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rxrpc: Use IPv4 addresses throught the IPv6

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AF_RXRPC opens an IPv6 socket through which to send and receive network
packets, both IPv6 and IPv4.  It currently turns AF_INET addresses into
AF_INET-as-AF_INET6 addresses based on an assumption that this was
necessary; on further inspection of the code, however, it turns out that
the IPv6 code just farms packets aimed at AF_INET addresses out to the IPv4
code.

Fix AF_RXRPC to use AF_INET addresses directly when given them.

Fixes: 7b674e390e ("rxrpc: Fix IPv6 support")
Signed-off-by: David Howells <dhowells@redhat.com>
This commit is contained in:
David Howells 2018-10-04 09:32:28 +01:00
parent 66be646bd9
commit 46894a1359
5 changed files with 32 additions and 36 deletions
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29
fs/afs/addr_list.c
View File

@ -232,7 +232,7 @@ struct afs_addr_list *afs_dns_query(struct afs_cell *cell, time64_t *_expiry)
*/
void afs_merge_fs_addr4(struct afs_addr_list *alist, __be32 xdr, u16 port)
{
struct sockaddr_in6 *p;
struct sockaddr_rxrpc *srx;
u32 addr = ntohl(xdr);
int i;
@ -240,9 +240,9 @@ void afs_merge_fs_addr4(struct afs_addr_list *alist, __be32 xdr, u16 port)
return;
for (i = 0; i < alist->nr_ipv4; i++) {
struct sockaddr_in6 *a = &alist->addrs[i].transport.sin6;
u32 a_addr = ntohl(a->sin6_addr.s6_addr32[3]);
u16 a_port = ntohs(a->sin6_port);
struct sockaddr_in *a = &alist->addrs[i].transport.sin;
u32 a_addr = ntohl(a->sin_addr.s_addr);
u16 a_port = ntohs(a->sin_port);
if (addr == a_addr && port == a_port)
return;
@ -257,12 +257,11 @@ void afs_merge_fs_addr4(struct afs_addr_list *alist, __be32 xdr, u16 port)
alist->addrs + i,
sizeof(alist->addrs[0]) * (alist->nr_addrs - i));
p = &alist->addrs[i].transport.sin6;
p->sin6_port = htons(port);
p->sin6_addr.s6_addr32[0] = 0;
p->sin6_addr.s6_addr32[1] = 0;
p->sin6_addr.s6_addr32[2] = htonl(0xffff);
p->sin6_addr.s6_addr32[3] = xdr;
srx = &alist->addrs[i];
srx->transport_len = sizeof(srx->transport.sin);
srx->transport.sin.sin_family = AF_INET;
srx->transport.sin.sin_port = htons(port);
srx->transport.sin.sin_addr.s_addr = xdr;
alist->nr_ipv4++;
alist->nr_addrs++;
}
@ -272,7 +271,7 @@ void afs_merge_fs_addr4(struct afs_addr_list *alist, __be32 xdr, u16 port)
*/
void afs_merge_fs_addr6(struct afs_addr_list *alist, __be32 *xdr, u16 port)
{
struct sockaddr_in6 *p;
struct sockaddr_rxrpc *srx;
int i, diff;
if (alist->nr_addrs >= alist->max_addrs)
@ -296,9 +295,11 @@ void afs_merge_fs_addr6(struct afs_addr_list *alist, __be32 *xdr, u16 port)
alist->addrs + i,
sizeof(alist->addrs[0]) * (alist->nr_addrs - i));
p = &alist->addrs[i].transport.sin6;
p->sin6_port = htons(port);
memcpy(&p->sin6_addr, xdr, 16);
srx = &alist->addrs[i];
srx->transport_len = sizeof(srx->transport.sin6);
srx->transport.sin6.sin6_family = AF_INET6;
srx->transport.sin6.sin6_port = htons(port);
memcpy(&srx->transport.sin6.sin6_addr, xdr, 16);
alist->nr_addrs++;
}

3
net/rxrpc/af_rxrpc.c
View File

@ -97,7 +97,8 @@ static int rxrpc_validate_address(struct rxrpc_sock *rx,
srx->transport_len > len)
return -EINVAL;
if (srx->transport.family != rx->family)
if (srx->transport.family != rx->family &&
srx->transport.family == AF_INET && rx->family != AF_INET6)
return -EAFNOSUPPORT;
switch (srx->transport.family) {

5
net/rxrpc/conn_object.c
View File

@ -89,8 +89,9 @@ struct rxrpc_connection *rxrpc_find_connection_rcu(struct rxrpc_local *local,
if (rxrpc_extract_addr_from_skb(local, &srx, skb) < 0)
goto not_found;
/* We may have to handle mixing IPv4 and IPv6 */
if (srx.transport.family != local->srx.transport.family) {
if (srx.transport.family != local->srx.transport.family &&
(srx.transport.family == AF_INET &&
local->srx.transport.family != AF_INET6)) {
pr_warn_ratelimited("AF_RXRPC: Protocol mismatch %u not %u\n",
srx.transport.family,
local->srx.transport.family);

12
net/rxrpc/peer_event.c
View File

@ -47,6 +47,8 @@ static struct rxrpc_peer *rxrpc_lookup_peer_icmp_rcu(struct rxrpc_local *local,
*/
switch (srx->transport.family) {
case AF_INET:
srx->transport_len = sizeof(srx->transport.sin);
srx->transport.family = AF_INET;
srx->transport.sin.sin_port = serr->port;
switch (serr->ee.ee_origin) {
case SO_EE_ORIGIN_ICMP:
@ -70,20 +72,20 @@ static struct rxrpc_peer *rxrpc_lookup_peer_icmp_rcu(struct rxrpc_local *local,
#ifdef CONFIG_AF_RXRPC_IPV6
case AF_INET6:
srx->transport.sin6.sin6_port = serr->port;
switch (serr->ee.ee_origin) {
case SO_EE_ORIGIN_ICMP6:
_net("Rx ICMP6");
srx->transport.sin6.sin6_port = serr->port;
memcpy(&srx->transport.sin6.sin6_addr,
skb_network_header(skb) + serr->addr_offset,
sizeof(struct in6_addr));
break;
case SO_EE_ORIGIN_ICMP:
_net("Rx ICMP on v6 sock");
srx->transport.sin6.sin6_addr.s6_addr32[0] = 0;
srx->transport.sin6.sin6_addr.s6_addr32[1] = 0;
srx->transport.sin6.sin6_addr.s6_addr32[2] = htonl(0xffff);
memcpy(srx->transport.sin6.sin6_addr.s6_addr + 12,
srx->transport_len = sizeof(srx->transport.sin);
srx->transport.family = AF_INET;
srx->transport.sin.sin_port = serr->port;
memcpy(&srx->transport.sin.sin_addr,
skb_network_header(skb) + serr->addr_offset,
sizeof(struct in_addr));
break;

9
net/rxrpc/utils.c
View File

@ -25,20 +25,11 @@ int rxrpc_extract_addr_from_skb(struct rxrpc_local *local,
switch (ntohs(skb->protocol)) {
case ETH_P_IP:
if (local->srx.transport.family == AF_INET6) {
srx->transport_type = SOCK_DGRAM;
srx->transport_len = sizeof(srx->transport.sin6);
srx->transport.sin6.sin6_family = AF_INET6;
srx->transport.sin6.sin6_port = udp_hdr(skb)->source;
srx->transport.sin6.sin6_addr.s6_addr32[2] = htonl(0xffff);
srx->transport.sin6.sin6_addr.s6_addr32[3] = ip_hdr(skb)->saddr;
} else {
srx->transport_type = SOCK_DGRAM;
srx->transport_len = sizeof(srx->transport.sin);
srx->transport.sin.sin_family = AF_INET;
srx->transport.sin.sin_port = udp_hdr(skb)->source;
srx->transport.sin.sin_addr.s_addr = ip_hdr(skb)->saddr;
}
return 0;
#ifdef CONFIG_AF_RXRPC_IPV6