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authorDaniel Borkmann <dborkman@redhat.com>2015-01-05 23:57:47 +0100
committerDavid S. Miller <davem@davemloft.net>2015-01-05 22:55:24 -0500
commitea697639992d96da98016b8934e68a73876a2264 (patch)
treec04b2007e7294668f40e16091b1a11647497c86e /net/decnet
parentc5c6a8ab45ec0f18733afb4aaade0d4a139d80b3 (diff)
net: tcp: add RTAX_CC_ALGO fib handling
This patch adds the minimum necessary for the RTAX_CC_ALGO congestion control metric to be set up and dumped back to user space. While the internal representation of RTAX_CC_ALGO is handled as a u32 key, we avoided to expose this implementation detail to user space, thus instead, we chose the netlink attribute that is being exchanged between user space to be the actual congestion control algorithm name, similarly as in the setsockopt(2) API in order to allow for maximum flexibility, even for 3rd party modules. It is a bit unfortunate that RTAX_QUICKACK used up a whole RTAX slot as it should have been stored in RTAX_FEATURES instead, we first thought about reusing it for the congestion control key, but it brings more complications and/or confusion than worth it. Joint work with Florian Westphal. Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: Daniel Borkmann <dborkman@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/decnet')
-rw-r--r--net/decnet/dn_fib.c3
-rw-r--r--net/decnet/dn_table.c4
2 files changed, 5 insertions, 2 deletions
diff --git a/net/decnet/dn_fib.c b/net/decnet/dn_fib.c
index d332aefb0846..df4803437888 100644
--- a/net/decnet/dn_fib.c
+++ b/net/decnet/dn_fib.c
@@ -298,7 +298,8 @@ struct dn_fib_info *dn_fib_create_info(const struct rtmsg *r, struct nlattr *att
int type = nla_type(attr);
if (type) {
- if (type > RTAX_MAX || nla_len(attr) < 4)
+ if (type > RTAX_MAX || type == RTAX_CC_ALGO ||
+ nla_len(attr) < 4)
goto err_inval;
fi->fib_metrics[type-1] = nla_get_u32(attr);
diff --git a/net/decnet/dn_table.c b/net/decnet/dn_table.c
index 86e3807052e9..3f19fcbf126d 100644
--- a/net/decnet/dn_table.c
+++ b/net/decnet/dn_table.c
@@ -29,6 +29,7 @@
#include <linux/route.h> /* RTF_xxx */
#include <net/neighbour.h>
#include <net/netlink.h>
+#include <net/tcp.h>
#include <net/dst.h>
#include <net/flow.h>
#include <net/fib_rules.h>
@@ -273,7 +274,8 @@ static inline size_t dn_fib_nlmsg_size(struct dn_fib_info *fi)
size_t payload = NLMSG_ALIGN(sizeof(struct rtmsg))
+ nla_total_size(4) /* RTA_TABLE */
+ nla_total_size(2) /* RTA_DST */
- + nla_total_size(4); /* RTA_PRIORITY */
+ + nla_total_size(4) /* RTA_PRIORITY */
+ + nla_total_size(TCP_CA_NAME_MAX); /* RTAX_CC_ALGO */
/* space for nested metrics */
payload += nla_total_size((RTAX_MAX * nla_total_size(4)));

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