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https://github.com/adulau/aha.git
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[NET]: Make AF_PACKET handle multiple network namespaces
This is done by making packet_sklist_lock and packet_sklist per network namespace and adding an additional filter condition on received packets to ensure they came from the proper network namespace. Changes from v1: - prohibit to call inet_dgram_ops.ioctl in other than init_net Signed-off-by: Denis V. Lunev <den@openvz.org> Signed-off-by: Eric W. Biederman <ebiederm@xmission.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Denis V. Lunev
David S. Miller
parent
4b3da706bb
commit
d12d01d6b4
2 changed files with 89 additions and 46 deletions
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@ -32,6 +32,10 @@ struct net {
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struct hlist_head *dev_index_head;
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struct sock *rtnl; /* rtnetlink socket */
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/* List of all packet sockets. */
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rwlock_t packet_sklist_lock;
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struct hlist_head packet_sklist;
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};
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#ifdef CONFIG_NET
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@ -135,10 +135,6 @@ dev->hard_header == NULL (ll header is added by device, we cannot control it)
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packet classifier depends on it.
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*/
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/* List of all packet sockets. */
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static HLIST_HEAD(packet_sklist);
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static DEFINE_RWLOCK(packet_sklist_lock);
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/* Private packet socket structures. */
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struct packet_mclist
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@ -246,9 +242,6 @@ static int packet_rcv_spkt(struct sk_buff *skb, struct net_device *dev, struct
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struct sock *sk;
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struct sockaddr_pkt *spkt;
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if (dev->nd_net != &init_net)
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goto out;
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/*
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* When we registered the protocol we saved the socket in the data
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* field for just this event.
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@ -270,6 +263,9 @@ static int packet_rcv_spkt(struct sk_buff *skb, struct net_device *dev, struct
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if (skb->pkt_type == PACKET_LOOPBACK)
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goto out;
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if (dev->nd_net != sk->sk_net)
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goto out;
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if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
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goto oom;
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@ -341,7 +337,7 @@ static int packet_sendmsg_spkt(struct kiocb *iocb, struct socket *sock,
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*/
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saddr->spkt_device[13] = 0;
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dev = dev_get_by_name(&init_net, saddr->spkt_device);
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dev = dev_get_by_name(sk->sk_net, saddr->spkt_device);
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err = -ENODEV;
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if (dev == NULL)
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goto out_unlock;
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@ -449,15 +445,15 @@ static int packet_rcv(struct sk_buff *skb, struct net_device *dev, struct packet
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int skb_len = skb->len;
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unsigned int snaplen, res;
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if (dev->nd_net != &init_net)
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goto drop;
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if (skb->pkt_type == PACKET_LOOPBACK)
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goto drop;
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sk = pt->af_packet_priv;
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po = pkt_sk(sk);
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if (dev->nd_net != sk->sk_net)
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goto drop;
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skb->dev = dev;
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if (dev->header_ops) {
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@ -566,15 +562,15 @@ static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev, struct packe
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struct sk_buff *copy_skb = NULL;
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struct timeval tv;
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if (dev->nd_net != &init_net)
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goto drop;
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if (skb->pkt_type == PACKET_LOOPBACK)
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goto drop;
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sk = pt->af_packet_priv;
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po = pkt_sk(sk);
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if (dev->nd_net != sk->sk_net)
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goto drop;
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if (dev->header_ops) {
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if (sk->sk_type != SOCK_DGRAM)
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skb_push(skb, skb->data - skb_mac_header(skb));
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@ -732,7 +728,7 @@ static int packet_sendmsg(struct kiocb *iocb, struct socket *sock,
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}
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dev = dev_get_by_index(&init_net, ifindex);
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dev = dev_get_by_index(sk->sk_net, ifindex);
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err = -ENXIO;
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if (dev == NULL)
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goto out_unlock;
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@ -799,15 +795,17 @@ static int packet_release(struct socket *sock)
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{
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struct sock *sk = sock->sk;
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struct packet_sock *po;
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struct net *net;
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if (!sk)
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return 0;
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net = sk->sk_net;
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po = pkt_sk(sk);
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write_lock_bh(&packet_sklist_lock);
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write_lock_bh(&net->packet_sklist_lock);
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sk_del_node_init(sk);
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write_unlock_bh(&packet_sklist_lock);
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write_unlock_bh(&net->packet_sklist_lock);
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/*
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* Unhook packet receive handler.
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@ -916,7 +914,7 @@ static int packet_bind_spkt(struct socket *sock, struct sockaddr *uaddr, int add
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return -EINVAL;
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strlcpy(name,uaddr->sa_data,sizeof(name));
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dev = dev_get_by_name(&init_net, name);
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dev = dev_get_by_name(sk->sk_net, name);
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if (dev) {
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err = packet_do_bind(sk, dev, pkt_sk(sk)->num);
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dev_put(dev);
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@ -943,7 +941,7 @@ static int packet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len
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if (sll->sll_ifindex) {
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err = -ENODEV;
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dev = dev_get_by_index(&init_net, sll->sll_ifindex);
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dev = dev_get_by_index(sk->sk_net, sll->sll_ifindex);
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if (dev == NULL)
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goto out;
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}
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@ -972,9 +970,6 @@ static int packet_create(struct net *net, struct socket *sock, int protocol)
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__be16 proto = (__force __be16)protocol; /* weird, but documented */
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int err;
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if (net != &init_net)
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return -EAFNOSUPPORT;
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if (!capable(CAP_NET_RAW))
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return -EPERM;
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if (sock->type != SOCK_DGRAM && sock->type != SOCK_RAW &&
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@ -1020,9 +1015,9 @@ static int packet_create(struct net *net, struct socket *sock, int protocol)
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po->running = 1;
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}
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write_lock_bh(&packet_sklist_lock);
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sk_add_node(sk, &packet_sklist);
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write_unlock_bh(&packet_sklist_lock);
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write_lock_bh(&net->packet_sklist_lock);
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sk_add_node(sk, &net->packet_sklist);
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write_unlock_bh(&net->packet_sklist_lock);
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return(0);
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out:
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return err;
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@ -1140,7 +1135,7 @@ static int packet_getname_spkt(struct socket *sock, struct sockaddr *uaddr,
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return -EOPNOTSUPP;
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uaddr->sa_family = AF_PACKET;
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dev = dev_get_by_index(&init_net, pkt_sk(sk)->ifindex);
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dev = dev_get_by_index(sk->sk_net, pkt_sk(sk)->ifindex);
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if (dev) {
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strlcpy(uaddr->sa_data, dev->name, 15);
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dev_put(dev);
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@ -1165,7 +1160,7 @@ static int packet_getname(struct socket *sock, struct sockaddr *uaddr,
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sll->sll_family = AF_PACKET;
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sll->sll_ifindex = po->ifindex;
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sll->sll_protocol = po->num;
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dev = dev_get_by_index(&init_net, po->ifindex);
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dev = dev_get_by_index(sk->sk_net, po->ifindex);
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if (dev) {
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sll->sll_hatype = dev->type;
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sll->sll_halen = dev->addr_len;
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@ -1217,7 +1212,7 @@ static int packet_mc_add(struct sock *sk, struct packet_mreq_max *mreq)
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rtnl_lock();
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err = -ENODEV;
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dev = __dev_get_by_index(&init_net, mreq->mr_ifindex);
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dev = __dev_get_by_index(sk->sk_net, mreq->mr_ifindex);
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if (!dev)
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goto done;
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@ -1271,7 +1266,7 @@ static int packet_mc_drop(struct sock *sk, struct packet_mreq_max *mreq)
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if (--ml->count == 0) {
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struct net_device *dev;
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*mlp = ml->next;
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dev = dev_get_by_index(&init_net, ml->ifindex);
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dev = dev_get_by_index(sk->sk_net, ml->ifindex);
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if (dev) {
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packet_dev_mc(dev, ml, -1);
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dev_put(dev);
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@ -1299,7 +1294,7 @@ static void packet_flush_mclist(struct sock *sk)
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struct net_device *dev;
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po->mclist = ml->next;
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if ((dev = dev_get_by_index(&init_net, ml->ifindex)) != NULL) {
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if ((dev = dev_get_by_index(sk->sk_net, ml->ifindex)) != NULL) {
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packet_dev_mc(dev, ml, -1);
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dev_put(dev);
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}
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@ -1455,12 +1450,10 @@ static int packet_notifier(struct notifier_block *this, unsigned long msg, void
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struct sock *sk;
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struct hlist_node *node;
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struct net_device *dev = data;
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struct net *net = dev->nd_net;
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if (dev->nd_net != &init_net)
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return NOTIFY_DONE;
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read_lock(&packet_sklist_lock);
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sk_for_each(sk, node, &packet_sklist) {
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read_lock(&net->packet_sklist_lock);
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sk_for_each(sk, node, &net->packet_sklist) {
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struct packet_sock *po = pkt_sk(sk);
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switch (msg) {
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@ -1499,7 +1492,7 @@ static int packet_notifier(struct notifier_block *this, unsigned long msg, void
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break;
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}
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}
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read_unlock(&packet_sklist_lock);
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read_unlock(&net->packet_sklist_lock);
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return NOTIFY_DONE;
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}
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@ -1547,6 +1540,8 @@ static int packet_ioctl(struct socket *sock, unsigned int cmd,
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case SIOCGIFDSTADDR:
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case SIOCSIFDSTADDR:
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case SIOCSIFFLAGS:
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if (sk->sk_net != &init_net)
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return -ENOIOCTLCMD;
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return inet_dgram_ops.ioctl(sock, cmd, arg);
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#endif
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@ -1862,12 +1857,12 @@ static struct notifier_block packet_netdev_notifier = {
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};
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#ifdef CONFIG_PROC_FS
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static inline struct sock *packet_seq_idx(loff_t off)
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static inline struct sock *packet_seq_idx(struct net *net, loff_t off)
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{
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struct sock *s;
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struct hlist_node *node;
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sk_for_each(s, node, &packet_sklist) {
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sk_for_each(s, node, &net->packet_sklist) {
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if (!off--)
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return s;
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}
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@ -1876,21 +1871,24 @@ static inline struct sock *packet_seq_idx(loff_t off)
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static void *packet_seq_start(struct seq_file *seq, loff_t *pos)
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{
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read_lock(&packet_sklist_lock);
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return *pos ? packet_seq_idx(*pos - 1) : SEQ_START_TOKEN;
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struct net *net = seq->private;
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read_lock(&net->packet_sklist_lock);
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return *pos ? packet_seq_idx(net, *pos - 1) : SEQ_START_TOKEN;
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}
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static void *packet_seq_next(struct seq_file *seq, void *v, loff_t *pos)
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{
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struct net *net = seq->private;
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++*pos;
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return (v == SEQ_START_TOKEN)
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? sk_head(&packet_sklist)
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? sk_head(&net->packet_sklist)
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: sk_next((struct sock*)v) ;
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}
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static void packet_seq_stop(struct seq_file *seq, void *v)
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{
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read_unlock(&packet_sklist_lock);
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struct net *net = seq->private;
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read_unlock(&net->packet_sklist_lock);
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}
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static int packet_seq_show(struct seq_file *seq, void *v)
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@ -1926,7 +1924,26 @@ static const struct seq_operations packet_seq_ops = {
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static int packet_seq_open(struct inode *inode, struct file *file)
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{
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return seq_open(file, &packet_seq_ops);
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struct seq_file *seq;
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int res;
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res = seq_open(file, &packet_seq_ops);
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if (!res) {
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seq = file->private_data;
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seq->private = get_proc_net(inode);
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if (!seq->private) {
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seq_release(inode, file);
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res = -ENXIO;
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}
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}
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return res;
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}
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static int packet_seq_release(struct inode *inode, struct file *file)
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{
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struct seq_file *seq= file->private_data;
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struct net *net = seq->private;
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put_net(net);
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return seq_release(inode, file);
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}
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static const struct file_operations packet_seq_fops = {
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@ -1934,15 +1951,37 @@ static const struct file_operations packet_seq_fops = {
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.open = packet_seq_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = seq_release,
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.release = packet_seq_release,
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};
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#endif
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static int packet_net_init(struct net *net)
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{
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rwlock_init(&net->packet_sklist_lock);
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INIT_HLIST_HEAD(&net->packet_sklist);
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if (!proc_net_fops_create(net, "packet", 0, &packet_seq_fops))
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return -ENOMEM;
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return 0;
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}
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static void packet_net_exit(struct net *net)
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{
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proc_net_remove(net, "packet");
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}
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static struct pernet_operations packet_net_ops = {
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.init = packet_net_init,
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.exit = packet_net_exit,
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};
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static void __exit packet_exit(void)
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{
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proc_net_remove(&init_net, "packet");
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unregister_netdevice_notifier(&packet_netdev_notifier);
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unregister_pernet_subsys(&packet_net_ops);
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sock_unregister(PF_PACKET);
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proto_unregister(&packet_proto);
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}
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@ -1955,8 +1994,8 @@ static int __init packet_init(void)
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goto out;
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sock_register(&packet_family_ops);
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register_pernet_subsys(&packet_net_ops);
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register_netdevice_notifier(&packet_netdev_notifier);
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proc_net_fops_create(&init_net, "packet", 0, &packet_seq_fops);
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out:
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return rc;
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}
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