forked from Minki/linux
1e64d7cbfd
If IPV6 was disabled, then ss command would cause a kernel warning
because the command was attempting to dump IPV6 socket information.
The fix is to just remove the warning.
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=202249
Fixes: 432490f9d4 ("net: ip, diag -- Add diag interface for raw sockets")
Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
265 lines
6.3 KiB
C
265 lines
6.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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#include <linux/module.h>
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#include <linux/inet_diag.h>
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#include <linux/sock_diag.h>
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#include <net/inet_sock.h>
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#include <net/raw.h>
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#include <net/rawv6.h>
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#ifdef pr_fmt
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# undef pr_fmt
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#endif
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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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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return ERR_PTR(-EINVAL);
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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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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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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, 0);
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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, 0);
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#endif
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return sk;
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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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if (IS_ERR(hashinfo))
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return ERR_CAST(hashinfo);
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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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goto out_unlock;
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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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return sk ? sk : ERR_PTR(-ENOENT);
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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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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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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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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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if (err < 0) {
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kfree_skb(rep);
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return err;
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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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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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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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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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if (IS_ERR(hashinfo))
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return;
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s_slot = cb->args[0];
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num = s_num = cb->args[1];
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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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sk_for_each(sk, &hashinfo->ht[slot]) {
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struct inet_sock *inet = inet_sk(sk);
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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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out_unlock:
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read_unlock(&hashinfo->lock);
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cb->args[0] = slot;
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cb->args[1] = num;
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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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#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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int err;
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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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err = sock_diag_destroy(sk, ECONNABORTED);
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sock_put(sk);
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return err;
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}
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#endif
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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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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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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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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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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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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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