ |
|
if (sk->sk_state == TCP_ESTABLISHED && |
|
ipv6_addr_equal(daddr, &sk->sk_v6_daddr)) |
|
daddr = &sk->sk_v6_daddr; |
|
|
|
if (addr_len >= sizeof(struct sockaddr_in6) && |
|
sin6->sin6_scope_id && |
|
__ipv6_addr_needs_scope_id(__ipv6_addr_type(daddr))) |
|
fl6.flowi6_oif = sin6->sin6_scope_id; |
|
} else { |
|
if (sk->sk_state != TCP_ESTABLISHED) |
|
return -EDESTADDRREQ; |
|
|
|
proto = inet->inet_num; |
|
daddr = &sk->sk_v6_daddr; |
|
fl6.flowlabel = np->flow_label; |
|
} |
|
|
|
if (fl6.flowi6_oif == 0) |
|
fl6.flowi6_oif = sk->sk_bound_dev_if; |
|
|
|
if (msg->msg_controllen) { |
|
opt = &opt_space; |
|
memset(opt, 0, sizeof(struct ipv6_txoptions)); |
|
opt->tot_len = sizeof(struct ipv6_txoptions); |
|
ipc6.opt = opt; |
|
|
|
err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, &fl6, &ipc6); |
|
if (err < 0) { |
|
fl6_sock_release(flowlabel); |
|
return err; |
|
} |
|
if ((fl6.flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) { |
|
flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); |
|
if (IS_ERR(flowlabel)) |
|
return -EINVAL; |
|
} |
|
if (!(opt->opt_nflen|opt->opt_flen)) |
|
opt = NULL; |
|
} |
|
if (!opt) { |
|
opt = txopt_get(np); |
|
opt_to_free = opt; |
|
} |
|
if (flowlabel) |
|
opt = fl6_merge_options(&opt_space, flowlabel, opt); |
|
opt = ipv6_fixup_options(&opt_space, opt); |
|
|
|
fl6.flowi6_proto = proto; |
|
fl6.flowi6_mark = ipc6.sockc.mark; |
|
|
|
if (!hdrincl) { |
|
rfv.msg = msg; |
|
rfv.hlen = 0; |
|
err = rawv6_probe_proto_opt(&rfv, &fl6); |
|
if (err) |
|
goto out; |
|
} |
|
|
|
if (!ipv6_addr_any(daddr)) |
|
fl6.daddr = *daddr; |
|
else |
|
fl6.daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */ |
|
if (ipv6_addr_any(&fl6.saddr) && !ipv6_addr_any(&np->saddr)) |
|
fl6.saddr = np->saddr; |
|
|
|
final_p = fl6_update_dst(&fl6, opt, &final); |
|
|
|
if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) |
|
fl6.flowi6_oif = np->mcast_oif; |
|
else if (!fl6.flowi6_oif) |
|
fl6.flowi6_oif = np->ucast_oif; |
|
security_sk_classify_flow(sk, flowi6_to_flowi_common(&fl6)); |
|
|
|
if (hdrincl) |
|
fl6.flowi6_flags |= FLOWI_FLAG_KNOWN_NH; |
|
|
|
if (ipc6.tclass < 0) |
|
ipc6.tclass = np->tclass; |
|
|
|
fl6.flowlabel = ip6_make_flowinfo(ipc6.tclass, fl6.flowlabel); |
|
|
|
dst = ip6_dst_lookup_flow(sock_net(sk), sk, &fl6, final_p); |
|
if (IS_ERR(dst)) { |
|
err = PTR_ERR(dst); |
|
goto out; |
|
} |
|
if (ipc6.hlimit < 0) |
|
ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst); |
|
|
|
if (ipc6.dontfrag < 0) |
|
ipc6.dontfrag = np->dontfrag; |
|
|
|
if (msg->msg_flags&MSG_CONFIRM) |
|
goto do_confirm; |
|
|
|
back_from_confirm: |
|
if (hdrincl) |
|
err = rawv6_send_hdrinc(sk, msg, len, &fl6, &dst, |
|
msg->msg_flags, &ipc6.sockc); |
|
else { |
|
ipc6.opt = opt; |
|
lock_sock(sk); |
|
err = ip6_append_data(sk, raw6_getfrag, &rfv, |
|
len, 0, &ipc6, &fl6, (struct rt6_info *)dst, |
|
msg->msg_flags); |
|
|
|
if (err) |
|
ip6_flush_pending_frames(sk); |
|
else if (!(msg->msg_flags & MSG_MORE)) |
|
err = rawv6_push_pending_frames(sk, &fl6, rp); |
|
release_sock(sk); |
|
} |
|
done: |
|
dst_release(dst); |
|
out: |
|
fl6_sock_release(flowlabel); |
|
txopt_put(opt_to_free); |
|
return err < 0 ? err : len; |
|
do_confirm: |
|
if (msg->msg_flags & MSG_PROBE) |
|
dst_confirm_neigh(dst, &fl6.daddr); |
|
if (!(msg->msg_flags & MSG_PROBE) || len) |
|
goto back_from_confirm; |
|
err = 0; |
|
goto done; |
|
} |
|
|
|
static int rawv6_seticmpfilter(struct sock *sk, int level, int optname, |
|
sockptr_t optval, int optlen) |
|
{ |
|
switch (optname) { |
|
case ICMPV6_FILTER: |
|
if (optlen > sizeof(struct icmp6_filter)) |
|
optlen = sizeof(struct icmp6_filter); |
|
if (copy_from_sockptr(&raw6_sk(sk)->filter, optval, optlen)) |
|
return -EFAULT; |
|
return 0; |
|
default: |
|
return -ENOPROTOOPT; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static int rawv6_geticmpfilter(struct sock *sk, int level, int optname, |
|
char __user *optval, int __user *optlen) |
|
{ |
|
int len; |
|
|
|
switch (optname) { |
|
case ICMPV6_FILTER: |
|
if (get_user(len, optlen)) |
|
return -EFAULT; |
|
if (len < 0) |
|
return -EINVAL; |
|
if (len > sizeof(struct icmp6_filter)) |
|
len = sizeof(struct icmp6_filter); |
|
if (put_user(len, optlen)) |
|
return -EFAULT; |
|
if (copy_to_user(optval, &raw6_sk(sk)->filter, len)) |
|
return -EFAULT; |
|
return 0; |
|
default: |
|
return -ENOPROTOOPT; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
|
|
static int do_rawv6_setsockopt(struct sock *sk, int level, int optname, |
|
sockptr_t optval, unsigned int optlen) |
|
{ |
|
struct raw6_sock *rp = raw6_sk(sk); |
|
int val; |
|
|
|
if (optlen < sizeof(val)) |
|
return -EINVAL; |
|
|
|
if (copy_from_sockptr(&val, optval, sizeof(val))) |
|
return -EFAULT; |
|
|
|
switch (optname) { |
|
case IPV6_HDRINCL: |
|
if (sk->sk_type != SOCK_RAW) |
|
return -EINVAL; |
|
inet_sk(sk)->hdrincl = !!val; |
|
return 0; |
|
case IPV6_CHECKSUM: |
|
if (inet_sk(sk)->inet_num == IPPROTO_ICMPV6 && |
|
level == IPPROTO_IPV6) { |
|
/* |
|
* RFC3542 tells that IPV6_CHECKSUM socket |
|
* option in the IPPROTO_IPV6 level is not |
|
* allowed on ICMPv6 sockets. |
|
* If you want to set it, use IPPROTO_RAW |
|
* level IPV6_CHECKSUM socket option |
|
* (Linux extension). |
|
*/ |
|
return -EINVAL; |
|
} |
|
|
|
/* You may get strange result with a positive odd offset; |
|
RFC2292bis agrees with me. */ |
|
if (val > 0 && (val&1)) |
|
return -EINVAL; |
|
if (val < 0) { |
|
rp->checksum = 0; |
|
} else { |
|
rp->checksum = 1; |
|
rp->offset = val; |
|
} |
|
|
|
return 0; |
|
|
|
default: |
|
return -ENOPROTOOPT; |
|
} |
|
} |
|
|
|
static int rawv6_setsockopt(struct sock *sk, int level, int optname, |
|
sockptr_t optval, unsigned int optlen) |
|
{ |
|
switch (level) { |
|
case SOL_RAW: |
|
break; |
|
|
|
case SOL_ICMPV6: |
|
if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6) |
|
return -EOPNOTSUPP; |
|
return rawv6_seticmpfilter(sk, level, optname, optval, optlen); |
|
case SOL_IPV6: |
|
if (optname == IPV6_CHECKSUM || |
|
optname == IPV6_HDRINCL) |
|
break; |
|
fallthrough; |
|
default: |
|
return ipv6_setsockopt(sk, level, optname, optval, optlen); |
|
} |
|
|
|
return do_rawv6_setsockopt(sk, level, optname, optval, optlen); |
|
} |
|
|
|
static int do_rawv6_getsockopt(struct sock *sk, int level, int optname, |
|
char __user *optval, int __user *optlen) |
|
{ |
|
struct raw6_sock *rp = raw6_sk(sk); |
|
int val, len; |
|
|
|
if (get_user(len, optlen)) |
|
return -EFAULT; |
|
|
|
switch (optname) { |
|
case IPV6_HDRINCL: |
|
val = inet_sk(sk)->hdrincl; |
|
break; |
|
case IPV6_CHECKSUM: |
|
/* |
|
* We allow getsockopt() for IPPROTO_IPV6-level |
|
* IPV6_CHECKSUM socket option on ICMPv6 sockets |
|
* since RFC3542 is silent about it. |
|
*/ |
|
if (rp->checksum == 0) |
|
val = -1; |
|
else |
|
val = rp->offset; |
|
break; |
|
|
|
default: |
|
return -ENOPROTOOPT; |
|
} |
|
|
|
len = min_t(unsigned int, sizeof(int), len); |
|
|
|
if (put_user(len, optlen)) |
|
return -EFAULT; |
|
if (copy_to_user(optval, &val, len)) |
|
return -EFAULT; |
|
return 0; |
|
} |
|
|
|
static int rawv6_getsockopt(struct sock *sk, int level, int optname, |
|
char __user *optval, int __user *optlen) |
|
{ |
|
switch (level) { |
|
case SOL_RAW: |
|
break; |
|
|
|
case SOL_ICMPV6: |
|
if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6) |
|
return -EOPNOTSUPP; |
|
return rawv6_geticmpfilter(sk, level, optname, optval, optlen); |
|
case SOL_IPV6: |
|
if (optname == IPV6_CHECKSUM || |
|
optname == IPV6_HDRINCL) |
|
break; |
|
fallthrough; |
|
default: |
|
return ipv6_getsockopt(sk, level, optname, optval, optlen); |
|
} |
|
|
|
return do_rawv6_getsockopt(sk, level, optname, optval, optlen); |
|
} |
|
|
|
static int rawv6_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_IPV6_MROUTE |
|
return ip6mr_ioctl(sk, cmd, (void __user *)arg); |
|
#else |
|
return -ENOIOCTLCMD; |
|
#endif |
|
} |
|
} |
|
|
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#ifdef CONFIG_COMPAT |
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static int compat_rawv6_ioctl(struct sock *sk, unsigned int cmd, unsigned long arg) |
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{ |
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switch (cmd) { |
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case SIOCOUTQ: |
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case SIOCINQ: |
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return -ENOIOCTLCMD; |
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default: |
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#ifdef CONFIG_IPV6_MROUTE |
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return ip6mr_compat_ioctl(sk, cmd, compat_ptr(arg)); |
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#else |
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return -ENOIOCTLCMD; |
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#endif |
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} |
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} |
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#endif |
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|
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static void rawv6_close(struct sock *sk, long timeout) |
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{ |
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if (inet_sk(sk)->inet_num == IPPROTO_RAW) |
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ip6_ra_control(sk, -1); |
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ip6mr_sk_done(sk); |
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sk_common_release(sk); |
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} |
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|
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static void raw6_destroy(struct sock *sk) |
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{ |
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lock_sock(sk); |
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ip6_flush_pending_frames(sk); |
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release_sock(sk); |
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|
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inet6_destroy_sock(sk); |
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} |
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|
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static int rawv6_init_sk(struct sock *sk) |
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{ |
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struct raw6_sock *rp = raw6_sk(sk); |
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|
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switch (inet_sk(sk)->inet_num) { |
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case IPPROTO_ICMPV6: |
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rp->checksum = 1; |
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rp->offset = 2; |
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break; |
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case IPPROTO_MH: |
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rp->checksum = 1; |
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rp->offset = 4; |
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break; |
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default: |
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break; |
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} |
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return 0; |
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} |
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|
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struct proto rawv6_prot = { |
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.name = "RAWv6", |
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.owner = THIS_MODULE, |
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.close = rawv6_close, |
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.destroy = raw6_destroy, |
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.connect = ip6_datagram_connect_v6_only, |
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.disconnect = __udp_disconnect, |
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.ioctl = rawv6_ioctl, |
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.init = rawv6_init_sk, |
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.setsockopt = rawv6_setsockopt, |
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.getsockopt = rawv6_getsockopt, |
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.sendmsg = rawv6_sendmsg, |
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.recvmsg = rawv6_recvmsg, |
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.bind = rawv6_bind, |
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.backlog_rcv = rawv6_rcv_skb, |
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.hash = raw_hash_sk, |
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.unhash = raw_unhash_sk, |
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.obj_size = sizeof(struct raw6_sock), |
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.useroffset = offsetof(struct raw6_sock, filter), |
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.usersize = sizeof_field(struct raw6_sock, filter), |
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.h.raw_hash = &raw_v6_hashinfo, |
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#ifdef CONFIG_COMPAT |
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.compat_ioctl = compat_rawv6_ioctl, |
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#endif |
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.diag_destroy = raw_abort, |
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}; |
|
|
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#ifdef CONFIG_PROC_FS |
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static int raw6_seq_show(struct seq_file *seq, void *v) |
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{ |
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if (v == SEQ_START_TOKEN) { |
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seq_puts(seq, IPV6_SEQ_DGRAM_HEADER); |
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} else { |
|
struct sock *sp = v; |
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__u16 srcp = inet_sk(sp)->inet_num; |
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ip6_dgram_sock_seq_show(seq, v, srcp, 0, |
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raw_seq_private(seq)->bucket); |
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} |
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return 0; |
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} |
|
|
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static const struct seq_operations raw6_seq_ops = { |
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.start = raw_seq_start, |
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.next = raw_seq_next, |
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.stop = raw_seq_stop, |
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.show = raw6_seq_show, |
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}; |
|
|
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static int __net_init raw6_init_net(struct net *net) |
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{ |
|
if (!proc_create_net_data("raw6", 0444, net->proc_net, &raw6_seq_ops, |
|
sizeof(struct raw_iter_state), &raw_v6_hashinfo)) |
|
return -ENOMEM; |
|
|
|
return 0; |
|
} |
|
|
|
static void __net_exit raw6_exit_net(struct net *net) |
|
{ |
|
remove_proc_entry("raw6", net->proc_net); |
|
} |
|
|
|
static struct pernet_operations raw6_net_ops = { |
|
.init = raw6_init_net, |
|
.exit = raw6_exit_net, |
|
}; |
|
|
|
int __init raw6_proc_init(void) |
|
{ |
|
return register_pernet_subsys(&raw6_net_ops); |
|
} |
|
|
|
void raw6_proc_exit(void) |
|
{ |
|
unregister_pernet_subsys(&raw6_net_ops); |
|
} |
|
#endif /* CONFIG_PROC_FS */ |
|
|
|
/* Same as inet6_dgram_ops, sans udp_poll. */ |
|
const struct proto_ops inet6_sockraw_ops = { |
|
.family = PF_INET6, |
|
.owner = THIS_MODULE, |
|
.release = inet6_release, |
|
.bind = inet6_bind, |
|
.connect = inet_dgram_connect, /* ok */ |
|
.socketpair = sock_no_socketpair, /* a do nothing */ |
|
.accept = sock_no_accept, /* a do nothing */ |
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.getname = inet6_getname, |
|
.poll = datagram_poll, /* ok */ |
|
.ioctl = inet6_ioctl, /* must change */ |
|
.gettstamp = sock_gettstamp, |
|
.listen = sock_no_listen, /* ok */ |
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.shutdown = inet_shutdown, /* ok */ |
|
.setsockopt = sock_common_setsockopt, /* ok */ |
|
.getsockopt = sock_common_getsockopt, /* ok */ |
|
.sendmsg = inet_sendmsg, /* ok */ |
|
.recvmsg = sock_common_recvmsg, /* ok */ |
|
.mmap = sock_no_mmap, |
|
.sendpage = sock_no_sendpage, |
|
#ifdef CONFIG_COMPAT |
|
.compat_ioctl = inet6_compat_ioctl, |
|
#endif |
|
}; |
|
|
|
static struct inet_protosw rawv6_protosw = { |
|
.type = SOCK_RAW, |
|
.protocol = IPPROTO_IP, /* wild card */ |
|
.prot = &rawv6_prot, |
|
.ops = &inet6_sockraw_ops, |
|
.flags = INET_PROTOSW_REUSE, |
|
}; |
|
|
|
int __init rawv6_init(void) |
|
{ |
|
return inet6_register_protosw(&rawv6_protosw); |
|
} |
|
|
|
void rawv6_exit(void) |
|
{ |
|
inet6_unregister_protosw(&rawv6_protosw); |
|
}
|
|
|