[PATCH net-next 4/6] ipv4: convert do_ip_getsockopt() to sockopt_t
WARM3d
From: Breno Leitao <leitao@debian.org>
Date: 2026-09-25 15:56:15
Also in:
bpf, linux-kselftest, lkml
Subsystem:
bpf [general] (safe dynamic programs and tools), bpf [networking] (tcx & tc bpf, sock_addr), networking [general], networking [ipv4/ipv6], the rest · Maintainers:
Alexei Starovoitov, Daniel Borkmann, Andrii Nakryiko, Eduard Zingerman, Kumar Kartikeya Dwivedi, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, David Ahern, Ido Schimmel, Linus Torvalds
Convert the SOL_IP switch and ip_mroute_getsockopt(), its last leaf on a sockptr_t pair. The IP_MSFILTER and MCAST_MSFILTER bridges go away. ip_getsockopt() builds the sockopt_t with sockopt_init_user() and writes optlen back unconditionally, because IP_OPTIONS and others report a length then fail; ip_mc_msfget() therefore stores its length last. IP_PKTOPTIONS takes its buffer off iter_out. The argument is sopt, since IP_OPTIONS already has an ip_options local named opt. Validating optlen now precedes the level check and the MRT_* dispatch, so a negative optlen wins over -EOPNOTSUPP there. Signed-off-by: Breno Leitao <leitao@debian.org> --- include/linux/mroute.h | 4 +-- include/net/ip.h | 3 +- net/core/filter.c | 18 ++++++++--- net/ipv4/igmp.c | 3 +- net/ipv4/ip_sockglue.c | 87 +++++++++++++++++++------------------------------- net/ipv4/ipmr.c | 11 +++---- 6 files changed, 56 insertions(+), 70 deletions(-)
diff --git a/include/linux/mroute.h b/include/linux/mroute.h
index 4c5003afee6c51..c1c21e61c81c37 100644
--- a/include/linux/mroute.h
+++ b/include/linux/mroute.h@@ -17,7 +17,7 @@ static inline int ip_mroute_opt(int opt) } int ip_mroute_setsockopt(struct sock *, int, sockptr_t, unsigned int); -int ip_mroute_getsockopt(struct sock *, int, sockptr_t, sockptr_t); +int ip_mroute_getsockopt(struct sock *sk, int optname, sockopt_t *opt); int ipmr_ioctl(struct sock *sk, int cmd, void *arg); int ipmr_compat_ioctl(struct sock *sk, unsigned int cmd, void __user *arg); int ip_mr_init(void);
@@ -31,7 +31,7 @@ static inline int ip_mroute_setsockopt(struct sock *sock, int optname, } static inline int ip_mroute_getsockopt(struct sock *sk, int optname, - sockptr_t optval, sockptr_t optlen) + sockopt_t *opt) { return -ENOPROTOOPT; }
diff --git a/include/net/ip.h b/include/net/ip.h
index 6f602df72ee621..81aef4b98430bf 100644
--- a/include/net/ip.h
+++ b/include/net/ip.h@@ -823,8 +823,7 @@ int do_ip_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval, unsigned int optlen); int ip_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval, unsigned int optlen); -int do_ip_getsockopt(struct sock *sk, int level, int optname, - sockptr_t optval, sockptr_t optlen); +int do_ip_getsockopt(struct sock *sk, int level, int optname, sockopt_t *sopt); int ip_getsockopt(struct sock *sk, int level, int optname, char __user *optval, int __user *optlen); int ip_ra_control(struct sock *sk, unsigned char on,
diff --git a/net/core/filter.c b/net/core/filter.c
index 70dc621672f2e9..9a706ec1f7f122 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c@@ -5737,10 +5737,20 @@ static int sol_ip_sockopt(struct sock *sk, int optname, return -EINVAL; } - if (getopt) - return do_ip_getsockopt(sk, SOL_IP, optname, - KERNEL_SOCKPTR(optval), - KERNEL_SOCKPTR(optlen)); + if (getopt) { + struct kvec kvec; + sockopt_t opt; + int err; + + err = sockptr_to_sockopt(&opt, KERNEL_SOCKPTR(optval), + KERNEL_SOCKPTR(optlen), &kvec); + if (err) + return err; + + err = do_ip_getsockopt(sk, SOL_IP, optname, &opt); + *optlen = opt.optlen; + return err; + } return do_ip_setsockopt(sk, SOL_IP, optname, KERNEL_SOCKPTR(optval), *optlen);
diff --git a/net/ipv4/igmp.c b/net/ipv4/igmp.c
index d573c5bf8f038b..bf00810cdd7a13 100644
--- a/net/ipv4/igmp.c
+++ b/net/ipv4/igmp.c@@ -2763,12 +2763,13 @@ int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf, sockopt_t *opt) if (err) return err; - opt->optlen = msf_size; if (copy_to_iter(msf, IP_MSFILTER_SIZE(0), &opt->iter_out) != IP_MSFILTER_SIZE(0)) return -EFAULT; if (len && copy_to_iter(psl->sl_addr, len, &opt->iter_out) != len) return -EFAULT; + + opt->optlen = msf_size; return 0; done: return err;
diff --git a/net/ipv4/ip_sockglue.c b/net/ipv4/ip_sockglue.c
index 1f452b6ea86e9d..2e78b11d294a9f 100644
--- a/net/ipv4/ip_sockglue.c
+++ b/net/ipv4/ip_sockglue.c@@ -1509,8 +1509,7 @@ static int compat_ip_get_mcast_msfilter(struct sock *sk, sockopt_t *opt) return 0; } -int do_ip_getsockopt(struct sock *sk, int level, int optname, - sockptr_t optval, sockptr_t optlen) +int do_ip_getsockopt(struct sock *sk, int level, int optname, sockopt_t *sopt) { struct inet_sock *inet = inet_sk(sk); bool needs_rtnl = getsockopt_needs_rtnl(optname);
@@ -1521,10 +1520,9 @@ int do_ip_getsockopt(struct sock *sk, int level, int optname, return -EOPNOTSUPP; if (ip_mroute_opt(optname)) - return ip_mroute_getsockopt(sk, optname, optval, optlen); + return ip_mroute_getsockopt(sk, optname, sopt); - if (copy_from_sockptr(&len, optlen, sizeof(int))) - return -EFAULT; + len = sopt->optlen; if (len < 0) return -EINVAL;
@@ -1620,16 +1618,15 @@ int do_ip_getsockopt(struct sock *sk, int level, int optname, rcu_read_unlock(); if (opt->optlen == 0) { - len = 0; - return copy_to_sockptr(optlen, &len, sizeof(int)); + sopt->optlen = 0; + return 0; } ip_options_undo(opt); len = min_t(unsigned int, len, opt->optlen); - if (copy_to_sockptr(optlen, &len, sizeof(int))) - return -EFAULT; - if (copy_to_sockptr(optval, opt->__data, len)) + sopt->optlen = len; + if (copy_to_iter(opt->__data, len, &sopt->iter_out) != len) return -EFAULT; return 0; }
@@ -1653,12 +1650,12 @@ int do_ip_getsockopt(struct sock *sk, int level, int optname, if (sk->sk_type != SOCK_STREAM) return -ENOPROTOOPT; - if (optval.is_kernel) { + if (iov_iter_is_kvec(&sopt->iter_out)) { msg.msg_control_is_user = false; - msg.msg_control = optval.kernel; + msg.msg_control = sopt->iter_out.kvec->iov_base; } else { msg.msg_control_is_user = true; - msg.msg_control_user = optval.user; + msg.msg_control_user = sopt->iter_out.ubuf; } msg.msg_controllen = len; msg.msg_flags = in_compat_syscall() ? MSG_CMSG_COMPAT : 0;
@@ -1680,8 +1677,8 @@ int do_ip_getsockopt(struct sock *sk, int level, int optname, int tos = READ_ONCE(inet->rcv_tos); put_cmsg(&msg, SOL_IP, IP_TOS, sizeof(tos), &tos); } - len -= msg.msg_controllen; - return copy_to_sockptr(optlen, &len, sizeof(int)); + sopt->optlen = len - msg.msg_controllen; + return 0; } case IP_UNICAST_IF: val = (__force int)htonl((__u32) READ_ONCE(inet->uc_index));
@@ -1692,9 +1689,8 @@ int do_ip_getsockopt(struct sock *sk, int level, int optname, len = min_t(unsigned int, len, sizeof(struct in_addr)); addr.s_addr = READ_ONCE(inet->mc_addr); - if (copy_to_sockptr(optlen, &len, sizeof(int))) - return -EFAULT; - if (copy_to_sockptr(optval, &addr, len)) + sopt->optlen = len; + if (copy_to_iter(&addr, len, &sopt->iter_out) != len) return -EFAULT; return 0; }
@@ -1711,43 +1707,25 @@ int do_ip_getsockopt(struct sock *sk, int level, int optname, case IP_MSFILTER: { struct ip_msfilter msf; - struct kvec kvec; - sockopt_t opt; if (len < IP_MSFILTER_SIZE(0)) { err = -EINVAL; goto out; } - if (copy_from_sockptr(&msf, optval, IP_MSFILTER_SIZE(0))) { + if (copy_from_iter(&msf, IP_MSFILTER_SIZE(0), &sopt->iter_in) != + IP_MSFILTER_SIZE(0)) { err = -EFAULT; goto out; } - err = sockptr_to_sockopt(&opt, optval, optlen, &kvec); - if (err) - goto out; - - err = ip_mc_msfget(sk, &msf, &opt); - if (!err && copy_to_sockptr(optlen, &opt.optlen, sizeof(int))) - err = -EFAULT; + err = ip_mc_msfget(sk, &msf, sopt); goto out; } case MCAST_MSFILTER: - { - struct kvec kvec; - sockopt_t opt; - - err = sockptr_to_sockopt(&opt, optval, optlen, &kvec); - if (err) - goto out; - if (in_compat_syscall()) - err = compat_ip_get_mcast_msfilter(sk, &opt); + err = compat_ip_get_mcast_msfilter(sk, sopt); else - err = ip_get_mcast_msfilter(sk, &opt); - if (!err && copy_to_sockptr(optlen, &opt.optlen, sizeof(int))) - err = -EFAULT; + err = ip_get_mcast_msfilter(sk, sopt); goto out; - } case IP_PROTOCOL: val = inet_sk(sk)->inet_num; break;
@@ -1759,16 +1737,14 @@ int do_ip_getsockopt(struct sock *sk, int level, int optname, copyval: if (len < sizeof(int) && len > 0 && val >= 0 && val <= 255) { unsigned char ucval = (unsigned char)val; - len = 1; - if (copy_to_sockptr(optlen, &len, sizeof(int))) - return -EFAULT; - if (copy_to_sockptr(optval, &ucval, 1)) + + sopt->optlen = 1; + if (copy_to_iter(&ucval, 1, &sopt->iter_out) != 1) return -EFAULT; } else { len = min_t(unsigned int, sizeof(int), len); - if (copy_to_sockptr(optlen, &len, sizeof(int))) - return -EFAULT; - if (copy_to_sockptr(optval, &val, len)) + sopt->optlen = len; + if (copy_to_iter(&val, len, &sopt->iter_out) != len) return -EFAULT; } return 0;
@@ -1783,19 +1759,22 @@ int do_ip_getsockopt(struct sock *sk, int level, int optname, int ip_getsockopt(struct sock *sk, int level, int optname, char __user *optval, int __user *optlen) { + sockopt_t opt; int err; - err = do_ip_getsockopt(sk, level, optname, - USER_SOCKPTR(optval), USER_SOCKPTR(optlen)); + err = sockopt_init_user(&opt, optval, optlen); + if (err) + return err; + + err = do_ip_getsockopt(sk, level, optname, &opt); + if (put_user(opt.optlen, optlen)) + return -EFAULT; #ifdef CONFIG_NETFILTER /* we need to exclude all possible ENOPROTOOPTs except default case */ if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS && !ip_mroute_opt(optname)) { - int len; - - if (get_user(len, optlen)) - return -EFAULT; + int len = opt.optlen; err = nf_getsockopt(sk, PF_INET, optname, optval, &len); if (err >= 0)
diff --git a/net/ipv4/ipmr.c b/net/ipv4/ipmr.c
index e4c51ca473019c..f249569b4bf8b9 100644
--- a/net/ipv4/ipmr.c
+++ b/net/ipv4/ipmr.c@@ -1638,8 +1638,7 @@ int ipmr_sk_ioctl(struct sock *sk, unsigned int cmd, void __user *arg) } /* Getsock opt support for the multicast routing system. */ -int ip_mroute_getsockopt(struct sock *sk, int optname, sockptr_t optval, - sockptr_t optlen) +int ip_mroute_getsockopt(struct sock *sk, int optname, sockopt_t *opt) { int olr; int val;
@@ -1670,16 +1669,14 @@ int ip_mroute_getsockopt(struct sock *sk, int optname, sockptr_t optval, return -ENOPROTOOPT; } - if (copy_from_sockptr(&olr, optlen, sizeof(int))) - return -EFAULT; + olr = opt->optlen; if (olr < 0) return -EINVAL; olr = min_t(unsigned int, olr, sizeof(int)); - if (copy_to_sockptr(optlen, &olr, sizeof(int))) - return -EFAULT; - if (copy_to_sockptr(optval, &val, olr)) + opt->optlen = olr; + if (copy_to_iter(&val, olr, &opt->iter_out) != olr) return -EFAULT; return 0; }
--
2.53.0-Meta