![David L Stevens](/assets/img/avatar_default.png)
Here is a simplified version of the patch to fix a bug in IPv6 multicasting. It: 1) adds existence check & EADDRINUSE error for regular joins 2) adds an exception for EADDRINUSE in the source-specific multicast join (where a prior join is ok) 3) adds a missing/needed read_lock on sock_mc_list; would've raced with destroying the socket on interface down without 4) adds a "leave group" in the (INCLUDE, empty) source filter case. This frees unneeded socket buffer memory, but also prevents an inappropriate interaction among the 8 socket options that mess with this. Some would fail as if in the group when you aren't really. Item #4 had a locking bug in the last version of this patch; rather than removing the idev->lock read lock only, I've simplified it to remove all lock state in the path and treat it as a direct "leave group" call for the (INCLUDE,empty) case it covers. Tested on an MP machine. :-) Much thanks to HoerdtMickael <hoerdt@clarinet.u-strasbg.fr> who reported the original bug. Signed-off-by: David L Stevens <dlstevens@us.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
706 lines
15 KiB
C
706 lines
15 KiB
C
/*
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* IPv6 BSD socket options interface
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* Linux INET6 implementation
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*
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* Authors:
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* Pedro Roque <roque@di.fc.ul.pt>
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*
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* Based on linux/net/ipv4/ip_sockglue.c
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*
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* $Id: ipv6_sockglue.c,v 1.41 2002/02/01 22:01:04 davem Exp $
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* FIXME: Make the setsockopt code POSIX compliant: That is
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*
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* o Return -EINVAL for setsockopt of short lengths
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* o Truncate getsockopt returns
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* o Return an optlen of the truncated length if need be
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*
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* Changes:
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* David L Stevens <dlstevens@us.ibm.com>:
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* - added multicast source filtering API for MLDv2
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*/
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#include <linux/module.h>
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#include <linux/config.h>
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#include <linux/errno.h>
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#include <linux/types.h>
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#include <linux/socket.h>
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#include <linux/sockios.h>
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#include <linux/sched.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/init.h>
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#include <linux/sysctl.h>
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#include <linux/netfilter.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/transp_v6.h>
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#include <net/ip6_route.h>
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#include <net/addrconf.h>
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#include <net/inet_common.h>
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#include <net/tcp.h>
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#include <net/udp.h>
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#include <net/xfrm.h>
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#include <asm/uaccess.h>
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DEFINE_SNMP_STAT(struct ipstats_mib, ipv6_statistics);
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static struct packet_type ipv6_packet_type = {
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.type = __constant_htons(ETH_P_IPV6),
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.func = ipv6_rcv,
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};
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struct ip6_ra_chain *ip6_ra_chain;
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DEFINE_RWLOCK(ip6_ra_lock);
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int ip6_ra_control(struct sock *sk, int sel, void (*destructor)(struct sock *))
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{
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struct ip6_ra_chain *ra, *new_ra, **rap;
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/* RA packet may be delivered ONLY to IPPROTO_RAW socket */
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if (sk->sk_type != SOCK_RAW || inet_sk(sk)->num != IPPROTO_RAW)
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return -EINVAL;
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new_ra = (sel>=0) ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
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write_lock_bh(&ip6_ra_lock);
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for (rap = &ip6_ra_chain; (ra=*rap) != NULL; rap = &ra->next) {
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if (ra->sk == sk) {
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if (sel>=0) {
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write_unlock_bh(&ip6_ra_lock);
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if (new_ra)
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kfree(new_ra);
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return -EADDRINUSE;
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}
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*rap = ra->next;
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write_unlock_bh(&ip6_ra_lock);
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if (ra->destructor)
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ra->destructor(sk);
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sock_put(sk);
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kfree(ra);
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return 0;
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}
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}
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if (new_ra == NULL) {
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write_unlock_bh(&ip6_ra_lock);
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return -ENOBUFS;
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}
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new_ra->sk = sk;
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new_ra->sel = sel;
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new_ra->destructor = destructor;
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new_ra->next = ra;
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*rap = new_ra;
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sock_hold(sk);
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write_unlock_bh(&ip6_ra_lock);
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return 0;
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}
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extern int ip6_mc_source(int add, int omode, struct sock *sk,
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struct group_source_req *pgsr);
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extern int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf);
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extern int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
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struct group_filter __user *optval, int __user *optlen);
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int ipv6_setsockopt(struct sock *sk, int level, int optname,
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char __user *optval, int optlen)
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{
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struct ipv6_pinfo *np = inet6_sk(sk);
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int val, valbool;
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int retv = -ENOPROTOOPT;
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if (level == SOL_IP && sk->sk_type != SOCK_RAW)
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return udp_prot.setsockopt(sk, level, optname, optval, optlen);
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if(level!=SOL_IPV6)
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goto out;
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if (optval == NULL)
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val=0;
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else if (get_user(val, (int __user *) optval))
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return -EFAULT;
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valbool = (val!=0);
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lock_sock(sk);
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switch (optname) {
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case IPV6_ADDRFORM:
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if (val == PF_INET) {
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struct ipv6_txoptions *opt;
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struct sk_buff *pktopt;
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if (sk->sk_protocol != IPPROTO_UDP &&
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sk->sk_protocol != IPPROTO_TCP)
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break;
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if (sk->sk_state != TCP_ESTABLISHED) {
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retv = -ENOTCONN;
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break;
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}
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if (ipv6_only_sock(sk) ||
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!(ipv6_addr_type(&np->daddr) & IPV6_ADDR_MAPPED)) {
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retv = -EADDRNOTAVAIL;
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break;
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}
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fl6_free_socklist(sk);
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ipv6_sock_mc_close(sk);
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if (sk->sk_protocol == IPPROTO_TCP) {
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struct tcp_sock *tp = tcp_sk(sk);
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local_bh_disable();
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sock_prot_dec_use(sk->sk_prot);
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sock_prot_inc_use(&tcp_prot);
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local_bh_enable();
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sk->sk_prot = &tcp_prot;
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tp->af_specific = &ipv4_specific;
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sk->sk_socket->ops = &inet_stream_ops;
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sk->sk_family = PF_INET;
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tcp_sync_mss(sk, tp->pmtu_cookie);
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} else {
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local_bh_disable();
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sock_prot_dec_use(sk->sk_prot);
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sock_prot_inc_use(&udp_prot);
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local_bh_enable();
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sk->sk_prot = &udp_prot;
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sk->sk_socket->ops = &inet_dgram_ops;
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sk->sk_family = PF_INET;
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}
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opt = xchg(&np->opt, NULL);
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if (opt)
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sock_kfree_s(sk, opt, opt->tot_len);
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pktopt = xchg(&np->pktoptions, NULL);
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if (pktopt)
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kfree_skb(pktopt);
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sk->sk_destruct = inet_sock_destruct;
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#ifdef INET_REFCNT_DEBUG
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atomic_dec(&inet6_sock_nr);
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#endif
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module_put(THIS_MODULE);
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retv = 0;
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break;
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}
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goto e_inval;
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case IPV6_V6ONLY:
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if (inet_sk(sk)->num)
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goto e_inval;
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np->ipv6only = valbool;
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retv = 0;
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break;
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case IPV6_PKTINFO:
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np->rxopt.bits.rxinfo = valbool;
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retv = 0;
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break;
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case IPV6_HOPLIMIT:
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np->rxopt.bits.rxhlim = valbool;
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retv = 0;
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break;
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case IPV6_RTHDR:
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if (val < 0 || val > 2)
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goto e_inval;
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np->rxopt.bits.srcrt = val;
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retv = 0;
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break;
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case IPV6_HOPOPTS:
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np->rxopt.bits.hopopts = valbool;
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retv = 0;
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break;
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case IPV6_DSTOPTS:
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np->rxopt.bits.dstopts = valbool;
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retv = 0;
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break;
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case IPV6_FLOWINFO:
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np->rxopt.bits.rxflow = valbool;
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retv = 0;
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break;
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case IPV6_PKTOPTIONS:
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{
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struct ipv6_txoptions *opt = NULL;
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struct msghdr msg;
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struct flowi fl;
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int junk;
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fl.fl6_flowlabel = 0;
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fl.oif = sk->sk_bound_dev_if;
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if (optlen == 0)
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goto update;
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/* 1K is probably excessive
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* 1K is surely not enough, 2K per standard header is 16K.
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*/
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retv = -EINVAL;
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if (optlen > 64*1024)
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break;
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opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
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retv = -ENOBUFS;
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if (opt == NULL)
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break;
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memset(opt, 0, sizeof(*opt));
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opt->tot_len = sizeof(*opt) + optlen;
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retv = -EFAULT;
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if (copy_from_user(opt+1, optval, optlen))
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goto done;
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msg.msg_controllen = optlen;
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msg.msg_control = (void*)(opt+1);
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retv = datagram_send_ctl(&msg, &fl, opt, &junk);
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if (retv)
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goto done;
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update:
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retv = 0;
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if (sk->sk_type == SOCK_STREAM) {
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if (opt) {
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struct tcp_sock *tp = tcp_sk(sk);
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if (!((1 << sk->sk_state) &
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(TCPF_LISTEN | TCPF_CLOSE))
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&& inet_sk(sk)->daddr != LOOPBACK4_IPV6) {
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tp->ext_header_len = opt->opt_flen + opt->opt_nflen;
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tcp_sync_mss(sk, tp->pmtu_cookie);
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}
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}
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opt = xchg(&np->opt, opt);
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sk_dst_reset(sk);
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} else {
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write_lock(&sk->sk_dst_lock);
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opt = xchg(&np->opt, opt);
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write_unlock(&sk->sk_dst_lock);
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sk_dst_reset(sk);
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}
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done:
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if (opt)
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sock_kfree_s(sk, opt, opt->tot_len);
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break;
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}
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case IPV6_UNICAST_HOPS:
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if (val > 255 || val < -1)
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goto e_inval;
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np->hop_limit = val;
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retv = 0;
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break;
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case IPV6_MULTICAST_HOPS:
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if (sk->sk_type == SOCK_STREAM)
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goto e_inval;
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if (val > 255 || val < -1)
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goto e_inval;
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np->mcast_hops = val;
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retv = 0;
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break;
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case IPV6_MULTICAST_LOOP:
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np->mc_loop = valbool;
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retv = 0;
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break;
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case IPV6_MULTICAST_IF:
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if (sk->sk_type == SOCK_STREAM)
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goto e_inval;
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if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != val)
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goto e_inval;
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if (__dev_get_by_index(val) == NULL) {
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retv = -ENODEV;
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break;
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}
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np->mcast_oif = val;
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retv = 0;
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break;
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case IPV6_ADD_MEMBERSHIP:
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case IPV6_DROP_MEMBERSHIP:
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{
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struct ipv6_mreq mreq;
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retv = -EFAULT;
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if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
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break;
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if (optname == IPV6_ADD_MEMBERSHIP)
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retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
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else
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retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
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break;
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}
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case IPV6_JOIN_ANYCAST:
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case IPV6_LEAVE_ANYCAST:
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{
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struct ipv6_mreq mreq;
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if (optlen != sizeof(struct ipv6_mreq))
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goto e_inval;
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retv = -EFAULT;
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if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
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break;
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if (optname == IPV6_JOIN_ANYCAST)
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retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
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else
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retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
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break;
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}
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case MCAST_JOIN_GROUP:
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case MCAST_LEAVE_GROUP:
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{
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struct group_req greq;
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struct sockaddr_in6 *psin6;
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retv = -EFAULT;
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if (copy_from_user(&greq, optval, sizeof(struct group_req)))
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break;
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if (greq.gr_group.ss_family != AF_INET6) {
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retv = -EADDRNOTAVAIL;
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break;
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}
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psin6 = (struct sockaddr_in6 *)&greq.gr_group;
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if (optname == MCAST_JOIN_GROUP)
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retv = ipv6_sock_mc_join(sk, greq.gr_interface,
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&psin6->sin6_addr);
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else
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retv = ipv6_sock_mc_drop(sk, greq.gr_interface,
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&psin6->sin6_addr);
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break;
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}
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case MCAST_JOIN_SOURCE_GROUP:
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case MCAST_LEAVE_SOURCE_GROUP:
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case MCAST_BLOCK_SOURCE:
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case MCAST_UNBLOCK_SOURCE:
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{
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struct group_source_req greqs;
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int omode, add;
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if (optlen != sizeof(struct group_source_req))
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goto e_inval;
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if (copy_from_user(&greqs, optval, sizeof(greqs))) {
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retv = -EFAULT;
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break;
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}
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if (greqs.gsr_group.ss_family != AF_INET6 ||
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greqs.gsr_source.ss_family != AF_INET6) {
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retv = -EADDRNOTAVAIL;
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break;
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}
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if (optname == MCAST_BLOCK_SOURCE) {
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omode = MCAST_EXCLUDE;
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add = 1;
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} else if (optname == MCAST_UNBLOCK_SOURCE) {
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omode = MCAST_EXCLUDE;
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add = 0;
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} else if (optname == MCAST_JOIN_SOURCE_GROUP) {
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struct sockaddr_in6 *psin6;
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psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
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retv = ipv6_sock_mc_join(sk, greqs.gsr_interface,
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&psin6->sin6_addr);
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/* prior join w/ different source is ok */
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if (retv && retv != -EADDRINUSE)
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break;
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omode = MCAST_INCLUDE;
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add = 1;
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} else /* MCAST_LEAVE_SOURCE_GROUP */ {
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omode = MCAST_INCLUDE;
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add = 0;
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}
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retv = ip6_mc_source(add, omode, sk, &greqs);
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break;
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}
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case MCAST_MSFILTER:
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{
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extern int sysctl_optmem_max;
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extern int sysctl_mld_max_msf;
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struct group_filter *gsf;
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if (optlen < GROUP_FILTER_SIZE(0))
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goto e_inval;
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if (optlen > sysctl_optmem_max) {
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retv = -ENOBUFS;
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break;
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}
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gsf = (struct group_filter *)kmalloc(optlen,GFP_KERNEL);
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if (gsf == 0) {
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retv = -ENOBUFS;
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break;
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}
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retv = -EFAULT;
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if (copy_from_user(gsf, optval, optlen)) {
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kfree(gsf);
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break;
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}
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/* numsrc >= (4G-140)/128 overflow in 32 bits */
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if (gsf->gf_numsrc >= 0x1ffffffU ||
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gsf->gf_numsrc > sysctl_mld_max_msf) {
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kfree(gsf);
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retv = -ENOBUFS;
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break;
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}
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if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
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kfree(gsf);
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retv = -EINVAL;
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break;
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}
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retv = ip6_mc_msfilter(sk, gsf);
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kfree(gsf);
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break;
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}
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case IPV6_ROUTER_ALERT:
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retv = ip6_ra_control(sk, val, NULL);
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break;
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case IPV6_MTU_DISCOVER:
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if (val<0 || val>2)
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goto e_inval;
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np->pmtudisc = val;
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retv = 0;
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break;
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case IPV6_MTU:
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if (val && val < IPV6_MIN_MTU)
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goto e_inval;
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np->frag_size = val;
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retv = 0;
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break;
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case IPV6_RECVERR:
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np->recverr = valbool;
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if (!val)
|
|
skb_queue_purge(&sk->sk_error_queue);
|
|
retv = 0;
|
|
break;
|
|
case IPV6_FLOWINFO_SEND:
|
|
np->sndflow = valbool;
|
|
retv = 0;
|
|
break;
|
|
case IPV6_FLOWLABEL_MGR:
|
|
retv = ipv6_flowlabel_opt(sk, optval, optlen);
|
|
break;
|
|
case IPV6_IPSEC_POLICY:
|
|
case IPV6_XFRM_POLICY:
|
|
retv = xfrm_user_policy(sk, optname, optval, optlen);
|
|
break;
|
|
|
|
#ifdef CONFIG_NETFILTER
|
|
default:
|
|
retv = nf_setsockopt(sk, PF_INET6, optname, optval,
|
|
optlen);
|
|
break;
|
|
#endif
|
|
|
|
}
|
|
release_sock(sk);
|
|
|
|
out:
|
|
return retv;
|
|
|
|
e_inval:
|
|
release_sock(sk);
|
|
return -EINVAL;
|
|
}
|
|
|
|
int ipv6_getsockopt(struct sock *sk, int level, int optname,
|
|
char __user *optval, int __user *optlen)
|
|
{
|
|
struct ipv6_pinfo *np = inet6_sk(sk);
|
|
int len;
|
|
int val;
|
|
|
|
if (level == SOL_IP && sk->sk_type != SOCK_RAW)
|
|
return udp_prot.getsockopt(sk, level, optname, optval, optlen);
|
|
if(level!=SOL_IPV6)
|
|
return -ENOPROTOOPT;
|
|
if (get_user(len, optlen))
|
|
return -EFAULT;
|
|
switch (optname) {
|
|
case IPV6_ADDRFORM:
|
|
if (sk->sk_protocol != IPPROTO_UDP &&
|
|
sk->sk_protocol != IPPROTO_TCP)
|
|
return -EINVAL;
|
|
if (sk->sk_state != TCP_ESTABLISHED)
|
|
return -ENOTCONN;
|
|
val = sk->sk_family;
|
|
break;
|
|
case MCAST_MSFILTER:
|
|
{
|
|
struct group_filter gsf;
|
|
int err;
|
|
|
|
if (len < GROUP_FILTER_SIZE(0))
|
|
return -EINVAL;
|
|
if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
|
|
return -EFAULT;
|
|
lock_sock(sk);
|
|
err = ip6_mc_msfget(sk, &gsf,
|
|
(struct group_filter __user *)optval, optlen);
|
|
release_sock(sk);
|
|
return err;
|
|
}
|
|
|
|
case IPV6_PKTOPTIONS:
|
|
{
|
|
struct msghdr msg;
|
|
struct sk_buff *skb;
|
|
|
|
if (sk->sk_type != SOCK_STREAM)
|
|
return -ENOPROTOOPT;
|
|
|
|
msg.msg_control = optval;
|
|
msg.msg_controllen = len;
|
|
msg.msg_flags = 0;
|
|
|
|
lock_sock(sk);
|
|
skb = np->pktoptions;
|
|
if (skb)
|
|
atomic_inc(&skb->users);
|
|
release_sock(sk);
|
|
|
|
if (skb) {
|
|
int err = datagram_recv_ctl(sk, &msg, skb);
|
|
kfree_skb(skb);
|
|
if (err)
|
|
return err;
|
|
} else {
|
|
if (np->rxopt.bits.rxinfo) {
|
|
struct in6_pktinfo src_info;
|
|
src_info.ipi6_ifindex = np->mcast_oif;
|
|
ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr);
|
|
put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
|
|
}
|
|
if (np->rxopt.bits.rxhlim) {
|
|
int hlim = np->mcast_hops;
|
|
put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
|
|
}
|
|
}
|
|
len -= msg.msg_controllen;
|
|
return put_user(len, optlen);
|
|
}
|
|
case IPV6_MTU:
|
|
{
|
|
struct dst_entry *dst;
|
|
val = 0;
|
|
lock_sock(sk);
|
|
dst = sk_dst_get(sk);
|
|
if (dst) {
|
|
val = dst_mtu(dst);
|
|
dst_release(dst);
|
|
}
|
|
release_sock(sk);
|
|
if (!val)
|
|
return -ENOTCONN;
|
|
break;
|
|
}
|
|
|
|
case IPV6_V6ONLY:
|
|
val = np->ipv6only;
|
|
break;
|
|
|
|
case IPV6_PKTINFO:
|
|
val = np->rxopt.bits.rxinfo;
|
|
break;
|
|
|
|
case IPV6_HOPLIMIT:
|
|
val = np->rxopt.bits.rxhlim;
|
|
break;
|
|
|
|
case IPV6_RTHDR:
|
|
val = np->rxopt.bits.srcrt;
|
|
break;
|
|
|
|
case IPV6_HOPOPTS:
|
|
val = np->rxopt.bits.hopopts;
|
|
break;
|
|
|
|
case IPV6_DSTOPTS:
|
|
val = np->rxopt.bits.dstopts;
|
|
break;
|
|
|
|
case IPV6_FLOWINFO:
|
|
val = np->rxopt.bits.rxflow;
|
|
break;
|
|
|
|
case IPV6_UNICAST_HOPS:
|
|
val = np->hop_limit;
|
|
break;
|
|
|
|
case IPV6_MULTICAST_HOPS:
|
|
val = np->mcast_hops;
|
|
break;
|
|
|
|
case IPV6_MULTICAST_LOOP:
|
|
val = np->mc_loop;
|
|
break;
|
|
|
|
case IPV6_MULTICAST_IF:
|
|
val = np->mcast_oif;
|
|
break;
|
|
|
|
case IPV6_MTU_DISCOVER:
|
|
val = np->pmtudisc;
|
|
break;
|
|
|
|
case IPV6_RECVERR:
|
|
val = np->recverr;
|
|
break;
|
|
|
|
case IPV6_FLOWINFO_SEND:
|
|
val = np->sndflow;
|
|
break;
|
|
|
|
default:
|
|
#ifdef CONFIG_NETFILTER
|
|
lock_sock(sk);
|
|
val = nf_getsockopt(sk, PF_INET6, optname, optval,
|
|
&len);
|
|
release_sock(sk);
|
|
if (val >= 0)
|
|
val = put_user(len, optlen);
|
|
return val;
|
|
#else
|
|
return -EINVAL;
|
|
#endif
|
|
}
|
|
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;
|
|
}
|
|
|
|
void __init ipv6_packet_init(void)
|
|
{
|
|
dev_add_pack(&ipv6_packet_type);
|
|
}
|
|
|
|
void ipv6_packet_cleanup(void)
|
|
{
|
|
dev_remove_pack(&ipv6_packet_type);
|
|
}
|