diff options
Diffstat (limited to 'net/xfrm/xfrm_policy.c')
| -rw-r--r-- | net/xfrm/xfrm_policy.c | 231 |
1 files changed, 231 insertions, 0 deletions
diff --git a/net/xfrm/xfrm_policy.c b/net/xfrm/xfrm_policy.c index b7e537fe2d75..fa7ce060b454 100644 --- a/net/xfrm/xfrm_policy.c +++ b/net/xfrm/xfrm_policy.c @@ -2236,3 +2236,234 @@ void __init xfrm_init(void) xfrm_input_init(); } +#ifdef CONFIG_XFRM_MIGRATE +static int xfrm_migrate_selector_match(struct xfrm_selector *sel_cmp, + struct xfrm_selector *sel_tgt) +{ + if (sel_cmp->proto == IPSEC_ULPROTO_ANY) { + if (sel_tgt->family == sel_cmp->family && + xfrm_addr_cmp(&sel_tgt->daddr, &sel_cmp->daddr, + sel_cmp->family) == 0 && + xfrm_addr_cmp(&sel_tgt->saddr, &sel_cmp->saddr, + sel_cmp->family) == 0 && + sel_tgt->prefixlen_d == sel_cmp->prefixlen_d && + sel_tgt->prefixlen_s == sel_cmp->prefixlen_s) { + return 1; + } + } else { + if (memcmp(sel_tgt, sel_cmp, sizeof(*sel_tgt)) == 0) { + return 1; + } + } + return 0; +} + +static struct xfrm_policy * xfrm_migrate_policy_find(struct xfrm_selector *sel, + u8 dir, u8 type) +{ + struct xfrm_policy *pol, *ret = NULL; + struct hlist_node *entry; + struct hlist_head *chain; + u32 priority = ~0U; + + read_lock_bh(&xfrm_policy_lock); + chain = policy_hash_direct(&sel->daddr, &sel->saddr, sel->family, dir); + hlist_for_each_entry(pol, entry, chain, bydst) { + if (xfrm_migrate_selector_match(sel, &pol->selector) && + pol->type == type) { + ret = pol; + priority = ret->priority; + break; + } + } + chain = &xfrm_policy_inexact[dir]; + hlist_for_each_entry(pol, entry, chain, bydst) { + if (xfrm_migrate_selector_match(sel, &pol->selector) && + pol->type == type && + pol->priority < priority) { + ret = pol; + break; + } + } + + if (ret) + xfrm_pol_hold(ret); + + read_unlock_bh(&xfrm_policy_lock); + + return ret; +} + +static int migrate_tmpl_match(struct xfrm_migrate *m, struct xfrm_tmpl *t) +{ + int match = 0; + + if (t->mode == m->mode && t->id.proto == m->proto && + (m->reqid == 0 || t->reqid == m->reqid)) { + switch (t->mode) { + case XFRM_MODE_TUNNEL: + case XFRM_MODE_BEET: + if (xfrm_addr_cmp(&t->id.daddr, &m->old_daddr, + m->old_family) == 0 && + xfrm_addr_cmp(&t->saddr, &m->old_saddr, + m->old_family) == 0) { + match = 1; + } + break; + case XFRM_MODE_TRANSPORT: + /* in case of transport mode, template does not store + any IP addresses, hence we just compare mode and + protocol */ + match = 1; + break; + default: + break; + } + } + return match; +} + +/* update endpoint address(es) of template(s) */ +static int xfrm_policy_migrate(struct xfrm_policy *pol, + struct xfrm_migrate *m, int num_migrate) +{ + struct xfrm_migrate *mp; + struct dst_entry *dst; + int i, j, n = 0; + + write_lock_bh(&pol->lock); + if (unlikely(pol->dead)) { + /* target policy has been deleted */ + write_unlock_bh(&pol->lock); + return -ENOENT; + } + + for (i = 0; i < pol->xfrm_nr; i++) { + for (j = 0, mp = m; j < num_migrate; j++, mp++) { + if (!migrate_tmpl_match(mp, &pol->xfrm_vec[i])) + continue; + n++; + if (pol->xfrm_vec[i].mode != XFRM_MODE_TUNNEL) + continue; + /* update endpoints */ + memcpy(&pol->xfrm_vec[i].id.daddr, &mp->new_daddr, + sizeof(pol->xfrm_vec[i].id.daddr)); + memcpy(&pol->xfrm_vec[i].saddr, &mp->new_saddr, + sizeof(pol->xfrm_vec[i].saddr)); + pol->xfrm_vec[i].encap_family = mp->new_family; + /* flush bundles */ + while ((dst = pol->bundles) != NULL) { + pol->bundles = dst->next; + dst_free(dst); + } + } + } + + write_unlock_bh(&pol->lock); + + if (!n) + return -ENODATA; + + return 0; +} + +static int xfrm_migrate_check(struct xfrm_migrate *m, int num_migrate) +{ + int i, j; + + if (num_migrate < 1 || num_migrate > XFRM_MAX_DEPTH) + return -EINVAL; + + for (i = 0; i < num_migrate; i++) { + if ((xfrm_addr_cmp(&m[i].old_daddr, &m[i].new_daddr, + m[i].old_family) == 0) && + (xfrm_addr_cmp(&m[i].old_saddr, &m[i].new_saddr, + m[i].old_family) == 0)) + return -EINVAL; + if (xfrm_addr_any(&m[i].new_daddr, m[i].new_family) || + xfrm_addr_any(&m[i].new_saddr, m[i].new_family)) + return -EINVAL; + + /* check if there is any duplicated entry */ + for (j = i + 1; j < num_migrate; j++) { + if (!memcmp(&m[i].old_daddr, &m[j].old_daddr, + sizeof(m[i].old_daddr)) && + !memcmp(&m[i].old_saddr, &m[j].old_saddr, + sizeof(m[i].old_saddr)) && + m[i].proto == m[j].proto && + m[i].mode == m[j].mode && + m[i].reqid == m[j].reqid && + m[i].old_family == m[j].old_family) + return -EINVAL; + } + } + + return 0; +} + +int xfrm_migrate(struct xfrm_selector *sel, u8 dir, u8 type, + struct xfrm_migrate *m, int num_migrate) +{ + int i, err, nx_cur = 0, nx_new = 0; + struct xfrm_policy *pol = NULL; + struct xfrm_state *x, *xc; + struct xfrm_state *x_cur[XFRM_MAX_DEPTH]; + struct xfrm_state *x_new[XFRM_MAX_DEPTH]; + struct xfrm_migrate *mp; + + if ((err = xfrm_migrate_check(m, num_migrate)) < 0) + goto out; + + /* Stage 1 - find policy */ + if ((pol = xfrm_migrate_policy_find(sel, dir, type)) == NULL) { + err = -ENOENT; + goto out; + } + + /* Stage 2 - find and update state(s) */ + for (i = 0, mp = m; i < num_migrate; i++, mp++) { + if ((x = xfrm_migrate_state_find(mp))) { + x_cur[nx_cur] = x; + nx_cur++; + if ((xc = xfrm_state_migrate(x, mp))) { + x_new[nx_new] = xc; + nx_new++; + } else { + err = -ENODATA; + goto restore_state; + } + } + } + + /* Stage 3 - update policy */ + if ((err = xfrm_policy_migrate(pol, m, num_migrate)) < 0) + goto restore_state; + + /* Stage 4 - delete old state(s) */ + if (nx_cur) { + xfrm_states_put(x_cur, nx_cur); + xfrm_states_delete(x_cur, nx_cur); + } + + /* Stage 5 - announce */ + km_migrate(sel, dir, type, m, num_migrate); + + xfrm_pol_put(pol); + + return 0; +out: + return err; + +restore_state: + if (pol) + xfrm_pol_put(pol); + if (nx_cur) + xfrm_states_put(x_cur, nx_cur); + if (nx_new) + xfrm_states_delete(x_new, nx_new); + + return err; +} +EXPORT_SYMBOL(xfrm_migrate); +#endif + |