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net: fib_rules: Add new attribute to set protocol 

For ages iproute2 has used `struct rtmsg` as the ancillary header for
FIB rules and in the process set the protocol value to RTPROT_BOOT.
Until ca56209a66 ("net: Allow a rule to track originating protocol")
the kernel rules code ignored the protocol value sent from userspace
and always returned 0 in notifications. To avoid incompatibility with
existing iproute2, send the protocol as a new attribute.

Fixes: cac56209a6 ("net: Allow a rule to track originating protocol")
Signed-off-by: Donald Sharp <sharpd@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Donald Sharp 2018-02-23 14:01:52 -05:00 committed by David S. Miller
parent cc30c93fa0
commit 1b71af6053
4 changed files with 20 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
drivers/net/vrf.c
View File

@ -1145,6 +1145,7 @@ static inline size_t vrf_fib_rule_nl_size(void)
sz = NLMSG_ALIGN(sizeof(struct fib_rule_hdr));
sz += nla_total_size(sizeof(u8)); /* FRA_L3MDEV */
sz += nla_total_size(sizeof(u32)); /* FRA_PRIORITY */
sz += nla_total_size(sizeof(u8)); /* FRA_PROTOCOL */
return sz;
}
@ -1174,7 +1175,9 @@ static int vrf_fib_rule(const struct net_device *dev, __u8 family, bool add_it)
memset(frh, 0, sizeof(*frh));
frh->family = family;
frh->action = FR_ACT_TO_TBL;
frh->proto = RTPROT_KERNEL;
if (nla_put_u8(skb, FRA_PROTOCOL, RTPROT_KERNEL))
goto nla_put_failure;
if (nla_put_u8(skb, FRA_L3MDEV, 1))
goto nla_put_failure;

3
include/net/fib_rules.h
View File

@ -109,7 +109,8 @@ struct fib_rule_notifier_info {
[FRA_SUPPRESS_IFGROUP] = { .type = NLA_U32 }, \
[FRA_GOTO] = { .type = NLA_U32 }, \
[FRA_L3MDEV] = { .type = NLA_U8 }, \
[FRA_UID_RANGE] = { .len = sizeof(struct fib_rule_uid_range) }
[FRA_UID_RANGE] = { .len = sizeof(struct fib_rule_uid_range) }, \
[FRA_PROTOCOL] = { .type = NLA_U8 }
static inline void fib_rule_get(struct fib_rule *rule)
{

5
include/uapi/linux/fib_rules.h
View File

@ -23,8 +23,8 @@ struct fib_rule_hdr {
__u8 tos;
__u8 table;
__u8 proto;
__u8 res1; /* reserved */
__u8 res1; /* reserved */
__u8 res2; /* reserved */
__u8 action;
__u32 flags;
@ -58,6 +58,7 @@ enum {
FRA_PAD,
FRA_L3MDEV, /* iif or oif is l3mdev goto its table */
FRA_UID_RANGE, /* UID range */
FRA_PROTOCOL, /* Originator of the rule */
__FRA_MAX
};

15
net/core/fib_rules.c
View File

@ -466,11 +466,13 @@ int fib_nl_newrule(struct sk_buff *skb, struct nlmsghdr *nlh,
}
refcount_set(&rule->refcnt, 1);
rule->fr_net = net;
rule->proto = frh->proto;
rule->pref = tb[FRA_PRIORITY] ? nla_get_u32(tb[FRA_PRIORITY])
: fib_default_rule_pref(ops);
rule->proto = tb[FRA_PROTOCOL] ?
nla_get_u8(tb[FRA_PROTOCOL]) : RTPROT_UNSPEC;
if (tb[FRA_IIFNAME]) {
struct net_device *dev;
@ -666,7 +668,8 @@ int fib_nl_delrule(struct sk_buff *skb, struct nlmsghdr *nlh,
}
list_for_each_entry(rule, &ops->rules_list, list) {
if (frh->proto && (frh->proto != rule->proto))
if (tb[FRA_PROTOCOL] &&
(rule->proto != nla_get_u8(tb[FRA_PROTOCOL])))
continue;
if (frh->action && (frh->action != rule->action))
@ -786,7 +789,8 @@ static inline size_t fib_rule_nlmsg_size(struct fib_rules_ops *ops,
+ nla_total_size(4) /* FRA_FWMARK */
+ nla_total_size(4) /* FRA_FWMASK */
+ nla_total_size_64bit(8) /* FRA_TUN_ID */
+ nla_total_size(sizeof(struct fib_kuid_range));
+ nla_total_size(sizeof(struct fib_kuid_range))
+ nla_total_size(1); /* FRA_PROTOCOL */
if (ops->nlmsg_payload)
payload += ops->nlmsg_payload(rule);
@ -813,9 +817,12 @@ static int fib_nl_fill_rule(struct sk_buff *skb, struct fib_rule *rule,
if (nla_put_u32(skb, FRA_SUPPRESS_PREFIXLEN, rule->suppress_prefixlen))
goto nla_put_failure;
frh->res1 = 0;
frh->res2 = 0;
frh->action = rule->action;
frh->flags = rule->flags;
frh->proto = rule->proto;
if (nla_put_u8(skb, FRA_PROTOCOL, rule->proto))
goto nla_put_failure;
if (rule->action == FR_ACT_GOTO &&
rcu_access_pointer(rule->ctarget) == NULL)