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| author |   Martin KaFai Lau <martin.lau@kernel.org> | 2022-09-01 17:28:28 -0700 |
|---|---|---|
| committer |   Alexei Starovoitov <ast@kernel.org> | 2022-09-02 20:34:31 -0700 |
| commit | 728f064cd7ebea8c182e99e6f152c8b4a0a6b071 (patch) | |
| tree | a0491f91a8d5b8c473f9e33b205442e8ebe0dfe5 /net/ipv4/igmp.c | |
| parent | bpf: net: Avoid do_tcp_getsockopt() taking sk lock when called from bpf (diff) | |
| download | wireguard-linux-728f064cd7ebea8c182e99e6f152c8b4a0a6b071.tar.xz wireguard-linux-728f064cd7ebea8c182e99e6f152c8b4a0a6b071.zip | |
bpf: net: Change do_ip_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_ip_getsockopt() to take the sockptr_t argument such that
a latter patch can make bpf_getsockopt(SOL_IP) to reuse
do_ip_getsockopt().
Note on the change in ip_mc_gsfget(). This function is to
return an array of sockaddr_storage in optval. This function
is shared between ip_get_mcast_msfilter() and
compat_ip_get_mcast_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 ip_mc_gsfget().
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
Link: https://lore.kernel.org/r/20220902002828.2890585-1-kafai@fb.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'net/ipv4/igmp.c')
| -rw-r--r-- | net/ipv4/igmp.c | 22 |
1 files changed, 13 insertions, 9 deletions
diff --git a/net/ipv4/igmp.c b/net/ipv4/igmp.c index e3ab0cb61624..df0660d818ac 100644 --- a/net/ipv4/igmp.c +++ b/net/ipv4/igmp.c @@ -2529,11 +2529,10 @@ done: err = ip_mc_leave_group(sk, &imr); return err; } - int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf, - struct ip_msfilter __user *optval, int __user *optlen) + sockptr_t optval, sockptr_t optlen) { - int err, len, count, copycount; + int err, len, count, copycount, msf_size; struct ip_mreqn imr; __be32 addr = msf->imsf_multiaddr; struct ip_mc_socklist *pmc; @@ -2575,12 +2574,15 @@ int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf, copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc; len = flex_array_size(psl, sl_addr, copycount); msf->imsf_numsrc = count; - if (put_user(IP_MSFILTER_SIZE(copycount), optlen) || - copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) { + msf_size = IP_MSFILTER_SIZE(copycount); + if (copy_to_sockptr(optlen, &msf_size, sizeof(int)) || + copy_to_sockptr(optval, msf, IP_MSFILTER_SIZE(0))) { return -EFAULT; } if (len && - copy_to_user(&optval->imsf_slist_flex[0], psl->sl_addr, len)) + copy_to_sockptr_offset(optval, + offsetof(struct ip_msfilter, imsf_slist_flex), + psl->sl_addr, len)) return -EFAULT; return 0; done: @@ -2588,7 +2590,7 @@ done: } int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf, - struct sockaddr_storage __user *p) + sockptr_t optval, size_t ss_offset) { int i, count, copycount; struct sockaddr_in *psin; @@ -2618,15 +2620,17 @@ int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf, count = psl ? psl->sl_count : 0; copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc; gsf->gf_numsrc = count; - for (i = 0; i < copycount; i++, p++) { + for (i = 0; i < copycount; i++) { struct sockaddr_storage ss; psin = (struct sockaddr_in *)&ss; memset(&ss, 0, sizeof(ss)); psin->sin_family = AF_INET; psin->sin_addr.s_addr = psl->sl_addr[i]; - if (copy_to_user(p, &ss, sizeof(ss))) + if (copy_to_sockptr_offset(optval, ss_offset, + &ss, sizeof(ss))) return -EFAULT; + ss_offset += sizeof(ss); } return 0; } |