Commit 7dab83de authored by Vlad Yasevich's avatar Vlad Yasevich Committed by David S. Miller
Browse files

sctp: Support ipv6only AF_INET6 sockets.


Signed-off-by: default avatarVlad Yasevich <vladislav.yasevich@hp.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 6d0ccbac
......@@ -1211,6 +1211,8 @@ int sctp_add_bind_addr(struct sctp_bind_addr *, union sctp_addr *,
int sctp_del_bind_addr(struct sctp_bind_addr *, union sctp_addr *);
int sctp_bind_addr_match(struct sctp_bind_addr *, const union sctp_addr *,
struct sctp_sock *);
int sctp_bind_addr_conflict(struct sctp_bind_addr *, const union sctp_addr *,
struct sctp_sock *, struct sctp_sock *);
int sctp_bind_addr_state(const struct sctp_bind_addr *bp,
const union sctp_addr *addr);
union sctp_addr *sctp_find_unmatch_addr(struct sctp_bind_addr *bp,
......
......@@ -348,6 +348,43 @@ int sctp_bind_addr_match(struct sctp_bind_addr *bp,
return match;
}
/* Does the address 'addr' conflict with any addresses in
* the bp.
*/
int sctp_bind_addr_conflict(struct sctp_bind_addr *bp,
const union sctp_addr *addr,
struct sctp_sock *bp_sp,
struct sctp_sock *addr_sp)
{
struct sctp_sockaddr_entry *laddr;
int conflict = 0;
struct sctp_sock *sp;
/* Pick the IPv6 socket as the basis of comparison
* since it's usually a superset of the IPv4.
* If there is no IPv6 socket, then default to bind_addr.
*/
if (sctp_opt2sk(bp_sp)->sk_family == AF_INET6)
sp = bp_sp;
else if (sctp_opt2sk(addr_sp)->sk_family == AF_INET6)
sp = addr_sp;
else
sp = bp_sp;
rcu_read_lock();
list_for_each_entry_rcu(laddr, &bp->address_list, list) {
if (!laddr->valid)
continue;
conflict = sp->pf->cmp_addr(&laddr->a, addr, sp);
if (conflict)
break;
}
rcu_read_unlock();
return conflict;
}
/* Get the state of the entry in the bind_addr_list */
int sctp_bind_addr_state(const struct sctp_bind_addr *bp,
const union sctp_addr *addr)
......
......@@ -818,7 +818,7 @@ static int sctp_inet6_af_supported(sa_family_t family, struct sctp_sock *sp)
return 1;
/* v4-mapped-v6 addresses */
case AF_INET:
if (!__ipv6_only_sock(sctp_opt2sk(sp)) && sp->v4mapped)
if (!__ipv6_only_sock(sctp_opt2sk(sp)))
return 1;
default:
return 0;
......@@ -840,6 +840,11 @@ static int sctp_inet6_cmp_addr(const union sctp_addr *addr1,
if (!af1 || !af2)
return 0;
/* If the socket is IPv6 only, v4 addrs will not match */
if (__ipv6_only_sock(sctp_opt2sk(opt)) && af1 != af2)
return 0;
/* Today, wildcard AF_INET/AF_INET6. */
if (sctp_is_any(addr1) || sctp_is_any(addr2))
return 1;
......@@ -876,7 +881,11 @@ static int sctp_inet6_bind_verify(struct sctp_sock *opt, union sctp_addr *addr)
return 0;
}
dev_put(dev);
} else if (type == IPV6_ADDR_MAPPED) {
if (!opt->v4mapped)
return 0;
}
af = opt->pf->af;
}
return af->available(addr, opt);
......@@ -919,9 +928,12 @@ static int sctp_inet6_send_verify(struct sctp_sock *opt, union sctp_addr *addr)
static int sctp_inet6_supported_addrs(const struct sctp_sock *opt,
__be16 *types)
{
types[0] = SCTP_PARAM_IPV4_ADDRESS;
types[1] = SCTP_PARAM_IPV6_ADDRESS;
return 2;
types[0] = SCTP_PARAM_IPV6_ADDRESS;
if (!opt || !ipv6_only_sock(sctp_opt2sk(opt))) {
types[1] = SCTP_PARAM_IPV4_ADDRESS;
return 2;
}
return 1;
}
static const struct proto_ops inet6_seqpacket_ops = {
......
......@@ -381,6 +381,10 @@ static int sctp_v4_addr_valid(union sctp_addr *addr,
struct sctp_sock *sp,
const struct sk_buff *skb)
{
/* IPv4 addresses not allowed */
if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
return 0;
/* Is this a non-unicast address or a unusable SCTP address? */
if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr))
return 0;
......@@ -404,6 +408,9 @@ static int sctp_v4_available(union sctp_addr *addr, struct sctp_sock *sp)
!sysctl_ip_nonlocal_bind)
return 0;
if (ipv6_only_sock(sctp_opt2sk(sp)))
return 0;
return 1;
}
......
......@@ -2364,8 +2364,13 @@ static int sctp_process_param(struct sctp_association *asoc,
case SCTP_PARAM_IPV6_ADDRESS:
if (PF_INET6 != asoc->base.sk->sk_family)
break;
/* Fall through. */
goto do_addr_param;
case SCTP_PARAM_IPV4_ADDRESS:
/* v4 addresses are not allowed on v6-only socket */
if (ipv6_only_sock(asoc->base.sk))
break;
do_addr_param:
af = sctp_get_af_specific(param_type2af(param.p->type));
af->from_addr_param(&addr, param.addr, htons(asoc->peer.port), 0);
scope = sctp_scope(peer_addr);
......
......@@ -308,9 +308,16 @@ static struct sctp_af *sctp_sockaddr_af(struct sctp_sock *opt,
if (len < sizeof (struct sockaddr))
return NULL;
/* Does this PF support this AF? */
if (!opt->pf->af_supported(addr->sa.sa_family, opt))
return NULL;
/* V4 mapped address are really of AF_INET family */
if (addr->sa.sa_family == AF_INET6 &&
ipv6_addr_v4mapped(&addr->v6.sin6_addr)) {
if (!opt->pf->af_supported(AF_INET, opt))
return NULL;
} else {
/* Does this PF support this AF? */
if (!opt->pf->af_supported(addr->sa.sa_family, opt))
return NULL;
}
/* If we get this far, af is valid. */
af = sctp_get_af_specific(addr->sa.sa_family);
......@@ -4395,6 +4402,11 @@ static int sctp_getsockopt_local_addrs_num_old(struct sock *sk, int len,
(AF_INET6 == addr->a.sa.sa_family))
continue;
if ((PF_INET6 == sk->sk_family) &&
inet_v6_ipv6only(sk) &&
(AF_INET == addr->a.sa.sa_family))
continue;
cnt++;
}
rcu_read_unlock();
......@@ -4435,6 +4447,10 @@ static int sctp_copy_laddrs_old(struct sock *sk, __u16 port,
if ((PF_INET == sk->sk_family) &&
(AF_INET6 == addr->a.sa.sa_family))
continue;
if ((PF_INET6 == sk->sk_family) &&
inet_v6_ipv6only(sk) &&
(AF_INET == addr->a.sa.sa_family))
continue;
memcpy(&temp, &addr->a, sizeof(temp));
if (!temp.v4.sin_port)
temp.v4.sin_port = htons(port);
......@@ -4470,6 +4486,10 @@ static int sctp_copy_laddrs(struct sock *sk, __u16 port, void *to,
if ((PF_INET == sk->sk_family) &&
(AF_INET6 == addr->a.sa.sa_family))
continue;
if ((PF_INET6 == sk->sk_family) &&
inet_v6_ipv6only(sk) &&
(AF_INET == addr->a.sa.sa_family))
continue;
memcpy(&temp, &addr->a, sizeof(temp));
if (!temp.v4.sin_port)
temp.v4.sin_port = htons(port);
......@@ -5568,8 +5588,8 @@ static long sctp_get_port_local(struct sock *sk, union sctp_addr *addr)
sk2->sk_state != SCTP_SS_LISTENING)
continue;
if (sctp_bind_addr_match(&ep2->base.bind_addr, addr,
sctp_sk(sk))) {
if (sctp_bind_addr_conflict(&ep2->base.bind_addr, addr,
sctp_sk(sk2), sctp_sk(sk))) {
ret = (long)sk2;
goto fail_unlock;
}
......
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