Skip to content

Commit

Permalink
ipmr, ip6mr: Unite dumproute flows
Browse files Browse the repository at this point in the history 
The various MFC entries are being held in the same kind of mr_tables
for both ipmr and ip6mr, and their traversal logic is identical.
Also, with the exception of the addresses [and other small tidbits]
the major bulk of the nla setting is identical.

Unite as much of the dumping as possible between the two.
Notice this requires creating an mr_table iterator for each, as the
for-each preprocessor macro can't be used by the common logic.

Signed-off-by: Yuval Mintz <yuvalm@mellanox.com>
Acked-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
  • Loading branch information
Yuval Mintz authored and David S. Miller committed Mar 1, 2018
1 parent 889cd83 commit 7b0db85
Show file tree
Hide file tree
Showing 4 changed files with 230 additions and 239 deletions.
29 changes: 29 additions & 0 deletions include/linux/mroute_base.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -170,6 +170,16 @@ void *mr_mfc_find_parent(struct mr_table *mrt,
void *mr_mfc_find_any_parent(struct mr_table *mrt, int vifi);
void *mr_mfc_find_any(struct mr_table *mrt, int vifi, void *hasharg);

int mr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb,
struct mr_mfc *c, struct rtmsg *rtm);
int mr_rtm_dumproute(struct sk_buff *skb, struct netlink_callback *cb,
struct mr_table *(*iter)(struct net *net,
struct mr_table *mrt),
int (*fill)(struct mr_table *mrt,
struct sk_buff *skb,
u32 portid, u32 seq, struct mr_mfc *c,
int cmd, int flags),
spinlock_t *lock);
#else
static inline void vif_device_init(struct vif_device *v,
struct net_device *dev,
Expand Down Expand Up @@ -207,6 +217,25 @@ static inline struct mr_mfc *mr_mfc_find_any(struct mr_table *mrt,
{
return NULL;
}

static inline int mr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb,
struct mr_mfc *c, struct rtmsg *rtm)
{
return -EINVAL;
}

static inline int
mr_rtm_dumproute(struct sk_buff *skb, struct netlink_callback *cb,
struct mr_table *(*iter)(struct net *net,
struct mr_table *mrt),
int (*fill)(struct mr_table *mrt,
struct sk_buff *skb,
u32 portid, u32 seq, struct mr_mfc *c,
int cmd, int flags),
spinlock_t *lock)
{
return -EINVAL;
}
#endif

static inline void *mr_mfc_find(struct mr_table *mrt, void *hasharg)
Expand Down
161 changes: 39 additions & 122 deletions net/ipv4/ipmr.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -105,8 +105,6 @@ static void ip_mr_forward(struct net *net, struct mr_table *mrt,
struct mfc_cache *cache, int local);
static int ipmr_cache_report(struct mr_table *mrt,
struct sk_buff *pkt, vifi_t vifi, int assert);
static int __ipmr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb,
struct mr_mfc *c, struct rtmsg *rtm);
static void mroute_netlink_event(struct mr_table *mrt, struct mfc_cache *mfc,
int cmd);
static void igmpmsg_netlink_event(struct mr_table *mrt, struct sk_buff *pkt);
Expand All @@ -117,6 +115,23 @@ static void ipmr_expire_process(struct timer_list *t);
#define ipmr_for_each_table(mrt, net) \
list_for_each_entry_rcu(mrt, &net->ipv4.mr_tables, list)

static struct mr_table *ipmr_mr_table_iter(struct net *net,
struct mr_table *mrt)
{
struct mr_table *ret;

if (!mrt)
ret = list_entry_rcu(net->ipv4.mr_tables.next,
struct mr_table, list);
else
ret = list_entry_rcu(mrt->list.next,
struct mr_table, list);

if (&ret->list == &net->ipv4.mr_tables)
return NULL;
return ret;
}

static struct mr_table *ipmr_get_table(struct net *net, u32 id)
{
struct mr_table *mrt;
Expand Down Expand Up @@ -284,6 +299,14 @@ EXPORT_SYMBOL(ipmr_rule_default);
#define ipmr_for_each_table(mrt, net) \
for (mrt = net->ipv4.mrt; mrt; mrt = NULL)

static struct mr_table *ipmr_mr_table_iter(struct net *net,
struct mr_table *mrt)
{
if (!mrt)
return net->ipv4.mrt;
return NULL;
}

static struct mr_table *ipmr_get_table(struct net *net, u32 id)
{
return net->ipv4.mrt;
Expand Down Expand Up @@ -1051,8 +1074,8 @@ static void ipmr_cache_resolve(struct net *net, struct mr_table *mrt,
struct nlmsghdr *nlh = skb_pull(skb,
sizeof(struct iphdr));

if (__ipmr_fill_mroute(mrt, skb, &c->_c,
nlmsg_data(nlh)) > 0) {
if (mr_fill_mroute(mrt, skb, &c->_c,
nlmsg_data(nlh)) > 0) {
nlh->nlmsg_len = skb_tail_pointer(skb) -
(u8 *)nlh;
} else {
Expand Down Expand Up @@ -2256,66 +2279,6 @@ static int pim_rcv(struct sk_buff *skb)
}
#endif

static int __ipmr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb,
struct mr_mfc *c, struct rtmsg *rtm)
{
struct rta_mfc_stats mfcs;
struct nlattr *mp_attr;
struct rtnexthop *nhp;
unsigned long lastuse;
int ct;

/* If cache is unresolved, don't try to parse IIF and OIF */
if (c->mfc_parent >= MAXVIFS) {
rtm->rtm_flags |= RTNH_F_UNRESOLVED;
return -ENOENT;
}

if (VIF_EXISTS(mrt, c->mfc_parent) &&
nla_put_u32(skb, RTA_IIF,
mrt->vif_table[c->mfc_parent].dev->ifindex) < 0)
return -EMSGSIZE;

if (c->mfc_flags & MFC_OFFLOAD)
rtm->rtm_flags |= RTNH_F_OFFLOAD;

if (!(mp_attr = nla_nest_start(skb, RTA_MULTIPATH)))
return -EMSGSIZE;

for (ct = c->mfc_un.res.minvif; ct < c->mfc_un.res.maxvif; ct++) {
if (VIF_EXISTS(mrt, ct) && c->mfc_un.res.ttls[ct] < 255) {
struct vif_device *vif;

if (!(nhp = nla_reserve_nohdr(skb, sizeof(*nhp)))) {
nla_nest_cancel(skb, mp_attr);
return -EMSGSIZE;
}

nhp->rtnh_flags = 0;
nhp->rtnh_hops = c->mfc_un.res.ttls[ct];
vif = &mrt->vif_table[ct];
nhp->rtnh_ifindex = vif->dev->ifindex;
nhp->rtnh_len = sizeof(*nhp);
}
}

nla_nest_end(skb, mp_attr);

lastuse = READ_ONCE(c->mfc_un.res.lastuse);
lastuse = time_after_eq(jiffies, lastuse) ? jiffies - lastuse : 0;

mfcs.mfcs_packets = c->mfc_un.res.pkt;
mfcs.mfcs_bytes = c->mfc_un.res.bytes;
mfcs.mfcs_wrong_if = c->mfc_un.res.wrong_if;
if (nla_put_64bit(skb, RTA_MFC_STATS, sizeof(mfcs), &mfcs, RTA_PAD) ||
nla_put_u64_64bit(skb, RTA_EXPIRES, jiffies_to_clock_t(lastuse),
RTA_PAD))
return -EMSGSIZE;

rtm->rtm_type = RTN_MULTICAST;
return 1;
}

int ipmr_get_route(struct net *net, struct sk_buff *skb,
__be32 saddr, __be32 daddr,
struct rtmsg *rtm, u32 portid)
Expand Down Expand Up @@ -2373,7 +2336,7 @@ int ipmr_get_route(struct net *net, struct sk_buff *skb,
}

read_lock(&mrt_lock);
err = __ipmr_fill_mroute(mrt, skb, &cache->_c, rtm);
err = mr_fill_mroute(mrt, skb, &cache->_c, rtm);
read_unlock(&mrt_lock);
rcu_read_unlock();
return err;
Expand Down Expand Up @@ -2410,7 +2373,7 @@ static int ipmr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb,
if (nla_put_in_addr(skb, RTA_SRC, c->mfc_origin) ||
nla_put_in_addr(skb, RTA_DST, c->mfc_mcastgrp))
goto nla_put_failure;
err = __ipmr_fill_mroute(mrt, skb, &c->_c, rtm);
err = mr_fill_mroute(mrt, skb, &c->_c, rtm);
/* do not break the dump if cache is unresolved */
if (err < 0 && err != -ENOENT)
goto nla_put_failure;
Expand All @@ -2423,6 +2386,14 @@ static int ipmr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb,
return -EMSGSIZE;
}

static int _ipmr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb,
u32 portid, u32 seq, struct mr_mfc *c, int cmd,
int flags)
{
return ipmr_fill_mroute(mrt, skb, portid, seq, (struct mfc_cache *)c,
cmd, flags);
}

static size_t mroute_msgsize(bool unresolved, int maxvif)
{
size_t len =
Expand Down Expand Up @@ -2596,62 +2567,8 @@ static int ipmr_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh,

static int ipmr_rtm_dumproute(struct sk_buff *skb, struct netlink_callback *cb)
{
struct net *net = sock_net(skb->sk);
unsigned int t = 0, s_t;
unsigned int e = 0, s_e;
struct mr_table *mrt;
struct mr_mfc *mfc;

s_t = cb->args[0];
s_e = cb->args[1];

rcu_read_lock();
ipmr_for_each_table(mrt, net) {
if (t < s_t)
goto next_table;
list_for_each_entry_rcu(mfc, &mrt->mfc_cache_list, list) {
if (e < s_e)
goto next_entry;
if (ipmr_fill_mroute(mrt, skb,
NETLINK_CB(cb->skb).portid,
cb->nlh->nlmsg_seq,
(struct mfc_cache *)mfc,
RTM_NEWROUTE, NLM_F_MULTI) < 0)
goto done;
next_entry:
e++;
}
e = 0;
s_e = 0;

spin_lock_bh(&mfc_unres_lock);
list_for_each_entry(mfc, &mrt->mfc_unres_queue, list) {
if (e < s_e)
goto next_entry2;
if (ipmr_fill_mroute(mrt, skb,
NETLINK_CB(cb->skb).portid,
cb->nlh->nlmsg_seq,
(struct mfc_cache *)mfc,
RTM_NEWROUTE, NLM_F_MULTI) < 0) {
spin_unlock_bh(&mfc_unres_lock);
goto done;
}
next_entry2:
e++;
}
spin_unlock_bh(&mfc_unres_lock);
e = 0;
s_e = 0;
next_table:
t++;
}
done:
rcu_read_unlock();

cb->args[1] = e;
cb->args[0] = t;

return skb->len;
return mr_rtm_dumproute(skb, cb, ipmr_mr_table_iter,
_ipmr_fill_mroute, &mfc_unres_lock);
}

static const struct nla_policy rtm_ipmr_policy[RTA_MAX + 1] = {
Expand Down
123 changes: 123 additions & 0 deletions net/ipv4/ipmr_base.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -198,3 +198,126 @@ void *mr_mfc_seq_next(struct seq_file *seq, void *v,
}
EXPORT_SYMBOL(mr_mfc_seq_next);
#endif

int mr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb,
struct mr_mfc *c, struct rtmsg *rtm)
{
struct rta_mfc_stats mfcs;
struct nlattr *mp_attr;
struct rtnexthop *nhp;
unsigned long lastuse;
int ct;

/* If cache is unresolved, don't try to parse IIF and OIF */
if (c->mfc_parent >= MAXVIFS) {
rtm->rtm_flags |= RTNH_F_UNRESOLVED;
return -ENOENT;
}

if (VIF_EXISTS(mrt, c->mfc_parent) &&
nla_put_u32(skb, RTA_IIF,
mrt->vif_table[c->mfc_parent].dev->ifindex) < 0)
return -EMSGSIZE;

if (c->mfc_flags & MFC_OFFLOAD)
rtm->rtm_flags |= RTNH_F_OFFLOAD;

mp_attr = nla_nest_start(skb, RTA_MULTIPATH);
if (!mp_attr)
return -EMSGSIZE;

for (ct = c->mfc_un.res.minvif; ct < c->mfc_un.res.maxvif; ct++) {
if (VIF_EXISTS(mrt, ct) && c->mfc_un.res.ttls[ct] < 255) {
struct vif_device *vif;

nhp = nla_reserve_nohdr(skb, sizeof(*nhp));
if (!nhp) {
nla_nest_cancel(skb, mp_attr);
return -EMSGSIZE;
}

nhp->rtnh_flags = 0;
nhp->rtnh_hops = c->mfc_un.res.ttls[ct];
vif = &mrt->vif_table[ct];
nhp->rtnh_ifindex = vif->dev->ifindex;
nhp->rtnh_len = sizeof(*nhp);
}
}

nla_nest_end(skb, mp_attr);

lastuse = READ_ONCE(c->mfc_un.res.lastuse);
lastuse = time_after_eq(jiffies, lastuse) ? jiffies - lastuse : 0;

mfcs.mfcs_packets = c->mfc_un.res.pkt;
mfcs.mfcs_bytes = c->mfc_un.res.bytes;
mfcs.mfcs_wrong_if = c->mfc_un.res.wrong_if;
if (nla_put_64bit(skb, RTA_MFC_STATS, sizeof(mfcs), &mfcs, RTA_PAD) ||
nla_put_u64_64bit(skb, RTA_EXPIRES, jiffies_to_clock_t(lastuse),
RTA_PAD))
return -EMSGSIZE;

rtm->rtm_type = RTN_MULTICAST;
return 1;
}
EXPORT_SYMBOL(mr_fill_mroute);

int mr_rtm_dumproute(struct sk_buff *skb, struct netlink_callback *cb,
struct mr_table *(*iter)(struct net *net,
struct mr_table *mrt),
int (*fill)(struct mr_table *mrt,
struct sk_buff *skb,
u32 portid, u32 seq, struct mr_mfc *c,
int cmd, int flags),
spinlock_t *lock)
{
unsigned int t = 0, e = 0, s_t = cb->args[0], s_e = cb->args[1];
struct net *net = sock_net(skb->sk);
struct mr_table *mrt;
struct mr_mfc *mfc;

rcu_read_lock();
for (mrt = iter(net, NULL); mrt; mrt = iter(net, mrt)) {
if (t < s_t)
goto next_table;
list_for_each_entry_rcu(mfc, &mrt->mfc_cache_list, list) {
if (e < s_e)
goto next_entry;
if (fill(mrt, skb, NETLINK_CB(cb->skb).portid,
cb->nlh->nlmsg_seq, mfc,
RTM_NEWROUTE, NLM_F_MULTI) < 0)
goto done;
next_entry:
e++;
}
e = 0;
s_e = 0;

spin_lock_bh(lock);
list_for_each_entry(mfc, &mrt->mfc_unres_queue, list) {
if (e < s_e)
goto next_entry2;
if (fill(mrt, skb, NETLINK_CB(cb->skb).portid,
cb->nlh->nlmsg_seq, mfc,
RTM_NEWROUTE, NLM_F_MULTI) < 0) {
spin_unlock_bh(lock);
goto done;
}
next_entry2:
e++;
}
spin_unlock_bh(lock);
e = 0;
s_e = 0;
next_table:
t++;
}
done:
rcu_read_unlock();

cb->args[1] = e;
cb->args[0] = t;

return skb->len;
}
EXPORT_SYMBOL(mr_rtm_dumproute);
Loading

0 comments on commit 7b0db85

Please sign in to comment.