IPv6: Add dontfrag argument to relevant functions

Add dontfrag argument to relevant functions for
IPV6_DONTFRAG support, as well as allowing the value
to be passed-in via ancillary cmsg data.

Signed-off-by: Brian Haley <brian.haley@hp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/include/net/ipv6.h b/include/net/ipv6.h
index b1d8db9..7ab6323 100644 (file)
--- a/include/net/ipv6.h
+++ b/include/net/ipv6.h
@@ -503,7 +503,8 @@ extern int                  ip6_append_data(struct sock *sk,
                                                struct ipv6_txoptions *opt,
                                                struct flowi *fl,
                                                struct rt6_info *rt,
-                                               unsigned int flags);
+                                               unsigned int flags,
+                                               int dontfrag);
 
 extern int                     ip6_push_pending_frames(struct sock *sk);
 

diff --git a/include/net/transp_v6.h b/include/net/transp_v6.h
index d65381c..42a0eb6 100644 (file)
--- a/include/net/transp_v6.h
+++ b/include/net/transp_v6.h
@@ -44,7 +44,8 @@ extern int                    datagram_send_ctl(struct net *net,
                                                  struct msghdr *msg,
                                                  struct flowi *fl,
                                                  struct ipv6_txoptions *opt,
-                                                 int *hlimit, int *tclass);
+                                                 int *hlimit, int *tclass,
+                                                 int *dontfrag);
 
 #define                LOOPBACK4_IPV6          cpu_to_be32(0x7f000006)
 

diff --git a/net/ipv6/datagram.c b/net/ipv6/datagram.c
index 622dc79..f5076d3 100644 (file)
--- a/net/ipv6/datagram.c
+++ b/net/ipv6/datagram.c
@@ -497,7 +497,7 @@ int datagram_recv_ctl(struct sock *sk, struct msghdr *msg, struct sk_buff *skb)
 int datagram_send_ctl(struct net *net,
                      struct msghdr *msg, struct flowi *fl,
                      struct ipv6_txoptions *opt,
-                     int *hlimit, int *tclass)
+                     int *hlimit, int *tclass, int *dontfrag)
 {
        struct in6_pktinfo *src_info;
        struct cmsghdr *cmsg;
@@ -737,6 +737,25 @@ int datagram_send_ctl(struct net *net,
 
                        break;
                    }
+
+               case IPV6_DONTFRAG:
+                   {
+                       int df;
+
+                       err = -EINVAL;
+                       if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) {
+                               goto exit_f;
+                       }
+
+                       df = *(int *)CMSG_DATA(cmsg);
+                       if (df < 0 || df > 1)
+                               goto exit_f;
+
+                       err = 0;
+                       *dontfrag = df;
+
+                       break;
+                   }
                default:
                        LIMIT_NETDEBUG(KERN_DEBUG "invalid cmsg type: %d\n",
                                       cmsg->cmsg_type);

diff --git a/net/ipv6/icmp.c b/net/ipv6/icmp.c
index 12d2fa4..ce79929 100644 (file)
--- a/net/ipv6/icmp.c
+++ b/net/ipv6/icmp.c
@@ -481,7 +481,7 @@ route_done:
                              len + sizeof(struct icmp6hdr),
                              sizeof(struct icmp6hdr), hlimit,
                              np->tclass, NULL, &fl, (struct rt6_info*)dst,
-                             MSG_DONTWAIT);
+                             MSG_DONTWAIT, np->dontfrag);
        if (err) {
                ICMP6_INC_STATS_BH(net, idev, ICMP6_MIB_OUTMSGS);
                ip6_flush_pending_frames(sk);
@@ -561,7 +561,8 @@ static void icmpv6_echo_reply(struct sk_buff *skb)
 
        err = ip6_append_data(sk, icmpv6_getfrag, &msg, skb->len + sizeof(struct icmp6hdr),
                                sizeof(struct icmp6hdr), hlimit, np->tclass, NULL, &fl,
-                               (struct rt6_info*)dst, MSG_DONTWAIT);
+                               (struct rt6_info*)dst, MSG_DONTWAIT,
+                               np->dontfrag);
 
        if (err) {
                ICMP6_INC_STATS_BH(net, idev, ICMP6_MIB_OUTMSGS);

diff --git a/net/ipv6/ip6_flowlabel.c b/net/ipv6/ip6_flowlabel.c
index 14e2321..1365468 100644 (file)
--- a/net/ipv6/ip6_flowlabel.c
+++ b/net/ipv6/ip6_flowlabel.c
@@ -360,7 +360,8 @@ fl_create(struct net *net, struct in6_flowlabel_req *freq, char __user *optval,
                msg.msg_control = (void*)(fl->opt+1);
                flowi.oif = 0;
 
-               err = datagram_send_ctl(net, &msg, &flowi, fl->opt, &junk, &junk);
+               err = datagram_send_ctl(net, &msg, &flowi, fl->opt, &junk,
+                                       &junk, &junk);
                if (err)
                        goto done;
                err = -EINVAL;

diff --git a/net/ipv6/ip6_output.c b/net/ipv6/ip6_output.c
index 263d4cf..54d43dd 100644 (file)
--- a/net/ipv6/ip6_output.c
+++ b/net/ipv6/ip6_output.c
@@ -1105,7 +1105,7 @@ int ip6_append_data(struct sock *sk, int getfrag(void *from, char *to,
        int offset, int len, int odd, struct sk_buff *skb),
        void *from, int length, int transhdrlen,
        int hlimit, int tclass, struct ipv6_txoptions *opt, struct flowi *fl,
-       struct rt6_info *rt, unsigned int flags)
+       struct rt6_info *rt, unsigned int flags, int dontfrag)
 {
        struct inet_sock *inet = inet_sk(sk);
        struct ipv6_pinfo *np = inet6_sk(sk);

diff --git a/net/ipv6/ipv6_sockglue.c b/net/ipv6/ipv6_sockglue.c
index 2bf9eda..bd43f01 100644 (file)
--- a/net/ipv6/ipv6_sockglue.c
+++ b/net/ipv6/ipv6_sockglue.c
@@ -458,7 +458,8 @@ sticky_done:
                msg.msg_controllen = optlen;
                msg.msg_control = (void*)(opt+1);
 
-               retv = datagram_send_ctl(net, &msg, &fl, opt, &junk, &junk);
+               retv = datagram_send_ctl(net, &msg, &fl, opt, &junk, &junk,
+                                        &junk);
                if (retv)
                        goto done;
 update:

diff --git a/net/ipv6/raw.c b/net/ipv6/raw.c
index 8763b1a..44a84ea 100644 (file)
--- a/net/ipv6/raw.c
+++ b/net/ipv6/raw.c
@@ -733,6 +733,7 @@ static int rawv6_sendmsg(struct kiocb *iocb, struct sock *sk,
        int addr_len = msg->msg_namelen;
        int hlimit = -1;
        int tclass = -1;
+       int dontfrag = -1;
        u16 proto;
        int err;
 
@@ -811,7 +812,8 @@ static int rawv6_sendmsg(struct kiocb *iocb, struct sock *sk,
                memset(opt, 0, sizeof(struct ipv6_txoptions));
                opt->tot_len = sizeof(struct ipv6_txoptions);
 
-               err = datagram_send_ctl(sock_net(sk), msg, &fl, opt, &hlimit, &tclass);
+               err = datagram_send_ctl(sock_net(sk), msg, &fl, opt, &hlimit,
+                                       &tclass, &dontfrag);
                if (err < 0) {
                        fl6_sock_release(flowlabel);
                        return err;
@@ -880,6 +882,9 @@ static int rawv6_sendmsg(struct kiocb *iocb, struct sock *sk,
        if (tclass < 0)
                tclass = np->tclass;
 
+       if (dontfrag < 0)
+               dontfrag = np->dontfrag;
+
        if (msg->msg_flags&MSG_CONFIRM)
                goto do_confirm;
 
@@ -890,7 +895,7 @@ back_from_confirm:
                lock_sock(sk);
                err = ip6_append_data(sk, ip_generic_getfrag, msg->msg_iov,
                        len, 0, hlimit, tclass, opt, &fl, (struct rt6_info*)dst,
-                       msg->msg_flags);
+                       msg->msg_flags, dontfrag);
 
                if (err)
                        ip6_flush_pending_frames(sk);

diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
index 92bf903..39e3665 100644 (file)
--- a/net/ipv6/udp.c
+++ b/net/ipv6/udp.c
@@ -919,6 +919,7 @@ int udpv6_sendmsg(struct kiocb *iocb, struct sock *sk,
        int ulen = len;
        int hlimit = -1;
        int tclass = -1;
+       int dontfrag = -1;
        int corkreq = up->corkflag || msg->msg_flags&MSG_MORE;
        int err;
        int connected = 0;
@@ -1049,7 +1050,8 @@ do_udp_sendmsg:
                memset(opt, 0, sizeof(struct ipv6_txoptions));
                opt->tot_len = sizeof(*opt);
 
-               err = datagram_send_ctl(sock_net(sk), msg, &fl, opt, &hlimit, &tclass);
+               err = datagram_send_ctl(sock_net(sk), msg, &fl, opt, &hlimit,
+                                       &tclass, &dontfrag);
                if (err < 0) {
                        fl6_sock_release(flowlabel);
                        return err;
@@ -1120,6 +1122,9 @@ do_udp_sendmsg:
        if (tclass < 0)
                tclass = np->tclass;
 
+       if (dontfrag < 0)
+               dontfrag = np->dontfrag;
+
        if (msg->msg_flags&MSG_CONFIRM)
                goto do_confirm;
 back_from_confirm:
@@ -1143,7 +1148,7 @@ do_append_data:
        err = ip6_append_data(sk, getfrag, msg->msg_iov, ulen,
                sizeof(struct udphdr), hlimit, tclass, opt, &fl,
                (struct rt6_info*)dst,
-               corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags);
+               corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags, dontfrag);
        if (err)
                udp_v6_flush_pending_frames(sk);
        else if (!corkreq)