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-rw-r--r--net/sctp/diag.c526
1 files changed, 526 insertions, 0 deletions
diff --git a/net/sctp/diag.c b/net/sctp/diag.c
new file mode 100644
index 0000000..a72a7d9
--- /dev/null
+++ b/net/sctp/diag.c
@@ -0,0 +1,526 @@
+#include <linux/module.h>
+#include <linux/inet_diag.h>
+#include <linux/sock_diag.h>
+#include <net/sctp/sctp.h>
+
+static void sctp_diag_get_info(struct sock *sk, struct inet_diag_msg *r,
+ void *info);
+
+/* define some functions to make asoc/ep fill look clean */
+static void inet_diag_msg_sctpasoc_fill(struct inet_diag_msg *r,
+ struct sock *sk,
+ struct sctp_association *asoc)
+{
+ union sctp_addr laddr, paddr;
+ struct dst_entry *dst;
+ struct timer_list *t3_rtx = &asoc->peer.primary_path->T3_rtx_timer;
+
+ laddr = list_entry(asoc->base.bind_addr.address_list.next,
+ struct sctp_sockaddr_entry, list)->a;
+ paddr = asoc->peer.primary_path->ipaddr;
+ dst = asoc->peer.primary_path->dst;
+
+ r->idiag_family = sk->sk_family;
+ r->id.idiag_sport = htons(asoc->base.bind_addr.port);
+ r->id.idiag_dport = htons(asoc->peer.port);
+ r->id.idiag_if = dst ? dst->dev->ifindex : 0;
+ sock_diag_save_cookie(sk, r->id.idiag_cookie);
+
+#if IS_ENABLED(CONFIG_IPV6)
+ if (sk->sk_family == AF_INET6) {
+ *(struct in6_addr *)r->id.idiag_src = laddr.v6.sin6_addr;
+ *(struct in6_addr *)r->id.idiag_dst = paddr.v6.sin6_addr;
+ } else
+#endif
+ {
+ memset(&r->id.idiag_src, 0, sizeof(r->id.idiag_src));
+ memset(&r->id.idiag_dst, 0, sizeof(r->id.idiag_dst));
+
+ r->id.idiag_src[0] = laddr.v4.sin_addr.s_addr;
+ r->id.idiag_dst[0] = paddr.v4.sin_addr.s_addr;
+ }
+
+ r->idiag_state = asoc->state;
+ if (timer_pending(t3_rtx)) {
+ r->idiag_timer = SCTP_EVENT_TIMEOUT_T3_RTX;
+ r->idiag_retrans = asoc->rtx_data_chunks;
+ r->idiag_expires = jiffies_to_msecs(t3_rtx->expires - jiffies);
+ } else {
+ r->idiag_timer = 0;
+ r->idiag_retrans = 0;
+ r->idiag_expires = 0;
+ }
+}
+
+static int inet_diag_msg_sctpladdrs_fill(struct sk_buff *skb,
+ struct list_head *address_list)
+{
+ struct sctp_sockaddr_entry *laddr;
+ int addrlen = sizeof(struct sockaddr_storage);
+ int addrcnt = 0;
+ struct nlattr *attr;
+ void *info = NULL;
+
+ list_for_each_entry_rcu(laddr, address_list, list)
+ addrcnt++;
+
+ attr = nla_reserve(skb, INET_DIAG_LOCALS, addrlen * addrcnt);
+ if (!attr)
+ return -EMSGSIZE;
+
+ info = nla_data(attr);
+ list_for_each_entry_rcu(laddr, address_list, list) {
+ memcpy(info, &laddr->a, sizeof(laddr->a));
+ memset(info + sizeof(laddr->a), 0, addrlen - sizeof(laddr->a));
+ info += addrlen;
+ }
+
+ return 0;
+}
+
+static int inet_diag_msg_sctpaddrs_fill(struct sk_buff *skb,
+ struct sctp_association *asoc)
+{
+ int addrlen = sizeof(struct sockaddr_storage);
+ struct sctp_transport *from;
+ struct nlattr *attr;
+ void *info = NULL;
+
+ attr = nla_reserve(skb, INET_DIAG_PEERS,
+ addrlen * asoc->peer.transport_count);
+ if (!attr)
+ return -EMSGSIZE;
+
+ info = nla_data(attr);
+ list_for_each_entry(from, &asoc->peer.transport_addr_list,
+ transports) {
+ memcpy(info, &from->ipaddr, sizeof(from->ipaddr));
+ memset(info + sizeof(from->ipaddr), 0,
+ addrlen - sizeof(from->ipaddr));
+ info += addrlen;
+ }
+
+ return 0;
+}
+
+/* sctp asoc/ep fill*/
+static int inet_sctp_diag_fill(struct sock *sk, struct sctp_association *asoc,
+ struct sk_buff *skb,
+ const struct inet_diag_req_v2 *req,
+ struct user_namespace *user_ns,
+ int portid, u32 seq, u16 nlmsg_flags,
+ const struct nlmsghdr *unlh,
+ bool net_admin)
+{
+ struct sctp_endpoint *ep = sctp_sk(sk)->ep;
+ struct list_head *addr_list;
+ struct inet_diag_msg *r;
+ struct nlmsghdr *nlh;
+ int ext = req->idiag_ext;
+ struct sctp_infox infox;
+ void *info = NULL;
+
+ nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
+ nlmsg_flags);
+ if (!nlh)
+ return -EMSGSIZE;
+
+ r = nlmsg_data(nlh);
+ BUG_ON(!sk_fullsock(sk));
+
+ if (asoc) {
+ inet_diag_msg_sctpasoc_fill(r, sk, asoc);
+ } else {
+ inet_diag_msg_common_fill(r, sk);
+ r->idiag_state = sk->sk_state;
+ r->idiag_timer = 0;
+ r->idiag_retrans = 0;
+ }
+
+ if (inet_diag_msg_attrs_fill(sk, skb, r, ext, user_ns, net_admin))
+ goto errout;
+
+ if (ext & (1 << (INET_DIAG_SKMEMINFO - 1))) {
+ u32 mem[SK_MEMINFO_VARS];
+ int amt;
+
+ if (asoc && asoc->ep->sndbuf_policy)
+ amt = asoc->sndbuf_used;
+ else
+ amt = sk_wmem_alloc_get(sk);
+ mem[SK_MEMINFO_WMEM_ALLOC] = amt;
+ if (asoc && asoc->ep->rcvbuf_policy)
+ amt = atomic_read(&asoc->rmem_alloc);
+ else
+ amt = sk_rmem_alloc_get(sk);
+ mem[SK_MEMINFO_RMEM_ALLOC] = amt;
+ mem[SK_MEMINFO_RCVBUF] = sk->sk_rcvbuf;
+ mem[SK_MEMINFO_SNDBUF] = sk->sk_sndbuf;
+ mem[SK_MEMINFO_FWD_ALLOC] = sk->sk_forward_alloc;
+ mem[SK_MEMINFO_WMEM_QUEUED] = sk->sk_wmem_queued;
+ mem[SK_MEMINFO_OPTMEM] = atomic_read(&sk->sk_omem_alloc);
+ mem[SK_MEMINFO_BACKLOG] = sk->sk_backlog.len;
+ mem[SK_MEMINFO_DROPS] = atomic_read(&sk->sk_drops);
+
+ if (nla_put(skb, INET_DIAG_SKMEMINFO, sizeof(mem), &mem) < 0)
+ goto errout;
+ }
+
+ if (ext & (1 << (INET_DIAG_INFO - 1))) {
+ struct nlattr *attr;
+
+ attr = nla_reserve_64bit(skb, INET_DIAG_INFO,
+ sizeof(struct sctp_info),
+ INET_DIAG_PAD);
+ if (!attr)
+ goto errout;
+
+ info = nla_data(attr);
+ }
+ infox.sctpinfo = (struct sctp_info *)info;
+ infox.asoc = asoc;
+ sctp_diag_get_info(sk, r, &infox);
+
+ addr_list = asoc ? &asoc->base.bind_addr.address_list
+ : &ep->base.bind_addr.address_list;
+ if (inet_diag_msg_sctpladdrs_fill(skb, addr_list))
+ goto errout;
+
+ if (asoc && (ext & (1 << (INET_DIAG_CONG - 1))))
+ if (nla_put_string(skb, INET_DIAG_CONG, "reno") < 0)
+ goto errout;
+
+ if (asoc && inet_diag_msg_sctpaddrs_fill(skb, asoc))
+ goto errout;
+
+ nlmsg_end(skb, nlh);
+ return 0;
+
+errout:
+ nlmsg_cancel(skb, nlh);
+ return -EMSGSIZE;
+}
+
+/* callback and param */
+struct sctp_comm_param {
+ struct sk_buff *skb;
+ struct netlink_callback *cb;
+ const struct inet_diag_req_v2 *r;
+ const struct nlmsghdr *nlh;
+ bool net_admin;
+};
+
+static size_t inet_assoc_attr_size(struct sctp_association *asoc)
+{
+ int addrlen = sizeof(struct sockaddr_storage);
+ int addrcnt = 0;
+ struct sctp_sockaddr_entry *laddr;
+
+ list_for_each_entry_rcu(laddr, &asoc->base.bind_addr.address_list,
+ list)
+ addrcnt++;
+
+ return nla_total_size(sizeof(struct sctp_info))
+ + nla_total_size(1) /* INET_DIAG_SHUTDOWN */
+ + nla_total_size(1) /* INET_DIAG_TOS */
+ + nla_total_size(1) /* INET_DIAG_TCLASS */
+ + nla_total_size(4) /* INET_DIAG_MARK */
+ + nla_total_size(addrlen * asoc->peer.transport_count)
+ + nla_total_size(addrlen * addrcnt)
+ + nla_total_size(sizeof(struct inet_diag_meminfo))
+ + nla_total_size(sizeof(struct inet_diag_msg))
+ + 64;
+}
+
+static int sctp_tsp_dump_one(struct sctp_transport *tsp, void *p)
+{
+ struct sctp_association *assoc = tsp->asoc;
+ struct sock *sk = tsp->asoc->base.sk;
+ struct sctp_comm_param *commp = p;
+ struct sk_buff *in_skb = commp->skb;
+ const struct inet_diag_req_v2 *req = commp->r;
+ const struct nlmsghdr *nlh = commp->nlh;
+ struct net *net = sock_net(in_skb->sk);
+ struct sk_buff *rep;
+ int err;
+
+ err = sock_diag_check_cookie(sk, req->id.idiag_cookie);
+ if (err)
+ goto out;
+
+ err = -ENOMEM;
+ rep = nlmsg_new(inet_assoc_attr_size(assoc), GFP_KERNEL);
+ if (!rep)
+ goto out;
+
+ lock_sock(sk);
+ if (sk != assoc->base.sk) {
+ release_sock(sk);
+ sk = assoc->base.sk;
+ lock_sock(sk);
+ }
+ err = inet_sctp_diag_fill(sk, assoc, rep, req,
+ sk_user_ns(NETLINK_CB(in_skb).sk),
+ NETLINK_CB(in_skb).portid,
+ nlh->nlmsg_seq, 0, nlh,
+ commp->net_admin);
+ release_sock(sk);
+ if (err < 0) {
+ WARN_ON(err == -EMSGSIZE);
+ kfree_skb(rep);
+ goto out;
+ }
+
+ err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid,
+ MSG_DONTWAIT);
+ if (err > 0)
+ err = 0;
+out:
+ return err;
+}
+
+static int sctp_sock_dump(struct sctp_transport *tsp, void *p)
+{
+ struct sctp_endpoint *ep = tsp->asoc->ep;
+ struct sctp_comm_param *commp = p;
+ struct sock *sk = ep->base.sk;
+ struct sk_buff *skb = commp->skb;
+ struct netlink_callback *cb = commp->cb;
+ const struct inet_diag_req_v2 *r = commp->r;
+ struct sctp_association *assoc;
+ int err = 0;
+
+ lock_sock(sk);
+ list_for_each_entry(assoc, &ep->asocs, asocs) {
+ if (cb->args[4] < cb->args[1])
+ goto next;
+
+ if (r->id.idiag_sport != htons(assoc->base.bind_addr.port) &&
+ r->id.idiag_sport)
+ goto next;
+ if (r->id.idiag_dport != htons(assoc->peer.port) &&
+ r->id.idiag_dport)
+ goto next;
+
+ if (!cb->args[3] &&
+ inet_sctp_diag_fill(sk, NULL, skb, r,
+ sk_user_ns(NETLINK_CB(cb->skb).sk),
+ NETLINK_CB(cb->skb).portid,
+ cb->nlh->nlmsg_seq,
+ NLM_F_MULTI, cb->nlh,
+ commp->net_admin) < 0) {
+ err = 1;
+ goto release;
+ }
+ cb->args[3] = 1;
+
+ if (inet_sctp_diag_fill(sk, assoc, skb, r,
+ sk_user_ns(NETLINK_CB(cb->skb).sk),
+ NETLINK_CB(cb->skb).portid,
+ cb->nlh->nlmsg_seq, 0, cb->nlh,
+ commp->net_admin) < 0) {
+ err = 1;
+ goto release;
+ }
+next:
+ cb->args[4]++;
+ }
+ cb->args[1] = 0;
+ cb->args[3] = 0;
+ cb->args[4] = 0;
+release:
+ release_sock(sk);
+ return err;
+}
+
+static int sctp_sock_filter(struct sctp_transport *tsp, void *p)
+{
+ struct sctp_endpoint *ep = tsp->asoc->ep;
+ struct sctp_comm_param *commp = p;
+ struct sock *sk = ep->base.sk;
+ const struct inet_diag_req_v2 *r = commp->r;
+ struct sctp_association *assoc =
+ list_entry(ep->asocs.next, struct sctp_association, asocs);
+
+ /* find the ep only once through the transports by this condition */
+ if (tsp->asoc != assoc)
+ return 0;
+
+ if (r->sdiag_family != AF_UNSPEC && sk->sk_family != r->sdiag_family)
+ return 0;
+
+ return 1;
+}
+
+static int sctp_ep_dump(struct sctp_endpoint *ep, void *p)
+{
+ struct sctp_comm_param *commp = p;
+ struct sock *sk = ep->base.sk;
+ struct sk_buff *skb = commp->skb;
+ struct netlink_callback *cb = commp->cb;
+ const struct inet_diag_req_v2 *r = commp->r;
+ struct net *net = sock_net(skb->sk);
+ struct inet_sock *inet = inet_sk(sk);
+ int err = 0;
+
+ if (!net_eq(sock_net(sk), net))
+ goto out;
+
+ if (cb->args[4] < cb->args[1])
+ goto next;
+
+ if (!(r->idiag_states & TCPF_LISTEN) && !list_empty(&ep->asocs))
+ goto next;
+
+ if (r->sdiag_family != AF_UNSPEC &&
+ sk->sk_family != r->sdiag_family)
+ goto next;
+
+ if (r->id.idiag_sport != inet->inet_sport &&
+ r->id.idiag_sport)
+ goto next;
+
+ if (r->id.idiag_dport != inet->inet_dport &&
+ r->id.idiag_dport)
+ goto next;
+
+ if (inet_sctp_diag_fill(sk, NULL, skb, r,
+ sk_user_ns(NETLINK_CB(cb->skb).sk),
+ NETLINK_CB(cb->skb).portid,
+ cb->nlh->nlmsg_seq, NLM_F_MULTI,
+ cb->nlh, commp->net_admin) < 0) {
+ err = 2;
+ goto out;
+ }
+next:
+ cb->args[4]++;
+out:
+ return err;
+}
+
+/* define the functions for sctp_diag_handler*/
+static void sctp_diag_get_info(struct sock *sk, struct inet_diag_msg *r,
+ void *info)
+{
+ struct sctp_infox *infox = (struct sctp_infox *)info;
+
+ if (infox->asoc) {
+ r->idiag_rqueue = atomic_read(&infox->asoc->rmem_alloc);
+ r->idiag_wqueue = infox->asoc->sndbuf_used;
+ } else {
+ r->idiag_rqueue = sk->sk_ack_backlog;
+ r->idiag_wqueue = sk->sk_max_ack_backlog;
+ }
+ if (infox->sctpinfo)
+ sctp_get_sctp_info(sk, infox->asoc, infox->sctpinfo);
+}
+
+static int sctp_diag_dump_one(struct sk_buff *in_skb,
+ const struct nlmsghdr *nlh,
+ const struct inet_diag_req_v2 *req)
+{
+ struct net *net = sock_net(in_skb->sk);
+ union sctp_addr laddr, paddr;
+ struct sctp_comm_param commp = {
+ .skb = in_skb,
+ .r = req,
+ .nlh = nlh,
+ .net_admin = netlink_net_capable(in_skb, CAP_NET_ADMIN),
+ };
+
+ if (req->sdiag_family == AF_INET) {
+ laddr.v4.sin_port = req->id.idiag_sport;
+ laddr.v4.sin_addr.s_addr = req->id.idiag_src[0];
+ laddr.v4.sin_family = AF_INET;
+
+ paddr.v4.sin_port = req->id.idiag_dport;
+ paddr.v4.sin_addr.s_addr = req->id.idiag_dst[0];
+ paddr.v4.sin_family = AF_INET;
+ } else {
+ laddr.v6.sin6_port = req->id.idiag_sport;
+ memcpy(&laddr.v6.sin6_addr, req->id.idiag_src,
+ sizeof(laddr.v6.sin6_addr));
+ laddr.v6.sin6_family = AF_INET6;
+
+ paddr.v6.sin6_port = req->id.idiag_dport;
+ memcpy(&paddr.v6.sin6_addr, req->id.idiag_dst,
+ sizeof(paddr.v6.sin6_addr));
+ paddr.v6.sin6_family = AF_INET6;
+ }
+
+ return sctp_transport_lookup_process(sctp_tsp_dump_one,
+ net, &laddr, &paddr, &commp);
+}
+
+static void sctp_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
+ const struct inet_diag_req_v2 *r, struct nlattr *bc)
+{
+ u32 idiag_states = r->idiag_states;
+ struct net *net = sock_net(skb->sk);
+ struct sctp_comm_param commp = {
+ .skb = skb,
+ .cb = cb,
+ .r = r,
+ .net_admin = netlink_net_capable(cb->skb, CAP_NET_ADMIN),
+ };
+ int pos = cb->args[2];
+
+ /* eps hashtable dumps
+ * args:
+ * 0 : if it will traversal listen sock
+ * 1 : to record the sock pos of this time's traversal
+ * 4 : to work as a temporary variable to traversal list
+ */
+ if (cb->args[0] == 0) {
+ if (!(idiag_states & TCPF_LISTEN))
+ goto skip;
+ if (sctp_for_each_endpoint(sctp_ep_dump, &commp))
+ goto done;
+skip:
+ cb->args[0] = 1;
+ cb->args[1] = 0;
+ cb->args[4] = 0;
+ }
+
+ /* asocs by transport hashtable dump
+ * args:
+ * 1 : to record the assoc pos of this time's traversal
+ * 2 : to record the transport pos of this time's traversal
+ * 3 : to mark if we have dumped the ep info of the current asoc
+ * 4 : to work as a temporary variable to traversal list
+ * 5 : to save the sk we get from travelsing the tsp list.
+ */
+ if (!(idiag_states & ~(TCPF_LISTEN | TCPF_CLOSE)))
+ goto done;
+
+ sctp_for_each_transport(sctp_sock_filter, sctp_sock_dump,
+ net, &pos, &commp);
+ cb->args[2] = pos;
+
+done:
+ cb->args[1] = cb->args[4];
+ cb->args[4] = 0;
+}
+
+static const struct inet_diag_handler sctp_diag_handler = {
+ .dump = sctp_diag_dump,
+ .dump_one = sctp_diag_dump_one,
+ .idiag_get_info = sctp_diag_get_info,
+ .idiag_type = IPPROTO_SCTP,
+ .idiag_info_size = sizeof(struct sctp_info),
+};
+
+static int __init sctp_diag_init(void)
+{
+ return inet_diag_register(&sctp_diag_handler);
+}
+
+static void __exit sctp_diag_exit(void)
+{
+ inet_diag_unregister(&sctp_diag_handler);
+}
+
+module_init(sctp_diag_init);
+module_exit(sctp_diag_exit);
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2-132);
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