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@@ -0,0 +1,261 @@
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+#include <linux/module.h>
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+
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+#include <linux/inet_diag.h>
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+#include <linux/sock_diag.h>
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+
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+#include <net/raw.h>
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+#include <net/rawv6.h>
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+
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+#ifdef pr_fmt
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+# undef pr_fmt
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+#endif
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+
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+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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+
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+static struct raw_hashinfo *
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+raw_get_hashinfo(const struct inet_diag_req_v2 *r)
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+{
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+ if (r->sdiag_family == AF_INET) {
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+ return &raw_v4_hashinfo;
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+#if IS_ENABLED(CONFIG_IPV6)
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+ } else if (r->sdiag_family == AF_INET6) {
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+ return &raw_v6_hashinfo;
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+#endif
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+ } else {
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+ pr_warn_once("Unexpected inet family %d\n",
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+ r->sdiag_family);
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+ WARN_ON_ONCE(1);
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+ return ERR_PTR(-EINVAL);
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+ }
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+}
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+
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+/*
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+ * Due to requirement of not breaking user API we can't simply
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+ * rename @pad field in inet_diag_req_v2 structure, instead
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+ * use helper to figure it out.
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+ */
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+
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+static struct sock *raw_lookup(struct net *net, struct sock *from,
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+ const struct inet_diag_req_v2 *req)
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+{
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+ struct inet_diag_req_raw *r = (void *)req;
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+ struct sock *sk = NULL;
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+
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+ if (r->sdiag_family == AF_INET)
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+ sk = __raw_v4_lookup(net, from, r->sdiag_raw_protocol,
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+ r->id.idiag_dst[0],
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+ r->id.idiag_src[0],
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+ r->id.idiag_if);
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+#if IS_ENABLED(CONFIG_IPV6)
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+ else
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+ sk = __raw_v6_lookup(net, from, r->sdiag_raw_protocol,
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+ (const struct in6_addr *)r->id.idiag_src,
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+ (const struct in6_addr *)r->id.idiag_dst,
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+ r->id.idiag_if);
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+#endif
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+ return sk;
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+}
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+
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+static struct sock *raw_sock_get(struct net *net, const struct inet_diag_req_v2 *r)
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+{
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+ struct raw_hashinfo *hashinfo = raw_get_hashinfo(r);
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+ struct sock *sk = NULL, *s;
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+ int slot;
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+
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+ if (IS_ERR(hashinfo))
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+ return ERR_CAST(hashinfo);
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+
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+ read_lock(&hashinfo->lock);
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+ for (slot = 0; slot < RAW_HTABLE_SIZE; slot++) {
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+ sk_for_each(s, &hashinfo->ht[slot]) {
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+ sk = raw_lookup(net, s, r);
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+ if (sk) {
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+ /*
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+ * Grab it and keep until we fill
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+ * diag meaage to be reported, so
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+ * caller should call sock_put then.
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+ * We can do that because we're keeping
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+ * hashinfo->lock here.
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+ */
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+ sock_hold(sk);
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+ break;
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+ }
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+ }
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+ }
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+ read_unlock(&hashinfo->lock);
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+
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+ return sk ? sk : ERR_PTR(-ENOENT);
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+}
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+
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+static int raw_diag_dump_one(struct sk_buff *in_skb,
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+ const struct nlmsghdr *nlh,
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+ const struct inet_diag_req_v2 *r)
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+{
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+ struct net *net = sock_net(in_skb->sk);
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+ struct sk_buff *rep;
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+ struct sock *sk;
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+ int err;
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+
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+ sk = raw_sock_get(net, r);
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+ if (IS_ERR(sk))
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+ return PTR_ERR(sk);
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+
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+ rep = nlmsg_new(sizeof(struct inet_diag_msg) +
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+ sizeof(struct inet_diag_meminfo) + 64,
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+ GFP_KERNEL);
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+ if (!rep) {
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+ sock_put(sk);
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+ return -ENOMEM;
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+ }
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+
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+ err = inet_sk_diag_fill(sk, NULL, rep, r,
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+ sk_user_ns(NETLINK_CB(in_skb).sk),
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+ NETLINK_CB(in_skb).portid,
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+ nlh->nlmsg_seq, 0, nlh,
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+ netlink_net_capable(in_skb, CAP_NET_ADMIN));
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+ sock_put(sk);
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+
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+ if (err < 0) {
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+ kfree_skb(rep);
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+ return err;
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+ }
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+
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+ err = netlink_unicast(net->diag_nlsk, rep,
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+ NETLINK_CB(in_skb).portid,
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+ MSG_DONTWAIT);
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+ if (err > 0)
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+ err = 0;
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+ return err;
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+}
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+
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+static int sk_diag_dump(struct sock *sk, struct sk_buff *skb,
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+ struct netlink_callback *cb,
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+ const struct inet_diag_req_v2 *r,
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+ struct nlattr *bc, bool net_admin)
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+{
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+ if (!inet_diag_bc_sk(bc, sk))
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+ return 0;
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+
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+ return inet_sk_diag_fill(sk, NULL, skb, r,
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+ sk_user_ns(NETLINK_CB(cb->skb).sk),
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+ NETLINK_CB(cb->skb).portid,
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+ cb->nlh->nlmsg_seq, NLM_F_MULTI,
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+ cb->nlh, net_admin);
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+}
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+
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+static void raw_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
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+ const struct inet_diag_req_v2 *r, struct nlattr *bc)
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+{
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+ bool net_admin = netlink_net_capable(cb->skb, CAP_NET_ADMIN);
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+ struct raw_hashinfo *hashinfo = raw_get_hashinfo(r);
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+ struct net *net = sock_net(skb->sk);
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+ int num, s_num, slot, s_slot;
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+ struct sock *sk = NULL;
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+
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+ if (IS_ERR(hashinfo))
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+ return;
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+
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+ s_slot = cb->args[0];
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+ num = s_num = cb->args[1];
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+
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+ read_lock(&hashinfo->lock);
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+ for (slot = s_slot; slot < RAW_HTABLE_SIZE; s_num = 0, slot++) {
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+ num = 0;
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+
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+ sk_for_each(sk, &hashinfo->ht[slot]) {
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+ struct inet_sock *inet = inet_sk(sk);
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+
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+ if (!net_eq(sock_net(sk), net))
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+ continue;
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+ if (num < s_num)
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+ goto next;
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+ if (sk->sk_family != r->sdiag_family)
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+ goto next;
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+ if (r->id.idiag_sport != inet->inet_sport &&
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+ r->id.idiag_sport)
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+ goto next;
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+ if (r->id.idiag_dport != inet->inet_dport &&
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+ r->id.idiag_dport)
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+ goto next;
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+ if (sk_diag_dump(sk, skb, cb, r, bc, net_admin) < 0)
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+ goto out_unlock;
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+next:
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+ num++;
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+ }
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+ }
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+
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+out_unlock:
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+ read_unlock(&hashinfo->lock);
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+
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+ cb->args[0] = slot;
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+ cb->args[1] = num;
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+}
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+
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+static void raw_diag_get_info(struct sock *sk, struct inet_diag_msg *r,
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+ void *info)
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+{
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+ r->idiag_rqueue = sk_rmem_alloc_get(sk);
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+ r->idiag_wqueue = sk_wmem_alloc_get(sk);
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+}
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+
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+#ifdef CONFIG_INET_DIAG_DESTROY
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+static int raw_diag_destroy(struct sk_buff *in_skb,
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+ const struct inet_diag_req_v2 *r)
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+{
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+ struct net *net = sock_net(in_skb->sk);
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+ struct sock *sk;
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+
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+ sk = raw_sock_get(net, r);
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+ if (IS_ERR(sk))
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+ return PTR_ERR(sk);
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+ return sock_diag_destroy(sk, ECONNABORTED);
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+}
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+#endif
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+
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+static const struct inet_diag_handler raw_diag_handler = {
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+ .dump = raw_diag_dump,
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+ .dump_one = raw_diag_dump_one,
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+ .idiag_get_info = raw_diag_get_info,
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+ .idiag_type = IPPROTO_RAW,
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+ .idiag_info_size = 0,
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+#ifdef CONFIG_INET_DIAG_DESTROY
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+ .destroy = raw_diag_destroy,
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+#endif
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+};
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+
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+static void __always_unused __check_inet_diag_req_raw(void)
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+{
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+ /*
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+ * Make sure the two structures are identical,
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+ * except the @pad field.
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+ */
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+#define __offset_mismatch(m1, m2) \
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+ (offsetof(struct inet_diag_req_v2, m1) != \
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+ offsetof(struct inet_diag_req_raw, m2))
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+
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+ BUILD_BUG_ON(sizeof(struct inet_diag_req_v2) !=
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+ sizeof(struct inet_diag_req_raw));
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+ BUILD_BUG_ON(__offset_mismatch(sdiag_family, sdiag_family));
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+ BUILD_BUG_ON(__offset_mismatch(sdiag_protocol, sdiag_protocol));
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+ BUILD_BUG_ON(__offset_mismatch(idiag_ext, idiag_ext));
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+ BUILD_BUG_ON(__offset_mismatch(pad, sdiag_raw_protocol));
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+ BUILD_BUG_ON(__offset_mismatch(idiag_states, idiag_states));
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+ BUILD_BUG_ON(__offset_mismatch(id, id));
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+#undef __offset_mismatch
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+}
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+
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+static int __init raw_diag_init(void)
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+{
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+ return inet_diag_register(&raw_diag_handler);
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+}
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+
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+static void __exit raw_diag_exit(void)
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+{
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+ inet_diag_unregister(&raw_diag_handler);
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+}
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+
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+module_init(raw_diag_init);
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+module_exit(raw_diag_exit);
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+MODULE_LICENSE("GPL");
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+MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2-255 /* AF_INET - IPPROTO_RAW */);
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+MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 10-255 /* AF_INET6 - IPPROTO_RAW */);
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Cyrill Gorcunov