diff options
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/bpf/prog_cgroup_sockopt.rst | 14 | ||||
| -rw-r--r-- | Documentation/networking/ieee802154.rst | 4 |
2 files changed, 16 insertions, 2 deletions
diff --git a/Documentation/bpf/prog_cgroup_sockopt.rst b/Documentation/bpf/prog_cgroup_sockopt.rst index c47d974629ae..172f957204bf 100644 --- a/Documentation/bpf/prog_cgroup_sockopt.rst +++ b/Documentation/bpf/prog_cgroup_sockopt.rst @@ -86,6 +86,20 @@ then the next program in the chain (A) will see those changes, *not* the original input ``setsockopt`` arguments. The potentially modified values will be then passed down to the kernel. +Large optval +============ +When the ``optval`` is greater than the ``PAGE_SIZE``, the BPF program +can access only the first ``PAGE_SIZE`` of that data. So it has to options: + +* Set ``optlen`` to zero, which indicates that the kernel should + use the original buffer from the userspace. Any modifications + done by the BPF program to the ``optval`` are ignored. +* Set ``optlen`` to the value less than ``PAGE_SIZE``, which + indicates that the kernel should use BPF's trimmed ``optval``. + +When the BPF program returns with the ``optlen`` greater than +``PAGE_SIZE``, the userspace will receive ``EFAULT`` errno. + Example ======= diff --git a/Documentation/networking/ieee802154.rst b/Documentation/networking/ieee802154.rst index 36ca823a1122..6f4bf8447a21 100644 --- a/Documentation/networking/ieee802154.rst +++ b/Documentation/networking/ieee802154.rst @@ -30,8 +30,8 @@ Socket API The address family, socket addresses etc. are defined in the include/net/af_ieee802154.h header or in the special header -in the userspace package (see either http://wpan.cakelab.org/ or the -git tree at https://github.com/linux-wpan/wpan-tools). +in the userspace package (see either https://linux-wpan.org/wpan-tools.html +or the git tree at https://github.com/linux-wpan/wpan-tools). 6LoWPAN Linux implementation ============================ |