microsoft
/
WSL2-Linux-Kernel
зеркало из https://github.com/microsoft/WSL2-Linux-Kernel.git
1
0
Форкнуть 0
Код Задачи Пакеты Проекты Релизы Вики Активность
WSL2-Linux-Kernel/net/ipv6/raw.c

1282 строки
28 KiB
C
Исходник Ответственный История

/*
* RAW sockets for IPv6
* Linux INET6 implementation
*
* Authors:
* Pedro Roque <roque@di.fc.ul.pt>
*
* Adapted from linux/net/ipv4/raw.c
*
* $Id: raw.c,v 1.51 2002/02/01 22:01:04 davem Exp $
*
* Fixes:
* Hideaki YOSHIFUJI : sin6_scope_id support
* YOSHIFUJI,H.@USAGI : raw checksum (RFC2292(bis) compliance)
* Kazunori MIYAZAWA @USAGI: change process style to use ip6_append_data
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/socket.h>
#include <linux/sockios.h>
#include <linux/sched.h>
#include <linux/net.h>
#include <linux/in6.h>
#include <linux/netdevice.h>
#include <linux/if_arp.h>
#include <linux/icmpv6.h>
#include <linux/netfilter.h>
#include <linux/netfilter_ipv6.h>
#include <linux/skbuff.h>
#include <asm/uaccess.h>
#include <asm/ioctls.h>
#include <net/ip.h>
#include <net/sock.h>
#include <net/snmp.h>
#include <net/ipv6.h>
#include <net/ndisc.h>
#include <net/protocol.h>
#include <net/ip6_route.h>
#include <net/ip6_checksum.h>
#include <net/addrconf.h>
#include <net/transp_v6.h>
#include <net/udp.h>
#include <net/inet_common.h>
#include <net/tcp_states.h>
#ifdef CONFIG_IPV6_MIP6
#include <net/mip6.h>
#endif
#include <net/rawv6.h>
#include <net/xfrm.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
struct hlist_head raw_v6_htable[RAWV6_HTABLE_SIZE];
DEFINE_RWLOCK(raw_v6_lock);
static void raw_v6_hash(struct sock *sk)
{
struct hlist_head *list = &raw_v6_htable[inet_sk(sk)->num &
(RAWV6_HTABLE_SIZE - 1)];
write_lock_bh(&raw_v6_lock);
sk_add_node(sk, list);
sock_prot_inc_use(sk->sk_prot);
write_unlock_bh(&raw_v6_lock);
}
static void raw_v6_unhash(struct sock *sk)
{
write_lock_bh(&raw_v6_lock);
if (sk_del_node_init(sk))
sock_prot_dec_use(sk->sk_prot);
write_unlock_bh(&raw_v6_lock);
}
/* Grumble... icmp and ip_input want to get at this... */
struct sock *__raw_v6_lookup(struct sock *sk, unsigned short num,
struct in6_addr *loc_addr, struct in6_addr *rmt_addr,
int dif)
{
struct hlist_node *node;
int is_multicast = ipv6_addr_is_multicast(loc_addr);
sk_for_each_from(sk, node)
if (inet_sk(sk)->num == num) {
struct ipv6_pinfo *np = inet6_sk(sk);
if (!ipv6_addr_any(&np->daddr) &&
!ipv6_addr_equal(&np->daddr, rmt_addr))
continue;
if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif)
continue;
if (!ipv6_addr_any(&np->rcv_saddr)) {
if (ipv6_addr_equal(&np->rcv_saddr, loc_addr))
goto found;
if (is_multicast &&
inet6_mc_check(sk, loc_addr, rmt_addr))
goto found;
continue;
}
goto found;
}
sk = NULL;
found:
return sk;
}
/*
* 0 - deliver
* 1 - block
*/
static __inline__ int icmpv6_filter(struct sock *sk, struct sk_buff *skb)
{
struct icmp6hdr *icmph;
struct raw6_sock *rp = raw6_sk(sk);
if (pskb_may_pull(skb, sizeof(struct icmp6hdr))) {
__u32 *data = &rp->filter.data[0];
int bit_nr;
icmph = (struct icmp6hdr *) skb->data;
bit_nr = icmph->icmp6_type;
return (data[bit_nr >> 5] & (1 << (bit_nr & 31))) != 0;
}
return 0;
}
/*
* demultiplex raw sockets.
* (should consider queueing the skb in the sock receive_queue
* without calling rawv6.c)
*
* Caller owns SKB so we must make clones.
*/
int ipv6_raw_deliver(struct sk_buff *skb, int nexthdr)
{
struct in6_addr *saddr;
struct in6_addr *daddr;
struct sock *sk;
int delivered = 0;
__u8 hash;
saddr = &skb->nh.ipv6h->saddr;
daddr = saddr + 1;
hash = nexthdr & (MAX_INET_PROTOS - 1);
read_lock(&raw_v6_lock);
sk = sk_head(&raw_v6_htable[hash]);
/*
* The first socket found will be delivered after
* delivery to transport protocols.
*/
if (sk == NULL)
goto out;
sk = __raw_v6_lookup(sk, nexthdr, daddr, saddr, IP6CB(skb)->iif);
while (sk) {
int filtered;
delivered = 1;
switch (nexthdr) {
case IPPROTO_ICMPV6:
filtered = icmpv6_filter(sk, skb);
break;
#ifdef 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
* required for each socket.
*/
filtered = mip6_mh_filter(sk, skb);
break;
#endif
default:
filtered = 0;
break;
}
if (filtered < 0)
break;
if (filtered == 0) {
struct sk_buff *clone = skb_clone(skb, GFP_ATOMIC);
/* Not releasing hash table! */
if (clone) {
nf_reset(clone);
rawv6_rcv(sk, clone);
}
}
sk = __raw_v6_lookup(sk_next(sk), nexthdr, daddr, saddr,
IP6CB(skb)->iif);
}
out:
read_unlock(&raw_v6_lock);
return delivered;
}
/* This cleans up af_inet6 a bit. -DaveM */
static int rawv6_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
{
struct inet_sock *inet = inet_sk(sk);
struct ipv6_pinfo *np = inet6_sk(sk);
struct sockaddr_in6 *addr = (struct sockaddr_in6 *) uaddr;
__u32 v4addr = 0;
int addr_type;
int err;
if (addr_len < SIN6_LEN_RFC2133)
return -EINVAL;
addr_type = ipv6_addr_type(&addr->sin6_addr);
/* Raw sockets are IPv6 only */
if (addr_type == IPV6_ADDR_MAPPED)
return(-EADDRNOTAVAIL);
lock_sock(sk);
err = -EINVAL;
if (sk->sk_state != TCP_CLOSE)
goto out;
/* Check if the address belongs to the host. */
if (addr_type != IPV6_ADDR_ANY) {
struct net_device *dev = NULL;
if (addr_type & IPV6_ADDR_LINKLOCAL) {
if (addr_len >= sizeof(struct sockaddr_in6) &&
addr->sin6_scope_id) {
/* Override any existing binding, if another
* one is supplied by user.
*/
sk->sk_bound_dev_if = addr->sin6_scope_id;
}
/* Binding to link-local address requires an interface */
if (!sk->sk_bound_dev_if)
goto out;
dev = dev_get_by_index(sk->sk_bound_dev_if);
if (!dev) {
err = -ENODEV;
goto out;
}
}
/* ipv4 addr of the socket is invalid. Only the
* unspecified and mapped address have a v4 equivalent.
*/
v4addr = LOOPBACK4_IPV6;
if (!(addr_type & IPV6_ADDR_MULTICAST)) {
err = -EADDRNOTAVAIL;
if (!ipv6_chk_addr(&addr->sin6_addr, dev, 0)) {
if (dev)
dev_put(dev);
goto out;
}
}
if (dev)
dev_put(dev);
}
inet->rcv_saddr = inet->saddr = v4addr;
ipv6_addr_copy(&np->rcv_saddr, &addr->sin6_addr);
if (!(addr_type & IPV6_ADDR_MULTICAST))
ipv6_addr_copy(&np->saddr, &addr->sin6_addr);
err = 0;
out:
release_sock(sk);
return err;
}
void rawv6_err(struct sock *sk, struct sk_buff *skb,
struct inet6_skb_parm *opt,
int type, int code, int offset, u32 info)
{
struct inet_sock *inet = inet_sk(sk);
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.
*/
if (!np->recverr && sk->sk_state != TCP_ESTABLISHED)
return;
harderr = icmpv6_err_convert(type, code, &err);
if (type == ICMPV6_PKT_TOOBIG)
harderr = (np->pmtudisc == IPV6_PMTUDISC_DO);
if (np->recverr) {
u8 *payload = skb->data;
if (!inet->hdrincl)
payload += offset;
ipv6_icmp_error(sk, skb, err, 0, ntohl(info), payload);
}
if (np->recverr || harderr) {
sk->sk_err = err;
sk->sk_error_report(sk);
}
}
static inline int rawv6_rcv_skb(struct sock * sk, struct sk_buff * skb)
{
if ((raw6_sk(sk)->checksum || sk->sk_filter) &&
skb_checksum_complete(skb)) {
/* FIXME: increment a raw6 drops counter here */
kfree_skb(skb);
return 0;
}
/* Charge it to the socket. */
if (sock_queue_rcv_skb(sk,skb)<0) {
/* FIXME: increment a raw6 drops counter here */
kfree_skb(skb);
return 0;
}
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)) {
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->nh.raw,
skb->h.raw - skb->nh.raw);
if (!csum_ipv6_magic(&skb->nh.ipv6h->saddr,
&skb->nh.ipv6h->daddr,
skb->len, inet->num, skb->csum))
skb->ip_summed = CHECKSUM_UNNECESSARY;
}
if (skb->ip_summed != CHECKSUM_UNNECESSARY)
skb->csum = ~csum_ipv6_magic(&skb->nh.ipv6h->saddr,
&skb->nh.ipv6h->daddr,
skb->len, inet->num, 0);
if (inet->hdrincl) {
if (skb_checksum_complete(skb)) {
/* FIXME: increment a raw6 drops counter here */
kfree_skb(skb);
return 0;
}
}
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 kiocb *iocb, struct sock *sk,
struct msghdr *msg, size_t len,
int noblock, int flags, int *addr_len)
{
struct ipv6_pinfo *np = inet6_sk(sk);
struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)msg->msg_name;
struct sk_buff *skb;
size_t copied;
int err;
if (flags & MSG_OOB)
return -EOPNOTSUPP;
if (addr_len)
*addr_len=sizeof(*sin6);
if (flags & MSG_ERRQUEUE)
return ipv6_recv_error(sk, msg, len);
skb = skb_recv_datagram(sk, flags, noblock, &err);
if (!skb)
goto out;
copied = skb->len;
if (copied > len) {
copied = len;
msg->msg_flags |= MSG_TRUNC;
}
if (skb->ip_summed==CHECKSUM_UNNECESSARY) {
err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
} else if (msg->msg_flags&MSG_TRUNC) {
if (__skb_checksum_complete(skb))
goto csum_copy_err;
err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
} else {
err = skb_copy_and_csum_datagram_iovec(skb, 0, msg->msg_iov);
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;
ipv6_addr_copy(&sin6->sin6_addr, &skb->nh.ipv6h->saddr);
sin6->sin6_flowinfo = 0;
sin6->sin6_scope_id = 0;
if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
sin6->sin6_scope_id = IP6CB(skb)->iif;
}
sock_recv_timestamp(msg, sk, skb);
if (np->rxopt.all)
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;
/* FIXME: increment a raw6 drops counter here */
goto out;
}
static int rawv6_push_pending_frames(struct sock *sk, struct flowi *fl,
struct raw6_sock *rp)
{
struct sk_buff *skb;
int err = 0;
int offset;
int len;
int total_len;
u32 tmp_csum;
u16 csum;
if (!rp->checksum)
goto send;
if ((skb = skb_peek(&sk->sk_write_queue)) == NULL)
goto out;
offset = rp->offset;
total_len = inet_sk(sk)->cork.length - (skb->nh.raw - skb->data);
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->h.raw - skb->data);
if (offset >= len) {
offset -= len;
continue;
}
csum_skb = skb;
}
skb = csum_skb;
}
offset += skb->h.raw - skb->data;
if (skb_copy_bits(skb, offset, &csum, 2))
BUG();
/* in case cksum was not initialized */
if (unlikely(csum))
tmp_csum = csum_sub(tmp_csum, csum);
tmp_csum = csum_ipv6_magic(&fl->fl6_src,
&fl->fl6_dst,
total_len, fl->proto, tmp_csum);
if (tmp_csum == 0)
tmp_csum = -1;
csum = tmp_csum;
if (skb_store_bits(skb, offset, &csum, 2))
BUG();
send:
err = ip6_push_pending_frames(sk);
out:
return err;
}
static int rawv6_send_hdrinc(struct sock *sk, void *from, int length,
struct flowi *fl, struct rt6_info *rt,
unsigned int flags)
{
struct ipv6_pinfo *np = inet6_sk(sk);
struct ipv6hdr *iph;
struct sk_buff *skb;
unsigned int hh_len;
int err;
if (length > rt->u.dst.dev->mtu) {
ipv6_local_error(sk, EMSGSIZE, fl, rt->u.dst.dev->mtu);
return -EMSGSIZE;
}
if (flags&MSG_PROBE)
goto out;
hh_len = LL_RESERVED_SPACE(rt->u.dst.dev);
skb = sock_alloc_send_skb(sk, length+hh_len+15,
flags&MSG_DONTWAIT, &err);
if (skb == NULL)
goto error;
skb_reserve(skb, hh_len);
skb->priority = sk->sk_priority;
skb->dst = dst_clone(&rt->u.dst);
skb->nh.ipv6h = iph = (struct ipv6hdr *)skb_put(skb, length);
skb->ip_summed = CHECKSUM_NONE;
skb->h.raw = skb->nh.raw;
err = memcpy_fromiovecend((void *)iph, from, 0, length);
if (err)
goto error_fault;
IP6_INC_STATS(IPSTATS_MIB_OUTREQUESTS);
err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, rt->u.dst.dev,
dst_output);
if (err > 0)
err = np->recverr ? net_xmit_errno(err) : 0;
if (err)
goto error;
out:
return 0;
error_fault:
err = -EFAULT;
kfree_skb(skb);
error:
IP6_INC_STATS(IPSTATS_MIB_OUTDISCARDS);
return err;
}
static void rawv6_probe_proto_opt(struct flowi *fl, struct msghdr *msg)
{
struct iovec *iov;
u8 __user *type = NULL;
u8 __user *code = NULL;
#ifdef CONFIG_IPV6_MIP6
u8 len = 0;
#endif
int probed = 0;
int i;
if (!msg->msg_iov)
return;
for (i = 0; i < msg->msg_iovlen; i++) {
iov = &msg->msg_iov[i];
if (!iov)
continue;
switch (fl->proto) {
case IPPROTO_ICMPV6:
/* check if one-byte field is readable or not. */
if (iov->iov_base && iov->iov_len < 1)
break;
if (!type) {
type = iov->iov_base;
/* check if code field is readable or not. */
if (iov->iov_len > 1)
code = type + 1;
} else if (!code)
code = iov->iov_base;
if (type && code) {
get_user(fl->fl_icmp_type, type);
get_user(fl->fl_icmp_code, code);
probed = 1;
}
break;
#ifdef CONFIG_IPV6_MIP6
case IPPROTO_MH:
if (iov->iov_base && iov->iov_len < 1)
break;
/* check if type field is readable or not. */
if (iov->iov_len > 2 - len) {
u8 __user *p = iov->iov_base;
get_user(fl->fl_mh_type, &p[2 - len]);
probed = 1;
} else
len += iov->iov_len;
break;
#endif
default:
probed = 1;
break;
}
if (probed)
break;
}
}
static int rawv6_sendmsg(struct kiocb *iocb, struct sock *sk,
struct msghdr *msg, size_t len)
{
struct ipv6_txoptions opt_space;
struct sockaddr_in6 * sin6 = (struct sockaddr_in6 *) msg->msg_name;
struct in6_addr *daddr, *final_p = NULL, 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 flowi fl;
int addr_len = msg->msg_namelen;
int hlimit = -1;
int tclass = -1;
u16 proto;
int err;
/* Rough check on arithmetic overflow,
better check is made in ip6_build_xmit
*/
if (len < 0)
return -EMSGSIZE;
/* Mirror BSD error message compatibility */
if (msg->msg_flags & MSG_OOB)
return -EOPNOTSUPP;
/*
* Get and verify the address.
*/
memset(&fl, 0, sizeof(fl));
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->num;
else if (proto != inet->num)
return(-EINVAL);
if (proto > 255)
return(-EINVAL);
daddr = &sin6->sin6_addr;
if (np->sndflow) {
fl.fl6_flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) {
flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
if (flowlabel == NULL)
return -EINVAL;
daddr = &flowlabel->dst;
}
}
/*
* Otherwise it will be difficult to maintain
* sk->sk_dst_cache.
*/
if (sk->sk_state == TCP_ESTABLISHED &&
ipv6_addr_equal(daddr, &np->daddr))
daddr = &np->daddr;
if (addr_len >= sizeof(struct sockaddr_in6) &&
sin6->sin6_scope_id &&
ipv6_addr_type(daddr)&IPV6_ADDR_LINKLOCAL)
fl.oif = sin6->sin6_scope_id;
} else {
if (sk->sk_state != TCP_ESTABLISHED)
return -EDESTADDRREQ;
proto = inet->num;
daddr = &np->daddr;
fl.fl6_flowlabel = np->flow_label;
}
if (ipv6_addr_any(daddr)) {
/*
* unspecified destination address
* treated as error... is this correct ?
*/
fl6_sock_release(flowlabel);
return(-EINVAL);
}
if (fl.oif == 0)
fl.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);
err = datagram_send_ctl(msg, &fl, opt, &hlimit, &tclass);
if (err < 0) {
fl6_sock_release(flowlabel);
return err;
}
if ((fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
if (flowlabel == NULL)
return -EINVAL;
}
if (!(opt->opt_nflen|opt->opt_flen))
opt = NULL;
}
if (opt == NULL)
opt = np->opt;
if (flowlabel)
opt = fl6_merge_options(&opt_space, flowlabel, opt);
opt = ipv6_fixup_options(&opt_space, opt);
fl.proto = proto;
rawv6_probe_proto_opt(&fl, msg);
ipv6_addr_copy(&fl.fl6_dst, daddr);
if (ipv6_addr_any(&fl.fl6_src) && !ipv6_addr_any(&np->saddr))
ipv6_addr_copy(&fl.fl6_src, &np->saddr);
/* merge ip6_build_xmit from ip6_output */
if (opt && opt->srcrt) {
struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt;
ipv6_addr_copy(&final, &fl.fl6_dst);
ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
final_p = &final;
}
if (!fl.oif && ipv6_addr_is_multicast(&fl.fl6_dst))
fl.oif = np->mcast_oif;
security_sk_classify_flow(sk, &fl);
err = ip6_dst_lookup(sk, &dst, &fl);
if (err)
goto out;
if (final_p)
ipv6_addr_copy(&fl.fl6_dst, final_p);
if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0)
goto out;
if (hlimit < 0) {
if (ipv6_addr_is_multicast(&fl.fl6_dst))
hlimit = np->mcast_hops;
else
hlimit = np->hop_limit;
if (hlimit < 0)
hlimit = dst_metric(dst, RTAX_HOPLIMIT);
if (hlimit < 0)
hlimit = ipv6_get_hoplimit(dst->dev);
}
if (tclass < 0) {
tclass = np->tclass;
if (tclass < 0)
tclass = 0;
}
if (msg->msg_flags&MSG_CONFIRM)
goto do_confirm;
back_from_confirm:
if (inet->hdrincl) {
err = rawv6_send_hdrinc(sk, msg->msg_iov, len, &fl, (struct rt6_info*)dst, msg->msg_flags);
} else {
lock_sock(sk);
err = ip6_append_data(sk, ip_generic_getfrag, msg->msg_iov,
len, 0, hlimit, tclass, opt, &fl, (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, &fl, rp);
}
done:
dst_release(dst);
release_sock(sk);
out:
fl6_sock_release(flowlabel);
return err<0?err:len;
do_confirm:
dst_confirm(dst);
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,
char __user *optval, int optlen)
{
switch (optname) {
case ICMPV6_FILTER:
if (optlen > sizeof(struct icmp6_filter))
optlen = sizeof(struct icmp6_filter);
if (copy_from_user(&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,
char __user *optval, int optlen)
{
struct raw6_sock *rp = raw6_sk(sk);
int val;
if (get_user(val, (int __user *)optval))
return -EFAULT;
switch (optname) {
case IPV6_CHECKSUM:
/* 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;
break;
default:
return(-ENOPROTOOPT);
}
}
static int rawv6_setsockopt(struct sock *sk, int level, int optname,
char __user *optval, int optlen)
{
switch(level) {
case SOL_RAW:
break;
case SOL_ICMPV6:
if (inet_sk(sk)->num != IPPROTO_ICMPV6)
return -EOPNOTSUPP;
return rawv6_seticmpfilter(sk, level, optname, optval,
optlen);
case SOL_IPV6:
if (optname == IPV6_CHECKSUM)
break;
default:
return ipv6_setsockopt(sk, level, optname, optval,
optlen);
};
return do_rawv6_setsockopt(sk, level, optname, optval, optlen);
}
#ifdef CONFIG_COMPAT
static int compat_rawv6_setsockopt(struct sock *sk, int level, int optname,
char __user *optval, int optlen)
{
switch (level) {
case SOL_RAW:
break;
case SOL_ICMPV6:
if (inet_sk(sk)->num != IPPROTO_ICMPV6)
return -EOPNOTSUPP;
return rawv6_seticmpfilter(sk, level, optname, optval, optlen);
case SOL_IPV6:
if (optname == IPV6_CHECKSUM)
break;
default:
return compat_ipv6_setsockopt(sk, level, optname,
optval, optlen);
};
return do_rawv6_setsockopt(sk, level, optname, optval, optlen);
}
#endif
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_CHECKSUM:
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)->num != IPPROTO_ICMPV6)
return -EOPNOTSUPP;
return rawv6_geticmpfilter(sk, level, optname, optval,
optlen);
case SOL_IPV6:
if (optname == IPV6_CHECKSUM)
break;
default:
return ipv6_getsockopt(sk, level, optname, optval,
optlen);
};
return do_rawv6_getsockopt(sk, level, optname, optval, optlen);
}
#ifdef CONFIG_COMPAT
static int compat_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)->num != IPPROTO_ICMPV6)
return -EOPNOTSUPP;
return rawv6_geticmpfilter(sk, level, optname, optval, optlen);
case SOL_IPV6:
if (optname == IPV6_CHECKSUM)
break;
default:
return compat_ipv6_getsockopt(sk, level, optname,
optval, optlen);
};
return do_rawv6_getsockopt(sk, level, optname, optval, optlen);
}
#endif
static int rawv6_ioctl(struct sock *sk, int cmd, unsigned long arg)
{
switch(cmd) {
case SIOCOUTQ:
{
int amount = atomic_read(&sk->sk_wmem_alloc);
return put_user(amount, (int __user *)arg);
}
case SIOCINQ:
{
struct sk_buff *skb;
int amount = 0;
spin_lock_bh(&sk->sk_receive_queue.lock);
skb = skb_peek(&sk->sk_receive_queue);
if (skb != NULL)
amount = skb->tail - skb->h.raw;
spin_unlock_bh(&sk->sk_receive_queue.lock);
return put_user(amount, (int __user *)arg);
}
default:
return -ENOIOCTLCMD;
}
}
static void rawv6_close(struct sock *sk, long timeout)
{
if (inet_sk(sk)->num == IPPROTO_RAW)
ip6_ra_control(sk, -1, NULL);
sk_common_release(sk);
}
static int rawv6_init_sk(struct sock *sk)
{
if (inet_sk(sk)->num == IPPROTO_ICMPV6) {
struct raw6_sock *rp = raw6_sk(sk);
rp->checksum = 1;
rp->offset = 2;
}
return(0);
}
struct proto rawv6_prot = {
.name = "RAWv6",
.owner = THIS_MODULE,
.close = rawv6_close,
.connect = ip6_datagram_connect,
.disconnect = udp_disconnect,
.ioctl = rawv6_ioctl,
.init = rawv6_init_sk,
.destroy = inet6_destroy_sock,
.setsockopt = rawv6_setsockopt,
.getsockopt = rawv6_getsockopt,
.sendmsg = rawv6_sendmsg,
.recvmsg = rawv6_recvmsg,
.bind = rawv6_bind,
.backlog_rcv = rawv6_rcv_skb,
.hash = raw_v6_hash,
.unhash = raw_v6_unhash,
.obj_size = sizeof(struct raw6_sock),
#ifdef CONFIG_COMPAT
.compat_setsockopt = compat_rawv6_setsockopt,
.compat_getsockopt = compat_rawv6_getsockopt,
#endif
};
#ifdef CONFIG_PROC_FS
struct raw6_iter_state {
int bucket;
};
#define raw6_seq_private(seq) ((struct raw6_iter_state *)(seq)->private)
static struct sock *raw6_get_first(struct seq_file *seq)
{
struct sock *sk;
struct hlist_node *node;
struct raw6_iter_state* state = raw6_seq_private(seq);
for (state->bucket = 0; state->bucket < RAWV6_HTABLE_SIZE; ++state->bucket)
sk_for_each(sk, node, &raw_v6_htable[state->bucket])
if (sk->sk_family == PF_INET6)
goto out;
sk = NULL;
out:
return sk;
}
static struct sock *raw6_get_next(struct seq_file *seq, struct sock *sk)
{
struct raw6_iter_state* state = raw6_seq_private(seq);
do {
sk = sk_next(sk);
try_again:
;
} while (sk && sk->sk_family != PF_INET6);
if (!sk && ++state->bucket < RAWV6_HTABLE_SIZE) {
sk = sk_head(&raw_v6_htable[state->bucket]);
goto try_again;
}
return sk;
}
static struct sock *raw6_get_idx(struct seq_file *seq, loff_t pos)
{
struct sock *sk = raw6_get_first(seq);
if (sk)
while (pos && (sk = raw6_get_next(seq, sk)) != NULL)
--pos;
return pos ? NULL : sk;
}
static void *raw6_seq_start(struct seq_file *seq, loff_t *pos)
{
read_lock(&raw_v6_lock);
return *pos ? raw6_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
}
static void *raw6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
{
struct sock *sk;
if (v == SEQ_START_TOKEN)
sk = raw6_get_first(seq);
else
sk = raw6_get_next(seq, v);
++*pos;
return sk;
}
static void raw6_seq_stop(struct seq_file *seq, void *v)
{
read_unlock(&raw_v6_lock);
}
static void raw6_sock_seq_show(struct seq_file *seq, struct sock *sp, int i)
{
struct ipv6_pinfo *np = inet6_sk(sp);
struct in6_addr *dest, *src;
__u16 destp, srcp;
dest = &np->daddr;
src = &np->rcv_saddr;
destp = 0;
srcp = inet_sk(sp)->num;
seq_printf(seq,
"%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
"%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p\n",
i,
src->s6_addr32[0], src->s6_addr32[1],
src->s6_addr32[2], src->s6_addr32[3], srcp,
dest->s6_addr32[0], dest->s6_addr32[1],
dest->s6_addr32[2], dest->s6_addr32[3], destp,
sp->sk_state,
atomic_read(&sp->sk_wmem_alloc),
atomic_read(&sp->sk_rmem_alloc),
0, 0L, 0,
sock_i_uid(sp), 0,
sock_i_ino(sp),
atomic_read(&sp->sk_refcnt), sp);
}
static int raw6_seq_show(struct seq_file *seq, void *v)
{
if (v == SEQ_START_TOKEN)
seq_printf(seq,
" sl "
"local_address "
"remote_address "
"st tx_queue rx_queue tr tm->when retrnsmt"
" uid timeout inode\n");
else
raw6_sock_seq_show(seq, v, raw6_seq_private(seq)->bucket);
return 0;
}
static struct seq_operations raw6_seq_ops = {
.start = raw6_seq_start,
.next = raw6_seq_next,
.stop = raw6_seq_stop,
.show = raw6_seq_show,
};
static int raw6_seq_open(struct inode *inode, struct file *file)
{
struct seq_file *seq;
int rc = -ENOMEM;
struct raw6_iter_state *s = kzalloc(sizeof(*s), GFP_KERNEL);
if (!s)
goto out;
rc = seq_open(file, &raw6_seq_ops);
if (rc)
goto out_kfree;
seq = file->private_data;
seq->private = s;
out:
return rc;
out_kfree:
kfree(s);
goto out;
}
static struct file_operations raw6_seq_fops = {
.owner = THIS_MODULE,
.open = raw6_seq_open,
.read = seq_read,
.llseek = seq_lseek,
.release = seq_release_private,
};
int __init raw6_proc_init(void)
{
if (!proc_net_fops_create("raw6", S_IRUGO, &raw6_seq_fops))
return -ENOMEM;
return 0;
}
void raw6_proc_exit(void)
{
proc_net_remove("raw6");
}
#endif /* CONFIG_PROC_FS */
Ссылка в новой задаче Показать git blame Копировать постоянную ссылку