![Davide Caratti](/assets/img/avatar_default.png)
the following script: # tc filter add dev crash0 egress matchall \ > action pedit ex munge ip ttl set 10 pass index 90 # tc actions replace action pedit \ > ex munge ip ttl set 10 goto chain 42 index 90 cookie c1a0c1a0 # tc actions show action pedit had the following output: Error: Failed to init TC action chain. We have an error talking to the kernel total acts 1 action order 0: pedit action goto chain 42 keys 1 index 90 ref 2 bind 1 key #0 at ipv4+8: val 0a000000 mask 00ffffff cookie c1a0c1a0 Then, the first packet transmitted by crash0 made the kernel crash: BUG: unable to handle kernel NULL pointer dereference at 0000000000000000 #PF error: [normal kernel read fault] PGD 0 P4D 0 Oops: 0000 [#1] SMP PTI CPU: 2 PID: 0 Comm: swapper/2 Not tainted 5.0.0-rc4.gotochain_crash+ #533 Hardware name: Red Hat KVM, BIOS 0.5.1 01/01/2011 RIP: 0010:tcf_action_exec+0xb8/0x100 Code: 00 00 00 20 74 1d 83 f8 03 75 09 49 83 c4 08 4d 39 ec 75 bc 48 83 c4 10 5b 5d 41 5c 41 5d 41 5e 41 5f c3 49 8b 97 a8 00 00 00 <48> 8b 12 48 89 55 00 48 83 c4 10 5b 5d 41 5c 41 5d 41 5e 41 5f c3 RSP: 0018:ffff94a73db03be0 EFLAGS: 00010246 RAX: 000000002000002a RBX: ffff94a6ee4c0700 RCX: 000000000000000a RDX: 0000000000000000 RSI: ffff94a6ed22c800 RDI: 0000000000000000 RBP: ffff94a73db03c80 R08: ffff94a7386fa4c8 R09: ffff94a73229ea20 R10: 0000000000000000 R11: 0000000000000000 R12: ffff94a6ed22cb00 R13: ffff94a6ed22cb08 R14: 0000000000000001 R15: ffff94a6ed22c800 FS: 0000000000000000(0000) GS:ffff94a73db00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 000000007120e002 CR4: 00000000001606e0 Call Trace: <IRQ> tcf_classify+0x58/0x120 __dev_queue_xmit+0x40a/0x890 ? ip6_finish_output2+0x369/0x590 ip6_finish_output2+0x369/0x590 ? ip6_output+0x68/0x110 ip6_output+0x68/0x110 ? nf_hook.constprop.35+0x79/0xc0 mld_sendpack+0x16f/0x220 mld_ifc_timer_expire+0x195/0x2c0 ? igmp6_timer_handler+0x70/0x70 call_timer_fn+0x2b/0x130 run_timer_softirq+0x3e8/0x440 ? tick_sched_timer+0x37/0x70 __do_softirq+0xe3/0x2f5 irq_exit+0xf0/0x100 smp_apic_timer_interrupt+0x6c/0x130 apic_timer_interrupt+0xf/0x20 </IRQ> RIP: 0010:native_safe_halt+0x2/0x10 Code: 4e ff ff ff 7f f3 c3 65 48 8b 04 25 00 5c 01 00 f0 80 48 02 20 48 8b 00 a8 08 74 8b eb c1 90 90 90 90 90 90 90 90 90 90 fb f4 <c3> 0f 1f 00 66 2e 0f 1f 84 00 00 00 00 00 f4 c3 90 90 90 90 90 90 RSP: 0018:ffffab1740387eb8 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: ffffffffb18184f0 RBX: 0000000000000002 RCX: 0000000000000001 RDX: 0000000000000001 RSI: 0000000000000087 RDI: 0000000000000002 RBP: 0000000000000002 R08: 000f168fa695f9a9 R09: 0000000000000020 R10: 0000000000000004 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 ? __sched_text_end+0x1/0x1 default_idle+0x1c/0x140 do_idle+0x1c4/0x280 cpu_startup_entry+0x19/0x20 start_secondary+0x1a7/0x200 secondary_startup_64+0xa4/0xb0 Modules linked in: act_pedit veth ip6table_filter ip6_tables iptable_filter binfmt_misc ext4 mbcache jbd2 crct10dif_pclmul crc32_pclmul ghash_clmulni_intel snd_hda_codec_generic snd_hda_intel snd_hda_codec snd_hwdep aesni_intel snd_hda_core crypto_simd snd_seq cryptd glue_helper snd_seq_device snd_pcm joydev snd_timer pcspkr virtio_balloon snd soundcore i2c_piix4 nfsd auth_rpcgss nfs_acl lockd grace sunrpc ip_tables xfs qxl ata_generic pata_acpi drm_kms_helper virtio_net net_failover syscopyarea sysfillrect sysimgblt failover virtio_blk fb_sys_fops virtio_console ttm drm crc32c_intel serio_raw ata_piix virtio_pci libata virtio_ring virtio floppy dm_mirror dm_region_hash dm_log dm_mod CR2: 0000000000000000 Validating the control action within tcf_pedit_init() proved to fix the above issue. A TDC selftest is added to verify the correct behavior. Fixes:db50514f9a
("net: sched: add termination action to allow goto chain") Fixes:97763dc0f4
("net_sched: reject unknown tcfa_action values") Signed-off-by: Davide Caratti <dcaratti@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
531 lines
12 KiB
C
531 lines
12 KiB
C
/*
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* net/sched/act_pedit.c Generic packet editor
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* Authors: Jamal Hadi Salim (2002-4)
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*/
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/string.h>
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#include <linux/errno.h>
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#include <linux/skbuff.h>
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#include <linux/rtnetlink.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <net/netlink.h>
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#include <net/pkt_sched.h>
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#include <linux/tc_act/tc_pedit.h>
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#include <net/tc_act/tc_pedit.h>
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#include <uapi/linux/tc_act/tc_pedit.h>
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#include <net/pkt_cls.h>
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static unsigned int pedit_net_id;
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static struct tc_action_ops act_pedit_ops;
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static const struct nla_policy pedit_policy[TCA_PEDIT_MAX + 1] = {
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[TCA_PEDIT_PARMS] = { .len = sizeof(struct tc_pedit) },
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[TCA_PEDIT_KEYS_EX] = { .type = NLA_NESTED },
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};
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static const struct nla_policy pedit_key_ex_policy[TCA_PEDIT_KEY_EX_MAX + 1] = {
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[TCA_PEDIT_KEY_EX_HTYPE] = { .type = NLA_U16 },
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[TCA_PEDIT_KEY_EX_CMD] = { .type = NLA_U16 },
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};
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static struct tcf_pedit_key_ex *tcf_pedit_keys_ex_parse(struct nlattr *nla,
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u8 n)
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{
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struct tcf_pedit_key_ex *keys_ex;
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struct tcf_pedit_key_ex *k;
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const struct nlattr *ka;
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int err = -EINVAL;
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int rem;
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if (!nla || !n)
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return NULL;
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keys_ex = kcalloc(n, sizeof(*k), GFP_KERNEL);
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if (!keys_ex)
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return ERR_PTR(-ENOMEM);
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k = keys_ex;
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nla_for_each_nested(ka, nla, rem) {
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struct nlattr *tb[TCA_PEDIT_KEY_EX_MAX + 1];
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if (!n) {
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err = -EINVAL;
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goto err_out;
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}
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n--;
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if (nla_type(ka) != TCA_PEDIT_KEY_EX) {
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err = -EINVAL;
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goto err_out;
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}
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err = nla_parse_nested(tb, TCA_PEDIT_KEY_EX_MAX, ka,
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pedit_key_ex_policy, NULL);
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if (err)
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goto err_out;
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if (!tb[TCA_PEDIT_KEY_EX_HTYPE] ||
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!tb[TCA_PEDIT_KEY_EX_CMD]) {
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err = -EINVAL;
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goto err_out;
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}
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k->htype = nla_get_u16(tb[TCA_PEDIT_KEY_EX_HTYPE]);
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k->cmd = nla_get_u16(tb[TCA_PEDIT_KEY_EX_CMD]);
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if (k->htype > TCA_PEDIT_HDR_TYPE_MAX ||
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k->cmd > TCA_PEDIT_CMD_MAX) {
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err = -EINVAL;
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goto err_out;
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}
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k++;
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}
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if (n) {
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err = -EINVAL;
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goto err_out;
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}
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return keys_ex;
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err_out:
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kfree(keys_ex);
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return ERR_PTR(err);
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}
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static int tcf_pedit_key_ex_dump(struct sk_buff *skb,
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struct tcf_pedit_key_ex *keys_ex, int n)
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{
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struct nlattr *keys_start = nla_nest_start(skb, TCA_PEDIT_KEYS_EX);
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if (!keys_start)
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goto nla_failure;
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for (; n > 0; n--) {
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struct nlattr *key_start;
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key_start = nla_nest_start(skb, TCA_PEDIT_KEY_EX);
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if (!key_start)
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goto nla_failure;
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if (nla_put_u16(skb, TCA_PEDIT_KEY_EX_HTYPE, keys_ex->htype) ||
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nla_put_u16(skb, TCA_PEDIT_KEY_EX_CMD, keys_ex->cmd))
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goto nla_failure;
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nla_nest_end(skb, key_start);
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keys_ex++;
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}
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nla_nest_end(skb, keys_start);
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return 0;
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nla_failure:
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nla_nest_cancel(skb, keys_start);
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return -EINVAL;
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}
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static int tcf_pedit_init(struct net *net, struct nlattr *nla,
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struct nlattr *est, struct tc_action **a,
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int ovr, int bind, bool rtnl_held,
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struct tcf_proto *tp, struct netlink_ext_ack *extack)
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{
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struct tc_action_net *tn = net_generic(net, pedit_net_id);
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struct nlattr *tb[TCA_PEDIT_MAX + 1];
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struct tcf_chain *goto_ch = NULL;
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struct tc_pedit_key *keys = NULL;
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struct tcf_pedit_key_ex *keys_ex;
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struct tc_pedit *parm;
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struct nlattr *pattr;
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struct tcf_pedit *p;
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int ret = 0, err;
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int ksize;
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if (!nla) {
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NL_SET_ERR_MSG_MOD(extack, "Pedit requires attributes to be passed");
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return -EINVAL;
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}
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err = nla_parse_nested(tb, TCA_PEDIT_MAX, nla, pedit_policy, NULL);
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if (err < 0)
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return err;
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pattr = tb[TCA_PEDIT_PARMS];
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if (!pattr)
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pattr = tb[TCA_PEDIT_PARMS_EX];
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if (!pattr) {
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NL_SET_ERR_MSG_MOD(extack, "Missing required TCA_PEDIT_PARMS or TCA_PEDIT_PARMS_EX pedit attribute");
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return -EINVAL;
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}
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parm = nla_data(pattr);
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ksize = parm->nkeys * sizeof(struct tc_pedit_key);
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if (nla_len(pattr) < sizeof(*parm) + ksize) {
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NL_SET_ERR_MSG_ATTR(extack, pattr, "Length of TCA_PEDIT_PARMS or TCA_PEDIT_PARMS_EX pedit attribute is invalid");
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return -EINVAL;
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}
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keys_ex = tcf_pedit_keys_ex_parse(tb[TCA_PEDIT_KEYS_EX], parm->nkeys);
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if (IS_ERR(keys_ex))
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return PTR_ERR(keys_ex);
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err = tcf_idr_check_alloc(tn, &parm->index, a, bind);
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if (!err) {
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if (!parm->nkeys) {
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tcf_idr_cleanup(tn, parm->index);
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NL_SET_ERR_MSG_MOD(extack, "Pedit requires keys to be passed");
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ret = -EINVAL;
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goto out_free;
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}
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ret = tcf_idr_create(tn, parm->index, est, a,
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&act_pedit_ops, bind, false);
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if (ret) {
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tcf_idr_cleanup(tn, parm->index);
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goto out_free;
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}
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ret = ACT_P_CREATED;
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} else if (err > 0) {
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if (bind)
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goto out_free;
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if (!ovr) {
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ret = -EEXIST;
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goto out_release;
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}
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} else {
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ret = err;
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goto out_free;
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}
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err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, extack);
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if (err < 0) {
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ret = err;
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goto out_release;
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}
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p = to_pedit(*a);
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spin_lock_bh(&p->tcf_lock);
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if (ret == ACT_P_CREATED ||
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(p->tcfp_nkeys && p->tcfp_nkeys != parm->nkeys)) {
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keys = kmalloc(ksize, GFP_ATOMIC);
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if (!keys) {
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spin_unlock_bh(&p->tcf_lock);
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ret = -ENOMEM;
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goto put_chain;
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}
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kfree(p->tcfp_keys);
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p->tcfp_keys = keys;
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p->tcfp_nkeys = parm->nkeys;
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}
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memcpy(p->tcfp_keys, parm->keys, ksize);
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p->tcfp_flags = parm->flags;
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goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch);
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kfree(p->tcfp_keys_ex);
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p->tcfp_keys_ex = keys_ex;
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spin_unlock_bh(&p->tcf_lock);
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if (goto_ch)
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tcf_chain_put_by_act(goto_ch);
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if (ret == ACT_P_CREATED)
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tcf_idr_insert(tn, *a);
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return ret;
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put_chain:
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if (goto_ch)
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tcf_chain_put_by_act(goto_ch);
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out_release:
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tcf_idr_release(*a, bind);
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out_free:
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kfree(keys_ex);
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return ret;
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}
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static void tcf_pedit_cleanup(struct tc_action *a)
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{
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struct tcf_pedit *p = to_pedit(a);
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struct tc_pedit_key *keys = p->tcfp_keys;
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kfree(keys);
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kfree(p->tcfp_keys_ex);
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}
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static bool offset_valid(struct sk_buff *skb, int offset)
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{
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if (offset > 0 && offset > skb->len)
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return false;
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if (offset < 0 && -offset > skb_headroom(skb))
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return false;
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return true;
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}
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static int pedit_skb_hdr_offset(struct sk_buff *skb,
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enum pedit_header_type htype, int *hoffset)
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{
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int ret = -EINVAL;
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switch (htype) {
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case TCA_PEDIT_KEY_EX_HDR_TYPE_ETH:
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if (skb_mac_header_was_set(skb)) {
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*hoffset = skb_mac_offset(skb);
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ret = 0;
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}
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break;
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case TCA_PEDIT_KEY_EX_HDR_TYPE_NETWORK:
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case TCA_PEDIT_KEY_EX_HDR_TYPE_IP4:
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case TCA_PEDIT_KEY_EX_HDR_TYPE_IP6:
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*hoffset = skb_network_offset(skb);
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ret = 0;
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break;
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case TCA_PEDIT_KEY_EX_HDR_TYPE_TCP:
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case TCA_PEDIT_KEY_EX_HDR_TYPE_UDP:
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if (skb_transport_header_was_set(skb)) {
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*hoffset = skb_transport_offset(skb);
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ret = 0;
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}
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break;
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default:
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ret = -EINVAL;
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break;
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}
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return ret;
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}
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static int tcf_pedit_act(struct sk_buff *skb, const struct tc_action *a,
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struct tcf_result *res)
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{
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struct tcf_pedit *p = to_pedit(a);
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int i;
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if (skb_unclone(skb, GFP_ATOMIC))
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return p->tcf_action;
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spin_lock(&p->tcf_lock);
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tcf_lastuse_update(&p->tcf_tm);
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if (p->tcfp_nkeys > 0) {
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struct tc_pedit_key *tkey = p->tcfp_keys;
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struct tcf_pedit_key_ex *tkey_ex = p->tcfp_keys_ex;
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enum pedit_header_type htype =
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TCA_PEDIT_KEY_EX_HDR_TYPE_NETWORK;
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enum pedit_cmd cmd = TCA_PEDIT_KEY_EX_CMD_SET;
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for (i = p->tcfp_nkeys; i > 0; i--, tkey++) {
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u32 *ptr, hdata;
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int offset = tkey->off;
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int hoffset;
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u32 val;
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int rc;
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if (tkey_ex) {
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htype = tkey_ex->htype;
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cmd = tkey_ex->cmd;
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tkey_ex++;
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}
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rc = pedit_skb_hdr_offset(skb, htype, &hoffset);
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if (rc) {
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pr_info("tc action pedit bad header type specified (0x%x)\n",
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htype);
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goto bad;
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}
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if (tkey->offmask) {
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u8 *d, _d;
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if (!offset_valid(skb, hoffset + tkey->at)) {
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pr_info("tc action pedit 'at' offset %d out of bounds\n",
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hoffset + tkey->at);
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goto bad;
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}
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d = skb_header_pointer(skb, hoffset + tkey->at,
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sizeof(_d), &_d);
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if (!d)
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goto bad;
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offset += (*d & tkey->offmask) >> tkey->shift;
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}
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if (offset % 4) {
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pr_info("tc action pedit offset must be on 32 bit boundaries\n");
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goto bad;
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}
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if (!offset_valid(skb, hoffset + offset)) {
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pr_info("tc action pedit offset %d out of bounds\n",
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hoffset + offset);
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goto bad;
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}
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ptr = skb_header_pointer(skb, hoffset + offset,
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sizeof(hdata), &hdata);
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if (!ptr)
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goto bad;
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/* just do it, baby */
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switch (cmd) {
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case TCA_PEDIT_KEY_EX_CMD_SET:
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val = tkey->val;
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break;
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case TCA_PEDIT_KEY_EX_CMD_ADD:
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val = (*ptr + tkey->val) & ~tkey->mask;
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break;
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default:
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pr_info("tc action pedit bad command (%d)\n",
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cmd);
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goto bad;
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}
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*ptr = ((*ptr & tkey->mask) ^ val);
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if (ptr == &hdata)
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skb_store_bits(skb, hoffset + offset, ptr, 4);
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}
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goto done;
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} else {
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WARN(1, "pedit BUG: index %d\n", p->tcf_index);
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}
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bad:
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p->tcf_qstats.overlimits++;
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done:
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bstats_update(&p->tcf_bstats, skb);
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spin_unlock(&p->tcf_lock);
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return p->tcf_action;
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}
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static int tcf_pedit_dump(struct sk_buff *skb, struct tc_action *a,
|
|
int bind, int ref)
|
|
{
|
|
unsigned char *b = skb_tail_pointer(skb);
|
|
struct tcf_pedit *p = to_pedit(a);
|
|
struct tc_pedit *opt;
|
|
struct tcf_t t;
|
|
int s;
|
|
|
|
s = struct_size(opt, keys, p->tcfp_nkeys);
|
|
|
|
/* netlink spinlocks held above us - must use ATOMIC */
|
|
opt = kzalloc(s, GFP_ATOMIC);
|
|
if (unlikely(!opt))
|
|
return -ENOBUFS;
|
|
|
|
spin_lock_bh(&p->tcf_lock);
|
|
memcpy(opt->keys, p->tcfp_keys,
|
|
p->tcfp_nkeys * sizeof(struct tc_pedit_key));
|
|
opt->index = p->tcf_index;
|
|
opt->nkeys = p->tcfp_nkeys;
|
|
opt->flags = p->tcfp_flags;
|
|
opt->action = p->tcf_action;
|
|
opt->refcnt = refcount_read(&p->tcf_refcnt) - ref;
|
|
opt->bindcnt = atomic_read(&p->tcf_bindcnt) - bind;
|
|
|
|
if (p->tcfp_keys_ex) {
|
|
if (tcf_pedit_key_ex_dump(skb,
|
|
p->tcfp_keys_ex,
|
|
p->tcfp_nkeys))
|
|
goto nla_put_failure;
|
|
|
|
if (nla_put(skb, TCA_PEDIT_PARMS_EX, s, opt))
|
|
goto nla_put_failure;
|
|
} else {
|
|
if (nla_put(skb, TCA_PEDIT_PARMS, s, opt))
|
|
goto nla_put_failure;
|
|
}
|
|
|
|
tcf_tm_dump(&t, &p->tcf_tm);
|
|
if (nla_put_64bit(skb, TCA_PEDIT_TM, sizeof(t), &t, TCA_PEDIT_PAD))
|
|
goto nla_put_failure;
|
|
spin_unlock_bh(&p->tcf_lock);
|
|
|
|
kfree(opt);
|
|
return skb->len;
|
|
|
|
nla_put_failure:
|
|
spin_unlock_bh(&p->tcf_lock);
|
|
nlmsg_trim(skb, b);
|
|
kfree(opt);
|
|
return -1;
|
|
}
|
|
|
|
static int tcf_pedit_walker(struct net *net, struct sk_buff *skb,
|
|
struct netlink_callback *cb, int type,
|
|
const struct tc_action_ops *ops,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
struct tc_action_net *tn = net_generic(net, pedit_net_id);
|
|
|
|
return tcf_generic_walker(tn, skb, cb, type, ops, extack);
|
|
}
|
|
|
|
static int tcf_pedit_search(struct net *net, struct tc_action **a, u32 index)
|
|
{
|
|
struct tc_action_net *tn = net_generic(net, pedit_net_id);
|
|
|
|
return tcf_idr_search(tn, a, index);
|
|
}
|
|
|
|
static struct tc_action_ops act_pedit_ops = {
|
|
.kind = "pedit",
|
|
.id = TCA_ID_PEDIT,
|
|
.owner = THIS_MODULE,
|
|
.act = tcf_pedit_act,
|
|
.dump = tcf_pedit_dump,
|
|
.cleanup = tcf_pedit_cleanup,
|
|
.init = tcf_pedit_init,
|
|
.walk = tcf_pedit_walker,
|
|
.lookup = tcf_pedit_search,
|
|
.size = sizeof(struct tcf_pedit),
|
|
};
|
|
|
|
static __net_init int pedit_init_net(struct net *net)
|
|
{
|
|
struct tc_action_net *tn = net_generic(net, pedit_net_id);
|
|
|
|
return tc_action_net_init(tn, &act_pedit_ops);
|
|
}
|
|
|
|
static void __net_exit pedit_exit_net(struct list_head *net_list)
|
|
{
|
|
tc_action_net_exit(net_list, pedit_net_id);
|
|
}
|
|
|
|
static struct pernet_operations pedit_net_ops = {
|
|
.init = pedit_init_net,
|
|
.exit_batch = pedit_exit_net,
|
|
.id = &pedit_net_id,
|
|
.size = sizeof(struct tc_action_net),
|
|
};
|
|
|
|
MODULE_AUTHOR("Jamal Hadi Salim(2002-4)");
|
|
MODULE_DESCRIPTION("Generic Packet Editor actions");
|
|
MODULE_LICENSE("GPL");
|
|
|
|
static int __init pedit_init_module(void)
|
|
{
|
|
return tcf_register_action(&act_pedit_ops, &pedit_net_ops);
|
|
}
|
|
|
|
static void __exit pedit_cleanup_module(void)
|
|
{
|
|
tcf_unregister_action(&act_pedit_ops, &pedit_net_ops);
|
|
}
|
|
|
|
module_init(pedit_init_module);
|
|
module_exit(pedit_cleanup_module);
|