diff options
author | Martin KaFai Lau <martin.lau@kernel.org> | 2022-09-01 17:28:53 -0700 |
---|---|---|
committer | Alexei Starovoitov <ast@kernel.org> | 2022-09-02 20:34:31 -0700 |
commit | 6dadbe4bac68309eb46ab0f30e8ff47a789df49a (patch) | |
tree | 9bc4341200aac48e114bda425e8afeda531cbab3 /net/ipv6/ipv6_sockglue.c | |
parent | 9c3f9707decd67e48fc600f6e4adcdab3fe0878d (diff) |
bpf: net: Change do_ipv6_getsockopt() to take the sockptr_t argument
Similar to the earlier patch that changes sk_getsockopt() to
take the sockptr_t argument . This patch also changes
do_ipv6_getsockopt() to take the sockptr_t argument such that
a latter patch can make bpf_getsockopt(SOL_IPV6) to reuse
do_ipv6_getsockopt().
Note on the change in ip6_mc_msfget(). This function is to
return an array of sockaddr_storage in optval. This function
is shared between ipv6_get_msfilter() and compat_ipv6_get_msfilter().
However, the sockaddr_storage is stored at different offset of the
optval because of the difference between group_filter and
compat_group_filter. Thus, a new 'ss_offset' argument is
added to ip6_mc_msfget().
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
Link: https://lore.kernel.org/r/20220902002853.2892532-1-kafai@fb.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'net/ipv6/ipv6_sockglue.c')
-rw-r--r-- | net/ipv6/ipv6_sockglue.c | 69 |
1 files changed, 38 insertions, 31 deletions
diff --git a/net/ipv6/ipv6_sockglue.c b/net/ipv6/ipv6_sockglue.c index 4ab284a4adf8..4d9fadef2d3e 100644 --- a/net/ipv6/ipv6_sockglue.c +++ b/net/ipv6/ipv6_sockglue.c @@ -1030,7 +1030,7 @@ int ipv6_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval, EXPORT_SYMBOL(ipv6_setsockopt); static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt, - int optname, char __user *optval, int len) + int optname, sockptr_t optval, int len) { struct ipv6_opt_hdr *hdr; @@ -1058,45 +1058,44 @@ static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt, return 0; len = min_t(unsigned int, len, ipv6_optlen(hdr)); - if (copy_to_user(optval, hdr, len)) + if (copy_to_sockptr(optval, hdr, len)) return -EFAULT; return len; } -static int ipv6_get_msfilter(struct sock *sk, void __user *optval, - int __user *optlen, int len) +static int ipv6_get_msfilter(struct sock *sk, sockptr_t optval, + sockptr_t optlen, int len) { const int size0 = offsetof(struct group_filter, gf_slist_flex); - struct group_filter __user *p = optval; struct group_filter gsf; int num; int err; if (len < size0) return -EINVAL; - if (copy_from_user(&gsf, p, size0)) + if (copy_from_sockptr(&gsf, optval, size0)) return -EFAULT; if (gsf.gf_group.ss_family != AF_INET6) return -EADDRNOTAVAIL; num = gsf.gf_numsrc; lock_sock(sk); - err = ip6_mc_msfget(sk, &gsf, p->gf_slist_flex); + err = ip6_mc_msfget(sk, &gsf, optval, size0); if (!err) { if (num > gsf.gf_numsrc) num = gsf.gf_numsrc; - if (put_user(GROUP_FILTER_SIZE(num), optlen) || - copy_to_user(p, &gsf, size0)) + len = GROUP_FILTER_SIZE(num); + if (copy_to_sockptr(optlen, &len, sizeof(int)) || + copy_to_sockptr(optval, &gsf, size0)) err = -EFAULT; } release_sock(sk); return err; } -static int compat_ipv6_get_msfilter(struct sock *sk, void __user *optval, - int __user *optlen, int len) +static int compat_ipv6_get_msfilter(struct sock *sk, sockptr_t optval, + sockptr_t optlen, int len) { const int size0 = offsetof(struct compat_group_filter, gf_slist_flex); - struct compat_group_filter __user *p = optval; struct compat_group_filter gf32; struct group_filter gf; int err; @@ -1105,7 +1104,7 @@ static int compat_ipv6_get_msfilter(struct sock *sk, void __user *optval, if (len < size0) return -EINVAL; - if (copy_from_user(&gf32, p, size0)) + if (copy_from_sockptr(&gf32, optval, size0)) return -EFAULT; gf.gf_interface = gf32.gf_interface; gf.gf_fmode = gf32.gf_fmode; @@ -1116,22 +1115,24 @@ static int compat_ipv6_get_msfilter(struct sock *sk, void __user *optval, return -EADDRNOTAVAIL; lock_sock(sk); - err = ip6_mc_msfget(sk, &gf, p->gf_slist_flex); + err = ip6_mc_msfget(sk, &gf, optval, size0); release_sock(sk); if (err) return err; if (num > gf.gf_numsrc) num = gf.gf_numsrc; len = GROUP_FILTER_SIZE(num) - (sizeof(gf)-sizeof(gf32)); - if (put_user(len, optlen) || - put_user(gf.gf_fmode, &p->gf_fmode) || - put_user(gf.gf_numsrc, &p->gf_numsrc)) + if (copy_to_sockptr(optlen, &len, sizeof(int)) || + copy_to_sockptr_offset(optval, offsetof(struct compat_group_filter, gf_fmode), + &gf.gf_fmode, sizeof(gf32.gf_fmode)) || + copy_to_sockptr_offset(optval, offsetof(struct compat_group_filter, gf_numsrc), + &gf.gf_numsrc, sizeof(gf32.gf_numsrc))) return -EFAULT; return 0; } static int do_ipv6_getsockopt(struct sock *sk, int level, int optname, - char __user *optval, int __user *optlen) + sockptr_t optval, sockptr_t optlen) { struct ipv6_pinfo *np = inet6_sk(sk); int len; @@ -1140,7 +1141,7 @@ static int do_ipv6_getsockopt(struct sock *sk, int level, int optname, if (ip6_mroute_opt(optname)) return ip6_mroute_getsockopt(sk, optname, optval, optlen); - if (get_user(len, optlen)) + if (copy_from_sockptr(&len, optlen, sizeof(int))) return -EFAULT; switch (optname) { case IPV6_ADDRFORM: @@ -1164,10 +1165,15 @@ static int do_ipv6_getsockopt(struct sock *sk, int level, int optname, if (sk->sk_type != SOCK_STREAM) return -ENOPROTOOPT; - msg.msg_control_user = optval; + if (optval.is_kernel) { + msg.msg_control_is_user = false; + msg.msg_control = optval.kernel; + } else { + msg.msg_control_is_user = true; + msg.msg_control_user = optval.user; + } msg.msg_controllen = len; msg.msg_flags = 0; - msg.msg_control_is_user = true; lock_sock(sk); skb = np->pktoptions; @@ -1210,7 +1216,7 @@ static int do_ipv6_getsockopt(struct sock *sk, int level, int optname, } } len -= msg.msg_controllen; - return put_user(len, optlen); + return copy_to_sockptr(optlen, &len, sizeof(int)); } case IPV6_MTU: { @@ -1270,7 +1276,7 @@ static int do_ipv6_getsockopt(struct sock *sk, int level, int optname, /* check if ipv6_getsockopt_sticky() returns err code */ if (len < 0) return len; - return put_user(len, optlen); + return copy_to_sockptr(optlen, &len, sizeof(int)); } case IPV6_RECVHOPOPTS: @@ -1324,9 +1330,9 @@ static int do_ipv6_getsockopt(struct sock *sk, int level, int optname, if (!mtuinfo.ip6m_mtu) return -ENOTCONN; - if (put_user(len, optlen)) + if (copy_to_sockptr(optlen, &len, sizeof(int))) return -EFAULT; - if (copy_to_user(optval, &mtuinfo, len)) + if (copy_to_sockptr(optval, &mtuinfo, len)) return -EFAULT; return 0; @@ -1403,7 +1409,7 @@ static int do_ipv6_getsockopt(struct sock *sk, int level, int optname, if (len < sizeof(freq)) return -EINVAL; - if (copy_from_user(&freq, optval, sizeof(freq))) + if (copy_from_sockptr(&freq, optval, sizeof(freq))) return -EFAULT; if (freq.flr_action != IPV6_FL_A_GET) @@ -1418,9 +1424,9 @@ static int do_ipv6_getsockopt(struct sock *sk, int level, int optname, if (val < 0) return val; - if (put_user(len, optlen)) + if (copy_to_sockptr(optlen, &len, sizeof(int))) return -EFAULT; - if (copy_to_user(optval, &freq, len)) + if (copy_to_sockptr(optval, &freq, len)) return -EFAULT; return 0; @@ -1472,9 +1478,9 @@ static int do_ipv6_getsockopt(struct sock *sk, int level, int optname, return -ENOPROTOOPT; } len = min_t(unsigned int, sizeof(int), len); - if (put_user(len, optlen)) + if (copy_to_sockptr(optlen, &len, sizeof(int))) return -EFAULT; - if (copy_to_user(optval, &val, len)) + if (copy_to_sockptr(optval, &val, len)) return -EFAULT; return 0; } @@ -1490,7 +1496,8 @@ int ipv6_getsockopt(struct sock *sk, int level, int optname, if (level != SOL_IPV6) return -ENOPROTOOPT; - err = do_ipv6_getsockopt(sk, level, optname, optval, optlen); + err = do_ipv6_getsockopt(sk, level, optname, + USER_SOCKPTR(optval), USER_SOCKPTR(optlen)); #ifdef CONFIG_NETFILTER /* we need to exclude all possible ENOPROTOOPTs except default case */ if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) { |