External/passt
1
0
Fork 0
mirror of https://passt.top/passt synced 2024-12-22 05:35:23 +00:00
Code Issues Packages Projects Releases Wiki Activity

ndp: Use struct assignment in preference to memcpy() for IPv6 addresses

Browse Source 
There are a number of places we can simply assign IPv6 addresses about,
rather than the current mildly ugly memcpy().

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
This commit is contained in:
David Gibson 2024-11-14 14:33:06 +11:00 committed by Stefano Brivio
parent cbc83e14df
commit 36c070e6e3
1 changed files with 6 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
ndp.c
View File

@ -158,7 +158,7 @@ struct ndp_ra {
unsigned char var[sizeof(struct opt_mtu) + sizeof(struct opt_rdnss) +
sizeof(struct opt_dnssl)];
} __attribute__((packed));
} __attribute__((packed, aligned(__alignof__(struct in6_addr))));
/**
* struct ndp_ns - NDP Neighbor Solicitation (NS) message
@ -168,7 +168,7 @@ struct ndp_ra {
struct ndp_ns {
struct icmp6hdr ih;
struct in6_addr target_addr;
} __attribute__((packed));
} __attribute__((packed, aligned(__alignof__(struct in6_addr))));
/**
* ndp_send() - Send an NDP message
@ -192,7 +192,7 @@ static void ndp_send(const struct ctx *c, const struct in6_addr *dst,
* @addr: IPv6 address to advertise
*/
static void ndp_na(const struct ctx *c, const struct in6_addr *dst,
const void *addr)
const struct in6_addr *addr)
{
struct ndp_na na = {
.ih = {
@ -202,6 +202,7 @@ static void ndp_na(const struct ctx *c, const struct in6_addr *dst,
.icmp6_solicited = 1,
.icmp6_override = 1,
},
.target_addr = *addr,
.target_l2_addr = {
.header = {
.type = OPT_TARGET_L2_ADDR,
@ -210,7 +211,6 @@ static void ndp_na(const struct ctx *c, const struct in6_addr *dst,
}
};
memcpy(&na.target_addr, addr, sizeof(na.target_addr));
memcpy(na.target_l2_addr.mac, c->our_tap_mac, ETH_ALEN);
ndp_send(c, dst, &na, sizeof(na));
@ -242,6 +242,7 @@ static void ndp_ra(const struct ctx *c, const struct in6_addr *dst)
.valid_lifetime = ~0U,
.pref_lifetime = ~0U,
},
.prefix = c->ip6.addr,
.source_ll = {
.header = {
.type = OPT_SRC_L2_ADDR,
@ -251,8 +252,6 @@ static void ndp_ra(const struct ctx *c, const struct in6_addr *dst)
};
unsigned char *ptr = NULL;
memcpy(&ra.prefix, &c->ip6.addr, sizeof(ra.prefix));
ptr = &ra.var[0];
if (c->mtu != -1) {
@ -282,8 +281,7 @@ static void ndp_ra(const struct ctx *c, const struct in6_addr *dst)
.lifetime = ~0U,
};
for (i = 0; i < n; i++) {
memcpy(&rdnss->dns[i], &c->ip6.dns[i],
sizeof(rdnss->dns[i]));
rdnss->dns[i] = c->ip6.dns[i];
}
ptr += offsetof(struct opt_rdnss, dns) +
i * sizeof(rdnss->dns[0]);