2010-08-18 21:10:35 +08:00
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/*
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* Checksum updating actions
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*
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* Copyright (c) 2010 Gregoire Baron <baronchon@n7mm.org>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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*/
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#include <linux/types.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/spinlock.h>
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#include <linux/netlink.h>
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#include <net/netlink.h>
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#include <linux/rtnetlink.h>
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#include <linux/skbuff.h>
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#include <net/ip.h>
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#include <net/ipv6.h>
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#include <net/icmp.h>
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#include <linux/icmpv6.h>
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#include <linux/igmp.h>
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#include <net/tcp.h>
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#include <net/udp.h>
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2010-08-23 11:31:14 +08:00
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#include <net/ip6_checksum.h>
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2017-01-09 18:24:21 +08:00
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#include <net/sctp/checksum.h>
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2010-08-18 21:10:35 +08:00
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#include <net/act_api.h>
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#include <linux/tc_act/tc_csum.h>
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#include <net/tc_act/tc_csum.h>
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static const struct nla_policy csum_policy[TCA_CSUM_MAX + 1] = {
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[TCA_CSUM_PARMS] = { .len = sizeof(struct tc_csum), },
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};
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netns: make struct pernet_operations::id unsigned int
Make struct pernet_operations::id unsigned.
There are 2 reasons to do so:
1)
This field is really an index into an zero based array and
thus is unsigned entity. Using negative value is out-of-bound
access by definition.
2)
On x86_64 unsigned 32-bit data which are mixed with pointers
via array indexing or offsets added or subtracted to pointers
are preffered to signed 32-bit data.
"int" being used as an array index needs to be sign-extended
to 64-bit before being used.
void f(long *p, int i)
{
g(p[i]);
}
roughly translates to
movsx rsi, esi
mov rdi, [rsi+...]
call g
MOVSX is 3 byte instruction which isn't necessary if the variable is
unsigned because x86_64 is zero extending by default.
Now, there is net_generic() function which, you guessed it right, uses
"int" as an array index:
static inline void *net_generic(const struct net *net, int id)
{
...
ptr = ng->ptr[id - 1];
...
}
And this function is used a lot, so those sign extensions add up.
Patch snipes ~1730 bytes on allyesconfig kernel (without all junk
messing with code generation):
add/remove: 0/0 grow/shrink: 70/598 up/down: 396/-2126 (-1730)
Unfortunately some functions actually grow bigger.
This is a semmingly random artefact of code generation with register
allocator being used differently. gcc decides that some variable
needs to live in new r8+ registers and every access now requires REX
prefix. Or it is shifted into r12, so [r12+0] addressing mode has to be
used which is longer than [r8]
However, overall balance is in negative direction:
add/remove: 0/0 grow/shrink: 70/598 up/down: 396/-2126 (-1730)
function old new delta
nfsd4_lock 3886 3959 +73
tipc_link_build_proto_msg 1096 1140 +44
mac80211_hwsim_new_radio 2776 2808 +32
tipc_mon_rcv 1032 1058 +26
svcauth_gss_legacy_init 1413 1429 +16
tipc_bcbase_select_primary 379 392 +13
nfsd4_exchange_id 1247 1260 +13
nfsd4_setclientid_confirm 782 793 +11
...
put_client_renew_locked 494 480 -14
ip_set_sockfn_get 730 716 -14
geneve_sock_add 829 813 -16
nfsd4_sequence_done 721 703 -18
nlmclnt_lookup_host 708 686 -22
nfsd4_lockt 1085 1063 -22
nfs_get_client 1077 1050 -27
tcf_bpf_init 1106 1076 -30
nfsd4_encode_fattr 5997 5930 -67
Total: Before=154856051, After=154854321, chg -0.00%
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2016-11-17 09:58:21 +08:00
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static unsigned int csum_net_id;
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2016-07-26 07:09:41 +08:00
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static struct tc_action_ops act_csum_ops;
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2016-02-23 07:57:53 +08:00
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static int tcf_csum_init(struct net *net, struct nlattr *nla,
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2016-07-26 07:09:41 +08:00
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struct nlattr *est, struct tc_action **a, int ovr,
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2016-02-23 07:57:53 +08:00
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int bind)
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2010-08-18 21:10:35 +08:00
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{
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2016-02-23 07:57:53 +08:00
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struct tc_action_net *tn = net_generic(net, csum_net_id);
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2010-08-18 21:10:35 +08:00
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struct nlattr *tb[TCA_CSUM_MAX + 1];
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struct tc_csum *parm;
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struct tcf_csum *p;
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int ret = 0, err;
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if (nla == NULL)
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return -EINVAL;
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2017-04-12 20:34:07 +08:00
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err = nla_parse_nested(tb, TCA_CSUM_MAX, nla, csum_policy, NULL);
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2010-08-18 21:10:35 +08:00
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if (err < 0)
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return err;
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if (tb[TCA_CSUM_PARMS] == NULL)
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return -EINVAL;
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parm = nla_data(tb[TCA_CSUM_PARMS]);
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2017-08-30 14:31:59 +08:00
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if (!tcf_idr_check(tn, parm->index, a, bind)) {
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ret = tcf_idr_create(tn, parm->index, est, a,
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&act_csum_ops, bind, false);
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2014-02-12 09:07:31 +08:00
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if (ret)
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return ret;
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2010-08-18 21:10:35 +08:00
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ret = ACT_P_CREATED;
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} else {
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2013-12-23 21:02:11 +08:00
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if (bind)/* dont override defaults */
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return 0;
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2017-08-30 14:31:59 +08:00
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tcf_idr_release(*a, bind);
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2013-12-23 21:02:11 +08:00
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if (!ovr)
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2010-08-18 21:10:35 +08:00
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return -EEXIST;
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}
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2016-07-26 07:09:41 +08:00
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p = to_tcf_csum(*a);
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2010-08-18 21:10:35 +08:00
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spin_lock_bh(&p->tcf_lock);
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p->tcf_action = parm->action;
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p->update_flags = parm->update_flags;
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spin_unlock_bh(&p->tcf_lock);
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if (ret == ACT_P_CREATED)
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2017-08-30 14:31:59 +08:00
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tcf_idr_insert(tn, *a);
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2010-08-18 21:10:35 +08:00
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return ret;
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}
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/**
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* tcf_csum_skb_nextlayer - Get next layer pointer
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* @skb: sk_buff to use
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* @ihl: previous summed headers length
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* @ipl: complete packet length
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* @jhl: next header length
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*
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* Check the expected next layer availability in the specified sk_buff.
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* Return the next layer pointer if pass, NULL otherwise.
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*/
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static void *tcf_csum_skb_nextlayer(struct sk_buff *skb,
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unsigned int ihl, unsigned int ipl,
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unsigned int jhl)
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{
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int ntkoff = skb_network_offset(skb);
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int hl = ihl + jhl;
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if (!pskb_may_pull(skb, ipl + ntkoff) || (ipl < hl) ||
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2016-02-20 06:05:25 +08:00
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skb_try_make_writable(skb, hl + ntkoff))
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2010-08-18 21:10:35 +08:00
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return NULL;
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else
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return (void *)(skb_network_header(skb) + ihl);
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}
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2016-09-18 20:45:33 +08:00
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static int tcf_csum_ipv4_icmp(struct sk_buff *skb, unsigned int ihl,
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unsigned int ipl)
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2010-08-18 21:10:35 +08:00
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{
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struct icmphdr *icmph;
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icmph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*icmph));
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if (icmph == NULL)
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return 0;
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icmph->checksum = 0;
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skb->csum = csum_partial(icmph, ipl - ihl, 0);
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icmph->checksum = csum_fold(skb->csum);
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skb->ip_summed = CHECKSUM_NONE;
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return 1;
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}
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static int tcf_csum_ipv4_igmp(struct sk_buff *skb,
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unsigned int ihl, unsigned int ipl)
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{
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struct igmphdr *igmph;
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igmph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*igmph));
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if (igmph == NULL)
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return 0;
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igmph->csum = 0;
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skb->csum = csum_partial(igmph, ipl - ihl, 0);
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igmph->csum = csum_fold(skb->csum);
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skb->ip_summed = CHECKSUM_NONE;
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return 1;
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}
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2016-09-18 20:45:33 +08:00
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static int tcf_csum_ipv6_icmp(struct sk_buff *skb, unsigned int ihl,
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unsigned int ipl)
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2010-08-18 21:10:35 +08:00
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{
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struct icmp6hdr *icmp6h;
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2013-04-13 02:07:47 +08:00
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const struct ipv6hdr *ip6h;
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2010-08-18 21:10:35 +08:00
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icmp6h = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*icmp6h));
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if (icmp6h == NULL)
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return 0;
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2013-04-13 02:07:47 +08:00
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ip6h = ipv6_hdr(skb);
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2010-08-18 21:10:35 +08:00
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icmp6h->icmp6_cksum = 0;
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skb->csum = csum_partial(icmp6h, ipl - ihl, 0);
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icmp6h->icmp6_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
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ipl - ihl, IPPROTO_ICMPV6,
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skb->csum);
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skb->ip_summed = CHECKSUM_NONE;
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return 1;
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}
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2016-09-18 20:45:33 +08:00
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static int tcf_csum_ipv4_tcp(struct sk_buff *skb, unsigned int ihl,
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unsigned int ipl)
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2010-08-18 21:10:35 +08:00
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{
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struct tcphdr *tcph;
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2013-04-13 02:07:47 +08:00
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const struct iphdr *iph;
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2010-08-18 21:10:35 +08:00
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2017-03-23 17:39:40 +08:00
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if (skb_is_gso(skb) && skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4)
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return 1;
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2010-08-18 21:10:35 +08:00
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tcph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*tcph));
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if (tcph == NULL)
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return 0;
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2013-04-13 02:07:47 +08:00
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iph = ip_hdr(skb);
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2010-08-18 21:10:35 +08:00
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tcph->check = 0;
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skb->csum = csum_partial(tcph, ipl - ihl, 0);
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tcph->check = tcp_v4_check(ipl - ihl,
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iph->saddr, iph->daddr, skb->csum);
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skb->ip_summed = CHECKSUM_NONE;
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return 1;
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}
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2016-09-18 20:45:33 +08:00
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static int tcf_csum_ipv6_tcp(struct sk_buff *skb, unsigned int ihl,
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unsigned int ipl)
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2010-08-18 21:10:35 +08:00
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{
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struct tcphdr *tcph;
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2013-04-13 02:07:47 +08:00
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const struct ipv6hdr *ip6h;
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2010-08-18 21:10:35 +08:00
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2017-03-23 17:39:40 +08:00
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if (skb_is_gso(skb) && skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6)
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return 1;
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2010-08-18 21:10:35 +08:00
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tcph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*tcph));
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if (tcph == NULL)
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return 0;
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2013-04-13 02:07:47 +08:00
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ip6h = ipv6_hdr(skb);
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2010-08-18 21:10:35 +08:00
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tcph->check = 0;
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skb->csum = csum_partial(tcph, ipl - ihl, 0);
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tcph->check = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
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ipl - ihl, IPPROTO_TCP,
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skb->csum);
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skb->ip_summed = CHECKSUM_NONE;
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return 1;
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}
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2016-09-18 20:45:33 +08:00
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static int tcf_csum_ipv4_udp(struct sk_buff *skb, unsigned int ihl,
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unsigned int ipl, int udplite)
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2010-08-18 21:10:35 +08:00
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{
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struct udphdr *udph;
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2013-04-13 02:07:47 +08:00
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const struct iphdr *iph;
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2010-08-18 21:10:35 +08:00
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u16 ul;
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net: accept UFO datagrams from tuntap and packet
Tuntap and similar devices can inject GSO packets. Accept type
VIRTIO_NET_HDR_GSO_UDP, even though not generating UFO natively.
Processes are expected to use feature negotiation such as TUNSETOFFLOAD
to detect supported offload types and refrain from injecting other
packets. This process breaks down with live migration: guest kernels
do not renegotiate flags, so destination hosts need to expose all
features that the source host does.
Partially revert the UFO removal from 182e0b6b5846~1..d9d30adf5677.
This patch introduces nearly(*) no new code to simplify verification.
It brings back verbatim tuntap UFO negotiation, VIRTIO_NET_HDR_GSO_UDP
insertion and software UFO segmentation.
It does not reinstate protocol stack support, hardware offload
(NETIF_F_UFO), SKB_GSO_UDP tunneling in SKB_GSO_SOFTWARE or reception
of VIRTIO_NET_HDR_GSO_UDP packets in tuntap.
To support SKB_GSO_UDP reappearing in the stack, also reinstate
logic in act_csum and openvswitch. Achieve equivalence with v4.13 HEAD
by squashing in commit 939912216fa8 ("net: skb_needs_check() removes
CHECKSUM_UNNECESSARY check for tx.") and reverting commit 8d63bee643f1
("net: avoid skb_warn_bad_offload false positives on UFO").
(*) To avoid having to bring back skb_shinfo(skb)->ip6_frag_id,
ipv6_proxy_select_ident is changed to return a __be32 and this is
assigned directly to the frag_hdr. Also, SKB_GSO_UDP is inserted
at the end of the enum to minimize code churn.
Tested
Booted a v4.13 guest kernel with QEMU. On a host kernel before this
patch `ethtool -k eth0` shows UFO disabled. After the patch, it is
enabled, same as on a v4.13 host kernel.
A UFO packet sent from the guest appears on the tap device:
host:
nc -l -p -u 8000 &
tcpdump -n -i tap0
guest:
dd if=/dev/zero of=payload.txt bs=1 count=2000
nc -u 192.16.1.1 8000 < payload.txt
Direct tap to tap transmission of VIRTIO_NET_HDR_GSO_UDP succeeds,
packets arriving fragmented:
./with_tap_pair.sh ./tap_send_ufo tap0 tap1
(from https://github.com/wdebruij/kerneltools/tree/master/tests)
Changes
v1 -> v2
- simplified set_offload change (review comment)
- documented test procedure
Link: http://lkml.kernel.org/r/<CAF=yD-LuUeDuL9YWPJD9ykOZ0QCjNeznPDr6whqZ9NGMNF12Mw@mail.gmail.com>
Fixes: fb652fdfe837 ("macvlan/macvtap: Remove NETIF_F_UFO advertisement.")
Reported-by: Michal Kubecek <mkubecek@suse.cz>
Signed-off-by: Willem de Bruijn <willemb@google.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2017-11-21 23:22:25 +08:00
|
|
|
if (skb_is_gso(skb) && skb_shinfo(skb)->gso_type & SKB_GSO_UDP)
|
|
|
|
|
return 1;
|
|
|
|
|
|
2010-08-23 11:27:58 +08:00
|
|
|
/*
|
|
|
|
|
* Support both UDP and UDPLITE checksum algorithms, Don't use
|
|
|
|
|
* udph->len to get the real length without any protocol check,
|
2010-08-18 21:10:35 +08:00
|
|
|
* UDPLITE uses udph->len for another thing,
|
|
|
|
|
* Use iph->tot_len, or just ipl.
|
|
|
|
|
*/
|
|
|
|
|
|
|
|
|
|
udph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*udph));
|
|
|
|
|
if (udph == NULL)
|
|
|
|
|
return 0;
|
|
|
|
|
|
2013-04-13 02:07:47 +08:00
|
|
|
iph = ip_hdr(skb);
|
2010-08-18 21:10:35 +08:00
|
|
|
ul = ntohs(udph->len);
|
|
|
|
|
|
|
|
|
|
if (udplite || udph->check) {
|
|
|
|
|
|
|
|
|
|
udph->check = 0;
|
|
|
|
|
|
|
|
|
|
if (udplite) {
|
|
|
|
|
if (ul == 0)
|
|
|
|
|
skb->csum = csum_partial(udph, ipl - ihl, 0);
|
|
|
|
|
else if ((ul >= sizeof(*udph)) && (ul <= ipl - ihl))
|
|
|
|
|
skb->csum = csum_partial(udph, ul, 0);
|
|
|
|
|
else
|
|
|
|
|
goto ignore_obscure_skb;
|
|
|
|
|
} else {
|
|
|
|
|
if (ul != ipl - ihl)
|
|
|
|
|
goto ignore_obscure_skb;
|
|
|
|
|
|
|
|
|
|
skb->csum = csum_partial(udph, ul, 0);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
udph->check = csum_tcpudp_magic(iph->saddr, iph->daddr,
|
|
|
|
|
ul, iph->protocol,
|
|
|
|
|
skb->csum);
|
|
|
|
|
|
|
|
|
|
if (!udph->check)
|
|
|
|
|
udph->check = CSUM_MANGLED_0;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
skb->ip_summed = CHECKSUM_NONE;
|
|
|
|
|
|
|
|
|
|
ignore_obscure_skb:
|
|
|
|
|
return 1;
|
|
|
|
|
}
|
|
|
|
|
|
2016-09-18 20:45:33 +08:00
|
|
|
static int tcf_csum_ipv6_udp(struct sk_buff *skb, unsigned int ihl,
|
|
|
|
|
unsigned int ipl, int udplite)
|
2010-08-18 21:10:35 +08:00
|
|
|
{
|
|
|
|
|
struct udphdr *udph;
|
2013-04-13 02:07:47 +08:00
|
|
|
const struct ipv6hdr *ip6h;
|
2010-08-18 21:10:35 +08:00
|
|
|
u16 ul;
|
|
|
|
|
|
net: accept UFO datagrams from tuntap and packet
Tuntap and similar devices can inject GSO packets. Accept type
VIRTIO_NET_HDR_GSO_UDP, even though not generating UFO natively.
Processes are expected to use feature negotiation such as TUNSETOFFLOAD
to detect supported offload types and refrain from injecting other
packets. This process breaks down with live migration: guest kernels
do not renegotiate flags, so destination hosts need to expose all
features that the source host does.
Partially revert the UFO removal from 182e0b6b5846~1..d9d30adf5677.
This patch introduces nearly(*) no new code to simplify verification.
It brings back verbatim tuntap UFO negotiation, VIRTIO_NET_HDR_GSO_UDP
insertion and software UFO segmentation.
It does not reinstate protocol stack support, hardware offload
(NETIF_F_UFO), SKB_GSO_UDP tunneling in SKB_GSO_SOFTWARE or reception
of VIRTIO_NET_HDR_GSO_UDP packets in tuntap.
To support SKB_GSO_UDP reappearing in the stack, also reinstate
logic in act_csum and openvswitch. Achieve equivalence with v4.13 HEAD
by squashing in commit 939912216fa8 ("net: skb_needs_check() removes
CHECKSUM_UNNECESSARY check for tx.") and reverting commit 8d63bee643f1
("net: avoid skb_warn_bad_offload false positives on UFO").
(*) To avoid having to bring back skb_shinfo(skb)->ip6_frag_id,
ipv6_proxy_select_ident is changed to return a __be32 and this is
assigned directly to the frag_hdr. Also, SKB_GSO_UDP is inserted
at the end of the enum to minimize code churn.
Tested
Booted a v4.13 guest kernel with QEMU. On a host kernel before this
patch `ethtool -k eth0` shows UFO disabled. After the patch, it is
enabled, same as on a v4.13 host kernel.
A UFO packet sent from the guest appears on the tap device:
host:
nc -l -p -u 8000 &
tcpdump -n -i tap0
guest:
dd if=/dev/zero of=payload.txt bs=1 count=2000
nc -u 192.16.1.1 8000 < payload.txt
Direct tap to tap transmission of VIRTIO_NET_HDR_GSO_UDP succeeds,
packets arriving fragmented:
./with_tap_pair.sh ./tap_send_ufo tap0 tap1
(from https://github.com/wdebruij/kerneltools/tree/master/tests)
Changes
v1 -> v2
- simplified set_offload change (review comment)
- documented test procedure
Link: http://lkml.kernel.org/r/<CAF=yD-LuUeDuL9YWPJD9ykOZ0QCjNeznPDr6whqZ9NGMNF12Mw@mail.gmail.com>
Fixes: fb652fdfe837 ("macvlan/macvtap: Remove NETIF_F_UFO advertisement.")
Reported-by: Michal Kubecek <mkubecek@suse.cz>
Signed-off-by: Willem de Bruijn <willemb@google.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2017-11-21 23:22:25 +08:00
|
|
|
if (skb_is_gso(skb) && skb_shinfo(skb)->gso_type & SKB_GSO_UDP)
|
|
|
|
|
return 1;
|
|
|
|
|
|
2010-08-23 11:27:58 +08:00
|
|
|
/*
|
|
|
|
|
* Support both UDP and UDPLITE checksum algorithms, Don't use
|
|
|
|
|
* udph->len to get the real length without any protocol check,
|
2010-08-18 21:10:35 +08:00
|
|
|
* UDPLITE uses udph->len for another thing,
|
|
|
|
|
* Use ip6h->payload_len + sizeof(*ip6h) ... , or just ipl.
|
|
|
|
|
*/
|
|
|
|
|
|
|
|
|
|
udph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*udph));
|
|
|
|
|
if (udph == NULL)
|
|
|
|
|
return 0;
|
|
|
|
|
|
2013-04-13 02:07:47 +08:00
|
|
|
ip6h = ipv6_hdr(skb);
|
2010-08-18 21:10:35 +08:00
|
|
|
ul = ntohs(udph->len);
|
|
|
|
|
|
|
|
|
|
udph->check = 0;
|
|
|
|
|
|
|
|
|
|
if (udplite) {
|
|
|
|
|
if (ul == 0)
|
|
|
|
|
skb->csum = csum_partial(udph, ipl - ihl, 0);
|
|
|
|
|
|
|
|
|
|
else if ((ul >= sizeof(*udph)) && (ul <= ipl - ihl))
|
|
|
|
|
skb->csum = csum_partial(udph, ul, 0);
|
|
|
|
|
|
|
|
|
|
else
|
|
|
|
|
goto ignore_obscure_skb;
|
|
|
|
|
} else {
|
|
|
|
|
if (ul != ipl - ihl)
|
|
|
|
|
goto ignore_obscure_skb;
|
|
|
|
|
|
|
|
|
|
skb->csum = csum_partial(udph, ul, 0);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
udph->check = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, ul,
|
|
|
|
|
udplite ? IPPROTO_UDPLITE : IPPROTO_UDP,
|
|
|
|
|
skb->csum);
|
|
|
|
|
|
|
|
|
|
if (!udph->check)
|
|
|
|
|
udph->check = CSUM_MANGLED_0;
|
|
|
|
|
|
|
|
|
|
skb->ip_summed = CHECKSUM_NONE;
|
|
|
|
|
|
|
|
|
|
ignore_obscure_skb:
|
|
|
|
|
return 1;
|
|
|
|
|
}
|
|
|
|
|
|
2017-01-09 18:24:21 +08:00
|
|
|
static int tcf_csum_sctp(struct sk_buff *skb, unsigned int ihl,
|
|
|
|
|
unsigned int ipl)
|
|
|
|
|
{
|
|
|
|
|
struct sctphdr *sctph;
|
|
|
|
|
|
|
|
|
|
if (skb_is_gso(skb) && skb_shinfo(skb)->gso_type & SKB_GSO_SCTP)
|
|
|
|
|
return 1;
|
|
|
|
|
|
|
|
|
|
sctph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*sctph));
|
|
|
|
|
if (!sctph)
|
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
|
|
sctph->checksum = sctp_compute_cksum(skb,
|
|
|
|
|
skb_network_offset(skb) + ihl);
|
|
|
|
|
skb->ip_summed = CHECKSUM_NONE;
|
2017-05-18 21:44:40 +08:00
|
|
|
skb->csum_not_inet = 0;
|
2017-01-09 18:24:21 +08:00
|
|
|
|
|
|
|
|
return 1;
|
|
|
|
|
}
|
|
|
|
|
|
2010-08-18 21:10:35 +08:00
|
|
|
static int tcf_csum_ipv4(struct sk_buff *skb, u32 update_flags)
|
|
|
|
|
{
|
2013-04-13 02:07:47 +08:00
|
|
|
const struct iphdr *iph;
|
2010-08-18 21:10:35 +08:00
|
|
|
int ntkoff;
|
|
|
|
|
|
|
|
|
|
ntkoff = skb_network_offset(skb);
|
|
|
|
|
|
|
|
|
|
if (!pskb_may_pull(skb, sizeof(*iph) + ntkoff))
|
|
|
|
|
goto fail;
|
|
|
|
|
|
|
|
|
|
iph = ip_hdr(skb);
|
|
|
|
|
|
|
|
|
|
switch (iph->frag_off & htons(IP_OFFSET) ? 0 : iph->protocol) {
|
|
|
|
|
case IPPROTO_ICMP:
|
|
|
|
|
if (update_flags & TCA_CSUM_UPDATE_FLAG_ICMP)
|
2010-08-23 11:27:58 +08:00
|
|
|
if (!tcf_csum_ipv4_icmp(skb, iph->ihl * 4,
|
|
|
|
|
ntohs(iph->tot_len)))
|
2010-08-18 21:10:35 +08:00
|
|
|
goto fail;
|
|
|
|
|
break;
|
|
|
|
|
case IPPROTO_IGMP:
|
|
|
|
|
if (update_flags & TCA_CSUM_UPDATE_FLAG_IGMP)
|
2010-08-23 11:27:58 +08:00
|
|
|
if (!tcf_csum_ipv4_igmp(skb, iph->ihl * 4,
|
|
|
|
|
ntohs(iph->tot_len)))
|
2010-08-18 21:10:35 +08:00
|
|
|
goto fail;
|
|
|
|
|
break;
|
|
|
|
|
case IPPROTO_TCP:
|
|
|
|
|
if (update_flags & TCA_CSUM_UPDATE_FLAG_TCP)
|
2013-04-13 02:07:47 +08:00
|
|
|
if (!tcf_csum_ipv4_tcp(skb, iph->ihl * 4,
|
2010-08-23 11:27:58 +08:00
|
|
|
ntohs(iph->tot_len)))
|
2010-08-18 21:10:35 +08:00
|
|
|
goto fail;
|
|
|
|
|
break;
|
|
|
|
|
case IPPROTO_UDP:
|
|
|
|
|
if (update_flags & TCA_CSUM_UPDATE_FLAG_UDP)
|
2013-04-13 02:07:47 +08:00
|
|
|
if (!tcf_csum_ipv4_udp(skb, iph->ihl * 4,
|
2010-08-23 11:27:58 +08:00
|
|
|
ntohs(iph->tot_len), 0))
|
2010-08-18 21:10:35 +08:00
|
|
|
goto fail;
|
|
|
|
|
break;
|
|
|
|
|
case IPPROTO_UDPLITE:
|
|
|
|
|
if (update_flags & TCA_CSUM_UPDATE_FLAG_UDPLITE)
|
2013-04-13 02:07:47 +08:00
|
|
|
if (!tcf_csum_ipv4_udp(skb, iph->ihl * 4,
|
2010-08-23 11:27:58 +08:00
|
|
|
ntohs(iph->tot_len), 1))
|
2010-08-18 21:10:35 +08:00
|
|
|
goto fail;
|
|
|
|
|
break;
|
2017-01-09 18:24:21 +08:00
|
|
|
case IPPROTO_SCTP:
|
|
|
|
|
if ((update_flags & TCA_CSUM_UPDATE_FLAG_SCTP) &&
|
|
|
|
|
!tcf_csum_sctp(skb, iph->ihl * 4, ntohs(iph->tot_len)))
|
|
|
|
|
goto fail;
|
|
|
|
|
break;
|
2010-08-18 21:10:35 +08:00
|
|
|
}
|
|
|
|
|
|
|
|
|
|
if (update_flags & TCA_CSUM_UPDATE_FLAG_IPV4HDR) {
|
2016-02-20 06:05:25 +08:00
|
|
|
if (skb_try_make_writable(skb, sizeof(*iph) + ntkoff))
|
2010-08-18 21:10:35 +08:00
|
|
|
goto fail;
|
|
|
|
|
|
2013-04-13 02:07:47 +08:00
|
|
|
ip_send_check(ip_hdr(skb));
|
2010-08-18 21:10:35 +08:00
|
|
|
}
|
|
|
|
|
|
|
|
|
|
return 1;
|
|
|
|
|
|
|
|
|
|
fail:
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
2016-09-18 20:45:33 +08:00
|
|
|
static int tcf_csum_ipv6_hopopts(struct ipv6_opt_hdr *ip6xh, unsigned int ixhl,
|
|
|
|
|
unsigned int *pl)
|
2010-08-18 21:10:35 +08:00
|
|
|
{
|
|
|
|
|
int off, len, optlen;
|
|
|
|
|
unsigned char *xh = (void *)ip6xh;
|
|
|
|
|
|
|
|
|
|
off = sizeof(*ip6xh);
|
|
|
|
|
len = ixhl - off;
|
|
|
|
|
|
|
|
|
|
while (len > 1) {
|
2010-08-23 11:27:58 +08:00
|
|
|
switch (xh[off]) {
|
2012-05-17 14:00:25 +08:00
|
|
|
case IPV6_TLV_PAD1:
|
2010-08-18 21:10:35 +08:00
|
|
|
optlen = 1;
|
|
|
|
|
break;
|
|
|
|
|
case IPV6_TLV_JUMBO:
|
|
|
|
|
optlen = xh[off + 1] + 2;
|
|
|
|
|
if (optlen != 6 || len < 6 || (off & 3) != 2)
|
|
|
|
|
/* wrong jumbo option length/alignment */
|
|
|
|
|
return 0;
|
|
|
|
|
*pl = ntohl(*(__be32 *)(xh + off + 2));
|
|
|
|
|
goto done;
|
|
|
|
|
default:
|
|
|
|
|
optlen = xh[off + 1] + 2;
|
|
|
|
|
if (optlen > len)
|
|
|
|
|
/* ignore obscure options */
|
|
|
|
|
goto done;
|
|
|
|
|
break;
|
|
|
|
|
}
|
|
|
|
|
off += optlen;
|
|
|
|
|
len -= optlen;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
done:
|
|
|
|
|
return 1;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static int tcf_csum_ipv6(struct sk_buff *skb, u32 update_flags)
|
|
|
|
|
{
|
|
|
|
|
struct ipv6hdr *ip6h;
|
|
|
|
|
struct ipv6_opt_hdr *ip6xh;
|
|
|
|
|
unsigned int hl, ixhl;
|
|
|
|
|
unsigned int pl;
|
|
|
|
|
int ntkoff;
|
|
|
|
|
u8 nexthdr;
|
|
|
|
|
|
|
|
|
|
ntkoff = skb_network_offset(skb);
|
|
|
|
|
|
|
|
|
|
hl = sizeof(*ip6h);
|
|
|
|
|
|
|
|
|
|
if (!pskb_may_pull(skb, hl + ntkoff))
|
|
|
|
|
goto fail;
|
|
|
|
|
|
|
|
|
|
ip6h = ipv6_hdr(skb);
|
|
|
|
|
|
|
|
|
|
pl = ntohs(ip6h->payload_len);
|
|
|
|
|
nexthdr = ip6h->nexthdr;
|
|
|
|
|
|
|
|
|
|
do {
|
|
|
|
|
switch (nexthdr) {
|
|
|
|
|
case NEXTHDR_FRAGMENT:
|
|
|
|
|
goto ignore_skb;
|
|
|
|
|
case NEXTHDR_ROUTING:
|
|
|
|
|
case NEXTHDR_HOP:
|
|
|
|
|
case NEXTHDR_DEST:
|
|
|
|
|
if (!pskb_may_pull(skb, hl + sizeof(*ip6xh) + ntkoff))
|
|
|
|
|
goto fail;
|
|
|
|
|
ip6xh = (void *)(skb_network_header(skb) + hl);
|
|
|
|
|
ixhl = ipv6_optlen(ip6xh);
|
|
|
|
|
if (!pskb_may_pull(skb, hl + ixhl + ntkoff))
|
|
|
|
|
goto fail;
|
2013-04-13 02:07:47 +08:00
|
|
|
ip6xh = (void *)(skb_network_header(skb) + hl);
|
2010-08-18 21:10:35 +08:00
|
|
|
if ((nexthdr == NEXTHDR_HOP) &&
|
|
|
|
|
!(tcf_csum_ipv6_hopopts(ip6xh, ixhl, &pl)))
|
|
|
|
|
goto fail;
|
|
|
|
|
nexthdr = ip6xh->nexthdr;
|
|
|
|
|
hl += ixhl;
|
|
|
|
|
break;
|
|
|
|
|
case IPPROTO_ICMPV6:
|
|
|
|
|
if (update_flags & TCA_CSUM_UPDATE_FLAG_ICMP)
|
2013-04-13 02:07:47 +08:00
|
|
|
if (!tcf_csum_ipv6_icmp(skb,
|
2010-08-18 21:10:35 +08:00
|
|
|
hl, pl + sizeof(*ip6h)))
|
|
|
|
|
goto fail;
|
|
|
|
|
goto done;
|
|
|
|
|
case IPPROTO_TCP:
|
|
|
|
|
if (update_flags & TCA_CSUM_UPDATE_FLAG_TCP)
|
2013-04-13 02:07:47 +08:00
|
|
|
if (!tcf_csum_ipv6_tcp(skb,
|
2010-08-18 21:10:35 +08:00
|
|
|
hl, pl + sizeof(*ip6h)))
|
|
|
|
|
goto fail;
|
|
|
|
|
goto done;
|
|
|
|
|
case IPPROTO_UDP:
|
|
|
|
|
if (update_flags & TCA_CSUM_UPDATE_FLAG_UDP)
|
2013-04-13 02:07:47 +08:00
|
|
|
if (!tcf_csum_ipv6_udp(skb, hl,
|
2010-08-23 11:27:58 +08:00
|
|
|
pl + sizeof(*ip6h), 0))
|
2010-08-18 21:10:35 +08:00
|
|
|
goto fail;
|
|
|
|
|
goto done;
|
|
|
|
|
case IPPROTO_UDPLITE:
|
|
|
|
|
if (update_flags & TCA_CSUM_UPDATE_FLAG_UDPLITE)
|
2013-04-13 02:07:47 +08:00
|
|
|
if (!tcf_csum_ipv6_udp(skb, hl,
|
2010-08-23 11:27:58 +08:00
|
|
|
pl + sizeof(*ip6h), 1))
|
2010-08-18 21:10:35 +08:00
|
|
|
goto fail;
|
|
|
|
|
goto done;
|
2017-01-09 18:24:21 +08:00
|
|
|
case IPPROTO_SCTP:
|
|
|
|
|
if ((update_flags & TCA_CSUM_UPDATE_FLAG_SCTP) &&
|
|
|
|
|
!tcf_csum_sctp(skb, hl, pl + sizeof(*ip6h)))
|
|
|
|
|
goto fail;
|
|
|
|
|
goto done;
|
2010-08-18 21:10:35 +08:00
|
|
|
default:
|
|
|
|
|
goto ignore_skb;
|
|
|
|
|
}
|
|
|
|
|
} while (pskb_may_pull(skb, hl + 1 + ntkoff));
|
|
|
|
|
|
|
|
|
|
done:
|
|
|
|
|
ignore_skb:
|
|
|
|
|
return 1;
|
|
|
|
|
|
|
|
|
|
fail:
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
2016-09-18 20:45:33 +08:00
|
|
|
static int tcf_csum(struct sk_buff *skb, const struct tc_action *a,
|
|
|
|
|
struct tcf_result *res)
|
2010-08-18 21:10:35 +08:00
|
|
|
{
|
2016-07-26 07:09:41 +08:00
|
|
|
struct tcf_csum *p = to_tcf_csum(a);
|
2010-08-18 21:10:35 +08:00
|
|
|
int action;
|
|
|
|
|
u32 update_flags;
|
|
|
|
|
|
|
|
|
|
spin_lock(&p->tcf_lock);
|
2016-06-06 18:32:53 +08:00
|
|
|
tcf_lastuse_update(&p->tcf_tm);
|
2011-01-09 16:30:54 +08:00
|
|
|
bstats_update(&p->tcf_bstats, skb);
|
2010-08-18 21:10:35 +08:00
|
|
|
action = p->tcf_action;
|
|
|
|
|
update_flags = p->update_flags;
|
|
|
|
|
spin_unlock(&p->tcf_lock);
|
|
|
|
|
|
|
|
|
|
if (unlikely(action == TC_ACT_SHOT))
|
|
|
|
|
goto drop;
|
|
|
|
|
|
2015-01-14 00:13:43 +08:00
|
|
|
switch (tc_skb_protocol(skb)) {
|
2010-08-18 21:10:35 +08:00
|
|
|
case cpu_to_be16(ETH_P_IP):
|
|
|
|
|
if (!tcf_csum_ipv4(skb, update_flags))
|
|
|
|
|
goto drop;
|
|
|
|
|
break;
|
|
|
|
|
case cpu_to_be16(ETH_P_IPV6):
|
|
|
|
|
if (!tcf_csum_ipv6(skb, update_flags))
|
|
|
|
|
goto drop;
|
|
|
|
|
break;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
return action;
|
|
|
|
|
|
|
|
|
|
drop:
|
|
|
|
|
spin_lock(&p->tcf_lock);
|
|
|
|
|
p->tcf_qstats.drops++;
|
|
|
|
|
spin_unlock(&p->tcf_lock);
|
|
|
|
|
return TC_ACT_SHOT;
|
|
|
|
|
}
|
|
|
|
|
|
2016-09-18 20:45:33 +08:00
|
|
|
static int tcf_csum_dump(struct sk_buff *skb, struct tc_action *a, int bind,
|
|
|
|
|
int ref)
|
2010-08-18 21:10:35 +08:00
|
|
|
{
|
|
|
|
|
unsigned char *b = skb_tail_pointer(skb);
|
2016-07-26 07:09:41 +08:00
|
|
|
struct tcf_csum *p = to_tcf_csum(a);
|
2010-08-18 21:10:35 +08:00
|
|
|
struct tc_csum opt = {
|
|
|
|
|
.update_flags = p->update_flags,
|
|
|
|
|
.index = p->tcf_index,
|
|
|
|
|
.action = p->tcf_action,
|
|
|
|
|
.refcnt = p->tcf_refcnt - ref,
|
|
|
|
|
.bindcnt = p->tcf_bindcnt - bind,
|
|
|
|
|
};
|
|
|
|
|
struct tcf_t t;
|
|
|
|
|
|
2012-03-29 17:11:39 +08:00
|
|
|
if (nla_put(skb, TCA_CSUM_PARMS, sizeof(opt), &opt))
|
|
|
|
|
goto nla_put_failure;
|
2016-06-06 18:32:55 +08:00
|
|
|
|
|
|
|
|
tcf_tm_dump(&t, &p->tcf_tm);
|
2016-04-26 16:06:18 +08:00
|
|
|
if (nla_put_64bit(skb, TCA_CSUM_TM, sizeof(t), &t, TCA_CSUM_PAD))
|
2012-03-29 17:11:39 +08:00
|
|
|
goto nla_put_failure;
|
2010-08-18 21:10:35 +08:00
|
|
|
|
|
|
|
|
return skb->len;
|
|
|
|
|
|
|
|
|
|
nla_put_failure:
|
|
|
|
|
nlmsg_trim(skb, b);
|
|
|
|
|
return -1;
|
|
|
|
|
}
|
|
|
|
|
|
2016-02-23 07:57:53 +08:00
|
|
|
static int tcf_csum_walker(struct net *net, struct sk_buff *skb,
|
|
|
|
|
struct netlink_callback *cb, int type,
|
2016-07-26 07:09:41 +08:00
|
|
|
const struct tc_action_ops *ops)
|
2016-02-23 07:57:53 +08:00
|
|
|
{
|
|
|
|
|
struct tc_action_net *tn = net_generic(net, csum_net_id);
|
|
|
|
|
|
2016-07-26 07:09:41 +08:00
|
|
|
return tcf_generic_walker(tn, skb, cb, type, ops);
|
2016-02-23 07:57:53 +08:00
|
|
|
}
|
|
|
|
|
|
2016-07-26 07:09:41 +08:00
|
|
|
static int tcf_csum_search(struct net *net, struct tc_action **a, u32 index)
|
2016-02-23 07:57:53 +08:00
|
|
|
{
|
|
|
|
|
struct tc_action_net *tn = net_generic(net, csum_net_id);
|
|
|
|
|
|
2017-08-30 14:31:59 +08:00
|
|
|
return tcf_idr_search(tn, a, index);
|
2016-02-23 07:57:53 +08:00
|
|
|
}
|
|
|
|
|
|
2010-08-18 21:10:35 +08:00
|
|
|
static struct tc_action_ops act_csum_ops = {
|
2010-08-23 11:27:58 +08:00
|
|
|
.kind = "csum",
|
|
|
|
|
.type = TCA_ACT_CSUM,
|
|
|
|
|
.owner = THIS_MODULE,
|
|
|
|
|
.act = tcf_csum,
|
|
|
|
|
.dump = tcf_csum_dump,
|
|
|
|
|
.init = tcf_csum_init,
|
2016-02-23 07:57:53 +08:00
|
|
|
.walk = tcf_csum_walker,
|
|
|
|
|
.lookup = tcf_csum_search,
|
2016-07-26 07:09:41 +08:00
|
|
|
.size = sizeof(struct tcf_csum),
|
2016-02-23 07:57:53 +08:00
|
|
|
};
|
|
|
|
|
|
|
|
|
|
static __net_init int csum_init_net(struct net *net)
|
|
|
|
|
{
|
|
|
|
|
struct tc_action_net *tn = net_generic(net, csum_net_id);
|
|
|
|
|
|
2017-11-07 05:47:18 +08:00
|
|
|
return tc_action_net_init(tn, &act_csum_ops);
|
2016-02-23 07:57:53 +08:00
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static void __net_exit csum_exit_net(struct net *net)
|
|
|
|
|
{
|
|
|
|
|
struct tc_action_net *tn = net_generic(net, csum_net_id);
|
|
|
|
|
|
|
|
|
|
tc_action_net_exit(tn);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static struct pernet_operations csum_net_ops = {
|
|
|
|
|
.init = csum_init_net,
|
|
|
|
|
.exit = csum_exit_net,
|
|
|
|
|
.id = &csum_net_id,
|
|
|
|
|
.size = sizeof(struct tc_action_net),
|
2010-08-18 21:10:35 +08:00
|
|
|
};
|
|
|
|
|
|
|
|
|
|
MODULE_DESCRIPTION("Checksum updating actions");
|
|
|
|
|
MODULE_LICENSE("GPL");
|
|
|
|
|
|
|
|
|
|
static int __init csum_init_module(void)
|
|
|
|
|
{
|
2016-02-23 07:57:53 +08:00
|
|
|
return tcf_register_action(&act_csum_ops, &csum_net_ops);
|
2010-08-18 21:10:35 +08:00
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static void __exit csum_cleanup_module(void)
|
|
|
|
|
{
|
2016-02-23 07:57:53 +08:00
|
|
|
tcf_unregister_action(&act_csum_ops, &csum_net_ops);
|
2010-08-18 21:10:35 +08:00
|
|
|
}
|
|
|
|
|
|
|
|
|
|
module_init(csum_init_module);
|
|
|
|
|
module_exit(csum_cleanup_module);
|