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linux/net/sctp/ipv6.c

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/* SCTP kernel reference 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 reference Implementation
*
* SCTP over IPv6.
*
* The SCTP reference 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.
*
* The SCTP reference 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, write to
* the Free Software Foundation, 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*
* Please send any bug reports or fixes you make to the
* email address(es):
* lksctp developers <lksctp-developers@lists.sourceforge.net>
*
* Or submit a bug report through the following website:
* http://www.sf.net/projects/lksctp
*
* 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
*
* Any bugs reported given to us we will try to fix... any fixes shared will
* be incorporated into the next SCTP release.
*/
#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/sched.h>
#include <linux/in.h>
#include <linux/in6.h>
#include <linux/netdevice.h>
#include <linux/init.h>
#include <linux/ipsec.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 <asm/uaccess.h>
static struct notifier_block sctp_inet6addr_notifier = {
.notifier_call = sctp_inetaddr_event,
};
/* ICMP error handler. */
SCTP_STATIC void sctp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
int type, int code, int offset, __u32 info)
{
struct inet6_dev *idev;
struct ipv6hdr *iph = (struct ipv6hdr *)skb->data;
struct sctphdr *sh = (struct sctphdr *)(skb->data + offset);
struct sock *sk;
struct sctp_association *asoc;
struct sctp_transport *transport;
struct ipv6_pinfo *np;
char *saveip, *savesctp;
int err;
idev = in6_dev_get(skb->dev);
/* Fix up skb to look at the embedded net header. */
saveip = skb->nh.raw;
savesctp = skb->h.raw;
skb->nh.ipv6h = iph;
skb->h.raw = (char *)sh;
sk = sctp_err_lookup(AF_INET6, skb, sh, &asoc, &transport);
/* Put back, the original pointers. */
skb->nh.raw = saveip;
skb->h.raw = savesctp;
if (!sk) {
ICMP6_INC_STATS_BH(idev, ICMP6_MIB_INERRORS);
goto out;
}
/* Warning: The sock lock is held. Remember to call
* sctp_err_finish!
*/
switch (type) {
case ICMPV6_PKT_TOOBIG:
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;
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, asoc);
out:
if (likely(idev != NULL))
in6_dev_put(idev);
}
/* Based on tcp_v6_xmit() in tcp_ipv6.c. */
static int sctp_v6_xmit(struct sk_buff *skb, struct sctp_transport *transport,
int ipfragok)
{
struct sock *sk = skb->sk;
struct ipv6_pinfo *np = inet6_sk(sk);
struct flowi fl;
memset(&fl, 0, sizeof(fl));
fl.proto = sk->sk_protocol;
/* Fill in the dest address from the route entry passed with the skb
* and the source address from the transport.
*/
ipv6_addr_copy(&fl.fl6_dst, &transport->ipaddr.v6.sin6_addr);
ipv6_addr_copy(&fl.fl6_src, &transport->saddr.v6.sin6_addr);
fl.fl6_flowlabel = np->flow_label;
IP6_ECN_flow_xmit(sk, fl.fl6_flowlabel);
if (ipv6_addr_type(&fl.fl6_src) & IPV6_ADDR_LINKLOCAL)
fl.oif = transport->saddr.v6.sin6_scope_id;
else
fl.oif = sk->sk_bound_dev_if;
fl.fl_ip_sport = inet_sk(sk)->sport;
fl.fl_ip_dport = transport->ipaddr.v6.sin6_port;
if (np->opt && np->opt->srcrt) {
struct rt0_hdr *rt0 = (struct rt0_hdr *) np->opt->srcrt;
ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
}
SCTP_DEBUG_PRINTK("%s: skb:%p, len:%d, "
"src:" NIP6_FMT " dst:" NIP6_FMT "\n",
__FUNCTION__, skb, skb->len,
NIP6(fl.fl6_src), NIP6(fl.fl6_dst));
SCTP_INC_STATS(SCTP_MIB_OUTSCTPPACKS);
return ip6_xmit(sk, skb, &fl, np->opt, ipfragok);
}
/* Returns the dst cache entry for the given source and destination ip
* addresses.
*/
static struct dst_entry *sctp_v6_get_dst(struct sctp_association *asoc,
union sctp_addr *daddr,
union sctp_addr *saddr)
{
struct dst_entry *dst;
struct flowi fl;
memset(&fl, 0, sizeof(fl));
ipv6_addr_copy(&fl.fl6_dst, &daddr->v6.sin6_addr);
if (ipv6_addr_type(&daddr->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL)
fl.oif = daddr->v6.sin6_scope_id;
SCTP_DEBUG_PRINTK("%s: DST=" NIP6_FMT " ",
__FUNCTION__, NIP6(fl.fl6_dst));
if (saddr) {
ipv6_addr_copy(&fl.fl6_src, &saddr->v6.sin6_addr);
SCTP_DEBUG_PRINTK(
"SRC=" NIP6_FMT " - ",
NIP6(fl.fl6_src));
}
dst = ip6_route_output(NULL, &fl);
if (dst) {
struct rt6_info *rt;
rt = (struct rt6_info *)dst;
SCTP_DEBUG_PRINTK(
"rt6_dst:" NIP6_FMT " rt6_src:" NIP6_FMT "\n",
NIP6(rt->rt6i_dst.addr), NIP6(rt->rt6i_src.addr));
} else {
SCTP_DEBUG_PRINTK("NO ROUTE\n");
}
return dst;
}
/* 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)
{
struct in6_addr *a1 = &s1->v6.sin6_addr;
struct in6_addr *a2 = &s2->v6.sin6_addr;
int i, j;
for (i = 0; i < 4 ; i++) {
__u32 a1xora2;
a1xora2 = a1->s6_addr32[i] ^ a2->s6_addr32[i];
if ((j = fls(ntohl(a1xora2))))
return (i * 32 + 32 - j);
}
return (i*32);
}
/* 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_association *asoc,
struct dst_entry *dst,
union sctp_addr *daddr,
union sctp_addr *saddr)
{
struct sctp_bind_addr *bp;
rwlock_t *addr_lock;
struct sctp_sockaddr_entry *laddr;
struct list_head *pos;
sctp_scope_t scope;
union sctp_addr *baddr = NULL;
__u8 matchlen = 0;
__u8 bmatchlen;
SCTP_DEBUG_PRINTK("%s: asoc:%p dst:%p "
"daddr:" NIP6_FMT " ",
__FUNCTION__, asoc, dst, NIP6(daddr->v6.sin6_addr));
if (!asoc) {
ipv6_get_saddr(dst, &daddr->v6.sin6_addr,&saddr->v6.sin6_addr);
SCTP_DEBUG_PRINTK("saddr from ipv6_get_saddr: " NIP6_FMT "\n",
NIP6(saddr->v6.sin6_addr));
return;
}
scope = sctp_scope(daddr);
bp = &asoc->base.bind_addr;
addr_lock = &asoc->base.addr_lock;
/* Go through the bind address list and find the best source address
* that matches the scope of the destination address.
*/
sctp_read_lock(addr_lock);
list_for_each(pos, &bp->address_list) {
laddr = list_entry(pos, struct sctp_sockaddr_entry, list);
if ((laddr->use_as_src) &&
(laddr->a.sa.sa_family == AF_INET6) &&
(scope <= sctp_scope(&laddr->a))) {
bmatchlen = sctp_v6_addr_match_len(daddr, &laddr->a);
if (!baddr || (matchlen < bmatchlen)) {
baddr = &laddr->a;
matchlen = bmatchlen;
}
}
}
if (baddr) {
memcpy(saddr, baddr, sizeof(union sctp_addr));
SCTP_DEBUG_PRINTK("saddr: " NIP6_FMT "\n",
NIP6(saddr->v6.sin6_addr));
} else {
printk(KERN_ERR "%s: asoc:%p Could not find a valid source "
"address for the dest:" NIP6_FMT "\n",
__FUNCTION__, asoc, NIP6(daddr->v6.sin6_addr));
}
sctp_read_unlock(addr_lock);
}
/* 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(&in6_dev->lock);
for (ifp = in6_dev->addr_list; ifp; ifp = ifp->if_next) {
/* Add the address to the local list. */
addr = t_new(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 = ifp->addr;
addr->a.v6.sin6_scope_id = dev->ifindex;
INIT_LIST_HEAD(&addr->list);
list_add_tail(&addr->list, addrlist);
}
}
read_unlock(&in6_dev->lock);
rcu_read_unlock();
}
/* 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)
{
void *from;
__u16 *port;
struct sctphdr *sh;
port = &addr->v6.sin6_port;
addr->v6.sin6_family = AF_INET6;
addr->v6.sin6_flowinfo = 0; /* FIXME */
addr->v6.sin6_scope_id = ((struct inet6_skb_parm *)skb->cb)->iif;
sh = (struct sctphdr *) skb->h.raw;
if (is_saddr) {
*port = ntohs(sh->source);
from = &skb->nh.ipv6h->saddr;
} else {
*port = ntohs(sh->dest);
from = &skb->nh.ipv6h->daddr;
}
ipv6_addr_copy(&addr->v6.sin6_addr, from);
}
/* 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 = inet_sk(sk)->num;
addr->v6.sin6_addr = inet6_sk(sk)->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 && sctp_sk(sk)->v4mapped) {
inet6_sk(sk)->rcv_saddr.s6_addr32[0] = 0;
inet6_sk(sk)->rcv_saddr.s6_addr32[1] = 0;
inet6_sk(sk)->rcv_saddr.s6_addr32[2] = htonl(0x0000ffff);
inet6_sk(sk)->rcv_saddr.s6_addr32[3] =
addr->v4.sin_addr.s_addr;
} else {
inet6_sk(sk)->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 && sctp_sk(sk)->v4mapped) {
inet6_sk(sk)->daddr.s6_addr32[0] = 0;
inet6_sk(sk)->daddr.s6_addr32[1] = 0;
inet6_sk(sk)->daddr.s6_addr32[2] = htonl(0x0000ffff);
inet6_sk(sk)->daddr.s6_addr32[3] = addr->v4.sin_addr.s_addr;
} else {
inet6_sk(sk)->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,
__u16 port, int iif)
{
addr->v6.sin6_family = AF_INET6;
addr->v6.sin6_port = port;
addr->v6.sin6_flowinfo = 0; /* BUG */
ipv6_addr_copy(&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(sctp_ipv6addr_param_t);
param->v6.param_hdr.type = SCTP_PARAM_IPV6_ADDRESS;
param->v6.param_hdr.length = ntohs(length);
ipv6_addr_copy(&param->v6.addr, &addr->v6.sin6_addr);
return length;
}
/* Initialize a sctp_addr from a dst_entry. */
static void sctp_v6_dst_saddr(union sctp_addr *addr, struct dst_entry *dst,
unsigned short port)
{
struct rt6_info *rt = (struct rt6_info *)dst;
addr->sa.sa_family = AF_INET6;
addr->v6.sin6_port = port;
ipv6_addr_copy(&addr->v6.sin6_addr, &rt->rt6i_src.addr);
}
/* 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)
{
if (addr1->sa.sa_family != addr2->sa.sa_family) {
if (addr1->sa.sa_family == AF_INET &&
addr2->sa.sa_family == AF_INET6 &&
IPV6_ADDR_MAPPED == ipv6_addr_type(&addr2->v6.sin6_addr)) {
if (addr2->v6.sin6_port == addr1->v4.sin_port &&
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_MAPPED == ipv6_addr_type(&addr1->v6.sin6_addr)) {
if (addr1->v6.sin6_port == addr2->v4.sin_port &&
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) {
if (addr1->v6.sin6_scope_id && addr2->v6.sin6_scope_id &&
(addr1->v6.sin6_scope_id != addr2->v6.sin6_scope_id)) {
return 0;
}
}
return 1;
}
/* Initialize addr struct to INADDR_ANY. */
static void sctp_v6_inaddr_any(union sctp_addr *addr, unsigned short 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 in6_addr *in6 = (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 && !sp->v4mapped)
return 0;
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 ipv6_chk_addr(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 || !sp->v4mapped)
return 0;
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 sctp_scope_t sctp_v6_scope(union sctp_addr *addr)
{
int v6scope;
sctp_scope_t retval;
/* 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)
{
struct inet_sock *inet = inet_sk(sk);
struct sock *newsk;
struct inet_sock *newinet;
struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
struct sctp6_sock *newsctp6sk;
newsk = sk_alloc(PF_INET6, GFP_KERNEL, sk->sk_prot, 1);
if (!newsk)
goto out;
sock_init_data(NULL, newsk);
newsk->sk_type = SOCK_STREAM;
newsk->sk_prot = sk->sk_prot;
newsk->sk_no_check = sk->sk_no_check;
newsk->sk_reuse = sk->sk_reuse;
newsk->sk_destruct = inet_sock_destruct;
newsk->sk_family = PF_INET6;
newsk->sk_protocol = IPPROTO_SCTP;
newsk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
newsk->sk_shutdown = sk->sk_shutdown;
sock_reset_flag(sk, SOCK_ZAPPED);
newsctp6sk = (struct sctp6_sock *)newsk;
inet_sk(newsk)->pinet6 = &newsctp6sk->inet6;
newinet = inet_sk(newsk);
newnp = inet6_sk(newsk);
memcpy(newnp, np, sizeof(struct ipv6_pinfo));
/* Initialize sk's sport, dport, rcv_saddr and daddr for getsockname()
* and getpeername().
*/
newinet->sport = inet->sport;
newnp->saddr = np->saddr;
newnp->rcv_saddr = np->rcv_saddr;
newinet->dport = htons(asoc->peer.port);
sctp_v6_to_sk_daddr(&asoc->peer.primary_addr, newsk);
/* Init the ipv4 part of the socket since we can have sockets
* using v6 API for ipv4.
*/
newinet->uc_ttl = -1;
newinet->mc_loop = 1;
newinet->mc_ttl = 1;
newinet->mc_index = 0;
newinet->mc_list = NULL;
if (ipv4_config.no_pmtu_disc)
newinet->pmtudisc = IP_PMTUDISC_DONT;
else
newinet->pmtudisc = IP_PMTUDISC_WANT;
sk_refcnt_debug_inc(newsk);
if (newsk->sk_prot->init(newsk)) {
sk_common_release(newsk);
newsk = NULL;
}
out:
return newsk;
}
/* Map v4 address to mapped v6 address */
static void sctp_v6_addr_v4map(struct sctp_sock *sp, union sctp_addr *addr)
{
if (sp->v4mapped && AF_INET == addr->sa.sa_family)
sctp_v4_map_v6(addr);
}
/* Where did this skb come from? */
static int sctp_v6_skb_iif(const struct sk_buff *skb)
{
struct inet6_skb_parm *opt = (struct inet6_skb_parm *) skb->cb;
return opt->iif;
}
/* Was this packet marked by Explicit Congestion Notification? */
static int sctp_v6_is_ce(const struct sk_buff *skb)
{
return *((__u32 *)(skb->nh.ipv6h)) & 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, NIP6_FMT " ", NIP6(addr->v6.sin6_addr));
}
/* Initialize a PF_INET6 socket msg_name. */
static void sctp_inet6_msgname(char *msgname, int *addr_len)
{
struct sockaddr_in6 *sin6;
sin6 = (struct sockaddr_in6 *)msgname;
sin6->sin6_family = AF_INET6;
sin6->sin6_flowinfo = 0;
sin6->sin6_scope_id = 0; /*FIXME */
*addr_len = sizeof(struct sockaddr_in6);
}
/* Initialize a PF_INET msgname from a ulpevent. */
static void sctp_inet6_event_msgname(struct sctp_ulpevent *event,
char *msgname, int *addrlen)
{
struct sockaddr_in6 *sin6, *sin6from;
if (msgname) {
union sctp_addr *addr;
struct sctp_association *asoc;
asoc = event->asoc;
sctp_inet6_msgname(msgname, addrlen);
sin6 = (struct sockaddr_in6 *)msgname;
sin6->sin6_port = htons(asoc->peer.port);
addr = &asoc->peer.primary_addr;
/* Note: If we go to a common v6 format, this code
* will change.
*/
/* Map ipv4 address into v4-mapped-on-v6 address. */
if (sctp_sk(asoc->base.sk)->v4mapped &&
AF_INET == addr->sa.sa_family) {
sctp_v4_map_v6((union sctp_addr *)sin6);
sin6->sin6_addr.s6_addr32[3] =
addr->v4.sin_addr.s_addr;
return;
}
sin6from = &asoc->peer.primary_addr.v6;
ipv6_addr_copy(&sin6->sin6_addr, &sin6from->sin6_addr);
if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
sin6->sin6_scope_id = sin6from->sin6_scope_id;
}
}
/* Initialize a msg_name from an inbound skb. */
static void sctp_inet6_skb_msgname(struct sk_buff *skb, char *msgname,
int *addr_len)
{
struct sctphdr *sh;
struct sockaddr_in6 *sin6;
if (msgname) {
sctp_inet6_msgname(msgname, addr_len);
sin6 = (struct sockaddr_in6 *)msgname;
sh = (struct sctphdr *)skb->h.raw;
sin6->sin6_port = sh->source;
/* Map ipv4 address into v4-mapped-on-v6 address. */
if (sctp_sk(skb->sk)->v4mapped &&
skb->nh.iph->version == 4) {
sctp_v4_map_v6((union sctp_addr *)sin6);
sin6->sin6_addr.s6_addr32[3] = skb->nh.iph->saddr;
return;
}
/* Otherwise, just copy the v6 address. */
ipv6_addr_copy(&sin6->sin6_addr, &skb->nh.ipv6h->saddr);
if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) {
struct sctp_ulpevent *ev = sctp_skb2event(skb);
sin6->sin6_scope_id = ev->iif;
}
}
}
/* 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)) && sp->v4mapped)
return 1;
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 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;
/* Today, wildcard AF_INET/AF_INET6. */
if (sctp_is_any(addr1) || sctp_is_any(addr2))
return 1;
if (addr1->sa.sa_family != addr2->sa.sa_family)
return 0;
return af1->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) {
if (!addr->v6.sin6_scope_id)
return 0;
dev = dev_get_by_index(addr->v6.sin6_scope_id);
if (!dev)
return 0;
dev_put(dev);
}
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;
dev = dev_get_by_index(addr->v6.sin6_scope_id);
if (!dev)
return 0;
dev_put(dev);
}
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,
__u16 *types)
{
types[0] = SCTP_PARAM_IPV4_ADDRESS;
types[1] = SCTP_PARAM_IPV6_ADDRESS;
return 2;
}
static const struct proto_ops inet6_seqpacket_ops = {
.family = PF_INET6,
.owner = THIS_MODULE,
.release = inet6_release,
.bind = inet6_bind,
.connect = inet_dgram_connect,
.socketpair = sock_no_socketpair,
.accept = inet_accept,
.getname = inet6_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 = sock_common_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,
.capability = -1,
.no_check = 0,
.flags = SCTP_PROTOSW_FLAG
};
static struct inet_protosw sctpv6_stream_protosw = {
.type = SOCK_STREAM,
.protocol = IPPROTO_SCTP,
.prot = &sctpv6_prot,
.ops = &inet6_seqpacket_ops,
.capability = -1,
.no_check = 0,
.flags = SCTP_PROTOSW_FLAG,
};
static int sctp6_rcv(struct sk_buff **pskb)
{
return sctp_rcv(*pskb) ? -1 : 0;
}
static 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_ipv6_specific = {
.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,
.to_sk_saddr = sctp_v6_to_sk_saddr,
.to_sk_daddr = sctp_v6_to_sk_daddr,
.from_addr_param = sctp_v6_from_addr_param,
.to_addr_param = sctp_v6_to_addr_param,
.dst_saddr = sctp_v6_dst_saddr,
.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,
.net_header_len = sizeof(struct ipv6hdr),
.sockaddr_len = sizeof(struct sockaddr_in6),
#ifdef CONFIG_COMPAT
.compat_setsockopt = compat_ipv6_setsockopt,
.compat_getsockopt = compat_ipv6_getsockopt,
#endif
};
static struct sctp_pf sctp_pf_inet6_specific = {
.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_v4map = sctp_v6_addr_v4map,
.af = &sctp_ipv6_specific,
};
/* Initialize IPv6 support and register with inet6 stack. */
int sctp_v6_init(void)
{
int rc = proto_register(&sctpv6_prot, 1);
if (rc)
goto out;
/* Register inet6 protocol. */
rc = -EAGAIN;
if (inet6_add_protocol(&sctpv6_protocol, IPPROTO_SCTP) < 0)
goto out_unregister_sctp_proto;
/* Add SCTPv6(UDP and TCP style) to inetsw6 linked list. */
inet6_register_protosw(&sctpv6_seqpacket_protosw);
inet6_register_protosw(&sctpv6_stream_protosw);
/* Register the SCTP specific PF_INET6 functions. */
sctp_register_pf(&sctp_pf_inet6_specific, PF_INET6);
/* Register the SCTP specific AF_INET6 functions. */
sctp_register_af(&sctp_ipv6_specific);
/* Register notifier for inet6 address additions/deletions. */
register_inet6addr_notifier(&sctp_inet6addr_notifier);
rc = 0;
out:
return rc;
out_unregister_sctp_proto:
proto_unregister(&sctpv6_prot);
goto out;
}
/* IPv6 specific exit support. */
void sctp_v6_exit(void)
{
list_del(&sctp_ipv6_specific.list);
inet6_del_protocol(&sctpv6_protocol, IPPROTO_SCTP);
inet6_unregister_protosw(&sctpv6_seqpacket_protosw);
inet6_unregister_protosw(&sctpv6_stream_protosw);
unregister_inet6addr_notifier(&sctp_inet6addr_notifier);
proto_unregister(&sctpv6_prot);
}
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