dccp: Set per-connection CCIDs via socket options

With this patch, TX/RX CCIDs can now be changed on a per-connection
basis, which overrides the defaults set by the global sysctl variables
for TX/RX CCIDs.

To make full use of this facility, the remaining patches of this patch
set are needed, which track dependencies and activate negotiated
feature values.

Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 4 insertions, 5 deletions

diff --git a/net/dccp/ackvec.c b/net/dccp/ackvec.c
index 1e8be246ad15..01e4d39fa232 100644
--- a/net/dccp/ackvec.c
+++ b/net/dccp/ackvec.c
@@ -12,7 +12,6 @@
 #include "ackvec.h"
 #include "dccp.h"
 
-#include <linux/dccp.h>
 #include <linux/init.h>
 #include <linux/errno.h>
 #include <linux/kernel.h>
@@ -68,7 +67,7 @@ int dccp_insert_option_ackvec(struct sock *sk, struct sk_buff *skb)
         struct dccp_sock *dp = dccp_sk(sk);
         struct dccp_ackvec *av = dp->dccps_hc_rx_ackvec;
         /* Figure out how many options do we need to represent the ackvec */
-        const u16 nr_opts = DIV_ROUND_UP(av->av_vec_len, DCCP_MAX_ACKVEC_OPT_LEN);
+        const u8 nr_opts = DIV_ROUND_UP(av->av_vec_len, DCCP_SINGLE_OPT_MAXLEN);
         u16 len = av->av_vec_len + 2 * nr_opts, i;
         u32 elapsed_time;
         const unsigned char *tail, *from;
@@ -100,8 +99,8 @@ int dccp_insert_option_ackvec(struct sock *sk, struct sk_buff *skb)
         for (i = 0; i < nr_opts; ++i) {
                 int copylen = len;
 
-                if (len > DCCP_MAX_ACKVEC_OPT_LEN)
-                        copylen = DCCP_MAX_ACKVEC_OPT_LEN;
+                if (len > DCCP_SINGLE_OPT_MAXLEN)
+                        copylen = DCCP_SINGLE_OPT_MAXLEN;
 
                 *to++ = DCCPO_ACK_VECTOR_0;
                 *to++ = copylen + 2;
@@ -432,7 +431,7 @@ found:
 int dccp_ackvec_parse(struct sock *sk, const struct sk_buff *skb,
                       u64 *ackno, const u8 opt, const u8 *value, const u8 len)
 {
-        if (len > DCCP_MAX_ACKVEC_OPT_LEN)
+        if (len > DCCP_SINGLE_OPT_MAXLEN)
                 return -1;
 
         /* dccp_ackvector_print(DCCP_SKB_CB(skb)->dccpd_ack_seq, value, len); */