ipv6: add a flag to get the flow label used remotly

This information is already available via IPV6_FLOWINFO
of IPV6_2292PKTOPTIONS, and them a filtering to get the flow label
information. But it is probably logical and easier for users to add this
here, and to control both sent/received flow label values with the
IPV6_FLOWLABEL_MGR option.

Signed-off-by: Florent Fourcot <florent.fourcot@enst-bretagne.fr>
Acked-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/include/net/ipv6.h b/include/net/ipv6.h
index 6d80f51..78d3d51 100644 (file)
--- a/include/net/ipv6.h
+++ b/include/net/ipv6.h
@@ -253,7 +253,8 @@ struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions *opt_space,
                                         struct ipv6_txoptions *fopt);
 void fl6_free_socklist(struct sock *sk);
 int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen);
-int ipv6_flowlabel_opt_get(struct sock *sk, struct in6_flowlabel_req *freq);
+int ipv6_flowlabel_opt_get(struct sock *sk, struct in6_flowlabel_req *freq,
+                          int flags);
 int ip6_flowlabel_init(void);
 void ip6_flowlabel_cleanup(void);
 

diff --git a/include/uapi/linux/in6.h b/include/uapi/linux/in6.h
index 02c0cd6..633b93c 100644 (file)
--- a/include/uapi/linux/in6.h
+++ b/include/uapi/linux/in6.h
@@ -86,6 +86,7 @@ struct in6_flowlabel_req {
 #define IPV6_FL_F_CREATE       1
 #define IPV6_FL_F_EXCL         2
 #define IPV6_FL_F_REFLECT      4
+#define IPV6_FL_F_REMOTE       8
 
 #define IPV6_FL_S_NONE         0
 #define IPV6_FL_S_EXCL         1

diff --git a/net/ipv6/ip6_flowlabel.c b/net/ipv6/ip6_flowlabel.c
index 55823f1..01bf252 100644 (file)
--- a/net/ipv6/ip6_flowlabel.c
+++ b/net/ipv6/ip6_flowlabel.c
@@ -481,11 +481,17 @@ static inline void fl_link(struct ipv6_pinfo *np, struct ipv6_fl_socklist *sfl,
        spin_unlock_bh(&ip6_sk_fl_lock);
 }
 
-int ipv6_flowlabel_opt_get(struct sock *sk, struct in6_flowlabel_req *freq)
+int ipv6_flowlabel_opt_get(struct sock *sk, struct in6_flowlabel_req *freq,
+                          int flags)
 {
        struct ipv6_pinfo *np = inet6_sk(sk);
        struct ipv6_fl_socklist *sfl;
 
+       if (flags & IPV6_FL_F_REMOTE) {
+               freq->flr_label = np->rcv_flowinfo & IPV6_FLOWLABEL_MASK;
+               return 0;
+       }
+
        if (np->repflow) {
                freq->flr_label = np->flow_label;
                return 0;

diff --git a/net/ipv6/ipv6_sockglue.c b/net/ipv6/ipv6_sockglue.c
index 2855b00..7024a87 100644 (file)
--- a/net/ipv6/ipv6_sockglue.c
+++ b/net/ipv6/ipv6_sockglue.c
@@ -1221,6 +1221,7 @@ static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
        case IPV6_FLOWLABEL_MGR:
        {
                struct in6_flowlabel_req freq;
+               int flags;
 
                if (len < sizeof(freq))
                        return -EINVAL;
@@ -1232,9 +1233,11 @@ static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
                        return -EINVAL;
 
                len = sizeof(freq);
+               flags = freq.flr_flags;
+
                memset(&freq, 0, sizeof(freq));
 
-               val = ipv6_flowlabel_opt_get(sk, &freq);
+               val = ipv6_flowlabel_opt_get(sk, &freq, flags);
                if (val < 0)
                        return val;