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Subject[PATCH 009 of 13] knfsd: SUNRPC: teach svc_sendto() to deal with IPv6 addresses

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

CMSG_DATA comes in different sizes, depending on address family.

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 | 69 ++++++++++++++++++++++++++++++++++++-------------
1 file changed, 52 insertions(+), 17 deletions(-)
diff .prev/net/sunrpc/svcsock.c ./net/sunrpc/svcsock.c
--- .prev/net/sunrpc/svcsock.c 2006-12-08 13:57:20.000000000 +1100
+++ ./net/sunrpc/svcsock.c 2006-12-08 13:58:10.000000000 +1100
@@ -36,6 +36,7 @@
#include <net/sock.h>
#include <net/checksum.h>
#include <net/ip.h>
+#include <net/ipv6.h>
#include <net/tcp_states.h>
#include <asm/uaccess.h>
#include <asm/ioctls.h>
@@ -438,6 +439,47 @@ svc_wake_up(struct svc_serv *serv)
}
}

+union svc_pktinfo_u {
+ struct in_pktinfo pkti;
+#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
+ struct in6_pktinfo pkti6;
+#endif
+};
+
+static void svc_set_cmsg_data(struct svc_rqst *rqstp, struct cmsghdr *cmh)
+{
+ switch (rqstp->rq_sock->sk_sk->sk_family) {
+ case AF_INET:
+ do {
+ struct in_pktinfo *pki =
+ (struct in_pktinfo *) CMSG_DATA(cmh);
+
+ cmh->cmsg_level = SOL_IP;
+ cmh->cmsg_type = IP_PKTINFO;
+ pki->ipi_ifindex = 0;
+ pki->ipi_spec_dst.s_addr = rqstp->rq_daddr.addr.s_addr;
+ cmh->cmsg_len = CMSG_LEN(sizeof(*pki));
+ } while (0);
+ break;
+#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
+ case AF_INET6:
+ do {
+ struct in6_pktinfo *pki =
+ (struct in6_pktinfo *) CMSG_DATA(cmh);
+
+ cmh->cmsg_level = SOL_IPV6;
+ cmh->cmsg_type = IPV6_PKTINFO;
+ pki->ipi6_ifindex = 0;
+ ipv6_addr_copy(&pki->ipi6_addr,
+ &rqstp->rq_daddr.addr6);
+ cmh->cmsg_len = CMSG_LEN(sizeof(*pki));
+ } while (0);
+ break;
+#endif
+ }
+ return;
+}
+
/*
* Generic sendto routine
*/
@@ -447,9 +489,8 @@ svc_sendto(struct svc_rqst *rqstp, struc
struct svc_sock *svsk = rqstp->rq_sock;
struct socket *sock = svsk->sk_sock;
int slen;
- char buffer[CMSG_SPACE(sizeof(struct in_pktinfo))];
+ char buffer[CMSG_SPACE(sizeof(union svc_pktinfo_u))];
struct cmsghdr *cmh = (struct cmsghdr *)buffer;
- struct in_pktinfo *pki = (struct in_pktinfo *)CMSG_DATA(cmh);
int len = 0;
int result;
int size;
@@ -462,21 +503,15 @@ svc_sendto(struct svc_rqst *rqstp, struc
slen = xdr->len;

if (rqstp->rq_prot == IPPROTO_UDP) {
- /* set the source and destination */
- struct msghdr msg;
- msg.msg_name = &rqstp->rq_addr;
- msg.msg_namelen = rqstp->rq_addrlen;
- msg.msg_iov = NULL;
- msg.msg_iovlen = 0;
- msg.msg_flags = MSG_MORE;
-
- msg.msg_control = cmh;
- msg.msg_controllen = sizeof(buffer);
- cmh->cmsg_len = CMSG_LEN(sizeof(*pki));
- cmh->cmsg_level = SOL_IP;
- cmh->cmsg_type = IP_PKTINFO;
- pki->ipi_ifindex = 0;
- pki->ipi_spec_dst.s_addr = rqstp->rq_daddr.addr.s_addr;
+ struct msghdr msg = {
+ .msg_name = &rqstp->rq_addr,
+ .msg_namelen = rqstp->rq_addrlen,
+ .msg_control = cmh,
+ .msg_controllen = sizeof(buffer),
+ .msg_flags = MSG_MORE,
+ };
+
+ svc_set_cmsg_data(rqstp, cmh);

if (sock_sendmsg(sock, &msg, 0) < 0)
goto out;
-
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