ipv6: make IPV6_RECVPKTINFO work for ipv4 datagrams

We currently don't report IPV6_RECVPKTINFO in cmsg access ancillary data
for IPv4 datagrams on IPv6 sockets.

This patch splits the ip6_datagram_recv_ctl into two functions, one
which handles both protocol families, AF_INET and AF_INET6, while the
ip6_datagram_recv_specific_ctl only handles IPv6 cmsg data.

ip6_datagram_recv_*_ctl never reported back any errors, so we can make
them return void. Also provide a helper for protocols which don't offer dual
personality to further use ip6_datagram_recv_ctl, which is exported to
modules.

I needed to shuffle the code for ping around a bit to make it easier to
implement dual personality for ping ipv6 sockets in future.

Reported-by: Gert Doering <gert@space.net>
Signed-off-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/include/linux/ipv6.h b/include/linux/ipv6.h
index 1084304..2faef33 100644 (file)
--- a/include/linux/ipv6.h
+++ b/include/linux/ipv6.h
@@ -284,6 +284,8 @@ static inline void inet_sk_copy_descendant(struct sock *sk_to,
 
 #define __ipv6_only_sock(sk)   (inet6_sk(sk)->ipv6only)
 #define ipv6_only_sock(sk)     ((sk)->sk_family == PF_INET6 && __ipv6_only_sock(sk))
+#define ipv6_sk_rxinfo(sk)     ((sk)->sk_family == PF_INET6 && \
+                                inet6_sk(sk)->rxopt.bits.rxinfo)
 
 static inline const struct in6_addr *inet6_rcv_saddr(const struct sock *sk)
 {
@@ -300,6 +302,7 @@ static inline int inet_v6_ipv6only(const struct sock *sk)
 #else
 #define __ipv6_only_sock(sk)   0
 #define ipv6_only_sock(sk)     0
+#define ipv6_sk_rxinfo(sk)     0
 
 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
 {

diff --git a/include/net/ip.h b/include/net/ip.h
index 7876e3b..23be0fd 100644 (file)
--- a/include/net/ip.h
+++ b/include/net/ip.h
@@ -63,6 +63,7 @@ struct ipcm_cookie {
 };
 
 #define IPCB(skb) ((struct inet_skb_parm*)((skb)->cb))
+#define PKTINFO_SKB_CB(skb) ((struct in_pktinfo *)((skb)->cb))
 
 struct ip_ra_chain {
        struct ip_ra_chain __rcu *next;

diff --git a/include/net/ping.h b/include/net/ping.h
index 7601365..026479b 100644 (file)
--- a/include/net/ping.h
+++ b/include/net/ping.h
@@ -33,8 +33,12 @@
 struct pingv6_ops {
        int (*ipv6_recv_error)(struct sock *sk, struct msghdr *msg, int len,
                               int *addr_len);
-       int (*ip6_datagram_recv_ctl)(struct sock *sk, struct msghdr *msg,
-                                    struct sk_buff *skb);
+       void (*ip6_datagram_recv_common_ctl)(struct sock *sk,
+                                            struct msghdr *msg,
+                                            struct sk_buff *skb);
+       void (*ip6_datagram_recv_specific_ctl)(struct sock *sk,
+                                              struct msghdr *msg,
+                                              struct sk_buff *skb);
        int (*icmpv6_err_convert)(u8 type, u8 code, int *err);
        void (*ipv6_icmp_error)(struct sock *sk, struct sk_buff *skb, int err,
                                __be16 port, u32 info, u8 *payload);

diff --git a/include/net/transp_v6.h b/include/net/transp_v6.h
index 48660e5..b927413 100644 (file)
--- a/include/net/transp_v6.h
+++ b/include/net/transp_v6.h
@@ -32,8 +32,13 @@ void tcpv6_exit(void);
 
 int udpv6_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len);
 
-int ip6_datagram_recv_ctl(struct sock *sk, struct msghdr *msg,
-                         struct sk_buff *skb);
+/* this does all the common and the specific ctl work */
+void ip6_datagram_recv_ctl(struct sock *sk, struct msghdr *msg,
+                          struct sk_buff *skb);
+void ip6_datagram_recv_common_ctl(struct sock *sk, struct msghdr *msg,
+                                 struct sk_buff *skb);
+void ip6_datagram_recv_specific_ctl(struct sock *sk, struct msghdr *msg,
+                                   struct sk_buff *skb);
 
 int ip6_datagram_send_ctl(struct net *net, struct sock *sk, struct msghdr *msg,
                          struct flowi6 *fl6, struct ipv6_txoptions *opt,

diff --git a/net/ipv4/ip_sockglue.c b/net/ipv4/ip_sockglue.c
index 22f15eb..580dd96 100644 (file)
--- a/net/ipv4/ip_sockglue.c
+++ b/net/ipv4/ip_sockglue.c
@@ -56,7 +56,6 @@
 /*
  *     SOL_IP control messages.
  */
-#define PKTINFO_SKB_CB(__skb) ((struct in_pktinfo *)((__skb)->cb))
 
 static void ip_cmsg_recv_pktinfo(struct msghdr *msg, struct sk_buff *skb)
 {
@@ -1055,9 +1054,10 @@ e_inval:
 void ipv4_pktinfo_prepare(const struct sock *sk, struct sk_buff *skb)
 {
        struct in_pktinfo *pktinfo = PKTINFO_SKB_CB(skb);
+       bool prepare = (inet_sk(sk)->cmsg_flags & IP_CMSG_PKTINFO) ||
+                      ipv6_sk_rxinfo(sk);
 
-       if ((inet_sk(sk)->cmsg_flags & IP_CMSG_PKTINFO) &&
-           skb_rtable(skb)) {
+       if (prepare && skb_rtable(skb)) {
                pktinfo->ipi_ifindex = inet_iif(skb);
                pktinfo->ipi_spec_dst.s_addr = fib_compute_spec_dst(skb);
        } else {

diff --git a/net/ipv4/ping.c b/net/ipv4/ping.c
index e09e883..4a9e426 100644 (file)
--- a/net/ipv4/ping.c
+++ b/net/ipv4/ping.c
@@ -906,7 +906,12 @@ int ping_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
                }
 
                if (inet6_sk(sk)->rxopt.all)
-                       pingv6_ops.ip6_datagram_recv_ctl(sk, msg, skb);
+                       pingv6_ops.ip6_datagram_recv_common_ctl(sk, msg, skb);
+               if (skb->protocol == htons(ETH_P_IPV6) &&
+                   inet6_sk(sk)->rxopt.all)
+                       pingv6_ops.ip6_datagram_recv_specific_ctl(sk, msg, skb);
+               else if (skb->protocol == htons(ETH_P_IP) && isk->cmsg_flags)
+                       ip_cmsg_recv(msg, skb);
 #endif
        } else {
                BUG();

diff --git a/net/ipv6/datagram.c b/net/ipv6/datagram.c
index bce73cb..cd8699b 100644 (file)
--- a/net/ipv6/datagram.c
+++ b/net/ipv6/datagram.c
@@ -377,10 +377,12 @@ int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len)
                sin->sin6_family = AF_INET6;
                sin->sin6_flowinfo = 0;
                sin->sin6_port = 0;
+               if (np->rxopt.all)
+                       ip6_datagram_recv_common_ctl(sk, msg, skb);
                if (skb->protocol == htons(ETH_P_IPV6)) {
                        sin->sin6_addr = ipv6_hdr(skb)->saddr;
                        if (np->rxopt.all)
-                               ip6_datagram_recv_ctl(sk, msg, skb);
+                               ip6_datagram_recv_specific_ctl(sk, msg, skb);
                        sin->sin6_scope_id =
                                ipv6_iface_scope_id(&sin->sin6_addr,
                                                    IP6CB(skb)->iif);
@@ -471,20 +473,34 @@ out:
 }
 
 
-int ip6_datagram_recv_ctl(struct sock *sk, struct msghdr *msg,
-                         struct sk_buff *skb)
+void ip6_datagram_recv_common_ctl(struct sock *sk, struct msghdr *msg,
+                                struct sk_buff *skb)
 {
        struct ipv6_pinfo *np = inet6_sk(sk);
-       struct inet6_skb_parm *opt = IP6CB(skb);
-       unsigned char *nh = skb_network_header(skb);
+       bool is_ipv6 = skb->protocol == htons(ETH_P_IPV6);
 
        if (np->rxopt.bits.rxinfo) {
                struct in6_pktinfo src_info;
 
-               src_info.ipi6_ifindex = opt->iif;
-               src_info.ipi6_addr = ipv6_hdr(skb)->daddr;
+               if (is_ipv6) {
+                       src_info.ipi6_ifindex = IP6CB(skb)->iif;
+                       src_info.ipi6_addr = ipv6_hdr(skb)->daddr;
+               } else {
+                       src_info.ipi6_ifindex =
+                               PKTINFO_SKB_CB(skb)->ipi_ifindex;
+                       ipv6_addr_set_v4mapped(ip_hdr(skb)->daddr,
+                                              &src_info.ipi6_addr);
+               }
                put_cmsg(msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
        }
+}
+
+void ip6_datagram_recv_specific_ctl(struct sock *sk, struct msghdr *msg,
+                                   struct sk_buff *skb)
+{
+       struct ipv6_pinfo *np = inet6_sk(sk);
+       struct inet6_skb_parm *opt = IP6CB(skb);
+       unsigned char *nh = skb_network_header(skb);
 
        if (np->rxopt.bits.rxhlim) {
                int hlim = ipv6_hdr(skb)->hop_limit;
@@ -602,7 +618,13 @@ int ip6_datagram_recv_ctl(struct sock *sk, struct msghdr *msg,
                        put_cmsg(msg, SOL_IPV6, IPV6_ORIGDSTADDR, sizeof(sin6), &sin6);
                }
        }
-       return 0;
+}
+
+void ip6_datagram_recv_ctl(struct sock *sk, struct msghdr *msg,
+                         struct sk_buff *skb)
+{
+       ip6_datagram_recv_common_ctl(sk, msg, skb);
+       ip6_datagram_recv_specific_ctl(sk, msg, skb);
 }
 EXPORT_SYMBOL_GPL(ip6_datagram_recv_ctl);
 

diff --git a/net/ipv6/ipv6_sockglue.c b/net/ipv6/ipv6_sockglue.c
index 7024a87..0a00f44 100644 (file)
--- a/net/ipv6/ipv6_sockglue.c
+++ b/net/ipv6/ipv6_sockglue.c
@@ -1002,10 +1002,8 @@ static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
                release_sock(sk);
 
                if (skb) {
-                       int err = ip6_datagram_recv_ctl(sk, &msg, skb);
+                       ip6_datagram_recv_ctl(sk, &msg, skb);
                        kfree_skb(skb);
-                       if (err)
-                               return err;
                } else {
                        if (np->rxopt.bits.rxinfo) {
                                struct in6_pktinfo src_info;

diff --git a/net/ipv6/ping.c b/net/ipv6/ping.c
index cd71f3a..94a3d04 100644 (file)
--- a/net/ipv6/ping.c
+++ b/net/ipv6/ping.c
@@ -62,10 +62,9 @@ static int dummy_ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len,
 {
        return -EAFNOSUPPORT;
 }
-static int dummy_ip6_datagram_recv_ctl(struct sock *sk, struct msghdr *msg,
+static void dummy_ip6_datagram_recv_ctl(struct sock *sk, struct msghdr *msg,
                                       struct sk_buff *skb)
 {
-       return -EAFNOSUPPORT;
 }
 static int dummy_icmpv6_err_convert(u8 type, u8 code, int *err)
 {
@@ -254,7 +253,9 @@ int __init pingv6_init(void)
                return ret;
 #endif
        pingv6_ops.ipv6_recv_error = ipv6_recv_error;
-       pingv6_ops.ip6_datagram_recv_ctl = ip6_datagram_recv_ctl;
+       pingv6_ops.ip6_datagram_recv_common_ctl = ip6_datagram_recv_common_ctl;
+       pingv6_ops.ip6_datagram_recv_specific_ctl =
+               ip6_datagram_recv_specific_ctl;
        pingv6_ops.icmpv6_err_convert = icmpv6_err_convert;
        pingv6_ops.ipv6_icmp_error = ipv6_icmp_error;
        pingv6_ops.ipv6_chk_addr = ipv6_chk_addr;
@@ -267,7 +268,8 @@ int __init pingv6_init(void)
 void pingv6_exit(void)
 {
        pingv6_ops.ipv6_recv_error = dummy_ipv6_recv_error;
-       pingv6_ops.ip6_datagram_recv_ctl = dummy_ip6_datagram_recv_ctl;
+       pingv6_ops.ip6_datagram_recv_common_ctl = dummy_ip6_datagram_recv_ctl;
+       pingv6_ops.ip6_datagram_recv_specific_ctl = dummy_ip6_datagram_recv_ctl;
        pingv6_ops.icmpv6_err_convert = dummy_icmpv6_err_convert;
        pingv6_ops.ipv6_icmp_error = dummy_ipv6_icmp_error;
        pingv6_ops.ipv6_chk_addr = dummy_ipv6_chk_addr;

diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
index 233c3ab..1e586d9 100644 (file)
--- a/net/ipv6/udp.c
+++ b/net/ipv6/udp.c
@@ -477,12 +477,16 @@ try_again:
                }
                *addr_len = sizeof(*sin6);
        }
+
+       if (np->rxopt.all)
+               ip6_datagram_recv_common_ctl(sk, msg, skb);
+
        if (is_udp4) {
                if (inet->cmsg_flags)
                        ip_cmsg_recv(msg, skb);
        } else {
                if (np->rxopt.all)
-                       ip6_datagram_recv_ctl(sk, msg, skb);
+                       ip6_datagram_recv_specific_ctl(sk, msg, skb);
        }
 
        err = copied;