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ipv6: sr: add support for SRH injection through setsockopt

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This patch adds support for per-socket SRH injection with the setsockopt
system call through the IPPROTO_IPV6, IPV6_RTHDR options.
The SRH is pushed through the ipv6_push_nfrag_opts function.

Signed-off-by: David Lebrun <david.lebrun@uclouvain.be>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David Lebrun 2016-11-08 14:59:21 +01:00 committed by David S. Miller
parent 613fa3ca9e
commit a149e7c7ce
2 changed files with 85 additions and 4 deletions
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79
net/ipv6/exthdrs.c
View File

@ -864,9 +864,9 @@ int ipv6_parse_hopopts(struct sk_buff *skb)
* for headers.
*/
static void ipv6_push_rthdr(struct sk_buff *skb, u8 *proto,
struct ipv6_rt_hdr *opt,
struct in6_addr **addr_p, struct in6_addr *saddr)
static void ipv6_push_rthdr0(struct sk_buff *skb, u8 *proto,
struct ipv6_rt_hdr *opt,
struct in6_addr **addr_p, struct in6_addr *saddr)
{
struct rt0_hdr *phdr, *ihdr;
int hops;
@ -889,6 +889,62 @@ static void ipv6_push_rthdr(struct sk_buff *skb, u8 *proto,
*proto = NEXTHDR_ROUTING;
}
static void ipv6_push_rthdr4(struct sk_buff *skb, u8 *proto,
struct ipv6_rt_hdr *opt,
struct in6_addr **addr_p, struct in6_addr *saddr)
{
struct ipv6_sr_hdr *sr_phdr, *sr_ihdr;
int plen, hops;
sr_ihdr = (struct ipv6_sr_hdr *)opt;
plen = (sr_ihdr->hdrlen + 1) << 3;
sr_phdr = (struct ipv6_sr_hdr *)skb_push(skb, plen);
memcpy(sr_phdr, sr_ihdr, sizeof(struct ipv6_sr_hdr));
hops = sr_ihdr->first_segment + 1;
memcpy(sr_phdr->segments + 1, sr_ihdr->segments + 1,
(hops - 1) * sizeof(struct in6_addr));
sr_phdr->segments[0] = **addr_p;
*addr_p = &sr_ihdr->segments[hops - 1];
#ifdef CONFIG_IPV6_SEG6_HMAC
if (sr_has_hmac(sr_phdr)) {
struct net *net = NULL;
if (skb->dev)
net = dev_net(skb->dev);
else if (skb->sk)
net = sock_net(skb->sk);
WARN_ON(!net);
if (net)
seg6_push_hmac(net, saddr, sr_phdr);
}
#endif
sr_phdr->nexthdr = *proto;
*proto = NEXTHDR_ROUTING;
}
static void ipv6_push_rthdr(struct sk_buff *skb, u8 *proto,
struct ipv6_rt_hdr *opt,
struct in6_addr **addr_p, struct in6_addr *saddr)
{
switch (opt->type) {
case IPV6_SRCRT_TYPE_0:
ipv6_push_rthdr0(skb, proto, opt, addr_p, saddr);
break;
case IPV6_SRCRT_TYPE_4:
ipv6_push_rthdr4(skb, proto, opt, addr_p, saddr);
break;
default:
break;
}
}
static void ipv6_push_exthdr(struct sk_buff *skb, u8 *proto, u8 type, struct ipv6_opt_hdr *opt)
{
struct ipv6_opt_hdr *h = (struct ipv6_opt_hdr *)skb_push(skb, ipv6_optlen(opt));
@ -1130,7 +1186,22 @@ struct in6_addr *fl6_update_dst(struct flowi6 *fl6,
return NULL;
*orig = fl6->daddr;
fl6->daddr = *((struct rt0_hdr *)opt->srcrt)->addr;
switch (opt->srcrt->type) {
case IPV6_SRCRT_TYPE_0:
fl6->daddr = *((struct rt0_hdr *)opt->srcrt)->addr;
break;
case IPV6_SRCRT_TYPE_4:
{
struct ipv6_sr_hdr *srh = (struct ipv6_sr_hdr *)opt->srcrt;
fl6->daddr = srh->segments[srh->first_segment];
break;
}
default:
return NULL;
}
return orig;
}
EXPORT_SYMBOL_GPL(fl6_update_dst);

10
net/ipv6/ipv6_sockglue.c
View File

@ -52,6 +52,7 @@
#include <net/udplite.h>
#include <net/xfrm.h>
#include <net/compat.h>
#include <net/seg6.h>
#include <asm/uaccess.h>
@ -430,6 +431,15 @@ static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
break;
#endif
case IPV6_SRCRT_TYPE_4:
{
struct ipv6_sr_hdr *srh = (struct ipv6_sr_hdr *)
opt->srcrt;
if (!seg6_validate_srh(srh, optlen))
goto sticky_done;
break;
}
default:
goto sticky_done;
}