kernel/linux.git/include/net/net_namespace.h, branch v5.17.9

net: initialize init_net earlier

2022-04-13T17:27:12+00:00

[ Upstream commit 9c1be1935fb68b2413796cdc03d019b8cf35ab51 ] While testing a patch that will follow later ("net: add netns refcount tracker to struct nsproxy") I found that devtmpfs_init() was called before init_net was initialized. This is a bug, because devtmpfs_setup() calls ksys_unshare(CLONE_NEWNS); This has the effect of increasing init_net refcount, which will be later overwritten to 1, as part of setup_net(&init_net) We had too many prior patches [1] trying to work around the root cause. Really, make sure init_net is in BSS section, and that net_ns_init() is called earlier at boot time. Note that another patch ("vfs: add netns refcount tracker to struct fs_context") also will need net_ns_init() being called before vfs_caches_init() As a bonus, this patch saves around 4KB in .data section. [1] f8c46cb39079 ("netns: do not call pernet ops for not yet set up init_net namespace") b5082df8019a ("net: Initialise init_net.count to 1") 734b65417b24 ("net: Statically initialize init_net.dev_base_head") v2: fixed a build error reported by kernel build bots (CONFIG_NET=n) Signed-off-by: Eric Dumazet Signed-off-by: David S. Miller Signed-off-by: Sasha Levin

net: add networking namespace refcount tracker

2021-12-10T14:38:26+00:00

We have 100+ syzbot reports about netns being dismantled too soon, still unresolved as of today. We think a missing get_net() or an extra put_net() is the root cause. In order to find the bug(s), and be able to spot future ones, this patch adds CONFIG_NET_NS_REFCNT_TRACKER and new helpers to precisely pair all put_net() with corresponding get_net(). To use these helpers, each data structure owning a refcount should also use a "netns_tracker" to pair the get and put. Signed-off-by: Eric Dumazet Signed-off-by: Jakub Kicinski

netfilter: remove xt pernet data

2021-08-01T10:00:51+00:00

clusterip is now handled via net_generic. NOTRACK is tiny compared to rest of xt_CT feature set, even the existing deprecation warning is bigger than the actual functionality. Just remove the warning, its not worth keeping/adding a net_generic one. Signed-off-by: Florian Westphal Signed-off-by: Pablo Neira Ayuso

mctp: Add initial routing framework

2021-07-29T14:06:50+00:00

Add a simple routing table, and a couple of route output handlers, and the mctp packet_type & handler. Includes changes from Matt Johnston . Signed-off-by: Jeremy Kerr Signed-off-by: David S. Miller

Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net

2021-06-19T02:47:02+00:00

Trivial conflicts in net/can/isotp.c and tools/testing/selftests/net/mptcp/mptcp_connect.sh scaled_ppm_to_ppb() was moved from drivers/ptp/ptp_clock.c to include/linux/ptp_clock_kernel.h in -next so re-apply the fix there. Signed-off-by: Jakub Kicinski

net/smc: Make SMC statistics network namespace aware

2021-06-16T19:54:02+00:00

Make the gathered SMC statistics network namespace aware, for each namespace collect an own set of statistic information. Signed-off-by: Guvenc Gulce Signed-off-by: Karsten Graul Signed-off-by: David S. Miller

net: inline function get_net_ns_by_fd if NET_NS is disabled

2021-06-15T18:00:45+00:00

The function get_net_ns_by_fd() could be inlined when NET_NS is not enabled. Signed-off-by: Changbin Du Signed-off-by: David S. Miller

net: make get_net_ns return error if NET_NS is disabled

2021-06-12T20:13:08+00:00

There is a panic in socket ioctl cmd SIOCGSKNS when NET_NS is not enabled. The reason is that nsfs tries to access ns->ops but the proc_ns_operations is not implemented in this case. [7.670023] Unable to handle kernel NULL pointer dereference at virtual address 00000010 [7.670268] pgd = 32b54000 [7.670544] [00000010] *pgd=00000000 [7.671861] Internal error: Oops: 5 [#1] SMP ARM [7.672315] Modules linked in: [7.672918] CPU: 0 PID: 1 Comm: systemd Not tainted 5.13.0-rc3-00375-g6799d4f2da49 #16 [7.673309] Hardware name: Generic DT based system [7.673642] PC is at nsfs_evict+0x24/0x30 [7.674486] LR is at clear_inode+0x20/0x9c The same to tun SIOCGSKNS command. To fix this problem, we make get_net_ns() return -EINVAL when NET_NS is disabled. Meanwhile move it to right place net/core/net_namespace.c. Signed-off-by: Changbin Du Fixes: c62cce2caee5 ("net: add an ioctl to get a socket network namespace") Cc: Cong Wang Cc: Jakub Kicinski Cc: David Laight Cc: Christian Brauner Suggested-by: Jakub Kicinski Acked-by: Christian Brauner Signed-off-by: David S. Miller

net: dccp: use net_generic storage

2021-04-09T23:34:56+00:00

DCCP is virtually never used, so no need to use space in struct net for it. Put the pernet ipv4/v6 socket in the dccp ipv4/ipv6 modules instead. Signed-off-by: Florian Westphal Link: https://lore.kernel.org/r/20210408174502.1625-1-fw@strlen.de Signed-off-by: Jakub Kicinski

Merge git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf-next

2021-04-06T23:36:41+00:00

Pablo Neira Ayuso says: ==================== Netfilter updates for net-next The following batch contains Netfilter/IPVS updates for your net-next tree: 1) Simplify log infrastructure modularity: Merge ipv4, ipv6, bridge, netdev and ARP families to nf_log_syslog.c. Add module softdeps. This fixes a rare deadlock condition that might occur when log module autoload is required. From Florian Westphal. 2) Moves part of netfilter related pernet data from struct net to net_generic() infrastructure. All of these users can be modules, so if they are not loaded there is no need to waste space. Size reduction is 7 cachelines on x86_64, also from Florian. 2) Update nftables audit support to report events once per table, to get it aligned with iptables. From Richard Guy Briggs. 3) Check for stale routes from the flowtable garbage collector path. This is fixing IPv6 which breaks due missing check for the dst_cookie. 4) Add a nfnl_fill_hdr() function to simplify netlink + nfnetlink headers setup. 5) Remove documentation on several statified functions. 6) Remove printk on netns creation for the FTP IPVS tracker, from Florian Westphal. 7) Remove unnecessary nf_tables_destroy_list_lock spinlock initialization, from Yang Yingliang. 7) Remove a duplicated forward declaration in ipset, from Wan Jiabing. ==================== Signed-off-by: David S. Miller