504 lines
10 KiB
C
504 lines
10 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* SR-IPv6 implementation
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*
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* Author:
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* David Lebrun <david.lebrun@uclouvain.be>
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*/
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#include <linux/errno.h>
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#include <linux/types.h>
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#include <linux/socket.h>
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#include <linux/net.h>
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#include <linux/in6.h>
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#include <linux/slab.h>
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#include <linux/rhashtable.h>
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#include <net/ipv6.h>
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#include <net/protocol.h>
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#include <net/seg6.h>
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#include <net/genetlink.h>
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#include <linux/seg6.h>
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#include <linux/seg6_genl.h>
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#ifdef CONFIG_IPV6_SEG6_HMAC
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#include <net/seg6_hmac.h>
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#endif
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bool seg6_validate_srh(struct ipv6_sr_hdr *srh, int len, bool reduced)
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{
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unsigned int tlv_offset;
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int max_last_entry;
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int trailing;
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if (srh->type != IPV6_SRCRT_TYPE_4)
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return false;
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if (((srh->hdrlen + 1) << 3) != len)
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return false;
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if (!reduced && srh->segments_left > srh->first_segment) {
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return false;
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} else {
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max_last_entry = (srh->hdrlen / 2) - 1;
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if (srh->first_segment > max_last_entry)
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return false;
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if (srh->segments_left > srh->first_segment + 1)
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return false;
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}
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tlv_offset = sizeof(*srh) + ((srh->first_segment + 1) << 4);
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trailing = len - tlv_offset;
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if (trailing < 0)
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return false;
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while (trailing) {
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struct sr6_tlv *tlv;
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unsigned int tlv_len;
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if (trailing < sizeof(*tlv))
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return false;
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tlv = (struct sr6_tlv *)((unsigned char *)srh + tlv_offset);
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tlv_len = sizeof(*tlv) + tlv->len;
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trailing -= tlv_len;
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if (trailing < 0)
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return false;
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tlv_offset += tlv_len;
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}
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return true;
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}
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static struct genl_family seg6_genl_family;
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static const struct nla_policy seg6_genl_policy[SEG6_ATTR_MAX + 1] = {
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[SEG6_ATTR_DST] = { .type = NLA_BINARY,
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.len = sizeof(struct in6_addr) },
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[SEG6_ATTR_DSTLEN] = { .type = NLA_S32, },
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[SEG6_ATTR_HMACKEYID] = { .type = NLA_U32, },
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[SEG6_ATTR_SECRET] = { .type = NLA_BINARY, },
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[SEG6_ATTR_SECRETLEN] = { .type = NLA_U8, },
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[SEG6_ATTR_ALGID] = { .type = NLA_U8, },
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[SEG6_ATTR_HMACINFO] = { .type = NLA_NESTED, },
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};
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#ifdef CONFIG_IPV6_SEG6_HMAC
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static int seg6_genl_sethmac(struct sk_buff *skb, struct genl_info *info)
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{
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struct net *net = genl_info_net(info);
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struct seg6_pernet_data *sdata;
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struct seg6_hmac_info *hinfo;
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u32 hmackeyid;
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char *secret;
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int err = 0;
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u8 algid;
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u8 slen;
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sdata = seg6_pernet(net);
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if (!info->attrs[SEG6_ATTR_HMACKEYID] ||
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!info->attrs[SEG6_ATTR_SECRETLEN] ||
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!info->attrs[SEG6_ATTR_ALGID])
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return -EINVAL;
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hmackeyid = nla_get_u32(info->attrs[SEG6_ATTR_HMACKEYID]);
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slen = nla_get_u8(info->attrs[SEG6_ATTR_SECRETLEN]);
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algid = nla_get_u8(info->attrs[SEG6_ATTR_ALGID]);
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if (hmackeyid == 0)
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return -EINVAL;
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if (slen > SEG6_HMAC_SECRET_LEN)
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return -EINVAL;
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mutex_lock(&sdata->lock);
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hinfo = seg6_hmac_info_lookup(net, hmackeyid);
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if (!slen) {
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if (!hinfo)
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err = -ENOENT;
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err = seg6_hmac_info_del(net, hmackeyid);
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goto out_unlock;
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}
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if (!info->attrs[SEG6_ATTR_SECRET]) {
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err = -EINVAL;
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goto out_unlock;
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}
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if (hinfo) {
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err = seg6_hmac_info_del(net, hmackeyid);
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if (err)
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goto out_unlock;
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}
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secret = (char *)nla_data(info->attrs[SEG6_ATTR_SECRET]);
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hinfo = kzalloc(sizeof(*hinfo), GFP_KERNEL);
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if (!hinfo) {
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err = -ENOMEM;
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goto out_unlock;
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}
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memcpy(hinfo->secret, secret, slen);
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hinfo->slen = slen;
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hinfo->alg_id = algid;
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hinfo->hmackeyid = hmackeyid;
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err = seg6_hmac_info_add(net, hmackeyid, hinfo);
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if (err)
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kfree(hinfo);
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out_unlock:
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mutex_unlock(&sdata->lock);
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return err;
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}
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#else
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static int seg6_genl_sethmac(struct sk_buff *skb, struct genl_info *info)
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{
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return -ENOTSUPP;
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}
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#endif
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static int seg6_genl_set_tunsrc(struct sk_buff *skb, struct genl_info *info)
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{
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struct net *net = genl_info_net(info);
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struct in6_addr *val, *t_old, *t_new;
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struct seg6_pernet_data *sdata;
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sdata = seg6_pernet(net);
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if (!info->attrs[SEG6_ATTR_DST])
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return -EINVAL;
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val = nla_data(info->attrs[SEG6_ATTR_DST]);
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t_new = kmemdup(val, sizeof(*val), GFP_KERNEL);
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if (!t_new)
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return -ENOMEM;
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mutex_lock(&sdata->lock);
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t_old = sdata->tun_src;
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rcu_assign_pointer(sdata->tun_src, t_new);
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mutex_unlock(&sdata->lock);
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synchronize_net();
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kfree(t_old);
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return 0;
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}
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static int seg6_genl_get_tunsrc(struct sk_buff *skb, struct genl_info *info)
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{
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struct net *net = genl_info_net(info);
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struct in6_addr *tun_src;
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struct sk_buff *msg;
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void *hdr;
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msg = genlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
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if (!msg)
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return -ENOMEM;
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hdr = genlmsg_put(msg, info->snd_portid, info->snd_seq,
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&seg6_genl_family, 0, SEG6_CMD_GET_TUNSRC);
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if (!hdr)
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goto free_msg;
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rcu_read_lock();
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tun_src = rcu_dereference(seg6_pernet(net)->tun_src);
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if (nla_put(msg, SEG6_ATTR_DST, sizeof(struct in6_addr), tun_src))
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goto nla_put_failure;
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rcu_read_unlock();
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genlmsg_end(msg, hdr);
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return genlmsg_reply(msg, info);
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nla_put_failure:
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rcu_read_unlock();
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free_msg:
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nlmsg_free(msg);
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return -ENOMEM;
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}
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#ifdef CONFIG_IPV6_SEG6_HMAC
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static int __seg6_hmac_fill_info(struct seg6_hmac_info *hinfo,
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struct sk_buff *msg)
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{
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if (nla_put_u32(msg, SEG6_ATTR_HMACKEYID, hinfo->hmackeyid) ||
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nla_put_u8(msg, SEG6_ATTR_SECRETLEN, hinfo->slen) ||
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nla_put(msg, SEG6_ATTR_SECRET, hinfo->slen, hinfo->secret) ||
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nla_put_u8(msg, SEG6_ATTR_ALGID, hinfo->alg_id))
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return -1;
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return 0;
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}
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static int __seg6_genl_dumphmac_element(struct seg6_hmac_info *hinfo,
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u32 portid, u32 seq, u32 flags,
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struct sk_buff *skb, u8 cmd)
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{
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void *hdr;
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hdr = genlmsg_put(skb, portid, seq, &seg6_genl_family, flags, cmd);
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if (!hdr)
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return -ENOMEM;
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if (__seg6_hmac_fill_info(hinfo, skb) < 0)
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goto nla_put_failure;
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genlmsg_end(skb, hdr);
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return 0;
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nla_put_failure:
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genlmsg_cancel(skb, hdr);
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return -EMSGSIZE;
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}
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static int seg6_genl_dumphmac_start(struct netlink_callback *cb)
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{
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struct net *net = sock_net(cb->skb->sk);
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struct seg6_pernet_data *sdata;
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struct rhashtable_iter *iter;
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sdata = seg6_pernet(net);
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iter = (struct rhashtable_iter *)cb->args[0];
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if (!iter) {
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iter = kmalloc(sizeof(*iter), GFP_KERNEL);
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if (!iter)
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return -ENOMEM;
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cb->args[0] = (long)iter;
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}
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rhashtable_walk_enter(&sdata->hmac_infos, iter);
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return 0;
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}
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static int seg6_genl_dumphmac_done(struct netlink_callback *cb)
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{
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struct rhashtable_iter *iter = (struct rhashtable_iter *)cb->args[0];
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rhashtable_walk_exit(iter);
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kfree(iter);
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return 0;
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}
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static int seg6_genl_dumphmac(struct sk_buff *skb, struct netlink_callback *cb)
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{
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struct rhashtable_iter *iter = (struct rhashtable_iter *)cb->args[0];
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struct seg6_hmac_info *hinfo;
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int ret;
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rhashtable_walk_start(iter);
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for (;;) {
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hinfo = rhashtable_walk_next(iter);
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if (IS_ERR(hinfo)) {
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if (PTR_ERR(hinfo) == -EAGAIN)
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continue;
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ret = PTR_ERR(hinfo);
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goto done;
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} else if (!hinfo) {
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break;
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}
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ret = __seg6_genl_dumphmac_element(hinfo,
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NETLINK_CB(cb->skb).portid,
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cb->nlh->nlmsg_seq,
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NLM_F_MULTI,
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skb, SEG6_CMD_DUMPHMAC);
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if (ret)
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goto done;
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}
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ret = skb->len;
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done:
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rhashtable_walk_stop(iter);
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return ret;
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}
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#else
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static int seg6_genl_dumphmac_start(struct netlink_callback *cb)
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{
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return 0;
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}
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static int seg6_genl_dumphmac_done(struct netlink_callback *cb)
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{
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return 0;
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}
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static int seg6_genl_dumphmac(struct sk_buff *skb, struct netlink_callback *cb)
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{
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return -ENOTSUPP;
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}
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#endif
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static int __net_init seg6_net_init(struct net *net)
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{
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struct seg6_pernet_data *sdata;
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sdata = kzalloc(sizeof(*sdata), GFP_KERNEL);
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if (!sdata)
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return -ENOMEM;
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mutex_init(&sdata->lock);
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sdata->tun_src = kzalloc(sizeof(*sdata->tun_src), GFP_KERNEL);
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if (!sdata->tun_src) {
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kfree(sdata);
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return -ENOMEM;
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}
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net->ipv6.seg6_data = sdata;
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#ifdef CONFIG_IPV6_SEG6_HMAC
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seg6_hmac_net_init(net);
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#endif
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return 0;
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}
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static void __net_exit seg6_net_exit(struct net *net)
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{
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struct seg6_pernet_data *sdata = seg6_pernet(net);
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#ifdef CONFIG_IPV6_SEG6_HMAC
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seg6_hmac_net_exit(net);
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#endif
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kfree(sdata->tun_src);
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kfree(sdata);
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}
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static struct pernet_operations ip6_segments_ops = {
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.init = seg6_net_init,
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.exit = seg6_net_exit,
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};
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static const struct genl_ops seg6_genl_ops[] = {
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{
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.cmd = SEG6_CMD_SETHMAC,
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.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
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.doit = seg6_genl_sethmac,
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.flags = GENL_ADMIN_PERM,
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},
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{
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.cmd = SEG6_CMD_DUMPHMAC,
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.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
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.start = seg6_genl_dumphmac_start,
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.dumpit = seg6_genl_dumphmac,
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.done = seg6_genl_dumphmac_done,
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.flags = GENL_ADMIN_PERM,
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},
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{
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.cmd = SEG6_CMD_SET_TUNSRC,
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.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
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.doit = seg6_genl_set_tunsrc,
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.flags = GENL_ADMIN_PERM,
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},
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{
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.cmd = SEG6_CMD_GET_TUNSRC,
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.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
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.doit = seg6_genl_get_tunsrc,
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.flags = GENL_ADMIN_PERM,
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},
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};
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static struct genl_family seg6_genl_family __ro_after_init = {
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.hdrsize = 0,
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.name = SEG6_GENL_NAME,
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.version = SEG6_GENL_VERSION,
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.maxattr = SEG6_ATTR_MAX,
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.policy = seg6_genl_policy,
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.netnsok = true,
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.parallel_ops = true,
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.ops = seg6_genl_ops,
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.n_ops = ARRAY_SIZE(seg6_genl_ops),
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.module = THIS_MODULE,
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};
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int __init seg6_init(void)
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{
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int err;
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err = genl_register_family(&seg6_genl_family);
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if (err)
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goto out;
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err = register_pernet_subsys(&ip6_segments_ops);
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if (err)
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goto out_unregister_genl;
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#ifdef CONFIG_IPV6_SEG6_LWTUNNEL
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err = seg6_iptunnel_init();
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if (err)
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goto out_unregister_pernet;
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err = seg6_local_init();
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if (err)
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goto out_unregister_pernet;
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#endif
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#ifdef CONFIG_IPV6_SEG6_HMAC
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err = seg6_hmac_init();
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if (err)
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goto out_unregister_iptun;
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#endif
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pr_info("Segment Routing with IPv6\n");
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out:
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return err;
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#ifdef CONFIG_IPV6_SEG6_HMAC
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out_unregister_iptun:
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#ifdef CONFIG_IPV6_SEG6_LWTUNNEL
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seg6_local_exit();
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seg6_iptunnel_exit();
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#endif
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#endif
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#ifdef CONFIG_IPV6_SEG6_LWTUNNEL
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out_unregister_pernet:
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unregister_pernet_subsys(&ip6_segments_ops);
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#endif
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out_unregister_genl:
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genl_unregister_family(&seg6_genl_family);
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goto out;
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}
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void seg6_exit(void)
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{
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#ifdef CONFIG_IPV6_SEG6_HMAC
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seg6_hmac_exit();
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#endif
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#ifdef CONFIG_IPV6_SEG6_LWTUNNEL
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seg6_iptunnel_exit();
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#endif
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unregister_pernet_subsys(&ip6_segments_ops);
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genl_unregister_family(&seg6_genl_family);
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}
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