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[PATCH] knfsd: SUNRPC: teach svc_sendto() to deal with IPv6 addresses

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CMSG_DATA comes in different sizes, depending on address family.

[akpm@linux-foundation.org: remove unneeded do/while (0)]
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>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Chuck Lever 2007-02-12 00:53:36 -08:00 committed by Linus Torvalds
parent 73df0dbaff
commit b92503b25c
1 changed files with 47 additions and 16 deletions
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63
net/sunrpc/svcsock.c
View file

@ -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>
@ -446,6 +447,43 @@ 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: {
struct in_pktinfo *pki = 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));
}
break;
#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
case AF_INET6: {
struct in6_pktinfo *pki = 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));
}
break;
#endif
}
return;
}
/*
* Generic sendto routine
*/
@ -455,9 +493,8 @@ svc_sendto(struct svc_rqst *rqstp, struct xdr_buf *xdr)
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;
@ -470,21 +507,15 @@ svc_sendto(struct svc_rqst *rqstp, struct xdr_buf *xdr)
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;
struct msghdr msg = {
.msg_name = &rqstp->rq_addr,
.msg_namelen = rqstp->rq_addrlen,
.msg_control = cmh,
.msg_controllen = sizeof(buffer),
.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;
svc_set_cmsg_data(rqstp, cmh);
if (sock_sendmsg(sock, &msg, 0) < 0)
goto out;