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ipv4: Fix nexthop caching wrt. scoping.
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Move the scope value out of the fib alias entries and into fib_info,
so that we always use the correct scope when recomputing the nexthop
cached source address.

Reported-by: Julian Anastasov <ja@ssi.bg>
Signed-off-by: David S. Miller <davem@davemloft.net>
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David S. Miller committed Mar 25, 2011
1 parent 436c3b6 commit 37e826c
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Showing 4 changed files with 16 additions and 20 deletions.
6 changes: 3 additions & 3 deletions include/net/ip_fib.h
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Original file line number Diff line number Diff line change
Expand Up @@ -51,7 +51,6 @@ struct fib_nh {
struct fib_info *nh_parent;
unsigned nh_flags;
unsigned char nh_scope;
unsigned char nh_cfg_scope;
#ifdef CONFIG_IP_ROUTE_MULTIPATH
int nh_weight;
int nh_power;
Expand All @@ -75,9 +74,10 @@ struct fib_info {
struct net *fib_net;
int fib_treeref;
atomic_t fib_clntref;
int fib_dead;
unsigned fib_flags;
int fib_protocol;
unsigned char fib_dead;
unsigned char fib_protocol;
unsigned char fib_scope;
__be32 fib_prefsrc;
u32 fib_priority;
u32 *fib_metrics;
Expand Down
3 changes: 1 addition & 2 deletions net/ipv4/fib_lookup.h
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Original file line number Diff line number Diff line change
Expand Up @@ -10,7 +10,6 @@ struct fib_alias {
struct fib_info *fa_info;
u8 fa_tos;
u8 fa_type;
u8 fa_scope;
u8 fa_state;
struct rcu_head rcu;
};
Expand All @@ -29,7 +28,7 @@ extern void fib_release_info(struct fib_info *);
extern struct fib_info *fib_create_info(struct fib_config *cfg);
extern int fib_nh_match(struct fib_config *cfg, struct fib_info *fi);
extern int fib_dump_info(struct sk_buff *skb, u32 pid, u32 seq, int event,
u32 tb_id, u8 type, u8 scope, __be32 dst,
u32 tb_id, u8 type, __be32 dst,
int dst_len, u8 tos, struct fib_info *fi,
unsigned int);
extern void rtmsg_fib(int event, __be32 key, struct fib_alias *fa,
Expand Down
15 changes: 8 additions & 7 deletions net/ipv4/fib_semantics.c
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Original file line number Diff line number Diff line change
Expand Up @@ -222,7 +222,7 @@ static inline unsigned int fib_info_hashfn(const struct fib_info *fi)
unsigned int mask = (fib_info_hash_size - 1);
unsigned int val = fi->fib_nhs;

val ^= fi->fib_protocol;
val ^= (fi->fib_protocol << 8) | fi->fib_scope;
val ^= (__force u32)fi->fib_prefsrc;
val ^= fi->fib_priority;
for_nexthops(fi) {
Expand All @@ -248,6 +248,7 @@ static struct fib_info *fib_find_info(const struct fib_info *nfi)
if (fi->fib_nhs != nfi->fib_nhs)
continue;
if (nfi->fib_protocol == fi->fib_protocol &&
nfi->fib_scope == fi->fib_scope &&
nfi->fib_prefsrc == fi->fib_prefsrc &&
nfi->fib_priority == fi->fib_priority &&
memcmp(nfi->fib_metrics, fi->fib_metrics,
Expand Down Expand Up @@ -328,7 +329,7 @@ void rtmsg_fib(int event, __be32 key, struct fib_alias *fa,
goto errout;

err = fib_dump_info(skb, info->pid, seq, event, tb_id,
fa->fa_type, fa->fa_scope, key, dst_len,
fa->fa_type, key, dst_len,
fa->fa_tos, fa->fa_info, nlm_flags);
if (err < 0) {
/* -EMSGSIZE implies BUG in fib_nlmsg_size() */
Expand Down Expand Up @@ -699,7 +700,7 @@ __be32 fib_info_update_nh_saddr(struct net *net, struct fib_nh *nh)
{
nh->nh_saddr = inet_select_addr(nh->nh_dev,
nh->nh_gw,
nh->nh_cfg_scope);
nh->nh_parent->fib_scope);
nh->nh_saddr_genid = atomic_read(&net->ipv4.dev_addr_genid);

return nh->nh_saddr;
Expand Down Expand Up @@ -763,6 +764,7 @@ struct fib_info *fib_create_info(struct fib_config *cfg)

fi->fib_net = hold_net(net);
fi->fib_protocol = cfg->fc_protocol;
fi->fib_scope = cfg->fc_scope;
fi->fib_flags = cfg->fc_flags;
fi->fib_priority = cfg->fc_priority;
fi->fib_prefsrc = cfg->fc_prefsrc;
Expand Down Expand Up @@ -864,7 +866,6 @@ struct fib_info *fib_create_info(struct fib_config *cfg)
}

change_nexthops(fi) {
nexthop_nh->nh_cfg_scope = cfg->fc_scope;
fib_info_update_nh_saddr(net, nexthop_nh);
} endfor_nexthops(fi)

Expand Down Expand Up @@ -914,7 +915,7 @@ struct fib_info *fib_create_info(struct fib_config *cfg)
}

int fib_dump_info(struct sk_buff *skb, u32 pid, u32 seq, int event,
u32 tb_id, u8 type, u8 scope, __be32 dst, int dst_len, u8 tos,
u32 tb_id, u8 type, __be32 dst, int dst_len, u8 tos,
struct fib_info *fi, unsigned int flags)
{
struct nlmsghdr *nlh;
Expand All @@ -936,7 +937,7 @@ int fib_dump_info(struct sk_buff *skb, u32 pid, u32 seq, int event,
NLA_PUT_U32(skb, RTA_TABLE, tb_id);
rtm->rtm_type = type;
rtm->rtm_flags = fi->fib_flags;
rtm->rtm_scope = scope;
rtm->rtm_scope = fi->fib_scope;
rtm->rtm_protocol = fi->fib_protocol;

if (rtm->rtm_dst_len)
Expand Down Expand Up @@ -1092,7 +1093,7 @@ void fib_select_default(struct fib_result *res)
list_for_each_entry_rcu(fa, fa_head, fa_list) {
struct fib_info *next_fi = fa->fa_info;

if (fa->fa_scope != res->scope ||
if (next_fi->fib_scope != res->scope ||
fa->fa_type != RTN_UNICAST)
continue;

Expand Down
12 changes: 4 additions & 8 deletions net/ipv4/fib_trie.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -1245,7 +1245,6 @@ int fib_table_insert(struct fib_table *tb, struct fib_config *cfg)
if (fa->fa_info->fib_priority != fi->fib_priority)
break;
if (fa->fa_type == cfg->fc_type &&
fa->fa_scope == cfg->fc_scope &&
fa->fa_info == fi) {
fa_match = fa;
break;
Expand All @@ -1271,7 +1270,6 @@ int fib_table_insert(struct fib_table *tb, struct fib_config *cfg)
new_fa->fa_tos = fa->fa_tos;
new_fa->fa_info = fi;
new_fa->fa_type = cfg->fc_type;
new_fa->fa_scope = cfg->fc_scope;
state = fa->fa_state;
new_fa->fa_state = state & ~FA_S_ACCESSED;

Expand Down Expand Up @@ -1308,7 +1306,6 @@ int fib_table_insert(struct fib_table *tb, struct fib_config *cfg)
new_fa->fa_info = fi;
new_fa->fa_tos = tos;
new_fa->fa_type = cfg->fc_type;
new_fa->fa_scope = cfg->fc_scope;
new_fa->fa_state = 0;
/*
* Insert new entry to the list.
Expand Down Expand Up @@ -1362,7 +1359,7 @@ static int check_leaf(struct fib_table *tb, struct trie *t, struct leaf *l,

if (fa->fa_tos && fa->fa_tos != flp->flowi4_tos)
continue;
if (fa->fa_scope < flp->flowi4_scope)
if (fa->fa_info->fib_scope < flp->flowi4_scope)
continue;
fib_alias_accessed(fa);
err = fib_props[fa->fa_type].error;
Expand All @@ -1388,7 +1385,7 @@ static int check_leaf(struct fib_table *tb, struct trie *t, struct leaf *l,
res->prefixlen = plen;
res->nh_sel = nhsel;
res->type = fa->fa_type;
res->scope = fa->fa_scope;
res->scope = fa->fa_info->fib_scope;
res->fi = fi;
res->table = tb;
res->fa_head = &li->falh;
Expand Down Expand Up @@ -1664,7 +1661,7 @@ int fib_table_delete(struct fib_table *tb, struct fib_config *cfg)

if ((!cfg->fc_type || fa->fa_type == cfg->fc_type) &&
(cfg->fc_scope == RT_SCOPE_NOWHERE ||
fa->fa_scope == cfg->fc_scope) &&
fa->fa_info->fib_scope == cfg->fc_scope) &&
(!cfg->fc_prefsrc ||
fi->fib_prefsrc == cfg->fc_prefsrc) &&
(!cfg->fc_protocol ||
Expand Down Expand Up @@ -1863,7 +1860,6 @@ static int fn_trie_dump_fa(t_key key, int plen, struct list_head *fah,
RTM_NEWROUTE,
tb->tb_id,
fa->fa_type,
fa->fa_scope,
xkey,
plen,
fa->fa_tos,
Expand Down Expand Up @@ -2384,7 +2380,7 @@ static int fib_trie_seq_show(struct seq_file *seq, void *v)
seq_indent(seq, iter->depth+1);
seq_printf(seq, " /%d %s %s", li->plen,
rtn_scope(buf1, sizeof(buf1),
fa->fa_scope),
fa->fa_info->fib_scope),
rtn_type(buf2, sizeof(buf2),
fa->fa_type));
if (fa->fa_tos)
Expand Down

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