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author | Richard Alpe <richard.alpe@ericsson.com> | 2014-11-20 09:29:07 (GMT) |
---|---|---|
committer | David S. Miller <davem@davemloft.net> | 2014-11-21 20:01:29 (GMT) |
commit | 0655f6a8635b1b66f2434d5556b1044c14b1ccaf (patch) | |
tree | 6c5080bcfb237f7718dee9dbc91a49b564556d43 /net/tipc/link.c | |
parent | 7cc76f51508219a74dca835745e4f84393820017 (diff) | |
download | linux-0655f6a8635b1b66f2434d5556b1044c14b1ccaf.tar.xz |
tipc: add bearer disable/enable to new netlink api
A new netlink API for tipc that can disable or enable a tipc bearer.
The new API is separated from the old API because of a bug in the
user space client (tipc-config). The problem is that older versions
of tipc-config has a very low receive limit and adding commands to
the legacy genl_opts struct causes the ctrl_getfamily() response
message to grow, subsequently breaking the tool.
The new API utilizes netlink policies for input validation. Where the
top-level netlink attributes are tipc-logical entities, like bearer.
The top level entities then contain nested attributes. In this case
a name, nested link properties and a domain.
Netlink commands implemented in this patch:
TIPC_NL_BEARER_ENABLE
TIPC_NL_BEARER_DISABLE
Netlink logical layout of bearer enable message:
-> bearer
-> name
[ -> domain ]
[
-> properties
-> priority
]
Netlink logical layout of bearer disable message:
-> bearer
-> name
Signed-off-by: Richard Alpe <richard.alpe@ericsson.com>
Reviewed-by: Erik Hugne <erik.hugne@ericsson.com>
Reviewed-by: Jon Maloy <jon.maloy@ericsson.com>
Acked-by: Ying Xue <ying.xue@windriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/tipc/link.c')
-rw-r--r-- | net/tipc/link.c | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/net/tipc/link.c b/net/tipc/link.c index 7cf8004..e7f3650 100644 --- a/net/tipc/link.c +++ b/net/tipc/link.c @@ -40,6 +40,7 @@ #include "name_distr.h" #include "discover.h" #include "config.h" +#include "netlink.h" #include <linux/pkt_sched.h> @@ -50,6 +51,14 @@ static const char *link_co_err = "Link changeover error, "; static const char *link_rst_msg = "Resetting link "; static const char *link_unk_evt = "Unknown link event "; +/* Properties valid for media, bearar and link */ +static const struct nla_policy tipc_nl_prop_policy[TIPC_NLA_PROP_MAX + 1] = { + [TIPC_NLA_PROP_UNSPEC] = { .type = NLA_UNSPEC }, + [TIPC_NLA_PROP_PRIO] = { .type = NLA_U32 }, + [TIPC_NLA_PROP_TOL] = { .type = NLA_U32 }, + [TIPC_NLA_PROP_WIN] = { .type = NLA_U32 } +}; + /* * Out-of-range value for link session numbers */ @@ -2376,3 +2385,41 @@ static void link_print(struct tipc_link *l_ptr, const char *str) else pr_cont("\n"); } + +/* Parse and validate nested (link) properties valid for media, bearer and link + */ +int tipc_nl_parse_link_prop(struct nlattr *prop, struct nlattr *props[]) +{ + int err; + + err = nla_parse_nested(props, TIPC_NLA_PROP_MAX, prop, + tipc_nl_prop_policy); + if (err) + return err; + + if (props[TIPC_NLA_PROP_PRIO]) { + u32 prio; + + prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]); + if (prio > TIPC_MAX_LINK_PRI) + return -EINVAL; + } + + if (props[TIPC_NLA_PROP_TOL]) { + u32 tol; + + tol = nla_get_u32(props[TIPC_NLA_PROP_TOL]); + if ((tol < TIPC_MIN_LINK_TOL) || (tol > TIPC_MAX_LINK_TOL)) + return -EINVAL; + } + + if (props[TIPC_NLA_PROP_WIN]) { + u32 win; + + win = nla_get_u32(props[TIPC_NLA_PROP_WIN]); + if ((win < TIPC_MIN_LINK_WIN) || (win > TIPC_MAX_LINK_WIN)) + return -EINVAL; + } + + return 0; +} |