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mctp: Implement extended addressing
This change allows an extended address struct - struct sockaddr_mctp_ext - to be passed to sendmsg/recvmsg. This allows userspace to specify output ifindex and physical address information (for sendmsg) or receive the input ifindex/physaddr for incoming messages (for recvmsg). This is typically used by userspace for MCTP address discovery and assignment operations. The extended addressing facility is conditional on a new sockopt: MCTP_OPT_ADDR_EXT; userspace must explicitly enable addressing before the kernel will consume/populate the extended address data. Includes a fix for an uninitialised var: Reported-by: kernel test robot <lkp@intel.com> Signed-off-by: Jeremy Kerr <jk@codeconstruct.com.au> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jeremy Kerr
David S. Miller
parent
971f5c4079
commit
99ce45d5e7
@ -365,6 +365,7 @@ struct ucred {
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#define SOL_TLS 282
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#define SOL_XDP 283
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#define SOL_MPTCP 284
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#define SOL_MCTP 285
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/* IPX options */
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#define IPX_TYPE 1
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@ -11,6 +11,7 @@
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#include <linux/bits.h>
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#include <linux/mctp.h>
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#include <linux/netdevice.h>
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#include <net/net_namespace.h>
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#include <net/sock.h>
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@ -58,6 +59,9 @@ struct mctp_sock {
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mctp_eid_t bind_addr;
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__u8 bind_type;
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/* sendmsg()/recvmsg() uses struct sockaddr_mctp_ext */
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bool addr_ext;
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/* list of mctp_sk_key, for incoming tag lookup. updates protected
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* by sk->net->keys_lock
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*/
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@ -153,7 +157,10 @@ struct mctp_sk_key {
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struct mctp_skb_cb {
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unsigned int magic;
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unsigned int net;
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int ifindex; /* extended/direct addressing if set */
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mctp_eid_t src;
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unsigned char halen;
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unsigned char haddr[MAX_ADDR_LEN];
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};
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/* skb control-block accessors with a little extra debugging for initial
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@ -177,6 +184,7 @@ static inline struct mctp_skb_cb *mctp_cb(struct sk_buff *skb)
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{
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struct mctp_skb_cb *cb = (void *)skb->cb;
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BUILD_BUG_ON(sizeof(struct mctp_skb_cb) > sizeof(skb->cb));
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WARN_ON(cb->magic != 0x4d435450);
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return (void *)(skb->cb);
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}
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@ -189,8 +197,7 @@ static inline struct mctp_skb_cb *mctp_cb(struct sk_buff *skb)
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*
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* Updates to the route table are performed under rtnl; all reads under RCU,
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* so routes cannot be referenced over a RCU grace period. Specifically: A
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* caller cannot block between mctp_route_lookup and passing the route to
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* mctp_do_route.
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* caller cannot block between mctp_route_lookup and mctp_route_release()
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*/
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struct mctp_route {
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mctp_eid_t min, max;
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@ -210,8 +217,6 @@ struct mctp_route {
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struct mctp_route *mctp_route_lookup(struct net *net, unsigned int dnet,
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mctp_eid_t daddr);
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int mctp_do_route(struct mctp_route *rt, struct sk_buff *skb);
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int mctp_local_output(struct sock *sk, struct mctp_route *rt,
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struct sk_buff *skb, mctp_eid_t daddr, u8 req_tag);
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@ -11,6 +11,7 @@
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#include <linux/types.h>
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#include <linux/socket.h>
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#include <linux/netdevice.h>
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typedef __u8 mctp_eid_t;
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@ -28,6 +29,14 @@ struct sockaddr_mctp {
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__u8 __smctp_pad1;
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};
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struct sockaddr_mctp_ext {
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struct sockaddr_mctp smctp_base;
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int smctp_ifindex;
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__u8 smctp_halen;
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__u8 __smctp_pad0[3];
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__u8 smctp_haddr[MAX_ADDR_LEN];
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};
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#define MCTP_NET_ANY 0x0
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#define MCTP_ADDR_NULL 0x00
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@ -36,4 +45,6 @@ struct sockaddr_mctp {
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#define MCTP_TAG_MASK 0x07
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#define MCTP_TAG_OWNER 0x08
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#define MCTP_OPT_ADDR_EXT 1
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#endif /* __UAPI_MCTP_H */
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@ -77,6 +77,7 @@ static int mctp_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
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const int hlen = MCTP_HEADER_MAXLEN + sizeof(struct mctp_hdr);
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int rc, addrlen = msg->msg_namelen;
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struct sock *sk = sock->sk;
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struct mctp_sock *msk = container_of(sk, struct mctp_sock, sk);
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struct mctp_skb_cb *cb;
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struct mctp_route *rt;
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struct sk_buff *skb;
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@ -100,11 +101,6 @@ static int mctp_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
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if (addr->smctp_network == MCTP_NET_ANY)
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addr->smctp_network = mctp_default_net(sock_net(sk));
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rt = mctp_route_lookup(sock_net(sk), addr->smctp_network,
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addr->smctp_addr.s_addr);
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if (!rt)
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return -EHOSTUNREACH;
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skb = sock_alloc_send_skb(sk, hlen + 1 + len,
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msg->msg_flags & MSG_DONTWAIT, &rc);
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if (!skb)
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@ -116,19 +112,45 @@ static int mctp_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
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*(u8 *)skb_put(skb, 1) = addr->smctp_type;
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rc = memcpy_from_msg((void *)skb_put(skb, len), msg, len);
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if (rc < 0) {
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kfree_skb(skb);
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return rc;
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}
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if (rc < 0)
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goto err_free;
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/* set up cb */
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cb = __mctp_cb(skb);
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cb->net = addr->smctp_network;
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/* direct addressing */
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if (msk->addr_ext && addrlen >= sizeof(struct sockaddr_mctp_ext)) {
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DECLARE_SOCKADDR(struct sockaddr_mctp_ext *,
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extaddr, msg->msg_name);
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if (extaddr->smctp_halen > sizeof(cb->haddr)) {
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rc = -EINVAL;
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goto err_free;
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}
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cb->ifindex = extaddr->smctp_ifindex;
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cb->halen = extaddr->smctp_halen;
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memcpy(cb->haddr, extaddr->smctp_haddr, cb->halen);
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rt = NULL;
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} else {
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rt = mctp_route_lookup(sock_net(sk), addr->smctp_network,
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addr->smctp_addr.s_addr);
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if (!rt) {
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rc = -EHOSTUNREACH;
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goto err_free;
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}
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}
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rc = mctp_local_output(sk, rt, skb, addr->smctp_addr.s_addr,
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addr->smctp_tag);
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return rc ? : len;
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err_free:
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kfree_skb(skb);
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return rc;
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}
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static int mctp_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
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@ -136,6 +158,7 @@ static int mctp_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
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{
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DECLARE_SOCKADDR(struct sockaddr_mctp *, addr, msg->msg_name);
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struct sock *sk = sock->sk;
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struct mctp_sock *msk = container_of(sk, struct mctp_sock, sk);
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struct sk_buff *skb;
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size_t msglen;
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u8 type;
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@ -181,6 +204,16 @@ static int mctp_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
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addr->smctp_tag = hdr->flags_seq_tag &
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(MCTP_HDR_TAG_MASK | MCTP_HDR_FLAG_TO);
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msg->msg_namelen = sizeof(*addr);
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if (msk->addr_ext) {
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DECLARE_SOCKADDR(struct sockaddr_mctp_ext *, ae,
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msg->msg_name);
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msg->msg_namelen = sizeof(*ae);
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ae->smctp_ifindex = cb->ifindex;
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ae->smctp_halen = cb->halen;
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memset(ae->smctp_haddr, 0x0, sizeof(ae->smctp_haddr));
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memcpy(ae->smctp_haddr, cb->haddr, cb->halen);
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}
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}
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rc = len;
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@ -196,12 +229,45 @@ out_free:
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static int mctp_setsockopt(struct socket *sock, int level, int optname,
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sockptr_t optval, unsigned int optlen)
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{
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return -EINVAL;
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struct mctp_sock *msk = container_of(sock->sk, struct mctp_sock, sk);
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int val;
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if (level != SOL_MCTP)
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return -EINVAL;
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if (optname == MCTP_OPT_ADDR_EXT) {
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if (optlen != sizeof(int))
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return -EINVAL;
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if (copy_from_sockptr(&val, optval, sizeof(int)))
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return -EFAULT;
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msk->addr_ext = val;
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return 0;
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}
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return -ENOPROTOOPT;
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}
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static int mctp_getsockopt(struct socket *sock, int level, int optname,
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char __user *optval, int __user *optlen)
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{
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struct mctp_sock *msk = container_of(sock->sk, struct mctp_sock, sk);
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int len, val;
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if (level != SOL_MCTP)
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return -EINVAL;
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if (get_user(len, optlen))
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return -EFAULT;
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if (optname == MCTP_OPT_ADDR_EXT) {
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if (len != sizeof(int))
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return -EINVAL;
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val = !!msk->addr_ext;
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if (copy_to_user(optval, &val, len))
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return -EFAULT;
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return 0;
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}
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return -EINVAL;
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}
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@ -434,6 +434,7 @@ static unsigned int mctp_route_mtu(struct mctp_route *rt)
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static int mctp_route_output(struct mctp_route *route, struct sk_buff *skb)
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{
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struct mctp_skb_cb *cb = mctp_cb(skb);
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struct mctp_hdr *hdr = mctp_hdr(skb);
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char daddr_buf[MAX_ADDR_LEN];
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char *daddr = NULL;
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@ -448,9 +449,14 @@ static int mctp_route_output(struct mctp_route *route, struct sk_buff *skb)
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return -EMSGSIZE;
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}
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/* If lookup fails let the device handle daddr==NULL */
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if (mctp_neigh_lookup(route->dev, hdr->dest, daddr_buf) == 0)
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daddr = daddr_buf;
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if (cb->ifindex) {
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/* direct route; use the hwaddr we stashed in sendmsg */
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daddr = cb->haddr;
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} else {
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/* If lookup fails let the device handle daddr==NULL */
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if (mctp_neigh_lookup(route->dev, hdr->dest, daddr_buf) == 0)
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daddr = daddr_buf;
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}
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rc = dev_hard_header(skb, skb->dev, ntohs(skb->protocol),
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daddr, skb->dev->dev_addr, skb->len);
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@ -649,16 +655,6 @@ static struct mctp_route *mctp_route_lookup_null(struct net *net,
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return NULL;
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}
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/* sends a skb to rt and releases the route. */
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int mctp_do_route(struct mctp_route *rt, struct sk_buff *skb)
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{
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int rc;
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rc = rt->output(rt, skb);
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mctp_route_release(rt);
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return rc;
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}
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static int mctp_do_fragment_route(struct mctp_route *rt, struct sk_buff *skb,
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unsigned int mtu, u8 tag)
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{
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@ -725,7 +721,7 @@ static int mctp_do_fragment_route(struct mctp_route *rt, struct sk_buff *skb,
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/* copy message payload */
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skb_copy_bits(skb, pos, skb_transport_header(skb2), size);
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/* do route, but don't drop the rt reference */
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/* do route */
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rc = rt->output(rt, skb2);
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if (rc)
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break;
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@ -734,7 +730,6 @@ static int mctp_do_fragment_route(struct mctp_route *rt, struct sk_buff *skb,
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pos += size;
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}
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mctp_route_release(rt);
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consume_skb(skb);
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return rc;
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}
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@ -744,15 +739,51 @@ int mctp_local_output(struct sock *sk, struct mctp_route *rt,
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{
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struct mctp_sock *msk = container_of(sk, struct mctp_sock, sk);
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struct mctp_skb_cb *cb = mctp_cb(skb);
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struct mctp_route tmp_rt;
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struct net_device *dev;
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struct mctp_hdr *hdr;
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unsigned long flags;
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unsigned int mtu;
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mctp_eid_t saddr;
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bool ext_rt;
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int rc;
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u8 tag;
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if (WARN_ON(!rt->dev))
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rc = -ENODEV;
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if (rt) {
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ext_rt = false;
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dev = NULL;
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if (WARN_ON(!rt->dev))
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goto out_release;
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} else if (cb->ifindex) {
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ext_rt = true;
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rt = &tmp_rt;
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rcu_read_lock();
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dev = dev_get_by_index_rcu(sock_net(sk), cb->ifindex);
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if (!dev) {
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rcu_read_unlock();
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return rc;
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}
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rt->dev = __mctp_dev_get(dev);
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rcu_read_unlock();
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if (!rt->dev)
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goto out_release;
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/* establish temporary route - we set up enough to keep
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* mctp_route_output happy
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*/
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rt->output = mctp_route_output;
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rt->mtu = 0;
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} else {
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return -EINVAL;
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}
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spin_lock_irqsave(&rt->dev->addrs_lock, flags);
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if (rt->dev->num_addrs == 0) {
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@ -765,18 +796,17 @@ int mctp_local_output(struct sock *sk, struct mctp_route *rt,
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spin_unlock_irqrestore(&rt->dev->addrs_lock, flags);
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if (rc)
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return rc;
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goto out_release;
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if (req_tag & MCTP_HDR_FLAG_TO) {
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rc = mctp_alloc_local_tag(msk, saddr, daddr, &tag);
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if (rc)
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return rc;
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goto out_release;
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tag |= MCTP_HDR_FLAG_TO;
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} else {
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tag = req_tag;
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}
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skb->protocol = htons(ETH_P_MCTP);
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skb->priority = 0;
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skb_reset_transport_header(skb);
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@ -796,12 +826,22 @@ int mctp_local_output(struct sock *sk, struct mctp_route *rt,
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mtu = mctp_route_mtu(rt);
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if (skb->len + sizeof(struct mctp_hdr) <= mtu) {
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hdr->flags_seq_tag = MCTP_HDR_FLAG_SOM | MCTP_HDR_FLAG_EOM |
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tag;
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return mctp_do_route(rt, skb);
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hdr->flags_seq_tag = MCTP_HDR_FLAG_SOM |
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MCTP_HDR_FLAG_EOM | tag;
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rc = rt->output(rt, skb);
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} else {
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return mctp_do_fragment_route(rt, skb, mtu, tag);
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rc = mctp_do_fragment_route(rt, skb, mtu, tag);
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}
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out_release:
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if (!ext_rt)
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mctp_route_release(rt);
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if (dev)
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dev_put(dev);
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return rc;
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}
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/* route management */
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@ -942,8 +982,15 @@ static int mctp_pkttype_receive(struct sk_buff *skb, struct net_device *dev,
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if (mh->ver < MCTP_VER_MIN || mh->ver > MCTP_VER_MAX)
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goto err_drop;
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cb = __mctp_cb(skb);
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/* MCTP drivers must populate halen/haddr */
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if (dev->type == ARPHRD_MCTP) {
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cb = mctp_cb(skb);
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} else {
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cb = __mctp_cb(skb);
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cb->halen = 0;
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}
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cb->net = READ_ONCE(mdev->net);
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cb->ifindex = dev->ifindex;
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rt = mctp_route_lookup(net, cb->net, mh->dest);
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@ -954,7 +1001,8 @@ static int mctp_pkttype_receive(struct sk_buff *skb, struct net_device *dev,
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if (!rt)
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goto err_drop;
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mctp_do_route(rt, skb);
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rt->output(rt, skb);
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mctp_route_release(rt);
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return NET_RX_SUCCESS;
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