diff options
Diffstat (limited to 'net')
| -rw-r--r-- | net/ipv6/addrconf.c | 82 | ||||
| -rw-r--r-- | net/ipv6/ip6_output.c | 3 |
2 files changed, 84 insertions, 1 deletions
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c index 4f1d7d110302..81a067a2e526 100644 --- a/net/ipv6/addrconf.c +++ b/net/ipv6/addrconf.c @@ -239,6 +239,7 @@ static struct ipv6_devconf ipv6_devconf __read_mostly = { .ndisc_evict_nocarrier = 1, .ra_honor_pio_life = 0, .ra_honor_pio_pflag = 0, + .force_forwarding = 0, }; static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = { @@ -303,6 +304,7 @@ static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = { .ndisc_evict_nocarrier = 1, .ra_honor_pio_life = 0, .ra_honor_pio_pflag = 0, + .force_forwarding = 0, }; /* Check if link is ready: is it up and is a valid qdisc available */ @@ -857,6 +859,9 @@ static void addrconf_forward_change(struct net *net, __s32 newf) idev = __in6_dev_get_rtnl_net(dev); if (idev) { int changed = (!idev->cnf.forwarding) ^ (!newf); + /* Disabling all.forwarding sets 0 to force_forwarding for all interfaces */ + if (newf == 0) + WRITE_ONCE(idev->cnf.force_forwarding, 0); WRITE_ONCE(idev->cnf.forwarding, newf); if (changed) @@ -5710,6 +5715,7 @@ static void ipv6_store_devconf(const struct ipv6_devconf *cnf, array[DEVCONF_ACCEPT_UNTRACKED_NA] = READ_ONCE(cnf->accept_untracked_na); array[DEVCONF_ACCEPT_RA_MIN_LFT] = READ_ONCE(cnf->accept_ra_min_lft); + array[DEVCONF_FORCE_FORWARDING] = READ_ONCE(cnf->force_forwarding); } static inline size_t inet6_ifla6_size(void) @@ -6738,6 +6744,75 @@ static int addrconf_sysctl_disable_policy(const struct ctl_table *ctl, int write return ret; } +static void addrconf_force_forward_change(struct net *net, __s32 newf) +{ + struct net_device *dev; + struct inet6_dev *idev; + + for_each_netdev(net, dev) { + idev = __in6_dev_get_rtnl_net(dev); + if (idev) { + int changed = (!idev->cnf.force_forwarding) ^ (!newf); + + WRITE_ONCE(idev->cnf.force_forwarding, newf); + if (changed) + inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF, + NETCONFA_FORCE_FORWARDING, + dev->ifindex, &idev->cnf); + } + } +} + +static int addrconf_sysctl_force_forwarding(const struct ctl_table *ctl, int write, + void *buffer, size_t *lenp, loff_t *ppos) +{ + struct inet6_dev *idev = ctl->extra1; + struct ctl_table tmp_ctl = *ctl; + struct net *net = ctl->extra2; + int *valp = ctl->data; + int new_val = *valp; + int old_val = *valp; + loff_t pos = *ppos; + int ret; + + tmp_ctl.extra1 = SYSCTL_ZERO; + tmp_ctl.extra2 = SYSCTL_ONE; + tmp_ctl.data = &new_val; + + ret = proc_douintvec_minmax(&tmp_ctl, write, buffer, lenp, ppos); + + if (write && old_val != new_val) { + if (!rtnl_net_trylock(net)) + return restart_syscall(); + + WRITE_ONCE(*valp, new_val); + + if (valp == &net->ipv6.devconf_dflt->force_forwarding) { + inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, + NETCONFA_FORCE_FORWARDING, + NETCONFA_IFINDEX_DEFAULT, + net->ipv6.devconf_dflt); + } else if (valp == &net->ipv6.devconf_all->force_forwarding) { + inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, + NETCONFA_FORCE_FORWARDING, + NETCONFA_IFINDEX_ALL, + net->ipv6.devconf_all); + + addrconf_force_forward_change(net, new_val); + } else { + inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, + NETCONFA_FORCE_FORWARDING, + idev->dev->ifindex, + &idev->cnf); + } + rtnl_net_unlock(net); + } + + if (ret) + *ppos = pos; + return ret; +} + static int minus_one = -1; static const int two_five_five = 255; static u32 ioam6_if_id_max = U16_MAX; @@ -7208,6 +7283,13 @@ static const struct ctl_table addrconf_sysctl[] = { .extra1 = SYSCTL_ZERO, .extra2 = SYSCTL_TWO, }, + { + .procname = "force_forwarding", + .data = &ipv6_devconf.force_forwarding, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = addrconf_sysctl_force_forwarding, + }, }; static int __addrconf_sysctl_register(struct net *net, char *dev_name, diff --git a/net/ipv6/ip6_output.c b/net/ipv6/ip6_output.c index 0412f8544695..1e1410237b6e 100644 --- a/net/ipv6/ip6_output.c +++ b/net/ipv6/ip6_output.c @@ -511,7 +511,8 @@ int ip6_forward(struct sk_buff *skb) u32 mtu; idev = __in6_dev_get_safely(dev_get_by_index_rcu(net, IP6CB(skb)->iif)); - if (READ_ONCE(net->ipv6.devconf_all->forwarding) == 0) + if (!READ_ONCE(net->ipv6.devconf_all->forwarding) && + (!idev || !READ_ONCE(idev->cnf.force_forwarding))) goto error; if (skb->pkt_type != PACKET_HOST) |