diff options
Diffstat (limited to 'net/ipv4/sysctl_net_ipv4.c')
| -rw-r--r-- | net/ipv4/sysctl_net_ipv4.c | 89 |
1 files changed, 74 insertions, 15 deletions
diff --git a/net/ipv4/sysctl_net_ipv4.c b/net/ipv4/sysctl_net_ipv4.c index 1b5ce96707a3..63d4eccc674d 100644 --- a/net/ipv4/sysctl_net_ipv4.c +++ b/net/ipv4/sysctl_net_ipv4.c @@ -76,9 +76,9 @@ static int ipv4_local_port_range(ctl_table *table, int write, } -static void inet_get_ping_group_range_table(struct ctl_table *table, gid_t *low, gid_t *high) +static void inet_get_ping_group_range_table(struct ctl_table *table, kgid_t *low, kgid_t *high) { - gid_t *data = table->data; + kgid_t *data = table->data; unsigned int seq; do { seq = read_seqbegin(&sysctl_local_ports.lock); @@ -89,12 +89,12 @@ static void inet_get_ping_group_range_table(struct ctl_table *table, gid_t *low, } /* Update system visible IP port range */ -static void set_ping_group_range(struct ctl_table *table, gid_t range[2]) +static void set_ping_group_range(struct ctl_table *table, kgid_t low, kgid_t high) { - gid_t *data = table->data; + kgid_t *data = table->data; write_seqlock(&sysctl_local_ports.lock); - data[0] = range[0]; - data[1] = range[1]; + data[0] = low; + data[1] = high; write_sequnlock(&sysctl_local_ports.lock); } @@ -103,21 +103,33 @@ static int ipv4_ping_group_range(ctl_table *table, int write, void __user *buffer, size_t *lenp, loff_t *ppos) { + struct user_namespace *user_ns = current_user_ns(); int ret; - gid_t range[2]; + gid_t urange[2]; + kgid_t low, high; ctl_table tmp = { - .data = &range, - .maxlen = sizeof(range), + .data = &urange, + .maxlen = sizeof(urange), .mode = table->mode, .extra1 = &ip_ping_group_range_min, .extra2 = &ip_ping_group_range_max, }; - inet_get_ping_group_range_table(table, range, range + 1); + inet_get_ping_group_range_table(table, &low, &high); + urange[0] = from_kgid_munged(user_ns, low); + urange[1] = from_kgid_munged(user_ns, high); ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos); - if (write && ret == 0) - set_ping_group_range(table, range); + if (write && ret == 0) { + low = make_kgid(user_ns, urange[0]); + high = make_kgid(user_ns, urange[1]); + if (!gid_valid(low) || !gid_valid(high) || + (urange[1] < urange[0]) || gid_lt(high, low)) { + low = make_kgid(&init_user_ns, 1); + high = make_kgid(&init_user_ns, 0); + } + set_ping_group_range(table, low, high); + } return ret; } @@ -220,6 +232,47 @@ static int ipv4_tcp_mem(ctl_table *ctl, int write, return 0; } +int proc_tcp_fastopen_key(ctl_table *ctl, int write, void __user *buffer, + size_t *lenp, loff_t *ppos) +{ + ctl_table tbl = { .maxlen = (TCP_FASTOPEN_KEY_LENGTH * 2 + 10) }; + struct tcp_fastopen_context *ctxt; + int ret; + u32 user_key[4]; /* 16 bytes, matching TCP_FASTOPEN_KEY_LENGTH */ + + tbl.data = kmalloc(tbl.maxlen, GFP_KERNEL); + if (!tbl.data) + return -ENOMEM; + + rcu_read_lock(); + ctxt = rcu_dereference(tcp_fastopen_ctx); + if (ctxt) + memcpy(user_key, ctxt->key, TCP_FASTOPEN_KEY_LENGTH); + else + memset(user_key, 0, sizeof(user_key)); + rcu_read_unlock(); + + snprintf(tbl.data, tbl.maxlen, "%08x-%08x-%08x-%08x", + user_key[0], user_key[1], user_key[2], user_key[3]); + ret = proc_dostring(&tbl, write, buffer, lenp, ppos); + + if (write && ret == 0) { + if (sscanf(tbl.data, "%x-%x-%x-%x", user_key, user_key + 1, + user_key + 2, user_key + 3) != 4) { + ret = -EINVAL; + goto bad_key; + } + tcp_fastopen_reset_cipher(user_key, TCP_FASTOPEN_KEY_LENGTH); + } + +bad_key: + pr_debug("proc FO key set 0x%x-%x-%x-%x <- 0x%s: %u\n", + user_key[0], user_key[1], user_key[2], user_key[3], + (char *)tbl.data, ret); + kfree(tbl.data); + return ret; +} + static struct ctl_table ipv4_table[] = { { .procname = "tcp_timestamps", @@ -374,6 +427,12 @@ static struct ctl_table ipv4_table[] = { .proc_handler = proc_dointvec, }, { + .procname = "tcp_fastopen_key", + .mode = 0600, + .maxlen = ((TCP_FASTOPEN_KEY_LENGTH * 2) + 10), + .proc_handler = proc_tcp_fastopen_key, + }, + { .procname = "tcp_tw_recycle", .data = &tcp_death_row.sysctl_tw_recycle, .maxlen = sizeof(int), @@ -786,7 +845,7 @@ static struct ctl_table ipv4_net_table[] = { { .procname = "ping_group_range", .data = &init_net.ipv4.sysctl_ping_group_range, - .maxlen = sizeof(init_net.ipv4.sysctl_ping_group_range), + .maxlen = sizeof(gid_t)*2, .mode = 0644, .proc_handler = ipv4_ping_group_range, }, @@ -830,8 +889,8 @@ static __net_init int ipv4_sysctl_init_net(struct net *net) * Sane defaults - nobody may create ping sockets. * Boot scripts should set this to distro-specific group. */ - net->ipv4.sysctl_ping_group_range[0] = 1; - net->ipv4.sysctl_ping_group_range[1] = 0; + net->ipv4.sysctl_ping_group_range[0] = make_kgid(&init_user_ns, 1); + net->ipv4.sysctl_ping_group_range[1] = make_kgid(&init_user_ns, 0); tcp_init_mem(net); |
