mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-22 17:01:14 +00:00
![Tejun Heo](/assets/img/avatar_default.png)
percpu.h is included by sched.h and module.h and thus ends up being included when building most .c files. percpu.h includes slab.h which in turn includes gfp.h making everything defined by the two files universally available and complicating inclusion dependencies. percpu.h -> slab.h dependency is about to be removed. Prepare for this change by updating users of gfp and slab facilities include those headers directly instead of assuming availability. As this conversion needs to touch large number of source files, the following script is used as the basis of conversion. http://userweb.kernel.org/~tj/misc/slabh-sweep.py The script does the followings. * Scan files for gfp and slab usages and update includes such that only the necessary includes are there. ie. if only gfp is used, gfp.h, if slab is used, slab.h. * When the script inserts a new include, it looks at the include blocks and try to put the new include such that its order conforms to its surrounding. It's put in the include block which contains core kernel includes, in the same order that the rest are ordered - alphabetical, Christmas tree, rev-Xmas-tree or at the end if there doesn't seem to be any matching order. * If the script can't find a place to put a new include (mostly because the file doesn't have fitting include block), it prints out an error message indicating which .h file needs to be added to the file. The conversion was done in the following steps. 1. The initial automatic conversion of all .c files updated slightly over 4000 files, deleting around 700 includes and adding ~480 gfp.h and ~3000 slab.h inclusions. The script emitted errors for ~400 files. 2. Each error was manually checked. Some didn't need the inclusion, some needed manual addition while adding it to implementation .h or embedding .c file was more appropriate for others. This step added inclusions to around 150 files. 3. The script was run again and the output was compared to the edits from #2 to make sure no file was left behind. 4. Several build tests were done and a couple of problems were fixed. e.g. lib/decompress_*.c used malloc/free() wrappers around slab APIs requiring slab.h to be added manually. 5. The script was run on all .h files but without automatically editing them as sprinkling gfp.h and slab.h inclusions around .h files could easily lead to inclusion dependency hell. Most gfp.h inclusion directives were ignored as stuff from gfp.h was usually wildly available and often used in preprocessor macros. Each slab.h inclusion directive was examined and added manually as necessary. 6. percpu.h was updated not to include slab.h. 7. Build test were done on the following configurations and failures were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my distributed build env didn't work with gcov compiles) and a few more options had to be turned off depending on archs to make things build (like ipr on powerpc/64 which failed due to missing writeq). * x86 and x86_64 UP and SMP allmodconfig and a custom test config. * powerpc and powerpc64 SMP allmodconfig * sparc and sparc64 SMP allmodconfig * ia64 SMP allmodconfig * s390 SMP allmodconfig * alpha SMP allmodconfig * um on x86_64 SMP allmodconfig 8. percpu.h modifications were reverted so that it could be applied as a separate patch and serve as bisection point. Given the fact that I had only a couple of failures from tests on step 6, I'm fairly confident about the coverage of this conversion patch. If there is a breakage, it's likely to be something in one of the arch headers which should be easily discoverable easily on most builds of the specific arch. Signed-off-by: Tejun Heo <tj@kernel.org> Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
335 lines
7.6 KiB
C
335 lines
7.6 KiB
C
/*
|
|
* IPv6 input
|
|
* Linux INET6 implementation
|
|
*
|
|
* Authors:
|
|
* Pedro Roque <roque@di.fc.ul.pt>
|
|
* Ian P. Morris <I.P.Morris@soton.ac.uk>
|
|
*
|
|
* Based in linux/net/ipv4/ip_input.c
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version
|
|
* 2 of the License, or (at your option) any later version.
|
|
*/
|
|
/* Changes
|
|
*
|
|
* Mitsuru KANDA @USAGI and
|
|
* YOSHIFUJI Hideaki @USAGI: Remove ipv6_parse_exthdrs().
|
|
*/
|
|
|
|
#include <linux/errno.h>
|
|
#include <linux/types.h>
|
|
#include <linux/socket.h>
|
|
#include <linux/sockios.h>
|
|
#include <linux/net.h>
|
|
#include <linux/netdevice.h>
|
|
#include <linux/in6.h>
|
|
#include <linux/icmpv6.h>
|
|
#include <linux/mroute6.h>
|
|
#include <linux/slab.h>
|
|
|
|
#include <linux/netfilter.h>
|
|
#include <linux/netfilter_ipv6.h>
|
|
|
|
#include <net/sock.h>
|
|
#include <net/snmp.h>
|
|
|
|
#include <net/ipv6.h>
|
|
#include <net/protocol.h>
|
|
#include <net/transp_v6.h>
|
|
#include <net/rawv6.h>
|
|
#include <net/ndisc.h>
|
|
#include <net/ip6_route.h>
|
|
#include <net/addrconf.h>
|
|
#include <net/xfrm.h>
|
|
|
|
|
|
|
|
inline int ip6_rcv_finish( struct sk_buff *skb)
|
|
{
|
|
if (skb_dst(skb) == NULL)
|
|
ip6_route_input(skb);
|
|
|
|
return dst_input(skb);
|
|
}
|
|
|
|
int ipv6_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
|
|
{
|
|
struct ipv6hdr *hdr;
|
|
u32 pkt_len;
|
|
struct inet6_dev *idev;
|
|
struct net *net = dev_net(skb->dev);
|
|
|
|
if (skb->pkt_type == PACKET_OTHERHOST) {
|
|
kfree_skb(skb);
|
|
return NET_RX_DROP;
|
|
}
|
|
|
|
rcu_read_lock();
|
|
|
|
idev = __in6_dev_get(skb->dev);
|
|
|
|
IP6_UPD_PO_STATS_BH(net, idev, IPSTATS_MIB_IN, skb->len);
|
|
|
|
if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL ||
|
|
!idev || unlikely(idev->cnf.disable_ipv6)) {
|
|
IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_INDISCARDS);
|
|
goto drop;
|
|
}
|
|
|
|
memset(IP6CB(skb), 0, sizeof(struct inet6_skb_parm));
|
|
|
|
/*
|
|
* Store incoming device index. When the packet will
|
|
* be queued, we cannot refer to skb->dev anymore.
|
|
*
|
|
* BTW, when we send a packet for our own local address on a
|
|
* non-loopback interface (e.g. ethX), it is being delivered
|
|
* via the loopback interface (lo) here; skb->dev = loopback_dev.
|
|
* It, however, should be considered as if it is being
|
|
* arrived via the sending interface (ethX), because of the
|
|
* nature of scoping architecture. --yoshfuji
|
|
*/
|
|
IP6CB(skb)->iif = skb_dst(skb) ? ip6_dst_idev(skb_dst(skb))->dev->ifindex : dev->ifindex;
|
|
|
|
if (unlikely(!pskb_may_pull(skb, sizeof(*hdr))))
|
|
goto err;
|
|
|
|
hdr = ipv6_hdr(skb);
|
|
|
|
if (hdr->version != 6)
|
|
goto err;
|
|
|
|
/*
|
|
* RFC4291 2.5.3
|
|
* A packet received on an interface with a destination address
|
|
* of loopback must be dropped.
|
|
*/
|
|
if (!(dev->flags & IFF_LOOPBACK) &&
|
|
ipv6_addr_loopback(&hdr->daddr))
|
|
goto err;
|
|
|
|
skb->transport_header = skb->network_header + sizeof(*hdr);
|
|
IP6CB(skb)->nhoff = offsetof(struct ipv6hdr, nexthdr);
|
|
|
|
pkt_len = ntohs(hdr->payload_len);
|
|
|
|
/* pkt_len may be zero if Jumbo payload option is present */
|
|
if (pkt_len || hdr->nexthdr != NEXTHDR_HOP) {
|
|
if (pkt_len + sizeof(struct ipv6hdr) > skb->len) {
|
|
IP6_INC_STATS_BH(net,
|
|
idev, IPSTATS_MIB_INTRUNCATEDPKTS);
|
|
goto drop;
|
|
}
|
|
if (pskb_trim_rcsum(skb, pkt_len + sizeof(struct ipv6hdr))) {
|
|
IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_INHDRERRORS);
|
|
goto drop;
|
|
}
|
|
hdr = ipv6_hdr(skb);
|
|
}
|
|
|
|
if (hdr->nexthdr == NEXTHDR_HOP) {
|
|
if (ipv6_parse_hopopts(skb) < 0) {
|
|
IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_INHDRERRORS);
|
|
rcu_read_unlock();
|
|
return NET_RX_DROP;
|
|
}
|
|
}
|
|
|
|
rcu_read_unlock();
|
|
|
|
/* Must drop socket now because of tproxy. */
|
|
skb_orphan(skb);
|
|
|
|
return NF_HOOK(PF_INET6, NF_INET_PRE_ROUTING, skb, dev, NULL,
|
|
ip6_rcv_finish);
|
|
err:
|
|
IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_INHDRERRORS);
|
|
drop:
|
|
rcu_read_unlock();
|
|
kfree_skb(skb);
|
|
return NET_RX_DROP;
|
|
}
|
|
|
|
/*
|
|
* Deliver the packet to the host
|
|
*/
|
|
|
|
|
|
static int ip6_input_finish(struct sk_buff *skb)
|
|
{
|
|
const struct inet6_protocol *ipprot;
|
|
unsigned int nhoff;
|
|
int nexthdr, raw;
|
|
u8 hash;
|
|
struct inet6_dev *idev;
|
|
struct net *net = dev_net(skb_dst(skb)->dev);
|
|
|
|
/*
|
|
* Parse extension headers
|
|
*/
|
|
|
|
rcu_read_lock();
|
|
resubmit:
|
|
idev = ip6_dst_idev(skb_dst(skb));
|
|
if (!pskb_pull(skb, skb_transport_offset(skb)))
|
|
goto discard;
|
|
nhoff = IP6CB(skb)->nhoff;
|
|
nexthdr = skb_network_header(skb)[nhoff];
|
|
|
|
raw = raw6_local_deliver(skb, nexthdr);
|
|
|
|
hash = nexthdr & (MAX_INET_PROTOS - 1);
|
|
if ((ipprot = rcu_dereference(inet6_protos[hash])) != NULL) {
|
|
int ret;
|
|
|
|
if (ipprot->flags & INET6_PROTO_FINAL) {
|
|
struct ipv6hdr *hdr;
|
|
|
|
/* Free reference early: we don't need it any more,
|
|
and it may hold ip_conntrack module loaded
|
|
indefinitely. */
|
|
nf_reset(skb);
|
|
|
|
skb_postpull_rcsum(skb, skb_network_header(skb),
|
|
skb_network_header_len(skb));
|
|
hdr = ipv6_hdr(skb);
|
|
if (ipv6_addr_is_multicast(&hdr->daddr) &&
|
|
!ipv6_chk_mcast_addr(skb->dev, &hdr->daddr,
|
|
&hdr->saddr) &&
|
|
!ipv6_is_mld(skb, nexthdr))
|
|
goto discard;
|
|
}
|
|
if (!(ipprot->flags & INET6_PROTO_NOPOLICY) &&
|
|
!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
|
|
goto discard;
|
|
|
|
ret = ipprot->handler(skb);
|
|
if (ret > 0)
|
|
goto resubmit;
|
|
else if (ret == 0)
|
|
IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_INDELIVERS);
|
|
} else {
|
|
if (!raw) {
|
|
if (xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) {
|
|
IP6_INC_STATS_BH(net, idev,
|
|
IPSTATS_MIB_INUNKNOWNPROTOS);
|
|
icmpv6_send(skb, ICMPV6_PARAMPROB,
|
|
ICMPV6_UNK_NEXTHDR, nhoff);
|
|
}
|
|
} else
|
|
IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_INDELIVERS);
|
|
kfree_skb(skb);
|
|
}
|
|
rcu_read_unlock();
|
|
return 0;
|
|
|
|
discard:
|
|
IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_INDISCARDS);
|
|
rcu_read_unlock();
|
|
kfree_skb(skb);
|
|
return 0;
|
|
}
|
|
|
|
|
|
int ip6_input(struct sk_buff *skb)
|
|
{
|
|
return NF_HOOK(PF_INET6, NF_INET_LOCAL_IN, skb, skb->dev, NULL,
|
|
ip6_input_finish);
|
|
}
|
|
|
|
int ip6_mc_input(struct sk_buff *skb)
|
|
{
|
|
struct ipv6hdr *hdr;
|
|
int deliver;
|
|
|
|
IP6_UPD_PO_STATS_BH(dev_net(skb_dst(skb)->dev),
|
|
ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_INMCAST,
|
|
skb->len);
|
|
|
|
hdr = ipv6_hdr(skb);
|
|
deliver = ipv6_chk_mcast_addr(skb->dev, &hdr->daddr, NULL);
|
|
|
|
#ifdef CONFIG_IPV6_MROUTE
|
|
/*
|
|
* IPv6 multicast router mode is now supported ;)
|
|
*/
|
|
if (dev_net(skb->dev)->ipv6.devconf_all->mc_forwarding &&
|
|
!(ipv6_addr_type(&hdr->daddr) & IPV6_ADDR_LINKLOCAL) &&
|
|
likely(!(IP6CB(skb)->flags & IP6SKB_FORWARDED))) {
|
|
/*
|
|
* Okay, we try to forward - split and duplicate
|
|
* packets.
|
|
*/
|
|
struct sk_buff *skb2;
|
|
struct inet6_skb_parm *opt = IP6CB(skb);
|
|
|
|
/* Check for MLD */
|
|
if (unlikely(opt->ra)) {
|
|
/* Check if this is a mld message */
|
|
u8 *ptr = skb_network_header(skb) + opt->ra;
|
|
struct icmp6hdr *icmp6;
|
|
u8 nexthdr = hdr->nexthdr;
|
|
int offset;
|
|
|
|
/* Check if the value of Router Alert
|
|
* is for MLD (0x0000).
|
|
*/
|
|
if ((ptr[2] | ptr[3]) == 0) {
|
|
deliver = 0;
|
|
|
|
if (!ipv6_ext_hdr(nexthdr)) {
|
|
/* BUG */
|
|
goto out;
|
|
}
|
|
offset = ipv6_skip_exthdr(skb, sizeof(*hdr),
|
|
&nexthdr);
|
|
if (offset < 0)
|
|
goto out;
|
|
|
|
if (nexthdr != IPPROTO_ICMPV6)
|
|
goto out;
|
|
|
|
if (!pskb_may_pull(skb, (skb_network_header(skb) +
|
|
offset + 1 - skb->data)))
|
|
goto out;
|
|
|
|
icmp6 = (struct icmp6hdr *)(skb_network_header(skb) + offset);
|
|
|
|
switch (icmp6->icmp6_type) {
|
|
case ICMPV6_MGM_QUERY:
|
|
case ICMPV6_MGM_REPORT:
|
|
case ICMPV6_MGM_REDUCTION:
|
|
case ICMPV6_MLD2_REPORT:
|
|
deliver = 1;
|
|
break;
|
|
}
|
|
goto out;
|
|
}
|
|
/* unknown RA - process it normally */
|
|
}
|
|
|
|
if (deliver)
|
|
skb2 = skb_clone(skb, GFP_ATOMIC);
|
|
else {
|
|
skb2 = skb;
|
|
skb = NULL;
|
|
}
|
|
|
|
if (skb2) {
|
|
ip6_mr_input(skb2);
|
|
}
|
|
}
|
|
out:
|
|
#endif
|
|
if (likely(deliver))
|
|
ip6_input(skb);
|
|
else {
|
|
/* discard */
|
|
kfree_skb(skb);
|
|
}
|
|
|
|
return 0;
|
|
}
|