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Message-Id: <20200723060908.50081-21-hch@lst.de>
Date: Thu, 23 Jul 2020 08:09:02 +0200
From: Christoph Hellwig <hch@....de>
To: "David S. Miller" <davem@...emloft.net>,
Jakub Kicinski <kuba@...nel.org>,
Alexei Starovoitov <ast@...nel.org>,
Daniel Borkmann <daniel@...earbox.net>,
Alexey Kuznetsov <kuznet@....inr.ac.ru>,
Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
Eric Dumazet <edumazet@...gle.com>
Cc: linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org,
netdev@...r.kernel.org, bpf@...r.kernel.org,
netfilter-devel@...r.kernel.org, coreteam@...filter.org,
linux-sctp@...r.kernel.org, linux-hams@...r.kernel.org,
linux-bluetooth@...r.kernel.org, bridge@...ts.linux-foundation.org,
linux-can@...r.kernel.org, dccp@...r.kernel.org,
linux-decnet-user@...ts.sourceforge.net,
linux-wpan@...r.kernel.org, linux-s390@...r.kernel.org,
mptcp@...ts.01.org, lvs-devel@...r.kernel.org,
rds-devel@....oracle.com, linux-afs@...ts.infradead.org,
tipc-discussion@...ts.sourceforge.net, linux-x25@...r.kernel.org
Subject: [PATCH 20/26] net/ipv6: factor out a ipv6_set_opt_hdr helper
Factour out a helper to set the IPv6 option headers from
do_ipv6_setsockopt.
Signed-off-by: Christoph Hellwig <hch@....de>
---
net/ipv6/ipv6_sockglue.c | 150 +++++++++++++++++++--------------------
1 file changed, 75 insertions(+), 75 deletions(-)
diff --git a/net/ipv6/ipv6_sockglue.c b/net/ipv6/ipv6_sockglue.c
index 3897fb55372d38..90442c8366dff2 100644
--- a/net/ipv6/ipv6_sockglue.c
+++ b/net/ipv6/ipv6_sockglue.c
@@ -315,6 +315,80 @@ static int compat_ipv6_mcast_join_leave(struct sock *sk, int optname,
return ipv6_sock_mc_drop(sk, gr32.gr_interface, &psin6->sin6_addr);
}
+static int ipv6_set_opt_hdr(struct sock *sk, int optname, void __user *optval,
+ int optlen)
+{
+ struct ipv6_pinfo *np = inet6_sk(sk);
+ struct ipv6_opt_hdr *new = NULL;
+ struct net *net = sock_net(sk);
+ struct ipv6_txoptions *opt;
+ int err;
+
+ /* hop-by-hop / destination options are privileged option */
+ if (optname != IPV6_RTHDR && !ns_capable(net->user_ns, CAP_NET_RAW))
+ return -EPERM;
+
+ /* remove any sticky options header with a zero option
+ * length, per RFC3542.
+ */
+ if (optlen > 0) {
+ if (!optval)
+ return -EINVAL;
+ if (optlen < sizeof(struct ipv6_opt_hdr) ||
+ optlen & 0x7 ||
+ optlen > 8 * 255)
+ return -EINVAL;
+
+ new = memdup_user(optval, optlen);
+ if (IS_ERR(new))
+ return PTR_ERR(new);
+ if (unlikely(ipv6_optlen(new) > optlen)) {
+ kfree(new);
+ return -EINVAL;
+ }
+ }
+
+ opt = rcu_dereference_protected(np->opt, lockdep_sock_is_held(sk));
+ opt = ipv6_renew_options(sk, opt, optname, new);
+ kfree(new);
+ if (IS_ERR(opt))
+ return PTR_ERR(opt);
+
+ /* routing header option needs extra check */
+ err = -EINVAL;
+ if (optname == IPV6_RTHDR && opt && opt->srcrt) {
+ struct ipv6_rt_hdr *rthdr = opt->srcrt;
+ switch (rthdr->type) {
+#if IS_ENABLED(CONFIG_IPV6_MIP6)
+ case IPV6_SRCRT_TYPE_2:
+ if (rthdr->hdrlen != 2 || rthdr->segments_left != 1)
+ goto sticky_done;
+ break;
+#endif
+ case IPV6_SRCRT_TYPE_4:
+ {
+ struct ipv6_sr_hdr *srh =
+ (struct ipv6_sr_hdr *)opt->srcrt;
+
+ if (!seg6_validate_srh(srh, optlen, false))
+ goto sticky_done;
+ break;
+ }
+ default:
+ goto sticky_done;
+ }
+ }
+
+ err = 0;
+ opt = ipv6_update_options(sk, opt);
+sticky_done:
+ if (opt) {
+ atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
+ txopt_put(opt);
+ }
+ return err;
+}
+
static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
char __user *optval, unsigned int optlen)
{
@@ -580,82 +654,8 @@ static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
case IPV6_RTHDRDSTOPTS:
case IPV6_RTHDR:
case IPV6_DSTOPTS:
- {
- struct ipv6_txoptions *opt;
- struct ipv6_opt_hdr *new = NULL;
-
- /* hop-by-hop / destination options are privileged option */
- retv = -EPERM;
- if (optname != IPV6_RTHDR && !ns_capable(net->user_ns, CAP_NET_RAW))
- break;
-
- /* remove any sticky options header with a zero option
- * length, per RFC3542.
- */
- if (optlen == 0)
- optval = NULL;
- else if (!optval)
- goto e_inval;
- else if (optlen < sizeof(struct ipv6_opt_hdr) ||
- optlen & 0x7 || optlen > 8 * 255)
- goto e_inval;
- else {
- new = memdup_user(optval, optlen);
- if (IS_ERR(new)) {
- retv = PTR_ERR(new);
- break;
- }
- if (unlikely(ipv6_optlen(new) > optlen)) {
- kfree(new);
- goto e_inval;
- }
- }
-
- opt = rcu_dereference_protected(np->opt,
- lockdep_sock_is_held(sk));
- opt = ipv6_renew_options(sk, opt, optname, new);
- kfree(new);
- if (IS_ERR(opt)) {
- retv = PTR_ERR(opt);
- break;
- }
-
- /* routing header option needs extra check */
- retv = -EINVAL;
- if (optname == IPV6_RTHDR && opt && opt->srcrt) {
- struct ipv6_rt_hdr *rthdr = opt->srcrt;
- switch (rthdr->type) {
-#if IS_ENABLED(CONFIG_IPV6_MIP6)
- case IPV6_SRCRT_TYPE_2:
- if (rthdr->hdrlen != 2 ||
- rthdr->segments_left != 1)
- goto sticky_done;
-
- break;
-#endif
- case IPV6_SRCRT_TYPE_4:
- {
- struct ipv6_sr_hdr *srh = (struct ipv6_sr_hdr *)
- opt->srcrt;
-
- if (!seg6_validate_srh(srh, optlen, false))
- goto sticky_done;
- break;
- }
- default:
- goto sticky_done;
- }
- }
-
- retv = 0;
- opt = ipv6_update_options(sk, opt);
-sticky_done:
- if (opt) {
- atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
- txopt_put(opt);
- }
+ retv = ipv6_set_opt_hdr(sk, optname, optval, optlen);
break;
- }
case IPV6_PKTINFO:
{
--
2.27.0
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