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Subject[PATCH 012 of 13] knfsd: SUNRPC: support IPv6 addresses in RPC server's UDP receive path

From: Chuck Lever <chuck.lever@oracle.com>

Add support for IPv6 addresses in the RPC server's UDP receive path.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Cc: Aurelien Charbon <aurelien.charbon@ext.bull.net>
Signed-off-by: Neil Brown <neilb@suse.de>

### Diffstat output
./net/sunrpc/svcsock.c | 51 +++++++++++++++++++++++++++++++++++++++++--------
1 file changed, 43 insertions(+), 8 deletions(-)

diff .prev/net/sunrpc/svcsock.c ./net/sunrpc/svcsock.c
--- .prev/net/sunrpc/svcsock.c 2006-12-08 13:59:06.000000000 +1100
+++ ./net/sunrpc/svcsock.c 2006-12-08 13:59:22.000000000 +1100
@@ -717,13 +717,53 @@ svc_write_space(struct sock *sk)
}
}

+static void svc_udp_get_sender_address(struct svc_rqst *rqstp,
+ struct sk_buff *skb)
+{
+ switch (rqstp->rq_sock->sk_sk->sk_family) {
+ case AF_INET:
+ /* this seems to come from net/ipv4/udp.c:udp_recvmsg */
+ do {
+ struct sockaddr_in *sin =
+ (struct sockaddr_in *) &rqstp->rq_addr;
+
+ sin->sin_family = AF_INET;
+ sin->sin_port = skb->h.uh->source;
+ sin->sin_addr.s_addr = skb->nh.iph->saddr;
+ rqstp->rq_daddr.addr.s_addr = skb->nh.iph->daddr;
+ } while (0);
+ break;
+#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
+ case AF_INET6:
+ /* this is derived from net/ipv6/udp.c:udpv6_recvmesg */
+ do {
+ struct sockaddr_in6 *sin6 =
+ (struct sockaddr_in6 *) &rqstp->rq_addr;
+
+ sin6->sin6_family = AF_INET6;
+ sin6->sin6_port = skb->h.uh->source;
+ sin6->sin6_flowinfo = 0;
+ sin6->sin6_scope_id = 0;
+ if (ipv6_addr_type(&sin6->sin6_addr) &
+ IPV6_ADDR_LINKLOCAL)
+ sin6->sin6_scope_id = IP6CB(skb)->iif;
+ ipv6_addr_copy(&sin6->sin6_addr,
+ &skb->nh.ipv6h->saddr);
+ ipv6_addr_copy(&rqstp->rq_daddr.addr6,
+ &skb->nh.ipv6h->saddr);
+ } while (0);
+ break;
+#endif
+ }
+ return;
+}
+
/*
* Receive a datagram from a UDP socket.
*/
static int
svc_udp_recvfrom(struct svc_rqst *rqstp)
{
- struct sockaddr_in *sin = (struct sockaddr_in *) &rqstp->rq_addr;
struct svc_sock *svsk = rqstp->rq_sock;
struct svc_serv *serv = svsk->sk_server;
struct sk_buff *skb;
@@ -775,14 +815,9 @@ svc_udp_recvfrom(struct svc_rqst *rqstp)

len = skb->len - sizeof(struct udphdr);
rqstp->rq_arg.len = len;
+ rqstp->rq_prot = IPPROTO_UDP;

- rqstp->rq_prot = IPPROTO_UDP;
-
- /* Get sender address */
- sin->sin_family = AF_INET;
- sin->sin_port = skb->h.uh->source;
- sin->sin_addr.s_addr = skb->nh.iph->saddr;
- rqstp->rq_daddr.addr.s_addr = skb->nh.iph->daddr;
+ svc_udp_get_sender_address(rqstp, skb);

if (skb_is_nonlinear(skb)) {
/* we have to copy */
-
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