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linux-next/net/sctp/ipv6.c
Linus Torvalds a11e1d432b Revert changes to convert to ->poll_mask() and aio IOCB_CMD_POLL
The poll() changes were not well thought out, and completely
unexplained.  They also caused a huge performance regression, because
"->poll()" was no longer a trivial file operation that just called down
to the underlying file operations, but instead did at least two indirect
calls.

Indirect calls are sadly slow now with the Spectre mitigation, but the
performance problem could at least be largely mitigated by changing the
"->get_poll_head()" operation to just have a per-file-descriptor pointer
to the poll head instead.  That gets rid of one of the new indirections.

But that doesn't fix the new complexity that is completely unwarranted
for the regular case.  The (undocumented) reason for the poll() changes
was some alleged AIO poll race fixing, but we don't make the common case
slower and more complex for some uncommon special case, so this all
really needs way more explanations and most likely a fundamental
redesign.

[ This revert is a revert of about 30 different commits, not reverted
  individually because that would just be unnecessarily messy  - Linus ]

Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Christoph Hellwig <hch@lst.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2018-06-28 10:40:47 -07:00

1158 lines
30 KiB
C

/* SCTP kernel implementation
* (C) Copyright IBM Corp. 2002, 2004
* Copyright (c) 2001 Nokia, Inc.
* Copyright (c) 2001 La Monte H.P. Yarroll
* Copyright (c) 2002-2003 Intel Corp.
*
* This file is part of the SCTP kernel implementation
*
* SCTP over IPv6.
*
* This SCTP implementation 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, or (at your option)
* any later version.
*
* This SCTP implementation is distributed in the hope that it
* will be useful, but WITHOUT ANY WARRANTY; without even the implied
* ************************
* warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
* See the GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GNU CC; see the file COPYING. If not, see
* <http://www.gnu.org/licenses/>.
*
* Please send any bug reports or fixes you make to the
* email address(es):
* lksctp developers <linux-sctp@vger.kernel.org>
*
* Written or modified by:
* Le Yanqun <yanqun.le@nokia.com>
* Hui Huang <hui.huang@nokia.com>
* La Monte H.P. Yarroll <piggy@acm.org>
* Sridhar Samudrala <sri@us.ibm.com>
* Jon Grimm <jgrimm@us.ibm.com>
* Ardelle Fan <ardelle.fan@intel.com>
*
* Based on:
* linux/net/ipv6/tcp_ipv6.c
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/socket.h>
#include <linux/sockios.h>
#include <linux/net.h>
#include <linux/in.h>
#include <linux/in6.h>
#include <linux/netdevice.h>
#include <linux/init.h>
#include <linux/ipsec.h>
#include <linux/slab.h>
#include <linux/ipv6.h>
#include <linux/icmpv6.h>
#include <linux/random.h>
#include <linux/seq_file.h>
#include <net/protocol.h>
#include <net/ndisc.h>
#include <net/ip.h>
#include <net/ipv6.h>
#include <net/transp_v6.h>
#include <net/addrconf.h>
#include <net/ip6_route.h>
#include <net/inet_common.h>
#include <net/inet_ecn.h>
#include <net/sctp/sctp.h>
#include <linux/uaccess.h>
static inline int sctp_v6_addr_match_len(union sctp_addr *s1,
union sctp_addr *s2);
static void sctp_v6_to_addr(union sctp_addr *addr, struct in6_addr *saddr,
__be16 port);
static int sctp_v6_cmp_addr(const union sctp_addr *addr1,
const union sctp_addr *addr2);
/* Event handler for inet6 address addition/deletion events.
* The sctp_local_addr_list needs to be protocted by a spin lock since
* multiple notifiers (say IPv4 and IPv6) may be running at the same
* time and thus corrupt the list.
* The reader side is protected with RCU.
*/
static int sctp_inet6addr_event(struct notifier_block *this, unsigned long ev,
void *ptr)
{
struct inet6_ifaddr *ifa = (struct inet6_ifaddr *)ptr;
struct sctp_sockaddr_entry *addr = NULL;
struct sctp_sockaddr_entry *temp;
struct net *net = dev_net(ifa->idev->dev);
int found = 0;
switch (ev) {
case NETDEV_UP:
addr = kmalloc(sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC);
if (addr) {
addr->a.v6.sin6_family = AF_INET6;
addr->a.v6.sin6_port = 0;
addr->a.v6.sin6_addr = ifa->addr;
addr->a.v6.sin6_scope_id = ifa->idev->dev->ifindex;
addr->valid = 1;
spin_lock_bh(&net->sctp.local_addr_lock);
list_add_tail_rcu(&addr->list, &net->sctp.local_addr_list);
sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_NEW);
spin_unlock_bh(&net->sctp.local_addr_lock);
}
break;
case NETDEV_DOWN:
spin_lock_bh(&net->sctp.local_addr_lock);
list_for_each_entry_safe(addr, temp,
&net->sctp.local_addr_list, list) {
if (addr->a.sa.sa_family == AF_INET6 &&
ipv6_addr_equal(&addr->a.v6.sin6_addr,
&ifa->addr)) {
sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_DEL);
found = 1;
addr->valid = 0;
list_del_rcu(&addr->list);
break;
}
}
spin_unlock_bh(&net->sctp.local_addr_lock);
if (found)
kfree_rcu(addr, rcu);
break;
}
return NOTIFY_DONE;
}
static struct notifier_block sctp_inet6addr_notifier = {
.notifier_call = sctp_inet6addr_event,
};
/* ICMP error handler. */
static void sctp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
u8 type, u8 code, int offset, __be32 info)
{
struct inet6_dev *idev;
struct sock *sk;
struct sctp_association *asoc;
struct sctp_transport *transport;
struct ipv6_pinfo *np;
__u16 saveip, savesctp;
int err;
struct net *net = dev_net(skb->dev);
idev = in6_dev_get(skb->dev);
/* Fix up skb to look at the embedded net header. */
saveip = skb->network_header;
savesctp = skb->transport_header;
skb_reset_network_header(skb);
skb_set_transport_header(skb, offset);
sk = sctp_err_lookup(net, AF_INET6, skb, sctp_hdr(skb), &asoc, &transport);
/* Put back, the original pointers. */
skb->network_header = saveip;
skb->transport_header = savesctp;
if (!sk) {
__ICMP6_INC_STATS(net, idev, ICMP6_MIB_INERRORS);
goto out;
}
/* Warning: The sock lock is held. Remember to call
* sctp_err_finish!
*/
switch (type) {
case ICMPV6_PKT_TOOBIG:
if (ip6_sk_accept_pmtu(sk))
sctp_icmp_frag_needed(sk, asoc, transport, ntohl(info));
goto out_unlock;
case ICMPV6_PARAMPROB:
if (ICMPV6_UNK_NEXTHDR == code) {
sctp_icmp_proto_unreachable(sk, asoc, transport);
goto out_unlock;
}
break;
case NDISC_REDIRECT:
sctp_icmp_redirect(sk, transport, skb);
goto out_unlock;
default:
break;
}
np = inet6_sk(sk);
icmpv6_err_convert(type, code, &err);
if (!sock_owned_by_user(sk) && np->recverr) {
sk->sk_err = err;
sk->sk_error_report(sk);
} else { /* Only an error on timeout */
sk->sk_err_soft = err;
}
out_unlock:
sctp_err_finish(sk, transport);
out:
if (likely(idev != NULL))
in6_dev_put(idev);
}
static int sctp_v6_xmit(struct sk_buff *skb, struct sctp_transport *transport)
{
struct sock *sk = skb->sk;
struct ipv6_pinfo *np = inet6_sk(sk);
struct flowi6 *fl6 = &transport->fl.u.ip6;
int res;
pr_debug("%s: skb:%p, len:%d, src:%pI6 dst:%pI6\n", __func__, skb,
skb->len, &fl6->saddr, &fl6->daddr);
IP6_ECN_flow_xmit(sk, fl6->flowlabel);
if (!(transport->param_flags & SPP_PMTUD_ENABLE))
skb->ignore_df = 1;
SCTP_INC_STATS(sock_net(sk), SCTP_MIB_OUTSCTPPACKS);
rcu_read_lock();
res = ip6_xmit(sk, skb, fl6, sk->sk_mark, rcu_dereference(np->opt),
np->tclass);
rcu_read_unlock();
return res;
}
/* Returns the dst cache entry for the given source and destination ip
* addresses.
*/
static void sctp_v6_get_dst(struct sctp_transport *t, union sctp_addr *saddr,
struct flowi *fl, struct sock *sk)
{
struct sctp_association *asoc = t->asoc;
struct dst_entry *dst = NULL;
struct flowi6 *fl6 = &fl->u.ip6;
struct sctp_bind_addr *bp;
struct ipv6_pinfo *np = inet6_sk(sk);
struct sctp_sockaddr_entry *laddr;
union sctp_addr *daddr = &t->ipaddr;
union sctp_addr dst_saddr;
struct in6_addr *final_p, final;
enum sctp_scope scope;
__u8 matchlen = 0;
memset(fl6, 0, sizeof(struct flowi6));
fl6->daddr = daddr->v6.sin6_addr;
fl6->fl6_dport = daddr->v6.sin6_port;
fl6->flowi6_proto = IPPROTO_SCTP;
if (ipv6_addr_type(&daddr->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL)
fl6->flowi6_oif = daddr->v6.sin6_scope_id;
else if (asoc)
fl6->flowi6_oif = asoc->base.sk->sk_bound_dev_if;
pr_debug("%s: dst=%pI6 ", __func__, &fl6->daddr);
if (asoc)
fl6->fl6_sport = htons(asoc->base.bind_addr.port);
if (saddr) {
fl6->saddr = saddr->v6.sin6_addr;
fl6->fl6_sport = saddr->v6.sin6_port;
pr_debug("src=%pI6 - ", &fl6->saddr);
}
rcu_read_lock();
final_p = fl6_update_dst(fl6, rcu_dereference(np->opt), &final);
rcu_read_unlock();
dst = ip6_dst_lookup_flow(sk, fl6, final_p);
if (!asoc || saddr)
goto out;
bp = &asoc->base.bind_addr;
scope = sctp_scope(daddr);
/* ip6_dst_lookup has filled in the fl6->saddr for us. Check
* to see if we can use it.
*/
if (!IS_ERR(dst)) {
/* Walk through the bind address list and look for a bind
* address that matches the source address of the returned dst.
*/
sctp_v6_to_addr(&dst_saddr, &fl6->saddr, htons(bp->port));
rcu_read_lock();
list_for_each_entry_rcu(laddr, &bp->address_list, list) {
if (!laddr->valid || laddr->state == SCTP_ADDR_DEL ||
(laddr->state != SCTP_ADDR_SRC &&
!asoc->src_out_of_asoc_ok))
continue;
/* Do not compare against v4 addrs */
if ((laddr->a.sa.sa_family == AF_INET6) &&
(sctp_v6_cmp_addr(&dst_saddr, &laddr->a))) {
rcu_read_unlock();
goto out;
}
}
rcu_read_unlock();
/* None of the bound addresses match the source address of the
* dst. So release it.
*/
dst_release(dst);
dst = NULL;
}
/* Walk through the bind address list and try to get the
* best source address for a given destination.
*/
rcu_read_lock();
list_for_each_entry_rcu(laddr, &bp->address_list, list) {
struct dst_entry *bdst;
__u8 bmatchlen;
if (!laddr->valid ||
laddr->state != SCTP_ADDR_SRC ||
laddr->a.sa.sa_family != AF_INET6 ||
scope > sctp_scope(&laddr->a))
continue;
fl6->saddr = laddr->a.v6.sin6_addr;
fl6->fl6_sport = laddr->a.v6.sin6_port;
final_p = fl6_update_dst(fl6, rcu_dereference(np->opt), &final);
bdst = ip6_dst_lookup_flow(sk, fl6, final_p);
if (IS_ERR(bdst))
continue;
if (ipv6_chk_addr(dev_net(bdst->dev),
&laddr->a.v6.sin6_addr, bdst->dev, 1)) {
if (!IS_ERR_OR_NULL(dst))
dst_release(dst);
dst = bdst;
break;
}
bmatchlen = sctp_v6_addr_match_len(daddr, &laddr->a);
if (matchlen > bmatchlen) {
dst_release(bdst);
continue;
}
if (!IS_ERR_OR_NULL(dst))
dst_release(dst);
dst = bdst;
matchlen = bmatchlen;
}
rcu_read_unlock();
out:
if (!IS_ERR_OR_NULL(dst)) {
struct rt6_info *rt;
rt = (struct rt6_info *)dst;
t->dst = dst;
t->dst_cookie = rt6_get_cookie(rt);
pr_debug("rt6_dst:%pI6/%d rt6_src:%pI6\n",
&rt->rt6i_dst.addr, rt->rt6i_dst.plen,
&fl6->saddr);
} else {
t->dst = NULL;
pr_debug("no route\n");
}
}
/* Returns the number of consecutive initial bits that match in the 2 ipv6
* addresses.
*/
static inline int sctp_v6_addr_match_len(union sctp_addr *s1,
union sctp_addr *s2)
{
return ipv6_addr_diff(&s1->v6.sin6_addr, &s2->v6.sin6_addr);
}
/* Fills in the source address(saddr) based on the destination address(daddr)
* and asoc's bind address list.
*/
static void sctp_v6_get_saddr(struct sctp_sock *sk,
struct sctp_transport *t,
struct flowi *fl)
{
struct flowi6 *fl6 = &fl->u.ip6;
union sctp_addr *saddr = &t->saddr;
pr_debug("%s: asoc:%p dst:%p\n", __func__, t->asoc, t->dst);
if (t->dst) {
saddr->v6.sin6_family = AF_INET6;
saddr->v6.sin6_addr = fl6->saddr;
}
}
/* Make a copy of all potential local addresses. */
static void sctp_v6_copy_addrlist(struct list_head *addrlist,
struct net_device *dev)
{
struct inet6_dev *in6_dev;
struct inet6_ifaddr *ifp;
struct sctp_sockaddr_entry *addr;
rcu_read_lock();
if ((in6_dev = __in6_dev_get(dev)) == NULL) {
rcu_read_unlock();
return;
}
read_lock_bh(&in6_dev->lock);
list_for_each_entry(ifp, &in6_dev->addr_list, if_list) {
/* Add the address to the local list. */
addr = kzalloc(sizeof(*addr), GFP_ATOMIC);
if (addr) {
addr->a.v6.sin6_family = AF_INET6;
addr->a.v6.sin6_port = 0;
addr->a.v6.sin6_addr = ifp->addr;
addr->a.v6.sin6_scope_id = dev->ifindex;
addr->valid = 1;
INIT_LIST_HEAD(&addr->list);
list_add_tail(&addr->list, addrlist);
}
}
read_unlock_bh(&in6_dev->lock);
rcu_read_unlock();
}
/* Copy over any ip options */
static void sctp_v6_copy_ip_options(struct sock *sk, struct sock *newsk)
{
struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
struct ipv6_txoptions *opt;
newnp = inet6_sk(newsk);
rcu_read_lock();
opt = rcu_dereference(np->opt);
if (opt) {
opt = ipv6_dup_options(newsk, opt);
if (!opt)
pr_err("%s: Failed to copy ip options\n", __func__);
}
RCU_INIT_POINTER(newnp->opt, opt);
rcu_read_unlock();
}
/* Account for the IP options */
static int sctp_v6_ip_options_len(struct sock *sk)
{
struct ipv6_pinfo *np = inet6_sk(sk);
struct ipv6_txoptions *opt;
int len = 0;
rcu_read_lock();
opt = rcu_dereference(np->opt);
if (opt)
len = opt->opt_flen + opt->opt_nflen;
rcu_read_unlock();
return len;
}
/* Initialize a sockaddr_storage from in incoming skb. */
static void sctp_v6_from_skb(union sctp_addr *addr, struct sk_buff *skb,
int is_saddr)
{
/* Always called on head skb, so this is safe */
struct sctphdr *sh = sctp_hdr(skb);
struct sockaddr_in6 *sa = &addr->v6;
addr->v6.sin6_family = AF_INET6;
addr->v6.sin6_flowinfo = 0; /* FIXME */
addr->v6.sin6_scope_id = ((struct inet6_skb_parm *)skb->cb)->iif;
if (is_saddr) {
sa->sin6_port = sh->source;
sa->sin6_addr = ipv6_hdr(skb)->saddr;
} else {
sa->sin6_port = sh->dest;
sa->sin6_addr = ipv6_hdr(skb)->daddr;
}
}
/* Initialize an sctp_addr from a socket. */
static void sctp_v6_from_sk(union sctp_addr *addr, struct sock *sk)
{
addr->v6.sin6_family = AF_INET6;
addr->v6.sin6_port = 0;
addr->v6.sin6_addr = sk->sk_v6_rcv_saddr;
}
/* Initialize sk->sk_rcv_saddr from sctp_addr. */
static void sctp_v6_to_sk_saddr(union sctp_addr *addr, struct sock *sk)
{
if (addr->sa.sa_family == AF_INET) {
sk->sk_v6_rcv_saddr.s6_addr32[0] = 0;
sk->sk_v6_rcv_saddr.s6_addr32[1] = 0;
sk->sk_v6_rcv_saddr.s6_addr32[2] = htonl(0x0000ffff);
sk->sk_v6_rcv_saddr.s6_addr32[3] =
addr->v4.sin_addr.s_addr;
} else {
sk->sk_v6_rcv_saddr = addr->v6.sin6_addr;
}
}
/* Initialize sk->sk_daddr from sctp_addr. */
static void sctp_v6_to_sk_daddr(union sctp_addr *addr, struct sock *sk)
{
if (addr->sa.sa_family == AF_INET) {
sk->sk_v6_daddr.s6_addr32[0] = 0;
sk->sk_v6_daddr.s6_addr32[1] = 0;
sk->sk_v6_daddr.s6_addr32[2] = htonl(0x0000ffff);
sk->sk_v6_daddr.s6_addr32[3] = addr->v4.sin_addr.s_addr;
} else {
sk->sk_v6_daddr = addr->v6.sin6_addr;
}
}
/* Initialize a sctp_addr from an address parameter. */
static void sctp_v6_from_addr_param(union sctp_addr *addr,
union sctp_addr_param *param,
__be16 port, int iif)
{
addr->v6.sin6_family = AF_INET6;
addr->v6.sin6_port = port;
addr->v6.sin6_flowinfo = 0; /* BUG */
addr->v6.sin6_addr = param->v6.addr;
addr->v6.sin6_scope_id = iif;
}
/* Initialize an address parameter from a sctp_addr and return the length
* of the address parameter.
*/
static int sctp_v6_to_addr_param(const union sctp_addr *addr,
union sctp_addr_param *param)
{
int length = sizeof(struct sctp_ipv6addr_param);
param->v6.param_hdr.type = SCTP_PARAM_IPV6_ADDRESS;
param->v6.param_hdr.length = htons(length);
param->v6.addr = addr->v6.sin6_addr;
return length;
}
/* Initialize a sctp_addr from struct in6_addr. */
static void sctp_v6_to_addr(union sctp_addr *addr, struct in6_addr *saddr,
__be16 port)
{
addr->sa.sa_family = AF_INET6;
addr->v6.sin6_port = port;
addr->v6.sin6_flowinfo = 0;
addr->v6.sin6_addr = *saddr;
addr->v6.sin6_scope_id = 0;
}
static int __sctp_v6_cmp_addr(const union sctp_addr *addr1,
const union sctp_addr *addr2)
{
if (addr1->sa.sa_family != addr2->sa.sa_family) {
if (addr1->sa.sa_family == AF_INET &&
addr2->sa.sa_family == AF_INET6 &&
ipv6_addr_v4mapped(&addr2->v6.sin6_addr) &&
addr2->v6.sin6_addr.s6_addr32[3] ==
addr1->v4.sin_addr.s_addr)
return 1;
if (addr2->sa.sa_family == AF_INET &&
addr1->sa.sa_family == AF_INET6 &&
ipv6_addr_v4mapped(&addr1->v6.sin6_addr) &&
addr1->v6.sin6_addr.s6_addr32[3] ==
addr2->v4.sin_addr.s_addr)
return 1;
return 0;
}
if (!ipv6_addr_equal(&addr1->v6.sin6_addr, &addr2->v6.sin6_addr))
return 0;
/* If this is a linklocal address, compare the scope_id. */
if ((ipv6_addr_type(&addr1->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL) &&
addr1->v6.sin6_scope_id && addr2->v6.sin6_scope_id &&
addr1->v6.sin6_scope_id != addr2->v6.sin6_scope_id)
return 0;
return 1;
}
/* Compare addresses exactly.
* v4-mapped-v6 is also in consideration.
*/
static int sctp_v6_cmp_addr(const union sctp_addr *addr1,
const union sctp_addr *addr2)
{
return __sctp_v6_cmp_addr(addr1, addr2) &&
addr1->v6.sin6_port == addr2->v6.sin6_port;
}
/* Initialize addr struct to INADDR_ANY. */
static void sctp_v6_inaddr_any(union sctp_addr *addr, __be16 port)
{
memset(addr, 0x00, sizeof(union sctp_addr));
addr->v6.sin6_family = AF_INET6;
addr->v6.sin6_port = port;
}
/* Is this a wildcard address? */
static int sctp_v6_is_any(const union sctp_addr *addr)
{
return ipv6_addr_any(&addr->v6.sin6_addr);
}
/* Should this be available for binding? */
static int sctp_v6_available(union sctp_addr *addr, struct sctp_sock *sp)
{
int type;
struct net *net = sock_net(&sp->inet.sk);
const struct in6_addr *in6 = (const struct in6_addr *)&addr->v6.sin6_addr;
type = ipv6_addr_type(in6);
if (IPV6_ADDR_ANY == type)
return 1;
if (type == IPV6_ADDR_MAPPED) {
if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
return 0;
sctp_v6_map_v4(addr);
return sctp_get_af_specific(AF_INET)->available(addr, sp);
}
if (!(type & IPV6_ADDR_UNICAST))
return 0;
return sp->inet.freebind || net->ipv6.sysctl.ip_nonlocal_bind ||
ipv6_chk_addr(net, in6, NULL, 0);
}
/* This function checks if the address is a valid address to be used for
* SCTP.
*
* Output:
* Return 0 - If the address is a non-unicast or an illegal address.
* Return 1 - If the address is a unicast.
*/
static int sctp_v6_addr_valid(union sctp_addr *addr,
struct sctp_sock *sp,
const struct sk_buff *skb)
{
int ret = ipv6_addr_type(&addr->v6.sin6_addr);
/* Support v4-mapped-v6 address. */
if (ret == IPV6_ADDR_MAPPED) {
/* Note: This routine is used in input, so v4-mapped-v6
* are disallowed here when there is no sctp_sock.
*/
if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
return 0;
sctp_v6_map_v4(addr);
return sctp_get_af_specific(AF_INET)->addr_valid(addr, sp, skb);
}
/* Is this a non-unicast address */
if (!(ret & IPV6_ADDR_UNICAST))
return 0;
return 1;
}
/* What is the scope of 'addr'? */
static enum sctp_scope sctp_v6_scope(union sctp_addr *addr)
{
enum sctp_scope retval;
int v6scope;
/* The IPv6 scope is really a set of bit fields.
* See IFA_* in <net/if_inet6.h>. Map to a generic SCTP scope.
*/
v6scope = ipv6_addr_scope(&addr->v6.sin6_addr);
switch (v6scope) {
case IFA_HOST:
retval = SCTP_SCOPE_LOOPBACK;
break;
case IFA_LINK:
retval = SCTP_SCOPE_LINK;
break;
case IFA_SITE:
retval = SCTP_SCOPE_PRIVATE;
break;
default:
retval = SCTP_SCOPE_GLOBAL;
break;
}
return retval;
}
/* Create and initialize a new sk for the socket to be returned by accept(). */
static struct sock *sctp_v6_create_accept_sk(struct sock *sk,
struct sctp_association *asoc,
bool kern)
{
struct sock *newsk;
struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
struct sctp6_sock *newsctp6sk;
newsk = sk_alloc(sock_net(sk), PF_INET6, GFP_KERNEL, sk->sk_prot, kern);
if (!newsk)
goto out;
sock_init_data(NULL, newsk);
sctp_copy_sock(newsk, sk, asoc);
sock_reset_flag(sk, SOCK_ZAPPED);
newsctp6sk = (struct sctp6_sock *)newsk;
inet_sk(newsk)->pinet6 = &newsctp6sk->inet6;
sctp_sk(newsk)->v4mapped = sctp_sk(sk)->v4mapped;
newnp = inet6_sk(newsk);
memcpy(newnp, np, sizeof(struct ipv6_pinfo));
newnp->ipv6_mc_list = NULL;
newnp->ipv6_ac_list = NULL;
newnp->ipv6_fl_list = NULL;
sctp_v6_copy_ip_options(sk, newsk);
/* Initialize sk's sport, dport, rcv_saddr and daddr for getsockname()
* and getpeername().
*/
sctp_v6_to_sk_daddr(&asoc->peer.primary_addr, newsk);
newsk->sk_v6_rcv_saddr = sk->sk_v6_rcv_saddr;
sk_refcnt_debug_inc(newsk);
if (newsk->sk_prot->init(newsk)) {
sk_common_release(newsk);
newsk = NULL;
}
out:
return newsk;
}
/* Format a sockaddr for return to user space. This makes sure the return is
* AF_INET or AF_INET6 depending on the SCTP_I_WANT_MAPPED_V4_ADDR option.
*/
static int sctp_v6_addr_to_user(struct sctp_sock *sp, union sctp_addr *addr)
{
if (sp->v4mapped) {
if (addr->sa.sa_family == AF_INET)
sctp_v4_map_v6(addr);
} else {
if (addr->sa.sa_family == AF_INET6 &&
ipv6_addr_v4mapped(&addr->v6.sin6_addr))
sctp_v6_map_v4(addr);
}
if (addr->sa.sa_family == AF_INET) {
memset(addr->v4.sin_zero, 0, sizeof(addr->v4.sin_zero));
return sizeof(struct sockaddr_in);
}
return sizeof(struct sockaddr_in6);
}
/* Where did this skb come from? */
static int sctp_v6_skb_iif(const struct sk_buff *skb)
{
return IP6CB(skb)->iif;
}
/* Was this packet marked by Explicit Congestion Notification? */
static int sctp_v6_is_ce(const struct sk_buff *skb)
{
return *((__u32 *)(ipv6_hdr(skb))) & (__force __u32)htonl(1 << 20);
}
/* Dump the v6 addr to the seq file. */
static void sctp_v6_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr)
{
seq_printf(seq, "%pI6 ", &addr->v6.sin6_addr);
}
static void sctp_v6_ecn_capable(struct sock *sk)
{
inet6_sk(sk)->tclass |= INET_ECN_ECT_0;
}
/* Initialize a PF_INET msgname from a ulpevent. */
static void sctp_inet6_event_msgname(struct sctp_ulpevent *event,
char *msgname, int *addrlen)
{
union sctp_addr *addr;
struct sctp_association *asoc;
union sctp_addr *paddr;
if (!msgname)
return;
addr = (union sctp_addr *)msgname;
asoc = event->asoc;
paddr = &asoc->peer.primary_addr;
if (paddr->sa.sa_family == AF_INET) {
addr->v4.sin_family = AF_INET;
addr->v4.sin_port = htons(asoc->peer.port);
addr->v4.sin_addr = paddr->v4.sin_addr;
} else {
addr->v6.sin6_family = AF_INET6;
addr->v6.sin6_flowinfo = 0;
if (ipv6_addr_type(&paddr->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL)
addr->v6.sin6_scope_id = paddr->v6.sin6_scope_id;
else
addr->v6.sin6_scope_id = 0;
addr->v6.sin6_port = htons(asoc->peer.port);
addr->v6.sin6_addr = paddr->v6.sin6_addr;
}
*addrlen = sctp_v6_addr_to_user(sctp_sk(asoc->base.sk), addr);
}
/* Initialize a msg_name from an inbound skb. */
static void sctp_inet6_skb_msgname(struct sk_buff *skb, char *msgname,
int *addr_len)
{
union sctp_addr *addr;
struct sctphdr *sh;
if (!msgname)
return;
addr = (union sctp_addr *)msgname;
sh = sctp_hdr(skb);
if (ip_hdr(skb)->version == 4) {
addr->v4.sin_family = AF_INET;
addr->v4.sin_port = sh->source;
addr->v4.sin_addr.s_addr = ip_hdr(skb)->saddr;
} else {
addr->v6.sin6_family = AF_INET6;
addr->v6.sin6_flowinfo = 0;
addr->v6.sin6_port = sh->source;
addr->v6.sin6_addr = ipv6_hdr(skb)->saddr;
if (ipv6_addr_type(&addr->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL)
addr->v6.sin6_scope_id = sctp_v6_skb_iif(skb);
else
addr->v6.sin6_scope_id = 0;
}
*addr_len = sctp_v6_addr_to_user(sctp_sk(skb->sk), addr);
}
/* Do we support this AF? */
static int sctp_inet6_af_supported(sa_family_t family, struct sctp_sock *sp)
{
switch (family) {
case AF_INET6:
return 1;
/* v4-mapped-v6 addresses */
case AF_INET:
if (!__ipv6_only_sock(sctp_opt2sk(sp)))
return 1;
/* fallthru */
default:
return 0;
}
}
/* Address matching with wildcards allowed. This extra level
* of indirection lets us choose whether a PF_INET6 should
* disallow any v4 addresses if we so choose.
*/
static int sctp_inet6_cmp_addr(const union sctp_addr *addr1,
const union sctp_addr *addr2,
struct sctp_sock *opt)
{
struct sock *sk = sctp_opt2sk(opt);
struct sctp_af *af1, *af2;
af1 = sctp_get_af_specific(addr1->sa.sa_family);
af2 = sctp_get_af_specific(addr2->sa.sa_family);
if (!af1 || !af2)
return 0;
/* If the socket is IPv6 only, v4 addrs will not match */
if (__ipv6_only_sock(sk) && af1 != af2)
return 0;
/* Today, wildcard AF_INET/AF_INET6. */
if (sctp_is_any(sk, addr1) || sctp_is_any(sk, addr2))
return 1;
if (addr1->sa.sa_family == AF_INET && addr2->sa.sa_family == AF_INET)
return addr1->v4.sin_addr.s_addr == addr2->v4.sin_addr.s_addr;
return __sctp_v6_cmp_addr(addr1, addr2);
}
/* Verify that the provided sockaddr looks bindable. Common verification,
* has already been taken care of.
*/
static int sctp_inet6_bind_verify(struct sctp_sock *opt, union sctp_addr *addr)
{
struct sctp_af *af;
/* ASSERT: address family has already been verified. */
if (addr->sa.sa_family != AF_INET6)
af = sctp_get_af_specific(addr->sa.sa_family);
else {
int type = ipv6_addr_type(&addr->v6.sin6_addr);
struct net_device *dev;
if (type & IPV6_ADDR_LINKLOCAL) {
struct net *net;
if (!addr->v6.sin6_scope_id)
return 0;
net = sock_net(&opt->inet.sk);
rcu_read_lock();
dev = dev_get_by_index_rcu(net, addr->v6.sin6_scope_id);
if (!dev || !(opt->inet.freebind ||
net->ipv6.sysctl.ip_nonlocal_bind ||
ipv6_chk_addr(net, &addr->v6.sin6_addr,
dev, 0))) {
rcu_read_unlock();
return 0;
}
rcu_read_unlock();
}
af = opt->pf->af;
}
return af->available(addr, opt);
}
/* Verify that the provided sockaddr looks sendable. Common verification,
* has already been taken care of.
*/
static int sctp_inet6_send_verify(struct sctp_sock *opt, union sctp_addr *addr)
{
struct sctp_af *af = NULL;
/* ASSERT: address family has already been verified. */
if (addr->sa.sa_family != AF_INET6)
af = sctp_get_af_specific(addr->sa.sa_family);
else {
int type = ipv6_addr_type(&addr->v6.sin6_addr);
struct net_device *dev;
if (type & IPV6_ADDR_LINKLOCAL) {
if (!addr->v6.sin6_scope_id)
return 0;
rcu_read_lock();
dev = dev_get_by_index_rcu(sock_net(&opt->inet.sk),
addr->v6.sin6_scope_id);
rcu_read_unlock();
if (!dev)
return 0;
}
af = opt->pf->af;
}
return af != NULL;
}
/* Fill in Supported Address Type information for INIT and INIT-ACK
* chunks. Note: In the future, we may want to look at sock options
* to determine whether a PF_INET6 socket really wants to have IPV4
* addresses.
* Returns number of addresses supported.
*/
static int sctp_inet6_supported_addrs(const struct sctp_sock *opt,
__be16 *types)
{
types[0] = SCTP_PARAM_IPV6_ADDRESS;
if (!opt || !ipv6_only_sock(sctp_opt2sk(opt))) {
types[1] = SCTP_PARAM_IPV4_ADDRESS;
return 2;
}
return 1;
}
/* Handle SCTP_I_WANT_MAPPED_V4_ADDR for getpeername() and getsockname() */
static int sctp_getname(struct socket *sock, struct sockaddr *uaddr,
int peer)
{
int rc;
rc = inet6_getname(sock, uaddr, peer);
if (rc < 0)
return rc;
rc = sctp_v6_addr_to_user(sctp_sk(sock->sk),
(union sctp_addr *)uaddr);
return rc;
}
static const struct proto_ops inet6_seqpacket_ops = {
.family = PF_INET6,
.owner = THIS_MODULE,
.release = inet6_release,
.bind = inet6_bind,
.connect = sctp_inet_connect,
.socketpair = sock_no_socketpair,
.accept = inet_accept,
.getname = sctp_getname,
.poll = sctp_poll,
.ioctl = inet6_ioctl,
.listen = sctp_inet_listen,
.shutdown = inet_shutdown,
.setsockopt = sock_common_setsockopt,
.getsockopt = sock_common_getsockopt,
.sendmsg = inet_sendmsg,
.recvmsg = inet_recvmsg,
.mmap = sock_no_mmap,
#ifdef CONFIG_COMPAT
.compat_setsockopt = compat_sock_common_setsockopt,
.compat_getsockopt = compat_sock_common_getsockopt,
#endif
};
static struct inet_protosw sctpv6_seqpacket_protosw = {
.type = SOCK_SEQPACKET,
.protocol = IPPROTO_SCTP,
.prot = &sctpv6_prot,
.ops = &inet6_seqpacket_ops,
.flags = SCTP_PROTOSW_FLAG
};
static struct inet_protosw sctpv6_stream_protosw = {
.type = SOCK_STREAM,
.protocol = IPPROTO_SCTP,
.prot = &sctpv6_prot,
.ops = &inet6_seqpacket_ops,
.flags = SCTP_PROTOSW_FLAG,
};
static int sctp6_rcv(struct sk_buff *skb)
{
return sctp_rcv(skb) ? -1 : 0;
}
static const struct inet6_protocol sctpv6_protocol = {
.handler = sctp6_rcv,
.err_handler = sctp_v6_err,
.flags = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL,
};
static struct sctp_af sctp_af_inet6 = {
.sa_family = AF_INET6,
.sctp_xmit = sctp_v6_xmit,
.setsockopt = ipv6_setsockopt,
.getsockopt = ipv6_getsockopt,
.get_dst = sctp_v6_get_dst,
.get_saddr = sctp_v6_get_saddr,
.copy_addrlist = sctp_v6_copy_addrlist,
.from_skb = sctp_v6_from_skb,
.from_sk = sctp_v6_from_sk,
.from_addr_param = sctp_v6_from_addr_param,
.to_addr_param = sctp_v6_to_addr_param,
.cmp_addr = sctp_v6_cmp_addr,
.scope = sctp_v6_scope,
.addr_valid = sctp_v6_addr_valid,
.inaddr_any = sctp_v6_inaddr_any,
.is_any = sctp_v6_is_any,
.available = sctp_v6_available,
.skb_iif = sctp_v6_skb_iif,
.is_ce = sctp_v6_is_ce,
.seq_dump_addr = sctp_v6_seq_dump_addr,
.ecn_capable = sctp_v6_ecn_capable,
.net_header_len = sizeof(struct ipv6hdr),
.sockaddr_len = sizeof(struct sockaddr_in6),
.ip_options_len = sctp_v6_ip_options_len,
#ifdef CONFIG_COMPAT
.compat_setsockopt = compat_ipv6_setsockopt,
.compat_getsockopt = compat_ipv6_getsockopt,
#endif
};
static struct sctp_pf sctp_pf_inet6 = {
.event_msgname = sctp_inet6_event_msgname,
.skb_msgname = sctp_inet6_skb_msgname,
.af_supported = sctp_inet6_af_supported,
.cmp_addr = sctp_inet6_cmp_addr,
.bind_verify = sctp_inet6_bind_verify,
.send_verify = sctp_inet6_send_verify,
.supported_addrs = sctp_inet6_supported_addrs,
.create_accept_sk = sctp_v6_create_accept_sk,
.addr_to_user = sctp_v6_addr_to_user,
.to_sk_saddr = sctp_v6_to_sk_saddr,
.to_sk_daddr = sctp_v6_to_sk_daddr,
.copy_ip_options = sctp_v6_copy_ip_options,
.af = &sctp_af_inet6,
};
/* Initialize IPv6 support and register with socket layer. */
void sctp_v6_pf_init(void)
{
/* Register the SCTP specific PF_INET6 functions. */
sctp_register_pf(&sctp_pf_inet6, PF_INET6);
/* Register the SCTP specific AF_INET6 functions. */
sctp_register_af(&sctp_af_inet6);
}
void sctp_v6_pf_exit(void)
{
list_del(&sctp_af_inet6.list);
}
/* Initialize IPv6 support and register with socket layer. */
int sctp_v6_protosw_init(void)
{
int rc;
rc = proto_register(&sctpv6_prot, 1);
if (rc)
return rc;
/* Add SCTPv6(UDP and TCP style) to inetsw6 linked list. */
inet6_register_protosw(&sctpv6_seqpacket_protosw);
inet6_register_protosw(&sctpv6_stream_protosw);
return 0;
}
void sctp_v6_protosw_exit(void)
{
inet6_unregister_protosw(&sctpv6_seqpacket_protosw);
inet6_unregister_protosw(&sctpv6_stream_protosw);
proto_unregister(&sctpv6_prot);
}
/* Register with inet6 layer. */
int sctp_v6_add_protocol(void)
{
/* Register notifier for inet6 address additions/deletions. */
register_inet6addr_notifier(&sctp_inet6addr_notifier);
if (inet6_add_protocol(&sctpv6_protocol, IPPROTO_SCTP) < 0)
return -EAGAIN;
return 0;
}
/* Unregister with inet6 layer. */
void sctp_v6_del_protocol(void)
{
inet6_del_protocol(&sctpv6_protocol, IPPROTO_SCTP);
unregister_inet6addr_notifier(&sctp_inet6addr_notifier);
}